diff options
| -rw-r--r-- | src/arch/x86/emulenv.cc | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/src/arch/x86/emulenv.cc b/src/arch/x86/emulenv.cc index 0d7b32130..8e4600a14 100644 --- a/src/arch/x86/emulenv.cc +++ b/src/arch/x86/emulenv.cc @@ -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); |