1 /* Disassembler code for CR16.
2 Copyright 2007 Free Software Foundation, Inc.
5 This file is part of GAS, GDB and the GNU binutils.
7 This program is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 3, or (at your option)
12 This program is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software Foundation,
19 Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
23 #include "opcode/cr16.h"
24 #include "libiberty.h"
26 /* String to print when opcode was not matched. */
27 #define ILLEGAL "illegal"
28 /* Escape to 16-bit immediate. */
29 #define ESCAPE_16_BIT 0xB
31 /* Extract 'n_bits' from 'a' starting from offset 'offs'. */
32 #define EXTRACT(a, offs, n_bits) \
33 (n_bits == 32 ? (((a) >> (offs)) & 0xffffffffL) \
34 : (((a) >> (offs)) & ((1 << (n_bits)) -1)))
36 /* Set Bit Mask - a mask to set all bits starting from offset 'offs'. */
37 #define SBM(offs) ((((1 << (32 - offs)) -1) << (offs)))
39 typedef unsigned long dwordU;
40 typedef unsigned short wordU;
48 /* Structure to map valid 'cinv' instruction options. */
52 /* Cinv printed string. */
54 /* Value corresponding to the string. */
59 /* CR16 'cinv' options mapping. */
60 const cinv_entry cr16_cinvs[] =
62 {"cinv[i]", "cinv [i]"},
63 {"cinv[i,u]", "cinv [i,u]"},
64 {"cinv[d]", "cinv [d]"},
65 {"cinv[d,u]", "cinv [d,u]"},
66 {"cinv[d,i]", "cinv [d,i]"},
67 {"cinv[d,i,u]", "cinv [d,i,u]"}
70 /* Number of valid 'cinv' instruction options. */
71 static int NUMCINVS = ARRAY_SIZE (cr16_cinvs);
73 /* Enum to distinguish different registers argument types. */
74 typedef enum REG_ARG_TYPE
76 /* General purpose register (r<N>). */
78 /*Processor register */
83 /* Current opcode table entry we're disassembling. */
84 const inst *instruction;
85 /* Current instruction we're disassembling. */
87 /* The current instruction is read into 3 consecutive words. */
89 /* Contains all words in appropriate order. */
91 /* Holds the current processed argument number. */
92 int processing_argument_number;
93 /* Nonzero means a IMM4 instruction. */
95 /* Nonzero means the instruction's original size is
96 incremented (escape sequence is used). */
100 /* Print the constant expression length. */
103 print_exp_len (int size)
126 /* Retrieve the number of operands for the current assembled instruction. */
129 get_number_of_operands (void)
133 for (i = 0; instruction->operands[i].op_type && i < MAX_OPERANDS; i++)
139 /* Return the bit size for a given operand. */
142 getbits (operand_type op)
145 return cr16_optab[op].bit_size;
150 /* Return the argument type of a given operand. */
153 getargtype (operand_type op)
156 return cr16_optab[op].arg_type;
161 /* Given a 'CC' instruction constant operand, return its corresponding
162 string. This routine is used when disassembling the 'CC' instruction. */
165 getccstring (unsigned cc)
167 return (char *) cr16_b_cond_tab[cc];
171 /* Given a 'cinv' instruction constant operand, return its corresponding
172 string. This routine is used when disassembling the 'cinv' instruction. */
175 getcinvstring (const char *str)
177 const cinv_entry *cinv;
179 for (cinv = cr16_cinvs; cinv < (cr16_cinvs + NUMCINVS); cinv++)
180 if (strcmp (cinv->istr, str) == 0)
186 /* Given the trap index in dispatch table, return its name.
187 This routine is used when disassembling the 'excp' instruction. */
190 gettrapstring (unsigned int index)
192 const trap_entry *trap;
194 for (trap = cr16_traps; trap < cr16_traps + NUMTRAPS; trap++)
195 if (trap->entry == index)
201 /* Given a register enum value, retrieve its name. */
206 const reg_entry *reg = cr16_regtab + r;
208 if (reg->type != CR16_R_REGTYPE)
214 /* Given a register pair enum value, retrieve its name. */
219 const reg_entry *reg = cr16_regptab + r;
221 if (reg->type != CR16_RP_REGTYPE)
227 /* Given a index register pair enum value, retrieve its name. */
230 getidxregpname (reg r)
232 const reg_entry *reg;
236 case 0: r = 0; break;
237 case 1: r = 2; break;
238 case 2: r = 4; break;
239 case 3: r = 6; break;
240 case 4: r = 8; break;
241 case 5: r = 10; break;
242 case 6: r = 3; break;
243 case 7: r = 5; break;
248 reg = cr16_regptab + r;
250 if (reg->type != CR16_RP_REGTYPE)
256 /* Getting a processor register name. */
259 getprocregname (int index)
263 for (r = cr16_pregtab; r < cr16_pregtab + NUMPREGS; r++)
264 if (r->image == index)
267 return "ILLEGAL REGISTER";
270 /* Getting a processor register name - 32 bit size. */
273 getprocpregname (int index)
277 for (r = cr16_pregptab; r < cr16_pregptab + NUMPREGPS; r++)
278 if (r->image == index)
281 return "ILLEGAL REGISTER";
284 /* START and END are relating 'allWords' struct, which is 48 bits size.
