1 /* tc-fr30.c -- Assembler for the Fujitsu FR30.
2 Copyright 1998, 1999, 2000, 2001, 2002 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 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 "safe-ctype.h"
26 #include "opcodes/fr30-desc.h"
27 #include "opcodes/fr30-opc.h"
30 /* Structure to hold all of the different components describing
31 an individual instruction. */
34 const CGEN_INSN * insn;
35 const CGEN_INSN * orig_insn;
38 CGEN_INSN_INT buffer [1];
39 #define INSN_VALUE(buf) (*(buf))
41 unsigned char buffer [CGEN_MAX_INSN_SIZE];
42 #define INSN_VALUE(buf) (buf)
47 fixS * fixups [GAS_CGEN_MAX_FIXUPS];
48 int indices [MAX_OPERAND_INSTANCES];
52 const char comment_chars[] = ";";
53 const char line_comment_chars[] = "#";
54 const char line_separator_chars[] = "|";
55 const char EXP_CHARS[] = "eE";
56 const char FLT_CHARS[] = "dD";
58 #define FR30_SHORTOPTS ""
59 const char * md_shortopts = FR30_SHORTOPTS;
61 struct option md_longopts[] =
63 {NULL, no_argument, NULL, 0}
65 size_t md_longopts_size = sizeof (md_longopts);
68 md_parse_option (c, arg)
69 int c ATTRIBUTE_UNUSED;
70 char *arg ATTRIBUTE_UNUSED;
81 md_show_usage (stream)
84 fprintf (stream, _(" FR30 specific command line options:\n"));
87 /* The target specific pseudo-ops which we support. */
88 const pseudo_typeS md_pseudo_table[] =
98 /* Initialize the `cgen' interface. */
100 /* Set the machine number and endian. */
101 gas_cgen_cpu_desc = fr30_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,
102 CGEN_CPU_OPEN_ENDIAN,
105 fr30_cgen_init_asm (gas_cgen_cpu_desc);
107 /* This is a callback from cgen to gas to parse operands. */
108 cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
115 static int last_insn_had_delay_slot = 0;
119 /* Initialize GAS's cgen interface for a new instruction. */
120 gas_cgen_init_parse ();
122 insn.insn = fr30_cgen_assemble_insn
123 (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
131 /* Doesn't really matter what we pass for RELAX_P here. */
132 gas_cgen_finish_insn (insn.insn, insn.buffer,
133 CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
135 /* Warn about invalid insns in delay slots. */
136 if (last_insn_had_delay_slot
137 && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_NOT_IN_DELAY_SLOT))
138 as_warn (_("Instruction %s not allowed in a delay slot."),
139 CGEN_INSN_NAME (insn.insn));
141 last_insn_had_delay_slot
142 = CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_DELAY_SLOT);
145 /* The syntax in the manual says constants begin with '#'.
146 We just ignore it. */
149 md_operand (expressionP)
150 expressionS * expressionP;
152 if (* input_line_pointer == '#')
154 input_line_pointer ++;
155 expression (expressionP);
160 md_section_align (segment, size)
164 int align = bfd_get_section_alignment (stdoutput, segment);
165 return ((size + (1 << align) - 1) & (-1 << align));
169 md_undefined_symbol (name)
170 char *name ATTRIBUTE_UNUSED;
175 /* Interface to relax_segment. */
177 /* FIXME: Build table by hand, get it working, then machine generate. */
179 const relax_typeS md_relax_table[] =
182 1) most positive reach of this state,
183 2) most negative reach of this state,
184 3) how many bytes this mode will add to the size of the current frag
185 4) which index into the table to try if we can't fit into this one. */
187 /* The first entry must be unused because an `rlx_more' value of zero ends
191 /* The displacement used by GAS is from the end of the 2 byte insn,
192 so we subtract 2 from the following. */
193 /* 16 bit insn, 8 bit disp -> 10 bit range.
