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/*
* i386 on i386 translation
*
* Copyright (c) 2003 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <assert.h>
#include "cpu.h"
#include "exec-all.h"
#include "disas.h"
#ifdef USE_CODE_COPY
#include <signal.h>
#include <sys/mman.h>
#include <sys/ucontext.h>
extern char exec_loop;
/* operand size */
enum {
OT_BYTE = 0,
OT_WORD,
OT_LONG,
OT_QUAD,
};
#define PREFIX_REPZ 0x01
#define PREFIX_REPNZ 0x02
#define PREFIX_LOCK 0x04
#define PREFIX_DATA 0x08
#define PREFIX_ADR 0x10
typedef struct DisasContext {
/* current insn context */
int override; /* -1 if no override */
int prefix;
int aflag, dflag;
uint8_t *pc; /* pc = eip + cs_base */
int is_jmp; /* 1 = means jump (stop translation), 2 means CPU
static state change (stop translation) */
/* code output */
uint8_t *gen_code_ptr;
uint8_t *gen_code_start;
/* current block context */
uint8_t *cs_base; /* base of CS segment */
int pe; /* protected mode */
int code32; /* 32 bit code segment */
int f_st; /* currently unused */
int vm86; /* vm86 mode */
int cpl;
int iopl;
int flags;
struct TranslationBlock *tb;
} DisasContext;
#define CPU_FIELD_OFFSET(field) offsetof(CPUState, field)
#define CPU_SEG 0x64 /* fs override */
static inline void gb(DisasContext *s, uint32_t val)
{
*s->gen_code_ptr++ = val;
}
static inline void gw(DisasContext *s, uint32_t val)
{
*s->gen_code_ptr++ = val;
*s->gen_code_ptr++ = val >> 8;
}
static inline void gl(DisasContext *s, uint32_t val)
{
*s->gen_code_ptr++ = val;
*s->gen_code_ptr++ = val >> 8;
*s->gen_code_ptr++ = val >> 16;
*s->gen_code_ptr++ = val >> 24;
}
static inline void gjmp(DisasContext *s, long val)
{
gb(s, 0xe9); /* jmp */
gl(s, val - (long)(s->gen_code_ptr + 4));
}
static inline void gen_movl_addr_im(DisasContext *s,
uint32_t addr, uint32_t val)
{
gb(s, CPU_SEG); /* seg movl im, addr */
gb(s, 0xc7);
gb(s, 0x05);
gl(s, addr);
gl(s, val);
}
static inline void gen_movw_addr_im(DisasContext *s,
uint32_t addr, uint32_t val)
{
gb(s, CPU_SEG); /* seg movl im, addr */
gb(s, 0x66);
gb(s, 0xc7);
gb(s, 0x05);
gl(s, addr);
gw(s, val);
}
static void gen_jmp(DisasContext *s, uint32_t target_eip)
{
TranslationBlock *tb = s->tb;
gb(s, 0xe9); /* jmp */
tb->tb_jmp_offset[0] = s->gen_code_ptr - s->gen_code_start;
gl(s, 0);
tb->tb_next_offset[0] = s->gen_code_ptr - s->gen_code_start;
gen_movl_addr_im(s, CPU_FIELD_OFFSET(eip), target_eip);
gen_movl_addr_im(s, CPU_FIELD_OFFSET(tmp0), (uint32_t)tb);
gjmp(s, (long)&exec_loop);
s->is_jmp = 1;
}
static void gen_jcc(DisasContext *s, int op,
uint32_t target_eip, uint32_t next_eip)
{
TranslationBlock *tb = s->tb;
gb(s, 0x0f); /* jcc */
gb(s, 0x80 + op);
tb->tb_jmp_offset[0] = s->gen_code_ptr - s->gen_code_start;
gl(s, 0);
gb(s, 0xe9); /* jmp */
tb->tb_jmp_offset[1] = s->gen_code_ptr - s->gen_code_start;
gl(s, 0);
tb->tb_next_offset[0] = s->gen_code_ptr - s->gen_code_start;
gen_movl_addr_im(s, CPU_FIELD_OFFSET(eip), target_eip);
gen_movl_addr_im(s, CPU_FIELD_OFFSET(tmp0), (uint32_t)tb);
