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- /* Copyright (C) 2003, 2004 Free Software Foudnation, Inc.
- This file is part of the GNU C Library.
- Contributed by Alexandre Oliva <aoliva@redhat.com>, 2003.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- /* clone() is even more special than fork() as it mucks with stacks
- and invokes a function in the right context after its all over. */
- #include <features.h>
- #include <asm/unistd.h>
- #define _ERRNO_H 1
- #include <bits/errno.h>
- .text
- .globl clone
- .type clone,@function
- /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) */
- clone:
- /* Sanity check arguments. */
- cmp.p gr8, gr0, icc0
- cmp gr9, gr0, icc1
- mov.p gr8, gr4
- beq icc0, #0, .Lerror
- mov.p gr11, gr5
- beq icc1, #0, .Lerror
- mov.p gr10, gr8
- setlos #__NR_clone, gr7
- tra gr0,gr0
- cmp.p gr8, gr0, icc0
- setlos #-4096, gr6
- cmp.p gr8, gr6, icc1
- beq icc0, #0, .Lthread_start
- blslr icc1, #2
- .Lsys_error:
- sethi.p #gotofffuncdeschi(__syscall_error), gr14
- setlo #gotofffuncdesclo(__syscall_error), gr14
- ldd @(gr14, gr15), gr14
- jmpl @(gr14, gr0)
- .Lerror:
- setlos.p #-EINVAL, gr8
- bra .Lsys_error
- ###############################################################################
- #
- # come here as the new thread [GR4 is fn, GR5 is arg]
- #
- ###############################################################################
- .Lthread_start:
- /* Save the PIC register. */
- mov gr15, gr17
- /* Call the user's function. */
- ldd.p @(gr4, gr0), gr14
- mov gr5, gr8
- calll @(gr14, gr0)
- /* Call _exit, rather simply inlining the syscall, such that
- breakpoints work.*/
- mov.p gr17, gr15
- call HIDDEN_JUMPTARGET(_exit)
- /* Should never get here. */
- jmpl @(gr0, gr0)
- .size clone,.-clone
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