1 /* tc-mep.c -- Assembler for the Toshiba Media Processor.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2009, 2012
3 Free Software Foundation. Inc.
5 This file is part of GAS, the GNU Assembler.
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)
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.
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
19 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
24 #include "dwarf2dbg.h"
27 #include "opcodes/mep-desc.h"
28 #include "opcodes/mep-opc.h"
30 #include "elf/common.h"
35 /* Structure to hold all of the different components describing
36 an individual instruction. */
39 const CGEN_INSN * insn;
40 const CGEN_INSN * orig_insn;
43 CGEN_INSN_INT buffer [1];
44 #define INSN_VALUE(buf) (*(buf))
46 unsigned char buffer [CGEN_MAX_INSN_SIZE];
47 #define INSN_VALUE(buf) (buf)
52 fixS * fixups [GAS_CGEN_MAX_FIXUPS];
53 int indices [MAX_OPERAND_INSTANCES];
56 static int mode = CORE; /* Start in core mode. */
57 static int pluspresent = 0;
58 static int allow_disabled_registers = 0;
59 static int library_flag = 0;
60 static int mep_cop = EF_MEP_COP_NONE;
62 /* We're going to need to store all of the instructions along with
63 their fixups so that we can parallelization grouping rules. */
65 static mep_insn saved_insns[MAX_SAVED_FIXUP_CHAINS];
66 static int num_insns_saved = 0;
68 const char comment_chars[] = "#";
69 const char line_comment_chars[] = ";#";
70 const char line_separator_chars[] = ";";
71 const char EXP_CHARS[] = "eE";
72 const char FLT_CHARS[] = "dD";
74 static void mep_switch_to_vliw_mode (int);
75 static void mep_switch_to_core_mode (int);
76 static void mep_s_vtext (int);
77 static void mep_noregerr (int);
79 /* The target specific pseudo-ops which we support. */
80 const pseudo_typeS md_pseudo_table[] =
83 { "vliw", mep_switch_to_vliw_mode, 0 },
84 { "core", mep_switch_to_core_mode, 0 },
85 { "vtext", mep_s_vtext, 0 },
86 { "noregerr", mep_noregerr, 0 },
90 /* Relocations against symbols are done in two
91 parts, with a HI relocation and a LO relocation. Each relocation
92 has only 16 bits of space to store an addend. This means that in
93 order for the linker to handle carries correctly, it must be able
94 to locate both the HI and the LO relocation. This means that the
95 relocations must appear in order in the relocation table.
97 In order to implement this, we keep track of each unmatched HI
98 relocation. We then sort them so that they immediately precede the
99 corresponding LO relocation. */
103 struct mep_hi_fixup * next; /* Next HI fixup. */
104 fixS * fixp; /* This fixup. */
105 segT seg; /* The section this fixup is in. */
108 /* The list of unmatched HI relocs. */
109 static struct mep_hi_fixup * mep_hi_fixup_list;
112 #define OPTION_EB (OPTION_MD_BASE + 0)
113 #define OPTION_EL (OPTION_MD_BASE + 1)
114 #define OPTION_CONFIG (OPTION_MD_BASE + 2)
115 #define OPTION_AVERAGE (OPTION_MD_BASE + 3)
116 #define OPTION_NOAVERAGE (OPTION_MD_BASE + 4)
117 #define OPTION_MULT (OPTION_MD_BASE + 5)
118 #define OPTION_NOMULT (OPTION_MD_BASE + 6)
119 #define OPTION_DIV (OPTION_MD_BASE + 7)
120 #define OPTION_NODIV (OPTION_MD_BASE + 8)
121 #define OPTION_BITOPS (OPTION_MD_BASE + 9)
122 #define OPTION_NOBITOPS (OPTION_MD_BASE + 10)
123 #define OPTION_LEADZ (OPTION_MD_BASE + 11)
124 #define OPTION_NOLEADZ (OPTION_MD_BASE + 12)
125 #define OPTION_ABSDIFF (OPTION_MD_BASE + 13)
126 #define OPTION_NOABSDIFF (OPTION_MD_BASE + 14)
127 #define OPTION_MINMAX (OPTION_MD_BASE + 15)
128 #define OPTION_NOMINMAX (OPTION_MD_BASE + 16)
129 #define OPTION_CLIP (OPTION_MD_BASE + 17)
130 #define OPTION_NOCLIP (OPTION_MD_BASE + 18)
131 #define OPTION_SATUR (OPTION_MD_BASE + 19)
132 #define OPTION_NOSATUR (OPTION_MD_BASE + 20)
133 #define OPTION_COP32 (OPTION_MD_BASE + 21)
134 #define OPTION_REPEAT (OPTION_MD_BASE + 25)
135 #define OPTION_NOREPEAT (OPTION_MD_BASE + 26)
136 #define OPTION_DEBUG (OPTION_MD_BASE + 27)
137 #define OPTION_NODEBUG (OPTION_MD_BASE + 28)
138 #define OPTION_UCI (OPTION_MD_BASE + 29)
139 #define OPTION_NOUCI (OPTION_MD_BASE + 30)
140 #define OPTION_DSP (OPTION_MD_BASE + 31)
141 #define OPTION_NODSP (OPTION_MD_BASE + 32)
142 #define OPTION_LIBRARY (OPTION_MD_BASE + 33)
144 struct option md_longopts[] = {
145 { "EB", no_argument, NULL, OPTION_EB},
146 { "EL", no_argument, NULL, OPTION_EL},
147 { "mconfig", required_argument, NULL, OPTION_CONFIG},
148 { "maverage", no_argument, NULL, OPTION_AVERAGE},
149 { "mno-average", no_argument, NULL, OPTION_NOAVERAGE},
150 { "mmult", no_argument, NULL, OPTION_MULT},
151 { "mno-mult", no_argument, NULL, OPTION_NOMULT},
152 { "mdiv", no_argument, NULL, OPTION_DIV},
153 { "mno-div", no_argument, NULL, OPTION_NODIV},
154 { "mbitops", no_argument, NULL, OPTION_BITOPS},
155 { "mno-bitops", no_argument, NULL, OPTION_NOBITOPS},
156 { "mleadz", no_argument, NULL, OPTION_LEADZ},
157 { "mno-leadz", no_argument, NULL, OPTION_NOLEADZ},
158 { "mabsdiff", no_argument, NULL, OPTION_ABSDIFF},
159 { "mno-absdiff", no_argument, NULL, OPTION_NOABSDIFF},
160 { "mminmax", no_argument, NULL, OPTION_MINMAX},
161 { "mno-minmax", no_argument, NULL, OPTION_NOMINMAX},
162 { "mclip", no_argument, NULL, OPTION_CLIP},
163 { "mno-clip", no_argument, NULL, OPTION_NOCLIP},
164 { "msatur", no_argument, NULL, OPTION_SATUR},
165 { "mno-satur", no_argument, NULL, OPTION_NOSATUR},
166 { "mcop32", no_argument, NULL, OPTION_COP32},
167 { "mdebug", no_argument, NULL, OPTION_DEBUG},
168 { "mno-debug", no_argument, NULL, OPTION_NODEBUG},
169 { "muci", no_argument, NULL, OPTION_UCI},
170 { "mno-uci", no_argument, NULL, OPTION_NOUCI},
171 { "mdsp", no_argument, NULL, OPTION_DSP},
172 { "mno-dsp", no_argument, NULL, OPTION_NODSP},
