FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/disassem.c
1 /* $NetBSD: disassem.c,v 1.14 2003/03/27 16:58:36 mycroft Exp $ */
2
3 /*-
4 * Copyright (c) 1996 Mark Brinicombe.
5 * Copyright (c) 1996 Brini.
6 *
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by Brini.
20 * 4. The name of the company nor the name of the author may be used to
21 * endorse or promote products derived from this software without specific
22 * prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
28 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
29 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
30 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * RiscBSD kernel project
37 *
38 * db_disasm.c
39 *
40 * Kernel disassembler
41 *
42 * Created : 10/02/96
43 *
44 * Structured after the sparc/sparc/db_disasm.c by David S. Miller &
45 * Paul Kranenburg
46 *
47 * This code is not complete. Not all instructions are disassembled.
48 */
49
50 #include <sys/cdefs.h>
51 __FBSDID("$FreeBSD: releng/10.0/sys/arm/arm/disassem.c 248119 2013-03-09 23:55:23Z andrew $");
52 #include <sys/param.h>
53
54
55 #include <sys/systm.h>
56 #include <machine/disassem.h>
57 #include <machine/armreg.h>
58 #include <ddb/ddb.h>
59
60 /*
61 * General instruction format
62 *
63 * insn[cc][mod] [operands]
64 *
65 * Those fields with an uppercase format code indicate that the field
66 * follows directly after the instruction before the separator i.e.
67 * they modify the instruction rather than just being an operand to
68 * the instruction. The only exception is the writeback flag which
69 * follows a operand.
70 *
71 *
72 * 2 - print Operand 2 of a data processing instruction
73 * d - destination register (bits 12-15)
74 * n - n register (bits 16-19)
75 * s - s register (bits 8-11)
76 * o - indirect register rn (bits 16-19) (used by swap)
77 * m - m register (bits 0-3)
78 * a - address operand of ldr/str instruction
79 * l - register list for ldm/stm instruction
80 * f - 1st fp operand (register) (bits 12-14)
81 * g - 2nd fp operand (register) (bits 16-18)
82 * h - 3rd fp operand (register/immediate) (bits 0-4)
83 * b - branch address
84 * t - thumb branch address (bits 24, 0-23)
85 * k - breakpoint comment (bits 0-3, 8-19)
86 * X - block transfer type
87 * Y - block transfer type (r13 base)
88 * c - comment field bits(0-23)
89 * p - saved or current status register
90 * F - PSR transfer fields
91 * D - destination-is-r15 (P) flag on TST, TEQ, CMP, CMN
92 * L - co-processor transfer size
93 * S - set status flag
94 * P - fp precision
95 * Q - fp precision (for ldf/stf)
96 * R - fp rounding
97 * v - co-processor data transfer registers + addressing mode
98 * W - writeback flag
99 * x - instruction in hex
100 * # - co-processor number
101 * y - co-processor data processing registers
102 * z - co-processor register transfer registers
103 */
104
105 struct arm32_insn {
106 u_int mask;
107 u_int pattern;
108 char* name;
109 char* format;
110 };
