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binutils-gdb/gdb/i386-pinsn.c
K. Richard Pixley dd3b648e8b Johns release
1991-03-28 16:28:29 +00:00

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/* Print i386 instructions for GDB, the GNU debugger.
Copyright (C) 1988, 1989 Free Software Foundation, Inc.
This file is part of GDB.
GDB is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.
GDB is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GDB; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/*
* 80386 instruction printer by Pace Willisson (pace@prep.ai.mit.edu)
* July 1988
*/
/*
* The main tables describing the instructions is essentially a copy
* of the "Opcode Map" chapter (Appendix A) of the Intel 80386
* Programmers Manual. Usually, there is a capital letter, followed
* by a small letter. The capital letter tell the addressing mode,
* and the small letter tells about the operand size. Refer to
* the Intel manual for details.
*/
#include <stdio.h>
#include <ctype.h>
#define Eb OP_E, b_mode
#define indirEb OP_indirE, b_mode
#define Gb OP_G, b_mode
#define Ev OP_E, v_mode
#define indirEv OP_indirE, v_mode
#define Ew OP_E, w_mode
#define Ma OP_E, v_mode
#define M OP_E, 0
#define Mp OP_E, 0 /* ? */
#define Gv OP_G, v_mode
#define Gw OP_G, w_mode
#define Rw OP_rm, w_mode
#define Rd OP_rm, d_mode
#define Ib OP_I, b_mode
#define sIb OP_sI, b_mode /* sign extened byte */
#define Iv OP_I, v_mode
#define Iw OP_I, w_mode
#define Jb OP_J, b_mode
#define Jv OP_J, v_mode
#define ONE OP_ONE, 0
#define Cd OP_C, d_mode
#define Dd OP_D, d_mode
#define Td OP_T, d_mode
#define eAX OP_REG, eAX_reg
#define eBX OP_REG, eBX_reg
#define eCX OP_REG, eCX_reg
#define eDX OP_REG, eDX_reg
#define eSP OP_REG, eSP_reg
#define eBP OP_REG, eBP_reg
#define eSI OP_REG, eSI_reg
#define eDI OP_REG, eDI_reg
#define AL OP_REG, al_reg
#define CL OP_REG, cl_reg
#define DL OP_REG, dl_reg
#define BL OP_REG, bl_reg
#define AH OP_REG, ah_reg
#define CH OP_REG, ch_reg
#define DH OP_REG, dh_reg
#define BH OP_REG, bh_reg
#define AX OP_REG, ax_reg
#define DX OP_REG, dx_reg
#define indirDX OP_REG, indir_dx_reg
#define Sw OP_SEG, w_mode
#define Ap OP_DIR, lptr
#define Av OP_DIR, v_mode
#define Ob OP_OFF, b_mode
#define Ov OP_OFF, v_mode
#define Xb OP_DSSI, b_mode
#define Xv OP_DSSI, v_mode
#define Yb OP_ESDI, b_mode
#define Yv OP_ESDI, v_mode
#define es OP_REG, es_reg
#define ss OP_REG, ss_reg
#define cs OP_REG, cs_reg
#define ds OP_REG, ds_reg
#define fs OP_REG, fs_reg
#define gs OP_REG, gs_reg
int OP_E(), OP_indirE(), OP_G(), OP_I(), OP_sI(), OP_REG();
int OP_J(), OP_SEG();
int OP_DIR(), OP_OFF(), OP_DSSI(), OP_ESDI(), OP_ONE(), OP_C();
int OP_D(), OP_T(), OP_rm();
#define b_mode 1
#define v_mode 2
#define w_mode 3
#define d_mode 4
#define es_reg 100
#define cs_reg 101
#define ss_reg 102
#define ds_reg 103
#define fs_reg 104
#define gs_reg 105
#define eAX_reg 107
#define eCX_reg 108
#define eDX_reg 109
#define eBX_reg 110
#define eSP_reg 111
#define eBP_reg 112
#define eSI_reg 113
#define eDI_reg 114
#define lptr 115
#define al_reg 116
#define cl_reg 117
#define dl_reg 118
#define bl_reg 119
#define ah_reg 120
#define ch_reg 121
#define dh_reg 122
#define bh_reg 123
#define ax_reg 124
#define cx_reg 125
#define dx_reg 126
#define bx_reg 127
#define sp_reg 128
#define bp_reg 129
#define si_reg 130
#define di_reg 131
#define indir_dx_reg 150
#define GRP1b NULL, NULL, 0
#define GRP1S NULL, NULL, 1
#define GRP1Ss NULL, NULL, 2
#define GRP2b NULL, NULL, 3
#define GRP2S NULL, NULL, 4
#define GRP2b_one NULL, NULL, 5
#define GRP2S_one NULL, NULL, 6
#define GRP2b_cl NULL, NULL, 7
#define GRP2S_cl NULL, NULL, 8
#define GRP3b NULL, NULL, 9
#define GRP3S NULL, NULL, 10
