1 /* tc-mep.c -- Assembler for the Toshiba Media Processor.
2 Copyright (C) 2001-2016 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
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 3, or (at your option)
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.
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, 51 Franklin Street, Fifth Floor,
19 Boston, MA 02110-1301, USA. */
23 #include "dwarf2dbg.h"
26 #include "opcodes/mep-desc.h"
27 #include "opcodes/mep-opc.h"
29 #include "elf/common.h"
33 /* Structure to hold all of the different components describing
34 an individual instruction. */
37 const CGEN_INSN * insn;
38 const CGEN_INSN * orig_insn;
41 CGEN_INSN_INT buffer [1];
42 #define INSN_VALUE(buf) (*(buf))
44 unsigned char buffer [CGEN_MAX_INSN_SIZE];
45 #define INSN_VALUE(buf) (buf)
50 fixS * fixups [GAS_CGEN_MAX_FIXUPS];
51 int indices [MAX_OPERAND_INSTANCES];
54 static int mode = CORE; /* Start in core mode. */
55 static int pluspresent = 0;
56 static int allow_disabled_registers = 0;
57 static int library_flag = 0;
58 static int mep_cop = EF_MEP_COP_NONE;
60 /* We're going to need to store all of the instructions along with
61 their fixups so that we can parallelization grouping rules. */
63 static mep_insn saved_insns[MAX_SAVED_FIXUP_CHAINS];
64 static int num_insns_saved = 0;
66 const char comment_chars[] = "#";
67 const char line_comment_chars[] = ";#";
68 const char line_separator_chars[] = ";";
69 const char EXP_CHARS[] = "eE";
70 const char FLT_CHARS[] = "dD";
72 static void mep_switch_to_vliw_mode (int);
73 static void mep_switch_to_core_mode (int);
74 static void mep_s_vtext (int);
75 static void mep_noregerr (int);
77 /* The target specific pseudo-ops which we support. */
78 const pseudo_typeS md_pseudo_table[] =
81 { "vliw", mep_switch_to_vliw_mode, 0 },
82 { "core", mep_switch_to_core_mode, 0 },
83 { "vtext", mep_s_vtext, 0 },
84 { "noregerr", mep_noregerr, 0 },
88 /* Relocations against symbols are done in two
89 parts, with a HI relocation and a LO relocation. Each relocation
90 has only 16 bits of space to store an addend. This means that in
91 order for the linker to handle carries correctly, it must be able
92 to locate both the HI and the LO relocation. This means that the
93 relocations must appear in order in the relocation table.
95 In order to implement this, we keep track of each unmatched HI
96 relocation. We then sort them so that they immediately precede the
97 corresponding LO relocation. */
101 struct mep_hi_fixup * next; /* Next HI fixup. */
102 fixS * fixp; /* This fixup. */
103 segT seg; /* The section this fixup is in. */
106 /* The list of unmatched HI relocs. */
107 static struct mep_hi_fixup * mep_hi_fixup_list;
110 #define OPTION_EB (OPTION_MD_BASE + 0)
111 #define OPTION_EL (OPTION_MD_BASE + 1)
112 #define OPTION_CONFIG (OPTION_MD_BASE + 2)
113 #define OPTION_AVERAGE (OPTION_MD_BASE + 3)
114 #define OPTION_NOAVERAGE (OPTION_MD_BASE + 4)
115 #define OPTION_MULT (OPTION_MD_BASE + 5)
116 #define OPTION_NOMULT (OPTION_MD_BASE + 6)
117 #define OPTION_DIV (OPTION_MD_BASE + 7)
118 #define OPTION_NODIV (OPTION_MD_BASE + 8)
119 #define OPTION_BITOPS (OPTION_MD_BASE + 9)
120 #define OPTION_NOBITOPS (OPTION_MD_BASE + 10)
121 #define OPTION_LEADZ (OPTION_MD_BASE + 11)
122 #define OPTION_NOLEADZ (OPTION_MD_BASE + 12)
123 #define OPTION_ABSDIFF (OPTION_MD_BASE + 13)
124 #define OPTION_NOABSDIFF (OPTION_MD_BASE + 14)
125 #define OPTION_MINMAX (OPTION_MD_BASE + 15)
126 #define OPTION_NOMINMAX (OPTION_MD_BASE + 16)
127 #define OPTION_CLIP (OPTION_MD_BASE + 17)
128 #define OPTION_NOCLIP (OPTION_MD_BASE + 18)
129 #define OPTION_SATUR (OPTION_MD_BASE + 19)
130 #define OPTION_NOSATUR (OPTION_MD_BASE + 20)
131 #define OPTION_COP32 (OPTION_MD_BASE + 21)
132 #define OPTION_REPEAT (OPTION_MD_BASE + 25)
133 #define OPTION_NOREPEAT (OPTION_MD_BASE + 26)
134 #define OPTION_DEBUG (OPTION_MD_BASE + 27)
135 #define OPTION_NODEBUG (OPTION_MD_BASE + 28)
136 #define OPTION_UCI (OPTION_MD_BASE + 29)
137 #define OPTION_NOUCI (OPTION_MD_BASE + 30)
138 #define OPTION_DSP (OPTION_MD_BASE + 31)
139 #define OPTION_NODSP (OPTION_MD_BASE + 32)
140 #define OPTION_LIBRARY (OPTION_MD_BASE + 33)
142 struct option md_longopts[] = {
143 { "EB", no_argument, NULL, OPTION_EB},
144 { "EL", no_argument, NULL, OPTION_EL},
145 { "mconfig", required_argument, NULL, OPTION_CONFIG},
146 { "maverage", no_argument, NULL, OPTION_AVERAGE},
147 { "mno-average", no_argument, NULL, OPTION_NOAVERAGE},
148 { "mmult", no_argument, NULL, OPTION_MULT},
149 { "mno-mult", no_argument, NULL, OPTION_NOMULT},
150 { "mdiv", no_argument, NULL, OPTION_DIV},
151 { "mno-div", no_argument, NULL, OPTION_NODIV},
152 { "mbitops", no_argument, NULL, OPTION_BITOPS},
153 { "mno-bitops", no_argument, NULL, OPTION_NOBITOPS},
154 { "mleadz", no_argument, NULL, OPTION_LEADZ},
155 { "mno-leadz", no_argument, NULL, OPTION_NOLEADZ},
156 { "mabsdiff", no_argument, NULL, OPTION_ABSDIFF},
157 { "mno-absdiff", no_argument, NULL, OPTION_NOABSDIFF},
158 { "mminmax", no_argument, NULL, OPTION_MINMAX},
159 { "mno-minmax", no_argument, NULL, OPTION_NOMINMAX},
160 { "mclip", no_argument, NULL, OPTION_CLIP},
161 { "mno-clip", no_argument, NULL, OPTION_NOCLIP},
162 { "msatur", no_argument, NULL, OPTION_SATUR},
163 { "mno-satur", no_argument, NULL, OPTION_NOSATUR},
164 { "mcop32", no_argument, NULL, OPTION_COP32},
165 { "mdebug", no_argument, NULL, OPTION_DEBUG},
166 { "mno-debug", no_argument, NULL, OPTION_NODEBUG},
167 { "muci", no_argument, NULL, OPTION_UCI},
168 { "mno-uci", no_argument, NULL, OPTION_NOUCI},
169 { "mdsp", no_argument, NULL, OPTION_DSP},
170 { "mno-dsp", no_argument, NULL, OPTION_NODSP},
171 { "mlibrary", no_argument, NULL, OPTION_LIBRARY},
172 { NULL, 0, NULL, 0 } };
173 size_t md_longopts_size = sizeof (md_longopts);
175 /* Options which default to on/off together. See the comment where
176 this is used for details. Note that CP and CP64 are not in this
177 list because disabling those overrides the -mivc2 option. */
178 #define OPTION_MASK \
179 ( (1 << CGEN_INSN_OPTIONAL_BIT_INSN) \
180 | (1 << CGEN_INSN_OPTIONAL_MUL_INSN) \
181 | (1 << CGEN_INSN_OPTIONAL_DIV_INSN) \
182 | (1 << CGEN_INSN_OPTIONAL_DEBUG_INSN) \
183 | (1 << CGEN_INSN_OPTIONAL_LDZ_INSN) \
184 | (1 << CGEN_INSN_OPTIONAL_ABS_INSN) \
185 | (1 << CGEN_INSN_OPTIONAL_AVE_INSN) \
186 | (1 << CGEN_INSN_OPTIONAL_MINMAX_INSN) \
187 | (1 << CGEN_INSN_OPTIONAL_CLIP_INSN) \
188 | (1 << CGEN_INSN_OPTIONAL_SAT_INSN) \
189 | (1 << CGEN_INSN_OPTIONAL_UCI_INSN) \
190 | (1 << CGEN_INSN_OPTIONAL_DSP_INSN) )
192 const char * md_shortopts = "";
193 static int optbits = 0;
194 static int optbitset = 0;
197 md_parse_option (int c, const char *arg ATTRIBUTE_UNUSED)
203 target_big_endian = 1;
206 target_big_endian = 0;
210 for (i=1; mep_config_map[i].name; i++)
211 if (strcmp (mep_config_map[i].name, arg) == 0)
218 fprintf (stderr, "Error: unknown configuration %s\n", arg);
221 mep_config_index = idx;
222 target_big_endian = mep_config_map[idx].big_endian;
225 optbits |= 1 << CGEN_INSN_OPTIONAL_AVE_INSN;
226 optbitset |= 1 << CGEN_INSN_OPTIONAL_AVE_INSN;
228 case OPTION_NOAVERAGE:
