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author | Kartik K. Agaram <vc@akkartik.com> | 2017-10-13 01:13:33 -0700 |
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committer | Kartik K. Agaram <vc@akkartik.com> | 2017-10-13 01:13:33 -0700 |
commit | 8745e7456a4a14e0c0220fe8c6a5f988fdd39a29 (patch) | |
tree | 23fab7b98a1d50e455e89da0634806958c84fd7e /subx/012indirect_addressing.cc | |
parent | ce315187881b625354ab3279f470a3e771e61525 (diff) | |
download | mu-8745e7456a4a14e0c0220fe8c6a5f988fdd39a29.tar.gz |
4057
Diffstat (limited to 'subx/012indirect_addressing.cc')
-rw-r--r-- | subx/012indirect_addressing.cc | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/subx/012indirect_addressing.cc b/subx/012indirect_addressing.cc index 4cc3cb9d..3c3fae3c 100644 --- a/subx/012indirect_addressing.cc +++ b/subx/012indirect_addressing.cc @@ -156,3 +156,43 @@ case 0x0b: { // or r/m32 with r32 BINARY_BITWISE_OP(|, Reg[arg1].u, *arg2); break; } + +//:: xor + +:(scenario xor_r32_with_mem_at_r32) +% Reg[0].i = 0x60; +% Mem.at(0x60) = 0x0d; +% Mem.at(0x61) = 0x0c; +% Mem.at(0x62) = 0xbb; +% Mem.at(0x63) = 0xaa; +% Reg[3].i = 0xa0b0c0d0; +# op ModRM SIB displacement immediate + 31 18 # xor EBX (reg 3) with *EAX (reg 0) ++run: xor reg 3 with effective address ++run: effective address is mem at address 0x60 (reg 0) ++run: storing 0x0a0bccdd + +//: + +:(scenario xor_mem_at_r32_with_r32) +% Reg[0].i = 0x60; +% Mem.at(0x60) = 0x0d; +% Mem.at(0x61) = 0x0c; +% Mem.at(0x62) = 0x0b; +% Mem.at(0x63) = 0x0a; +% Reg[3].i = 0xa0b0c0d0; +# op ModRM SIB displacement immediate + 33 18 # xor *EAX (reg 0) with EBX (reg 3) ++run: xor effective address with reg 3 ++run: effective address is mem at address 0x60 (reg 0) ++run: storing 0xaabbccdd + +:(before "End Single-Byte Opcodes") +case 0x33: { // xor r/m32 with r32 + uint8_t modrm = next(); + uint8_t arg1 = (modrm>>3)&0x7; + trace(2, "run") << "xor effective address with reg " << NUM(arg1) << end(); + const int32_t* arg2 = effective_address(modrm); + BINARY_BITWISE_OP(|, Reg[arg1].u, *arg2); + break; +} |