gjmp(s, (long)&exec_loop);
tb->tb_next_offset[1] = s->gen_code_ptr - s->gen_code_start;
gen_movl_addr_im(s, CPU_FIELD_OFFSET(eip), next_eip);
gen_movl_addr_im(s, CPU_FIELD_OFFSET(tmp0), (uint32_t)tb | 1);
gjmp(s, (long)&exec_loop);
s->is_jmp = 1;
}
static void gen_eob(DisasContext *s)
{
gen_movl_addr_im(s, CPU_FIELD_OFFSET(tmp0), 0);
gjmp(s, (long)&exec_loop);
s->is_jmp = 1;
}
static inline void gen_lea_modrm(DisasContext *s, int modrm)
{
int havesib;
int base, disp;
int index;
int scale;
int mod, rm, code;
mod = (modrm >> 6) & 3;
rm = modrm & 7;
if (s->aflag) {
havesib = 0;
base = rm;
index = 0;
scale = 0;
if (base == 4) {
havesib = 1;
code = ldub_code(s->pc++);
scale = (code >> 6) & 3;
index = (code >> 3) & 7;
base = code & 7;
}
switch (mod) {
case 0:
if (base == 5) {
base = -1;
disp = ldl_code(s->pc);
s->pc += 4;
} else {
disp = 0;
}
break;
case 1:
disp = (int8_t)ldub_code(s->pc++);
break;
default:
case 2:
disp = ldl_code(s->pc);
s->pc += 4;
break;
}
} else {
switch (mod) {
case 0:
if (rm == 6) {
disp = lduw_code(s->pc);
s->pc += 2;
} else {
disp = 0;
}
break;
case 1:
disp = (int8_t)ldub_code(s->pc++);
break;
default:
case 2:
disp = lduw_code(s->pc);
s->pc += 2;
break;
}
}
}
static inline void parse_modrm(DisasContext *s, int modrm)
{
if ((modrm & 0xc0) != 0xc0)
gen_lea_modrm(s, modrm);
}
static inline uint32_t insn_get(DisasContext *s, int ot)
{
uint32_t ret;
switch(ot) {
case OT_BYTE:
ret = ldub_code(s->pc);
s->pc++;
break;
case OT_WORD:
ret = lduw_code(s->pc);
s->pc += 2;
break;
default:
case OT_LONG:
ret = ldl_code(s->pc);
s->pc += 4;
break;
}
return ret;
}
/* convert one instruction. s->is_jmp is set if the translation must
be stopped. */
static int disas_insn(DisasContext *s)
{
uint8_t *pc_start, *pc_tmp, *pc_start_insn;
int b, prefixes, aflag, dflag, next_eip, val;
int ot;
int modrm, mod, op, rm;
pc_start = s->pc;
prefixes = 0;
aflag = s->code32;
dflag = s->code32;
s->override = -1;
next_byte:
b = ldub_code(s->pc);
s->pc++;
/* check prefixes */
switch (b) {
case 0xf3:
prefixes |= PREFIX_REPZ;
goto next_byte;
case 0xf2:
prefixes |= PREFIX_REPNZ;
goto next_byte;
case 0xf0:
prefixes |= PREFIX_LOCK;
goto next_byte;
case 0x2e:
s->override = R_CS;
goto next_byte;
case 0x36:
s->override = R_SS;
goto next_byte;
case 0x3e:
s->override = R_DS;
goto next_byte;
case 0x26:
s->override = R_ES;
goto next_byte;
case 0x64:
s->override = R_FS;
goto next_byte;
case 0x65:
s->override = R_GS;
goto next_byte;
case 0x66:
prefixes |= PREFIX_DATA;
goto next_byte;
case 0x67:
prefixes |= PREFIX_ADR;
goto next_byte;
}
if (prefixes & PREFIX_DATA)
dflag ^= 1;
if (prefixes & PREFIX_ADR)
aflag ^= 1;
s->prefix = prefixes;
s->aflag = aflag;
s->dflag = dflag;
/* lock generation */
if (prefixes & PREFIX_LOCK)
goto unsupported_op;
if (s->override == R_FS || s->override == R_GS || s->override == R_CS)
goto unsupported_op;
pc_start_insn = s->pc - 1;
/* now check op code */
reswitch:
switch(b) {
case 0x0f:
/**************************/
/* extended op code */
b = ldub_code(s->pc++) | 0x100;
goto reswitch;