173 { "mlibrary", no_argument, NULL, OPTION_LIBRARY},
174 { NULL, 0, NULL, 0 } };
175 size_t md_longopts_size = sizeof (md_longopts);
177 /* Options which default to on/off together. See the comment where
178 this is used for details. Note that CP and CP64 are not in this
179 list because disabling those overrides the -mivc2 option. */
180 #define OPTION_MASK \
181 ( (1 << CGEN_INSN_OPTIONAL_BIT_INSN) \
182 | (1 << CGEN_INSN_OPTIONAL_MUL_INSN) \
183 | (1 << CGEN_INSN_OPTIONAL_DIV_INSN) \
184 | (1 << CGEN_INSN_OPTIONAL_DEBUG_INSN) \
185 | (1 << CGEN_INSN_OPTIONAL_LDZ_INSN) \
186 | (1 << CGEN_INSN_OPTIONAL_ABS_INSN) \
187 | (1 << CGEN_INSN_OPTIONAL_AVE_INSN) \
188 | (1 << CGEN_INSN_OPTIONAL_MINMAX_INSN) \
189 | (1 << CGEN_INSN_OPTIONAL_CLIP_INSN) \
190 | (1 << CGEN_INSN_OPTIONAL_SAT_INSN) \
191 | (1 << CGEN_INSN_OPTIONAL_UCI_INSN) \
192 | (1 << CGEN_INSN_OPTIONAL_DSP_INSN) )
194 const char * md_shortopts = "";
195 static int optbits = 0;
196 static int optbitset = 0;
199 md_parse_option (int c, char *arg ATTRIBUTE_UNUSED)
205 target_big_endian = 1;
208 target_big_endian = 0;
212 for (i=1; mep_config_map[i].name; i++)
213 if (strcmp (mep_config_map[i].name, arg) == 0)
220 fprintf (stderr, "Error: unknown configuration %s\n", arg);
223 mep_config_index = idx;
224 target_big_endian = mep_config_map[idx].big_endian;
227 optbits |= 1 << CGEN_INSN_OPTIONAL_AVE_INSN;
228 optbitset |= 1 << CGEN_INSN_OPTIONAL_AVE_INSN;
230 case OPTION_NOAVERAGE:
231 optbits &= ~(1 << CGEN_INSN_OPTIONAL_AVE_INSN);
232 optbitset |= 1 << CGEN_INSN_OPTIONAL_AVE_INSN;
235 optbits |= 1 << CGEN_INSN_OPTIONAL_MUL_INSN;
236 optbitset |= 1 << CGEN_INSN_OPTIONAL_MUL_INSN;
239 optbits &= ~(1 << CGEN_INSN_OPTIONAL_MUL_INSN);
240 optbitset |= 1 << CGEN_INSN_OPTIONAL_MUL_INSN;
243 optbits |= 1 << CGEN_INSN_OPTIONAL_DIV_INSN;
244 optbitset |= 1 << CGEN_INSN_OPTIONAL_DIV_INSN;
247 optbits &= ~(1 << CGEN_INSN_OPTIONAL_DIV_INSN);
248 optbitset |= 1 << CGEN_INSN_OPTIONAL_DIV_INSN;
251 optbits |= 1 << CGEN_INSN_OPTIONAL_BIT_INSN;
252 optbitset |= 1 << CGEN_INSN_OPTIONAL_BIT_INSN;
254 case OPTION_NOBITOPS:
255 optbits &= ~(1 << CGEN_INSN_OPTIONAL_BIT_INSN);
256 optbitset |= 1 << CGEN_INSN_OPTIONAL_BIT_INSN;
259 optbits |= 1 << CGEN_INSN_OPTIONAL_LDZ_INSN;
260 optbitset |= 1 << CGEN_INSN_OPTIONAL_LDZ_INSN;
263 optbits &= ~(1 << CGEN_INSN_OPTIONAL_LDZ_INSN);
264 optbitset |= 1 << CGEN_INSN_OPTIONAL_LDZ_INSN;
267 optbits |= 1 << CGEN_INSN_OPTIONAL_ABS_INSN;
268 optbitset |= 1 << CGEN_INSN_OPTIONAL_ABS_INSN;
270 case OPTION_NOABSDIFF:
271 optbits &= ~(1 << CGEN_INSN_OPTIONAL_ABS_INSN);
272 optbitset |= 1 << CGEN_INSN_OPTIONAL_ABS_INSN;
275 optbits |= 1 << CGEN_INSN_OPTIONAL_MINMAX_INSN;
276 optbitset |= 1 << CGEN_INSN_OPTIONAL_MINMAX_INSN;
278 case OPTION_NOMINMAX:
279 optbits &= ~(1 << CGEN_INSN_OPTIONAL_MINMAX_INSN);
280 optbitset |= 1 << CGEN_INSN_OPTIONAL_MINMAX_INSN;
283 optbits |= 1 << CGEN_INSN_OPTIONAL_CLIP_INSN;
284 optbitset |= 1 << CGEN_INSN_OPTIONAL_CLIP_INSN;
287 optbits &= ~(1 << CGEN_INSN_OPTIONAL_CLIP_INSN);
288 optbitset |= 1 << CGEN_INSN_OPTIONAL_CLIP_INSN;
291 optbits |= 1 << CGEN_INSN_OPTIONAL_SAT_INSN;
292 optbitset |= 1 << CGEN_INSN_OPTIONAL_SAT_INSN;
295 optbits &= ~(1 << CGEN_INSN_OPTIONAL_SAT_INSN);
296 optbitset |= 1 << CGEN_INSN_OPTIONAL_SAT_INSN;
299 optbits |= 1 << CGEN_INSN_OPTIONAL_CP_INSN;
300 optbitset |= 1 << CGEN_INSN_OPTIONAL_CP_INSN;
303 optbits |= 1 << CGEN_INSN_OPTIONAL_DEBUG_INSN;
304 optbitset |= 1 << CGEN_INSN_OPTIONAL_DEBUG_INSN;
307 optbits &= ~(1 << CGEN_INSN_OPTIONAL_DEBUG_INSN);
308 optbitset |= 1 << CGEN_INSN_OPTIONAL_DEBUG_INSN;
311 optbits |= 1 << CGEN_INSN_OPTIONAL_UCI_INSN;
312 optbitset |= 1 << CGEN_INSN_OPTIONAL_UCI_INSN;
315 optbits &= ~(1 << CGEN_INSN_OPTIONAL_UCI_INSN);
316 optbitset |= 1 << CGEN_INSN_OPTIONAL_UCI_INSN;
319 optbits |= 1 << CGEN_INSN_OPTIONAL_DSP_INSN;
320 optbitset |= 1 << CGEN_INSN_OPTIONAL_DSP_INSN;
323 optbits &= ~(1 << CGEN_INSN_OPTIONAL_DSP_INSN);
324 optbitset |= 1 << CGEN_INSN_OPTIONAL_DSP_INSN;
327 library_flag = EF_MEP_LIBRARY;
330 case OPTION_NOREPEAT:
339 md_show_usage (FILE *stream)
341 fprintf (stream, _("MeP specific command line options:\n\
342 -EB assemble for a big endian system\n\
343 -EL assemble for a little endian system (default)\n\
344 -mconfig=<name> specify a chip configuration to use\n\
345 -maverage -mno-average -mmult -mno-mult -mdiv -mno-div\n\
346 -mbitops -mno-bitops -mleadz -mno-leadz -mabsdiff -mno-absdiff\n\
347 -mminmax -mno-minmax -mclip -mno-clip -msatur -mno-satur -mcop32\n\
348 enable/disable the given opcodes\n\
350 If -mconfig is given, the other -m options modify it. Otherwise,\n\
351 if no -m options are given, all core opcodes are enabled;\n\
352 if any enabling -m options are given, only those are enabled;\n\
353 if only disabling -m options are given, only those are disabled.\n\
355 if (mep_config_map[1].name)
358 fprintf (stream, " -mconfig=STR specify the configuration to use\n");
359 fprintf (stream, " Configurations:");
360 for (i=0; mep_config_map[i].name; i++)
361 fprintf (stream, " %s", mep_config_map[i].name);
362 fprintf (stream, "\n");
369 mep_check_for_disabled_registers (mep_insn *insn)
371 static int initted = 0;
372 static int has_mul_div = 0;
373 static int has_cop = 0;
374 static int has_debug = 0;
377 if (allow_disabled_registers)
381 if (target_big_endian)
382 b = insn->buffer[0] * 256 + insn->buffer[1];
384 b = insn->buffer[1] * 256 + insn->buffer[0];
389 if ((b & 0xfffff00e) == 0x7008 /* stc */
390 || (b & 0xfffff00e) == 0x700a /* ldc */)
395 if ((MEP_OMASK & (1 << CGEN_INSN_OPTIONAL_MUL_INSN))
396 || (MEP_OMASK & (1 << CGEN_INSN_OPTIONAL_DIV_INSN)))
398 if (MEP_OMASK & (1 << CGEN_INSN_OPTIONAL_DEBUG_INSN))
