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- /* Copyright (C) 1996, 1997, 1998, 2000, 2003, 2004, 2007
- Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Richard Henderson (rth@tamu.edu).
- 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, see
- <http://www.gnu.org/licenses/>. */
- /* 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 <asm/errno.h>
- #include <asm/unistd.h>
- #ifdef RESET_PID
- #include <tcb-offsets.h>
- #endif
- #include <sysdep.h>
- #define CLONE_VM 0x00000100
- #define CLONE_THREAD 0x00010000
- /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
- pid_t *ptid, void *tls, pid_t *ctid); */
- .text
- ENTRY (__clone)
- save %sp,-96,%sp
- cfi_def_cfa_register(%fp)
- cfi_window_save
- cfi_register(%o7, %i7)
- /* sanity check arguments */
- orcc %i0,%g0,%g2
- be .Leinval
- orcc %i1,%g0,%o1
- be .Leinval
- mov %i2,%o0
- /* The child_stack is the top of the stack, allocate one
- whole stack frame from that as this is what the kernel
- expects. */
- sub %o1, 96, %o1
- mov %i3, %g3
- mov %i2, %g4
- /* ptid */
- mov %i4,%o2
- /* tls */
- mov %i5,%o3
- /* ctid */
- ld [%fp+92],%o4
- /* Do the system call */
- set __NR_clone,%g1
- ta 0x10
- bcs .Lerror
- tst %o1
- bne __thread_start
- nop
- jmpl %i7 + 8, %g0
- restore %o0,%g0,%o0
- .Leinval:
- mov EINVAL, %o0
- .Lerror:
- call __errno_location
- mov %o0, %i0
- st %i0,[%o0]
- jmpl %i7 + 8, %g0
- restore %g0,-1,%o0
- END(__clone)
- .type __thread_start,@function
- __thread_start:
- #ifdef RESET_PID
- sethi %hi(CLONE_THREAD), %l0
- andcc %g4, %l0, %g0
- bne 1f
- andcc %g4, CLONE_VM, %g0
- bne,a 2f
- mov -1,%o0
- set __NR_getpid,%g1
- ta 0x10
- 2:
- st %o0,[%g7 + PID]
- st %o0,[%g7 + TID]
- 1:
- #endif
- mov %g0, %fp /* terminate backtrace */
- call %g2
- mov %g3,%o0
- call exit,0
- nop
- .size __thread_start, .-__thread_start
- weak_alias (__clone, clone)
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