/**************************/
/* arith & logic */
case 0x00 ... 0x05:
case 0x08 ... 0x0d:
case 0x10 ... 0x15:
case 0x18 ... 0x1d:
case 0x20 ... 0x25:
case 0x28 ... 0x2d:
case 0x30 ... 0x35:
case 0x38 ... 0x3d:
{
int f;
f = (b >> 1) & 3;
if ((b & 1) == 0)
ot = OT_BYTE;
else
ot = dflag ? OT_LONG : OT_WORD;
switch(f) {
case 0: /* OP Ev, Gv */
modrm = ldub_code(s->pc++);
parse_modrm(s, modrm);
break;
case 1: /* OP Gv, Ev */
modrm = ldub_code(s->pc++);
parse_modrm(s, modrm);
break;
case 2: /* OP A, Iv */
insn_get(s, ot);
break;
}
}
break;
case 0x80: /* GRP1 */
case 0x81:
case 0x82:
case 0x83:
{
if ((b & 1) == 0)
ot = OT_BYTE;
else
ot = dflag ? OT_LONG : OT_WORD;
modrm = ldub_code(s->pc++);
parse_modrm(s, modrm);
switch(b) {
default:
case 0x80:
case 0x81:
case 0x82:
insn_get(s, ot);
break;
case 0x83:
insn_get(s, OT_BYTE);
break;
}
}
break;
/**************************/
/* inc, dec, and other misc arith */
case 0x40 ... 0x47: /* inc Gv */
break;
case 0x48 ... 0x4f: /* dec Gv */
break;
case 0xf6: /* GRP3 */
case 0xf7:
if ((b & 1) == 0)
ot = OT_BYTE;
else
ot = dflag ? OT_LONG : OT_WORD;
modrm = ldub_code(s->pc++);
op = (modrm >> 3) & 7;
parse_modrm(s, modrm);
switch(op) {
case 0: /* test */
insn_get(s, ot);
break;
case 2: /* not */
break;
case 3: /* neg */
break;
case 4: /* mul */
break;
case 5: /* imul */
break;
case 6: /* div */
break;
case 7: /* idiv */
break;
default:
goto illegal_op;
}
break;
case 0xfe: /* GRP4 */
case 0xff: /* GRP5 */
if ((b & 1) == 0)
ot = OT_BYTE;
else
ot = dflag ? OT_LONG : OT_WORD;
modrm = ldub_code(s->pc++);
mod = (modrm >> 6) & 3;
op = (modrm >> 3) & 7;
if (op >= 2 && b == 0xfe) {
goto illegal_op;
}
pc_tmp = s->pc;
parse_modrm(s, modrm);
switch(op) {
case 0: /* inc Ev */
break;
case 1: /* dec Ev */
break;
case 2: /* call Ev */
/* XXX: optimize and handle MEM exceptions specifically
fs movl %eax, regs[0]
movl Ev, %eax
pushl next_eip
fs movl %eax, eip
*/
goto unsupported_op;
case 3: /* lcall Ev */
goto unsupported_op;
case 4: /* jmp Ev */
/* XXX: optimize and handle MEM exceptions specifically
fs movl %eax, regs[0]
movl Ev, %eax
fs movl %eax, eip
*/
goto unsupported_op;
case 5: /* ljmp Ev */
goto unsupported_op;
case 6: /* push Ev */
break;
default:
goto illegal_op;
}
break;
case 0xa8: /* test eAX, Iv */
case 0xa9:
if ((b & 1) == 0)
ot = OT_BYTE;
else
ot = dflag ? OT_LONG : OT_WORD;
insn_get(s, ot);
break;
case 0x98: /* CWDE/CBW */
break;
case 0x99: /* CDQ/CWD */
break;
case 0x1af: /* imul Gv, Ev */
case 0x69: /* imul Gv, Ev, I */
case 0x6b:
ot = dflag ? OT_LONG : OT_WORD;
modrm = ldub_code(s->pc++);
parse_modrm(s, modrm);
if (b == 0x69) {
insn_get(s, ot);
} else if (b == 0x6b) {
insn_get(s, OT_BYTE);
} else {
}
break;
case 0x84: /* test Ev, Gv */
case 0x85:
case 0x1c0:
case 0x1c1: /* xadd Ev, Gv */
case 0x1b0:
case 0x1b1: /* cmpxchg Ev, Gv */
case 0x8f: /* pop Ev */
case 0x88:
case 0x89: /* mov Gv, Ev */
case 0x8a:
case 0x8b: /* mov Ev, Gv */
case 0x1b6: /* movzbS Gv, Eb */
case 0x1b7: /* movzwS Gv, Eb */
case 0x1be: /* movsbS Gv, Eb */
