From fa2df520bcaaf3957db0489f1237311f091ac08d Mon Sep 17 00:00:00 2001
From: Jean byroot Boussier <jean.boussier+github@shopify.com>
Date: Wed, 20 Apr 2022 04:52:47 +0200
Subject: Enable C backtraces on Apple silicon (#5770)

Co-authored-by: Jean Boussier <jean.boussier@gmail.com>
---
 vm_dump.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/vm_dump.c b/vm_dump.c
index 271879ce18..e4410e3e7c 100644
--- a/vm_dump.c
+++ b/vm_dump.c
@@ -474,7 +474,7 @@ rb_vmdebug_thread_dump_state(VALUE self)
 # ifdef HAVE_LIBUNWIND
 #  undef backtrace
 #  define backtrace unw_backtrace
-# elif defined(__APPLE__) && defined(__x86_64__) && defined(HAVE_LIBUNWIND_H)
+# elif defined(__APPLE__) && defined(HAVE_LIBUNWIND_H)
 #  define UNW_LOCAL_ONLY
 #  include <libunwind.h>
 #  include <sys/mman.h>
@@ -503,6 +503,7 @@ backtrace(void **trace, int size)
 darwin_sigtramp:
     /* darwin's bundled libunwind doesn't support signal trampoline */
     {
+#if defined(__x86_64__)
 	ucontext_t *uctx;
 	char vec[1];
 	int r;
@@ -563,6 +564,8 @@ darwin_sigtramp:
 	    trace[n++] = (void *)ip;
 	    ip = *(unw_word_t*)uctx->uc_mcontext->MCTX_SS_REG(rsp);
 	}
+#endif
+
 	trace[n++] = (void *)ip;
 	unw_set_reg(&cursor, UNW_REG_IP, ip);
     }
-- 
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