229 optbits &= ~(1 << CGEN_INSN_OPTIONAL_AVE_INSN);
230 optbitset |= 1 << CGEN_INSN_OPTIONAL_AVE_INSN;
233 optbits |= 1 << CGEN_INSN_OPTIONAL_MUL_INSN;
234 optbitset |= 1 << CGEN_INSN_OPTIONAL_MUL_INSN;
237 optbits &= ~(1 << CGEN_INSN_OPTIONAL_MUL_INSN);
238 optbitset |= 1 << CGEN_INSN_OPTIONAL_MUL_INSN;
241 optbits |= 1 << CGEN_INSN_OPTIONAL_DIV_INSN;
242 optbitset |= 1 << CGEN_INSN_OPTIONAL_DIV_INSN;
245 optbits &= ~(1 << CGEN_INSN_OPTIONAL_DIV_INSN);
246 optbitset |= 1 << CGEN_INSN_OPTIONAL_DIV_INSN;
249 optbits |= 1 << CGEN_INSN_OPTIONAL_BIT_INSN;
250 optbitset |= 1 << CGEN_INSN_OPTIONAL_BIT_INSN;
252 case OPTION_NOBITOPS:
253 optbits &= ~(1 << CGEN_INSN_OPTIONAL_BIT_INSN);
254 optbitset |= 1 << CGEN_INSN_OPTIONAL_BIT_INSN;
257 optbits |= 1 << CGEN_INSN_OPTIONAL_LDZ_INSN;
258 optbitset |= 1 << CGEN_INSN_OPTIONAL_LDZ_INSN;
261 optbits &= ~(1 << CGEN_INSN_OPTIONAL_LDZ_INSN);
262 optbitset |= 1 << CGEN_INSN_OPTIONAL_LDZ_INSN;
265 optbits |= 1 << CGEN_INSN_OPTIONAL_ABS_INSN;
266 optbitset |= 1 << CGEN_INSN_OPTIONAL_ABS_INSN;
268 case OPTION_NOABSDIFF:
269 optbits &= ~(1 << CGEN_INSN_OPTIONAL_ABS_INSN);
270 optbitset |= 1 << CGEN_INSN_OPTIONAL_ABS_INSN;
273 optbits |= 1 << CGEN_INSN_OPTIONAL_MINMAX_INSN;
274 optbitset |= 1 << CGEN_INSN_OPTIONAL_MINMAX_INSN;
276 case OPTION_NOMINMAX:
277 optbits &= ~(1 << CGEN_INSN_OPTIONAL_MINMAX_INSN);
278 optbitset |= 1 << CGEN_INSN_OPTIONAL_MINMAX_INSN;
281 optbits |= 1 << CGEN_INSN_OPTIONAL_CLIP_INSN;
282 optbitset |= 1 << CGEN_INSN_OPTIONAL_CLIP_INSN;
285 optbits &= ~(1 << CGEN_INSN_OPTIONAL_CLIP_INSN);
286 optbitset |= 1 << CGEN_INSN_OPTIONAL_CLIP_INSN;
289 optbits |= 1 << CGEN_INSN_OPTIONAL_SAT_INSN;
290 optbitset |= 1 << CGEN_INSN_OPTIONAL_SAT_INSN;
293 optbits &= ~(1 << CGEN_INSN_OPTIONAL_SAT_INSN);
294 optbitset |= 1 << CGEN_INSN_OPTIONAL_SAT_INSN;
297 optbits |= 1 << CGEN_INSN_OPTIONAL_CP_INSN;
298 optbitset |= 1 << CGEN_INSN_OPTIONAL_CP_INSN;
301 optbits |= 1 << CGEN_INSN_OPTIONAL_DEBUG_INSN;
302 optbitset |= 1 << CGEN_INSN_OPTIONAL_DEBUG_INSN;
305 optbits &= ~(1 << CGEN_INSN_OPTIONAL_DEBUG_INSN);
306 optbitset |= 1 << CGEN_INSN_OPTIONAL_DEBUG_INSN;
309 optbits |= 1 << CGEN_INSN_OPTIONAL_UCI_INSN;
310 optbitset |= 1 << CGEN_INSN_OPTIONAL_UCI_INSN;
313 optbits &= ~(1 << CGEN_INSN_OPTIONAL_UCI_INSN);
314 optbitset |= 1 << CGEN_INSN_OPTIONAL_UCI_INSN;
317 optbits |= 1 << CGEN_INSN_OPTIONAL_DSP_INSN;
318 optbitset |= 1 << CGEN_INSN_OPTIONAL_DSP_INSN;
321 optbits &= ~(1 << CGEN_INSN_OPTIONAL_DSP_INSN);
322 optbitset |= 1 << CGEN_INSN_OPTIONAL_DSP_INSN;
325 library_flag = EF_MEP_LIBRARY;
328 case OPTION_NOREPEAT:
337 md_show_usage (FILE *stream)
339 fprintf (stream, _("MeP specific command line options:\n\
340 -EB assemble for a big endian system\n\
341 -EL assemble for a little endian system (default)\n\
342 -mconfig=<name> specify a chip configuration to use\n\
343 -maverage -mno-average -mmult -mno-mult -mdiv -mno-div\n\
344 -mbitops -mno-bitops -mleadz -mno-leadz -mabsdiff -mno-absdiff\n\
345 -mminmax -mno-minmax -mclip -mno-clip -msatur -mno-satur -mcop32\n\
346 enable/disable the given opcodes\n\
348 If -mconfig is given, the other -m options modify it. Otherwise,\n\
349 if no -m options are given, all core opcodes are enabled;\n\
350 if any enabling -m options are given, only those are enabled;\n\
351 if only disabling -m options are given, only those are disabled.\n\
353 if (mep_config_map[1].name)
356 fprintf (stream, " -mconfig=STR specify the configuration to use\n");
357 fprintf (stream, " Configurations:");
358 for (i=0; mep_config_map[i].name; i++)
359 fprintf (stream, " %s", mep_config_map[i].name);
360 fprintf (stream, "\n");
367 mep_check_for_disabled_registers (mep_insn *insn)
369 static int initted = 0;
370 static int has_mul_div = 0;
371 static int has_cop = 0;
372 static int has_debug = 0;
375 if (allow_disabled_registers)
379 if (target_big_endian)
380 b = insn->buffer[0] * 256 + insn->buffer[1];
382 b = insn->buffer[1] * 256 + insn->buffer[0];
387 if ((b & 0xfffff00e) == 0x7008 /* stc */
388 || (b & 0xfffff00e) == 0x700a /* ldc */)
393 if ((MEP_OMASK & (1 << CGEN_INSN_OPTIONAL_MUL_INSN))
394 || (MEP_OMASK & (1 << CGEN_INSN_OPTIONAL_DIV_INSN)))
396 if (MEP_OMASK & (1 << CGEN_INSN_OPTIONAL_DEBUG_INSN))
398 if (MEP_OMASK & (1 << CGEN_INSN_OPTIONAL_CP_INSN))
402 r = ((b & 0x00f0) >> 4) | ((b & 0x0001) << 4);
408 as_bad (_("$hi and $lo are disabled when MUL and DIV are off"));
415 as_bad (_("$mb0, $me0, $mb1, and $me1 are disabled when COP is off"));
420 as_bad (_("$dbg and $depc are disabled when DEBUG is off"));
429 switch (MEP_CPU & EF_MEP_CPU_MASK)
432 case EF_MEP_CPU_C2: return bfd_mach_mep;
433 case EF_MEP_CPU_C3: return bfd_mach_mep;
434 case EF_MEP_CPU_C4: return bfd_mach_mep;
435 case EF_MEP_CPU_C5: return bfd_mach_mep_c5;
436 case EF_MEP_CPU_H1: return bfd_mach_mep_h1;
442 /* The MeP version of the cgen parse_operand function. The only difference
443 from the standard version is that we want to avoid treating '$foo' and
444 '($foo...)' as references to a symbol called '$foo'. The chances are
445 that '$foo' is really a misspelt register. */
448 mep_parse_operand (CGEN_CPU_DESC cd, enum cgen_parse_operand_type want,
449 const char **strP, int opindex, int opinfo,
450 enum cgen_parse_operand_result *resultP, bfd_vma *valueP)
452 if (want == CGEN_PARSE_OPERAND_INTEGER || want == CGEN_PARSE_OPERAND_ADDRESS)
460 return "Not a valid literal";
462 return gas_cgen_parse_operand (cd, want, strP, opindex, opinfo,
469 /* Initialize the `cgen' interface. */
471 /* If the user specifies no options, we default to allowing
472 everything. If the user specifies any enabling options, we
473 default to allowing only what is specified. If the user
474 specifies only disabling options, we only disable what is
475 specified. If the user specifies options and a config, the
476 options modify the config. */
477 if (optbits && mep_config_index == 0)
479 MEP_OMASK &= ~OPTION_MASK;
480 MEP_OMASK |= optbits;
483 MEP_OMASK = (MEP_OMASK & ~optbitset) | optbits;
485 mep_cop = mep_config_map[mep_config_index].cpu_flag & EF_MEP_COP_MASK;
487 /* Set the machine number and endian. */
488 gas_cgen_cpu_desc = mep_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0U,
489 CGEN_CPU_OPEN_ENDIAN,
492 : CGEN_ENDIAN_LITTLE,
493 CGEN_CPU_OPEN_ISAS, (CGEN_BITSET *) 0,
495 mep_cgen_init_asm (gas_cgen_cpu_desc);
497 /* This is a callback from cgen to gas to parse operands. */
498 cgen_set_parse_operand_fn (gas_cgen_cpu_desc, mep_parse_operand);
500 /* Identify the architecture. */
501 bfd_default_set_arch_mach (stdoutput, bfd_arch_mep, mep_machine ());
503 /* Store the configuration number and core. */
504 bfd_set_private_flags (stdoutput, MEP_CPU | MEP_CONFIG | library_flag);
506 /* Initialize the array we'll be using to store fixups. */
507 gas_cgen_initialize_saved_fixups_array();
510 /* Variant of mep_cgen_assemble_insn. Assemble insn STR of cpu CD as a
511 coprocessor instruction, if possible, into FIELDS, BUF, and INSN. */
513 static const CGEN_INSN *
514 mep_cgen_assemble_cop_insn (CGEN_CPU_DESC cd,
517 CGEN_INSN_BYTES_PTR buf,
518 const struct cgen_insn *pinsn)
521 CGEN_INSN_LIST *ilist;
522 const char *errmsg = NULL;