287 +---------+---------+---------+---------+
289 +---------+---------+---------+---------+
294 makelongparameter (ULONGLONG val, int start, int end)
298 p.val = (dwordU) EXTRACT (val, 48 - end, end - start);
299 p.nbits = end - start;
303 /* Build a mask of the instruction's 'constant' opcode,
304 based on the instruction's printing flags. */
309 unsigned long mask = SBM (instruction->match_bits);
313 /* Search for a matching opcode. Return 1 for success, 0 for failure. */
319 /* The instruction 'constant' opcode doewsn't exceed 32 bits. */
320 unsigned long doubleWord = words[1] + (words[0] << 16);
322 /* Start searching from end of instruction table. */
323 instruction = &cr16_instruction[NUMOPCODES - 2];
325 /* Loop over instruction table until a full match is found. */
326 while (instruction >= cr16_instruction)
328 mask = build_mask ();
329 if ((doubleWord & mask) == BIN (instruction->match,
330 instruction->match_bits))
338 /* Set the proper parameter value for different type of arguments. */
341 make_argument (argument * a, int start_bits)
346 if ((instruction->size == 3) && a->size >= 16)
354 p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
355 inst_bit_size - start_bits);
360 p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
361 inst_bit_size - start_bits);
366 p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
367 inst_bit_size - start_bits);
372 p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
373 inst_bit_size - start_bits);
378 p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
379 inst_bit_size - start_bits);
384 p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
385 inst_bit_size - start_bits);
391 if ((IS_INSN_MNEMONIC ("cbitb"))
392 || (IS_INSN_MNEMONIC ("sbitb"))
393 || (IS_INSN_MNEMONIC ("tbitb")))
394 p = makelongparameter (allWords, 8, 9);
396 p = makelongparameter (allWords, 9, 10);
398 p = makelongparameter (allWords, inst_bit_size - a->size, inst_bit_size);
403 p = makelongparameter (allWords, start_bits + 12, start_bits + 13);
405 p = makelongparameter (allWords, start_bits + 13, start_bits + 16);
407 if (inst_bit_size > 32)
409 p = makelongparameter (allWords, inst_bit_size - start_bits - 12,
411 a->constant = ((p.val & 0xffff) | (p.val >> 8 & 0xf0000));
413 else if (instruction->size == 2)
415 p = makelongparameter (allWords, inst_bit_size - 22, inst_bit_size);
416 a->constant = (p.val & 0xf) | (((p.val >>20) & 0x3) << 4)
417 | ((p.val >>14 & 0x3) << 6) | (((p.val >>7) & 0x1f) <<7);
419 else if (instruction->size == 1 && a->size == 0)
425 p = makelongparameter (allWords, inst_bit_size, inst_bit_size);
427 p = makelongparameter (allWords, inst_bit_size - (start_bits + 4),
428 inst_bit_size - start_bits);
433 p = makelongparameter (allWords, start_bits + 12, start_bits + 16);
435 p = makelongparameter (allWords, inst_bit_size - 16, inst_bit_size);
440 if (instruction->size == 1)
441 p = makelongparameter (allWords, 12, 16);
443 p = makelongparameter (allWords, start_bits + 12, start_bits + 16);
446 if (inst_bit_size > 32)
448 p = makelongparameter (allWords, inst_bit_size - start_bits - 12,
450 a->constant = ((p.val & 0xffff) | (p.val >> 8 & 0xf0000));
452 else if (instruction->size == 2)
454 p = makelongparameter (allWords, inst_bit_size - 16, inst_bit_size);
