The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/i386/include/asmacros.h

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /* -*- mode: asm -*- */
    2 /*-
    3  * SPDX-License-Identifier: BSD-3-Clause
    4  *
    5  * Copyright (c) 1993 The Regents of the University of California.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  * $FreeBSD: releng/12.0/sys/i386/include/asmacros.h 334520 2018-06-02 04:25:09Z bde $
   33  */
   34 
   35 #ifndef _MACHINE_ASMACROS_H_
   36 #define _MACHINE_ASMACROS_H_
   37 
   38 #include <sys/cdefs.h>
   39 
   40 /* XXX too much duplication in various asm*.h's. */
   41 
   42 /*
   43  * CNAME is used to manage the relationship between symbol names in C
   44  * and the equivalent assembly language names.  CNAME is given a name as
   45  * it would be used in a C program.  It expands to the equivalent assembly
   46  * language name.
   47  */
   48 #define CNAME(csym)             csym
   49 
   50 #define ALIGN_DATA      .p2align 2      /* 4 byte alignment, zero filled */
   51 #ifdef GPROF
   52 #define ALIGN_TEXT      .p2align 4,0x90 /* 16-byte alignment, nop filled */
   53 #else
   54 #define ALIGN_TEXT      .p2align 2,0x90 /* 4-byte alignment, nop filled */
   55 #endif
   56 #define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
   57 
   58 #define GEN_ENTRY(name)         ALIGN_TEXT; .globl CNAME(name); \
   59                                 .type CNAME(name),@function; CNAME(name):
   60 #define NON_GPROF_ENTRY(name)   GEN_ENTRY(name)
   61 #define NON_GPROF_RET           .byte 0xc3      /* opcode for `ret' */
   62 
   63 #define END(name)               .size name, . - name
   64 
   65 #ifdef GPROF
   66 /*
   67  * __mcount is like [.]mcount except that doesn't require its caller to set
   68  * up a frame pointer.  It must be called before pushing anything onto the
   69  * stack.  gcc should eventually generate code to call __mcount in most
   70  * cases.  This would make -pg in combination with -fomit-frame-pointer
   71  * useful.  gcc has a configuration variable PROFILE_BEFORE_PROLOGUE to
   72  * allow profiling before setting up the frame pointer, but this is
   73  * inadequate for good handling of special cases, e.g., -fpic works best
   74  * with profiling after the prologue.
   75  *
   76  * [.]mexitcount is a new function to support non-statistical profiling if an
   77  * accurate clock is available.  For C sources, calls to it are generated
   78  * by the FreeBSD extension `-mprofiler-epilogue' to gcc.  It is best to
   79  * call [.]mexitcount at the end of a function like the MEXITCOUNT macro does,
   80  * but gcc currently generates calls to it at the start of the epilogue to
   81  * avoid problems with -fpic.
   82  *
   83  * [.]mcount and __mcount may clobber the call-used registers and %ef.
   84  * [.]mexitcount may clobber %ecx and %ef.
   85  *
   86  * Cross-jumping makes non-statistical profiling timing more complicated.
   87  * It is handled in many cases by calling [.]mexitcount before jumping.  It
   88  * is handled for conditional jumps using CROSSJUMP() and CROSSJUMP_LABEL().
   89  * It is handled for some fault-handling jumps by not sharing the exit
   90  * routine.
   91  *
   92  * ALTENTRY() must be before a corresponding ENTRY() so that it can jump to
   93  * the main entry point.  Note that alt entries are counted twice.  They
   94  * have to be counted as ordinary entries for gprof to get the call times
   95  * right for the ordinary entries.
   96  *
   97  * High local labels are used in macros to avoid clashes with local labels
   98  * in functions.
   99  *
  100  * Ordinary `ret' is used instead of a macro `RET' because there are a lot
  101  * of `ret's.  0xc3 is the opcode for `ret' (`#define ret ... ret' can't
  102  * be used because this file is sometimes preprocessed in traditional mode).
  103  * `ret' clobbers eflags but this doesn't matter.
  104  */
  105 #define ALTENTRY(name)          GEN_ENTRY(name) ; MCOUNT ; MEXITCOUNT ; jmp 9f
  106 #define CROSSJUMP(jtrue, label, jfalse) \
  107         jfalse 8f; MEXITCOUNT; jmp __CONCAT(to,label); 8:
  108 #define CROSSJUMPTARGET(label) \
  109         ALIGN_TEXT; __CONCAT(to,label): ; MCOUNT; jmp label
  110 #define ENTRY(name)             GEN_ENTRY(name) ; 9: ; MCOUNT
  111 #define FAKE_MCOUNT(caller)     pushl caller ; call *__mcountp ; popl %ecx
  112 #define MCOUNT                  call *__mcountp
  113 #define MCOUNT_LABEL(name)      GEN_ENTRY(name) ; nop ; ALIGN_TEXT
  114 #ifdef GUPROF
  115 #define MEXITCOUNT              call *__mexitcountp
  116 #define ret                     MEXITCOUNT ; NON_GPROF_RET
  117 #else
  118 #define MEXITCOUNT
  119 #endif
  120 
  121 #else /* !GPROF */
  122 /*
  123  * ALTENTRY() has to align because it is before a corresponding ENTRY().