524 /* The instructions are stored in hashed lists. */
525 ilist = CGEN_ASM_LOOKUP_INSN (gas_cgen_cpu_desc,
526 CGEN_INSN_MNEMONIC (pinsn));
529 for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
531 const CGEN_INSN *insn = ilist->insn;
532 if (strcmp (CGEN_INSN_MNEMONIC (ilist->insn),
533 CGEN_INSN_MNEMONIC (pinsn)) == 0
534 && MEP_INSN_COP_P (ilist->insn)
535 && mep_cgen_insn_supported (cd, insn))
539 /* skip this insn if str doesn't look right lexically */
540 if (CGEN_INSN_RX (insn) != NULL &&
541 regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
544 /* Allow parse/insert handlers to obtain length of insn. */
545 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
547 errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
551 errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
563 mep_save_insn (mep_insn insn)
565 /* Consider change MAX_SAVED_FIXUP_CHAINS to MAX_PARALLEL_INSNS. */
566 if (num_insns_saved < 0 || num_insns_saved >= MAX_SAVED_FIXUP_CHAINS)
568 as_fatal("index into saved_insns[] out of bounds.");
571 saved_insns[num_insns_saved] = insn;
572 gas_cgen_save_fixups(num_insns_saved);
577 mep_check_parallel32_scheduling (void)
579 int insn0iscopro, insn1iscopro, insn0length, insn1length;
581 /* More than two instructions means that either someone is referring to
582 an internally parallel core or an internally parallel coprocessor,
583 neither of which are supported at this time. */
584 if ( num_insns_saved > 2 )
585 as_fatal("Internally paralled cores and coprocessors not supported.");
587 /* If there are no insns saved, that's ok. Just return. This will
588 happen when mep_process_saved_insns is called when the end of the
589 source file is reached and there are no insns left to be processed. */
590 if (num_insns_saved == 0)
593 /* Check some of the attributes of the first insn. */
594 insn0iscopro = MEP_INSN_COP_P (saved_insns[0].insn);
595 insn0length = CGEN_FIELDS_BITSIZE (& saved_insns[0].fields);
597 if (num_insns_saved == 2)
599 /* Check some of the attributes of the first insn. */
600 insn1iscopro = MEP_INSN_COP_P (saved_insns[1].insn);
601 insn1length = CGEN_FIELDS_BITSIZE (& saved_insns[1].fields);
603 if ((insn0iscopro && !insn1iscopro)
604 || (insn1iscopro && !insn0iscopro))
606 /* We have one core and one copro insn. If their sizes
607 add up to 32, then the combination is valid. */
608 if (insn0length + insn1length == 32)
611 as_bad (_("core and copro insn lengths must total 32 bits."));
614 as_bad (_("vliw group must consist of 1 core and 1 copro insn."));
618 /* If we arrive here, we have one saved instruction. There are a
619 number of possible cases:
621 1. The instruction is a 32 bit core or coprocessor insn and
622 can be executed by itself. Valid.
624 2. The instrucion is a core instruction for which a cop nop
625 exists. In this case, insert the cop nop into the saved
626 insn array after the core insn and return. Valid.
628 3. The instruction is a coprocessor insn for which a core nop
629 exists. In this case, move the coprocessor insn to the
630 second element of the array and put the nop in the first
631 element then return. Valid.
633 4. The instruction is a core or coprocessor instruction for
634 which there is no matching coprocessor or core nop to use
635 to form a valid vliw insn combination. In this case, we
638 if (insn0length > 32)
639 as_fatal ("Cannot use 48- or 64-bit insns with a 32 bit datapath.");
641 if (insn0length == 32)
644 /* Insn is smaller than datapath. If there are no matching
645 nops for this insn, then terminate assembly. */
646 if (CGEN_INSN_ATTR_VALUE (saved_insns[0].insn,
647 CGEN_INSN_VLIW32_NO_MATCHING_NOP))
648 as_fatal ("No valid nop.");
650 /* At this point we know that we have a single 16-bit insn that has
651 a matching nop. We have to assemble it and put it into the saved
652 insn and fixup chain arrays. */
659 /* Move the insn and it's fixups to the second element of the
660 saved insns arrary and insert a 16 bit core nope into the
662 insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "nop",
663 &insn.fields, insn.buffer,
667 as_bad ("%s", errmsg);
671 /* Move the insn in element 0 to element 1 and insert the
672 nop into element 0. Move the fixups in element 0 to
673 element 1 and save the current fixups to element 0.
674 Really there aren't any fixups at this point because we're
675 inserting a nop but we might as well be general so that
676 if there's ever a need to insert a general insn, we'll
678 saved_insns[1] = saved_insns[0];
679 saved_insns[0] = insn;
681 gas_cgen_swap_fixups (0);
682 gas_cgen_save_fixups (1);
688 int insn_num = saved_insns[0].insn->base->num;
690 /* Use 32 bit branches and skip the nop. */
691 if (insn_num == MEP_INSN_BSR12
692 || insn_num == MEP_INSN_BEQZ
693 || insn_num == MEP_INSN_BNEZ)
696 /* Insert a 16-bit coprocessor nop. Note that at the time */
697 /* this was done, no 16-bit coprocessor nop was defined. */
698 insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "cpnop16",
699 &insn.fields, insn.buffer,
703 as_bad ("%s", errmsg);
707 /* Now put the insn and fixups into the arrays. */
708 mep_save_insn (insn);
714 mep_check_parallel64_scheduling (void)
716 int insn0iscopro, insn1iscopro, insn0length, insn1length;
718 /* More than two instructions means that someone is referring to an
719 internally parallel core or an internally parallel coprocessor. */
720 /* These are not currently supported. */
721 if (num_insns_saved > 2)
722 as_fatal ("Internally parallel cores of coprocessors not supported.");
724 /* If there are no insns saved, that's ok. Just return. This will
725 happen when mep_process_saved_insns is called when the end of the
726 source file is reached and there are no insns left to be processed. */
727 if (num_insns_saved == 0)
730 /* Check some of the attributes of the first insn. */
731 insn0iscopro = MEP_INSN_COP_P (saved_insns[0].insn);
732 insn0length = CGEN_FIELDS_BITSIZE (& saved_insns[0].fields);
734 if (num_insns_saved == 2)
736 /* Check some of the attributes of the first insn. */
737 insn1iscopro = MEP_INSN_COP_P (saved_insns[1].insn);
738 insn1length = CGEN_FIELDS_BITSIZE (& saved_insns[1].fields);
740 if ((insn0iscopro && !insn1iscopro)
741 || (insn1iscopro && !insn0iscopro))
743 /* We have one core and one copro insn. If their sizes
744 add up to 64, then the combination is valid. */
745 if (insn0length + insn1length == 64)
748 as_bad (_("core and copro insn lengths must total 64 bits."));
751 as_bad (_("vliw group must consist of 1 core and 1 copro insn."));
755 /* If we arrive here, we have one saved instruction. There are a
756 number of possible cases:
758 1. The instruction is a 64 bit coprocessor insn and can be
759 executed by itself. Valid.
761 2. The instrucion is a core instruction for which a cop nop
762 exists. In this case, insert the cop nop into the saved
763 insn array after the core insn and return. Valid.
765 3. The instruction is a coprocessor insn for which a core nop
766 exists. In this case, move the coprocessor insn to the
767 second element of the array and put the nop in the first
768 element then return. Valid.
