2 * arch/arm/kernel/kprobes-thumb.c
4 * Copyright (C) 2011 Jon Medhurst <tixy@yxit.co.uk>.
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.
11 #include <linux/kernel.h>
12 #include <linux/kprobes.h>
18 * True if current instruction is in an IT block.
20 #define in_it_block(cpsr) ((cpsr & 0x06000c00) != 0x00000000)
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.
27 #define current_cond(cpsr) ((cpsr >> 12) & 0xf)
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.
35 static inline unsigned long __kprobes thumb_probe_pc(struct kprobe *p)
37 return (unsigned long)p->addr - 1 + 4;
41 t32_simulate_table_branch(struct kprobe *p, struct pt_regs *regs)
43 kprobe_opcode_t insn = p->opcode;
44 unsigned long pc = thumb_probe_pc(p);
45 int rn = (insn >> 16) & 0xf;
48 unsigned long rnv = (rn == 15) ? pc : regs->uregs[rn];
49 unsigned long rmv = regs->uregs[rm];
50 unsigned int halfwords;
52 if (insn & 0x10) /* TBH */
53 halfwords = ((u16 *)rnv)[rmv];
55 halfwords = ((u8 *)rnv)[rmv];
57 regs->ARM_pc = pc + 2 * halfwords;
61 t32_simulate_mrs(struct kprobe *p, struct pt_regs *regs)
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;
70 t32_simulate_cond_branch(struct kprobe *p, struct pt_regs *regs)
72 kprobe_opcode_t insn = p->opcode;
73 unsigned long pc = thumb_probe_pc(p);
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 */
81 regs->ARM_pc = pc + (offset * 2);
84 static enum kprobe_insn __kprobes
85 t32_decode_cond_branch(kprobe_opcode_t insn, struct arch_specific_insn *asi)
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;
94 t32_simulate_branch(struct kprobe *p, struct pt_regs *regs)
96 kprobe_opcode_t insn = p->opcode;
97 unsigned long pc = thumb_probe_pc(p);
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 */
106 offset ^= 0x00600000; /* Invert J1 and J2 */
108 if (insn & (1 << 14)) {
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;
118 regs->ARM_pc = pc + (offset * 2);
121 static enum kprobe_insn __kprobes
122 t32_decode_ldmstm(kprobe_opcode_t insn, struct arch_specific_insn *asi)
124 enum kprobe_insn ret = kprobe_decode_ldmstm(insn, asi);
126 /* Fixup modified instruction to have halfwords in correct order...*/
128 ((u16 *)asi->insn)[0] = insn >> 16;
129 ((u16 *)asi->insn)[1] = insn & 0xffff;
134 static void __kprobes
135 t32_emulate_ldrdstrd(struct kprobe *p, struct pt_regs *regs)
137 kprobe_opcode_t insn = p->opcode;
138 unsigned long pc = thumb_probe_pc(p) & ~3;
139 int rt1 = (insn >> 12) & 0xf;
140 int rt2 = (insn >> 8) & 0xf;
141 int rn = (insn >> 16) & 0xf;
143 register unsigned long rt1v asm("r0") = regs->uregs[rt1];
144 register unsigned long rt2v asm("r1") = regs->uregs[rt2];
145 register unsigned long rnv asm("r2") = (rn == 15) ? pc
148 __asm__ __volatile__ (
150 : "=r" (rt1v), "=r" (rt2v), "=r" (rnv)
151 : "0" (rt1v), "1" (rt2v), "2" (rnv), [fn] "r" (p->ainsn.insn_fn)
152 : "lr", "memory", "cc"
156 regs->uregs[rn] = rnv; /* Writeback base register */
157 regs->uregs[rt1] = rt1v;
158 regs->uregs[rt2] = rt2v;
161 static void __kprobes
162 t32_emulate_rd8rn16rm0_rwflags(struct kprobe *p, struct pt_regs *regs)
164 kprobe_opcode_t insn = p->opcode;
165 int rd = (insn >> 8) & 0xf;
166 int rn = (insn >> 16) & 0xf;
169 register unsigned long rdv asm("r1") = regs->uregs[rd];
170 register unsigned long rnv asm("r2") = regs->uregs[rn];
171 register unsigned long rmv asm("r3") = regs->uregs[rm];
172 unsigned long cpsr = regs->ARM_cpsr;
174 __asm__ __volatile__ (
175 "msr cpsr_fs, %[cpsr] \n\t"
177 "mrs %[cpsr], cpsr \n\t"
178 : "=r" (rdv), [cpsr] "=r" (cpsr)
179 : "0" (rdv), "r" (rnv), "r" (rmv),
180 "1" (cpsr), [fn] "r" (p->ainsn.insn_fn)
181 : "lr", "memory", "cc"
184 regs->uregs[rd] = rdv;
185 regs->ARM_cpsr = (regs->ARM_cpsr & ~APSR_MASK) | (cpsr & APSR_MASK);
188 static void __kprobes
189 t32_emulate_rd8pc16_noflags(struct kprobe *p, struct pt_regs *regs)
