1 /* tc-ms1.c -- Assembler for the Morpho Technologies ms-I.
2 Copyright (C) 2005 Free Software Foundation.
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 2, 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, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
23 #include "dwarf2dbg.h"
26 #include "opcodes/ms1-desc.h"
27 #include "opcodes/ms1-opc.h"
29 #include "elf/common.h"
33 /* Structure to hold all of the different components
34 describing 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];
56 const char comment_chars[] = ";";
57 const char line_comment_chars[] = "#";
58 const char line_separator_chars[] = "";
59 const char EXP_CHARS[] = "eE";
60 const char FLT_CHARS[] = "dD";
62 /* The target specific pseudo-ops which we support. */
63 const pseudo_typeS md_pseudo_table[] =
71 static int no_scheduling_restrictions = 0;
73 struct option md_longopts[] =
75 #define OPTION_NO_SCHED_REST (OPTION_MD_BASE)
76 { "nosched", no_argument, NULL, OPTION_NO_SCHED_REST },
77 #define OPTION_MARCH (OPTION_MD_BASE + 1)
78 { "march", required_argument, NULL, OPTION_MARCH},
79 { NULL, no_argument, NULL, 0 },
81 size_t md_longopts_size = sizeof (md_longopts);
83 const char * md_shortopts = "";
85 /* Mach selected from command line. */
86 static int ms1_mach = bfd_mach_ms1;
87 static unsigned ms1_mach_bitmask = 1 << MACH_MS1;
89 /* Flags to set in the elf header */
90 static flagword ms1_flags = EF_MS1_CPU_MRISC;
92 /* The architecture to use. */
93 enum ms1_architectures
101 /* MS1 architecture we are using for this output file. */
102 static enum ms1_architectures ms1_arch = ms1_64_001;
105 md_parse_option (int c ATTRIBUTE_UNUSED, char * arg)
110 if (strcasecmp (arg, "MS1-64-001") == 0)
112 ms1_flags = (ms1_flags & ~EF_MS1_CPU_MASK) | EF_MS1_CPU_MRISC;
113 ms1_mach = bfd_mach_ms1;
114 ms1_mach_bitmask = 1 << MACH_MS1;
115 ms1_arch = ms1_64_001;
117 else if (strcasecmp (arg, "MS1-16-002") == 0)
119 ms1_flags = (ms1_flags & ~EF_MS1_CPU_MASK) | EF_MS1_CPU_MRISC;
120 ms1_mach = bfd_mach_ms1;
121 ms1_mach_bitmask = 1 << MACH_MS1;
122 ms1_arch = ms1_16_002;
124 else if (strcasecmp (arg, "MS1-16-003") == 0)
126 ms1_flags = (ms1_flags & ~EF_MS1_CPU_MASK) | EF_MS1_CPU_MRISC2;
127 ms1_mach = bfd_mach_mrisc2;
128 ms1_mach_bitmask = 1 << MACH_MS1_003;
129 ms1_arch = ms1_16_003;
131 else if (strcasecmp (arg, "MS2") == 0)
133 ms1_flags = (ms1_flags & ~EF_MS1_CPU_MASK) | EF_MS1_CPU_MS2;
134 ms1_mach = bfd_mach_mrisc2;
135 ms1_mach_bitmask = 1 << MACH_MS2;
138 case OPTION_NO_SCHED_REST:
139 no_scheduling_restrictions = 1;
150 md_show_usage (FILE * stream)
152 fprintf (stream, _("MS1 specific command line options:\n"));
153 fprintf (stream, _(" -march=ms1-64-001 allow ms1-64-001 instructions (default) \n"));
154 fprintf (stream, _(" -march=ms1-16-002 allow ms1-16-002 instructions \n"));
155 fprintf (stream, _(" -march=ms1-16-003 allow ms1-16-003 instructions \n"));
156 fprintf (stream, _(" -march=ms2 allow ms2 instructions \n"));
157 fprintf (stream, _(" -nosched disable scheduling restrictions \n"));
164 /* Initialize the `cgen' interface. */
166 /* Set the machine number and endian. */
167 gas_cgen_cpu_desc = ms1_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, ms1_mach_bitmask,
168 CGEN_CPU_OPEN_ENDIAN,
171 ms1_cgen_init_asm (gas_cgen_cpu_desc);
173 /* This is a callback from cgen to gas to parse operands. */
174 cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
176 /* Set the ELF flags if desired. */
178 bfd_set_private_flags (stdoutput, ms1_flags);
180 /* Set the machine type. */
181 bfd_default_set_arch_mach (stdoutput, bfd_arch_ms1, ms1_mach);
185 md_assemble (char * str)
187 static long delayed_load_register = 0;
188 static long prev_delayed_load_register = 0;
189 static int last_insn_had_delay_slot = 0;
190 static int last_insn_in_noncond_delay_slot = 0;
191 static int last_insn_has_load_delay = 0;
192 static int last_insn_was_memory_access = 0;
193 static int last_insn_was_io_insn = 0;
194 static int last_insn_was_arithmetic_or_logic = 0;
195 static int last_insn_was_branch_insn = 0;
196 static int last_insn_was_conditional_branch_insn = 0;
201 /* Initialize GAS's cgen interface for a new instruction. */
202 gas_cgen_init_parse ();
204 insn.insn = ms1_cgen_assemble_insn
205 (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
209 as_bad ("%s", errmsg);
213 /* Doesn't really matter what we pass for RELAX_P here. */
214 gas_cgen_finish_insn (insn.insn, insn.buffer,
215 CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
218 /* Handle Scheduling Restrictions. */
219 if (!no_scheduling_restrictions)
221 /* Detect consecutive Memory Accesses. */
222 if (last_insn_was_memory_access
223 && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_MEMORY_ACCESS)