111
112 static const struct arm32_insn arm32_i[] = {
113 { 0x0fffffff, 0x0ff00000, "imb", "c" }, /* Before swi */
114 { 0x0fffffff, 0x0ff00001, "imbrange", "c" }, /* Before swi */
115 { 0x0f000000, 0x0f000000, "swi", "c" },
116 { 0xfe000000, 0xfa000000, "blx", "t" }, /* Before b and bl */
117 { 0x0f000000, 0x0a000000, "b", "b" },
118 { 0x0f000000, 0x0b000000, "bl", "b" },
119 { 0x0fe000f0, 0x00000090, "mul", "Snms" },
120 { 0x0fe000f0, 0x00200090, "mla", "Snmsd" },
121 { 0x0fe000f0, 0x00800090, "umull", "Sdnms" },
122 { 0x0fe000f0, 0x00c00090, "smull", "Sdnms" },
123 { 0x0fe000f0, 0x00a00090, "umlal", "Sdnms" },
124 { 0x0fe000f0, 0x00e00090, "smlal", "Sdnms" },
125 { 0x0d700000, 0x04200000, "strt", "daW" },
126 { 0x0d700000, 0x04300000, "ldrt", "daW" },
127 { 0x0d700000, 0x04600000, "strbt", "daW" },
128 { 0x0d700000, 0x04700000, "ldrbt", "daW" },
129 { 0x0c500000, 0x04000000, "str", "daW" },
130 { 0x0c500000, 0x04100000, "ldr", "daW" },
131 { 0x0c500000, 0x04400000, "strb", "daW" },
132 { 0x0c500000, 0x04500000, "ldrb", "daW" },
133 #if defined(__FreeBSD_ARCH_armv6__) || (defined(__ARM_ARCH) && __ARM_ARCH >= 6)
134 { 0xffffffff, 0xf57ff01f, "clrex", "c" },
135 { 0x0ff00ff0, 0x01800f90, "strex", "dmo" },
136 { 0x0ff00fff, 0x01900f9f, "ldrex", "do" },
137 { 0x0ff00ff0, 0x01a00f90, "strexd", "dmo" },
138 { 0x0ff00fff, 0x01b00f9f, "ldrexd", "do" },
139 { 0x0ff00ff0, 0x01c00f90, "strexb", "dmo" },
140 { 0x0ff00fff, 0x01d00f9f, "ldrexb", "do" },
141 { 0x0ff00ff0, 0x01e00f90, "strexh", "dmo" },
142 { 0x0ff00fff, 0x01f00f9f, "ldrexh", "do" },
143 #endif
144 { 0x0e1f0000, 0x080d0000, "stm", "YnWl" },/* separate out r13 base */
145 { 0x0e1f0000, 0x081d0000, "ldm", "YnWl" },/* separate out r13 base */
146 { 0x0e100000, 0x08000000, "stm", "XnWl" },
147 { 0x0e100000, 0x08100000, "ldm", "XnWl" },
148 { 0x0e1000f0, 0x00100090, "ldrb", "de" },
149 { 0x0e1000f0, 0x00000090, "strb", "de" },
150 { 0x0e1000f0, 0x001000d0, "ldrsb", "de" },
151 { 0x0e1000f0, 0x001000b0, "ldrh", "de" },
152 { 0x0e1000f0, 0x000000b0, "strh", "de" },
153 { 0x0e1000f0, 0x001000f0, "ldrsh", "de" },
154 { 0x0f200090, 0x00200090, "und", "x" }, /* Before data processing */
155 { 0x0e1000d0, 0x000000d0, "und", "x" }, /* Before data processing */
156 { 0x0ff00ff0, 0x01000090, "swp", "dmo" },
157 { 0x0ff00ff0, 0x01400090, "swpb", "dmo" },
158 { 0x0fbf0fff, 0x010f0000, "mrs", "dp" }, /* Before data processing */
159 { 0x0fb0fff0, 0x0120f000, "msr", "pFm" },/* Before data processing */
160 { 0x0fb0f000, 0x0320f000, "msr", "pF2" },/* Before data processing */
161 { 0x0ffffff0, 0x012fff10, "bx", "m" },
162 { 0x0fff0ff0, 0x016f0f10, "clz", "dm" },
163 { 0x0ffffff0, 0x012fff30, "blx", "m" },
164 { 0xfff000f0, 0xe1200070, "bkpt", "k" },
165 { 0x0de00000, 0x00000000, "and", "Sdn2" },
166 { 0x0de00000, 0x00200000, "eor", "Sdn2" },
167 { 0x0de00000, 0x00400000, "sub", "Sdn2" },
168 { 0x0de00000, 0x00600000, "rsb", "Sdn2" },
169 { 0x0de00000, 0x00800000, "add", "Sdn2" },
