FreeBSD-5.3/sys/i386/i386/db_disasm.c
/*
* Mach Operating System
* Copyright (c) 1991,1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/i386/i386/db_disasm.c,v 1.28 2003/08/25 09:48:46 obrien Exp $");
/*
* Instruction disassembler.
*/
#include <sys/param.h>
#include <ddb/ddb.h>
#include <ddb/db_access.h>
#include <ddb/db_sym.h>
/*
* Size attributes
*/
#define BYTE 0
#define WORD 1
#define LONG 2
#define QUAD 3
#define SNGL 4
#define DBLR 5
#define EXTR 6
#define SDEP 7
#define NONE 8
/*
* Addressing modes
*/
#define E 1 /* general effective address */
#define Eind 2 /* indirect address (jump, call) */
#define Ew 3 /* address, word size */
#define Eb 4 /* address, byte size */
#define R 5 /* register, in 'reg' field */
#define Rw 6 /* word register, in 'reg' field */
#define Ri 7 /* register in instruction */
#define S 8 /* segment reg, in 'reg' field */
#define Si 9 /* segment reg, in instruction */
#define A 10 /* accumulator */
#define BX 11 /* (bx) */
#define CL 12 /* cl, for shifts */
#define DX 13 /* dx, for IO */
#define SI 14 /* si */
#define DI 15 /* di */
#define CR 16 /* control register */
#define DR 17 /* debug register */
#define TR 18 /* test register */
#define I 19 /* immediate, unsigned */
#define Is 20 /* immediate, signed */
#define Ib 21 /* byte immediate, unsigned */
#define Ibs 22 /* byte immediate, signed */
#define Iw 23 /* word immediate, unsigned */
#define O 25 /* direct address */
#define Db 26 /* byte displacement from EIP */
#define Dl 27 /* long displacement from EIP */
#define o1 28 /* constant 1 */
#define o3 29 /* constant 3 */
#define OS 30 /* immediate offset/segment */
#define ST 31 /* FP stack top */
#define STI 32 /* FP stack */
#define X 33 /* extended FP op */
#define XA 34 /* for 'fstcw %ax' */
#define El 35 /* address, long size */
#define Ril 36 /* long register in instruction */
#define Iba 37 /* byte immediate, don't print if 0xa */
struct inst {
const char * i_name; /* name */
short i_has_modrm; /* has regmodrm byte */
short i_size; /* operand size */
int i_mode; /* addressing modes */
const void * i_extra; /* pointer to extra opcode table */
};
#define op1(x) (x)
#define op2(x,y) ((x)|((y)<<8))
#define op3(x,y,z) ((x)|((y)<<8)|((z)<<16))
struct finst {
const char * f_name; /* name for memory instruction */
int f_size; /* size for memory instruction */
int f_rrmode; /* mode for rr instruction */
const void * f_rrname; /* name for rr instruction
(or pointer to table) */
};
static const char * const db_Grp6[] = {
"sldt",
"str",
"lldt",
"ltr",
"verr",
"verw",
"",
""
};
static const char * const db_Grp7[] = {
"sgdt",
"sidt",
"lgdt",
"lidt",
"smsw",
"",
"lmsw",
"invlpg"
};
static const char * const db_Grp8[] = {
"",
"",
"",
"",
"bt",
"bts",
"btr",
"btc"
};
static const char * const db_Grp9[] = {
"",
"cmpxchg8b",
"",
"",
"",
"",
"",
""
};
static const struct inst db_inst_0f0x[] = {
/*00*/ { "", TRUE, NONE, op1(Ew), db_Grp6 },
/*01*/ { "", TRUE, NONE, op1(Ew), db_Grp7 },
/*02*/ { "lar", TRUE, LONG, op2(E,R), 0 },
/*03*/ { "lsl", TRUE, LONG, op2(E,R), 0 },
/*04*/ { "", FALSE, NONE, 0, 0 },
/*05*/ { "", FALSE, NONE, 0, 0 },
/*06*/ { "clts", FALSE, NONE, 0, 0 },
/*07*/ { "", FALSE, NONE, 0, 0 },
/*08*/ { "invd", FALSE, NONE, 0, 0 },
/*09*/ { "wbinvd",FALSE, NONE, 0, 0 },
/*0a*/ { "", FALSE, NONE, 0, 0 },
/*0b*/ { "", FALSE, NONE, 0, 0 },
/*0c*/ { "", FALSE, NONE, 0, 0 },
/*0d*/ { "", FALSE, NONE, 0, 0 },
/*0e*/ { "", FALSE, NONE, 0, 0 },
/*0f*/ { "", FALSE, NONE, 0, 0 },
};
static const struct inst db_inst_0f2x[] = {
/*20*/ { "mov", TRUE, LONG, op2(CR,El), 0 },
/*21*/ { "mov", TRUE, LONG, op2(DR,El), 0 },
/*22*/ { "mov", TRUE, LONG, op2(El,CR), 0 },
/*23*/ { "mov", TRUE, LONG, op2(El,DR), 0 },
/*24*/ { "mov", TRUE, LONG, op2(TR,El), 0 },
/*25*/ { "", FALSE, NONE, 0, 0 },
/*26*/ { "mov", TRUE, LONG, op2(El,TR), 0 },
/*27*/ { "", FALSE, NONE, 0, 0 },
/*28*/ { "", FALSE, NONE, 0, 0 },
/*29*/ { "", FALSE, NONE, 0, 0 },
/*2a*/ { "", FALSE, NONE, 0, 0 },
/*2b*/ { "", FALSE, NONE, 0, 0 },
/*2c*/ { "", FALSE, NONE, 0, 0 },
/*2d*/ { "", FALSE, NONE, 0, 0 },
/*2e*/ { "", FALSE, NONE, 0, 0 },
/*2f*/ { "", FALSE, NONE, 0, 0 },
};
static const struct inst db_inst_0f3x[] = {
/*30*/ { "wrmsr", FALSE, NONE, 0, 0 },
/*31*/ { "rdtsc", FALSE, NONE, 0, 0 },
/*32*/ { "rdmsr", FALSE, NONE, 0, 0 },
/*33*/ { "rdpmc", FALSE, NONE, 0, 0 },
