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gerrit-public.fairphone.software / platform / external / valgrind / 870497a21f06d6e2aef0b1d6e53b869673a36f56 / . / vg_to_ucode.c
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/*--------------------------------------------------------------------*/
/*--- The JITter: translate x86 code to ucode. ---*/
/*--- vg_to_ucode.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, an x86 protected-mode emulator
designed for debugging and profiling binaries on x86-Unixes.
Copyright (C) 2000-2002 Julian Seward
jseward@acm.org
This program 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 2 of the
License, or (at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file LICENSE.
*/
#include "vg_include.h"
/*------------------------------------------------------------*/
/*--- Renamings of frequently-used global functions. ---*/
/*------------------------------------------------------------*/
#define uInstr0 VG_(newUInstr0)
#define uInstr1 VG_(newUInstr1)
#define uInstr2 VG_(newUInstr2)
#define uInstr3 VG_(newUInstr3)
#define dis VG_(disassemble)
#define nameIReg VG_(nameOfIntReg)
#define nameISize VG_(nameOfIntSize)
#define newTemp VG_(getNewTemp)
#define uLiteral VG_(setLiteralField)
/*------------------------------------------------------------*/
/*--- Here so it can be inlined everywhere. ---*/
/*------------------------------------------------------------*/
/* Allocate a new temp reg number. */
__inline__ Int VG_(getNewTemp) ( UCodeBlock* cb )
{
Int t = cb->nextTemp;
cb->nextTemp += 2;
return t;
}
Int VG_(getNewShadow) ( UCodeBlock* cb )
{
Int t = cb->nextTemp;
cb->nextTemp += 2;
return SHADOW(t);
}
/* Handy predicates. */
#define SMC_IF_SOME(cb) \
do { \
if (VG_(clo_smc_check) >= VG_CLO_SMC_SOME) { \
LAST_UINSTR((cb)).smc_check = True; \
} \
} while (0)
#define SMC_IF_ALL(cb) \
do { \
if (VG_(clo_smc_check) == VG_CLO_SMC_ALL) { \
LAST_UINSTR((cb)).smc_check = True; \
} \
} while (0)
/*------------------------------------------------------------*/
/*--- Helper bits and pieces for deconstructing the ---*/
/*--- x86 insn stream. ---*/
/*------------------------------------------------------------*/
static Char* nameGrp1 ( Int opc_aux )
{
static Char* grp1_names[8]
= { "add", "or", "adc", "sbb", "and", "sub", "xor", "cmp" };
if (opc_aux < 0 || opc_aux > 7) VG_(panic)("nameGrp1");
return grp1_names[opc_aux];
}
static Char* nameGrp2 ( Int opc_aux )
{
static Char* grp2_names[8]
= { "rol", "ror", "rcl", "rcr", "shl", "shr", "shl", "sar" };
if (opc_aux < 0 || opc_aux > 7) VG_(panic)("nameGrp2");
return grp2_names[opc_aux];
}
static Char* nameGrp4 ( Int opc_aux )
{
static Char* grp4_names[8]
= { "inc", "dec", "???", "???", "???", "???", "???", "???" };
if (opc_aux < 0 || opc_aux > 1) VG_(panic)("nameGrp4");
return grp4_names[opc_aux];
}
static Char* nameGrp5 ( Int opc_aux )
{
static Char* grp5_names[8]
= { "inc", "dec", "call*", "call*", "jmp*", "jmp*", "push", "???" };
if (opc_aux < 0 || opc_aux > 6) VG_(panic)("nameGrp5");
return grp5_names[opc_aux];
}
static Char* nameGrp8 ( Int opc_aux )
{
static Char* grp8_names[8]
= { "???", "???", "???", "???", "bt", "bts", "btr", "btc" };
if (opc_aux < 4 || opc_aux > 7) VG_(panic)("nameGrp8");
return grp8_names[opc_aux];
}
Char* VG_(nameOfIntReg) ( Int size, Int reg )
{
static Char* ireg32_names[8]
= { "%eax", "%ecx", "%edx", "%ebx",
"%esp", "%ebp", "%esi", "%edi" };
static Char* ireg16_names[8]
= { "%ax", "%cx", "%dx", "%bx", "%sp", "%bp", "%si", "%di" };
static Char* ireg8_names[8]
= { "%al", "%cl", "%dl", "%bl", "%ah{sp}", "%ch{bp}", "%dh{si}", "%bh{di}" };
if (reg < 0 || reg > 7) goto bad;
switch (size) {
case 4: return ireg32_names[reg];
case 2: return ireg16_names[reg];
case 1: return ireg8_names[reg];
}
bad:
VG_(panic)("nameOfIntReg");
return NULL; /*notreached*/
}
Char VG_(nameOfIntSize) ( Int size )
{
switch (size) {
case 4: return 'l';
case 2: return 'w';
case 1: return 'b';
default: VG_(panic)("nameOfIntSize");
}
}
__inline__ UInt VG_(extend_s_8to32) ( UInt x )
{
return (UInt)((((Int)x) << 24) >> 24);
}
__inline__ static UInt extend_s_16to32 ( UInt x )
{
return (UInt)((((Int)x) << 16) >> 16);
}
/* Get a byte value out of the insn stream and sign-extend to 32
bits. */
__inline__ static UInt getSDisp8 ( Addr eip0 )
{
UChar* eip = (UChar*)eip0;
return VG_(extend_s_8to32)( (UInt) (eip[0]) );
}
__inline__ static UInt getSDisp16 ( Addr eip0 )
{
UChar* eip = (UChar*)eip0;
UInt d = *eip++;
d |= ((*eip++) << 8);
return extend_s_16to32(d);
}
/* Get a 32-bit value out of the insn stream. */
__inline__ static UInt getUDisp32 ( Addr eip0 )
{
UChar* eip = (UChar*)eip0;
UInt v = eip[3]; v <<= 8;
v |= eip[2]; v <<= 8;
v |= eip[1]; v <<= 8;
v |= eip[0];
return v;
}
__inline__ static UInt getUDisp16 ( Addr eip0 )
{
UChar* eip = (UChar*)eip0;
UInt v = eip[1]; v <<= 8;
v |= eip[0];
return v;
}
__inline__ static UChar getUChar ( Addr eip0 )
{
UChar* eip = (UChar*)eip0;
return eip[0];
}
__inline__ static UInt LOW24 ( UInt x )
{
return x & 0x00FFFFFF;
}
__inline__ static UInt HI8 ( UInt x )
{
return x >> 24;
}
__inline__ static UInt getUDisp ( Int size, Addr eip )
{
switch (size) {
case 4: return getUDisp32(eip);
case 2: return getUDisp16(eip);
case 1: return getUChar(eip);
default: VG_(panic)("getUDisp");
}
return 0; /*notreached*/
}
__inline__ static UInt getSDisp ( Int size, Addr eip )
{
switch (size) {
case 4: return getUDisp32(eip);
case 2: return getSDisp16(eip);
case 1: return getSDisp8(eip);
default: VG_(panic)("getUDisp");
}
return 0; /*notreached*/
}
/*------------------------------------------------------------*/
/*--- Flag-related helpers. ---*/
/*------------------------------------------------------------*/
/* For the last uinsn inserted into cb, set the read, written and
undefined flags. Undefined flags are counted as written, but it
seems worthwhile to distinguish them.
*/
static __inline__ void uFlagsRWU ( UCodeBlock* cb,
FlagSet rr, FlagSet ww, FlagSet uu )
{
VG_(setFlagRW)(
&LAST_UINSTR(cb), rr, VG_UNION_FLAG_SETS(ww,uu)
);
}
static void setFlagsFromUOpcode ( UCodeBlock* cb, Int uopc )
{
switch (uopc) {
case XOR: case OR: case AND:
uFlagsRWU(cb, FlagsEmpty, FlagsOSZCP, FlagA); break;
case ADC: case SBB:
uFlagsRWU(cb, FlagC, FlagsOSZACP, FlagsEmpty); break;
case ADD: case SUB: case NEG:
uFlagsRWU(cb, FlagsEmpty, FlagsOSZACP, FlagsEmpty); break;
case INC: case DEC:
uFlagsRWU(cb, FlagsEmpty, FlagsOSZAP, FlagsEmpty); break;
case SHR: case SAR: case SHL:
uFlagsRWU(cb, FlagsEmpty, FlagsOSZCP, FlagA); break;
case ROL: case ROR:
uFlagsRWU(cb, FlagsEmpty, FlagsOC, FlagsEmpty); break;
case RCR: case RCL:
uFlagsRWU(cb, FlagC, FlagsOC, FlagsEmpty); break;
case NOT:
uFlagsRWU(cb, FlagsEmpty, FlagsEmpty, FlagsEmpty); break;
default:
VG_(printf)("unhandled case is %s\n",
VG_(nameUOpcode)(True, uopc));
VG_(panic)("setFlagsFromUOpcode: unhandled case");
}
}
static __inline__ void uCond ( UCodeBlock* cb, Condcode cond )
{
LAST_UINSTR(cb).cond = cond;
}
/*------------------------------------------------------------*/
/*--- Disassembling addressing modes ---*/
/*------------------------------------------------------------*/
/* Generate ucode to calculate an address indicated by a ModRM and
following SIB bytes, getting the value in a new temporary. The
temporary, and the number of bytes in the address mode, are
returned, as a pair (length << 8) | temp. Note that this fn should
not be called if the R/M part of the address denotes a register
instead of memory. If buf is non-NULL, text of the addressing mode
is placed therein. */
static UInt disAMode ( UCodeBlock* cb, Addr eip0, UChar* buf )
{
UChar* eip = (UChar*)eip0;
UChar mod_reg_rm = *eip++;
Int tmp = newTemp(cb);
/* squeeze out the reg field from mod_reg_rm, since a 256-entry
jump table seems a bit excessive.
*/
mod_reg_rm &= 0xC7; /* is now XX000YYY */
mod_reg_rm |= (mod_reg_rm >> 3); /* is now XX0XXYYY */
mod_reg_rm &= 0x1F; /* is now 000XXYYY */
switch (mod_reg_rm) {
/* (%eax) .. (%edi), not including (%esp) or (%ebp).
--> GET %reg, t
*/
case 0x00: case 0x01: case 0x02: case 0x03:
/* ! 04 */ /* ! 05 */ case 0x06: case 0x07:
{ UChar rm = mod_reg_rm;
uInstr2(cb, GET, 4, ArchReg, rm, TempReg, tmp);
if (buf) VG_(sprintf)(buf,"(%s)", nameIReg(4,rm));
return (1<<24 | tmp);
}
/* d8(%eax) ... d8(%edi), not including d8(%esp)
--> GET %reg, t ; ADDL d8, t
*/
case 0x08: case 0x09: case 0x0A: case 0x0B:
/* ! 0C */ case 0x0D: case 0x0E: case 0x0F:
{ UChar rm = mod_reg_rm & 7;
Int tmq = newTemp(cb);
UInt d = getSDisp8((Addr)eip); eip++;
uInstr2(cb, GET, 4, ArchReg, rm, TempReg, tmq);
uInstr2(cb, LEA1, 4, TempReg, tmq, TempReg, tmp);
LAST_UINSTR(cb).lit32 = d;
if (buf) VG_(sprintf)(buf,"%d(%s)", d, nameIReg(4,rm));
return (2<<24 | tmp);
}
/* d32(%eax) ... d32(%edi), not including d32(%esp)
--> GET %reg, t ; ADDL d8, t
*/
case 0x10: case 0x11: case 0x12: case 0x13:
/* ! 14 */ case 0x15: case 0x16: case 0x17:
{ UChar rm = mod_reg_rm & 7;
Int tmq = newTemp(cb);
UInt d = getUDisp32((Addr)eip); eip += 4;
uInstr2(cb, GET, 4, ArchReg, rm, TempReg, tmq);
uInstr2(cb, LEA1, 4, TempReg, tmq, TempReg, tmp);
LAST_UINSTR(cb).lit32 = d;
if (buf) VG_(sprintf)(buf,"0x%x(%s)", d, nameIReg(4,rm));
return (5<<24 | tmp);
}
/* a register, %eax .. %edi. This shouldn't happen. */
case 0x18: case 0x19: case 0x1A: case 0x1B:
case 0x1C: case 0x1D: case 0x1E: case 0x1F:
VG_(panic)("disAMode: not an addr!");
/* a 32-bit literal address
--> MOV d32, tmp
*/
case 0x05:
{ UInt d = getUDisp32((Addr)eip); eip += 4;
uInstr2(cb, MOV, 4, Literal, 0, TempReg, tmp);
uLiteral(cb, d);
if (buf) VG_(sprintf)(buf,"(0x%x)", d);
return (5<<24 | tmp);
}
case 0x04: {
/* SIB, with no displacement. Special cases:
-- %esp cannot act as an index value.
If index_r indicates %esp, zero is used for the index.
-- when mod is zero and base indicates EBP, base is instead
a 32-bit literal.
It's all madness, I tell you. Extract %index, %base and
scale from the SIB byte. The value denoted is then:
| %index == %ESP && %base == %EBP
= d32 following SIB byte
| %index == %ESP && %base != %EBP
= %base
| %index != %ESP && %base == %EBP
= d32 following SIB byte + (%index << scale)
| %index != %ESP && %base != %ESP
= %base + (%index << scale)
What happens to the souls of CPU architects who dream up such
horrendous schemes, do you suppose?
*/
UChar sib = *eip++;
UChar scale = (sib >> 6) & 3;
UChar index_r = (sib >> 3) & 7;
UChar base_r = sib & 7;
if (index_r != R_ESP && base_r != R_EBP) {
Int index_tmp = newTemp(cb);
Int base_tmp = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, index_r, TempReg, index_tmp);
uInstr2(cb, GET, 4, ArchReg, base_r, TempReg, base_tmp);
uInstr3(cb, LEA2, 4, TempReg, base_tmp, TempReg, index_tmp,
TempReg, tmp);
LAST_UINSTR(cb).lit32 = 0;
LAST_UINSTR(cb).extra4b = 1 << scale;
if (buf) VG_(sprintf)(buf,"(%s,%s,%d)", nameIReg(4,base_r),
nameIReg(4,index_r),1<<scale);
return (2<<24 | tmp);
}
if (index_r != R_ESP && base_r == R_EBP) {
Int index_tmp = newTemp(cb);
UInt d = getUDisp32((Addr)eip); eip += 4;
uInstr2(cb, GET, 4, ArchReg, index_r, TempReg, index_tmp);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, tmp);
uLiteral(cb, 0);
uInstr3(cb, LEA2, 4, TempReg, tmp, TempReg, index_tmp,
TempReg, tmp);
LAST_UINSTR(cb).lit32 = d;
LAST_UINSTR(cb).extra4b = 1 << scale;
if (buf) VG_(sprintf)(buf,"0x%x(,%s,%d)", d,
nameIReg(4,index_r),1<<scale);
return (6<<24 | tmp);
}
if (index_r == R_ESP && base_r != R_EBP) {
uInstr2(cb, GET, 4, ArchReg, base_r, TempReg, tmp);
if (buf) VG_(sprintf)(buf,"(%s,,)", nameIReg(4,base_r));
return (2<<24 | tmp);
}
if (index_r == R_ESP && base_r == R_EBP) {
UInt d = getUDisp32((Addr)eip); eip += 4;
uInstr2(cb, MOV, 4, Literal, 0, TempReg, tmp);
uLiteral(cb, d);
if (buf) VG_(sprintf)(buf,"0x%x()", d);
return (6<<24 | tmp);
}
vg_assert(0);
}
/* SIB, with 8-bit displacement. Special cases:
-- %esp cannot act as an index value.
If index_r indicates %esp, zero is used for the index.
Denoted value is:
| %index == %ESP
= d8 + %base
| %index != %ESP
= d8 + %base + (%index << scale)
*/
case 0x0C: {
UChar sib = *eip++;
UChar scale = (sib >> 6) & 3;
UChar index_r = (sib >> 3) & 7;
UChar base_r = sib & 7;
UInt d = getSDisp8((Addr)eip); eip++;
if (index_r == R_ESP) {
Int tmq = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, base_r, TempReg, tmq);
uInstr2(cb, LEA1, 4, TempReg, tmq, TempReg, tmp);
LAST_UINSTR(cb).lit32 = d;
if (buf) VG_(sprintf)(buf,"%d(%s,,)", d, nameIReg(4,base_r));
return (3<<24 | tmp);
} else {
Int index_tmp = newTemp(cb);
Int base_tmp = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, index_r, TempReg, index_tmp);
uInstr2(cb, GET, 4, ArchReg, base_r, TempReg, base_tmp);
uInstr3(cb, LEA2, 4, TempReg, base_tmp, TempReg, index_tmp,
TempReg, tmp);
LAST_UINSTR(cb).lit32 = d;
LAST_UINSTR(cb).extra4b = 1 << scale;
if (buf) VG_(sprintf)(buf,"%d(%s,%s,%d)", d, nameIReg(4,base_r),
nameIReg(4,index_r), 1<<scale);
return (3<<24 | tmp);
}
vg_assert(0);
}
/* SIB, with 32-bit displacement. Special cases:
-- %esp cannot act as an index value.
If index_r indicates %esp, zero is used for the index.
Denoted value is:
| %index == %ESP
= d32 + %base
| %index != %ESP
= d32 + %base + (%index << scale)
*/
case 0x14: {
UChar sib = *eip++;
UChar scale = (sib >> 6) & 3;
UChar index_r = (sib >> 3) & 7;
UChar base_r = sib & 7;
UInt d = getUDisp32((Addr)eip); eip += 4;
if (index_r == R_ESP) {
Int tmq = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, base_r, TempReg, tmq);
uInstr2(cb, LEA1, 4, TempReg, tmq, TempReg, tmp);
LAST_UINSTR(cb).lit32 = d;
if (buf) VG_(sprintf)(buf,"%d(%s,,)", d, nameIReg(4,base_r));
return (6<<24 | tmp);
} else {
Int index_tmp = newTemp(cb);
Int base_tmp = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, index_r, TempReg, index_tmp);
uInstr2(cb, GET, 4, ArchReg, base_r, TempReg, base_tmp);
uInstr3(cb, LEA2, 4, TempReg, base_tmp, TempReg, index_tmp,
TempReg, tmp);
LAST_UINSTR(cb).lit32 = d;
LAST_UINSTR(cb).extra4b = 1 << scale;
if (buf) VG_(sprintf)(buf,"%d(%s,%s,%d)", d, nameIReg(4,base_r),
nameIReg(4,index_r), 1<<scale);
return (6<<24 | tmp);
}
vg_assert(0);
}
default:
VG_(panic)("disAMode");
return 0; /*notreached*/
}
}
/* Figure out the number of (insn-stream) bytes constituting the amode
beginning at eip0. Is useful for getting hold of literals beyond
the end of the amode before it has been disassembled. */
static UInt lengthAMode ( Addr eip0 )
{
UChar* eip = (UChar*)eip0;
UChar mod_reg_rm = *eip++;
/* squeeze out the reg field from mod_reg_rm, since a 256-entry
jump table seems a bit excessive.
*/
mod_reg_rm &= 0xC7; /* is now XX000YYY */
mod_reg_rm |= (mod_reg_rm >> 3); /* is now XX0XXYYY */
mod_reg_rm &= 0x1F; /* is now 000XXYYY */
switch (mod_reg_rm) {
/* (%eax) .. (%edi), not including (%esp) or (%ebp). */
case 0x00: case 0x01: case 0x02: case 0x03:
/* ! 04 */ /* ! 05 */ case 0x06: case 0x07:
return 1;
/* d8(%eax) ... d8(%edi), not including d8(%esp). */
case 0x08: case 0x09: case 0x0A: case 0x0B:
/* ! 0C */ case 0x0D: case 0x0E: case 0x0F:
return 2;
/* d32(%eax) ... d32(%edi), not including d32(%esp). */
case 0x10: case 0x11: case 0x12: case 0x13:
/* ! 14 */ case 0x15: case 0x16: case 0x17:
return 5;
/* a register, %eax .. %edi. (Not an addr, but still handled.) */
case 0x18: case 0x19: case 0x1A: case 0x1B:
case 0x1C: case 0x1D: case 0x1E: case 0x1F:
return 1;
/* a 32-bit literal address. */
case 0x05: return 5;
/* SIB, no displacement. */
case 0x04: {
UChar sib = *eip++;
UChar base_r = sib & 7;
if (base_r == R_EBP) return 6; else return 2;
}
/* SIB, with 8-bit displacement. */
case 0x0C: return 3;
/* SIB, with 32-bit displacement. */
case 0x14: return 6;
default:
VG_(panic)("amode_from_RM");
return 0; /*notreached*/
}
}
/* Extract the reg field from a modRM byte. */
static __inline__ Int gregOfRM ( UChar mod_reg_rm )
{
return (Int)( (mod_reg_rm >> 3) & 7 );
}
/* Figure out whether the mod and rm parts of a modRM byte refer to a
register or memory. If so, the byte will have the form 11XXXYYY,
where YYY is the register number. */
static __inline__ Bool epartIsReg ( UChar mod_reg_rm )
{
return (0xC0 == (mod_reg_rm & 0xC0));
}
/* ... and extract the register number ... */
static __inline__ Int eregOfRM ( UChar mod_reg_rm )
{
return (Int)(mod_reg_rm & 0x7);
}
/*------------------------------------------------------------*/
/*--- Disassembling common idioms ---*/
/*------------------------------------------------------------*/
static
void codegen_XOR_reg_with_itself ( UCodeBlock* cb, Int size,
Int ge_reg, Int tmp )
{
if (dis)
VG_(printf)("xor%c %s, %s\n", nameISize(size),
nameIReg(size,ge_reg), nameIReg(size,ge_reg) );
uInstr2(cb, MOV, size, Literal, 0, TempReg, tmp);
uLiteral(cb, 0);
uInstr2(cb, XOR, size, TempReg, tmp, TempReg, tmp);
setFlagsFromUOpcode(cb, XOR);
uInstr2(cb, PUT, size, TempReg, tmp, ArchReg, ge_reg);
}
/* Handle binary integer instructions of the form
op E, G meaning
op reg-or-mem, reg
Is passed the a ptr to the modRM byte, the actual operation, and the
data size. Returns the address advanced completely over this
instruction.
E(src) is reg-or-mem
G(dst) is reg.
