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: /repoman/r/ncvs/src/sys/arm/arm/disassem.c,v 1.2 2005/01/05 21:58:47 imp Exp $");
52 #include <sys/param.h>
53 #include <stdio.h>
54
55 #include "disassem.h"
56 #include "armreg.h"
57 //#include <ddb/ddb.h>
58
59 /*
60 * General instruction format
61 *
62 * insn[cc][mod] [operands]
63 *
64 * Those fields with an uppercase format code indicate that the field
65 * follows directly after the instruction before the separator i.e.
66 * they modify the instruction rather than just being an operand to
67 * the instruction. The only exception is the writeback flag which
68 * follows a operand.
69 *
70 *
71 * 2 - print Operand 2 of a data processing instruction
72 * d - destination register (bits 12-15)
73 * n - n register (bits 16-19)
74 * s - s register (bits 8-11)
75 * o - indirect register rn (bits 16-19) (used by swap)
76 * m - m register (bits 0-3)
77 * a - address operand of ldr/str instruction
78 * e - address operand of ldrh/strh 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 { 0x0e1f0000, 0x080d0000, "stm", "YnWl" },/* separate out r13 base */
134 { 0x0e1f0000, 0x081d0000, "ldm", "YnWl" },/* separate out r13 base */
135 { 0x0e100000, 0x08000000, "stm", "XnWl" },
136 { 0x0e100000, 0x08100000, "ldm", "XnWl" },
137 { 0x0e1000f0, 0x00100090, "ldrb", "deW" },
138 { 0x0e1000f0, 0x00000090, "strb", "deW" },
139 { 0x0e1000f0, 0x001000d0, "ldrsb", "deW" },
140 { 0x0e1000f0, 0x001000b0, "ldrh", "deW" },
141 { 0x0e1000f0, 0x000000b0, "strh", "deW" },
142 { 0x0e1000f0, 0x001000f0, "ldrsh", "deW" },
143 { 0x0f200090, 0x00200090, "und", "x" }, /* Before data processing */
144 { 0x0e1000d0, 0x000000d0, "und", "x" }, /* Before data processing */
145 { 0x0ff00ff0, 0x01000090, "swp", "dmo" },
146 { 0x0ff00ff0, 0x01400090, "swpb", "dmo" },
147 { 0x0fbf0fff, 0x010f0000, "mrs", "dp" }, /* Before data processing */
148 { 0x0fb0fff0, 0x0120f000, "msr", "pFm" },/* Before data processing */
149 { 0x0fb0f000, 0x0320f000, "msr", "pF2" },/* Before data processing */
150 { 0x0ffffff0, 0x012fff10, "bx", "m" },
151 { 0x0fff0ff0, 0x016f0f10, "clz", "dm" },
152 { 0x0ffffff0, 0x012fff30, "blx", "m" },
153 { 0xfff000f0, 0xe1200070, "bkpt", "k" },
154 { 0x0de00000, 0x00000000, "and", "Sdn2" },
155 { 0x0de00000, 0x00200000, "eor", "Sdn2" },
156 { 0x0de00000, 0x00400000, "sub", "Sdn2" },
157 { 0x0de00000, 0x00600000, "rsb", "Sdn2" },
158 { 0x0de00000, 0x00800000, "add", "Sdn2" },
159 { 0x0de00000, 0x00a00000, "adc", "Sdn2" },
160 { 0x0de00000, 0x00c00000, "sbc", "Sdn2" },
161 { 0x0de00000, 0x00e00000, "rsc", "Sdn2" },
162 { 0x0df00000, 0x01100000, "tst", "Dn2" },
163 { 0x0df00000, 0x01300000, "teq", "Dn2" },
164 { 0x0df00000, 0x01500000, "cmp", "Dn2" },
165 { 0x0df00000, 0x01700000, "cmn", "Dn2" },
166 { 0x0de00000, 0x01800000, "orr", "Sdn2" },
167 { 0x0de00000, 0x01a00000, "mov", "Sd2" },
