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LibJS/JIT: Do "enter & leave" sequence in x86_64 machine code

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This ensures that the stack pointer is restored before we return from
the jitted code.
This commit is contained in:
Andreas Kling 2023-10-17 18:03:39 +02:00
parent 814b07a9c2
commit 71e41418f6
2 changed files with 12 additions and 0 deletions
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10
Userland/Libraries/LibJS/JIT/Assembler.h
View file

@ -290,8 +290,18 @@ struct Assembler {
} }
} }
void enter()
{
push(Operand::Register(Reg::RBP));
mov(Operand::Register(Reg::RBP), Operand::Register(Reg::RSP));
sub(Operand::Register(Reg::RSP), Operand::Imm8(8));
}
void exit() void exit()
{ {
// leave
emit8(0xc9);
// ret // ret
emit8(0xc3); emit8(0xc3);
} }

2
Userland/Libraries/LibJS/JIT/Compiler.cpp
View file

@ -179,6 +179,8 @@ OwnPtr<NativeExecutable> Compiler::compile(Bytecode::Executable const& bytecode_
Compiler compiler; Compiler compiler;
compiler.m_assembler.enter();
compiler.m_assembler.mov( compiler.m_assembler.mov(
Assembler::Operand::Register(REGISTER_ARRAY_BASE), Assembler::Operand::Register(REGISTER_ARRAY_BASE),
Assembler::Operand::Register(ARG1)); Assembler::Operand::Register(ARG1));