From: Ulrich Drepper <drepper@redhat.com>
Date: Fri, 11 Oct 2002 18:56:32 +0000 (+0000)
Subject: (profil_counter): Add hack to prevent the compiler from clobbering the signal context.
X-Git-Tag: cvs/initial~271
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=bd97565d089431795f0ee0546a08a0bafd39903a;p=platform%2Fupstream%2Fglibc.git

(profil_counter): Add hack to prevent the compiler from clobbering the signal context.
---

diff --git a/sysdeps/unix/sysv/linux/i386/profil-counter.h b/sysdeps/unix/sysv/linux/i386/profil-counter.h
index 9af0cbb..d592a7b 100644
--- a/sysdeps/unix/sysv/linux/i386/profil-counter.h
+++ b/sysdeps/unix/sysv/linux/i386/profil-counter.h
@@ -1,5 +1,5 @@
 /* Low-level statistical profiling support function.  Linux/i386 version.
-   Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
+   Copyright (C) 1996, 1997, 1998, 2002 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -21,7 +21,12 @@
 #include <sigcontextinfo.h>
 
 static void
-profil_counter (int signo, SIGCONTEXT scp)
+profil_counter (int signo, const SIGCONTEXT scp)
 {
   profil_count ((void *) GET_PC (scp));
+
+  /* This is a hack to prevent the compiler from implementing the
+     above function call as a sibcall.  The sibcall would overwrite
+     the signal context.  */
+  asm volatile ("");
 }