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c18377c3 DL |
1 | /* |
2 | * arch/arm/kernel/probes-arm.c | |
3 | * | |
4 | * Some code moved here from arch/arm/kernel/kprobes-arm.c | |
5 | * | |
6 | * Copyright (C) 2006, 2007 Motorola Inc. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | */ | |
17 | ||
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/stddef.h> | |
21 | #include <linux/ptrace.h> | |
c18377c3 | 22 | |
7579f4b3 | 23 | #include "probes.h" |
c18377c3 DL |
24 | #include "probes-arm.h" |
25 | ||
26 | #define sign_extend(x, signbit) ((x) | (0 - ((x) & (1 << (signbit))))) | |
27 | ||
28 | #define branch_displacement(insn) sign_extend(((insn) & 0xffffff) << 2, 25) | |
29 | ||
30 | /* | |
31 | * To avoid the complications of mimicing single-stepping on a | |
32 | * processor without a Next-PC or a single-step mode, and to | |
33 | * avoid having to deal with the side-effects of boosting, we | |
34 | * simulate or emulate (almost) all ARM instructions. | |
35 | * | |
36 | * "Simulation" is where the instruction's behavior is duplicated in | |
37 | * C code. "Emulation" is where the original instruction is rewritten | |
38 | * and executed, often by altering its registers. | |
39 | * | |
40 | * By having all behavior of the kprobe'd instruction completed before | |
41 | * returning from the kprobe_handler(), all locks (scheduler and | |
42 | * interrupt) can safely be released. There is no need for secondary | |
43 | * breakpoints, no race with MP or preemptable kernels, nor having to | |
44 | * clean up resources counts at a later time impacting overall system | |
45 | * performance. By rewriting the instruction, only the minimum registers | |
46 | * need to be loaded and saved back optimizing performance. | |
47 | * | |
48 | * Calling the insnslot_*_rwflags version of a function doesn't hurt | |
49 | * anything even when the CPSR flags aren't updated by the | |
50 | * instruction. It's just a little slower in return for saving | |
51 | * a little space by not having a duplicate function that doesn't | |
52 | * update the flags. (The same optimization can be said for | |
53 | * instructions that do or don't perform register writeback) | |
54 | * Also, instructions can either read the flags, only write the | |
55 | * flags, or read and write the flags. To save combinations | |
56 | * rather than for sheer performance, flag functions just assume | |
57 | * read and write of flags. | |
58 | */ | |
59 | ||
f145d664 | 60 | void __kprobes simulate_bbl(probes_opcode_t insn, |
7579f4b3 | 61 | struct arch_specific_insn *asi, struct pt_regs *regs) |
c18377c3 | 62 | { |
7579f4b3 | 63 | long iaddr = (long) regs->ARM_pc - 4; |
c18377c3 DL |
64 | int disp = branch_displacement(insn); |
65 | ||
66 | if (insn & (1 << 24)) | |
67 | regs->ARM_lr = iaddr + 4; | |
68 | ||
69 | regs->ARM_pc = iaddr + 8 + disp; | |
70 | } | |
71 | ||
f145d664 | 72 | void __kprobes simulate_blx1(probes_opcode_t insn, |
7579f4b3 | 73 | struct arch_specific_insn *asi, struct pt_regs *regs) |
c18377c3 | 74 | { |
7579f4b3 | 75 | long iaddr = (long) regs->ARM_pc - 4; |
c18377c3 DL |
76 | int disp = branch_displacement(insn); |
77 | ||
78 | regs->ARM_lr = iaddr + 4; | |
79 | regs->ARM_pc = iaddr + 8 + disp + ((insn >> 23) & 0x2); | |
80 | regs->ARM_cpsr |= PSR_T_BIT; | |
81 | } | |
82 | ||
f145d664 | 83 | void __kprobes simulate_blx2bx(probes_opcode_t insn, |
7579f4b3 | 84 | struct arch_specific_insn *asi, struct pt_regs *regs) |
c18377c3 | 85 | { |
c18377c3 DL |
86 | int rm = insn & 0xf; |