/*34*/ { "", FALSE, NONE, 0, 0 },
/*35*/ { "", FALSE, NONE, 0, 0 },
/*36*/ { "", FALSE, NONE, 0, 0 },
/*37*/ { "", FALSE, NONE, 0, 0 },
/*38*/ { "", FALSE, NONE, 0, 0 },
/*39*/ { "", FALSE, NONE, 0, 0 },
/*3a*/ { "", FALSE, NONE, 0, 0 },
/*3b*/ { "", FALSE, NONE, 0, 0 },
/*3c*/ { "", FALSE, NONE, 0, 0 },
/*3d*/ { "", FALSE, NONE, 0, 0 },
/*3e*/ { "", FALSE, NONE, 0, 0 },
/*3f*/ { "", FALSE, NONE, 0, 0 },
};
static const struct inst db_inst_0f8x[] = {
/*80*/ { "jo", FALSE, NONE, op1(Dl), 0 },
/*81*/ { "jno", FALSE, NONE, op1(Dl), 0 },
/*82*/ { "jb", FALSE, NONE, op1(Dl), 0 },
/*83*/ { "jnb", FALSE, NONE, op1(Dl), 0 },
/*84*/ { "jz", FALSE, NONE, op1(Dl), 0 },
/*85*/ { "jnz", FALSE, NONE, op1(Dl), 0 },
/*86*/ { "jbe", FALSE, NONE, op1(Dl), 0 },
/*87*/ { "jnbe", FALSE, NONE, op1(Dl), 0 },
/*88*/ { "js", FALSE, NONE, op1(Dl), 0 },
/*89*/ { "jns", FALSE, NONE, op1(Dl), 0 },
/*8a*/ { "jp", FALSE, NONE, op1(Dl), 0 },
/*8b*/ { "jnp", FALSE, NONE, op1(Dl), 0 },
/*8c*/ { "jl", FALSE, NONE, op1(Dl), 0 },
/*8d*/ { "jnl", FALSE, NONE, op1(Dl), 0 },
/*8e*/ { "jle", FALSE, NONE, op1(Dl), 0 },
/*8f*/ { "jnle", FALSE, NONE, op1(Dl), 0 },
};
static const struct inst db_inst_0f9x[] = {
/*90*/ { "seto", TRUE, NONE, op1(Eb), 0 },
/*91*/ { "setno", TRUE, NONE, op1(Eb), 0 },
/*92*/ { "setb", TRUE, NONE, op1(Eb), 0 },
/*93*/ { "setnb", TRUE, NONE, op1(Eb), 0 },
/*94*/ { "setz", TRUE, NONE, op1(Eb), 0 },
/*95*/ { "setnz", TRUE, NONE, op1(Eb), 0 },
/*96*/ { "setbe", TRUE, NONE, op1(Eb), 0 },
/*97*/ { "setnbe",TRUE, NONE, op1(Eb), 0 },
/*98*/ { "sets", TRUE, NONE, op1(Eb), 0 },
/*99*/ { "setns", TRUE, NONE, op1(Eb), 0 },
/*9a*/ { "setp", TRUE, NONE, op1(Eb), 0 },
/*9b*/ { "setnp", TRUE, NONE, op1(Eb), 0 },
/*9c*/ { "setl", TRUE, NONE, op1(Eb), 0 },
/*9d*/ { "setnl", TRUE, NONE, op1(Eb), 0 },
/*9e*/ { "setle", TRUE, NONE, op1(Eb), 0 },
/*9f*/ { "setnle",TRUE, NONE, op1(Eb), 0 },
};
static const struct inst db_inst_0fax[] = {
/*a0*/ { "push", FALSE, NONE, op1(Si), 0 },
/*a1*/ { "pop", FALSE, NONE, op1(Si), 0 },
/*a2*/ { "cpuid", FALSE, NONE, 0, 0 },
/*a3*/ { "bt", TRUE, LONG, op2(R,E), 0 },
/*a4*/ { "shld", TRUE, LONG, op3(Ib,R,E), 0 },
/*a5*/ { "shld", TRUE, LONG, op3(CL,R,E), 0 },
/*a6*/ { "", FALSE, NONE, 0, 0 },
/*a7*/ { "", FALSE, NONE, 0, 0 },
/*a8*/ { "push", FALSE, NONE, op1(Si), 0 },
/*a9*/ { "pop", FALSE, NONE, op1(Si), 0 },
/*aa*/ { "rsm", FALSE, NONE, 0, 0 },
/*ab*/ { "bts", TRUE, LONG, op2(R,E), 0 },
/*ac*/ { "shrd", TRUE, LONG, op3(Ib,R,E), 0 },
/*ad*/ { "shrd", TRUE, LONG, op3(CL,R,E), 0 },
/*a6*/ { "", FALSE, NONE, 0, 0 },
/*a7*/ { "imul", TRUE, LONG, op2(E,R), 0 },
};
static const struct inst db_inst_0fbx[] = {
/*b0*/ { "cmpxchg",TRUE, BYTE, op2(R, E), 0 },
/*b0*/ { "cmpxchg",TRUE, LONG, op2(R, E), 0 },
/*b2*/ { "lss", TRUE, LONG, op2(E, R), 0 },
/*b3*/ { "btr", TRUE, LONG, op2(R, E), 0 },
/*b4*/ { "lfs", TRUE, LONG, op2(E, R), 0 },
/*b5*/ { "lgs", TRUE, LONG, op2(E, R), 0 },
/*b6*/ { "movzb", TRUE, LONG, op2(Eb, R), 0 },
/*b7*/ { "movzw", TRUE, LONG, op2(Ew, R), 0 },
/*b8*/ { "", FALSE, NONE, 0, 0 },
/*b9*/ { "", FALSE, NONE, 0, 0 },
/*ba*/ { "", TRUE, LONG, op2(Ib, E), db_Grp8 },
/*bb*/ { "btc", TRUE, LONG, op2(R, E), 0 },
/*bc*/ { "bsf", TRUE, LONG, op2(E, R), 0 },
/*bd*/ { "bsr", TRUE, LONG, op2(E, R), 0 },
/*be*/ { "movsb", TRUE, LONG, op2(Eb, R), 0 },
/*bf*/ { "movsw", TRUE, LONG, op2(Ew, R), 0 },
};
static const struct inst db_inst_0fcx[] = {
/*c0*/ { "xadd", TRUE, BYTE, op2(R, E), 0 },
/*c1*/ { "xadd", TRUE, LONG, op2(R, E), 0 },
/*c2*/ { "", FALSE, NONE, 0, 0 },
/*c3*/ { "", FALSE, NONE, 0, 0 },
/*c4*/ { "", FALSE, NONE, 0, 0 },
/*c5*/ { "", FALSE, NONE, 0, 0 },
/*c6*/ { "", FALSE, NONE, 0, 0 },
/*c7*/ { "", TRUE, NONE, op1(E), db_Grp9 },
/*c8*/ { "bswap", FALSE, LONG, op1(Ril), 0 },
/*c9*/ { "bswap", FALSE, LONG, op1(Ril), 0 },
/*ca*/ { "bswap", FALSE, LONG, op1(Ril), 0 },
/*cb*/ { "bswap", FALSE, LONG, op1(Ril), 0 },
/*cc*/ { "bswap", FALSE, LONG, op1(Ril), 0 },
/*cd*/ { "bswap", FALSE, LONG, op1(Ril), 0 },
/*ce*/ { "bswap", FALSE, LONG, op1(Ril), 0 },
/*cf*/ { "bswap", FALSE, LONG, op1(Ril), 0 },
};
static const struct inst * const db_inst_0f[] = {
db_inst_0f0x,
0,
db_inst_0f2x,
db_inst_0f3x,
0,
0,
0,
0,
db_inst_0f8x,
db_inst_0f9x,
db_inst_0fax,
db_inst_0fbx,
db_inst_0fcx,
0,
0,
0
};
static const char * const db_Esc92[] = {
"fnop", "", "", "", "", "", "", ""
