mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
178 lines
4.1 KiB
ArmAsm
178 lines
4.1 KiB
ArmAsm
/* Copyright (C) 1995-2012 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep-cancel.h>
|
|
#include <socketcall.h>
|
|
#include <tls.h>
|
|
#include <kernel-features.h>
|
|
|
|
#define EINVAL 22
|
|
#define ENOSYS 38
|
|
|
|
#ifdef __ASSUME_ACCEPT4
|
|
# define errlabel SYSCALL_ERROR_LABEL
|
|
#else
|
|
# define errlabel .Lerr
|
|
.data
|
|
have_accept4:
|
|
.long 0
|
|
#endif
|
|
|
|
.text
|
|
/* The socket-oriented system calls are handled unusally in Linux/i386.
|
|
They are all gated through the single `socketcall' system call number.
|
|
`socketcall' takes two arguments: the first is the subcode, specifying
|
|
which socket function is being called; and the second is a pointer to
|
|
the arguments to the specific function. */
|
|
|
|
.globl __libc_accept4
|
|
ENTRY (__libc_accept4)
|
|
#ifdef CENABLE
|
|
SINGLE_THREAD_P
|
|
jne 1f
|
|
#endif
|
|
|
|
/* Save registers. */
|
|
movl %ebx, %edx
|
|
cfi_register (3, 2)
|
|
|
|
movl $SYS_ify(socketcall), %eax /* System call number in %eax. */
|
|
|
|
movl $SOCKOP_accept4, %ebx /* Subcode is first arg to syscall. */
|
|
lea 4(%esp), %ecx /* Address of args is 2nd arg. */
|
|
|
|
/* Do the system call trap. */
|
|
ENTER_KERNEL
|
|
|
|
/* Restore registers. */
|
|
movl %edx, %ebx
|
|
cfi_restore (3)
|
|
|
|
/* %eax is < 0 if there was an error. */
|
|
cmpl $-125, %eax
|
|
jae errlabel
|
|
|
|
/* Successful; return the syscall's value. */
|
|
ret
|
|
|
|
|
|
#ifdef CENABLE
|
|
/* We need one more register. */
|
|
1: pushl %esi
|
|
cfi_adjust_cfa_offset(4)
|
|
|
|
/* Enable asynchronous cancellation. */
|
|
CENABLE
|
|
movl %eax, %esi
|
|
cfi_offset(6, -8) /* %esi */
|
|
|
|
/* Save registers. */
|
|
movl %ebx, %edx
|
|
cfi_register (3, 2)
|
|
|
|
movl $SYS_ify(socketcall), %eax /* System call number in %eax. */
|
|
|
|
movl $SOCKOP_accept4, %ebx /* Subcode is first arg to syscall. */
|
|
lea 8(%esp), %ecx /* Address of args is 2nd arg. */
|
|
|
|
/* Do the system call trap. */
|
|
ENTER_KERNEL
|
|
|
|
/* Restore registers. */
|
|
movl %edx, %ebx
|
|
cfi_restore (3)
|
|
|
|
/* Restore the cancellation. */
|
|
xchgl %esi, %eax
|
|
CDISABLE
|
|
|
|
/* Restore registers. */
|
|
movl %esi, %eax
|
|
popl %esi
|
|
cfi_restore (6)
|
|
cfi_adjust_cfa_offset(-4)
|
|
|
|
/* %eax is < 0 if there was an error. */
|
|
cmpl $-125, %eax
|
|
jae errlabel
|
|
|
|
/* Successful; return the syscall's value. */
|
|
ret
|
|
#endif
|
|
|
|
#ifndef __ASSUME_ACCEPT4
|
|
/* The kernel returns -EINVAL for unknown socket operations.
|
|
We need to convert that error to an ENOSYS error. */
|
|
.Lerr: cmpl $-EINVAL, %eax
|
|
jne SYSCALL_ERROR_LABEL
|
|
|
|
/* Save registers. */
|
|
pushl %ebx
|
|
cfi_adjust_cfa_offset(4)
|
|
cfi_offset(ebx, -8)
|
|
|
|
# ifdef PIC
|
|
SETUP_PIC_REG (dx)
|
|
addl $_GLOBAL_OFFSET_TABLE_, %edx
|
|
movl have_accept4@GOTOFF(%edx), %eax
|
|
# else
|
|
movl have_accept4, %eax
|
|
# endif
|
|
testl %eax, %eax
|
|
jne 1f
|
|
|
|
/* Try another call, this time with the FLAGS parameter
|
|
cleared and an invalid file descriptor. This call will not
|
|
cause any harm and it will return immediately. */
|
|
movl $-1, 8(%esp)
|
|
movl $0, 20(%esp)
|
|
|
|
movl $SYS_ify(socketcall), %eax /* System call number in %eax. */
|
|
|
|
movl $SOCKOP_accept4, %ebx /* Subcode is first arg to syscall. */
|
|
lea 8(%esp), %ecx /* Address of args is 2nd arg. */
|
|
|
|
/* Do the system call trap. */
|
|
ENTER_KERNEL
|
|
|
|
cmpl $-EINVAL, %eax
|
|
movl $-1, %eax
|
|
je 3f
|
|
movl $1, %eax
|
|
3:
|
|
# ifdef PIC
|
|
movl %eax, have_accept4@GOTOFF(%edx)
|
|
# else
|
|
movl %eax, have_accept4
|
|
# endif
|
|
|
|
testl %eax, %eax
|
|
|
|
1: movl $-EINVAL, %eax
|
|
jns 2f
|
|
movl $-ENOSYS, %eax
|
|
|
|
/* Restore registers. */
|
|
2: popl %ebx
|
|
cfi_restore (ebx)
|
|
|
|
jmp SYSCALL_ERROR_LABEL
|
|
#endif
|
|
PSEUDO_END (__libc_accept4)
|
|
|
|
weak_alias (__libc_accept4, accept4)
|