[PATCH] D114818: [libunwind] Fix unwind_leaffunction test

[Leonard Chan via Phabricator via llvm-commits]

leonardchan updated this revision to Diff 391528.
leonardchan edited the summary of this revision.
Herald added subscribers: pengfei, kristof.beyls.

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D114818/new/

https://reviews.llvm.org/D114818

Files:
  libunwind/test/unwind_leaffunction.pass.cpp


Index: libunwind/test/unwind_leaffunction.pass.cpp
===================================================================
--- libunwind/test/unwind_leaffunction.pass.cpp
+++ libunwind/test/unwind_leaffunction.pass.cpp
@@ -39,11 +39,17 @@
 }
 
 __attribute__((noinline)) void crashing_leaf_func(void) {
-  raise(SIGSEGV);
+  // libunwind searches for the address before the return address which points
+  // to the trap instruction. NOP guarantees the trap instruction is not the
+  // first instruction of the function.
+  // We should keep this here for other unwinders that also decrement pc.
+  __asm__ __volatile__("nop");
+  __builtin_trap();
 }
 
 int main(int, char**) {
-  signal(SIGSEGV, signal_handler);
+  signal(SIGTRAP, signal_handler);
+  signal(SIGILL, signal_handler);
   crashing_leaf_func();
   return -2;
 }


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