194 This doesn't handle a branch in the right slot at the border:
195 the "& -4" isn't taken into account. It's not important enough to
196 complicate things over it, so we subtract an extra 2 (or + 2 in -ve
198 {511 - 2 - 2, -512 - 2 + 2, 0, 2 },
199 /* 32 bit insn, 24 bit disp -> 26 bit range. */
200 {0x2000000 - 1 - 2, -0x2000000 - 2, 2, 0 },
201 /* Same thing, but with leading nop for alignment. */
202 {0x2000000 - 1 - 2, -0x2000000 - 2, 4, 0 }
207 fr30_relax_frag (segment, fragP, stretch)
212 /* Address of branch insn. */
213 long address = fragP->fr_address + fragP->fr_fix - 2;
216 /* Keep 32 bit insns aligned on 32 bit boundaries. */
217 if (fragP->fr_subtype == 2)
219 if ((address & 3) != 0)
221 fragP->fr_subtype = 3;
225 else if (fragP->fr_subtype == 3)
227 if ((address & 3) == 0)
229 fragP->fr_subtype = 2;
235 growth = relax_frag (segment, fragP, stretch);
237 /* Long jump on odd halfword boundary? */
238 if (fragP->fr_subtype == 2 && (address & 3) != 0)
240 fragP->fr_subtype = 3;
249 /* Return an initial guess of the length by which a fragment must grow to
250 hold a branch to reach its destination.
251 Also updates fr_type/fr_subtype as necessary.
253 Called just before doing relaxation.
254 Any symbol that is now undefined will not become defined.
255 The guess for fr_var is ACTUALLY the growth beyond fr_fix.
256 Whatever we do to grow fr_fix or fr_var contributes to our returned value.
257 Although it may not be explicit in the frag, pretend fr_var starts with a
261 md_estimate_size_before_relax (fragP, segment)
265 /* The only thing we have to handle here are symbols outside of the
266 current segment. They may be undefined or in a different segment in
267 which case linker scripts may place them anywhere.
268 However, we can't finish the fragment here and emit the reloc as insn
269 alignment requirements may move the insn about. */
271 if (S_GET_SEGMENT (fragP->fr_symbol) != segment)
274 int old_fr_fix = fragP->fr_fix;
277 /* The symbol is undefined in this segment.
278 Change the relaxation subtype to the max allowable and leave
279 all further handling to md_convert_frag. */
280 fragP->fr_subtype = 2;
282 #if 0 /* Can't use this, but leave in for illustration. */
283 /* Change 16 bit insn to 32 bit insn. */
284 fragP->fr_opcode[0] |= 0x80;
286 /* Increase known (fixed) size of fragment. */
289 /* Create a relocation for it. */
290 fix_new (fragP, old_fr_fix, 4,
292 fragP->fr_offset, 1 /* pcrel */,
293 /* FIXME: Can't use a real BFD reloc here.
294 gas_cgen_md_apply_fix3 can't handle it. */
295 BFD_RELOC_FR30_26_PCREL);
297 /* Mark this fragment as finished. */
299 return fragP->fr_fix - old_fr_fix;
302 const CGEN_INSN * insn;
305 /* Update the recorded insn.
306 Fortunately we don't have to look very far.
307 FIXME: Change this to record in the instruction the next higher
308 relaxable insn to use. */
309 for (i = 0, insn = fragP->fr_cgen.insn; i < 4; i++, insn++)
311 if ((strcmp (CGEN_INSN_MNEMONIC (insn),
312 CGEN_INSN_MNEMONIC (fragP->fr_cgen.insn))
314 && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX))
320 fragP->fr_cgen.insn = insn;
326 /* Return the size of the variable part of the frag. */
327 return md_relax_table[fragP->fr_subtype].rlx_length;
330 /* *fragP has been relaxed to its final size, and now needs to have
331 the bytes inside it modified to conform to the new size.
333 Called after relaxation is finished.
334 fragP->fr_type == rs_machine_dependent.
