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[3.14] gh-136541: Fix several problems of perf trampolines in x86_64 and aarch64 (GH-136500) (#136544)

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gh-136541: Fix several problems of perf trampolines in x86_64 and aarch64 (GH-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
(cherry picked from commit 236f733d8f)

Co-authored-by: Pablo Galindo Salgado <Pablogsal@gmail.com>
This commit is contained in:
Miss Islington (bot) 2025-07-11 16:06:19 +02:00 • committed by GitHub
parent a464c4e2e8
commit 5535482d2a
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4 changed files with 147 additions and 41 deletions
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7
Python/asm_trampoline.S
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@ -12,9 +12,10 @@ _Py_trampoline_func_start:
#if defined(__CET__) && (__CET__ & 1)
endbr64
#endif
sub $8, %rsp
call *%rcx
add $8, %rsp
push %rbp
mov %rsp, %rbp
call *%rcx
pop %rbp
ret
#endif // __x86_64__
#if defined(__aarch64__) && defined(__AARCH64EL__) && !defined(__ILP32__)