#define GRP4 NULL, NULL, 11
#define GRP5 NULL, NULL, 12
#define GRP6 NULL, NULL, 13
#define GRP7 NULL, NULL, 14
#define GRP8 NULL, NULL, 15
#define FLOATCODE 50
#define FLOAT NULL, NULL, FLOATCODE
struct dis386 {
char *name;
int (*op1)();
int bytemode1;
int (*op2)();
int bytemode2;
int (*op3)();
int bytemode3;
};
struct dis386 dis386[] = {
/* 00 */
{ "addb", Eb, Gb },
{ "addS", Ev, Gv },
{ "addb", Gb, Eb },
{ "addS", Gv, Ev },
{ "addb", AL, Ib },
{ "addS", eAX, Iv },
{ "pushl", es },
{ "popl", es },
/* 08 */
{ "orb", Eb, Gb },
{ "orS", Ev, Gv },
{ "orb", Gb, Eb },
{ "orS", Gv, Ev },
{ "orb", AL, Ib },
{ "orS", eAX, Iv },
{ "pushl", cs },
{ "(bad)" }, /* 0x0f extended opcode escape */
/* 10 */
{ "adcb", Eb, Gb },
{ "adcS", Ev, Gv },
{ "adcb", Gb, Eb },
{ "adcS", Gv, Ev },
{ "adcb", AL, Ib },
{ "adcS", eAX, Iv },
{ "pushl", ss },
{ "popl", ss },
/* 18 */
{ "sbbb", Eb, Gb },
{ "sbbS", Ev, Gv },
{ "sbbb", Gb, Eb },
{ "sbbS", Gv, Ev },
{ "sbbb", AL, Ib },
{ "sbbS", eAX, Iv },
{ "pushl", ds },
{ "popl", ds },
/* 20 */
{ "andb", Eb, Gb },
{ "andS", Ev, Gv },
{ "andb", Gb, Eb },
{ "andS", Gv, Ev },
{ "andb", AL, Ib },
{ "andS", eAX, Iv },
{ "(bad)" }, /* SEG ES prefix */
{ "daa" },
/* 28 */
{ "subb", Eb, Gb },
{ "subS", Ev, Gv },
{ "subb", Gb, Eb },
{ "subS", Gv, Ev },
{ "subb", AL, Ib },
{ "subS", eAX, Iv },
{ "(bad)" }, /* SEG CS prefix */
{ "das" },
/* 30 */
{ "xorb", Eb, Gb },
{ "xorS", Ev, Gv },
{ "xorb", Gb, Eb },
{ "xorS", Gv, Ev },
{ "xorb", AL, Ib },
{ "xorS", eAX, Iv },
{ "(bad)" }, /* SEG SS prefix */
{ "aaa" },
/* 38 */
{ "cmpb", Eb, Gb },
{ "cmpS", Ev, Gv },
{ "cmpb", Gb, Eb },
{ "cmpS", Gv, Ev },
{ "cmpb", AL, Ib },
{ "cmpS", eAX, Iv },
{ "(bad)" }, /* SEG DS prefix */
{ "aas" },
/* 40 */
{ "incS", eAX },
{ "incS", eCX },
{ "incS", eDX },
{ "incS", eBX },
{ "incS", eSP },
{ "incS", eBP },
{ "incS", eSI },
{ "incS", eDI },
/* 48 */
{ "decS", eAX },
{ "decS", eCX },
{ "decS", eDX },
{ "decS", eBX },
{ "decS", eSP },
{ "decS", eBP },
{ "decS", eSI },
{ "decS", eDI },
/* 50 */
{ "pushS", eAX },
{ "pushS", eCX },
{ "pushS", eDX },
{ "pushS", eBX },
{ "pushS", eSP },
{ "pushS", eBP },
{ "pushS", eSI },
{ "pushS", eDI },
/* 58 */
{ "popS", eAX },
{ "popS", eCX },
{ "popS", eDX },
{ "popS", eBX },
{ "popS", eSP },
{ "popS", eBP },
{ "popS", eSI },
{ "popS", eDI },
/* 60 */
{ "pusha" },
{ "popa" },
{ "boundS", Gv, Ma },
{ "arpl", Ew, Gw },
{ "(bad)" }, /* seg fs */
{ "(bad)" }, /* seg gs */
{ "(bad)" }, /* op size prefix */
{ "(bad)" }, /* adr size prefix */
/* 68 */
{ "pushS", Iv }, /* 386 book wrong */
{ "imulS", Gv, Ev, Iv },
{ "pushl", sIb }, /* push of byte really pushes 4 bytes */
{ "imulS", Gv, Ev, Ib },
{ "insb", Yb, indirDX },
{ "insS", Yv, indirDX },
{ "outsb", indirDX, Xb },
{ "outsS", indirDX, Xv },
/* 70 */
{ "jo", Jb },
{ "jno", Jb },
{ "jb", Jb },
{ "jae", Jb },
{ "je", Jb },
{ "jne", Jb },
{ "jbe", Jb },
{ "ja", Jb },
/* 78 */
{ "js", Jb },
{ "jns", Jb },
{ "jp", Jb },
{ "jnp", Jb },
{ "jl", Jb },
{ "jnl", Jb },
{ "jle", Jb },
{ "jg", Jb },
/* 80 */
{ GRP1b },
{ GRP1S },
{ "(bad)" },
{ GRP1Ss },
{ "testb", Eb, Gb },
{ "testS", Ev, Gv },
{ "xchgb", Eb, Gb },
{ "xchgS", Ev, Gv },
/* 88 */
{ "movb", Eb, Gb },
{ "movS", Ev, Gv },
{ "movb", Gb, Eb },
{ "movS", Gv, Ev },
{ "movw", Ew, Sw },
{ "leaS", Gv, M },
{ "movw", Sw, Ew },
{ "popS", Ev },
/* 90 */
{ "nop" },
{ "xchgS", eCX, eAX },
{ "xchgS", eDX, eAX },
{ "xchgS", eBX, eAX },
{ "xchgS", eSP, eAX },
{ "xchgS", eBP, eAX },
{ "xchgS", eSI, eAX },
{ "xchgS", eDI, eAX },
/* 98 */
{ "cwtl" },
{ "cltd" },
{ "lcall", Ap },
{ "(bad)" }, /* fwait */
{ "pushf" },
{ "popf" },
{ "sahf" },
{ "lahf" },
/* a0 */
{ "movb", AL, Ob },
{ "movS", eAX, Ov },
{ "movb", Ob, AL },
{ "movS", Ov, eAX },
{ "movsb", Yb, Xb },
