| 1 | /* Print Acorn Risc Machine 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 <ctype.h> |
| 22 | #include <assert.h> |
| 23 | |
| 24 | #include "symtab.h" |
| 25 | #include "opcode/arm.h" |
| 26 | |
| 27 | static char *shift_names[] = { |
| 28 | "lsl", "lsr", "asr", "ror", |
| 29 | }; |
| 30 | |
| 31 | static char *cond_names[] = { |
| 32 | "eq", "ne", "cs", "cc", "mi", "pl", "vs", "vc", |
| 33 | "hi", "ls", "ge", "lt", "gt", "le", "", "nv" |
| 34 | }; |
| 35 | |
| 36 | static char float_precision[] = "sdep"; |
| 37 | static char float_rounding[] = " pmz"; |
| 38 | static float float_immed[] = { 0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 0.5, 10.0 }; |
| 39 | |
| 40 | static void print_ldr_str_offset(); |
| 41 | static void print_ldc_stc_offset(); |
| 42 | static long immediate_value(); |
| 43 | \f |
| 44 | /* Print the ARM instruction at address MEMADDR in debugged memory, |
| 45 | on STREAM. Returns length of the instruction, in bytes. */ |
| 46 | |
| 47 | int |
| 48 | print_insn (memaddr, stream) |
| 49 | CORE_ADDR memaddr; |
| 50 | FILE *stream; |
| 51 | { |
| 52 | unsigned long ins; |
| 53 | register struct opcode *op; |
| 54 | register char *p; |
| 55 | register int i, c; |
| 56 | int s, e, val; |
| 57 | |
| 58 | ins = read_memory_integer(memaddr, 4); |
| 59 | for (i = 0, op = opcodes; i < N_OPCODES; i++, op++) |
| 60 | if ((ins & op->mask) == op->value) break; |
| 61 | assert(i != N_OPCODES); |
| 62 | |
| 63 | for (p = op->assembler; *p;) { |
| 64 | c = *p++; |
| 65 | if (c == '%') { |
| 66 | s = e = 0; |
| 67 | while (isdigit(*p)) |
| 68 | s = s*10 + (*p++ - '0'); |
| 69 | if (*p == '-') { |
| 70 | p++; |
| 71 | while (isdigit(*p)) |
| 72 | e = e*10 + (*p++ - '0'); |
| 73 | } else |
| 74 | e = s; |
| 75 | assert(s >= 0 && s <= 31 && e >= 0 && e <= 31); |
| 76 | val = (ins >> s) & ((1 << (e + 1 - s)) - 1); |
| 77 | switch (*p++) { |
| 78 | case '%' : |
| 79 | putc('%', stream); |
| 80 | break; |
| 81 | case 'd' : |
| 82 | fprintf(stream, "%d", val); |
| 83 | break; |
| 84 | case 'x' : |
| 85 | fprintf(stream, "%x", val); |
| 86 | break; |
| 87 | case 'r' : |
| 88 | assert(val >= 0 && val <= 15); |
| 89 | fprintf(stream, "%s", reg_names[val]); |
| 90 | break; |
| 91 | case 'c' : |
| 92 | fprintf(stream, "%s", cond_names[ins >> 28]); |
| 93 | break; |
| 94 | case '\'' : |
| 95 | assert(*p); |
| 96 | c = *p++; |
| 97 | if (val) |
| 98 | putc(c, stream); |
| 99 | break; |
| 100 | case '`' : |
| 101 | assert(*p); |
| 102 | c = *p++; |
| 103 | if (!val) |
| 104 | putc(c, stream); |
| 105 | break; |
| 106 | case '?' : |
| 107 | assert(*p); |
| 108 | c = *p++; |
| 109 | assert(*p); |
| 110 | if (val) |
| 111 | p++; |
| 112 | else |
| 113 | c = *p++; |
| 114 | putc(c, stream); |
| 115 | break; |
| 116 | case 'p' : |
| 117 | if (((ins >> 12) & 0xf) == 0xf) |
| 118 | putc('p', stream); |
| 119 | break; |
| 120 | case 'o' : |
| 121 | if (ins & (1<<25)) { |
| 122 | int immed = immediate_value(ins & 0xfff); |
| 123 | fprintf (stream, "#%d (0x%x)", immed, immed); |
| 124 | } else { |
| 125 | int operand2 = ins & 0xfff; |
| 126 | /* in operand2 : |
| 127 | bits 0-3 are the base register |
| 128 | bits 5-6 are the shift (0=lsl, 1=lsr, 2=asr, 3=ror) |
| 129 | if bit 4 is zero then bits 7-11 are an immediate shift count |
| 130 | else bit 7 must be zero and bits 8-11 are the register |
| 131 | to be used as a shift count. |
| 132 | Note: no shift at all is encoded as "reg lsl #0" */ |
| 133 | fprintf (stream, "%s", reg_names[operand2 & 0xf]); |
| 134 | if (operand2 & 0xff0) { |
| 135 | /* ror #0 is really rrx (rotate right extend) */ |
| 136 | if ((operand2 & 0xff0) == 0x060) |
| 137 | fprintf (stream, ", rrx"); |
| 138 | else { |
| 139 | fprintf (stream, ", %s ", |
| 140 | shift_names[(operand2 >> 5) & 3]); |
| 141 | if (operand2 & (1<<4)) /* register shift */ |
