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

   1 /* Copyright (C) 1999-2022 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, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <sysdep.h>
  19 #include <features.h>
  20 #include <tls.h>
  21
  22 ENTRY(__syscall_error)
  23 #if RTLD_PRIVATE_ERRNO
  24         /*
  25          * Note that the gp has to be set properly for this to work.
  26          * As long as all syscalls are in the same load unit
  27          * (executable or shared library) as this routine, we should
  28          * be fine.  Otherwise, we would have to first load the global
  29          * pointer register from __gp.
  30          */
  31         addl    r2=@gprel(rtld_errno),gp
  32         ;;
  33         st4     [r2]=r8
  34         mov     r8=-1
  35 #else
  36 # if IS_IN (libc)
  37 #  define SYSCALL_ERROR_ERRNO __libc_errno
  38 # else
  39 #  define SYSCALL_ERROR_ERRNO errno
  40 # endif
  41         addl    r2=@ltoff(@tprel(SYSCALL_ERROR_ERRNO)), gp;;
  42         ld8     r2=[r2]
  43         mov     r3=r8;;
  44         mov     r8=-1
  45         add     r2=r2,r13;;
  46         st4     [r2]=r3
  47 #endif
  48         ret                     // ret is #define'd in syscall.h!
  49 END(__syscall_error)
  50
  51 ENTRY(__ia64_syscall)
  52         mov r15=r37             /* syscall number */
  53         break __IA64_BREAK_SYSCALL
  54         cmp.eq p6,p0=-1,r10     /* r10 = -1 on error */
  55 (p6)    br.cond.spnt.few __syscall_error
  56         ret
  57 PSEUDO_END(__ia64_syscall)