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1e1dc4e82d
So far accept4 was only supported on archs using socketcall for x86. This patch adds support for the remaining archs.
180 lines
4.2 KiB
ArmAsm
180 lines
4.2 KiB
ArmAsm
/* Copyright (C) 1995-1998,2002,2003,2005, 2008 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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#include <sysdep-cancel.h>
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#include <socketcall.h>
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#include <tls.h>
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#include <kernel-features.h>
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#define EINVAL 22
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#define ENOSYS 38
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#ifdef __ASSUME_ACCEPT4
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# define errlabel SYSCALL_ERROR_LABEL
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#else
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# define errlabel .Lerr
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.data
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have_accept4:
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.long 0
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#endif
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.text
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/* The socket-oriented system calls are handled unusally in Linux/i386.
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They are all gated through the single `socketcall' system call number.
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`socketcall' takes two arguments: the first is the subcode, specifying
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which socket function is being called; and the second is a pointer to
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the arguments to the specific function. */
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.globl __libc_accept4
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ENTRY (__libc_accept4)
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#ifdef CENABLE
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SINGLE_THREAD_P
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jne 1f
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#endif
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/* Save registers. */
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movl %ebx, %edx
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cfi_register (3, 2)
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movl $SYS_ify(socketcall), %eax /* System call number in %eax. */
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movl $SOCKOP_accept4, %ebx /* Subcode is first arg to syscall. */
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lea 4(%esp), %ecx /* Address of args is 2nd arg. */
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/* Do the system call trap. */
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ENTER_KERNEL
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/* Restore registers. */
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movl %edx, %ebx
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cfi_restore (3)
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/* %eax is < 0 if there was an error. */
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cmpl $-125, %eax
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jae errlabel
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/* Successful; return the syscall's value. */
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L(pseudo_end):
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ret
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#ifdef CENABLE
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/* We need one more register. */
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1: pushl %esi
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cfi_adjust_cfa_offset(4)
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/* Enable asynchronous cancellation. */
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CENABLE
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movl %eax, %esi
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cfi_offset(6, -8) /* %esi */
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/* Save registers. */
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movl %ebx, %edx
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cfi_register (3, 2)
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movl $SYS_ify(socketcall), %eax /* System call number in %eax. */
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movl $SOCKOP_accept4, %ebx /* Subcode is first arg to syscall. */
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lea 8(%esp), %ecx /* Address of args is 2nd arg. */
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/* Do the system call trap. */
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ENTER_KERNEL
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/* Restore registers. */
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movl %edx, %ebx
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cfi_restore (3)
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/* Restore the cancellation. */
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xchgl %esi, %eax
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CDISABLE
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/* Restore registers. */
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movl %esi, %eax
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popl %esi
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cfi_restore (6)
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cfi_adjust_cfa_offset(-4)
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/* %eax is < 0 if there was an error. */
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cmpl $-125, %eax
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jae errlabel
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/* Successful; return the syscall's value. */
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ret
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#endif
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#ifndef __ASSUME_ACCEPT4
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/* The kernel returns -EINVAL for unknown socket operations.
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We need to convert that error to an ENOSYS error. */
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.Lerr: cmpl $-EINVAL, %eax
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jne SYSCALL_ERROR_LABEL
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/* Save registers. */
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pushl %ebx
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cfi_adjust_cfa_offset(4)
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cfi_offset(ebx, -8)
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# ifdef PIC
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SETUP_PIC_REG (dx)
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addl $_GLOBAL_OFFSET_TABLE_, %edx
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movl have_accept4@GOTOFF(%edx), %eax
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# else
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movl have_accept4, %eax
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# endif
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testl %eax, %eax
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jne 1f
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/* Try another call, this time with the FLAGS parameter
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cleared and an invalid file descriptor. This call will not
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cause any harm and it will return immediately. */
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movl $-1, 8(%esp)
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movl $0, 20(%esp)
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movl $SYS_ify(socketcall), %eax /* System call number in %eax. */
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movl $SOCKOP_accept4, %ebx /* Subcode is first arg to syscall. */
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lea 8(%esp), %ecx /* Address of args is 2nd arg. */
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/* Do the system call trap. */
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ENTER_KERNEL
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cmpl $-EINVAL, %eax
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movl $-1, %eax
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je 3f
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movl $1, %eax
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3:
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# ifdef PIC
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movl %eax, have_accept4@GOTOFF(%edx)
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# else
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movl %eax, have_accept4
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# endif
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testl %eax, %eax
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1: movl $-EINVAL, %eax
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jns 2f
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movl $-ENOSYS, %eax
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/* Restore registers. */
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2: popl %ebx
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cfi_restore (ebx)
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jmp SYSCALL_ERROR_LABEL
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#endif
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PSEUDO_END (__libc_accept4)
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weak_alias (__libc_accept4, accept4)
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