};
static const char * const db_Esc94[] = {
"fchs", "fabs", "", "", "ftst", "fxam", "", ""
};
static const char * const db_Esc95[] = {
"fld1", "fldl2t","fldl2e","fldpi","fldlg2","fldln2","fldz",""
};
static const char * const db_Esc96[] = {
"f2xm1","fyl2x","fptan","fpatan","fxtract","fprem1","fdecstp",
"fincstp"
};
static const char * const db_Esc97[] = {
"fprem","fyl2xp1","fsqrt","fsincos","frndint","fscale","fsin","fcos"
};
static const char * const db_Esca5[] = {
"", "fucompp","", "", "", "", "", ""
};
static const char * const db_Escb4[] = {
"fneni","fndisi", "fnclex","fninit","fsetpm", "", "", ""
};
static const char * const db_Esce3[] = {
"", "fcompp","", "", "", "", "", ""
};
static const char * const db_Escf4[] = {
"fnstsw","", "", "", "", "", "", ""
};
static const struct finst db_Esc8[] = {
/*0*/ { "fadd", SNGL, op2(STI,ST), 0 },
/*1*/ { "fmul", SNGL, op2(STI,ST), 0 },
/*2*/ { "fcom", SNGL, op2(STI,ST), 0 },
/*3*/ { "fcomp", SNGL, op2(STI,ST), 0 },
/*4*/ { "fsub", SNGL, op2(STI,ST), 0 },
/*5*/ { "fsubr", SNGL, op2(STI,ST), 0 },
/*6*/ { "fdiv", SNGL, op2(STI,ST), 0 },
/*7*/ { "fdivr", SNGL, op2(STI,ST), 0 },
};
static const struct finst db_Esc9[] = {
/*0*/ { "fld", SNGL, op1(STI), 0 },
/*1*/ { "", NONE, op1(STI), "fxch" },
/*2*/ { "fst", SNGL, op1(X), db_Esc92 },
/*3*/ { "fstp", SNGL, 0, 0 },
/*4*/ { "fldenv", NONE, op1(X), db_Esc94 },
/*5*/ { "fldcw", NONE, op1(X), db_Esc95 },
/*6*/ { "fnstenv",NONE, op1(X), db_Esc96 },
/*7*/ { "fnstcw", NONE, op1(X), db_Esc97 },
};
static const struct finst db_Esca[] = {
/*0*/ { "fiadd", LONG, 0, 0 },
/*1*/ { "fimul", LONG, 0, 0 },
/*2*/ { "ficom", LONG, 0, 0 },
/*3*/ { "ficomp", LONG, 0, 0 },
/*4*/ { "fisub", LONG, 0, 0 },
/*5*/ { "fisubr", LONG, op1(X), db_Esca5 },
/*6*/ { "fidiv", LONG, 0, 0 },
/*7*/ { "fidivr", LONG, 0, 0 }
};
static const struct finst db_Escb[] = {
/*0*/ { "fild", LONG, 0, 0 },
/*1*/ { "", NONE, 0, 0 },
/*2*/ { "fist", LONG, 0, 0 },
/*3*/ { "fistp", LONG, 0, 0 },
/*4*/ { "", WORD, op1(X), db_Escb4 },
/*5*/ { "fld", EXTR, 0, 0 },
/*6*/ { "", WORD, 0, 0 },
/*7*/ { "fstp", EXTR, 0, 0 },
};
static const struct finst db_Escc[] = {
/*0*/ { "fadd", DBLR, op2(ST,STI), 0 },
/*1*/ { "fmul", DBLR, op2(ST,STI), 0 },
/*2*/ { "fcom", DBLR, 0, 0 },
/*3*/ { "fcomp", DBLR, 0, 0 },
/*4*/ { "fsub", DBLR, op2(ST,STI), "fsubr" },
/*5*/ { "fsubr", DBLR, op2(ST,STI), "fsub" },
/*6*/ { "fdiv", DBLR, op2(ST,STI), "fdivr" },
/*7*/ { "fdivr", DBLR, op2(ST,STI), "fdiv" },
};
static const struct finst db_Escd[] = {
/*0*/ { "fld", DBLR, op1(STI), "ffree" },
/*1*/ { "", NONE, 0, 0 },
/*2*/ { "fst", DBLR, op1(STI), 0 },
/*3*/ { "fstp", DBLR, op1(STI), 0 },
/*4*/ { "frstor", NONE, op1(STI), "fucom" },
/*5*/ { "", NONE, op1(STI), "fucomp" },
/*6*/ { "fnsave", NONE, 0, 0 },
/*7*/ { "fnstsw", NONE, 0, 0 },
};
static const struct finst db_Esce[] = {
/*0*/ { "fiadd", WORD, op2(ST,STI), "faddp" },
/*1*/ { "fimul", WORD, op2(ST,STI), "fmulp" },
/*2*/ { "ficom", WORD, 0, 0 },
/*3*/ { "ficomp", WORD, op1(X), db_Esce3 },
/*4*/ { "fisub", WORD, op2(ST,STI), "fsubrp" },
/*5*/ { "fisubr", WORD, op2(ST,STI), "fsubp" },
/*6*/ { "fidiv", WORD, op2(ST,STI), "fdivrp" },
/*7*/ { "fidivr", WORD, op2(ST,STI), "fdivp" },
};
static const struct finst db_Escf[] = {
/*0*/ { "fild", WORD, 0, 0 },
/*1*/ { "", NONE, 0, 0 },
/*2*/ { "fist", WORD, 0, 0 },
/*3*/ { "fistp", WORD, 0, 0 },
/*4*/ { "fbld", NONE, op1(XA), db_Escf4 },
/*5*/ { "fild", QUAD, 0, 0 },
/*6*/ { "fbstp", NONE, 0, 0 },
/*7*/ { "fistp", QUAD, 0, 0 },
};
static const struct finst * const db_Esc_inst[] = {
db_Esc8, db_Esc9, db_Esca, db_Escb,
db_Escc, db_Escd, db_Esce, db_Escf
};
static const char * const db_Grp1[] = {
"add",
"or",
"adc",
"sbb",
"and",
"sub",
"xor",
"cmp"
};
static const char * const db_Grp2[] = {
"rol",
"ror",
"rcl",
"rcr",
"shl",
"shr",
"shl",
"sar"
};
static const struct inst db_Grp3[] = {
{ "test", TRUE, NONE, op2(I,E), 0 },
{ "test", TRUE, NONE, op2(I,E), 0 },
{ "not", TRUE, NONE, op1(E), 0 },
{ "neg", TRUE, NONE, op1(E), 0 },
{ "mul", TRUE, NONE, op2(E,A), 0 },
{ "imul", TRUE, NONE, op2(E,A), 0 },
{ "div", TRUE, NONE, op2(E,A), 0 },
{ "idiv", TRUE, NONE, op2(E,A), 0 },
};
static const struct inst db_Grp4[] = {
{ "inc", TRUE, BYTE, op1(E), 0 },
{ "dec", TRUE, BYTE, op1(E), 0 },
{ "", TRUE, NONE, 0, 0 },
{ "", TRUE, NONE, 0, 0 },
{ "", TRUE, NONE, 0, 0 },