770 4. The instruction is a core or coprocessor instruction for
771 which there is no matching coprocessor or core nop to use
772 to form a valid vliw insn combination. In this case, we
775 /* If the insn is 64 bits long, it can run alone. The size check
776 is done indepependantly of whether the insn is core or copro
777 in case 64 bit coprocessor insns are added later. */
778 if (insn0length == 64)
781 /* Insn is smaller than datapath. If there are no matching
782 nops for this insn, then terminate assembly. */
783 if (CGEN_INSN_ATTR_VALUE (saved_insns[0].insn,
784 CGEN_INSN_VLIW64_NO_MATCHING_NOP))
785 as_fatal ("No valid nop.");
792 /* Initialize the insn buffer. */
793 memset (insn.buffer, 0, sizeof(insn.buffer));
795 /* We have a coprocessor insn. At this point in time there
796 are is 32-bit core nop. There is only a 16-bit core
797 nop. The idea is to allow for a relatively arbitrary
798 coprocessor to be specified. We aren't looking at
799 trying to cover future changes in the core at this time
800 since it is assumed that the core will remain fairly
801 static. If there ever are 32 or 48 bit core nops added,
802 they will require entries below. */
804 if (insn0length == 48)
806 /* Move the insn and fixups to the second element of the
807 arrays then assemble and insert a 16 bit core nop. */
808 insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "nop",
809 & insn.fields, insn.buffer,
814 /* If this is reached, then we have a single coprocessor
815 insn that is not 48 bits long, but for which the assembler
816 thinks there is a matching core nop. If a 32-bit core
817 nop has been added, then make the necessary changes and
818 handle its assembly and insertion here. Otherwise,
819 go figure out why either:
821 1. The assembler thinks that there is a 32-bit core nop
822 to match a 32-bit coprocessor insn, or
823 2. The assembler thinks that there is a 48-bit core nop
824 to match a 16-bit coprocessor insn. */
826 as_fatal ("Assembler expects a non-existent core nop.");
831 as_bad ("%s", errmsg);
835 /* Move the insn in element 0 to element 1 and insert the
836 nop into element 0. Move the fixups in element 0 to
837 element 1 and save the current fixups to element 0.
838 Really there aren't any fixups at this point because we're
839 inserting a nop but we might as well be general so that
840 if there's ever a need to insert a general insn, we'll
843 saved_insns[1] = saved_insns[0];
844 saved_insns[0] = insn;
846 gas_cgen_swap_fixups(0);
847 gas_cgen_save_fixups(1);
855 /* Initialize the insn buffer */
856 memset (insn.buffer, 0, sizeof(insn.buffer));
858 /* We have a core insn. We have to handle all possible nop
859 lengths. If a coprocessor doesn't have a nop of a certain
860 length but there exists core insns that when combined with
861 a nop of that length would fill the datapath, those core
862 insns will be flagged with the VLIW_NO_CORRESPONDING_NOP
863 attribute. That will ensure that when used in a way that
864 requires a nop to be inserted, assembly will terminate
865 before reaching this section of code. This guarantees
866 that cases below which would result in the attempted
867 insertion of nop that doesn't exist will never be entered. */
868 if (insn0length == 16)
870 /* Insert 48 bit coprocessor nop. */
871 /* Assemble it and put it into the arrays. */
872 insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "cpnop48",
873 &insn.fields, insn.buffer,
876 else if (insn0length == 32)
878 /* Insert 32 bit coprocessor nop. */
879 insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "cpnop32",
880 &insn.fields, insn.buffer,
883 else if (insn0length == 48)
885 /* Insert 16 bit coprocessor nop. */
886 insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "cpnop16",
887 &insn.fields, insn.buffer,
891 /* Core insn has an invalid length. Something has gone wrong. */
892 as_fatal ("Core insn has invalid length! Something is wrong!");
896 as_bad ("%s", errmsg);
900 /* Now put the insn and fixups into the arrays. */
901 mep_save_insn (insn);
906 #ifdef MEP_IVC2_SUPPORTED
908 /* IVC2 packing is different than other VLIW coprocessors. Many of
909 the COP insns can be placed in any of three different types of
910 slots, and each bundle can hold up to three insns - zero or one
911 core insns and one or two IVC2 insns. The insns in CGEN are tagged
912 with which slots they're allowed in, and we have to decide based on
913 that whether or not the user had given us a possible bundling. */
916 slot_ok (int idx, int slot)
918 const CGEN_INSN *insn = saved_insns[idx].insn;
919 return CGEN_ATTR_CGEN_INSN_SLOTS_VALUE (CGEN_INSN_ATTRS (insn)) & (1 << slot);
923 mep_check_ivc2_scheduling (void)
927 V1 [-----core-----][--------p0s-------][------------p1------------]
928 V2 [-------------core-------------]xxxx[------------p1------------]
929 V3 1111[--p0--]0111[--------p0--------][------------p1------------]
932 int slots[5]; /* Indexed off the SLOTS_ATTR enum. */
933 int corelength, realcorelength;
937 int e = target_big_endian ? 0 : 1;
939 /* If there are no insns saved, that's ok. Just return. This will
940 happen when mep_process_saved_insns is called when the end of the
941 source file is reached and there are no insns left to be processed. */
942 if (num_insns_saved == 0)
948 if (slot_ok (0, SLOTS_CORE))
950 slots[SLOTS_CORE] = 0;
951 realcorelength = corelength = CGEN_FIELDS_BITSIZE (& saved_insns[0].fields);
953 /* If we encounter one of these, it may get relaxed later into a
954 longer instruction. We can't just push the other opcodes
955 away, the bigger insn has to fit into the existing slot. So,
956 we make room for the relaxed instruction here. */
958 if (saved_insns[0].insn->base->num == MEP_INSN_BSR12
959 || saved_insns[0].insn->base->num == MEP_INSN_BRA)
963 realcorelength = corelength = 0;
965 if (corelength == 16)
967 /* V1 mode: we need a P0S slot and a P1 slot. */
968 switch (num_insns_saved)
971 /* No other insns, fill with NOPs. */
975 if (slot_ok (1, SLOTS_P1))
977 else if (slot_ok (1, SLOTS_P0S))
978 slots[SLOTS_P0S] = 1;
980 as_bad (_("cannot pack %s with a 16-bit insn"),
981 CGEN_INSN_NAME (saved_insns[1].insn));
985 if (slot_ok (1, SLOTS_P0S)
986 && slot_ok (2, SLOTS_P1))
988 slots[SLOTS_P0S] = 1;
991 else if (slot_ok (1, SLOTS_P1)
992 && slot_ok (2, SLOTS_P0S))
995 slots[SLOTS_P0S] = 2;
998 as_bad (_("cannot pack %s and %s together with a 16-bit insn"),
999 CGEN_INSN_NAME (saved_insns[1].insn),
1000 CGEN_INSN_NAME (saved_insns[2].insn));
1004 as_bad (_("too many IVC2 insns to pack with a 16-bit core insn"));
1008 else if (corelength == 32)
1010 /* V2 mode: we need a P1 slot. */
1011 switch (num_insns_saved)
1014 /* No other insns, fill with NOPs. */
1017 /* The other insn must allow P1. */
1018 if (!slot_ok (1, SLOTS_P1))
1019 as_bad (_("cannot pack %s into slot P1"),
1020 CGEN_INSN_NAME (saved_insns[1].insn));
1022 slots[SLOTS_P1] = 1;
1025 as_bad (_("too many IVC2 insns to pack with a 32-bit core insn"));
1029 else if (corelength == 0)
1031 /* V3 mode: we need a P0 slot and a P1 slot, or a P0S+P1 with a
1033 switch (num_insns_saved)
1036 if (slot_ok (0, SLOTS_P0))
1037 slots[SLOTS_P0] = 0;
1038 else if (slot_ok (0, SLOTS_P1))
1039 slots[SLOTS_P1] = 0;
1040 else if (slot_ok (0, SLOTS_P0S))
1041 slots[SLOTS_P0S] = 0;
1043 as_bad (_("unable to pack %s by itself?"),
1044 CGEN_INSN_NAME (saved_insns[0].insn));
1048 if (slot_ok (0, SLOTS_P0)
1049 && slot_ok (1, SLOTS_P1))
1051 slots[SLOTS_P0] = 0;
1052 slots[SLOTS_P1] = 1;
1054 else if (slot_ok (0, SLOTS_P1)
1055 && slot_ok (1, SLOTS_P0))
1057 slots[SLOTS_P1] = 0;
1058 slots[SLOTS_P0] = 1;
1060 else if (slot_ok (0, SLOTS_P0S)
1061 && slot_ok (1, SLOTS_P1))
1063 slots[SLOTS_P0S] = 0;
1064 slots[SLOTS_P1] = 1;
1066 else if (slot_ok (0, SLOTS_P1)
1067 && slot_ok (1, SLOTS_P0S))
1069 slots[SLOTS_P1] = 0;
1070 slots[SLOTS_P0S] = 1;
1073 as_bad (_("cannot pack %s and %s together"),
1074 CGEN_INSN_NAME (saved_insns[0].insn),
1075 CGEN_INSN_NAME (saved_insns[1].insn));
1079 as_bad (_("too many IVC2 insns to pack together"));
1084 /* The core insn needs to be done normally so that fixups,
1085 relaxation, etc are done. Other IVC2 insns need only be resolved
1086 to bit patterns; there are no relocations for them. */
1087 if (slots[SLOTS_CORE] != -1)
1089 gas_cgen_restore_fixups (0);
1090 gas_cgen_finish_insn (saved_insns[0].insn, saved_insns[0].buffer,
1091 CGEN_FIELDS_BITSIZE (& saved_insns[0].fields),
1095 /* Allocate whatever bytes remain in our insn word. Adjust the
1096 pointer to point (as if it were) to the beginning of the whole
1097 word, so that we don't have to adjust for it elsewhere. */
1098 f = (bfd_byte *) frag_more (8 - realcorelength / 8);
1099 /* Unused slots are filled with NOPs, which happen to be all zeros. */
1100 memset (f, 0, 8 - realcorelength / 8);
1101 f -= realcorelength / 8;
1110 m = & saved_insns[slots[i]];
1113 cgen_put_insn_value (gas_cgen_cpu_desc, (unsigned char *) temp, 32,
1116 memcpy (temp, m->buffer, byte_len);
1124 f[4^e] |= temp[3^e] & 0xf0;
1127 f[0^e] = 0xf0 | temp[0^e] >> 4;
1128 f[1^e] = temp[0^e] << 4 | 0x07;
1131 f[4^e] |= temp[3^e] & 0xf0;
1134 f[4^e] |= temp[0^e] >> 4;
1135 f[5^e] = temp[0^e] << 4 | temp[1^e] >> 4;
1136 f[6^e] = temp[1^e] << 4 | temp[2^e] >> 4;
1137 f[7^e] = temp[2^e] << 4 | temp[3^e] >> 4;
1145 #endif /* MEP_IVC2_SUPPORTED */
1147 /* The scheduling functions are just filters for invalid combinations.