457 else if (instruction->size == 1 && a->size != 0)
459 p = makelongparameter (allWords, 4, 8);
460 if (IS_INSN_MNEMONIC ("loadw")
461 || IS_INSN_MNEMONIC ("loadd")
462 || IS_INSN_MNEMONIC ("storw")
463 || IS_INSN_MNEMONIC ("stord"))
464 a->constant = (p.val * 2);
468 else /* below case for 0x0(reg pair) */
475 if ((IS_INSN_TYPE (BRANCH_INS))
476 || (IS_INSN_MNEMONIC ("bal"))
477 || (IS_INSN_TYPE (CSTBIT_INS))
478 || (IS_INSN_TYPE (LD_STOR_INS)))
483 p = makelongparameter (allWords, 0, start_bits);
484 a->constant = ((((p.val&0xf00)>>4)) | (p.val&0xf));
488 if (instruction->size == 3)
490 p = makelongparameter (allWords, 16, inst_bit_size);
491 a->constant = ((((p.val>>16)&0xf) << 20)
492 | (((p.val>>24)&0xf) << 16)
495 else if (instruction->size == 2)
497 p = makelongparameter (allWords, 8, inst_bit_size);
503 p = makelongparameter (allWords, inst_bit_size - (start_bits +
504 a->size), inst_bit_size - start_bits);
511 p = makelongparameter (allWords, inst_bit_size -
512 (start_bits + a->size),
513 inst_bit_size - start_bits);
523 /* Print a single argument. */
526 print_arg (argument *a, bfd_vma memaddr, struct disassemble_info *info)
528 LONGLONG longdisp, mask;
532 PTR stream = info->stream;
533 fprintf_ftype func = info->fprintf_func;
538 func (stream, "%s", getregname (a->r));
542 func (stream, "%s", getregpname (a->rp));
546 func (stream, "%s", getprocregname (a->pr));
550 func (stream, "%s", getprocpregname (a->prp));
554 func (stream, "%s", getccstring (a->cc));
555 func (stream, "%s", "\t");
559 if (IS_INSN_MNEMONIC ("excp"))
561 func (stream, "%s", gettrapstring (a->constant));
564 else if ((IS_INSN_TYPE (ARITH_INS) || IS_INSN_TYPE (ARITH_BYTE_INS))
565 && ((instruction->size == 1) && (a->constant == 9)))
566 func (stream, "$%d", -1);
567 else if (INST_HAS_REG_LIST)
568 func (stream, "$0x%lx", a->constant +1);
569 else if (IS_INSN_TYPE (SHIFT_INS))
571 longdisp = a->constant;
572 mask = ((LONGLONG)1 << a->size) - 1;
573 if (longdisp & ((LONGLONG)1 << (a->size -1)))
576 longdisp = ~(longdisp) + 1;
578 a->constant = (unsigned long int) (longdisp & mask);
579 func (stream, "$%d", ((int)(sign_flag ? -a->constant :
583 func (stream, "$0x%lx", a->constant);
586 case 4 : case 5 : case 6 : case 8 :
587 func (stream, "%s", ":s"); break;
588 case 16 : case 20 : func (stream, "%s", ":m"); break;
589 case 24 : case 32 : func (stream, "%s", ":l"); break;
595 if (a->i_r == 0) func (stream, "[r12]");
596 if (a->i_r == 1) func (stream, "[r13]");
597 func (stream, "0x%lx", a->constant);
598 func (stream, "%s", print_exp_len (instruction->size * 16));
602 if (a->i_r == 0) func (stream, "[r12]");
603 if (a->i_r == 1) func (stream, "[r13]");
604 func (stream, "0x%lx", a->constant);
605 func (stream, "%s", print_exp_len (instruction->size * 16));
606 func (stream, "%s", getidxregpname (a->rp));
610 func (stream, "(%s)", getregname (a->r));
614 func (stream, "0x%lx", a->constant);
615 func (stream, "%s", print_exp_len (instruction->size * 16));
616 func (stream, "(%s)", getregname (a->r));
620 func (stream, "0x%lx", a->constant);
621 func (stream, "%s", print_exp_len (instruction->size * 16));
622 func (stream, "%s", getregpname (a->rp));
626 /*Removed the *2 part as because implicit zeros are no more required.
