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| author | Gabe Black <gblack@eecs.umich.edu> | 2009-04-19 04:14:31 -0700 |
|---|---|---|
| committer | Gabe Black <gblack@eecs.umich.edu> | 2009-04-19 04:14:31 -0700 |
| commit | 5f164ba720f16b93324f54d979bffef15f3c0f25 (patch) | |
| tree | 72fb23035e250c523219c850d2b3d3b2c9c579bf /src/arch/x86/emulenv.cc | |
| parent | 93cccf7d198c8bf6a53481bc34ca9c19b1503196 (diff) | |
| download | gem5-5f164ba720f16b93324f54d979bffef15f3c0f25.tar.xz | |
X86: Actually handle 16 bit mode modrm.
Diffstat (limited to 'src/arch/x86/emulenv.cc')
| -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); |