{ "", TRUE, NONE, 0, 0 },
{ "", TRUE, NONE, 0, 0 },
{ "", TRUE, NONE, 0, 0 }
};
static const struct inst db_Grp5[] = {
{ "inc", TRUE, LONG, op1(E), 0 },
{ "dec", TRUE, LONG, op1(E), 0 },
{ "call", TRUE, LONG, op1(Eind),0 },
{ "lcall", TRUE, LONG, op1(Eind),0 },
{ "jmp", TRUE, LONG, op1(Eind),0 },
{ "ljmp", TRUE, LONG, op1(Eind),0 },
{ "push", TRUE, LONG, op1(E), 0 },
{ "", TRUE, NONE, 0, 0 }
};
static const struct inst db_inst_table[256] = {
/*00*/ { "add", TRUE, BYTE, op2(R, E), 0 },
/*01*/ { "add", TRUE, LONG, op2(R, E), 0 },
/*02*/ { "add", TRUE, BYTE, op2(E, R), 0 },
/*03*/ { "add", TRUE, LONG, op2(E, R), 0 },
/*04*/ { "add", FALSE, BYTE, op2(I, A), 0 },
/*05*/ { "add", FALSE, LONG, op2(Is, A), 0 },
/*06*/ { "push", FALSE, NONE, op1(Si), 0 },
/*07*/ { "pop", FALSE, NONE, op1(Si), 0 },
/*08*/ { "or", TRUE, BYTE, op2(R, E), 0 },
/*09*/ { "or", TRUE, LONG, op2(R, E), 0 },
/*0a*/ { "or", TRUE, BYTE, op2(E, R), 0 },
/*0b*/ { "or", TRUE, LONG, op2(E, R), 0 },
/*0c*/ { "or", FALSE, BYTE, op2(I, A), 0 },
/*0d*/ { "or", FALSE, LONG, op2(I, A), 0 },
/*0e*/ { "push", FALSE, NONE, op1(Si), 0 },
/*0f*/ { "", FALSE, NONE, 0, 0 },
/*10*/ { "adc", TRUE, BYTE, op2(R, E), 0 },
/*11*/ { "adc", TRUE, LONG, op2(R, E), 0 },
/*12*/ { "adc", TRUE, BYTE, op2(E, R), 0 },
/*13*/ { "adc", TRUE, LONG, op2(E, R), 0 },
/*14*/ { "adc", FALSE, BYTE, op2(I, A), 0 },
/*15*/ { "adc", FALSE, LONG, op2(Is, A), 0 },
/*16*/ { "push", FALSE, NONE, op1(Si), 0 },
/*17*/ { "pop", FALSE, NONE, op1(Si), 0 },
/*18*/ { "sbb", TRUE, BYTE, op2(R, E), 0 },
/*19*/ { "sbb", TRUE, LONG, op2(R, E), 0 },
/*1a*/ { "sbb", TRUE, BYTE, op2(E, R), 0 },
/*1b*/ { "sbb", TRUE, LONG, op2(E, R), 0 },
/*1c*/ { "sbb", FALSE, BYTE, op2(I, A), 0 },
/*1d*/ { "sbb", FALSE, LONG, op2(Is, A), 0 },
/*1e*/ { "push", FALSE, NONE, op1(Si), 0 },
/*1f*/ { "pop", FALSE, NONE, op1(Si), 0 },
/*20*/ { "and", TRUE, BYTE, op2(R, E), 0 },
/*21*/ { "and", TRUE, LONG, op2(R, E), 0 },
/*22*/ { "and", TRUE, BYTE, op2(E, R), 0 },
/*23*/ { "and", TRUE, LONG, op2(E, R), 0 },
/*24*/ { "and", FALSE, BYTE, op2(I, A), 0 },
/*25*/ { "and", FALSE, LONG, op2(I, A), 0 },
/*26*/ { "", FALSE, NONE, 0, 0 },
/*27*/ { "daa", FALSE, NONE, 0, 0 },
/*28*/ { "sub", TRUE, BYTE, op2(R, E), 0 },
/*29*/ { "sub", TRUE, LONG, op2(R, E), 0 },
/*2a*/ { "sub", TRUE, BYTE, op2(E, R), 0 },
/*2b*/ { "sub", TRUE, LONG, op2(E, R), 0 },
/*2c*/ { "sub", FALSE, BYTE, op2(I, A), 0 },
/*2d*/ { "sub", FALSE, LONG, op2(Is, A), 0 },
/*2e*/ { "", FALSE, NONE, 0, 0 },
/*2f*/ { "das", FALSE, NONE, 0, 0 },
/*30*/ { "xor", TRUE, BYTE, op2(R, E), 0 },
/*31*/ { "xor", TRUE, LONG, op2(R, E), 0 },
/*32*/ { "xor", TRUE, BYTE, op2(E, R), 0 },
/*33*/ { "xor", TRUE, LONG, op2(E, R), 0 },
/*34*/ { "xor", FALSE, BYTE, op2(I, A), 0 },
/*35*/ { "xor", FALSE, LONG, op2(I, A), 0 },
/*36*/ { "", FALSE, NONE, 0, 0 },
/*37*/ { "aaa", FALSE, NONE, 0, 0 },
/*38*/ { "cmp", TRUE, BYTE, op2(R, E), 0 },
/*39*/ { "cmp", TRUE, LONG, op2(R, E), 0 },
/*3a*/ { "cmp", TRUE, BYTE, op2(E, R), 0 },
/*3b*/ { "cmp", TRUE, LONG, op2(E, R), 0 },
/*3c*/ { "cmp", FALSE, BYTE, op2(I, A), 0 },
/*3d*/ { "cmp", FALSE, LONG, op2(Is, A), 0 },
/*3e*/ { "", FALSE, NONE, 0, 0 },
/*3f*/ { "aas", FALSE, NONE, 0, 0 },
/*40*/ { "inc", FALSE, LONG, op1(Ri), 0 },
/*41*/ { "inc", FALSE, LONG, op1(Ri), 0 },
/*42*/ { "inc", FALSE, LONG, op1(Ri), 0 },
/*43*/ { "inc", FALSE, LONG, op1(Ri), 0 },
/*44*/ { "inc", FALSE, LONG, op1(Ri), 0 },
/*45*/ { "inc", FALSE, LONG, op1(Ri), 0 },
/*46*/ { "inc", FALSE, LONG, op1(Ri), 0 },
/*47*/ { "inc", FALSE, LONG, op1(Ri), 0 },
/*48*/ { "dec", FALSE, LONG, op1(Ri), 0 },
/*49*/ { "dec", FALSE, LONG, op1(Ri), 0 },
/*4a*/ { "dec", FALSE, LONG, op1(Ri), 0 },
/*4b*/ { "dec", FALSE, LONG, op1(Ri), 0 },
/*4c*/ { "dec", FALSE, LONG, op1(Ri), 0 },
/*4d*/ { "dec", FALSE, LONG, op1(Ri), 0 },
/*4e*/ { "dec", FALSE, LONG, op1(Ri), 0 },
/*4f*/ { "dec", FALSE, LONG, op1(Ri), 0 },
/*50*/ { "push", FALSE, LONG, op1(Ri), 0 },
/*51*/ { "push", FALSE, LONG, op1(Ri), 0 },
/*52*/ { "push", FALSE, LONG, op1(Ri), 0 },
/*53*/ { "push", FALSE, LONG, op1(Ri), 0 },
/*54*/ { "push", FALSE, LONG, op1(Ri), 0 },
/*55*/ { "push", FALSE, LONG, op1(Ri), 0 },
/*56*/ { "push", FALSE, LONG, op1(Ri), 0 },
/*57*/ { "push", FALSE, LONG, op1(Ri), 0 },
/*58*/ { "pop", FALSE, LONG, op1(Ri), 0 },
/*59*/ { "pop", FALSE, LONG, op1(Ri), 0 },
/*5a*/ { "pop", FALSE, LONG, op1(Ri), 0 },
