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X86: Actually handle 16 bit mode modrm.

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This commit is contained in:
Gabe Black 2009-04-19 04:14:31 -07:00
parent 93cccf7d19
commit 5f164ba720
1 changed files with 26 additions and 1 deletions
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27
src/arch/x86/emulenv.cc
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@ -79,7 +79,32 @@ void EmulEnv::doModRM(const ExtMachInst & machInst)
index = NUM_INTREGS;
} else {
if (machInst.addrSize == 2) {
warn("I'm not really using 16 bit MODRM like I'm supposed to!\n");
unsigned rm = machInst.modRM.rm;
if (rm <= 3) {
scale = 1;
if (rm < 2) {
base = INTREG_RBX;
} else {
base = INTREG_RBP;
}
index = (rm % 2) ? INTREG_RDI : INTREG_RSI;
} else {
scale = 0;
switch (rm) {
case 4:
base = INTREG_RSI;
break;
case 5:
base = INTREG_RDI;
break;
case 6:
base = INTREG_RBP;
break;
case 7:
base = INTREG_RBX;
break;
}
}
} else {
scale = 0;
base = machInst.modRM.rm | (machInst.rex.b << 3);