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 #define TC_MIPS
  27
  28 struct frag;
  29 struct expressionS;
  30
  31 /* Default to big endian.  */
  32 #ifndef TARGET_BYTES_BIG_ENDIAN
  33 #define TARGET_BYTES_BIG_ENDIAN         1
  34 #endif
  35
  36 #define TARGET_ARCH bfd_arch_mips
  37
  38 #define WORKING_DOT_WORD        1
  39 #define OLD_FLOAT_READS
  40 #define REPEAT_CONS_EXPRESSIONS
  41 #define RELOC_EXPANSION_POSSIBLE
  42 #define MAX_RELOC_EXPANSION 3
  43 #define LOCAL_LABELS_FB 1
  44
  45 /* Maximum symbol offset that can be encoded in a BFD_RELOC_GPREL16
  46    relocation.  */
  47 #define MAX_GPREL_OFFSET (0x7FF0)
  48
  49 #define md_relax_frag(segment, fragp, stretch) \
  50   mips_relax_frag(segment, fragp, stretch)
  51 extern int mips_relax_frag (asection *, struct frag *, long);
  52
  53 #define md_undefined_symbol(name)       (0)
  54 #define md_operand(x)
  55
  56 extern void mips_handle_align (struct frag *);
  57 #define HANDLE_ALIGN(fragp)  mips_handle_align (fragp)
  58
  59 #define MAX_MEM_FOR_RS_ALIGN_CODE  (1 + 2)
  60
  61 /* We permit PC relative difference expressions when generating
  62    embedded PIC code.  */
  63 #define DIFF_EXPR_OK
  64
  65 /* Tell assembler that we have an itbl_mips.h header file to include.  */
  66 #define HAVE_ITBL_CPU
  67
  68 /* The endianness of the target format may change based on command
  69    line arguments.  */
  70 #define TARGET_FORMAT mips_target_format()
  71 extern const char *mips_target_format (void);
  72
  73 /* MIPS PIC level.  */
  74
  75 enum mips_pic_level
  76 {
  77   /* Do not generate PIC code.  */
  78   NO_PIC,
  79
  80   /* Generate PIC code as in the SVR4 MIPS ABI.  */
  81   SVR4_PIC,
  82
  83   /* Generate PIC code without using a global offset table: the data
  84      segment has a maximum size of 64K, all data references are off
  85      the $gp register, and all text references are PC relative.  This
  86      is used on some embedded systems.  */
  87   EMBEDDED_PIC
  88 };
  89
  90 extern enum mips_pic_level mips_pic;
  91
  92 struct mips_cl_insn
  93 {
  94   unsigned long insn_opcode;
  95   const struct mips_opcode *insn_mo;
  96   /* The next two fields are used when generating mips16 code.  */
  97   bfd_boolean use_extend;
  98   unsigned short extend;
  99 };
 100
 101 extern int tc_get_register (int frame);
 102
 103 #define md_after_parse_args() mips_after_parse_args()
 104 extern void mips_after_parse_args (void);
 105
 106 #define tc_init_after_args() mips_init_after_args()
 107 extern void mips_init_after_args (void);
 108
 109 #define md_parse_long_option(arg) mips_parse_long_option (arg)
 110 extern int mips_parse_long_option (const char *);
 111
 112 #define tc_frob_label(sym) mips_define_label (sym)
 113 extern void mips_define_label (symbolS *);
 114
 115 #define tc_frob_file_before_adjust() mips_frob_file_before_adjust ()
 116 extern void mips_frob_file_before_adjust (void);
 117
 118 #define tc_frob_file_before_fix() mips_frob_file ()
 119 extern void mips_frob_file (void);
 120
 121 #if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF)
 122 #define tc_frob_file_after_relocs mips_frob_file_after_relocs
 123 extern void mips_frob_file_after_relocs (void);
 124 #endif
 125
 126 #define tc_fix_adjustable(fixp) mips_fix_adjustable (fixp)
 127 extern int mips_fix_adjustable (struct fix *);
 128
 129 /* Values passed to md_apply_fix3 don't include symbol values.  */
 130 #define MD_APPLY_SYM_VALUE(FIX) 0
 131
 132 /* Global syms must not be resolved, to support ELF shared libraries.
