gas/config/tc-xc16x.c

   1 /* tc-xc16x.c -- Assembler for the Infineon XC16X.
   2    Copyright 2006, 2007 Free Software Foundation, Inc.
   3    Contributed by KPIT Cummins Infosystems
   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 3, 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, 51 Franklin Street - Fifth Floor, Boston, MA
  20    02110-1301, USA.  */
  21
  22
  23 #include "as.h"
  24 #include "safe-ctype.h"
  25 #include "subsegs.h"
  26 #include "symcat.h"
  27 #include "opcodes/xc16x-desc.h"
  28 #include "opcodes/xc16x-opc.h"
  29 #include "cgen.h"
  30 #include "dwarf2dbg.h"
  31
  32
  33 #ifdef OBJ_ELF
  34 #include "elf/xc16x.h"
  35 #endif
  36
  37 /* Structure to hold all of the different components describing
  38    an individual instruction.  */
  39 typedef struct
  40 {
  41   const CGEN_INSN *     insn;
  42   const CGEN_INSN *     orig_insn;
  43   CGEN_FIELDS           fields;
  44 #if CGEN_INT_INSN_P
  45   CGEN_INSN_INT         buffer [1];
  46 #define INSN_VALUE(buf) (*(buf))
  47 #else
  48   unsigned char buffer [CGEN_MAX_INSN_SIZE];
  49 #define INSN_VALUE(buf) (buf)
  50 #endif
  51   char *                addr;
  52   fragS *               frag;
  53   int                   num_fixups;
  54   fixS *                fixups [GAS_CGEN_MAX_FIXUPS];
  55   int                   indices [MAX_OPERAND_INSTANCES];
  56 }
  57 xc16x_insn;
  58
  59 const char comment_chars[]        = ";";
  60 const char line_comment_chars[]   = "#";
  61 const char line_separator_chars[] = "";
  62 const char EXP_CHARS[]            = "eE";
  63 const char FLT_CHARS[]            = "dD";
  64
  65 #define XC16X_SHORTOPTS ""
  66 const char * md_shortopts = XC16X_SHORTOPTS;
  67
  68 struct option md_longopts[] =
  69 {
  70   {NULL, no_argument, NULL, 0}
  71 };
  72 size_t md_longopts_size = sizeof (md_longopts);
  73
  74 static void
  75 xc16xlmode (int arg ATTRIBUTE_UNUSED)
  76 {
  77  if (stdoutput != NULL)
  78   if (!bfd_set_arch_mach (stdoutput, bfd_arch_xc16x, bfd_mach_xc16xl))
  79     as_warn (_("could not set architecture and machine"));
  80 }
  81
  82 static void
  83 xc16xsmode (int arg ATTRIBUTE_UNUSED)
  84 {
  85   if (!bfd_set_arch_mach (stdoutput, bfd_arch_xc16x, bfd_mach_xc16xs))
  86     as_warn (_("could not set architecture and machine"));
  87 }
  88
  89 static void
  90 xc16xmode (int arg ATTRIBUTE_UNUSED)
  91 {
  92   if (!bfd_set_arch_mach (stdoutput, bfd_arch_xc16x, bfd_mach_xc16x))
  93     as_warn (_("could not set architecture and machine"));
  94 }
  95
  96 /* The target specific pseudo-ops which we support.  */
  97 const pseudo_typeS md_pseudo_table[] =
  98 {
  99   { "word",     cons,           2 },
 100   {"xc16xl",  xc16xlmode,  0},
 101   {"xc16xs", xc16xsmode, 0},
 102   {"xc16x",  xc16xmode,  0},
 103   { NULL,       NULL,           0 }
 104 };
 105
 106 void
 107 md_begin (void)
 108 {
 109   /* Initialize the `cgen' interface.  */
 110
 111   /* Set the machine number and endian.  */
 112   gas_cgen_cpu_desc = xc16x_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,
 113                                            CGEN_CPU_OPEN_ENDIAN,
 114                                            CGEN_ENDIAN_LITTLE,
 115                                            CGEN_CPU_OPEN_END);
 116   xc16x_cgen_init_asm (gas_cgen_cpu_desc);
 117
 118   /* This is a callback from cgen to gas to parse operands.  */
 119   cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
 120 }
 121
 122 void
 123 md_assemble (char *str)
 124 {
 125   xc16x_insn insn;
 126   char *errmsg;
 127
 128   /* Initialize GAS's cgen interface for a new instruction.  */
 129   gas_cgen_init_parse ();
 130
 131   insn.insn = xc16x_cgen_assemble_insn
 132     (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
 133
 134   if (!insn.insn)
 135     {
 136       as_bad (errmsg);
 137       return;
