[thirdparty/glibc.git] / sysdeps / unix / sysv / linux / sh / vfork.S

/* Copyright (C) 2004-2025 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/>.  */

#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 (__libc_vfork)

	mov.w	.L1, r3
	trapa	#0x10
	mov     r0, r1

	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
	.align	2
PSEUDO_END (__libc_vfork)

#if IS_IN (libc)
weak_alias (__libc_vfork, vfork)
strong_alias (__libc_vfork, __vfork)
libc_hidden_def (__vfork)
#endif
Commit	Line	Data
	1	/* Copyright (C) 2004-2025 Free Software Foundation, Inc.
	2	This file is part of the GNU C Library.
	3
	4	The GNU C Library is free software; you can redistribute it and/or
	5	modify it under the terms of the GNU Lesser General Public
	6	License as published by the Free Software Foundation; either
	7	version 2.1 of the License, or (at your option) any later version.
	8
	9	The GNU C Library is distributed in the hope that it will be useful,
	10	but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	12	Lesser General Public License for more details.
	13
	14	You should have received a copy of the GNU Lesser General Public
	15	License along with the GNU C Library; if not, see
	16	<https://www.gnu.org/licenses/>. */
	17
	18	#include <sysdep.h>
	19	#define _ERRNO_H 1
	20	#include <bits/errno.h>
	21	#include <tcb-offsets.h>
	22
	23	/* Clone the calling process, but without copying the whole address space.
	24	The calling process is suspended until the new process exits or is
	25	replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
	26	and the process ID of the new process to the old process. */
	27
	28	ENTRY (__libc_vfork)
	29
	30	mov.w .L1, r3
	31	trapa #0x10
	32	mov r0, r1
	33
	34	mov #-12, r2
	35	shad r2, r1
	36	not r1, r1 // r1=0 means r0 = -1 to -4095
	37	tst r1, r1 // i.e. error in linux
	38	bf .Lpseudo_end
	39	SYSCALL_ERROR_HANDLER
	40	.Lpseudo_end:
	41	rts
	42	nop
	43	.L1:
	44	.word __NR_vfork
	45	.align 2
	46	PSEUDO_END (__libc_vfork)
	47
	48	#if IS_IN (libc)
	49	weak_alias (__libc_vfork, vfork)
	50	strong_alias (__libc_vfork, __vfork)
	51	libc_hidden_def (__vfork)
	52	#endif