224 && ms1_mach == ms1_64_001)
225 as_warn (_("instruction %s may not follow another memory access instruction."),
226 CGEN_INSN_NAME (insn.insn));
228 /* Detect consecutive I/O Instructions. */
229 else if (last_insn_was_io_insn
230 && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_IO_INSN))
231 as_warn (_("instruction %s may not follow another I/O instruction."),
232 CGEN_INSN_NAME (insn.insn));
234 /* Detect consecutive branch instructions. */
235 else if (last_insn_was_branch_insn
236 && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_BR_INSN))
237 as_warn (_("%s may not occupy the delay slot of another branch insn."),
238 CGEN_INSN_NAME (insn.insn));
240 /* Detect data dependencies on delayed loads: memory and input insns. */
241 if (last_insn_has_load_delay && delayed_load_register)
243 if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR1)
244 && insn.fields.f_sr1 == delayed_load_register)
245 as_warn (_("operand references R%ld of previous load."),
248 if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR2)
249 && insn.fields.f_sr2 == delayed_load_register)
250 as_warn (_("operand references R%ld of previous load."),
254 /* Detect JAL/RETI hazard */
256 && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_JAL_HAZARD))
258 if ((CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR1)
259 && insn.fields.f_sr1 == delayed_load_register)
260 || (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR2)
261 && insn.fields.f_sr2 == delayed_load_register))
262 as_warn (_("operand references R%ld of previous instrutcion."),
263 delayed_load_register);
264 else if ((CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR1)
265 && insn.fields.f_sr1 == prev_delayed_load_register)
266 || (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR2)
267 && insn.fields.f_sr2 == prev_delayed_load_register))
268 as_warn (_("operand references R%ld of instructcion before previous."),
269 prev_delayed_load_register);
272 /* Detect data dependency between conditional branch instruction
273 and an immediately preceding arithmetic or logical instruction. */
274 if (last_insn_was_arithmetic_or_logic
275 && !last_insn_in_noncond_delay_slot
276 && (delayed_load_register != 0)
277 && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_BR_INSN)
278 && ms1_arch == ms1_64_001)
280 if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR1)
281 && insn.fields.f_sr1 == delayed_load_register)
282 as_warn (_("conditional branch or jal insn's operand references R%ld of previous arithmetic or logic insn."),
285 if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR2)
286 && insn.fields.f_sr2 == delayed_load_register)
287 as_warn (_("conditional branch or jal insn's operand references R%ld of previous arithmetic or logic insn."),
292 /* Keep track of details of this insn for processing next insn. */
293 last_insn_in_noncond_delay_slot = last_insn_was_branch_insn
294 && !last_insn_was_conditional_branch_insn;
296 last_insn_had_delay_slot =
297 CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_DELAY_SLOT);
299 last_insn_has_load_delay =
300 CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_LOAD_DELAY);
302 last_insn_was_memory_access =
303 CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_MEMORY_ACCESS);
305 last_insn_was_io_insn =
306 CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_IO_INSN);
308 last_insn_was_arithmetic_or_logic =
309 CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_AL_INSN);
311 last_insn_was_branch_insn =
312 CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_BR_INSN);
314 last_insn_was_conditional_branch_insn =
315 CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_BR_INSN)
316 && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR2);
318 prev_delayed_load_register = delayed_load_register;
320 if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRDR))
321 delayed_load_register = insn.fields.f_dr;
322 else if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRDRRR))
323 delayed_load_register = insn.fields.f_drrr;
324 else /* Insns has no destination register. */
325 delayed_load_register = 0;
327 /* Generate dwarf2 line numbers. */
328 dwarf2_emit_insn (4);
332 md_section_align (segT segment, valueT size)
334 int align = bfd_get_section_alignment (stdoutput, segment);
336 return ((size + (1 << align) - 1) & (-1 << align));
340 md_undefined_symbol (char * name ATTRIBUTE_UNUSED)
346 md_estimate_size_before_relax (fragS * fragP ATTRIBUTE_UNUSED,
347 segT segment ATTRIBUTE_UNUSED)
349 as_fatal (_("md_estimate_size_before_relax\n"));
353 /* *fragP has been relaxed to its final size, and now needs to have
354 the bytes inside it modified to conform to the new size.