/*5b*/ { "pop", FALSE, LONG, op1(Ri), 0 },
/*5c*/ { "pop", FALSE, LONG, op1(Ri), 0 },
/*5d*/ { "pop", FALSE, LONG, op1(Ri), 0 },
/*5e*/ { "pop", FALSE, LONG, op1(Ri), 0 },
/*5f*/ { "pop", FALSE, LONG, op1(Ri), 0 },
/*60*/ { "pusha", FALSE, LONG, 0, 0 },
/*61*/ { "popa", FALSE, LONG, 0, 0 },
/*62*/ { "bound", TRUE, LONG, op2(E, R), 0 },
/*63*/ { "arpl", TRUE, NONE, op2(Rw,Ew), 0 },
/*64*/ { "", FALSE, NONE, 0, 0 },
/*65*/ { "", FALSE, NONE, 0, 0 },
/*66*/ { "", FALSE, NONE, 0, 0 },
/*67*/ { "", FALSE, NONE, 0, 0 },
/*68*/ { "push", FALSE, LONG, op1(I), 0 },
/*69*/ { "imul", TRUE, LONG, op3(I,E,R), 0 },
/*6a*/ { "push", FALSE, LONG, op1(Ibs), 0 },
/*6b*/ { "imul", TRUE, LONG, op3(Ibs,E,R),0 },
/*6c*/ { "ins", FALSE, BYTE, op2(DX, DI), 0 },
/*6d*/ { "ins", FALSE, LONG, op2(DX, DI), 0 },
/*6e*/ { "outs", FALSE, BYTE, op2(SI, DX), 0 },
/*6f*/ { "outs", FALSE, LONG, op2(SI, DX), 0 },
/*70*/ { "jo", FALSE, NONE, op1(Db), 0 },
/*71*/ { "jno", FALSE, NONE, op1(Db), 0 },
/*72*/ { "jb", FALSE, NONE, op1(Db), 0 },
/*73*/ { "jnb", FALSE, NONE, op1(Db), 0 },
/*74*/ { "jz", FALSE, NONE, op1(Db), 0 },
/*75*/ { "jnz", FALSE, NONE, op1(Db), 0 },
/*76*/ { "jbe", FALSE, NONE, op1(Db), 0 },
/*77*/ { "jnbe", FALSE, NONE, op1(Db), 0 },
/*78*/ { "js", FALSE, NONE, op1(Db), 0 },
/*79*/ { "jns", FALSE, NONE, op1(Db), 0 },
/*7a*/ { "jp", FALSE, NONE, op1(Db), 0 },
/*7b*/ { "jnp", FALSE, NONE, op1(Db), 0 },
/*7c*/ { "jl", FALSE, NONE, op1(Db), 0 },
/*7d*/ { "jnl", FALSE, NONE, op1(Db), 0 },
/*7e*/ { "jle", FALSE, NONE, op1(Db), 0 },
/*7f*/ { "jnle", FALSE, NONE, op1(Db), 0 },
/*80*/ { "", TRUE, BYTE, op2(I, E), db_Grp1 },
/*81*/ { "", TRUE, LONG, op2(I, E), db_Grp1 },
/*82*/ { "", TRUE, BYTE, op2(I, E), db_Grp1 },
/*83*/ { "", TRUE, LONG, op2(Ibs,E), db_Grp1 },
/*84*/ { "test", TRUE, BYTE, op2(R, E), 0 },
/*85*/ { "test", TRUE, LONG, op2(R, E), 0 },
/*86*/ { "xchg", TRUE, BYTE, op2(R, E), 0 },
/*87*/ { "xchg", TRUE, LONG, op2(R, E), 0 },
/*88*/ { "mov", TRUE, BYTE, op2(R, E), 0 },
/*89*/ { "mov", TRUE, LONG, op2(R, E), 0 },
/*8a*/ { "mov", TRUE, BYTE, op2(E, R), 0 },
/*8b*/ { "mov", TRUE, LONG, op2(E, R), 0 },
/*8c*/ { "mov", TRUE, NONE, op2(S, Ew), 0 },
/*8d*/ { "lea", TRUE, LONG, op2(E, R), 0 },
/*8e*/ { "mov", TRUE, NONE, op2(Ew, S), 0 },
/*8f*/ { "pop", TRUE, LONG, op1(E), 0 },
/*90*/ { "nop", FALSE, NONE, 0, 0 },
/*91*/ { "xchg", FALSE, LONG, op2(A, Ri), 0 },
/*92*/ { "xchg", FALSE, LONG, op2(A, Ri), 0 },
/*93*/ { "xchg", FALSE, LONG, op2(A, Ri), 0 },
/*94*/ { "xchg", FALSE, LONG, op2(A, Ri), 0 },
/*95*/ { "xchg", FALSE, LONG, op2(A, Ri), 0 },
/*96*/ { "xchg", FALSE, LONG, op2(A, Ri), 0 },
/*97*/ { "xchg", FALSE, LONG, op2(A, Ri), 0 },
/*98*/ { "cbw", FALSE, SDEP, 0, "cwde" }, /* cbw/cwde */
/*99*/ { "cwd", FALSE, SDEP, 0, "cdq" }, /* cwd/cdq */
/*9a*/ { "lcall", FALSE, NONE, op1(OS), 0 },
/*9b*/ { "wait", FALSE, NONE, 0, 0 },
/*9c*/ { "pushf", FALSE, LONG, 0, 0 },
/*9d*/ { "popf", FALSE, LONG, 0, 0 },
/*9e*/ { "sahf", FALSE, NONE, 0, 0 },
/*9f*/ { "lahf", FALSE, NONE, 0, 0 },
/*a0*/ { "mov", FALSE, BYTE, op2(O, A), 0 },
/*a1*/ { "mov", FALSE, LONG, op2(O, A), 0 },
/*a2*/ { "mov", FALSE, BYTE, op2(A, O), 0 },
/*a3*/ { "mov", FALSE, LONG, op2(A, O), 0 },
/*a4*/ { "movs", FALSE, BYTE, op2(SI,DI), 0 },
/*a5*/ { "movs", FALSE, LONG, op2(SI,DI), 0 },
/*a6*/ { "cmps", FALSE, BYTE, op2(SI,DI), 0 },
/*a7*/ { "cmps", FALSE, LONG, op2(SI,DI), 0 },
/*a8*/ { "test", FALSE, BYTE, op2(I, A), 0 },
/*a9*/ { "test", FALSE, LONG, op2(I, A), 0 },
/*aa*/ { "stos", FALSE, BYTE, op1(DI), 0 },
/*ab*/ { "stos", FALSE, LONG, op1(DI), 0 },
/*ac*/ { "lods", FALSE, BYTE, op1(SI), 0 },
/*ad*/ { "lods", FALSE, LONG, op1(SI), 0 },
/*ae*/ { "scas", FALSE, BYTE, op1(SI), 0 },
/*af*/ { "scas", FALSE, LONG, op1(SI), 0 },
/*b0*/ { "mov", FALSE, BYTE, op2(I, Ri), 0 },
/*b1*/ { "mov", FALSE, BYTE, op2(I, Ri), 0 },
/*b2*/ { "mov", FALSE, BYTE, op2(I, Ri), 0 },
/*b3*/ { "mov", FALSE, BYTE, op2(I, Ri), 0 },
/*b4*/ { "mov", FALSE, BYTE, op2(I, Ri), 0 },
/*b5*/ { "mov", FALSE, BYTE, op2(I, Ri), 0 },
/*b6*/ { "mov", FALSE, BYTE, op2(I, Ri), 0 },
/*b7*/ { "mov", FALSE, BYTE, op2(I, Ri), 0 },
/*b8*/ { "mov", FALSE, LONG, op2(I, Ri), 0 },
/*b9*/ { "mov", FALSE, LONG, op2(I, Ri), 0 },
/*ba*/ { "mov", FALSE, LONG, op2(I, Ri), 0 },
/*bb*/ { "mov", FALSE, LONG, op2(I, Ri), 0 },
/*bc*/ { "mov", FALSE, LONG, op2(I, Ri), 0 },