191 kprobe_opcode_t insn = p->opcode;
192 unsigned long pc = thumb_probe_pc(p);
193 int rd = (insn >> 8) & 0xf;
195 register unsigned long rdv asm("r1") = regs->uregs[rd];
196 register unsigned long rnv asm("r2") = pc & ~3;
198 __asm__ __volatile__ (
201 : "0" (rdv), "r" (rnv), [fn] "r" (p->ainsn.insn_fn)
202 : "lr", "memory", "cc"
205 regs->uregs[rd] = rdv;
208 static void __kprobes
209 t32_emulate_rd8rn16_noflags(struct kprobe *p, struct pt_regs *regs)
211 kprobe_opcode_t insn = p->opcode;
212 int rd = (insn >> 8) & 0xf;
213 int rn = (insn >> 16) & 0xf;
215 register unsigned long rdv asm("r1") = regs->uregs[rd];
216 register unsigned long rnv asm("r2") = regs->uregs[rn];
218 __asm__ __volatile__ (
221 : "0" (rdv), "r" (rnv), [fn] "r" (p->ainsn.insn_fn)
222 : "lr", "memory", "cc"
225 regs->uregs[rd] = rdv;
228 static const union decode_item t32_table_1110_100x_x0xx[] = {
229 /* Load/store multiple instructions */
231 /* Rn is PC 1110 100x x0xx 1111 xxxx xxxx xxxx xxxx */
232 DECODE_REJECT (0xfe4f0000, 0xe80f0000),
234 /* SRS 1110 1000 00x0 xxxx xxxx xxxx xxxx xxxx */
235 /* RFE 1110 1000 00x1 xxxx xxxx xxxx xxxx xxxx */
236 DECODE_REJECT (0xffc00000, 0xe8000000),
237 /* SRS 1110 1001 10x0 xxxx xxxx xxxx xxxx xxxx */
238 /* RFE 1110 1001 10x1 xxxx xxxx xxxx xxxx xxxx */
239 DECODE_REJECT (0xffc00000, 0xe9800000),
241 /* STM Rn, {...pc} 1110 100x x0x0 xxxx 1xxx xxxx xxxx xxxx */
242 DECODE_REJECT (0xfe508000, 0xe8008000),
243 /* LDM Rn, {...lr,pc} 1110 100x x0x1 xxxx 11xx xxxx xxxx xxxx */
244 DECODE_REJECT (0xfe50c000, 0xe810c000),
245 /* LDM/STM Rn, {...sp} 1110 100x x0xx xxxx xx1x xxxx xxxx xxxx */
246 DECODE_REJECT (0xfe402000, 0xe8002000),
248 /* STMIA 1110 1000 10x0 xxxx xxxx xxxx xxxx xxxx */
249 /* LDMIA 1110 1000 10x1 xxxx xxxx xxxx xxxx xxxx */
250 /* STMDB 1110 1001 00x0 xxxx xxxx xxxx xxxx xxxx */
251 /* LDMDB 1110 1001 00x1 xxxx xxxx xxxx xxxx xxxx */
252 DECODE_CUSTOM (0xfe400000, 0xe8000000, t32_decode_ldmstm),
257 static const union decode_item t32_table_1110_100x_x1xx[] = {
258 /* Load/store dual, load/store exclusive, table branch */
260 /* STRD (immediate) 1110 1000 x110 xxxx xxxx xxxx xxxx xxxx */
261 /* LDRD (immediate) 1110 1000 x111 xxxx xxxx xxxx xxxx xxxx */
262 DECODE_OR (0xff600000, 0xe8600000),
263 /* STRD (immediate) 1110 1001 x1x0 xxxx xxxx xxxx xxxx xxxx */
264 /* LDRD (immediate) 1110 1001 x1x1 xxxx xxxx xxxx xxxx xxxx */
265 DECODE_EMULATEX (0xff400000, 0xe9400000, t32_emulate_ldrdstrd,
266 REGS(NOPCWB, NOSPPC, NOSPPC, 0, 0)),
268 /* TBB 1110 1000 1101 xxxx xxxx xxxx 0000 xxxx */
269 /* TBH 1110 1000 1101 xxxx xxxx xxxx 0001 xxxx */
270 DECODE_SIMULATEX(0xfff000e0, 0xe8d00000, t32_simulate_table_branch,
271 REGS(NOSP, 0, 0, 0, NOSPPC)),
273 /* STREX 1110 1000 0100 xxxx xxxx xxxx xxxx xxxx */
274 /* LDREX 1110 1000 0101 xxxx xxxx xxxx xxxx xxxx */
275 /* STREXB 1110 1000 1100 xxxx xxxx xxxx 0100 xxxx */
276 /* STREXH 1110 1000 1100 xxxx xxxx xxxx 0101 xxxx */
277 /* STREXD 1110 1000 1100 xxxx xxxx xxxx 0111 xxxx */
278 /* LDREXB 1110 1000 1101 xxxx xxxx xxxx 0100 xxxx */
279 /* LDREXH 1110 1000 1101 xxxx xxxx xxxx 0101 xxxx */
280 /* LDREXD 1110 1000 1101 xxxx xxxx xxxx 0111 xxxx */
281 /* And unallocated instructions... */
285 static const union decode_item t32_table_1110_101x[] = {
286 /* Data-processing (shifted register) */
288 /* TST 1110 1010 0001 xxxx xxxx 1111 xxxx xxxx */
289 /* TEQ 1110 1010 1001 xxxx xxxx 1111 xxxx xxxx */
290 DECODE_EMULATEX (0xff700f00, 0xea100f00, t32_emulate_rd8rn16rm0_rwflags,
291 REGS(NOSPPC, 0, 0, 0, NOSPPC)),
293 /* CMN 1110 1011 0001 xxxx xxxx 1111 xxxx xxxx */
294 DECODE_OR (0xfff00f00, 0xeb100f00),
295 /* CMP 1110 1011 1011 xxxx xxxx 1111 xxxx xxxx */
296 DECODE_EMULATEX (0xfff00f00, 0xebb00f00, t32_emulate_rd8rn16rm0_rwflags,
297 REGS(NOPC, 0, 0, 0, NOSPPC)),
299 /* MOV 1110 1010 010x 1111 xxxx xxxx xxxx xxxx */