If E is reg, --> GET %G, tmp
OP %E, tmp
PUT tmp, %G
If E is mem and OP is not reversible,
--> (getAddr E) -> tmpa
LD (tmpa), tmpa
GET %G, tmp2
OP tmpa, tmp2
PUT tmp2, %G
If E is mem and OP is reversible
--> (getAddr E) -> tmpa
LD (tmpa), tmpa
OP %G, tmpa
PUT tmpa, %G
*/
static
Addr dis_op2_E_G ( UCodeBlock* cb,
Opcode opc,
Bool keep,
Int size,
Addr eip0,
Char* t_x86opc )
{
Bool reversible;
UChar rm = getUChar(eip0);
UChar dis_buf[50];
if (epartIsReg(rm)) {
Int tmp = newTemp(cb);
/* Specially handle XOR reg,reg, because that doesn't really
depend on reg, and doing the obvious thing potentially
generates a spurious value check failure due to the bogus
dependency. */
if (opc == XOR && gregOfRM(rm) == eregOfRM(rm)) {
codegen_XOR_reg_with_itself ( cb, size, gregOfRM(rm), tmp );
return 1+eip0;
}
uInstr2(cb, GET, size, ArchReg, gregOfRM(rm), TempReg, tmp);
if (opc == AND || opc == OR) {
Int tao = newTemp(cb);
uInstr2(cb, GET, size, ArchReg, eregOfRM(rm), TempReg, tao);
uInstr2(cb, opc, size, TempReg, tao, TempReg, tmp);
setFlagsFromUOpcode(cb, opc);
} else {
uInstr2(cb, opc, size, ArchReg, eregOfRM(rm), TempReg, tmp);
setFlagsFromUOpcode(cb, opc);
}
if (keep)
uInstr2(cb, PUT, size, TempReg, tmp, ArchReg, gregOfRM(rm));
if (dis) VG_(printf)("%s%c %s,%s\n", t_x86opc, nameISize(size),
nameIReg(size,eregOfRM(rm)),
nameIReg(size,gregOfRM(rm)));
return 1+eip0;
}
/* E refers to memory */
reversible
= (opc == ADD || opc == OR || opc == AND || opc == XOR || opc == ADC)
? True : False;
if (reversible) {
UInt pair = disAMode ( cb, eip0, dis?dis_buf:NULL);
Int tmpa = LOW24(pair);
uInstr2(cb, LOAD, size, TempReg, tmpa, TempReg, tmpa);
if (opc == AND || opc == OR) {
Int tao = newTemp(cb);
uInstr2(cb, GET, size, ArchReg, gregOfRM(rm), TempReg, tao);
uInstr2(cb, opc, size, TempReg, tao, TempReg, tmpa);
setFlagsFromUOpcode(cb, opc);
} else {
uInstr2(cb, opc, size, ArchReg, gregOfRM(rm), TempReg, tmpa);
setFlagsFromUOpcode(cb, opc);
}
if (keep)
uInstr2(cb, PUT, size, TempReg, tmpa, ArchReg, gregOfRM(rm));
if (dis) VG_(printf)("%s%c %s,%s\n", t_x86opc, nameISize(size),
dis_buf,nameIReg(size,gregOfRM(rm)));
return HI8(pair)+eip0;
} else {
UInt pair = disAMode ( cb, eip0, dis?dis_buf:NULL);
Int tmpa = LOW24(pair);
Int tmp2 = newTemp(cb);
uInstr2(cb, LOAD, size, TempReg, tmpa, TempReg, tmpa);
uInstr2(cb, GET, size, ArchReg, gregOfRM(rm), TempReg, tmp2);
uInstr2(cb, opc, size, TempReg, tmpa, TempReg, tmp2);
setFlagsFromUOpcode(cb, opc);
if (keep)
uInstr2(cb, PUT, size, TempReg, tmp2, ArchReg, gregOfRM(rm));
if (dis) VG_(printf)("%s%c %s,%s\n", t_x86opc, nameISize(size),
dis_buf,nameIReg(size,gregOfRM(rm)));
return HI8(pair)+eip0;
}
}
/* Handle binary integer instructions of the form
op G, E meaning
op reg, reg-or-mem
Is passed the a ptr to the modRM byte, the actual operation, and the
data size. Returns the address advanced completely over this
instruction.
G(src) is reg.
E(dst) is reg-or-mem
If E is reg, --> GET %E, tmp
OP %G, tmp
PUT tmp, %E
If E is mem, --> (getAddr E) -> tmpa
LD (tmpa), tmpv
OP %G, tmpv
ST tmpv, (tmpa)
*/
static
Addr dis_op2_G_E ( UCodeBlock* cb,
Opcode opc,
Bool keep,
Int size,
Addr eip0,
Char* t_x86opc )
{
UChar rm = getUChar(eip0);
UChar dis_buf[50];
if (epartIsReg(rm)) {
Int tmp = newTemp(cb);
/* Specially handle XOR reg,reg, because that doesn't really
depend on reg, and doing the obvious thing potentially
generates a spurious value check failure due to the bogus
dependency. */
if (opc == XOR && gregOfRM(rm) == eregOfRM(rm)) {
codegen_XOR_reg_with_itself ( cb, size, gregOfRM(rm), tmp );
return 1+eip0;
}
uInstr2(cb, GET, size, ArchReg, eregOfRM(rm), TempReg, tmp);
if (opc == AND || opc == OR) {
Int tao = newTemp(cb);
uInstr2(cb, GET, size, ArchReg, gregOfRM(rm), TempReg, tao);
uInstr2(cb, opc, size, TempReg, tao, TempReg, tmp);
setFlagsFromUOpcode(cb, opc);
} else {
uInstr2(cb, opc, size, ArchReg, gregOfRM(rm), TempReg, tmp);
setFlagsFromUOpcode(cb, opc);
}
if (keep)
uInstr2(cb, PUT, size, TempReg, tmp, ArchReg, eregOfRM(rm));
if (dis) VG_(printf)("%s%c %s,%s\n", t_x86opc, nameISize(size),
nameIReg(size,gregOfRM(rm)),
nameIReg(size,eregOfRM(rm)));
return 1+eip0;
}
/* E refers to memory */
{
UInt pair = disAMode ( cb, eip0, dis?dis_buf:NULL);
Int tmpa = LOW24(pair);
Int tmpv = newTemp(cb);
uInstr2(cb, LOAD, size, TempReg, tmpa, TempReg, tmpv);
if (opc == AND || opc == OR) {
Int tao = newTemp(cb);
uInstr2(cb, GET, size, ArchReg, gregOfRM(rm), TempReg, tao);
uInstr2(cb, opc, size, TempReg, tao, TempReg, tmpv);
setFlagsFromUOpcode(cb, opc);
} else {
uInstr2(cb, opc, size, ArchReg, gregOfRM(rm), TempReg, tmpv);
setFlagsFromUOpcode(cb, opc);
}
if (keep) {
uInstr2(cb, STORE, size, TempReg, tmpv, TempReg, tmpa);
SMC_IF_ALL(cb);
}
if (dis) VG_(printf)("%s%c %s,%s\n", t_x86opc, nameISize(size),
nameIReg(size,gregOfRM(rm)), dis_buf);
return HI8(pair)+eip0;
}
}
/* Handle move instructions of the form
mov E, G meaning
mov reg-or-mem, reg
Is passed the a ptr to the modRM byte, and the data size. Returns
the address advanced completely over this instruction.
E(src) is reg-or-mem
G(dst) is reg.
If E is reg, --> GET %G, tmpv
PUT tmpv, %G
If E is mem --> (getAddr E) -> tmpa
LD (tmpa), tmpb
PUT tmpb, %G
*/
static
Addr dis_mov_E_G ( UCodeBlock* cb,
Int size,
Addr eip0 )
{
UChar rm = getUChar(eip0);
UChar dis_buf[50];
if (epartIsReg(rm)) {
Int tmpv = newTemp(cb);
uInstr2(cb, GET, size, ArchReg, eregOfRM(rm), TempReg, tmpv);
uInstr2(cb, PUT, size, TempReg, tmpv, ArchReg, gregOfRM(rm));
if (dis) VG_(printf)("mov%c %s,%s\n", nameISize(size),
nameIReg(size,eregOfRM(rm)),
nameIReg(size,gregOfRM(rm)));
return 1+eip0;
}
/* E refers to memory */
{
UInt pair = disAMode ( cb, eip0, dis?dis_buf:NULL);
Int tmpa = LOW24(pair);
Int tmpb = newTemp(cb);
uInstr2(cb, LOAD, size, TempReg, tmpa, TempReg, tmpb);
uInstr2(cb, PUT, size, TempReg, tmpb, ArchReg, gregOfRM(rm));
if (dis) VG_(printf)("mov%c %s,%s\n", nameISize(size),
dis_buf,nameIReg(size,gregOfRM(rm)));
return HI8(pair)+eip0;
}
}
/* Handle move instructions of the form
mov G, E meaning
mov reg, reg-or-mem
Is passed the a ptr to the modRM byte, and the data size. Returns
the address advanced completely over this instruction.
G(src) is reg.
E(dst) is reg-or-mem
If E is reg, --> GET %G, tmp
PUT tmp, %E
If E is mem, --> (getAddr E) -> tmpa
GET %G, tmpv
ST tmpv, (tmpa)
*/
static
Addr dis_mov_G_E ( UCodeBlock* cb,
Int size,
Addr eip0 )
{
UChar rm = getUChar(eip0);
UChar dis_buf[50];
if (epartIsReg(rm)) {
Int tmpv = newTemp(cb);
uInstr2(cb, GET, size, ArchReg, gregOfRM(rm), TempReg, tmpv);
uInstr2(cb, PUT, size, TempReg, tmpv, ArchReg, eregOfRM(rm));
if (dis) VG_(printf)("mov%c %s,%s\n", nameISize(size),
nameIReg(size,gregOfRM(rm)),
nameIReg(size,eregOfRM(rm)));
return 1+eip0;
}
/* E refers to memory */
{
UInt pair = disAMode ( cb, eip0, dis?dis_buf:NULL);
Int tmpa = LOW24(pair);
Int tmpv = newTemp(cb);
uInstr2(cb, GET, size, ArchReg, gregOfRM(rm), TempReg, tmpv);
uInstr2(cb, STORE, size, TempReg, tmpv, TempReg, tmpa);
SMC_IF_SOME(cb);
if (dis) VG_(printf)("mov%c %s,%s\n", nameISize(size),
nameIReg(size,gregOfRM(rm)), dis_buf);
return HI8(pair)+eip0;
}
}
/* op $immediate, AL/AX/EAX. */
static
Addr dis_op_imm_A ( UCodeBlock* cb,
Int size,
Opcode opc,
Bool keep,
Addr eip,
Char* t_x86opc )
{
Int tmp = newTemp(cb);
UInt lit = getUDisp(size,eip);
uInstr2(cb, GET, size, ArchReg, R_EAX, TempReg, tmp);
if (opc == AND || opc == OR) {
Int tao = newTemp(cb);
uInstr2(cb, MOV, size, Literal, 0, TempReg, tao);
uLiteral(cb, lit);
uInstr2(cb, opc, size, TempReg, tao, TempReg, tmp);
setFlagsFromUOpcode(cb, opc);
} else {
uInstr2(cb, opc, size, Literal, 0, TempReg, tmp);
uLiteral(cb, lit);
setFlagsFromUOpcode(cb, opc);
}
if (keep)
uInstr2(cb, PUT, size, TempReg, tmp, ArchReg, R_EAX);
if (dis) VG_(printf)("%s%c $0x%x, %s\n", t_x86opc, nameISize(size),
lit, nameIReg(size,R_EAX));
return eip+size;
}
/* Sign- and Zero-extending moves. */
static
Addr dis_movx_E_G ( UCodeBlock* cb,
Addr eip, Int szs, Int szd, Bool sign_extend )
{
UChar dis_buf[50];
UChar rm = getUChar(eip);
if (epartIsReg(rm)) {
Int tmpv = newTemp(cb);
uInstr2(cb, GET, szs, ArchReg, eregOfRM(rm), TempReg, tmpv);
uInstr1(cb, WIDEN, szd, TempReg, tmpv);
LAST_UINSTR(cb).extra4b = szs;
LAST_UINSTR(cb).signed_widen = sign_extend;
uInstr2(cb, PUT, szd, TempReg, tmpv, ArchReg, gregOfRM(rm));
if (dis) VG_(printf)("mov%c%c%c %s,%s\n",
sign_extend ? 's' : 'z',
nameISize(szs), nameISize(szd),
nameIReg(szs,eregOfRM(rm)),
nameIReg(szd,gregOfRM(rm)));
return 1+eip;
}
/* E refers to memory */
{
UInt pair = disAMode ( cb, eip, dis?dis_buf:NULL);
Int tmpa = LOW24(pair);
uInstr2(cb, LOAD, szs, TempReg, tmpa, TempReg, tmpa);
uInstr1(cb, WIDEN, szd, TempReg, tmpa);
LAST_UINSTR(cb).extra4b = szs;
LAST_UINSTR(cb).signed_widen = sign_extend;
uInstr2(cb, PUT, szd, TempReg, tmpa, ArchReg, gregOfRM(rm));
if (dis) VG_(printf)("mov%c%c%c %s,%s\n",
sign_extend ? 's' : 'z',
nameISize(szs), nameISize(szd),
dis_buf,
nameIReg(szd,gregOfRM(rm)));
return HI8(pair)+eip;
}
}
/* Generate code to divide ArchRegs EDX:EAX / DX:AX / AX by the 32 /
16 / 8 bit quantity in the given TempReg. */
static
void codegen_div ( UCodeBlock* cb, Int sz, Int t, Bool signed_divide )
{
Int helper;
Int ta = newTemp(cb);
Int td = newTemp(cb);
switch (sz) {
case 4: helper = (signed_divide ? VGOFF_(helper_idiv_64_32)
: VGOFF_(helper_div_64_32));
break;
case 2: helper = (signed_divide ? VGOFF_(helper_idiv_32_16)
: VGOFF_(helper_div_32_16));
break;
case 1: helper = (signed_divide ? VGOFF_(helper_idiv_16_8)
: VGOFF_(helper_div_16_8));
break;
default: VG_(panic)("codegen_div");
}
uInstr0(cb, CALLM_S, 0);
if (sz == 4 || sz == 2) {
uInstr1(cb, PUSH, sz, TempReg, t);
uInstr2(cb, GET, sz, ArchReg, R_EAX, TempReg, ta);
uInstr1(cb, PUSH, sz, TempReg, ta);
uInstr2(cb, GET, sz, ArchReg, R_EDX, TempReg, td);
uInstr1(cb, PUSH, sz, TempReg, td);
uInstr1(cb, CALLM, 0, Lit16, helper);
uFlagsRWU(cb, FlagsEmpty, FlagsEmpty, FlagsOSZACP);
uInstr1(cb, POP, sz, TempReg, t);
uInstr2(cb, PUT, sz, TempReg, t, ArchReg, R_EDX);
uInstr1(cb, POP, sz, TempReg, t);
uInstr2(cb, PUT, sz, TempReg, t, ArchReg, R_EAX);
uInstr1(cb, CLEAR, 0, Lit16, 4);
} else {
uInstr1(cb, PUSH, 1, TempReg, t);
uInstr2(cb, GET, 2, ArchReg, R_EAX, TempReg, ta);
uInstr1(cb, PUSH, 2, TempReg, ta);
uInstr2(cb, MOV, 1, Literal, 0, TempReg, td);
uLiteral(cb, 0);
uInstr1(cb, PUSH, 1, TempReg, td);
uInstr1(cb, CALLM, 0, Lit16, helper);
uFlagsRWU(cb, FlagsEmpty, FlagsEmpty, FlagsOSZACP);
uInstr1(cb, POP, 1, TempReg, t);
uInstr2(cb, PUT, 1, TempReg, t, ArchReg, R_AL);
uInstr1(cb, POP, 1, TempReg, t);
uInstr2(cb, PUT, 1, TempReg, t, ArchReg, R_AH);
uInstr1(cb, CLEAR, 0, Lit16, 4);
}
uInstr0(cb, CALLM_E, 0);
}
static
Addr dis_Grp1 ( UCodeBlock* cb, Addr eip, UChar modrm,
Int am_sz, Int d_sz, Int sz, UInt d32 )
{
Int t1, t2, uopc;
UInt pair;
UChar dis_buf[50];
if (epartIsReg(modrm)) {
vg_assert(am_sz == 1);
t1 = newTemp(cb);
uInstr2(cb, GET, sz, ArchReg, eregOfRM(modrm), TempReg, t1);
switch (gregOfRM(modrm)) {
case 0: uopc = ADD; break; case 1: uopc = OR; break;
case 2: uopc = ADC; break; case 3: uopc = SBB; break;
case 4: uopc = AND; break; case 5: uopc = SUB; break;
case 6: uopc = XOR; break; case 7: uopc = SUB; break;
default: VG_(panic)("dis_Grp1(Reg): unhandled case");
}
if (uopc == AND || uopc == OR) {
Int tao = newTemp(cb);
uInstr2(cb, MOV, sz, Literal, 0, TempReg, tao);
uLiteral(cb, d32);
uInstr2(cb, uopc, sz, TempReg, tao, TempReg, t1);
setFlagsFromUOpcode(cb, uopc);
} else {
uInstr2(cb, uopc, sz, Literal, 0, TempReg, t1);
uLiteral(cb, d32);
setFlagsFromUOpcode(cb, uopc);
}
if (gregOfRM(modrm) < 7)
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, eregOfRM(modrm));
eip += (am_sz + d_sz);
if (dis)
VG_(printf)("%s%c $0x%x, %s\n",
nameGrp1(gregOfRM(modrm)), nameISize(sz), d32,
nameIReg(sz,eregOfRM(modrm)));
} else {
pair = disAMode ( cb, eip, dis?dis_buf:NULL);
t1 = LOW24(pair);
t2 = newTemp(cb);
eip += HI8(pair);
eip += d_sz;
uInstr2(cb, LOAD, sz, TempReg, t1, TempReg, t2);
switch (gregOfRM(modrm)) {
case 0: uopc = ADD; break; case 1: uopc = OR; break;
case 2: uopc = ADC; break; case 3: uopc = SBB; break;
case 4: uopc = AND; break; case 5: uopc = SUB; break;
case 6: uopc = XOR; break; case 7: uopc = SUB; break;
default: VG_(panic)("dis_Grp1(Mem): unhandled case");
}
if (uopc == AND || uopc == OR) {
Int tao = newTemp(cb);
uInstr2(cb, MOV, sz, Literal, 0, TempReg, tao);
uLiteral(cb, d32);
uInstr2(cb, uopc, sz, TempReg, tao, TempReg, t2);
setFlagsFromUOpcode(cb, uopc);
} else {
uInstr2(cb, uopc, sz, Literal, 0, TempReg, t2);
uLiteral(cb, d32);
setFlagsFromUOpcode(cb, uopc);
}
if (gregOfRM(modrm) < 7) {
uInstr2(cb, STORE, sz, TempReg, t2, TempReg, t1);
SMC_IF_ALL(cb);
}
if (dis)
VG_(printf)("%s%c $0x%x, %s\n",
nameGrp1(gregOfRM(modrm)), nameISize(sz), d32,
dis_buf);
}
return eip;
}
/* Group 2 extended opcodes. */
static
Addr dis_Grp2 ( UCodeBlock* cb, Addr eip, UChar modrm,
Int am_sz, Int d_sz, Int sz,
Tag orig_src_tag, UInt orig_src_val )
{
/* orig_src_tag and orig_src_val denote either ArchReg(%CL) or a
Literal. And eip on entry points at the modrm byte. */
Int t1, t2, uopc;
UInt pair;
UChar dis_buf[50];
UInt src_val;
Tag src_tag;
/* Get the amount to be shifted by into src_tag/src_val. */
if (orig_src_tag == ArchReg) {
src_val = newTemp(cb);
src_tag = TempReg;
uInstr2(cb, GET, 1, orig_src_tag, orig_src_val, TempReg, src_val);
} else {
src_val = orig_src_val;
src_tag = Literal;
}
if (epartIsReg(modrm)) {
vg_assert(am_sz == 1);
t1 = newTemp(cb);
uInstr2(cb, GET, sz, ArchReg, eregOfRM(modrm), TempReg, t1);
switch (gregOfRM(modrm)) {
case 0: uopc = ROL; break; case 1: uopc = ROR; break;
case 2: uopc = RCL; break; case 3: uopc = RCR; break;
case 4: uopc = SHL; break; case 5: uopc = SHR; break;
case 7: uopc = SAR; break;
default: VG_(panic)("dis_Grp2(Reg): unhandled case");
}
if (src_tag == Literal) {
uInstr2(cb, uopc, sz, Literal, 0, TempReg, t1);
uLiteral(cb, src_val);
} else {
uInstr2(cb, uopc, sz, src_tag, src_val, TempReg, t1);
}
setFlagsFromUOpcode(cb, uopc);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, eregOfRM(modrm));
eip += (am_sz + d_sz);
if (dis) {
if (orig_src_tag == Literal)
VG_(printf)("%s%c $0x%x, %s\n",
nameGrp2(gregOfRM(modrm)), nameISize(sz),
orig_src_val, nameIReg(sz,eregOfRM(modrm)));
else
VG_(printf)("%s%c %s, %s\n",
nameGrp2(gregOfRM(modrm)), nameISize(sz),
nameIReg(1,orig_src_val),
nameIReg(sz,eregOfRM(modrm)));
}
} else {
pair = disAMode ( cb, eip, dis?dis_buf:NULL);
t1 = LOW24(pair);
t2 = newTemp(cb);
eip += HI8(pair);
eip += d_sz;
uInstr2(cb, LOAD, sz, TempReg, t1, TempReg, t2);
switch (gregOfRM(modrm)) {
case 0: uopc = ROL; break; case 1: uopc = ROR; break;
case 2: uopc = RCL; break; case 3: uopc = RCR; break;
case 4: uopc = SHL; break; case 5: uopc = SHR; break;
case 7: uopc = SAR; break;
default: VG_(panic)("dis_Grp2(Reg): unhandled case");
}
if (src_tag == Literal) {
uInstr2(cb, uopc, sz, Literal, 0, TempReg, t2);
uLiteral(cb, src_val);
} else {
uInstr2(cb, uopc, sz, src_tag, src_val, TempReg, t2);
}
setFlagsFromUOpcode(cb, uopc);
uInstr2(cb, STORE, sz, TempReg, t2, TempReg, t1);
SMC_IF_ALL(cb);
if (dis) {
if (orig_src_tag == Literal)
VG_(printf)("%s%c $0x%x, %s\n",
nameGrp2(gregOfRM(modrm)), nameISize(sz),
orig_src_val, dis_buf);
else
VG_(printf)("%s%c %s, %s\n",
nameGrp2(gregOfRM(modrm)), nameISize(sz),
nameIReg(1,orig_src_val),
dis_buf);
}
}
return eip;
}
/* Group 8 extended opcodes (but BT/BTS/BTC/BTR only). */
static
Addr dis_Grp8_BT ( UCodeBlock* cb, Addr eip, UChar modrm,
Int am_sz, Int sz, UInt src_val )
{
# define MODIFY_t2_AND_SET_CARRY_FLAG \
/* t2 is the value to be op'd on. Copy to t_fetched, then \
modify t2, if non-BT. */ \
uInstr2(cb, MOV, 4, TempReg, t2, TempReg, t_fetched); \
uInstr2(cb, MOV, sz, Literal, 0, TempReg, t_mask); \
uLiteral(cb, v_mask); \
switch (gregOfRM(modrm)) { \
case 4: /* BT */ break; \
case 5: /* BTS */ \
uInstr2(cb, OR, sz, TempReg, t_mask, TempReg, t2); break; \
case 6: /* BTR */ \
uInstr2(cb, AND, sz, TempReg, t_mask, TempReg, t2); break; \
case 7: /* BTC */ \
uInstr2(cb, XOR, sz, TempReg, t_mask, TempReg, t2); break; \
} \
/* Copy relevant bit from t_fetched into carry flag. */ \
uInstr2(cb, SHR, sz, Literal, 0, TempReg, t_fetched); \
uLiteral(cb, src_val); \
uInstr2(cb, MOV, sz, Literal, 0, TempReg, t_mask); \
uLiteral(cb, 1); \
uInstr2(cb, AND, sz, TempReg, t_mask, TempReg, t_fetched); \
uInstr1(cb, NEG, sz, TempReg, t_fetched); \
setFlagsFromUOpcode(cb, NEG);
/* src_val denotes a d8.
