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- /* Copyright (C) 2004 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
- <http://www.gnu.org/licenses/>. */
- #include <sysdep.h>
- #define _ERRNO_H 1
- #include <bits/errno.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)
- /* Save the PID value. */
- stc gbr, r2
- mov.w .L2, r0
- mov.l @(r0,r2), r4
- neg r4, r1
- tst r1, r1
- bf 1f
- mov #1, r1
- rotr r1
- 1:
- mov.l r1, @(r0,r2)
- mov.w .L1, r3
- trapa #0x10
- mov r0, r1
- /* Restore the old PID value in the parent. */
- tst r0, r0
- bt.s 2f
- stc gbr, r2
- mov.w .L2, r0
- mov.l r4, @(r0,r2)
- mov r1, r0
- 2:
- mov #-12, r2
- shad r2, r1
- not r1, r1 // r1=0 means r0 = -1 to -4095
- tst r1, r1 // i.e. error in linux
- bf .Lpseudo_end
- SYSCALL_ERROR_HANDLER
- .Lpseudo_end:
- rts
- nop
- .L1:
- .word __NR_vfork
- .L2:
- .word PID - TLS_PRE_TCB_SIZE
- .align 2
- PSEUDO_END (__vfork)
- hidden_def (vfork)
- weak_alias (__vfork, vfork)
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