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41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
96 lines
2.5 KiB
ArmAsm
96 lines
2.5 KiB
ArmAsm
/* Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson (rth@tamu.edu)
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* clone() is even more special than fork() as it mucks with stacks
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and invokes a function in the right context after its all over. */
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#include <sysdep.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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#include <asm-syntax.h>
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#include <bp-sym.h>
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#include <bp-asm.h>
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/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
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#define PARMS LINKAGE /* no space for saved regs */
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#define FUNC PARMS
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#define STACK FUNC+4
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#define FLAGS STACK+PTR_SIZE
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#define ARG FLAGS+4
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.text
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ENTRY (BP_SYM (__clone))
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/* Sanity check arguments. */
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movl $-EINVAL,%eax
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movl FUNC(%esp),%ecx /* no NULL function pointers */
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#ifdef PIC
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jecxz SYSCALL_ERROR_LABEL
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#else
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testl %ecx,%ecx
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jz SYSCALL_ERROR_LABEL
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#endif
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movl STACK(%esp),%ecx /* no NULL stack pointers */
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#ifdef PIC
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jecxz SYSCALL_ERROR_LABEL
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#else
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testl %ecx,%ecx
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jz SYSCALL_ERROR_LABEL
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#endif
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/* Insert the argument onto the new stack. */
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subl $8,%ecx
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movl ARG(%esp),%eax /* no negative argument counts */
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movl %eax,4(%ecx)
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/* Save the function pointer as the zeroth argument.
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It will be popped off in the child in the ebx frobbing below. */
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movl FUNC(%esp),%eax
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movl %eax,0(%ecx)
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/* Do the system call */
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pushl %ebx
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movl FLAGS+4(%esp),%ebx
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movl $SYS_ify(clone),%eax
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int $0x80
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popl %ebx
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test %eax,%eax
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jl SYSCALL_ERROR_LABEL
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jz thread_start
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L(pseudo_end):
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ret
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thread_start:
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subl %ebp,%ebp /* terminate the stack frame */
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call *%ebx
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#ifdef PIC
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call L(here)
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L(here):
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popl %ebx
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addl $_GLOBAL_OFFSET_TABLE_+[.-L(here)], %ebx
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#endif
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pushl %eax
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call JUMPTARGET (_exit)
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PSEUDO_END (BP_SYM (__clone))
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weak_alias (BP_SYM (__clone), BP_SYM (clone))
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