{ "movsS", Yv, Xv },
{ "cmpsb", Yb, Xb },
{ "cmpsS", Yv, Xv },
/* a8 */
{ "testb", AL, Ib },
{ "testS", eAX, Iv },
{ "stosb", Yb, AL },
{ "stosS", Yv, eAX },
{ "lodsb", AL, Xb },
{ "lodsS", eAX, Xv },
{ "scasb", AL, Xb },
{ "scasS", eAX, Xv },
/* b0 */
{ "movb", AL, Ib },
{ "movb", CL, Ib },
{ "movb", DL, Ib },
{ "movb", BL, Ib },
{ "movb", AH, Ib },
{ "movb", CH, Ib },
{ "movb", DH, Ib },
{ "movb", BH, Ib },
/* b8 */
{ "movS", eAX, Iv },
{ "movS", eCX, Iv },
{ "movS", eDX, Iv },
{ "movS", eBX, Iv },
{ "movS", eSP, Iv },
{ "movS", eBP, Iv },
{ "movS", eSI, Iv },
{ "movS", eDI, Iv },
/* c0 */
{ GRP2b },
{ GRP2S },
{ "ret", Iw },
{ "ret" },
{ "lesS", Gv, Mp },
{ "ldsS", Gv, Mp },
{ "movb", Eb, Ib },
{ "movS", Ev, Iv },
/* c8 */
{ "enter", Iw, Ib },
{ "leave" },
{ "lret", Iw },
{ "lret" },
{ "int3" },
{ "int", Ib },
{ "into" },
{ "iret" },
/* d0 */
{ GRP2b_one },
{ GRP2S_one },
{ GRP2b_cl },
{ GRP2S_cl },
{ "aam", Ib },
{ "aad", Ib },
{ "(bad)" },
{ "xlat" },
/* d8 */
{ FLOAT },
{ FLOAT },
{ FLOAT },
{ FLOAT },
{ FLOAT },
{ FLOAT },
{ FLOAT },
{ FLOAT },
/* e0 */
{ "loopne", Jb },
{ "loope", Jb },
{ "loop", Jb },
{ "jCcxz", Jb },
{ "inb", AL, Ib },
{ "inS", eAX, Ib },
{ "outb", Ib, AL },
{ "outS", Ib, eAX },
/* e8 */
{ "call", Av },
{ "jmp", Jv },
{ "ljmp", Ap },
{ "jmp", Jb },
{ "inb", AL, indirDX },
{ "inS", eAX, indirDX },
{ "outb", indirDX, AL },
{ "outS", indirDX, eAX },
/* f0 */
{ "(bad)" }, /* lock prefix */
{ "(bad)" },
{ "(bad)" }, /* repne */
{ "(bad)" }, /* repz */
{ "hlt" },
{ "cmc" },
{ GRP3b },
{ GRP3S },
/* f8 */
{ "clc" },
{ "stc" },
{ "cli" },
{ "sti" },
{ "cld" },
{ "std" },
{ GRP4 },
{ GRP5 },
};
struct dis386 dis386_twobyte[] = {
/* 00 */
{ GRP6 },
{ GRP7 },
{ "larS", Gv, Ew },
{ "lslS", Gv, Ew },
{ "(bad)" },
{ "(bad)" },
{ "clts" },
{ "(bad)" },
/* 08 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* 10 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* 18 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* 20 */
/* these are all backward in appendix A of the intel book */
{ "movl", Rd, Cd },
{ "movl", Rd, Dd },
{ "movl", Cd, Rd },
{ "movl", Dd, Rd },
{ "movl", Rd, Td },
{ "(bad)" },
{ "movl", Td, Rd },
{ "(bad)" },
/* 28 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* 30 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* 38 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* 40 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* 48 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* 50 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* 58 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* 60 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* 68 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* 70 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* 78 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* 80 */
{ "jo", Jv },
{ "jno", Jv },
{ "jb", Jv },
{ "jae", Jv },
{ "je", Jv },
{ "jne", Jv },
{ "jbe", Jv },
{ "ja", Jv },
/* 88 */
{ "js", Jv },
{ "jns", Jv },
{ "jp", Jv },
{ "jnp", Jv },
{ "jl", Jv },
{ "jge", Jv },
{ "jle", Jv },
{ "jg", Jv },
/* 90 */
{ "seto", Eb },
{ "setno", Eb },
{ "setb", Eb },
{ "setae", Eb },
{ "sete", Eb },
{ "setne", Eb },
{ "setbe", Eb },
{ "seta", Eb },
/* 98 */
{ "sets", Eb },
{ "setns", Eb },
{ "setp", Eb },
{ "setnp", Eb },
{ "setl", Eb },
{ "setge", Eb },
{ "setle", Eb },
{ "setg", Eb },
/* a0 */
{ "pushl", fs },
{ "popl", fs },
{ "(bad)" },
{ "btS", Ev, Gv },
{ "shldS", Ev, Gv, Ib },
{ "shldS", Ev, Gv, CL },
{ "(bad)" },
{ "(bad)" },
/* a8 */
{ "pushl", gs },
{ "popl", gs },
{ "(bad)" },
{ "btsS", Ev, Gv },
{ "shrdS", Ev, Gv, Ib },
{ "shrdS", Ev, Gv, CL },
{ "(bad)" },
{ "imulS", Gv, Ev },
/* b0 */
{ "(bad)" },
{ "(bad)" },
