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81 lines
2.1 KiB
ArmAsm
81 lines
2.1 KiB
ArmAsm
/* Copyright 2001-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Alexandre Oliva <aoliva@redhat.com>.
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Based on ../i386/clone.S.
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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. 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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#include <asm-syntax.h>
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#include <bp-sym.h>
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/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
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.text
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ENTRY (BP_SYM (__clone))
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/* Sanity check arguments. */
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cmp 0,d0 /* no NULL function pointers */
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beq L(error_inval)
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cmp 0,d1 /* no NULL stack pointers */
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beq L(error_inval)
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/* Allocate room for a function call in the new stack, and
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store fn and arg in it. They will be read back in
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thread_start. */
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mov d1,a0
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sub 12,a0
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mov d0,(a0)
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mov (16,sp),d1
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mov d1,(4,a0)
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/* Do the system call */
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mov a0,d1
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mov (12,sp),a0
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mov SYS_ify(clone),d0
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syscall 0
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cmp 0,d0
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beq thread_start
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blt L(to_SYSCALL_ERROR_LABEL)
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L(pseudo_end):
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ret
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L(error_inval):
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mov -EINVAL,d0
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L(to_SYSCALL_ERROR_LABEL):
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jmp SYSCALL_ERROR_LABEL
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thread_start:
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mov 0,a3 /* terminate the stack frame */
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mov (4,sp),d0
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mov (sp),a0
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calls (a0)
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#ifdef PIC
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L(here):
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mov pc,a2
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add _GLOBAL_OFFSET_TABLE_-(L(here) - .),a2
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#endif
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call JUMPTARGET (_exit),[],0
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PSEUDO_END (BP_SYM (__clone))
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weak_alias (BP_SYM (__clone), BP_SYM (clone))
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