168 { 0x0de00000, 0x01c00000, "bic", "Sdn2" },
169 { 0x0de00000, 0x01e00000, "mvn", "Sd2" },
170 { 0x0ff08f10, 0x0e000100, "adf", "PRfgh" },
171 { 0x0ff08f10, 0x0e100100, "muf", "PRfgh" },
172 { 0x0ff08f10, 0x0e200100, "suf", "PRfgh" },
173 { 0x0ff08f10, 0x0e300100, "rsf", "PRfgh" },
174 { 0x0ff08f10, 0x0e400100, "dvf", "PRfgh" },
175 { 0x0ff08f10, 0x0e500100, "rdf", "PRfgh" },
176 { 0x0ff08f10, 0x0e600100, "pow", "PRfgh" },
177 { 0x0ff08f10, 0x0e700100, "rpw", "PRfgh" },
178 { 0x0ff08f10, 0x0e800100, "rmf", "PRfgh" },
179 { 0x0ff08f10, 0x0e900100, "fml", "PRfgh" },
180 { 0x0ff08f10, 0x0ea00100, "fdv", "PRfgh" },
181 { 0x0ff08f10, 0x0eb00100, "frd", "PRfgh" },
182 { 0x0ff08f10, 0x0ec00100, "pol", "PRfgh" },
183 { 0x0f008f10, 0x0e000100, "fpbop", "PRfgh" },
184 { 0x0ff08f10, 0x0e008100, "mvf", "PRfh" },
185 { 0x0ff08f10, 0x0e108100, "mnf", "PRfh" },
186 { 0x0ff08f10, 0x0e208100, "abs", "PRfh" },
187 { 0x0ff08f10, 0x0e308100, "rnd", "PRfh" },
188 { 0x0ff08f10, 0x0e408100, "sqt", "PRfh" },
189 { 0x0ff08f10, 0x0e508100, "log", "PRfh" },
190 { 0x0ff08f10, 0x0e608100, "lgn", "PRfh" },
191 { 0x0ff08f10, 0x0e708100, "exp", "PRfh" },
192 { 0x0ff08f10, 0x0e808100, "sin", "PRfh" },
193 { 0x0ff08f10, 0x0e908100, "cos", "PRfh" },
194 { 0x0ff08f10, 0x0ea08100, "tan", "PRfh" },
195 { 0x0ff08f10, 0x0eb08100, "asn", "PRfh" },
196 { 0x0ff08f10, 0x0ec08100, "acs", "PRfh" },
197 { 0x0ff08f10, 0x0ed08100, "atn", "PRfh" },
198 { 0x0f008f10, 0x0e008100, "fpuop", "PRfh" },
199 { 0x0e100f00, 0x0c000100, "stf", "QLv" },
200 { 0x0e100f00, 0x0c100100, "ldf", "QLv" },
201 { 0x0ff00f10, 0x0e000110, "flt", "PRgd" },
202 { 0x0ff00f10, 0x0e100110, "fix", "PRdh" },
203 { 0x0ff00f10, 0x0e200110, "wfs", "d" },
204 { 0x0ff00f10, 0x0e300110, "rfs", "d" },
205 { 0x0ff00f10, 0x0e400110, "wfc", "d" },
206 { 0x0ff00f10, 0x0e500110, "rfc", "d" },
207 { 0x0ff0ff10, 0x0e90f110, "cmf", "PRgh" },
208 { 0x0ff0ff10, 0x0eb0f110, "cnf", "PRgh" },
209 { 0x0ff0ff10, 0x0ed0f110, "cmfe", "PRgh" },
210 { 0x0ff0ff10, 0x0ef0f110, "cnfe", "PRgh" },
211 { 0xff100010, 0xfe000010, "mcr2", "#z" },
212 { 0x0f100010, 0x0e000010, "mcr", "#z" },
213 { 0xff100010, 0xfe100010, "mrc2", "#z" },
214 { 0x0f100010, 0x0e100010, "mrc", "#z" },
215 { 0xff000010, 0xfe000000, "cdp2", "#y" },
216 { 0x0f000010, 0x0e000000, "cdp", "#y" },
217 { 0xfe100090, 0xfc100000, "ldc2", "L#v" },
218 { 0x0e100090, 0x0c100000, "ldc", "L#v" },
219 { 0xfe100090, 0xfc000000, "stc2", "L#v" },
220 { 0x0e100090, 0x0c000000, "stc", "L#v" },
221 { 0xf550f000, 0xf550f000, "pld", "ne" },
222 { 0x0ff00ff0, 0x01000050, "qaad", "dmn" },
223 { 0x0ff00ff0, 0x01400050, "qdaad", "dmn" },
224 { 0x0ff00ff0, 0x01600050, "qdsub", "dmn" },
225 { 0x0ff00ff0, 0x01200050, "dsub", "dmn" },
226 { 0x0ff000f0, 0x01000080, "smlabb", "nmsd" }, // d & n inverted!!
227 { 0x0ff000f0, 0x010000a0, "smlatb", "nmsd" }, // d & n inverted!!