 138     }
 139
 140   /* Doesn't really matter what we pass for RELAX_P here.  */
 141   gas_cgen_finish_insn (insn.insn, insn.buffer,
 142                         CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
 143 }
 144
 145 /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
 146    Returns BFD_RELOC_NONE if no reloc type can be found.
 147    *FIXP may be modified if desired.  */
 148
 149 bfd_reloc_code_real_type
 150 md_cgen_lookup_reloc (const CGEN_INSN *insn ATTRIBUTE_UNUSED,
 151                       const CGEN_OPERAND *operand,
 152                       fixS *fixP)
 153 {
 154   switch (operand->type)
 155     {
 156     case XC16X_OPERAND_REL:
 157       fixP->fx_where += 1;
 158       fixP->fx_pcrel = 1;
 159       return BFD_RELOC_8_PCREL;
 160
 161     case XC16X_OPERAND_CADDR:
 162       fixP->fx_where += 2;
 163       return BFD_RELOC_16;
 164
 165     case XC16X_OPERAND_UIMM7:
 166       fixP->fx_where += 1;
 167       fixP->fx_pcrel = 1;
 168       return BFD_RELOC_8_PCREL;
 169
 170     case XC16X_OPERAND_UIMM16:
 171     case XC16X_OPERAND_MEMORY:
 172       fixP->fx_where += 2;
 173       return BFD_RELOC_16;
 174
 175     case XC16X_OPERAND_UPOF16:
 176       fixP->fx_where += 2;
 177       return BFD_RELOC_XC16X_POF;
 178
 179     case XC16X_OPERAND_UPAG16:
 180       fixP->fx_where += 2;
 181       return BFD_RELOC_XC16X_PAG;
 182
 183     case XC16X_OPERAND_USEG8:
 184       fixP->fx_where += 1;
 185       return BFD_RELOC_XC16X_SEG;
 186
 187     case XC16X_OPERAND_USEG16:
 188     case  XC16X_OPERAND_USOF16:
 189       fixP->fx_where += 2;
 190       return BFD_RELOC_XC16X_SOF;
 191
 192     default : /* Avoid -Wall warning.  */
 193       break;
 194     }
 195
 196   fixP->fx_where += 2;
 197   return BFD_RELOC_XC16X_SOF;
 198 }
 199
 200 /* Write a value out to the object file, using the appropriate endianness.  */
 201
 202 void
 203 md_number_to_chars (char * buf, valueT val, int n)
 204 {
 205   number_to_chars_littleendian (buf, val, n);
 206 }
 207
 208 void
 209 md_show_usage (FILE * stream)
 210 {
 211   fprintf (stream, _(" XC16X specific command line options:\n"));
 212 }
 213
 214 int
 215 md_parse_option (int c ATTRIBUTE_UNUSED,
 216                  char *arg ATTRIBUTE_UNUSED)
 217 {
 218   return 0;
 219 }
 220
 221 char *
 222 md_atof (int type, char *litP, int *sizeP)
 223 {
 224   return ieee_md_atof (type, litP, sizeP, FALSE);
 225 }
 226
 227 valueT
 228 md_section_align (segT segment, valueT size)
 229 {
 230   int align = bfd_get_section_alignment (stdoutput, segment);
 231   return ((size + (1 << align) - 1) & (-1 << align));
 232 }
 233
 234 symbolS *
 235 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
 236 {
 237   return NULL;
 238 }
 239
 240 int
 241 md_estimate_size_before_relax (fragS *fragP ATTRIBUTE_UNUSED,
