diff options
| -rw-r--r-- | subx/011add.cc | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/subx/011add.cc b/subx/011add.cc index 82495865..ea6619fc 100644 --- a/subx/011add.cc +++ b/subx/011add.cc @@ -168,3 +168,25 @@ case 5: { +run: effective address is mem at address 0x60 (reg 3) +run: subop subtract +run: storing 0x00000009 + +//: + +:(scenario sub_r32_from_mem_at_r32) +% Reg[0].i = 0x60; +% Mem.at(0x60) = 10; +% Reg[3].i = 1; +# op ModRM SIB displacement immediate + 29 18 # subtract EBX (reg 3) from *EAX (reg 0) ++run: subtract reg 3 from effective address ++run: effective address is mem at address 0x60 (reg 0) ++run: storing 0x00000009 + +:(before "End Single-Byte Opcodes") +case 0x29: { // subtract r32 from r/m32 + uint8_t modrm = next(); + uint8_t arg2 = (modrm>>3)&0x7; + trace(2, "run") << "subtract reg " << NUM(arg2) << " from effective address" << end(); + int32_t* arg1 = effective_address(modrm); + BINARY_ARITHMETIC_OP(-, *arg1, Reg[arg2].i); + break; +} |