1148 If there is a violation, they terminate assembly. Otherise they
1149 just fall through. Successful combinations cause no side effects
1150 other than valid nop insertion. */
1153 mep_check_parallel_scheduling (void)
1155 /* This is where we will eventually read the config information
1156 and choose which scheduling checking function to call. */
1157 #ifdef MEP_IVC2_SUPPORTED
1158 if (mep_cop == EF_MEP_COP_IVC2)
1159 mep_check_ivc2_scheduling ();
1161 #endif /* MEP_IVC2_SUPPORTED */
1163 mep_check_parallel64_scheduling ();
1165 mep_check_parallel32_scheduling ();
1169 mep_process_saved_insns (void)
1173 gas_cgen_save_fixups (MAX_SAVED_FIXUP_CHAINS - 1);
1175 /* We have to check for valid scheduling here. */
1176 mep_check_parallel_scheduling ();
1178 /* IVC2 has to pack instructions in a funny way, so it does it
1180 if (mep_cop != EF_MEP_COP_IVC2)
1182 /* If the last call didn't cause assembly to terminate, we have
1183 a valid vliw insn/insn pair saved. Restore this instructions'
1184 fixups and process the insns. */
1185 for (i = 0;i<num_insns_saved;i++)
1187 gas_cgen_restore_fixups (i);
1188 gas_cgen_finish_insn (saved_insns[i].insn, saved_insns[i].buffer,
1189 CGEN_FIELDS_BITSIZE (& saved_insns[i].fields),
1193 gas_cgen_restore_fixups (MAX_SAVED_FIXUP_CHAINS - 1);
1195 /* Clear the fixups and reset the number insn saved to 0. */
1196 gas_cgen_initialize_saved_fixups_array ();
1197 num_insns_saved = 0;
1198 listing_prev_line ();
1202 md_assemble (char * str)
1204 static CGEN_BITSET* isas = NULL;
1207 /* Initialize GAS's cgen interface for a new instruction. */
1208 gas_cgen_init_parse ();
1210 /* There are two possible modes: core and vliw. We have to assemble
1211 differently for each.
1213 Core Mode: We assemble normally. All instructions are on a
1214 single line and are made up of one mnemonic and one
1216 VLIW Mode: Vliw combinations are indicated as follows:
1221 We want to handle the general case where more than
1222 one instruction can be preceded by a +. This will
1223 happen later if we add support for internally parallel
1224 coprocessors. We'll make the parsing nice and general
1225 so that it can handle an arbitrary number of insns
1226 with leading +'s. The actual checking for valid
1227 combinations is done elsewhere. */
1229 /* Initialize the isa to refer to the core. */
1231 isas = cgen_bitset_copy (& MEP_CORE_ISA);
1234 cgen_bitset_clear (isas);
1235 cgen_bitset_union (isas, & MEP_CORE_ISA, isas);
1237 gas_cgen_cpu_desc->isas = isas;
1243 int thisInsnIsCopro = 0;
1247 /* Initialize the insn buffer */
1249 if (! CGEN_INT_INSN_P)
1250 for (i=0; i < CGEN_MAX_INSN_SIZE; i++)
1251 insn.buffer[i]='\0';
1254 /* IVC2 has two sets of coprocessor opcodes, one for CORE mode
1255 and one for VLIW mode. They have the same names. To specify
1256 which one we want, we use the COP isas - the 32 bit ISA is
1257 for the core instructions (which are always 32 bits), and the
1258 other ISAs are for the VLIW ones (which always pack into 64
1259 bit insns). We use other attributes to determine slotting
1261 if (mep_cop == EF_MEP_COP_IVC2)
1263 cgen_bitset_union (isas, & MEP_COP16_ISA, isas);
1264 cgen_bitset_union (isas, & MEP_COP48_ISA, isas);
1265 cgen_bitset_union (isas, & MEP_COP64_ISA, isas);
1269 /* Can't tell core / copro insns apart at parse time! */
1270 cgen_bitset_union (isas, & MEP_COP_ISA, isas);
1273 /* Assemble the insn so we can examine its attributes. */
1274 insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, str,
1275 &insn.fields, insn.buffer,
1279 as_bad ("%s", errmsg);
1282 mep_check_for_disabled_registers (&insn);
1284 /* Check to see if it's a coprocessor instruction. */
1285 thisInsnIsCopro = MEP_INSN_COP_P (insn.insn);
1287 if (!thisInsnIsCopro)
1289 insn.insn = mep_cgen_assemble_cop_insn (gas_cgen_cpu_desc, str,
1290 &insn.fields, insn.buffer,
1292 thisInsnIsCopro = MEP_INSN_COP_P (insn.insn);
1293 mep_check_for_disabled_registers (&insn);
1298 /* A plus was present. */
1299 /* Check for a + with a core insn and abort if found. */
1300 if (!thisInsnIsCopro)
1302 as_fatal("A core insn cannot be preceded by a +.\n");
1306 if (num_insns_saved > 0)
1308 /* There are insns in the queue. Add this one. */
1309 mep_save_insn (insn);
1313 /* There are no insns in the queue and a plus is present.
1314 This is a syntax error. Let's not tolerate this.
1315 We can relax this later if necessary. */
1316 as_bad (_("Invalid use of parallelization operator."));
1322 /* No plus was present. */
1323 if (num_insns_saved > 0)
1325 /* There are insns saved and we came across an insn without a
1326 leading +. That's the signal to process the saved insns
1327 before proceeding then treat the current insn as the first
1328 in a new vliw group. */
1329 mep_process_saved_insns ();
1330 num_insns_saved = 0;
1331 /* mep_save_insn (insn); */
1333 mep_save_insn (insn);
1338 /* Core Insn. Add it to the beginning of the queue. */
1339 mep_save_insn (insn);
1340 /* gas_cgen_save_fixups(num_insns_saved); */
1351 /* Only single instructions are assembled in core mode. */
1354 /* See comment in the VLIW clause above about this. */
1355 if (mep_cop & EF_MEP_COP_IVC2)
1356 cgen_bitset_union (isas, & MEP_COP32_ISA, isas);
1358 /* If a leading '+' was present, issue an error.