/*bd*/ { "mov", FALSE, LONG, op2(I, Ri), 0 },
/*be*/ { "mov", FALSE, LONG, op2(I, Ri), 0 },
/*bf*/ { "mov", FALSE, LONG, op2(I, Ri), 0 },
/*c0*/ { "", TRUE, BYTE, op2(Ib, E), db_Grp2 },
/*c1*/ { "", TRUE, LONG, op2(Ib, E), db_Grp2 },
/*c2*/ { "ret", FALSE, NONE, op1(Iw), 0 },
/*c3*/ { "ret", FALSE, NONE, 0, 0 },
/*c4*/ { "les", TRUE, LONG, op2(E, R), 0 },
/*c5*/ { "lds", TRUE, LONG, op2(E, R), 0 },
/*c6*/ { "mov", TRUE, BYTE, op2(I, E), 0 },
/*c7*/ { "mov", TRUE, LONG, op2(I, E), 0 },
/*c8*/ { "enter", FALSE, NONE, op2(Iw, Ib), 0 },
/*c9*/ { "leave", FALSE, NONE, 0, 0 },
/*ca*/ { "lret", FALSE, NONE, op1(Iw), 0 },
/*cb*/ { "lret", FALSE, NONE, 0, 0 },
/*cc*/ { "int", FALSE, NONE, op1(o3), 0 },
/*cd*/ { "int", FALSE, NONE, op1(Ib), 0 },
/*ce*/ { "into", FALSE, NONE, 0, 0 },
/*cf*/ { "iret", FALSE, NONE, 0, 0 },
/*d0*/ { "", TRUE, BYTE, op2(o1, E), db_Grp2 },
/*d1*/ { "", TRUE, LONG, op2(o1, E), db_Grp2 },
/*d2*/ { "", TRUE, BYTE, op2(CL, E), db_Grp2 },
/*d3*/ { "", TRUE, LONG, op2(CL, E), db_Grp2 },
/*d4*/ { "aam", FALSE, NONE, op1(Iba), 0 },
/*d5*/ { "aad", FALSE, NONE, op1(Iba), 0 },
/*d6*/ { ".byte\t0xd6", FALSE, NONE, 0, 0 },
/*d7*/ { "xlat", FALSE, BYTE, op1(BX), 0 },
/*d8*/ { "", TRUE, NONE, 0, db_Esc8 },
/*d9*/ { "", TRUE, NONE, 0, db_Esc9 },
/*da*/ { "", TRUE, NONE, 0, db_Esca },
/*db*/ { "", TRUE, NONE, 0, db_Escb },
/*dc*/ { "", TRUE, NONE, 0, db_Escc },
/*dd*/ { "", TRUE, NONE, 0, db_Escd },
/*de*/ { "", TRUE, NONE, 0, db_Esce },
/*df*/ { "", TRUE, NONE, 0, db_Escf },
/*e0*/ { "loopne",FALSE, NONE, op1(Db), 0 },
/*e1*/ { "loope", FALSE, NONE, op1(Db), 0 },
/*e2*/ { "loop", FALSE, NONE, op1(Db), 0 },
/*e3*/ { "jcxz", FALSE, SDEP, op1(Db), "jecxz" },
/*e4*/ { "in", FALSE, BYTE, op2(Ib, A), 0 },
/*e5*/ { "in", FALSE, LONG, op2(Ib, A) , 0 },
/*e6*/ { "out", FALSE, BYTE, op2(A, Ib), 0 },
/*e7*/ { "out", FALSE, LONG, op2(A, Ib) , 0 },
/*e8*/ { "call", FALSE, NONE, op1(Dl), 0 },
/*e9*/ { "jmp", FALSE, NONE, op1(Dl), 0 },
/*ea*/ { "ljmp", FALSE, NONE, op1(OS), 0 },
/*eb*/ { "jmp", FALSE, NONE, op1(Db), 0 },
/*ec*/ { "in", FALSE, BYTE, op2(DX, A), 0 },
/*ed*/ { "in", FALSE, LONG, op2(DX, A) , 0 },
/*ee*/ { "out", FALSE, BYTE, op2(A, DX), 0 },
/*ef*/ { "out", FALSE, LONG, op2(A, DX) , 0 },
/*f0*/ { "", FALSE, NONE, 0, 0 },
/*f1*/ { ".byte\t0xf1", FALSE, NONE, 0, 0 },
/*f2*/ { "", FALSE, NONE, 0, 0 },
/*f3*/ { "", FALSE, NONE, 0, 0 },
/*f4*/ { "hlt", FALSE, NONE, 0, 0 },
/*f5*/ { "cmc", FALSE, NONE, 0, 0 },
/*f6*/ { "", TRUE, BYTE, 0, db_Grp3 },
/*f7*/ { "", TRUE, LONG, 0, db_Grp3 },
/*f8*/ { "clc", FALSE, NONE, 0, 0 },
/*f9*/ { "stc", FALSE, NONE, 0, 0 },
/*fa*/ { "cli", FALSE, NONE, 0, 0 },
/*fb*/ { "sti", FALSE, NONE, 0, 0 },
/*fc*/ { "cld", FALSE, NONE, 0, 0 },
/*fd*/ { "std", FALSE, NONE, 0, 0 },
/*fe*/ { "", TRUE, NONE, 0, db_Grp4 },
/*ff*/ { "", TRUE, NONE, 0, db_Grp5 },
};
static const struct inst db_bad_inst =
{ "???", FALSE, NONE, 0, 0 }
;
#define f_mod(byte) ((byte)>>6)
#define f_reg(byte) (((byte)>>3)&0x7)
#define f_rm(byte) ((byte)&0x7)
#define sib_ss(byte) ((byte)>>6)
#define sib_index(byte) (((byte)>>3)&0x7)
#define sib_base(byte) ((byte)&0x7)
struct i_addr {
int is_reg; /* if reg, reg number is in 'disp' */
int disp;
const char * base;
const char * index;
int ss;
};
static const char * const db_index_reg_16[8] = {
"%bx,%si",
"%bx,%di",
"%bp,%si",
"%bp,%di",
"%si",
"%di",
"%bp",
"%bx"
};
static const char * const db_reg[3][8] = {
{ "%al", "%cl", "%dl", "%bl", "%ah", "%ch", "%dh", "%bh" },
{ "%ax", "%cx", "%dx", "%bx", "%sp", "%bp", "%si", "%di" },
{ "%eax", "%ecx", "%edx", "%ebx", "%esp", "%ebp", "%esi", "%edi" }
};
static const char * const db_seg_reg[8] = {
"%es", "%cs", "%ss", "%ds", "%fs", "%gs", "", ""
};
/*
* lengths for size attributes
*/
static const int db_lengths[] = {
1, /* BYTE */
2, /* WORD */
4, /* LONG */
8, /* QUAD */
4, /* SNGL */
8, /* DBLR */
10, /* EXTR */
};
#define get_value_inc(result, loc, size, is_signed) \
result = db_get_value((loc), (size), (is_signed)); \
(loc) += (size);
static db_addr_t
db_disasm_esc(db_addr_t loc, int inst, int short_addr,
int size, const char *seg);
static void db_print_address(const char *seg, int size,
struct i_addr *addrp);
static db_addr_t
db_read_address(db_addr_t loc, int short_addr, int regmodrm,
struct i_addr *addrp);
/*
* Read address at location and return updated location.
