gcc/config/pa/pa64-linux.h

   1 /* Definitions for PA_RISC with ELF format on 64-bit Linux
   2    Copyright (C) 1999-2023 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  11 GCC 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
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 /* 64-bit ELF target.  */
  21 #undef TARGET_ELF64
  22 #define TARGET_ELF64 1
  23
  24 #if 0 /* needs some work :-( */
  25 /* If defined, this macro specifies a table of register pairs used to
  26    eliminate unneeded registers that point into the stack frame.  */
  27
  28 #define ELIMINABLE_REGS                                                 \
  29 {                                                                       \
  30   {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM},                         \
  31   {ARG_POINTER_REGNUM,   STACK_POINTER_REGNUM},                         \
  32   {ARG_POINTER_REGNUM,   FRAME_POINTER_REGNUM},                         \
  33 }
  34
  35 /* This macro returns the initial difference between the specified pair
  36    of registers.  */
  37 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
  38   do                                                            \
  39     {                                                           \
  40       int fsize;                                                \
  41                                                                 \
  42       fsize = pa_compute_frame_size (get_frame_size (), 0);     \
  43       if ((TO) == FRAME_POINTER_REGNUM                          \
  44           && (FROM) == ARG_POINTER_REGNUM)                      \
  45         {                                                       \
  46           (OFFSET) = -16;                                       \
  47           break;                                                \
  48         }                                                       \
  49                                                                 \
  50       gcc_assert ((TO) == STACK_POINTER_REGNUM);                \
  51                                                                 \
  52       switch (FROM)                                             \
  53         {                                                       \
  54         case FRAME_POINTER_REGNUM:                              \
  55           (OFFSET) = - fsize;                                   \
  56           break;                                                \
  57                                                                 \
  58         case ARG_POINTER_REGNUM:                                \
  59           (OFFSET) = - fsize - 16;                              \
  60           break;                                                \
  61                                                                 \
  62         default:                                                \
  63           gcc_unreachable ();                                   \
  64         }                                                       \
  65     } while (0)
  66 #endif