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chore: support apple m1 backtraces #354

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chore: support apple m1 backtraces #354

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23 changes: 23 additions & 0 deletions backward.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -985,6 +985,29 @@ class StackTraceImpl<system_tag::current_tag> : public StackTraceImplHolder {
}
_stacktrace[index] = reinterpret_cast<void *>(ctx.regs[UNW_ARM_R15]);
++index;

#elif defined(__APPLE__) && (defined(__arm__) || defined(__arm64__)) //apple arm m1
unw_getcontext(&ctx);

// If the IP is the same as the crash address we have a bad function
// dereference The caller's address is pointed to by the link
// pointer, so we dereference that value and set it to be the next
// frame's IP.
if (uctx->uc_mcontext->__ss.__pc ==
reinterpret_cast<__uint64_t>(error_addr())) {
uctx->uc_mcontext->__ss.__pc = uctx->uc_mcontext->__ss.__lr;
}

// 29 general purpose registers
for (int i = 0; i <= 28; i++) {
ctx.data[i] = uctx->uc_mcontext->__ss.__x[i];
}
ctx.data[29] = uctx->uc_mcontext->__ss.__fp;
ctx.data[30] = uctx->uc_mcontext->__ss.__lr;
ctx.data[31] = uctx->uc_mcontext->__ss.__sp;
ctx.data[32] = uctx->uc_mcontext->__ss.__pc;
_stacktrace[index] = reinterpret_cast<void *>(ctx.data[32]);
++index;
#elif defined(__aarch64__) // gcc libunwind/arm64
unw_getcontext(&ctx);
// If the IP is the same as the crash address we have a bad function
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