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- /* Copyright (C) 1996, 1997, 1998, 1999 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 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., 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 <sysdep.h>
- #define _ERRNO_H 1
- #include <bits/errno.h>
- #include <asm-syntax.h>
- /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
- .text
- ENTRY(__clone)
- /* Sanity check arguments. */
- movl $-EINVAL,%eax
- movl 4(%esp),%ecx /* no NULL function pointers */
- #ifdef PIC
- jecxz SYSCALL_ERROR_LABEL
- #else
- testl %ecx,%ecx
- jz SYSCALL_ERROR_LABEL
- #endif
- movl 8(%esp),%ecx /* no NULL stack pointers */
- #ifdef PIC
- jecxz SYSCALL_ERROR_LABEL
- #else
- testl %ecx,%ecx
- jz SYSCALL_ERROR_LABEL
- #endif
- /* Insert the argument onto the new stack. */
- subl $8,%ecx
- movl 16(%esp),%eax /* no negative argument counts */
- 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 $SYS_ify(clone),%eax
- int $0x80
- popl %ebx
- test %eax,%eax
- jl SYSCALL_ERROR_LABEL
- jz thread_start
- L(pseudo_end):
- ret
- thread_start:
- subl %ebp,%ebp /* terminate the stack frame */
- call *%ebx
- #ifdef PIC
- call L(here)
- L(here):
- popl %ebx
- addl $_GLOBAL_OFFSET_TABLE_+[.-L(here)], %ebx
- #endif
- pushl %eax
- call JUMPTARGET (_exit)
- PSEUDO_END (__clone)
- weak_alias (__clone, clone)
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