FreeBSD/Linux Kernel Cross Reference
sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License (the "License").
      * You may not use this file except in compliance with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      * or http://www.opensolaris.org/os/licensing.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    
    /*
     * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
     * Use is subject to license terms.
     */
    
    /*
     * Copyright (c) 2013, Joyent, Inc. All rights reserved.
     * Copyright (c) 2013 by Delphix. All rights reserved.
     */
    
    #ifndef _SYS_DTRACE_H
    #define _SYS_DTRACE_H
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    /*
     * DTrace Dynamic Tracing Software: Kernel Interfaces
     *
     * Note: The contents of this file are private to the implementation of the
     * Solaris system and DTrace subsystem and are subject to change at any time
     * without notice.  Applications and drivers using these interfaces will fail
     * to run on future releases.  These interfaces should not be used for any
     * purpose except those expressly outlined in dtrace(7D) and libdtrace(3LIB).
     * Please refer to the "Solaris Dynamic Tracing Guide" for more information.
     */
    
    #ifndef _ASM
    
    #include <sys/param.h>
    #include <sys/stdint.h>
    #ifdef _KERNEL
    #include <sys/endian.h>
    #endif
    #if !defined(IN_BASE) && !defined(_KERNEL)
    /* Compatibility types to allow including the CTF API */
    typedef unsigned int zoneid_t;
    typedef unsigned char uchar_t;
    typedef unsigned short ushort_t;
    typedef unsigned int uint_t;
    typedef unsigned long ulong_t;
    typedef int processorid_t;
    #else
    #include <sys/modctl.h>
    #include <sys/processor.h>
    #include <sys/cpuvar.h>
    #include <sys/param.h>
    #include <sys/linker.h>
    #include <sys/ioccom.h>
    #include <sys/cred.h>
    #include <sys/proc.h>
    #include <sys/types.h>
    #include <sys/ucred.h>
    #endif
    typedef int model_t;
    #include <sys/ctf_api.h>
    
    /*
     * DTrace Universal Constants and Typedefs
     */
    #define DTRACE_CPUALL           -1      /* all CPUs */
    #define DTRACE_IDNONE           0       /* invalid probe identifier */
    #define DTRACE_EPIDNONE         0       /* invalid enabled probe identifier */
    #define DTRACE_AGGIDNONE        0       /* invalid aggregation identifier */
    #define DTRACE_AGGVARIDNONE     0       /* invalid aggregation variable ID */
    #define DTRACE_CACHEIDNONE      0       /* invalid predicate cache */
    #define DTRACE_PROVNONE         0       /* invalid provider identifier */
    #define DTRACE_METAPROVNONE     0       /* invalid meta-provider identifier */
    #define DTRACE_ARGNONE          -1      /* invalid argument index */
    
    #define DTRACE_PROVNAMELEN      64
    #define DTRACE_MODNAMELEN       64
    #define DTRACE_FUNCNAMELEN      192
    #define DTRACE_NAMELEN          64
    #define DTRACE_FULLNAMELEN      (DTRACE_PROVNAMELEN + DTRACE_MODNAMELEN + \
                                    DTRACE_FUNCNAMELEN + DTRACE_NAMELEN + 4)
    #define DTRACE_ARGTYPELEN       128
   
   typedef uint32_t dtrace_id_t;           /* probe identifier */
   typedef uint32_t dtrace_epid_t;         /* enabled probe identifier */
   typedef uint32_t dtrace_aggid_t;        /* aggregation identifier */
   typedef int64_t dtrace_aggvarid_t;      /* aggregation variable identifier */
   typedef uint16_t dtrace_actkind_t;      /* action kind */
   typedef int64_t dtrace_optval_t;        /* option value */
   typedef uint32_t dtrace_cacheid_t;      /* predicate cache identifier */
   
   typedef enum dtrace_probespec {
           DTRACE_PROBESPEC_NONE = -1,
           DTRACE_PROBESPEC_PROVIDER = 0,
           DTRACE_PROBESPEC_MOD,
           DTRACE_PROBESPEC_FUNC,
           DTRACE_PROBESPEC_NAME
   } dtrace_probespec_t;
   
   /*
    * DTrace Intermediate Format (DIF)
    *
    * The following definitions describe the DTrace Intermediate Format (DIF), a
    * a RISC-like instruction set and program encoding used to represent
    * predicates and actions that can be bound to DTrace probes.  The constants
    * below defining the number of available registers are suggested minimums; the
    * compiler should use DTRACEIOC_CONF to dynamically obtain the number of
    * registers provided by the current DTrace implementation.
    */
   #define DIF_VERSION_1   1               /* DIF version 1: Solaris 10 Beta */
   #define DIF_VERSION_2   2               /* DIF version 2: Solaris 10 FCS */
   #define DIF_VERSION     DIF_VERSION_2   /* latest DIF instruction set version */
   #define DIF_DIR_NREGS   8               /* number of DIF integer registers */
   #define DIF_DTR_NREGS   8               /* number of DIF tuple registers */
   
   #define DIF_OP_OR       1               /* or   r1, r2, rd */
   #define DIF_OP_XOR      2               /* xor  r1, r2, rd */
   #define DIF_OP_AND      3               /* and  r1, r2, rd */
   #define DIF_OP_SLL      4               /* sll  r1, r2, rd */
   #define DIF_OP_SRL      5               /* srl  r1, r2, rd */
   #define DIF_OP_SUB      6               /* sub  r1, r2, rd */
   #define DIF_OP_ADD      7               /* add  r1, r2, rd */
   #define DIF_OP_MUL      8               /* mul  r1, r2, rd */
   #define DIF_OP_SDIV     9               /* sdiv r1, r2, rd */
   #define DIF_OP_UDIV     10              /* udiv r1, r2, rd */
   #define DIF_OP_SREM     11              /* srem r1, r2, rd */
   #define DIF_OP_UREM     12              /* urem r1, r2, rd */
   #define DIF_OP_NOT      13              /* not  r1, rd */
   #define DIF_OP_MOV      14              /* mov  r1, rd */
   #define DIF_OP_CMP      15              /* cmp  r1, r2 */
   #define DIF_OP_TST      16              /* tst  r1 */
   #define DIF_OP_BA       17              /* ba   label */
   #define DIF_OP_BE       18              /* be   label */
   #define DIF_OP_BNE      19              /* bne  label */
   #define DIF_OP_BG       20              /* bg   label */
   #define DIF_OP_BGU      21              /* bgu  label */
   #define DIF_OP_BGE      22              /* bge  label */
   #define DIF_OP_BGEU     23              /* bgeu label */
   #define DIF_OP_BL       24              /* bl   label */
   #define DIF_OP_BLU      25              /* blu  label */
   #define DIF_OP_BLE      26              /* ble  label */
   #define DIF_OP_BLEU     27              /* bleu label */
   #define DIF_OP_LDSB     28              /* ldsb [r1], rd */
   #define DIF_OP_LDSH     29              /* ldsh [r1], rd */
   #define DIF_OP_LDSW     30              /* ldsw [r1], rd */
   #define DIF_OP_LDUB     31              /* ldub [r1], rd */
   #define DIF_OP_LDUH     32              /* lduh [r1], rd */
   #define DIF_OP_LDUW     33              /* lduw [r1], rd */
   #define DIF_OP_LDX      34              /* ldx  [r1], rd */
   #define DIF_OP_RET      35              /* ret  rd */
   #define DIF_OP_NOP      36              /* nop */
   #define DIF_OP_SETX     37              /* setx intindex, rd */
   #define DIF_OP_SETS     38              /* sets strindex, rd */
   #define DIF_OP_SCMP     39              /* scmp r1, r2 */
   #define DIF_OP_LDGA     40              /* ldga var, ri, rd */
   #define DIF_OP_LDGS     41              /* ldgs var, rd */
   #define DIF_OP_STGS     42              /* stgs var, rs */
   #define DIF_OP_LDTA     43              /* ldta var, ri, rd */
   #define DIF_OP_LDTS     44              /* ldts var, rd */
   #define DIF_OP_STTS     45              /* stts var, rs */
   #define DIF_OP_SRA      46              /* sra  r1, r2, rd */
   #define DIF_OP_CALL     47              /* call subr, rd */
   #define DIF_OP_PUSHTR   48              /* pushtr type, rs, rr */
   #define DIF_OP_PUSHTV   49              /* pushtv type, rs, rv */
   #define DIF_OP_POPTS    50              /* popts */
   #define DIF_OP_FLUSHTS  51              /* flushts */
   #define DIF_OP_LDGAA    52              /* ldgaa var, rd */
   #define DIF_OP_LDTAA    53              /* ldtaa var, rd */
   #define DIF_OP_STGAA    54              /* stgaa var, rs */
   #define DIF_OP_STTAA    55              /* sttaa var, rs */
   #define DIF_OP_LDLS     56              /* ldls var, rd */
   #define DIF_OP_STLS     57              /* stls var, rs */
   #define DIF_OP_ALLOCS   58              /* allocs r1, rd */
   #define DIF_OP_COPYS    59              /* copys  r1, r2, rd */
   #define DIF_OP_STB      60              /* stb  r1, [rd] */
   #define DIF_OP_STH      61              /* sth  r1, [rd] */
   #define DIF_OP_STW      62              /* stw  r1, [rd] */
   #define DIF_OP_STX      63              /* stx  r1, [rd] */
   #define DIF_OP_ULDSB    64              /* uldsb [r1], rd */
   #define DIF_OP_ULDSH    65              /* uldsh [r1], rd */
   #define DIF_OP_ULDSW    66              /* uldsw [r1], rd */
   #define DIF_OP_ULDUB    67              /* uldub [r1], rd */
   #define DIF_OP_ULDUH    68              /* ulduh [r1], rd */
   #define DIF_OP_ULDUW    69              /* ulduw [r1], rd */
   #define DIF_OP_ULDX     70              /* uldx  [r1], rd */
   #define DIF_OP_RLDSB    71              /* rldsb [r1], rd */
   #define DIF_OP_RLDSH    72              /* rldsh [r1], rd */
   #define DIF_OP_RLDSW    73              /* rldsw [r1], rd */
   #define DIF_OP_RLDUB    74              /* rldub [r1], rd */
   #define DIF_OP_RLDUH    75              /* rlduh [r1], rd */
   #define DIF_OP_RLDUW    76              /* rlduw [r1], rd */
   #define DIF_OP_RLDX     77              /* rldx  [r1], rd */
   #define DIF_OP_XLATE    78              /* xlate xlrindex, rd */
   #define DIF_OP_XLARG    79              /* xlarg xlrindex, rd */
   
   #define DIF_INTOFF_MAX          0xffff  /* highest integer table offset */
   #define DIF_STROFF_MAX          0xffff  /* highest string table offset */
   #define DIF_REGISTER_MAX        0xff    /* highest register number */
   #define DIF_VARIABLE_MAX        0xffff  /* highest variable identifier */
   #define DIF_SUBROUTINE_MAX      0xffff  /* highest subroutine code */
   
   #define DIF_VAR_ARRAY_MIN       0x0000  /* lowest numbered array variable */
   #define DIF_VAR_ARRAY_UBASE     0x0080  /* lowest user-defined array */
   #define DIF_VAR_ARRAY_MAX       0x00ff  /* highest numbered array variable */
   
   #define DIF_VAR_OTHER_MIN       0x0100  /* lowest numbered scalar or assc */
   #define DIF_VAR_OTHER_UBASE     0x0500  /* lowest user-defined scalar or assc */
   #define DIF_VAR_OTHER_MAX       0xffff  /* highest numbered scalar or assc */
   
   #define DIF_VAR_ARGS            0x0000  /* arguments array */
   #define DIF_VAR_REGS            0x0001  /* registers array */
   #define DIF_VAR_UREGS           0x0002  /* user registers array */
   #define DIF_VAR_CURTHREAD       0x0100  /* thread pointer */
   #define DIF_VAR_TIMESTAMP       0x0101  /* timestamp */
   #define DIF_VAR_VTIMESTAMP      0x0102  /* virtual timestamp */
   #define DIF_VAR_IPL             0x0103  /* interrupt priority level */
   #define DIF_VAR_EPID            0x0104  /* enabled probe ID */
   #define DIF_VAR_ID              0x0105  /* probe ID */
   #define DIF_VAR_ARG0            0x0106  /* first argument */
   #define DIF_VAR_ARG1            0x0107  /* second argument */
   #define DIF_VAR_ARG2            0x0108  /* third argument */
   #define DIF_VAR_ARG3            0x0109  /* fourth argument */
   #define DIF_VAR_ARG4            0x010a  /* fifth argument */
   #define DIF_VAR_ARG5            0x010b  /* sixth argument */
   #define DIF_VAR_ARG6            0x010c  /* seventh argument */
   #define DIF_VAR_ARG7            0x010d  /* eighth argument */
   #define DIF_VAR_ARG8            0x010e  /* ninth argument */
   #define DIF_VAR_ARG9            0x010f  /* tenth argument */
   #define DIF_VAR_STACKDEPTH      0x0110  /* stack depth */
   #define DIF_VAR_CALLER          0x0111  /* caller */
   #define DIF_VAR_PROBEPROV       0x0112  /* probe provider */
   #define DIF_VAR_PROBEMOD        0x0113  /* probe module */
   #define DIF_VAR_PROBEFUNC       0x0114  /* probe function */
   #define DIF_VAR_PROBENAME       0x0115  /* probe name */
   #define DIF_VAR_PID             0x0116  /* process ID */
   #define DIF_VAR_TID             0x0117  /* (per-process) thread ID */
   #define DIF_VAR_EXECNAME        0x0118  /* name of executable */
   #define DIF_VAR_ZONENAME        0x0119  /* zone name associated with process */
   #define DIF_VAR_WALLTIMESTAMP   0x011a  /* wall-clock timestamp */
   #define DIF_VAR_USTACKDEPTH     0x011b  /* user-land stack depth */
   #define DIF_VAR_UCALLER         0x011c  /* user-level caller */
   #define DIF_VAR_PPID            0x011d  /* parent process ID */
   #define DIF_VAR_UID             0x011e  /* process user ID */
   #define DIF_VAR_GID             0x011f  /* process group ID */
   #define DIF_VAR_ERRNO           0x0120  /* thread errno */
   #define DIF_VAR_EXECARGS        0x0121  /* process arguments */
   #define DIF_VAR_JID             0x0122  /* process jail id */
   #define DIF_VAR_JAILNAME        0x0123  /* process jail name */
   
   #ifndef illumos
   #define DIF_VAR_CPU             0x0200
   #endif
   
   #define DIF_SUBR_RAND                   0
   #define DIF_SUBR_MUTEX_OWNED            1
   #define DIF_SUBR_MUTEX_OWNER            2
   #define DIF_SUBR_MUTEX_TYPE_ADAPTIVE    3
   #define DIF_SUBR_MUTEX_TYPE_SPIN        4
   #define DIF_SUBR_RW_READ_HELD           5
   #define DIF_SUBR_RW_WRITE_HELD          6
   #define DIF_SUBR_RW_ISWRITER            7
   #define DIF_SUBR_COPYIN                 8
   #define DIF_SUBR_COPYINSTR              9
   #define DIF_SUBR_SPECULATION            10
   #define DIF_SUBR_PROGENYOF              11
   #define DIF_SUBR_STRLEN                 12
   #define DIF_SUBR_COPYOUT                13
   #define DIF_SUBR_COPYOUTSTR             14
   #define DIF_SUBR_ALLOCA                 15
   #define DIF_SUBR_BCOPY                  16
   #define DIF_SUBR_COPYINTO               17
   #define DIF_SUBR_MSGDSIZE               18
   #define DIF_SUBR_MSGSIZE                19
   #define DIF_SUBR_GETMAJOR               20
   #define DIF_SUBR_GETMINOR               21
   #define DIF_SUBR_DDI_PATHNAME           22
   #define DIF_SUBR_STRJOIN                23
   #define DIF_SUBR_LLTOSTR                24
   #define DIF_SUBR_BASENAME               25
   #define DIF_SUBR_DIRNAME                26
   #define DIF_SUBR_CLEANPATH              27
   #define DIF_SUBR_STRCHR                 28
   #define DIF_SUBR_STRRCHR                29
   #define DIF_SUBR_STRSTR                 30
   #define DIF_SUBR_STRTOK                 31
   #define DIF_SUBR_SUBSTR                 32
   #define DIF_SUBR_INDEX                  33
   #define DIF_SUBR_RINDEX                 34
   #define DIF_SUBR_HTONS                  35
   #define DIF_SUBR_HTONL                  36
   #define DIF_SUBR_HTONLL                 37
   #define DIF_SUBR_NTOHS                  38
   #define DIF_SUBR_NTOHL                  39
   #define DIF_SUBR_NTOHLL                 40
   #define DIF_SUBR_INET_NTOP              41
   #define DIF_SUBR_INET_NTOA              42
   #define DIF_SUBR_INET_NTOA6             43
   #define DIF_SUBR_TOUPPER                44
   #define DIF_SUBR_TOLOWER                45
   #define DIF_SUBR_MEMREF                 46
   #define DIF_SUBR_SX_SHARED_HELD         47
   #define DIF_SUBR_SX_EXCLUSIVE_HELD      48
   #define DIF_SUBR_SX_ISEXCLUSIVE         49
   #define DIF_SUBR_MEMSTR                 50
   #define DIF_SUBR_GETF                   51
   #define DIF_SUBR_JSON                   52
   #define DIF_SUBR_STRTOLL                53
   #define DIF_SUBR_MAX                    53      /* max subroutine value */
   
   typedef uint32_t dif_instr_t;
   
