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cpython/Python/asm_trampoline.S

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gh-96143: Allow Linux perf profiler to see Python calls (GH-96123) :warning: :warning: Note for reviewers, hackers and fellow systems/low-level/compiler engineers :warning: :warning: If you have a lot of experience with this kind of shenanigans and want to improve the **first** version, **please make a PR against my branch** or **reach out by email** or **suggest code changes directly on GitHub**. If you have any **refinements or optimizations** please, wait until the first version is merged before starting hacking or proposing those so we can keep this PR productive.
2022-08-30 18:11:18 +01:00
.text
gh-136459: Add perf trampoline support for macOS (#136461)
2025-07-22 17:47:24 +02:00
#if defined(__APPLE__)
.globl __Py_trampoline_func_start
#else
gh-96143: Allow Linux perf profiler to see Python calls (GH-96123) :warning: :warning: Note for reviewers, hackers and fellow systems/low-level/compiler engineers :warning: :warning: If you have a lot of experience with this kind of shenanigans and want to improve the **first** version, **please make a PR against my branch** or **reach out by email** or **suggest code changes directly on GitHub**. If you have any **refinements or optimizations** please, wait until the first version is merged before starting hacking or proposing those so we can keep this PR productive.
2022-08-30 18:11:18 +01:00
.globl _Py_trampoline_func_start
gh-136459: Add perf trampoline support for macOS (#136461)
2025-07-22 17:47:24 +02:00
#endif
gh-96143: Allow Linux perf profiler to see Python calls (GH-96123) :warning: :warning: Note for reviewers, hackers and fellow systems/low-level/compiler engineers :warning: :warning: If you have a lot of experience with this kind of shenanigans and want to improve the **first** version, **please make a PR against my branch** or **reach out by email** or **suggest code changes directly on GitHub**. If you have any **refinements or optimizations** please, wait until the first version is merged before starting hacking or proposing those so we can keep this PR productive.
2022-08-30 18:11:18 +01:00
# The following assembly is equivalent to:
# PyObject *
# trampoline(PyThreadState *ts, _PyInterpreterFrame *f,
# int throwflag, py_evaluator evaluator)
# {
# return evaluator(ts, f, throwflag);
# }
gh-136459: Add perf trampoline support for macOS (#136461)
2025-07-22 17:47:24 +02:00
#if defined(__APPLE__)
__Py_trampoline_func_start:
#else
gh-96143: Allow Linux perf profiler to see Python calls (GH-96123) :warning: :warning: Note for reviewers, hackers and fellow systems/low-level/compiler engineers :warning: :warning: If you have a lot of experience with this kind of shenanigans and want to improve the **first** version, **please make a PR against my branch** or **reach out by email** or **suggest code changes directly on GitHub**. If you have any **refinements or optimizations** please, wait until the first version is merged before starting hacking or proposing those so we can keep this PR productive.
2022-08-30 18:11:18 +01:00
_Py_trampoline_func_start:
gh-136459: Add perf trampoline support for macOS (#136461)
2025-07-22 17:47:24 +02:00
#endif
gh-96143: Allow Linux perf profiler to see Python calls (GH-96123) :warning: :warning: Note for reviewers, hackers and fellow systems/low-level/compiler engineers :warning: :warning: If you have a lot of experience with this kind of shenanigans and want to improve the **first** version, **please make a PR against my branch** or **reach out by email** or **suggest code changes directly on GitHub**. If you have any **refinements or optimizations** please, wait until the first version is merged before starting hacking or proposing those so we can keep this PR productive.
