| 1 | /* Print mips instructions for GDB, the GNU debugger. |
| 2 | Copyright 1989, 1991, 1992 Free Software Foundation, Inc. |
| 3 | Contributed by Nobuyuki Hikichi(hikichi@sra.co.jp) |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program 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 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program 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. |
| 16 | |
| 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 |
| 19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "symtab.h" |
| 23 | #include "opcode/mips.h" |
| 24 | |
| 25 | /* Mips instructions are never longer than this many bytes. */ |
| 26 | #define MAXLEN 4 |
| 27 | |
| 28 | /* Number of elements in the opcode table. */ |
| 29 | #define NOPCODES (sizeof mips_opcodes / sizeof mips_opcodes[0]) |
| 30 | |
| 31 | #define MKLONG(p) *(unsigned long*)p |
| 32 | |
| 33 | extern char *reg_names[]; |
| 34 | |
| 35 | \f |
| 36 | /* subroutine */ |
| 37 | static unsigned char * |
| 38 | print_insn_arg (d, l, stream, pc) |
| 39 | char *d; |
| 40 | register unsigned long int *l; |
| 41 | FILE *stream; |
| 42 | CORE_ADDR pc; |
| 43 | { |
| 44 | switch (*d) |
| 45 | { |
| 46 | case ',': |
| 47 | case '(': |
| 48 | case ')': |
| 49 | fputc (*d, stream); |
| 50 | break; |
| 51 | |
| 52 | case 's': |
| 53 | fprintf (stream, "$%s", reg_names[((struct op_i_fmt *) l)->rs]); |
| 54 | break; |
| 55 | |
| 56 | case 't': |
| 57 | fprintf (stream, "$%s", reg_names[((struct op_i_fmt *) l)->rt]); |
| 58 | break; |
| 59 | |
| 60 | case 'i': |
| 61 | fprintf (stream, "%d", ((struct op_i_fmt *) l)->immediate); |
| 62 | break; |
| 63 | |
| 64 | case 'j': /* same as i, but sign-extended */ |
| 65 | fprintf (stream, "%d", ((struct op_b_fmt *) l)->delta); |
| 66 | break; |
| 67 | |
| 68 | case 'a': |
| 69 | print_address ((pc & 0xF0000000) | (((struct op_j_fmt *)l)->target << 2), |
| 70 | stream); |
| 71 | break; |
| 72 | |
| 73 | case 'b': |
| 74 | print_address ((((struct op_b_fmt *) l)->delta << 2) + pc + 4, stream); |
| 75 | break; |
| 76 | |
| 77 | case 'd': |
| 78 | fprintf (stream, "$%s", reg_names[((struct op_r_fmt *) l)->rd]); |
| 79 | break; |
| 80 | |
| 81 | case 'h': |
| 82 | fprintf (stream, "0x%x", ((struct op_r_fmt *) l)->shamt); |
| 83 | break; |
| 84 | |
| 85 | case 'S': |
| 86 | fprintf (stream, "$f%d", ((struct fop_r_fmt *) l)->fs); |
| 87 | break; |
| 88 | |
| 89 | case 'T': |
| 90 | fprintf (stream, "$f%d", ((struct fop_r_fmt *) l)->ft); |
| 91 | break; |
| 92 | |
| 93 | case 'D': |
| 94 | fprintf (stream, "$f%d", ((struct fop_r_fmt *) l)->fd); |
| 95 | break; |
| 96 | |
| 97 | default: |
| 98 | fprintf (stream, "# internal error, undefined modifier(%c)", *d); |
| 99 | break; |
| 100 | } |
| 101 | } |
| 102 | \f |
| 103 | /* Print the mips instruction at address MEMADDR in debugged memory, |
| 104 | on STREAM. Returns length of the instruction, in bytes, which |
| 105 | is always 4. */ |
| 106 | |
| 107 | int |
| 108 | print_insn (memaddr, stream) |
| 109 | CORE_ADDR memaddr; |
| 110 | FILE *stream; |
| 111 | { |
| 112 | unsigned char buffer[MAXLEN]; |
| 113 | register int i; |
| 114 | register char *d; |
| 115 | unsigned long int l; |
| 116 | |
| 117 | read_memory (memaddr, buffer, MAXLEN); |
| 118 | SWAP_TARGET_AND_HOST (buffer, MAXLEN); |
| 119 | |
| 120 | for (i = 0; i < NOPCODES; i++) |
| 121 | { |
| 122 | register unsigned int opcode = mips_opcodes[i].opcode; |
| 123 | register unsigned int match = mips_opcodes[i].match; |
| 124 | if ((*(unsigned int*)buffer & match) == opcode) |
| 125 | break; |
| 126 | } |
| 127 | |
| 128 | l = MKLONG (buffer); |
| 129 | /* Handle undefined instructions. */ |
| 130 | if (i == NOPCODES) |
| 131 | { |
| 132 | fprintf (stream, "0x%x",l); |
| 133 | return 4; |
| 134 | } |
| 135 | |
| 136 | fprintf (stream, "%s", mips_opcodes[i].name); |
| 137 | |
| 138 | if (!(d = mips_opcodes[i].args)) |
| 139 | return 4; |
| 140 | |
| 141 | fputc (' ', stream); |
| 142 | |
| 143 | while (*d) |
| 144 | print_insn_arg (d++, &l, stream, memaddr); |
| 145 | |
| 146 | return 4; |
| 147 | } |