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| author | Ulrich Drepper <drepper@redhat.com> | 2004-03-09 06:32:58 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2004-03-09 06:32:58 +0000 |
| commit | 6fadea9f1d26e09e7da4c4c6ae2ba976fef73c25 (patch) | |
| tree | 2be99959b9b5340df51d5c2f220fb436621e9f4d /nptl/sysdeps/unix/sysv/linux/i386/vfork.S | |
| parent | c072ef6d229b1c504e0cff58371df892ec289dec (diff) | |
| download | glibc-6fadea9f1d26e09e7da4c4c6ae2ba976fef73c25.tar glibc-6fadea9f1d26e09e7da4c4c6ae2ba976fef73c25.tar.gz glibc-6fadea9f1d26e09e7da4c4c6ae2ba976fef73c25.tar.bz2 glibc-6fadea9f1d26e09e7da4c4c6ae2ba976fef73c25.zip | |
Update.
* sysdeps/unix/sysv/linux/i386/vfork.S: If SAVE_PID and
RESTORE_PID are defined, use it.
* sysdeps/unix/sysv/linux/x86_64/vfork.S: Likewise.
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/i386/vfork.S')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/i386/vfork.S | 73 |
1 files changed, 10 insertions, 63 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/i386/vfork.S b/nptl/sysdeps/unix/sysv/linux/i386/vfork.S index 787453427b..2b60a5ea5e 100644 --- a/nptl/sysdeps/unix/sysv/linux/i386/vfork.S +++ b/nptl/sysdeps/unix/sysv/linux/i386/vfork.S @@ -1,6 +1,5 @@ /* Copyright (C) 1999, 2002, 2004 Free Software Foundation, Inc. This file is part of the GNU C Library. - Contributed by Andreas Schwab <schwab@gnu.org>. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public @@ -17,71 +16,19 @@ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ -#include <sysdep.h> -#define _ERRNO_H 1 -#include <bits/errno.h> -#include <kernel-features.h> #include <tcb-offsets.h> -/* Clone the calling process, but without copying the whole address space. - The calling process is suspended until the new process exits or is - replaced by a call to `execve'. Return -1 for errors, 0 to the new process, - and the process ID of the new process to the old process. */ - -ENTRY (__vfork) - -#ifdef __NR_vfork - - /* Pop the return PC value into ECX. */ - popl %ecx - - /* Save the PID value. */ - movl %gs:PID, %edx +/* Save the PID value. */ +#define SAVE_PID \ + movl %gs:PID, %edx; \ movl $-1, %gs:PID - /* Stuff the syscall number in EAX and enter into the kernel. */ - movl $SYS_ify (vfork), %eax - int $0x80 - - /* Jump to the return PC. Don't jump directly since this - disturbs the branch target cache. Instead push the return - address back on the stack. */ - pushl %ecx - - /* Restore the old PID value in the parent. In the child store 0. */ - testl %eax, %eax - je 1f - movl %edx, %gs:PID - -1: cmpl $-4095, %eax - /* Branch forward if it failed. */ -# ifdef __ASSUME_VFORK_SYSCALL - jae SYSCALL_ERROR_LABEL -.Lpseudo_end: -# else - jae .Lerror -# endif - ret - -# ifndef __ASSUME_VFORK_SYSCALL -.Lerror: - /* Check if vfork syscall is known at all. */ - cmpl $-ENOSYS, %eax - jne SYSCALL_ERROR_LABEL -# endif -#endif - -#ifndef __ASSUME_VFORK_SYSCALL - /* If we don't have vfork, fork is close enough. */ +/* Restore the old PID value in the parent. In the child store 0. */ +#define RESTORE_PID \ + testl %eax, %eax; \ + je 1f; \ + movl %edx, %gs:PID; \ +1: - movl $SYS_ify (fork), %eax - int $0x80 - cmpl $-4095, %eax - jae SYSCALL_ERROR_LABEL -.Lpseudo_end: - ret -#endif -PSEUDO_END (__vfork) -libc_hidden_def (__vfork) -weak_alias (__vfork, vfork) +#include <sysdeps/unix/sysv/linux/i386/vfork.S> |