{ "lssS", Gv, Mp }, /* 386 lists only Mp */
{ "btrS", Ev, Gv },
{ "lfsS", Gv, Mp }, /* 386 lists only Mp */
{ "lgsS", Gv, Mp }, /* 386 lists only Mp */
{ "movzbS", Gv, Eb },
{ "movzwS", Gv, Ew },
/* b8 */
{ "(bad)" },
{ "(bad)" },
{ GRP8 },
{ "btcS", Ev, Gv },
{ "bsfS", Gv, Ev },
{ "bsrS", Gv, Ev },
{ "movsbS", Gv, Eb },
{ "movswS", Gv, Ew },
/* c0 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* c8 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* d0 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* d8 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* e0 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* e8 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* f0 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
/* f8 */
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
{ "(bad)" }, { "(bad)" }, { "(bad)" }, { "(bad)" },
};
static char obuf[100];
static char *obufp;
static char scratchbuf[100];
static unsigned char *start_codep;
static unsigned char *codep;
static int mod;
static int rm;
static int reg;
static void oappend ();
static char *names32[]={
"%eax","%ecx","%edx","%ebx", "%esp","%ebp","%esi","%edi",
};
static char *names16[] = {
"%ax","%cx","%dx","%bx","%sp","%bp","%si","%di",
};
static char *names8[] = {
"%al","%cl","%dl","%bl","%ah","%ch","%dh","%bh",
};
static char *names_seg[] = {
"%es","%cs","%ss","%ds","%fs","%gs","%?","%?",
};
struct dis386 grps[][8] = {
/* GRP1b */
{
{ "addb", Eb, Ib },
{ "orb", Eb, Ib },
{ "adcb", Eb, Ib },
{ "sbbb", Eb, Ib },
{ "andb", Eb, Ib },
{ "subb", Eb, Ib },
{ "xorb", Eb, Ib },
{ "cmpb", Eb, Ib }
},
/* GRP1S */
{
{ "addS", Ev, Iv },
{ "orS", Ev, Iv },
{ "adcS", Ev, Iv },
{ "sbbS", Ev, Iv },
{ "andS", Ev, Iv },
{ "subS", Ev, Iv },
{ "xorS", Ev, Iv },
{ "cmpS", Ev, Iv }
},
/* GRP1Ss */
{
{ "addS", Ev, sIb },
{ "orS", Ev, sIb },
{ "adcS", Ev, sIb },
{ "sbbS", Ev, sIb },
{ "andS", Ev, sIb },
{ "subS", Ev, sIb },
{ "xorS", Ev, sIb },
{ "cmpS", Ev, sIb }
},
/* GRP2b */
{
{ "rolb", Eb, Ib },
{ "rorb", Eb, Ib },
{ "rclb", Eb, Ib },
{ "rcrb", Eb, Ib },
{ "shlb", Eb, Ib },
{ "shrb", Eb, Ib },
{ "(bad)" },
{ "sarb", Eb, Ib },
},
/* GRP2S */
{
{ "rolS", Ev, Ib },
{ "rorS", Ev, Ib },
{ "rclS", Ev, Ib },
{ "rcrS", Ev, Ib },
{ "shlS", Ev, Ib },
{ "shrS", Ev, Ib },
{ "(bad)" },
{ "sarS", Ev, Ib },
},
/* GRP2b_one */
{
{ "rolb", Eb },
{ "rorb", Eb },
{ "rclb", Eb },
{ "rcrb", Eb },
{ "shlb", Eb },
{ "shrb", Eb },
{ "(bad)" },
{ "sarb", Eb },
},
/* GRP2S_one */
{
{ "rolS", Ev },
{ "rorS", Ev },
{ "rclS", Ev },
{ "rcrS", Ev },
{ "shlS", Ev },
{ "shrS", Ev },
{ "(bad)" },
{ "sarS", Ev },
},
/* GRP2b_cl */
{
{ "rolb", Eb, CL },
{ "rorb", Eb, CL },
{ "rclb", Eb, CL },
{ "rcrb", Eb, CL },
{ "shlb", Eb, CL },
{ "shrb", Eb, CL },
{ "(bad)" },
{ "sarb", Eb, CL },
},
/* GRP2S_cl */
{
{ "rolS", Ev, CL },
{ "rorS", Ev, CL },
{ "rclS", Ev, CL },
{ "rcrS", Ev, CL },
{ "shlS", Ev, CL },
{ "shrS", Ev, CL },
{ "(bad)" },
{ "sarS", Ev, CL }
},
/* GRP3b */
{
{ "testb", Eb, Ib },
{ "(bad)", Eb },
{ "notb", Eb },
{ "negb", Eb },
{ "mulb", AL, Eb },
{ "imulb", AL, Eb },
{ "divb", AL, Eb },
{ "idivb", AL, Eb }
},
/* GRP3S */
{
{ "testS", Ev, Iv },
{ "(bad)" },
{ "notS", Ev },
{ "negS", Ev },
{ "mulS", eAX, Ev },
{ "imulS", eAX, Ev },
{ "divS", eAX, Ev },
{ "idivS", eAX, Ev },
},
/* GRP4 */
{
{ "incb", Eb },
{ "decb", Eb },
{ "(bad)" },
{ "(bad)" },
{ "(bad)" },
{ "(bad)" },
{ "(bad)" },
{ "(bad)" },
},
/* GRP5 */
{
{ "incS", Ev },
{ "decS", Ev },
{ "call", indirEv },
{ "lcall", indirEv },
{ "jmp", indirEv },
{ "ljmp", indirEv },
{ "pushS", Ev },
{ "(bad)" },
},
/* GRP6 */
{
{ "sldt", Ew },
{ "str", Ew },
{ "lldt", Ew },
{ "ltr", Ew },
{ "verr", Ew },
{ "verw", Ew },
{ "(bad)" },
{ "(bad)" }
},
/* GRP7 */
{
{ "sgdt", Ew },
