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[sanitizer] Be more accurate when calculating the previous instruction address on ARM. 

Differential Revision: https://reviews.llvm.org/D46004

llvm-svn: 331626
This commit is contained in:
Igor Kudrin 2018-05-07 10:07:22 +00:00
parent ffec58bce6
commit 61de8a5aef
1 changed files with 5 additions and 4 deletions
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9
compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.h
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@ -75,10 +75,11 @@ struct StackTrace {
ALWAYS_INLINE
uptr StackTrace::GetPreviousInstructionPc(uptr pc) {
#if defined(__arm__)
// Cancel Thumb bit.
pc = pc & (~1);
#endif
#if defined(__powerpc__) || defined(__powerpc64__)
// T32 (Thumb) branch instructions can be 16 or 32 bit long,
// so we return (pc-2) in that case in order to be safe.
// For A32 mode we return (pc-4) because all instructions are 32 bit long.
return (pc - 3) & (~1);
#elif defined(__powerpc__) || defined(__powerpc64__) || defined(__aarch64__)
// PCs are always 4 byte aligned.
return pc - 4;
#elif defined(__sparc__) || defined(__mips__)