170 { 0x0de00000, 0x00a00000, "adc", "Sdn2" },
171 { 0x0de00000, 0x00c00000, "sbc", "Sdn2" },
172 { 0x0de00000, 0x00e00000, "rsc", "Sdn2" },
173 { 0x0df00000, 0x01100000, "tst", "Dn2" },
174 { 0x0df00000, 0x01300000, "teq", "Dn2" },
175 { 0x0de00000, 0x01400000, "cmp", "Dn2" },
176 { 0x0de00000, 0x01600000, "cmn", "Dn2" },
177 { 0x0de00000, 0x01800000, "orr", "Sdn2" },
178 { 0x0de00000, 0x01a00000, "mov", "Sd2" },
179 { 0x0de00000, 0x01c00000, "bic", "Sdn2" },
180 { 0x0de00000, 0x01e00000, "mvn", "Sd2" },
181 { 0x0ff08f10, 0x0e000100, "adf", "PRfgh" },
182 { 0x0ff08f10, 0x0e100100, "muf", "PRfgh" },
183 { 0x0ff08f10, 0x0e200100, "suf", "PRfgh" },
184 { 0x0ff08f10, 0x0e300100, "rsf", "PRfgh" },
185 { 0x0ff08f10, 0x0e400100, "dvf", "PRfgh" },
186 { 0x0ff08f10, 0x0e500100, "rdf", "PRfgh" },
187 { 0x0ff08f10, 0x0e600100, "pow", "PRfgh" },
188 { 0x0ff08f10, 0x0e700100, "rpw", "PRfgh" },
189 { 0x0ff08f10, 0x0e800100, "rmf", "PRfgh" },
190 { 0x0ff08f10, 0x0e900100, "fml", "PRfgh" },
191 { 0x0ff08f10, 0x0ea00100, "fdv", "PRfgh" },
192 { 0x0ff08f10, 0x0eb00100, "frd", "PRfgh" },
193 { 0x0ff08f10, 0x0ec00100, "pol", "PRfgh" },
194 { 0x0f008f10, 0x0e000100, "fpbop", "PRfgh" },
195 { 0x0ff08f10, 0x0e008100, "mvf", "PRfh" },
196 { 0x0ff08f10, 0x0e108100, "mnf", "PRfh" },
197 { 0x0ff08f10, 0x0e208100, "abs", "PRfh" },
198 { 0x0ff08f10, 0x0e308100, "rnd", "PRfh" },
199 { 0x0ff08f10, 0x0e408100, "sqt", "PRfh" },
200 { 0x0ff08f10, 0x0e508100, "log", "PRfh" },
201 { 0x0ff08f10, 0x0e608100, "lgn", "PRfh" },
202 { 0x0ff08f10, 0x0e708100, "exp", "PRfh" },
203 { 0x0ff08f10, 0x0e808100, "sin", "PRfh" },
204 { 0x0ff08f10, 0x0e908100, "cos", "PRfh" },
205 { 0x0ff08f10, 0x0ea08100, "tan", "PRfh" },
206 { 0x0ff08f10, 0x0eb08100, "asn", "PRfh" },
207 { 0x0ff08f10, 0x0ec08100, "acs", "PRfh" },
208 { 0x0ff08f10, 0x0ed08100, "atn", "PRfh" },
209 { 0x0f008f10, 0x0e008100, "fpuop", "PRfh" },
210 { 0x0e100f00, 0x0c000100, "stf", "QLv" },
211 { 0x0e100f00, 0x0c100100, "ldf", "QLv" },
212 { 0x0ff00f10, 0x0e000110, "flt", "PRgd" },
213 { 0x0ff00f10, 0x0e100110, "fix", "PRdh" },
214 { 0x0ff00f10, 0x0e200110, "wfs", "d" },
215 { 0x0ff00f10, 0x0e300110, "rfs", "d" },
216 { 0x0ff00f10, 0x0e400110, "wfc", "d" },
217 { 0x0ff00f10, 0x0e500110, "rfc", "d" },
218 { 0x0ff0ff10, 0x0e90f110, "cmf", "PRgh" },
219 { 0x0ff0ff10, 0x0eb0f110, "cnf", "PRgh" },
220 { 0x0ff0ff10, 0x0ed0f110, "cmfe", "PRgh" },
221 { 0x0ff0ff10, 0x0ef0f110, "cnfe", "PRgh" },
222 { 0xff100010, 0xfe000010, "mcr2", "#z" },
223 { 0x0f100010, 0x0e000010, "mcr", "#z" },
224 { 0xff100010, 0xfe100010, "mrc2", "#z" },
225 { 0x0f100010, 0x0e100010, "mrc", "#z" },
226 { 0xff000010, 0xfe000000, "cdp2", "#y" },
227 { 0x0f000010, 0x0e000000, "cdp", "#y" },
228 { 0xfe100090, 0xfc100000, "ldc2", "L#v" },
229 { 0x0e100090, 0x0c100000, "ldc", "L#v" },
230 { 0xfe100090, 0xfc000000, "stc2", "L#v" },
231 { 0x0e100090, 0x0c000000, "stc", "L#v" },
232 { 0x00000000, 0x00000000, NULL, NULL }
233 };