1359 That's not allowed in core mode. */
1362 as_bad (_("Leading plus sign not allowed in core mode"));
1366 insn.insn = mep_cgen_assemble_insn
1367 (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
1371 as_bad ("%s", errmsg);
1374 gas_cgen_finish_insn (insn.insn, insn.buffer,
1375 CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
1376 mep_check_for_disabled_registers (&insn);
1381 md_section_align (segT segment, valueT size)
1383 int align = bfd_get_section_alignment (stdoutput, segment);
1384 return ((size + (1 << align) - 1) & -(1 << align));
1389 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
1394 /* Interface to relax_segment. */
1397 const relax_typeS md_relax_table[] =
1400 1) most positive reach of this state,
1401 2) most negative reach of this state,
1402 3) how many bytes this mode will have in the variable part of the frag
1403 4) which index into the table to try if we can't fit into this one. */
1404 /* Note that we use "beq" because "jmp" has a peculiarity - it cannot
1405 jump to addresses with any bits 27..24 set. So, we use beq as a
1406 17-bit pc-relative branch to avoid using jmp, just in case. */
1408 /* 0 */ { 0, 0, 0, 0 }, /* unused */
1409 /* 1 */ { 0, 0, 0, 0 }, /* marker for "don't know yet" */
1411 /* 2 */ { 2047, -2048, 0, 3 }, /* bsr12 */
1412 /* 3 */ { 0, 0, 2, 0 }, /* bsr16 */
1414 /* 4 */ { 2047, -2048, 0, 5 }, /* bra */
1415 /* 5 */ { 65535, -65536, 2, 6 }, /* beq $0,$0 */
1416 /* 6 */ { 0, 0, 2, 0 }, /* jmp24 */
1418 /* 7 */ { 65535, -65536, 0, 8 }, /* beqi */
1419 /* 8 */ { 0, 0, 4, 0 }, /* bnei/jmp */
1421 /* 9 */ { 127, -128, 0, 10 }, /* beqz */
1422 /* 10 */ { 65535, -65536, 2, 11 }, /* beqi */
1423 /* 11 */ { 0, 0, 4, 0 }, /* bnei/jmp */
1425 /* 12 */ { 65535, -65536, 0, 13 }, /* bnei */
1426 /* 13 */ { 0, 0, 4, 0 }, /* beqi/jmp */
1428 /* 14 */ { 127, -128, 0, 15 }, /* bnez */
1429 /* 15 */ { 65535, -65536, 2, 16 }, /* bnei */
1430 /* 16 */ { 0, 0, 4, 0 }, /* beqi/jmp */
1432 /* 17 */ { 65535, -65536, 0, 13 }, /* bgei */
1433 /* 18 */ { 0, 0, 4, 0 },
1434 /* 19 */ { 65535, -65536, 0, 13 }, /* blti */
1435 /* 20 */ { 0, 0, 4, 0 },
1436 /* 19 */ { 65535, -65536, 0, 13 }, /* bcpeq */
1437 /* 20 */ { 0, 0, 4, 0 },
1438 /* 19 */ { 65535, -65536, 0, 13 }, /* bcpne */
1439 /* 20 */ { 0, 0, 4, 0 },
1440 /* 19 */ { 65535, -65536, 0, 13 }, /* bcpat */
1441 /* 20 */ { 0, 0, 4, 0 },
1442 /* 19 */ { 65535, -65536, 0, 13 }, /* bcpaf */
1443 /* 20 */ { 0, 0, 4, 0 }
1446 /* Pseudo-values for 64 bit "insns" which are combinations of two 32
1450 MEP_PSEUDO64_16BITCC,
1451 MEP_PSEUDO64_32BITCC,
1452 } MepPseudo64Values;
1457 int insn_for_extern;
1458 } subtype_mappings[] = {
1461 { MEP_INSN_BSR12, 0, MEP_INSN_BSR24 },
1462 { MEP_INSN_BSR24, 2, MEP_INSN_BSR24 },
1463 { MEP_INSN_BRA, 0, MEP_INSN_BRA },
1464 { MEP_INSN_BEQ, 2, MEP_INSN_BEQ },
1465 { MEP_INSN_JMP, 2, MEP_INSN_JMP },
1466 { MEP_INSN_BEQI, 0, MEP_INSN_BEQI },
1467 { -1, 4, MEP_PSEUDO64_32BITCC },
1468 { MEP_INSN_BEQZ, 0, MEP_INSN_BEQZ },
1469 { MEP_INSN_BEQI, 2, MEP_INSN_BEQI },
1470 { -1, 4, MEP_PSEUDO64_16BITCC },
1471 { MEP_INSN_BNEI, 0, MEP_INSN_BNEI },
1472 { -1, 4, MEP_PSEUDO64_32BITCC },
1473 { MEP_INSN_BNEZ, 0, MEP_INSN_BNEZ },
1474 { MEP_INSN_BNEI, 2, MEP_INSN_BNEI },
1475 { -1, 4, MEP_PSEUDO64_16BITCC },
1476 { MEP_INSN_BGEI, 0, MEP_INSN_BGEI },
1477 { -1, 4, MEP_PSEUDO64_32BITCC },
1478 { MEP_INSN_BLTI, 0, MEP_INSN_BLTI },
1479 { -1, 4, MEP_PSEUDO64_32BITCC },
1480 { MEP_INSN_BCPEQ, 0, MEP_INSN_BCPEQ },
1481 { -1, 4, MEP_PSEUDO64_32BITCC },
1482 { MEP_INSN_BCPNE, 0, MEP_INSN_BCPNE },
1483 { -1, 4, MEP_PSEUDO64_32BITCC },
1484 { MEP_INSN_BCPAT, 0, MEP_INSN_BCPAT },
1485 { -1, 4, MEP_PSEUDO64_32BITCC },
1486 { MEP_INSN_BCPAF, 0, MEP_INSN_BCPAF },
1487 { -1, 4, MEP_PSEUDO64_32BITCC }
1489 #define NUM_MAPPINGS (sizeof (subtype_mappings) / sizeof (subtype_mappings[0]))
1492 mep_prepare_relax_scan (fragS *fragP, offsetT *aim, relax_substateT this_state)
1494 symbolS *symbolP = fragP->fr_symbol;
1495 if (symbolP && !S_IS_DEFINED (symbolP))
1497 /* Adjust for MeP pcrel not being relative to the next opcode. */
1498 *aim += 2 + md_relax_table[this_state].rlx_length;
1502 insn_to_subtype (int insn)
1505 for (i=0; i<NUM_MAPPINGS; i++)
1506 if (insn == subtype_mappings[i].insn)
1511 /* Return an initial guess of the length by which a fragment must grow
1512 to hold a branch to reach its destination. Also updates fr_type
1513 and fr_subtype as necessary.
1515 Called just before doing relaxation. Any symbol that is now
1516 undefined will not become defined. The guess for fr_var is
1517 ACTUALLY the growth beyond fr_fix. Whatever we do to grow fr_fix
1518 or fr_var contributes to our returned value. Although it may not
1519 be explicit in the frag, pretend fr_var starts with a 0 value. */
1522 md_estimate_size_before_relax (fragS * fragP, segT segment)
1524 if (fragP->fr_subtype == 1)
1525 fragP->fr_subtype = insn_to_subtype (fragP->fr_cgen.insn->base->num);
1527 if (S_GET_SEGMENT (fragP->fr_symbol) != segment
1528 || S_IS_WEAK (fragP->fr_symbol)
1529 #ifdef MEP_IVC2_SUPPORTED
1530 || (mep_cop == EF_MEP_COP_IVC2
1531 && bfd_get_section_flags (stdoutput, segment) & SEC_MEP_VLIW)
1532 #endif /* MEP_IVC2_SUPPORTED */
1537 new_insn = subtype_mappings[fragP->fr_subtype].insn_for_extern;
1538 fragP->fr_subtype = insn_to_subtype (new_insn);
1541 if (MEP_VLIW && ! MEP_VLIW64
1542 && (bfd_get_section_flags (stdoutput, segment) & SEC_MEP_VLIW))
1544 /* Use 32 bit branches for vliw32 so the vliw word is not split. */
1545 switch (fragP->fr_cgen.insn->base->num)
1547 case MEP_INSN_BSR12:
1548 fragP->fr_subtype = insn_to_subtype
1549 (subtype_mappings[fragP->fr_subtype].insn_for_extern);
1552 fragP->fr_subtype ++;
1555 fragP->fr_subtype ++;
1560 if (fragP->fr_cgen.insn->base
1561 && fragP->fr_cgen.insn->base->num
1562 != subtype_mappings[fragP->fr_subtype].insn)
1564 int new_insn= subtype_mappings[fragP->fr_subtype].insn;
1567 fragP->fr_cgen.insn = (fragP->fr_cgen.insn
1568 - fragP->fr_cgen.insn->base->num
1573 #ifdef MEP_IVC2_SUPPORTED
1574 if (mep_cop == EF_MEP_COP_IVC2
1575 && bfd_get_section_flags (stdoutput, segment) & SEC_MEP_VLIW)
1577 #endif /* MEP_IVC2_SUPPORTED */
1579 return subtype_mappings[fragP->fr_subtype].growth;
1582 /* VLIW does relaxing, but not growth. */
1585 mep_relax_frag (segT segment, fragS *fragP, long stretch)
1587 long rv = relax_frag (segment, fragP, stretch);
1588 #ifdef MEP_IVC2_SUPPORTED
1589 if (mep_cop == EF_MEP_COP_IVC2
1590 && bfd_get_section_flags (stdoutput, segment) & SEC_MEP_VLIW)
1596 /* *fragP has been relaxed to its final size, and now needs to have
1597 the bytes inside it modified to conform to the new size.
1599 Called after relaxation is finished.
1600 fragP->fr_type == rs_machine_dependent.