2022-08-30 18:11:18 +01:00
#ifdef __x86_64__
gh-128605: Add branch protections for x86_64 in asm_trampoline.S (#128606) Apply Intel Control-flow Technology for x86-64 on asm_trampoline.S. Required for mitigation against return-oriented programming (ROP) and Call or Jump Oriented Programming (COP/JOP) attacks. Manual application is required for the assembly files. See also: https://sourceware.org/annobin/annobin.html/Test-cf-protection.html
2025-06-03 09:09:43 +02:00
#if defined(__CET__) && (__CET__ & 1)
endbr64
#endif
gh-136541: Fix several problems of perf trampolines in x86_64 and aarch64 (#136500) This commit fixes the following problems: * The x86_64 trampolines are not preserving frame pointers * The hardcoded offsets to the code segment from the FDE only worked properly for x64_64 * The CIE data was not following conventions of aarch64 * The eh_frame for aarch64 was not fully correct
2025-07-11 14:32:35 +01:00
push %rbp
mov %rsp, %rbp
call *%rcx
pop %rbp
gh-96143: Allow Linux perf profiler to see Python calls (GH-96123) :warning: :warning: Note for reviewers, hackers and fellow systems/low-level/compiler engineers :warning: :warning: If you have a lot of experience with this kind of shenanigans and want to improve the **first** version, **please make a PR against my branch** or **reach out by email** or **suggest code changes directly on GitHub**. If you have any **refinements or optimizations** please, wait until the first version is merged before starting hacking or proposing those so we can keep this PR productive.
2022-08-30 18:11:18 +01:00
ret
#endif // __x86_64__
#if defined(__aarch64__) && defined(__AARCH64EL__) && !defined(__ILP32__)
// ARM64 little endian, 64bit ABI
// generate with aarch64-linux-gnu-gcc 12.1
stp x29, x30, [sp, -16]!
mov x29, sp
blr x3
ldp x29, x30, [sp], 16
ret
gh-120400 ：Support Linux perf profile to see Python calls on RISC-V architecture (#120089) Co-authored-by: Pablo Galindo Salgado <Pablogsal@gmail.com>
2024-06-12 21:24:46 +08:00
#endif
#ifdef __riscv
addi sp,sp,-16
sd ra,8(sp)
jalr a3
ld ra,8(sp)
addi sp,sp,16
jr ra
gh-96143: Allow Linux perf profiler to see Python calls (GH-96123) :warning: :warning: Note for reviewers, hackers and fellow systems/low-level/compiler engineers :warning: :warning: If you have a lot of experience with this kind of shenanigans and want to improve the **first** version, **please make a PR against my branch** or **reach out by email** or **suggest code changes directly on GitHub**. If you have any **refinements or optimizations** please, wait until the first version is merged before starting hacking or proposing those so we can keep this PR productive.
2022-08-30 18:11:18 +01:00
#endif
gh-136459: Add perf trampoline support for macOS (#136461)
2025-07-22 17:47:24 +02:00
#if defined(__APPLE__)
.globl __Py_trampoline_func_end
__Py_trampoline_func_end:
#else
gh-96143: Allow Linux perf profiler to see Python calls (GH-96123) :warning: :warning: Note for reviewers, hackers and fellow systems/low-level/compiler engineers :warning: :warning: If you have a lot of experience with this kind of shenanigans and want to improve the **first** version, **please make a PR against my branch** or **reach out by email** or **suggest code changes directly on GitHub**. If you have any **refinements or optimizations** please, wait until the first version is merged before starting hacking or proposing those so we can keep this PR productive.
2022-08-30 18:11:18 +01:00
.globl _Py_trampoline_func_end
_Py_trampoline_func_end:
.section .note.GNU-stack,"",@progbits
gh-136459: Add perf trampoline support for macOS (#136461)
2025-07-22 17:47:24 +02:00
#endif
gh-128605: Add branch protections for x86_64 in asm_trampoline.S (#128606) Apply Intel Control-flow Technology for x86-64 on asm_trampoline.S. Required for mitigation against return-oriented programming (ROP) and Call or Jump Oriented Programming (COP/JOP) attacks. Manual application is required for the assembly files. See also: https://sourceware.org/annobin/annobin.html/Test-cf-protection.html
2025-06-03 09:09:43 +02:00
# 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
0:
.string "GNU"
1:
.align 8
.long 0xc0000002
.long 3f - 2f
2:
.long 0x3
3:
.align 8
4:
#endif // __x86_64__
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