mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-02 09:40:13 +00:00
a1bd5f8673
Use <arch-syscall.h> instead of <asm/unistd.h> to obtain the system call numbers. A few direct includes of <asm/unistd.h> need to be removed (if the system call numbers are already provided indirectly by <sysdep.h>) or replaced with <sys/syscall.h>. Current Linux headers for alpha define the required system call names, so most of the _NR_* hacks are no longer needed. For the 32-bit arm architecture, eliminate the INTERNAL_SYSCALL_ARM macro, now that we have regular system call names for cacheflush and set_tls. There are more such cleanup opportunities for other architectures, but these cleanups are required to avoid macro redefinition errors during the build. For ia64, it is desirable to use <asm/break.h> directly to obtain the break number for system calls (which is not a system call number itself). This requires replacing __BREAK_SYSCALL with __IA64_BREAK_SYSCALL because the former is defined as an alias in <asm/unistd.h>, but not in <asm/break.h>. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
94 lines
2.1 KiB
ArmAsm
94 lines
2.1 KiB
ArmAsm
/* Copyright (C) 2005-2020 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
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library. If not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
/* vfork() is just a special case of clone(). */
|
|
|
|
#include <sys/asm.h>
|
|
#include <sysdep.h>
|
|
#include <sgidefs.h>
|
|
#include <tls.h>
|
|
|
|
|
|
/* int vfork() */
|
|
|
|
.text
|
|
.set nomips16
|
|
LOCALSZ= 1
|
|
FRAMESZ= (((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK
|
|
GPOFF= FRAMESZ-(1*SZREG)
|
|
NESTED(__libc_vfork,FRAMESZ,sp)
|
|
#ifdef __PIC__
|
|
SETUP_GP
|
|
#endif
|
|
PTR_SUBU sp, FRAMESZ
|
|
cfi_adjust_cfa_offset (FRAMESZ)
|
|
SETUP_GP64_REG (a5, __libc_vfork)
|
|
#ifdef __PIC__
|
|
SAVE_GP (GPOFF)
|
|
#endif
|
|
#ifdef PROF
|
|
# if (_MIPS_SIM != _ABIO32)
|
|
PTR_S a5, GPOFF(sp)
|
|
# endif
|
|
.set noat
|
|
move $1, ra
|
|
# if (_MIPS_SIM == _ABIO32)
|
|
subu sp,sp,8
|
|
# endif
|
|
jal _mcount
|
|
.set at
|
|
# if (_MIPS_SIM != _ABIO32)
|
|
PTR_L a5, GPOFF(sp)
|
|
# endif
|
|
#endif
|
|
|
|
PTR_ADDU sp, FRAMESZ
|
|
cfi_adjust_cfa_offset (-FRAMESZ)
|
|
|
|
li a0, 0x4112 /* CLONE_VM | CLONE_VFORK | SIGCHLD */
|
|
move a1, sp
|
|
|
|
/* Do the system call */
|
|
li v0,__NR_clone
|
|
syscall
|
|
|
|
cfi_remember_state
|
|
bnez a3,L(error)
|
|
|
|
/* Successful return from the parent or child. */
|
|
RESTORE_GP64_REG
|
|
ret
|
|
|
|
/* Something bad happened -- no child created. */
|
|
L(error):
|
|
cfi_restore_state
|
|
#ifdef __PIC__
|
|
PTR_LA t9, __syscall_error
|
|
RESTORE_GP64_REG
|
|
jr t9
|
|
#else
|
|
RESTORE_GP64_REG
|
|
j __syscall_error
|
|
#endif
|
|
END(__libc_vfork)
|
|
|
|
#if IS_IN (libc)
|
|
weak_alias (__libc_vfork, vfork)
|
|
strong_alias (__libc_vfork, __vfork)
|
|
libc_hidden_def (__vfork)
|
|
#endif
|