84 lines
2.3 KiB
ArmAsm
84 lines
2.3 KiB
ArmAsm
/* Wrapper around clone system call.
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Copyright (C) 1997 Free Software Foundation, Inc.
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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 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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#include <sysdep.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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/* This is the only really unusual system call in PPC linux, but not
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because of any weirdness in the system call itself; because of
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all the freaky stuff we have to do to make the call useful. */
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/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
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ENTRY(__clone)
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/* Set up stack frame, save registers. */
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stwu %r1,-32(%r1)
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/* Check for child_stack == NULL || fn == NULL. */
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cmpwi %cr0,%r4,0
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stw %r31,16(%r1)
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cmpwi %cr1,%r3,0
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stw %r30,20(%r1)
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beq- %cr0,badargs
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beq- %cr1,badargs
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/* Set up stack frame for child. */
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addi %r4,%r4,-16
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clrrwi %r4,%r4,4
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li %r0,0
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stw %r0,0(%r4)
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/* Save fn, args across syscall. */
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mr %r30,%r3 /* Function in r30. */
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mr %r31,%r6 /* Arguments in r31. */
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/* 'flags' argument is first parameter to clone syscall. (The other
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argument is the stack pointer, already in r4.) */
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mr %r3,%r5
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/* Do the call. */
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DO_CALL(SYS_ify(clone))
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bso- error
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beq child
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/* Parent. Restore registers & return. */
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lwz %r31,16(%r1)
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lwz %r30,20(%r1)
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addi %r1,%r1,32
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blr
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child:
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/* Call procedure. */
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mtlr %r30
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mr %r3,%r31
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blrl
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/* Call _exit with result from procedure. */
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b JUMPTARGET(_exit)
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badargs:
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li %r3,EINVAL
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error:
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lwz %r31,16(%r1)
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lwz %r30,20(%r1)
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addi %r1,%r1,32
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b JUMPTARGET(__syscall_error)
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END (__clone)
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weak_alias (__clone, clone)
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