And eip on entry points at the modrm byte. */
Int t1, t2, t_fetched, t_mask;
UInt pair;
UChar dis_buf[50];
UInt v_mask;
/* There is no 1-byte form of this instruction, AFAICS. */
vg_assert(sz == 2 || sz == 4);
/* Limit src_val -- the bit offset -- to something within a word.
The Intel docs say that literal offsets larger than a word are
masked in this way. */
switch (sz) {
case 2: src_val &= 15; break;
case 4: src_val &= 31; break;
default: VG_(panic)("dis_Grp8_BT: invalid size");
}
/* Invent a mask suitable for the operation. */
switch (gregOfRM(modrm)) {
case 4: /* BT */ v_mask = 0; break;
case 5: /* BTS */ v_mask = 1 << src_val; break;
case 6: /* BTR */ v_mask = ~(1 << src_val); break;
case 7: /* BTC */ v_mask = 1 << src_val; break;
/* If this needs to be extended, probably simplest to make a
new function to handle the other cases (0 .. 3). The
Intel docs do however not indicate any use for 0 .. 3, so
we don't expect this to happen. */
default: VG_(panic)("dis_Grp8_BT");
}
/* Probably excessively paranoid. */
if (sz == 2)
v_mask &= 0x0000FFFF;
t1 = INVALID_TEMPREG;
t_fetched = newTemp(cb);
t_mask = newTemp(cb);
if (epartIsReg(modrm)) {
vg_assert(am_sz == 1);
t2 = newTemp(cb);
/* Fetch the value to be tested and modified. */
uInstr2(cb, GET, sz, ArchReg, eregOfRM(modrm), TempReg, t2);
/* Do it! */
MODIFY_t2_AND_SET_CARRY_FLAG;
/* Dump the result back, if non-BT. */
if (gregOfRM(modrm) != 4 /* BT */)
uInstr2(cb, PUT, sz, TempReg, t2, ArchReg, eregOfRM(modrm));
eip += (am_sz + 1);
if (dis)
VG_(printf)("%s%c $0x%x, %s\n",
nameGrp8(gregOfRM(modrm)), nameISize(sz),
src_val,
nameIReg(sz,eregOfRM(modrm)));
} else {
pair = disAMode ( cb, eip, dis?dis_buf:NULL);
t1 = LOW24(pair);
t2 = newTemp(cb);
eip += HI8(pair);
eip += 1;
/* Fetch the value to be tested and modified. */
uInstr2(cb, LOAD, sz, TempReg, t1, TempReg, t2);
/* Do it! */
MODIFY_t2_AND_SET_CARRY_FLAG;
/* Dump the result back, if non-BT. */
if (gregOfRM(modrm) != 4 /* BT */) {
uInstr2(cb, STORE, sz, TempReg, t2, TempReg, t1);
SMC_IF_ALL(cb);
}
if (dis)
VG_(printf)("%s%c $0x%x, %s\n",
nameGrp8(gregOfRM(modrm)), nameISize(sz), src_val,
dis_buf);
}
return eip;
# undef MODIFY_t2_AND_SET_CARRY_FLAG
}
/* Generate ucode to multiply the value in EAX/AX/AL by the register
specified by the ereg of modrm, and park the result in
EDX:EAX/DX:AX/AX. */
static void codegen_mul_A_D_Reg ( UCodeBlock* cb, Int sz,
UChar modrm, Bool signed_multiply )
{
Int helper = signed_multiply
?
(sz==1 ? VGOFF_(helper_imul_8_16)
: (sz==2 ? VGOFF_(helper_imul_16_32)
: VGOFF_(helper_imul_32_64)))
:
(sz==1 ? VGOFF_(helper_mul_8_16)
: (sz==2 ? VGOFF_(helper_mul_16_32)
: VGOFF_(helper_mul_32_64)));
Int t1 = newTemp(cb);
Int ta = newTemp(cb);
uInstr0(cb, CALLM_S, 0);
uInstr2(cb, GET, sz, ArchReg, eregOfRM(modrm), TempReg, t1);
uInstr1(cb, PUSH, sz, TempReg, t1);
uInstr2(cb, GET, sz, ArchReg, R_EAX, TempReg, ta);
uInstr1(cb, PUSH, sz, TempReg, ta);
uInstr1(cb, CALLM, 0, Lit16, helper);
uFlagsRWU(cb, FlagsEmpty, FlagsOC, FlagsSZAP);
if (sz > 1) {
uInstr1(cb, POP, sz, TempReg, t1);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, R_EDX);
uInstr1(cb, POP, sz, TempReg, t1);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, R_EAX);
} else {
uInstr1(cb, CLEAR, 0, Lit16, 4);
uInstr1(cb, POP, 2, TempReg, t1);
uInstr2(cb, PUT, 2, TempReg, t1, ArchReg, R_EAX);
}
uInstr0(cb, CALLM_E, 0);
if (dis) VG_(printf)("%s%c %s\n", signed_multiply ? "imul" : "mul",
nameISize(sz), nameIReg(sz, eregOfRM(modrm)));
}
/* Generate ucode to multiply the value in EAX/AX/AL by the value in
TempReg temp, and park the result in EDX:EAX/DX:AX/AX. */
static void codegen_mul_A_D_Temp ( UCodeBlock* cb, Int sz,
Int temp, Bool signed_multiply,
UChar* dis_buf )
{
Int helper = signed_multiply
?
(sz==1 ? VGOFF_(helper_imul_8_16)
: (sz==2 ? VGOFF_(helper_imul_16_32)
: VGOFF_(helper_imul_32_64)))
:
(sz==1 ? VGOFF_(helper_mul_8_16)
: (sz==2 ? VGOFF_(helper_mul_16_32)
: VGOFF_(helper_mul_32_64)));
Int t1 = newTemp(cb);
uInstr0(cb, CALLM_S, 0);
uInstr1(cb, PUSH, sz, TempReg, temp);
uInstr2(cb, GET, sz, ArchReg, R_EAX, TempReg, t1);
uInstr1(cb, PUSH, sz, TempReg, t1);
uInstr1(cb, CALLM, 0, Lit16, helper);
uFlagsRWU(cb, FlagsEmpty, FlagsOC, FlagsSZAP);
if (sz > 1) {
uInstr1(cb, POP, sz, TempReg, t1);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, R_EDX);
uInstr1(cb, POP, sz, TempReg, t1);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, R_EAX);
} else {
uInstr1(cb, CLEAR, 0, Lit16, 4);
uInstr1(cb, POP, 2, TempReg, t1);
uInstr2(cb, PUT, 2, TempReg, t1, ArchReg, R_EAX);
}
uInstr0(cb, CALLM_E, 0);
if (dis) VG_(printf)("%s%c %s\n", signed_multiply ? "imul" : "mul",
nameISize(sz), dis_buf);
}
/* Group 3 extended opcodes. */
static
Addr dis_Grp3 ( UCodeBlock* cb, Int sz, Addr eip )
{
Int t1, t2;
UInt pair, d32;
UChar modrm;
UChar dis_buf[50];
t1 = t2 = INVALID_TEMPREG;
modrm = getUChar(eip);
if (epartIsReg(modrm)) {
t1 = newTemp(cb);
switch (gregOfRM(modrm)) {
case 0: { /* TEST */
Int tao = newTemp(cb);
eip++; d32 = getUDisp(sz, eip); eip += sz;
uInstr2(cb, GET, sz, ArchReg, eregOfRM(modrm), TempReg, t1);
uInstr2(cb, MOV, sz, Literal, 0, TempReg, tao);
uLiteral(cb, d32);
uInstr2(cb, AND, sz, TempReg, tao, TempReg, t1);
setFlagsFromUOpcode(cb, AND);
if (dis)
VG_(printf)("test%c $0x%x, %s\n",
nameISize(sz), d32, nameIReg(sz, eregOfRM(modrm)));
break;
}
case 2: /* NOT */
eip++;
uInstr2(cb, GET, sz, ArchReg, eregOfRM(modrm), TempReg, t1);
uInstr1(cb, NOT, sz, TempReg, t1);
setFlagsFromUOpcode(cb, NOT);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, eregOfRM(modrm));
if (dis)
VG_(printf)("not%c %s\n",
nameISize(sz), nameIReg(sz, eregOfRM(modrm)));
break;
case 3: /* NEG */
eip++;
uInstr2(cb, GET, sz, ArchReg, eregOfRM(modrm), TempReg, t1);
uInstr1(cb, NEG, sz, TempReg, t1);
setFlagsFromUOpcode(cb, NEG);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, eregOfRM(modrm));
if (dis)
VG_(printf)("neg%c %s\n",
nameISize(sz), nameIReg(sz, eregOfRM(modrm)));
break;
case 4: /* MUL */
eip++;
codegen_mul_A_D_Reg ( cb, sz, modrm, False );
break;
case 5: /* IMUL */
eip++;
codegen_mul_A_D_Reg ( cb, sz, modrm, True );
break;
case 6: /* DIV */
eip++;
uInstr2(cb, GET, sz, ArchReg, eregOfRM(modrm), TempReg, t1);
codegen_div ( cb, sz, t1, False );
if (dis)
VG_(printf)("div%c %s\n", nameISize(sz),
nameIReg(sz, eregOfRM(modrm)));
break;
case 7: /* IDIV */
eip++;
uInstr2(cb, GET, sz, ArchReg, eregOfRM(modrm), TempReg, t1);
codegen_div ( cb, sz, t1, True );
if (dis)
VG_(printf)("idiv%c %s\n", nameISize(sz),
nameIReg(sz, eregOfRM(modrm)));
break;
default:
VG_(printf)(
"unhandled Grp3(R) case %d\n", (UInt)gregOfRM(modrm));
VG_(panic)("Grp3");
}
} else {
pair = disAMode ( cb, eip, dis?dis_buf:NULL );
t2 = LOW24(pair);
t1 = newTemp(cb);
eip += HI8(pair);
uInstr2(cb, LOAD, sz, TempReg, t2, TempReg, t1);
switch (gregOfRM(modrm)) {
case 0: { /* TEST */
Int tao = newTemp(cb);
d32 = getUDisp(sz, eip); eip += sz;
uInstr2(cb, MOV, sz, Literal, 0, TempReg, tao);
uLiteral(cb, d32);
uInstr2(cb, AND, sz, TempReg, tao, TempReg, t1);
setFlagsFromUOpcode(cb, AND);
if (dis)
VG_(printf)("test%c $0x%x, %s\n",
nameISize(sz), d32, dis_buf);
break;
}
case 2: /* NOT */
uInstr1(cb, NOT, sz, TempReg, t1);
setFlagsFromUOpcode(cb, NOT);
uInstr2(cb, STORE, sz, TempReg, t1, TempReg, t2);
SMC_IF_ALL(cb);
if (dis)
VG_(printf)("not%c %s\n", nameISize(sz), dis_buf);
break;
case 3: /* NEG */
uInstr1(cb, NEG, sz, TempReg, t1);
setFlagsFromUOpcode(cb, NEG);
uInstr2(cb, STORE, sz, TempReg, t1, TempReg, t2);
SMC_IF_ALL(cb);
if (dis)
VG_(printf)("neg%c %s\n", nameISize(sz), dis_buf);
break;
case 4: /* MUL */
codegen_mul_A_D_Temp ( cb, sz, t1, False,
dis?dis_buf:NULL );
break;
case 5: /* IMUL */
codegen_mul_A_D_Temp ( cb, sz, t1, True, dis?dis_buf:NULL );
break;
case 6: /* DIV */
codegen_div ( cb, sz, t1, False );
if (dis)
VG_(printf)("div%c %s\n", nameISize(sz), dis_buf);
break;
case 7: /* IDIV */
codegen_div ( cb, sz, t1, True );
if (dis)
VG_(printf)("idiv%c %s\n", nameISize(sz), dis_buf);
break;
default:
VG_(printf)(
"unhandled Grp3(M) case %d\n", (UInt)gregOfRM(modrm));
VG_(panic)("Grp3");
}
}
return eip;
}
/* Group 4 extended opcodes. */
static
Addr dis_Grp4 ( UCodeBlock* cb, Addr eip )
{
Int t1, t2;
UInt pair;
UChar modrm;
UChar dis_buf[50];
t1 = t2 = INVALID_TEMPREG;
modrm = getUChar(eip);
if (epartIsReg(modrm)) {
t1 = newTemp(cb);
uInstr2(cb, GET, 1, ArchReg, eregOfRM(modrm), TempReg, t1);
switch (gregOfRM(modrm)) {
case 0: /* INC */
uInstr1(cb, INC, 1, TempReg, t1);
setFlagsFromUOpcode(cb, INC);
uInstr2(cb, PUT, 1, TempReg, t1, ArchReg, eregOfRM(modrm));
break;
case 1: /* DEC */
uInstr1(cb, DEC, 1, TempReg, t1);
setFlagsFromUOpcode(cb, DEC);
uInstr2(cb, PUT, 1, TempReg, t1, ArchReg, eregOfRM(modrm));
break;
default:
VG_(printf)(
"unhandled Grp4(R) case %d\n", (UInt)gregOfRM(modrm));
VG_(panic)("Grp4");
}
eip++;
if (dis)
VG_(printf)("%sb %s\n", nameGrp4(gregOfRM(modrm)),
nameIReg(1, eregOfRM(modrm)));
} else {
pair = disAMode ( cb, eip, dis?dis_buf:NULL );
t2 = LOW24(pair);
t1 = newTemp(cb);
uInstr2(cb, LOAD, 1, TempReg, t2, TempReg, t1);
switch (gregOfRM(modrm)) {
case 0: /* INC */
uInstr1(cb, INC, 1, TempReg, t1);
setFlagsFromUOpcode(cb, INC);
uInstr2(cb, STORE, 1, TempReg, t1, TempReg, t2);
SMC_IF_ALL(cb);
break;
case 1: /* DEC */
uInstr1(cb, DEC, 1, TempReg, t1);
setFlagsFromUOpcode(cb, DEC);
uInstr2(cb, STORE, 1, TempReg, t1, TempReg, t2);
SMC_IF_ALL(cb);
break;
default:
VG_(printf)(
"unhandled Grp4(M) case %d\n", (UInt)gregOfRM(modrm));
VG_(panic)("Grp4");
}
eip += HI8(pair);
if (dis)
VG_(printf)("%sb %s\n", nameGrp4(gregOfRM(modrm)), dis_buf);
}
return eip;
}
/* Group 5 extended opcodes. */
static
Addr dis_Grp5 ( UCodeBlock* cb, Int sz, Addr eip, Bool* isEnd )
{
Int t1, t2, t3, t4;
UInt pair;
UChar modrm;
UChar dis_buf[50];
t1 = t2 = t3 = t4 = INVALID_TEMPREG;
modrm = getUChar(eip);
if (epartIsReg(modrm)) {
t1 = newTemp(cb);
uInstr2(cb, GET, sz, ArchReg, eregOfRM(modrm), TempReg, t1);
switch (gregOfRM(modrm)) {
case 0: /* INC */
uInstr1(cb, INC, sz, TempReg, t1);
setFlagsFromUOpcode(cb, INC);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, eregOfRM(modrm));
break;
case 1: /* DEC */
uInstr1(cb, DEC, sz, TempReg, t1);
setFlagsFromUOpcode(cb, DEC);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, eregOfRM(modrm));
break;
case 2: /* call Ev */
t3 = newTemp(cb); t4 = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ESP, TempReg, t3);
uInstr2(cb, SUB, 4, Literal, 0, TempReg, t3);
uLiteral(cb, 4);
uInstr2(cb, PUT, 4, TempReg, t3, ArchReg, R_ESP);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, t4);
uLiteral(cb, eip+1);
uInstr2(cb, STORE, 4, TempReg, t4, TempReg, t3);
SMC_IF_ALL(cb);
uInstr1(cb, JMP, 0, TempReg, t1);
uCond(cb, CondAlways);
LAST_UINSTR(cb).jmpkind = JmpCall;
*isEnd = True;
break;
case 4: /* jmp Ev */
uInstr1(cb, JMP, 0, TempReg, t1);
uCond(cb, CondAlways);
*isEnd = True;
break;
default:
VG_(printf)(
"unhandled Grp5(R) case %d\n", (UInt)gregOfRM(modrm));
VG_(panic)("Grp5");
}
eip++;
if (dis)
VG_(printf)("%s%c %s\n", nameGrp5(gregOfRM(modrm)),
nameISize(sz), nameIReg(sz, eregOfRM(modrm)));
} else {
pair = disAMode ( cb, eip, dis?dis_buf:NULL );
t2 = LOW24(pair);
t1 = newTemp(cb);
uInstr2(cb, LOAD, sz, TempReg, t2, TempReg, t1);
switch (gregOfRM(modrm)) {
case 0: /* INC */
uInstr1(cb, INC, sz, TempReg, t1);
setFlagsFromUOpcode(cb, INC);
uInstr2(cb, STORE, sz, TempReg, t1, TempReg, t2);
SMC_IF_ALL(cb);
break;
case 1: /* DEC */
uInstr1(cb, DEC, sz, TempReg, t1);
setFlagsFromUOpcode(cb, DEC);
uInstr2(cb, STORE, sz, TempReg, t1, TempReg, t2);
SMC_IF_ALL(cb);
break;
case 2: /* call Ev */
t3 = newTemp(cb); t4 = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ESP, TempReg, t3);
uInstr2(cb, SUB, 4, Literal, 0, TempReg, t3);
uLiteral(cb, 4);
uInstr2(cb, PUT, 4, TempReg, t3, ArchReg, R_ESP);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, t4);
uLiteral(cb, eip+HI8(pair));
uInstr2(cb, STORE, 4, TempReg, t4, TempReg, t3);
SMC_IF_ALL(cb);
uInstr1(cb, JMP, 0, TempReg, t1);
uCond(cb, CondAlways);
LAST_UINSTR(cb).jmpkind = JmpCall;
*isEnd = True;
break;
case 4: /* JMP Ev */
uInstr1(cb, JMP, 0, TempReg, t1);
uCond(cb, CondAlways);
*isEnd = True;
break;
case 6: /* PUSH Ev */
t3 = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ESP, TempReg, t3);
uInstr2(cb, SUB, 4, Literal, 0, TempReg, t3);
uLiteral(cb, sz);
uInstr2(cb, PUT, 4, TempReg, t3, ArchReg, R_ESP);
uInstr2(cb, STORE, sz, TempReg, t1, TempReg, t3);
SMC_IF_ALL(cb);
break;
default:
VG_(printf)(
"unhandled Grp5(M) case %d\n", (UInt)gregOfRM(modrm));
VG_(panic)("Grp5");
}
eip += HI8(pair);
if (dis)
VG_(printf)("%s%c %s\n", nameGrp5(gregOfRM(modrm)),
nameISize(sz), dis_buf);
}
return eip;
}
/* Template for REPE CMPS<sz>. Assumes this insn is the last one in
the basic block, and so emits a jump to the next insn. */
static
void codegen_REPE_CMPS ( UCodeBlock* cb, Int sz, Addr eip, Addr eip_next )
{
Int tc, /* ECX */
td, /* EDI */ ts, /* ESI */
tdv, /* (EDI) */ tsv /* (ESI) */;
tdv = newTemp(cb);
tsv = newTemp(cb);
td = newTemp(cb);
ts = newTemp(cb);
tc = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ECX, TempReg, tc);
uInstr2(cb, JIFZ, 4, TempReg, tc, Literal, 0);
uLiteral(cb, eip_next);
uInstr1(cb, DEC, 4, TempReg, tc);
uInstr2(cb, PUT, 4, TempReg, tc, ArchReg, R_ECX);
uInstr2(cb, GET, 4, ArchReg, R_EDI, TempReg, td);
uInstr2(cb, GET, 4, ArchReg, R_ESI, TempReg, ts);
uInstr2(cb, LOAD, sz, TempReg, td, TempReg, tdv);
uInstr2(cb, LOAD, sz, TempReg, ts, TempReg, tsv);
uInstr2(cb, SUB, sz, TempReg, tdv, TempReg, tsv);
setFlagsFromUOpcode(cb, SUB);
uInstr0(cb, CALLM_S, 0);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, tdv);
uLiteral(cb, 0);
uInstr1(cb, PUSH, 4, TempReg, tdv);
uInstr1(cb, CALLM, 0, Lit16, VGOFF_(helper_get_dirflag));
uFlagsRWU(cb, FlagD, FlagsEmpty, FlagsEmpty);
uInstr1(cb, POP, 4, TempReg, tdv);
uInstr0(cb, CALLM_E, 0);
if (sz == 4 || sz == 2) {
uInstr2(cb, SHL, 4, Literal, 0, TempReg, tdv);
uLiteral(cb, sz/2);
}
uInstr2(cb, ADD, 4, TempReg, tdv, TempReg, td);
uInstr2(cb, ADD, 4, TempReg, tdv, TempReg, ts);
uInstr2(cb, PUT, 4, TempReg, td, ArchReg, R_EDI);
uInstr2(cb, PUT, 4, TempReg, ts, ArchReg, R_ESI);
uInstr1(cb, JMP, 0, Literal, 0);
uLiteral(cb, eip);
uCond(cb, CondZ);
uFlagsRWU(cb, FlagsOSZACP, FlagsEmpty, FlagsEmpty);
uInstr1(cb, JMP, 0, Literal, 0);
uLiteral(cb, eip_next);
uCond(cb, CondAlways);
}
/* Template for REPNE SCAS<sz>. Assumes this insn is the last one in
the basic block, and so emits a jump to the next insn. */
static
void codegen_REPNE_SCAS ( UCodeBlock* cb, Int sz, Addr eip, Addr eip_next )
{
Int ta /* EAX */, tc /* ECX */, td /* EDI */, tv;
ta = newTemp(cb);
tc = newTemp(cb);
tv = newTemp(cb);
td = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ECX, TempReg, tc);
uInstr2(cb, JIFZ, 4, TempReg, tc, Literal, 0);
uLiteral(cb, eip_next);
uInstr1(cb, DEC, 4, TempReg, tc);
uInstr2(cb, PUT, 4, TempReg, tc, ArchReg, R_ECX);
uInstr2(cb, GET, sz, ArchReg, R_EAX, TempReg, ta);
uInstr2(cb, GET, 4, ArchReg, R_EDI, TempReg, td);
uInstr2(cb, LOAD, sz, TempReg, td, TempReg, tv);
/* next uinstr kills ta, but that's ok -- don't need it again */
uInstr2(cb, SUB, sz, TempReg, tv, TempReg, ta);
setFlagsFromUOpcode(cb, SUB);
uInstr0(cb, CALLM_S, 0);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, tv);
uLiteral(cb, 0);
uInstr1(cb, PUSH, 4, TempReg, tv);
uInstr1(cb, CALLM, 0, Lit16, VGOFF_(helper_get_dirflag));
uFlagsRWU(cb, FlagD, FlagsEmpty, FlagsEmpty);
uInstr1(cb, POP, 4, TempReg, tv);
uInstr0(cb, CALLM_E, 0);
if (sz == 4 || sz == 2) {
uInstr2(cb, SHL, 4, Literal, 0, TempReg, tv);
uLiteral(cb, sz/2);
}
uInstr2(cb, ADD, 4, TempReg, tv, TempReg, td);
uInstr2(cb, PUT, 4, TempReg, td, ArchReg, R_EDI);
uInstr1(cb, JMP, 0, Literal, 0);
uLiteral(cb, eip);
uCond(cb, CondNZ);
uFlagsRWU(cb, FlagsOSZACP, FlagsEmpty, FlagsEmpty);
uInstr1(cb, JMP, 0, Literal, 0);
uLiteral(cb, eip_next);
uCond(cb, CondAlways);
}
/* Template for REPE MOVS<sz>. Assumes this insn is the last one in
the basic block, and so emits a jump to the next insn. */
static
void codegen_REPE_MOVS ( UCodeBlock* cb, Int sz, Addr eip, Addr eip_next )
{
Int ts /* ESI */, tc /* ECX */, td /* EDI */, tv;
tc = newTemp(cb);
td = newTemp(cb);
ts = newTemp(cb);
tv = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ECX, TempReg, tc);
uInstr2(cb, JIFZ, 4, TempReg, tc, Literal, 0);
uLiteral(cb, eip_next);
uInstr1(cb, DEC, 4, TempReg, tc);
uInstr2(cb, PUT, 4, TempReg, tc, ArchReg, R_ECX);
uInstr2(cb, GET, 4, ArchReg, R_EDI, TempReg, td);
uInstr2(cb, GET, 4, ArchReg, R_ESI, TempReg, ts);
uInstr2(cb, LOAD, sz, TempReg, ts, TempReg, tv);
uInstr2(cb, STORE, sz, TempReg, tv, TempReg, td);
SMC_IF_SOME(cb);
uInstr0(cb, CALLM_S, 0);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, tv);
uLiteral(cb, 0);
uInstr1(cb, PUSH, 4, TempReg, tv);
uInstr1(cb, CALLM, 0, Lit16, VGOFF_(helper_get_dirflag));
