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-rw-r--r--arch/arm/kernel/kprobes-thumb.c1462
1 files changed, 1462 insertions, 0 deletions
diff --git a/arch/arm/kernel/kprobes-thumb.c b/arch/arm/kernel/kprobes-thumb.c
new file mode 100644
index 000000000000..902ca59e8b11
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+++ b/arch/arm/kernel/kprobes-thumb.c
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1/*
2 * arch/arm/kernel/kprobes-thumb.c
3 *
4 * Copyright (C) 2011 Jon Medhurst <tixy@yxit.co.uk>.
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 version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <linux/kernel.h>
12#include <linux/kprobes.h>
13
14#include "kprobes.h"
15
16
17/*
18 * True if current instruction is in an IT block.
19 */
20#define in_it_block(cpsr) ((cpsr & 0x06000c00) != 0x00000000)
21
22/*
23 * Return the condition code to check for the currently executing instruction.
24 * This is in ITSTATE<7:4> which is in CPSR<15:12> but is only valid if
25 * in_it_block returns true.
26 */
27#define current_cond(cpsr) ((cpsr >> 12) & 0xf)
28
29/*
30 * Return the PC value for a probe in thumb code.
31 * This is the address of the probed instruction plus 4.
32 * We subtract one because the address will have bit zero set to indicate
33 * a pointer to thumb code.
34 */
35static inline unsigned long __kprobes thumb_probe_pc(struct kprobe *p)
36{
37 return (unsigned long)p->addr - 1 + 4;
38}
39
40static void __kprobes
41t32_simulate_table_branch(struct kprobe *p, struct pt_regs *regs)
42{
43 kprobe_opcode_t insn = p->opcode;
44 unsigned long pc = thumb_probe_pc(p);
45 int rn = (insn >> 16) & 0xf;
46 int rm = insn & 0xf;
47
48 unsigned long rnv = (rn == 15) ? pc : regs->uregs[rn];
49 unsigned long rmv = regs->uregs[rm];
50 unsigned int halfwords;
51
52 if (insn & 0x10) /* TBH */
53 halfwords = ((u16 *)rnv)[rmv];
54 else /* TBB */
55 halfwords = ((u8 *)rnv)[rmv];
56
57 regs->ARM_pc = pc + 2 * halfwords;
58}
59
60static void __kprobes
61t32_simulate_mrs(struct kprobe *p, struct pt_regs *regs)
62{
63 kprobe_opcode_t insn = p->opcode;
64 int rd = (insn >> 8) & 0xf;
65 unsigned long mask = 0xf8ff03df; /* Mask out execution state */
66 regs->uregs[rd] = regs->ARM_cpsr & mask;
67}
68
69static void __kprobes
70t32_simulate_cond_branch(struct kprobe *p, struct pt_regs *regs)
71{
72 kprobe_opcode_t insn = p->opcode;
73 unsigned long pc = thumb_probe_pc(p);
74
75 long offset = insn & 0x7ff; /* imm11 */
76 offset += (insn & 0x003f0000) >> 5; /* imm6 */
77 offset += (insn & 0x00002000) << 4; /* J1 */
78 offset += (insn & 0x00000800) << 7; /* J2 */
79 offset -= (insn & 0x04000000) >> 7; /* Apply sign bit */
80
81 regs->ARM_pc = pc + (offset * 2);
82}
83
84static enum kprobe_insn __kprobes
85t32_decode_cond_branch(kprobe_opcode_t insn, struct arch_specific_insn *asi)
86{
87 int cc = (insn >> 22) & 0xf;
88 asi->insn_check_cc = kprobe_condition_checks[cc];
89 asi->insn_handler = t32_simulate_cond_branch;
90 return INSN_GOOD_NO_SLOT;
91}
92
93static void __kprobes
94t32_simulate_branch(struct kprobe *p, struct pt_regs *regs)
95{
96 kprobe_opcode_t insn = p->opcode;
97 unsigned long pc = thumb_probe_pc(p);
98
99 long offset = insn & 0x7ff; /* imm11 */
100 offset += (insn & 0x03ff0000) >> 5; /* imm10 */
101 offset += (insn & 0x00002000) << 9; /* J1 */
102 offset += (insn & 0x00000800) << 10; /* J2 */
103 if (insn & 0x04000000)
104 offset -= 0x00800000; /* Apply sign bit */
105 else
106 offset ^= 0x00600000; /* Invert J1 and J2 */
107
108 if (insn & (1 << 14)) {
109 /* BL or BLX */
110 regs->ARM_lr = (unsigned long)p->addr + 4;
111 if (!(insn & (1 << 12))) {
112 /* BLX so switch to ARM mode */
113 regs->ARM_cpsr &= ~PSR_T_BIT;
114 pc &= ~3;
115 }
116 }
117
118 regs->ARM_pc = pc + (offset * 2);
119}
120
121static void __kprobes
122t32_simulate_ldr_literal(struct kprobe *p, struct pt_regs *regs)
123{
124 kprobe_opcode_t insn = p->opcode;
125 unsigned long addr = thumb_probe_pc(p) & ~3;
126 int rt = (insn >> 12) & 0xf;
127 unsigned long rtv;
128
129 long offset = insn & 0xfff;
130 if (insn & 0x00800000)
131 addr += offset;
132 else
133 addr -= offset;
134
135 if (insn & 0x00400000) {
136 /* LDR */
137 rtv = *(unsigned long *)addr;
138 if (rt == 15) {
139 bx_write_pc(rtv, regs);
140 return;
141 }
142 } else if (insn & 0x00200000) {
143 /* LDRH */
144 if (insn & 0x01000000)
145 rtv = *(s16 *)addr;
146 else
147 rtv = *(u16 *)addr;
148 } else {
149 /* LDRB */
150 if (insn & 0x01000000)
151 rtv = *(s8 *)addr;
152 else
153 rtv = *(u8 *)addr;
154 }
155
156 regs->uregs[rt] = rtv;
157}
158
159static enum kprobe_insn __kprobes
160t32_decode_ldmstm(kprobe_opcode_t insn, struct arch_specific_insn *asi)
161{
162 enum kprobe_insn ret = kprobe_decode_ldmstm(insn, asi);
163
164 /* Fixup modified instruction to have halfwords in correct order...*/
165 insn = asi->insn[0];
166 ((u16 *)asi->insn)[0] = insn >> 16;
167 ((u16 *)asi->insn)[1] = insn & 0xffff;
168
169 return ret;
170}
171
172static void __kprobes
173t32_emulate_ldrdstrd(struct kprobe *p, struct pt_regs *regs)
174{
175 kprobe_opcode_t insn = p->opcode;
176 unsigned long pc = thumb_probe_pc(p) & ~3;
177 int rt1 = (insn >> 12) & 0xf;
178 int rt2 = (insn >> 8) & 0xf;
179 int rn = (insn >> 16) & 0xf;
180
181 register unsigned long rt1v asm("r0") = regs->uregs[rt1];
182 register unsigned long rt2v asm("r1") = regs->uregs[rt2];
183 register unsigned long rnv asm("r2") = (rn == 15) ? pc
184 : regs->uregs[rn];
185
186 __asm__ __volatile__ (
187 "blx %[fn]"
188 : "=r" (rt1v), "=r" (rt2v), "=r" (rnv)
189 : "0" (rt1v), "1" (rt2v), "2" (rnv), [fn] "r" (p->ainsn.insn_fn)
190 : "lr", "memory", "cc"
191 );
192
193 if (rn != 15)
194 regs->uregs[rn] = rnv; /* Writeback base register */
195 regs->uregs[rt1] = rt1v;
196 regs->uregs[rt2] = rt2v;
197}
198
199static void __kprobes
200t32_emulate_ldrstr(struct kprobe *p, struct pt_regs *regs)
201{
202 kprobe_opcode_t insn = p->opcode;
203 int rt = (insn >> 12) & 0xf;
204 int rn = (insn >> 16) & 0xf;
205 int rm = insn & 0xf;
206
207 register unsigned long rtv asm("r0") = regs->uregs[rt];
208 register unsigned long rnv asm("r2") = regs->uregs[rn];
209 register unsigned long rmv asm("r3") = regs->uregs[rm];
210
211 __asm__ __volatile__ (
212 "blx %[fn]"
213 : "=r" (rtv), "=r" (rnv)
214 : "0" (rtv), "1" (rnv), "r" (rmv), [fn] "r" (p->ainsn.insn_fn)