   #define DIF_INSTR_OP(i)                 (((i) >> 24) & 0xff)
   #define DIF_INSTR_R1(i)                 (((i) >> 16) & 0xff)
   #define DIF_INSTR_R2(i)                 (((i) >>  8) & 0xff)
   #define DIF_INSTR_RD(i)                 ((i) & 0xff)
   #define DIF_INSTR_RS(i)                 ((i) & 0xff)
   #define DIF_INSTR_LABEL(i)              ((i) & 0xffffff)
   #define DIF_INSTR_VAR(i)                (((i) >>  8) & 0xffff)
   #define DIF_INSTR_INTEGER(i)            (((i) >>  8) & 0xffff)
   #define DIF_INSTR_STRING(i)             (((i) >>  8) & 0xffff)
   #define DIF_INSTR_SUBR(i)               (((i) >>  8) & 0xffff)
   #define DIF_INSTR_TYPE(i)               (((i) >> 16) & 0xff)
   #define DIF_INSTR_XLREF(i)              (((i) >>  8) & 0xffff)
   
   #define DIF_INSTR_FMT(op, r1, r2, d) \
           (((op) << 24) | ((r1) << 16) | ((r2) << 8) | (d))
   
   #define DIF_INSTR_NOT(r1, d)            (DIF_INSTR_FMT(DIF_OP_NOT, r1, 0, d))
   #define DIF_INSTR_MOV(r1, d)            (DIF_INSTR_FMT(DIF_OP_MOV, r1, 0, d))
   #define DIF_INSTR_CMP(op, r1, r2)       (DIF_INSTR_FMT(op, r1, r2, 0))
   #define DIF_INSTR_TST(r1)               (DIF_INSTR_FMT(DIF_OP_TST, r1, 0, 0))
   #define DIF_INSTR_BRANCH(op, label)     (((op) << 24) | (label))
   #define DIF_INSTR_LOAD(op, r1, d)       (DIF_INSTR_FMT(op, r1, 0, d))
   #define DIF_INSTR_STORE(op, r1, d)      (DIF_INSTR_FMT(op, r1, 0, d))
   #define DIF_INSTR_SETX(i, d)            ((DIF_OP_SETX << 24) | ((i) << 8) | (d))
   #define DIF_INSTR_SETS(s, d)            ((DIF_OP_SETS << 24) | ((s) << 8) | (d))
   #define DIF_INSTR_RET(d)                (DIF_INSTR_FMT(DIF_OP_RET, 0, 0, d))
   #define DIF_INSTR_NOP                   (DIF_OP_NOP << 24)
   #define DIF_INSTR_LDA(op, v, r, d)      (DIF_INSTR_FMT(op, v, r, d))
   #define DIF_INSTR_LDV(op, v, d)         (((op) << 24) | ((v) << 8) | (d))
   #define DIF_INSTR_STV(op, v, rs)        (((op) << 24) | ((v) << 8) | (rs))
   #define DIF_INSTR_CALL(s, d)            ((DIF_OP_CALL << 24) | ((s) << 8) | (d))
   #define DIF_INSTR_PUSHTS(op, t, r2, rs) (DIF_INSTR_FMT(op, t, r2, rs))
   #define DIF_INSTR_POPTS                 (DIF_OP_POPTS << 24)
   #define DIF_INSTR_FLUSHTS               (DIF_OP_FLUSHTS << 24)
   #define DIF_INSTR_ALLOCS(r1, d)         (DIF_INSTR_FMT(DIF_OP_ALLOCS, r1, 0, d))
   #define DIF_INSTR_COPYS(r1, r2, d)      (DIF_INSTR_FMT(DIF_OP_COPYS, r1, r2, d))
   #define DIF_INSTR_XLATE(op, r, d)       (((op) << 24) | ((r) << 8) | (d))
   
   #define DIF_REG_R0      0               /* %r0 is always set to zero */
   
   /*
    * A DTrace Intermediate Format Type (DIF Type) is used to represent the types
    * of variables, function and associative array arguments, and the return type
    * for each DIF object (shown below).  It contains a description of the type,
    * its size in bytes, and a module identifier.
    */
   typedef struct dtrace_diftype {
           uint8_t dtdt_kind;              /* type kind (see below) */
           uint8_t dtdt_ckind;             /* type kind in CTF */
           uint8_t dtdt_flags;             /* type flags (see below) */
           uint8_t dtdt_pad;               /* reserved for future use */
           uint32_t dtdt_size;             /* type size in bytes (unless string) */
   } dtrace_diftype_t;
   
   #define DIF_TYPE_CTF            0       /* type is a CTF type */
   #define DIF_TYPE_STRING         1       /* type is a D string */
   
   #define DIF_TF_BYREF            0x1     /* type is passed by reference */
   #define DIF_TF_BYUREF           0x2     /* user type is passed by reference */
   
   /*
    * A DTrace Intermediate Format variable record is used to describe each of the
    * variables referenced by a given DIF object.  It contains an integer variable
    * identifier along with variable scope and properties, as shown below.  The
    * size of this structure must be sizeof (int) aligned.
    */
   typedef struct dtrace_difv {
           uint32_t dtdv_name;             /* variable name index in dtdo_strtab */
           uint32_t dtdv_id;               /* variable reference identifier */
           uint8_t dtdv_kind;              /* variable kind (see below) */
           uint8_t dtdv_scope;             /* variable scope (see below) */
           uint16_t dtdv_flags;            /* variable flags (see below) */
           dtrace_diftype_t dtdv_type;     /* variable type (see above) */
   } dtrace_difv_t;
   
   #define DIFV_KIND_ARRAY         0       /* variable is an array of quantities */
   #define DIFV_KIND_SCALAR        1       /* variable is a scalar quantity */
   
   #define DIFV_SCOPE_GLOBAL       0       /* variable has global scope */
   #define DIFV_SCOPE_THREAD       1       /* variable has thread scope */
   #define DIFV_SCOPE_LOCAL        2       /* variable has local scope */
   
   #define DIFV_F_REF              0x1     /* variable is referenced by DIFO */
   #define DIFV_F_MOD              0x2     /* variable is written by DIFO */
   
   /*
    * DTrace Actions
    *
    * The upper byte determines the class of the action; the low bytes determines
    * the specific action within that class.  The classes of actions are as
    * follows:
    *
    *   [ no class ]                  <= May record process- or kernel-related data
    *   DTRACEACT_PROC                <= Only records process-related data
    *   DTRACEACT_PROC_DESTRUCTIVE    <= Potentially destructive to processes
    *   DTRACEACT_KERNEL              <= Only records kernel-related data
    *   DTRACEACT_KERNEL_DESTRUCTIVE  <= Potentially destructive to the kernel
    *   DTRACEACT_SPECULATIVE         <= Speculation-related action
    *   DTRACEACT_AGGREGATION         <= Aggregating action
    */
   #define DTRACEACT_NONE                  0       /* no action */
   #define DTRACEACT_DIFEXPR               1       /* action is DIF expression */
   #define DTRACEACT_EXIT                  2       /* exit() action */
   #define DTRACEACT_PRINTF                3       /* printf() action */
   #define DTRACEACT_PRINTA                4       /* printa() action */
   #define DTRACEACT_LIBACT                5       /* library-controlled action */
   #define DTRACEACT_TRACEMEM              6       /* tracemem() action */
   #define DTRACEACT_TRACEMEM_DYNSIZE      7       /* dynamic tracemem() size */
   #define DTRACEACT_PRINTM                8       /* printm() action (BSD) */
   
   #define DTRACEACT_PROC                  0x0100
   #define DTRACEACT_USTACK                (DTRACEACT_PROC + 1)
   #define DTRACEACT_JSTACK                (DTRACEACT_PROC + 2)
   #define DTRACEACT_USYM                  (DTRACEACT_PROC + 3)
   #define DTRACEACT_UMOD                  (DTRACEACT_PROC + 4)
   #define DTRACEACT_UADDR                 (DTRACEACT_PROC + 5)
   
   #define DTRACEACT_PROC_DESTRUCTIVE      0x0200
   #define DTRACEACT_STOP                  (DTRACEACT_PROC_DESTRUCTIVE + 1)
   #define DTRACEACT_RAISE                 (DTRACEACT_PROC_DESTRUCTIVE + 2)
   #define DTRACEACT_SYSTEM                (DTRACEACT_PROC_DESTRUCTIVE + 3)
   #define DTRACEACT_FREOPEN               (DTRACEACT_PROC_DESTRUCTIVE + 4)
   
   #define DTRACEACT_PROC_CONTROL          0x0300
   
   #define DTRACEACT_KERNEL                0x0400
   #define DTRACEACT_STACK                 (DTRACEACT_KERNEL + 1)
   #define DTRACEACT_SYM                   (DTRACEACT_KERNEL + 2)
   #define DTRACEACT_MOD                   (DTRACEACT_KERNEL + 3)
   
   #define DTRACEACT_KERNEL_DESTRUCTIVE    0x0500
   #define DTRACEACT_BREAKPOINT            (DTRACEACT_KERNEL_DESTRUCTIVE + 1)
   #define DTRACEACT_PANIC                 (DTRACEACT_KERNEL_DESTRUCTIVE + 2)
   #define DTRACEACT_CHILL                 (DTRACEACT_KERNEL_DESTRUCTIVE + 3)
   
   #define DTRACEACT_SPECULATIVE           0x0600
   #define DTRACEACT_SPECULATE             (DTRACEACT_SPECULATIVE + 1)
   #define DTRACEACT_COMMIT                (DTRACEACT_SPECULATIVE + 2)
   #define DTRACEACT_DISCARD               (DTRACEACT_SPECULATIVE + 3)
   
   #define DTRACEACT_CLASS(x)              ((x) & 0xff00)
   
   #define DTRACEACT_ISDESTRUCTIVE(x)      \
           (DTRACEACT_CLASS(x) == DTRACEACT_PROC_DESTRUCTIVE || \
           DTRACEACT_CLASS(x) == DTRACEACT_KERNEL_DESTRUCTIVE)
   
   #define DTRACEACT_ISSPECULATIVE(x)      \
           (DTRACEACT_CLASS(x) == DTRACEACT_SPECULATIVE)
   
   #define DTRACEACT_ISPRINTFLIKE(x)       \
           ((x) == DTRACEACT_PRINTF || (x) == DTRACEACT_PRINTA || \
           (x) == DTRACEACT_SYSTEM || (x) == DTRACEACT_FREOPEN)
   
   /*
    * DTrace Aggregating Actions
    *
    * These are functions f(x) for which the following is true:
    *
    *    f(f(x_0) U f(x_1) U ... U f(x_n)) = f(x_0 U x_1 U ... U x_n)
    *
    * where x_n is a set of arbitrary data.  Aggregating actions are in their own
    * DTrace action class, DTTRACEACT_AGGREGATION.  The macros provided here allow
    * for easier processing of the aggregation argument and data payload for a few
    * aggregating actions (notably:  quantize(), lquantize(), and ustack()).
    */
   #define DTRACEACT_AGGREGATION           0x0700
   #define DTRACEAGG_COUNT                 (DTRACEACT_AGGREGATION + 1)
   #define DTRACEAGG_MIN                   (DTRACEACT_AGGREGATION + 2)
   #define DTRACEAGG_MAX                   (DTRACEACT_AGGREGATION + 3)
   #define DTRACEAGG_AVG                   (DTRACEACT_AGGREGATION + 4)
   #define DTRACEAGG_SUM                   (DTRACEACT_AGGREGATION + 5)
   #define DTRACEAGG_STDDEV                (DTRACEACT_AGGREGATION + 6)
   #define DTRACEAGG_QUANTIZE              (DTRACEACT_AGGREGATION + 7)
   #define DTRACEAGG_LQUANTIZE             (DTRACEACT_AGGREGATION + 8)
   #define DTRACEAGG_LLQUANTIZE            (DTRACEACT_AGGREGATION + 9)
   
   #define DTRACEACT_ISAGG(x)              \
           (DTRACEACT_CLASS(x) == DTRACEACT_AGGREGATION)
   
   #define DTRACE_QUANTIZE_NBUCKETS        \
           (((sizeof (uint64_t) * NBBY) - 1) * 2 + 1)
   
   #define DTRACE_QUANTIZE_ZEROBUCKET      ((sizeof (uint64_t) * NBBY) - 1)
   
   #define DTRACE_QUANTIZE_BUCKETVAL(buck)                                 \
           (int64_t)((buck) < DTRACE_QUANTIZE_ZEROBUCKET ?                 \
           -(1LL << (DTRACE_QUANTIZE_ZEROBUCKET - 1 - (buck))) :           \
           (buck) == DTRACE_QUANTIZE_ZEROBUCKET ? 0 :                      \
           1LL << ((buck) - DTRACE_QUANTIZE_ZEROBUCKET - 1))
   
   #define DTRACE_LQUANTIZE_STEPSHIFT              48
   #define DTRACE_LQUANTIZE_STEPMASK               ((uint64_t)UINT16_MAX << 48)
   #define DTRACE_LQUANTIZE_LEVELSHIFT             32
   #define DTRACE_LQUANTIZE_LEVELMASK              ((uint64_t)UINT16_MAX << 32)
   #define DTRACE_LQUANTIZE_BASESHIFT              0
   #define DTRACE_LQUANTIZE_BASEMASK               UINT32_MAX
   
   #define DTRACE_LQUANTIZE_STEP(x)                \
           (uint16_t)(((x) & DTRACE_LQUANTIZE_STEPMASK) >> \
           DTRACE_LQUANTIZE_STEPSHIFT)
   
   #define DTRACE_LQUANTIZE_LEVELS(x)              \
           (uint16_t)(((x) & DTRACE_LQUANTIZE_LEVELMASK) >> \
           DTRACE_LQUANTIZE_LEVELSHIFT)
   
   #define DTRACE_LQUANTIZE_BASE(x)                \
           (int32_t)(((x) & DTRACE_LQUANTIZE_BASEMASK) >> \
           DTRACE_LQUANTIZE_BASESHIFT)
   
   #define DTRACE_LLQUANTIZE_FACTORSHIFT           48
   #define DTRACE_LLQUANTIZE_FACTORMASK            ((uint64_t)UINT16_MAX << 48)
   #define DTRACE_LLQUANTIZE_LOWSHIFT              32
   #define DTRACE_LLQUANTIZE_LOWMASK               ((uint64_t)UINT16_MAX << 32)
   #define DTRACE_LLQUANTIZE_HIGHSHIFT             16
   #define DTRACE_LLQUANTIZE_HIGHMASK              ((uint64_t)UINT16_MAX << 16)
   #define DTRACE_LLQUANTIZE_NSTEPSHIFT            0
   #define DTRACE_LLQUANTIZE_NSTEPMASK             UINT16_MAX
   