case 0x1bf: /* movswS Gv, Eb */
case 0x86:
case 0x87: /* xchg Ev, Gv */
case 0xd0:
case 0xd1: /* shift Ev,1 */
case 0xd2:
case 0xd3: /* shift Ev,cl */
case 0x1a5: /* shld cl */
case 0x1ad: /* shrd cl */
case 0x190 ... 0x19f: /* setcc Gv */
/* XXX: emulate cmov if not available ? */
case 0x140 ... 0x14f: /* cmov Gv, Ev */
case 0x1a3: /* bt Gv, Ev */
case 0x1ab: /* bts */
case 0x1b3: /* btr */
case 0x1bb: /* btc */
case 0x1bc: /* bsf */
case 0x1bd: /* bsr */
modrm = ldub_code(s->pc++);
parse_modrm(s, modrm);
break;
case 0x1c7: /* cmpxchg8b */
modrm = ldub_code(s->pc++);
mod = (modrm >> 6) & 3;
if (mod == 3)
goto illegal_op;
parse_modrm(s, modrm);
break;
/**************************/
/* push/pop */
case 0x50 ... 0x57: /* push */
case 0x58 ... 0x5f: /* pop */
case 0x60: /* pusha */
case 0x61: /* popa */
break;
case 0x68: /* push Iv */
case 0x6a:
ot = dflag ? OT_LONG : OT_WORD;
if (b == 0x68)
insn_get(s, ot);
else
insn_get(s, OT_BYTE);
break;
case 0xc8: /* enter */
lduw_code(s->pc);
s->pc += 2;
ldub_code(s->pc++);
break;
case 0xc9: /* leave */
break;
case 0x06: /* push es */
case 0x0e: /* push cs */
case 0x16: /* push ss */
case 0x1e: /* push ds */
/* XXX: optimize:
push segs[n].selector
*/
goto unsupported_op;
case 0x1a0: /* push fs */
case 0x1a8: /* push gs */
goto unsupported_op;
case 0x07: /* pop es */
case 0x17: /* pop ss */
case 0x1f: /* pop ds */
goto unsupported_op;
case 0x1a1: /* pop fs */
case 0x1a9: /* pop gs */
goto unsupported_op;
case 0x8e: /* mov seg, Gv */
/* XXX: optimize:
fs movl r, regs[]
movl segs[].selector, r
mov r, Gv
fs movl regs[], r
*/
goto unsupported_op;
case 0x8c: /* mov Gv, seg */
goto unsupported_op;
case 0xc4: /* les Gv */
op = R_ES;
goto do_lxx;
case 0xc5: /* lds Gv */
op = R_DS;
goto do_lxx;
case 0x1b2: /* lss Gv */
op = R_SS;
goto do_lxx;
case 0x1b4: /* lfs Gv */
op = R_FS;
goto do_lxx;
case 0x1b5: /* lgs Gv */
op = R_GS;
do_lxx:
goto unsupported_op;
/************************/
/* floats */
case 0xd8 ... 0xdf:
#if 1
/* currently not stable enough */
goto unsupported_op;
#else
if (s->flags & (HF_EM_MASK | HF_TS_MASK))
goto unsupported_op;
#endif
#if 0
/* for testing FPU context switch */
{
static int count;
count = (count + 1) % 3;
if (count != 0)
goto unsupported_op;
}
#endif
modrm = ldub_code(s->pc++);
mod = (modrm >> 6) & 3;
rm = modrm & 7;
op = ((b & 7) << 3) | ((modrm >> 3) & 7);
if (mod != 3) {
/* memory op */
parse_modrm(s, modrm);
switch(op) {
case 0x00 ... 0x07: /* fxxxs */
case 0x10 ... 0x17: /* fixxxl */
case 0x20 ... 0x27: /* fxxxl */
case 0x30 ... 0x37: /* fixxx */
break;
case 0x08: /* flds */
case 0x0a: /* fsts */
case 0x0b: /* fstps */
case 0x18: /* fildl */
case 0x1a: /* fistl */
case 0x1b: /* fistpl */
case 0x28: /* fldl */
case 0x2a: /* fstl */
case 0x2b: /* fstpl */
case 0x38: /* filds */
case 0x3a: /* fists */
case 0x3b: /* fistps */
case 0x0c: /* fldenv mem */
case 0x0d: /* fldcw mem */
case 0x0e: /* fnstenv mem */
case 0x0f: /* fnstcw mem */
case 0x1d: /* fldt mem */
case 0x1f: /* fstpt mem */
