57 lines
1.9 KiB
ArmAsm
57 lines
1.9 KiB
ArmAsm
/* Wrapper around clone system call. 64 bit S/390 version.
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Copyright (C) 2001 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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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#define _ERRNO_H 1
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#include <bits/errno.h>
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.text
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ENTRY(__clone)
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/* Sanity check arguments & move registers */
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ltgr %r1,%r2 /* no NULL function pointers */
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lghi %r2,-EINVAL
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jz SYSCALL_ERROR_LABEL
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ltgr %r3,%r3 /* no NULL stack pointers */
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jz SYSCALL_ERROR_LABEL
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/* move child_stack and flags, then call SVC */
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lgr %r2,%r3
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lgr %r3,%r4
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svc SYS_ify(clone)
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ltgr %r2,%r2 /* check return code */
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jm SYSCALL_ERROR_LABEL
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jz thread_start
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br %r14
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thread_start:
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/* fn is in gpr 1, arg in gpr 5 */
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lgr %r2,%r5 /* set first parameter to void *arg */
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sgr %r11,%r11 /* terminate the stack frame */
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aghi %r15,-160 /* make room on the stack for the save area */
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basr %r14,%r1 /* jump to fn */
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#ifdef PIC
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larl %r12,_GLOBAL_OFFSET_TABLE_
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#endif
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jg _exit@PLT /* branch to _exit -> thread termination */
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PSEUDO_END (__clone)
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weak_alias (__clone, clone)
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