   #define DTRACE_LLQUANTIZE_FACTOR(x)             \
           (uint16_t)(((x) & DTRACE_LLQUANTIZE_FACTORMASK) >> \
           DTRACE_LLQUANTIZE_FACTORSHIFT)
   
   #define DTRACE_LLQUANTIZE_LOW(x)                \
           (uint16_t)(((x) & DTRACE_LLQUANTIZE_LOWMASK) >> \
           DTRACE_LLQUANTIZE_LOWSHIFT)
   
   #define DTRACE_LLQUANTIZE_HIGH(x)               \
           (uint16_t)(((x) & DTRACE_LLQUANTIZE_HIGHMASK) >> \
           DTRACE_LLQUANTIZE_HIGHSHIFT)
   
   #define DTRACE_LLQUANTIZE_NSTEP(x)              \
           (uint16_t)(((x) & DTRACE_LLQUANTIZE_NSTEPMASK) >> \
           DTRACE_LLQUANTIZE_NSTEPSHIFT)
   
   #define DTRACE_USTACK_NFRAMES(x)        (uint32_t)((x) & UINT32_MAX)
   #define DTRACE_USTACK_STRSIZE(x)        (uint32_t)((x) >> 32)
   #define DTRACE_USTACK_ARG(x, y)         \
           ((((uint64_t)(y)) << 32) | ((x) & UINT32_MAX))
   
   #ifndef _LP64
   #if BYTE_ORDER == _BIG_ENDIAN
   #define DTRACE_PTR(type, name)  uint32_t name##pad; type *name
   #else
   #define DTRACE_PTR(type, name)  type *name; uint32_t name##pad
   #endif
   #else
   #define DTRACE_PTR(type, name)  type *name
   #endif
   
   /*
    * DTrace Object Format (DOF)
    *
    * DTrace programs can be persistently encoded in the DOF format so that they
    * may be embedded in other programs (for example, in an ELF file) or in the
    * dtrace driver configuration file for use in anonymous tracing.  The DOF
    * format is versioned and extensible so that it can be revised and so that
    * internal data structures can be modified or extended compatibly.  All DOF
    * structures use fixed-size types, so the 32-bit and 64-bit representations
    * are identical and consumers can use either data model transparently.
    *
    * The file layout is structured as follows:
    *
    * +---------------+-------------------+----- ... ----+---- ... ------+
    * |   dof_hdr_t   |  dof_sec_t[ ... ] |   loadable   | non-loadable  |
    * | (file header) | (section headers) | section data | section data  |
    * +---------------+-------------------+----- ... ----+---- ... ------+
    * |<------------ dof_hdr.dofh_loadsz --------------->|               |
    * |<------------ dof_hdr.dofh_filesz ------------------------------->|
    *
    * The file header stores meta-data including a magic number, data model for
    * the instrumentation, data encoding, and properties of the DIF code within.
    * The header describes its own size and the size of the section headers.  By
    * convention, an array of section headers follows the file header, and then
    * the data for all loadable sections and unloadable sections.  This permits
    * consumer code to easily download the headers and all loadable data into the
    * DTrace driver in one contiguous chunk, omitting other extraneous sections.
    *
    * The section headers describe the size, offset, alignment, and section type
    * for each section.  Sections are described using a set of #defines that tell
    * the consumer what kind of data is expected.  Sections can contain links to
    * other sections by storing a dof_secidx_t, an index into the section header
    * array, inside of the section data structures.  The section header includes
    * an entry size so that sections with data arrays can grow their structures.
    *
    * The DOF data itself can contain many snippets of DIF (i.e. >1 DIFOs), which
    * are represented themselves as a collection of related DOF sections.  This
    * permits us to change the set of sections associated with a DIFO over time,
    * and also permits us to encode DIFOs that contain different sets of sections.
    * When a DOF section wants to refer to a DIFO, it stores the dof_secidx_t of a
    * section of type DOF_SECT_DIFOHDR.  This section's data is then an array of
    * dof_secidx_t's which in turn denote the sections associated with this DIFO.
    *
    * This loose coupling of the file structure (header and sections) to the
    * structure of the DTrace program itself (ECB descriptions, action
    * descriptions, and DIFOs) permits activities such as relocation processing
    * to occur in a single pass without having to understand D program structure.
    *
    * Finally, strings are always stored in ELF-style string tables along with a
    * string table section index and string table offset.  Therefore strings in
    * DOF are always arbitrary-length and not bound to the current implementation.
    */
   
   #define DOF_ID_SIZE     16      /* total size of dofh_ident[] in bytes */
   
   typedef struct dof_hdr {
           uint8_t dofh_ident[DOF_ID_SIZE]; /* identification bytes (see below) */
           uint32_t dofh_flags;            /* file attribute flags (if any) */
           uint32_t dofh_hdrsize;          /* size of file header in bytes */
           uint32_t dofh_secsize;          /* size of section header in bytes */
           uint32_t dofh_secnum;           /* number of section headers */
           uint64_t dofh_secoff;           /* file offset of section headers */
           uint64_t dofh_loadsz;           /* file size of loadable portion */
           uint64_t dofh_filesz;           /* file size of entire DOF file */
           uint64_t dofh_pad;              /* reserved for future use */
   } dof_hdr_t;
   
   #define DOF_ID_MAG0     0       /* first byte of magic number */
   #define DOF_ID_MAG1     1       /* second byte of magic number */
   #define DOF_ID_MAG2     2       /* third byte of magic number */
   #define DOF_ID_MAG3     3       /* fourth byte of magic number */
   #define DOF_ID_MODEL    4       /* DOF data model (see below) */
   #define DOF_ID_ENCODING 5       /* DOF data encoding (see below) */
   #define DOF_ID_VERSION  6       /* DOF file format major version (see below) */
   #define DOF_ID_DIFVERS  7       /* DIF instruction set version */
   #define DOF_ID_DIFIREG  8       /* DIF integer registers used by compiler */
   #define DOF_ID_DIFTREG  9       /* DIF tuple registers used by compiler */
   #define DOF_ID_PAD      10      /* start of padding bytes (all zeroes) */
   
   #define DOF_MAG_MAG0    0x7F    /* DOF_ID_MAG[0-3] */
   #define DOF_MAG_MAG1    'D'
   #define DOF_MAG_MAG2    'O'
   #define DOF_MAG_MAG3    'F'
   
   #define DOF_MAG_STRING  "\177DOF"
   #define DOF_MAG_STRLEN  4
   
   #define DOF_MODEL_NONE  0       /* DOF_ID_MODEL */
   #define DOF_MODEL_ILP32 1
   #define DOF_MODEL_LP64  2
   
   #ifdef _LP64
   #define DOF_MODEL_NATIVE        DOF_MODEL_LP64
   #else
   #define DOF_MODEL_NATIVE        DOF_MODEL_ILP32
   #endif
   
   #define DOF_ENCODE_NONE 0       /* DOF_ID_ENCODING */
   #define DOF_ENCODE_LSB  1
   #define DOF_ENCODE_MSB  2
   
   #if BYTE_ORDER == _BIG_ENDIAN
   #define DOF_ENCODE_NATIVE       DOF_ENCODE_MSB
   #else
   #define DOF_ENCODE_NATIVE       DOF_ENCODE_LSB
   #endif
   
   #define DOF_VERSION_1   1       /* DOF version 1: Solaris 10 FCS */
   #define DOF_VERSION_2   2       /* DOF version 2: Solaris Express 6/06 */
   #define DOF_VERSION     DOF_VERSION_2   /* Latest DOF version */
   
   #define DOF_FL_VALID    0       /* mask of all valid dofh_flags bits */
   
   typedef uint32_t dof_secidx_t;  /* section header table index type */
   typedef uint32_t dof_stridx_t;  /* string table index type */
   
   #define DOF_SECIDX_NONE (-1U)   /* null value for section indices */
   #define DOF_STRIDX_NONE (-1U)   /* null value for string indices */
   
   typedef struct dof_sec {
           uint32_t dofs_type;     /* section type (see below) */
           uint32_t dofs_align;    /* section data memory alignment */
           uint32_t dofs_flags;    /* section flags (if any) */
           uint32_t dofs_entsize;  /* size of section entry (if table) */
           uint64_t dofs_offset;   /* offset of section data within file */
           uint64_t dofs_size;     /* size of section data in bytes */
   } dof_sec_t;
   
   #define DOF_SECT_NONE           0       /* null section */
   #define DOF_SECT_COMMENTS       1       /* compiler comments */
   #define DOF_SECT_SOURCE         2       /* D program source code */
   #define DOF_SECT_ECBDESC        3       /* dof_ecbdesc_t */
   #define DOF_SECT_PROBEDESC      4       /* dof_probedesc_t */
   #define DOF_SECT_ACTDESC        5       /* dof_actdesc_t array */
   #define DOF_SECT_DIFOHDR        6       /* dof_difohdr_t (variable length) */
   #define DOF_SECT_DIF            7       /* uint32_t array of byte code */
   #define DOF_SECT_STRTAB         8       /* string table */
   #define DOF_SECT_VARTAB         9       /* dtrace_difv_t array */
   #define DOF_SECT_RELTAB         10      /* dof_relodesc_t array */
   #define DOF_SECT_TYPTAB         11      /* dtrace_diftype_t array */
   #define DOF_SECT_URELHDR        12      /* dof_relohdr_t (user relocations) */
   #define DOF_SECT_KRELHDR        13      /* dof_relohdr_t (kernel relocations) */
   #define DOF_SECT_OPTDESC        14      /* dof_optdesc_t array */
   #define DOF_SECT_PROVIDER       15      /* dof_provider_t */
   #define DOF_SECT_PROBES         16      /* dof_probe_t array */
   #define DOF_SECT_PRARGS         17      /* uint8_t array (probe arg mappings) */
   #define DOF_SECT_PROFFS         18      /* uint32_t array (probe arg offsets) */
   #define DOF_SECT_INTTAB         19      /* uint64_t array */
   #define DOF_SECT_UTSNAME        20      /* struct utsname */
   #define DOF_SECT_XLTAB          21      /* dof_xlref_t array */
   #define DOF_SECT_XLMEMBERS      22      /* dof_xlmember_t array */
   #define DOF_SECT_XLIMPORT       23      /* dof_xlator_t */
   #define DOF_SECT_XLEXPORT       24      /* dof_xlator_t */
   #define DOF_SECT_PREXPORT       25      /* dof_secidx_t array (exported objs) */
   #define DOF_SECT_PRENOFFS       26      /* uint32_t array (enabled offsets) */
   
   #define DOF_SECF_LOAD           1       /* section should be loaded */
   
   #define DOF_SEC_ISLOADABLE(x)                                           \
           (((x) == DOF_SECT_ECBDESC) || ((x) == DOF_SECT_PROBEDESC) ||    \
           ((x) == DOF_SECT_ACTDESC) || ((x) == DOF_SECT_DIFOHDR) ||       \
           ((x) == DOF_SECT_DIF) || ((x) == DOF_SECT_STRTAB) ||            \
           ((x) == DOF_SECT_VARTAB) || ((x) == DOF_SECT_RELTAB) ||         \
           ((x) == DOF_SECT_TYPTAB) || ((x) == DOF_SECT_URELHDR) ||        \
           ((x) == DOF_SECT_KRELHDR) || ((x) == DOF_SECT_OPTDESC) ||       \
           ((x) == DOF_SECT_PROVIDER) || ((x) == DOF_SECT_PROBES) ||       \
           ((x) == DOF_SECT_PRARGS) || ((x) == DOF_SECT_PROFFS) ||         \
           ((x) == DOF_SECT_INTTAB) || ((x) == DOF_SECT_XLTAB) ||          \
           ((x) == DOF_SECT_XLMEMBERS) || ((x) == DOF_SECT_XLIMPORT) ||    \
           ((x) == DOF_SECT_XLEXPORT) ||  ((x) == DOF_SECT_PREXPORT) ||    \
           ((x) == DOF_SECT_PRENOFFS))
   
   typedef struct dof_ecbdesc {
           dof_secidx_t dofe_probes;       /* link to DOF_SECT_PROBEDESC */
           dof_secidx_t dofe_pred;         /* link to DOF_SECT_DIFOHDR */
           dof_secidx_t dofe_actions;      /* link to DOF_SECT_ACTDESC */
           uint32_t dofe_pad;              /* reserved for future use */
           uint64_t dofe_uarg;             /* user-supplied library argument */
   } dof_ecbdesc_t;
   
   typedef struct dof_probedesc {
           dof_secidx_t dofp_strtab;       /* link to DOF_SECT_STRTAB section */
           dof_stridx_t dofp_provider;     /* provider string */
           dof_stridx_t dofp_mod;          /* module string */
           dof_stridx_t dofp_func;         /* function string */
           dof_stridx_t dofp_name;         /* name string */
           uint32_t dofp_id;               /* probe identifier (or zero) */
   } dof_probedesc_t;
   
   typedef struct dof_actdesc {
           dof_secidx_t dofa_difo;         /* link to DOF_SECT_DIFOHDR */
           dof_secidx_t dofa_strtab;       /* link to DOF_SECT_STRTAB section */
           uint32_t dofa_kind;             /* action kind (DTRACEACT_* constant) */
           uint32_t dofa_ntuple;           /* number of subsequent tuple actions */
           uint64_t dofa_arg;              /* kind-specific argument */
           uint64_t dofa_uarg;             /* user-supplied argument */
   } dof_actdesc_t;
   
   typedef struct dof_difohdr {
           dtrace_diftype_t dofd_rtype;    /* return type for this fragment */
           dof_secidx_t dofd_links[1];     /* variable length array of indices */
   } dof_difohdr_t;
   
   typedef struct dof_relohdr {
           dof_secidx_t dofr_strtab;       /* link to DOF_SECT_STRTAB for names */
           dof_secidx_t dofr_relsec;       /* link to DOF_SECT_RELTAB for relos */
           dof_secidx_t dofr_tgtsec;       /* link to section we are relocating */
   } dof_relohdr_t;
   
   typedef struct dof_relodesc {
           dof_stridx_t dofr_name;         /* string name of relocation symbol */
           uint32_t dofr_type;             /* relo type (DOF_RELO_* constant) */
           uint64_t dofr_offset;           /* byte offset for relocation */
           uint64_t dofr_data;             /* additional type-specific data */
   } dof_relodesc_t;
   