uFlagsRWU(cb, FlagD, FlagsEmpty, FlagsEmpty);
uInstr1(cb, POP, 4, TempReg, tv);
uInstr0(cb, CALLM_E, 0);
if (sz == 4 || sz == 2) {
uInstr2(cb, SHL, 4, Literal, 0, TempReg, tv);
uLiteral(cb, sz/2);
}
uInstr2(cb, ADD, 4, TempReg, tv, TempReg, td);
uInstr2(cb, ADD, 4, TempReg, tv, TempReg, ts);
uInstr2(cb, PUT, 4, TempReg, td, ArchReg, R_EDI);
uInstr2(cb, PUT, 4, TempReg, ts, ArchReg, R_ESI);
uInstr1(cb, JMP, 0, Literal, 0);
uLiteral(cb, eip);
uCond(cb, CondAlways);
}
/* Template for REPE STOS<sz>. Assumes this insn is the last one in
the basic block, and so emits a jump to the next insn. */
static
void codegen_REPE_STOS ( UCodeBlock* cb, Int sz, Addr eip, Addr eip_next )
{
Int ta /* EAX */, tc /* ECX */, td /* EDI */;
ta = newTemp(cb);
tc = newTemp(cb);
td = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ECX, TempReg, tc);
uInstr2(cb, JIFZ, 4, TempReg, tc, Literal, 0);
uLiteral(cb, eip_next);
uInstr1(cb, DEC, 4, TempReg, tc);
uInstr2(cb, PUT, 4, TempReg, tc, ArchReg, R_ECX);
uInstr2(cb, GET, sz, ArchReg, R_EAX, TempReg, ta);
uInstr2(cb, GET, 4, ArchReg, R_EDI, TempReg, td);
uInstr2(cb, STORE, sz, TempReg, ta, TempReg, td);
SMC_IF_SOME(cb);
uInstr0(cb, CALLM_S, 0);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, ta);
uLiteral(cb, 0);
uInstr1(cb, PUSH, 4, TempReg, ta);
uInstr1(cb, CALLM, 0, Lit16, VGOFF_(helper_get_dirflag));
uFlagsRWU(cb, FlagD, FlagsEmpty, FlagsEmpty);
uInstr1(cb, POP, 4, TempReg, ta);
uInstr0(cb, CALLM_E, 0);
if (sz == 4 || sz == 2) {
uInstr2(cb, SHL, 4, Literal, 0, TempReg, ta);
uLiteral(cb, sz/2);
}
uInstr2(cb, ADD, 4, TempReg, ta, TempReg, td);
uInstr2(cb, PUT, 4, TempReg, td, ArchReg, R_EDI);
uInstr1(cb, JMP, 0, Literal, 0);
uLiteral(cb, eip);
uCond(cb, CondAlways);
}
/* Template for CMPS<sz>, _not_ preceded by a REP prefix. */
static
void codegen_CMPS ( UCodeBlock* cb, Int sz )
{
Int td, /* EDI */ ts, /* ESI */
tdv, /* (EDI) */ tsv /* (ESI) */;
tdv = newTemp(cb);
tsv = newTemp(cb);
td = newTemp(cb);
ts = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_EDI, TempReg, td);
uInstr2(cb, GET, 4, ArchReg, R_ESI, TempReg, ts);
uInstr2(cb, LOAD, sz, TempReg, td, TempReg, tdv);
uInstr2(cb, LOAD, sz, TempReg, ts, TempReg, tsv);
uInstr2(cb, SUB, sz, TempReg, tdv, TempReg, tsv);
setFlagsFromUOpcode(cb, SUB);
uInstr0(cb, CALLM_S, 0);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, tdv);
uLiteral(cb, 0);
uInstr1(cb, PUSH, 4, TempReg, tdv);
uInstr1(cb, CALLM, 0, Lit16, VGOFF_(helper_get_dirflag));
uFlagsRWU(cb, FlagD, FlagsEmpty, FlagsEmpty);
uInstr1(cb, POP, 4, TempReg, tdv);
uInstr0(cb, CALLM_E, 0);
if (sz == 4 || sz == 2) {
uInstr2(cb, SHL, 4, Literal, 0, TempReg, tdv);
uLiteral(cb, sz/2);
}
uInstr2(cb, ADD, 4, TempReg, tdv, TempReg, td);
uInstr2(cb, ADD, 4, TempReg, tdv, TempReg, ts);
uInstr2(cb, PUT, 4, TempReg, td, ArchReg, R_EDI);
uInstr2(cb, PUT, 4, TempReg, ts, ArchReg, R_ESI);
}
/* Template for MOVS<sz>, _not_ preceded by a REP prefix. */
static
void codegen_MOVS ( UCodeBlock* cb, Int sz )
{
Int tv, /* the value being copied */
td, /* EDI */ ts /* ESI */;
tv = newTemp(cb);
td = newTemp(cb);
ts = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_EDI, TempReg, td);
uInstr2(cb, GET, 4, ArchReg, R_ESI, TempReg, ts);
uInstr2(cb, LOAD, sz, TempReg, ts, TempReg, tv);
uInstr2(cb, STORE, sz, TempReg, tv, TempReg, td);
SMC_IF_SOME(cb);
uInstr0(cb, CALLM_S, 0);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, tv);
uLiteral(cb, 0);
uInstr1(cb, PUSH, 4, TempReg, tv);
uInstr1(cb, CALLM, 0, Lit16, VGOFF_(helper_get_dirflag));
uFlagsRWU(cb, FlagD, FlagsEmpty, FlagsEmpty);
uInstr1(cb, POP, 4, TempReg, tv);
uInstr0(cb, CALLM_E, 0);
if (sz == 4 || sz == 2) {
uInstr2(cb, SHL, 4, Literal, 0, TempReg, tv);
uLiteral(cb, sz/2);
}
uInstr2(cb, ADD, 4, TempReg, tv, TempReg, td);
uInstr2(cb, ADD, 4, TempReg, tv, TempReg, ts);
uInstr2(cb, PUT, 4, TempReg, td, ArchReg, R_EDI);
uInstr2(cb, PUT, 4, TempReg, ts, ArchReg, R_ESI);
}
/* Template for STOS<sz>, _not_ preceded by a REP prefix. */
static
void codegen_STOS ( UCodeBlock* cb, Int sz )
{
Int ta /* EAX */, td /* EDI */;
ta = newTemp(cb);
td = newTemp(cb);
uInstr2(cb, GET, sz, ArchReg, R_EAX, TempReg, ta);
uInstr2(cb, GET, 4, ArchReg, R_EDI, TempReg, td);
uInstr2(cb, STORE, sz, TempReg, ta, TempReg, td);
SMC_IF_SOME(cb);
uInstr0(cb, CALLM_S, 0);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, ta);
uLiteral(cb, 0);
uInstr1(cb, PUSH, 4, TempReg, ta);
uInstr1(cb, CALLM, 0, Lit16, VGOFF_(helper_get_dirflag));
uFlagsRWU(cb, FlagD, FlagsEmpty, FlagsEmpty);
uInstr1(cb, POP, 4, TempReg, ta);
uInstr0(cb, CALLM_E, 0);
if (sz == 4 || sz == 2) {
uInstr2(cb, SHL, 4, Literal, 0, TempReg, ta);
uLiteral(cb, sz/2);
}
uInstr2(cb, ADD, 4, TempReg, ta, TempReg, td);
uInstr2(cb, PUT, 4, TempReg, td, ArchReg, R_EDI);
}
/* Template for LODS<sz>, _not_ preceded by a REP prefix. */
static
void codegen_LODS ( UCodeBlock* cb, Int sz )
{
Int ta /* EAX */, ts /* ESI */;
ta = newTemp(cb);
ts = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ESI, TempReg, ts);
uInstr2(cb, LOAD, sz, TempReg, ts, TempReg, ta);
uInstr2(cb, PUT, sz, TempReg, ta, ArchReg, R_EAX);
uInstr0(cb, CALLM_S, 0);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, ta);
uLiteral(cb, 0);
uInstr1(cb, PUSH, 4, TempReg, ta);
uInstr1(cb, CALLM, 0, Lit16, VGOFF_(helper_get_dirflag));
uFlagsRWU(cb, FlagD, FlagsEmpty, FlagsEmpty);
uInstr1(cb, POP, 4, TempReg, ta);
uInstr0(cb, CALLM_E, 0);
if (sz == 4 || sz == 2) {
uInstr2(cb, SHL, 4, Literal, 0, TempReg, ta);
uLiteral(cb, sz/2);
}
uInstr2(cb, ADD, 4, TempReg, ta, TempReg, ts);
uInstr2(cb, PUT, 4, TempReg, ts, ArchReg, R_ESI);
}
/* Template for REPNE SCAS<sz>, _not_ preceded by a REP prefix. */
static
void codegen_SCAS ( UCodeBlock* cb, Int sz )
{
Int ta /* EAX */, td /* EDI */, tv;
ta = newTemp(cb);
tv = newTemp(cb);
td = newTemp(cb);
uInstr2(cb, GET, sz, ArchReg, R_EAX, TempReg, ta);
uInstr2(cb, GET, 4, ArchReg, R_EDI, TempReg, td);
uInstr2(cb, LOAD, sz, TempReg, td, TempReg, tv);
/* next uinstr kills ta, but that's ok -- don't need it again */
uInstr2(cb, SUB, sz, TempReg, tv, TempReg, ta);
setFlagsFromUOpcode(cb, SUB);
uInstr0(cb, CALLM_S, 0);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, tv);
uLiteral(cb, 0);
uInstr1(cb, PUSH, 4, TempReg, tv);
uInstr1(cb, CALLM, 0, Lit16, VGOFF_(helper_get_dirflag));
uFlagsRWU(cb, FlagD, FlagsEmpty, FlagsEmpty);
uInstr1(cb, POP, 4, TempReg, tv);
uInstr0(cb, CALLM_E, 0);
if (sz == 4 || sz == 2) {
uInstr2(cb, SHL, 4, Literal, 0, TempReg, tv);
uLiteral(cb, sz/2);
}
uInstr2(cb, ADD, 4, TempReg, tv, TempReg, td);
uInstr2(cb, PUT, 4, TempReg, td, ArchReg, R_EDI);
}
/* (I)MUL E, G. Supplied eip points to the modR/M byte. */
static
Addr dis_mul_E_G ( UCodeBlock* cb,
Int size,
Addr eip0,
Bool signed_multiply )
{
Int ta, tg, te, helper;
UChar dis_buf[50];
UChar rm = getUChar(eip0);
ta = INVALID_TEMPREG;
te = newTemp(cb);
tg = newTemp(cb);
switch (size) {
case 4: helper = signed_multiply ? VGOFF_(helper_imul_32_64)
: VGOFF_(helper_mul_32_64);
break;
case 2: helper = signed_multiply ? VGOFF_(helper_imul_16_32)
: VGOFF_(helper_mul_16_32);
break;
case 1: helper = signed_multiply ? VGOFF_(helper_imul_8_16)
: VGOFF_(helper_mul_8_16);
break;
default: VG_(panic)("dis_mul_E_G");
}
uInstr0(cb, CALLM_S, 0);
if (epartIsReg(rm)) {
uInstr2(cb, GET, size, ArchReg, eregOfRM(rm), TempReg, te);
uInstr2(cb, GET, size, ArchReg, gregOfRM(rm), TempReg, tg);
uInstr1(cb, PUSH, size, TempReg, te);
uInstr1(cb, PUSH, size, TempReg, tg);
uInstr1(cb, CALLM, 0, Lit16, helper);
uFlagsRWU(cb, FlagsEmpty, FlagsOC, FlagsSZAP);
uInstr1(cb, CLEAR, 0, Lit16, 4);
uInstr1(cb, POP, size, TempReg, tg);
uInstr2(cb, PUT, size, TempReg, tg, ArchReg, gregOfRM(rm));
uInstr0(cb, CALLM_E, 0);
if (dis) VG_(printf)("%smul%c %s, %s\n",
signed_multiply ? "i" : "",
nameISize(size),
nameIReg(size,eregOfRM(rm)),
nameIReg(size,gregOfRM(rm)));
return 1+eip0;
} else {
UInt pair = disAMode ( cb, eip0, dis?dis_buf:NULL);
ta = LOW24(pair);
uInstr2(cb, LOAD, size, TempReg, ta, TempReg, te);
uInstr2(cb, GET, size, ArchReg, gregOfRM(rm), TempReg, tg);
uInstr1(cb, PUSH, size, TempReg, te);
uInstr1(cb, PUSH, size, TempReg, tg);
uInstr1(cb, CALLM, 0, Lit16, helper);
uFlagsRWU(cb, FlagsEmpty, FlagsOC, FlagsSZAP);
uInstr1(cb, CLEAR, 0, Lit16, 4);
uInstr1(cb, POP, size, TempReg, tg);
uInstr2(cb, PUT, size, TempReg, tg, ArchReg, gregOfRM(rm));
uInstr0(cb, CALLM_E, 0);
if (dis) VG_(printf)("%smul%c %s, %s\n",
signed_multiply ? "i" : "",
nameISize(size),
dis_buf,nameIReg(size,gregOfRM(rm)));
return HI8(pair)+eip0;
}
}
/* IMUL I * E -> G. Supplied eip points to the modR/M byte. */
static
Addr dis_imul_I_E_G ( UCodeBlock* cb,
Int size,
Addr eip,
Int litsize )
{
Int ta, te, tl, helper, d32;
UChar dis_buf[50];
UChar rm = getUChar(eip);
ta = INVALID_TEMPREG;
te = newTemp(cb);
tl = newTemp(cb);
switch (size) {
case 4: helper = VGOFF_(helper_imul_32_64); break;
case 2: helper = VGOFF_(helper_imul_16_32); break;
case 1: helper = VGOFF_(helper_imul_8_16); break;
default: VG_(panic)("dis_imul_I_E_G");
}
uInstr0(cb, CALLM_S, 0);
if (epartIsReg(rm)) {
uInstr2(cb, GET, size, ArchReg, eregOfRM(rm), TempReg, te);
uInstr1(cb, PUSH, size, TempReg, te);
eip++;
} else {
UInt pair = disAMode ( cb, eip, dis?dis_buf:NULL);
ta = LOW24(pair);
uInstr2(cb, LOAD, size, TempReg, ta, TempReg, te);
uInstr1(cb, PUSH, size, TempReg, te);
eip += HI8(pair);
}
d32 = getSDisp(litsize,eip);
eip += litsize;
uInstr2(cb, MOV, size, Literal, 0, TempReg, tl);
uLiteral(cb, d32);
uInstr1(cb, PUSH, size, TempReg, tl);
uInstr1(cb, CALLM, 0, Lit16, helper);
uFlagsRWU(cb, FlagsEmpty, FlagsOC, FlagsSZAP);
uInstr1(cb, CLEAR, 0, Lit16, 4);
uInstr1(cb, POP, size, TempReg, te);
uInstr2(cb, PUT, size, TempReg, te, ArchReg, gregOfRM(rm));
uInstr0(cb, CALLM_E, 0);
if (dis) {
if (epartIsReg(rm)) {
VG_(printf)("imul %d, %s, %s\n", d32, nameIReg(size,eregOfRM(rm)),
nameIReg(size,gregOfRM(rm)));
} else {
VG_(printf)("imul %d, %s, %s\n", d32, dis_buf,
nameIReg(size,gregOfRM(rm)));
}
}
return eip;
}
/* Handle FPU insns which read/write memory. On entry, eip points to
the second byte of the insn (the one following D8 .. DF). */
static
Addr dis_fpu_mem ( UCodeBlock* cb, Int size, Bool is_write,
Addr eip, UChar first_byte )
{
Int ta;
UInt pair;
UChar dis_buf[50];
UChar second_byte = getUChar(eip);
vg_assert(second_byte < 0xC0);
second_byte &= 0x38;
pair = disAMode ( cb, eip, dis?dis_buf:NULL );
ta = LOW24(pair);
eip += HI8(pair);
uInstr2(cb, is_write ? FPU_W : FPU_R, size,
Lit16,
(((UShort)first_byte) << 8) | ((UShort)second_byte),
TempReg, ta);
if (is_write) SMC_IF_ALL(cb);
if (dis) {
if (is_write)
VG_(printf)("fpu_w_%d 0x%x:0x%x, %s\n",
size, (UInt)first_byte,
(UInt)second_byte, dis_buf );
else
VG_(printf)("fpu_r_%d %s, 0x%x:0x%x\n",
size, dis_buf,
(UInt)first_byte,
(UInt)second_byte );
}
return eip;
}
/* Handle FPU insns which don't reference memory. On entry, eip points to
the second byte of the insn (the one following D8 .. DF). */
static
Addr dis_fpu_no_mem ( UCodeBlock* cb, Addr eip, UChar first_byte )
{
Bool sets_ZCP = False;
Bool uses_ZCP = False;
UChar second_byte = getUChar(eip); eip++;
vg_assert(second_byte >= 0xC0);
/* Does the insn write any integer condition codes (%EIP) ? */
if (first_byte == 0xDB && second_byte >= 0xF0 && second_byte <= 0xF7) {
/* FCOMI */
sets_ZCP = True;
} else
if (first_byte == 0xDF && second_byte >= 0xF0 && second_byte <= 0xF7) {
/* FCOMIP */
sets_ZCP = True;
} else
if (first_byte == 0xDB && second_byte >= 0xE8 && second_byte <= 0xEF) {
/* FUCOMI */
sets_ZCP = True;
} else
if (first_byte == 0xDF && second_byte >= 0xE8 && second_byte <= 0xEF) {
/* FUCOMIP */
sets_ZCP = True;
}
/* Dually, does the insn read any integer condition codes (%EIP) ? */
if (first_byte == 0xDA && second_byte >= 0xC0 && second_byte <= 0xDF) {
/* FCMOVB %st(n), %st(0)
FCMOVE %st(n), %st(0)
FCMOVBE %st(n), %st(0)
FCMOVU %st(n), %st(0)
*/
uses_ZCP = True;
} else
if (first_byte == 0xDB && second_byte >= 0xC0 && second_byte <= 0xDF) {
/* FCMOVNB %st(n), %st(0)
FCMOVNE %st(n), %st(0)
FCMOVNBE %st(n), %st(0)
FCMOVNU %st(n), %st(0)
*/
uses_ZCP = True;
}
uInstr1(cb, FPU, 0,
Lit16,
(((UShort)first_byte) << 8) | ((UShort)second_byte)
);
if (uses_ZCP) {
/* VG_(printf)("!!! --- FPU insn which reads %EFLAGS\n"); */
uFlagsRWU(cb, FlagsZCP, FlagsEmpty, FlagsEmpty);
vg_assert(!sets_ZCP);
}
if (sets_ZCP) {
/* VG_(printf)("!!! --- FPU insn which writes %EFLAGS\n"); */
uFlagsRWU(cb, FlagsEmpty, FlagsZCP, FlagsEmpty);
vg_assert(!uses_ZCP);
}
if (dis) VG_(printf)("fpu 0x%x:0x%x%s%s\n",
(UInt)first_byte, (UInt)second_byte,
uses_ZCP ? " -rZCP" : "",
sets_ZCP ? " -wZCP" : "" );
return eip;
}
/* Top-level handler for all FPU insns. On entry, eip points to the
second byte of the insn. */
static
Addr dis_fpu ( UCodeBlock* cb, UChar first_byte, Addr eip )
{
const Bool rd = False;
const Bool wr = True;
UChar second_byte = getUChar(eip);
/* Handle FSTSW %ax specially. */
if (first_byte == 0xDF && second_byte == 0xE0) {
Int t1 = newTemp(cb);
uInstr0(cb, CALLM_S, 0);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, t1);
uLiteral(cb, 0);
uInstr1(cb, PUSH, 4, TempReg, t1);
uInstr1(cb, CALLM, 0, Lit16, VGOFF_(helper_fstsw_AX) );
uFlagsRWU(cb, FlagsEmpty, FlagsEmpty, FlagsEmpty);
uInstr1(cb, POP, 2, TempReg, t1);
uInstr2(cb, PUT, 2, TempReg, t1, ArchReg, R_EAX);
uInstr0(cb, CALLM_E, 0);
if (dis) VG_(printf)("fstsw %%ax\n");
eip++;
return eip;
}
/* Handle all non-memory FPU ops simply. */
if (second_byte >= 0xC0)
return dis_fpu_no_mem ( cb, eip, first_byte );
/* The insn references memory; need to determine
whether it reads or writes, and at what size. */
switch (first_byte) {
case 0xD8:
switch ((second_byte >> 3) & 7) {
case 0: /* FADDs */
case 1: /* FMULs */
case 2: /* FCOMs */
case 3: /* FCOMPs */
case 4: /* FSUBs */
case 5: /* FSUBRs */
case 6: /* FDIVs */
case 7: /* FDIVRs */
return dis_fpu_mem(cb, 4, rd, eip, first_byte);
default:
goto unhandled;
}
break;
case 0xD9:
switch ((second_byte >> 3) & 7) {
case 0: /* FLDs */
return dis_fpu_mem(cb, 4, rd, eip, first_byte);
case 2: /* FSTs */
case 3: /* FSTPs */
return dis_fpu_mem(cb, 4, wr, eip, first_byte);
case 5: /* FLDCW */
return dis_fpu_mem(cb, 2, rd, eip, first_byte);
case 7: /* FSTCW */
/* HACK! FSTCW actually writes 2 bytes, not 4. glibc
gets lots of moaning in __floor() if we do the right
thing here. */
/* Later ... hack disabled .. we do do the Right Thing. */
return dis_fpu_mem(cb, /*4*/ 2, wr, eip, first_byte);
default:
goto unhandled;
}
break;
case 0xDA:
switch ((second_byte >> 3) & 7) {
case 0: /* FIADD */
case 1: /* FIMUL */
case 2: /* FICOM */
case 3: /* FICOMP */
case 4: /* FISUB */
case 5: /* FISUBR */
case 6: /* FIDIV */
case 7: /* FIDIVR */
return dis_fpu_mem(cb, 4, rd, eip, first_byte);
default:
goto unhandled;
}
break;
case 0xDB:
switch ((second_byte >> 3) & 7) {
case 0: /* FILD dword-integer */
return dis_fpu_mem(cb, 4, rd, eip, first_byte);
case 2: /* FIST dword-integer */
return dis_fpu_mem(cb, 4, wr, eip, first_byte);
case 3: /* FISTPl */
return dis_fpu_mem(cb, 4, wr, eip, first_byte);
case 5: /* FLD extended-real */
return dis_fpu_mem(cb, 10, rd, eip, first_byte);
case 7: /* FSTP extended-real */
return dis_fpu_mem(cb, 10, wr, eip, first_byte);
default:
goto unhandled;
}
break;
case 0xDC:
switch ((second_byte >> 3) & 7) {
case 0: /* FADD double-real */
case 1: /* FMUL double-real */
case 2: /* FCOM double-real */
case 3: /* FCOMP double-real */
case 4: /* FSUB double-real */
case 5: /* FSUBR double-real */
case 6: /* FDIV double-real */
case 7: /* FDIVR double-real */
return dis_fpu_mem(cb, 8, rd, eip, first_byte);
default:
goto unhandled;
}
break;
case 0xDD:
switch ((second_byte >> 3) & 7) {
case 0: /* FLD double-real */
return dis_fpu_mem(cb, 8, rd, eip, first_byte);
case 2: /* FST double-real */
case 3: /* FSTP double-real */
return dis_fpu_mem(cb, 8, wr, eip, first_byte);
default:
goto unhandled;
}
break;
case 0xDF:
switch ((second_byte >> 3) & 7) {
case 0: /* FILD word-integer */
return dis_fpu_mem(cb, 2, rd, eip, first_byte);
case 2: /* FIST word-integer */
return dis_fpu_mem(cb, 2, wr, eip, first_byte);
case 3: /* FISTP word-integer */
return dis_fpu_mem(cb, 2, wr, eip, first_byte);
case 5: /* FILD qword-integer */
return dis_fpu_mem(cb, 8, rd, eip, first_byte);
case 7: /* FISTP qword-integer */
return dis_fpu_mem(cb, 8, wr, eip, first_byte);
default:
goto unhandled;
}
break;
default: goto unhandled;
}
unhandled:
VG_(printf)("dis_fpu: unhandled memory case 0x%2x:0x%2x(%d)\n",
(UInt)first_byte, (UInt)second_byte,
(UInt)((second_byte >> 3) & 7) );
VG_(panic)("dis_fpu: unhandled opcodes");
}
/* Double length left shifts. Apparently only required in v-size (no
b- variant). */
static
Addr dis_SHLRD_Gv_Ev ( UCodeBlock* cb, Addr eip, UChar modrm,
Int sz,
Tag amt_tag, UInt amt_val,
Bool left_shift )
{
/* amt_tag and amt_val denote either ArchReg(%CL) or a Literal.