 242                                segT segment_type ATTRIBUTE_UNUSED)
 243 {
 244   printf (_("call to md_estimate_size_before_relax \n"));
 245   abort ();
 246 }
 247
 248
 249 long
 250 md_pcrel_from (fixS *fixP)
 251 {
 252   long temp_val;
 253   temp_val=fixP->fx_size + fixP->fx_where + fixP->fx_frag->fr_address;
 254
 255   return temp_val;
 256 }
 257
 258 long
 259 md_pcrel_from_section (fixS *fixP, segT sec)
 260 {
 261   if (fixP->fx_addsy != (symbolS *) NULL
 262       && (! S_IS_DEFINED (fixP->fx_addsy)
 263           || S_GET_SEGMENT (fixP->fx_addsy) != sec
 264           || S_IS_EXTERNAL (fixP->fx_addsy)
 265           || S_IS_WEAK (fixP->fx_addsy)))
 266     {
 267       return 0;
 268     }
 269
 270   return md_pcrel_from (fixP);
 271 }
 272
 273 arelent *
 274 tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp)
 275 {
 276   arelent *rel;
 277   bfd_reloc_code_real_type r_type;
 278
 279   if (fixp->fx_addsy && fixp->fx_subsy)
 280     {
 281       if ((S_GET_SEGMENT (fixp->fx_addsy) != S_GET_SEGMENT (fixp->fx_subsy))
 282           || S_GET_SEGMENT (fixp->fx_addsy) == undefined_section)
 283         {
 284           as_bad_where (fixp->fx_file, fixp->fx_line,
 285                         _("Difference of symbols in different sections is not supported"));
 286           return NULL;
 287         }
 288     }
 289
 290   rel = xmalloc (sizeof (arelent));
 291   rel->sym_ptr_ptr = xmalloc (sizeof (asymbol *));
 292   *rel->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
 293   rel->address = fixp->fx_frag->fr_address + fixp->fx_where;
 294   rel->addend = fixp->fx_offset;
 295
 296   r_type = fixp->fx_r_type;
 297
 298 #define DEBUG 0
 299 #if DEBUG
 300   fprintf (stderr, "%s\n", bfd_get_reloc_code_name (r_type));
 301   fflush (stderr);
 302 #endif
 303
 304   rel->howto = bfd_reloc_type_lookup (stdoutput, r_type);
 305    if (rel->howto == NULL)
 306     {
 307       as_bad_where (fixp->fx_file, fixp->fx_line,
 308                     _("Cannot represent relocation type %s"),
 309                     bfd_get_reloc_code_name (r_type));
 310       return NULL;
 311     }
 312
 313   return rel;
 314 }
 315
 316 void
 317 md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED)
 318 {
 319   if (!strstr (seg->name,".debug"))
 320     {
 321       if (*valP < 128)
 322         *valP /= 2;
 323       if (*valP>268435455)
 324         {
 325           *valP = *valP * (-1);
 326           *valP /= 2;
 327           *valP = 256 - (*valP);
 328         }
 329     }
 330
 331   gas_cgen_md_apply_fix (fixP, valP, seg);
 332   return;
 333 }
 334
 335 void
 336 md_convert_frag (bfd *headers ATTRIBUTE_UNUSED,
 337                  segT seg ATTRIBUTE_UNUSED,
 338                  fragS *fragP ATTRIBUTE_UNUSED)
 339 {
 340   printf (_("call to md_convert_frag \n"));
 341   abort ();
 342 }