mirror of
https://sourceware.org/git/glibc.git
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179 lines
4.1 KiB
ArmAsm
179 lines
4.1 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, see
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<http://www.gnu.org/licenses/>. */
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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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