And eip on entry points at the modrm byte. */
Int t, t1, t2, ta, helper;
UInt pair;
UChar dis_buf[50];
vg_assert(sz == 2 || sz == 4);
helper = left_shift
? (sz==4 ? VGOFF_(helper_shldl)
: VGOFF_(helper_shldw))
: (sz==4 ? VGOFF_(helper_shrdl)
: VGOFF_(helper_shrdw));
/* Get the amount to be shifted by onto the stack. */
t = newTemp(cb);
t1 = newTemp(cb);
t2 = newTemp(cb);
if (amt_tag == ArchReg) {
vg_assert(amt_val == R_CL);
uInstr2(cb, GET, 1, ArchReg, amt_val, TempReg, t);
} else {
uInstr2(cb, MOV, 1, Literal, 0, TempReg, t);
uLiteral(cb, amt_val);
}
uInstr0(cb, CALLM_S, 0);
uInstr1(cb, PUSH, 1, TempReg, t);
/* The E-part is the destination; this is shifted. The G-part
supplies bits to be shifted into the E-part, but is not
changed. */
uInstr2(cb, GET, sz, ArchReg, gregOfRM(modrm), TempReg, t1);
uInstr1(cb, PUSH, sz, TempReg, t1);
if (epartIsReg(modrm)) {
eip++;
uInstr2(cb, GET, sz, ArchReg, eregOfRM(modrm), TempReg, t2);
uInstr1(cb, PUSH, sz, TempReg, t2);
uInstr1(cb, CALLM, 0, Lit16, helper);
uFlagsRWU(cb, FlagsEmpty, FlagsOSZACP, FlagsEmpty);
uInstr1(cb, POP, sz, TempReg, t);
uInstr2(cb, PUT, sz, TempReg, t, ArchReg, eregOfRM(modrm));
if (dis)
VG_(printf)("shld%c %%cl, %s, %s\n",
nameISize(sz), nameIReg(sz, gregOfRM(modrm)),
nameIReg(sz, eregOfRM(modrm)));
} else {
pair = disAMode ( cb, eip, dis?dis_buf:NULL );
ta = LOW24(pair);
eip += HI8(pair);
uInstr2(cb, LOAD, sz, TempReg, ta, TempReg, t2);
uInstr1(cb, PUSH, sz, TempReg, t2);
uInstr1(cb, CALLM, 0, Lit16, helper);
uFlagsRWU(cb, FlagsEmpty, FlagsOSZACP, FlagsEmpty);
uInstr1(cb, POP, sz, TempReg, t);
uInstr2(cb, STORE, sz, TempReg, t, TempReg, ta);
SMC_IF_ALL(cb);
if (dis)
VG_(printf)("shld%c %%cl, %s, %s\n",
nameISize(sz), nameIReg(sz, gregOfRM(modrm)),
dis_buf);
}
if (amt_tag == Literal) eip++;
uInstr1(cb, CLEAR, 0, Lit16, 8);
uInstr0(cb, CALLM_E, 0);
return eip;
}
/* Handle BT/BTS/BTR/BTC Gv, Ev. Apparently b-size is not
required. */
typedef enum { BtOpNone, BtOpSet, BtOpReset, BtOpComp } BtOp;
static Char* nameBtOp ( BtOp op )
{
switch (op) {
case BtOpNone: return "";
case BtOpSet: return "s";
case BtOpReset: return "r";
case BtOpComp: return "c";
default: VG_(panic)("nameBtOp");
}
}
static
Addr dis_bt_G_E ( UCodeBlock* cb, Int sz, Addr eip, BtOp op )
{
UInt pair;
UChar dis_buf[50];
UChar modrm;
Int t_addr, t_bitno, t_mask, t_fetched, t_esp, temp, lit;
/* 2 and 4 are actually possible. */
vg_assert(sz == 2 || sz == 4);
/* We only handle 4. */
vg_assert(sz == 4);
t_addr = t_bitno = t_mask
= t_fetched = t_esp = temp = INVALID_TEMPREG;
t_fetched = newTemp(cb);
t_bitno = newTemp(cb);
temp = newTemp(cb);
lit = newTemp(cb);
modrm = getUChar(eip);
uInstr2(cb, GET, sz, ArchReg, gregOfRM(modrm), TempReg, t_bitno);
if (epartIsReg(modrm)) {
eip++;
/* Get it onto the client's stack. */
t_esp = newTemp(cb);
t_addr = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ESP, TempReg, t_esp);
uInstr2(cb, SUB, sz, Literal, 0, TempReg, t_esp);
uLiteral(cb, sz);
uInstr2(cb, PUT, 4, TempReg, t_esp, ArchReg, R_ESP);
uInstr2(cb, GET, sz, ArchReg, eregOfRM(modrm), TempReg, temp);
uInstr2(cb, STORE, sz, TempReg, temp, TempReg, t_esp);
/* Make ta point at it. */
uInstr2(cb, MOV, 4, TempReg, t_esp, TempReg, t_addr);
/* Mask out upper bits of the shift amount, since we're doing a
reg. */
uInstr2(cb, MOV, 4, Literal, 0, TempReg, lit);
uLiteral(cb, sz == 4 ? 31 : 15);
uInstr2(cb, AND, 4, TempReg, lit, TempReg, t_bitno);
} else {
pair = disAMode ( cb, eip, dis?dis_buf:NULL );
t_addr = LOW24(pair);
eip += HI8(pair);
}
/* At this point: ta points to the address being operated on. If
it was a reg, we will have pushed it onto the client's stack.
t_bitno is the bit number, suitable masked in the case of a reg. */
/* Now the main sequence. */
uInstr2(cb, MOV, 4, TempReg, t_bitno, TempReg, temp);
uInstr2(cb, SAR, 4, Literal, 0, TempReg, temp);
uLiteral(cb, 3);
uInstr2(cb, ADD, 4, TempReg, temp, TempReg, t_addr);
/* ta now holds effective address */
uInstr2(cb, MOV, 4, Literal, 0, TempReg, lit);
uLiteral(cb, 7);
uInstr2(cb, AND, 4, TempReg, lit, TempReg, t_bitno);
/* bitno contains offset of bit within byte */
if (op != BtOpNone) {
t_mask = newTemp(cb);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, t_mask);
uLiteral(cb, 1);
uInstr2(cb, SHL, 4, TempReg, t_bitno, TempReg, t_mask);
}
/* mask is now a suitable byte mask */
uInstr2(cb, LOAD, 1, TempReg, t_addr, TempReg, t_fetched);
if (op != BtOpNone) {
uInstr2(cb, MOV, 4, TempReg, t_fetched, TempReg, temp);
switch (op) {
case BtOpSet:
uInstr2(cb, OR, 4, TempReg, t_mask, TempReg, temp);
break;
case BtOpComp:
uInstr2(cb, XOR, 4, TempReg, t_mask, TempReg, temp);
break;
case BtOpReset:
uInstr1(cb, NOT, 4, TempReg, t_mask);
uInstr2(cb, AND, 4, TempReg, t_mask, TempReg, temp);
break;
default:
VG_(panic)("dis_bt_G_E");
}
uInstr2(cb, STORE, 1, TempReg, temp, TempReg, t_addr);
}
/* Side effect done; now get selected bit into Carry flag */
uInstr2(cb, SHR, 4, TempReg, t_bitno, TempReg, t_fetched);
/* at bit 0 of fetched */
uInstr2(cb, MOV, 4, Literal, 0, TempReg, lit);
uLiteral(cb, 1);
uInstr2(cb, AND, 4, TempReg, lit, TempReg, t_fetched);
/* fetched is now 1 or 0 */
/* NEG is a handy way to convert zero/nonzero into the carry
flag. */
uInstr1(cb, NEG, 4, TempReg, t_fetched);
setFlagsFromUOpcode(cb, NEG);
/* fetched is now in carry flag */
/* Move reg operand from stack back to reg */
if (epartIsReg(modrm)) {
/* t_esp still points at it. */
uInstr2(cb, LOAD, sz, TempReg, t_esp, TempReg, temp);
uInstr2(cb, PUT, sz, TempReg, temp, ArchReg, eregOfRM(modrm));
uInstr2(cb, ADD, sz, Literal, 0, TempReg, t_esp);
uLiteral(cb, sz);
uInstr2(cb, PUT, 4, TempReg, t_esp, ArchReg, R_ESP);
}
if (epartIsReg(modrm)) {
if (dis)
VG_(printf)("bt%s%c %s, %s\n",
nameBtOp(op),
nameISize(sz), nameIReg(sz, gregOfRM(modrm)),
nameIReg(sz, eregOfRM(modrm)));
} else {
if (dis)
VG_(printf)("bt%s%c %s, %s\n",
nameBtOp(op),
nameISize(sz), nameIReg(sz, gregOfRM(modrm)),
dis_buf);
}
return eip;
}
/* Handle BSF/BSR. Only v-size seems necessary. */
static
Addr dis_bs_E_G ( UCodeBlock* cb, Int sz, Addr eip, Bool fwds )
{
Int t, t1, ta, helper;
UInt pair;
UChar dis_buf[50];
UChar modrm;
vg_assert(sz == 2 || sz == 4);
vg_assert(sz==4);
helper = fwds ? VGOFF_(helper_bsf) : VGOFF_(helper_bsr);
modrm = getUChar(eip);
t1 = newTemp(cb);
t = newTemp(cb);
uInstr0(cb, CALLM_S, 0);
uInstr2(cb, GET, sz, ArchReg, gregOfRM(modrm), TempReg, t1);
uInstr1(cb, PUSH, sz, TempReg, t1);
if (epartIsReg(modrm)) {
eip++;
uInstr2(cb, GET, sz, ArchReg, eregOfRM(modrm), TempReg, t);
if (dis)
VG_(printf)("bs%c%c %s, %s\n",
fwds ? 'f' : 'r',
nameISize(sz), nameIReg(sz, eregOfRM(modrm)),
nameIReg(sz, gregOfRM(modrm)));
} else {
pair = disAMode ( cb, eip, dis?dis_buf:NULL );
ta = LOW24(pair);
eip += HI8(pair);
uInstr2(cb, LOAD, sz, TempReg, ta, TempReg, t);
if (dis)
VG_(printf)("bs%c%c %s, %s\n",
fwds ? 'f' : 'r',
nameISize(sz), dis_buf,
nameIReg(sz, gregOfRM(modrm)));
}
uInstr1(cb, PUSH, sz, TempReg, t);
uInstr1(cb, CALLM, 0, Lit16, helper);
uFlagsRWU(cb, FlagsEmpty, FlagZ, FlagsOSACP);
uInstr1(cb, POP, sz, TempReg, t);
uInstr1(cb, POP, sz, TempReg, t);
uInstr2(cb, PUT, sz, TempReg, t, ArchReg, gregOfRM(modrm));
uInstr0(cb, CALLM_E, 0);
return eip;
}
static
void codegen_xchg_eAX_Reg ( UCodeBlock* cb, Int sz, Int reg )
{
Int t1, t2;
vg_assert(sz == 2 || sz == 4);
t1 = newTemp(cb);
t2 = newTemp(cb);
uInstr2(cb, GET, sz, ArchReg, R_EAX, TempReg, t1);
uInstr2(cb, GET, sz, ArchReg, reg, TempReg, t2);
uInstr2(cb, PUT, sz, TempReg, t2, ArchReg, R_EAX);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, reg);
if (dis)
VG_(printf)("xchg%c %s, %s\n", nameISize(sz),
nameIReg(sz, R_EAX), nameIReg(sz, reg));
}
static
void codegen_SAHF ( UCodeBlock* cb )
{
Int t = newTemp(cb);
Int t2 = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_EAX, TempReg, t);
/* Mask out parts of t not corresponding to %AH. This stops the
instrumenter complaining if they are undefined. Otherwise, the
instrumenter would check all 32 bits of t at the PUSH, which
could be the cause of incorrect warnings. Discovered by Daniel
Veillard <veillard@redhat.com>.
*/
uInstr2(cb, MOV, 4, Literal, 0, TempReg, t2);
uLiteral(cb, 0x0000FF00);
uInstr2(cb, AND, 4, TempReg, t2, TempReg, t);
/* We deliberately don't set the condition codes here, since this
AND is purely internal to Valgrind and nothing to do with the
client's state. */
uInstr0(cb, CALLM_S, 0);
uInstr1(cb, PUSH, 4, TempReg, t);
uInstr1(cb, CALLM, 0, Lit16, VGOFF_(helper_SAHF));
uFlagsRWU(cb, FlagsEmpty, FlagsSZACP, FlagsEmpty);
uInstr1(cb, CLEAR, 0, Lit16, 4);
uInstr0(cb, CALLM_E, 0);
}
static
Addr dis_cmpxchg_G_E ( UCodeBlock* cb,
Int size,
Addr eip0 )
{
Int ta, junk, dest, src, acc;
UChar dis_buf[50];
UChar rm;
rm = getUChar(eip0);
acc = newTemp(cb);
src = newTemp(cb);
dest = newTemp(cb);
junk = newTemp(cb);
/* Only needed to get gcc's dataflow analyser off my back. */
ta = INVALID_TEMPREG;
if (epartIsReg(rm)) {
uInstr2(cb, GET, size, ArchReg, eregOfRM(rm), TempReg, dest);
eip0++;
if (dis) VG_(printf)("cmpxchg%c %s,%s\n",
nameISize(size),
nameIReg(size,gregOfRM(rm)),
nameIReg(size,eregOfRM(rm)) );
nameIReg(size,eregOfRM(rm));
} else {
UInt pair = disAMode ( cb, eip0, dis?dis_buf:NULL );
ta = LOW24(pair);
uInstr2(cb, LOAD, size, TempReg, ta, TempReg, dest);
eip0 += HI8(pair);
if (dis) VG_(printf)("cmpxchg%c %s,%s\n", nameISize(size),
nameIReg(size,gregOfRM(rm)), dis_buf);
}
uInstr2(cb, GET, size, ArchReg, gregOfRM(rm), TempReg, src);
uInstr2(cb, GET, size, ArchReg, R_EAX, TempReg, acc);
uInstr2(cb, MOV, size, TempReg, acc, TempReg, junk);
uInstr2(cb, SUB, size, TempReg, dest, TempReg, junk);
setFlagsFromUOpcode(cb, SUB);
uInstr2(cb, CMOV, 4, TempReg, src, TempReg, dest);
uCond(cb, CondZ);
uFlagsRWU(cb, FlagsOSZACP, FlagsEmpty, FlagsEmpty);
uInstr2(cb, CMOV, 4, TempReg, dest, TempReg, acc);
uCond(cb, CondNZ);
uFlagsRWU(cb, FlagsOSZACP, FlagsEmpty, FlagsEmpty);
uInstr2(cb, PUT, size, TempReg, acc, ArchReg, R_EAX);
if (epartIsReg(rm)) {
uInstr2(cb, PUT, size, TempReg, dest, ArchReg, eregOfRM(rm));
} else {
uInstr2(cb, STORE, size, TempReg, dest, TempReg, ta);
}
return eip0;
}
/* Handle conditional move instructions of the form
cmovcc E(reg-or-mem), G(reg)
E(src) is reg-or-mem
G(dst) is reg.
