clone.S
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上传用户:sun1608
上传日期:2007-02-02
资源大小:6116k
文件大小:5k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /* Taken with thanks from LinuxThreads 0.6 */
- /* This is no longer necessary with glibc-2.1, which has it's own clone() */
- #ifdef linux
- /* Look to see if glibc is available, and if so, what version */
- #include <features.h>
- #if (__GLIBC__ > 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 1))
- #define HAVE_CLONE
- #endif /* glibc 2.1 or newer */
- #endif /* linux */
- #if defined(linux) && !defined(SDL_USE_PTHREADS) && !defined(HAVE_CLONE)
- #if defined(__i386__)
- /************************************************************************/
- /* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
- 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 Library General Public License as
- published by the Free Software Foundation; either version 2 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
- Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, write to the Free Software Foundation, Inc., 675 Mass Ave,
- #ifdef SAVE_RCSID
- static char rcsid =
- "@(#) $Id: clone.S,v 1.4 2002/04/22 21:38:03 wmay Exp $";
- #endif
- Cambridge, MA 02139, 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 <asm/errno.h>
- #include <asm/unistd.h>
- /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
- .text
- .align 4
- .globl __clone
- .type __clone,@function
- .weak clone
- clone = __clone
- __clone:
- /* Sanity check arguments. */
- movl $-EINVAL,%eax
- movl 4(%esp),%ecx /* no NULL function pointers */
- testl %ecx,%ecx
- jz syscall_error
- movl 8(%esp),%ecx /* no NULL stack pointers */
- testl %ecx,%ecx
- jz syscall_error
- /* Insert the argument onto the new stack. */
- subl $8,%ecx
- movl 16(%esp),%eax
- movl %eax,4(%ecx)
- /* Save the function pointer as the zeroth argument. */
- /* It will be popped off in the child in the ebx frobbing below. */
- movl 4(%esp),%eax
- movl %eax,0(%ecx)
- /* Do the system call */
- pushl %ebx
- movl 16(%esp),%ebx
- movl $__NR_clone,%eax
- int $0x80
- popl %ebx
- test %eax,%eax
- jl syscall_error
- jz thread_start
- ret
- syscall_error:
- negl %eax
- pushl %eax
- #ifdef __PIC__
- call __errno_location@PLT
- #else
- call __errno_location
- #endif
- popl 0(%eax)
- movl $-1, %eax
- ret
- thread_start:
- subl %ebp,%ebp /* terminate the stack frame */
- call *%ebx
- pushl %eax
- #ifdef __PIC__
- call _exit@PLT
- #else
- call _exit
- #endif
- /************************************************************************/
- #elif defined(sparc)
- /************************************************************************/
- /* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
- Contributed by Miguel de Icaza (miguel@nuclecu.unam.mx)
- Based on code written for the Intel 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 Library General Public License as
- published by the Free Software Foundation; either version 2 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
- Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, write to the Free Software Foundation, Inc., 675 Mass Ave,
- Cambridge, MA 02139, 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 <asm/errno.h>
- #include <asm/unistd.h>
- /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
- .text
- .align 4
- .globl __clone
- .type __clone,@function
- .weak clone
- clone = __clone
- __clone:
- save %sp,-96,%sp
- /* sanity check arguments */
- tst %i0
- be __clone_syscall_error
- tst %i1
- be __clone_syscall_error
- nop
- /* Do the system call */
- mov %i1,%o1
- mov %i2,%o0
- set __NR_clone,%g1
- ta 0x10
- bcs __clone_syscall_error
- tst %o1
- bne __thread_start
- nop
- mov %o0,%i0
- ret
- restore
- __clone_syscall_error:
- call __errno_location
- set EINVAL,%i0
- st %i0,[%o0]
- mov -1,%i0
- ret
- restore
- __thread_start:
- call %i0
- mov %i3,%o0
- call _exit,0
- nop
- /************************************************************************/
- #else
- #error "Unknown Linux architecture"
- #endif
- #endif /* Linux && ! SDL_USE_PTHREADS */