python3-test-unwind-x32.patch

test_c_stack_unwind: on x32 the manual unwinder read the upper half of the
saved rbp as the return address (always 0) and found no Python frames.

--- Python-3.15.0.orig/Modules/_testinternalcapi.c	2026-10-09 23:24:21.282818226 +0200
+++ Python-3.15.0/Modules/_testinternalcapi.c	2026-10-09 23:24:21.359484893 +0200
@@ -103,6 +103,11 @@ static const uintptr_t min_frame_pointer
 // See: https://riscv-non-isa.github.io/riscv-elf-psabi-doc/#_frame_pointer_convention
 #  define FRAME_POINTER_NEXT_OFFSET -2
 #  define FRAME_POINTER_RETURN_OFFSET -1
+#elif defined(__x86_64__) && defined(__ILP32__)
+// x32 pushes the saved rbp and the return address as 8-byte slots while
+// uintptr_t is 4 bytes, so the (little-endian) return address is at fp[2].
+#  define FRAME_POINTER_NEXT_OFFSET 0
+#  define FRAME_POINTER_RETURN_OFFSET 2
 #else
 #  define FRAME_POINTER_NEXT_OFFSET 0
 #  define FRAME_POINTER_RETURN_OFFSET 1