| 1 | /* Print VAX instructions for GDB, the GNU debugger. |
| 2 | Copyright 1986, 1989, 1991, 1992 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program 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 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program 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. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "symtab.h" |
| 22 | #include "opcode/vax.h" |
| 23 | |
| 24 | /* Vax instructions are never longer than this. */ |
| 25 | #define MAXLEN 62 |
| 26 | |
| 27 | /* Number of elements in the opcode table. */ |
| 28 | #define NOPCODES (sizeof votstrs / sizeof votstrs[0]) |
| 29 | |
| 30 | static unsigned char *print_insn_arg (); |
| 31 | \f |
| 32 | /* Print the vax instruction at address MEMADDR in debugged memory, |
| 33 | on STREAM. Returns length of the instruction, in bytes. */ |
| 34 | |
| 35 | int |
| 36 | print_insn (memaddr, stream) |
| 37 | CORE_ADDR memaddr; |
| 38 | GDB_FILE *stream; |
| 39 | { |
| 40 | unsigned char buffer[MAXLEN]; |
| 41 | register int i; |
| 42 | register unsigned char *p; |
| 43 | register char *d; |
| 44 | |
| 45 | read_memory (memaddr, buffer, MAXLEN); |
| 46 | |
| 47 | for (i = 0; i < NOPCODES; i++) |
| 48 | if (votstrs[i].detail.code == buffer[0] |
| 49 | || votstrs[i].detail.code == *(unsigned short *)buffer) |
| 50 | break; |
| 51 | |
| 52 | /* Handle undefined instructions. */ |
| 53 | if (i == NOPCODES) |
| 54 | { |
| 55 | fprintf_unfiltered (stream, "0%o", buffer[0]); |
| 56 | return 1; |
| 57 | } |
| 58 | |
| 59 | fprintf_unfiltered (stream, "%s", votstrs[i].name); |
| 60 | |
| 61 | /* Point at first byte of argument data, |
| 62 | and at descriptor for first argument. */ |
| 63 | p = buffer + 1 + (votstrs[i].detail.code >= 0x100); |
| 64 | d = votstrs[i].detail.args; |
| 65 | |
| 66 | if (*d) |
| 67 | fputc_unfiltered (' ', stream); |
| 68 | |
| 69 | while (*d) |
| 70 | { |
| 71 | p = print_insn_arg (d, p, memaddr + (p - buffer), stream); |
| 72 | d += 2; |
| 73 | if (*d) |
| 74 | fprintf_unfiltered (stream, ","); |
| 75 | } |
| 76 | return p - buffer; |
| 77 | } |
| 78 | |
| 79 | static unsigned char * |
| 80 | print_insn_arg (d, p, addr, stream) |
| 81 | char *d; |
| 82 | register char *p; |
| 83 | CORE_ADDR addr; |
| 84 | GDB_FILE *stream; |
| 85 | { |
| 86 | register int regnum = *p & 0xf; |
| 87 | float floatlitbuf; |
| 88 | |
| 89 | if (*d == 'b') |
| 90 | { |
| 91 | if (d[1] == 'b') |
| 92 | fprintf_unfiltered (stream, "0x%x", addr + *p++ + 1); |
| 93 | else |
| 94 | { |
| 95 | fprintf_unfiltered (stream, "0x%x", addr + *(short *)p + 2); |
| 96 | p += 2; |
| 97 | } |
| 98 | } |
| 99 | else |
| 100 | switch ((*p++ >> 4) & 0xf) |
| 101 | { |
| 102 | case 0: |
| 103 | case 1: |
| 104 | case 2: |
| 105 | case 3: /* Literal mode */ |
| 106 | if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h') |
| 107 | { |
| 108 | *(int *)&floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4); |
| 109 | fprintf_unfiltered (stream, "$%f", floatlitbuf); |
| 110 | } |
| 111 | else |
| 112 | fprintf_unfiltered (stream, "$%d", p[-1] & 0x3f); |
| 113 | break; |
| 114 | |
| 115 | case 4: /* Indexed */ |
| 116 | p = (char *) print_insn_arg (d, p, addr + 1, stream); |
| 117 | fprintf_unfiltered (stream, "[%s]", reg_names[regnum]); |
| 118 | break; |
| 119 | |
| 120 | case 5: /* Register */ |
| 121 | fprintf_unfiltered (stream, reg_names[regnum]); |