215 : "lr", "memory", "cc"
216 );
217
218 regs->uregs[rn] = rnv; /* Writeback base register */
219 if (rt == 15) /* Can't be true for a STR as they aren't allowed */
220 bx_write_pc(rtv, regs);
221 else
222 regs->uregs[rt] = rtv;
223}
224
225static void __kprobes
226t32_emulate_rd8rn16rm0_rwflags(struct kprobe *p, struct pt_regs *regs)
227{
228 kprobe_opcode_t insn = p->opcode;
229 int rd = (insn >> 8) & 0xf;
230 int rn = (insn >> 16) & 0xf;
231 int rm = insn & 0xf;
232
233 register unsigned long rdv asm("r1") = regs->uregs[rd];
234 register unsigned long rnv asm("r2") = regs->uregs[rn];
235 register unsigned long rmv asm("r3") = regs->uregs[rm];
236 unsigned long cpsr = regs->ARM_cpsr;
237
238 __asm__ __volatile__ (
239 "msr cpsr_fs, %[cpsr] \n\t"
240 "blx %[fn] \n\t"
241 "mrs %[cpsr], cpsr \n\t"
242 : "=r" (rdv), [cpsr] "=r" (cpsr)
243 : "0" (rdv), "r" (rnv), "r" (rmv),
244 "1" (cpsr), [fn] "r" (p->ainsn.insn_fn)
245 : "lr", "memory", "cc"
246 );
247
248 regs->uregs[rd] = rdv;
249 regs->ARM_cpsr = (regs->ARM_cpsr & ~APSR_MASK) | (cpsr & APSR_MASK);
250}
251
252static void __kprobes
253t32_emulate_rd8pc16_noflags(struct kprobe *p, struct pt_regs *regs)
254{
255 kprobe_opcode_t insn = p->opcode;
256 unsigned long pc = thumb_probe_pc(p);
257 int rd = (insn >> 8) & 0xf;
258
259 register unsigned long rdv asm("r1") = regs->uregs[rd];
260 register unsigned long rnv asm("r2") = pc & ~3;
261
262 __asm__ __volatile__ (
263 "blx %[fn]"
264 : "=r" (rdv)
265 : "0" (rdv), "r" (rnv), [fn] "r" (p->ainsn.insn_fn)
266 : "lr", "memory", "cc"
267 );
268
269 regs->uregs[rd] = rdv;
270}
271
272static void __kprobes
273t32_emulate_rd8rn16_noflags(struct kprobe *p, struct pt_regs *regs)
274{
275 kprobe_opcode_t insn = p->opcode;
276 int rd = (insn >> 8) & 0xf;
277 int rn = (insn >> 16) & 0xf;
278
279 register unsigned long rdv asm("r1") = regs->uregs[rd];
280 register unsigned long rnv asm("r2") = regs->uregs[rn];
281
282 __asm__ __volatile__ (
283 "blx %[fn]"
284 : "=r" (rdv)
285 : "0" (rdv), "r" (rnv), [fn] "r" (p->ainsn.insn_fn)
286 : "lr", "memory", "cc"
287 );
288
289 regs->uregs[rd] = rdv;
290}
291
292static void __kprobes
293t32_emulate_rdlo12rdhi8rn16rm0_noflags(struct kprobe *p, struct pt_regs *regs)
294{
295 kprobe_opcode_t insn = p->opcode;
296 int rdlo = (insn >> 12) & 0xf;
297 int rdhi = (insn >> 8) & 0xf;
298 int rn = (insn >> 16) & 0xf;
299 int rm = insn & 0xf;
300
301 register unsigned long rdlov asm("r0") = regs->uregs[rdlo];
302 register unsigned long rdhiv asm("r1") = regs->uregs[rdhi];
303 register unsigned long rnv asm("r2") = regs->uregs[rn];
304 register unsigned long rmv asm("r3") = regs->uregs[rm];
305
306 __asm__ __volatile__ (
307 "blx %[fn]"
308 : "=r" (rdlov), "=r" (rdhiv)
309 : "0" (rdlov), "1" (rdhiv), "r" (rnv), "r" (rmv),
310 [fn] "r" (p->ainsn.insn_fn)
311 : "lr", "memory", "cc"
312 );
313
314 regs->uregs[rdlo] = rdlov;
315 regs->uregs[rdhi] = rdhiv;
316}
317
318/* These emulation encodings are functionally equivalent... */
319#define t32_emulate_rd8rn16rm0ra12_noflags \
320 t32_emulate_rdlo12rdhi8rn16rm0_noflags
321
322static const union decode_item t32_table_1110_100x_x0xx[] = {
323 /* Load/store multiple instructions */
324
325 /* Rn is PC 1110 100x x0xx 1111 xxxx xxxx xxxx xxxx */
326 DECODE_REJECT (0xfe4f0000, 0xe80f0000),
327
328 /* SRS 1110 1000 00x0 xxxx xxxx xxxx xxxx xxxx */
329 /* RFE 1110 1000 00x1 xxxx xxxx xxxx xxxx xxxx */
330 DECODE_REJECT (0xffc00000, 0xe8000000),
331 /* SRS 1110 1001 10x0 xxxx xxxx xxxx xxxx xxxx */
332 /* RFE 1110 1001 10x1 xxxx xxxx xxxx xxxx xxxx */
333 DECODE_REJECT (0xffc00000, 0xe9800000),
334
335 /* STM Rn, {...pc} 1110 100x x0x0 xxxx 1xxx xxxx xxxx xxxx */
336 DECODE_REJECT (0xfe508000, 0xe8008000),
337 /* LDM Rn, {...lr,pc} 1110 100x x0x1 xxxx 11xx xxxx xxxx xxxx */
338 DECODE_REJECT (0xfe50c000, 0xe810c000),
339 /* LDM/STM Rn, {...sp} 1110 100x x0xx xxxx xx1x xxxx xxxx xxxx */
340 DECODE_REJECT (0xfe402000, 0xe8002000),
341
342 /* STMIA 1110 1000 10x0 xxxx xxxx xxxx xxxx xxxx */
343 /* LDMIA 1110 1000 10x1 xxxx xxxx xxxx xxxx xxxx */
344 /* STMDB 1110 1001 00x0 xxxx xxxx xxxx xxxx xxxx */
345 /* LDMDB 1110 1001 00x1 xxxx xxxx xxxx xxxx xxxx */
346 DECODE_CUSTOM (0xfe400000, 0xe8000000, t32_decode_ldmstm),
347
348 DECODE_END
349};
350
351static const union decode_item t32_table_1110_100x_x1xx[] = {
352 /* Load/store dual, load/store exclusive, table branch */
353
354 /* STRD (immediate) 1110 1000 x110 xxxx xxxx xxxx xxxx xxxx */
355 /* LDRD (immediate) 1110 1000 x111 xxxx xxxx xxxx xxxx xxxx */
356 DECODE_OR (0xff600000, 0xe8600000),
357 /* STRD (immediate) 1110 1001 x1x0 xxxx xxxx xxxx xxxx xxxx */
358 /* LDRD (immediate) 1110 1001 x1x1 xxxx xxxx xxxx xxxx xxxx */
359 DECODE_EMULATEX (0xff400000, 0xe9400000, t32_emulate_ldrdstrd,
360 REGS(NOPCWB, NOSPPC, NOSPPC, 0, 0)),
361
362 /* TBB 1110 1000 1101 xxxx xxxx xxxx 0000 xxxx */
363 /* TBH 1110 1000 1101 xxxx xxxx xxxx 0001 xxxx */
364 DECODE_SIMULATEX(0xfff000e0, 0xe8d00000, t32_simulate_table_branch,
365 REGS(NOSP, 0, 0, 0, NOSPPC)),
366
367 /* STREX 1110 1000 0100 xxxx xxxx xxxx xxxx xxxx */
368 /* LDREX 1110 1000 0101 xxxx xxxx xxxx xxxx xxxx */
369 /* STREXB 1110 1000 1100 xxxx xxxx xxxx 0100 xxxx */
370 /* STREXH 1110 1000 1100 xxxx xxxx xxxx 0101 xxxx */
371 /* STREXD 1110 1000 1100 xxxx xxxx xxxx 0111 xxxx */
372 /* LDREXB 1110 1000 1101 xxxx xxxx xxxx 0100 xxxx */
373 /* LDREXH 1110 1000 1101 xxxx xxxx xxxx 0101 xxxx */
374 /* LDREXD 1110 1000 1101 xxxx xxxx xxxx 0111 xxxx */
375 /* And unallocated instructions... */
376 DECODE_END
377};
378
379static const union decode_item t32_table_1110_101x[] = {
380 /* Data-processing (shifted register) */
381
382 /* TST 1110 1010 0001 xxxx xxxx 1111 xxxx xxxx */
383 /* TEQ 1110 1010 1001 xxxx xxxx 1111 xxxx xxxx */
384 DECODE_EMULATEX (0xff700f00, 0xea100f00, t32_emulate_rd8rn16rm0_rwflags,
385 REGS(NOSPPC, 0, 0, 0, NOSPPC)),
386
387 /* CMN 1110 1011 0001 xxxx xxxx 1111 xxxx xxxx */
388 DECODE_OR (0xfff00f00, 0xeb100f00),
389 /* CMP 1110 1011 1011 xxxx xxxx 1111 xxxx xxxx */
390 DECODE_EMULATEX (0xfff00f00, 0xebb00f00, t32_emulate_rd8rn16rm0_rwflags,
391 REGS(NOPC, 0, 0, 0, NOSPPC)),
392
393 /* MOV 1110 1010 010x 1111 xxxx xxxx xxxx xxxx */
394 /* MVN 1110 1010 011x 1111 xxxx xxxx xxxx xxxx */
395 DECODE_EMULATEX (0xffcf0000, 0xea4f0000, t32_emulate_rd8rn16rm0_rwflags,