case 0x2c: /* frstor mem */
case 0x2e: /* fnsave mem */
case 0x2f: /* fnstsw mem */
case 0x3c: /* fbld */
case 0x3e: /* fbstp */
case 0x3d: /* fildll */
case 0x3f: /* fistpll */
break;
default:
goto illegal_op;
}
} else {
/* register float ops */
switch(op) {
case 0x08: /* fld sti */
case 0x09: /* fxchg sti */
break;
case 0x0a: /* grp d9/2 */
switch(rm) {
case 0: /* fnop */
break;
default:
goto illegal_op;
}
break;
case 0x0c: /* grp d9/4 */
switch(rm) {
case 0: /* fchs */
case 1: /* fabs */
case 4: /* ftst */
case 5: /* fxam */
break;
default:
goto illegal_op;
}
break;
case 0x0d: /* grp d9/5 */
switch(rm) {
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
break;
default:
goto illegal_op;
}
break;
case 0x0e: /* grp d9/6 */
break;
case 0x0f: /* grp d9/7 */
break;
case 0x00: case 0x01: case 0x04 ... 0x07: /* fxxx st, sti */
case 0x20: case 0x21: case 0x24 ... 0x27: /* fxxx sti, st */
case 0x30: case 0x31: case 0x34 ... 0x37: /* fxxxp sti, st */
break;
case 0x02: /* fcom */
break;
case 0x03: /* fcomp */
break;
case 0x15: /* da/5 */
switch(rm) {
case 1: /* fucompp */
break;
default:
goto illegal_op;
}
break;
case 0x1c:
switch(rm) {
case 0: /* feni (287 only, just do nop here) */
case 1: /* fdisi (287 only, just do nop here) */
goto unsupported_op;
case 2: /* fclex */
case 3: /* fninit */
case 4: /* fsetpm (287 only, just do nop here) */
break;
default:
goto illegal_op;
}
break;
case 0x1d: /* fucomi */
break;
case 0x1e: /* fcomi */
break;
case 0x2a: /* fst sti */
break;
case 0x2b: /* fstp sti */
break;
case 0x2c: /* fucom st(i) */
break;
case 0x2d: /* fucomp st(i) */
break;
case 0x33: /* de/3 */
switch(rm) {
case 1: /* fcompp */
break;
default:
goto illegal_op;
}
break;
case 0x3c: /* df/4 */
switch(rm) {
case 0:
break;
default:
goto illegal_op;
}
break;
case 0x3d: /* fucomip */
break;
case 0x3e: /* fcomip */
break;
case 0x10 ... 0x13: /* fcmovxx */
case 0x18 ... 0x1b:
break;
default:
goto illegal_op;
}
}
s->tb->cflags |= CF_TB_FP_USED;
break;
/**************************/
/* mov */
case 0xc6:
case 0xc7: /* mov Ev, Iv */
if ((b & 1) == 0)
ot = OT_BYTE;
else
ot = dflag ? OT_LONG : OT_WORD;
modrm = ldub_code(s->pc++);
parse_modrm(s, modrm);
insn_get(s, ot);
break;
case 0x8d: /* lea */
ot = dflag ? OT_LONG : OT_WORD;
modrm = ldub_code(s->pc++);
mod = (modrm >> 6) & 3;
if (mod == 3)
goto illegal_op;
parse_modrm(s, modrm);
break;
case 0xa0: /* mov EAX, Ov */
case 0xa1:
case 0xa2: /* mov Ov, EAX */
case 0xa3:
if ((b & 1) == 0)
ot = OT_BYTE;
else
ot = dflag ? OT_LONG : OT_WORD;
if (s->aflag)
insn_get(s, OT_LONG);
else
insn_get(s, OT_WORD);
break;
case 0xd7: /* xlat */
break;
case 0xb0 ... 0xb7: /* mov R, Ib */
insn_get(s, OT_BYTE);
break;
case 0xb8 ... 0xbf: /* mov R, Iv */
ot = dflag ? OT_LONG : OT_WORD;
insn_get(s, ot);
break;
case 0x91 ... 0x97: /* xchg R, EAX */
break;
/************************/
/* shifts */
case 0xc0:
case 0xc1: /* shift Ev,imm */
case 0x1a4: /* shld imm */
case 0x1ac: /* shrd imm */
modrm = ldub_code(s->pc++);
parse_modrm(s, modrm);
ldub_code(s->pc++);