228 { 0x0ff000f0, 0x010000c0, "smlabt", "nmsd" }, // d & n inverted!!
229 { 0x0ff000f0, 0x010000e0, "smlatt", "nmsd" }, // d & n inverted!!
230 { 0x0ff000f0, 0x01400080, "smlalbb","ndms" }, // d & n inverted!!
231 { 0x0ff000f0, 0x014000a0, "smlaltb","ndms" }, // d & n inverted!!
232 { 0x0ff000f0, 0x014000c0, "smlalbt","ndms" }, // d & n inverted!!
233 { 0x0ff000f0, 0x014000e0, "smlaltt","ndms" }, // d & n inverted!!
234 { 0x0ff000f0, 0x01200080, "smlawb", "nmsd" }, // d & n inverted!!
235 { 0x0ff0f0f0, 0x012000a0, "smulwb","nms" }, // d & n inverted!!
236 { 0x0ff000f0, 0x012000c0, "smlawt", "nmsd" }, // d & n inverted!!
237 { 0x0ff0f0f0, 0x012000e0, "smulwt","nms" }, // d & n inverted!!
238 { 0x0ff0f0f0, 0x01600080, "smulbb","nms" }, // d & n inverted!!
239 { 0x0ff0f0f0, 0x016000a0, "smultb","nms" }, // d & n inverted!!
240 { 0x0ff0f0f0, 0x016000c0, "smulbt","nms" }, // d & n inverted!!
241 { 0x0ff0f0f0, 0x016000e0, "smultt","nms" }, // d & n inverted!!
242 { 0x00000000, 0x00000000, NULL, NULL }
243 };
244
245 static char const arm32_insn_conditions[][4] = {
246 "eq", "ne", "cs", "cc",
247 "mi", "pl", "vs", "vc",
248 "hi", "ls", "ge", "lt",
249 "gt", "le", "", "nv"
250 };
251
252 static char const insn_block_transfers[][4] = {
253 "da", "ia", "db", "ib"
254 };
255
256 static char const insn_stack_block_transfers[][4] = {
257 "ed", "ea", "fd", "fa"
258 };
259
260 static char const op_shifts[][4] = {
261 "lsl", "lsr", "asr", "ror"
262 };
263
264 static char const insn_fpa_rounding[][2] = {
265 "", "p", "m", "z"
266 };
267
268 static char const insn_fpa_precision[][2] = {
269 "s", "d", "e", "p"
270 };
271
272 static char const insn_fpaconstants[][8] = {
273 "0.0", "1.0", "2.0", "3.0",
274 "4.0", "5.0", "0.5", "10.0"
275 };
276
277 #define insn_condition(x) arm32_insn_conditions[(x >> 28) & 0x0f]
278 #define insn_blktrans(x) insn_block_transfers[(x >> 23) & 3]
279 #define insn_stkblktrans(x) insn_stack_block_transfers[(x >> 23) & 3]
280 #define op2_shift(x) op_shifts[(x >> 5) & 3]
281 #define insn_fparnd(x) insn_fpa_rounding[(x >> 5) & 0x03]
282 #define insn_fpaprec(x) insn_fpa_precision[(((x >> 18) & 2)|(x >> 7)) & 1]
283 #define insn_fpaprect(x) insn_fpa_precision[(((x >> 21) & 2)|(x >> 15)) & 1]
284 #define insn_fpaimm(x) insn_fpaconstants[x & 0x07]
285
286 /* Local prototypes */
287 static void disasm_register_shift(const disasm_interface_t *di, u_int insn);
288 static void disasm_print_reglist(const disasm_interface_t *di, u_int insn);
289 static void disasm_insn_ldrstr(const disasm_interface_t *di, u_int insn,
290 u_int loc);
291 static void disasm_insn_ldrhstrh(const disasm_interface_t *di, u_int insn,
292 u_int loc);
293 static void disasm_insn_ldcstc(const disasm_interface_t *di, u_int insn,
294 u_int loc);
295 static u_int disassemble_readword(u_int address);
296 static void disassemble_printaddr(u_int address);
297
298 u_int
disasm(const disasm_interface_t * di,u_int loc,int altfmt)299 disasm(const disasm_interface_t *di, u_int loc, int altfmt)
300 {
301 const struct arm32_insn *i_ptr = &arm32_i[0];
302
303 u_int insn;
304 int matchp;
305 int branch;
306 char* f_ptr;
307 int fmt;
308
309 fmt = 0;
310 matchp = 0;
311 insn = di->di_readword(loc);
312
313 /* di->di_printf("loc=%08x insn=%08x : ", loc, insn);*/
314
315 while (i_ptr->name) {