   #define DOF_RELO_NONE   0               /* empty relocation entry */
   #define DOF_RELO_SETX   1               /* relocate setx value */
   #define DOF_RELO_DOFREL 2               /* relocate DOF-relative value */
   
   typedef struct dof_optdesc {
           uint32_t dofo_option;           /* option identifier */
           dof_secidx_t dofo_strtab;       /* string table, if string option */
           uint64_t dofo_value;            /* option value or string index */
   } dof_optdesc_t;
   
   typedef uint32_t dof_attr_t;            /* encoded stability attributes */
   
   #define DOF_ATTR(n, d, c)       (((n) << 24) | ((d) << 16) | ((c) << 8))
   #define DOF_ATTR_NAME(a)        (((a) >> 24) & 0xff)
   #define DOF_ATTR_DATA(a)        (((a) >> 16) & 0xff)
   #define DOF_ATTR_CLASS(a)       (((a) >>  8) & 0xff)
   
   typedef struct dof_provider {
           dof_secidx_t dofpv_strtab;      /* link to DOF_SECT_STRTAB section */
           dof_secidx_t dofpv_probes;      /* link to DOF_SECT_PROBES section */
           dof_secidx_t dofpv_prargs;      /* link to DOF_SECT_PRARGS section */
           dof_secidx_t dofpv_proffs;      /* link to DOF_SECT_PROFFS section */
           dof_stridx_t dofpv_name;        /* provider name string */
           dof_attr_t dofpv_provattr;      /* provider attributes */
           dof_attr_t dofpv_modattr;       /* module attributes */
           dof_attr_t dofpv_funcattr;      /* function attributes */
           dof_attr_t dofpv_nameattr;      /* name attributes */
           dof_attr_t dofpv_argsattr;      /* args attributes */
           dof_secidx_t dofpv_prenoffs;    /* link to DOF_SECT_PRENOFFS section */
   } dof_provider_t;
   
   typedef struct dof_probe {
           uint64_t dofpr_addr;            /* probe base address or offset */
           dof_stridx_t dofpr_func;        /* probe function string */
           dof_stridx_t dofpr_name;        /* probe name string */
           dof_stridx_t dofpr_nargv;       /* native argument type strings */
           dof_stridx_t dofpr_xargv;       /* translated argument type strings */
           uint32_t dofpr_argidx;          /* index of first argument mapping */
           uint32_t dofpr_offidx;          /* index of first offset entry */
           uint8_t dofpr_nargc;            /* native argument count */
           uint8_t dofpr_xargc;            /* translated argument count */
           uint16_t dofpr_noffs;           /* number of offset entries for probe */
           uint32_t dofpr_enoffidx;        /* index of first is-enabled offset */
           uint16_t dofpr_nenoffs;         /* number of is-enabled offsets */
           uint16_t dofpr_pad1;            /* reserved for future use */
           uint32_t dofpr_pad2;            /* reserved for future use */
   } dof_probe_t;
   
   typedef struct dof_xlator {
           dof_secidx_t dofxl_members;     /* link to DOF_SECT_XLMEMBERS section */
           dof_secidx_t dofxl_strtab;      /* link to DOF_SECT_STRTAB section */
           dof_stridx_t dofxl_argv;        /* input parameter type strings */
           uint32_t dofxl_argc;            /* input parameter list length */
           dof_stridx_t dofxl_type;        /* output type string name */
           dof_attr_t dofxl_attr;          /* output stability attributes */
   } dof_xlator_t;
   
   typedef struct dof_xlmember {
           dof_secidx_t dofxm_difo;        /* member link to DOF_SECT_DIFOHDR */
           dof_stridx_t dofxm_name;        /* member name */
           dtrace_diftype_t dofxm_type;    /* member type */
   } dof_xlmember_t;
   
   typedef struct dof_xlref {
           dof_secidx_t dofxr_xlator;      /* link to DOF_SECT_XLATORS section */
           uint32_t dofxr_member;          /* index of referenced dof_xlmember */
           uint32_t dofxr_argn;            /* index of argument for DIF_OP_XLARG */
   } dof_xlref_t;
   
   /*
    * DTrace Intermediate Format Object (DIFO)
    *
    * A DIFO is used to store the compiled DIF for a D expression, its return
    * type, and its string and variable tables.  The string table is a single
    * buffer of character data into which sets instructions and variable
    * references can reference strings using a byte offset.  The variable table
    * is an array of dtrace_difv_t structures that describe the name and type of
    * each variable and the id used in the DIF code.  This structure is described
    * above in the DIF section of this header file.  The DIFO is used at both
    * user-level (in the library) and in the kernel, but the structure is never
    * passed between the two: the DOF structures form the only interface.  As a
    * result, the definition can change depending on the presence of _KERNEL.
    */
   typedef struct dtrace_difo {
           dif_instr_t *dtdo_buf;          /* instruction buffer */
           uint64_t *dtdo_inttab;          /* integer table (optional) */
           char *dtdo_strtab;              /* string table (optional) */
           dtrace_difv_t *dtdo_vartab;     /* variable table (optional) */
           uint_t dtdo_len;                /* length of instruction buffer */
           uint_t dtdo_intlen;             /* length of integer table */
           uint_t dtdo_strlen;             /* length of string table */
           uint_t dtdo_varlen;             /* length of variable table */
           dtrace_diftype_t dtdo_rtype;    /* return type */
           uint_t dtdo_refcnt;             /* owner reference count */
           uint_t dtdo_destructive;        /* invokes destructive subroutines */
   #ifndef _KERNEL
           dof_relodesc_t *dtdo_kreltab;   /* kernel relocations */
           dof_relodesc_t *dtdo_ureltab;   /* user relocations */
           struct dt_node **dtdo_xlmtab;   /* translator references */
           uint_t dtdo_krelen;             /* length of krelo table */
           uint_t dtdo_urelen;             /* length of urelo table */
           uint_t dtdo_xlmlen;             /* length of translator table */
   #endif
   } dtrace_difo_t;
   
   /*
    * DTrace Enabling Description Structures
    *
    * When DTrace is tracking the description of a DTrace enabling entity (probe,
    * predicate, action, ECB, record, etc.), it does so in a description
    * structure.  These structures all end in "desc", and are used at both
    * user-level and in the kernel -- but (with the exception of
    * dtrace_probedesc_t) they are never passed between them.  Typically,
    * user-level will use the description structures when assembling an enabling.
    * It will then distill those description structures into a DOF object (see
    * above), and send it into the kernel.  The kernel will again use the
    * description structures to create a description of the enabling as it reads
    * the DOF.  When the description is complete, the enabling will be actually
    * created -- turning it into the structures that represent the enabling
    * instead of merely describing it.  Not surprisingly, the description
    * structures bear a strong resemblance to the DOF structures that act as their
    * conduit.
    */
   struct dtrace_predicate;
   
   typedef struct dtrace_probedesc {
           dtrace_id_t dtpd_id;                    /* probe identifier */
           char dtpd_provider[DTRACE_PROVNAMELEN]; /* probe provider name */
           char dtpd_mod[DTRACE_MODNAMELEN];       /* probe module name */
           char dtpd_func[DTRACE_FUNCNAMELEN];     /* probe function name */
           char dtpd_name[DTRACE_NAMELEN];         /* probe name */
   } dtrace_probedesc_t;
   
   typedef struct dtrace_repldesc {
           dtrace_probedesc_t dtrpd_match;         /* probe descr. to match */
           dtrace_probedesc_t dtrpd_create;        /* probe descr. to create */
   } dtrace_repldesc_t;
   
   typedef struct dtrace_preddesc {
           dtrace_difo_t *dtpdd_difo;              /* pointer to DIF object */
           struct dtrace_predicate *dtpdd_predicate; /* pointer to predicate */
   } dtrace_preddesc_t;
   
   typedef struct dtrace_actdesc {
           dtrace_difo_t *dtad_difo;               /* pointer to DIF object */
           struct dtrace_actdesc *dtad_next;       /* next action */
           dtrace_actkind_t dtad_kind;             /* kind of action */
           uint32_t dtad_ntuple;                   /* number in tuple */
           uint64_t dtad_arg;                      /* action argument */
           uint64_t dtad_uarg;                     /* user argument */
           int dtad_refcnt;                        /* reference count */
   } dtrace_actdesc_t;
   
   typedef struct dtrace_ecbdesc {
           dtrace_actdesc_t *dted_action;          /* action description(s) */
           dtrace_preddesc_t dted_pred;            /* predicate description */
           dtrace_probedesc_t dted_probe;          /* probe description */
           uint64_t dted_uarg;                     /* library argument */
           int dted_refcnt;                        /* reference count */
   } dtrace_ecbdesc_t;
   
   /*
    * DTrace Metadata Description Structures
    *
    * DTrace separates the trace data stream from the metadata stream.  The only
    * metadata tokens placed in the data stream are the dtrace_rechdr_t (EPID +
    * timestamp) or (in the case of aggregations) aggregation identifiers.  To
    * determine the structure of the data, DTrace consumers pass the token to the
    * kernel, and receive in return a corresponding description of the enabled
    * probe (via the dtrace_eprobedesc structure) or the aggregation (via the
    * dtrace_aggdesc structure).  Both of these structures are expressed in terms
    * of record descriptions (via the dtrace_recdesc structure) that describe the
    * exact structure of the data.  Some record descriptions may also contain a
    * format identifier; this additional bit of metadata can be retrieved from the
    * kernel, for which a format description is returned via the dtrace_fmtdesc
    * structure.  Note that all four of these structures must be bitness-neutral
    * to allow for a 32-bit DTrace consumer on a 64-bit kernel.
    */
   typedef struct dtrace_recdesc {
           dtrace_actkind_t dtrd_action;           /* kind of action */
           uint32_t dtrd_size;                     /* size of record */
           uint32_t dtrd_offset;                   /* offset in ECB's data */
           uint16_t dtrd_alignment;                /* required alignment */
           uint16_t dtrd_format;                   /* format, if any */
           uint64_t dtrd_arg;                      /* action argument */
           uint64_t dtrd_uarg;                     /* user argument */
   } dtrace_recdesc_t;
   
   typedef struct dtrace_eprobedesc {
           dtrace_epid_t dtepd_epid;               /* enabled probe ID */
           dtrace_id_t dtepd_probeid;              /* probe ID */
           uint64_t dtepd_uarg;                    /* library argument */
           uint32_t dtepd_size;                    /* total size */
           int dtepd_nrecs;                        /* number of records */
           dtrace_recdesc_t dtepd_rec[1];          /* records themselves */
   } dtrace_eprobedesc_t;
   
   typedef struct dtrace_aggdesc {
           DTRACE_PTR(char, dtagd_name);           /* not filled in by kernel */
           dtrace_aggvarid_t dtagd_varid;          /* not filled in by kernel */
           int dtagd_flags;                        /* not filled in by kernel */
           dtrace_aggid_t dtagd_id;                /* aggregation ID */
           dtrace_epid_t dtagd_epid;               /* enabled probe ID */
           uint32_t dtagd_size;                    /* size in bytes */
           int dtagd_nrecs;                        /* number of records */
           uint32_t dtagd_pad;                     /* explicit padding */
          dtrace_recdesc_t dtagd_rec[1];          /* record descriptions */
  } dtrace_aggdesc_t;
  
  typedef struct dtrace_fmtdesc {
          DTRACE_PTR(char, dtfd_string);          /* format string */
          int dtfd_length;                        /* length of format string */
          uint16_t dtfd_format;                   /* format identifier */
  } dtrace_fmtdesc_t;
  
  #define DTRACE_SIZEOF_EPROBEDESC(desc)                          \
          (sizeof (dtrace_eprobedesc_t) + ((desc)->dtepd_nrecs ?  \
          (((desc)->dtepd_nrecs - 1) * sizeof (dtrace_recdesc_t)) : 0))
  
  #define DTRACE_SIZEOF_AGGDESC(desc)                             \
          (sizeof (dtrace_aggdesc_t) + ((desc)->dtagd_nrecs ?     \
          (((desc)->dtagd_nrecs - 1) * sizeof (dtrace_recdesc_t)) : 0))
  
  /*
   * DTrace Option Interface
   *
   * Run-time DTrace options are set and retrieved via DOF_SECT_OPTDESC sections
   * in a DOF image.  The dof_optdesc structure contains an option identifier and
   * an option value.  The valid option identifiers are found below; the mapping
   * between option identifiers and option identifying strings is maintained at
   * user-level.  Note that the value of DTRACEOPT_UNSET is such that all of the
   * following are potentially valid option values:  all positive integers, zero
   * and negative one.  Some options (notably "bufpolicy" and "bufresize") take
   * predefined tokens as their values; these are defined with
   * DTRACEOPT_{option}_{token}.
   */
  #define DTRACEOPT_BUFSIZE       0       /* buffer size */
  #define DTRACEOPT_BUFPOLICY     1       /* buffer policy */
  #define DTRACEOPT_DYNVARSIZE    2       /* dynamic variable size */
  #define DTRACEOPT_AGGSIZE       3       /* aggregation size */
  #define DTRACEOPT_SPECSIZE      4       /* speculation size */
  #define DTRACEOPT_NSPEC         5       /* number of speculations */
  #define DTRACEOPT_STRSIZE       6       /* string size */
  #define DTRACEOPT_CLEANRATE     7       /* dynvar cleaning rate */
  #define DTRACEOPT_CPU           8       /* CPU to trace */
  #define DTRACEOPT_BUFRESIZE     9       /* buffer resizing policy */
  #define DTRACEOPT_GRABANON      10      /* grab anonymous state, if any */
  #define DTRACEOPT_FLOWINDENT    11      /* indent function entry/return */
  #define DTRACEOPT_QUIET         12      /* only output explicitly traced data */
  #define DTRACEOPT_STACKFRAMES   13      /* number of stack frames */
  #define DTRACEOPT_USTACKFRAMES  14      /* number of user stack frames */
  #define DTRACEOPT_AGGRATE       15      /* aggregation snapshot rate */
  #define DTRACEOPT_SWITCHRATE    16      /* buffer switching rate */
  #define DTRACEOPT_STATUSRATE    17      /* status rate */
  #define DTRACEOPT_DESTRUCTIVE   18      /* destructive actions allowed */
  #define DTRACEOPT_STACKINDENT   19      /* output indent for stack traces */
  #define DTRACEOPT_RAWBYTES      20      /* always print bytes in raw form */
  #define DTRACEOPT_JSTACKFRAMES  21      /* number of jstack() frames */
  #define DTRACEOPT_JSTACKSTRSIZE 22      /* size of jstack() string table */
  #define DTRACEOPT_AGGSORTKEY    23      /* sort aggregations by key */
  #define DTRACEOPT_AGGSORTREV    24      /* reverse-sort aggregations */
  #define DTRACEOPT_AGGSORTPOS    25      /* agg. position to sort on */
  #define DTRACEOPT_AGGSORTKEYPOS 26      /* agg. key position to sort on */
  #define DTRACEOPT_TEMPORAL      27      /* temporally ordered output */
  #define DTRACEOPT_AGGHIST       28      /* histogram aggregation output */
  #define DTRACEOPT_AGGPACK       29      /* packed aggregation output */
  #define DTRACEOPT_AGGZOOM       30      /* zoomed aggregation scaling */
  #define DTRACEOPT_ZONE          31      /* zone in which to enable probes */
  #define DTRACEOPT_MAX           32      /* number of options */
  
  #define DTRACEOPT_UNSET         (dtrace_optval_t)-2     /* unset option */
  
  #define DTRACEOPT_BUFPOLICY_RING        0       /* ring buffer */
  #define DTRACEOPT_BUFPOLICY_FILL        1       /* fill buffer, then stop */
  #define DTRACEOPT_BUFPOLICY_SWITCH      2       /* switch buffers */
  
  #define DTRACEOPT_BUFRESIZE_AUTO        0       /* automatic resizing */
  #define DTRACEOPT_BUFRESIZE_MANUAL      1       /* manual resizing */
  
  /*
   * DTrace Buffer Interface
   *
   * In order to get a snapshot of the principal or aggregation buffer,
   * user-level passes a buffer description to the kernel with the dtrace_bufdesc
   * structure.  This describes which CPU user-level is interested in, and
   * where user-level wishes the kernel to snapshot the buffer to (the
   * dtbd_data field).  The kernel uses the same structure to pass back some
   * information regarding the buffer:  the size of data actually copied out, the
   * number of drops, the number of errors, the offset of the oldest record,
   * and the time of the snapshot.
   *
   * If the buffer policy is a "switch" policy, taking a snapshot of the
   * principal buffer has the additional effect of switching the active and
   * inactive buffers.  Taking a snapshot of the aggregation buffer _always_ has
   * the additional effect of switching the active and inactive buffers.
   */
  typedef struct dtrace_bufdesc {
          uint64_t dtbd_size;                     /* size of buffer */
          uint32_t dtbd_cpu;                      /* CPU or DTRACE_CPUALL */
          uint32_t dtbd_errors;                   /* number of errors */
          uint64_t dtbd_drops;                    /* number of drops */
          DTRACE_PTR(char, dtbd_data);            /* data */
          uint64_t dtbd_oldest;                   /* offset of oldest record */
          uint64_t dtbd_timestamp;                /* hrtime of snapshot */
  } dtrace_bufdesc_t;
  
  /*
   * Each record in the buffer (dtbd_data) begins with a header that includes
   * the epid and a timestamp.  The timestamp is split into two 4-byte parts
   * so that we do not require 8-byte alignment.
   */
  typedef struct dtrace_rechdr {
          dtrace_epid_t dtrh_epid;                /* enabled probe id */
          uint32_t dtrh_timestamp_hi;             /* high bits of hrtime_t */
          uint32_t dtrh_timestamp_lo;             /* low bits of hrtime_t */
  } dtrace_rechdr_t;
  
  #define DTRACE_RECORD_LOAD_TIMESTAMP(dtrh)                      \
          ((dtrh)->dtrh_timestamp_lo +                            \
          ((uint64_t)(dtrh)->dtrh_timestamp_hi << 32))
  