300 /* MVN 1110 1010 011x 1111 xxxx xxxx xxxx xxxx */
301 DECODE_EMULATEX (0xffcf0000, 0xea4f0000, t32_emulate_rd8rn16rm0_rwflags,
302 REGS(0, 0, NOSPPC, 0, NOSPPC)),
304 /* ??? 1110 1010 101x xxxx xxxx xxxx xxxx xxxx */
305 /* ??? 1110 1010 111x xxxx xxxx xxxx xxxx xxxx */
306 DECODE_REJECT (0xffa00000, 0xeaa00000),
307 /* ??? 1110 1011 001x xxxx xxxx xxxx xxxx xxxx */
308 DECODE_REJECT (0xffe00000, 0xeb200000),
309 /* ??? 1110 1011 100x xxxx xxxx xxxx xxxx xxxx */
310 DECODE_REJECT (0xffe00000, 0xeb800000),
311 /* ??? 1110 1011 111x xxxx xxxx xxxx xxxx xxxx */
312 DECODE_REJECT (0xffe00000, 0xebe00000),
314 /* ADD/SUB SP, SP, Rm, LSL #0..3 */
315 /* 1110 1011 x0xx 1101 x000 1101 xx00 xxxx */
316 DECODE_EMULATEX (0xff4f7f30, 0xeb0d0d00, t32_emulate_rd8rn16rm0_rwflags,
317 REGS(SP, 0, SP, 0, NOSPPC)),
319 /* ADD/SUB SP, SP, Rm, shift */
320 /* 1110 1011 x0xx 1101 xxxx 1101 xxxx xxxx */
321 DECODE_REJECT (0xff4f0f00, 0xeb0d0d00),
323 /* ADD/SUB Rd, SP, Rm, shift */
324 /* 1110 1011 x0xx 1101 xxxx xxxx xxxx xxxx */
325 DECODE_EMULATEX (0xff4f0000, 0xeb0d0000, t32_emulate_rd8rn16rm0_rwflags,
326 REGS(SP, 0, NOPC, 0, NOSPPC)),
328 /* AND 1110 1010 000x xxxx xxxx xxxx xxxx xxxx */
329 /* BIC 1110 1010 001x xxxx xxxx xxxx xxxx xxxx */
330 /* ORR 1110 1010 010x xxxx xxxx xxxx xxxx xxxx */
331 /* ORN 1110 1010 011x xxxx xxxx xxxx xxxx xxxx */
332 /* EOR 1110 1010 100x xxxx xxxx xxxx xxxx xxxx */
333 /* PKH 1110 1010 110x xxxx xxxx xxxx xxxx xxxx */
334 /* ADD 1110 1011 000x xxxx xxxx xxxx xxxx xxxx */
335 /* ADC 1110 1011 010x xxxx xxxx xxxx xxxx xxxx */
336 /* SBC 1110 1011 011x xxxx xxxx xxxx xxxx xxxx */
337 /* SUB 1110 1011 101x xxxx xxxx xxxx xxxx xxxx */
338 /* RSB 1110 1011 110x xxxx xxxx xxxx xxxx xxxx */
339 DECODE_EMULATEX (0xfe000000, 0xea000000, t32_emulate_rd8rn16rm0_rwflags,
340 REGS(NOSPPC, 0, NOSPPC, 0, NOSPPC)),
345 static const union decode_item t32_table_1111_0x0x___0[] = {
346 /* Data-processing (modified immediate) */
348 /* TST 1111 0x00 0001 xxxx 0xxx 1111 xxxx xxxx */
349 /* TEQ 1111 0x00 1001 xxxx 0xxx 1111 xxxx xxxx */
350 DECODE_EMULATEX (0xfb708f00, 0xf0100f00, t32_emulate_rd8rn16rm0_rwflags,
351 REGS(NOSPPC, 0, 0, 0, 0)),
353 /* CMN 1111 0x01 0001 xxxx 0xxx 1111 xxxx xxxx */
354 DECODE_OR (0xfbf08f00, 0xf1100f00),
355 /* CMP 1111 0x01 1011 xxxx 0xxx 1111 xxxx xxxx */
356 DECODE_EMULATEX (0xfbf08f00, 0xf1b00f00, t32_emulate_rd8rn16rm0_rwflags,
357 REGS(NOPC, 0, 0, 0, 0)),
359 /* MOV 1111 0x00 010x 1111 0xxx xxxx xxxx xxxx */
360 /* MVN 1111 0x00 011x 1111 0xxx xxxx xxxx xxxx */
361 DECODE_EMULATEX (0xfbcf8000, 0xf04f0000, t32_emulate_rd8rn16rm0_rwflags,
362 REGS(0, 0, NOSPPC, 0, 0)),
364 /* ??? 1111 0x00 101x xxxx 0xxx xxxx xxxx xxxx */
365 DECODE_REJECT (0xfbe08000, 0xf0a00000),
366 /* ??? 1111 0x00 110x xxxx 0xxx xxxx xxxx xxxx */
367 /* ??? 1111 0x00 111x xxxx 0xxx xxxx xxxx xxxx */
368 DECODE_REJECT (0xfbc08000, 0xf0c00000),
369 /* ??? 1111 0x01 001x xxxx 0xxx xxxx xxxx xxxx */
370 DECODE_REJECT (0xfbe08000, 0xf1200000),
371 /* ??? 1111 0x01 100x xxxx 0xxx xxxx xxxx xxxx */
372 DECODE_REJECT (0xfbe08000, 0xf1800000),
373 /* ??? 1111 0x01 111x xxxx 0xxx xxxx xxxx xxxx */
374 DECODE_REJECT (0xfbe08000, 0xf1e00000),
376 /* ADD Rd, SP, #imm 1111 0x01 000x 1101 0xxx xxxx xxxx xxxx */
377 /* SUB Rd, SP, #imm 1111 0x01 101x 1101 0xxx xxxx xxxx xxxx */
378 DECODE_EMULATEX (0xfb4f8000, 0xf10d0000, t32_emulate_rd8rn16rm0_rwflags,
379 REGS(SP, 0, NOPC, 0, 0)),
381 /* AND 1111 0x00 000x xxxx 0xxx xxxx xxxx xxxx */
382 /* BIC 1111 0x00 001x xxxx 0xxx xxxx xxxx xxxx */
383 /* ORR 1111 0x00 010x xxxx 0xxx xxxx xxxx xxxx */
384 /* ORN 1111 0x00 011x xxxx 0xxx xxxx xxxx xxxx */
385 /* EOR 1111 0x00 100x xxxx 0xxx xxxx xxxx xxxx */
386 /* ADD 1111 0x01 000x xxxx 0xxx xxxx xxxx xxxx */
387 /* ADC 1111 0x01 010x xxxx 0xxx xxxx xxxx xxxx */
388 /* SBC 1111 0x01 011x xxxx 0xxx xxxx xxxx xxxx */
