summaryrefslogtreecommitdiff
path: root/libc
diff options
context:
space:
mode:
Diffstat (limited to 'libc')
-rw-r--r--libc/sysdeps/linux/i386/clone.S123
1 files changed, 84 insertions, 39 deletions
diff --git a/libc/sysdeps/linux/i386/clone.S b/libc/sysdeps/linux/i386/clone.S
index 93183d208..d18d4edc2 100644
--- a/libc/sysdeps/linux/i386/clone.S
+++ b/libc/sysdeps/linux/i386/clone.S
@@ -1,75 +1,122 @@
-/* Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
+/* Copyright (C) 1996, 1997,98,99,2000,02 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.
+ 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
- Library General Public License for more details.
+ Lesser 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. */
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; 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. */
+ and invokes a function in the right context after its all over.
+
+ Hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
+*/
+#define _ERRNO_H 1
#include <bits/errno.h>
#include <sys/syscall.h>
-.text
-.align 4
-.type __clone,@function
-.globl __clone;
+#define LINKAGE 4
+#define PTR_SIZE 4
+#define PARMS LINKAGE /* no space for saved regs */
+#define FUNC PARMS
+#define STACK FUNC+4
+#define FLAGS STACK+PTR_SIZE
+#define ARG FLAGS+4
+#define PTID ARG+PTR_SIZE
+#define TLS PTID+PTR_SIZE
+#define CTID TLS+PTR_SIZE
+
+
+ .text
+ .globl __clone;
+ .type __clone,@function;
+ .align 1<<4;
+
__clone:
/* Sanity check arguments. */
- movl 4(%esp),%ecx /* no NULL function pointers */
- jecxz CLONE_ERROR_LABEL
-
- movl 8(%esp),%ecx /* no NULL stack pointers */
- jecxz CLONE_ERROR_LABEL
+ movl $-EINVAL,%eax
+ movl FUNC(%esp),%ecx /* no NULL function pointers */
+#ifdef __PIC__
+ jecxz __syscall_error
+#else
+ testl %ecx,%ecx
+ jz __syscall_error
+#endif
+ movl STACK(%esp),%ecx /* no NULL stack pointers */
+#ifdef __PIC__
+ jecxz __syscall_error
+#else
+ testl %ecx,%ecx
+ jz __syscall_error
+#endif
/* Insert the argument onto the new stack. */
- subl $8,%ecx
- movl 16(%esp),%eax /* no negative argument counts */
- movl %eax,4(%ecx)
+ subl $16,%ecx
+ movl ARG(%esp),%eax /* no negative argument counts */
+ movl %eax,12(%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)
+ movl FUNC(%esp),%eax
+ movl %eax,8(%ecx)
+ /* Don't leak any information. */
+ movl $0,4(%ecx)
+ movl $0,(%ecx)
/* Do the system call */
pushl %ebx
- movl 16(%esp),%ebx
+ pushl %esi
+ pushl %edi
+ movl TLS+12(%esp),%esi
+ movl PTID+12(%esp),%edx
+ movl FLAGS+12(%esp),%ebx
+ movl CTID+12(%esp),%edi
movl $__NR_clone,%eax
int $0x80
+ popl %edi
+ popl %esi
popl %ebx
test %eax,%eax
- jl CLONE_ERROR_LABEL
- jne CLONE_RETURN_LABEL
+ jl __syscall_error
+ jz .Lthread_start
- /* Start thread */
+.Lpseudo_end:
+ ret
+
+.Lthread_start:
subl %ebp,%ebp /* terminate the stack frame */
call *%ebx
- pushl %eax
- call _exit
+#ifdef __PIC__
+ call .Lhere
+.Lhere:
+ popl %ebx
+ addl $_GLOBAL_OFFSET_TABLE_+[.-.Lhere], %ebx
+#endif
+ movl %eax, %ebx
+ movl $__NR_exit, %eax
+ int $0x80
-CLONE_ERROR_LABEL:
+__syscall_error:
negl %eax
pushl %eax
#ifdef __PIC__
- call .Lhere
-.Lhere:
+ call .Lthere
+.Lthere:
popl %ebx
- addl $_GLOBAL_OFFSET_TABLE_+[.- .Lhere ], %ebx
+ addl $_GLOBAL_OFFSET_TABLE_+[.- .Lthere ], %ebx
call __errno_location@PLT
#else
call __errno_location
@@ -79,9 +126,7 @@ CLONE_ERROR_LABEL:
xorl %eax, %eax
decl %eax
-CLONE_RETURN_LABEL:
- ret
-
-.globl clone;
- clone = __clone
+.Lsize:
+ .size __clone,.Lsize-__clone
+.weak clone ; clone = __clone