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std.debug.Dwarf.SelfUnwinder: default some s390x registers to the same-value rule

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Alex Rønne Petersen 2025-10-03 03:45:52 +02:00
parent 8263f55ab2
commit 95bdb0c1c6
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1 changed files with 7 additions and 3 deletions
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lib/std/debug/Dwarf/SelfUnwinder.zig
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@ -197,9 +197,13 @@ fn nextInner(unwinder: *SelfUnwinder, gpa: Allocator, cache_entry: *const CacheE
// If unspecified, we'll use the default rule for the return address register, which is
// typically equivalent to `.undefined` (meaning there is no return address), but may be
// overriden by ABIs.
var has_return_address: bool = builtin.cpu.arch.isAARCH64() and
return_address_register >= 19 and
return_address_register <= 28;
var has_return_address: bool = switch (builtin.cpu.arch) {
// DWARF for the Arm 64-bit Architecture (AArch64) §4.3, p1
.aarch64, .aarch64_be => return_address_register >= 19 and return_address_register <= 28,
// ELF ABI s390x Supplement §1.6.4
.s390x => return_address_register >= 6 and return_address_register <= 15,
else => false,
};
// Create a copy of the CPU state, to which we will apply the new rules.
var new_cpu_state = unwinder.cpu_state;