| 1 | /* tc-xc16x.c -- Assembler for the Infineon XC16X. |
| 2 | Copyright (C) 2006-2020 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 ("%s", 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 | /* ??? Adjust size? */ |
| 158 | fixP->fx_where += 1; |
| 159 | fixP->fx_pcrel = 1; |
| 160 | return BFD_RELOC_8_PCREL; |
| 161 | |
| 162 | case XC16X_OPERAND_CADDR: |
| 163 | fixP->fx_size = 2; |
| 164 | fixP->fx_where += 2; |
| 165 | return BFD_RELOC_16; |
| 166 | |
| 167 | case XC16X_OPERAND_UIMM7: |
| 168 | /* ??? Adjust size? */ |
| 169 | fixP->fx_where += 1; |
| 170 | fixP->fx_pcrel = 1; |
| 171 | return BFD_RELOC_8_PCREL; |
| 172 | |
| 173 | case XC16X_OPERAND_UIMM16: |
| 174 | case XC16X_OPERAND_MEMORY: |
| 175 | fixP->fx_size = 2; |
| 176 | fixP->fx_where += 2; |
| 177 | return BFD_RELOC_16; |
| 178 | |
| 179 | case XC16X_OPERAND_UPOF16: |
| 180 | fixP->fx_size = 2; |
| 181 | fixP->fx_where += 2; |
| 182 | return BFD_RELOC_XC16X_POF; |
| 183 | |
| 184 | case XC16X_OPERAND_UPAG16: |
| 185 | fixP->fx_size = 2; |
| 186 | fixP->fx_where += 2; |
| 187 | return BFD_RELOC_XC16X_PAG; |
| 188 | |
| 189 | case XC16X_OPERAND_USEG8: |
| 190 | /* ??? This is an 8 bit field, why the 16 bit reloc? */ |
| 191 | fixP->fx_where += 1; |
| 192 | return BFD_RELOC_XC16X_SEG; |
| 193 | |
| 194 | case XC16X_OPERAND_USEG16: |
| 195 | case XC16X_OPERAND_USOF16: |
| 196 | fixP->fx_size = 2; |
| 197 | fixP->fx_where += 2; |
| 198 | return BFD_RELOC_XC16X_SOF; |
| 199 | |
| 200 | default : /* Avoid -Wall warning. */ |
| 201 | break; |
| 202 | } |
| 203 | |
| 204 | return BFD_RELOC_NONE; |
| 205 | } |
| 206 | |
| 207 | /* Write a value out to the object file, using the appropriate endianness. */ |
| 208 | |
| 209 | void |
| 210 | md_number_to_chars (char * buf, valueT val, int n) |
| 211 | { |
| 212 | number_to_chars_littleendian (buf, val, n); |
| 213 | } |
| 214 | |
| 215 | void |
| 216 | md_show_usage (FILE * stream) |
| 217 | { |
| 218 | fprintf (stream, _(" XC16X specific command line options:\n")); |
| 219 | } |
| 220 | |
| 221 | int |
| 222 | md_parse_option (int c ATTRIBUTE_UNUSED, |
| 223 | const char *arg ATTRIBUTE_UNUSED) |
| 224 | { |
| 225 | return 0; |
| 226 | } |
| 227 | |
| 228 | const char * |
| 229 | md_atof (int type, char *litP, int *sizeP) |
| 230 | { |
| 231 | return ieee_md_atof (type, litP, sizeP, FALSE); |
| 232 | } |
| 233 | |
| 234 | valueT |
| 235 | md_section_align (segT segment, valueT size) |
| 236 | { |
| 237 | int align = bfd_section_alignment (segment); |
| 238 | return ((size + (1 << align) - 1) & -(1 << align)); |
| 239 | } |
| 240 | |
| 241 | symbolS * |
| 242 | md_undefined_symbol (char *name ATTRIBUTE_UNUSED) |
| 243 | { |
| 244 | return NULL; |
| 245 | } |
| 246 | |
| 247 | int |
| 248 | md_estimate_size_before_relax (fragS *fragP ATTRIBUTE_UNUSED, |
| 249 | segT segment_type ATTRIBUTE_UNUSED) |
| 250 | { |
