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From: <sv...@va...> - 2006-11-16 10:42:10
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Author: sewardj
Date: 2006-11-16 10:42:02 +0000 (Thu, 16 Nov 2006)
New Revision: 1678
Log:
Handle JCXZ.
Modified:
trunk/priv/guest-x86/toIR.c
Modified: trunk/priv/guest-x86/toIR.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- trunk/priv/guest-x86/toIR.c 2006-11-15 02:57:05 UTC (rev 1677)
+++ trunk/priv/guest-x86/toIR.c 2006-11-16 10:42:02 UTC (rev 1678)
@@ -10827,6 +10827,28 @@
=20
after_sse_decoders:
=20
+ /* ---------------------------------------------------- */
+ /* --- deal with misc 0x67 pfxs (addr size override) -- */
+ /* ---------------------------------------------------- */
+
+ /* 67 E3 =3D JCXZ (for JECXZ see below) */
+ if (insn[0] =3D=3D 0x67 && insn[1] =3D=3D 0xE3 && sz =3D=3D 4) {
+ delta +=3D 2;
+ d32 =3D (((Addr32)guest_EIP_bbstart)+delta+1) + getSDisp8(delta);
+ delta ++;
+ stmt( IRStmt_Exit(
+ binop(Iop_CmpEQ16, getIReg(2,R_ECX), mkU16(0)),
+ Ijk_Boring,
+ IRConst_U32(d32)
+ ));
+ DIP("jcxz 0x%x\n", d32);
+ goto decode_success;
+ }
+
+ /* ---------------------------------------------------- */
+ /* --- start of the baseline insn decoder -- */
+ /* ---------------------------------------------------- */
+
/* Get the primary opcode. */
opc =3D getIByte(delta); delta++;
=20
@@ -11157,21 +11179,16 @@
DIP("j%s-8 0x%x\n", name_X86Condcode(opc - 0x70), d32);
break;
=20
- case 0xE3: /* JECXZ or perhaps JCXZ, depending on OSO ? Intel
- manual says it depends on address size override. */
+ case 0xE3: /* JECXZ (for JCXZ see above) */
if (sz !=3D 4) goto decode_failure;
d32 =3D (((Addr32)guest_EIP_bbstart)+delta+1) + getSDisp8(delta);
- delta++;
- ty =3D szToITy(sz);
+ delta ++;
stmt( IRStmt_Exit(
- binop(mkSizedOp(ty,Iop_CmpEQ8),
- getIReg(sz,R_ECX),
- mkU(ty,0)),
+ binop(Iop_CmpEQ32, getIReg(4,R_ECX), mkU32(0)),
Ijk_Boring,
- IRConst_U32(d32))=20
- );
-
- DIP("j%sz 0x%x\n", nameIReg(sz, R_ECX), d32);
+ IRConst_U32(d32)
+ ));
+ DIP("jecxz 0x%x\n", d32);
break;
=20
case 0xE0: /* LOOPNE disp8: decrement count, jump if count !=3D 0 && =
ZF=3D=3D0 */
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