389 /* SUB 1111 0x01 101x xxxx 0xxx xxxx xxxx xxxx */
390 /* RSB 1111 0x01 110x xxxx 0xxx xxxx xxxx xxxx */
391 DECODE_EMULATEX (0xfa008000, 0xf0000000, t32_emulate_rd8rn16rm0_rwflags,
392 REGS(NOSPPC, 0, NOSPPC, 0, 0)),
397 static const union decode_item t32_table_1111_0x1x___0[] = {
398 /* Data-processing (plain binary immediate) */
400 /* ADDW Rd, PC, #imm 1111 0x10 0000 1111 0xxx xxxx xxxx xxxx */
401 DECODE_OR (0xfbff8000, 0xf20f0000),
402 /* SUBW Rd, PC, #imm 1111 0x10 1010 1111 0xxx xxxx xxxx xxxx */
403 DECODE_EMULATEX (0xfbff8000, 0xf2af0000, t32_emulate_rd8pc16_noflags,
404 REGS(PC, 0, NOSPPC, 0, 0)),
406 /* ADDW SP, SP, #imm 1111 0x10 0000 1101 0xxx 1101 xxxx xxxx */
407 DECODE_OR (0xfbff8f00, 0xf20d0d00),
408 /* SUBW SP, SP, #imm 1111 0x10 1010 1101 0xxx 1101 xxxx xxxx */
409 DECODE_EMULATEX (0xfbff8f00, 0xf2ad0d00, t32_emulate_rd8rn16_noflags,
410 REGS(SP, 0, SP, 0, 0)),
412 /* ADDW 1111 0x10 0000 xxxx 0xxx xxxx xxxx xxxx */
413 DECODE_OR (0xfbf08000, 0xf2000000),
414 /* SUBW 1111 0x10 1010 xxxx 0xxx xxxx xxxx xxxx */
415 DECODE_EMULATEX (0xfbf08000, 0xf2a00000, t32_emulate_rd8rn16_noflags,
416 REGS(NOPCX, 0, NOSPPC, 0, 0)),
418 /* MOVW 1111 0x10 0100 xxxx 0xxx xxxx xxxx xxxx */
419 /* MOVT 1111 0x10 1100 xxxx 0xxx xxxx xxxx xxxx */
420 DECODE_EMULATEX (0xfb708000, 0xf2400000, t32_emulate_rd8rn16_noflags,
421 REGS(0, 0, NOSPPC, 0, 0)),
423 /* SSAT16 1111 0x11 0010 xxxx 0000 xxxx 00xx xxxx */
424 /* SSAT 1111 0x11 00x0 xxxx 0xxx xxxx xxxx xxxx */
425 /* USAT16 1111 0x11 1010 xxxx 0000 xxxx 00xx xxxx */
426 /* USAT 1111 0x11 10x0 xxxx 0xxx xxxx xxxx xxxx */
427 DECODE_EMULATEX (0xfb508000, 0xf3000000, t32_emulate_rd8rn16rm0_rwflags,
428 REGS(NOSPPC, 0, NOSPPC, 0, 0)),
430 /* SFBX 1111 0x11 0100 xxxx 0xxx xxxx xxxx xxxx */
431 /* UFBX 1111 0x11 1100 xxxx 0xxx xxxx xxxx xxxx */
432 DECODE_EMULATEX (0xfb708000, 0xf3400000, t32_emulate_rd8rn16_noflags,
433 REGS(NOSPPC, 0, NOSPPC, 0, 0)),
435 /* BFC 1111 0x11 0110 1111 0xxx xxxx xxxx xxxx */
436 DECODE_EMULATEX (0xfbff8000, 0xf36f0000, t32_emulate_rd8rn16_noflags,
437 REGS(0, 0, NOSPPC, 0, 0)),
439 /* BFI 1111 0x11 0110 xxxx 0xxx xxxx xxxx xxxx */
440 DECODE_EMULATEX (0xfbf08000, 0xf3600000, t32_emulate_rd8rn16_noflags,
441 REGS(NOSPPCX, 0, NOSPPC, 0, 0)),
446 static const union decode_item t32_table_1111_0xxx___1[] = {
447 /* Branches and miscellaneous control */
449 /* YIELD 1111 0011 1010 xxxx 10x0 x000 0000 0001 */
450 DECODE_OR (0xfff0d7ff, 0xf3a08001),
451 /* SEV 1111 0011 1010 xxxx 10x0 x000 0000 0100 */
452 DECODE_EMULATE (0xfff0d7ff, 0xf3a08004, kprobe_emulate_none),
453 /* NOP 1111 0011 1010 xxxx 10x0 x000 0000 0000 */
454 /* WFE 1111 0011 1010 xxxx 10x0 x000 0000 0010 */
455 /* WFI 1111 0011 1010 xxxx 10x0 x000 0000 0011 */
456 DECODE_SIMULATE (0xfff0d7fc, 0xf3a08000, kprobe_simulate_nop),
458 /* MRS Rd, CPSR 1111 0011 1110 xxxx 10x0 xxxx xxxx xxxx */
459 DECODE_SIMULATEX(0xfff0d000, 0xf3e08000, t32_simulate_mrs,
460 REGS(0, 0, NOSPPC, 0, 0)),
463 * Unsupported instructions
464 * 1111 0x11 1xxx xxxx 10x0 xxxx xxxx xxxx
466 * MSR 1111 0011 100x xxxx 10x0 xxxx xxxx xxxx
467 * DBG hint 1111 0011 1010 xxxx 10x0 x000 1111 xxxx
468 * Unallocated hints 1111 0011 1010 xxxx 10x0 x000 xxxx xxxx
469 * CPS 1111 0011 1010 xxxx 10x0 xxxx xxxx xxxx
470 * CLREX/DSB/DMB/ISB 1111 0011 1011 xxxx 10x0 xxxx xxxx xxxx
471 * BXJ 1111 0011 1100 xxxx 10x0 xxxx xxxx xxxx
472 * SUBS PC,LR,#<imm8> 1111 0011 1101 xxxx 10x0 xxxx xxxx xxxx
473 * MRS Rd, SPSR 1111 0011 1111 xxxx 10x0 xxxx xxxx xxxx
474 * SMC 1111 0111 1111 xxxx 1000 xxxx xxxx xxxx
475 * UNDEFINED 1111 0111 1111 xxxx 1010 xxxx xxxx xxxx
476 * ??? 1111 0111 1xxx xxxx 1010 xxxx xxxx xxxx
478 DECODE_REJECT (0xfb80d000, 0xf3808000),
480 /* Bcc 1111 0xxx xxxx xxxx 10x0 xxxx xxxx xxxx */
481 DECODE_CUSTOM (0xf800d000, 0xf0008000, t32_decode_cond_branch),
