sysdeps/unix/sysv/linux/ia64/sysdep.S

   1 /* Copyright (C) 1999-2018 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by David Mosberger-Tang <davidm@hpl.hp.com>.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <sysdep.h>
  20 #include <features.h>
  21 #include <tls.h>
  22
  23 ENTRY(__syscall_error)
  24 #if RTLD_PRIVATE_ERRNO
  25         /*
  26          * Note that the gp has to be set properly for this to work.
  27          * As long as all syscalls are in the same load unit
  28          * (executable or shared library) as this routine, we should
  29          * be fine.  Otherwise, we would have to first load the global
  30          * pointer register from __gp.
  31          */
  32         addl    r2=@gprel(rtld_errno),gp
  33         ;;
  34         st4     [r2]=r8
  35         mov     r8=-1
  36 #else
  37 # if IS_IN (libc)
  38 #  define SYSCALL_ERROR_ERRNO __libc_errno
  39 # else
  40 #  define SYSCALL_ERROR_ERRNO errno
  41 # endif
  42         addl    r2=@ltoff(@tprel(SYSCALL_ERROR_ERRNO)), gp;;
  43         ld8     r2=[r2]
  44         mov     r3=r8;;
  45         mov     r8=-1
  46         add     r2=r2,r13;;
  47         st4     [r2]=r3
  48 #endif
  49         ret                     // ret is #define'd in syscall.h!
  50 END(__syscall_error)
  51
  52 ENTRY(__ia64_syscall)
  53         mov r15=r37             /* syscall number */
  54         break __BREAK_SYSCALL
  55         cmp.eq p6,p0=-1,r10     /* r10 = -1 on error */
  56 (p6)    br.cond.spnt.few __syscall_error
  57         ret
  58 PSEUDO_END(__ia64_syscall)