396 REGS(0, 0, NOSPPC, 0, NOSPPC)),
397
398 /* ??? 1110 1010 101x xxxx xxxx xxxx xxxx xxxx */
399 /* ??? 1110 1010 111x xxxx xxxx xxxx xxxx xxxx */
400 DECODE_REJECT (0xffa00000, 0xeaa00000),
401 /* ??? 1110 1011 001x xxxx xxxx xxxx xxxx xxxx */
402 DECODE_REJECT (0xffe00000, 0xeb200000),
403 /* ??? 1110 1011 100x xxxx xxxx xxxx xxxx xxxx */
404 DECODE_REJECT (0xffe00000, 0xeb800000),
405 /* ??? 1110 1011 111x xxxx xxxx xxxx xxxx xxxx */
406 DECODE_REJECT (0xffe00000, 0xebe00000),
407
408 /* ADD/SUB SP, SP, Rm, LSL #0..3 */
409 /* 1110 1011 x0xx 1101 x000 1101 xx00 xxxx */
410 DECODE_EMULATEX (0xff4f7f30, 0xeb0d0d00, t32_emulate_rd8rn16rm0_rwflags,
411 REGS(SP, 0, SP, 0, NOSPPC)),
412
413 /* ADD/SUB SP, SP, Rm, shift */
414 /* 1110 1011 x0xx 1101 xxxx 1101 xxxx xxxx */
415 DECODE_REJECT (0xff4f0f00, 0xeb0d0d00),
416
417 /* ADD/SUB Rd, SP, Rm, shift */
418 /* 1110 1011 x0xx 1101 xxxx xxxx xxxx xxxx */
419 DECODE_EMULATEX (0xff4f0000, 0xeb0d0000, t32_emulate_rd8rn16rm0_rwflags,
420 REGS(SP, 0, NOPC, 0, NOSPPC)),
421
422 /* AND 1110 1010 000x xxxx xxxx xxxx xxxx xxxx */
423 /* BIC 1110 1010 001x xxxx xxxx xxxx xxxx xxxx */
424 /* ORR 1110 1010 010x xxxx xxxx xxxx xxxx xxxx */
425 /* ORN 1110 1010 011x xxxx xxxx xxxx xxxx xxxx */
426 /* EOR 1110 1010 100x xxxx xxxx xxxx xxxx xxxx */
427 /* PKH 1110 1010 110x xxxx xxxx xxxx xxxx xxxx */
428 /* ADD 1110 1011 000x xxxx xxxx xxxx xxxx xxxx */
429 /* ADC 1110 1011 010x xxxx xxxx xxxx xxxx xxxx */
430 /* SBC 1110 1011 011x xxxx xxxx xxxx xxxx xxxx */
431 /* SUB 1110 1011 101x xxxx xxxx xxxx xxxx xxxx */
432 /* RSB 1110 1011 110x xxxx xxxx xxxx xxxx xxxx */
433 DECODE_EMULATEX (0xfe000000, 0xea000000, t32_emulate_rd8rn16rm0_rwflags,
434 REGS(NOSPPC, 0, NOSPPC, 0, NOSPPC)),
435
436 DECODE_END
437};
438
439static const union decode_item t32_table_1111_0x0x___0[] = {
440 /* Data-processing (modified immediate) */
441
442 /* TST 1111 0x00 0001 xxxx 0xxx 1111 xxxx xxxx */
443 /* TEQ 1111 0x00 1001 xxxx 0xxx 1111 xxxx xxxx */
444 DECODE_EMULATEX (0xfb708f00, 0xf0100f00, t32_emulate_rd8rn16rm0_rwflags,
445 REGS(NOSPPC, 0, 0, 0, 0)),
446
447 /* CMN 1111 0x01 0001 xxxx 0xxx 1111 xxxx xxxx */
448 DECODE_OR (0xfbf08f00, 0xf1100f00),
449 /* CMP 1111 0x01 1011 xxxx 0xxx 1111 xxxx xxxx */
450 DECODE_EMULATEX (0xfbf08f00, 0xf1b00f00, t32_emulate_rd8rn16rm0_rwflags,
451 REGS(NOPC, 0, 0, 0, 0)),
452
453 /* MOV 1111 0x00 010x 1111 0xxx xxxx xxxx xxxx */
454 /* MVN 1111 0x00 011x 1111 0xxx xxxx xxxx xxxx */
455 DECODE_EMULATEX (0xfbcf8000, 0xf04f0000, t32_emulate_rd8rn16rm0_rwflags,
456 REGS(0, 0, NOSPPC, 0, 0)),
457
458 /* ??? 1111 0x00 101x xxxx 0xxx xxxx xxxx xxxx */
459 DECODE_REJECT (0xfbe08000, 0xf0a00000),
460 /* ??? 1111 0x00 110x xxxx 0xxx xxxx xxxx xxxx */
461 /* ??? 1111 0x00 111x xxxx 0xxx xxxx xxxx xxxx */
462 DECODE_REJECT (0xfbc08000, 0xf0c00000),
463 /* ??? 1111 0x01 001x xxxx 0xxx xxxx xxxx xxxx */
464 DECODE_REJECT (0xfbe08000, 0xf1200000),
465 /* ??? 1111 0x01 100x xxxx 0xxx xxxx xxxx xxxx */
466 DECODE_REJECT (0xfbe08000, 0xf1800000),
467 /* ??? 1111 0x01 111x xxxx 0xxx xxxx xxxx xxxx */
468 DECODE_REJECT (0xfbe08000, 0xf1e00000),
469
470 /* ADD Rd, SP, #imm 1111 0x01 000x 1101 0xxx xxxx xxxx xxxx */
471 /* SUB Rd, SP, #imm 1111 0x01 101x 1101 0xxx xxxx xxxx xxxx */
472 DECODE_EMULATEX (0xfb4f8000, 0xf10d0000, t32_emulate_rd8rn16rm0_rwflags,
473 REGS(SP, 0, NOPC, 0, 0)),
474
475 /* AND 1111 0x00 000x xxxx 0xxx xxxx xxxx xxxx */
476 /* BIC 1111 0x00 001x xxxx 0xxx xxxx xxxx xxxx */
477 /* ORR 1111 0x00 010x xxxx 0xxx xxxx xxxx xxxx */
478 /* ORN 1111 0x00 011x xxxx 0xxx xxxx xxxx xxxx */
479 /* EOR 1111 0x00 100x xxxx 0xxx xxxx xxxx xxxx */
480 /* ADD 1111 0x01 000x xxxx 0xxx xxxx xxxx xxxx */
481 /* ADC 1111 0x01 010x xxxx 0xxx xxxx xxxx xxxx */
482 /* SBC 1111 0x01 011x xxxx 0xxx xxxx xxxx xxxx */
483 /* SUB 1111 0x01 101x xxxx 0xxx xxxx xxxx xxxx */
484 /* RSB 1111 0x01 110x xxxx 0xxx xxxx xxxx xxxx */
485 DECODE_EMULATEX (0xfa008000, 0xf0000000, t32_emulate_rd8rn16rm0_rwflags,
486 REGS(NOSPPC, 0, NOSPPC, 0, 0)),
487
488 DECODE_END
489};
490
491static const union decode_item t32_table_1111_0x1x___0[] = {
492 /* Data-processing (plain binary immediate) */
493
494 /* ADDW Rd, PC, #imm 1111 0x10 0000 1111 0xxx xxxx xxxx xxxx */
495 DECODE_OR (0xfbff8000, 0xf20f0000),
496 /* SUBW Rd, PC, #imm 1111 0x10 1010 1111 0xxx xxxx xxxx xxxx */
497 DECODE_EMULATEX (0xfbff8000, 0xf2af0000, t32_emulate_rd8pc16_noflags,
498 REGS(PC, 0, NOSPPC, 0, 0)),
499
500 /* ADDW SP, SP, #imm 1111 0x10 0000 1101 0xxx 1101 xxxx xxxx */
501 DECODE_OR (0xfbff8f00, 0xf20d0d00),
502 /* SUBW SP, SP, #imm 1111 0x10 1010 1101 0xxx 1101 xxxx xxxx */
503 DECODE_EMULATEX (0xfbff8f00, 0xf2ad0d00, t32_emulate_rd8rn16_noflags,
504 REGS(SP, 0, SP, 0, 0)),
505
506 /* ADDW 1111 0x10 0000 xxxx 0xxx xxxx xxxx xxxx */
507 DECODE_OR (0xfbf08000, 0xf2000000),
508 /* SUBW 1111 0x10 1010 xxxx 0xxx xxxx xxxx xxxx */
509 DECODE_EMULATEX (0xfbf08000, 0xf2a00000, t32_emulate_rd8rn16_noflags,
510 REGS(NOPCX, 0, NOSPPC, 0, 0)),
511
512 /* MOVW 1111 0x10 0100 xxxx 0xxx xxxx xxxx xxxx */
513 /* MOVT 1111 0x10 1100 xxxx 0xxx xxxx xxxx xxxx */
514 DECODE_EMULATEX (0xfb708000, 0xf2400000, t32_emulate_rd8rn16_noflags,
515 REGS(0, 0, NOSPPC, 0, 0)),
516
517 /* SSAT16 1111 0x11 0010 xxxx 0000 xxxx 00xx xxxx */
518 /* SSAT 1111 0x11 00x0 xxxx 0xxx xxxx xxxx xxxx */
519 /* USAT16 1111 0x11 1010 xxxx 0000 xxxx 00xx xxxx */
520 /* USAT 1111 0x11 10x0 xxxx 0xxx xxxx xxxx xxxx */
521 DECODE_EMULATEX (0xfb508000, 0xf3000000, t32_emulate_rd8rn16rm0_rwflags,
522 REGS(NOSPPC, 0, NOSPPC, 0, 0)),
523
524 /* SFBX 1111 0x11 0100 xxxx 0xxx xxxx xxxx xxxx */
525 /* UFBX 1111 0x11 1100 xxxx 0xxx xxxx xxxx xxxx */
526 DECODE_EMULATEX (0xfb708000, 0xf3400000, t32_emulate_rd8rn16_noflags,
527 REGS(NOSPPC, 0, NOSPPC, 0, 0)),
528
529 /* BFC 1111 0x11 0110 1111 0xxx xxxx xxxx xxxx */
530 DECODE_EMULATEX (0xfbff8000, 0xf36f0000, t32_emulate_rd8rn16_noflags,
531 REGS(0, 0, NOSPPC, 0, 0)),
532
533 /* BFI 1111 0x11 0110 xxxx 0xxx xxxx xxxx xxxx */
534 DECODE_EMULATEX (0xfbf08000, 0xf3600000, t32_emulate_rd8rn16_noflags,
535 REGS(NOSPPCX, 0, NOSPPC, 0, 0)),
536
537 DECODE_END
538};
539
540static const union decode_item t32_table_1111_0xxx___1[] = {
541 /* Branches and miscellaneous control */
542
543 /* YIELD 1111 0011 1010 xxxx 10x0 x000 0000 0001 */