400 if (MEP_OMASK & (1 << CGEN_INSN_OPTIONAL_CP_INSN))
404 r = ((b & 0x00f0) >> 4) | ((b & 0x0001) << 4);
410 as_bad (_("$hi and $lo are disabled when MUL and DIV are off"));
417 as_bad (_("$mb0, $me0, $mb1, and $me1 are disabled when COP is off"));
422 as_bad (_("$dbg and $depc are disabled when DEBUG is off"));
431 switch (MEP_CPU & EF_MEP_CPU_MASK)
434 case EF_MEP_CPU_C2: return bfd_mach_mep;
435 case EF_MEP_CPU_C3: return bfd_mach_mep;
436 case EF_MEP_CPU_C4: return bfd_mach_mep;
437 case EF_MEP_CPU_C5: return bfd_mach_mep_c5;
438 case EF_MEP_CPU_H1: return bfd_mach_mep_h1;
444 /* The MeP version of the cgen parse_operand function. The only difference
445 from the standard version is that we want to avoid treating '$foo' and
446 '($foo...)' as references to a symbol called '$foo'. The chances are
447 that '$foo' is really a misspelt register. */
450 mep_parse_operand (CGEN_CPU_DESC cd, enum cgen_parse_operand_type want,
451 const char **strP, int opindex, int opinfo,
452 enum cgen_parse_operand_result *resultP, bfd_vma *valueP)
454 if (want == CGEN_PARSE_OPERAND_INTEGER || want == CGEN_PARSE_OPERAND_ADDRESS)
462 return "Not a valid literal";
464 return gas_cgen_parse_operand (cd, want, strP, opindex, opinfo,
471 /* Initialize the `cgen' interface. */
473 /* If the user specifies no options, we default to allowing
474 everything. If the user specifies any enabling options, we
475 default to allowing only what is specified. If the user
476 specifies only disabling options, we only disable what is
477 specified. If the user specifies options and a config, the
478 options modify the config. */
479 if (optbits && mep_config_index == 0)
481 MEP_OMASK &= ~OPTION_MASK;
482 MEP_OMASK |= optbits;
485 MEP_OMASK = (MEP_OMASK & ~optbitset) | optbits;
487 mep_cop = mep_config_map[mep_config_index].cpu_flag & EF_MEP_COP_MASK;
489 /* Set the machine number and endian. */
490 gas_cgen_cpu_desc = mep_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,
491 CGEN_CPU_OPEN_ENDIAN,
494 : CGEN_ENDIAN_LITTLE,
495 CGEN_CPU_OPEN_ISAS, 0,
497 mep_cgen_init_asm (gas_cgen_cpu_desc);
499 /* This is a callback from cgen to gas to parse operands. */
500 cgen_set_parse_operand_fn (gas_cgen_cpu_desc, mep_parse_operand);
502 /* Identify the architecture. */
503 bfd_default_set_arch_mach (stdoutput, bfd_arch_mep, mep_machine ());
505 /* Store the configuration number and core. */
506 bfd_set_private_flags (stdoutput, MEP_CPU | MEP_CONFIG | library_flag);
508 /* Initialize the array we'll be using to store fixups. */
509 gas_cgen_initialize_saved_fixups_array();
512 /* Variant of mep_cgen_assemble_insn. Assemble insn STR of cpu CD as a
513 coprocessor instruction, if possible, into FIELDS, BUF, and INSN. */
515 static const CGEN_INSN *
516 mep_cgen_assemble_cop_insn (CGEN_CPU_DESC cd,
519 CGEN_INSN_BYTES_PTR buf,
520 const struct cgen_insn *pinsn)
523 CGEN_INSN_LIST *ilist;
524 const char *errmsg = NULL;
526 /* The instructions are stored in hashed lists. */
527 ilist = CGEN_ASM_LOOKUP_INSN (gas_cgen_cpu_desc,
528 CGEN_INSN_MNEMONIC (pinsn));
531 for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
533 const CGEN_INSN *insn = ilist->insn;
534 if (strcmp (CGEN_INSN_MNEMONIC (ilist->insn),
535 CGEN_INSN_MNEMONIC (pinsn)) == 0
536 && MEP_INSN_COP_P (ilist->insn)
537 && mep_cgen_insn_supported (cd, insn))
541 /* skip this insn if str doesn't look right lexically */
542 if (CGEN_INSN_RX (insn) != NULL &&
543 regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
546 /* Allow parse/insert handlers to obtain length of insn. */
547 CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
549 errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
553 errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
565 mep_save_insn (mep_insn insn)
567 /* Consider change MAX_SAVED_FIXUP_CHAINS to MAX_PARALLEL_INSNS. */
568 if (num_insns_saved < 0 || num_insns_saved >= MAX_SAVED_FIXUP_CHAINS)
570 as_fatal("index into saved_insns[] out of bounds.");
573 saved_insns[num_insns_saved] = insn;
574 gas_cgen_save_fixups(num_insns_saved);
579 mep_check_parallel32_scheduling (void)
581 int insn0iscopro, insn1iscopro, insn0length, insn1length;
583 /* More than two instructions means that either someone is referring to
584 an internally parallel core or an internally parallel coprocessor,
585 neither of which are supported at this time. */
586 if ( num_insns_saved > 2 )
587 as_fatal("Internally paralled cores and coprocessors not supported.");
589 /* If there are no insns saved, that's ok. Just return. This will
590 happen when mep_process_saved_insns is called when the end of the
591 source file is reached and there are no insns left to be processed. */
592 if (num_insns_saved == 0)
595 /* Check some of the attributes of the first insn. */
596 insn0iscopro = MEP_INSN_COP_P (saved_insns[0].insn);
597 insn0length = CGEN_FIELDS_BITSIZE (& saved_insns[0].fields);
599 if (num_insns_saved == 2)
601 /* Check some of the attributes of the first insn. */
602 insn1iscopro = MEP_INSN_COP_P (saved_insns[1].insn);
603 insn1length = CGEN_FIELDS_BITSIZE (& saved_insns[1].fields);
605 if ((insn0iscopro && !insn1iscopro)
606 || (insn1iscopro && !insn0iscopro))
608 /* We have one core and one copro insn. If their sizes
609 add up to 32, then the combination is valid. */
610 if (insn0length + insn1length == 32)
613 as_bad (_("core and copro insn lengths must total 32 bits."));
616 as_bad (_("vliw group must consist of 1 core and 1 copro insn."));
620 /* If we arrive here, we have one saved instruction. There are a
621 number of possible cases:
623 1. The instruction is a 32 bit core or coprocessor insn and
624 can be executed by itself. Valid.
