gas/config/tc-hppa.h

   1 /* tc-hppa.h -- Header file for the PA
   2    Copyright (C) 1989, 93, 94, 95, 96, 97, 98, 99, 2000
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GAS, the GNU Assembler.
   6
   7    GAS is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 1, or (at your option)
  10    any later version.
  11
  12    GAS is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GAS; see the file COPYING.  If not, write to the Free
  19    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20    02111-1307, USA.  */
  21
  22 /* HP PA-RISC support was contributed by the Center for Software Science
  23    at the University of Utah.  */
  24
  25 /* Please refrain from exposing the world to the internals of tc-hppa.c
  26    when this file is included.  This means only declaring exported functions,
  27    (please PARAMize them!) not exporting structures and data items which
  28    are used solely within tc-hppa.c, etc.
  29
  30    Also refrain from adding any more object file dependent code, there is
  31    already far too much object file format dependent code in this file.
  32    In theory this file should contain only exported functions, structures
  33    and data declarations common to all PA assemblers.  */
  34
  35 #ifndef _TC_HPPA_H
  36 #define _TC_HPPA_H
  37
  38 #ifndef TC_HPPA
  39 #define TC_HPPA 1
  40 #endif
  41
  42 #define TARGET_BYTES_BIG_ENDIAN 1
  43
  44 #define TARGET_ARCH bfd_arch_hppa
  45
  46 #define WORKING_DOT_WORD
  47
  48 #ifdef OBJ_ELF
  49 #if TARGET_ARCH_SIZE == 64
  50 #include "bfd/elf64-hppa.h"
  51 #define TARGET_FORMAT "elf64-hppa"
  52 #else
  53 #include "bfd/elf32-hppa.h"
  54 #define TARGET_FORMAT "elf32-hppa"
  55 #endif
  56 #endif
  57
  58 #ifdef OBJ_SOM
  59 #include "bfd/som.h"
  60 #define TARGET_FORMAT "som"
  61 #endif
  62
  63 #ifdef TE_LINUX
  64 /* Define to compile in an extra assembler option, -c, which enables a
  65    warning (once per file) when a comment is encountered.
  66    The hppa comment char is a `;' which tends to occur in random C asm
  67    statements.  A semicolon is a line separator for most assemblers.
  68    It's hard to find these lurking semicolons.  Thus...  */
  69 #define WARN_COMMENTS 1
  70 #endif
  71
  72 /* FIXME.  Why oh why aren't these defined somewhere globally?  */
  73 #ifndef FALSE
  74 #define FALSE   (0)
  75 #define TRUE    (!FALSE)
  76 #endif
  77
  78 #define ASEC_NULL (asection *)0
  79
  80 /* pa_define_label gets used outside of tc-hppa.c via tc_frob_label.  */
  81 extern void pa_define_label PARAMS ((symbolS *));
  82
  83 extern void parse_cons_expression_hppa PARAMS ((expressionS *));
  84 extern void cons_fix_new_hppa PARAMS ((fragS *, int, int, expressionS *));
  85 extern int hppa_force_relocation PARAMS ((struct fix *));
  86
  87 /* This gets called before writing the object file to make sure
  88    things like entry/exit and proc/procend pairs match.  */
  89 extern void pa_check_eof PARAMS ((void));
  90 #define tc_frob_file pa_check_eof
  91
  92 #define tc_frob_label(sym) pa_define_label (sym)
  93
  94 /* The PA does not need support for either of these.  */
  95 #define tc_crawl_symbol_chain(headers) {;}
  96 #define tc_headers_hook(headers) {;}
  97
  98 #define RELOC_EXPANSION_POSSIBLE
  99 #define MAX_RELOC_EXPANSION 6
 100
 101 /* The PA needs to parse field selectors in .byte, etc.  */
 102
 103 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) \
 104   parse_cons_expression_hppa (EXP)
 105 #define TC_CONS_FIX_NEW cons_fix_new_hppa
 106
 107 /* On the PA, an equal sign often appears as a condition or nullification
 108    completer in an instruction.  This can be detected by checking the
