2014-01-01 19:03:15 +08:00
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/* Copyright (C) 1996-2014 Free Software Foundation, Inc.
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2012-01-10 13:38:42 +08:00
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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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#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 *ptid, struct user_desc *tls, pid_t *ctid);
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INCOMING: r5 (fn), r6 (child_stack), r7 (flags), r8 (arg), r9 (ptid)
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r10 (tls), 28 (r1) ctid
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OUTGOING:
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linux: arch/microblaze/entry.S: sys_clone expects
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r5 (flags) r6 (child stack) r7 (stack_size) r8 (ptid)r9 (ctid)
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r10 (tls)
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*/
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.text
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ENTRY (__clone)
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addik r3,r0,-EINVAL
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beqi r5,SYSCALL_ERROR_LABEL ; // Invalid func
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beqi r6,SYSCALL_ERROR_LABEL ; // Invalid stack
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addik r6,r6,-8
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swi r5,r6,0 ; // Push fn onto child's stack
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swi r8,r6,4 ; // Push arg for child
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addk r5,r0,r7 ; // flags for clone() syscall
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addk r7,r0,r0
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addk r8,r0,r9 ; // parent tid ptr
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lwi r9,r1,28 ; // child tid ptr
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addik r12,r0,SYS_ify(clone)
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brki r14,8
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addk r0,r0,r0
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addik r4,r0,-4095
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cmpu r4,r4,r3
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bgei r4,SYSCALL_ERROR_LABEL
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beqi r3,L(thread_start)
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rtsd r15,8
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nop
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L(thread_start):
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lwi r12,r1,0 ; // fn
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lwi r5,r1,4 ; // arg
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brald r15,r12
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nop
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addk r5,r0,r3
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addik r12,r0,SYS_ify(exit)
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brki r14,8
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nop
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PSEUDO_END(__clone)
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weak_alias (__clone,clone)
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