libsanitizer: Fix GetPcSpBp determination of SP on 32-bit Solaris/x86

The latest Solaris 11.4/x86 update uncovered a libsanitizer bug that
caused one test to FAIL for 32-bit:

+FAIL: c-c++-common/asan/null-deref-1.c   -O0  output pattern test
+FAIL: c-c++-common/asan/null-deref-1.c   -O1  output pattern test
+FAIL: c-c++-common/asan/null-deref-1.c   -O2  output pattern test
+FAIL: c-c++-common/asan/null-deref-1.c   -O2 -flto  output pattern test
+FAIL: c-c++-common/asan/null-deref-1.c -O2 -flto -flto-partition=none
output pattern test
+FAIL: c-c++-common/asan/null-deref-1.c   -O3 -g  output pattern test
+FAIL: c-c++-common/asan/null-deref-1.c   -Os  output pattern test

I've identified the problem and the fix has just landed in upstream
llvm-project:

	https://reviews.llvm.org/D83664

Tested on i386-pc-solaris2.11 and x86_64-pc-linux.gnu.

	libsanitizer:
	* sanitizer_common/sanitizer_linux.cpp: Cherry-pick llvm-project
	revision f0e9b76c3500496f8f3ea7abe6f4bf801e3b41e7.

diff --git a/libsanitizer/sanitizer_common/sanitizer_linux.cpp b/libsanitizer/sanitizer_common/sanitizer_linux.cpp
index 3807a79b1cdb9f1922af9386380132ed9167ca40..15ccd738d858bb7afea21b59fc453027ec49f0a1 100644 (file)
--- a/libsanitizer/sanitizer_common/sanitizer_linux.cpp
+++ b/libsanitizer/sanitizer_common/sanitizer_linux.cpp
@@ -1924,13 +1924,13 @@ static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
 # ifndef REG_EBP
 #  define REG_EBP  6 // REG_FP
 # endif
-# ifndef REG_ESP
-#  define REG_ESP 17 // REG_SP
+# ifndef REG_UESP
+#  define REG_UESP 17 // REG_SP
 # endif
 # endif
   *pc = ucontext->uc_mcontext.gregs[REG_EIP];
   *bp = ucontext->uc_mcontext.gregs[REG_EBP];
-  *sp = ucontext->uc_mcontext.gregs[REG_ESP];
+  *sp = ucontext->uc_mcontext.gregs[REG_UESP];
 # endif
 #elif defined(__powerpc__) || defined(__powerpc64__)
   ucontext_t *ucontext = (ucontext_t*)context;