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LibJS/JIT: Save and restore callee-saved registers in jitted code

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This commit is contained in:
Andreas Kling 2023-10-20 13:04:51 +02:00
parent 3974ce2069
commit decc221109
1 changed files with 27 additions and 0 deletions
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27
Userland/Libraries/LibJS/JIT/Assembler.h
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@ -311,6 +311,8 @@ struct Assembler {
void enter() void enter()
{ {
push_callee_saved_registers();
push(Operand::Register(Reg::RBP)); push(Operand::Register(Reg::RBP));
mov(Operand::Register(Reg::RBP), Operand::Register(Reg::RSP)); mov(Operand::Register(Reg::RBP), Operand::Register(Reg::RSP));
sub(Operand::Register(Reg::RSP), Operand::Imm8(8)); sub(Operand::Register(Reg::RSP), Operand::Imm8(8));
@ -321,10 +323,35 @@ struct Assembler {
// leave // leave
emit8(0xc9); emit8(0xc9);
pop_callee_saved_registers();
// ret // ret
emit8(0xc3); emit8(0xc3);
} }
void push_callee_saved_registers()
{
// FIXME: Don't push RBX twice :^)
push(Operand::Register(Reg::RBX));
push(Operand::Register(Reg::RBX));
push(Operand::Register(Reg::R12));
push(Operand::Register(Reg::R13));
push(Operand::Register(Reg::R14));
push(Operand::Register(Reg::R15));
}
void pop_callee_saved_registers()
{
pop(Operand::Register(Reg::R15));
pop(Operand::Register(Reg::R14));
pop(Operand::Register(Reg::R13));
pop(Operand::Register(Reg::R12));
// FIXME: Don't pop RBX twice :^)
pop(Operand::Register(Reg::RBX));
pop(Operand::Register(Reg::RBX));
}
void push(Operand op) void push(Operand op)
{ {
if (op.type == Operand::Type::Reg) { if (op.type == Operand::Type::Reg) {