 109    previous character, if the character is a comma, then the equal is
 110    being used as part of an instruction.  */
 111 #define TC_EQUAL_IN_INSN(C, PTR)        ((C) == ',')
 112
 113 /* Similarly for an exclamation point.  It is used in FP comparison
 114    instructions and as an end of line marker.  When used in an instruction
 115    it will always follow a comma.  */
 116 #define TC_EOL_IN_INSN(PTR)     (*(PTR) == '!' && (PTR)[-1] == ',')
 117
 118 int hppa_fix_adjustable PARAMS((struct fix *));
 119 #define tc_fix_adjustable hppa_fix_adjustable
 120
 121 /* Because of the strange PA calling conventions, it is sometimes
 122    necessary to emit a relocation for a call even though it would
 123    normally appear safe to handle it completely within GAS.  */
 124 #define TC_FORCE_RELOCATION(FIXP) hppa_force_relocation (FIXP)
 125
 126 #ifdef OBJ_SOM
 127 /* If a symbol is imported, but never used, then the symbol should
 128    *not* end up in the symbol table.  Likewise for absolute symbols
 129    with local scope.  */
 130 #define tc_frob_symbol(sym,punt) \
 131     if ((S_GET_SEGMENT (sym) == &bfd_und_section && ! symbol_used_p (sym)) \
 132         || (S_GET_SEGMENT (sym) == &bfd_abs_section \
 133             && ! S_IS_EXTERNAL (sym))) \
 134       punt = 1
 135
 136 /* We need to be able to make relocations involving the difference of
 137    two symbols.  This includes the difference of two symbols when
 138    one of them is undefined (this comes up in PIC code generation).
 139
 140    We don't define DIFF_EXPR_OK because it does the wrong thing if
 141    the add symbol is undefined and the sub symbol is a symbol in
 142    the same section as the relocation.  We also need some way to
 143    specialize some code in adjust_reloc_syms.  */
 144 #define UNDEFINED_DIFFERENCE_OK
 145 #endif
 146
 147 #ifdef OBJ_ELF
 148 /* It's OK to subtract two symbols in the same section without
 149    emitting a relocation.  */
 150 #define TC_FORCE_RELOCATION_SECTION(FIXP, SEC) 0
 151
 152 /* Handle .type psuedo.  Given a type string of `millicode', set the
 153    internal elf symbol type to STT_PARISC_MILLI, and return
 154    BSF_FUNCTION for the BFD symbol type.  */
 155 #define md_elf_symbol_type(name, sym, elf)                              \
 156   ((strcmp ((name), "millicode") == 0                                   \
 157     || strcmp ((name), "STT_PARISC_MILLI") == 0)                        \
 158    ? (((elf)->internal_elf_sym.st_info = ELF_ST_INFO                    \
 159        (ELF_ST_BIND ((elf)->internal_elf_sym.st_info), STT_PARISC_MILLI)\
 160        ), BSF_FUNCTION)                                                 \
 161    : -1)
 162
 163 #define tc_frob_symbol(sym,punt) \
 164   { \
 165     if ((S_GET_SEGMENT (sym) == &bfd_und_section && ! symbol_used_p (sym)) \
 166         || (S_GET_SEGMENT (sym) == &bfd_abs_section \
 167             && ! S_IS_EXTERNAL (sym)) \
 168         || strcmp (S_GET_NAME (sym), "$global$") == 0 \
 169         || strcmp (S_GET_NAME (sym), "$PIC_pcrel$0") == 0) \
 170       punt = 1; \
 171   }
 172
 173 #define elf_tc_final_processing elf_hppa_final_processing
 174 void elf_hppa_final_processing PARAMS ((void));
 175
 176 #define DWARF2_LINE_MIN_INSN_LENGTH 4
 177 #endif /* OBJ_ELF */
 178
 179 #define md_operand(x)
 180
 181 /* Allow register expressions to be treated as absolute expressions.
 182    A silly fudge required for backwards compatibility.  */
 183 #define md_optimize_expr hppa_force_reg_syms_absolute
 184
 185 int hppa_force_reg_syms_absolute
 186   PARAMS ((expressionS *, operatorT, expressionS *));
 187
 188 #define TC_FIX_TYPE PTR
 189 #define TC_INIT_FIX_DATA(FIXP) ((FIXP)->tc_fix_data = NULL)
 190
 191 #endif /* _TC_HPPA_H */