544 DECODE_OR (0xfff0d7ff, 0xf3a08001),
545 /* SEV 1111 0011 1010 xxxx 10x0 x000 0000 0100 */
546 DECODE_EMULATE (0xfff0d7ff, 0xf3a08004, kprobe_emulate_none),
547 /* NOP 1111 0011 1010 xxxx 10x0 x000 0000 0000 */
548 /* WFE 1111 0011 1010 xxxx 10x0 x000 0000 0010 */
549 /* WFI 1111 0011 1010 xxxx 10x0 x000 0000 0011 */
550 DECODE_SIMULATE (0xfff0d7fc, 0xf3a08000, kprobe_simulate_nop),
551
552 /* MRS Rd, CPSR 1111 0011 1110 xxxx 10x0 xxxx xxxx xxxx */
553 DECODE_SIMULATEX(0xfff0d000, 0xf3e08000, t32_simulate_mrs,
554 REGS(0, 0, NOSPPC, 0, 0)),
555
556 /*
557 * Unsupported instructions
558 * 1111 0x11 1xxx xxxx 10x0 xxxx xxxx xxxx
559 *
560 * MSR 1111 0011 100x xxxx 10x0 xxxx xxxx xxxx
561 * DBG hint 1111 0011 1010 xxxx 10x0 x000 1111 xxxx
562 * Unallocated hints 1111 0011 1010 xxxx 10x0 x000 xxxx xxxx
563 * CPS 1111 0011 1010 xxxx 10x0 xxxx xxxx xxxx
564 * CLREX/DSB/DMB/ISB 1111 0011 1011 xxxx 10x0 xxxx xxxx xxxx
565 * BXJ 1111 0011 1100 xxxx 10x0 xxxx xxxx xxxx
566 * SUBS PC,LR,#<imm8> 1111 0011 1101 xxxx 10x0 xxxx xxxx xxxx
567 * MRS Rd, SPSR 1111 0011 1111 xxxx 10x0 xxxx xxxx xxxx
568 * SMC 1111 0111 1111 xxxx 1000 xxxx xxxx xxxx
569 * UNDEFINED 1111 0111 1111 xxxx 1010 xxxx xxxx xxxx
570 * ??? 1111 0111 1xxx xxxx 1010 xxxx xxxx xxxx
571 */
572 DECODE_REJECT (0xfb80d000, 0xf3808000),
573
574 /* Bcc 1111 0xxx xxxx xxxx 10x0 xxxx xxxx xxxx */
575 DECODE_CUSTOM (0xf800d000, 0xf0008000, t32_decode_cond_branch),
576
577 /* BLX 1111 0xxx xxxx xxxx 11x0 xxxx xxxx xxx0 */
578 DECODE_OR (0xf800d001, 0xf000c000),
579 /* B 1111 0xxx xxxx xxxx 10x1 xxxx xxxx xxxx */
580 /* BL 1111 0xxx xxxx xxxx 11x1 xxxx xxxx xxxx */
581 DECODE_SIMULATE (0xf8009000, 0xf0009000, t32_simulate_branch),
582
583 DECODE_END
584};
585
586static const union decode_item t32_table_1111_100x_x0x1__1111[] = {
587 /* Memory hints */
588
589 /* PLD (literal) 1111 1000 x001 1111 1111 xxxx xxxx xxxx */
590 /* PLI (literal) 1111 1001 x001 1111 1111 xxxx xxxx xxxx */
591 DECODE_SIMULATE (0xfe7ff000, 0xf81ff000, kprobe_simulate_nop),
592
593 /* PLD{W} (immediate) 1111 1000 10x1 xxxx 1111 xxxx xxxx xxxx */
594 DECODE_OR (0xffd0f000, 0xf890f000),
595 /* PLD{W} (immediate) 1111 1000 00x1 xxxx 1111 1100 xxxx xxxx */
596 DECODE_OR (0xffd0ff00, 0xf810fc00),
597 /* PLI (immediate) 1111 1001 1001 xxxx 1111 xxxx xxxx xxxx */
598 DECODE_OR (0xfff0f000, 0xf990f000),
599 /* PLI (immediate) 1111 1001 0001 xxxx 1111 1100 xxxx xxxx */
600 DECODE_SIMULATEX(0xfff0ff00, 0xf910fc00, kprobe_simulate_nop,
601 REGS(NOPCX, 0, 0, 0, 0)),
602
603 /* PLD{W} (register) 1111 1000 00x1 xxxx 1111 0000 00xx xxxx */
604 DECODE_OR (0xffd0ffc0, 0xf810f000),
605 /* PLI (register) 1111 1001 0001 xxxx 1111 0000 00xx xxxx */
606 DECODE_SIMULATEX(0xfff0ffc0, 0xf910f000, kprobe_simulate_nop,
607 REGS(NOPCX, 0, 0, 0, NOSPPC)),
608
609 /* Other unallocated instructions... */
610 DECODE_END
611};
612
613static const union decode_item t32_table_1111_100x[] = {
614 /* Store/Load single data item */
615
616 /* ??? 1111 100x x11x xxxx xxxx xxxx xxxx xxxx */
617 DECODE_REJECT (0xfe600000, 0xf8600000),
618
619 /* ??? 1111 1001 0101 xxxx xxxx xxxx xxxx xxxx */
620 DECODE_REJECT (0xfff00000, 0xf9500000),
621
622 /* ??? 1111 100x 0xxx xxxx xxxx 10x0 xxxx xxxx */
623 DECODE_REJECT (0xfe800d00, 0xf8000800),
624
625 /* STRBT 1111 1000 0000 xxxx xxxx 1110 xxxx xxxx */
626 /* STRHT 1111 1000 0010 xxxx xxxx 1110 xxxx xxxx */
627 /* STRT 1111 1000 0100 xxxx xxxx 1110 xxxx xxxx */
628 /* LDRBT 1111 1000 0001 xxxx xxxx 1110 xxxx xxxx */
629 /* LDRSBT 1111 1001 0001 xxxx xxxx 1110 xxxx xxxx */
630 /* LDRHT 1111 1000 0011 xxxx xxxx 1110 xxxx xxxx */
631 /* LDRSHT 1111 1001 0011 xxxx xxxx 1110 xxxx xxxx */
632 /* LDRT 1111 1000 0101 xxxx xxxx 1110 xxxx xxxx */
633 DECODE_REJECT (0xfe800f00, 0xf8000e00),
634
635 /* STR{,B,H} Rn,[PC...] 1111 1000 xxx0 1111 xxxx xxxx xxxx xxxx */
636 DECODE_REJECT (0xff1f0000, 0xf80f0000),
637
638 /* STR{,B,H} PC,[Rn...] 1111 1000 xxx0 xxxx 1111 xxxx xxxx xxxx */
639 DECODE_REJECT (0xff10f000, 0xf800f000),
640
641 /* LDR (literal) 1111 1000 x101 1111 xxxx xxxx xxxx xxxx */
642 DECODE_SIMULATEX(0xff7f0000, 0xf85f0000, t32_simulate_ldr_literal,
643 REGS(PC, ANY, 0, 0, 0)),
644
645 /* STR (immediate) 1111 1000 0100 xxxx xxxx 1xxx xxxx xxxx */
646 /* LDR (immediate) 1111 1000 0101 xxxx xxxx 1xxx xxxx xxxx */
647 DECODE_OR (0xffe00800, 0xf8400800),
648 /* STR (immediate) 1111 1000 1100 xxxx xxxx xxxx xxxx xxxx */
649 /* LDR (immediate) 1111 1000 1101 xxxx xxxx xxxx xxxx xxxx */
650 DECODE_EMULATEX (0xffe00000, 0xf8c00000, t32_emulate_ldrstr,
651 REGS(NOPCX, ANY, 0, 0, 0)),
652
653 /* STR (register) 1111 1000 0100 xxxx xxxx 0000 00xx xxxx */
654 /* LDR (register) 1111 1000 0101 xxxx xxxx 0000 00xx xxxx */
655 DECODE_EMULATEX (0xffe00fc0, 0xf8400000, t32_emulate_ldrstr,
656 REGS(NOPCX, ANY, 0, 0, NOSPPC)),
657
658 /* LDRB (literal) 1111 1000 x001 1111 xxxx xxxx xxxx xxxx */
659 /* LDRSB (literal) 1111 1001 x001 1111 xxxx xxxx xxxx xxxx */
660 /* LDRH (literal) 1111 1000 x011 1111 xxxx xxxx xxxx xxxx */
661 /* LDRSH (literal) 1111 1001 x011 1111 xxxx xxxx xxxx xxxx */
662 DECODE_EMULATEX (0xfe5f0000, 0xf81f0000, t32_simulate_ldr_literal,
663 REGS(PC, NOSPPCX, 0, 0, 0)),
664
665 /* STRB (immediate) 1111 1000 0000 xxxx xxxx 1xxx xxxx xxxx */
666 /* STRH (immediate) 1111 1000 0010 xxxx xxxx 1xxx xxxx xxxx */
667 /* LDRB (immediate) 1111 1000 0001 xxxx xxxx 1xxx xxxx xxxx */
668 /* LDRSB (immediate) 1111 1001 0001 xxxx xxxx 1xxx xxxx xxxx */
669 /* LDRH (immediate) 1111 1000 0011 xxxx xxxx 1xxx xxxx xxxx */
670 /* LDRSH (immediate) 1111 1001 0011 xxxx xxxx 1xxx xxxx xxxx */
671 DECODE_OR (0xfec00800, 0xf8000800),
672 /* STRB (immediate) 1111 1000 1000 xxxx xxxx xxxx xxxx xxxx */
673 /* STRH (immediate) 1111 1000 1010 xxxx xxxx xxxx xxxx xxxx */
674 /* LDRB (immediate) 1111 1000 1001 xxxx xxxx xxxx xxxx xxxx */
675 /* LDRSB (immediate) 1111 1001 1001 xxxx xxxx xxxx xxxx xxxx */
676 /* LDRH (immediate) 1111 1000 1011 xxxx xxxx xxxx xxxx xxxx */
677 /* LDRSH (immediate) 1111 1001 1011 xxxx xxxx xxxx xxxx xxxx */
678 DECODE_EMULATEX (0xfec00000, 0xf8800000, t32_emulate_ldrstr,
679 REGS(NOPCX, NOSPPCX, 0, 0, 0)),
680
681 /* STRB (register) 1111 1000 0000 xxxx xxxx 0000 00xx xxxx */
682 /* STRH (register) 1111 1000 0010 xxxx xxxx 0000 00xx xxxx */
683 /* LDRB (register) 1111 1000 0001 xxxx xxxx 0000 00xx xxxx */