627 Have to fix this as this needs a bit of extension in terms of branch
629 if (IS_INSN_TYPE (BRANCH_INS) || IS_INSN_MNEMONIC ("bal"))
632 longdisp = a->constant;
633 /* REVISIT: To sync with WinIDEA and CR16 4.1tools, the below
635 /* longdisp <<= 1; */
636 mask = ((LONGLONG)1 << a->size) - 1;
642 if (longdisp & ((LONGLONG)1 << a->size))
645 longdisp = ~(longdisp) + 1;
655 longdisp = ~(longdisp) + 1;
660 func (stream, "Wrong offset used in branch/bal instruction");
663 a->constant = (unsigned long int) (longdisp & mask);
665 /* For branch Neq instruction it is 2*offset + 2. */
666 else if (IS_INSN_TYPE (BRANCH_NEQ_INS))
667 a->constant = 2 * a->constant + 2;
669 if ((!IS_INSN_TYPE (CSTBIT_INS)) && (!IS_INSN_TYPE (LD_STOR_INS)))
670 (sign_flag) ? func (stream, "%s", "*-"): func (stream, "%s","*+");
672 func (stream, "%s", "0x");
673 number = ((relative ? memaddr : 0) +
674 (sign_flag ? ((- a->constant) & 0xffffffe) : a->constant));
676 (*info->print_address_func) ((number & ((1 << 24) - 1)), info);
678 func (stream, "%s", print_exp_len (instruction->size * 16));
686 /* Print all the arguments of CURRINSN instruction. */
689 print_arguments (ins *currInsn, bfd_vma memaddr, struct disassemble_info *info)
693 /* For "pop/push/popret RA instruction only. */
694 if ((IS_INSN_MNEMONIC ("pop")
695 || (IS_INSN_MNEMONIC ("popret")
696 || (IS_INSN_MNEMONIC ("push"))))
697 && currInsn->nargs == 1)
699 info->fprintf_func (info->stream, "RA");
703 for (i = 0; i < currInsn->nargs; i++)
705 processing_argument_number = i;
707 /* For "bal (ra), disp17" instruction only. */
708 if ((IS_INSN_MNEMONIC ("bal")) && (i == 0) && instruction->size == 2)
710 info->fprintf_func (info->stream, "(ra),");
714 if ((INST_HAS_REG_LIST) && (i == 2))
715 info->fprintf_func (info->stream, "RA");
717 print_arg (&currInsn->arg[i], memaddr, info);
719 if ((i != currInsn->nargs - 1) && (!IS_INSN_MNEMONIC ("b")))
720 info->fprintf_func (info->stream, ",");
724 /* Build the instruction's arguments. */
727 make_instruction (void)
732 for (i = 0; i < currInsn.nargs; i++)
736 memset (&a, 0, sizeof (a));
737 a.type = getargtype (instruction->operands[i].op_type);
738 a.size = getbits (instruction->operands[i].op_type);
739 shift = instruction->operands[i].shift;
741 make_argument (&a, shift);
745 /* Calculate instruction size (in bytes). */
746 currInsn.size = instruction->size + (size_changed ? 1 : 0);
751 /* Retrieve a single word from a given memory address. */
754 get_word_at_PC (bfd_vma memaddr, struct disassemble_info *info)
760 status = info->read_memory_func (memaddr, buffer, 2, info);
763 insn = (wordU) bfd_getl16 (buffer);
768 /* Retrieve multiple words (3) from a given memory address. */
771 get_words_at_PC (bfd_vma memaddr, struct disassemble_info *info)
776 for (i = 0, mem = memaddr; i < 3; i++, mem += 2)
777 words[i] = get_word_at_PC (mem, info);
780 ((ULONGLONG) words[0] << 32) + ((unsigned long) words[1] << 16) + words[2];
783 /* Prints the instruction by calling print_arguments after proper matching. */
786 print_insn_cr16 (bfd_vma memaddr, struct disassemble_info *info)
788 int is_decoded; /* Nonzero means instruction has a match. */
790 /* Initialize global variables. */
794 /* Retrieve the encoding from current memory location. */
795 get_words_at_PC (memaddr, info);
796 /* Find a matching opcode in table. */
797 is_decoded = match_opcode ();
798 /* If found, print the instruction's mnemonic and arguments. */
799 if (is_decoded > 0 && (words[0] << 16 || words[1]) != 0)
801 if (strneq (instruction->mnemonic, "cinv", 4))
802 info->fprintf_func (info->stream,"%s", getcinvstring (instruction->mnemonic));
804 info->fprintf_func (info->stream, "%s", instruction->mnemonic);
806 if (((currInsn.nargs = get_number_of_operands ()) != 0)
807 && ! (IS_INSN_MNEMONIC ("b")))
808 info->fprintf_func (info->stream, "\t");
810 /* For push/pop/pushrtn with RA instructions. */
811 if ((INST_HAS_REG_LIST) && ((words[0] >> 7) & 0x1))
813 print_arguments (&currInsn, memaddr, info);
814 return currInsn.size;
817 /* No match found. */
818 info->fprintf_func (info->stream,"%s ",ILLEGAL);