234
235 static char const arm32_insn_conditions[][4] = {
236 "eq", "ne", "cs", "cc",
237 "mi", "pl", "vs", "vc",
238 "hi", "ls", "ge", "lt",
239 "gt", "le", "", "nv"
240 };
241
242 static char const insn_block_transfers[][4] = {
243 "da", "ia", "db", "ib"
244 };
245
246 static char const insn_stack_block_transfers[][4] = {
247 "ed", "ea", "fd", "fa"
248 };
249
250 static char const op_shifts[][4] = {
251 "lsl", "lsr", "asr", "ror"
252 };
253
254 static char const insn_fpa_rounding[][2] = {
255 "", "p", "m", "z"
256 };
257
258 static char const insn_fpa_precision[][2] = {
259 "s", "d", "e", "p"
260 };
261
262 static char const insn_fpaconstants[][8] = {
263 "0.0", "1.0", "2.0", "3.0",
264 "4.0", "5.0", "0.5", "10.0"
265 };
266
267 #define insn_condition(x) arm32_insn_conditions[(x >> 28) & 0x0f]
268 #define insn_blktrans(x) insn_block_transfers[(x >> 23) & 3]
269 #define insn_stkblktrans(x) insn_stack_block_transfers[(x >> 23) & 3]
270 #define op2_shift(x) op_shifts[(x >> 5) & 3]
271 #define insn_fparnd(x) insn_fpa_rounding[(x >> 5) & 0x03]
272 #define insn_fpaprec(x) insn_fpa_precision[(((x >> 18) & 2)|(x >> 7)) & 1]
273 #define insn_fpaprect(x) insn_fpa_precision[(((x >> 21) & 2)|(x >> 15)) & 1]
274 #define insn_fpaimm(x) insn_fpaconstants[x & 0x07]
275
276 /* Local prototypes */
277 static void disasm_register_shift(const disasm_interface_t *di, u_int insn);
278 static void disasm_print_reglist(const disasm_interface_t *di, u_int insn);
279 static void disasm_insn_ldrstr(const disasm_interface_t *di, u_int insn,
280 u_int loc);
281 static void disasm_insn_ldrhstrh(const disasm_interface_t *di, u_int insn,
282 u_int loc);
283 static void disasm_insn_ldcstc(const disasm_interface_t *di, u_int insn,
284 u_int loc);
285 static u_int disassemble_readword(u_int address);
286 static void disassemble_printaddr(u_int address);
287
288 vm_offset_t
289 disasm(const disasm_interface_t *di, vm_offset_t loc, int altfmt)
290 {
291 struct arm32_insn *i_ptr = (struct arm32_insn *)&arm32_i;
292
293 u_int insn;
294 int matchp;
295 int branch;
296 char* f_ptr;
297 int fmt;
298
299 fmt = 0;
300 matchp = 0;
301 insn = di->di_readword(loc);
302
303 /* di->di_printf("loc=%08x insn=%08x : ", loc, insn);*/
304
305 while (i_ptr->name) {
306 if ((insn & i_ptr->mask) == i_ptr->pattern) {
307 matchp = 1;
308 break;
309 }
310 i_ptr++;
311 }
312
313 if (!matchp) {
314 di->di_printf("und%s\t%08x\n", insn_condition(insn), insn);
315 return(loc + INSN_SIZE);
316 }
317
318 /* If instruction forces condition code, don't print it. */
319 if ((i_ptr->mask & 0xf0000000) == 0xf0000000)
320 di->di_printf("%s", i_ptr->name);
321 else
322 di->di_printf("%s%s", i_ptr->name, insn_condition(insn));
323
324 f_ptr = i_ptr->format;
325
326 /* Insert tab if there are no instruction modifiers */
327
328 if (*(f_ptr) < 'A' || *(f_ptr) > 'Z') {
329 ++fmt;
330 di->di_printf("\t");
331 }
332
333 while (*f_ptr) {
334 switch (*f_ptr) {