break;
/************************/
/* string ops */
case 0xa4: /* movsS */
case 0xa5:
break;
case 0xaa: /* stosS */
case 0xab:
break;
case 0xac: /* lodsS */
case 0xad:
break;
case 0xae: /* scasS */
case 0xaf:
break;
case 0xa6: /* cmpsS */
case 0xa7:
break;
case 0x6c: /* insS */
case 0x6d:
goto unsupported_op;
case 0x6e: /* outsS */
case 0x6f:
goto unsupported_op;
/************************/
/* port I/O */
case 0xe4:
case 0xe5:
goto unsupported_op;
case 0xe6:
case 0xe7:
goto unsupported_op;
case 0xec:
case 0xed:
goto unsupported_op;
case 0xee:
case 0xef:
goto unsupported_op;
/************************/
/* control */
#if 0
case 0xc2: /* ret im */
val = ldsw_code(s->pc);
s->pc += 2;
gen_pop_T0(s);
gen_stack_update(s, val + (2 << s->dflag));
if (s->dflag == 0)
gen_op_andl_T0_ffff();
gen_op_jmp_T0();
gen_eob(s);
break;
#endif
case 0xc3: /* ret */
gb(s, CPU_SEG);
if (!s->dflag)
gb(s, 0x66); /* d16 */
gb(s, 0x8f); /* pop addr */
gb(s, 0x05);
gl(s, CPU_FIELD_OFFSET(eip));
if (!s->dflag) {
/* reset high bits of EIP */
gen_movw_addr_im(s, CPU_FIELD_OFFSET(eip) + 2, 0);
}
gen_eob(s);
goto no_copy;
case 0xca: /* lret im */
case 0xcb: /* lret */
case 0xcf: /* iret */
case 0x9a: /* lcall im */
case 0xea: /* ljmp im */
goto unsupported_op;
case 0xe8: /* call im */
ot = dflag ? OT_LONG : OT_WORD;
val = insn_get(s, ot);
next_eip = s->pc - s->cs_base;
val += next_eip;
if (s->dflag) {
gb(s, 0x68); /* pushl imm */
gl(s, next_eip);
} else {
gb(s, 0x66); /* pushw imm */
gb(s, 0x68);
gw(s, next_eip);
val &= 0xffff;
}
gen_jmp(s, val);
goto no_copy;
case 0xe9: /* jmp */
ot = dflag ? OT_LONG : OT_WORD;
val = insn_get(s, ot);
val += s->pc - s->cs_base;
if (s->dflag == 0)
val = val & 0xffff;
gen_jmp(s, val);
goto no_copy;
case 0xeb: /* jmp Jb */
val = (int8_t)insn_get(s, OT_BYTE);
val += s->pc - s->cs_base;
if (s->dflag == 0)
val = val & 0xffff;
gen_jmp(s, val);
goto no_copy;
case 0x70 ... 0x7f: /* jcc Jb */
val = (int8_t)insn_get(s, OT_BYTE);
goto do_jcc;
case 0x180 ... 0x18f: /* jcc Jv */
if (dflag) {
val = insn_get(s, OT_LONG);
} else {
val = (int16_t)insn_get(s, OT_WORD);
}
do_jcc:
next_eip = s->pc - s->cs_base;
val += next_eip;
if (s->dflag == 0)
val &= 0xffff;
gen_jcc(s, b & 0xf, val, next_eip);
goto no_copy;
/************************/
/* flags */
case 0x9c: /* pushf */
/* XXX: put specific code ? */
goto unsupported_op;
case 0x9d: /* popf */
goto unsupported_op;
case 0x9e: /* sahf */
case 0x9f: /* lahf */
case 0xf5: /* cmc */
case 0xf8: /* clc */
case 0xf9: /* stc */
case 0xfc: /* cld */
case 0xfd: /* std */
break;
/************************/
/* bit operations */
case 0x1ba: /* bt/bts/btr/btc Gv, im */
ot = dflag ? OT_LONG : OT_WORD;
modrm = ldub_code(s->pc++);
op = (modrm >> 3) & 7;
parse_modrm(s, modrm);
/* load shift */
ldub_code(s->pc++);
if (op < 4)
goto illegal_op;
break;
/************************/
/* bcd */
case 0x27: /* daa */
break;
case 0x2f: /* das */
break;
case 0x37: /* aaa */
break;
case 0x3f: /* aas */
break;
case 0xd4: /* aam */
ldub_code(s->pc++);
break;
