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 /* Turn a string in input_line_pointer into a floating point constant
 222    of type TYPE, and store the appropriate bytes in *LITP.  The number
 223    of LITTLENUMS emitted is stored in *SIZEP.  An error message is
 224    returned, or NULL on OK.  */
 225
 226 /* Equal to MAX_PRECISION in atof-ieee.c.  */
 227 #define MAX_LITTLENUMS 6
 228
 229 char *
 230 md_atof (int type, char *litP, int *sizeP)
 231 {
 232   int i;
 233   int prec;
 234   LITTLENUM_TYPE words[MAX_LITTLENUMS];
 235   char *t;
 236
 237   switch (type)
 238     {
 239     case 'f':
 240     case 'F':
 241     case 's':
 242     case 'S':
 243       prec = 2;
 244       break;
 245
 246     case 'd':
 247     case 'D':
 248     case 'r':
 249     case 'R':
 250       prec = 4;
 251       break;
 252
 253       /* FIXME: Some targets allow other format chars for bigger sizes
 254          here.  */
 255
 256     default:
 257       *sizeP = 0;
 258       return _("Bad call to md_atof()");
 259     }
 260
 261   t = atof_ieee (input_line_pointer, type, words);
 262   if (t)
 263     input_line_pointer = t;
 264   *sizeP = prec * sizeof (LITTLENUM_TYPE);
 265
 266    for (i = prec - 1; i >= 0; i--)
 267      {
 268        md_number_to_chars (litP, (valueT) words[i],
 269                            sizeof (LITTLENUM_TYPE));
 270        litP += sizeof (LITTLENUM_TYPE);
 271      }
 272
 273   return NULL;
 274 }
 275
 276 valueT
 277 md_section_align (segT segment, valueT size)
 278 {
 279   int align = bfd_get_section_alignment (stdoutput, segment);
 280   return ((size + (1 << align) - 1) & (-1 << align));
 281 }
 282
 283 symbolS *
 284 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
 285 {
 286   return NULL;
 287 }
 288
 289 int
 290 md_estimate_size_before_relax (fragS *fragP ATTRIBUTE_UNUSED,
 291                                segT segment_type ATTRIBUTE_UNUSED)
 292 {
 293   printf (_("call tomd_estimate_size_before_relax \n"));
 294   abort ();
 295 }
 296
 297
 298 long
 299 md_pcrel_from (fixS *fixP)
 300 {
 301   long temp_val;
 302   temp_val=fixP->fx_size + fixP->fx_where + fixP->fx_frag->fr_address;
 303
 304   return temp_val;
 305 }
 306
 307 long
 308 md_pcrel_from_section (fixS *fixP, segT sec)
 309 {
 310   if (fixP->fx_addsy != (symbolS *) NULL
 311       && (! S_IS_DEFINED (fixP->fx_addsy)
 312           || S_GET_SEGMENT (fixP->fx_addsy) != sec
 313           || S_IS_EXTERNAL (fixP->fx_addsy)
 314           || S_IS_WEAK (fixP->fx_addsy)))
 315     {
 316       return 0;
 317     }
 318
 319   return md_pcrel_from (fixP);
 320 }
 321
 322 arelent *
 323 tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp)
 324 {
 325   arelent *rel;
 326   bfd_reloc_code_real_type r_type;
 327
 328   if (fixp->fx_addsy && fixp->fx_subsy)
 329     {
 330       if ((S_GET_SEGMENT (fixp->fx_addsy) != S_GET_SEGMENT (fixp->fx_subsy))
 331           || S_GET_SEGMENT (fixp->fx_addsy) == undefined_section)
 332         {
 333           as_bad_where (fixp->fx_file, fixp->fx_line,
 334                         "Difference of symbols in different sections is not supported");
 335           return NULL;
 336         }
 337     }
 338
 339   rel = xmalloc (sizeof (arelent));
 340   rel->sym_ptr_ptr = xmalloc (sizeof (asymbol *));
 341   *rel->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
 342   rel->address = fixp->fx_frag->fr_address + fixp->fx_where;
 343   rel->addend = fixp->fx_offset;
 344
 345   r_type = fixp->fx_r_type;
 346
 347 #define DEBUG 0
 348 #if DEBUG
 349   fprintf (stderr, "%s\n", bfd_get_reloc_code_name (r_type));
 350   fflush(stderr);
 351 #endif
 352
 353   rel->howto = bfd_reloc_type_lookup (stdoutput, r_type);
 354    if (rel->howto == NULL)
 355     {
 356       as_bad_where (fixp->fx_file, fixp->fx_line,
 357                     _("Cannot represent relocation type %s"),
 358                     bfd_get_reloc_code_name (r_type));
 359       return NULL;
 360     }
 361
 362   return rel;
 363 }
 364
 365 void
 366 md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED)
 367 {
 368   if(!strstr (seg->name,".debug"))
 369     {
 370       if (*valP < 128)
 371         *valP /= 2;
 372       if (*valP>268435455)
 373         {
 374           *valP = *valP * (-1);
 375           *valP /= 2;
 376           *valP = 256 - (*valP);
 377         }
 378     }
 379
 380   gas_cgen_md_apply_fix (fixP, valP, seg);
 381   return;
 382 }
 383
 384 void
 385 md_convert_frag (bfd *headers ATTRIBUTE_UNUSED,
 386                  segT seg ATTRIBUTE_UNUSED,
 387                  fragS *fragP ATTRIBUTE_UNUSED)
 388 {
 389   printf (_("call to md_convert_frag \n"));
 390   abort ();
 391 }
 392
 393