335 /* 2 - print Operand 2 of a data processing instruction */
336 case '2':
337 if (insn & 0x02000000) {
338 int rotate= ((insn >> 7) & 0x1e);
339
340 di->di_printf("#0x%08x",
341 (insn & 0xff) << (32 - rotate) |
342 (insn & 0xff) >> rotate);
343 } else {
344 disasm_register_shift(di, insn);
345 }
346 break;
347 /* d - destination register (bits 12-15) */
348 case 'd':
349 di->di_printf("r%d", ((insn >> 12) & 0x0f));
350 break;
351 /* D - insert 'p' if Rd is R15 */
352 case 'D':
353 if (((insn >> 12) & 0x0f) == 15)
354 di->di_printf("p");
355 break;
356 /* n - n register (bits 16-19) */
357 case 'n':
358 di->di_printf("r%d", ((insn >> 16) & 0x0f));
359 break;
360 /* s - s register (bits 8-11) */
361 case 's':
362 di->di_printf("r%d", ((insn >> 8) & 0x0f));
363 break;
364 /* o - indirect register rn (bits 16-19) (used by swap) */
365 case 'o':
366 di->di_printf("[r%d]", ((insn >> 16) & 0x0f));
367 break;
368 /* m - m register (bits 0-4) */
369 case 'm':
370 di->di_printf("r%d", ((insn >> 0) & 0x0f));
371 break;
372 /* a - address operand of ldr/str instruction */
373 case 'a':
374 disasm_insn_ldrstr(di, insn, loc);
375 break;
376 /* e - address operand of ldrh/strh instruction */
377 case 'e':
378 disasm_insn_ldrhstrh(di, insn, loc);
379 break;
380 /* l - register list for ldm/stm instruction */
381 case 'l':
382 disasm_print_reglist(di, insn);
383 break;
384 /* f - 1st fp operand (register) (bits 12-14) */
385 case 'f':
386 di->di_printf("f%d", (insn >> 12) & 7);
387 break;
388 /* g - 2nd fp operand (register) (bits 16-18) */
389 case 'g':
390 di->di_printf("f%d", (insn >> 16) & 7);
391 break;
392 /* h - 3rd fp operand (register/immediate) (bits 0-4) */
393 case 'h':
394 if (insn & (1 << 3))
395 di->di_printf("#%s", insn_fpaimm(insn));
396 else
397 di->di_printf("f%d", insn & 7);
398 break;
399 /* b - branch address */
400 case 'b':
401 branch = ((insn << 2) & 0x03ffffff);
402 if (branch & 0x02000000)
403 branch |= 0xfc000000;
404 di->di_printaddr(loc + 8 + branch);
405 break;
406 /* t - blx address */
407 case 't':
408 branch = ((insn << 2) & 0x03ffffff) |
409 (insn >> 23 & 0x00000002);
410 if (branch & 0x02000000)
411 branch |= 0xfc000000;
412 di->di_printaddr(loc + 8 + branch);
413 break;
414 /* X - block transfer type */
415 case 'X':
416 di->di_printf("%s", insn_blktrans(insn));
417 break;
418 /* Y - block transfer type (r13 base) */
419 case 'Y':
420 di->di_printf("%s", insn_stkblktrans(insn));
421 break;
422 /* c - comment field bits(0-23) */
423 case 'c':
424 di->di_printf("0x%08x", (insn & 0x00ffffff));
425 break;
426 /* k - breakpoint comment (bits 0-3, 8-19) */
427 case 'k':
428 di->di_printf("0x%04x",
429 (insn & 0x000fff00) >> 4 | (insn & 0x0000000f));
430 break;
431 /* p - saved or current status register */
432 case 'p':
433 if (insn & 0x00400000)
434 di->di_printf("spsr");
435 else
436 di->di_printf("cpsr");
437 break;
438 /* F - PSR transfer fields */
439 case 'F':
440 di->di_printf("_");
441 if (insn & (1 << 16))