If E is reg, --> GET %E, tmps
GET %G, tmpd
CMOVcc tmps, tmpd
PUT tmpd, %G
If E is mem --> (getAddr E) -> tmpa
LD (tmpa), tmps
GET %G, tmpd
CMOVcc tmps, tmpd
PUT tmpd, %G
*/
static
Addr dis_cmov_E_G ( UCodeBlock* cb,
Int size,
Condcode cond,
Addr eip0 )
{
UChar rm = getUChar(eip0);
UChar dis_buf[50];
Int tmps = newTemp(cb);
Int tmpd = newTemp(cb);
if (epartIsReg(rm)) {
uInstr2(cb, GET, size, ArchReg, eregOfRM(rm), TempReg, tmps);
uInstr2(cb, GET, size, ArchReg, gregOfRM(rm), TempReg, tmpd);
uInstr2(cb, CMOV, 4, TempReg, tmps, TempReg, tmpd);
uCond(cb, cond);
uFlagsRWU(cb, FlagsOSZACP, FlagsEmpty, FlagsEmpty);
uInstr2(cb, PUT, size, TempReg, tmpd, ArchReg, gregOfRM(rm));
if (dis) VG_(printf)("cmov%c%s %s,%s\n",
nameISize(size),
VG_(nameCondcode)(cond),
nameIReg(size,eregOfRM(rm)),
nameIReg(size,gregOfRM(rm)));
return 1+eip0;
}
/* E refers to memory */
{
UInt pair = disAMode ( cb, eip0, dis?dis_buf:NULL);
Int tmpa = LOW24(pair);
uInstr2(cb, LOAD, size, TempReg, tmpa, TempReg, tmps);
uInstr2(cb, GET, size, ArchReg, gregOfRM(rm), TempReg, tmpd);
uInstr2(cb, CMOV, 4, TempReg, tmps, TempReg, tmpd);
uCond(cb, cond);
uFlagsRWU(cb, FlagsOSZACP, FlagsEmpty, FlagsEmpty);
uInstr2(cb, PUT, size, TempReg, tmpd, ArchReg, gregOfRM(rm));
if (dis) VG_(printf)("cmov%c%s %s,%s\n",
nameISize(size),
VG_(nameCondcode)(cond),
dis_buf,
nameIReg(size,gregOfRM(rm)));
return HI8(pair)+eip0;
}
}
static
Addr dis_xadd_G_E ( UCodeBlock* cb,
Int sz,
Addr eip0 )
{
UChar rm = getUChar(eip0);
UChar dis_buf[50];
Int tmpd = newTemp(cb);
Int tmpt = newTemp(cb);
if (epartIsReg(rm)) {
uInstr2(cb, GET, sz, ArchReg, eregOfRM(rm), TempReg, tmpd);
uInstr2(cb, GET, sz, ArchReg, gregOfRM(rm), TempReg, tmpt);
uInstr2(cb, ADD, sz, TempReg, tmpd, TempReg, tmpt);
setFlagsFromUOpcode(cb, ADD);
uInstr2(cb, PUT, sz, TempReg, tmpt, ArchReg, eregOfRM(rm));
uInstr2(cb, PUT, sz, TempReg, tmpd, ArchReg, gregOfRM(rm));
if (dis)
VG_(printf)("xadd%c %s, %s\n", nameISize(sz),
nameIReg(sz,gregOfRM(rm)),
nameIReg(sz,eregOfRM(rm)));
return 1+eip0;
} else {
UInt pair = disAMode ( cb, eip0, dis?dis_buf:NULL);
Int tmpa = LOW24(pair);
uInstr2(cb, LOAD, sz, TempReg, tmpa, TempReg, tmpd);
uInstr2(cb, GET, sz, ArchReg, gregOfRM(rm), TempReg, tmpt);
uInstr2(cb, ADD, sz, TempReg, tmpd, TempReg, tmpt);
setFlagsFromUOpcode(cb, ADD);
uInstr2(cb, STORE, sz, TempReg, tmpt, TempReg, tmpa);
SMC_IF_SOME(cb);
uInstr2(cb, PUT, sz, TempReg, tmpd, ArchReg, gregOfRM(rm));
if (dis)
VG_(printf)("xadd%c %s, %s\n", nameISize(sz),
nameIReg(sz,gregOfRM(rm)),
dis_buf);
return HI8(pair)+eip0;
}
}
/*------------------------------------------------------------*/
/*--- Disassembling entire basic blocks ---*/
/*------------------------------------------------------------*/
/* Disassemble a single instruction into ucode, returning the update
eip, and setting *isEnd to True if this is the last insn in a basic
block. Also do debug printing if (dis). */
static Addr disInstr ( UCodeBlock* cb, Addr eip, Bool* isEnd )
{
UChar opc, modrm, abyte;
UInt d32, pair;
Int t1, t2, t3, t4;
UChar dis_buf[50];
Int am_sz, d_sz;
Int sz = 4;
Int first_uinstr = cb->used;
*isEnd = False;
t1 = t2 = t3 = t4 = INVALID_TEMPREG;
if (dis) VG_(printf)("\t0x%x: ", eip);
/* Spot the client-request magic sequence. */
{
UChar* myeip = (UChar*)eip;
/* Spot this:
C1C01D roll $29, %eax
C1C003 roll $3, %eax
C1C81B rorl $27, %eax
C1C805 rorl $5, %eax
C1C00D roll $13, %eax
C1C013 roll $19, %eax
*/
if (myeip[ 0] == 0xC1 && myeip[ 1] == 0xC0 && myeip[ 2] == 0x1D &&
myeip[ 3] == 0xC1 && myeip[ 4] == 0xC0 && myeip[ 5] == 0x03 &&
myeip[ 6] == 0xC1 && myeip[ 7] == 0xC8 && myeip[ 8] == 0x1B &&
myeip[ 9] == 0xC1 && myeip[10] == 0xC8 && myeip[11] == 0x05 &&
myeip[12] == 0xC1 && myeip[13] == 0xC0 && myeip[14] == 0x0D &&
myeip[15] == 0xC1 && myeip[16] == 0xC0 && myeip[17] == 0x13
) {
eip += 18;
uInstr1(cb, JMP, 0, Literal, 0);
uLiteral(cb, eip);
uCond(cb, CondAlways);
LAST_UINSTR(cb).jmpkind = JmpClientReq;
*isEnd = True;
if (dis)
VG_(printf)("%%edx = client_request ( %%eax )\n");
return eip;
}
}
/* Skip a LOCK prefix. */
if (getUChar(eip) == 0xF0) {
/* VG_(printf)("LOCK LOCK LOCK LOCK LOCK \n"); */
eip++;
}
/* Crap out if we see a segment override prefix. */
if (getUChar(eip) == 0x65) {
VG_(message)(Vg_DebugMsg, "");
VG_(message)(Vg_DebugMsg, "Possible workaround for the following abort: do not use special");
VG_(message)(Vg_DebugMsg, "PII/PIII-specific pthreads library (possibly in /lib/i686/*.so).");
VG_(message)(Vg_DebugMsg, "You might be able to kludge around this by renaming /lib/i686 to");
VG_(message)(Vg_DebugMsg, "/lib/i686-HIDDEN. On RedHat 7.2 this causes ld.so to fall back");
VG_(message)(Vg_DebugMsg, "to using the less specialised versions in /lib instead, which");
VG_(message)(Vg_DebugMsg, "valgrind might be able to better deal with.");
VG_(message)(Vg_DebugMsg, "");
VG_(message)(Vg_DebugMsg, "WARNING. WARNING. WARNING. WARNING. WARNING. WARNING. WARNING.");
VG_(message)(Vg_DebugMsg, "WARNING: The suggested kludge may also render your system unbootable");
VG_(message)(Vg_DebugMsg, "WARNING: or otherwise totally screw it up. Only try this if you");
VG_(message)(Vg_DebugMsg, "WARNING: know what you are doing, and are prepared to take risks.");
VG_(message)(Vg_DebugMsg, "YOU HAVE BEEN WARNED. YOU HAVE BEEN WARNED. YOU HAVE BEEN WARNED.");
VG_(message)(Vg_DebugMsg, "");
VG_(message)(Vg_DebugMsg, "Another consideration is that this may well mean your application");
VG_(message)(Vg_DebugMsg, "uses threads, which valgrind doesn't currently support, so even if");
VG_(message)(Vg_DebugMsg, "you work around this problem, valgrind may abort later if it sees");
VG_(message)(Vg_DebugMsg, "a clone() system call.");
VG_(unimplemented)("x86 segment override (SEG=GS) prefix; see above for details");
}
/* Detect operand-size overrides. */
if (getUChar(eip) == 0x66) { sz = 2; eip++; };
opc = getUChar(eip); eip++;
switch (opc) {
/* ------------------------ Control flow --------------- */
case 0xC2: /* RET imm16 */
d32 = getUDisp16(eip); eip += 2;
goto do_Ret;
case 0xC3: /* RET */
d32 = 0;
goto do_Ret;
do_Ret:
t1 = newTemp(cb); t2 = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ESP, TempReg, t1);
uInstr2(cb, LOAD, 4, TempReg, t1, TempReg, t2);
uInstr2(cb, ADD, 4, Literal, 0, TempReg, t1);
uLiteral(cb, 4+d32);
uInstr2(cb, PUT, 4, TempReg, t1, ArchReg, R_ESP);
uInstr1(cb, JMP, 0, TempReg, t2);
uCond(cb, CondAlways);
LAST_UINSTR(cb).jmpkind = JmpRet;
*isEnd = True;
if (dis) {
if (d32 == 0) VG_(printf)("ret\n");
else VG_(printf)("ret %d\n", d32);
}
break;
case 0xE8: /* CALL J4 */
d32 = getUDisp32(eip); eip += 4;
d32 += eip; /* eip now holds return-to addr, d32 is call-to addr */
if (d32 == eip && getUChar(eip) >= 0x58
&& getUChar(eip) <= 0x5F) {
/* Specially treat the position-independent-code idiom
call X
X: popl %reg
as
movl %eip, %reg.
since this generates better code, but for no other reason. */
Int archReg = getUChar(eip) - 0x58;
/* VG_(printf)("-- fPIC thingy\n"); */
t1 = newTemp(cb);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, t1);
uLiteral(cb, eip);
uInstr2(cb, PUT, 4, TempReg, t1, ArchReg, archReg);
eip++; /* Step over the POP */
if (dis)
VG_(printf)("call 0x%x ; popl %s\n",d32,nameIReg(4,archReg));
} else {
/* The normal sequence for a call. */
t1 = newTemp(cb); t2 = newTemp(cb); t3 = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ESP, TempReg, t3);
uInstr2(cb, MOV, 4, TempReg, t3, TempReg, t1);
uInstr2(cb, SUB, 4, Literal, 0, TempReg, t1);
uLiteral(cb, 4);
uInstr2(cb, PUT, 4, TempReg, t1, ArchReg, R_ESP);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, t2);
uLiteral(cb, eip);
uInstr2(cb, STORE, 4, TempReg, t2, TempReg, t1);
SMC_IF_ALL(cb);
uInstr1(cb, JMP, 0, Literal, 0);
uLiteral(cb, d32);
uCond(cb, CondAlways);
LAST_UINSTR(cb).jmpkind = JmpCall;
*isEnd = True;
if (dis) VG_(printf)("call 0x%x\n",d32);
}
break;
case 0xC9: /* LEAVE */
t1 = newTemp(cb); t2 = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_EBP, TempReg, t1);
uInstr2(cb, PUT, 4, TempReg, t1, ArchReg, R_ESP);
uInstr2(cb, LOAD, 4, TempReg, t1, TempReg, t2);
uInstr2(cb, PUT, 4, TempReg, t2, ArchReg, R_EBP);
uInstr2(cb, ADD, 4, Literal, 0, TempReg, t1);
uLiteral(cb, 4);
uInstr2(cb, PUT, 4, TempReg, t1, ArchReg, R_ESP);
if (dis) VG_(printf)("leave");
break;
/* ---------------- Misc wierd-ass insns --------------- */
case 0x27: /* DAA */
case 0x2F: /* DAS */
t1 = newTemp(cb);
uInstr2(cb, GET, 1, ArchReg, R_AL, TempReg, t1);
/* Widen %AL to 32 bits, so it's all defined when we push it. */
uInstr1(cb, WIDEN, 4, TempReg, t1);
LAST_UINSTR(cb).extra4b = 1;
LAST_UINSTR(cb).signed_widen = False;
uInstr0(cb, CALLM_S, 0);
uInstr1(cb, PUSH, 4, TempReg, t1);
uInstr1(cb, CALLM, 0, Lit16,
opc == 0x27 ? VGOFF_(helper_DAA) : VGOFF_(helper_DAS) );
uFlagsRWU(cb, FlagsAC, FlagsOSZACP, FlagsEmpty);
uInstr1(cb, POP, 4, TempReg, t1);
uInstr0(cb, CALLM_E, 0);
uInstr2(cb, PUT, 1, TempReg, t1, ArchReg, R_AL);
if (dis) VG_(printf)(opc == 0x27 ? "daa\n" : "das\n");
break;
/* ------------------------ CWD/CDQ -------------------- */
case 0x98: /* CBW */
t1 = newTemp(cb);
if (sz == 4) {
uInstr2(cb, GET, 2, ArchReg, R_EAX, TempReg, t1);
uInstr1(cb, WIDEN, 4, TempReg, t1); /* 4 == dst size */
LAST_UINSTR(cb).extra4b = 2; /* the source size */
LAST_UINSTR(cb).signed_widen = True;
uInstr2(cb, PUT, 4, TempReg, t1, ArchReg, R_EAX);
if (dis) VG_(printf)("cwd\n");
} else {
vg_assert(sz == 2);
uInstr2(cb, GET, 1, ArchReg, R_EAX, TempReg, t1);
uInstr1(cb, WIDEN, 2, TempReg, t1); /* 2 == dst size */
LAST_UINSTR(cb).extra4b = 1; /* the source size */
LAST_UINSTR(cb).signed_widen = True;
uInstr2(cb, PUT, 2, TempReg, t1, ArchReg, R_EAX);
if (dis) VG_(printf)("cbw\n");
}
break;
case 0x99: /* CWD/CDQ */
t1 = newTemp(cb);
uInstr2(cb, GET, sz, ArchReg, R_EAX, TempReg, t1);
uInstr2(cb, SAR, sz, Literal, 0, TempReg, t1);
uLiteral(cb, sz == 2 ? 15 : 31);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, R_EDX);
if (dis) VG_(printf)(sz == 2 ? "cwdq\n" : "cdqq\n");
break;
/* ------------------------ FPU ops -------------------- */
case 0x9E: /* SAHF */
codegen_SAHF ( cb );
if (dis) VG_(printf)("sahf\n");
break;
case 0x9B: /* FWAIT */
/* ignore? */
if (dis) VG_(printf)("fwait\n");
break;
case 0xD8:
case 0xD9:
case 0xDA:
case 0xDB:
case 0xDC:
case 0xDD:
case 0xDE:
case 0xDF:
eip = dis_fpu ( cb, opc, eip );
break;
/* ------------------------ INC & DEC ------------------ */
case 0x40: /* INC eAX */
case 0x41: /* INC eCX */
case 0x42: /* INC eDX */
case 0x43: /* INC eBX */
case 0x45: /* INC eBP */
case 0x46: /* INC eSI */
case 0x47: /* INC eDI */
t1 = newTemp(cb);
uInstr2(cb, GET, sz, ArchReg, (UInt)(opc - 0x40),
TempReg, t1);
uInstr1(cb, INC, sz, TempReg, t1);
setFlagsFromUOpcode(cb, INC);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg,
(UInt)(opc - 0x40));
if (dis)
VG_(printf)("inc%c %s\n", nameISize(sz), nameIReg(sz,opc-0x40));
break;
case 0x48: /* DEC eAX */
case 0x49: /* DEC eCX */
case 0x4A: /* DEC eDX */
case 0x4B: /* DEC eBX */
case 0x4D: /* DEC eBP */
case 0x4E: /* DEC eSI */
case 0x4F: /* DEC eDI */
t1 = newTemp(cb);
uInstr2(cb, GET, sz, ArchReg, (UInt)(opc - 0x48),
TempReg, t1);
uInstr1(cb, DEC, sz, TempReg, t1);
setFlagsFromUOpcode(cb, DEC);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg,
(UInt)(opc - 0x48));
if (dis)
VG_(printf)("dec%c %s\n", nameISize(sz), nameIReg(sz,opc-0x48));
break;
/* ------------------------ INT ------------------------ */
case 0xCD: /* INT imm8 */
d32 = getUChar(eip); eip++;
if (d32 != 0x80) VG_(panic)("disInstr: INT but not 0x80 !");
/* It's important that all ArchRegs carry their up-to-date value
at this point. So we declare an end-of-block here, which
forces any TempRegs caching ArchRegs to be flushed. */
uInstr1(cb, JMP, 0, Literal, 0);
uLiteral(cb, eip);
uCond(cb, CondAlways);
LAST_UINSTR(cb).jmpkind = JmpSyscall;
*isEnd = True;
if (dis) VG_(printf)("int $0x80\n");
break;
/* ------------------------ Jcond, byte offset --------- */
case 0xEB: /* Jb (jump, byte offset) */
d32 = (eip+1) + getSDisp8(eip); eip++;
uInstr1(cb, JMP, 0, Literal, 0);
uLiteral(cb, d32);
uCond(cb, CondAlways);
*isEnd = True;
if (dis)
VG_(printf)("jmp-8 0x%x\n", d32);
break;
case 0xE9: /* Jv (jump, 16/32 offset) */
d32 = (eip+sz) + getSDisp(sz,eip); eip += sz;
uInstr1(cb, JMP, 0, Literal, 0);
uLiteral(cb, d32);
uCond(cb, CondAlways);
*isEnd = True;
if (dis)
VG_(printf)("jmp 0x%x\n", d32);
break;
case 0x70:
case 0x71:
case 0x72: /* JBb/JNAEb (jump below) */
case 0x73: /* JNBb/JAEb (jump not below) */
case 0x74: /* JZb/JEb (jump zero) */
case 0x75: /* JNZb/JNEb (jump not zero) */
case 0x76: /* JBEb/JNAb (jump below or equal) */
case 0x77: /* JNBEb/JAb (jump not below or equal) */
case 0x78: /* JSb (jump negative) */
case 0x79: /* JSb (jump not negative) */
case 0x7A: /* JP (jump parity even) */
case 0x7B: /* JNP/JPO (jump parity odd) */
case 0x7C: /* JLb/JNGEb (jump less) */
case 0x7D: /* JGEb/JNLb (jump greater or equal) */
case 0x7E: /* JLEb/JNGb (jump less or equal) */
case 0x7F: /* JGb/JNLEb (jump greater) */
d32 = (eip+1) + getSDisp8(eip); eip++;
uInstr1(cb, JMP, 0, Literal, 0);
uLiteral(cb, d32);
uCond(cb, (Condcode)(opc - 0x70));
uFlagsRWU(cb, FlagsOSZACP, FlagsEmpty, FlagsEmpty);
/* It's actually acceptable not to end this basic block at a
control transfer, reducing the number of jumps through
vg_dispatch, at the expense of possibly translating the insns
following this jump twice. This does give faster code, but
on the whole I don't think the effort is worth it. */
uInstr1(cb, JMP, 0, Literal, 0);
uLiteral(cb, eip);
uCond(cb, CondAlways);
*isEnd = True;
/* The above 3 lines would be removed if the bb was not to end
here. */
if (dis)
VG_(printf)("j%s-8 0x%x\n", VG_(nameCondcode)(opc - 0x70), d32);
break;
case 0xE3: /* JECXZ or perhaps JCXZ, depending on OSO ? Intel
manual says it depends on address size override,
which doesn't sound right to me. */
d32 = (eip+1) + getSDisp8(eip); eip++;
t1 = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ECX, TempReg, t1);
uInstr2(cb, JIFZ, 4, TempReg, t1, Literal, 0);
uLiteral(cb, d32);
if (dis)
VG_(printf)("j%sz 0x%x\n", nameIReg(sz, R_ECX), d32);
break;
case 0xE2: /* LOOP disp8 */
/* Again, the docs say this uses ECX/CX as a count depending on
the address size override, not the operand one. Since we
don't handle address size overrides, I guess that means
ECX. */
d32 = (eip+1) + getSDisp8(eip); eip++;
t1 = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ECX, TempReg, t1);
uInstr1(cb, DEC, 4, TempReg, t1);
uInstr2(cb, PUT, 4, TempReg, t1, ArchReg, R_ECX);
uInstr2(cb, JIFZ, 4, TempReg, t1, Literal, 0);
uLiteral(cb, eip);
uInstr1(cb, JMP, 0, Literal, 0);
uLiteral(cb, d32);
uCond(cb, CondAlways);
*isEnd = True;
if (dis)
VG_(printf)("loop 0x%x\n", d32);
break;
/* ------------------------ IMUL ----------------------- */
case 0x69: /* IMUL Iv, Ev, Gv */
eip = dis_imul_I_E_G ( cb, sz, eip, sz );
break;
case 0x6B: /* IMUL Ib, Ev, Gv */
eip = dis_imul_I_E_G ( cb, sz, eip, 1 );
break;
/* ------------------------ MOV ------------------------ */
case 0x88: /* MOV Gb,Eb */
