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std.debug.SelfInfo: mark ARM unwinding as unsupported

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We need to parse the `.ARM.exidx` section to be able to reliably unwind
the stack on ARM.
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mlugg 2025-09-22 15:39:16 +01:00
parent 950a9d2a10
commit dbda011ae6
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2 changed files with 9 additions and 3 deletions
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4
lib/std/debug/SelfInfo/ElfModule.zig
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@ -266,8 +266,10 @@ pub fn unwindFrame(module: *const ElfModule, gpa: Allocator, di: *DebugInfo, con
} }
pub const UnwindContext = std.debug.SelfInfo.DwarfUnwindContext; pub const UnwindContext = std.debug.SelfInfo.DwarfUnwindContext;
pub const supports_unwinding: bool = s: { pub const supports_unwinding: bool = s: {
// Notably, we are yet to support unwinding on ARM. There, unwinding is not done through
// `.eh_frame`, but instead with the `.ARM.exidx` section, which has a different format.
const archs: []const std.Target.Cpu.Arch = switch (builtin.target.os.tag) { const archs: []const std.Target.Cpu.Arch = switch (builtin.target.os.tag) {
.linux => &.{ .x86, .x86_64, .arm, .armeb, .thumb, .thumbeb, .aarch64, .aarch64_be }, .linux => &.{ .x86, .x86_64, .aarch64, .aarch64_be },
.netbsd => &.{ .x86, .x86_64, .aarch64, .aarch64_be }, .netbsd => &.{ .x86, .x86_64, .aarch64, .aarch64_be },
.freebsd => &.{ .x86_64, .aarch64, .aarch64_be }, .freebsd => &.{ .x86_64, .aarch64, .aarch64_be },
.openbsd => &.{.x86_64}, .openbsd => &.{.x86_64},

8
test/src/StackTrace.zig
View file

@ -62,8 +62,12 @@ fn addCaseTarget(
// On aarch64-macos, FP unwinding is blessed by Apple to always be reliable, and std.debug knows this. // On aarch64-macos, FP unwinding is blessed by Apple to always be reliable, and std.debug knows this.
const fp_unwind_is_safe = target.result.cpu.arch == .aarch64 and target.result.os.tag.isDarwin(); const fp_unwind_is_safe = target.result.cpu.arch == .aarch64 and target.result.os.tag.isDarwin();
// On x86-windows, only FP unwinding is available. const supports_unwind_tables = switch (target.result.os.tag) {
const supports_unwind_tables = target.result.os.tag != .windows or target.result.cpu.arch != .x86; // x86-windows just has no way to do stack unwinding other then using frame pointers.
.windows => target.result.cpu.arch != .x86,
// We do not yet implement support for the AArch32 exception table section `.ARM.exidx`.
else => !target.result.cpu.arch.isArm(),
};
const use_llvm_vals: []const bool = if (both_backends) &.{ true, false } else &.{true}; const use_llvm_vals: []const bool = if (both_backends) &.{ true, false } else &.{true};
const pie_vals: []const ?bool = if (both_pie) &.{ true, false } else &.{null}; const pie_vals: []const ?bool = if (both_pie) &.{ true, false } else &.{null};