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77 lines
2.6 KiB
ArmAsm
77 lines
2.6 KiB
ArmAsm
/* Wrapper around clone system call. 64 bit S/390 version.
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Copyright (C) 2001-2015 Free Software Foundation, Inc.
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Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* clone is even more special than fork as it mucks with stacks
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and invokes a function in the right context after its all over. */
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#include <sysdep.h>
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#include <tls.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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/* int __clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
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pid_t *parent_tid, void *tls, pid_t *child_tid); */
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/* sys_clone (void *child_stack, unsigned long flags,
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pid_t *parent_tid, pid_t *child_tid, void *tls); */
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.text
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ENTRY(__clone)
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stg %r6,48(%r15) /* store %r6 to save area */
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cfi_offset (%r6,-112)
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lgr %r0,%r5 /* move *arg out of the way */
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ltgr %r1,%r2 /* check fn and move to %r1 */
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jz error /* no NULL function pointers */
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ltgr %r2,%r3 /* check child_stack and move to %r2 */
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jz error /* no NULL stack pointers */
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lgr %r3,%r4 /* move flags to %r3 */
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lgr %r4,%r6 /* move parent_tid to %r4 */
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lg %r5,168(%r15) /* load child_tid from stack */
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lg %r6,160(%r15) /* load tls from stack */
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svc SYS_ify(clone)
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ltgr %r2,%r2 /* check return code */
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jz thread_start
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lg %r6,48(%r15) /* restore %r6 */
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jgm SYSCALL_ERROR_LABEL
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br %r14
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error:
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lghi %r2,-EINVAL
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jg SYSCALL_ERROR_LABEL
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PSEUDO_END (__clone)
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thread_start:
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tmh %r3,1 /* CLONE_THREAD == 0x00010000 */
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jne 1f
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lhi %r2,-1
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tml %r3,256 /* CLONE_VM == 0x00000100 */
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jne 2f
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svc SYS_ify(getpid)
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2: ear %r3,%a0
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sllg %r3,%r3,32
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ear %r3,%a1
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st %r2,PID(%r3)
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st %r2,TID(%r3)
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1:
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/* fn is in gpr 1, arg in gpr 0 */
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lgr %r2,%r0 /* set first parameter to void *arg */
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aghi %r15,-160 /* make room on the stack for the save area */
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xc 0(8,%r15),0(%r15)
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basr %r14,%r1 /* jump to fn */
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DO_CALL (exit, 1)
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weak_alias (__clone, clone)
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