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7d9884b9 JG |
1 | /* Print Acorn Risc Machine instructions for GDB, the GNU debugger. |
2 | Copyright 1986, 1989, 1991 Free Software Foundation, Inc. | |
dd3b648e RP |
3 | |
4 | This file is part of GDB. | |
5 | ||
99a7de40 | 6 | This program is free software; you can redistribute it and/or modify |
dd3b648e | 7 | it under the terms of the GNU General Public License as published by |
99a7de40 JG |
8 | the Free Software Foundation; either version 2 of the License, or |
9 | (at your option) any later version. | |
dd3b648e | 10 | |
99a7de40 | 11 | This program is distributed in the hope that it will be useful, |
dd3b648e RP |
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 | |
99a7de40 JG |
17 | along with this program; if not, write to the Free Software |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
dd3b648e | 19 | |
d747e0af | 20 | #include "defs.h" |
dd3b648e RP |
21 | #include <ctype.h> |
22 | #include <assert.h> | |
23 | ||
dd3b648e | 24 | #include "symtab.h" |
aab77d5f | 25 | #include "opcode/arm.h" |
dd3b648e RP |
26 | |
27 | extern char *reg_names[]; | |
28 | ||
29 | static char *shift_names[] = { | |
30 | "lsl", "lsr", "asr", "ror", | |
31 | }; | |
32 | ||
33 | static char *cond_names[] = { | |
34 | "eq", "ne", "cs", "cc", "mi", "pl", "vs", "vc", | |
35 | "hi", "ls", "ge", "lt", "gt", "le", "", "nv" | |
36 | }; | |
37 | ||
38 | static char float_precision[] = "sdep"; | |
39 | static char float_rounding[] = " pmz"; | |
40 | static float float_immed[] = { 0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 0.5, 10.0 }; | |
41 | ||
42 | static void print_ldr_str_offset(); | |
43 | static void print_ldc_stc_offset(); | |
44 | static long immediate_value(); | |
45 | \f | |
46 | /* Print the ARM instruction at address MEMADDR in debugged memory, | |
47 | on STREAM. Returns length of the instruction, in bytes. */ | |
48 | ||
49 | int | |
50 | print_insn (memaddr, stream) | |
51 | CORE_ADDR memaddr; | |
52 | FILE *stream; | |
53 | { | |
54 | unsigned long ins; | |
55 | register struct opcode *op; | |
56 | register char *p; | |
57 | register int i, c; | |
58 | int s, e, val; | |
59 | ||
60 | ins = read_memory_integer(memaddr, 4); | |
61 | for (i = 0, op = opcodes; i < N_OPCODES; i++, op++) | |
62 | if ((ins & op->mask) == op->value) break; | |
63 | assert(i != N_OPCODES); | |
64 | ||
65 | for (p = op->assembler; *p;) { | |
66 | c = *p++; | |
67 | if (c == '%') { | |
68 | s = e = 0; | |
69 | while (isdigit(*p)) | |
70 | s = s*10 + (*p++ - '0'); | |
71 | if (*p == '-') { | |
72 | p++; | |
73 | while (isdigit(*p)) | |
74 | e = e*10 + (*p++ - '0'); | |
75 | } else | |
76 | e = s; | |
77 | assert(s >= 0 && s <= 31 && e >= 0 && e <= 31); | |
78 | val = (ins >> s) & ((1 << (e + 1 - s)) - 1); | |
79 | switch (*p++) { | |
80 | case '%' : | |
81 | putc('%', stream); | |
82 | break; | |
83 | case 'd' : | |
84 | fprintf(stream, "%d", val); | |
85 | break; | |
86 | case 'x' : | |
87 | fprintf(stream, "%x", val); | |
88 | break; | |
89 | case 'r' : | |
90 | assert(val >= 0 && val <= 15); | |
91 | fprintf(stream, "%s", reg_names[val]); | |
92 | break; | |
93 | case 'c' : | |
94 | fprintf(stream, "%s", cond_names[ins >> 28]); | |
95 | break; | |
96 | case '\'' : | |
97 | assert(*p); | |
98 | c = *p++; | |
99 | if (val) | |
100 | putc(c, stream); | |
101 | break; | |
102 | case '`' : | |
103 | assert(*p); | |
104 | c = *p++; | |
105 | if (!val) | |
106 | putc(c, stream); | |
107 | break; | |
108 | case '?' : | |
109 | assert(*p); | |
110 | c = *p++; | |
111 | assert(*p); | |
112 | if (val) | |
113 | p++; | |
114 | else | |
115 | c = *p++; | |
116 | putc(c, stream); | |
117 | break; | |
118 | case 'p' : | |
119 | if (((ins >> 12) & 0xf) == 0xf) | |
120 | putc('p', stream); | |
121 | break; | |
122 | case 'o' : | |
123 | if (ins & (1<<25)) { | |
124 | int immed = immediate_value(ins & 0xfff); | |
125 | fprintf (stream, "#%d (0x%x)", immed, immed); | |
126 | } else { | |
127 | int operand2 = ins & 0xfff; | |
128 | /* in operand2 : | |
129 | bits 0-3 are the base register | |
130 | bits 5-6 are the shift (0=lsl, 1=lsr, 2=asr, 3=ror) | |
131 | if bit 4 is zero then bits 7-11 are an immediate shift count | |
132 | else bit 7 must be zero and bits 8-11 are the register | |