626 2. The instrucion is a core instruction for which a cop nop
627 exists. In this case, insert the cop nop into the saved
628 insn array after the core insn and return. Valid.
630 3. The instruction is a coprocessor insn for which a core nop
631 exists. In this case, move the coprocessor insn to the
632 second element of the array and put the nop in the first
633 element then return. Valid.
635 4. The instruction is a core or coprocessor instruction for
636 which there is no matching coprocessor or core nop to use
637 to form a valid vliw insn combination. In this case, we
640 if (insn0length > 32)
641 as_fatal ("Cannot use 48- or 64-bit insns with a 32 bit datapath.");
643 if (insn0length == 32)
646 /* Insn is smaller than datapath. If there are no matching
647 nops for this insn, then terminate assembly. */
648 if (CGEN_INSN_ATTR_VALUE (saved_insns[0].insn,
649 CGEN_INSN_VLIW32_NO_MATCHING_NOP))
650 as_fatal ("No valid nop.");
652 /* At this point we know that we have a single 16-bit insn that has
653 a matching nop. We have to assemble it and put it into the saved
654 insn and fixup chain arrays. */
661 /* Move the insn and it's fixups to the second element of the
662 saved insns arrary and insert a 16 bit core nope into the
664 insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "nop",
665 &insn.fields, insn.buffer,
669 as_bad ("%s", errmsg);
673 /* Move the insn in element 0 to element 1 and insert the
674 nop into element 0. Move the fixups in element 0 to
675 element 1 and save the current fixups to element 0.
676 Really there aren't any fixups at this point because we're
677 inserting a nop but we might as well be general so that
678 if there's ever a need to insert a general insn, we'll
680 saved_insns[1] = saved_insns[0];
681 saved_insns[0] = insn;
683 gas_cgen_swap_fixups (0);
684 gas_cgen_save_fixups (1);
690 int insn_num = saved_insns[0].insn->base->num;
692 /* Use 32 bit branches and skip the nop. */
693 if (insn_num == MEP_INSN_BSR12
694 || insn_num == MEP_INSN_BEQZ
695 || insn_num == MEP_INSN_BNEZ)
698 /* Insert a 16-bit coprocessor nop. Note that at the time */
699 /* this was done, no 16-bit coprocessor nop was defined. */
700 insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "cpnop16",
701 &insn.fields, insn.buffer,
705 as_bad ("%s", errmsg);
709 /* Now put the insn and fixups into the arrays. */
710 mep_save_insn (insn);
716 mep_check_parallel64_scheduling (void)
718 int insn0iscopro, insn1iscopro, insn0length, insn1length;
720 /* More than two instructions means that someone is referring to an
721 internally parallel core or an internally parallel coprocessor. */
722 /* These are not currently supported. */
723 if (num_insns_saved > 2)
724 as_fatal ("Internally parallel cores of coprocessors not supported.");
726 /* If there are no insns saved, that's ok. Just return. This will
727 happen when mep_process_saved_insns is called when the end of the
728 source file is reached and there are no insns left to be processed. */
729 if (num_insns_saved == 0)
732 /* Check some of the attributes of the first insn. */
733 insn0iscopro = MEP_INSN_COP_P (saved_insns[0].insn);
734 insn0length = CGEN_FIELDS_BITSIZE (& saved_insns[0].fields);
736 if (num_insns_saved == 2)
738 /* Check some of the attributes of the first insn. */
739 insn1iscopro = MEP_INSN_COP_P (saved_insns[1].insn);
740 insn1length = CGEN_FIELDS_BITSIZE (& saved_insns[1].fields);
742 if ((insn0iscopro && !insn1iscopro)
743 || (insn1iscopro && !insn0iscopro))
745 /* We have one core and one copro insn. If their sizes
746 add up to 64, then the combination is valid. */
747 if (insn0length + insn1length == 64)
750 as_bad (_("core and copro insn lengths must total 64 bits."));
753 as_bad (_("vliw group must consist of 1 core and 1 copro insn."));
757 /* If we arrive here, we have one saved instruction. There are a
758 number of possible cases:
760 1. The instruction is a 64 bit coprocessor insn and can be
761 executed by itself. Valid.
763 2. The instrucion is a core instruction for which a cop nop
764 exists. In this case, insert the cop nop into the saved
765 insn array after the core insn and return. Valid.
767 3. The instruction is a coprocessor insn for which a core nop
768 exists. In this case, move the coprocessor insn to the
769 second element of the array and put the nop in the first
770 element then return. Valid.
772 4. The instruction is a core or coprocessor instruction for
773 which there is no matching coprocessor or core nop to use
774 to form a valid vliw insn combination. In this case, we
777 /* If the insn is 64 bits long, it can run alone. The size check
778 is done indepependantly of whether the insn is core or copro
779 in case 64 bit coprocessor insns are added later. */
780 if (insn0length == 64)
783 /* Insn is smaller than datapath. If there are no matching
784 nops for this insn, then terminate assembly. */
785 if (CGEN_INSN_ATTR_VALUE (saved_insns[0].insn,
786 CGEN_INSN_VLIW64_NO_MATCHING_NOP))
787 as_fatal ("No valid nop.");
794 /* Initialize the insn buffer. */
795 memset (insn.buffer, 0, sizeof(insn.buffer));
797 /* We have a coprocessor insn. At this point in time there
798 are is 32-bit core nop. There is only a 16-bit core
799 nop. The idea is to allow for a relatively arbitrary
800 coprocessor to be specified. We aren't looking at
801 trying to cover future changes in the core at this time
802 since it is assumed that the core will remain fairly
803 static. If there ever are 32 or 48 bit core nops added,
804 they will require entries below. */
806 if (insn0length == 48)
808 /* Move the insn and fixups to the second element of the
809 arrays then assemble and insert a 16 bit core nop. */
810 insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "nop",
811 & insn.fields, insn.buffer,
816 /* If this is reached, then we have a single coprocessor
817 insn that is not 48 bits long, but for which the assembler
818 thinks there is a matching core nop. If a 32-bit core
819 nop has been added, then make the necessary changes and
820 handle its assembly and insertion here. Otherwise,
821 go figure out why either:
823 1. The assembler thinks that there is a 32-bit core nop
824 to match a 32-bit coprocessor insn, or
825 2. The assembler thinks that there is a 48-bit core nop
826 to match a 16-bit coprocessor insn. */
828 as_fatal ("Assembler expects a non-existent core nop.");
833 as_bad ("%s", errmsg);
837 /* Move the insn in element 0 to element 1 and insert the
838 nop into element 0. Move the fixups in element 0 to
839 element 1 and save the current fixups to element 0.