483 /* BLX 1111 0xxx xxxx xxxx 11x0 xxxx xxxx xxx0 */
484 DECODE_OR (0xf800d001, 0xf000c000),
485 /* B 1111 0xxx xxxx xxxx 10x1 xxxx xxxx xxxx */
486 /* BL 1111 0xxx xxxx xxxx 11x1 xxxx xxxx xxxx */
487 DECODE_SIMULATE (0xf8009000, 0xf0009000, t32_simulate_branch),
492 const union decode_item kprobe_decode_thumb32_table[] = {
495 * Load/store multiple instructions
496 * 1110 100x x0xx xxxx xxxx xxxx xxxx xxxx
498 DECODE_TABLE (0xfe400000, 0xe8000000, t32_table_1110_100x_x0xx),
501 * Load/store dual, load/store exclusive, table branch
502 * 1110 100x x1xx xxxx xxxx xxxx xxxx xxxx
504 DECODE_TABLE (0xfe400000, 0xe8400000, t32_table_1110_100x_x1xx),
507 * Data-processing (shifted register)
508 * 1110 101x xxxx xxxx xxxx xxxx xxxx xxxx
510 DECODE_TABLE (0xfe000000, 0xea000000, t32_table_1110_101x),
513 * Coprocessor instructions
514 * 1110 11xx xxxx xxxx xxxx xxxx xxxx xxxx
516 DECODE_REJECT (0xfc000000, 0xec000000),
519 * Data-processing (modified immediate)
520 * 1111 0x0x xxxx xxxx 0xxx xxxx xxxx xxxx
522 DECODE_TABLE (0xfa008000, 0xf0000000, t32_table_1111_0x0x___0),
525 * Data-processing (plain binary immediate)
526 * 1111 0x1x xxxx xxxx 0xxx xxxx xxxx xxxx
528 DECODE_TABLE (0xfa008000, 0xf2000000, t32_table_1111_0x1x___0),
531 * Branches and miscellaneous control
532 * 1111 0xxx xxxx xxxx 1xxx xxxx xxxx xxxx
534 DECODE_TABLE (0xf8008000, 0xf0008000, t32_table_1111_0xxx___1),
537 * Advanced SIMD element or structure load/store instructions
538 * 1111 1001 xxx0 xxxx xxxx xxxx xxxx xxxx
540 DECODE_REJECT (0xff100000, 0xf9000000),
543 * Coprocessor instructions
544 * 1111 11xx xxxx xxxx xxxx xxxx xxxx xxxx
549 static void __kprobes
550 t16_simulate_bxblx(struct kprobe *p, struct pt_regs *regs)
552 kprobe_opcode_t insn = p->opcode;
553 unsigned long pc = thumb_probe_pc(p);
554 int rm = (insn >> 3) & 0xf;
555 unsigned long rmv = (rm == 15) ? pc : regs->uregs[rm];
557 if (insn & (1 << 7)) /* BLX ? */
558 regs->ARM_lr = (unsigned long)p->addr + 2;
560 bx_write_pc(rmv, regs);
563 static void __kprobes
564 t16_simulate_ldr_literal(struct kprobe *p, struct pt_regs *regs)
566 kprobe_opcode_t insn = p->opcode;
567 unsigned long* base = (unsigned long *)(thumb_probe_pc(p) & ~3);
568 long index = insn & 0xff;
569 int rt = (insn >> 8) & 0x7;
570 regs->uregs[rt] = base[index];
573 static void __kprobes
574 t16_simulate_ldrstr_sp_relative(struct kprobe *p, struct pt_regs *regs)
576 kprobe_opcode_t insn = p->opcode;
577 unsigned long* base = (unsigned long *)regs->ARM_sp;
578 long index = insn & 0xff;
579 int rt = (insn >> 8) & 0x7;
580 if (insn & 0x800) /* LDR */
581 regs->uregs[rt] = base[index];
583 base[index] = regs->uregs[rt];
586 static void __kprobes
587 t16_simulate_reladr(struct kprobe *p, struct pt_regs *regs)
589 kprobe_opcode_t insn = p->opcode;
590 unsigned long base = (insn & 0x800) ? regs->ARM_sp
591 : (thumb_probe_pc(p) & ~3);
592 long offset = insn & 0xff;
593 int rt = (insn >> 8) & 0x7;
594 regs->uregs[rt] = base + offset * 4;
597 static void __kprobes
598 t16_simulate_add_sp_imm(struct kprobe *p, struct pt_regs *regs)
600 kprobe_opcode_t insn = p->opcode;
601 long imm = insn & 0x7f;
602 if (insn & 0x80) /* SUB */
603 regs->ARM_sp -= imm * 4;
605 regs->ARM_sp += imm * 4;
608 static void __kprobes
609 t16_simulate_cbz(struct kprobe *p, struct pt_regs *regs)
611 kprobe_opcode_t insn = p->opcode;
613 kprobe_opcode_t nonzero = regs->uregs[rn] ? insn : ~insn;
614 if (nonzero & 0x800) {
615 long i = insn & 0x200;
616 long imm5 = insn & 0xf8;
617 unsigned long pc = thumb_probe_pc(p);
618 regs->ARM_pc = pc + (i >> 3) + (imm5 >> 2);
622 static void __kprobes
623 t16_simulate_it(struct kprobe *p, struct pt_regs *regs)
626 * The 8 IT state bits are split into two parts in CPSR:
627 * ITSTATE<1:0> are in CPSR<26:25>
628 * ITSTATE<7:2> are in CPSR<15:10>
629 * The new IT state is in the lower byte of insn.
