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Kartik K. Agaram 2017-10-12 23:01:57 -07:00
parent d98c813870
commit 293dd258ff
1 changed files with 22 additions and 0 deletions
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subx/011add.cc
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@ -190,3 +190,25 @@ case 0x29: { // subtract r32 from r/m32
BINARY_ARITHMETIC_OP(-, *arg1, Reg[arg2].i);
break;
}
//:
:(scenario sub_mem_at_r32_from_r32)
% Reg[0].i = 0x60;
% Mem.at(0x60) = 1;
% Reg[3].i = 10;
# op ModRM SIB displacement immediate
2b 18 # subtract *EAX (reg 0) from EBX (reg 3)
+run: subtract effective address from reg 3
+run: effective address is mem at address 0x60 (reg 0)
+run: storing 0x00000009
:(before "End Single-Byte Opcodes")
case 0x2b: { // subtract r/m32 from r32
uint8_t modrm = next();
uint8_t arg1 = (modrm>>3)&0x7;
trace(2, "run") << "subtract effective address from reg " << NUM(arg1) << end();
const int32_t* arg2 = effective_address(modrm);
BINARY_ARITHMETIC_OP(-, Reg[arg1].i, *arg2);
break;
}