840 Really there aren't any fixups at this point because we're
841 inserting a nop but we might as well be general so that
842 if there's ever a need to insert a general insn, we'll
845 saved_insns[1] = saved_insns[0];
846 saved_insns[0] = insn;
848 gas_cgen_swap_fixups(0);
849 gas_cgen_save_fixups(1);
857 /* Initialize the insn buffer */
858 memset (insn.buffer, 0, sizeof(insn.buffer));
860 /* We have a core insn. We have to handle all possible nop
861 lengths. If a coprocessor doesn't have a nop of a certain
862 length but there exists core insns that when combined with
863 a nop of that length would fill the datapath, those core
864 insns will be flagged with the VLIW_NO_CORRESPONDING_NOP
865 attribute. That will ensure that when used in a way that
866 requires a nop to be inserted, assembly will terminate
867 before reaching this section of code. This guarantees
868 that cases below which would result in the attempted
869 insertion of nop that doesn't exist will never be entered. */
870 if (insn0length == 16)
872 /* Insert 48 bit coprocessor nop. */
873 /* Assemble it and put it into the arrays. */
874 insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "cpnop48",
875 &insn.fields, insn.buffer,
878 else if (insn0length == 32)
880 /* Insert 32 bit coprocessor nop. */
881 insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "cpnop32",
882 &insn.fields, insn.buffer,
885 else if (insn0length == 48)
887 /* Insert 16 bit coprocessor nop. */
888 insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, "cpnop16",
889 &insn.fields, insn.buffer,
893 /* Core insn has an invalid length. Something has gone wrong. */
894 as_fatal ("Core insn has invalid length! Something is wrong!");
898 as_bad ("%s", errmsg);
902 /* Now put the insn and fixups into the arrays. */
903 mep_save_insn (insn);
908 #ifdef MEP_IVC2_SUPPORTED
910 /* IVC2 packing is different than other VLIW coprocessors. Many of
911 the COP insns can be placed in any of three different types of
912 slots, and each bundle can hold up to three insns - zero or one
913 core insns and one or two IVC2 insns. The insns in CGEN are tagged
914 with which slots they're allowed in, and we have to decide based on
915 that whether or not the user had given us a possible bundling. */
918 slot_ok (int idx, int slot)
920 const CGEN_INSN *insn = saved_insns[idx].insn;
921 return CGEN_ATTR_CGEN_INSN_SLOTS_VALUE (CGEN_INSN_ATTRS (insn)) & (1 << slot);
925 mep_check_ivc2_scheduling (void)
929 V1 [-----core-----][--------p0s-------][------------p1------------]
930 V2 [-------------core-------------]xxxx[------------p1------------]
931 V3 1111[--p0--]0111[--------p0--------][------------p1------------]
934 int slots[5]; /* Indexed off the SLOTS_ATTR enum. */
935 int corelength, realcorelength;
939 int e = target_big_endian ? 0 : 1;
941 /* If there are no insns saved, that's ok. Just return. This will
942 happen when mep_process_saved_insns is called when the end of the
943 source file is reached and there are no insns left to be processed. */
944 if (num_insns_saved == 0)
950 if (slot_ok (0, SLOTS_CORE))
952 slots[SLOTS_CORE] = 0;
953 realcorelength = corelength = CGEN_FIELDS_BITSIZE (& saved_insns[0].fields);
955 /* If we encounter one of these, it may get relaxed later into a
956 longer instruction. We can't just push the other opcodes
957 away, the bigger insn has to fit into the existing slot. So,
958 we make room for the relaxed instruction here. */
960 if (saved_insns[0].insn->base->num == MEP_INSN_BSR12
961 || saved_insns[0].insn->base->num == MEP_INSN_BRA)
965 realcorelength = corelength = 0;
967 if (corelength == 16)
969 /* V1 mode: we need a P0S slot and a P1 slot. */
970 switch (num_insns_saved)
973 /* No other insns, fill with NOPs. */
977 if (slot_ok (1, SLOTS_P1))
979 else if (slot_ok (1, SLOTS_P0S))
980 slots[SLOTS_P0S] = 1;
982 as_bad (_("cannot pack %s with a 16-bit insn"),
983 CGEN_INSN_NAME (saved_insns[1].insn));
987 if (slot_ok (1, SLOTS_P0S)
988 && slot_ok (2, SLOTS_P1))
990 slots[SLOTS_P0S] = 1;
993 else if (slot_ok (1, SLOTS_P1)
994 && slot_ok (2, SLOTS_P0S))
997 slots[SLOTS_P0S] = 2;
1000 as_bad (_("cannot pack %s and %s together with a 16-bit insn"),
1001 CGEN_INSN_NAME (saved_insns[1].insn),
1002 CGEN_INSN_NAME (saved_insns[2].insn));
1006 as_bad (_("too many IVC2 insns to pack with a 16-bit core insn"));
1010 else if (corelength == 32)
1012 /* V2 mode: we need a P1 slot. */
1013 switch (num_insns_saved)
1016 /* No other insns, fill with NOPs. */
1019 /* The other insn must allow P1. */
1020 if (!slot_ok (1, SLOTS_P1))
1021 as_bad (_("cannot pack %s into slot P1"),
1022 CGEN_INSN_NAME (saved_insns[1].insn));
1024 slots[SLOTS_P1] = 1;
1027 as_bad (_("too many IVC2 insns to pack with a 32-bit core insn"));
1031 else if (corelength == 0)
1033 /* V3 mode: we need a P0 slot and a P1 slot, or a P0S+P1 with a
1035 switch (num_insns_saved)
1038 if (slot_ok (0, SLOTS_P0))
1039 slots[SLOTS_P0] = 0;
1040 else if (slot_ok (0, SLOTS_P1))
1041 slots[SLOTS_P1] = 0;
1042 else if (slot_ok (0, SLOTS_P0S))
1043 slots[SLOTS_P0S] = 0;
1045 as_bad (_("unable to pack %s by itself?"),
1046 CGEN_INSN_NAME (saved_insns[0].insn));
1050 if (slot_ok (0, SLOTS_P0)
1051 && slot_ok (1, SLOTS_P1))
1053 slots[SLOTS_P0] = 0;
1054 slots[SLOTS_P1] = 1;
1056 else if (slot_ok (0, SLOTS_P1)
1057 && slot_ok (1, SLOTS_P0))
1059 slots[SLOTS_P1] = 0;
1060 slots[SLOTS_P0] = 1;
1062 else if (slot_ok (0, SLOTS_P0S)
1063 && slot_ok (1, SLOTS_P1))
1065 slots[SLOTS_P0S] = 0;
1066 slots[SLOTS_P1] = 1;
1068 else if (slot_ok (0, SLOTS_P1)
1069 && slot_ok (1, SLOTS_P0S))
1071 slots[SLOTS_P1] = 0;
1072 slots[SLOTS_P0S] = 1;
1075 as_bad (_("cannot pack %s and %s together"),
1076 CGEN_INSN_NAME (saved_insns[0].insn),
1077 CGEN_INSN_NAME (saved_insns[1].insn));
1081 as_bad (_("too many IVC2 insns to pack together"));
1086 /* The core insn needs to be done normally so that fixups,
1087 relaxation, etc are done. Other IVC2 insns need only be resolved
1088 to bit patterns; there are no relocations for them. */
1089 if (slots[SLOTS_CORE] != -1)
1091 gas_cgen_restore_fixups (0);
1092 gas_cgen_finish_insn (saved_insns[0].insn, saved_insns[0].buffer,
1093 CGEN_FIELDS_BITSIZE (& saved_insns[0].fields),
1097 /* Allocate whatever bytes remain in our insn word. Adjust the
1098 pointer to point (as if it were) to the beginning of the whole
1099 word, so that we don't have to adjust for it elsewhere. */
1100 f = (bfd_byte *) frag_more (8 - realcorelength / 8);
1101 /* Unused slots are filled with NOPs, which happen to be all zeros. */
1102 memset (f, 0, 8 - realcorelength / 8);
1103 f -= realcorelength / 8;
1112 m = & saved_insns[slots[i]];
1115 cgen_put_insn_value (gas_cgen_cpu_desc, (unsigned char *) temp, 32,
1118 memcpy (temp, m->buffer, byte_len);
1126 f[4^e] |= temp[3^e] & 0xf0;
1129 f[0^e] = 0xf0 | temp[0^e] >> 4;
1130 f[1^e] = temp[0^e] << 4 | 0x07;
1133 f[4^e] |= temp[3^e] & 0xf0;
1136 f[4^e] |= temp[0^e] >> 4;
1137 f[5^e] = temp[0^e] << 4 | temp[1^e] >> 4;
1138 f[6^e] = temp[1^e] << 4 | temp[2^e] >> 4;
1139 f[7^e] = temp[2^e] << 4 | temp[3^e] >> 4;
1147 #endif /* MEP_IVC2_SUPPORTED */
1149 /* The scheduling functions are just filters for invalid combinations.