  #define DTRACE_RECORD_STORE_TIMESTAMP(dtrh, hrtime) {           \
          (dtrh)->dtrh_timestamp_lo = (uint32_t)hrtime;           \
          (dtrh)->dtrh_timestamp_hi = hrtime >> 32;               \
  }
  
  /*
   * DTrace Status
   *
   * The status of DTrace is relayed via the dtrace_status structure.  This
   * structure contains members to count drops other than the capacity drops
   * available via the buffer interface (see above).  This consists of dynamic
   * drops (including capacity dynamic drops, rinsing drops and dirty drops), and
   * speculative drops (including capacity speculative drops, drops due to busy
   * speculative buffers and drops due to unavailable speculative buffers).
   * Additionally, the status structure contains a field to indicate the number
   * of "fill"-policy buffers have been filled and a boolean field to indicate
   * that exit() has been called.  If the dtst_exiting field is non-zero, no
   * further data will be generated until tracing is stopped (at which time any
   * enablings of the END action will be processed); if user-level sees that
   * this field is non-zero, tracing should be stopped as soon as possible.
   */
  typedef struct dtrace_status {
          uint64_t dtst_dyndrops;                 /* dynamic drops */
          uint64_t dtst_dyndrops_rinsing;         /* dyn drops due to rinsing */
          uint64_t dtst_dyndrops_dirty;           /* dyn drops due to dirty */
          uint64_t dtst_specdrops;                /* speculative drops */
          uint64_t dtst_specdrops_busy;           /* spec drops due to busy */
          uint64_t dtst_specdrops_unavail;        /* spec drops due to unavail */
          uint64_t dtst_errors;                   /* total errors */
          uint64_t dtst_filled;                   /* number of filled bufs */
          uint64_t dtst_stkstroverflows;          /* stack string tab overflows */
          uint64_t dtst_dblerrors;                /* errors in ERROR probes */
          char dtst_killed;                       /* non-zero if killed */
          char dtst_exiting;                      /* non-zero if exit() called */
          char dtst_pad[6];                       /* pad out to 64-bit align */
  } dtrace_status_t;
  
  /*
   * DTrace Configuration
   *
   * User-level may need to understand some elements of the kernel DTrace
   * configuration in order to generate correct DIF.  This information is
   * conveyed via the dtrace_conf structure.
   */
  typedef struct dtrace_conf {
          uint_t dtc_difversion;                  /* supported DIF version */
          uint_t dtc_difintregs;                  /* # of DIF integer registers */
          uint_t dtc_diftupregs;                  /* # of DIF tuple registers */
          uint_t dtc_ctfmodel;                    /* CTF data model */
          uint_t dtc_pad[8];                      /* reserved for future use */
  } dtrace_conf_t;
  
  /*
   * DTrace Faults
   *
   * The constants below DTRACEFLT_LIBRARY indicate probe processing faults;
   * constants at or above DTRACEFLT_LIBRARY indicate faults in probe
   * postprocessing at user-level.  Probe processing faults induce an ERROR
   * probe and are replicated in unistd.d to allow users' ERROR probes to decode
   * the error condition using thse symbolic labels.
   */
  #define DTRACEFLT_UNKNOWN               0       /* Unknown fault */
  #define DTRACEFLT_BADADDR               1       /* Bad address */
  #define DTRACEFLT_BADALIGN              2       /* Bad alignment */
  #define DTRACEFLT_ILLOP                 3       /* Illegal operation */
  #define DTRACEFLT_DIVZERO               4       /* Divide-by-zero */
  #define DTRACEFLT_NOSCRATCH             5       /* Out of scratch space */
  #define DTRACEFLT_KPRIV                 6       /* Illegal kernel access */
  #define DTRACEFLT_UPRIV                 7       /* Illegal user access */
  #define DTRACEFLT_TUPOFLOW              8       /* Tuple stack overflow */
  #define DTRACEFLT_BADSTACK              9       /* Bad stack */
  
  #define DTRACEFLT_LIBRARY               1000    /* Library-level fault */
  
  /*
   * DTrace Argument Types
   *
   * Because it would waste both space and time, argument types do not reside
   * with the probe.  In order to determine argument types for args[X]
   * variables, the D compiler queries for argument types on a probe-by-probe
   * basis.  (This optimizes for the common case that arguments are either not
   * used or used in an untyped fashion.)  Typed arguments are specified with a
   * string of the type name in the dtragd_native member of the argument
   * description structure.  Typed arguments may be further translated to types
   * of greater stability; the provider indicates such a translated argument by
   * filling in the dtargd_xlate member with the string of the translated type.
   * Finally, the provider may indicate which argument value a given argument
   * maps to by setting the dtargd_mapping member -- allowing a single argument
   * to map to multiple args[X] variables.
   */
  typedef struct dtrace_argdesc {
          dtrace_id_t dtargd_id;                  /* probe identifier */
          int dtargd_ndx;                         /* arg number (-1 iff none) */
          int dtargd_mapping;                     /* value mapping */
          char dtargd_native[DTRACE_ARGTYPELEN];  /* native type name */
          char dtargd_xlate[DTRACE_ARGTYPELEN];   /* translated type name */
  } dtrace_argdesc_t;
  
  /*
   * DTrace Stability Attributes
   *
   * Each DTrace provider advertises the name and data stability of each of its
   * probe description components, as well as its architectural dependencies.
   * The D compiler can query the provider attributes (dtrace_pattr_t below) in
   * order to compute the properties of an input program and report them.
   */
  typedef uint8_t dtrace_stability_t;     /* stability code (see attributes(5)) */
  typedef uint8_t dtrace_class_t;         /* architectural dependency class */
  
  #define DTRACE_STABILITY_INTERNAL       0       /* private to DTrace itself */
  #define DTRACE_STABILITY_PRIVATE        1       /* private to Sun (see docs) */
  #define DTRACE_STABILITY_OBSOLETE       2       /* scheduled for removal */
  #define DTRACE_STABILITY_EXTERNAL       3       /* not controlled by Sun */
  #define DTRACE_STABILITY_UNSTABLE       4       /* new or rapidly changing */
  #define DTRACE_STABILITY_EVOLVING       5       /* less rapidly changing */
  #define DTRACE_STABILITY_STABLE         6       /* mature interface from Sun */
  #define DTRACE_STABILITY_STANDARD       7       /* industry standard */
  #define DTRACE_STABILITY_MAX            7       /* maximum valid stability */
  
  #define DTRACE_CLASS_UNKNOWN    0       /* unknown architectural dependency */
  #define DTRACE_CLASS_CPU        1       /* CPU-module-specific */
  #define DTRACE_CLASS_PLATFORM   2       /* platform-specific (uname -i) */
  #define DTRACE_CLASS_GROUP      3       /* hardware-group-specific (uname -m) */
  #define DTRACE_CLASS_ISA        4       /* ISA-specific (uname -p) */
  #define DTRACE_CLASS_COMMON     5       /* common to all systems */
  #define DTRACE_CLASS_MAX        5       /* maximum valid class */
  
  #define DTRACE_PRIV_NONE        0x0000
  #define DTRACE_PRIV_KERNEL      0x0001
  #define DTRACE_PRIV_USER        0x0002
  #define DTRACE_PRIV_PROC        0x0004
  #define DTRACE_PRIV_OWNER       0x0008
  #define DTRACE_PRIV_ZONEOWNER   0x0010
  
  #define DTRACE_PRIV_ALL \
          (DTRACE_PRIV_KERNEL | DTRACE_PRIV_USER | \
          DTRACE_PRIV_PROC | DTRACE_PRIV_OWNER | DTRACE_PRIV_ZONEOWNER)
  
  typedef struct dtrace_ppriv {
          uint32_t dtpp_flags;                    /* privilege flags */
          uid_t dtpp_uid;                         /* user ID */
          zoneid_t dtpp_zoneid;                   /* zone ID */
  } dtrace_ppriv_t;
  
  typedef struct dtrace_attribute {
          dtrace_stability_t dtat_name;           /* entity name stability */
          dtrace_stability_t dtat_data;           /* entity data stability */
          dtrace_class_t dtat_class;              /* entity data dependency */
  } dtrace_attribute_t;
  
  typedef struct dtrace_pattr {
          dtrace_attribute_t dtpa_provider;       /* provider attributes */
          dtrace_attribute_t dtpa_mod;            /* module attributes */
          dtrace_attribute_t dtpa_func;           /* function attributes */
          dtrace_attribute_t dtpa_name;           /* name attributes */
          dtrace_attribute_t dtpa_args;           /* args[] attributes */
  } dtrace_pattr_t;
  
  typedef struct dtrace_providerdesc {
          char dtvd_name[DTRACE_PROVNAMELEN];     /* provider name */
          dtrace_pattr_t dtvd_attr;               /* stability attributes */
          dtrace_ppriv_t dtvd_priv;               /* privileges required */
  } dtrace_providerdesc_t;
  
  /*
   * DTrace Pseudodevice Interface
   *
   * DTrace is controlled through ioctl(2)'s to the in-kernel dtrace:dtrace
   * pseudodevice driver.  These ioctls comprise the user-kernel interface to
   * DTrace.
   */
  #ifdef illumos
  #define DTRACEIOC               (('d' << 24) | ('t' << 16) | ('r' << 8))
  #define DTRACEIOC_PROVIDER      (DTRACEIOC | 1)         /* provider query */
  #define DTRACEIOC_PROBES        (DTRACEIOC | 2)         /* probe query */
  #define DTRACEIOC_BUFSNAP       (DTRACEIOC | 4)         /* snapshot buffer */
  #define DTRACEIOC_PROBEMATCH    (DTRACEIOC | 5)         /* match probes */
  #define DTRACEIOC_ENABLE        (DTRACEIOC | 6)         /* enable probes */
  #define DTRACEIOC_AGGSNAP       (DTRACEIOC | 7)         /* snapshot agg. */
  #define DTRACEIOC_EPROBE        (DTRACEIOC | 8)         /* get eprobe desc. */
  #define DTRACEIOC_PROBEARG      (DTRACEIOC | 9)         /* get probe arg */
  #define DTRACEIOC_CONF          (DTRACEIOC | 10)        /* get config. */
  #define DTRACEIOC_STATUS        (DTRACEIOC | 11)        /* get status */
  #define DTRACEIOC_GO            (DTRACEIOC | 12)        /* start tracing */
  #define DTRACEIOC_STOP          (DTRACEIOC | 13)        /* stop tracing */
  #define DTRACEIOC_AGGDESC       (DTRACEIOC | 15)        /* get agg. desc. */
  #define DTRACEIOC_FORMAT        (DTRACEIOC | 16)        /* get format str */
  #define DTRACEIOC_DOFGET        (DTRACEIOC | 17)        /* get DOF */
  #define DTRACEIOC_REPLICATE     (DTRACEIOC | 18)        /* replicate enab */
  #else
  #define DTRACEIOC_PROVIDER      _IOWR('x',1,dtrace_providerdesc_t)
                                                          /* provider query */
  #define DTRACEIOC_PROBES        _IOWR('x',2,dtrace_probedesc_t)
                                                          /* probe query */
  #define DTRACEIOC_BUFSNAP       _IOW('x',4,dtrace_bufdesc_t *)  
                                                          /* snapshot buffer */
  #define DTRACEIOC_PROBEMATCH    _IOWR('x',5,dtrace_probedesc_t)
                                                          /* match probes */
  typedef struct {
          void    *dof;           /* DOF userland address written to driver. */
          int     n_matched;      /* # matches returned by driver. */
  } dtrace_enable_io_t;
  #define DTRACEIOC_ENABLE        _IOWR('x',6,dtrace_enable_io_t)
                                                          /* enable probes */
  #define DTRACEIOC_AGGSNAP       _IOW('x',7,dtrace_bufdesc_t *)
                                                          /* snapshot agg. */
  #define DTRACEIOC_EPROBE        _IOW('x',8,dtrace_eprobedesc_t)
                                                          /* get eprobe desc. */
  #define DTRACEIOC_PROBEARG      _IOWR('x',9,dtrace_argdesc_t)
                                                          /* get probe arg */
  #define DTRACEIOC_CONF          _IOR('x',10,dtrace_conf_t)
                                                          /* get config. */
  #define DTRACEIOC_STATUS        _IOR('x',11,dtrace_status_t)
                                                          /* get status */
  #define DTRACEIOC_GO            _IOR('x',12,processorid_t)
                                                          /* start tracing */
  #define DTRACEIOC_STOP          _IOWR('x',13,processorid_t)
                                                          /* stop tracing */
  #define DTRACEIOC_AGGDESC       _IOW('x',15,dtrace_aggdesc_t *) 
                                                          /* get agg. desc. */
  #define DTRACEIOC_FORMAT        _IOWR('x',16,dtrace_fmtdesc_t)  
                                                          /* get format str */
  #define DTRACEIOC_DOFGET        _IOW('x',17,dof_hdr_t *)
                                                          /* get DOF */
  #define DTRACEIOC_REPLICATE     _IOW('x',18,dtrace_repldesc_t)  
                                                          /* replicate enab */
  #endif
  
  /*
   * DTrace Helpers
   *
   * In general, DTrace establishes probes in processes and takes actions on
   * processes without knowing their specific user-level structures.  Instead of
   * existing in the framework, process-specific knowledge is contained by the
   * enabling D program -- which can apply process-specific knowledge by making
   * appropriate use of DTrace primitives like copyin() and copyinstr() to
   * operate on user-level data.  However, there may exist some specific probes
   * of particular semantic relevance that the application developer may wish to
   * explicitly export.  For example, an application may wish to export a probe
   * at the point that it begins and ends certain well-defined transactions.  In
   * addition to providing probes, programs may wish to offer assistance for
   * certain actions.  For example, in highly dynamic environments (e.g., Java),
   * it may be difficult to obtain a stack trace in terms of meaningful symbol
   * names (the translation from instruction addresses to corresponding symbol
   * names may only be possible in situ); these environments may wish to define
   * a series of actions to be applied in situ to obtain a meaningful stack
   * trace.
   *
   * These two mechanisms -- user-level statically defined tracing and assisting
   * DTrace actions -- are provided via DTrace _helpers_.  Helpers are specified
   * via DOF, but unlike enabling DOF, helper DOF may contain definitions of
   * providers, probes and their arguments.  If a helper wishes to provide
   * action assistance, probe descriptions and corresponding DIF actions may be
   * specified in the helper DOF.  For such helper actions, however, the probe
   * description describes the specific helper:  all DTrace helpers have the
   * provider name "dtrace" and the module name "helper", and the name of the
   * helper is contained in the function name (for example, the ustack() helper
   * is named "ustack").  Any helper-specific name may be contained in the name
   * (for example, if a helper were to have a constructor, it might be named
   * "dtrace:helper:<helper>:init").  Helper actions are only called when the
   * action that they are helping is taken.  Helper actions may only return DIF
   * expressions, and may only call the following subroutines:
   *
   *    alloca()      <= Allocates memory out of the consumer's scratch space
   *    bcopy()       <= Copies memory to scratch space
   *    copyin()      <= Copies memory from user-level into consumer's scratch
   *    copyinto()    <= Copies memory into a specific location in scratch
   *    copyinstr()   <= Copies a string into a specific location in scratch
   *
   * Helper actions may only access the following built-in variables:
   *
   *    curthread     <= Current kthread_t pointer
   *    tid           <= Current thread identifier
   *    pid           <= Current process identifier
   *    ppid          <= Parent process identifier
   *    uid           <= Current user ID
   *    gid           <= Current group ID
   *    execname      <= Current executable name
   *    zonename      <= Current zone name
   *
   * Helper actions may not manipulate or allocate dynamic variables, but they
   * may have clause-local and statically-allocated global variables.  The
   * helper action variable state is specific to the helper action -- variables
   * used by the helper action may not be accessed outside of the helper
   * action, and the helper action may not access variables that like outside
   * of it.  Helper actions may not load from kernel memory at-large; they are
   * restricting to loading current user state (via copyin() and variants) and
   * scratch space.  As with probe enablings, helper actions are executed in
   * program order.  The result of the helper action is the result of the last
   * executing helper expression.
   *
   * Helpers -- composed of either providers/probes or probes/actions (or both)
   * -- are added by opening the "helper" minor node, and issuing an ioctl(2)
   * (DTRACEHIOC_ADDDOF) that specifies the dof_helper_t structure. This
   * encapsulates the name and base address of the user-level library or
   * executable publishing the helpers and probes as well as the DOF that
   * contains the definitions of those helpers and probes.
   *
   * The DTRACEHIOC_ADD and DTRACEHIOC_REMOVE are left in place for legacy
   * helpers and should no longer be used.  No other ioctls are valid on the
   * helper minor node.
   */
  #ifdef illumos
  #define DTRACEHIOC              (('d' << 24) | ('t' << 16) | ('h' << 8))
  #define DTRACEHIOC_ADD          (DTRACEHIOC | 1)        /* add helper */
  #define DTRACEHIOC_REMOVE       (DTRACEHIOC | 2)        /* remove helper */
  #define DTRACEHIOC_ADDDOF       (DTRACEHIOC | 3)        /* add helper DOF */
  #else
  #define DTRACEHIOC_REMOVE       _IOW('z', 2, int)       /* remove helper */
  #define DTRACEHIOC_ADDDOF       _IOWR('z', 3, dof_helper_t)/* add helper DOF */
  #endif
  
  typedef struct dof_helper {
          char dofhp_mod[DTRACE_MODNAMELEN];      /* executable or library name */
          uint64_t dofhp_addr;                    /* base address of object */
          uint64_t dofhp_dof;                     /* address of helper DOF */
  #ifdef __FreeBSD__
          pid_t dofhp_pid;                        /* target process ID */
          int dofhp_gen;
  #endif
  } dof_helper_t;
  
