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

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This commit is contained in:
Ulrich Drepper 2002-10-14 17:26:14 +00:00
parent 4083e0ec25
commit 5e3ab761da
3 changed files with 18 additions and 3 deletions
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7
sysdeps/unix/sysv/linux/arm/profil-counter.h
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@ -1,5 +1,5 @@
/* Low-level statistical profiling support function. Linux/ARM version. /* 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. This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or 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 else
pc = (void *) sc.v21.arm_pc; pc = (void *) sc.v21.arm_pc;
profil_count (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 ("");
} }

7
sysdeps/unix/sysv/linux/sh/profil-counter.h
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@ -1,5 +1,5 @@
/* Low-level statistical profiling support function. Linux/SH version. /* 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. This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or 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; void *pc;
pc = (void *) sc.sc_pc; pc = (void *) sc.sc_pc;
profil_count (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 ("");
} }

7
sysdeps/unix/sysv/linux/x86_64/profil-counter.h
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@ -1,5 +1,5 @@
/* Low-level statistical profiling support function. Linux/x86-64 version. /* 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. This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or 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_counter (int signo, SIGCONTEXT scp)
{ {
profil_count ((void *) GET_PC (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 ("");
} }