1150 If there is a violation, they terminate assembly. Otherise they
1151 just fall through. Succesful combinations cause no side effects
1152 other than valid nop insertion. */
1155 mep_check_parallel_scheduling (void)
1157 /* This is where we will eventually read the config information
1158 and choose which scheduling checking function to call. */
1159 #ifdef MEP_IVC2_SUPPORTED
1160 if (mep_cop == EF_MEP_COP_IVC2)
1161 mep_check_ivc2_scheduling ();
1163 #endif /* MEP_IVC2_SUPPORTED */
1165 mep_check_parallel64_scheduling ();
1167 mep_check_parallel32_scheduling ();
1171 mep_process_saved_insns (void)
1175 gas_cgen_save_fixups (MAX_SAVED_FIXUP_CHAINS - 1);
1177 /* We have to check for valid scheduling here. */
1178 mep_check_parallel_scheduling ();
1180 /* IVC2 has to pack instructions in a funny way, so it does it
1182 if (mep_cop != EF_MEP_COP_IVC2)
1184 /* If the last call didn't cause assembly to terminate, we have
1185 a valid vliw insn/insn pair saved. Restore this instructions'
1186 fixups and process the insns. */
1187 for (i = 0;i<num_insns_saved;i++)
1189 gas_cgen_restore_fixups (i);
1190 gas_cgen_finish_insn (saved_insns[i].insn, saved_insns[i].buffer,
1191 CGEN_FIELDS_BITSIZE (& saved_insns[i].fields),
1195 gas_cgen_restore_fixups (MAX_SAVED_FIXUP_CHAINS - 1);
1197 /* Clear the fixups and reset the number insn saved to 0. */
1198 gas_cgen_initialize_saved_fixups_array ();
1199 num_insns_saved = 0;
1200 listing_prev_line ();
1204 md_assemble (char * str)
1206 static CGEN_BITSET* isas = NULL;
1209 /* Initialize GAS's cgen interface for a new instruction. */
1210 gas_cgen_init_parse ();
1212 /* There are two possible modes: core and vliw. We have to assemble
1213 differently for each.
1215 Core Mode: We assemble normally. All instructions are on a
1216 single line and are made up of one mnemonic and one
1218 VLIW Mode: Vliw combinations are indicated as follows:
1223 We want to handle the general case where more than
1224 one instruction can be preceeded by a +. This will
1225 happen later if we add support for internally parallel
1226 coprocessors. We'll make the parsing nice and general
1227 so that it can handle an arbitrary number of insns
1228 with leading +'s. The actual checking for valid
1229 combinations is done elsewhere. */
1231 /* Initialize the isa to refer to the core. */
1233 isas = cgen_bitset_copy (& MEP_CORE_ISA);
1236 cgen_bitset_clear (isas);
1237 cgen_bitset_union (isas, & MEP_CORE_ISA, isas);
1239 gas_cgen_cpu_desc->isas = isas;
1245 int thisInsnIsCopro = 0;
1249 /* Initialize the insn buffer */
1251 if (! CGEN_INT_INSN_P)
1252 for (i=0; i < CGEN_MAX_INSN_SIZE; i++)
1253 insn.buffer[i]='\0';
1256 /* IVC2 has two sets of coprocessor opcodes, one for CORE mode
1257 and one for VLIW mode. They have the same names. To specify
1258 which one we want, we use the COP isas - the 32 bit ISA is
1259 for the core instructions (which are always 32 bits), and the
1260 other ISAs are for the VLIW ones (which always pack into 64
1261 bit insns). We use other attributes to determine slotting
1263 if (mep_cop == EF_MEP_COP_IVC2)
1265 cgen_bitset_union (isas, & MEP_COP16_ISA, isas);
1266 cgen_bitset_union (isas, & MEP_COP48_ISA, isas);
1267 cgen_bitset_union (isas, & MEP_COP64_ISA, isas);
1271 /* Can't tell core / copro insns apart at parse time! */
1272 cgen_bitset_union (isas, & MEP_COP_ISA, isas);
1275 /* Assemble the insn so we can examine its attributes. */
1276 insn.insn = mep_cgen_assemble_insn (gas_cgen_cpu_desc, str,
1277 &insn.fields, insn.buffer,
1281 as_bad ("%s", errmsg);
1284 mep_check_for_disabled_registers (&insn);
1286 /* Check to see if it's a coprocessor instruction. */
1287 thisInsnIsCopro = MEP_INSN_COP_P (insn.insn);
1289 if (!thisInsnIsCopro)
1291 insn.insn = mep_cgen_assemble_cop_insn (gas_cgen_cpu_desc, str,
1292 &insn.fields, insn.buffer,
1294 thisInsnIsCopro = MEP_INSN_COP_P (insn.insn);
1295 mep_check_for_disabled_registers (&insn);
1300 /* A plus was present. */
1301 /* Check for a + with a core insn and abort if found. */
1302 if (!thisInsnIsCopro)
1304 as_fatal("A core insn cannot be preceeded by a +.\n");
1308 if (num_insns_saved > 0)
1310 /* There are insns in the queue. Add this one. */
1311 mep_save_insn (insn);
1315 /* There are no insns in the queue and a plus is present.
1316 This is a syntax error. Let's not tolerate this.
1317 We can relax this later if necessary. */
1318 as_bad (_("Invalid use of parallelization operator."));
1324 /* No plus was present. */
1325 if (num_insns_saved > 0)
1327 /* There are insns saved and we came across an insn without a
1328 leading +. That's the signal to process the saved insns
1329 before proceeding then treat the current insn as the first
1330 in a new vliw group. */
1331 mep_process_saved_insns ();
1332 num_insns_saved = 0;
1333 /* mep_save_insn (insn); */
1335 mep_save_insn (insn);
1340 /* Core Insn. Add it to the beginning of the queue. */
1341 mep_save_insn (insn);
1342 /* gas_cgen_save_fixups(num_insns_saved); */
1353 /* Only single instructions are assembled in core mode. */
1356 /* See comment in the VLIW clause above about this. */
1357 if (mep_cop & EF_MEP_COP_IVC2)
1358 cgen_bitset_union (isas, & MEP_COP32_ISA, isas);
1360 /* If a leading '+' was present, issue an error.
