sysdeps/unix/sysv/linux/hppa/sysdep.c

   1 /* Copyright (C) 1997, 1998, 2001, 2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <sysdep.h>
  20 #include <errno.h>
  21
  22 extern int __syscall_error(int err_no);
  23 extern int syscall (int sysnum, int arg0, int arg1, int arg2,
  24                     int arg3, int arg4, int arg5);
  25
  26 /* This routine is jumped to by all the syscall handlers, to stash
  27    an error number into errno.  */
  28 int
  29 __syscall_error (int err_no)
  30 {
  31   __set_errno (err_no);
  32   return -1;
  33 }
  34
  35
  36 /* HPPA implements syscall() in 'C'; the assembler version would
  37    typically be in syscall.S. Also note that we have INLINE_SYSCALL,
  38    INTERNAL_SYSCALL, and all the generated pure assembly syscall wrappers.
  39    How often the function is used is unknown. */
  40 int
  41 syscall (int sysnum, int arg0, int arg1, int arg2, int arg3, int arg4,
  42          int arg5)
  43 {
  44   /* FIXME: Keep this matching INLINE_SYSCALL for hppa */
  45   long int __sys_res;
  46   {
  47     register unsigned long int __res asm("r28");
  48     LOAD_ARGS_6 (arg0, arg1, arg2, arg3, arg4, arg5)
  49     asm volatile (STW_ASM_PIC
  50                   "     ble  0x100(%%sr2, %%r0) \n"
  51                   "     copy %1, %%r20          \n"
  52                   LDW_ASM_PIC
  53                   : "=r" (__res)
  54                   : "r" (sysnum) ASM_ARGS_6
  55                   : CALL_CLOB_REGS CLOB_ARGS_6);
  56     __sys_res = __res;
  57   }
  58   if ((unsigned long int) __sys_res >= (unsigned long int) -4095)
  59     {
  60       __set_errno (-__sys_res);
  61       __sys_res = -1;
  62     }
  63   return __sys_res;
  64 }