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This commit is contained in:
Kartik Agaram 2018-10-12 23:27:26 -07:00
parent 544fbdc6e2
commit 01dada15c3
2 changed files with 19 additions and 19 deletions
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22
subx/014indirect_addressing.cc
View File

@ -374,11 +374,11 @@ af 00 00 00 # 0xaf
:(before "End Single-Byte Opcodes")
case 0x8b: { // copy r32 to r/m32
uint8_t modrm = next();
uint8_t reg1 = (modrm>>3)&0x7;
trace(90, "run") << "copy r/m32 to " << rname(reg1) << end();
int32_t* arg2 = effective_address(modrm);
Reg[reg1].i = *arg2;
trace(90, "run") << "storing 0x" << HEXWORD << *arg2 << end();
uint8_t rdest = (modrm>>3)&0x7;
trace(90, "run") << "copy r/m32 to " << rname(rdest) << end();
int32_t* src = effective_address(modrm);
Reg[rdest].i = *src;
trace(90, "run") << "storing 0x" << HEXWORD << *src << end();
break;
}
@ -436,13 +436,13 @@ ab ff ff ff # 0xab with more data in following bytes
:(before "End Single-Byte Opcodes")
case 0x8a: { // copy r/m8 to r8
uint8_t modrm = next();
uint8_t reg1 = (modrm>>3)&0x7;
trace(90, "run") << "copy r8/m8-at-r32 to lowermost byte of " << rname(reg1) << end();
uint8_t rdest = (modrm>>3)&0x7;
trace(90, "run") << "copy r8/m8-at-r32 to lowermost byte of " << rname(rdest) << end();
// use unsigned to zero-extend 8-bit value to 32 bits
uint8_t* arg2 = reinterpret_cast<uint8_t*>(effective_address(modrm));
trace(90, "run") << "storing 0x" << HEXBYTE << NUM(*arg2) << end();
*reinterpret_cast<uint8_t*>(&Reg[reg1].u) = *arg2; // assumes host is little-endian
trace(90, "run") << rname(reg1) << " now contains 0x" << HEXWORD << Reg[reg1].u << end();
uint8_t* src = reinterpret_cast<uint8_t*>(effective_address(modrm));
trace(90, "run") << "storing 0x" << HEXBYTE << NUM(*src) << end();
*reinterpret_cast<uint8_t*>(&Reg[rdest].u) = *src; // assumes host is little-endian
trace(90, "run") << rname(rdest) << " now contains 0x" << HEXWORD << Reg[rdest].u << end();
break;
}

16
subx/015immediate_addressing.cc
View File

@ -437,10 +437,10 @@ case 0xbc:
case 0xbd:
case 0xbe:
case 0xbf: { // copy imm32 to r32
uint8_t reg1 = op & 0x7;
int32_t arg2 = next32();
trace(90, "run") << "copy imm32 0x" << HEXWORD << arg2 << " to " << rname(reg1) << end();
Reg[reg1].i = arg2;
uint8_t rdest = op & 0x7;
int32_t src = next32();
trace(90, "run") << "copy imm32 0x" << HEXWORD << src << " to " << rname(rdest) << end();
Reg[rdest].i = src;
break;
}
@ -463,10 +463,10 @@ put(name, "c7", "copy imm32 to rm32");
case 0xc7: { // copy imm32 to r32
uint8_t modrm = next();
trace(90, "run") << "copy imm32 to r/m32" << end();
int32_t* arg1 = effective_address(modrm);
int32_t arg2 = next32();
trace(90, "run") << "imm32 is 0x" << HEXWORD << arg2 << end();
*arg1 = arg2;
int32_t* dest = effective_address(modrm);
int32_t src = next32();
trace(90, "run") << "imm32 is 0x" << HEXWORD << src << end();
*dest = src;
break;
}