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Merge pull request #2790 from cimarronm/lea-invalid-opcode

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Dynamic Cores - Invalid LEA instruction
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Jonathan Campbell 2021-08-12 22:26:57 -06:00 committed by GitHub
commit 4df9156d28
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6 changed files with 11 additions and 5 deletions
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1
src/cpu/core_dyn_x86/decoder.h
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@ -2783,6 +2783,7 @@ restart_prefix:
/* LEA Gv */
case 0x8d:
dyn_get_modrm();
if (GCC_UNLIKELY(decode.modrm.mod==3)) goto illegalopcode; // Direct register causes #UD exception
if (decode.big_op) {
dyn_fill_ea(false,&DynRegs[decode.modrm.reg]);
} else {

6
src/cpu/core_dynrec/decoder.h
View File

@ -329,7 +329,11 @@ restart_prefix:
case 0x8c:dyn_mov_ev_seg();break;
// load effective address
case 0x8d:dyn_lea();break;
case 0x8d:
dyn_get_modrm();
if (GCC_UNLIKELY(decode.modrm.mod==3)) goto illegalopcode; // Direct register causes #UD exception
dyn_lea();
break;
// move a value from memory or a 16bit register into a segment register
case 0x8e:dyn_mov_seg_ev();break;

1
src/cpu/core_dynrec/decoder_opcodes.h
View File

@ -396,7 +396,6 @@ static void dyn_mov_ev_seg(void) {
static void dyn_lea(void) {
dyn_get_modrm();
dyn_fill_ea(FC_ADDR,false);
MOV_REG_WORD_FROM_HOST_REG(FC_ADDR,decode.modrm.reg,decode.big_op);
}

1
src/cpu/core_full/load.h
View File

@ -175,6 +175,7 @@ l_M_Ed:
inst_op2_d=LoadMw(inst.rm_eaa+4);
break;
case M_EA:
if (inst.rm>=0xc0) goto illegalopcode;
inst_op1_d=inst.rm_off;
break;
case M_POPw:

3
src/cpu/core_normal/prefix_66.h
View File

@ -358,8 +358,9 @@
}
CASE_D(0x8d) /* LEA Gd */
{
//Little hack to always use segprefixed version
GetRMrd;
if (rm >= 0xc0) goto illegal_opcode;
//Little hack to always use segprefixed version
BaseDS=BaseSS=0;
if (TEST_PREFIX_ADDR) {
*rmrd=(uint32_t)(*EATable[256+rm])();

4
src/cpu/core_normal/prefix_none.h
View File

@ -541,10 +541,10 @@
}
CASE_W(0x8d) /* LEA Gw */
{
//Little hack to always use segprefixed version
BaseDS=BaseSS=0;
GetRMrw;
if (rm >= 0xc0) goto illegal_opcode; // Direct register causes #UD exception
//Little hack to always use segprefixed version
BaseDS=BaseSS=0;
if (TEST_PREFIX_ADDR) {
*rmrw=(uint16_t)(*EATable[256+rm])();
} else {