 133    When generating embedded code, we don't have shared libs.  */
 134 #define EXTERN_FORCE_RELOC                      \
 135   (OUTPUT_FLAVOR == bfd_target_elf_flavour      \
 136    && mips_pic != EMBEDDED_PIC)
 137
 138 /* When generating embedded PIC code we must keep PC relative
 139    relocations.  */
 140 #define TC_FORCE_RELOCATION(FIX) mips_force_relocation (FIX)
 141 extern int mips_force_relocation (struct fix *);
 142
 143 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \
 144   (! SEG_NORMAL (SEG) || mips_force_relocation (FIX))
 145
 146 /* We use this to turn branches to global symbols into branches to
 147    local symbols, so that they can be simplified.  */
 148 #define TC_VALIDATE_FIX(fixp, this_segment, skip_label) \
 149   do \
 150     if (! mips_validate_fix ((fixp), (this_segment))) \
 151       goto skip_label; \
 152   while (0)
 153 extern int mips_validate_fix (struct fix *, asection *);
 154
 155 /* Register mask variables.  These are set by the MIPS assembly code
 156    and used by ECOFF and possibly other object file formats.  */
 157 extern unsigned long mips_gprmask;
 158 extern unsigned long mips_cprmask[4];
 159
 160 #if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF)
 161
 162 #define elf_tc_final_processing mips_elf_final_processing
 163 extern void mips_elf_final_processing (void);
 164
 165 #define ELF_TC_SPECIAL_SECTIONS \
 166   { ".sdata",   SHT_PROGBITS,   SHF_ALLOC + SHF_WRITE + SHF_MIPS_GPREL  }, \
 167   { ".sbss",    SHT_NOBITS,     SHF_ALLOC + SHF_WRITE + SHF_MIPS_GPREL  }, \
 168   { ".lit4",    SHT_PROGBITS,   SHF_ALLOC + SHF_WRITE + SHF_MIPS_GPREL  }, \
 169   { ".lit8",    SHT_PROGBITS,   SHF_ALLOC + SHF_WRITE + SHF_MIPS_GPREL  }, \
 170   { ".ucode",   SHT_MIPS_UCODE, 0                                       }, \
 171   { ".mdebug",  SHT_MIPS_DEBUG, 0                                       },
 172 /* Other special sections not generated by the assembler: .reginfo,
 173    .liblist, .conflict, .gptab, .got, .dynamic, .rel.dyn.  */
 174
 175 #endif
 176
 177 extern void md_mips_end (void);
 178 #define md_end()        md_mips_end()
 179
 180 #define USE_GLOBAL_POINTER_OPT  (OUTPUT_FLAVOR == bfd_target_ecoff_flavour \
 181                                  || OUTPUT_FLAVOR == bfd_target_coff_flavour \
 182                                  || OUTPUT_FLAVOR == bfd_target_elf_flavour)
 183
 184 extern void mips_pop_insert (void);
 185 #define md_pop_insert()         mips_pop_insert()
 186
 187 extern void mips_flush_pending_output (void);
 188 #define md_flush_pending_output mips_flush_pending_output
 189
 190 extern void mips_enable_auto_align (void);
 191 #define md_elf_section_change_hook()    mips_enable_auto_align()
 192
 193 extern enum dwarf2_format mips_dwarf2_format (void);
 194 #define DWARF2_FORMAT() mips_dwarf2_format ()
 195
 196 #define DWARF2_ADDR_SIZE(bfd) \
 197   (DWARF2_FORMAT () == dwarf2_format_32bit ? 4 : 8)
 198
 199 typedef struct {
 200   offsetT tc_fr_offset;
 201 } tc_frag_data_type;
 202 #define TC_FRAG_TYPE tc_frag_data_type
 203
 204 #endif /* TC_MIPS */