356 Called after relaxation is finished.
357 fragP->fr_type == rs_machine_dependent.
358 fragP->fr_subtype is the subtype of what the address relaxed to. */
361 md_convert_frag (bfd * abfd ATTRIBUTE_UNUSED,
362 segT sec ATTRIBUTE_UNUSED,
363 fragS * fragP ATTRIBUTE_UNUSED)
368 /* Functions concerning relocs. */
371 md_pcrel_from_section (fixS *fixP, segT sec)
373 if (fixP->fx_addsy != (symbolS *) NULL
374 && (!S_IS_DEFINED (fixP->fx_addsy)
375 || S_GET_SEGMENT (fixP->fx_addsy) != sec))
376 /* The symbol is undefined (or is defined but not in this section).
377 Let the linker figure it out. */
380 /* Return the address of the opcode - cgen adjusts for opcode size
381 itself, to be consistent with the disassembler, which must do
383 return fixP->fx_where + fixP->fx_frag->fr_address;
387 /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
388 Returns BFD_RELOC_NONE if no reloc type can be found.
389 *FIXP may be modified if desired. */
391 bfd_reloc_code_real_type
392 md_cgen_lookup_reloc (const CGEN_INSN * insn ATTRIBUTE_UNUSED,
393 const CGEN_OPERAND * operand,
394 fixS * fixP ATTRIBUTE_UNUSED)
396 bfd_reloc_code_real_type result;
398 result = BFD_RELOC_NONE;
400 switch (operand->type)
402 case MS1_OPERAND_IMM16O:
403 result = BFD_RELOC_16_PCREL;
405 /* fixP->fx_no_overflow = 1; */
407 case MS1_OPERAND_IMM16:
408 case MS1_OPERAND_IMM16Z:
409 /* These may have been processed at parse time. */
410 if (fixP->fx_cgen.opinfo != 0)
411 result = fixP->fx_cgen.opinfo;
412 fixP->fx_no_overflow = 1;
414 case MS1_OPERAND_LOOPSIZE:
415 result = BFD_RELOC_MS1_PCINSN8;
417 /* Adjust for the delay slot, which is not part of the loop */
418 fixP->fx_offset -= 8;
421 result = BFD_RELOC_NONE;
428 /* Write a value out to the object file, using the appropriate endianness. */
431 md_number_to_chars (char * buf, valueT val, int n)
433 number_to_chars_bigendian (buf, val, n);
436 /* Turn a string in input_line_pointer into a floating point constant of type
437 type, and store the appropriate bytes in *litP. The number of LITTLENUMS
438 emitted is stored in *sizeP . An error message is returned, or NULL on OK. */
440 /* Equal to MAX_PRECISION in atof-ieee.c. */
441 #define MAX_LITTLENUMS 6
444 md_atof (type, litP, sizeP)
450 LITTLENUM_TYPE words [MAX_LITTLENUMS];
451 LITTLENUM_TYPE * wordP;
470 /* FIXME: Some targets allow other format chars for bigger sizes here. */
474 return _("Bad call to md_atof()");
477 t = atof_ieee (input_line_pointer, type, words);
479 input_line_pointer = t;
480 * sizeP = prec * sizeof (LITTLENUM_TYPE);
482 /* This loops outputs the LITTLENUMs in REVERSE order;
483 in accord with the ms1 endianness. */
484 for (wordP = words; prec--;)
486 md_number_to_chars (litP, (valueT) (*wordP++), sizeof (LITTLENUM_TYPE));
487 litP += sizeof (LITTLENUM_TYPE);
493 /* See whether we need to force a relocation into the output file. */
496 ms1_force_relocation (fixS * fixp ATTRIBUTE_UNUSED)
502 ms1_apply_fix (fixS *fixP, valueT *valueP, segT seg)
504 if ((fixP->fx_pcrel != 0) && (fixP->fx_r_type == BFD_RELOC_32))
505 fixP->fx_r_type = BFD_RELOC_32_PCREL;
507 gas_cgen_md_apply_fix (fixP, valueP, seg);
511 ms1_fix_adjustable (fixS * fixP)
513 bfd_reloc_code_real_type reloc_type;
515 if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED)
517 const CGEN_INSN *insn = NULL;
518 int opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED;
519 const CGEN_OPERAND *operand;
521 operand = cgen_operand_lookup_by_num(gas_cgen_cpu_desc, opindex);
522 reloc_type = md_cgen_lookup_reloc (insn, operand, fixP);
525 reloc_type = fixP->fx_r_type;
527 if (fixP->fx_addsy == NULL)
530 /* Prevent all adjustments to global symbols. */
531 if (S_IS_EXTERNAL (fixP->fx_addsy))
534 if (S_IS_WEAK (fixP->fx_addsy))