  #define DTRACEMNR_DTRACE        "dtrace"        /* node for DTrace ops */
  #define DTRACEMNR_HELPER        "helper"        /* node for helpers */
  #define DTRACEMNRN_DTRACE       0               /* minor for DTrace ops */
  #define DTRACEMNRN_HELPER       1               /* minor for helpers */
  #define DTRACEMNRN_CLONE        2               /* first clone minor */
  
  #ifdef _KERNEL
  
  /*
   * DTrace Provider API
   *
   * The following functions are implemented by the DTrace framework and are
   * used to implement separate in-kernel DTrace providers.  Common functions
   * are provided in uts/common/os/dtrace.c.  ISA-dependent subroutines are
   * defined in uts/<isa>/dtrace/dtrace_asm.s or uts/<isa>/dtrace/dtrace_isa.c.
   *
   * The provider API has two halves:  the API that the providers consume from
   * DTrace, and the API that providers make available to DTrace.
   *
   * 1 Framework-to-Provider API
   *
   * 1.1  Overview
   *
   * The Framework-to-Provider API is represented by the dtrace_pops structure
   * that the provider passes to the framework when registering itself.  This
   * structure consists of the following members:
   *
   *   dtps_provide()          <-- Provide all probes, all modules
   *   dtps_provide_module()   <-- Provide all probes in specified module
   *   dtps_enable()           <-- Enable specified probe
   *   dtps_disable()          <-- Disable specified probe
   *   dtps_suspend()          <-- Suspend specified probe
   *   dtps_resume()           <-- Resume specified probe
   *   dtps_getargdesc()       <-- Get the argument description for args[X]
   *   dtps_getargval()        <-- Get the value for an argX or args[X] variable
   *   dtps_usermode()         <-- Find out if the probe was fired in user mode
   *   dtps_destroy()          <-- Destroy all state associated with this probe
   *
   * 1.2  void dtps_provide(void *arg, const dtrace_probedesc_t *spec)
   *
   * 1.2.1  Overview
   *
   *   Called to indicate that the provider should provide all probes.  If the
   *   specified description is non-NULL, dtps_provide() is being called because
   *   no probe matched a specified probe -- if the provider has the ability to
   *   create custom probes, it may wish to create a probe that matches the
   *   specified description.
   *
   * 1.2.2  Arguments and notes
   *
   *   The first argument is the cookie as passed to dtrace_register().  The
   *   second argument is a pointer to a probe description that the provider may
   *   wish to consider when creating custom probes.  The provider is expected to
   *   call back into the DTrace framework via dtrace_probe_create() to create
   *   any necessary probes.  dtps_provide() may be called even if the provider
   *   has made available all probes; the provider should check the return value
   *   of dtrace_probe_create() to handle this case.  Note that the provider need
   *   not implement both dtps_provide() and dtps_provide_module(); see
   *   "Arguments and Notes" for dtrace_register(), below.
   *
   * 1.2.3  Return value
   *
   *   None.
   *
   * 1.2.4  Caller's context
   *
   *   dtps_provide() is typically called from open() or ioctl() context, but may
   *   be called from other contexts as well.  The DTrace framework is locked in
   *   such a way that providers may not register or unregister.  This means that
   *   the provider may not call any DTrace API that affects its registration with
   *   the framework, including dtrace_register(), dtrace_unregister(),
   *   dtrace_invalidate(), and dtrace_condense().  However, the context is such
   *   that the provider may (and indeed, is expected to) call probe-related
   *   DTrace routines, including dtrace_probe_create(), dtrace_probe_lookup(),
   *   and dtrace_probe_arg().
   *
   * 1.3  void dtps_provide_module(void *arg, modctl_t *mp)
   *
   * 1.3.1  Overview
   *
   *   Called to indicate that the provider should provide all probes in the
   *   specified module.
   *
   * 1.3.2  Arguments and notes
   *
   *   The first argument is the cookie as passed to dtrace_register().  The
   *   second argument is a pointer to a modctl structure that indicates the
   *   module for which probes should be created.
   *
   * 1.3.3  Return value
   *
   *   None.
   *
   * 1.3.4  Caller's context
   *
   *   dtps_provide_module() may be called from open() or ioctl() context, but
   *   may also be called from a module loading context.  mod_lock is held, and
   *   the DTrace framework is locked in such a way that providers may not
   *   register or unregister.  This means that the provider may not call any
   *   DTrace API that affects its registration with the framework, including
   *   dtrace_register(), dtrace_unregister(), dtrace_invalidate(), and
   *   dtrace_condense().  However, the context is such that the provider may (and
   *   indeed, is expected to) call probe-related DTrace routines, including
   *   dtrace_probe_create(), dtrace_probe_lookup(), and dtrace_probe_arg().  Note
   *   that the provider need not implement both dtps_provide() and
   *   dtps_provide_module(); see "Arguments and Notes" for dtrace_register(),
   *   below.
   *
   * 1.4  void dtps_enable(void *arg, dtrace_id_t id, void *parg)
   *
   * 1.4.1  Overview
   *
   *   Called to enable the specified probe.
   *
   * 1.4.2  Arguments and notes
   *
   *   The first argument is the cookie as passed to dtrace_register().  The
   *   second argument is the identifier of the probe to be enabled.  The third
   *   argument is the probe argument as passed to dtrace_probe_create().
   *   dtps_enable() will be called when a probe transitions from not being
   *   enabled at all to having one or more ECB.  The number of ECBs associated
   *   with the probe may change without subsequent calls into the provider.
   *   When the number of ECBs drops to zero, the provider will be explicitly
   *   told to disable the probe via dtps_disable().  dtrace_probe() should never
   *   be called for a probe identifier that hasn't been explicitly enabled via
   *   dtps_enable().
   *
   * 1.4.3  Return value
   *
   *   None.
   *
   * 1.4.4  Caller's context
   *
   *   The DTrace framework is locked in such a way that it may not be called
   *   back into at all.  cpu_lock is held.  mod_lock is not held and may not
   *   be acquired.
   *
   * 1.5  void dtps_disable(void *arg, dtrace_id_t id, void *parg)
   *
   * 1.5.1  Overview
   *
   *   Called to disable the specified probe.
   *
   * 1.5.2  Arguments and notes
   *
   *   The first argument is the cookie as passed to dtrace_register().  The
   *   second argument is the identifier of the probe to be disabled.  The third
   *   argument is the probe argument as passed to dtrace_probe_create().
   *   dtps_disable() will be called when a probe transitions from being enabled
   *   to having zero ECBs.  dtrace_probe() should never be called for a probe
   *   identifier that has been explicitly enabled via dtps_disable().
   *
   * 1.5.3  Return value
   *
   *   None.
   *
   * 1.5.4  Caller's context
   *
   *   The DTrace framework is locked in such a way that it may not be called
   *   back into at all.  cpu_lock is held.  mod_lock is not held and may not
   *   be acquired.
   *
   * 1.6  void dtps_suspend(void *arg, dtrace_id_t id, void *parg)
   *
   * 1.6.1  Overview
   *
   *   Called to suspend the specified enabled probe.  This entry point is for
   *   providers that may need to suspend some or all of their probes when CPUs
   *   are being powered on or when the boot monitor is being entered for a
   *   prolonged period of time.
   *
   * 1.6.2  Arguments and notes
   *
   *   The first argument is the cookie as passed to dtrace_register().  The
   *   second argument is the identifier of the probe to be suspended.  The
   *   third argument is the probe argument as passed to dtrace_probe_create().
   *   dtps_suspend will only be called on an enabled probe.  Providers that
   *   provide a dtps_suspend entry point will want to take roughly the action
   *   that it takes for dtps_disable.
   *
   * 1.6.3  Return value
   *
   *   None.
   *
   * 1.6.4  Caller's context
   *
   *   Interrupts are disabled.  The DTrace framework is in a state such that the
   *   specified probe cannot be disabled or destroyed for the duration of
   *   dtps_suspend().  As interrupts are disabled, the provider is afforded
   *   little latitude; the provider is expected to do no more than a store to
   *   memory.
   *
   * 1.7  void dtps_resume(void *arg, dtrace_id_t id, void *parg)
   *
   * 1.7.1  Overview
   *
   *   Called to resume the specified enabled probe.  This entry point is for
   *   providers that may need to resume some or all of their probes after the
   *   completion of an event that induced a call to dtps_suspend().
   *
   * 1.7.2  Arguments and notes
   *
   *   The first argument is the cookie as passed to dtrace_register().  The
   *   second argument is the identifier of the probe to be resumed.  The
   *   third argument is the probe argument as passed to dtrace_probe_create().
   *   dtps_resume will only be called on an enabled probe.  Providers that
   *   provide a dtps_resume entry point will want to take roughly the action
   *   that it takes for dtps_enable.
   *
   * 1.7.3  Return value
   *
   *   None.
   *
   * 1.7.4  Caller's context
   *
   *   Interrupts are disabled.  The DTrace framework is in a state such that the
   *   specified probe cannot be disabled or destroyed for the duration of
   *   dtps_resume().  As interrupts are disabled, the provider is afforded
   *   little latitude; the provider is expected to do no more than a store to
   *   memory.
   *
   * 1.8  void dtps_getargdesc(void *arg, dtrace_id_t id, void *parg,
   *           dtrace_argdesc_t *desc)
   *
   * 1.8.1  Overview
   *
   *   Called to retrieve the argument description for an args[X] variable.
   *
   * 1.8.2  Arguments and notes
   *
   *   The first argument is the cookie as passed to dtrace_register(). The
   *   second argument is the identifier of the current probe. The third
   *   argument is the probe argument as passed to dtrace_probe_create(). The
   *   fourth argument is a pointer to the argument description.  This
   *   description is both an input and output parameter:  it contains the
   *   index of the desired argument in the dtargd_ndx field, and expects
   *   the other fields to be filled in upon return.  If there is no argument
   *   corresponding to the specified index, the dtargd_ndx field should be set
   *   to DTRACE_ARGNONE.
   *
   * 1.8.3  Return value
   *
   *   None.  The dtargd_ndx, dtargd_native, dtargd_xlate and dtargd_mapping
   *   members of the dtrace_argdesc_t structure are all output values.
   *
   * 1.8.4  Caller's context
   *
   *   dtps_getargdesc() is called from ioctl() context. mod_lock is held, and
   *   the DTrace framework is locked in such a way that providers may not
   *   register or unregister.  This means that the provider may not call any
   *   DTrace API that affects its registration with the framework, including
   *   dtrace_register(), dtrace_unregister(), dtrace_invalidate(), and
   *   dtrace_condense().
   *
   * 1.9  uint64_t dtps_getargval(void *arg, dtrace_id_t id, void *parg,
   *               int argno, int aframes)
   *
   * 1.9.1  Overview
   *
   *   Called to retrieve a value for an argX or args[X] variable.
   *
   * 1.9.2  Arguments and notes
   *
   *   The first argument is the cookie as passed to dtrace_register(). The
   *   second argument is the identifier of the current probe. The third
   *   argument is the probe argument as passed to dtrace_probe_create(). The
   *   fourth argument is the number of the argument (the X in the example in
   *   1.9.1). The fifth argument is the number of stack frames that were used
   *   to get from the actual place in the code that fired the probe to
   *   dtrace_probe() itself, the so-called artificial frames. This argument may
   *   be used to descend an appropriate number of frames to find the correct
   *   values. If this entry point is left NULL, the dtrace_getarg() built-in
   *   function is used.
   *
   * 1.9.3  Return value
   *
   *   The value of the argument.
   *
   * 1.9.4  Caller's context
   *
   *   This is called from within dtrace_probe() meaning that interrupts
   *   are disabled. No locks should be taken within this entry point.
   *
   * 1.10  int dtps_usermode(void *arg, dtrace_id_t id, void *parg)
   *
   * 1.10.1  Overview
   *
   *   Called to determine if the probe was fired in a user context.
   *
   * 1.10.2  Arguments and notes
   *
   *   The first argument is the cookie as passed to dtrace_register(). The
   *   second argument is the identifier of the current probe. The third
   *   argument is the probe argument as passed to dtrace_probe_create().  This
   *   entry point must not be left NULL for providers whose probes allow for
   *   mixed mode tracing, that is to say those probes that can fire during
   *   kernel- _or_ user-mode execution
   *
   * 1.10.3  Return value
   *
   *   A bitwise OR that encapsulates both the mode (either DTRACE_MODE_KERNEL
   *   or DTRACE_MODE_USER) and the policy when the privilege of the enabling
   *   is insufficient for that mode (a combination of DTRACE_MODE_NOPRIV_DROP,
   *   DTRACE_MODE_NOPRIV_RESTRICT, and DTRACE_MODE_LIMITEDPRIV_RESTRICT).  If
   *   DTRACE_MODE_NOPRIV_DROP bit is set, insufficient privilege will result
   *   in the probe firing being silently ignored for the enabling; if the
   *   DTRACE_NODE_NOPRIV_RESTRICT bit is set, insufficient privilege will not
   *   prevent probe processing for the enabling, but restrictions will be in
   *   place that induce a UPRIV fault upon attempt to examine probe arguments
   *   or current process state.  If the DTRACE_MODE_LIMITEDPRIV_RESTRICT bit
   *   is set, similar restrictions will be placed upon operation if the
   *   privilege is sufficient to process the enabling, but does not otherwise
   *   entitle the enabling to all zones.  The DTRACE_MODE_NOPRIV_DROP and
   *   DTRACE_MODE_NOPRIV_RESTRICT are mutually exclusive (and one of these
   *   two policies must be specified), but either may be combined (or not)
   *   with DTRACE_MODE_LIMITEDPRIV_RESTRICT.
   *
   * 1.10.4  Caller's context
   *
   *   This is called from within dtrace_probe() meaning that interrupts
   *   are disabled. No locks should be taken within this entry point.
   *
   * 1.11 void dtps_destroy(void *arg, dtrace_id_t id, void *parg)
   *
   * 1.11.1 Overview
   *
   *   Called to destroy the specified probe.
   *
   * 1.11.2 Arguments and notes
   *
   *   The first argument is the cookie as passed to dtrace_register().  The
   *   second argument is the identifier of the probe to be destroyed.  The third
   *   argument is the probe argument as passed to dtrace_probe_create().  The
   *   provider should free all state associated with the probe.  The framework
   *   guarantees that dtps_destroy() is only called for probes that have either
   *   been disabled via dtps_disable() or were never enabled via dtps_enable().
   *   Once dtps_disable() has been called for a probe, no further call will be
   *   made specifying the probe.
   *
   * 1.11.3 Return value
   *
   *   None.
   *
   * 1.11.4 Caller's context
   *
   *   The DTrace framework is locked in such a way that it may not be called
   *   back into at all.  mod_lock is held.  cpu_lock is not held, and may not be
   *   acquired.
   *
   *
   * 2 Provider-to-Framework API
   *
   * 2.1  Overview
   *
   * The Provider-to-Framework API provides the mechanism for the provider to
   * register itself with the DTrace framework, to create probes, to lookup
   * probes and (most importantly) to fire probes.  The Provider-to-Framework
   * consists of:
   *
   *   dtrace_register()       <-- Register a provider with the DTrace framework
   *   dtrace_unregister()     <-- Remove a provider's DTrace registration
   *   dtrace_invalidate()     <-- Invalidate the specified provider
   *   dtrace_condense()       <-- Remove a provider's unenabled probes
