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e91b87a368
binutils-gdb/gdb/i386-pinsn.c
gdb-3.1 e91b87a368 gdb-3.1
2012-06-03 15:36:31 +01:00

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/* Print i386 instructions for GDB, the GNU debugger.
Copyright (C) 1988 Free Software Foundation, Inc.
GDB is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY. No author or distributor accepts responsibility to anyone
for the consequences of using it or for whether it serves any
particular purpose or works at all, unless he says so in writing.
Refer to the GDB General Public License for full details.
Everyone is granted permission to copy, modify and redistribute GDB,
but only under the conditions described in the GDB General Public
License. A copy of this license is supposed to have been given to you
along with GDB so you can know your rights and responsibilities. It
should be in a file named COPYING. Among other things, the copyright
notice and this notice must be preserved on all copies.
In other words, go ahead and share GDB, but don't try to stop
anyone else from sharing it farther. Help stamp out software hoarding!
*/
/*
* 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 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 start_pc;
/*
* 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, outbuf)
int pc;
unsigned char *inbuf;
char *outbuf;
{
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;
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 */
oappend ("fwait");
strcpy (outbuf, obuf);
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;
if (dp->op1)
(*dp->op1)(dp->bytemode1);
obufp = op2out;
if (dp->op2)
(*dp->op2)(dp->bytemode2);
obufp = op3out;
if (dp->op3)
(*dp->op3)(dp->bytemode3);
}
obufp = obuf + strlen (obuf);
for (i = strlen (obuf); i < 6; i++)
oappend (" ");
oappend (" ");
/* 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;
}
else
{
first = op3out;
second = op2out;
third = op1out;
}
needcomma = 0;
if (*first)
{
oappend (first);
needcomma = 1;
}
if (*second)
{
if (needcomma)
oappend (",");
oappend (second);
needcomma = 1;
}
if (*third)
{
if (needcomma)
oappend (",");
oappend (third);
}
strcpy (outbuf, obuf);
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;
}
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);
}
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 disassembelr error>");
return;
}
sprintf (scratchbuf, "0x%x",
(start_pc + codep - start_codep + disp) & mask);
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 ();
sprintf (scratchbuf, "0x%x",
start_pc + codep - start_codep + 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"
#define MAXLEN 20
print_insn (memaddr, stream)
CORE_ADDR memaddr;
FILE *stream;
{
unsigned char buffer[MAXLEN];
/* should be expanded if disassembler prints symbol names */
char outbuf[100];
int n;
read_memory (memaddr, buffer, MAXLEN);
n = i386dis ((int)memaddr, buffer, outbuf);
fputs (outbuf, stream);
return (n);
}
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