| 251 | printf (_("call to md_estimate_size_before_relax \n")); |
| 252 | abort (); |
| 253 | } |
| 254 | |
| 255 | |
| 256 | long |
| 257 | md_pcrel_from (fixS *fixP) |
| 258 | { |
| 259 | long temp_val; |
| 260 | temp_val=fixP->fx_size + fixP->fx_where + fixP->fx_frag->fr_address; |
| 261 | |
| 262 | return temp_val; |
| 263 | } |
| 264 | |
| 265 | long |
| 266 | md_pcrel_from_section (fixS *fixP, segT sec) |
| 267 | { |
| 268 | if (fixP->fx_addsy != (symbolS *) NULL |
| 269 | && (! S_IS_DEFINED (fixP->fx_addsy) |
| 270 | || S_GET_SEGMENT (fixP->fx_addsy) != sec |
| 271 | || S_IS_EXTERNAL (fixP->fx_addsy) |
| 272 | || S_IS_WEAK (fixP->fx_addsy))) |
| 273 | { |
| 274 | return 0; |
| 275 | } |
| 276 | |
| 277 | return md_pcrel_from (fixP); |
| 278 | } |
| 279 | |
| 280 | arelent * |
| 281 | tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp) |
| 282 | { |
| 283 | arelent *rel; |
| 284 | bfd_reloc_code_real_type r_type; |
| 285 | |
| 286 | if (fixp->fx_addsy && fixp->fx_subsy) |
| 287 | { |
| 288 | if ((S_GET_SEGMENT (fixp->fx_addsy) != S_GET_SEGMENT (fixp->fx_subsy)) |
| 289 | || S_GET_SEGMENT (fixp->fx_addsy) == undefined_section) |
| 290 | { |
| 291 | as_bad_where (fixp->fx_file, fixp->fx_line, |
| 292 | _("Difference of symbols in different sections is not supported")); |
| 293 | return NULL; |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | rel = XNEW (arelent); |
| 298 | rel->sym_ptr_ptr = XNEW (asymbol *); |
| 299 | *rel->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy); |
| 300 | rel->address = fixp->fx_frag->fr_address + fixp->fx_where; |
| 301 | rel->addend = fixp->fx_offset; |
| 302 | |
| 303 | r_type = fixp->fx_r_type; |
| 304 | |
| 305 | #define DEBUG 0 |
| 306 | #if DEBUG |
| 307 | fprintf (stderr, "%s\n", bfd_get_reloc_code_name (r_type)); |
| 308 | fflush (stderr); |
| 309 | #endif |
| 310 | |
| 311 | rel->howto = bfd_reloc_type_lookup (stdoutput, r_type); |
| 312 | if (rel->howto == NULL) |
| 313 | { |
| 314 | as_bad_where (fixp->fx_file, fixp->fx_line, |
| 315 | _("Cannot represent relocation type %s"), |
| 316 | bfd_get_reloc_code_name (r_type)); |
| 317 | return NULL; |
| 318 | } |
| 319 | |
| 320 | return rel; |
| 321 | } |
| 322 | |
| 323 | void |
| 324 | md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED) |
| 325 | { |
| 326 | if (!strstr (seg->name,".debug")) |
| 327 | { |
| 328 | if (*valP < 128) |
| 329 | *valP /= 2; |
| 330 | if (*valP>268435455) |
| 331 | { |
| 332 | *valP = *valP * (-1); |
| 333 | *valP /= 2; |
| 334 | *valP = 256 - (*valP); |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | gas_cgen_md_apply_fix (fixP, valP, seg); |
| 339 | return; |
| 340 | } |
| 341 | |
| 342 | void |
| 343 | md_convert_frag (bfd *headers ATTRIBUTE_UNUSED, |
| 344 | segT seg ATTRIBUTE_UNUSED, |
| 345 | fragS *fragP ATTRIBUTE_UNUSED) |
| 346 | { |
| 347 | printf (_("call to md_convert_frag \n")); |
| 348 | abort (); |
| 349 | } |