316 if ((insn & i_ptr->mask) == i_ptr->pattern) {
317 matchp = 1;
318 break;
319 }
320 i_ptr++;
321 }
322
323 if (!matchp) {
324 di->di_printf("und%s\t%08x\n", insn_condition(insn), insn);
325 return(loc + INSN_SIZE);
326 }
327
328 /* If instruction forces condition code, don't print it. */
329 if ((i_ptr->mask & 0xf0000000) == 0xf0000000)
330 di->di_printf("%s", i_ptr->name);
331 else
332 di->di_printf("%s%s", i_ptr->name, insn_condition(insn));
333
334 f_ptr = i_ptr->format;
335
336 /* Insert tab if there are no instruction modifiers */
337
338 if (*(f_ptr) < 'A' || *(f_ptr) > 'Z') {
339 ++fmt;
340 di->di_printf("\t");
341 }
342
343 while (*f_ptr) {
344 switch (*f_ptr) {
345 /* 2 - print Operand 2 of a data processing instruction */
346 case '2':
347 if (insn & 0x02000000) {
348 int rotate= ((insn >> 7) & 0x1e);
349
350 di->di_printf("#0x%08x",
351 (insn & 0xff) << (32 - rotate) |
352 (insn & 0xff) >> rotate);
353 } else {
354 disasm_register_shift(di, insn);
355 }
356 break;
357 /* d - destination register (bits 12-15) */
358 case 'd':
359 di->di_printf("r%d", ((insn >> 12) & 0x0f));
360 break;
361 /* D - insert 'p' if Rd is R15 */
362 case 'D':
363 if (((insn >> 12) & 0x0f) == 15)
364 di->di_printf("p");
365 break;
366 /* n - n register (bits 16-19) */
367 case 'n':
368 di->di_printf("r%d", ((insn >> 16) & 0x0f));
369 break;
370 /* s - s register (bits 8-11) */
371 case 's':
372 di->di_printf("r%d", ((insn >> 8) & 0x0f));
373 break;
374 /* o - indirect register rn (bits 16-19) (used by swap) */
375 case 'o':
376 di->di_printf("[r%d]", ((insn >> 16) & 0x0f));
377 break;
378 /* m - m register (bits 0-4) */
379 case 'm':
380 di->di_printf("r%d", ((insn >> 0) & 0x0f));
381 break;
382 /* a - address operand of ldr/str instruction */
383 case 'a':
384 disasm_insn_ldrstr(di, insn, loc);
385 break;
386 /* e - address operand of ldrh/strh instruction */
387 case 'e':
388 disasm_insn_ldrhstrh(di, insn, loc);
389 break;
390 /* l - register list for ldm/stm instruction */
391 case 'l':
392 disasm_print_reglist(di, insn);
393 break;
394 /* f - 1st fp operand (register) (bits 12-14) */
395 case 'f':
396 di->di_printf("f%d", (insn >> 12) & 7);
397 break;
398 /* g - 2nd fp operand (register) (bits 16-18) */
399 case 'g':
400 di->di_printf("f%d", (insn >> 16) & 7);
401 break;
402 /* h - 3rd fp operand (register/immediate) (bits 0-4) */
403 case 'h':
404 if (insn & (1 << 3))
405 di->di_printf("#%s", insn_fpaimm(insn));
406 else
407 di->di_printf("f%d", insn & 7);
408 break;
409 /* b - branch address */
410 case 'b':
411 branch = ((insn << 2) & 0x03ffffff);
412 if (branch & 0x02000000)
413 branch |= 0xfc000000;
414 di->di_printaddr(loc + 8 + branch);
415 break;
416 /* t - blx address */
417 case 't':
418 branch = ((insn << 2) & 0x03ffffff) |
419 (insn >> 23 & 0x00000002);
420 if (branch & 0x02000000)
421 branch |= 0xfc000000;
422 di->di_printaddr(loc + 8 + branch);
423 break;
424 /* X - block transfer type */
425 case 'X':
426 di->di_printf("%s", insn_blktrans(insn));
427 break;
428 /* Y - block transfer type (r13 base) */
429 case 'Y':
430 di->di_printf("%s", insn_stkblktrans(insn));
431 break;
432 /* c - comment field bits(0-23) */
433 case 'c':
434 di->di_printf("0x%08x", (insn & 0x00ffffff));
435 break;
436 /* k - breakpoint comment (bits 0-3, 8-19) */
437 case 'k':
