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LibJIT: Support passing stack arguments to native_call()s

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The x86-64 SystemV ABI specifies that additional arguments after the
first 6 register-passed ones should be passed on the stack.
This commit is contained in:
Idan Horowitz 2023-10-28 15:17:47 +03:00 • committed by Andreas Kling
parent e63423554f
commit 863314ff10
1 changed files with 10 additions and 1 deletions
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11
Userland/Libraries/LibJIT/Assembler.h
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@ -564,7 +564,7 @@ struct Assembler {
}
}
void native_call(void* callee)
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)
@ -577,6 +577,12 @@ struct Assembler {
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));
for (auto const& stack_argument : stack_arguments.in_reverse())
push(stack_argument);
// load callee into RAX
mov(Operand::Register(Reg::RAX), Operand::Imm(bit_cast<u64>(callee)));
@ -584,6 +590,9 @@ struct Assembler {
emit8(0xff);
emit8(0xd0);
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));