133 | to be used as a shift count. | |
134 | Note: no shift at all is encoded as "reg lsl #0" */ | |
135 | fprintf (stream, "%s", reg_names[operand2 & 0xf]); | |
136 | if (operand2 & 0xff0) { | |
137 | /* ror #0 is really rrx (rotate right extend) */ | |
138 | if ((operand2 & 0xff0) == 0x060) | |
139 | fprintf (stream, ", rrx"); | |
140 | else { | |
141 | fprintf (stream, ", %s ", | |
142 | shift_names[(operand2 >> 5) & 3]); | |
143 | if (operand2 & (1<<4)) /* register shift */ | |
144 | fprintf (stream, "%s", | |
145 | reg_names[operand2 >> 8]); | |
146 | else /* immediate shift */ | |
147 | fprintf (stream, "#%d", | |
148 | operand2 >> 7); | |
149 | } | |
150 | } | |
151 | } | |
152 | break; | |
153 | case 'a' : | |
154 | fprintf (stream, "[%s", reg_names[(ins >> 16) & 0xf]); | |
155 | if (ins & (1<<24)) { | |
156 | fprintf (stream, ", "); | |
157 | print_ldr_str_offset (ins, stream); | |
158 | putc (']', stream); | |
159 | if (ins & (1<<21)) putc('!', stream); | |
160 | /* If it is a pc relative load, then it is probably | |
161 | a constant so print it */ | |
162 | if (((ins >> 16) & 0xf) == 15 && | |
163 | (ins & (1<<25)) == 0 && | |
164 | (ins & (1<<20))) { | |
165 | int addr = memaddr + 8 + | |
166 | (ins & 0xfff) * ((ins & (1<<23)) ? 1 : -1); | |
167 | fprintf (stream, " (contents="); | |
168 | print_address (read_memory_integer(addr, 4), stream); | |
169 | fprintf (stream, ")"); | |
170 | } | |
171 | } else { | |
172 | fprintf (stream, "]," ); | |
173 | print_ldr_str_offset (ins, stream); | |
174 | } | |
175 | break; | |
176 | case 'b' : | |
177 | print_address (memaddr + 8 + (((int)ins << 8) >> 6), stream); | |
178 | break; | |
179 | case 'A' : | |
180 | fprintf (stream, "[%s", reg_names[(ins >> 16) & 0xf]); | |
181 | if (ins & (1<<24)) { | |
182 | fprintf (stream, ", "); | |
183 | print_ldc_stc_offset (ins, stream); | |
184 | putc(']', stream); | |
185 | if (ins & (1<<21)) | |
186 | putc('!', stream); | |
187 | } else { | |
188 | fprintf (stream, "], "); | |
189 | print_ldc_stc_offset (ins, stream); | |
190 | } | |
191 | break; | |
192 | case 'm' : | |
193 | { | |
194 | int regnum, first = 1; | |
195 | putc('{', stream); | |
196 | for (regnum = 0; regnum < 16; regnum++) | |
197 | if (ins & (1<<regnum)) { | |
198 | if (!first) | |
199 | putc (',', stream); | |
200 | first = 0; | |
201 | fprintf (stream, "%s", reg_names[regnum]); | |
202 | } | |
203 | putc('}', stream); | |
204 | } | |
205 | break; | |
206 | case 'P' : | |
207 | val = ((ins >> 18) & 2) | ((ins >> 7) & 1); | |
208 | putc(float_precision[val], stream); | |
209 | break; | |
210 | case 'Q' : | |
211 | val = ((ins >> 21) & 2) | ((ins >> 15) & 1); | |
212 | putc(float_precision[val], stream); | |
213 | break; | |
214 | case 'R' : | |
215 | val = ((ins >> 5) & 3); | |
216 | if (val) putc(float_rounding[val], stream); | |
217 | break; | |
218 | case 'f' : | |
219 | assert(val >= 0 && val <= 15); | |
220 | if (val > 7) | |
221 | fprintf (stream, "#%3.1f", float_immed[val - 8]); | |
222 | else | |
223 | fprintf (stream, "f%d", val); | |
224 | break; | |
225 | default: | |
226 | abort(); | |
227 | } | |
228 | } else | |
229 | putc(c, stream); | |
230 | } | |
231 | return 4; | |
232 | } | |
233 | ||
234 | static long | |
235 | immediate_value(operand) | |
236 | int operand; | |
237 | { | |
238 | int val = operand & 0xff; | |
239 | int shift = 2*(operand >> 8); | |
240 | /* immediate value is (val ror shift) */ | |
241 | return (val >> shift) | (val << (32 - shift)); | |
242 | } | |
243 | ||
244 | static void | |
245 | print_ldr_str_offset(ins, stream) | |
246 | unsigned long ins; | |
247 | FILE *stream; | |
248 | { | |
249 | if ((ins & (1<<25)) == 0) | |
250 | fprintf (stream, "#%d", | |
251 | (ins & 0xfff) * ((ins & (1<<23)) ? 1 : -1)); | |
252 | else { | |
253 | fprintf (stream, "%s%s", reg_names[ins & 0xf], | |
254 | (ins & (1<<23)) ? "" : "-"); | |
255 | if (ins & 0xff0) | |
256 | fprintf (stream, ", %s #%d", | |
257 | shift_names[(ins >> 5) & 3], | |
258 | (ins >> 7) & 0x1f); | |
259 | } | |
260 | } | |
261 | ||
262 | static void | |
263 | print_ldc_stc_offset(ins, stream) | |
264 | unsigned long ins; | |
265 | FILE *stream; | |
266 | { | |
267 | fprintf (stream, "#%d", | |
268 | 4 * (ins & 0xff) * ((ins & (1<<23)) ? 1 : -1)); | |
269 | } |