438 di->di_printf("0x%04x",
439 (insn & 0x000fff00) >> 4 | (insn & 0x0000000f));
440 break;
441 /* p - saved or current status register */
442 case 'p':
443 if (insn & 0x00400000)
444 di->di_printf("spsr");
445 else
446 di->di_printf("cpsr");
447 break;
448 /* F - PSR transfer fields */
449 case 'F':
450 di->di_printf("_");
451 if (insn & (1 << 16))
452 di->di_printf("c");
453 if (insn & (1 << 17))
454 di->di_printf("x");
455 if (insn & (1 << 18))
456 di->di_printf("s");
457 if (insn & (1 << 19))
458 di->di_printf("f");
459 break;
460 /* B - byte transfer flag */
461 case 'B':
462 if (insn & 0x00400000)
463 di->di_printf("b");
464 break;
465 /* L - co-processor transfer size */
466 case 'L':
467 if (insn & (1 << 22))
468 di->di_printf("l");
469 break;
470 /* S - set status flag */
471 case 'S':
472 if (insn & 0x00100000)
473 di->di_printf("s");
474 break;
475 /* P - fp precision */
476 case 'P':
477 di->di_printf("%s", insn_fpaprec(insn));
478 break;
479 /* Q - fp precision (for ldf/stf) */
480 case 'Q':
481 break;
482 /* R - fp rounding */
483 case 'R':
484 di->di_printf("%s", insn_fparnd(insn));
485 break;
486 /* W - writeback flag */
487 case 'W':
488 if (insn & (1 << 21))
489 di->di_printf("!");
490 break;
491 /* # - co-processor number */
492 case '#':
493 di->di_printf("p%d", (insn >> 8) & 0x0f);
494 break;
495 /* v - co-processor data transfer registers+addressing mode */
496 case 'v':
497 disasm_insn_ldcstc(di, insn, loc);
498 break;
499 /* x - instruction in hex */
500 case 'x':
501 di->di_printf("0x%08x", insn);
502 break;
503 /* y - co-processor data processing registers */
504 case 'y':
505 di->di_printf("%d, ", (insn >> 20) & 0x0f);
506
507 di->di_printf("c%d, c%d, c%d", (insn >> 12) & 0x0f,
508 (insn >> 16) & 0x0f, insn & 0x0f);
509
510 di->di_printf(", %d", (insn >> 5) & 0x07);
511 break;
512 /* z - co-processor register transfer registers */
513 case 'z':
514 di->di_printf("%d, ", (insn >> 21) & 0x07);
515 di->di_printf("r%d, c%d, c%d, %d",
516 (insn >> 12) & 0x0f, (insn >> 16) & 0x0f,
517 insn & 0x0f, (insn >> 5) & 0x07);
518
519 /* if (((insn >> 5) & 0x07) != 0)
520 di->di_printf(", %d", (insn >> 5) & 0x07);*/
521 break;
522 default:
523 di->di_printf("[%c - unknown]", *f_ptr);
524 break;
525 }
526 if (*(f_ptr+1) >= 'A' && *(f_ptr+1) <= 'Z')
527 ++f_ptr;
528 else if (*(++f_ptr)) {
529 ++fmt;
530 if (fmt == 1)
531 di->di_printf("\t");
532 else
533 di->di_printf(", ");
534 }
535 };
536
537 di->di_printf("\n");
538
539 return(loc + INSN_SIZE);
540 }
541
542
543 static void
disasm_register_shift(const disasm_interface_t * di,u_int insn)544 disasm_register_shift(const disasm_interface_t *di, u_int insn)
545 {
546 di->di_printf("r%d", (insn & 0x0f));
547 if ((insn & 0x00000ff0) == 0)
548 ;
549 else if ((insn & 0x00000ff0) == 0x00000060)
550 di->di_printf(", rrx");
551 else {
552 if (insn & 0x10)
553 di->di_printf(", %s r%d", op2_shift(insn),
554 (insn >> 8) & 0x0f);
555 else
556 di->di_printf(", %s #%d", op2_shift(insn),
557 (insn >> 7) & 0x1f);
558 }
559 }
560
561
562 static void
disasm_print_reglist(const disasm_interface_t * di,u_int insn)563 disasm_print_reglist(const disasm_interface_t *di, u_int insn)
564 {
565 int loop;
566 int start;
567 int comma;
568
569 di->di_printf("{");
570 start = -1;
571 comma = 0;
572