{ "sidt", Ew },
{ "lgdt", Ew },
{ "lidt", Ew },
{ "smsw", Ew },
{ "(bad)" },
{ "lmsw", Ew },
{ "(bad)" },
},
/* GRP8 */
{
{ "(bad)" },
{ "(bad)" },
{ "(bad)" },
{ "(bad)" },
{ "btS", Ev, Ib },
{ "btsS", Ev, Ib },
{ "btrS", Ev, Ib },
{ "btcS", Ev, Ib },
}
};
#define PREFIX_REPZ 1
#define PREFIX_REPNZ 2
#define PREFIX_LOCK 4
#define PREFIX_CS 8
#define PREFIX_SS 0x10
#define PREFIX_DS 0x20
#define PREFIX_ES 0x40
#define PREFIX_FS 0x80
#define PREFIX_GS 0x100
#define PREFIX_DATA 0x200
#define PREFIX_ADR 0x400
#define PREFIX_FWAIT 0x800
static int prefixes;
ckprefix ()
{
prefixes = 0;
while (1)
{
switch (*codep)
{
case 0xf3:
prefixes |= PREFIX_REPZ;
break;
case 0xf2:
prefixes |= PREFIX_REPNZ;
break;
case 0xf0:
prefixes |= PREFIX_LOCK;
break;
case 0x2e:
prefixes |= PREFIX_CS;
break;
case 0x36:
prefixes |= PREFIX_SS;
break;
case 0x3e:
prefixes |= PREFIX_DS;
break;
case 0x26:
prefixes |= PREFIX_ES;
break;
case 0x64:
prefixes |= PREFIX_FS;
break;
case 0x65:
prefixes |= PREFIX_GS;
break;
case 0x66:
prefixes |= PREFIX_DATA;
break;
case 0x67:
prefixes |= PREFIX_ADR;
break;
case 0x9b:
prefixes |= PREFIX_FWAIT;
break;
default:
return;
}
codep++;
}
}
static int dflag;
static int aflag;
static char op1out[100], op2out[100], op3out[100];
static int op_address[3], op_ad, op_index[3];
static int start_pc;
extern void fputs_filtered ();
/*
* disassemble the first instruction in 'inbuf'. You have to make
* sure all of the bytes of the instruction are filled in.
* On the 386's of 1988, the maximum length of an instruction is 15 bytes.
* (see topic "Redundant prefixes" in the "Differences from 8086"
* section of the "Virtual 8086 Mode" chapter.)
* 'pc' should be the address of this instruction, it will
* be used to print the target address if this is a relative jump or call
* 'outbuf' gets filled in with the disassembled instruction. it should
* be long enough to hold the longest disassembled instruction.
* 100 bytes is certainly enough, unless symbol printing is added later
* The function returns the length of this instruction in bytes.
*/
i386dis (pc, inbuf, stream)
int pc;
unsigned char *inbuf;
FILE *stream;
{
struct dis386 *dp;
char *p;
int i;
int enter_instruction;
char *first, *second, *third;
int needcomma;
obuf[0] = 0;
op1out[0] = 0;
op2out[0] = 0;
op3out[0] = 0;
op_index[0] = op_index[1] = op_index[2] = -1;
start_pc = pc;
start_codep = inbuf;
codep = inbuf;
ckprefix ();
if (*codep == 0xc8)
enter_instruction = 1;
else
enter_instruction = 0;
obufp = obuf;
if (prefixes & PREFIX_REPZ)
oappend ("repz ");
if (prefixes & PREFIX_REPNZ)
oappend ("repnz ");
if (prefixes & PREFIX_LOCK)
oappend ("lock ");
if ((prefixes & PREFIX_FWAIT)
&& ((*codep < 0xd8) || (*codep > 0xdf)))
{
/* fwait not followed by floating point instruction */
fputs_filtered ("fwait", stream);
return (1);
}
/* these would be initialized to 0 if disassembling for 8086 or 286 */
dflag = 1;
aflag = 1;
if (prefixes & PREFIX_DATA)
dflag ^= 1;
if (prefixes & PREFIX_ADR)
{
aflag ^= 1;
oappend ("addr16 ");
}
if (*codep == 0x0f)
dp = &dis386_twobyte[*++codep];
else
dp = &dis386[*codep];
codep++;
mod = (*codep >> 6) & 3;
reg = (*codep >> 3) & 7;
rm = *codep & 7;
if (dp->name == NULL && dp->bytemode1 == FLOATCODE)
{
dofloat ();
}
else
{
if (dp->name == NULL)
dp = &grps[dp->bytemode1][reg];
putop (dp->name);
obufp = op1out;
op_ad = 2;
if (dp->op1)
(*dp->op1)(dp->bytemode1);
obufp = op2out;
op_ad = 1;
if (dp->op2)
(*dp->op2)(dp->bytemode2);
obufp = op3out;
op_ad = 0;
if (dp->op3)
(*dp->op3)(dp->bytemode3);
}
obufp = obuf + strlen (obuf);
for (i = strlen (obuf); i < 6; i++)
oappend (" ");
oappend (" ");
fputs_filtered (obuf, stream);
/* enter instruction is printed with operands in the
* same order as the intel book; everything else