1361 That's not allowed in core mode. */
1364 as_bad (_("Leading plus sign not allowed in core mode"));
1368 insn.insn = mep_cgen_assemble_insn
1369 (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
1373 as_bad ("%s", errmsg);
1376 gas_cgen_finish_insn (insn.insn, insn.buffer,
1377 CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
1378 mep_check_for_disabled_registers (&insn);
1383 md_section_align (segT segment, valueT size)
1385 int align = bfd_get_section_alignment (stdoutput, segment);
1386 return ((size + (1 << align) - 1) & (-1 << align));
1391 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
1396 /* Interface to relax_segment. */
1399 const relax_typeS md_relax_table[] =
1402 1) most positive reach of this state,
1403 2) most negative reach of this state,
1404 3) how many bytes this mode will have in the variable part of the frag
1405 4) which index into the table to try if we can't fit into this one. */
1406 /* Note that we use "beq" because "jmp" has a peculiarity - it cannot
1407 jump to addresses with any bits 27..24 set. So, we use beq as a
1408 17-bit pc-relative branch to avoid using jmp, just in case. */
1410 /* 0 */ { 0, 0, 0, 0 }, /* unused */
1411 /* 1 */ { 0, 0, 0, 0 }, /* marker for "don't know yet" */
1413 /* 2 */ { 2047, -2048, 0, 3 }, /* bsr12 */
1414 /* 3 */ { 0, 0, 2, 0 }, /* bsr16 */
1416 /* 4 */ { 2047, -2048, 0, 5 }, /* bra */
1417 /* 5 */ { 65535, -65536, 2, 6 }, /* beq $0,$0 */
1418 /* 6 */ { 0, 0, 2, 0 }, /* jmp24 */
1420 /* 7 */ { 65535, -65536, 0, 8 }, /* beqi */
1421 /* 8 */ { 0, 0, 4, 0 }, /* bnei/jmp */
1423 /* 9 */ { 127, -128, 0, 10 }, /* beqz */
1424 /* 10 */ { 65535, -65536, 2, 11 }, /* beqi */
1425 /* 11 */ { 0, 0, 4, 0 }, /* bnei/jmp */
1427 /* 12 */ { 65535, -65536, 0, 13 }, /* bnei */
1428 /* 13 */ { 0, 0, 4, 0 }, /* beqi/jmp */
1430 /* 14 */ { 127, -128, 0, 15 }, /* bnez */
1431 /* 15 */ { 65535, -65536, 2, 16 }, /* bnei */
1432 /* 16 */ { 0, 0, 4, 0 }, /* beqi/jmp */
1434 /* 17 */ { 65535, -65536, 0, 13 }, /* bgei */
1435 /* 18 */ { 0, 0, 4, 0 },
1436 /* 19 */ { 65535, -65536, 0, 13 }, /* blti */
1437 /* 20 */ { 0, 0, 4, 0 },
1438 /* 19 */ { 65535, -65536, 0, 13 }, /* bcpeq */
1439 /* 20 */ { 0, 0, 4, 0 },
1440 /* 19 */ { 65535, -65536, 0, 13 }, /* bcpne */
1441 /* 20 */ { 0, 0, 4, 0 },
1442 /* 19 */ { 65535, -65536, 0, 13 }, /* bcpat */
1443 /* 20 */ { 0, 0, 4, 0 },
1444 /* 19 */ { 65535, -65536, 0, 13 }, /* bcpaf */
1445 /* 20 */ { 0, 0, 4, 0 }
1448 /* Pseudo-values for 64 bit "insns" which are combinations of two 32
1452 MEP_PSEUDO64_16BITCC,
1453 MEP_PSEUDO64_32BITCC,
1454 } MepPseudo64Values;
1459 int insn_for_extern;
1460 } subtype_mappings[] = {
1463 { MEP_INSN_BSR12, 0, MEP_INSN_BSR24 },
1464 { MEP_INSN_BSR24, 2, MEP_INSN_BSR24 },
1465 { MEP_INSN_BRA, 0, MEP_INSN_BRA },
1466 { MEP_INSN_BEQ, 2, MEP_INSN_BEQ },
1467 { MEP_INSN_JMP, 2, MEP_INSN_JMP },
1468 { MEP_INSN_BEQI, 0, MEP_INSN_BEQI },
1469 { -1, 4, MEP_PSEUDO64_32BITCC },
1470 { MEP_INSN_BEQZ, 0, MEP_INSN_BEQZ },
1471 { MEP_INSN_BEQI, 2, MEP_INSN_BEQI },
1472 { -1, 4, MEP_PSEUDO64_16BITCC },
1473 { MEP_INSN_BNEI, 0, MEP_INSN_BNEI },
1474 { -1, 4, MEP_PSEUDO64_32BITCC },
1475 { MEP_INSN_BNEZ, 0, MEP_INSN_BNEZ },
1476 { MEP_INSN_BNEI, 2, MEP_INSN_BNEI },
1477 { -1, 4, MEP_PSEUDO64_16BITCC },
1478 { MEP_INSN_BGEI, 0, MEP_INSN_BGEI },
1479 { -1, 4, MEP_PSEUDO64_32BITCC },
1480 { MEP_INSN_BLTI, 0, MEP_INSN_BLTI },
1481 { -1, 4, MEP_PSEUDO64_32BITCC },
1482 { MEP_INSN_BCPEQ, 0, MEP_INSN_BCPEQ },
1483 { -1, 4, MEP_PSEUDO64_32BITCC },
1484 { MEP_INSN_BCPNE, 0, MEP_INSN_BCPNE },
1485 { -1, 4, MEP_PSEUDO64_32BITCC },
1486 { MEP_INSN_BCPAT, 0, MEP_INSN_BCPAT },
1487 { -1, 4, MEP_PSEUDO64_32BITCC },
1488 { MEP_INSN_BCPAF, 0, MEP_INSN_BCPAF },
1489 { -1, 4, MEP_PSEUDO64_32BITCC }
1491 #define NUM_MAPPINGS (sizeof (subtype_mappings) / sizeof (subtype_mappings[0]))
1494 mep_prepare_relax_scan (fragS *fragP, offsetT *aim, relax_substateT this_state)
1496 symbolS *symbolP = fragP->fr_symbol;
1497 if (symbolP && !S_IS_DEFINED (symbolP))
1499 /* Adjust for MeP pcrel not being relative to the next opcode. */
1500 *aim += 2 + md_relax_table[this_state].rlx_length;
1504 insn_to_subtype (int insn)
1507 for (i=0; i<NUM_MAPPINGS; i++)
1508 if (insn == subtype_mappings[i].insn)
1513 /* Return an initial guess of the length by which a fragment must grow
1514 to hold a branch to reach its destination. Also updates fr_type
1515 and fr_subtype as necessary.