   *   dtrace_attached()       <-- Indicates whether or not DTrace has attached
   *   dtrace_probe_create()   <-- Create a DTrace probe
   *   dtrace_probe_lookup()   <-- Lookup a DTrace probe based on its name
   *   dtrace_probe_arg()      <-- Return the probe argument for a specific probe
   *   dtrace_probe()          <-- Fire the specified probe
   *
   * 2.2  int dtrace_register(const char *name, const dtrace_pattr_t *pap,
   *          uint32_t priv, cred_t *cr, const dtrace_pops_t *pops, void *arg,
   *          dtrace_provider_id_t *idp)
   *
   * 2.2.1  Overview
   *
   *   dtrace_register() registers the calling provider with the DTrace
   *   framework.  It should generally be called by DTrace providers in their
   *   attach(9E) entry point.
   *
   * 2.2.2  Arguments and Notes
   *
   *   The first argument is the name of the provider.  The second argument is a
   *   pointer to the stability attributes for the provider.  The third argument
   *   is the privilege flags for the provider, and must be some combination of:
   *
   *     DTRACE_PRIV_NONE     <= All users may enable probes from this provider
   *
   *     DTRACE_PRIV_PROC     <= Any user with privilege of PRIV_DTRACE_PROC may
   *                             enable probes from this provider
   *
   *     DTRACE_PRIV_USER     <= Any user with privilege of PRIV_DTRACE_USER may
   *                             enable probes from this provider
   *
   *     DTRACE_PRIV_KERNEL   <= Any user with privilege of PRIV_DTRACE_KERNEL
   *                             may enable probes from this provider
   *
   *     DTRACE_PRIV_OWNER    <= This flag places an additional constraint on
   *                             the privilege requirements above. These probes
   *                             require either (a) a user ID matching the user
   *                             ID of the cred passed in the fourth argument
   *                             or (b) the PRIV_PROC_OWNER privilege.
   *
   *     DTRACE_PRIV_ZONEOWNER<= This flag places an additional constraint on
   *                             the privilege requirements above. These probes
   *                             require either (a) a zone ID matching the zone
   *                             ID of the cred passed in the fourth argument
   *                             or (b) the PRIV_PROC_ZONE privilege.
   *
   *   Note that these flags designate the _visibility_ of the probes, not
   *   the conditions under which they may or may not fire.
   *
   *   The fourth argument is the credential that is associated with the
   *   provider.  This argument should be NULL if the privilege flags don't
   *   include DTRACE_PRIV_OWNER or DTRACE_PRIV_ZONEOWNER.  If non-NULL, the
   *   framework stashes the uid and zoneid represented by this credential
   *   for use at probe-time, in implicit predicates.  These limit visibility
   *   of the probes to users and/or zones which have sufficient privilege to
   *   access them.
   *
   *   The fifth argument is a DTrace provider operations vector, which provides
   *   the implementation for the Framework-to-Provider API.  (See Section 1,
   *   above.)  This must be non-NULL, and each member must be non-NULL.  The
   *   exceptions to this are (1) the dtps_provide() and dtps_provide_module()
   *   members (if the provider so desires, _one_ of these members may be left
   *   NULL -- denoting that the provider only implements the other) and (2)
   *   the dtps_suspend() and dtps_resume() members, which must either both be
   *   NULL or both be non-NULL.
   *
   *   The sixth argument is a cookie to be specified as the first argument for
   *   each function in the Framework-to-Provider API.  This argument may have
   *   any value.
   *
   *   The final argument is a pointer to dtrace_provider_id_t.  If
   *   dtrace_register() successfully completes, the provider identifier will be
   *   stored in the memory pointed to be this argument.  This argument must be
   *   non-NULL.
   *
   * 2.2.3  Return value
   *
   *   On success, dtrace_register() returns 0 and stores the new provider's
   *   identifier into the memory pointed to by the idp argument.  On failure,
   *   dtrace_register() returns an errno:
   *
   *     EINVAL   The arguments passed to dtrace_register() were somehow invalid.
   *              This may because a parameter that must be non-NULL was NULL,
   *              because the name was invalid (either empty or an illegal
   *              provider name) or because the attributes were invalid.
   *
   *   No other failure code is returned.
   *
   * 2.2.4  Caller's context
   *
   *   dtrace_register() may induce calls to dtrace_provide(); the provider must
   *   hold no locks across dtrace_register() that may also be acquired by
   *   dtrace_provide().  cpu_lock and mod_lock must not be held.
   *
   * 2.3  int dtrace_unregister(dtrace_provider_t id)
   *
   * 2.3.1  Overview
   *
   *   Unregisters the specified provider from the DTrace framework.  It should
   *   generally be called by DTrace providers in their detach(9E) entry point.
   *
   * 2.3.2  Arguments and Notes
   *
   *   The only argument is the provider identifier, as returned from a
   *   successful call to dtrace_register().  As a result of calling
   *   dtrace_unregister(), the DTrace framework will call back into the provider
   *   via the dtps_destroy() entry point.  Once dtrace_unregister() successfully
   *   completes, however, the DTrace framework will no longer make calls through
   *   the Framework-to-Provider API.
   *
   * 2.3.3  Return value
   *
   *   On success, dtrace_unregister returns 0.  On failure, dtrace_unregister()
   *   returns an errno:
   *
   *     EBUSY    There are currently processes that have the DTrace pseudodevice
   *              open, or there exists an anonymous enabling that hasn't yet
   *              been claimed.
   *
   *   No other failure code is returned.
   *
   * 2.3.4  Caller's context
   *
   *   Because a call to dtrace_unregister() may induce calls through the
   *   Framework-to-Provider API, the caller may not hold any lock across
   *   dtrace_register() that is also acquired in any of the Framework-to-
   *   Provider API functions.  Additionally, mod_lock may not be held.
   *
   * 2.4  void dtrace_invalidate(dtrace_provider_id_t id)
   *
   * 2.4.1  Overview
   *
   *   Invalidates the specified provider.  All subsequent probe lookups for the
   *   specified provider will fail, but its probes will not be removed.
   *
   * 2.4.2  Arguments and note
   *
   *   The only argument is the provider identifier, as returned from a
   *   successful call to dtrace_register().  In general, a provider's probes
   *   always remain valid; dtrace_invalidate() is a mechanism for invalidating
   *   an entire provider, regardless of whether or not probes are enabled or
   *   not.  Note that dtrace_invalidate() will _not_ prevent already enabled
   *   probes from firing -- it will merely prevent any new enablings of the
   *   provider's probes.
   *
   * 2.5 int dtrace_condense(dtrace_provider_id_t id)
   *
   * 2.5.1  Overview
   *
   *   Removes all the unenabled probes for the given provider. This function is
   *   not unlike dtrace_unregister(), except that it doesn't remove the
   *   provider just as many of its associated probes as it can.
   *
   * 2.5.2  Arguments and Notes
   *
   *   As with dtrace_unregister(), the sole argument is the provider identifier
   *   as returned from a successful call to dtrace_register().  As a result of
   *   calling dtrace_condense(), the DTrace framework will call back into the
   *   given provider's dtps_destroy() entry point for each of the provider's
   *   unenabled probes.
   *
   * 2.5.3  Return value
   *
   *   Currently, dtrace_condense() always returns 0.  However, consumers of this
   *   function should check the return value as appropriate; its behavior may
   *   change in the future.
   *
   * 2.5.4  Caller's context
   *
   *   As with dtrace_unregister(), the caller may not hold any lock across
   *   dtrace_condense() that is also acquired in the provider's entry points.
   *   Also, mod_lock may not be held.
   *
   * 2.6 int dtrace_attached()
   *
   * 2.6.1  Overview
   *
   *   Indicates whether or not DTrace has attached.
   *
   * 2.6.2  Arguments and Notes
   *
   *   For most providers, DTrace makes initial contact beyond registration.
   *   That is, once a provider has registered with DTrace, it waits to hear
   *   from DTrace to create probes.  However, some providers may wish to
   *   proactively create probes without first being told by DTrace to do so.
   *   If providers wish to do this, they must first call dtrace_attached() to
   *   determine if DTrace itself has attached.  If dtrace_attached() returns 0,
   *   the provider must not make any other Provider-to-Framework API call.
   *
   * 2.6.3  Return value
   *
   *   dtrace_attached() returns 1 if DTrace has attached, 0 otherwise.
   *
   * 2.7  int dtrace_probe_create(dtrace_provider_t id, const char *mod,
   *          const char *func, const char *name, int aframes, void *arg)
   *
   * 2.7.1  Overview
   *
   *   Creates a probe with specified module name, function name, and name.
   *
   * 2.7.2  Arguments and Notes
   *
   *   The first argument is the provider identifier, as returned from a
   *   successful call to dtrace_register().  The second, third, and fourth
   *   arguments are the module name, function name, and probe name,
   *   respectively.  Of these, module name and function name may both be NULL
   *   (in which case the probe is considered to be unanchored), or they may both
   *   be non-NULL.  The name must be non-NULL, and must point to a non-empty
   *   string.
   *
   *   The fifth argument is the number of artificial stack frames that will be
   *   found on the stack when dtrace_probe() is called for the new probe.  These
   *   artificial frames will be automatically be pruned should the stack() or
   *   stackdepth() functions be called as part of one of the probe's ECBs.  If
   *   the parameter doesn't add an artificial frame, this parameter should be
   *   zero.
   *
   *   The final argument is a probe argument that will be passed back to the
   *   provider when a probe-specific operation is called.  (e.g., via
   *   dtps_enable(), dtps_disable(), etc.)
   *
   *   Note that it is up to the provider to be sure that the probe that it
   *   creates does not already exist -- if the provider is unsure of the probe's
   *   existence, it should assure its absence with dtrace_probe_lookup() before
   *   calling dtrace_probe_create().
   *
   * 2.7.3  Return value
   *
   *   dtrace_probe_create() always succeeds, and always returns the identifier
   *   of the newly-created probe.
   *
   * 2.7.4  Caller's context
   *
   *   While dtrace_probe_create() is generally expected to be called from
   *   dtps_provide() and/or dtps_provide_module(), it may be called from other
   *   non-DTrace contexts.  Neither cpu_lock nor mod_lock may be held.
   *
   * 2.8  dtrace_id_t dtrace_probe_lookup(dtrace_provider_t id, const char *mod,
   *          const char *func, const char *name)
   *
   * 2.8.1  Overview
   *
   *   Looks up a probe based on provdider and one or more of module name,
   *   function name and probe name.
   *
   * 2.8.2  Arguments and Notes
   *
   *   The first argument is the provider identifier, as returned from a
   *   successful call to dtrace_register().  The second, third, and fourth
   *   arguments are the module name, function name, and probe name,
   *   respectively.  Any of these may be NULL; dtrace_probe_lookup() will return
   *   the identifier of the first probe that is provided by the specified
   *   provider and matches all of the non-NULL matching criteria.
   *   dtrace_probe_lookup() is generally used by a provider to be check the
   *   existence of a probe before creating it with dtrace_probe_create().
   *
   * 2.8.3  Return value
   *
   *   If the probe exists, returns its identifier.  If the probe does not exist,
   *   return DTRACE_IDNONE.
   *
   * 2.8.4  Caller's context
   *
   *   While dtrace_probe_lookup() is generally expected to be called from
   *   dtps_provide() and/or dtps_provide_module(), it may also be called from
   *   other non-DTrace contexts.  Neither cpu_lock nor mod_lock may be held.
   *
   * 2.9  void *dtrace_probe_arg(dtrace_provider_t id, dtrace_id_t probe)
   *
   * 2.9.1  Overview
   *
   *   Returns the probe argument associated with the specified probe.
   *
   * 2.9.2  Arguments and Notes
   *
   *   The first argument is the provider identifier, as returned from a
   *   successful call to dtrace_register().  The second argument is a probe
   *   identifier, as returned from dtrace_probe_lookup() or
   *   dtrace_probe_create().  This is useful if a probe has multiple
   *   provider-specific components to it:  the provider can create the probe
   *   once with provider-specific state, and then add to the state by looking
   *   up the probe based on probe identifier.
   *
   * 2.9.3  Return value
   *
   *   Returns the argument associated with the specified probe.  If the
   *   specified probe does not exist, or if the specified probe is not provided
   *   by the specified provider, NULL is returned.
   *
   * 2.9.4  Caller's context
   *
   *   While dtrace_probe_arg() is generally expected to be called from
   *   dtps_provide() and/or dtps_provide_module(), it may also be called from
   *   other non-DTrace contexts.  Neither cpu_lock nor mod_lock may be held.
   *
   * 2.10  void dtrace_probe(dtrace_id_t probe, uintptr_t arg0, uintptr_t arg1,
   *              uintptr_t arg2, uintptr_t arg3, uintptr_t arg4)
   *
   * 2.10.1  Overview
   *
   *   The epicenter of DTrace:  fires the specified probes with the specified
   *   arguments.
   *
   * 2.10.2  Arguments and Notes
   *
   *   The first argument is a probe identifier as returned by
   *   dtrace_probe_create() or dtrace_probe_lookup().  The second through sixth
   *   arguments are the values to which the D variables "arg0" through "arg4"
   *   will be mapped.
   *
   *   dtrace_probe() should be called whenever the specified probe has fired --
   *   however the provider defines it.
   *
   * 2.10.3  Return value
   *
   *   None.
   *
   * 2.10.4  Caller's context
   *
   *   dtrace_probe() may be called in virtually any context:  kernel, user,
   *   interrupt, high-level interrupt, with arbitrary adaptive locks held, with
   *   dispatcher locks held, with interrupts disabled, etc.  The only latitude
   *   that must be afforded to DTrace is the ability to make calls within
   *   itself (and to its in-kernel subroutines) and the ability to access
   *   arbitrary (but mapped) memory.  On some platforms, this constrains
   *   context.  For example, on UltraSPARC, dtrace_probe() cannot be called
   *   from any context in which TL is greater than zero.  dtrace_probe() may
   *   also not be called from any routine which may be called by dtrace_probe()
   *   -- which includes functions in the DTrace framework and some in-kernel
   *   DTrace subroutines.  All such functions "dtrace_"; providers that
   *   instrument the kernel arbitrarily should be sure to not instrument these
   *   routines.
   */
  typedef struct dtrace_pops {
          void (*dtps_provide)(void *arg, dtrace_probedesc_t *spec);
          void (*dtps_provide_module)(void *arg, modctl_t *mp);
          void (*dtps_enable)(void *arg, dtrace_id_t id, void *parg);
          void (*dtps_disable)(void *arg, dtrace_id_t id, void *parg);
          void (*dtps_suspend)(void *arg, dtrace_id_t id, void *parg);
          void (*dtps_resume)(void *arg, dtrace_id_t id, void *parg);
          void (*dtps_getargdesc)(void *arg, dtrace_id_t id, void *parg,
              dtrace_argdesc_t *desc);
          uint64_t (*dtps_getargval)(void *arg, dtrace_id_t id, void *parg,
              int argno, int aframes);
          int (*dtps_usermode)(void *arg, dtrace_id_t id, void *parg);
          void (*dtps_destroy)(void *arg, dtrace_id_t id, void *parg);
  } dtrace_pops_t;
  