case 0xd5: /* aad */
ldub_code(s->pc++);
break;
/************************/
/* misc */
case 0x90: /* nop */
break;
case 0x9b: /* fwait */
if ((s->flags & (HF_MP_MASK | HF_TS_MASK)) ==
(HF_MP_MASK | HF_TS_MASK)) {
goto unsupported_op;
}
break;
case 0xcc: /* int3 */
goto unsupported_op;
case 0xcd: /* int N */
goto unsupported_op;
case 0xce: /* into */
goto unsupported_op;
case 0xf1: /* icebp (undocumented, exits to external debugger) */
goto unsupported_op;
case 0xfa: /* cli */
goto unsupported_op;
case 0xfb: /* sti */
goto unsupported_op;
case 0x62: /* bound */
modrm = ldub_code(s->pc++);
mod = (modrm >> 6) & 3;
if (mod == 3)
goto illegal_op;
parse_modrm(s, modrm);
break;
case 0x1c8 ... 0x1cf: /* bswap reg */
break;
case 0xd6: /* salc */
break;
case 0xe0: /* loopnz */
case 0xe1: /* loopz */
case 0xe2: /* loop */
case 0xe3: /* jecxz */
goto unsupported_op;
case 0x130: /* wrmsr */
case 0x132: /* rdmsr */
goto unsupported_op;
case 0x131: /* rdtsc */
goto unsupported_op;
case 0x1a2: /* cpuid */
goto unsupported_op;
case 0xf4: /* hlt */
goto unsupported_op;
case 0x100:
goto unsupported_op;
case 0x101:
goto unsupported_op;
case 0x108: /* invd */
case 0x109: /* wbinvd */
goto unsupported_op;
case 0x63: /* arpl */
goto unsupported_op;
case 0x102: /* lar */
case 0x103: /* lsl */
goto unsupported_op;
case 0x118:
goto unsupported_op;
case 0x120: /* mov reg, crN */
case 0x122: /* mov crN, reg */
goto unsupported_op;
case 0x121: /* mov reg, drN */
case 0x123: /* mov drN, reg */
goto unsupported_op;
case 0x106: /* clts */
goto unsupported_op;
default:
goto illegal_op;
}
/* just copy the code */
/* no override yet */
if (!s->dflag)
gb(s, 0x66);
if (!s->aflag)
gb(s, 0x67);
if (prefixes & PREFIX_REPZ)
gb(s, 0xf3);
else if (prefixes & PREFIX_REPNZ)
gb(s, 0xf2);
{
int len, i;
len = s->pc - pc_start_insn;
for(i = 0; i < len; i++) {
*s->gen_code_ptr++ = ldub_code(pc_start_insn + i);
}
}
no_copy:
return 0;
illegal_op:
unsupported_op:
/* fall back to slower code gen necessary */
s->pc = pc_start;
return -1;
}
#define GEN_CODE_MAX_SIZE 8192
#define GEN_CODE_MAX_INSN_SIZE 512
static inline int gen_intermediate_code_internal(CPUState *env,
TranslationBlock *tb,
uint8_t *gen_code_ptr,
int *gen_code_size_ptr,
int search_pc,
uint8_t *tc_ptr)
{
DisasContext dc1, *dc = &dc1;
uint8_t *pc_insn, *pc_start, *gen_code_end;
int flags, ret;
uint8_t *cs_base;
if (env->nb_breakpoints > 0 ||
env->singlestep_enabled)
return -1;
flags = tb->flags;
if (flags & (HF_TF_MASK | HF_ADDSEG_MASK |
HF_SOFTMMU_MASK | HF_INHIBIT_IRQ_MASK))
return -1;
if (!(flags & HF_SS32_MASK))
return -1;
if (tb->cflags & CF_SINGLE_INSN)
return -1;
gen_code_end = gen_code_ptr +
GEN_CODE_MAX_SIZE - GEN_CODE_MAX_INSN_SIZE;
dc->gen_code_ptr = gen_code_ptr;
dc->gen_code_start = gen_code_ptr;
/* generate intermediate code */
pc_start = (uint8_t *)tb->pc;
cs_base = (uint8_t *)tb->cs_base;
dc->pc = pc_start;
dc->cs_base = cs_base;
dc->pe = (flags >> HF_PE_SHIFT) & 1;
dc->code32 = (flags >> HF_CS32_SHIFT) & 1;
dc->f_st = 0;
dc->vm86 = (flags >> VM_SHIFT) & 1;