631 kprobe_opcode_t insn = p->opcode;
632 unsigned long cpsr = regs->ARM_cpsr;
633 cpsr &= ~PSR_IT_MASK;
634 cpsr |= (insn & 0xfc) << 8;
635 cpsr |= (insn & 0x03) << 25;
636 regs->ARM_cpsr = cpsr;
639 static void __kprobes
640 t16_singlestep_it(struct kprobe *p, struct pt_regs *regs)
643 t16_simulate_it(p, regs);
646 static enum kprobe_insn __kprobes
647 t16_decode_it(kprobe_opcode_t insn, struct arch_specific_insn *asi)
649 asi->insn_singlestep = t16_singlestep_it;
650 return INSN_GOOD_NO_SLOT;
653 static void __kprobes
654 t16_simulate_cond_branch(struct kprobe *p, struct pt_regs *regs)
656 kprobe_opcode_t insn = p->opcode;
657 unsigned long pc = thumb_probe_pc(p);
658 long offset = insn & 0x7f;
659 offset -= insn & 0x80; /* Apply sign bit */
660 regs->ARM_pc = pc + (offset * 2);
663 static enum kprobe_insn __kprobes
664 t16_decode_cond_branch(kprobe_opcode_t insn, struct arch_specific_insn *asi)
666 int cc = (insn >> 8) & 0xf;
667 asi->insn_check_cc = kprobe_condition_checks[cc];
668 asi->insn_handler = t16_simulate_cond_branch;
669 return INSN_GOOD_NO_SLOT;
672 static void __kprobes
673 t16_simulate_branch(struct kprobe *p, struct pt_regs *regs)
675 kprobe_opcode_t insn = p->opcode;
676 unsigned long pc = thumb_probe_pc(p);
677 long offset = insn & 0x3ff;
678 offset -= insn & 0x400; /* Apply sign bit */
679 regs->ARM_pc = pc + (offset * 2);
682 static unsigned long __kprobes
683 t16_emulate_loregs(struct kprobe *p, struct pt_regs *regs)
685 unsigned long oldcpsr = regs->ARM_cpsr;
686 unsigned long newcpsr;
688 __asm__ __volatile__ (
689 "msr cpsr_fs, %[oldcpsr] \n\t"
690 "ldmia %[regs], {r0-r7} \n\t"
692 "stmia %[regs], {r0-r7} \n\t"
693 "mrs %[newcpsr], cpsr \n\t"
694 : [newcpsr] "=r" (newcpsr)
695 : [oldcpsr] "r" (oldcpsr), [regs] "r" (regs),
696 [fn] "r" (p->ainsn.insn_fn)
697 : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
701 return (oldcpsr & ~APSR_MASK) | (newcpsr & APSR_MASK);
704 static void __kprobes
705 t16_emulate_loregs_rwflags(struct kprobe *p, struct pt_regs *regs)
707 regs->ARM_cpsr = t16_emulate_loregs(p, regs);
710 static void __kprobes
711 t16_emulate_loregs_noitrwflags(struct kprobe *p, struct pt_regs *regs)
713 unsigned long cpsr = t16_emulate_loregs(p, regs);
714 if (!in_it_block(cpsr))
715 regs->ARM_cpsr = cpsr;
718 static void __kprobes
719 t16_emulate_hiregs(struct kprobe *p, struct pt_regs *regs)
721 kprobe_opcode_t insn = p->opcode;
722 unsigned long pc = thumb_probe_pc(p);
723 int rdn = (insn & 0x7) | ((insn & 0x80) >> 4);
724 int rm = (insn >> 3) & 0xf;
726 register unsigned long rdnv asm("r1");
727 register unsigned long rmv asm("r0");
728 unsigned long cpsr = regs->ARM_cpsr;
730 rdnv = (rdn == 15) ? pc : regs->uregs[rdn];
731 rmv = (rm == 15) ? pc : regs->uregs[rm];
733 __asm__ __volatile__ (
734 "msr cpsr_fs, %[cpsr] \n\t"
736 "mrs %[cpsr], cpsr \n\t"
737 : "=r" (rdnv), [cpsr] "=r" (cpsr)
738 : "0" (rdnv), "r" (rmv), "1" (cpsr), [fn] "r" (p->ainsn.insn_fn)
739 : "lr", "memory", "cc"
745 regs->uregs[rdn] = rdnv;
746 regs->ARM_cpsr = (regs->ARM_cpsr & ~APSR_MASK) | (cpsr & APSR_MASK);
749 static enum kprobe_insn __kprobes
750 t16_decode_hiregs(kprobe_opcode_t insn, struct arch_specific_insn *asi)
753 insn |= 0x001; /* Set Rdn = R1 and Rm = R0 */
754 ((u16 *)asi->insn)[0] = insn;
755 asi->insn_handler = t16_emulate_hiregs;
759 static void __kprobes
760 t16_emulate_push(struct kprobe *p, struct pt_regs *regs)
762 __asm__ __volatile__ (
763 "ldr r9, [%[regs], #13*4] \n\t"
764 "ldr r8, [%[regs], #14*4] \n\t"
765 "ldmia %[regs], {r0-r7} \n\t"
767 "str r9, [%[regs], #13*4] \n\t"
769 : [regs] "r" (regs), [fn] "r" (p->ainsn.insn_fn)
770 : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9",
775 static enum kprobe_insn __kprobes
776 t16_decode_push(kprobe_opcode_t insn, struct arch_specific_insn *asi)
779 * To simulate a PUSH we use a Thumb-2 "STMDB R9!, {registers}"
780 * and call it with R9=SP and LR in the register list represented
783 ((u16 *)asi->insn)[0] = 0xe929; /* 1st half STMDB R9!,{} */
784 ((u16 *)asi->insn)[1] = insn & 0x1ff; /* 2nd half (register list) */
785 asi->insn_handler = t16_emulate_push;
789 static void __kprobes
790 t16_emulate_pop_nopc(struct kprobe *p, struct pt_regs *regs)
