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[sanitizer] Do not break the CFI unwind chain in clone(). 

Fixes build on clang 3.2, which doesn't support cfi_undefined. This change
doesn't seem to break the slow unwinder. Even if it does, the worst thing that
could happen is that we would not see a backtrace when a fatal error happens
under StopTheWorld.

llvm-svn: 192196
This commit is contained in:
Sergey Matveev 2013-10-08 16:38:39 +00:00
parent ea9d124fd4
commit 398fb700a2
1 changed files with 3 additions and 3 deletions
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6
compiler-rt/lib/sanitizer_common/sanitizer_linux.cc
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@ -787,7 +787,6 @@ uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
*/
"movq %6,%%r8\n"
"movq %7,%%r10\n"
".cfi_endproc\n"
"syscall\n"
/* if (%rax != 0)
@ -797,8 +796,9 @@ uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
"jnz 1f\n"
/* In the child. Terminate unwind chain. */
".cfi_startproc\n"
".cfi_undefined %%rip;\n"
// XXX: We should also terminate the CFI unwind chain
// here. Unfortunately clang 3.2 doesn't support the
// necessary CFI directives, so we skip that part.
"xorq %%rbp,%%rbp\n"
/* Call "fn(arg)". */