684 /* LDRSB (register) 1111 1001 0001 xxxx xxxx 0000 00xx xxxx */
685 /* LDRH (register) 1111 1000 0011 xxxx xxxx 0000 00xx xxxx */
686 /* LDRSH (register) 1111 1001 0011 xxxx xxxx 0000 00xx xxxx */
687 DECODE_EMULATEX (0xfe800fc0, 0xf8000000, t32_emulate_ldrstr,
688 REGS(NOPCX, NOSPPCX, 0, 0, NOSPPC)),
689
690 /* Other unallocated instructions... */
691 DECODE_END
692};
693
694static const union decode_item t32_table_1111_1010___1111[] = {
695 /* Data-processing (register) */
696
697 /* ??? 1111 1010 011x xxxx 1111 xxxx 1xxx xxxx */
698 DECODE_REJECT (0xffe0f080, 0xfa60f080),
699
700 /* SXTH 1111 1010 0000 1111 1111 xxxx 1xxx xxxx */
701 /* UXTH 1111 1010 0001 1111 1111 xxxx 1xxx xxxx */
702 /* SXTB16 1111 1010 0010 1111 1111 xxxx 1xxx xxxx */
703 /* UXTB16 1111 1010 0011 1111 1111 xxxx 1xxx xxxx */
704 /* SXTB 1111 1010 0100 1111 1111 xxxx 1xxx xxxx */
705 /* UXTB 1111 1010 0101 1111 1111 xxxx 1xxx xxxx */
706 DECODE_EMULATEX (0xff8ff080, 0xfa0ff080, t32_emulate_rd8rn16rm0_rwflags,
707 REGS(0, 0, NOSPPC, 0, NOSPPC)),
708
709
710 /* ??? 1111 1010 1xxx xxxx 1111 xxxx 0x11 xxxx */
711 DECODE_REJECT (0xff80f0b0, 0xfa80f030),
712 /* ??? 1111 1010 1x11 xxxx 1111 xxxx 0xxx xxxx */
713 DECODE_REJECT (0xffb0f080, 0xfab0f000),
714
715 /* SADD16 1111 1010 1001 xxxx 1111 xxxx 0000 xxxx */
716 /* SASX 1111 1010 1010 xxxx 1111 xxxx 0000 xxxx */
717 /* SSAX 1111 1010 1110 xxxx 1111 xxxx 0000 xxxx */
718 /* SSUB16 1111 1010 1101 xxxx 1111 xxxx 0000 xxxx */
719 /* SADD8 1111 1010 1000 xxxx 1111 xxxx 0000 xxxx */
720 /* SSUB8 1111 1010 1100 xxxx 1111 xxxx 0000 xxxx */
721
722 /* QADD16 1111 1010 1001 xxxx 1111 xxxx 0001 xxxx */
723 /* QASX 1111 1010 1010 xxxx 1111 xxxx 0001 xxxx */
724 /* QSAX 1111 1010 1110 xxxx 1111 xxxx 0001 xxxx */
725 /* QSUB16 1111 1010 1101 xxxx 1111 xxxx 0001 xxxx */
726 /* QADD8 1111 1010 1000 xxxx 1111 xxxx 0001 xxxx */
727 /* QSUB8 1111 1010 1100 xxxx 1111 xxxx 0001 xxxx */
728
729 /* SHADD16 1111 1010 1001 xxxx 1111 xxxx 0010 xxxx */
730 /* SHASX 1111 1010 1010 xxxx 1111 xxxx 0010 xxxx */
731 /* SHSAX 1111 1010 1110 xxxx 1111 xxxx 0010 xxxx */
732 /* SHSUB16 1111 1010 1101 xxxx 1111 xxxx 0010 xxxx */
733 /* SHADD8 1111 1010 1000 xxxx 1111 xxxx 0010 xxxx */
734 /* SHSUB8 1111 1010 1100 xxxx 1111 xxxx 0010 xxxx */
735
736 /* UADD16 1111 1010 1001 xxxx 1111 xxxx 0100 xxxx */
737 /* UASX 1111 1010 1010 xxxx 1111 xxxx 0100 xxxx */
738 /* USAX 1111 1010 1110 xxxx 1111 xxxx 0100 xxxx */
739 /* USUB16 1111 1010 1101 xxxx 1111 xxxx 0100 xxxx */
740 /* UADD8 1111 1010 1000 xxxx 1111 xxxx 0100 xxxx */
741 /* USUB8 1111 1010 1100 xxxx 1111 xxxx 0100 xxxx */
742
743 /* UQADD16 1111 1010 1001 xxxx 1111 xxxx 0101 xxxx */
744 /* UQASX 1111 1010 1010 xxxx 1111 xxxx 0101 xxxx */
745 /* UQSAX 1111 1010 1110 xxxx 1111 xxxx 0101 xxxx */
746 /* UQSUB16 1111 1010 1101 xxxx 1111 xxxx 0101 xxxx */
747 /* UQADD8 1111 1010 1000 xxxx 1111 xxxx 0101 xxxx */
748 /* UQSUB8 1111 1010 1100 xxxx 1111 xxxx 0101 xxxx */
749
750 /* UHADD16 1111 1010 1001 xxxx 1111 xxxx 0110 xxxx */
751 /* UHASX 1111 1010 1010 xxxx 1111 xxxx 0110 xxxx */
752 /* UHSAX 1111 1010 1110 xxxx 1111 xxxx 0110 xxxx */
753 /* UHSUB16 1111 1010 1101 xxxx 1111 xxxx 0110 xxxx */
754 /* UHADD8 1111 1010 1000 xxxx 1111 xxxx 0110 xxxx */
755 /* UHSUB8 1111 1010 1100 xxxx 1111 xxxx 0110 xxxx */
756 DECODE_OR (0xff80f080, 0xfa80f000),
757
758 /* SXTAH 1111 1010 0000 xxxx 1111 xxxx 1xxx xxxx */
759 /* UXTAH 1111 1010 0001 xxxx 1111 xxxx 1xxx xxxx */
760 /* SXTAB16 1111 1010 0010 xxxx 1111 xxxx 1xxx xxxx */
761 /* UXTAB16 1111 1010 0011 xxxx 1111 xxxx 1xxx xxxx */
762 /* SXTAB 1111 1010 0100 xxxx 1111 xxxx 1xxx xxxx */
763 /* UXTAB 1111 1010 0101 xxxx 1111 xxxx 1xxx xxxx */
764 DECODE_OR (0xff80f080, 0xfa00f080),
765
766 /* QADD 1111 1010 1000 xxxx 1111 xxxx 1000 xxxx */
767 /* QDADD 1111 1010 1000 xxxx 1111 xxxx 1001 xxxx */
768 /* QSUB 1111 1010 1000 xxxx 1111 xxxx 1010 xxxx */
769 /* QDSUB 1111 1010 1000 xxxx 1111 xxxx 1011 xxxx */
770 DECODE_OR (0xfff0f0c0, 0xfa80f080),
771
772 /* SEL 1111 1010 1010 xxxx 1111 xxxx 1000 xxxx */
773 DECODE_OR (0xfff0f0f0, 0xfaa0f080),
774
775 /* LSL 1111 1010 000x xxxx 1111 xxxx 0000 xxxx */
776 /* LSR 1111 1010 001x xxxx 1111 xxxx 0000 xxxx */
777 /* ASR 1111 1010 010x xxxx 1111 xxxx 0000 xxxx */
778 /* ROR 1111 1010 011x xxxx 1111 xxxx 0000 xxxx */
779 DECODE_EMULATEX (0xff80f0f0, 0xfa00f000, t32_emulate_rd8rn16rm0_rwflags,
780 REGS(NOSPPC, 0, NOSPPC, 0, NOSPPC)),
781
782 /* CLZ 1111 1010 1010 xxxx 1111 xxxx 1000 xxxx */
783 DECODE_OR (0xfff0f0f0, 0xfab0f080),
784
785 /* REV 1111 1010 1001 xxxx 1111 xxxx 1000 xxxx */
786 /* REV16 1111 1010 1001 xxxx 1111 xxxx 1001 xxxx */
787 /* RBIT 1111 1010 1001 xxxx 1111 xxxx 1010 xxxx */
788 /* REVSH 1111 1010 1001 xxxx 1111 xxxx 1011 xxxx */
789 DECODE_EMULATEX (0xfff0f0c0, 0xfa90f080, t32_emulate_rd8rn16_noflags,
790 REGS(NOSPPC, 0, NOSPPC, 0, SAMEAS16)),
791
792 /* Other unallocated instructions... */
793 DECODE_END
794};
795
796static const union decode_item t32_table_1111_1011_0[] = {
797 /* Multiply, multiply accumulate, and absolute difference */
798
799 /* ??? 1111 1011 0000 xxxx 1111 xxxx 0001 xxxx */
800 DECODE_REJECT (0xfff0f0f0, 0xfb00f010),
801 /* ??? 1111 1011 0111 xxxx 1111 xxxx 0001 xxxx */
802 DECODE_REJECT (0xfff0f0f0, 0xfb70f010),
803
804 /* SMULxy 1111 1011 0001 xxxx 1111 xxxx 00xx xxxx */
805 DECODE_OR (0xfff0f0c0, 0xfb10f000),
806 /* MUL 1111 1011 0000 xxxx 1111 xxxx 0000 xxxx */
807 /* SMUAD{X} 1111 1011 0010 xxxx 1111 xxxx 000x xxxx */
808 /* SMULWy 1111 1011 0011 xxxx 1111 xxxx 000x xxxx */
809 /* SMUSD{X} 1111 1011 0100 xxxx 1111 xxxx 000x xxxx */
810 /* SMMUL{R} 1111 1011 0101 xxxx 1111 xxxx 000x xxxx */
811 /* USAD8 1111 1011 0111 xxxx 1111 xxxx 0000 xxxx */
812 DECODE_EMULATEX (0xff80f0e0, 0xfb00f000, t32_emulate_rd8rn16rm0_rwflags,
813 REGS(NOSPPC, 0, NOSPPC, 0, NOSPPC)),
814
815 /* ??? 1111 1011 0111 xxxx xxxx xxxx 0001 xxxx */
816 DECODE_REJECT (0xfff000f0, 0xfb700010),
817
818 /* SMLAxy 1111 1011 0001 xxxx xxxx xxxx 00xx xxxx */
819 DECODE_OR (0xfff000c0, 0xfb100000),
820 /* MLA 1111 1011 0000 xxxx xxxx xxxx 0000 xxxx */
821 /* MLS 1111 1011 0000 xxxx xxxx xxxx 0001 xxxx */
822 /* SMLAD{X} 1111 1011 0010 xxxx xxxx xxxx 000x xxxx */
823 /* SMLAWy 1111 1011 0011 xxxx xxxx xxxx 000x xxxx */
824 /* SMLSD{X} 1111 1011 0100 xxxx xxxx xxxx 000x xxxx */