*/
static db_addr_t
db_read_address(loc, short_addr, regmodrm, addrp)
db_addr_t loc;
int short_addr;
int regmodrm;
struct i_addr * addrp; /* out */
{
int mod, rm, sib, index, disp;
mod = f_mod(regmodrm);
rm = f_rm(regmodrm);
if (mod == 3) {
addrp->is_reg = TRUE;
addrp->disp = rm;
return (loc);
}
addrp->is_reg = FALSE;
addrp->index = 0;
if (short_addr) {
addrp->index = 0;
addrp->ss = 0;
switch (mod) {
case 0:
if (rm == 6) {
get_value_inc(disp, loc, 2, FALSE);
addrp->disp = disp;
addrp->base = 0;
}
else {
addrp->disp = 0;
addrp->base = db_index_reg_16[rm];
}
break;
case 1:
get_value_inc(disp, loc, 1, TRUE);
disp &= 0xFFFF;
addrp->disp = disp;
addrp->base = db_index_reg_16[rm];
break;
case 2:
get_value_inc(disp, loc, 2, FALSE);
addrp->disp = disp;
addrp->base = db_index_reg_16[rm];
break;
}
}
else {
if (mod != 3 && rm == 4) {
get_value_inc(sib, loc, 1, FALSE);
rm = sib_base(sib);
index = sib_index(sib);
if (index != 4)
addrp->index = db_reg[LONG][index];
addrp->ss = sib_ss(sib);
}
switch (mod) {
case 0:
if (rm == 5) {
get_value_inc(addrp->disp, loc, 4, FALSE);
addrp->base = 0;
}
else {
addrp->disp = 0;
addrp->base = db_reg[LONG][rm];
}
break;
case 1:
get_value_inc(disp, loc, 1, TRUE);
addrp->disp = disp;
addrp->base = db_reg[LONG][rm];
break;
case 2:
get_value_inc(disp, loc, 4, FALSE);
addrp->disp = disp;
addrp->base = db_reg[LONG][rm];
break;
}
}
return (loc);
}
static void
db_print_address(seg, size, addrp)
const char * seg;
int size;
struct i_addr * addrp;
{
if (addrp->is_reg) {
db_printf("%s", db_reg[size][addrp->disp]);
return;
}
if (seg) {
db_printf("%s:", seg);
}
db_printsym((db_addr_t)addrp->disp, DB_STGY_ANY);
if (addrp->base != 0 || addrp->index != 0) {
db_printf("(");
if (addrp->base)
db_printf("%s", addrp->base);
if (addrp->index)
db_printf(",%s,%d", addrp->index, 1<<addrp->ss);
db_printf(")");
}
}
/*
* Disassemble floating-point ("escape") instruction
* and return updated location.
*/
static db_addr_t
db_disasm_esc(loc, inst, short_addr, size, seg)
db_addr_t loc;
int inst;
int short_addr;
int size;
const char * seg;
{
int regmodrm;
const struct finst * fp;
int mod;
struct i_addr address;
const char * name;
get_value_inc(regmodrm, loc, 1, FALSE);
fp = &db_Esc_inst[inst - 0xd8][f_reg(regmodrm)];
mod = f_mod(regmodrm);
if (mod != 3) {
if (*fp->f_name == '\0') {
db_printf("<bad instruction>");
return (loc);
}
/*
* Normal address modes.
*/
loc = db_read_address(loc, short_addr, regmodrm, &address);
db_printf("%s", fp->f_name);
switch(fp->f_size) {
case SNGL:
db_printf("s");
break;
case DBLR:
db_printf("l");
break;
case EXTR:
db_printf("t");
break;
case WORD:
db_printf("s");
break;
case LONG:
db_printf("l");
break;
case QUAD:
db_printf("q");
break;
default:
break;
}
db_printf("\t");
db_print_address(seg, BYTE, &address);
}
else {
/*
* 'reg-reg' - special formats
*/
switch (fp->f_rrmode) {
case op2(ST,STI):
name = (fp->f_rrname) ? fp->f_rrname : fp->f_name;
db_printf("%s\t%%st,%%st(%d)",name,f_rm(regmodrm));
break;
case op2(STI,ST):
name = (fp->f_rrname) ? fp->f_rrname : fp->f_name;
db_printf("%s\t%%st(%d),%%st",name, f_rm(regmodrm));
break;
case op1(STI):
name = (fp->f_rrname) ? fp->f_rrname : fp->f_name;
db_printf("%s\t%%st(%d)",name, f_rm(regmodrm));
break;
case op1(X):
name = ((const char * const *)fp->f_rrname)[f_rm(regmodrm)];
if (*name == '\0')
goto bad;
db_printf("%s", name);
break;
case op1(XA):
name = ((const char * const *)fp->f_rrname)[f_rm(regmodrm)];
if (*name == '\0')
goto bad;
db_printf("%s\t%%ax", name);
break;
default:
bad:
db_printf("<bad instruction>");
break;
}
}
return (loc);
}
/*
* Disassemble instruction at 'loc'. 'altfmt' specifies an
* (optional) alternate format. Return address of start of
* next instruction.