* is printed in reverse order
*/
if (enter_instruction)
{
first = op1out;
second = op2out;
third = op3out;
op_ad = op_index[0];
op_index[0] = op_index[2];
op_index[2] = op_ad;
}
else
{
first = op3out;
second = op2out;
third = op1out;
}
needcomma = 0;
if (*first)
{
if (op_index[0] != -1)
print_address (op_address[op_index[0]], stream);
else
fputs_filtered (first, stream);
needcomma = 1;
}
if (*second)
{
if (needcomma)
fputs_filtered (",", stream);
if (op_index[1] != -1)
print_address (op_address[op_index[1]], stream);
else
fputs_filtered (second, stream);
needcomma = 1;
}
if (*third)
{
if (needcomma)
fputs_filtered (",", stream);
if (op_index[2] != -1)
print_address (op_address[op_index[2]], stream);
else
fputs_filtered (third, stream);
}
return (codep - inbuf);
}
char *float_mem[] = {
/* d8 */
"fadds",
"fmuls",
"fcoms",
"fcomps",
"fsubs",
"fsubrs",
"fdivs",
"fdivrs",
/* d9 */
"flds",
"(bad)",
"fsts",
"fstps",
"fldenv",
"fldcw",
"fNstenv",
"fNstcw",
/* da */
"fiaddl",
"fimull",
"ficoml",
"ficompl",
"fisubl",
"fisubrl",
"fidivl",
"fidivrl",
/* db */
"fildl",
"(bad)",
"fistl",
"fistpl",
"(bad)",
"fldt",
"(bad)",
"fstpt",
/* dc */
"faddl",
"fmull",
"fcoml",
"fcompl",
"fsubl",
"fsubrl",
"fdivl",
"fdivrl",
/* dd */
"fldl",
"(bad)",
"fstl",
"fstpl",
"frstor",
"(bad)",
"fNsave",
"fNstsw",
/* de */
"fiadd",
"fimul",
"ficom",
"ficomp",
"fisub",
"fisubr",
"fidiv",
"fidivr",
/* df */
"fild",
"(bad)",
"fist",
"fistp",
"fbld",
"fildll",
"fbstp",
"fistpll",
};
#define ST OP_ST, 0
#define STi OP_STi, 0
int OP_ST(), OP_STi();
#define FGRPd9_2 NULL, NULL, 0
#define FGRPd9_4 NULL, NULL, 1
#define FGRPd9_5 NULL, NULL, 2
#define FGRPd9_6 NULL, NULL, 3
#define FGRPd9_7 NULL, NULL, 4
#define FGRPda_5 NULL, NULL, 5
#define FGRPdb_4 NULL, NULL, 6
#define FGRPde_3 NULL, NULL, 7
#define FGRPdf_4 NULL, NULL, 8
struct dis386 float_reg[][8] = {
/* d8 */
{
{ "fadd", ST, STi },
{ "fmul", ST, STi },
{ "fcom", STi },
{ "fcomp", STi },
{ "fsub", ST, STi },
{ "fsubr", ST, STi },
{ "fdiv", ST, STi },
{ "fdivr", ST, STi },
},
/* d9 */
{
{ "fld", STi },
{ "fxch", STi },
{ FGRPd9_2 },
{ "(bad)" },
{ FGRPd9_4 },
{ FGRPd9_5 },
{ FGRPd9_6 },
{ FGRPd9_7 },
},
/* da */
{
{ "(bad)" },
{ "(bad)" },
{ "(bad)" },
{ "(bad)" },
{ "(bad)" },
{ FGRPda_5 },
{ "(bad)" },
{ "(bad)" },
},
/* db */
{
{ "(bad)" },
{ "(bad)" },
{ "(bad)" },
{ "(bad)" },
{ FGRPdb_4 },
{ "(bad)" },
{ "(bad)" },
{ "(bad)" },
},
/* dc */
{
{ "fadd", STi, ST },
{ "fmul", STi, ST },
{ "(bad)" },
{ "(bad)" },
{ "fsub", STi, ST },
{ "fsubr", STi, ST },
{ "fdiv", STi, ST },
{ "fdivr", STi, ST },
},
/* dd */
{
{ "ffree", STi },
{ "(bad)" },
{ "fst", STi },
{ "fstp", STi },
{ "fucom", STi },
{ "fucomp", STi },
{ "(bad)" },
{ "(bad)" },
},
/* de */
{
{ "faddp", STi, ST },
{ "fmulp", STi, ST },
{ "(bad)" },
{ FGRPde_3 },
{ "fsubp", STi, ST },
{ "fsubrp", STi, ST },
{ "fdivp", STi, ST },
{ "fdivrp", STi, ST },
},
/* df */
{
{ "(bad)" },
{ "(bad)" },
{ "(bad)" },
{ "(bad)" },
{ FGRPdf_4 },
{ "(bad)" },
{ "(bad)" },
{ "(bad)" },
},
};
char *fgrps[][8] = {
/* d9_2 0 */
{
"fnop","(bad)","(bad)","(bad)","(bad)","(bad)","(bad)","(bad)",
},
/* d9_4 1 */
{
"fchs","fabs","(bad)","(bad)","ftst","fxam","(bad)","(bad)",
},
/* d9_5 2 */
{
"fld1","fldl2t","fldl2e","fldpi","fldlg2","fldln2","fldz","(bad)",
},
/* d9_6 3 */
{
"f2xm1","fyl2x","fptan","fpatan","fxtract","fprem1","fdecstp","fincstp",
},
/* d9_7 4 */
{
"fprem","fyl2xp1","fsqrt","fsincos","frndint","fscale","fsin","fcos",
},
/* da_5 5 */
{
"(bad)","fucompp","(bad)","(bad)","(bad)","(bad)","(bad)","(bad)",
},
/* db_4 6 */
{
"feni(287 only)","fdisi(287 only)","fNclex","fNinit",
"fNsetpm(287 only)","(bad)","(bad)","(bad)",
},
/* de_3 7 */
{