335 fragP->fr_subtype is the subtype of what the address relaxed to. */
338 md_convert_frag (abfd, sec, fragP)
339 bfd *abfd ATTRIBUTE_UNUSED;
340 segT sec ATTRIBUTE_UNUSED;
341 fragS *fragP ATTRIBUTE_UNUSED;
351 opcode = fragP->fr_opcode;
353 /* Address opcode resides at in file space. */
354 opcode_address = fragP->fr_address + fragP->fr_fix - 2;
356 switch (fragP->fr_subtype)
360 displacement = & opcode[1];
365 displacement = & opcode[1];
368 opcode[2] = opcode[0] | 0x80;
369 md_number_to_chars (opcode, PAR_NOP_INSN, 2);
372 displacement = & opcode[3];
378 if (S_GET_SEGMENT (fragP->fr_symbol) != sec)
380 /* symbol must be resolved by linker */
381 if (fragP->fr_offset & 3)
382 as_warn (_("Addend to unresolved symbol not on word boundary."));
383 addend = fragP->fr_offset >> 2;
387 /* Address we want to reach in file space. */
388 target_address = S_GET_VALUE (fragP->fr_symbol) + fragP->fr_offset;
389 addend = (target_address - (opcode_address & -4)) >> 2;
392 /* Create a relocation for symbols that must be resolved by the linker.
393 Otherwise output the completed insn. */
395 if (S_GET_SEGMENT (fragP->fr_symbol) != sec)
397 assert (fragP->fr_subtype != 1);
398 assert (fragP->fr_cgen.insn != 0);
399 gas_cgen_record_fixup (fragP,
400 /* Offset of branch insn in frag. */
401 fragP->fr_fix + extension - 4,
404 /* FIXME: quick hack */
406 CGEN_OPERAND_ENTRY (fragP->fr_cgen.opindex),
408 CGEN_OPERAND_ENTRY (FR30_OPERAND_DISP24),
410 fragP->fr_cgen.opinfo,
411 fragP->fr_symbol, fragP->fr_offset);
414 #define SIZE_FROM_RELAX_STATE(n) ((n) == 1 ? 1 : 3)
416 md_number_to_chars (displacement, (valueT) addend,
417 SIZE_FROM_RELAX_STATE (fragP->fr_subtype));
419 fragP->fr_fix += extension;
423 /* Functions concerning relocs. */
425 /* The location from which a PC relative jump should be calculated,
426 given a PC relative reloc. */
429 md_pcrel_from_section (fixP, sec)
433 if (fixP->fx_addsy != (symbolS *) NULL
434 && (! S_IS_DEFINED (fixP->fx_addsy)
435 || S_GET_SEGMENT (fixP->fx_addsy) != sec))
437 /* The symbol is undefined (or is defined but not in this section).
438 Let the linker figure it out. */
442 return (fixP->fx_frag->fr_address + fixP->fx_where) & ~1;
445 /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
446 Returns BFD_RELOC_NONE if no reloc type can be found.
447 *FIXP may be modified if desired. */
449 bfd_reloc_code_real_type
450 md_cgen_lookup_reloc (insn, operand, fixP)
451 const CGEN_INSN *insn ATTRIBUTE_UNUSED;
452 const CGEN_OPERAND *operand;
455 switch (operand->type)
457 case FR30_OPERAND_LABEL9: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_9_PCREL;
458 case FR30_OPERAND_LABEL12: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_12_PCREL;
459 case FR30_OPERAND_DISP10: return BFD_RELOC_FR30_10_IN_8;
460 case FR30_OPERAND_DISP9: return BFD_RELOC_FR30_9_IN_8;
461 case FR30_OPERAND_DISP8: return BFD_RELOC_FR30_8_IN_8;
462 case FR30_OPERAND_UDISP6: return BFD_RELOC_FR30_6_IN_4;
463 case FR30_OPERAND_I8: return BFD_RELOC_8;
464 case FR30_OPERAND_I32: return BFD_RELOC_FR30_48;
465 case FR30_OPERAND_I20: return BFD_RELOC_FR30_20;
466 default : /* avoid -Wall warning */
470 return BFD_RELOC_NONE;
473 /* See whether we need to force a relocation into the output file.
