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[3.15] gh-152240: Fix test_c_stack_unwind on Linux LoongArch builds (GH-152241) #152578

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[3.15] gh-152240: Fix test_c_stack_unwind on Linux LoongArch builds (GH-152241) #152578

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Build/2026-06-26-16-30-00.gh-issue-152240.loongarch.rst
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@StanFromIreland StanFromIreland Jul 1, 2026

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This is in the wrong directory! It should be in Test, but we don't really need it at all.

Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix C stack unwinding tests on Linux LoongArch builds by teaching the manual
frame pointer unwinder to recognize the LoongArch frame layout.
6 changes: 6 additions & 0 deletions Modules/_testinternalcapi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -98,6 +98,12 @@ static const uintptr_t min_frame_pointer_addr = 0x1000;
// https://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html#STACK
# define FRAME_POINTER_NEXT_OFFSET 0
# define FRAME_POINTER_RETURN_OFFSET 2
#elif defined(__loongarch__)
// On LoongArch, the frame pointer is the caller's stack pointer.
// The saved frame pointer is stored at fp[-2], and the return
// address is stored at fp[-1].
# define FRAME_POINTER_NEXT_OFFSET -2
# define FRAME_POINTER_RETURN_OFFSET -1
#else
# define FRAME_POINTER_NEXT_OFFSET 0
# define FRAME_POINTER_RETURN_OFFSET 1
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