442 di->di_printf("c");
443 if (insn & (1 << 17))
444 di->di_printf("x");
445 if (insn & (1 << 18))
446 di->di_printf("s");
447 if (insn & (1 << 19))
448 di->di_printf("f");
449 break;
450 /* B - byte transfer flag */
451 case 'B':
452 if (insn & 0x00400000)
453 di->di_printf("b");
454 break;
455 /* L - co-processor transfer size */
456 case 'L':
457 if (insn & (1 << 22))
458 di->di_printf("l");
459 break;
460 /* S - set status flag */
461 case 'S':
462 if (insn & 0x00100000)
463 di->di_printf("s");
464 break;
465 /* P - fp precision */
466 case 'P':
467 di->di_printf("%s", insn_fpaprec(insn));
468 break;
469 /* Q - fp precision (for ldf/stf) */
470 case 'Q':
471 break;
472 /* R - fp rounding */
473 case 'R':
474 di->di_printf("%s", insn_fparnd(insn));
475 break;
476 /* W - writeback flag */
477 case 'W':
478 if (insn & (1 << 21))
479 di->di_printf("!");
480 break;
481 /* # - co-processor number */
482 case '#':
483 di->di_printf("p%d", (insn >> 8) & 0x0f);
484 break;
485 /* v - co-processor data transfer registers+addressing mode */
486 case 'v':
487 disasm_insn_ldcstc(di, insn, loc);
488 break;
489 /* x - instruction in hex */
490 case 'x':
491 di->di_printf("0x%08x", insn);
492 break;
493 /* y - co-processor data processing registers */
494 case 'y':
495 di->di_printf("%d, ", (insn >> 20) & 0x0f);
496
497 di->di_printf("c%d, c%d, c%d", (insn >> 12) & 0x0f,
498 (insn >> 16) & 0x0f, insn & 0x0f);
499
500 di->di_printf(", %d", (insn >> 5) & 0x07);
501 break;
502 /* z - co-processor register transfer registers */
503 case 'z':
504 di->di_printf("%d, ", (insn >> 21) & 0x07);
505 di->di_printf("r%d, c%d, c%d, %d",
506 (insn >> 12) & 0x0f, (insn >> 16) & 0x0f,
507 insn & 0x0f, (insn >> 5) & 0x07);
508
509 /* if (((insn >> 5) & 0x07) != 0)
510 di->di_printf(", %d", (insn >> 5) & 0x07);*/
511 break;
512 default:
513 di->di_printf("[%c - unknown]", *f_ptr);
514 break;
515 }
516 if (*(f_ptr+1) >= 'A' && *(f_ptr+1) <= 'Z')
517 ++f_ptr;
518 else if (*(++f_ptr)) {
519 ++fmt;
520 if (fmt == 1)
521 di->di_printf("\t");
522 else
523 di->di_printf(", ");
524 }
525 };
526
527 di->di_printf("\n");
528
529 return(loc + INSN_SIZE);
530 }
531
532
533 static void
534 disasm_register_shift(const disasm_interface_t *di, u_int insn)
535 {
536 di->di_printf("r%d", (insn & 0x0f));
537 if ((insn & 0x00000ff0) == 0)
538 ;
539 else if ((insn & 0x00000ff0) == 0x00000060)
540 di->di_printf(", rrx");
541 else {
542 if (insn & 0x10)
543 di->di_printf(", %s r%d", op2_shift(insn),
544 (insn >> 8) & 0x0f);
545 else
546 di->di_printf(", %s #%d", op2_shift(insn),
547 (insn >> 7) & 0x1f);
548 }
549 }
550
551
552 static void
553 disasm_print_reglist(const disasm_interface_t *di, u_int insn)
554 {
555 int loop;
556 int start;
557 int comma;
558
559 di->di_printf("{");
560 start = -1;
561 comma = 0;
562
563 for (loop = 0; loop < 17; ++loop) {
564 if (start != -1) {
565 if (loop == 16 || !(insn & (1 << loop))) {
566 if (comma)
567 di->di_printf(", ");