825 /* SMMLA{R} 1111 1011 0101 xxxx xxxx xxxx 000x xxxx */
826 /* SMMLS{R} 1111 1011 0110 xxxx xxxx xxxx 000x xxxx */
827 /* USADA8 1111 1011 0111 xxxx xxxx xxxx 0000 xxxx */
828 DECODE_EMULATEX (0xff8000c0, 0xfb000000, t32_emulate_rd8rn16rm0ra12_noflags,
829 REGS(NOSPPC, NOSPPCX, NOSPPC, 0, NOSPPC)),
830
831 /* Other unallocated instructions... */
832 DECODE_END
833};
834
835static const union decode_item t32_table_1111_1011_1[] = {
836 /* Long multiply, long multiply accumulate, and divide */
837
838 /* UMAAL 1111 1011 1110 xxxx xxxx xxxx 0110 xxxx */
839 DECODE_OR (0xfff000f0, 0xfbe00060),
840 /* SMLALxy 1111 1011 1100 xxxx xxxx xxxx 10xx xxxx */
841 DECODE_OR (0xfff000c0, 0xfbc00080),
842 /* SMLALD{X} 1111 1011 1100 xxxx xxxx xxxx 110x xxxx */
843 /* SMLSLD{X} 1111 1011 1101 xxxx xxxx xxxx 110x xxxx */
844 DECODE_OR (0xffe000e0, 0xfbc000c0),
845 /* SMULL 1111 1011 1000 xxxx xxxx xxxx 0000 xxxx */
846 /* UMULL 1111 1011 1010 xxxx xxxx xxxx 0000 xxxx */
847 /* SMLAL 1111 1011 1100 xxxx xxxx xxxx 0000 xxxx */
848 /* UMLAL 1111 1011 1110 xxxx xxxx xxxx 0000 xxxx */
849 DECODE_EMULATEX (0xff9000f0, 0xfb800000, t32_emulate_rdlo12rdhi8rn16rm0_noflags,
850 REGS(NOSPPC, NOSPPC, NOSPPC, 0, NOSPPC)),
851
852 /* SDIV 1111 1011 1001 xxxx xxxx xxxx 1111 xxxx */
853 /* UDIV 1111 1011 1011 xxxx xxxx xxxx 1111 xxxx */
854 /* Other unallocated instructions... */
855 DECODE_END
856};
857
858const union decode_item kprobe_decode_thumb32_table[] = {
859
860 /*
861 * Load/store multiple instructions
862 * 1110 100x x0xx xxxx xxxx xxxx xxxx xxxx
863 */
864 DECODE_TABLE (0xfe400000, 0xe8000000, t32_table_1110_100x_x0xx),
865
866 /*
867 * Load/store dual, load/store exclusive, table branch
868 * 1110 100x x1xx xxxx xxxx xxxx xxxx xxxx
869 */
870 DECODE_TABLE (0xfe400000, 0xe8400000, t32_table_1110_100x_x1xx),
871
872 /*
873 * Data-processing (shifted register)
874 * 1110 101x xxxx xxxx xxxx xxxx xxxx xxxx
875 */
876 DECODE_TABLE (0xfe000000, 0xea000000, t32_table_1110_101x),
877
878 /*
879 * Coprocessor instructions
880 * 1110 11xx xxxx xxxx xxxx xxxx xxxx xxxx
881 */
882 DECODE_REJECT (0xfc000000, 0xec000000),
883
884 /*
885 * Data-processing (modified immediate)
886 * 1111 0x0x xxxx xxxx 0xxx xxxx xxxx xxxx
887 */
888 DECODE_TABLE (0xfa008000, 0xf0000000, t32_table_1111_0x0x___0),
889
890 /*
891 * Data-processing (plain binary immediate)
892 * 1111 0x1x xxxx xxxx 0xxx xxxx xxxx xxxx
893 */
894 DECODE_TABLE (0xfa008000, 0xf2000000, t32_table_1111_0x1x___0),
895
896 /*
897 * Branches and miscellaneous control
898 * 1111 0xxx xxxx xxxx 1xxx xxxx xxxx xxxx
899 */
900 DECODE_TABLE (0xf8008000, 0xf0008000, t32_table_1111_0xxx___1),
901
902 /*
903 * Advanced SIMD element or structure load/store instructions
904 * 1111 1001 xxx0 xxxx xxxx xxxx xxxx xxxx
905 */
906 DECODE_REJECT (0xff100000, 0xf9000000),
907
908 /*
909 * Memory hints
910 * 1111 100x x0x1 xxxx 1111 xxxx xxxx xxxx
911 */
912 DECODE_TABLE (0xfe50f000, 0xf810f000, t32_table_1111_100x_x0x1__1111),
913
914 /*
915 * Store single data item
916 * 1111 1000 xxx0 xxxx xxxx xxxx xxxx xxxx
917 * Load single data items
918 * 1111 100x xxx1 xxxx xxxx xxxx xxxx xxxx
919 */
920 DECODE_TABLE (0xfe000000, 0xf8000000, t32_table_1111_100x),
921
922 /*
923 * Data-processing (register)
924 * 1111 1010 xxxx xxxx 1111 xxxx xxxx xxxx
925 */
926 DECODE_TABLE (0xff00f000, 0xfa00f000, t32_table_1111_1010___1111),
927
928 /*
929 * Multiply, multiply accumulate, and absolute difference
930 * 1111 1011 0xxx xxxx xxxx xxxx xxxx xxxx
931 */
932 DECODE_TABLE (0xff800000, 0xfb000000, t32_table_1111_1011_0),
933
934 /*
935 * Long multiply, long multiply accumulate, and divide
936 * 1111 1011 1xxx xxxx xxxx xxxx xxxx xxxx
937 */
938 DECODE_TABLE (0xff800000, 0xfb800000, t32_table_1111_1011_1),
939
940 /*
941 * Coprocessor instructions
942 * 1111 11xx xxxx xxxx xxxx xxxx xxxx xxxx
943 */
944 DECODE_END
945};
946
947static void __kprobes
948t16_simulate_bxblx(struct kprobe *p, struct pt_regs *regs)
949{
950 kprobe_opcode_t insn = p->opcode;
951 unsigned long pc = thumb_probe_pc(p);
952 int rm = (insn >> 3) & 0xf;
953 unsigned long rmv = (rm == 15) ? pc : regs->uregs[rm];
954
955 if (insn & (1 << 7)) /* BLX ? */
956 regs->ARM_lr = (unsigned long)p->addr + 2;
957
958 bx_write_pc(rmv, regs);
959}
960
961static void __kprobes
962t16_simulate_ldr_literal(struct kprobe *p, struct pt_regs *regs)
963{
964 kprobe_opcode_t insn = p->opcode;
965 unsigned long* base = (unsigned long *)(thumb_probe_pc(p) & ~3);
966 long index = insn & 0xff;
967 int rt = (insn >> 8) & 0x7;
968 regs->uregs[rt] = base[index];
969}
970
971static void __kprobes
972t16_simulate_ldrstr_sp_relative(struct kprobe *p, struct pt_regs *regs)
973{
974 kprobe_opcode_t insn = p->opcode;
975 unsigned long* base = (unsigned long *)regs->ARM_sp;
976 long index = insn & 0xff;
977 int rt = (insn >> 8) & 0x7;
978 if (insn & 0x800) /* LDR */
979 regs->uregs[rt] = base[index];
980 else /* STR */
981 base[index] = regs->uregs[rt];
982}
983
984static void __kprobes
985t16_simulate_reladr(struct kprobe *p, struct pt_regs *regs)
986{
987 kprobe_opcode_t insn = p->opcode;
988 unsigned long base = (insn & 0x800) ? regs->ARM_sp
989 : (thumb_probe_pc(p) & ~3);
990 long offset = insn & 0xff;
991 int rt = (insn >> 8) & 0x7;
992 regs->uregs[rt] = base + offset * 4;
993}
994
995static void __kprobes
996t16_simulate_add_sp_imm(struct kprobe *p, struct pt_regs *regs)
997{
998 kprobe_opcode_t insn = p->opcode;
999 long imm = insn & 0x7f;
1000 if (insn & 0x80) /* SUB */
1001 regs->ARM_sp -= imm * 4;
1002 else /* ADD */
1003 regs->ARM_sp += imm * 4;
1004}
1005
1006static void __kprobes
1007t16_simulate_cbz(struct kprobe *p, struct pt_regs *regs)
1008{
1009 kprobe_opcode_t insn = p->opcode;
1010 int rn = insn & 0x7;
1011 kprobe_opcode_t nonzero = regs->uregs[rn] ? insn : ~insn;
1012 if (nonzero & 0x800) {
1013 long i = insn & 0x200;
1014 long imm5 = insn & 0xf8;
1015 unsigned long pc = thumb_probe_pc(p);
1016 regs->ARM_pc = pc + (i >> 3) + (imm5 >> 2);
1017 }
1018}
1019
1020static void __kprobes
1021t16_simulate_it(struct kprobe *p, struct pt_regs *regs)
1022{
1023 /*
1024 * The 8 IT state bits are split into two parts in CPSR:
1025 * ITSTATE<1:0> are in CPSR<26:25>
1026 * ITSTATE<7:2> are in CPSR<15:10>
1027 * The new IT state is in the lower byte of insn.