eip = dis_mov_G_E(cb, 1, eip);
break;
case 0x89: /* MOV Gv,Ev */
eip = dis_mov_G_E(cb, sz, eip);
break;
case 0x8A: /* MOV Eb,Gb */
eip = dis_mov_E_G(cb, 1, eip);
break;
case 0x8B: /* MOV Ev,Gv */
eip = dis_mov_E_G(cb, sz, eip);
break;
case 0x8D: /* LEA M,Gv */
modrm = getUChar(eip);
if (epartIsReg(modrm))
VG_(panic)("LEA M,Gv: modRM refers to register");
pair = disAMode ( cb, eip, dis?dis_buf:NULL );
eip += HI8(pair);
t1 = LOW24(pair);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, gregOfRM(modrm));
if (dis)
VG_(printf)("lea%c %s, %s\n", nameISize(sz), dis_buf,
nameIReg(sz,gregOfRM(modrm)));
break;
case 0xA0: /* MOV Ob,AL */
sz = 1;
/* Fall through ... */
case 0xA1: /* MOV Ov,eAX */
d32 = getUDisp32(eip); eip += 4;
t1 = newTemp(cb); t2 = newTemp(cb);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, t2);
uLiteral(cb, d32);
uInstr2(cb, LOAD, sz, TempReg, t2, TempReg, t1);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, R_EAX);
if (dis) VG_(printf)("mov%c 0x%x,%s\n", nameISize(sz),
d32, nameIReg(sz,R_EAX));
break;
case 0xA2: /* MOV AL,Ob */
sz = 1;
/* Fall through ... */
case 0xA3: /* MOV eAX,Ov */
d32 = getUDisp32(eip); eip += 4;
t1 = newTemp(cb); t2 = newTemp(cb);
uInstr2(cb, GET, sz, ArchReg, R_EAX, TempReg, t1);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, t2);
uLiteral(cb, d32);
uInstr2(cb, STORE, sz, TempReg, t1, TempReg, t2);
SMC_IF_SOME(cb);
if (dis) VG_(printf)("mov%c %s,0x%x\n", nameISize(sz),
nameIReg(sz,R_EAX), d32);
break;
case 0xB0: /* MOV imm,AL */
case 0xB1: /* MOV imm,CL */
case 0xB2: /* MOV imm,DL */
case 0xB3: /* MOV imm,BL */
case 0xB4: /* MOV imm,AH */
case 0xB5: /* MOV imm,CH */
case 0xB6: /* MOV imm,DH */
case 0xB7: /* MOV imm,BH */
d32 = getUChar(eip); eip += 1;
t1 = newTemp(cb);
uInstr2(cb, MOV, 1, Literal, 0, TempReg, t1);
uLiteral(cb, d32);
uInstr2(cb, PUT, 1, TempReg, t1, ArchReg, opc-0xB0);
if (dis) VG_(printf)("movb $0x%x,%s\n", d32,
nameIReg(1,opc-0xB0));
break;
case 0xB8: /* MOV imm,eAX */
case 0xB9: /* MOV imm,eCX */
case 0xBA: /* MOV imm,eDX */
case 0xBB: /* MOV imm,eBX */
case 0xBD: /* MOV imm,eBP */
case 0xBE: /* MOV imm,eSI */
case 0xBF: /* MOV imm,eDI */
d32 = getUDisp(sz,eip); eip += sz;
t1 = newTemp(cb);
uInstr2(cb, MOV, sz, Literal, 0, TempReg, t1);
uLiteral(cb, d32);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, opc-0xB8);
if (dis) VG_(printf)("mov%c $0x%x,%s\n", nameISize(sz), d32,
nameIReg(sz,opc-0xB8));
break;
case 0xC6: /* MOV Ib,Eb */
sz = 1;
goto do_Mov_I_E;
case 0xC7: /* MOV Iv,Ev */
goto do_Mov_I_E;
do_Mov_I_E:
modrm = getUChar(eip);
if (epartIsReg(modrm)) {
d32 = getUDisp(sz,eip); eip += sz;
t1 = newTemp(cb);
uInstr2(cb, MOV, sz, Literal, 0, TempReg, t1);
uLiteral(cb, d32);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, eregOfRM(modrm));
if (dis) VG_(printf)("mov%c $0x%x, %s\n", nameISize(sz), d32,
nameIReg(sz,eregOfRM(modrm)));
} else {
pair = disAMode ( cb, eip, dis?dis_buf:NULL );
eip += HI8(pair);
d32 = getUDisp(sz,eip); eip += sz;
t1 = newTemp(cb);
t2 = LOW24(pair);
uInstr2(cb, MOV, sz, Literal, 0, TempReg, t1);
uLiteral(cb, d32);
uInstr2(cb, STORE, sz, TempReg, t1, TempReg, t2);
SMC_IF_SOME(cb);
if (dis) VG_(printf)("mov%c $0x%x, %s\n", nameISize(sz), d32, dis_buf);
}
break;
/* ------------------------ opl imm, A ----------------- */
case 0x04: /* ADD Ib, AL */
eip = dis_op_imm_A(cb, 1, ADD, True, eip, "add" );
break;
case 0x05: /* ADD Iv, eAX */
eip = dis_op_imm_A(cb, sz, ADD, True, eip, "add" );
break;
case 0x0C: /* OR Ib, AL */
eip = dis_op_imm_A(cb, 1, OR, True, eip, "or" );
break;
case 0x0D: /* OR Iv, eAX */
eip = dis_op_imm_A(cb, sz, OR, True, eip, "or" );
break;
case 0x1C: /* SBB Ib, AL */
eip = dis_op_imm_A(cb, 1, SBB, True, eip, "sbb" );
break;
case 0x24: /* AND Ib, AL */
eip = dis_op_imm_A(cb, 1, AND, True, eip, "and" );
break;
case 0x25: /* AND Iv, eAX */
eip = dis_op_imm_A(cb, sz, AND, True, eip, "and" );
break;
case 0x2C: /* SUB Ib, AL */
eip = dis_op_imm_A(cb, 1, SUB, True, eip, "sub" );
break;
case 0x2D: /* SUB Iv, eAX */
eip = dis_op_imm_A(cb, sz, SUB, True, eip, "sub" );
break;
case 0x34: /* XOR Ib, AL */
eip = dis_op_imm_A(cb, 1, XOR, True, eip, "xor" );
break;
case 0x35: /* XOR Iv, eAX */
eip = dis_op_imm_A(cb, sz, XOR, True, eip, "xor" );
break;
case 0x3C: /* CMP Ib, AL */
eip = dis_op_imm_A(cb, 1, SUB, False, eip, "cmp" );
break;
case 0x3D: /* CMP Iv, eAX */
eip = dis_op_imm_A(cb, sz, SUB, False, eip, "cmp" );
break;
case 0xA8: /* TEST Ib, AL */
eip = dis_op_imm_A(cb, 1, AND, False, eip, "test" );
break;
case 0xA9: /* TEST Iv, eAX */
eip = dis_op_imm_A(cb, sz, AND, False, eip, "test" );
break;
/* ------------------------ opl Ev, Gv ----------------- */
case 0x02: /* ADD Eb,Gb */
eip = dis_op2_E_G ( cb, ADD, True, 1, eip, "add" );
break;
case 0x03: /* ADD Ev,Gv */
eip = dis_op2_E_G ( cb, ADD, True, sz, eip, "add" );
break;
case 0x0A: /* OR Eb,Gb */
eip = dis_op2_E_G ( cb, OR, True, 1, eip, "or" );
break;
case 0x0B: /* OR Ev,Gv */
eip = dis_op2_E_G ( cb, OR, True, sz, eip, "or" );
break;
case 0x13: /* ADC Ev,Gv */
eip = dis_op2_E_G ( cb, ADC, True, sz, eip, "adc" );
break;
case 0x1B: /* SBB Ev,Gv */
eip = dis_op2_E_G ( cb, SBB, True, sz, eip, "sbb" );
break;
case 0x22: /* AND Eb,Gb */
eip = dis_op2_E_G ( cb, AND, True, 1, eip, "and" );
break;
case 0x23: /* AND Ev,Gv */
eip = dis_op2_E_G ( cb, AND, True, sz, eip, "and" );
break;
case 0x2A: /* SUB Eb,Gb */
eip = dis_op2_E_G ( cb, SUB, True, 1, eip, "sub" );
break;
case 0x2B: /* SUB Ev,Gv */
eip = dis_op2_E_G ( cb, SUB, True, sz, eip, "sub" );
break;
case 0x32: /* XOR Eb,Gb */
eip = dis_op2_E_G ( cb, XOR, True, 1, eip, "xor" );
break;
case 0x33: /* XOR Ev,Gv */
eip = dis_op2_E_G ( cb, XOR, True, sz, eip, "xor" );
break;
case 0x3A: /* CMP Eb,Gb */
eip = dis_op2_E_G ( cb, SUB, False, 1, eip, "cmp" );
break;
case 0x3B: /* CMP Ev,Gv */
eip = dis_op2_E_G ( cb, SUB, False, sz, eip, "cmp" );
break;
case 0x84: /* TEST Eb,Gb */
eip = dis_op2_E_G ( cb, AND, False, 1, eip, "test" );
break;
case 0x85: /* TEST Ev,Gv */
eip = dis_op2_E_G ( cb, AND, False, sz, eip, "test" );
break;
/* ------------------------ opl Gv, Ev ----------------- */
case 0x00: /* ADD Gb,Eb */
eip = dis_op2_G_E ( cb, ADD, True, 1, eip, "add" );
break;
case 0x01: /* ADD Gv,Ev */
eip = dis_op2_G_E ( cb, ADD, True, sz, eip, "add" );
break;
case 0x08: /* OR Gb,Eb */
eip = dis_op2_G_E ( cb, OR, True, 1, eip, "or" );
break;
case 0x09: /* OR Gv,Ev */
eip = dis_op2_G_E ( cb, OR, True, sz, eip, "or" );
break;
case 0x11: /* ADC Gv,Ev */
eip = dis_op2_G_E ( cb, ADC, True, sz, eip, "adc" );
break;
case 0x19: /* SBB Gv,Ev */
eip = dis_op2_G_E ( cb, SBB, True, sz, eip, "sbb" );
break;
case 0x20: /* AND Gb,Eb */
eip = dis_op2_G_E ( cb, AND, True, 1, eip, "and" );
break;
case 0x21: /* AND Gv,Ev */
eip = dis_op2_G_E ( cb, AND, True, sz, eip, "and" );
break;
case 0x28: /* SUB Gb,Eb */
eip = dis_op2_G_E ( cb, SUB, True, 1, eip, "sub" );
break;
case 0x29: /* SUB Gv,Ev */
eip = dis_op2_G_E ( cb, SUB, True, sz, eip, "sub" );
break;
case 0x30: /* XOR Gb,Eb */
eip = dis_op2_G_E ( cb, XOR, True, 1, eip, "xor" );
break;
case 0x31: /* XOR Gv,Ev */
eip = dis_op2_G_E ( cb, XOR, True, sz, eip, "xor" );
break;
case 0x38: /* CMP Gb,Eb */
eip = dis_op2_G_E ( cb, SUB, False, 1, eip, "cmp" );
break;
case 0x39: /* CMP Gv,Ev */
eip = dis_op2_G_E ( cb, SUB, False, sz, eip, "cmp" );
break;
/* ------------------------ POP ------------------------ */
case 0x58: /* POP eAX */
case 0x59: /* POP eCX */
case 0x5A: /* POP eDX */
case 0x5B: /* POP eBX */
case 0x5D: /* POP eBP */
case 0x5E: /* POP eSI */
case 0x5F: /* POP eDI */
{ Int n_pops;
Addr eipS, eipE;
UChar ch;
if (sz != 4) goto normal_pop_case;
if (VG_(clo_cachesim)) goto normal_pop_case;
/* eip points at first pop insn + 1. Make eipS and eipE
bracket the sequence. */
eipE = eipS = eip - 1;
while (True) {
ch = getUChar(eipE+1);
if (ch < 0x58 || ch > 0x5F || ch == 0x5C) break;
eipE++;
}
n_pops = eipE - eipS + 1;
if (0 && n_pops > 1) VG_(printf)("%d pops\n", n_pops);
t1 = newTemp(cb); t3 = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ESP, TempReg, t1);
for (; eipS <= eipE; eipS++) {
ch = getUChar(eipS);
uInstr2(cb, LOAD, 4, TempReg, t1, TempReg, t3);
uInstr2(cb, PUT, 4, TempReg, t3, ArchReg, ch-0x58);
uInstr2(cb, ADD, 4, Literal, 0, TempReg, t1);
uLiteral(cb, 4);
SMC_IF_ALL(cb);
if (dis)
VG_(printf)("popl %s\n", nameIReg(4,ch-0x58));
}
uInstr2(cb, PUT, 4, TempReg, t1, ArchReg, R_ESP);
eip = eipE + 1;
break;
}
case 0x5C: /* POP eSP */
normal_pop_case:
t1 = newTemp(cb); t2 = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ESP, TempReg, t2);
uInstr2(cb, LOAD, sz, TempReg, t2, TempReg, t1);
uInstr2(cb, ADD, 4, Literal, 0, TempReg, t2);
uLiteral(cb, sz);
uInstr2(cb, PUT, 4, TempReg, t2, ArchReg, R_ESP);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, opc-0x58);
if (dis)
VG_(printf)("pop%c %s\n", nameISize(sz), nameIReg(sz,opc-0x58));
break;
case 0x9D: /* POPF */
vg_assert(sz == 2 || sz == 4);
t1 = newTemp(cb); t2 = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ESP, TempReg, t2);
uInstr2(cb, LOAD, sz, TempReg, t2, TempReg, t1);
uInstr2(cb, ADD, 4, Literal, 0, TempReg, t2);
uLiteral(cb, sz);
uInstr2(cb, PUT, 4, TempReg, t2, ArchReg, R_ESP);
uInstr1(cb, PUTF, sz, TempReg, t1);
/* PUTF writes all the flags we are interested in */
uFlagsRWU(cb, FlagsEmpty, FlagsALL, FlagsEmpty);
if (dis)
VG_(printf)("popf%c\n", nameISize(sz));
break;
case 0x61: /* POPA */
{ Int reg;
/* Just to keep things sane, we assert for a size 4. It's
probably OK for size 2 as well, but I'd like to find a test
case; ie, have the assertion fail, before committing to it.
If it fails for you, uncomment the sz == 2 bit, try again,
and let me know whether or not it works. (jseward@acm.org). */
vg_assert(sz == 4 /* || sz == 2 */);
/* Eight values are popped, one per register, but the value of
%esp on the stack is ignored and instead incremented (in one
hit at the end) for each of the values. */
t1 = newTemp(cb); t2 = newTemp(cb); t3 = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ESP, TempReg, t2);
uInstr2(cb, MOV, 4, TempReg, t2, TempReg, t3);
/* Do %edi, %esi, %ebp */
for (reg = 7; reg >= 5; reg--) {
uInstr2(cb, LOAD, sz, TempReg, t2, TempReg, t1);
uInstr2(cb, ADD, 4, Literal, 0, TempReg, t2);
uLiteral(cb, sz);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, reg);
}
/* Ignore (skip) value of %esp on stack. */
uInstr2(cb, ADD, 4, Literal, 0, TempReg, t2);
uLiteral(cb, sz);
/* Do %ebx, %edx, %ecx, %eax */
for (reg = 3; reg >= 0; reg--) {
uInstr2(cb, LOAD, sz, TempReg, t2, TempReg, t1);
uInstr2(cb, ADD, 4, Literal, 0, TempReg, t2);
uLiteral(cb, sz);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, reg);
}
uInstr2(cb, ADD, 4, Literal, 0, TempReg, t3);
uLiteral(cb, sz * 8); /* One 'sz' per register */
uInstr2(cb, PUT, 4, TempReg, t3, ArchReg, R_ESP);
if (dis)
VG_(printf)("popa%c\n", nameISize(sz));
break;
}
case 0x8F: /* POPL/POPW m32 */
{ UInt pair1;
Int tmpa;
UChar rm = getUChar(eip);
/* make sure this instruction is correct POP */
vg_assert(!epartIsReg(rm) && (gregOfRM(rm) == 0));
/* and has correct size */
vg_assert(sz == 4);
t1 = newTemp(cb); t3 = newTemp(cb);
/* set t1 to ESP: t1 = ESP */
uInstr2(cb, GET, 4, ArchReg, R_ESP, TempReg, t1);
/* load M[ESP] to virtual register t3: t3 = M[t1] */
uInstr2(cb, LOAD, 4, TempReg, t1, TempReg, t3);
/* resolve MODR/M */
pair1 = disAMode ( cb, eip, dis?dis_buf:NULL);
tmpa = LOW24(pair1);
/* uInstr2(cb, LOAD, sz, TempReg, tmpa, TempReg, tmpa); */
/* store value from stack in memory, M[m32] = t3 */
uInstr2(cb, STORE, 4, TempReg, t3, TempReg, tmpa);
/* increase ESP */
uInstr2(cb, ADD, 4, Literal, 0, TempReg, t1);
uLiteral(cb, sz);
uInstr2(cb, PUT, 4, TempReg, t1, ArchReg, R_ESP);
if (dis)
VG_(printf)("popl %s\n", dis_buf);
eip += HI8(pair1);
break;
}
/* ------------------------ PUSH ----------------------- */
case 0x50: /* PUSH eAX */
case 0x51: /* PUSH eCX */
case 0x52: /* PUSH eDX */
case 0x53: /* PUSH eBX */
case 0x55: /* PUSH eBP */
case 0x56: /* PUSH eSI */
case 0x57: /* PUSH eDI */
{ Int n_pushes;
Addr eipS, eipE;
UChar ch;
if (sz != 4) goto normal_push_case;
if (VG_(clo_cachesim)) goto normal_push_case;
/* eip points at first push insn + 1. Make eipS and eipE
bracket the sequence. */
eipE = eipS = eip - 1;
while (True) {
ch = getUChar(eipE+1);
if (ch < 0x50 || ch > 0x57 || ch == 0x54) break;
eipE++;
}
n_pushes = eipE - eipS + 1;
if (0 && n_pushes > 1) VG_(printf)("%d pushes\n", n_pushes);
t1 = newTemp(cb); t2 = newTemp(cb); t3 = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ESP, TempReg, t1);
uInstr2(cb, MOV, 4, TempReg, t1, TempReg, t2);
uInstr2(cb, SUB, 4, Literal, 0, TempReg, t2);
uLiteral(cb, 4 * n_pushes);
uInstr2(cb, PUT, 4, TempReg, t2, ArchReg, R_ESP);
for (; eipS <= eipE; eipS++) {
ch = getUChar(eipS);
uInstr2(cb, SUB, 4, Literal, 0, TempReg, t1);
uLiteral(cb, 4);
uInstr2(cb, GET, 4, ArchReg, ch-0x50, TempReg, t3);
uInstr2(cb, STORE, 4, TempReg, t3, TempReg, t1);
SMC_IF_ALL(cb);
if (dis)
VG_(printf)("pushl %s\n", nameIReg(4,ch-0x50));
}
eip = eipE + 1;
break;
}
case 0x54: /* PUSH eSP */
normal_push_case:
/* This is the Right Way, in that the value to be pushed is
established before %esp is changed, so that pushl %esp
correctly pushes the old value. */
t1 = newTemp(cb); t2 = newTemp(cb); t3 = newTemp(cb);
uInstr2(cb, GET, sz, ArchReg, opc-0x50, TempReg, t1);
uInstr2(cb, GET, 4, ArchReg, R_ESP, TempReg, t3);
uInstr2(cb, MOV, 4, TempReg, t3, TempReg, t2);
uInstr2(cb, SUB, 4, Literal, 0, TempReg, t2);
uLiteral(cb, sz);
uInstr2(cb, PUT, 4, TempReg, t2, ArchReg, R_ESP);
uInstr2(cb, STORE, sz, TempReg, t1, TempReg, t2);
SMC_IF_ALL(cb);
if (dis)
VG_(printf)("push%c %s\n", nameISize(sz), nameIReg(sz,opc-0x50));
break;
case 0x68: /* PUSH Iv */
d32 = getUDisp(sz,eip); eip += sz;
goto do_push_I;
case 0x6A: /* PUSH Ib, sign-extended to sz */
d32 = getSDisp8(eip); eip += 1;
goto do_push_I;
do_push_I:
t1 = newTemp(cb); t2 = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ESP, TempReg, t1);
uInstr2(cb, SUB, 4, Literal, 0, TempReg, t1);
uLiteral(cb, sz);
uInstr2(cb, PUT, 4, TempReg, t1, ArchReg, R_ESP);
uInstr2(cb, MOV, sz, Literal, 0, TempReg, t2);
uLiteral(cb, d32);
uInstr2(cb, STORE, sz, TempReg, t2, TempReg, t1);
SMC_IF_ALL(cb);
if (dis)
VG_(printf)("push%c $0x%x\n", nameISize(sz), d32);
break;
case 0x9C: /* PUSHF */
vg_assert(sz == 2 || sz == 4);
t1 = newTemp(cb); t2 = newTemp(cb); t3 = newTemp(cb);
uInstr1(cb, GETF, sz, TempReg, t1);
/* GETF reads all the flags we are interested in */
uFlagsRWU(cb, FlagsALL, FlagsEmpty, FlagsEmpty);
uInstr2(cb, GET, 4, ArchReg, R_ESP, TempReg, t3);
uInstr2(cb, MOV, 4, TempReg, t3, TempReg, t2);
uInstr2(cb, SUB, 4, Literal, 0, TempReg, t2);
uLiteral(cb, sz);
uInstr2(cb, PUT, 4, TempReg, t2, ArchReg, R_ESP);
uInstr2(cb, STORE, sz, TempReg, t1, TempReg, t2);
SMC_IF_ALL(cb);
if (dis)
VG_(printf)("pushf%c\n", nameISize(sz));
break;
case 0x60: /* PUSHA */
{ Int reg;
/* Just to keep things sane, we assert for a size 4. It's
probably OK for size 2 as well, but I'd like to find a test
case; ie, have the assertion fail, before committing to it.