dc->cpl = (flags >> HF_CPL_SHIFT) & 3;
dc->iopl = (flags >> IOPL_SHIFT) & 3;
dc->tb = tb;
dc->flags = flags;
dc->is_jmp = 0;
for(;;) {
pc_insn = dc->pc;
ret = disas_insn(dc);
if (ret < 0) {
/* unsupported insn */
if (dc->pc == pc_start) {
/* if first instruction, signal that no copying was done */
return -1;
} else {
gen_jmp(dc, dc->pc - dc->cs_base);
dc->is_jmp = 1;
}
}
if (search_pc) {
/* search pc mode */
if (tc_ptr < dc->gen_code_ptr) {
env->eip = pc_insn - cs_base;
return 0;
}
}
/* stop translation if indicated */
if (dc->is_jmp)
break;
/* if too long translation, stop generation */
if (dc->gen_code_ptr >= gen_code_end ||
(dc->pc - pc_start) >= (TARGET_PAGE_SIZE - 32)) {
gen_jmp(dc, dc->pc - dc->cs_base);
break;
}
}
#ifdef DEBUG_DISAS
if (loglevel & CPU_LOG_TB_IN_ASM) {
fprintf(logfile, "----------------\n");
fprintf(logfile, "IN: COPY: %s fpu=%d\n",
lookup_symbol(pc_start),
tb->cflags & CF_TB_FP_USED ? 1 : 0);
disas(logfile, pc_start, dc->pc - pc_start, 0, !dc->code32);
fprintf(logfile, "\n");
}
#endif
if (!search_pc) {
*gen_code_size_ptr = dc->gen_code_ptr - dc->gen_code_start;
tb->size = dc->pc - pc_start;
tb->cflags |= CF_CODE_COPY;
return 0;
} else {
return -1;
}
}
/* generate code by just copying data. Return -1 if cannot generate
any code. Return 0 if code was generated */
int cpu_gen_code_copy(CPUState *env, TranslationBlock *tb,
int max_code_size, int *gen_code_size_ptr)
{
/* generate machine code */
tb->tb_next_offset[0] = 0xffff;
tb->tb_next_offset[1] = 0xffff;
#ifdef USE_DIRECT_JUMP
/* the following two entries are optional (only used for string ops) */
tb->tb_jmp_offset[2] = 0xffff;
tb->tb_jmp_offset[3] = 0xffff;
#endif
return gen_intermediate_code_internal(env, tb,
tb->tc_ptr, gen_code_size_ptr,
0, NULL);
}
static uint8_t dummy_gen_code_buf[GEN_CODE_MAX_SIZE];
int cpu_restore_state_copy(TranslationBlock *tb,
CPUState *env, unsigned long searched_pc,
void *puc)
{
struct ucontext *uc = puc;
int ret, eflags;
/* find opc index corresponding to search_pc */
if (searched_pc < (unsigned long)tb->tc_ptr)
return -1;
searched_pc = searched_pc - (long)tb->tc_ptr + (long)dummy_gen_code_buf;
ret = gen_intermediate_code_internal(env, tb,
dummy_gen_code_buf, NULL,
1, (uint8_t *)searched_pc);
if (ret < 0)
return ret;
/* restore all the CPU state from the CPU context from the
signal. The FPU context stays in the host CPU. */
env->regs[R_EAX] = uc->uc_mcontext.gregs[REG_EAX];
env->regs[R_ECX] = uc->uc_mcontext.gregs[REG_ECX];
env->regs[R_EDX] = uc->uc_mcontext.gregs[REG_EDX];
env->regs[R_EBX] = uc->uc_mcontext.gregs[REG_EBX];
env->regs[R_ESP] = uc->uc_mcontext.gregs[REG_ESP];
env->regs[R_EBP] = uc->uc_mcontext.gregs[REG_EBP];
env->regs[R_ESI] = uc->uc_mcontext.gregs[REG_ESI];
env->regs[R_EDI] = uc->uc_mcontext.gregs[REG_EDI];
eflags = uc->uc_mcontext.gregs[REG_EFL];
env->df = 1 - (2 * ((eflags >> 10) & 1));
env->cc_src = eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
env->cc_op = CC_OP_EFLAGS;
return 0;
}
#endif /* USE_CODE_COPY */