1028 */
1029 kprobe_opcode_t insn = p->opcode;
1030 unsigned long cpsr = regs->ARM_cpsr;
1031 cpsr &= ~PSR_IT_MASK;
1032 cpsr |= (insn & 0xfc) << 8;
1033 cpsr |= (insn & 0x03) << 25;
1034 regs->ARM_cpsr = cpsr;
1035}
1036
1037static void __kprobes
1038t16_singlestep_it(struct kprobe *p, struct pt_regs *regs)
1039{
1040 regs->ARM_pc += 2;
1041 t16_simulate_it(p, regs);
1042}
1043
1044static enum kprobe_insn __kprobes
1045t16_decode_it(kprobe_opcode_t insn, struct arch_specific_insn *asi)
1046{
1047 asi->insn_singlestep = t16_singlestep_it;
1048 return INSN_GOOD_NO_SLOT;
1049}
1050
1051static void __kprobes
1052t16_simulate_cond_branch(struct kprobe *p, struct pt_regs *regs)
1053{
1054 kprobe_opcode_t insn = p->opcode;
1055 unsigned long pc = thumb_probe_pc(p);
1056 long offset = insn & 0x7f;
1057 offset -= insn & 0x80; /* Apply sign bit */
1058 regs->ARM_pc = pc + (offset * 2);
1059}
1060
1061static enum kprobe_insn __kprobes
1062t16_decode_cond_branch(kprobe_opcode_t insn, struct arch_specific_insn *asi)
1063{
1064 int cc = (insn >> 8) & 0xf;
1065 asi->insn_check_cc = kprobe_condition_checks[cc];
1066 asi->insn_handler = t16_simulate_cond_branch;
1067 return INSN_GOOD_NO_SLOT;
1068}
1069
1070static void __kprobes
1071t16_simulate_branch(struct kprobe *p, struct pt_regs *regs)
1072{
1073 kprobe_opcode_t insn = p->opcode;
1074 unsigned long pc = thumb_probe_pc(p);
1075 long offset = insn & 0x3ff;
1076 offset -= insn & 0x400; /* Apply sign bit */
1077 regs->ARM_pc = pc + (offset * 2);
1078}
1079
1080static unsigned long __kprobes
1081t16_emulate_loregs(struct kprobe *p, struct pt_regs *regs)
1082{
1083 unsigned long oldcpsr = regs->ARM_cpsr;
1084 unsigned long newcpsr;
1085
1086 __asm__ __volatile__ (
1087 "msr cpsr_fs, %[oldcpsr] \n\t"
1088 "ldmia %[regs], {r0-r7} \n\t"
1089 "blx %[fn] \n\t"
1090 "stmia %[regs], {r0-r7} \n\t"
1091 "mrs %[newcpsr], cpsr \n\t"
1092 : [newcpsr] "=r" (newcpsr)
1093 : [oldcpsr] "r" (oldcpsr), [regs] "r" (regs),
1094 [fn] "r" (p->ainsn.insn_fn)
1095 : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1096 "lr", "memory", "cc"
1097 );
1098
1099 return (oldcpsr & ~APSR_MASK) | (newcpsr & APSR_MASK);
1100}
1101
1102static void __kprobes
1103t16_emulate_loregs_rwflags(struct kprobe *p, struct pt_regs *regs)
1104{
1105 regs->ARM_cpsr = t16_emulate_loregs(p, regs);
1106}
1107
1108static void __kprobes
1109t16_emulate_loregs_noitrwflags(struct kprobe *p, struct pt_regs *regs)
1110{
1111 unsigned long cpsr = t16_emulate_loregs(p, regs);
1112 if (!in_it_block(cpsr))
1113 regs->ARM_cpsr = cpsr;
1114}
1115
1116static void __kprobes
1117t16_emulate_hiregs(struct kprobe *p, struct pt_regs *regs)
1118{
1119 kprobe_opcode_t insn = p->opcode;
1120 unsigned long pc = thumb_probe_pc(p);
1121 int rdn = (insn & 0x7) | ((insn & 0x80) >> 4);
1122 int rm = (insn >> 3) & 0xf;
1123
1124 register unsigned long rdnv asm("r1");
1125 register unsigned long rmv asm("r0");
1126 unsigned long cpsr = regs->ARM_cpsr;
1127
1128 rdnv = (rdn == 15) ? pc : regs->uregs[rdn];
1129 rmv = (rm == 15) ? pc : regs->uregs[rm];
1130
1131 __asm__ __volatile__ (
1132 "msr cpsr_fs, %[cpsr] \n\t"
1133 "blx %[fn] \n\t"
1134 "mrs %[cpsr], cpsr \n\t"
1135 : "=r" (rdnv), [cpsr] "=r" (cpsr)
1136 : "0" (rdnv), "r" (rmv), "1" (cpsr), [fn] "r" (p->ainsn.insn_fn)
1137 : "lr", "memory", "cc"
1138 );
1139
1140 if (rdn == 15)
1141 rdnv &= ~1;
1142
1143 regs->uregs[rdn] = rdnv;
1144 regs->ARM_cpsr = (regs->ARM_cpsr & ~APSR_MASK) | (cpsr & APSR_MASK);
1145}
1146
1147static enum kprobe_insn __kprobes
1148t16_decode_hiregs(kprobe_opcode_t insn, struct arch_specific_insn *asi)
1149{
1150 insn &= ~0x00ff;
1151 insn |= 0x001; /* Set Rdn = R1 and Rm = R0 */
1152 ((u16 *)asi->insn)[0] = insn;
1153 asi->insn_handler = t16_emulate_hiregs;
1154 return INSN_GOOD;
1155}
1156
1157static void __kprobes
1158t16_emulate_push(struct kprobe *p, struct pt_regs *regs)
1159{
1160 __asm__ __volatile__ (
1161 "ldr r9, [%[regs], #13*4] \n\t"
1162 "ldr r8, [%[regs], #14*4] \n\t"
1163 "ldmia %[regs], {r0-r7} \n\t"
1164 "blx %[fn] \n\t"
1165 "str r9, [%[regs], #13*4] \n\t"
1166 :
1167 : [regs] "r" (regs), [fn] "r" (p->ainsn.insn_fn)
1168 : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9",
1169 "lr", "memory", "cc"
1170 );
1171}
1172
1173static enum kprobe_insn __kprobes
1174t16_decode_push(kprobe_opcode_t insn, struct arch_specific_insn *asi)
1175{
1176 /*
1177 * To simulate a PUSH we use a Thumb-2 "STMDB R9!, {registers}"
1178 * and call it with R9=SP and LR in the register list represented
1179 * by R8.
1180 */
1181 ((u16 *)asi->insn)[0] = 0xe929; /* 1st half STMDB R9!,{} */
1182 ((u16 *)asi->insn)[1] = insn & 0x1ff; /* 2nd half (register list) */
1183 asi->insn_handler = t16_emulate_push;
1184 return INSN_GOOD;
1185}
1186
1187static void __kprobes
1188t16_emulate_pop_nopc(struct kprobe *p, struct pt_regs *regs)
1189{
1190 __asm__ __volatile__ (
1191 "ldr r9, [%[regs], #13*4] \n\t"
1192 "ldmia %[regs], {r0-r7} \n\t"
1193 "blx %[fn] \n\t"
1194 "stmia %[regs], {r0-r7} \n\t"
1195 "str r9, [%[regs], #13*4] \n\t"
1196 :
1197 : [regs] "r" (regs), [fn] "r" (p->ainsn.insn_fn)
1198 : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r9",
1199 "lr", "memory", "cc"
1200 );
1201}
1202
1203static void __kprobes
1204t16_emulate_pop_pc(struct kprobe *p, struct pt_regs *regs)
1205{
1206 register unsigned long pc asm("r8");
1207
1208 __asm__ __volatile__ (
1209 "ldr r9, [%[regs], #13*4] \n\t"
1210 "ldmia %[regs], {r0-r7} \n\t"
1211 "blx %[fn] \n\t"
1212 "stmia %[regs], {r0-r7} \n\t"
1213 "str r9, [%[regs], #13*4] \n\t"
1214 : "=r" (pc)
1215 : [regs] "r" (regs), [fn] "r" (p->ainsn.insn_fn)
1216 : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r9",
1217 "lr", "memory", "cc"
1218 );
1219
1220 bx_write_pc(pc, regs);
1221}
1222
1223static enum kprobe_insn __kprobes
1224t16_decode_pop(kprobe_opcode_t insn, struct arch_specific_insn *asi)
1225{
1226 /*
1227 * To simulate a POP we use a Thumb-2 "LDMDB R9!, {registers}"
1228 * and call it with R9=SP and PC in the register list represented
1229 * by R8.