"(bad)","fcompp","(bad)","(bad)","(bad)","(bad)","(bad)","(bad)",
},
/* df_4 8 */
{
"fNstsw","(bad)","(bad)","(bad)","(bad)","(bad)","(bad)","(bad)",
},
};
dofloat ()
{
struct dis386 *dp;
unsigned char floatop;
floatop = codep[-1];
if (mod != 3)
{
putop (float_mem[(floatop - 0xd8) * 8 + reg]);
obufp = op1out;
OP_E (v_mode);
return;
}
codep++;
dp = &float_reg[floatop - 0xd8][reg];
if (dp->name == NULL)
{
putop (fgrps[dp->bytemode1][rm]);
/* instruction fnstsw is only one with strange arg */
if (floatop == 0xdf && *codep == 0xe0)
strcpy (op1out, "%eax");
}
else
{
putop (dp->name);
obufp = op1out;
if (dp->op1)
(*dp->op1)(dp->bytemode1);
obufp = op2out;
if (dp->op2)
(*dp->op2)(dp->bytemode2);
}
}
/* ARGSUSED */
OP_ST (ignore)
{
oappend ("%st");
}
/* ARGSUSED */
OP_STi (ignore)
{
sprintf (scratchbuf, "%%st(%d)", rm);
oappend (scratchbuf);
}
/* capital letters in template are macros */
putop (template)
char *template;
{
char *p;
for (p = template; *p; p++)
{
switch (*p)
{
default:
*obufp++ = *p;
break;
case 'C': /* For jcxz/jecxz */
if (aflag == 0)
*obufp++ = 'e';
break;
case 'N':
if ((prefixes & PREFIX_FWAIT) == 0)
*obufp++ = 'n';
break;
case 'S':
/* operand size flag */
if (dflag)
*obufp++ = 'l';
else
*obufp++ = 'w';
break;
}
}
*obufp = 0;
}
static void
oappend (s)
char *s;
{
strcpy (obufp, s);
obufp += strlen (s);
*obufp = 0;
}
append_prefix ()
{
if (prefixes & PREFIX_CS)
oappend ("%cs:");
if (prefixes & PREFIX_DS)
oappend ("%ds:");
if (prefixes & PREFIX_SS)
oappend ("%ss:");
if (prefixes & PREFIX_ES)
oappend ("%es:");
if (prefixes & PREFIX_FS)
oappend ("%fs:");
if (prefixes & PREFIX_GS)
oappend ("%gs:");
}
OP_indirE (bytemode)
{
oappend ("*");
OP_E (bytemode);
}
OP_E (bytemode)
{
int disp;
int havesib;
int didoutput = 0;
int base;
int index;
int scale;
int havebase;
/* skip mod/rm byte */
codep++;
havesib = 0;
havebase = 0;
disp = 0;
if (mod == 3)
{
switch (bytemode)
{
case b_mode:
oappend (names8[rm]);
break;
case w_mode:
oappend (names16[rm]);
break;
case v_mode:
if (dflag)
oappend (names32[rm]);
else
oappend (names16[rm]);
break;
default:
oappend ("<bad dis table>");
break;
}
return;
}
append_prefix ();
if (rm == 4)
{
havesib = 1;
havebase = 1;
scale = (*codep >> 6) & 3;
index = (*codep >> 3) & 7;
base = *codep & 7;
codep++;
}
switch (mod)
{
case 0:
switch (rm)
{
case 4:
/* implies havesib and havebase */
if (base == 5) {
havebase = 0;
disp = get32 ();
}
break;
case 5:
disp = get32 ();
break;
default:
havebase = 1;
base = rm;
break;
}
break;
case 1:
disp = *(char *)codep++;
if (rm != 4)
{
havebase = 1;
base = rm;
}
break;
case 2:
disp = get32 ();
if (rm != 4)
{
havebase = 1;
base = rm;
}
break;
}
if (mod != 0 || rm == 5 || (havesib && base == 5))
{
sprintf (scratchbuf, "%d", disp);
oappend (scratchbuf);
}
if (havebase || havesib)
{
oappend ("(");
if (havebase)
oappend (names32[base]);
if (havesib)
{
if (index != 4)
{
sprintf (scratchbuf, ",%s", names32[index]);
oappend (scratchbuf);
}
sprintf (scratchbuf, ",%d", 1 << scale);
oappend (scratchbuf);
}
oappend (")");
}
}
OP_G (bytemode)
{
switch (bytemode)
{
case b_mode:
oappend (names8[reg]);
break;
case w_mode:
oappend (names16[reg]);
break;
case d_mode:
oappend (names32[reg]);
break;
case v_mode:
if (dflag)
oappend (names32[reg]);
else
oappend (names16[reg]);
break;
default:
oappend ("<internal disassembler error>");
break;
}
}
get32 ()
{
int x = 0;
x = *codep++ & 0xff;
x |= (*codep++ & 0xff) << 8;
x |= (*codep++ & 0xff) << 16;
x |= (*codep++ & 0xff) << 24;
return (x);
}
get16 ()
{
int x = 0;
x = *codep++ & 0xff;
x |= (*codep++ & 0xff) << 8;
return (x);
}
set_op (op)
int op;
{
op_index[op_ad] = op_ad;
op_address[op_ad] = op;
}
OP_REG (code)
{
char *s;
switch (code)
{
case indir_dx_reg: s = "(%dx)"; break;