1601 fragP->fr_subtype is the subtype of what the address relaxed to. */
1604 target_address_for (fragS *frag)
1606 int rv = frag->fr_offset;
1607 symbolS *sym = frag->fr_symbol;
1610 rv += S_GET_VALUE (sym);
1616 md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED,
1617 segT seg ATTRIBUTE_UNUSED,
1620 int addend, rn, bit = 0;
1622 int where = fragP->fr_opcode - fragP->fr_literal;
1623 int e = target_big_endian ? 0 : 1;
1626 #ifdef MEP_IVC2_SUPPORTED
1627 if (bfd_get_section_flags (stdoutput, seg) & SEC_MEP_VLIW
1628 && mep_cop == EF_MEP_COP_IVC2)
1631 #endif /* MEP_IVC2_SUPPORTED */
1634 addend = target_address_for (fragP) - (fragP->fr_address + where);
1636 if (subtype_mappings[fragP->fr_subtype].insn == -1)
1639 fragP->fr_fix += subtype_mappings[fragP->fr_subtype].growth;
1640 switch (subtype_mappings[fragP->fr_subtype].insn_for_extern)
1642 case MEP_PSEUDO64_16BITCC:
1643 fragP->fr_opcode[1^e] = ((fragP->fr_opcode[1^e] & 1) ^ 1) | 0x06;
1644 fragP->fr_opcode[2^e] = 0xd8;
1645 fragP->fr_opcode[3^e] = 0x08;
1646 fragP->fr_opcode[4^e] = 0;
1647 fragP->fr_opcode[5^e] = 0;
1650 case MEP_PSEUDO64_32BITCC:
1651 if (fragP->fr_opcode[0^e] & 0x10)
1652 fragP->fr_opcode[1^e] ^= 0x01;
1654 fragP->fr_opcode[1^e] ^= 0x04;
1655 fragP->fr_opcode[2^e] = 0;
1656 fragP->fr_opcode[3^e] = 4;
1657 fragP->fr_opcode[4^e] = 0xd8;
1658 fragP->fr_opcode[5^e] = 0x08;
1659 fragP->fr_opcode[6^e] = 0;
1660 fragP->fr_opcode[7^e] = 0;
1666 fragP->fr_cgen.insn = (fragP->fr_cgen.insn
1667 - fragP->fr_cgen.insn->base->num
1669 operand = MEP_OPERAND_PCABS24A2;
1672 switch (fragP->fr_cgen.insn->base->num)
1674 case MEP_INSN_BSR12:
1675 fragP->fr_opcode[0^e] = 0xb0 | ((addend >> 8) & 0x0f);
1676 fragP->fr_opcode[1^e] = 0x01 | (addend & 0xfe);
1677 operand = MEP_OPERAND_PCREL12A2;
1680 case MEP_INSN_BSR24:
1683 fragP->fr_opcode[0^e] = 0xd8 | ((addend >> 5) & 0x07);
1684 fragP->fr_opcode[1^e] = 0x09 | ((addend << 3) & 0xf0);
1685 fragP->fr_opcode[2^e] = 0x00 | ((addend >>16) & 0xff);
1686 fragP->fr_opcode[3^e] = 0x00 | ((addend >> 8) & 0xff);
1687 operand = MEP_OPERAND_PCREL24A2;
1691 fragP->fr_opcode[0^e] = 0xb0 | ((addend >> 8) & 0x0f);
1692 fragP->fr_opcode[1^e] = 0x00 | (addend & 0xfe);
1693 operand = MEP_OPERAND_PCREL12A2;
1697 /* The default relax_frag doesn't change the state if there is no
1698 growth, so we must manually handle converting out-of-range BEQ
1699 instructions to JMP. */
1700 if (addend <= 65535 && addend >= -65536)
1704 fragP->fr_opcode[0^e] = 0xe0;
1705 fragP->fr_opcode[1^e] = 0x01;
1706 fragP->fr_opcode[2^e] = 0x00 | ((addend >> 9) & 0xff);
1707 fragP->fr_opcode[3^e] = 0x00 | ((addend >> 1) & 0xff);
1708 operand = MEP_OPERAND_PCREL17A2;
1714 addend = target_address_for (fragP);
1717 fragP->fr_opcode[0^e] = 0xd8 | ((addend >> 5) & 0x07);
1718 fragP->fr_opcode[1^e] = 0x08 | ((addend << 3) & 0xf0);
1719 fragP->fr_opcode[2^e] = 0x00 | ((addend >>16) & 0xff);
1720 fragP->fr_opcode[3^e] = 0x00 | ((addend >> 8) & 0xff);
1721 operand = MEP_OPERAND_PCABS24A2;
1728 fragP->fr_opcode[1^e] = bit | (addend & 0xfe);
1729 operand = MEP_OPERAND_PCREL8A2;
1736 if (subtype_mappings[fragP->fr_subtype].growth)
1739 fragP->fr_fix += subtype_mappings[fragP->fr_subtype].growth;
1740 rn = fragP->fr_opcode[0^e] & 0x0f;
1741 fragP->fr_opcode[0^e] = 0xe0 | rn;
1742 fragP->fr_opcode[1^e] = bit;
1744 fragP->fr_opcode[2^e] = 0x00 | ((addend >> 9) & 0xff);
1745 fragP->fr_opcode[3^e] = 0x00 | ((addend >> 1) & 0xff);
1746 operand = MEP_OPERAND_PCREL17A2;
1751 case MEP_INSN_BCPEQ:
1752 case MEP_INSN_BCPNE:
1753 case MEP_INSN_BCPAT:
1754 case MEP_INSN_BCPAF:
1755 /* No opcode change needed, just operand. */
1756 fragP->fr_opcode[2^e] = (addend >> 9) & 0xff;
1757 fragP->fr_opcode[3^e] = (addend >> 1) & 0xff;
1758 operand = MEP_OPERAND_PCREL17A2;
1765 if (S_GET_SEGMENT (fragP->fr_symbol) != seg
1766 || S_IS_WEAK (fragP->fr_symbol)
1767 || operand == MEP_OPERAND_PCABS24A2)
1769 gas_assert (fragP->fr_cgen.insn != 0);
1770 gas_cgen_record_fixup (fragP,
1772 fragP->fr_cgen.insn,
1773 (fragP->fr_fix - where) * 8,
1774 cgen_operand_lookup_by_num (gas_cgen_cpu_desc,
1776 fragP->fr_cgen.opinfo,
1777 fragP->fr_symbol, fragP->fr_offset);
1782 /* Functions concerning relocs. */
1785 mep_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED)
1787 /* If we already know the fixup value, adjust it in the same
1788 way that the linker would have done. */
1789 if (fixP->fx_addsy == 0)
1790 switch (fixP->fx_cgen.opinfo)
1792 case BFD_RELOC_MEP_LOW16:
1793 *valP = ((long)(*valP & 0xffff)) << 16 >> 16;
1795 case BFD_RELOC_MEP_HI16U:
1798 case BFD_RELOC_MEP_HI16S:
1799 *valP = (*valP + 0x8000) >> 16;
1803 /* Now call cgen's md_aply_fix. */
1804 gas_cgen_md_apply_fix (fixP, valP, seg);
1808 md_pcrel_from_section (fixS *fixP, segT sec)
1810 if (fixP->fx_addsy != (symbolS *) NULL
1811 && (! S_IS_DEFINED (fixP->fx_addsy)
1812 || S_IS_WEAK (fixP->fx_addsy)
1813 || S_GET_SEGMENT (fixP->fx_addsy) != sec))
1814 /* The symbol is undefined (or is defined but not in this section).
1815 Let the linker figure it out. */
1818 /* If we've got other reasons for emitting this relocation, let the
1819 linker handle pc-rel also. */
1820 if (mep_force_relocation (fixP))
1823 /* Return the address of the opcode - cgen adjusts for opcode size
1824 itself, to be consistent with the disassembler, which must do
1826 return fixP->fx_where + fixP->fx_frag->fr_address;
1829 /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
1830 Returns BFD_RELOC_NONE if no reloc type can be found.
1831 *FIXP may be modified if desired. */
1833 #if defined (__STDC__) || defined (ALMOST_STDC) || defined (HAVE_STRINGIZE)
1834 #define MAP(n) case MEP_OPERAND_##n: return BFD_RELOC_MEP_##n;
1836 #define MAP(n) case MEP_OPERAND_/**/n: return BFD_RELOC_MEP_/**/n;
1839 bfd_reloc_code_real_type
1840 md_cgen_lookup_reloc (const CGEN_INSN *insn ATTRIBUTE_UNUSED,
1841 const CGEN_OPERAND *operand,
1844 enum bfd_reloc_code_real reloc = fixP->fx_cgen.opinfo;
1845 static char printed[MEP_OPERAND_MAX] = { 0 };
1847 /* If there's a reloc here, it's because the parser saw a %foo() and
1848 is giving us the correct reloc to use, or because we converted to
1849 a different size reloc below and want to avoid "converting" more
1851 if (reloc && reloc != BFD_RELOC_NONE)
1854 switch (operand->type)
1856 MAP (PCREL8A2); /* beqz */
1857 MAP (PCREL12A2); /* bsr16 */
1858 MAP (PCREL17A2); /* beqi */
1859 MAP (PCREL24A2); /* bsr24 */
1860 MAP (PCABS24A2); /* jmp */
1861 MAP (UIMM24); /* mov */
1862 MAP (ADDR24A4); /* sw/lw */
1864 /* The rest of the relocs should be generated by the parser,
1865 for things such as %tprel(), etc. */
1866 case MEP_OPERAND_SIMM16:
1867 #ifdef OBJ_COMPLEX_RELC
1868 /* coalescing this into RELOC_MEP_16 is actually a bug,
1869 since it's a signed operand. let the relc code handle it. */
1870 return BFD_RELOC_RELC;
1873 case MEP_OPERAND_UIMM16:
1874 case MEP_OPERAND_SDISP16:
1875 case MEP_OPERAND_CODE16:
1876 fixP->fx_where += 2;
1877 /* to avoid doing the above add twice */
1878 fixP->fx_cgen.opinfo = BFD_RELOC_MEP_16;
1879 return BFD_RELOC_MEP_16;
1882 #ifdef OBJ_COMPLEX_RELC
1883 /* this is not an error, yet.