1230 */
1231 ((u16 *)asi->insn)[0] = 0xe8b9; /* 1st half LDMIA R9!,{} */
1232 ((u16 *)asi->insn)[1] = insn & 0x1ff; /* 2nd half (register list) */
1233 asi->insn_handler = insn & 0x100 ? t16_emulate_pop_pc
1234 : t16_emulate_pop_nopc;
1235 return INSN_GOOD;
1236}
1237
1238static const union decode_item t16_table_1011[] = {
1239 /* Miscellaneous 16-bit instructions */
1240
1241 /* ADD (SP plus immediate) 1011 0000 0xxx xxxx */
1242 /* SUB (SP minus immediate) 1011 0000 1xxx xxxx */
1243 DECODE_SIMULATE (0xff00, 0xb000, t16_simulate_add_sp_imm),
1244
1245 /* CBZ 1011 00x1 xxxx xxxx */
1246 /* CBNZ 1011 10x1 xxxx xxxx */
1247 DECODE_SIMULATE (0xf500, 0xb100, t16_simulate_cbz),
1248
1249 /* SXTH 1011 0010 00xx xxxx */
1250 /* SXTB 1011 0010 01xx xxxx */
1251 /* UXTH 1011 0010 10xx xxxx */
1252 /* UXTB 1011 0010 11xx xxxx */
1253 /* REV 1011 1010 00xx xxxx */
1254 /* REV16 1011 1010 01xx xxxx */
1255 /* ??? 1011 1010 10xx xxxx */
1256 /* REVSH 1011 1010 11xx xxxx */
1257 DECODE_REJECT (0xffc0, 0xba80),
1258 DECODE_EMULATE (0xf500, 0xb000, t16_emulate_loregs_rwflags),
1259
1260 /* PUSH 1011 010x xxxx xxxx */
1261 DECODE_CUSTOM (0xfe00, 0xb400, t16_decode_push),
1262 /* POP 1011 110x xxxx xxxx */
1263 DECODE_CUSTOM (0xfe00, 0xbc00, t16_decode_pop),
1264
1265 /*
1266 * If-Then, and hints
1267 * 1011 1111 xxxx xxxx
1268 */
1269
1270 /* YIELD 1011 1111 0001 0000 */
1271 DECODE_OR (0xffff, 0xbf10),
1272 /* SEV 1011 1111 0100 0000 */
1273 DECODE_EMULATE (0xffff, 0xbf40, kprobe_emulate_none),
1274 /* NOP 1011 1111 0000 0000 */
1275 /* WFE 1011 1111 0010 0000 */
1276 /* WFI 1011 1111 0011 0000 */
1277 DECODE_SIMULATE (0xffcf, 0xbf00, kprobe_simulate_nop),
1278 /* Unassigned hints 1011 1111 xxxx 0000 */
1279 DECODE_REJECT (0xff0f, 0xbf00),
1280 /* IT 1011 1111 xxxx xxxx */
1281 DECODE_CUSTOM (0xff00, 0xbf00, t16_decode_it),
1282
1283 /* SETEND 1011 0110 010x xxxx */
1284 /* CPS 1011 0110 011x xxxx */
1285 /* BKPT 1011 1110 xxxx xxxx */
1286 /* And unallocated instructions... */
1287 DECODE_END
1288};
1289
1290const union decode_item kprobe_decode_thumb16_table[] = {
1291
1292 /*
1293 * Shift (immediate), add, subtract, move, and compare
1294 * 00xx xxxx xxxx xxxx
1295 */
1296
1297 /* CMP (immediate) 0010 1xxx xxxx xxxx */
1298 DECODE_EMULATE (0xf800, 0x2800, t16_emulate_loregs_rwflags),
1299
1300 /* ADD (register) 0001 100x xxxx xxxx */
1301 /* SUB (register) 0001 101x xxxx xxxx */
1302 /* LSL (immediate) 0000 0xxx xxxx xxxx */
1303 /* LSR (immediate) 0000 1xxx xxxx xxxx */
1304 /* ASR (immediate) 0001 0xxx xxxx xxxx */
1305 /* ADD (immediate, Thumb) 0001 110x xxxx xxxx */
1306 /* SUB (immediate, Thumb) 0001 111x xxxx xxxx */
1307 /* MOV (immediate) 0010 0xxx xxxx xxxx */
1308 /* ADD (immediate, Thumb) 0011 0xxx xxxx xxxx */
1309 /* SUB (immediate, Thumb) 0011 1xxx xxxx xxxx */
1310 DECODE_EMULATE (0xc000, 0x0000, t16_emulate_loregs_noitrwflags),
1311
1312 /*
1313 * 16-bit Thumb data-processing instructions
1314 * 0100 00xx xxxx xxxx
1315 */
1316
1317 /* TST (register) 0100 0010 00xx xxxx */
1318 DECODE_EMULATE (0xffc0, 0x4200, t16_emulate_loregs_rwflags),
1319 /* CMP (register) 0100 0010 10xx xxxx */
1320 /* CMN (register) 0100 0010 11xx xxxx */
1321 DECODE_EMULATE (0xff80, 0x4280, t16_emulate_loregs_rwflags),
1322 /* AND (register) 0100 0000 00xx xxxx */
1323 /* EOR (register) 0100 0000 01xx xxxx */
1324 /* LSL (register) 0100 0000 10xx xxxx */
1325 /* LSR (register) 0100 0000 11xx xxxx */
1326 /* ASR (register) 0100 0001 00xx xxxx */
1327 /* ADC (register) 0100 0001 01xx xxxx */
1328 /* SBC (register) 0100 0001 10xx xxxx */
1329 /* ROR (register) 0100 0001 11xx xxxx */
1330 /* RSB (immediate) 0100 0010 01xx xxxx */
1331 /* ORR (register) 0100 0011 00xx xxxx */
1332 /* MUL 0100 0011 00xx xxxx */
1333 /* BIC (register) 0100 0011 10xx xxxx */
1334 /* MVN (register) 0100 0011 10xx xxxx */
1335 DECODE_EMULATE (0xfc00, 0x4000, t16_emulate_loregs_noitrwflags),
1336
1337 /*
1338 * Special data instructions and branch and exchange
1339 * 0100 01xx xxxx xxxx
1340 */
1341
1342 /* BLX pc 0100 0111 1111 1xxx */
1343 DECODE_REJECT (0xfff8, 0x47f8),
1344
1345 /* BX (register) 0100 0111 0xxx xxxx */
1346 /* BLX (register) 0100 0111 1xxx xxxx */
1347 DECODE_SIMULATE (0xff00, 0x4700, t16_simulate_bxblx),
1348
1349 /* ADD pc, pc 0100 0100 1111 1111 */
1350 DECODE_REJECT (0xffff, 0x44ff),
1351
1352 /* ADD (register) 0100 0100 xxxx xxxx */
1353 /* CMP (register) 0100 0101 xxxx xxxx */
1354 /* MOV (register) 0100 0110 xxxx xxxx */
1355 DECODE_CUSTOM (0xfc00, 0x4400, t16_decode_hiregs),
1356
1357 /*
1358 * Load from Literal Pool
1359 * LDR (literal) 0100 1xxx xxxx xxxx
1360 */
1361 DECODE_SIMULATE (0xf800, 0x4800, t16_simulate_ldr_literal),
1362
1363 /*
1364 * 16-bit Thumb Load/store instructions
1365 * 0101 xxxx xxxx xxxx
1366 * 011x xxxx xxxx xxxx
1367 * 100x xxxx xxxx xxxx
1368 */
1369
1370 /* STR (register) 0101 000x xxxx xxxx */
1371 /* STRH (register) 0101 001x xxxx xxxx */
1372 /* STRB (register) 0101 010x xxxx xxxx */
1373 /* LDRSB (register) 0101 011x xxxx xxxx */
1374 /* LDR (register) 0101 100x xxxx xxxx */
1375 /* LDRH (register) 0101 101x xxxx xxxx */
1376 /* LDRB (register) 0101 110x xxxx xxxx */
1377 /* LDRSH (register) 0101 111x xxxx xxxx */
1378 /* STR (immediate, Thumb) 0110 0xxx xxxx xxxx */
1379 /* LDR (immediate, Thumb) 0110 1xxx xxxx xxxx */
1380 /* STRB (immediate, Thumb) 0111 0xxx xxxx xxxx */
1381 /* LDRB (immediate, Thumb) 0111 1xxx xxxx xxxx */
1382 DECODE_EMULATE (0xc000, 0x4000, t16_emulate_loregs_rwflags),
1383 /* STRH (immediate, Thumb) 1000 0xxx xxxx xxxx */
1384 /* LDRH (immediate, Thumb) 1000 1xxx xxxx xxxx */
1385 DECODE_EMULATE (0xf000, 0x8000, t16_emulate_loregs_rwflags),
1386 /* STR (immediate, Thumb) 1001 0xxx xxxx xxxx */
1387 /* LDR (immediate, Thumb) 1001 1xxx xxxx xxxx */
1388 DECODE_SIMULATE (0xf000, 0x9000, t16_simulate_ldrstr_sp_relative),
1389
1390 /*
1391 * Generate PC-/SP-relative address
1392 * ADR (literal) 1010 0xxx xxxx xxxx
1393 * ADD (SP plus immediate) 1010 1xxx xxxx xxxx
1394 */
1395 DECODE_SIMULATE (0xf000, 0xa000, t16_simulate_reladr),
1396
1397 /*
1398 * Miscellaneous 16-bit instructions
1399 * 1011 xxxx xxxx xxxx
1400 */
1401 DECODE_TABLE (0xf000, 0xb000, t16_table_1011),
1402
1403 /* STM 1100 0xxx xxxx xxxx */
1404 /* LDM 1100 1xxx xxxx xxxx */
1405 DECODE_EMULATE (0xf000, 0xc000, t16_emulate_loregs_rwflags),
1406
1407 /*
1408 * Conditional branch, and Supervisor Call
1409 */
1410
1411 /* Permanently UNDEFINED 1101 1110 xxxx xxxx */
1412 /* SVC 1101 1111 xxxx xxxx */
1413 DECODE_REJECT (0xfe00, 0xde00),
1414
1415 /* Conditional branch 1101 xxxx xxxx xxxx */
1416 DECODE_CUSTOM (0xf000, 0xd000, t16_decode_cond_branch),
1417
1418 /*
1419 * Unconditional branch
1420 * B 1110 0xxx xxxx xxxx
1421 */
1422 DECODE_SIMULATE (0xf800, 0xe000, t16_simulate_branch),
1423
1424 DECODE_END
1425};
1426
1427static unsigned long __kprobes thumb_check_cc(unsigned long cpsr)
1428{
1429 if (unlikely(in_it_block(cpsr)))
1430 return kprobe_condition_checks[current_cond(cpsr)](cpsr);
1431 return true;
1432}
1433
1434static void __kprobes thumb16_singlestep(struct kprobe *p, struct pt_regs *regs)
1435{
1436 regs->ARM_pc += 2;
1437 p->ainsn.insn_handler(p, regs);
1438 regs->ARM_cpsr = it_advance(regs->ARM_cpsr);
1439}
1440
1441static void __kprobes thumb32_singlestep(struct kprobe *p, struct pt_regs *regs)
1442{
1443 regs->ARM_pc += 4;
1444 p->ainsn.insn_handler(p, regs);
1445 regs->ARM_cpsr = it_advance(regs->ARM_cpsr);
1446}
1447
1448enum kprobe_insn __kprobes
1449thumb16_kprobe_decode_insn(kprobe_opcode_t insn, struct arch_specific_insn *asi)
1450{
1451 asi->insn_singlestep = thumb16_singlestep;
1452 asi->insn_check_cc = thumb_check_cc;
1453 return kprobe_decode_insn(insn, asi, kprobe_decode_thumb16_table, true);
1454}
1455
1456enum kprobe_insn __kprobes
1457thumb32_kprobe_decode_insn(kprobe_opcode_t insn, struct arch_specific_insn *asi)
1458{
1459 asi->insn_singlestep = thumb32_singlestep;
1460 asi->insn_check_cc = thumb_check_cc;
1461 return kprobe_decode_insn(insn, asi, kprobe_decode_thumb32_table, true);
1462}
generated by cgit v1.2.2 (git 2.25.0) at 2024-09-27 03:21:18 -0400