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LibJS+LibJIT: Let users of JIT::Assembler handle caller-saved registers

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Instead of JIT::Assembler making the decision for everyone and forcing
out every caller-saved register in the ABI onto the stack, we now leave
that decision to users of JIT::Assembler.
This commit is contained in:
Andreas Kling 2023-10-28 14:22:07 +02:00
parent 9afd12a8ba
commit 926786e8d1
3 changed files with 55 additions and 47 deletions
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22
Userland/Libraries/LibJIT/Assembler.h
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@ -564,19 +564,9 @@ struct Assembler {
}
}
// NOTE: It's up to the caller of this function to preserve registers as needed.
void native_call(void* callee, Vector<Operand> const& stack_arguments = {})
{
// push caller-saved registers on the stack
// (callee-saved registers: RBX, RSP, RBP, and R12–R15)
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));
// Preserve 16-byte stack alignment for non-even amount of stack-passed arguments
if ((stack_arguments.size() % 2) == 1)
push(Operand::Imm(0));
@ -592,16 +582,6 @@ struct Assembler {
if (!stack_arguments.is_empty())
add(Operand::Register(Reg::RSP), Operand::Imm(align_up_to(stack_arguments.size(), 2) * sizeof(void*)));
// restore caller-saved registers from the stack
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));
}
void trap()