792 __asm__ __volatile__ (
793 "ldr r9, [%[regs], #13*4] \n\t"
794 "ldmia %[regs], {r0-r7} \n\t"
796 "stmia %[regs], {r0-r7} \n\t"
797 "str r9, [%[regs], #13*4] \n\t"
799 : [regs] "r" (regs), [fn] "r" (p->ainsn.insn_fn)
800 : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r9",
805 static void __kprobes
806 t16_emulate_pop_pc(struct kprobe *p, struct pt_regs *regs)
808 register unsigned long pc asm("r8");
810 __asm__ __volatile__ (
811 "ldr r9, [%[regs], #13*4] \n\t"
812 "ldmia %[regs], {r0-r7} \n\t"
814 "stmia %[regs], {r0-r7} \n\t"
815 "str r9, [%[regs], #13*4] \n\t"
817 : [regs] "r" (regs), [fn] "r" (p->ainsn.insn_fn)
818 : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r9",
822 bx_write_pc(pc, regs);
825 static enum kprobe_insn __kprobes
826 t16_decode_pop(kprobe_opcode_t insn, struct arch_specific_insn *asi)
829 * To simulate a POP we use a Thumb-2 "LDMDB R9!, {registers}"
830 * and call it with R9=SP and PC in the register list represented
833 ((u16 *)asi->insn)[0] = 0xe8b9; /* 1st half LDMIA R9!,{} */
834 ((u16 *)asi->insn)[1] = insn & 0x1ff; /* 2nd half (register list) */
835 asi->insn_handler = insn & 0x100 ? t16_emulate_pop_pc
836 : t16_emulate_pop_nopc;
840 static const union decode_item t16_table_1011[] = {
841 /* Miscellaneous 16-bit instructions */
843 /* ADD (SP plus immediate) 1011 0000 0xxx xxxx */
844 /* SUB (SP minus immediate) 1011 0000 1xxx xxxx */
845 DECODE_SIMULATE (0xff00, 0xb000, t16_simulate_add_sp_imm),
847 /* CBZ 1011 00x1 xxxx xxxx */
848 /* CBNZ 1011 10x1 xxxx xxxx */
849 DECODE_SIMULATE (0xf500, 0xb100, t16_simulate_cbz),
851 /* SXTH 1011 0010 00xx xxxx */
852 /* SXTB 1011 0010 01xx xxxx */
853 /* UXTH 1011 0010 10xx xxxx */
854 /* UXTB 1011 0010 11xx xxxx */
855 /* REV 1011 1010 00xx xxxx */
856 /* REV16 1011 1010 01xx xxxx */
857 /* ??? 1011 1010 10xx xxxx */
858 /* REVSH 1011 1010 11xx xxxx */
859 DECODE_REJECT (0xffc0, 0xba80),
860 DECODE_EMULATE (0xf500, 0xb000, t16_emulate_loregs_rwflags),
862 /* PUSH 1011 010x xxxx xxxx */
863 DECODE_CUSTOM (0xfe00, 0xb400, t16_decode_push),
864 /* POP 1011 110x xxxx xxxx */
865 DECODE_CUSTOM (0xfe00, 0xbc00, t16_decode_pop),
869 * 1011 1111 xxxx xxxx
872 /* YIELD 1011 1111 0001 0000 */
873 DECODE_OR (0xffff, 0xbf10),
874 /* SEV 1011 1111 0100 0000 */
875 DECODE_EMULATE (0xffff, 0xbf40, kprobe_emulate_none),
876 /* NOP 1011 1111 0000 0000 */
877 /* WFE 1011 1111 0010 0000 */
878 /* WFI 1011 1111 0011 0000 */
879 DECODE_SIMULATE (0xffcf, 0xbf00, kprobe_simulate_nop),
880 /* Unassigned hints 1011 1111 xxxx 0000 */
881 DECODE_REJECT (0xff0f, 0xbf00),
882 /* IT 1011 1111 xxxx xxxx */
883 DECODE_CUSTOM (0xff00, 0xbf00, t16_decode_it),
885 /* SETEND 1011 0110 010x xxxx */
886 /* CPS 1011 0110 011x xxxx */
887 /* BKPT 1011 1110 xxxx xxxx */
888 /* And unallocated instructions... */
892 const union decode_item kprobe_decode_thumb16_table[] = {
895 * Shift (immediate), add, subtract, move, and compare
896 * 00xx xxxx xxxx xxxx
899 /* CMP (immediate) 0010 1xxx xxxx xxxx */
900 DECODE_EMULATE (0xf800, 0x2800, t16_emulate_loregs_rwflags),
902 /* ADD (register) 0001 100x xxxx xxxx */
903 /* SUB (register) 0001 101x xxxx xxxx */
904 /* LSL (immediate) 0000 0xxx xxxx xxxx */
905 /* LSR (immediate) 0000 1xxx xxxx xxxx */
906 /* ASR (immediate) 0001 0xxx xxxx xxxx */
907 /* ADD (immediate, Thumb) 0001 110x xxxx xxxx */
908 /* SUB (immediate, Thumb) 0001 111x xxxx xxxx */
909 /* MOV (immediate) 0010 0xxx xxxx xxxx */
910 /* ADD (immediate, Thumb) 0011 0xxx xxxx xxxx */
911 /* SUB (immediate, Thumb) 0011 1xxx xxxx xxxx */
912 DECODE_EMULATE (0xc000, 0x0000, t16_emulate_loregs_noitrwflags),
915 * 16-bit Thumb data-processing instructions
916 * 0100 00xx xxxx xxxx
919 /* TST (register) 0100 0010 00xx xxxx */
920 DECODE_EMULATE (0xffc0, 0x4200, t16_emulate_loregs_rwflags),
921 /* CMP (register) 0100 0010 10xx xxxx */
922 /* CMN (register) 0100 0010 11xx xxxx */
923 DECODE_EMULATE (0xff80, 0x4280, t16_emulate_loregs_rwflags),
924 /* AND (register) 0100 0000 00xx xxxx */
925 /* EOR (register) 0100 0000 01xx xxxx */
926 /* LSL (register) 0100 0000 10xx xxxx */
927 /* LSR (register) 0100 0000 11xx xxxx */
928 /* ASR (register) 0100 0001 00xx xxxx */
