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std.debug: use correct return address offset for s390x

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Makes FP-based unwinding work.
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Alex Rønne Petersen 2025-10-03 03:24:21 +02:00
parent 91fa2c61aa
commit 0f56d7afe2
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lib/std/debug.zig
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@ -952,6 +952,9 @@ const StackIterator = union(enum) {
/// Offset of the saved return address wrt the frame pointer.
const ra_offset = off: {
if (native_arch == .powerpc64le) break :off 2 * @sizeOf(usize);
// On s390x, r14 is the link register and we need to grab it from its customary slot in the
// register save area (ELF ABI s390x Supplement §1.2.2.2).
if (native_arch == .s390x) break :off 14 * @sizeOf(usize);
break :off @sizeOf(usize);
};