  124  * ENTRY() has to align to because there may be no ALTENTRY() before it.
  125  * If there is a previous ALTENTRY() then the alignment code for ENTRY()
  126  * is empty.
  127  */
  128 #define ALTENTRY(name)          GEN_ENTRY(name)
  129 #define CROSSJUMP(jtrue, label, jfalse) jtrue label
  130 #define CROSSJUMPTARGET(label)
  131 #define ENTRY(name)             GEN_ENTRY(name)
  132 #define FAKE_MCOUNT(caller)
  133 #define MCOUNT
  134 #define MCOUNT_LABEL(name)
  135 #define MEXITCOUNT
  136 #endif /* GPROF */
  137 
  138 #ifdef LOCORE
  139 
  140 #define GSEL_KPL        0x0020  /* GSEL(GCODE_SEL, SEL_KPL) */
  141 #define SEL_RPL_MASK    0x0003
  142 
  143 /*
  144  * Convenience macro for declaring interrupt entry points.
  145  */
  146 #define IDTVEC(name)    ALIGN_TEXT; .globl __CONCAT(X,name); \
  147                         .type __CONCAT(X,name),@function; __CONCAT(X,name):
  148 
  149 /*
  150  * Macros to create and destroy a trap frame.
  151  */
  152         .macro  PUSH_FRAME2
  153         pushal
  154         pushl   $0
  155         movw    %ds,(%esp)
  156         pushl   $0
  157         movw    %es,(%esp)
  158         pushl   $0
  159         movw    %fs,(%esp)
  160         .endm
  161 
  162         .macro  PUSH_FRAME
  163         pushl   $0              /* dummy error code */
  164         pushl   $0              /* dummy trap type */
  165         PUSH_FRAME2
  166         .endm
  167         
  168 /*
  169  * Access per-CPU data.
  170  */
  171 #define PCPU(member)    %fs:PC_ ## member
  172 
  173 #define PCPU_ADDR(member, reg)                                          \
  174         movl %fs:PC_PRVSPACE, reg ;                                     \
  175         addl $PC_ ## member, reg
  176 
  177 /*
  178  * Setup the kernel segment registers.
  179  */
  180         .macro  SET_KERNEL_SREGS
  181         movl    $KDSEL, %eax    /* reload with kernel's data segment */
  182         movl    %eax, %ds
  183         movl    %eax, %es
  184         movl    $KPSEL, %eax    /* reload with per-CPU data segment */
  185         movl    %eax, %fs
  186         .endm
  187 
  188         .macro  NMOVE_STACKS
  189         movl    PCPU(KESP0), %edx
  190         movl    $TF_SZ, %ecx
  191         testl   $PSL_VM, TF_EFLAGS(%esp)
  192         jz      .L\@.1
  193         addl    $VM86_STACK_SPACE, %ecx
  194 .L\@.1: subl    %ecx, %edx
  195         movl    %edx, %edi
  196         movl    %esp, %esi
  197         rep; movsb
  198         movl    %edx, %esp
  199         .endm
  200 
  201         .macro  LOAD_KCR3
  202         call    .L\@.1
  203 .L\@.1: popl    %eax
  204         movl    (tramp_idleptd - .L\@.1)(%eax), %eax
  205         movl    %eax, %cr3
  206         .endm
  207 
  208         .macro  MOVE_STACKS
  209         LOAD_KCR3
  210         NMOVE_STACKS
  211         .endm
  212 
  213         .macro  KENTER
  214         testl   $PSL_VM, TF_EFLAGS(%esp)
  215         jz      .L\@.1
  216         LOAD_KCR3
  217         movl    PCPU(CURPCB), %eax
  218         testl   $PCB_VM86CALL, PCB_FLAGS(%eax)
  219         jnz     .L\@.3
  220         NMOVE_STACKS
  221         movl    $handle_ibrs_entry,%edx
  222         call    *%edx
  223         jmp     .L\@.3
  224 .L\@.1: testb   $SEL_RPL_MASK, TF_CS(%esp)
  225         jz      .L\@.3
  226 .L\@.2: MOVE_STACKS
  227         movl    $handle_ibrs_entry,%edx
  228         call    *%edx
  229 .L\@.3:
  230         .endm
  231 
  232 #endif /* LOCORE */
  233 
  234 #ifdef __STDC__
  235 #define ELFNOTE(name, type, desctype, descdata...) \
  236 .pushsection .note.name                 ;       \
  237   .align 4                              ;       \
  238   .long 2f - 1f         /* namesz */    ;       \
  239   .long 4f - 3f         /* descsz */    ;       \
  240   .long type                            ;       \
  241 1:.asciz #name                          ;       \
  242 2:.align 4                              ;       \
  243 3:desctype descdata                     ;       \
  244 4:.align 4                              ;       \
  245 .popsection
  246 #else /* !__STDC__, i.e. -traditional */
  247 #define ELFNOTE(name, type, desctype, descdata) \
  248 .pushsection .note.name                 ;       \
  249   .align 4                              ;       \
  250   .long 2f - 1f         /* namesz */    ;       \
  251   .long 4f - 3f         /* descsz */    ;       \
  252   .long type                            ;       \
  253 1:.asciz "name"                         ;       \
  254 2:.align 4                              ;       \
  255 3:desctype descdata                     ;       \
  256 4:.align 4                              ;       \
  257 .popsection
  258 #endif /* __STDC__ */
  259 
  260 #endif /* !_MACHINE_ASMACROS_H_ */

Cache object: 179b21c282931981b94b1bc99dee3e97


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.