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This commit is contained in:
Kartik K. Agaram 2017-10-12 22:17:28 -07:00
parent ea09c91065
commit 763396e533
2 changed files with 25 additions and 2 deletions
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1
subx/010core.cc
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@ -61,6 +61,7 @@ SF = ZF = OF = false;
vector<uint8_t> Mem;
uint32_t End_of_program = 0;
:(before "End Reset")
Mem.clear();
Mem.resize(1024);
End_of_program = 0;

26
subx/011add.cc
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@ -4,7 +4,7 @@
% Reg[3].i = 0x10;
% Reg[0].i = 0x60;
# word in addresses 0x60-0x63 has value 1
% Mem[0x60] = 1;
% Mem.at(0x60) = 1;
# op ModR/M SIB displacement immediate
01 18 # add EBX (reg 3) to *EAX (reg 0)
+run: add reg 3 to effective address
@ -90,9 +90,31 @@ case 3:
:(scenario add_imm32_to_mem_at_r32)
% Reg[3].i = 0x60;
% Mem[0x60] = 1;
% Mem.at(0x60) = 1;
# op ModR/M SIB displacement immediate
81 03 0a 0b 0c 0d # add 0x0d0c0b0a to *EBX (reg 3)
+run: add imm32 0x0d0c0b0a to effective address
+run: effective address is mem at address 0x60 (reg 3)
+run: storing 0x0d0c0b0b
//:
:(scenario add_mem_at_r32_to_r32)
% Reg[0].i = 0x60;
% Reg[3].i = 0x10;
% Mem.at(0x60) = 1;
# op ModR/M SIB displacement immediate
03 18 # add *EAX (reg 0) to EBX (reg 3)
+run: add effective address to reg 3
+run: effective address is mem at address 0x60 (reg 0)
+run: storing 0x00000011
:(before "End Single-Byte Opcodes")
case 0x03: { // add r/m32 to r32
uint8_t modrm = next();
uint8_t arg1 = (modrm>>3)&0x7;
trace(2, "run") << "add effective address to reg " << NUM(arg1) << end();
const int32_t* arg2 = effective_address(modrm);
BINARY_ARITHMETIC_OP(+, Reg[arg1].i, *arg2);
break;
}