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asm_trampoline.S

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#include "asm_trampoline_aarch64.h"

/* CPython copies this template into executable memory. */

#if defined(__ELF__)

.section .rodata

#else

.text

#endif

.globl _Py_trampoline_func_start

# The following assembly is equivalent to:

# PyObject *

# trampoline(PyThreadState *ts, _PyInterpreterFrame *f,

# int throwflag, py_evaluator evaluator)

# {

# return evaluator(ts, f, throwflag);

# }

_Py_trampoline_func_start:

#ifdef __x86_64__

#if defined(__CET__) && (__CET__ & 1)

endbr64

#endif

push %rbp

mov %rsp, %rbp

call *%rcx

pop %rbp

ret

#endif // __x86_64__

#if defined(__aarch64__) && defined(__AARCH64EL__) && !defined(__ILP32__)

// ARM64 little endian, 64bit ABI

// generate with aarch64-linux-gnu-gcc 12.1

SIGN_LR

stp x29, x30, [sp, -16]!

mov x29, sp

blr x3

ldp x29, x30, [sp], 16

VERIFY_LR

ret

#endif

#ifdef __riscv

addi sp,sp,-16

sd ra,8(sp)

jalr a3

ld ra,8(sp)

addi sp,sp,16

jr ra

#endif

.globl _Py_trampoline_func_end

_Py_trampoline_func_end:

.section .note.GNU-stack,"",@progbits

# Note for indicating the assembly code supports CET

#if defined(__x86_64__) && defined(__CET__) && (__CET__ & 1)

.section .note.gnu.property,"a"

.align 8

.long 1f - 0f

.long 4f - 1f

.long 5

.string "GNU"

.align 8

.long 0xc0000002

.long 3f - 2f

.long 0x3

.align 8

#endif // __x86_64__