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LibJS/JIT: Add Assembler::add() and sub() helpers

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This commit is contained in:
Andreas Kling 2023-10-16 15:32:13 +02:00
parent 10dcb4d53a
commit e7ce3d271a
1 changed files with 48 additions and 8 deletions
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56
Userland/Libraries/LibJS/JIT/Assembler.h
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@ -334,6 +334,52 @@ struct Assembler {
}
}
void add(Operand dst, Operand src)
{
if (dst.type == Operand::Type::Reg && src.type == Operand::Type::Reg) {
emit8(0x48
| ((to_underlying(dst.reg) >= 8) ? 1 << 2 : 0)
| ((to_underlying(src.reg) >= 8) ? 1 << 0 : 0));
emit8(0x01);
emit8(0xc0 | (encode_reg(dst.reg) << 3) | encode_reg(src.reg));
} else if (dst.type == Operand::Type::Reg && src.type == Operand::Type::Imm32) {
emit8(0x48 | ((to_underlying(dst.reg) >= 8) ? 1 << 0 : 0));
emit8(0x81);
emit8(0xc0 | encode_reg(dst.reg));
emit32(src.offset_or_immediate);
} else if (dst.type == Operand::Type::Reg && src.type == Operand::Type::Imm8) {
emit8(0x48 | ((to_underlying(dst.reg) >= 8) ? 1 << 0 : 0));
emit8(0x83);
emit8(0xc0 | encode_reg(dst.reg));
emit8(src.offset_or_immediate);
} else {
VERIFY_NOT_REACHED();
}
}
void sub(Operand dst, Operand src)
{
if (dst.type == Operand::Type::Reg && src.type == Operand::Type::Reg) {
emit8(0x48
| ((to_underlying(dst.reg) >= 8) ? 1 << 2 : 0)
| ((to_underlying(src.reg) >= 8) ? 1 << 0 : 0));
emit8(0x29);
emit8(0xc0 | (encode_reg(dst.reg) << 3) | encode_reg(src.reg));
} else if (dst.type == Operand::Type::Reg && src.type == Operand::Type::Imm32) {
emit8(0x48 | ((to_underlying(dst.reg) >= 8) ? 1 << 0 : 0));
emit8(0x81);
emit8(0xe8 | encode_reg(dst.reg));
emit32(src.offset_or_immediate);
} else if (dst.type == Operand::Type::Reg && src.type == Operand::Type::Imm8) {
emit8(0x48 | ((to_underlying(dst.reg) >= 8) ? 1 << 0 : 0));
emit8(0x83);
emit8(0xe8 | encode_reg(dst.reg));
emit8(src.offset_or_immediate);
} else {
VERIFY_NOT_REACHED();
}
}
void native_call(void* callee)
{
// push caller-saved registers on the stack
@ -348,10 +394,7 @@ struct Assembler {
push(Operand::Register(Reg::R11));
// align the stack to 16-byte boundary
emit8(0x48);
emit8(0x83);
emit8(0xec);
emit8(0x08);
sub(Operand::Register(Reg::RSP), Operand::Imm8(8));
// load callee into RAX and make indirect call
emit8(0x48);
@ -361,10 +404,7 @@ struct Assembler {
emit8(0xd0);
// adjust stack pointer
emit8(0x48);
emit8(0x83);
emit8(0xc4);
emit8(0x08);
add(Operand::Register(Reg::RSP), Operand::Imm8(8));
// restore caller-saved registers from the stack
pop(Operand::Register(Reg::R11));