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63 lines
1.8 KiB
ArmAsm
63 lines
1.8 KiB
ArmAsm
/* Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Pat Beirne <patb@corelcomputer.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 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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/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
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.text
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ENTRY(__clone)
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@ sanity check args
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cmp r0, #0
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cmpne r1, #0
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moveq r0, #-EINVAL
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beq PLTJMP(syscall_error)
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@ insert the args onto the new stack
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sub r1, r1, #8
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str r3, [r1, #4]
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@ save the function pointer as the 0th element
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str r0, [r1]
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@ do the system call
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@ get flags
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mov r0, r2
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@ new sp is already in r1
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swi SYS_ify(clone)
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movs a1, a1
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blt PLTJMP(C_SYMBOL_NAME(__syscall_error))
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RETINSTR(movne, pc, lr)
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@ pick the function arg and call address off the stack and execute
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ldr r0, [sp, #4]
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mov lr, pc
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ldr pc, [sp]
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@ and we are done, passing the return value through r0
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b PLTJMP(_exit)
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PSEUDO_END (__clone)
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weak_alias (__clone, clone)
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