gcc/config/pa/pa32-linux.h

   1 /* Definitions for PA_RISC with ELF-32 format
   2    Copyright (C) 2000-2023 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 /* Turn off various SOM crap we don't want.  */
  21 #undef TARGET_ELF32
  22 #define TARGET_ELF32 1
  23
  24 /* The libcall __canonicalize_funcptr_for_compare is referenced in
  25    crtend.o and the reference isn't resolved in objects that don't
  26    compare function pointers.  Thus, we need to play games to provide
  27    a reference in crtbegin.o.  The rest of the define is the same
  28    as that in crtstuff.c  */
  29 #define CTOR_LIST_BEGIN \
  30   asm (".type __canonicalize_funcptr_for_compare,@function\n"           \
  31 "       .text\n"                                                        \
  32 "       .word __canonicalize_funcptr_for_compare-$PIC_pcrel$0");        \
  33   STATIC func_ptr __CTOR_LIST__[1]                                      \
  34     __attribute__ ((__used__, section(".ctors"),                        \
  35                     aligned(sizeof(func_ptr))))                         \
  36     = { (func_ptr) (-1) }
  37
  38 /* This is a PIC version of CRT_CALL_STATIC_FUNCTION.  The PIC
  39    register has to be saved before the call and restored after
  40    the call.  We assume that register %r4 is available for this
  41    purpose.  The hack prevents GCC from deleting the restore.  */
  42 #ifdef CRTSTUFFS_O
  43 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)      \
  44 static void __attribute__((__used__))                   \
  45 call_ ## FUNC (void)                                    \
  46 {                                                       \
  47   asm (SECTION_OP);                                     \
  48   asm volatile ("bl " #FUNC ",%%r2\n\t"                 \
  49                 "copy %%r19,%%r4\n\t"                   \
  50                 "copy %%r4,%%r19\n"                     \
  51                 :                                       \
  52                 :                                       \
  53                 : "r1", "r2", "r4", "r20", "r21",       \
  54                   "r22", "r23", "r24", "r25", "r26",    \
  55                   "r27", "r28", "r29", "r31");          \
  56   asm (TEXT_SECTION_ASM_OP);                            \
  57 }
  58 #endif
  59
  60 /* We need to link against libgcc.a for __canonicalize_funcptr_for_compare
  61    and $$dyncall.  */
  62 #undef  ENDFILE_SPEC
  63 #define ENDFILE_SPEC GNU_USER_TARGET_ENDFILE_SPEC "libgcc.a%s"
  64
  65 #undef  WCHAR_TYPE
  66 #define WCHAR_TYPE "long int"
  67
  68 #undef  WCHAR_TYPE_SIZE
  69 #define WCHAR_TYPE_SIZE BITS_PER_WORD
  70
  71 /* Place jump tables in the text section except when generating non-PIC
  72    code.  When generating non-PIC code, the relocations needed to load the
  73    address of the jump table result in a text label in the final executable
  74    if the jump table is placed in the text section.  This breaks the unwind
  75    data for the function.  Thus, the jump table needs to be placed in
  76    rodata when generating non-PIC code.  */
  77 #undef JUMP_TABLES_IN_TEXT_SECTION
  78 #define JUMP_TABLES_IN_TEXT_SECTION (flag_pic)
  79
  80 /* We need to override default selection to put references to functions
  81    in COMDAT groups in .data.rel.ro.local.  */
  82 #undef TARGET_ASM_SELECT_RTX_SECTION
  83 #define TARGET_ASM_SELECT_RTX_SECTION pa_elf_select_rtx_section