1  /* System-specific settings for dynamic linker code.  IA-64 version.
       2     Copyright (C) 2003-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       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     <https://www.gnu.org/licenses/>.  */
      18  
      19  #ifndef _LINUX_IA64_DL_SYSDEP_H
      20  #define _LINUX_IA64_DL_SYSDEP_H	1
      21  
      22  #include_next <dl-sysdep.h>
      23  
      24  /* Traditionally system calls have been made using break 0x100000.  A
      25     second method was introduced which, if possible, will use the EPC
      26     instruction.  To signal the presence and where to find the code the
      27     kernel passes an AT_SYSINFO_EHDR pointer in the auxiliary vector to
      28     the application.  */
      29  #define NEED_DL_SYSINFO	1
      30  #define USE_DL_SYSINFO	1
      31  
      32  #ifndef __ASSEMBLER__
      33  /* Don't declare this as a function---we want it's entry-point, not
      34     it's function descriptor... */
      35  extern int _dl_sysinfo_break attribute_hidden;
      36  # define DL_SYSINFO_DEFAULT ((uintptr_t) &_dl_sysinfo_break)
      37  # define DL_SYSINFO_IMPLEMENTATION		\
      38    asm (".text\n\t"				\
      39         ".hidden _dl_sysinfo_break\n\t"		\
      40         ".proc _dl_sysinfo_break\n\t"		\
      41         "_dl_sysinfo_break:\n\t"			\
      42         ".prologue\n\t"				\
      43         ".altrp b6\n\t"				\
      44         ".body\n\t"				\
      45         "break 0x100000;\n\t"			\
      46         "br.ret.sptk.many b6;\n\t"		\
      47         ".endp _dl_sysinfo_break\n\t"		\
      48         ".previous");
      49  #endif
      50  
      51  #endif	/* dl-sysdep.h */