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75 lines
2.0 KiB
ArmAsm
75 lines
2.0 KiB
ArmAsm
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/* 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 <errnos.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 1,-20(1)
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stw 31,16(1)
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/* Check for child_stack == NULL, fn == NULL. */
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mr. 31,4
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cmpwi 1,3,0
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cror 2+0*4,2+0*4,2+1*4
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beq- 0,badargs
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/* Save 'fn' and its argument on the new stack. */
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stw 3,0(4)
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stw 6,4(4)
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/* 'flags' argument is (only) parameter to clone syscall. */
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mr 3,5
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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 31,20(1)
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addi 1,1,20
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blr
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child:
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/* Get address of procedure to call. */
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lwz 0,0(31)
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/* Set up argument register. */
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lwz 3,4(31)
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mtlr 0
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/* Switch to new stack. */
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mr 1,31
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/* Call procedure. */
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blrl
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/* Call _exit with result from procedure. */
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DO_CALL (SYS_ify (exit))
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badargs:
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li 3,-EINVAL
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error:
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b __syscall_error
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