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

     /*-
      * Copyright (c) 1990 The Regents of the University of California.
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * William Jolitz.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      from: @(#)reg.h 5.5 (Berkeley) 1/18/91
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_REG_H_
    #define _MACHINE_REG_H_
    
    /*
     * Indices for registers in `struct trapframe' and `struct regs'.
     *
     * This interface is deprecated.  In the kernel, it is only used in FPU
     * emulators to convert from register numbers encoded in instructions to
     * register values.  Everything else just accesses the relevant struct
     * members.  In userland, debuggers tend to abuse this interface since
     * they don't understand that `struct regs' is a struct.  I hope they have
     * stopped accessing the registers in the trap frame via PT_{READ,WRITE}_U
     * and we can stop supporting the user area soon.
     */
    #define tFS     (0)
    #define tES     (1)
    #define tDS     (2)
    #define tEDI    (3)
    #define tESI    (4)
    #define tEBP    (5)
    #define tISP    (6)
    #define tEBX    (7)
    #define tEDX    (8)
    #define tECX    (9)
    #define tEAX    (10)
    #define tERR    (12)
    #define tEIP    (13)
    #define tCS     (14)
    #define tEFLAGS (15)
    #define tESP    (16)
    #define tSS     (17)
    
    /*
     * Indices for registers in `struct regs' only.
     *
     * Some registers live in the pcb and are only in an "array" with the
     * other registers in application interfaces that copy all the registers
     * to or from a `struct regs'.
     */
    #define tGS     (18)
    
    /*
     * Register set accessible via /proc/$pid/regs and PT_{SET,GET}REGS.
     */
    struct reg {
            unsigned int    r_fs;
            unsigned int    r_es;
            unsigned int    r_ds;
            unsigned int    r_edi;
            unsigned int    r_esi;
            unsigned int    r_ebp;
            unsigned int    r_isp;
            unsigned int    r_ebx;
            unsigned int    r_edx;
            unsigned int    r_ecx;
            unsigned int    r_eax;
            unsigned int    r_trapno;
            unsigned int    r_err;
            unsigned int    r_eip;
            unsigned int    r_cs;
            unsigned int    r_eflags;
            unsigned int    r_esp;
            unsigned int    r_ss;
            unsigned int    r_gs;
   };
   
   /*
    * Register set accessible via /proc/$pid/fpregs.
    */
   struct fpreg {
           /*
            * XXX should get struct from npx.h.  Here we give a slightly
            * simplified struct.  This may be too much detail.  Perhaps
            * an array of unsigned longs is best.
            */
           unsigned long   fpr_env[7];
           unsigned char   fpr_acc[8][10];
           unsigned long   fpr_ex_sw;
           unsigned char   fpr_pad[64];
   };
   
   struct xmmreg {
           /*
            * XXX should get struct from npx.h.  Here we give a slightly
            * simplified struct.  This may be too much detail.  Perhaps
            * an array of unsigned longs is best.
            */
           unsigned long   xmm_env[8];
           unsigned char   xmm_acc[8][16];
           unsigned char   xmm_reg[8][16];
           unsigned char   xmm_pad[224];
   };
   
   /*
    * Register set accessible via /proc/$pid/dbregs.
    */
   struct dbreg {
           unsigned int  dr[8];    /* debug registers */
                                   /* Index 0-3: debug address registers */
                                   /* Index 4-5: reserved */
                                   /* Index 6: debug status */
                                   /* Index 7: debug control */
   };
   
   #define DBREG_DR7_LOCAL_ENABLE  0x01
   #define DBREG_DR7_GLOBAL_ENABLE 0x02
   #define DBREG_DR7_LEN_1         0x00    /* 1 byte length          */
   #define DBREG_DR7_LEN_2         0x01
   #define DBREG_DR7_LEN_4         0x03
   #define DBREG_DR7_EXEC          0x00    /* break on execute       */
   #define DBREG_DR7_WRONLY        0x01    /* break on write         */
   #define DBREG_DR7_RDWR          0x03    /* break on read or write */
   #define DBREG_DR7_MASK(i)       (0xf << ((i) * 4 + 16) | 0x3 << (i) * 2)
   #define DBREG_DR7_SET(i, len, access, enable)                           \
           (((len) << 2 | (access)) << ((i) * 4 + 16) | (enable) << (i) * 2)
   #define DBREG_DR7_GD            0x2000
   #define DBREG_DR7_ENABLED(d, i) (((d) & 0x3 << (i) * 2) != 0)
   #define DBREG_DR7_ACCESS(d, i)  ((d) >> ((i) * 4 + 16) & 0x3)
   #define DBREG_DR7_LEN(d, i)     ((d) >> ((i) * 4 + 18) & 0x3)
   
   #define DBREG_DRX(d,x)  ((d)->dr[(x)])  /* reference dr0 - dr7 by
                                              register number */
   
   #ifdef _KERNEL
   /*
    * XXX these interfaces are MI, so they should be declared in a MI place.
    */
   int     fill_regs(struct thread *, struct reg *);
   int     set_regs(struct thread *, struct reg *);
   int     fill_fpregs(struct thread *, struct fpreg *);
   int     set_fpregs(struct thread *, struct fpreg *);
   int     fill_dbregs(struct thread *, struct dbreg *);
   int     set_dbregs(struct thread *, struct dbreg *);
   #endif
   
   #endif /* !_MACHINE_REG_H_ */

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