/* * libc/sysdeps/linux/microblaze/vfork.S -- `vfork' syscall for linux/microblaze * * Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au> * Copyright (C) 2001 NEC Corporation * Copyright (C) 2001 Miles Bader <miles@gnu.org> * * This file is subject to the terms and conditions of the GNU Lesser * General Public License. See the file COPYING.LIB in the main * directory of this archive for more details. * * Written by Miles Bader <miles@gnu.org> * Microblaze port by John Williams */ #include <sys/syscall.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. */ .globl __vfork .hidden __vfork .align 4 __vfork: addi r12, r0, SYS_vfork brki r14, 0x08; addi r4, r3, 125 /* minimum err value */ blti r4, 1f /* is r3 < -125? */ bri 2f /* normal return */ 1: sub r3, r3, r0 /* r3 = -r3 */ #ifdef __PIC__ mfs r3,rpc addik r3,r3,_GLOBAL_OFFSET_TABLE_+8 lwi r3,r3,C_SYMBOL_NAME(errno)@GOT sw r3, r0, r3 #else swi r3, r0, C_SYMBOL_NAME(errno); #endif /* state restore etc */ 2: rtsd r15, 8 /* error return */ nop .size __vfork, .-__vfork weak_alias(__vfork,vfork) libc_hidden_def(vfork)