474 This is used to force out switch and PC relative relocations when
478 fr30_force_relocation (fix)
481 if (fix->fx_r_type == BFD_RELOC_VTABLE_INHERIT
482 || fix->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
485 return S_FORCE_RELOC (fix->fx_addsy);
488 /* Write a value out to the object file, using the appropriate endianness. */
491 md_number_to_chars (buf, val, n)
496 number_to_chars_bigendian (buf, val, n);
499 /* Turn a string in input_line_pointer into a floating point constant of type
500 type, and store the appropriate bytes in *litP. The number of LITTLENUMS
501 emitted is stored in *sizeP . An error message is returned, or NULL on OK.
504 /* Equal to MAX_PRECISION in atof-ieee.c */
505 #define MAX_LITTLENUMS 6
508 md_atof (type, litP, sizeP)
515 LITTLENUM_TYPE words [MAX_LITTLENUMS];
534 /* FIXME: Some targets allow other format chars for bigger sizes here. */
538 return _("Bad call to md_atof()");
541 t = atof_ieee (input_line_pointer, type, words);
543 input_line_pointer = t;
544 * sizeP = prec * sizeof (LITTLENUM_TYPE);
546 for (i = 0; i < prec; i++)
548 md_number_to_chars (litP, (valueT) words[i],
549 sizeof (LITTLENUM_TYPE));
550 litP += sizeof (LITTLENUM_TYPE);
556 /* Worker function for fr30_is_colon_insn(). */
557 static char restore_colon PARAMS ((int));
560 restore_colon (advance_i_l_p_by)
561 int advance_i_l_p_by;
565 /* Restore the colon, and advance input_line_pointer to
566 the end of the new symbol. */
567 * input_line_pointer = ':';
568 input_line_pointer += advance_i_l_p_by;
569 c = * input_line_pointer;
570 * input_line_pointer = 0;
575 /* Determines if the symbol starting at START and ending in
576 a colon that was at the location pointed to by INPUT_LINE_POINTER
577 (but which has now been replaced bu a NUL) is in fact an
578 LDI:8, LDI:20, LDI:32, CALL:D. JMP:D, RET:D or Bcc:D instruction.
579 If it is, then it restores the colon, advances INPUT_LINE_POINTER
580 to the real end of the instruction/symbol, and returns the character
581 that really terminated the symbol. Otherwise it returns 0. */
583 fr30_is_colon_insn (start)
586 char * i_l_p = input_line_pointer;
588 /* Check to see if the symbol parsed so far is 'ldi' */
589 if ( (start[0] != 'l' && start[0] != 'L')
590 || (start[1] != 'd' && start[1] != 'D')
591 || (start[2] != 'i' && start[2] != 'I')
594 /* Nope - check to see a 'd' follows the colon. */
595 if ( (i_l_p[1] == 'd' || i_l_p[1] == 'D')
596 && (i_l_p[2] == ' ' || i_l_p[2] == '\t' || i_l_p[2] == '\n'))
598 /* Yup - it might be delay slot instruction. */
600 static char * delay_insns [] =
602 "call", "jmp", "ret", "bra", "bno",
603 "beq", "bne", "bc", "bnc", "bn",
604 "bp", "bv", "bnv", "blt", "bge",
605 "ble", "bgt", "bls", "bhi"
608 for (i = sizeof (delay_insns) / sizeof (delay_insns[0]); i--;)
610 char * insn = delay_insns[i];
611 int len = strlen (insn);
613 if (start [len] != 0)
617 if (TOLOWER (start [len]) != insn [len])
621 return restore_colon (1);
625 /* Nope - it is a normal label. */
629 /* Check to see if the text following the colon is '8' */
630 if (i_l_p[1] == '8' && (i_l_p[2] == ' ' || i_l_p[2] == '\t'))
631 return restore_colon (2);
633 /* Check to see if the text following the colon is '20' */
634 else if (i_l_p[1] == '2' && i_l_p[2] =='0' && (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
635 return restore_colon (3);
637 /* Check to see if the text following the colon is '32' */
638 else if (i_l_p[1] == '3' && i_l_p[2] =='2' && (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
639 return restore_colon (3);
645 fr30_fix_adjustable (fixP)
648 /* We need the symbol name for the VTABLE entries */
649 if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT
650 || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY)