gas/config/tc-frv.h

   1 /* tc-frv.h -- Header file for tc-frv.c.
   2    Copyright 2002, 2004, 2005 Free Software Foundation, Inc.
   3
   4    This file is part of GAS, the GNU Assembler.
   5
   6    GAS 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 2, or (at your option)
   9    any later version.
  10
  11    GAS 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 GAS; see the file COPYING.  If not, write to
  18    the Free Software Foundation, 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA. */
  20
  21 #define TC_FRV
  22
  23 #ifndef BFD_ASSEMBLER
  24 /* leading space so will compile with cc */
  25  #error FRV support requires BFD_ASSEMBLER
  26 #endif
  27
  28 #define LISTING_HEADER "FRV GAS "
  29
  30 /* The target BFD architecture.  */
  31 #define TARGET_ARCH bfd_arch_frv
  32
  33 #define TARGET_FORMAT (frv_md_fdpic_enabled () \
  34                        ? "elf32-frvfdpic" : "elf32-frv")
  35 extern bfd_boolean frv_md_fdpic_enabled (void);
  36
  37 #define TARGET_BYTES_BIG_ENDIAN 1
  38
  39 /* Permit temporary numeric labels.  */
  40 #define LOCAL_LABELS_FB 1
  41
  42 #define DIFF_EXPR_OK            /* .-foo gets turned into PC relative relocs */
  43
  44 /* We don't need to handle .word strangely.  */
  45 #define WORKING_DOT_WORD
  46
  47 /* Values passed to md_apply_fix3 don't include the symbol value.  */
  48 #define MD_APPLY_SYM_VALUE(FIX) 0
  49
  50 extern void frv_tomcat_workaround PARAMS ((void));
  51 #define md_cleanup frv_tomcat_workaround
  52
  53 #define md_number_to_chars frv_md_number_to_chars
  54
  55 extern long frv_relax_frag PARAMS ((fragS *, long));
  56 #define md_relax_frag(segment, fragP, stretch) frv_relax_frag(fragP, stretch)
  57
  58 #define tc_fix_adjustable(FIX) frv_fix_adjustable (FIX)
  59 struct fix;
  60 extern bfd_boolean frv_fix_adjustable PARAMS ((struct fix *));
  61
  62 /* When relaxing, we need to emit various relocs we otherwise wouldn't.  */
  63 #define TC_FORCE_RELOCATION(fix) frv_force_relocation (fix)
  64 extern int frv_force_relocation PARAMS ((struct fix *));
  65
  66 /* If we simplify subtractions that aren't SUB_SAME or SUB_ABS, we end
  67    up with PCrel fixups, but since we don't have any PCrel relocs, we
  68    crash.  Preventing simplification gets us a good, early error.  */
  69 #define TC_FORCE_RELOCATION_SUB_LOCAL(fixP) 1
  70
  71 #undef GAS_CGEN_MAX_FIXUPS
  72 #define GAS_CGEN_MAX_FIXUPS 1
  73
  74 void frv_frob_label PARAMS ((symbolS *));
  75 #define tc_frob_label(sym) frv_frob_label(sym)
  76
  77 #define tc_gen_reloc gas_cgen_tc_gen_reloc
  78
  79 #define md_cgen_record_fixup_exp frv_cgen_record_fixup_exp
  80
  81 /* Call md_pcrel_from_section(), not md_pcrel_from().  */
  82 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
  83 extern long md_pcrel_from_section PARAMS ((struct fix *, segT));
  84
  85 /* After all of the symbols have been adjusted, go over the file looking
  86    for any relocations that pic won't support.  */
  87 #define tc_frob_file() frv_frob_file ()
  88 extern void frv_frob_file       PARAMS ((void));
  89
  90 /* We don't want 0x00 for code alignment because this generates `add.p
  91    gr0, gr0, gr0' patterns.  Although it's fine as a nop instruction,
  92    it has the VLIW packing bit set, which means if you have a bunch of
  93    them in a row and attempt to execute them, you'll exceed the VLIW
  94    capacity and fail.  This also gets GDB confused sometimes, because
  95    it won't set breakpoints in instructions other than the first of a
  96    VLIW pack, so you used to be unable to set a breakpoint in the
  97    initial instruction of a function that followed such
  98    alignment-introduced instructions.
  99
 100    We could have arranged to emit `nop' instructions (0x80880000),
 101    maybe even VLIW-pack sequences of nop instructions as much as
 102    possible for the selected machine type, just in case the alignment
 103    code actually happens to run, but this is probably too much effort
 104    for little gain.  This code is not meant to be run anyway, so just
 105    emit nops.  */
 106 #define MAX_MEM_FOR_RS_ALIGN_CODE (3 + 4)
 107 #define HANDLE_ALIGN(FRAGP) do                                          \
 108   if ((FRAGP)->fr_type == rs_align_code)                                \
 109     {                                                                   \
 110       valueT count = ((FRAGP)->fr_next->fr_address                      \
 111                       - ((FRAGP)->fr_address + (FRAGP)->fr_fix));       \
 112       char *dest = (FRAGP)->fr_literal + (FRAGP)->fr_fix;               \
 113       if ((count & 3) != 0)                                             \
 114         {                                                               \
 115           memset (dest, 0, (count & 3));                                \
 116           (FRAGP)->fr_fix += (count & 3);                               \
 117           dest += (count & 3);                                          \
 118           count -= (count & 3);                                         \
 119         }                                                               \
 120       if (count)                                                        \
 121         {                                                               \
 122           (FRAGP)->fr_var = 4;                                          \
 123           *dest++ = 0x80;                                               \
 124           *dest++ = 0x88;                                               \
 125           *dest++ = 0x00;                                               \
 126           *dest++ = 0x00;                                               \
 127         }                                                               \
 128     }                                                                   \
 129  while (0)