*/
db_addr_t
db_disasm(loc, altfmt)
db_addr_t loc;
boolean_t altfmt;
{
int inst;
int size;
int short_addr;
const char * seg;
const struct inst * ip;
const char * i_name;
int i_size;
int i_mode;
int regmodrm = 0;
boolean_t first;
int displ;
int prefix;
int imm;
int imm2;
int len;
struct i_addr address;
get_value_inc(inst, loc, 1, FALSE);
short_addr = FALSE;
size = LONG;
seg = 0;
/*
* Get prefixes
*/
prefix = TRUE;
do {
switch (inst) {
case 0x66: /* data16 */
size = WORD;
break;
case 0x67:
short_addr = TRUE;
break;
case 0x26:
seg = "%es";
break;
case 0x36:
seg = "%ss";
break;
case 0x2e:
seg = "%cs";
break;
case 0x3e:
seg = "%ds";
break;
case 0x64:
seg = "%fs";
break;
case 0x65:
seg = "%gs";
break;
case 0xf0:
db_printf("lock ");
break;
case 0xf2:
db_printf("repne ");
break;
case 0xf3:
db_printf("repe "); /* XXX repe VS rep */
break;
default:
prefix = FALSE;
break;
}
if (prefix) {
get_value_inc(inst, loc, 1, FALSE);
}
} while (prefix);
if (inst >= 0xd8 && inst <= 0xdf) {
loc = db_disasm_esc(loc, inst, short_addr, size, seg);
db_printf("\n");
return (loc);
}
if (inst == 0x0f) {
get_value_inc(inst, loc, 1, FALSE);
ip = db_inst_0f[inst>>4];
if (ip == 0) {
ip = &db_bad_inst;
}
else {
ip = &ip[inst&0xf];
}
}
else
ip = &db_inst_table[inst];
if (ip->i_has_modrm) {
get_value_inc(regmodrm, loc, 1, FALSE);
loc = db_read_address(loc, short_addr, regmodrm, &address);
}
i_name = ip->i_name;
i_size = ip->i_size;
i_mode = ip->i_mode;
if (ip->i_extra == db_Grp1 || ip->i_extra == db_Grp2 ||
ip->i_extra == db_Grp6 || ip->i_extra == db_Grp7 ||
ip->i_extra == db_Grp8 || ip->i_extra == db_Grp9) {
i_name = ((const char * const *)ip->i_extra)[f_reg(regmodrm)];
}
else if (ip->i_extra == db_Grp3) {
ip = ip->i_extra;
ip = &ip[f_reg(regmodrm)];
i_name = ip->i_name;
i_mode = ip->i_mode;
}
else if (ip->i_extra == db_Grp4 || ip->i_extra == db_Grp5) {
ip = ip->i_extra;
ip = &ip[f_reg(regmodrm)];
i_name = ip->i_name;
i_mode = ip->i_mode;
i_size = ip->i_size;
}
if (i_size == SDEP) {
if (size == WORD)
db_printf("%s", i_name);
else
db_printf("%s", (const char *)ip->i_extra);
}
else {
db_printf("%s", i_name);
if (i_size != NONE) {
if (i_size == BYTE) {
db_printf("b");
size = BYTE;
}
else if (i_size == WORD) {
db_printf("w");
size = WORD;
}
else if (size == WORD)
db_printf("w");
else
db_printf("l");
}
}
db_printf("\t");
for (first = TRUE;
i_mode != 0;
i_mode >>= 8, first = FALSE)
{
if (!first)
db_printf(",");
switch (i_mode & 0xFF) {
case E:
db_print_address(seg, size, &address);
break;
case Eind:
db_printf("*");
db_print_address(seg, size, &address);
break;
case El:
db_print_address(seg, LONG, &address);
break;
case Ew:
db_print_address(seg, WORD, &address);
break;
case Eb:
db_print_address(seg, BYTE, &address);
break;
case R:
db_printf("%s", db_reg[size][f_reg(regmodrm)]);
break;
case Rw:
db_printf("%s", db_reg[WORD][f_reg(regmodrm)]);
break;
case Ri:
db_printf("%s", db_reg[size][f_rm(inst)]);
break;
case Ril:
db_printf("%s", db_reg[LONG][f_rm(inst)]);
break;
case S:
db_printf("%s", db_seg_reg[f_reg(regmodrm)]);
break;
case Si:
db_printf("%s", db_seg_reg[f_reg(inst)]);
break;
case A:
db_printf("%s", db_reg[size][0]); /* acc */
break;
case BX:
if (seg)
db_printf("%s:", seg);
db_printf("(%s)", short_addr ? "%bx" : "%ebx");
break;
case CL:
db_printf("%%cl");
break;
case DX:
db_printf("%%dx");
break;
case SI:
if (seg)
db_printf("%s:", seg);
db_printf("(%s)", short_addr ? "%si" : "%esi");
break;
case DI:
db_printf("%%es:(%s)", short_addr ? "%di" : "%edi");
break;
case CR:
db_printf("%%cr%d", f_reg(regmodrm));
break;
case DR:
db_printf("%%dr%d", f_reg(regmodrm));
break;
case TR:
db_printf("%%tr%d", f_reg(regmodrm));
break;
case I:
len = db_lengths[size];
get_value_inc(imm, loc, len, FALSE);
db_printf("$%#r", imm);
break;
case Is:
len = db_lengths[size];
get_value_inc(imm, loc, len, FALSE);
db_printf("$%+#r", imm);
break;
case Ib:
get_value_inc(imm, loc, 1, FALSE);
db_printf("$%#r", imm);
break;
case Iba:
get_value_inc(imm, loc, 1, FALSE);
if (imm != 0x0a)
db_printf("$%#r", imm);
break;
case Ibs:
get_value_inc(imm, loc, 1, TRUE);
if (size == WORD)
imm &= 0xFFFF;
db_printf("$%+#r", imm);
break;
case Iw:
get_value_inc(imm, loc, 2, FALSE);
db_printf("$%#r", imm);
break;
case O:
len = (short_addr ? 2 : 4);
get_value_inc(displ, loc, len, FALSE);
if (seg)
db_printf("%s:%+#r",seg, displ);
else
db_printsym((db_addr_t)displ, DB_STGY_ANY);
break;
case Db:
get_value_inc(displ, loc, 1, TRUE);
displ += loc;
if (size == WORD)
displ &= 0xFFFF;
db_printsym((db_addr_t)displ, DB_STGY_XTRN);
break;
case Dl:
len = db_lengths[size];
get_value_inc(displ, loc, len, FALSE);
displ += loc;
if (size == WORD)
displ &= 0xFFFF;
db_printsym((db_addr_t)displ, DB_STGY_XTRN);
break;
case o1:
db_printf("$1");
break;
case o3:
db_printf("$3");
break;
case OS:
len = db_lengths[size];
get_value_inc(imm, loc, len, FALSE); /* offset */
get_value_inc(imm2, loc, 2, FALSE); /* segment */
db_printf("$%#r,%#r", imm2, imm);
break;
}
}
db_printf("\n");
return (loc);
}