usr.bin/doscmd/register.h

   1 /*
   2 ** Copyright (c) 1996
   3 **      Michael Smith.  All rights reserved.
   4 **
   5 ** Redistribution and use in source and binary forms, with or without
   6 ** modification, are permitted provided that the following conditions
   7 ** are met:
   8 ** 1. Redistributions of source code must retain the above copyright
   9 **    notice, this list of conditions and the following disclaimer.
  10 ** 2. Redistributions in binary form must reproduce the above copyright
  11 **    notice, this list of conditions and the following disclaimer in the
  12 **    documentation and/or other materials provided with the distribution.
  13 **
  14 ** THIS SOFTWARE IS PROVIDED BY Michael Smith ``AS IS'' AND
  15 ** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16 ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17 ** ARE DISCLAIMED.  IN NO EVENT SHALL Michael Smith BE LIABLE
  18 ** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19 ** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20 ** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21 ** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22 ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23 ** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24 ** SUCH DAMAGE.
  25 **
  26 ** $FreeBSD: src/usr.bin/doscmd/register.h,v 1.4 1999/10/08 09:02:38 marcel Exp $
  27 ** $DragonFly: src/usr.bin/doscmd/register.h,v 1.5 2006/11/07 07:57:02 dillon Exp $
  28 */
  29
  30 /******************************************************************************
  31 ** Abstractions to hide register access methods across different platforms.
  32 **
  33 */
  34
  35 #ifndef _CPU_VM86_H_
  36
  37 /* standard register representation */
  38 typedef union
  39 {
  40     u_long      r_ex;
  41     struct
  42     {
  43         u_short r_x;
  44         u_short :16;
  45     } r_w;
  46     struct
  47     {
  48         u_char  r_l;
  49         u_char  r_h;
  50         u_short :16;
  51     } r_b;
  52 } reg86_t;
  53
  54 #endif
  55
  56 #if defined(__DragonFly__)
  57
  58 /* layout must match definition of struct sigcontext in <machine/signal.h> */
  59
  60 typedef struct
  61 {
  62     int         onstack;
  63     reg86_t     gs;
  64     reg86_t     fs;
  65     reg86_t     es;
  66     reg86_t     ds;
  67     reg86_t     edi;
  68     reg86_t     esi;
  69     reg86_t     ebp;
  70     reg86_t     isp;
  71     reg86_t     ebx;
  72     reg86_t     edx;
  73     reg86_t     ecx;
  74     reg86_t     eax;
  75     int         pad[2];
  76     reg86_t     eip;
  77     reg86_t     cs;
  78     reg86_t     efl;
  79     reg86_t     esp;
  80     reg86_t     ss;
  81 } registers_t;
  82
  83 typedef union
  84 {
  85     mcontext_t  sc;
  86     registers_t r;
  87 } regcontext_t;
  88
  89 /*
  90 ** passed around as a reference to the registers.  This must be in
  91 ** scope for the following register macros to work.
  92 */
  93
  94 /* register shorthands */
  95 #define R_ESP           (REGS->r.esp.r_ex)
  96 #define R_SP            (REGS->r.esp.r_w.r_x)
  97 #define R_EBP           (REGS->r.ebp.r_ex)
  98 #define R_BP            (REGS->r.ebp.r_w.r_x)
  99 #define R_ISP           (REGS->r.isp.r_ex)
 100 #define R_EIP           (REGS->r.eip.r_ex)
 101 #define R_IP            (REGS->r.eip.r_w.r_x)
 102 #define R_EFLAGS        (REGS->r.efl.r_ex)
 103 #define R_FLAGS         (REGS->r.efl.r_w.r_x)
 104 #define R_EES           (REGS->r.es.r_ex)
 105 #define R_ES            (REGS->r.es.r_w.r_x)
 106 #define R_EDS           (REGS->r.ds.r_ex)
 107 #define R_DS            (REGS->r.ds.r_w.r_x)
 108 #define R_ECS           (REGS->r.cs.r_ex)
 109 #define R_CS            (REGS->r.cs.r_w.r_x)
 110 #define R_ESS           (REGS->r.ss.r_ex)
 111 #define R_SS            (REGS->r.ss.r_w.r_x)
 112 #define R_EDI           (REGS->r.edi.r_ex)
 113 #define R_DI            (REGS->r.edi.r_w.r_x)
 114 #define R_ESI           (REGS->r.esi.r_ex)
 115 #define R_SI            (REGS->r.esi.r_w.r_x)
 116 #define R_EBX           (REGS->r.ebx.r_ex)
 117 #define R_BX            (REGS->r.ebx.r_w.r_x)
 118 #define R_BL            (REGS->r.ebx.r_b.r_l)
 119 #define R_BH            (REGS->r.ebx.r_b.r_h)
 120 #define R_EDX           (REGS->r.edx.r_ex)
 121 #define R_DX            (REGS->r.edx.r_w.r_x)
 122 #define R_DL            (REGS->r.edx.r_b.r_l)
 123 #define R_DH            (REGS->r.edx.r_b.r_h)
 124 #define R_ECX           (REGS->r.ecx.r_ex)
 125 #define R_CX            (REGS->r.ecx.r_w.r_x)
 126 #define R_CL            (REGS->r.ecx.r_b.r_l)
 127 #define R_CH            (REGS->r.ecx.r_b.r_h)
 128 #define R_EAX           (REGS->r.eax.r_ex)
 129 #define R_AX            (REGS->r.eax.r_w.r_x)
 130 #define R_AL            (REGS->r.eax.r_b.r_l)
 131 #define R_AH            (REGS->r.eax.r_b.r_h)
 132 #define R_EGS           (REGS->r.gs.r_ex)
 133 #define R_GS            (REGS->r.gs.r_w.r_x)
 134 #define R_EFS           (REGS->r.fs.r_ex)
 135 #define R_FS            (REGS->r.fs.r_w.r_x)
 136
 137 #endif
 138
 139 #ifdef __bsdi__
 140 #endif
 141
 142 #ifdef __NetBSD__
 143 #endif
 144
 145 /*
 146 ** register manipulation macros
 147 */
 148
 149 #define PUTVEC(s, o, x) ((s) = ((x) >> 16), (o) = (x) & 0xffff)
 150 #define MAKEVEC(s, o)           (((s) << 16) + (o))
 151
 152 #define PUTPTR(s, o, x) (((s) = ((x) & 0xf0000) >> 4), (o) = (x) & 0xffff)
 153 #define MAKEPTR(s, o)           (((s) << 4) + (o))
 154
 155 #define VECPTR(x)               MAKEPTR((x) >> 16, (x) & 0xffff)
 156
 157 #define REGISTERS               regcontext_t *REGS
 158
 159 inline static void
 160 PUSH(u_short x, REGISTERS)
 161 {
 162     R_SP -= 2;
 163     *(u_short *)MAKEPTR(R_SS, R_SP) = (x);
 164 }
 165
 166 inline static u_short
 167 POP(REGISTERS)
 168 {
 169     u_short     x;
 170
 171     x = *(u_short *)MAKEPTR(R_SS, R_SP);
 172     R_SP += 2;
 173     return(x);
 174 }
 175
 176 # ifndef PSL_ALLCC      /* Grr, FreeBSD doesn't have this */
 177 # define PSL_ALLCC        (PSL_C|PSL_PF|PSL_AF|PSL_Z|PSL_N)
 178 # endif