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debug: fixup an inconsistency in the getcontext implementation on aarch64-macos

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kcbanner 2023-07-12 21:45:26 -04:00
parent 06bf2e048b
commit 9549b4acf6
1 changed files with 9 additions and 1 deletions
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10
lib/std/debug.zig
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@ -190,7 +190,15 @@ pub inline fn getContext(context: *ThreadContext) bool {
} }
const result = have_getcontext and os.system.getcontext(context) == 0; const result = have_getcontext and os.system.getcontext(context) == 0;
if (native_os == .macos) assert(context.mcsize == @sizeOf(std.c.mcontext_t)); if (native_os == .macos) {
assert(context.mcsize == @sizeOf(std.c.mcontext_t));
// On aarch64-macos, the system getcontext doesn't write anything into the pc
// register slot, it only writes lr. This makes the context consistent with
// other aarch64 getcontext implementations which write the current lr
// (where getcontext will return to) into both the lr and pc slot of the context.
if (native_arch == .aarch64) context.mcontext.ss.pc = context.mcontext.ss.lr;
}
return result; return result;
} }