| 142 | fprintf (stream, "%s", |
| 143 | reg_names[operand2 >> 8]); |
| 144 | else /* immediate shift */ |
| 145 | fprintf (stream, "#%d", |
| 146 | operand2 >> 7); |
| 147 | } |
| 148 | } |
| 149 | } |
| 150 | break; |
| 151 | case 'a' : |
| 152 | fprintf (stream, "[%s", reg_names[(ins >> 16) & 0xf]); |
| 153 | if (ins & (1<<24)) { |
| 154 | fprintf (stream, ", "); |
| 155 | print_ldr_str_offset (ins, stream); |
| 156 | putc (']', stream); |
| 157 | if (ins & (1<<21)) putc('!', stream); |
| 158 | /* If it is a pc relative load, then it is probably |
| 159 | a constant so print it */ |
| 160 | if (((ins >> 16) & 0xf) == 15 && |
| 161 | (ins & (1<<25)) == 0 && |
| 162 | (ins & (1<<20))) { |
| 163 | int addr = memaddr + 8 + |
| 164 | (ins & 0xfff) * ((ins & (1<<23)) ? 1 : -1); |
| 165 | fprintf (stream, " (contents="); |
| 166 | print_address (read_memory_integer(addr, 4), stream); |
| 167 | fprintf (stream, ")"); |
| 168 | } |
| 169 | } else { |
| 170 | fprintf (stream, "]," ); |
| 171 | print_ldr_str_offset (ins, stream); |
| 172 | } |
| 173 | break; |
| 174 | case 'b' : |
| 175 | print_address (memaddr + 8 + (((int)ins << 8) >> 6), stream); |
| 176 | break; |
| 177 | case 'A' : |
| 178 | fprintf (stream, "[%s", reg_names[(ins >> 16) & 0xf]); |
| 179 | if (ins & (1<<24)) { |
| 180 | fprintf (stream, ", "); |
| 181 | print_ldc_stc_offset (ins, stream); |
| 182 | putc(']', stream); |
| 183 | if (ins & (1<<21)) |
| 184 | putc('!', stream); |
| 185 | } else { |
| 186 | fprintf (stream, "], "); |
| 187 | print_ldc_stc_offset (ins, stream); |
| 188 | } |
| 189 | break; |
| 190 | case 'm' : |
| 191 | { |
| 192 | int regnum, first = 1; |
| 193 | putc('{', stream); |
| 194 | for (regnum = 0; regnum < 16; regnum++) |
| 195 | if (ins & (1<<regnum)) { |
| 196 | if (!first) |
| 197 | putc (',', stream); |
| 198 | first = 0; |
| 199 | fprintf (stream, "%s", reg_names[regnum]); |
| 200 | } |
| 201 | putc('}', stream); |
| 202 | } |
| 203 | break; |
| 204 | case 'P' : |
| 205 | val = ((ins >> 18) & 2) | ((ins >> 7) & 1); |
| 206 | putc(float_precision[val], stream); |
| 207 | break; |
| 208 | case 'Q' : |
| 209 | val = ((ins >> 21) & 2) | ((ins >> 15) & 1); |
| 210 | putc(float_precision[val], stream); |
| 211 | break; |
| 212 | case 'R' : |
| 213 | val = ((ins >> 5) & 3); |
| 214 | if (val) putc(float_rounding[val], stream); |
| 215 | break; |
| 216 | case 'f' : |
| 217 | assert(val >= 0 && val <= 15); |
| 218 | if (val > 7) |
| 219 | fprintf (stream, "#%3.1f", float_immed[val - 8]); |
| 220 | else |
| 221 | fprintf (stream, "f%d", val); |
| 222 | break; |
| 223 | default: |
| 224 | abort(); |
| 225 | } |
| 226 | } else |
| 227 | putc(c, stream); |
| 228 | } |
| 229 | return 4; |
| 230 | } |
| 231 | |
| 232 | static long |
| 233 | immediate_value(operand) |
| 234 | int operand; |
| 235 | { |
| 236 | int val = operand & 0xff; |
| 237 | int shift = 2*(operand >> 8); |
| 238 | /* immediate value is (val ror shift) */ |
| 239 | return (val >> shift) | (val << (32 - shift)); |
| 240 | } |
| 241 | |
| 242 | static void |
| 243 | print_ldr_str_offset(ins, stream) |
| 244 | unsigned long ins; |
| 245 | FILE *stream; |
| 246 | { |
| 247 | if ((ins & (1<<25)) == 0) |
| 248 | fprintf (stream, "#%d", |
| 249 | (ins & 0xfff) * ((ins & (1<<23)) ? 1 : -1)); |
| 250 | else { |
| 251 | fprintf (stream, "%s%s", reg_names[ins & 0xf], |
| 252 | (ins & (1<<23)) ? "" : "-"); |
| 253 | if (ins & 0xff0) |
| 254 | fprintf (stream, ", %s #%d", |
| 255 | shift_names[(ins >> 5) & 3], |
| 256 | (ins >> 7) & 0x1f); |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | static void |
| 261 | print_ldc_stc_offset(ins, stream) |
| 262 | unsigned long ins; |
| 263 | FILE *stream; |
| 264 | { |
| 265 | fprintf (stream, "#%d", |
| 266 | 4 * (ins & 0xff) * ((ins & (1<<23)) ? 1 : -1)); |
| 267 | } |