| 122 | break; |
| 123 | |
| 124 | case 7: /* Autodecrement */ |
| 125 | fputc_unfiltered ('-', stream); |
| 126 | case 6: /* Register deferred */ |
| 127 | fprintf_unfiltered (stream, "(%s)", reg_names[regnum]); |
| 128 | break; |
| 129 | |
| 130 | case 9: /* Autoincrement deferred */ |
| 131 | fputc_unfiltered ('@', stream); |
| 132 | if (regnum == PC_REGNUM) |
| 133 | { |
| 134 | fputc_unfiltered ('#', stream); |
| 135 | print_address (*(long *)p, stream); |
| 136 | p += 4; |
| 137 | break; |
| 138 | } |
| 139 | case 8: /* Autoincrement */ |
| 140 | if (regnum == PC_REGNUM) |
| 141 | { |
| 142 | fputc_unfiltered ('#', stream); |
| 143 | switch (d[1]) |
| 144 | { |
| 145 | case 'b': |
| 146 | fprintf_unfiltered (stream, "%d", *p++); |
| 147 | break; |
| 148 | |
| 149 | case 'w': |
| 150 | fprintf_unfiltered (stream, "%d", *(short *)p); |
| 151 | p += 2; |
| 152 | break; |
| 153 | |
| 154 | case 'l': |
| 155 | fprintf_unfiltered (stream, "%d", *(long *)p); |
| 156 | p += 4; |
| 157 | break; |
| 158 | |
| 159 | case 'q': |
| 160 | fprintf_unfiltered (stream, "0x%x%08x", ((long *)p)[1], ((long *)p)[0]); |
| 161 | p += 8; |
| 162 | break; |
| 163 | |
| 164 | case 'o': |
| 165 | fprintf_unfiltered (stream, "0x%x%08x%08x%08x", |
| 166 | ((long *)p)[3], ((long *)p)[2], |
| 167 | ((long *)p)[1], ((long *)p)[0]); |
| 168 | p += 16; |
| 169 | break; |
| 170 | |
| 171 | case 'f': |
| 172 | if (INVALID_FLOAT (p, 4)) |
| 173 | fprintf_unfiltered (stream, "<<invalid float 0x%x>>", *(int *) p); |
| 174 | else |
| 175 | fprintf_unfiltered (stream, "%f", *(float *) p); |
| 176 | p += 4; |
| 177 | break; |
| 178 | |
| 179 | case 'd': |
| 180 | if (INVALID_FLOAT (p, 8)) |
| 181 | fprintf_unfiltered (stream, "<<invalid float 0x%x%08x>>", |
| 182 | ((long *)p)[1], ((long *)p)[0]); |
| 183 | else |
| 184 | fprintf_unfiltered (stream, "%f", *(double *) p); |
| 185 | p += 8; |
| 186 | break; |
| 187 | |
| 188 | case 'g': |
| 189 | fprintf_unfiltered (stream, "g-float"); |
| 190 | p += 8; |
| 191 | break; |
| 192 | |
| 193 | case 'h': |
| 194 | fprintf_unfiltered (stream, "h-float"); |
| 195 | p += 16; |
| 196 | break; |
| 197 | |
| 198 | } |
| 199 | } |
| 200 | else |
| 201 | fprintf_unfiltered (stream, "(%s)+", reg_names[regnum]); |
| 202 | break; |
| 203 | |
| 204 | case 11: /* Byte displacement deferred */ |
| 205 | fputc_unfiltered ('@', stream); |
| 206 | case 10: /* Byte displacement */ |
| 207 | if (regnum == PC_REGNUM) |
| 208 | print_address (addr + *p + 2, stream); |
| 209 | else |
| 210 | fprintf_unfiltered (stream, "%d(%s)", *p, reg_names[regnum]); |
| 211 | p += 1; |
| 212 | break; |
| 213 | |
| 214 | case 13: /* Word displacement deferred */ |
| 215 | fputc_unfiltered ('@', stream); |
| 216 | case 12: /* Word displacement */ |
| 217 | if (regnum == PC_REGNUM) |
| 218 | print_address (addr + *(short *)p + 3, stream); |
| 219 | else |
| 220 | fprintf_unfiltered (stream, "%d(%s)", *(short *)p, reg_names[regnum]); |
| 221 | p += 2; |
| 222 | break; |
| 223 | |
| 224 | case 15: /* Long displacement deferred */ |
| 225 | fputc_unfiltered ('@', stream); |
| 226 | case 14: /* Long displacement */ |
| 227 | if (regnum == PC_REGNUM) |
| 228 | print_address (addr + *(long *)p + 5, stream); |
| 229 | else |
| 230 | fprintf_unfiltered (stream, "%d(%s)", *(long *)p, reg_names[regnum]); |
| 231 | p += 4; |
| 232 | } |
| 233 | |
| 234 | return (unsigned char *) p; |
| 235 | } |