568 else
569 comma = 1;
570 if (start == loop - 1)
571 di->di_printf("r%d", start);
572 else
573 di->di_printf("r%d-r%d", start, loop - 1);
574 start = -1;
575 }
576 } else {
577 if (insn & (1 << loop))
578 start = loop;
579 }
580 }
581 di->di_printf("}");
582
583 if (insn & (1 << 22))
584 di->di_printf("^");
585 }
586
587 static void
588 disasm_insn_ldrstr(const disasm_interface_t *di, u_int insn, u_int loc)
589 {
590 int offset;
591
592 offset = insn & 0xfff;
593 if ((insn & 0x032f0000) == 0x010f0000) {
594 /* rA = pc, immediate index */
595 if (insn & 0x00800000)
596 loc += offset;
597 else
598 loc -= offset;
599 di->di_printaddr(loc + 8);
600 } else {
601 di->di_printf("[r%d", (insn >> 16) & 0x0f);
602 if ((insn & 0x03000fff) != 0x01000000) {
603 di->di_printf("%s, ", (insn & (1 << 24)) ? "" : "]");
604 if (!(insn & 0x00800000))
605 di->di_printf("-");
606 if (insn & (1 << 25))
607 disasm_register_shift(di, insn);
608 else
609 di->di_printf("#0x%03x", offset);
610 }
611 if (insn & (1 << 24))
612 di->di_printf("]");
613 }
614 }
615
616 static void
617 disasm_insn_ldrhstrh(const disasm_interface_t *di, u_int insn, u_int loc)
618 {
619 int offset;
620
621 offset = ((insn & 0xf00) >> 4) | (insn & 0xf);
622 if ((insn & 0x004f0000) == 0x004f0000) {
623 /* rA = pc, immediate index */
624 if (insn & 0x00800000)
625 loc += offset;
626 else
627 loc -= offset;
628 di->di_printaddr(loc + 8);
629 } else {
630 di->di_printf("[r%d", (insn >> 16) & 0x0f);
631 if ((insn & 0x01400f0f) != 0x01400000) {
632 di->di_printf("%s, ", (insn & (1 << 24)) ? "" : "]");
633 if (!(insn & 0x00800000))
634 di->di_printf("-");
635 if (insn & (1 << 22))
636 di->di_printf("#0x%02x", offset);
637 else
638 di->di_printf("r%d", (insn & 0x0f));
639 }
640 if (insn & (1 << 24))
641 di->di_printf("]");
642 }
643 }
644
645 static void
646 disasm_insn_ldcstc(const disasm_interface_t *di, u_int insn, u_int loc)
647 {
648 if (((insn >> 8) & 0xf) == 1)
649 di->di_printf("f%d, ", (insn >> 12) & 0x07);
650 else
651 di->di_printf("c%d, ", (insn >> 12) & 0x0f);
652
653 di->di_printf("[r%d", (insn >> 16) & 0x0f);
654
655 di->di_printf("%s, ", (insn & (1 << 24)) ? "" : "]");
656
657 if (!(insn & (1 << 23)))
658 di->di_printf("-");
659
660 di->di_printf("#0x%03x", (insn & 0xff) << 2);
661
662 if (insn & (1 << 24))
663 di->di_printf("]");
664
665 if (insn & (1 << 21))
666 di->di_printf("!");
667 }
668
669 static u_int
670 disassemble_readword(u_int address)
671 {
672 return(*((u_int *)address));
673 }
674
675 static void
676 disassemble_printaddr(u_int address)
677 {
678 printf("0x%08x", address);
679 }
680
681 static const disasm_interface_t disassemble_di = {
682 disassemble_readword, disassemble_printaddr, db_printf
683 };
684
685 void
686 disassemble(u_int address)
687 {
688
689 (void)disasm(&disassemble_di, address, 0);
690 }
691
692 /* End of disassem.c */
Cache object: 3efff9a552ab5e5371ecc7d98d857007
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