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[TSan] Tiny cleanup of UnmangleLongJmpSp for Linux/x86_64

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llvm-svn: 365982
This commit is contained in:
Julian Lettner 2019-07-13 00:55:06 +00:00
parent cafb5d24df
commit 4f519b6919
1 changed files with 8 additions and 8 deletions
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16
compiler-rt/lib/tsan/rtl/tsan_platform_linux.cc
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@ -373,9 +373,7 @@ int ExtractRecvmsgFDs(void *msgp, int *fds, int nfd) {
// Reverse operation of libc stack pointer mangling
static uptr UnmangleLongJmpSp(uptr mangled_sp) {
#if defined(__x86_64__)
# if SANITIZER_FREEBSD || SANITIZER_NETBSD
return mangled_sp;
# else // Linux
# if SANITIZER_LINUX
// Reverse of:
// xor %fs:0x30, %rsi
// rol $0x11, %rsi
@ -385,6 +383,8 @@ static uptr UnmangleLongJmpSp(uptr mangled_sp) {
: "=r" (sp)
: "0" (mangled_sp));
return sp;
# else
return mangled_sp;
# endif
#elif defined(__aarch64__)
# if SANITIZER_LINUX
@ -394,11 +394,11 @@ static uptr UnmangleLongJmpSp(uptr mangled_sp) {
# endif
#elif defined(__powerpc64__)
// Reverse of:
// ld r4, -28696(r13)
// xor r4, r3, r4
uptr xor_guard;
asm("ld %0, -28696(%%r13) \n" : "=r" (xor_guard));
return mangled_sp ^ xor_guard;
// ld r4, -28696(r13)
// xor r4, r3, r4
uptr xor_key;
asm("ld %0, -28696(%%r13)" : "=r" (xor_key));
return mangled_sp ^ xor_key;
#elif defined(__mips__)
return mangled_sp;
#else