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6c052003bd
2003-09-17 Ulrich Drepper <drepper@redhat.com> * sysdeps/unix/sysv/linux/i386/clone.S: Make sure child gets a stack which is aligned (mod 16).
116 lines
3.0 KiB
ArmAsm
116 lines
3.0 KiB
ArmAsm
/* Copyright (C) 1996,1997,98,99,2000,02,03 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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pid_t *ptid, struct user_desc *tls, pid_t *ctid); */
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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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#define PTID ARG+PTR_SIZE
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#define TLS PTID+PTR_SIZE
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#define CTID TLS+PTR_SIZE
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#define __NR_clone 120
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#define SYS_clone 120
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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. Make sure the new
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thread is started with an alignment of (mod 16). */
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andl $0xfffffff0, %ecx
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subl $24,%ecx
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movl ARG(%esp),%eax /* no negative argument counts */
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movl %eax,12(%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,8(%ecx)
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/* Don't leak any information. */
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movl $0,4(%ecx)
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movl $0,(%ecx)
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/* Do the system call */
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pushl %ebx
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pushl %esi
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pushl %edi
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movl TLS+12(%esp),%esi
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movl PTID+12(%esp),%edx
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movl FLAGS+12(%esp),%ebx
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movl CTID+12(%esp),%edi
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movl $SYS_ify(clone),%eax
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int $0x80
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popl %edi
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popl %esi
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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 L(thread_start)
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L(pseudo_end):
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ret
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L(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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movl %eax, %ebx
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movl $SYS_ify(exit), %eax
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int $0x80
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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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