2001-03-16 09:57:45 +00:00
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/* Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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2000-08-02 15:15:00 +00:00
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Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 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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/*int __clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg);*/
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/* sys_clone(void *child_stack, unsigned long flags) */
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.text
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ENTRY(__clone)
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/* Sanity check arguments & move registers */
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ltr %r1,%r2 /* no NULL function pointers */
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lhi %r2,-EINVAL
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jz SYSCALL_ERROR_LABEL
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ltr %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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lr %r2,%r3
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lr %r3,%r4
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svc SYS_ify(clone)
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ltr %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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lr %r2,%r5 /* set first parameter to void *arg */
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sr %r11,%r11 /* terminate the stack frame */
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ahi %r15,-96 /* 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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basr %r12,0
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.L0: lr %r1,%r12
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al %r12,.L1-.L0(%r12)
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al %r1,.L2-.L0(%r1)
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br %r1 /* branch to _exit -> thread termination */
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.L1: .long _GLOBAL_OFFSET_TABLE_ - .L0
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.L2: .long _exit@PLT - .L0
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#else
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basr %r1,0
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.L0: al %r1,.L1-.L0(0,%r1)
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br %r1 /* branch to _exit -> thread termination */
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.L1: .long _exit - .L0
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#endif
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PSEUDO_END (__clone)
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