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Branch to fork if libpthread is loaded. Elide backwards compatibility code

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when not required.
This commit is contained in:
Ulrich Drepper 2003-09-17 18:07:04 +00:00
parent 5abcf86949
commit 170880ee26
1 changed files with 31 additions and 8 deletions
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39
sysdeps/unix/sysv/linux/arm/linuxthreads/vfork.S
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@ -20,37 +20,60 @@
#include <sysdep-cancel.h>
#define _ERRNO_H 1
#include <bits/errno.h>
#include <kernel-features.h>
/* Clone the calling process, but without copying the whole address
pace.
/* 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
rocess,
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. */
PSEUDO_PROLOGUE
ENTRY (__vfork)
SINGLE_THREAD_P
bne HIDDEN_JUMPTARGET (__fork)
#ifdef __NR_vfork
#ifdef SHARED
ldr ip, 1f
ldr r0, 2f
3: add ip, pc, ip
ldr r0, [ip, r0]
#else
ldr r0, 1f
#endif
movs r0, r0
bne HIDDEN_JUMPTARGET (__fork)
swi __NR_vfork
cmn a1, #4096
RETINSTR(movcc, pc, lr)
#ifndef __ASSUME_VFORK_SYSCALL
/* Check if vfork syscall is known at all. */
ldr a2, =-ENOSYS
teq a1, a2
cmn a1, #ENOSYS
bne PLTJMP(C_SYMBOL_NAME(__syscall_error))
#endif
#endif
#ifndef __ASSUME_VFORK_SYSCALL
/* If we don't have vfork, fork is close enough. */
swi __NR_fork
cmn a1, #4096
RETINSTR(movcc, pc, lr)
#elif !defined __NR_vfork
# error "__NR_vfork not available and __ASSUME_VFORK_SYSCALL defined"
#endif
b PLTJMP(C_SYMBOL_NAME(__syscall_error))
#ifdef SHARED
1: .word _GLOBAL_OFFSET_TABLE_ - 3b - 8
2: .word __libc_pthread_functions(GOTOFF)
#else
.weak pthread_create
1: .word pthread_create
#endif
PSEUDO_END (__vfork)
libc_hidden_def (__vfork)