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

diff --git a/sysdeps/unix/sysv/linux/arm/profil-counter.h b/sysdeps/unix/sysv/linux/arm/profil-counter.h
index 5d8be9dba64e51c066e7786e124b99ae2e35df28..7639883f10ebc982dc626d4f06959452bb524e33 100644 (file)
--- a/sysdeps/unix/sysv/linux/arm/profil-counter.h
+++ b/sysdeps/unix/sysv/linux/arm/profil-counter.h
@@ -1,5 +1,5 @@
 /* Low-level statistical profiling support function.  Linux/ARM 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
@@ -29,4 +29,9 @@ profil_counter (int signo, int _a2, int _a3, int _a4, union k_sigcontext sc)
   else
     pc = (void *) sc.v21.arm_pc;
   profil_count (pc);
+
+  /* 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 ("");
 }

diff --git a/sysdeps/unix/sysv/linux/sh/profil-counter.h b/sysdeps/unix/sysv/linux/sh/profil-counter.h
index fe1df15addc0f15d626e6dc8a919b61651da3e86..ae1b97828cf2677e49f9e9d0bb4f2189eafff14f 100644 (file)
--- a/sysdeps/unix/sysv/linux/sh/profil-counter.h
+++ b/sysdeps/unix/sysv/linux/sh/profil-counter.h
@@ -1,5 +1,5 @@
 /* Low-level statistical profiling support function.  Linux/SH version.
-   Copyright (C) 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
+   Copyright (C) 1996, 1997, 1998, 2000, 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
@@ -25,4 +25,9 @@ profil_counter (int signo, int _a2, int _a3, int _a4, struct sigcontext sc)
   void *pc;
   pc = (void *) sc.sc_pc;
   profil_count (pc);
+
+  /* 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 ("");
 }

diff --git a/sysdeps/unix/sysv/linux/x86_64/profil-counter.h b/sysdeps/unix/sysv/linux/x86_64/profil-counter.h
index 41b99e0a88734705c0a9b541cb483f387ac56b25..0b244175a806d792683d9ce8e0737db55339d41a 100644 (file)
--- a/sysdeps/unix/sysv/linux/x86_64/profil-counter.h
+++ b/sysdeps/unix/sysv/linux/x86_64/profil-counter.h
@@ -1,5 +1,5 @@
 /* Low-level statistical profiling support function.  Linux/x86-64 version.
-   Copyright (C) 2001 Free Software Foundation, Inc.
+   Copyright (C) 2001, 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
@@ -24,4 +24,9 @@ static void
 profil_counter (int signo, 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 ("");
 }