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This commit is contained in:
Kartik K. Agaram 2018-01-24 22:58:30 -08:00
parent 0c6c7ff714
commit bc9f26de67
2 changed files with 28 additions and 20 deletions
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46
subx/012indirect_addressing.cc
View File

@ -420,7 +420,7 @@ case 0x8f: { // pop stack into r/m32
+run: effective address is 0x60 (disp32)
+run: storing 0x00000011
:(before "End Mod 0 Special-cases")
:(before "End Mod 0 Special-cases(addr)")
case 5: // exception: mod 0b00 rm 0b101 => incoming disp32
addr = imm32();
trace(2, "run") << "effective address is 0x" << std::hex << addr << " (disp32)" << end();
@ -436,19 +436,22 @@ case 5: // exception: mod 0b00 rm 0b101 => incoming disp32
01 58 02 # add EBX to *(EAX+2)
# ModR/M in binary: 01 (indirect+disp8 mode) 011 (src EBX) 000 (dest EAX)
+run: add EBX to r/m32
+run: effective address is 0x60 (EAX+disp8)
+run: effective address is initially 0x5e (EAX)
+run: effective address is 0x60 (after adding disp8)
+run: storing 0x00000011
:(before "End Mod Special-cases(addr)")
case 1: // indirect + disp8 addressing
switch (rm) {
default: {
int8_t disp = next();
addr = Reg[rm].u + disp;
trace(2, "run") << "effective address is 0x" << std::hex << addr << " (" << rname(rm) << "+disp8)" << end();
break;
}
// End Mod 1 Special-cases(addr)
default:
addr = Reg[rm].u;
trace(2, "run") << "effective address is initially 0x" << std::hex << addr << " (" << rname(rm) << ")" << end();
break;
// End Mod 1 Special-cases(addr)
}
if (addr > 0) {
addr += static_cast<int8_t>(next());
trace(2, "run") << "effective address is 0x" << std::hex << addr << " (after adding disp8)" << end();
}
break;
@ -460,7 +463,8 @@ case 1: // indirect + disp8 addressing
01 58 ff # add EBX to *(EAX-1)
# ModR/M in binary: 01 (indirect+disp8 mode) 011 (src EBX) 000 (dest EAX)
+run: add EBX to r/m32
+run: effective address is 0x60 (EAX+disp8)
+run: effective address is initially 0x61 (EAX)
+run: effective address is 0x60 (after adding disp8)
+run: storing 0x00000011
//:
@ -473,19 +477,22 @@ case 1: // indirect + disp8 addressing
01 98 02 00 00 00 # add EBX to *(EAX+2)
# ModR/M in binary: 10 (indirect+disp32 mode) 011 (src EBX) 000 (dest EAX)
+run: add EBX to r/m32
+run: effective address is 0x60 (EAX+disp32)
+run: effective address is initially 0x5e (EAX)
+run: effective address is 0x60 (after adding disp32)
+run: storing 0x00000011
:(before "End Mod Special-cases(addr)")
case 2: // indirect + disp32 addressing
switch (rm) {
default: {
int32_t disp = imm32();
addr = Reg[rm].u + disp;
trace(2, "run") << "effective address is 0x" << std::hex << addr << " (" << rname(rm) << "+disp32)" << end();
break;
}
// End Mod 2 Special-cases(addr)
default:
addr = Reg[rm].u;
trace(2, "run") << "effective address is initially 0x" << std::hex << addr << " (" << rname(rm) << ")" << end();
break;
// End Mod 2 Special-cases(addr)
}
if (addr > 0) {
addr += imm32();
trace(2, "run") << "effective address is 0x" << std::hex << addr << " (after adding disp32)" << end();
}
break;
@ -497,5 +504,6 @@ case 2: // indirect + disp32 addressing
01 98 ff ff ff ff # add EBX to *(EAX-1)
# ModR/M in binary: 10 (indirect+disp32 mode) 011 (src EBX) 000 (dest EAX)
+run: add EBX to r/m32
+run: effective address is 0x60 (EAX+disp32)
+run: effective address is initially 0x61 (EAX)
+run: effective address is 0x60 (after adding disp32)
+run: storing 0x00000011

2
subx/014index_addressing.cc
View File

@ -13,7 +13,7 @@
+run: effective address is 0x60
+run: storing 0x00000011
:(before "End Mod 0 Special-cases")
:(before "End Mod 0 Special-cases(addr)")
case 4: // exception: mod 0b00 rm 0b100 => incoming SIB (scale-index-base) byte
addr = effective_address_from_sib(mod);
break;