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LibJS/JIT: Add Assembler::push() and pop() helpers

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This commit is contained in:
Andreas Kling 2023-10-16 15:27:06 +02:00
parent acece9057e
commit 10dcb4d53a
Notes: sideshowbarker 2024-07-17 04:10:16 +09:00
1 changed files with 38 additions and 27 deletions
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65
Userland/Libraries/LibJS/JIT/Assembler.h
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@ -312,24 +312,40 @@ struct Assembler {
emit8(0xc3);
}
void push(Operand op)
{
if (op.type == Operand::Type::Reg) {
if (to_underlying(op.reg) >= 8)
emit8(0x49);
emit8(0x50 | encode_reg(op.reg));
} else {
VERIFY_NOT_REACHED();
}
}
void pop(Operand op)
{
if (op.type == Operand::Type::Reg) {
if (to_underlying(op.reg) >= 8)
emit8(0x49);
emit8(0x58 | encode_reg(op.reg));
} else {
VERIFY_NOT_REACHED();
}
}
void native_call(void* callee)
{
// push caller-saved registers on the stack
// (callee-saved registers: RBX, RSP, RBP, and R12–R15)
// push RCX, RDX, RSI, RDI, R8, R9, R10, R11
emit8(0x51);
emit8(0x52);
emit8(0x56);
emit8(0x57);
emit8(0x41);
emit8(0x50);
emit8(0x41);
emit8(0x51);
emit8(0x41);
emit8(0x52);
emit8(0x41);
emit8(0x53);
push(Operand::Register(Reg::RCX));
push(Operand::Register(Reg::RDX));
push(Operand::Register(Reg::RSI));
push(Operand::Register(Reg::RDI));
push(Operand::Register(Reg::R8));
push(Operand::Register(Reg::R9));
push(Operand::Register(Reg::R10));
push(Operand::Register(Reg::R11));
// align the stack to 16-byte boundary
emit8(0x48);
@ -351,19 +367,14 @@ struct Assembler {
emit8(0x08);
// restore caller-saved registers from the stack
// pop R11, R10, R9, R8, RDI, RSI, RDX, RCX
emit8(0x41);
emit8(0x5b);
emit8(0x41);
emit8(0x5a);
emit8(0x41);
emit8(0x59);
emit8(0x41);
emit8(0x58);
emit8(0x5f);
emit8(0x5e);
emit8(0x5a);
emit8(0x59);
pop(Operand::Register(Reg::R11));
pop(Operand::Register(Reg::R10));
pop(Operand::Register(Reg::R9));
pop(Operand::Register(Reg::R8));
pop(Operand::Register(Reg::RDI));
pop(Operand::Register(Reg::RSI));
pop(Operand::Register(Reg::RDX));
pop(Operand::Register(Reg::RCX));
}
};