1884 pass it to the linker. */
1885 return BFD_RELOC_RELC;
1887 if (printed[operand->type])
1888 return BFD_RELOC_NONE;
1889 printed[operand->type] = 1;
1891 as_bad_where (fixP->fx_file, fixP->fx_line,
1892 _("Don't know how to relocate plain operands of type %s"),
1895 /* Print some helpful hints for the user. */
1896 switch (operand->type)
1898 case MEP_OPERAND_UDISP7:
1899 case MEP_OPERAND_UDISP7A2:
1900 case MEP_OPERAND_UDISP7A4:
1901 as_bad_where (fixP->fx_file, fixP->fx_line,
1902 _("Perhaps you are missing %%tpoff()?"));
1907 return BFD_RELOC_NONE;
1911 /* Called while parsing an instruction to create a fixup.
1912 We need to check for HI16 relocs and queue them up for later sorting. */
1915 mep_cgen_record_fixup_exp (fragS *frag,
1917 const CGEN_INSN *insn,
1919 const CGEN_OPERAND *operand,
1923 fixS * fixP = gas_cgen_record_fixup_exp (frag, where, insn, length,
1924 operand, opinfo, exp);
1928 /* Return BFD reloc type from opinfo field in a fixS.
1929 It's tricky using fx_r_type in mep_frob_file because the values
1930 are BFD_RELOC_UNUSED + operand number. */
1931 #define FX_OPINFO_R_TYPE(f) ((f)->fx_cgen.opinfo)
1933 /* Sort any unmatched HI16 relocs so that they immediately precede
1934 the corresponding LO16 reloc. This is called before md_apply_fix and
1938 mep_frob_file (void)
1940 struct mep_hi_fixup * l;
1942 for (l = mep_hi_fixup_list; l != NULL; l = l->next)
1944 segment_info_type * seginfo;
1947 gas_assert (FX_OPINFO_R_TYPE (l->fixp) == BFD_RELOC_HI16
1948 || FX_OPINFO_R_TYPE (l->fixp) == BFD_RELOC_LO16);
1950 /* Check quickly whether the next fixup happens to be a matching low. */
1951 if (l->fixp->fx_next != NULL
1952 && FX_OPINFO_R_TYPE (l->fixp->fx_next) == BFD_RELOC_LO16
1953 && l->fixp->fx_addsy == l->fixp->fx_next->fx_addsy
1954 && l->fixp->fx_offset == l->fixp->fx_next->fx_offset)
1957 /* Look through the fixups for this segment for a matching
1958 `low'. When we find one, move the high just in front of it.
1959 We do this in two passes. In the first pass, we try to find
1960 a unique `low'. In the second pass, we permit multiple
1961 high's relocs for a single `low'. */
1962 seginfo = seg_info (l->seg);
1963 for (pass = 0; pass < 2; pass++)
1969 for (f = seginfo->fix_root; f != NULL; f = f->fx_next)
1971 /* Check whether this is a `low' fixup which matches l->fixp. */
1972 if (FX_OPINFO_R_TYPE (f) == BFD_RELOC_LO16
1973 && f->fx_addsy == l->fixp->fx_addsy
1974 && f->fx_offset == l->fixp->fx_offset
1977 || (FX_OPINFO_R_TYPE (prev) != BFD_RELOC_HI16)
1978 || prev->fx_addsy != f->fx_addsy
1979 || prev->fx_offset != f->fx_offset))
1983 /* Move l->fixp before f. */
1984 for (pf = &seginfo->fix_root;
1986 pf = & (* pf)->fx_next)
1987 gas_assert (* pf != NULL);
1989 * pf = l->fixp->fx_next;
1991 l->fixp->fx_next = f;
1993 seginfo->fix_root = l->fixp;
1995 prev->fx_next = l->fixp;
2007 as_warn_where (l->fixp->fx_file, l->fixp->fx_line,
2008 _("Unmatched high relocation"));
2013 /* See whether we need to force a relocation into the output file. */
2016 mep_force_relocation (fixS *fixp)
2018 if ( fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT
2019 || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
2022 if (generic_force_reloc (fixp))
2025 /* Allow branches to global symbols to be resolved at assembly time.
2026 This is consistent with way relaxable branches are handled, since
2027 branches to both global and local symbols are relaxed. It also
2028 corresponds to the assumptions made in md_pcrel_from_section. */
2029 return S_FORCE_RELOC (fixp->fx_addsy, !fixp->fx_pcrel);
2032 /* Write a value out to the object file, using the appropriate endianness. */
2035 md_number_to_chars (char *buf, valueT val, int n)
2037 if (target_big_endian)
2038 number_to_chars_bigendian (buf, val, n);
2040 number_to_chars_littleendian (buf, val, n);
2044 md_atof (int type, char *litP, int *sizeP)
2046 return ieee_md_atof (type, litP, sizeP, TRUE);
2050 mep_fix_adjustable (fixS *fixP)
2052 bfd_reloc_code_real_type reloc_type;
2054 if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED)
2056 const CGEN_INSN *insn = NULL;
2057 int opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED;
2058 const CGEN_OPERAND *operand
2059 = cgen_operand_lookup_by_num(gas_cgen_cpu_desc, opindex);
2060 reloc_type = md_cgen_lookup_reloc (insn, operand, fixP);
2063 reloc_type = fixP->fx_r_type;
2065 if (fixP->fx_addsy == NULL)
2068 /* Prevent all adjustments to global symbols. */
2069 if (S_IS_EXTERNAL (fixP->fx_addsy))
2072 if (S_IS_WEAK (fixP->fx_addsy))
2075 /* We need the symbol name for the VTABLE entries */
2076 if (reloc_type == BFD_RELOC_VTABLE_INHERIT
2077 || reloc_type == BFD_RELOC_VTABLE_ENTRY)
2084 mep_elf_section_letter (int letter, const char **ptrmsg)
2087 return SHF_MEP_VLIW;
2089 *ptrmsg = _("bad .section directive: want a,v,w,x,M,S in string");
2094 mep_elf_section_flags (flagword flags, bfd_vma attr, int type ATTRIBUTE_UNUSED)
2096 if (attr & SHF_MEP_VLIW)
2097 flags |= SEC_MEP_VLIW;
2101 /* In vliw mode, the default section is .vtext. We have to be able
2102 to switch into .vtext using only the .vtext directive. */
2105 mep_vtext_section (void)
2107 static segT vtext_section;
2109 if (! vtext_section)
2111 flagword applicable = bfd_applicable_section_flags (stdoutput);
2112 vtext_section = subseg_new (VTEXT_SECTION_NAME, 0);
2113 bfd_set_section_flags (stdoutput, vtext_section,
2114 applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
2115 | SEC_CODE | SEC_READONLY
2119 return vtext_section;
2123 mep_s_vtext (int ignore ATTRIBUTE_UNUSED)
2127 /* Record previous_section and previous_subsection. */
2128 obj_elf_section_change_hook ();
2130 temp = get_absolute_expression ();
2131 subseg_set (mep_vtext_section (), (subsegT) temp);
2132 demand_empty_rest_of_line ();
2136 mep_switch_to_core_mode (int dummy ATTRIBUTE_UNUSED)
2138 mep_process_saved_insns ();
2144 mep_switch_to_vliw_mode (int dummy ATTRIBUTE_UNUSED)
2147 as_bad (_(".vliw unavailable when VLIW is disabled."));
2149 /* Switch into .vtext here too. */
2150 /* mep_s_vtext(); */
2153 /* This is an undocumented pseudo-op used to disable gas's
2154 "disabled_registers" check. Used for code which checks for those
2155 registers at runtime. */
2157 mep_noregerr (int i ATTRIBUTE_UNUSED)
2159 allow_disabled_registers = 1;
2162 /* mep_unrecognized_line: This is called when a line that can't be parsed
2163 is encountered. We use it to check for a leading '+' sign which indicates
2164 that the current instruction is a coprocessor instruction that is to be
2165 parallelized with a previous core insn. This function accepts the '+' and
2166 rejects all other characters that might indicate garbage at the beginning
2167 of the line. The '+' character gets lost as the calling loop continues,
2168 so we need to indicate that we saw it. */
2171 mep_unrecognized_line (int ch)
2177 return 1; /* '+' indicates an instruction to be parallelized. */
2179 return 0; /* If it's not a '+', the line can't be parsed. */
2186 /* Take care of any insns left to be parallelized when the file ends.
2187 This is mainly here to handle the case where the file ends with an
2188 insn preceded by a + or the file ends unexpectedly. */
2190 mep_process_saved_insns ();
2194 mep_flush_pending_output (void)
2198 mep_process_saved_insns ();