case ax_reg: case cx_reg: case dx_reg: case bx_reg:
case sp_reg: case bp_reg: case si_reg: case di_reg:
s = names16[code - ax_reg];
break;
case es_reg: case ss_reg: case cs_reg:
case ds_reg: case fs_reg: case gs_reg:
s = names_seg[code - es_reg];
break;
case al_reg: case ah_reg: case cl_reg: case ch_reg:
case dl_reg: case dh_reg: case bl_reg: case bh_reg:
s = names8[code - al_reg];
break;
case eAX_reg: case eCX_reg: case eDX_reg: case eBX_reg:
case eSP_reg: case eBP_reg: case eSI_reg: case eDI_reg:
if (dflag)
s = names32[code - eAX_reg];
else
s = names16[code - eAX_reg];
break;
default:
s = "<internal disassembler error>";
break;
}
oappend (s);
}
OP_I (bytemode)
{
int op;
switch (bytemode)
{
case b_mode:
op = *codep++ & 0xff;
break;
case v_mode:
if (dflag)
op = get32 ();
else
op = get16 ();
break;
case w_mode:
op = get16 ();
break;
default:
oappend ("<internal disassembler error>");
return;
}
sprintf (scratchbuf, "$0x%x", op);
oappend (scratchbuf);
}
OP_sI (bytemode)
{
int op;
switch (bytemode)
{
case b_mode:
op = *(char *)codep++;
break;
case v_mode:
if (dflag)
op = get32 ();
else
op = (short)get16();
break;
case w_mode:
op = (short)get16 ();
break;
default:
oappend ("<internal disassembler error>");
return;
}
sprintf (scratchbuf, "$0x%x", op);
oappend (scratchbuf);
}
OP_J (bytemode)
{
int disp;
int mask = -1;
switch (bytemode)
{
case b_mode:
disp = *(char *)codep++;
break;
case v_mode:
if (dflag)
disp = get32 ();
else
{
disp = (short)get16 ();
/* for some reason, a data16 prefix on a jump instruction
means that the pc is masked to 16 bits after the
displacement is added! */
mask = 0xffff;
}
break;
default:
oappend ("<internal disassembler error>");
return;
}
disp = (start_pc + codep - start_codep + disp) & mask;
set_op (disp);
sprintf (scratchbuf, "0x%x", disp);
oappend (scratchbuf);
}
/* ARGSUSED */
OP_SEG (dummy)
{
static char *sreg[] = {
"%es","%cs","%ss","%ds","%fs","%gs","%?","%?",
};
oappend (sreg[reg]);
}
OP_DIR (size)
{
int seg, offset;
switch (size)
{
case lptr:
if (aflag)
{
offset = get32 ();
seg = get16 ();
}
else
{
offset = get16 ();
seg = get16 ();
}
sprintf (scratchbuf, "0x%x,0x%x", seg, offset);
oappend (scratchbuf);
break;
case v_mode:
if (aflag)
offset = get32 ();
else
offset = (short)get16 ();
offset = start_pc + codep - start_codep + offset;
set_op (offset);
sprintf (scratchbuf, "0x%x", offset);
oappend (scratchbuf);
break;
default:
oappend ("<internal disassembler error>");
break;
}
}
/* ARGSUSED */
OP_OFF (bytemode)
{
int off;
if (aflag)
off = get32 ();
else
off = get16 ();
sprintf (scratchbuf, "0x%x", off);
oappend (scratchbuf);
}
/* ARGSUSED */
OP_ESDI (dummy)
{
oappend ("%es:(");
oappend (aflag ? "%edi" : "%di");
oappend (")");
}
/* ARGSUSED */
OP_DSSI (dummy)
{
oappend ("%ds:(");
oappend (aflag ? "%esi" : "%si");
oappend (")");
}
/* ARGSUSED */
OP_ONE (dummy)
{
oappend ("1");
}
/* ARGSUSED */
OP_C (dummy)
{
codep++; /* skip mod/rm */
sprintf (scratchbuf, "%%cr%d", reg);
oappend (scratchbuf);
}
/* ARGSUSED */
OP_D (dummy)
{
codep++; /* skip mod/rm */
sprintf (scratchbuf, "%%db%d", reg);
oappend (scratchbuf);
}
/* ARGSUSED */
OP_T (dummy)
{
codep++; /* skip mod/rm */
sprintf (scratchbuf, "%%tr%d", reg);
oappend (scratchbuf);
}
OP_rm (bytemode)
{
switch (bytemode)
{
case d_mode:
oappend (names32[rm]);
break;
case w_mode:
oappend (names16[rm]);
break;
}
}
/* GDB interface */
#include "defs.h"
#include "param.h"
#include "symtab.h"
#include "frame.h"
#include "inferior.h"
#include "gdbcore.h"
#define MAXLEN 20
print_insn (memaddr, stream)
CORE_ADDR memaddr;
FILE *stream;
{
unsigned char buffer[MAXLEN];
read_memory (memaddr, buffer, MAXLEN);
return (i386dis ((int)memaddr, buffer, stream));
}
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