gas/config/tc-mips.h

   1 /* tc-mips.h -- header file for tc-mips.c.
   2    Copyright 1993, 1994, 1995, 1996, 1997, 2000, 2001, 2002, 2003
   3    Free Software Foundation, Inc.
   4    Contributed by the OSF and Ralph Campbell.
   5    Written by Keith Knowles and Ralph Campbell, working independently.
   6    Modified for ECOFF support by Ian Lance Taylor of Cygnus Support.
   7
   8    This file is part of GAS.
   9
  10    GAS is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2, or (at your option)
  13    any later version.
  14
  15    GAS is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with GAS; see the file COPYING.  If not, write to the Free
  22    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  23    02111-1307, USA.  */
  24
  25 #ifndef TC_MIPS
  26
  27 #define TC_MIPS
  28
  29 #ifdef ANSI_PROTOTYPES
  30 struct frag;
  31 struct expressionS;
  32 #endif
  33
  34 /* Default to big endian.  */
  35 #ifndef TARGET_BYTES_BIG_ENDIAN
  36 #define TARGET_BYTES_BIG_ENDIAN         1
  37 #endif
  38
  39 #define TARGET_ARCH bfd_arch_mips
  40
  41 #define WORKING_DOT_WORD        1
  42 #define OLD_FLOAT_READS
  43 #define REPEAT_CONS_EXPRESSIONS
  44 #define RELOC_EXPANSION_POSSIBLE
  45 #define MAX_RELOC_EXPANSION 3
  46 #define LOCAL_LABELS_FB 1
  47
  48 /* Maximum symbol offset that can be encoded in a BFD_RELOC_GPREL16
  49    relocation.  */
  50 #define MAX_GPREL_OFFSET (0x7FF0)
  51
  52 #define md_relax_frag(segment, fragp, stretch) \
  53   mips_relax_frag(segment, fragp, stretch)
  54 extern int mips_relax_frag PARAMS ((asection *, struct frag *, long));
  55
  56 #define md_undefined_symbol(name)       (0)
  57 #define md_operand(x)
  58
  59 extern void mips_handle_align PARAMS ((struct frag *));
  60 #define HANDLE_ALIGN(fragp)  mips_handle_align (fragp)
  61
  62 #define MAX_MEM_FOR_RS_ALIGN_CODE  (1 + 2)
  63
  64 /* We permit PC relative difference expressions when generating
  65    embedded PIC code.  */
  66 #define DIFF_EXPR_OK
  67
  68 /* Tell assembler that we have an itbl_mips.h header file to include.  */
  69 #define HAVE_ITBL_CPU
  70
  71 /* The endianness of the target format may change based on command
  72    line arguments.  */
  73 #define TARGET_FORMAT mips_target_format()
  74 extern const char *mips_target_format PARAMS ((void));
  75
  76 /* MIPS PIC level.  */
  77
  78 enum mips_pic_level
  79 {
  80   /* Do not generate PIC code.  */
  81   NO_PIC,
  82
  83   /* Generate PIC code as in the SVR4 MIPS ABI.  */
  84   SVR4_PIC,
  85
  86   /* Generate PIC code without using a global offset table: the data
  87      segment has a maximum size of 64K, all data references are off
  88      the $gp register, and all text references are PC relative.  This
  89      is used on some embedded systems.  */
  90   EMBEDDED_PIC
  91 };
  92
  93 extern enum mips_pic_level mips_pic;
  94
  95 struct mips_cl_insn
  96 {
  97   unsigned long insn_opcode;
  98   const struct mips_opcode *insn_mo;
  99   /* The next two fields are used when generating mips16 code.  */
 100   bfd_boolean use_extend;
 101   unsigned short extend;
 102 };
 103
 104 extern int tc_get_register PARAMS ((int frame));
 105
 106 #define md_after_parse_args() mips_after_parse_args()
 107 extern void mips_after_parse_args PARAMS ((void));
 108
 109 #define tc_init_after_args() mips_init_after_args()
 110 extern void mips_init_after_args PARAMS ((void));
 111
 112 #define md_parse_long_option(arg) mips_parse_long_option (arg)
 113 extern int mips_parse_long_option PARAMS ((const char *));
 114
 115 #define tc_frob_label(sym) mips_define_label (sym)
 116 extern void mips_define_label PARAMS ((symbolS *));
 117
 118 #define tc_frob_file_before_adjust() mips_frob_file_before_adjust ()
 119 extern void mips_frob_file_before_adjust PARAMS ((void));
 120
 121 #define tc_frob_file_before_fix() mips_frob_file ()
 122 extern void mips_frob_file PARAMS ((void));
 123
 124 #if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF)
 125 #define tc_frob_file_after_relocs mips_frob_file_after_relocs
 126 extern void mips_frob_file_after_relocs PARAMS ((void));
 127 #endif
 128
 129 #define tc_fix_adjustable(fixp) mips_fix_adjustable (fixp)
 130 extern int mips_fix_adjustable PARAMS ((struct fix *));
 131
 132 /* Values passed to md_apply_fix3 don't include symbol values.  */
 133 #define MD_APPLY_SYM_VALUE(FIX) 0
 134
 135 /* Global syms must not be resolved, to support ELF shared libraries.