573 for (loop = 0; loop < 17; ++loop) {
574 if (start != -1) {
575 if (loop == 16 || !(insn & (1 << loop))) {
576 if (comma)
577 di->di_printf(", ");
578 else
579 comma = 1;
580 if (start == loop - 1)
581 di->di_printf("r%d", start);
582 else
583 di->di_printf("r%d-r%d", start, loop - 1);
584 start = -1;
585 }
586 } else {
587 if (insn & (1 << loop))
588 start = loop;
589 }
590 }
591 di->di_printf("}");
592
593 if (insn & (1 << 22))
594 di->di_printf("^");
595 }
596
597 static void
disasm_insn_ldrstr(const disasm_interface_t * di,u_int insn,u_int loc)598 disasm_insn_ldrstr(const disasm_interface_t *di, u_int insn, u_int loc)
599 {
600 int offset;
601
602 offset = insn & 0xfff;
603 if ((insn & 0x032f0000) == 0x010f0000) {
604 /* rA = pc, immediate index */
605 if (insn & 0x00800000)
606 loc += offset;
607 else
608 loc -= offset;
609 di->di_printaddr(loc + 8);
610 } else {
611 di->di_printf("[r%d", (insn >> 16) & 0x0f);
612 if ((insn & 0x03000fff) != 0x01000000) {
613 di->di_printf("%s, ", (insn & (1 << 24)) ? "" : "]");
614 if (!(insn & 0x00800000))
615 di->di_printf("-");
616 if (insn & (1 << 25))
617 disasm_register_shift(di, insn);
618 else
619 di->di_printf("#0x%03x", offset);
620 }
621 if (insn & (1 << 24))
622 di->di_printf("]");
623 }
624 }
625
626 static void
disasm_insn_ldrhstrh(const disasm_interface_t * di,u_int insn,u_int loc)627 disasm_insn_ldrhstrh(const disasm_interface_t *di, u_int insn, u_int loc)
628 {
629 int offset;
630
631 offset = ((insn & 0xf00) >> 4) | (insn & 0xf);
632 if ((insn & 0x004f0000) == 0x004f0000) {
633 /* rA = pc, immediate index */
634 if (insn & 0x00800000)
635 loc += offset;
636 else
637 loc -= offset;
638 di->di_printaddr(loc + 8);
639 } else {
640 di->di_printf("[r%d", (insn >> 16) & 0x0f);
641 if ((insn & 0x01400f0f) != 0x01400000) {
642 di->di_printf("%s, ", (insn & (1 << 24)) ? "" : "]");
643 if (!(insn & 0x00800000))
644 di->di_printf("-");
645 if (insn & (1 << 22))
646 di->di_printf("#0x%02x", offset);
647 else
648 di->di_printf("r%d", (insn & 0x0f));
649 }
650 if (insn & (1 << 24))
651 di->di_printf("]");
652 }
653 }
654
655 static void
disasm_insn_ldcstc(const disasm_interface_t * di,u_int insn,u_int loc)656 disasm_insn_ldcstc(const disasm_interface_t *di, u_int insn, u_int loc)
657 {
658 if (((insn >> 8) & 0xf) == 1)
659 di->di_printf("f%d, ", (insn >> 12) & 0x07);
660 else
661 di->di_printf("c%d, ", (insn >> 12) & 0x0f);
662
663 di->di_printf("[r%d", (insn >> 16) & 0x0f);
664
665 di->di_printf("%s, ", (insn & (1 << 24)) ? "" : "]");
666
667 if (!(insn & (1 << 23)))
668 di->di_printf("-");
669
670 di->di_printf("#0x%03x", (insn & 0xff) << 2);
671
672 if (insn & (1 << 24))
673 di->di_printf("]");
674
675 if (insn & (1 << 21))
676 di->di_printf("!");
677 }
678
679 static u_int
disassemble_readword(u_int address)680 disassemble_readword(u_int address)
681 {
682 return(*((u_int *)address));
683 }
684
685 static void
disassemble_printaddr(u_int address)686 disassemble_printaddr(u_int address)
687 {
688 printf("0x%08x", address);
689 }
690
691 static const disasm_interface_t disassemble_di = {
692 disassemble_readword, disassemble_printaddr, printf
693 };
694
695 void
disassemble(u_int address)696 disassemble(u_int address)
697 {
698
699 (void)disasm(&disassemble_di, address, 0);
700 }
701
702 /* End of disassem.c */
703