Get sparc building again after ASAN merge.

libsanitizer/

	* asan/asan_linux.cc (GetPcSpBp): Add sparc support.

From-SVN: r193468

libsanitizer/ChangeLog.asan

+2012-11-12  David S. Miller  <davem@davemloft.net>
+
+	* asan/asan_linux.cc (GetPcSpBp): Add sparc support.
+
 2012-10-29  Wei Mi  <wmi@google.com>
 
 	Initial checkin: migrate asan runtime from llvm.

libsanitizer/asan/asan_linux.cc

@@ -66,6 +66,20 @@ void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
   *pc = ucontext->uc_mcontext.gregs[REG_EIP];
   *bp = ucontext->uc_mcontext.gregs[REG_EBP];
   *sp = ucontext->uc_mcontext.gregs[REG_ESP];
+# elif defined(__sparc__)
+  ucontext_t *ucontext = (ucontext_t*)context;
+  uptr *stk_ptr;
+# if defined (__arch64__)
+  *pc = ucontext->uc_mcontext.mc_gregs[MC_PC];
+  *sp = ucontext->uc_mcontext.mc_gregs[MC_O6];
+  stk_ptr = (uptr *) (*sp + 2047);
+  *bp = stk_ptr[15];
+# else
+  *pc = ucontext->uc_mcontext.gregs[REG_PC];
+  *sp = ucontext->uc_mcontext.gregs[REG_O6];
+  stk_ptr = (uptr *) *sp;
+  *bp = stk_ptr[15];
+# endif
 #else
 # error "Unsupported arch"
 #endif