 136    When generating embedded code, we don't have shared libs.  */
 137 #define EXTERN_FORCE_RELOC                      \
 138   (OUTPUT_FLAVOR == bfd_target_elf_flavour      \
 139    && mips_pic != EMBEDDED_PIC)
 140
 141 /* When generating embedded PIC code we must keep PC relative
 142    relocations.  */
 143 #define TC_FORCE_RELOCATION(FIX) mips_force_relocation (FIX)
 144 extern int mips_force_relocation PARAMS ((struct fix *));
 145
 146 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \
 147   (! SEG_NORMAL (SEG) || mips_force_relocation (FIX))
 148
 149 /* We use this to turn branches to global symbols into branches to
 150    local symbols, so that they can be simplified.  */
 151 #define TC_VALIDATE_FIX(fixp, this_segment, skip_label) \
 152   do \
 153     if (! mips_validate_fix ((fixp), (this_segment))) \
 154       goto skip_label; \
 155   while (0)
 156 extern int mips_validate_fix PARAMS ((struct fix *, asection *));
 157
 158 /* Register mask variables.  These are set by the MIPS assembly code
 159    and used by ECOFF and possibly other object file formats.  */
 160 extern unsigned long mips_gprmask;
 161 extern unsigned long mips_cprmask[4];
 162
 163 #if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF)
 164
 165 #define elf_tc_final_processing mips_elf_final_processing
 166 extern void mips_elf_final_processing PARAMS ((void));
 167
 168 #define ELF_TC_SPECIAL_SECTIONS \
 169   { ".sdata",   SHT_PROGBITS,   SHF_ALLOC + SHF_WRITE + SHF_MIPS_GPREL  }, \
 170   { ".sbss",    SHT_NOBITS,     SHF_ALLOC + SHF_WRITE + SHF_MIPS_GPREL  }, \
 171   { ".lit4",    SHT_PROGBITS,   SHF_ALLOC + SHF_WRITE + SHF_MIPS_GPREL  }, \
 172   { ".lit8",    SHT_PROGBITS,   SHF_ALLOC + SHF_WRITE + SHF_MIPS_GPREL  }, \
 173   { ".ucode",   SHT_MIPS_UCODE, 0                                       }, \
 174   { ".mdebug",  SHT_MIPS_DEBUG, 0                                       },
 175 /* Other special sections not generated by the assembler: .reginfo,
 176    .liblist, .conflict, .gptab, .got, .dynamic, .rel.dyn.  */
 177
 178 #endif
 179
 180 extern void md_mips_end PARAMS ((void));
 181 #define md_end()        md_mips_end()
 182
 183 #define USE_GLOBAL_POINTER_OPT  (OUTPUT_FLAVOR == bfd_target_ecoff_flavour \
 184                                  || OUTPUT_FLAVOR == bfd_target_coff_flavour \
 185                                  || OUTPUT_FLAVOR == bfd_target_elf_flavour)
 186
 187 extern void mips_pop_insert PARAMS ((void));
 188 #define md_pop_insert()         mips_pop_insert()
 189
 190 extern void mips_flush_pending_output PARAMS ((void));
 191 #define md_flush_pending_output mips_flush_pending_output
 192
 193 extern void mips_enable_auto_align PARAMS ((void));
 194 #define md_elf_section_change_hook()    mips_enable_auto_align()
 195
 196 extern enum dwarf2_format mips_dwarf2_format PARAMS ((void));
 197 #define DWARF2_FORMAT() mips_dwarf2_format ()
 198
 199 #define DWARF2_ADDR_SIZE(bfd) \
 200   (DWARF2_FORMAT () == dwarf2_format_32bit ? 4 : 8)
 201
 202 typedef struct {
 203   offsetT tc_fr_offset;
 204 } tc_frag_data_type;
 205 #define TC_FRAG_TYPE tc_frag_data_type
 206
 207 #endif /* TC_MIPS */