sysdeps/unix/sysv/linux/am33/socket.S

   1 /* Copyright 2001 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Alexandre Oliva <aoliva@redhat.com>.
   4    Based on ../i386/socket.S.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library.  If not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <sysdep.h>
  21 #include <socketcall.h>
  22
  23 #define P(a, b) P2(a, b)
  24 #define P2(a, b) a##b
  25
  26         .text
  27 /* The socket-oriented system calls are handled unusally in Linux.
  28    They are all gated through the single `socketcall' system call number.
  29    `socketcall' takes two arguments: the first is the subcode, specifying
  30    which socket function is being called; and the second is a pointer to
  31    the arguments to the specific function.
  32
  33    The .S files for the other calls just #define socket and #include this.  */
  34
  35 #ifndef __socket
  36 #ifndef NO_WEAK_ALIAS
  37 #define __socket P(__,socket)
  38 #else
  39 #define __socket socket
  40 #endif
  41 #endif
  42
  43 .globl __socket
  44 ENTRY (__socket)
  45
  46         mov d0,(4,sp)
  47         mov d1,(8,sp)
  48
  49         mov SYS_ify(socketcall),d0      /* System call number in d0.  */
  50
  51         /* Use ## so `socket' is a separate token that might be #define'd.  */
  52         mov P(SOCKOP_,socket),a0        /* Subcode is first arg to syscall.  */
  53         mov sp,d1
  54         add 4,d1                        /* Address of args is 2nd arg.  */
  55
  56         /* Do the system call trap.  */
  57         syscall 0
  58
  59         /* d0 is < 0 if there was an error.  */
  60         cmp -126,d0
  61         bls L(pseudo_end)
  62         jmp SYSCALL_ERROR_LABEL
  63
  64         /* Successful; return the syscall's value.  */
  65 L(pseudo_end):
  66         ret
  67
  68 PSEUDO_END (__socket)
  69
  70 #ifndef NO_WEAK_ALIAS
  71 weak_alias (__socket, socket)
  72 #endif