If it fails for you, uncomment the sz == 2 bit, try again,
and let me know whether or not it works. (jseward@acm.org). */
vg_assert(sz == 4 /* || sz == 2 */);
/* This is the Right Way, in that the value to be pushed is
established before %esp is changed, so that pusha
correctly pushes the old %esp value. New value of %esp is
pushed at start. */
t1 = newTemp(cb); t2 = newTemp(cb); t3 = newTemp(cb);
t4 = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, R_ESP, TempReg, t3);
uInstr2(cb, MOV, 4, TempReg, t3, TempReg, t2);
uInstr2(cb, MOV, 4, TempReg, t3, TempReg, t4);
uInstr2(cb, SUB, 4, Literal, 0, TempReg, t4);
uLiteral(cb, sz * 8); /* One 'sz' per register. */
uInstr2(cb, PUT, 4, TempReg, t4, ArchReg, R_ESP);
/* Do %eax, %ecx, %edx, %ebx */
for (reg = 0; reg <= 3; reg++) {
uInstr2(cb, GET, sz, ArchReg, reg, TempReg, t1);
uInstr2(cb, SUB, 4, Literal, 0, TempReg, t2);
uLiteral(cb, sz);
uInstr2(cb, STORE, sz, TempReg, t1, TempReg, t2);
SMC_IF_ALL(cb);
}
/* Push old value of %esp */
uInstr2(cb, SUB, 4, Literal, 0, TempReg, t2);
uLiteral(cb, sz);
uInstr2(cb, STORE, sz, TempReg, t3, TempReg, t2);
SMC_IF_ALL(cb);
/* Do %ebp, %esi, %edi */
for (reg = 5; reg <= 7; reg++) {
uInstr2(cb, GET, sz, ArchReg, reg, TempReg, t1);
uInstr2(cb, SUB, 4, Literal, 0, TempReg, t2);
uLiteral(cb, sz);
uInstr2(cb, STORE, sz, TempReg, t1, TempReg, t2);
SMC_IF_ALL(cb);
}
if (dis)
VG_(printf)("pusha%c\n", nameISize(sz));
break;
}
/* ------------------------ SCAS et al ----------------- */
case 0xA4: /* MOVSb, no REP prefix */
codegen_MOVS ( cb, 1 );
if (dis) VG_(printf)("movsb\n");
break;
case 0xA5: /* MOVSv, no REP prefix */
codegen_MOVS ( cb, sz );
if (dis) VG_(printf)("movs%c\n", nameISize(sz));
break;
case 0xA6: /* CMPSb, no REP prefix */
codegen_CMPS ( cb, 1 );
if (dis) VG_(printf)("cmpsb\n");
break;
case 0xAA: /* STOSb, no REP prefix */
codegen_STOS ( cb, 1 );
if (dis) VG_(printf)("stosb\n");
break;
case 0xAB: /* STOSv, no REP prefix */
codegen_STOS ( cb, sz );
if (dis) VG_(printf)("stos%c\n", nameISize(sz));
break;
case 0xAC: /* LODSb, no REP prefix */
codegen_LODS ( cb, 1 );
if (dis) VG_(printf)("lodsb\n");
break;
case 0xAD: /* LODSv, no REP prefix */
codegen_LODS ( cb, sz );
if (dis) VG_(printf)("lods%c\n", nameISize(sz));
break;
case 0xAE: /* SCASb, no REP prefix */
codegen_SCAS ( cb, 1 );
if (dis) VG_(printf)("scasb\n");
break;
case 0xFC: /* CLD */
uInstr0(cb, CALLM_S, 0);
uInstr1(cb, CALLM, 0, Lit16, VGOFF_(helper_CLD));
uFlagsRWU(cb, FlagsEmpty, FlagD, FlagsEmpty);
uInstr0(cb, CALLM_E, 0);
if (dis) VG_(printf)("cld\n");
break;
case 0xFD: /* STD */
uInstr0(cb, CALLM_S, 0);
uInstr1(cb, CALLM, 0, Lit16, VGOFF_(helper_STD));
uFlagsRWU(cb, FlagsEmpty, FlagD, FlagsEmpty);
uInstr0(cb, CALLM_E, 0);
if (dis) VG_(printf)("std\n");
break;
case 0xF2: { /* REPNE prefix insn */
Addr eip_orig = eip - 1;
abyte = getUChar(eip); eip++;
if (abyte == 0x66) { sz = 2; abyte = getUChar(eip); eip++; }
if (abyte == 0xAE || 0xAF) { /* REPNE SCAS<sz> */
if (abyte == 0xAE) sz = 1;
codegen_REPNE_SCAS ( cb, sz, eip_orig, eip );
*isEnd = True;
if (dis) VG_(printf)("repne scas%c\n", nameISize(sz));
}
else {
VG_(printf)("REPNE then 0x%x\n", (UInt)abyte);
VG_(panic)("Unhandled REPNE case");
}
break;
}
case 0xF3: { /* REPE prefix insn */
Addr eip_orig = eip - 1;
abyte = getUChar(eip); eip++;
if (abyte == 0x66) { sz = 2; abyte = getUChar(eip); eip++; }
if (abyte == 0xA4 || abyte == 0xA5) { /* REPE MOV<sz> */
if (abyte == 0xA4) sz = 1;
codegen_REPE_MOVS ( cb, sz, eip_orig, eip );
*isEnd = True;
if (dis) VG_(printf)("repe mov%c\n", nameISize(sz));
}
else
if (abyte == 0xA6 || abyte == 0xA7) { /* REPE CMP<sz> */
if (abyte == 0xA6) sz = 1;
codegen_REPE_CMPS ( cb, sz, eip_orig, eip );
*isEnd = True;
if (dis) VG_(printf)("repe cmps%c\n", nameISize(sz));
}
else
if (abyte == 0xAA || abyte == 0xAB) { /* REPE STOS<sz> */
if (abyte == 0xAA) sz = 1;
codegen_REPE_STOS ( cb, sz, eip_orig, eip );
*isEnd = True;
if (dis) VG_(printf)("repe stos%c\n", nameISize(sz));
} else {
VG_(printf)("REPE then 0x%x\n", (UInt)abyte);
VG_(panic)("Unhandled REPE case");
}
break;
}
/* ------------------------ XCHG ----------------------- */
case 0x86: /* XCHG Gb,Eb */
sz = 1;
/* Fall through ... */
case 0x87: /* XCHG Gv,Ev */
modrm = getUChar(eip);
t1 = newTemp(cb); t2 = newTemp(cb);
if (epartIsReg(modrm)) {
uInstr2(cb, GET, sz, ArchReg, eregOfRM(modrm), TempReg, t1);
uInstr2(cb, GET, sz, ArchReg, gregOfRM(modrm), TempReg, t2);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, gregOfRM(modrm));
uInstr2(cb, PUT, sz, TempReg, t2, ArchReg, eregOfRM(modrm));
eip++;
if (dis)
VG_(printf)("xchg%c %s, %s\n", nameISize(sz),
nameIReg(sz,gregOfRM(modrm)),
nameIReg(sz,eregOfRM(modrm)));
} else {
pair = disAMode ( cb, eip, dis?dis_buf:NULL);
t3 = LOW24(pair);
uInstr2(cb, LOAD, sz, TempReg, t3, TempReg, t1);
uInstr2(cb, GET, sz, ArchReg, gregOfRM(modrm), TempReg, t2);
uInstr2(cb, STORE, sz, TempReg, t2, TempReg, t3);
SMC_IF_SOME(cb);
uInstr2(cb, PUT, sz, TempReg, t1, ArchReg, gregOfRM(modrm));
eip += HI8(pair);
if (dis)
VG_(printf)("xchg%c %s, %s\n", nameISize(sz),
nameIReg(sz,gregOfRM(modrm)),
dis_buf);
}
break;
case 0x90: /* XCHG eAX,eAX */
if (dis) VG_(printf)("nop\n");
break;
case 0x91: /* XCHG eCX,eSI */
case 0x96: /* XCHG eAX,eSI */
case 0x97: /* XCHG eAX,eDI */
codegen_xchg_eAX_Reg ( cb, sz, opc - 0x90 );
break;
/* ------------------------ (Grp1 extensions) ---------- */
case 0x80: /* Grp1 Ib,Eb */
modrm = getUChar(eip);
am_sz = lengthAMode(eip);
sz = 1;
d_sz = 1;
d32 = getSDisp8(eip + am_sz);
eip = dis_Grp1 ( cb, eip, modrm, am_sz, d_sz, sz, d32 );
break;
case 0x81: /* Grp1 Iv,Ev */
modrm = getUChar(eip);
am_sz = lengthAMode(eip);
d_sz = sz;
d32 = getUDisp(d_sz, eip + am_sz);
eip = dis_Grp1 ( cb, eip, modrm, am_sz, d_sz, sz, d32 );
break;
case 0x83: /* Grp1 Ib,Ev */
modrm = getUChar(eip);
am_sz = lengthAMode(eip);
d_sz = 1;
d32 = getSDisp8(eip + am_sz);
eip = dis_Grp1 ( cb, eip, modrm, am_sz, d_sz, sz, d32 );
break;
/* ------------------------ (Grp2 extensions) ---------- */
case 0xC0: /* Grp2 Ib,Eb */
modrm = getUChar(eip);
am_sz = lengthAMode(eip);
d_sz = 1;
d32 = getSDisp8(eip + am_sz);
sz = 1;
eip = dis_Grp2 ( cb, eip, modrm, am_sz, d_sz, sz, Literal, d32 );
break;
case 0xC1: /* Grp2 Ib,Ev */
modrm = getUChar(eip);
am_sz = lengthAMode(eip);
d_sz = 1;
d32 = getSDisp8(eip + am_sz);
eip = dis_Grp2 ( cb, eip, modrm, am_sz, d_sz, sz, Literal, d32 );
break;
case 0xD0: /* Grp2 1,Eb */
modrm = getUChar(eip);
am_sz = lengthAMode(eip);
d_sz = 0;
d32 = 1;
sz = 1;
eip = dis_Grp2 ( cb, eip, modrm, am_sz, d_sz, sz, Literal, d32 );
break;
case 0xD1: /* Grp2 1,Ev */
modrm = getUChar(eip);
am_sz = lengthAMode(eip);
d_sz = 0;
d32 = 1;
eip = dis_Grp2 ( cb, eip, modrm, am_sz, d_sz, sz, Literal, d32 );
break;
case 0xD3: /* Grp2 CL,Ev */
modrm = getUChar(eip);
am_sz = lengthAMode(eip);
d_sz = 0;
eip = dis_Grp2 ( cb, eip, modrm, am_sz, d_sz, sz, ArchReg, R_ECX );
break;
/* ------------------------ (Grp3 extensions) ---------- */
case 0xF6: /* Grp3 Eb */
eip = dis_Grp3 ( cb, 1, eip );
break;
case 0xF7: /* Grp3 Ev */
eip = dis_Grp3 ( cb, sz, eip );
break;
/* ------------------------ (Grp4 extensions) ---------- */
case 0xFE: /* Grp4 Eb */
eip = dis_Grp4 ( cb, eip );
break;
/* ------------------------ (Grp5 extensions) ---------- */
case 0xFF: /* Grp5 Ev */
eip = dis_Grp5 ( cb, sz, eip, isEnd );
break;
/* ------------------------ Escapes to 2-byte opcodes -- */
case 0x0F: {
opc = getUChar(eip); eip++;
switch (opc) {
/* =-=-=-=-=-=-=-=-=- Grp8 =-=-=-=-=-=-=-=-=-=-=-= */
case 0xBA: /* Grp8 Ib,Ev */
modrm = getUChar(eip);
am_sz = lengthAMode(eip);
d32 = getSDisp8(eip + am_sz);
eip = dis_Grp8_BT ( cb, eip, modrm, am_sz, sz, d32 );
break;
/* =-=-=-=-=-=-=-=-=- BSF/BSR -=-=-=-=-=-=-=-=-=-= */
case 0xBC: /* BSF Gv,Ev */
eip = dis_bs_E_G ( cb, sz, eip, True );
break;
case 0xBD: /* BSR Gv,Ev */
eip = dis_bs_E_G ( cb, sz, eip, False );
break;
/* =-=-=-=-=-=-=-=-=- BSWAP -=-=-=-=-=-=-=-=-=-=-= */
case 0xC8: /* BSWAP %eax */
case 0xC9:
case 0xCA:
case 0xCB:
case 0xCC:
case 0xCD:
case 0xCE:
case 0xCF: /* BSWAP %edi */
/* AFAICS from the Intel docs, this only exists at size 4. */
vg_assert(sz == 4);
t1 = newTemp(cb);
uInstr2(cb, GET, 4, ArchReg, opc-0xC8, TempReg, t1);
uInstr1(cb, BSWAP, 4, TempReg, t1);
uInstr2(cb, PUT, 4, TempReg, t1, ArchReg, opc-0xC8);
if (dis) VG_(printf)("bswapl %s\n", nameIReg(4, opc-0xC8));
break;
/* =-=-=-=-=-=-=-=-=- BT/BTS/BTR/BTC =-=-=-=-=-=-= */
case 0xA3: /* BT Gv,Ev */
eip = dis_bt_G_E ( cb, sz, eip, BtOpNone );
break;
case 0xB3: /* BTR Gv,Ev */
eip = dis_bt_G_E ( cb, sz, eip, BtOpReset );
break;
case 0xAB: /* BTS Gv,Ev */
eip = dis_bt_G_E ( cb, sz, eip, BtOpSet );
break;
case 0xBB: /* BTC Gv,Ev */
eip = dis_bt_G_E ( cb, sz, eip, BtOpComp );
break;
/* =-=-=-=-=-=-=-=-=- CMOV =-=-=-=-=-=-=-=-=-=-=-= */
case 0x40:
case 0x41:
case 0x42: /* CMOVBb/CMOVNAEb (cmov below) */
case 0x43: /* CMOVNBb/CMOVAEb (cmov not below) */
case 0x44: /* CMOVZb/CMOVEb (cmov zero) */
case 0x45: /* CMOVNZb/CMOVNEb (cmov not zero) */
case 0x46: /* CMOVBEb/CMOVNAb (cmov below or equal) */
case 0x47: /* CMOVNBEb/CMOVAb (cmov not below or equal) */
case 0x48: /* CMOVSb (cmov negative) */
case 0x49: /* CMOVSb (cmov not negative) */
case 0x4A: /* CMOVP (cmov parity even) */
case 0x4B: /* CMOVNP (cmov parity odd) */
case 0x4C: /* CMOVLb/CMOVNGEb (cmov less) */
case 0x4D: /* CMOVGEb/CMOVNLb (cmov greater or equal) */
case 0x4E: /* CMOVLEb/CMOVNGb (cmov less or equal) */
case 0x4F: /* CMOVGb/CMOVNLEb (cmov greater) */
eip = dis_cmov_E_G(cb, sz, (Condcode)(opc - 0x40), eip);
break;
/* =-=-=-=-=-=-=-=-=- CMPXCHG -=-=-=-=-=-=-=-=-=-= */
case 0xB1: /* CMPXCHG Gv,Ev */
eip = dis_cmpxchg_G_E ( cb, sz, eip );
break;
/* =-=-=-=-=-=-=-=-=- CPUID -=-=-=-=-=-=-=-=-=-=-= */
case 0xA2: /* CPUID */
t1 = newTemp(cb);
t2 = newTemp(cb);
t3 = newTemp(cb);
t4 = newTemp(cb);
uInstr0(cb, CALLM_S, 0);
uInstr2(cb, GET, 4, ArchReg, R_EAX, TempReg, t1);
uInstr1(cb, PUSH, 4, TempReg, t1);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, t2);
uLiteral(cb, 0);
uInstr1(cb, PUSH, 4, TempReg, t2);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, t3);
uLiteral(cb, 0);
uInstr1(cb, PUSH, 4, TempReg, t3);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, t4);
uLiteral(cb, 0);
uInstr1(cb, PUSH, 4, TempReg, t4);
uInstr1(cb, CALLM, 0, Lit16, VGOFF_(helper_CPUID));
uFlagsRWU(cb, FlagsEmpty, FlagsEmpty, FlagsEmpty);
uInstr1(cb, POP, 4, TempReg, t4);
uInstr2(cb, PUT, 4, TempReg, t4, ArchReg, R_EDX);
uInstr1(cb, POP, 4, TempReg, t3);
uInstr2(cb, PUT, 4, TempReg, t3, ArchReg, R_ECX);
uInstr1(cb, POP, 4, TempReg, t2);
uInstr2(cb, PUT, 4, TempReg, t2, ArchReg, R_EBX);
uInstr1(cb, POP, 4, TempReg, t1);
uInstr2(cb, PUT, 4, TempReg, t1, ArchReg, R_EAX);
uInstr0(cb, CALLM_E, 0);
if (dis) VG_(printf)("cpuid\n");
break;
/* =-=-=-=-=-=-=-=-=- MOVZX, MOVSX =-=-=-=-=-=-=-= */
case 0xB6: /* MOVZXb Eb,Gv */
eip = dis_movx_E_G ( cb, eip, 1, 4, False );
break;
case 0xB7: /* MOVZXw Ew,Gv */
eip = dis_movx_E_G ( cb, eip, 2, 4, False );
break;
case 0xBE: /* MOVSXb Eb,Gv */
eip = dis_movx_E_G ( cb, eip, 1, 4, True );
break;
case 0xBF: /* MOVSXw Ew,Gv */
eip = dis_movx_E_G ( cb, eip, 2, 4, True );
break;
/* =-=-=-=-=-=-=-=-=- MUL/IMUL =-=-=-=-=-=-=-=-=-= */
case 0xAF: /* IMUL Ev, Gv */
eip = dis_mul_E_G ( cb, sz, eip, True );
break;
/* =-=-=-=-=-=-=-=-=- Jcond d32 -=-=-=-=-=-=-=-=-= */
case 0x80:
case 0x81:
case 0x82: /* JBb/JNAEb (jump below) */
case 0x83: /* JNBb/JAEb (jump not below) */
case 0x84: /* JZb/JEb (jump zero) */
case 0x85: /* JNZb/JNEb (jump not zero) */
case 0x86: /* JBEb/JNAb (jump below or equal) */
case 0x87: /* JNBEb/JAb (jump not below or equal) */
case 0x88: /* JSb (jump negative) */
case 0x89: /* JSb (jump not negative) */
case 0x8A: /* JP (jump parity even) */
case 0x8B: /* JNP/JPO (jump parity odd) */
case 0x8C: /* JLb/JNGEb (jump less) */
case 0x8D: /* JGEb/JNLb (jump greater or equal) */
case 0x8E: /* JLEb/JNGb (jump less or equal) */
case 0x8F: /* JGb/JNLEb (jump greater) */
d32 = (eip+4) + getUDisp32(eip); eip += 4;
uInstr1(cb, JMP, 0, Literal, 0);
uLiteral(cb, d32);
uCond(cb, (Condcode)(opc - 0x80));
uFlagsRWU(cb, FlagsOSZACP, FlagsEmpty, FlagsEmpty);
uInstr1(cb, JMP, 0, Literal, 0);
uLiteral(cb, eip);
uCond(cb, CondAlways);
*isEnd = True;
if (dis)
VG_(printf)("j%s-32 0x%x\n",
VG_(nameCondcode)(opc - 0x80), d32);
break;
/* =-=-=-=-=-=-=-=-=- RDTSC -=-=-=-=-=-=-=-=-=-=-= */
case 0x31: /* RDTSC */
t1 = newTemp(cb);
t2 = newTemp(cb);
t3 = newTemp(cb);
uInstr0(cb, CALLM_S, 0);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, t1);
uLiteral(cb, 0);
uInstr1(cb, PUSH, 4, TempReg, t1);
uInstr2(cb, MOV, 4, Literal, 0, TempReg, t2);
uLiteral(cb, 0);
uInstr1(cb, PUSH, 4, TempReg, t2);
uInstr1(cb, CALLM, 0, Lit16, VGOFF_(helper_RDTSC));
uFlagsRWU(cb, FlagsEmpty, FlagsEmpty, FlagsEmpty);
uInstr1(cb, POP, 4, TempReg, t3);
uInstr2(cb, PUT, 4, TempReg, t3, ArchReg, R_EDX);
uInstr1(cb, POP, 4, TempReg, t3);
uInstr2(cb, PUT, 4, TempReg, t3, ArchReg, R_EAX);
uInstr0(cb, CALLM_E, 0);
if (dis) VG_(printf)("rdtsc\n");
break;
/* =-=-=-=-=-=-=-=-=- SETcc Eb =-=-=-=-=-=-=-=-=-= */
case 0x90:
case 0x91:
case 0x92: /* set-Bb/set-NAEb (jump below) */
case 0x93: /* set-NBb/set-AEb (jump not below) */
case 0x94: /* set-Zb/set-Eb (jump zero) */
case 0x95: /* set-NZb/set-NEb (jump not zero) */
case 0x96: /* set-BEb/set-NAb (jump below or equal) */
case 0x97: /* set-NBEb/set-Ab (jump not below or equal) */
case 0x98: /* set-Sb (jump negative) */
case 0x99: /* set-Sb (jump not negative) */
case 0x9A: /* set-P (jump parity even) */
case 0x9B: /* set-NP (jump parity odd) */
case 0x9C: /* set-Lb/set-NGEb (jump less) */
case 0x9D: /* set-GEb/set-NLb (jump greater or equal) */
case 0x9E: /* set-LEb/set-NGb (jump less or equal) */
case 0x9F: /* set-Gb/set-NLEb (jump greater) */
modrm = getUChar(eip);
t1 = newTemp(cb);
if (epartIsReg(modrm)) {
eip++;
uInstr1(cb, CC2VAL, 1, TempReg, t1);
uCond(cb, (Condcode)(opc-0x90));
uFlagsRWU(cb, FlagsOSZACP, FlagsEmpty, FlagsEmpty);
uInstr2(cb, PUT, 1, TempReg, t1, ArchReg, eregOfRM(modrm));
if (dis) VG_(printf)("set%s %s\n",
VG_(nameCondcode)(opc-0x90),
nameIReg(1,eregOfRM(modrm)));
} else {
pair = disAMode ( cb, eip, dis?dis_buf:NULL );
t2 = LOW24(pair);
eip += HI8(pair);
uInstr1(cb, CC2VAL, 1, TempReg, t1);
uCond(cb, (Condcode)(opc-0x90));
uFlagsRWU(cb, FlagsOSZACP, FlagsEmpty, FlagsEmpty);
uInstr2(cb, STORE, 1, TempReg, t1, TempReg, t2);
SMC_IF_ALL(cb);
if (dis) VG_(printf)("set%s %s\n",
VG_(nameCondcode)(opc-0x90),
dis_buf);
}
break;
/* =-=-=-=-=-=-=-=-=- SHLD/SHRD -=-=-=-=-=-=-=-=-= */
case 0xA4: /* SHLDv imm8,Gv,Ev */
modrm = getUChar(eip);
eip = dis_SHLRD_Gv_Ev (
cb, eip, modrm, sz,
Literal, getUChar(eip + lengthAMode(eip)),
True );
break;
case 0xA5: /* SHLDv %cl,Gv,Ev */
modrm = getUChar(eip);
eip = dis_SHLRD_Gv_Ev (
cb, eip, modrm, sz, ArchReg, R_CL, True );
break;
case 0xAC: /* SHRDv imm8,Gv,Ev */
modrm = getUChar(eip);
eip = dis_SHLRD_Gv_Ev (
cb, eip, modrm, sz,
Literal, getUChar(eip + lengthAMode(eip)),
False );
break;
case 0xAD: /* SHRDv %cl,Gv,Ev */
modrm = getUChar(eip);
eip = dis_SHLRD_Gv_Ev (
cb, eip, modrm, sz, ArchReg, R_CL, False );
break;
/* =-=-=-=-=-=-=-=-=- CMPXCHG -=-=-=-=-=-=-=-=-=-= */
case 0xC1: /* XADD Gv,Ev */
eip = dis_xadd_G_E ( cb, sz, eip );
break;
/* =-=-=-=-=-=-=-=-=- unimp2 =-=-=-=-=-=-=-=-=-=-= */
default:
VG_(printf)("disInstr: unhandled 2-byte opcode 0x%x\n",
(UInt)opc);
VG_(unimplemented)("unhandled x86 0x0F 2-byte opcode");
}
break;
}
/* ------------------------ ??? ------------------------ */
default:
VG_(printf)("disInstr: unhandled opcode 0x%x then 0x%x\n",
(UInt)opc, (UInt)getUChar(eip));
if (opc == 0x8C)
VG_(nvidia_moan)();
VG_(panic)("unhandled x86 opcode");
}
if (dis)
VG_(printf)("\n");
for (; first_uinstr < cb->used; first_uinstr++) {
Bool sane = VG_(saneUInstr)(True, &cb->instrs[first_uinstr]);
if (dis || !sane)
VG_(ppUInstr)(sane ? first_uinstr : -1,
&cb->instrs[first_uinstr]);
vg_assert(sane);
}
return eip;
}
/* Disassemble a complete basic block, starting at eip, and dumping
the ucode into cb. Returns the size, in bytes, of the basic
block. */
Int VG_(disBB) ( UCodeBlock* cb, Addr eip0 )
{
Addr eip = eip0;
Bool isEnd = False;
Bool block_sane;
Int INCEIP_allowed_lag = 4;
Int delta = 0;
if (dis) VG_(printf)("\n");
/* When cache simulating, to ensure cache misses are attributed to the
* correct line we ensure EIP is always correct. This is done by:
*
* a) Using eager INCEIP updating to cope with all instructions except those
* at the end of a basic block.
*
* b) Patching in the size of the original x86 instr in the `extra4b' field
* of JMPs at the end of a basic block. Two cases:
* - Jcond followed by Juncond: patch the Jcond
* - Juncond alone: patch the Juncond
*
* See vg_cachesim_instrument() for how this is used.
*/
if (VG_(clo_cachesim)) {
INCEIP_allowed_lag = 0;
}
if (VG_(clo_single_step)) {
eip = disInstr ( cb, eip, &isEnd );
/* Add a JMP to the next (single x86 instruction) BB if it doesn't
* already end with a JMP instr. We also need to check for no UCode,
* which occurs if the x86 instr was a nop */
if (cb->used == 0 || LAST_UINSTR(cb).opcode != JMP) {
uInstr1(cb, JMP, 0, Literal, 0);
uLiteral(cb, eip);
uCond(cb, CondAlways);
if (dis) VG_(ppUInstr)(cb->used-1, &cb->instrs[cb->used-1]);
}
delta = eip - eip0;
} else {
Addr eip2;
while (!isEnd) {
eip2 = disInstr ( cb, eip, &isEnd );
delta += (eip2 - eip);
eip = eip2;
/* Split up giant basic blocks into pieces, so the
translations fall within 64k. */
if (eip - eip0 > 2000 && !isEnd) {
if (VG_(clo_verbosity) > 2)
VG_(message)(Vg_DebugMsg,
"Warning: splitting giant basic block into pieces");
uInstr1(cb, JMP, 0, Literal, 0);
uLiteral(cb, eip);
uCond(cb, CondAlways);
if (dis) VG_(ppUInstr)(cb->used-1, &cb->instrs[cb->used-1]);
isEnd = True;
} else if (delta > INCEIP_allowed_lag && !isEnd) {
uInstr1(cb, INCEIP, 0, Lit16, delta);
if (dis) VG_(ppUInstr)(cb->used-1, &cb->instrs[cb->used-1]);
delta = 0;
}
if (dis) VG_(printf)("\n");
}
}
if (VG_(clo_cachesim)) {
/* Patch instruction size into earliest JMP. */
if (cb->used >= 2 && JMP == cb->instrs[cb->used - 2].opcode) {
cb->instrs[cb->used - 2].extra4b = delta;
} else {
LAST_UINSTR(cb).extra4b = delta;
}
}
block_sane = VG_(saneUCodeBlock)(cb);
if (!block_sane) {
VG_(ppUCodeBlock)(cb, "block failing sanity check");
vg_assert(block_sane);
}
return eip - eip0;
}
/*--------------------------------------------------------------------*/
/*--- end vg_to_ucode.c ---*/
/*--------------------------------------------------------------------*/