929 /* ADC (register) 0100 0001 01xx xxxx */
930 /* SBC (register) 0100 0001 10xx xxxx */
931 /* ROR (register) 0100 0001 11xx xxxx */
932 /* RSB (immediate) 0100 0010 01xx xxxx */
933 /* ORR (register) 0100 0011 00xx xxxx */
934 /* MUL 0100 0011 00xx xxxx */
935 /* BIC (register) 0100 0011 10xx xxxx */
936 /* MVN (register) 0100 0011 10xx xxxx */
937 DECODE_EMULATE (0xfc00, 0x4000, t16_emulate_loregs_noitrwflags),
940 * Special data instructions and branch and exchange
941 * 0100 01xx xxxx xxxx
944 /* BLX pc 0100 0111 1111 1xxx */
945 DECODE_REJECT (0xfff8, 0x47f8),
947 /* BX (register) 0100 0111 0xxx xxxx */
948 /* BLX (register) 0100 0111 1xxx xxxx */
949 DECODE_SIMULATE (0xff00, 0x4700, t16_simulate_bxblx),
951 /* ADD pc, pc 0100 0100 1111 1111 */
952 DECODE_REJECT (0xffff, 0x44ff),
954 /* ADD (register) 0100 0100 xxxx xxxx */
955 /* CMP (register) 0100 0101 xxxx xxxx */
956 /* MOV (register) 0100 0110 xxxx xxxx */
957 DECODE_CUSTOM (0xfc00, 0x4400, t16_decode_hiregs),
960 * Load from Literal Pool
961 * LDR (literal) 0100 1xxx xxxx xxxx
963 DECODE_SIMULATE (0xf800, 0x4800, t16_simulate_ldr_literal),
966 * 16-bit Thumb Load/store instructions
967 * 0101 xxxx xxxx xxxx
968 * 011x xxxx xxxx xxxx
969 * 100x xxxx xxxx xxxx
972 /* STR (register) 0101 000x xxxx xxxx */
973 /* STRH (register) 0101 001x xxxx xxxx */
974 /* STRB (register) 0101 010x xxxx xxxx */
975 /* LDRSB (register) 0101 011x xxxx xxxx */
976 /* LDR (register) 0101 100x xxxx xxxx */
977 /* LDRH (register) 0101 101x xxxx xxxx */
978 /* LDRB (register) 0101 110x xxxx xxxx */
979 /* LDRSH (register) 0101 111x xxxx xxxx */
980 /* STR (immediate, Thumb) 0110 0xxx xxxx xxxx */
981 /* LDR (immediate, Thumb) 0110 1xxx xxxx xxxx */
982 /* STRB (immediate, Thumb) 0111 0xxx xxxx xxxx */
983 /* LDRB (immediate, Thumb) 0111 1xxx xxxx xxxx */
984 DECODE_EMULATE (0xc000, 0x4000, t16_emulate_loregs_rwflags),
985 /* STRH (immediate, Thumb) 1000 0xxx xxxx xxxx */
986 /* LDRH (immediate, Thumb) 1000 1xxx xxxx xxxx */
987 DECODE_EMULATE (0xf000, 0x8000, t16_emulate_loregs_rwflags),
988 /* STR (immediate, Thumb) 1001 0xxx xxxx xxxx */
989 /* LDR (immediate, Thumb) 1001 1xxx xxxx xxxx */
990 DECODE_SIMULATE (0xf000, 0x9000, t16_simulate_ldrstr_sp_relative),
993 * Generate PC-/SP-relative address
994 * ADR (literal) 1010 0xxx xxxx xxxx
995 * ADD (SP plus immediate) 1010 1xxx xxxx xxxx
997 DECODE_SIMULATE (0xf000, 0xa000, t16_simulate_reladr),
1000 * Miscellaneous 16-bit instructions
1001 * 1011 xxxx xxxx xxxx
1003 DECODE_TABLE (0xf000, 0xb000, t16_table_1011),
1005 /* STM 1100 0xxx xxxx xxxx */
1006 /* LDM 1100 1xxx xxxx xxxx */
1007 DECODE_EMULATE (0xf000, 0xc000, t16_emulate_loregs_rwflags),
1010 * Conditional branch, and Supervisor Call
1013 /* Permanently UNDEFINED 1101 1110 xxxx xxxx */
1014 /* SVC 1101 1111 xxxx xxxx */
1015 DECODE_REJECT (0xfe00, 0xde00),
1017 /* Conditional branch 1101 xxxx xxxx xxxx */
1018 DECODE_CUSTOM (0xf000, 0xd000, t16_decode_cond_branch),
1021 * Unconditional branch
1022 * B 1110 0xxx xxxx xxxx
1024 DECODE_SIMULATE (0xf800, 0xe000, t16_simulate_branch),
1029 static unsigned long __kprobes thumb_check_cc(unsigned long cpsr)
1031 if (unlikely(in_it_block(cpsr)))
1032 return kprobe_condition_checks[current_cond(cpsr)](cpsr);
1036 static void __kprobes thumb16_singlestep(struct kprobe *p, struct pt_regs *regs)
1039 p->ainsn.insn_handler(p, regs);
1040 regs->ARM_cpsr = it_advance(regs->ARM_cpsr);
1043 static void __kprobes thumb32_singlestep(struct kprobe *p, struct pt_regs *regs)
1046 p->ainsn.insn_handler(p, regs);
1047 regs->ARM_cpsr = it_advance(regs->ARM_cpsr);
1050 enum kprobe_insn __kprobes
1051 thumb16_kprobe_decode_insn(kprobe_opcode_t insn, struct arch_specific_insn *asi)
1053 asi->insn_singlestep = thumb16_singlestep;
1054 asi->insn_check_cc = thumb_check_cc;
1055 return kprobe_decode_insn(insn, asi, kprobe_decode_thumb16_table, true);
1058 enum kprobe_insn __kprobes
1059 thumb32_kprobe_decode_insn(kprobe_opcode_t insn, struct arch_specific_insn *asi)
1061 asi->insn_singlestep = thumb32_singlestep;
1062 asi->insn_check_cc = thumb_check_cc;
1063 return kprobe_decode_insn(insn, asi, kprobe_decode_thumb32_table, true);