  #define DTRACE_MODE_KERNEL                      0x01
  #define DTRACE_MODE_USER                        0x02
  #define DTRACE_MODE_NOPRIV_DROP                 0x10
  #define DTRACE_MODE_NOPRIV_RESTRICT             0x20
  #define DTRACE_MODE_LIMITEDPRIV_RESTRICT        0x40
  
  typedef uintptr_t       dtrace_provider_id_t;
  
  extern int dtrace_register(const char *, const dtrace_pattr_t *, uint32_t,
      cred_t *, const dtrace_pops_t *, void *, dtrace_provider_id_t *);
  extern int dtrace_unregister(dtrace_provider_id_t);
  extern int dtrace_condense(dtrace_provider_id_t);
  extern void dtrace_invalidate(dtrace_provider_id_t);
  extern dtrace_id_t dtrace_probe_lookup(dtrace_provider_id_t, char *,
      char *, char *);
  extern dtrace_id_t dtrace_probe_create(dtrace_provider_id_t, const char *,
      const char *, const char *, int, void *);
  extern void *dtrace_probe_arg(dtrace_provider_id_t, dtrace_id_t);
  extern void dtrace_probe(dtrace_id_t, uintptr_t arg0, uintptr_t arg1,
      uintptr_t arg2, uintptr_t arg3, uintptr_t arg4);
  
  /*
   * DTrace Meta Provider API
   *
   * The following functions are implemented by the DTrace framework and are
   * used to implement meta providers. Meta providers plug into the DTrace
   * framework and are used to instantiate new providers on the fly. At
   * present, there is only one type of meta provider and only one meta
   * provider may be registered with the DTrace framework at a time. The
   * sole meta provider type provides user-land static tracing facilities
   * by taking meta probe descriptions and adding a corresponding provider
   * into the DTrace framework.
   *
   * 1 Framework-to-Provider
   *
   * 1.1 Overview
   *
   * The Framework-to-Provider API is represented by the dtrace_mops structure
   * that the meta provider passes to the framework when registering itself as
   * a meta provider. This structure consists of the following members:
   *
   *   dtms_create_probe()        <-- Add a new probe to a created provider
   *   dtms_provide_pid()         <-- Create a new provider for a given process
   *   dtms_remove_pid()          <-- Remove a previously created provider
   *
   * 1.2  void dtms_create_probe(void *arg, void *parg,
   *           dtrace_helper_probedesc_t *probedesc);
   *
   * 1.2.1  Overview
   *
   *   Called by the DTrace framework to create a new probe in a provider
   *   created by this meta provider.
   *
   * 1.2.2  Arguments and notes
   *
   *   The first argument is the cookie as passed to dtrace_meta_register().
   *   The second argument is the provider cookie for the associated provider;
   *   this is obtained from the return value of dtms_provide_pid(). The third
   *   argument is the helper probe description.
   *
   * 1.2.3  Return value
   *
   *   None
   *
   * 1.2.4  Caller's context
   *
   *   dtms_create_probe() is called from either ioctl() or module load context
   *   in the context of a newly-created provider (that is, a provider that
   *   is a result of a call to dtms_provide_pid()). The DTrace framework is
   *   locked in such a way that meta providers may not register or unregister,
   *   such that no other thread can call into a meta provider operation and that
   *   atomicity is assured with respect to meta provider operations across
   *   dtms_provide_pid() and subsequent calls to dtms_create_probe().
   *   The context is thus effectively single-threaded with respect to the meta
   *   provider, and that the meta provider cannot call dtrace_meta_register()
   *   or dtrace_meta_unregister(). However, the context is such that the
   *   provider may (and is expected to) call provider-related DTrace provider
   *   APIs including dtrace_probe_create().
   *
   * 1.3  void *dtms_provide_pid(void *arg, dtrace_meta_provider_t *mprov,
   *            pid_t pid)
   *
   * 1.3.1  Overview
   *
   *   Called by the DTrace framework to instantiate a new provider given the
   *   description of the provider and probes in the mprov argument. The
   *   meta provider should call dtrace_register() to insert the new provider
   *   into the DTrace framework.
   *
   * 1.3.2  Arguments and notes
   *
   *   The first argument is the cookie as passed to dtrace_meta_register().
   *   The second argument is a pointer to a structure describing the new
   *   helper provider. The third argument is the process identifier for
   *   process associated with this new provider. Note that the name of the
   *   provider as passed to dtrace_register() should be the contatenation of
   *   the dtmpb_provname member of the mprov argument and the processs
   *   identifier as a string.
   *
   * 1.3.3  Return value
   *
   *   The cookie for the provider that the meta provider creates. This is
   *   the same value that it passed to dtrace_register().
   *
   * 1.3.4  Caller's context
   *
   *   dtms_provide_pid() is called from either ioctl() or module load context.
   *   The DTrace framework is locked in such a way that meta providers may not
   *   register or unregister. This means that the meta provider cannot call
   *   dtrace_meta_register() or dtrace_meta_unregister(). However, the context
   *   is such that the provider may -- and is expected to --  call
   *   provider-related DTrace provider APIs including dtrace_register().
   *
   * 1.4  void dtms_remove_pid(void *arg, dtrace_meta_provider_t *mprov,
   *           pid_t pid)
   *
   * 1.4.1  Overview
   *
   *   Called by the DTrace framework to remove a provider that had previously
   *   been instantiated via the dtms_provide_pid() entry point. The meta
   *   provider need not remove the provider immediately, but this entry
   *   point indicates that the provider should be removed as soon as possible
   *   using the dtrace_unregister() API.
   *
   * 1.4.2  Arguments and notes
   *
   *   The first argument is the cookie as passed to dtrace_meta_register().
   *   The second argument is a pointer to a structure describing the helper
   *   provider. The third argument is the process identifier for process
   *   associated with this new provider.
   *
   * 1.4.3  Return value
   *
   *   None
   *
   * 1.4.4  Caller's context
   *
   *   dtms_remove_pid() is called from either ioctl() or exit() context.
   *   The DTrace framework is locked in such a way that meta providers may not
   *   register or unregister. This means that the meta provider cannot call
   *   dtrace_meta_register() or dtrace_meta_unregister(). However, the context
   *   is such that the provider may -- and is expected to -- call
   *   provider-related DTrace provider APIs including dtrace_unregister().
   */
  typedef struct dtrace_helper_probedesc {
          char *dthpb_mod;                        /* probe module */
          char *dthpb_func;                       /* probe function */
          char *dthpb_name;                       /* probe name */
          uint64_t dthpb_base;                    /* base address */
          uint32_t *dthpb_offs;                   /* offsets array */
          uint32_t *dthpb_enoffs;                 /* is-enabled offsets array */
          uint32_t dthpb_noffs;                   /* offsets count */
          uint32_t dthpb_nenoffs;                 /* is-enabled offsets count */
          uint8_t *dthpb_args;                    /* argument mapping array */
          uint8_t dthpb_xargc;                    /* translated argument count */
          uint8_t dthpb_nargc;                    /* native argument count */
          char *dthpb_xtypes;                     /* translated types strings */
          char *dthpb_ntypes;                     /* native types strings */
  } dtrace_helper_probedesc_t;
  
  typedef struct dtrace_helper_provdesc {
          char *dthpv_provname;                   /* provider name */
          dtrace_pattr_t dthpv_pattr;             /* stability attributes */
  } dtrace_helper_provdesc_t;
  
  typedef struct dtrace_mops {
          void (*dtms_create_probe)(void *, void *, dtrace_helper_probedesc_t *);
          void *(*dtms_provide_pid)(void *, dtrace_helper_provdesc_t *, pid_t);
          void (*dtms_remove_pid)(void *, dtrace_helper_provdesc_t *, pid_t);
  } dtrace_mops_t;
  
  typedef uintptr_t       dtrace_meta_provider_id_t;
  
  extern int dtrace_meta_register(const char *, const dtrace_mops_t *, void *,
      dtrace_meta_provider_id_t *);
  extern int dtrace_meta_unregister(dtrace_meta_provider_id_t);
  
  /*
   * DTrace Kernel Hooks
   *
   * The following functions are implemented by the base kernel and form a set of
   * hooks used by the DTrace framework.  DTrace hooks are implemented in either
   * uts/common/os/dtrace_subr.c, an ISA-specific assembly file, or in a
   * uts/<platform>/os/dtrace_subr.c corresponding to each hardware platform.
   */
  
  typedef enum dtrace_vtime_state {
          DTRACE_VTIME_INACTIVE = 0,      /* No DTrace, no TNF */
          DTRACE_VTIME_ACTIVE,            /* DTrace virtual time, no TNF */
          DTRACE_VTIME_INACTIVE_TNF,      /* No DTrace, TNF active */
          DTRACE_VTIME_ACTIVE_TNF         /* DTrace virtual time _and_ TNF */
  } dtrace_vtime_state_t;
  
  #ifdef illumos
  extern dtrace_vtime_state_t dtrace_vtime_active;
  #endif
  extern void dtrace_vtime_switch(kthread_t *next);
  extern void dtrace_vtime_enable_tnf(void);
  extern void dtrace_vtime_disable_tnf(void);
  extern void dtrace_vtime_enable(void);
  extern void dtrace_vtime_disable(void);
  
  struct regs;
  struct reg;
  
  #ifdef illumos
  extern int (*dtrace_pid_probe_ptr)(struct reg *);
  extern int (*dtrace_return_probe_ptr)(struct reg *);
  extern void (*dtrace_fasttrap_fork_ptr)(proc_t *, proc_t *);
  extern void (*dtrace_fasttrap_exec_ptr)(proc_t *);
  extern void (*dtrace_fasttrap_exit_ptr)(proc_t *);
  extern void dtrace_fasttrap_fork(proc_t *, proc_t *);
  #endif
  
  typedef uintptr_t dtrace_icookie_t;
  typedef void (*dtrace_xcall_t)(void *);
  
  extern dtrace_icookie_t dtrace_interrupt_disable(void);
  extern void dtrace_interrupt_enable(dtrace_icookie_t);
  
  extern void dtrace_membar_producer(void);
  extern void dtrace_membar_consumer(void);
  
  extern void (*dtrace_cpu_init)(processorid_t);
  #ifdef illumos
  extern void (*dtrace_modload)(modctl_t *);
  extern void (*dtrace_modunload)(modctl_t *);
  #endif
  extern void (*dtrace_helpers_cleanup)(void);
  extern void (*dtrace_helpers_fork)(proc_t *parent, proc_t *child);
  extern void (*dtrace_cpustart_init)(void);
  extern void (*dtrace_cpustart_fini)(void);
  extern void (*dtrace_closef)(void);
  
  extern void (*dtrace_debugger_init)(void);
  extern void (*dtrace_debugger_fini)(void);
  extern dtrace_cacheid_t dtrace_predcache_id;
  
  #ifdef illumos
  extern hrtime_t dtrace_gethrtime(void);
  #else
  void dtrace_debug_printf(const char *, ...) __printflike(1, 2);
  #endif
  extern void dtrace_sync(void);
  extern void dtrace_toxic_ranges(void (*)(uintptr_t, uintptr_t));
  extern void dtrace_xcall(processorid_t, dtrace_xcall_t, void *);
  extern void dtrace_vpanic(const char *, __va_list);
  extern void dtrace_panic(const char *, ...);
  
  extern int dtrace_safe_defer_signal(void);
  extern void dtrace_safe_synchronous_signal(void);
  
  extern int dtrace_mach_aframes(void);
  
  #if defined(__i386) || defined(__amd64)
  extern int dtrace_instr_size(uchar_t *instr);
  extern int dtrace_instr_size_isa(uchar_t *, model_t, int *);
  extern void dtrace_invop_callsite(void);
  #endif
  extern void dtrace_invop_add(int (*)(uintptr_t, struct trapframe *, uintptr_t));
  extern void dtrace_invop_remove(int (*)(uintptr_t, struct trapframe *,
      uintptr_t));
  
  #ifdef __sparc
  extern int dtrace_blksuword32(uintptr_t, uint32_t *, int);
  extern void dtrace_getfsr(uint64_t *);
  #endif
  
  #ifndef illumos
  extern void dtrace_helpers_duplicate(proc_t *, proc_t *);
  extern void dtrace_helpers_destroy(proc_t *);
  #endif
  
  #define DTRACE_CPUFLAG_ISSET(flag) \
          (cpu_core[curcpu].cpuc_dtrace_flags & (flag))
  
  #define DTRACE_CPUFLAG_SET(flag) \
          (cpu_core[curcpu].cpuc_dtrace_flags |= (flag))
  
  #define DTRACE_CPUFLAG_CLEAR(flag) \
          (cpu_core[curcpu].cpuc_dtrace_flags &= ~(flag))
  
  #endif /* _KERNEL */
  
  #endif  /* _ASM */
  
  #if defined(__i386) || defined(__amd64)
  
  #define DTRACE_INVOP_PUSHL_EBP          1
  #define DTRACE_INVOP_PUSHQ_RBP          DTRACE_INVOP_PUSHL_EBP
  #define DTRACE_INVOP_POPL_EBP           2
  #define DTRACE_INVOP_POPQ_RBP           DTRACE_INVOP_POPL_EBP
  #define DTRACE_INVOP_LEAVE              3
  #define DTRACE_INVOP_NOP                4
  #define DTRACE_INVOP_RET                5
  
  #if defined(__amd64)
  #define DTRACE_INVOP_CALL               6
  #endif
  
  #elif defined(__powerpc__)
  
  #define DTRACE_INVOP_BCTR       1
  #define DTRACE_INVOP_BLR        2
  #define DTRACE_INVOP_JUMP       3
  #define DTRACE_INVOP_MFLR_R0    4
  #define DTRACE_INVOP_NOP        5
  
  #elif defined(__arm__)
  
  #define DTRACE_INVOP_SHIFT      4
  #define DTRACE_INVOP_MASK       ((1 << DTRACE_INVOP_SHIFT) - 1)
  #define DTRACE_INVOP_DATA(x)    ((x) >> DTRACE_INVOP_SHIFT)
  
  #define DTRACE_INVOP_PUSHM      1
  #define DTRACE_INVOP_POPM       2
  #define DTRACE_INVOP_B          3
  
  #elif defined(__aarch64__)
  
  #define INSN_SIZE       4
  
  #define B_MASK          0xff000000
  #define B_DATA_MASK     0x00ffffff
  #define B_INSTR         0x14000000
  
  #define BTI_MASK        0xffffff3f
  #define BTI_INSTR       0xd503241f
  
  #define NOP_INSTR       0xd503201f
  
  #define RET_INSTR       0xd65f03c0
  
  #define SUB_MASK        0xffc00000
  #define SUB_INSTR       0xd1000000
  #define SUB_RD_SHIFT    0
  #define SUB_RN_SHIFT    5
  #define SUB_R_MASK      0x1f
  #define SUB_IMM_SHIFT   10
  #define SUB_IMM_MASK    0xfff
  
  #define LDP_STP_MASK    0xffc00000
  #define STP_32          0x29800000
  #define STP_64          0xa9800000
  #define LDP_32          0x28c00000
  #define LDP_64          0xa8c00000
  #define LDP_STP_PREIND  (1 << 24)
  #define LDP_STP_DIR     (1 << 22) /* Load instruction */
  #define ARG1_SHIFT      0
  #define ARG1_MASK       0x1f
  #define ARG2_SHIFT      10
  #define ARG2_MASK       0x1f
  #define ADDR_SHIFT      5
  #define ADDR_MASK       0x1f
  #define OFFSET_SHIFT    15
  #define OFFSET_SIZE     7
  #define OFFSET_MASK     ((1 << OFFSET_SIZE) - 1)
  
  #define DTRACE_INVOP_STP        1
  #define DTRACE_INVOP_RET        2
  #define DTRACE_INVOP_B          3
  #define DTRACE_INVOP_SUB        4
  
  #elif defined(__mips__)
  
  #define INSN_SIZE               4
  
  /* Load/Store double RA to/from SP */
  #define LDSD_RA_SP_MASK         0xffff0000
  #define LDSD_DATA_MASK          0x0000ffff
  #define SD_RA_SP                0xffbf0000
  #define LD_RA_SP                0xdfbf0000
  
  #define DTRACE_INVOP_SD         1
  #define DTRACE_INVOP_LD         2
  
  #elif defined(__riscv)
  
  #define DTRACE_INVOP_SD         1
  #define DTRACE_INVOP_C_SDSP     2
  #define DTRACE_INVOP_RET        3
  #define DTRACE_INVOP_C_RET      4
  #define DTRACE_INVOP_NOP        5
  
  #endif
  
  #ifdef  __cplusplus
  }
  #endif
  
  #endif  /* _SYS_DTRACE_H */

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