1517 Called just before doing relaxation. Any symbol that is now
1518 undefined will not become defined. The guess for fr_var is
1519 ACTUALLY the growth beyond fr_fix. Whatever we do to grow fr_fix
1520 or fr_var contributes to our returned value. Although it may not
1521 be explicit in the frag, pretend fr_var starts with a 0 value. */
1524 md_estimate_size_before_relax (fragS * fragP, segT segment)
1526 if (fragP->fr_subtype == 1)
1527 fragP->fr_subtype = insn_to_subtype (fragP->fr_cgen.insn->base->num);
1529 if (S_GET_SEGMENT (fragP->fr_symbol) != segment
1530 || S_IS_WEAK (fragP->fr_symbol)
1531 #ifdef MEP_IVC2_SUPPORTED
1532 || (mep_cop == EF_MEP_COP_IVC2
1533 && bfd_get_section_flags (stdoutput, segment) & SEC_MEP_VLIW)
1534 #endif /* MEP_IVC2_SUPPORTED */
1539 new_insn = subtype_mappings[fragP->fr_subtype].insn_for_extern;
1540 fragP->fr_subtype = insn_to_subtype (new_insn);
1543 if (MEP_VLIW && ! MEP_VLIW64
1544 && (bfd_get_section_flags (stdoutput, segment) & SEC_MEP_VLIW))
1546 /* Use 32 bit branches for vliw32 so the vliw word is not split. */
1547 switch (fragP->fr_cgen.insn->base->num)
1549 case MEP_INSN_BSR12:
1550 fragP->fr_subtype = insn_to_subtype
1551 (subtype_mappings[fragP->fr_subtype].insn_for_extern);
1554 fragP->fr_subtype ++;
1557 fragP->fr_subtype ++;
1562 if (fragP->fr_cgen.insn->base
1563 && fragP->fr_cgen.insn->base->num
1564 != subtype_mappings[fragP->fr_subtype].insn)
1566 int new_insn= subtype_mappings[fragP->fr_subtype].insn;
1569 fragP->fr_cgen.insn = (fragP->fr_cgen.insn
1570 - fragP->fr_cgen.insn->base->num
1575 #ifdef MEP_IVC2_SUPPORTED
1576 if (mep_cop == EF_MEP_COP_IVC2
1577 && bfd_get_section_flags (stdoutput, segment) & SEC_MEP_VLIW)
1579 #endif /* MEP_IVC2_SUPPORTED */
1581 return subtype_mappings[fragP->fr_subtype].growth;
1584 /* VLIW does relaxing, but not growth. */
1587 mep_relax_frag (segT segment, fragS *fragP, long stretch)
1589 long rv = relax_frag (segment, fragP, stretch);
1590 #ifdef MEP_IVC2_SUPPORTED
1591 if (mep_cop == EF_MEP_COP_IVC2
1592 && bfd_get_section_flags (stdoutput, segment) & SEC_MEP_VLIW)
1598 /* *fragP has been relaxed to its final size, and now needs to have
1599 the bytes inside it modified to conform to the new size.
1601 Called after relaxation is finished.
1602 fragP->fr_type == rs_machine_dependent.
1603 fragP->fr_subtype is the subtype of what the address relaxed to. */
1606 target_address_for (fragS *frag)
1608 int rv = frag->fr_offset;
1609 symbolS *sym = frag->fr_symbol;
1612 rv += S_GET_VALUE (sym);
1618 md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED,
1619 segT seg ATTRIBUTE_UNUSED,
1622 int addend, rn, bit = 0;
1624 int where = fragP->fr_opcode - fragP->fr_literal;
1625 int e = target_big_endian ? 0 : 1;
1628 #ifdef MEP_IVC2_SUPPORTED
1629 if (bfd_get_section_flags (stdoutput, seg) & SEC_MEP_VLIW
1630 && mep_cop == EF_MEP_COP_IVC2)
1633 #endif /* MEP_IVC2_SUPPORTED */
1636 addend = target_address_for (fragP) - (fragP->fr_address + where);
1638 if (subtype_mappings[fragP->fr_subtype].insn == -1)
1641 fragP->fr_fix += subtype_mappings[fragP->fr_subtype].growth;
1642 switch (subtype_mappings[fragP->fr_subtype].insn_for_extern)
1644 case MEP_PSEUDO64_16BITCC:
1645 fragP->fr_opcode[1^e] = ((fragP->fr_opcode[1^e] & 1) ^ 1) | 0x06;
1646 fragP->fr_opcode[2^e] = 0xd8;
1647 fragP->fr_opcode[3^e] = 0x08;
1648 fragP->fr_opcode[4^e] = 0;
1649 fragP->fr_opcode[5^e] = 0;
1652 case MEP_PSEUDO64_32BITCC:
1653 if (fragP->fr_opcode[0^e] & 0x10)
1654 fragP->fr_opcode[1^e] ^= 0x01;
1656 fragP->fr_opcode[1^e] ^= 0x04;
1657 fragP->fr_opcode[2^e] = 0;
1658 fragP->fr_opcode[3^e] = 4;
1659 fragP->fr_opcode[4^e] = 0xd8;
1660 fragP->fr_opcode[5^e] = 0x08;
1661 fragP->fr_opcode[6^e] = 0;
1662 fragP->fr_opcode[7^e] = 0;
1668 fragP->fr_cgen.insn = (fragP->fr_cgen.insn
1669 - fragP->fr_cgen.insn->base->num
1671 operand = MEP_OPERAND_PCABS24A2;
1674 switch (fragP->fr_cgen.insn->base->num)
1676 case MEP_INSN_BSR12:
1677 fragP->fr_opcode[0^e] = 0xb0 | ((addend >> 8) & 0x0f);
1678 fragP->fr_opcode[1^e] = 0x01 | (addend & 0xfe);
1679 operand = MEP_OPERAND_PCREL12A2;
1682 case MEP_INSN_BSR24:
1685 fragP->fr_opcode[0^e] = 0xd8 | ((addend >> 5) & 0x07);
1686 fragP->fr_opcode[1^e] = 0x09 | ((addend << 3) & 0xf0);
1687 fragP->fr_opcode[2^e] = 0x00 | ((addend >>16) & 0xff);
1688 fragP->fr_opcode[3^e] = 0x00 | ((addend >> 8) & 0xff);
1689 operand = MEP_OPERAND_PCREL24A2;
1693 fragP->fr_opcode[0^e] = 0xb0 | ((addend >> 8) & 0x0f);
1694 fragP->fr_opcode[1^e] = 0x00 | (addend & 0xfe);
1695 operand = MEP_OPERAND_PCREL12A2;
1699 /* The default relax_frag doesn't change the state if there is no
1700 growth, so we must manually handle converting out-of-range BEQ
1701 instructions to JMP. */
1702 if (addend <= 65535 && addend >= -65536)
1706 fragP->fr_opcode[0^e] = 0xe0;
1707 fragP->fr_opcode[1^e] = 0x01;
1708 fragP->fr_opcode[2^e] = 0x00 | ((addend >> 9) & 0xff);
1709 fragP->fr_opcode[3^e] = 0x00 | ((addend >> 1) & 0xff);
1710 operand = MEP_OPERAND_PCREL17A2;
1713 /* ...FALLTHROUGH... */
1716 addend = target_address_for (fragP);
1719 fragP->fr_opcode[0^e] = 0xd8 | ((addend >> 5) & 0x07);
1720 fragP->fr_opcode[1^e] = 0x08 | ((addend << 3) & 0xf0);
1721 fragP->fr_opcode[2^e] = 0x00 | ((addend >>16) & 0xff);
1722 fragP->fr_opcode[3^e] = 0x00 | ((addend >> 8) & 0xff);
1723 operand = MEP_OPERAND_PCABS24A2;
1729 fragP->fr_opcode[1^e] = bit | (addend & 0xfe);
1730 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
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, 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 preceeded by a + or the file ends unexpectedly. */
2190 mep_process_saved_insns ();
2194 mep_flush_pending_output (void)
2198 mep_process_saved_insns ();