87 | long rmv = regs->uregs[rm]; | |
88 | ||
89 | if (insn & (1 << 5)) | |
7579f4b3 | 90 | regs->ARM_lr = (long) regs->ARM_pc; |
c18377c3 DL |
91 | |
92 | regs->ARM_pc = rmv & ~0x1; | |
93 | regs->ARM_cpsr &= ~PSR_T_BIT; | |
94 | if (rmv & 0x1) | |
95 | regs->ARM_cpsr |= PSR_T_BIT; | |
96 | } | |
97 | ||
f145d664 | 98 | void __kprobes simulate_mrs(probes_opcode_t insn, |
7579f4b3 | 99 | struct arch_specific_insn *asi, struct pt_regs *regs) |
c18377c3 | 100 | { |
c18377c3 DL |
101 | int rd = (insn >> 12) & 0xf; |
102 | unsigned long mask = 0xf8ff03df; /* Mask out execution state */ | |
103 | regs->uregs[rd] = regs->ARM_cpsr & mask; | |
104 | } | |
105 | ||
f145d664 | 106 | void __kprobes simulate_mov_ipsp(probes_opcode_t insn, |
7579f4b3 | 107 | struct arch_specific_insn *asi, struct pt_regs *regs) |
c18377c3 DL |
108 | { |
109 | regs->uregs[12] = regs->uregs[13]; | |
110 | } | |
111 | ||
112 | /* | |
113 | * For the instruction masking and comparisons in all the "space_*" | |
114 | * functions below, Do _not_ rearrange the order of tests unless | |
115 | * you're very, very sure of what you are doing. For the sake of | |
116 | * efficiency, the masks for some tests sometimes assume other test | |
117 | * have been done prior to them so the number of patterns to test | |
118 | * for an instruction set can be as broad as possible to reduce the | |
119 | * number of tests needed. | |
120 | */ | |
121 | ||
122 | static const union decode_item arm_1111_table[] = { | |
123 | /* Unconditional instructions */ | |
124 | ||
125 | /* memory hint 1111 0100 x001 xxxx xxxx xxxx xxxx xxxx */ | |
126 | /* PLDI (immediate) 1111 0100 x101 xxxx xxxx xxxx xxxx xxxx */ | |
127 | /* PLDW (immediate) 1111 0101 x001 xxxx xxxx xxxx xxxx xxxx */ | |
128 | /* PLD (immediate) 1111 0101 x101 xxxx xxxx xxxx xxxx xxxx */ | |
3e6cd394 | 129 | DECODE_SIMULATE (0xfe300000, 0xf4100000, PROBES_PRELOAD_IMM), |
c18377c3 DL |
130 | |
131 | /* memory hint 1111 0110 x001 xxxx xxxx xxxx xxx0 xxxx */ | |
132 | /* PLDI (register) 1111 0110 x101 xxxx xxxx xxxx xxx0 xxxx */ | |
133 | /* PLDW (register) 1111 0111 x001 xxxx xxxx xxxx xxx0 xxxx */ | |
134 | /* PLD (register) 1111 0111 x101 xxxx xxxx xxxx xxx0 xxxx */ | |
3e6cd394 | 135 | DECODE_SIMULATE (0xfe300010, 0xf6100000, PROBES_PRELOAD_REG), |
c18377c3 DL |
136 | |
137 | /* BLX (immediate) 1111 101x xxxx xxxx xxxx xxxx xxxx xxxx */ | |
3e6cd394 | 138 | DECODE_SIMULATE (0xfe000000, 0xfa000000, PROBES_BRANCH_IMM), |
c18377c3 DL |
139 | |
140 | /* CPS 1111 0001 0000 xxx0 xxxx xxxx xx0x xxxx */ | |
141 | /* SETEND 1111 0001 0000 0001 xxxx xxxx 0000 xxxx */ | |
142 | /* SRS 1111 100x x1x0 xxxx xxxx xxxx xxxx xxxx */ | |
143 | /* RFE 1111 100x x0x1 xxxx xxxx xxxx xxxx xxxx */ | |
144 | ||
145 | /* Coprocessor instructions... */ | |
146 | /* MCRR2 1111 1100 0100 xxxx xxxx xxxx xxxx xxxx */ | |
147 | /* MRRC2 1111 1100 0101 xxxx xxxx xxxx xxxx xxxx */ | |
148 | /* LDC2 1111 110x xxx1 xxxx xxxx xxxx xxxx xxxx */ | |
149 | /* STC2 1111 110x xxx0 xxxx xxxx xxxx xxxx xxxx */ | |
150 | /* CDP2 1111 1110 xxxx xxxx xxxx xxxx xxx0 xxxx */ | |
151 | /* MCR2 1111 1110 xxx0 xxxx xxxx xxxx xxx1 xxxx */ | |
152 | /* MRC2 1111 1110 xxx1 xxxx xxxx xxxx xxx1 xxxx */ | |
153 | ||
154 | /* Other unallocated instructions... */ | |
155 | DECODE_END | |
156 | }; | |
157 | ||
158 | static const union decode_item arm_cccc_0001_0xx0____0xxx_table[] = { | |
159 | /* Miscellaneous instructions */ | |
160 | ||
161 | /* MRS cpsr cccc 0001 0000 xxxx xxxx xxxx 0000 xxxx */ | |
3e6cd394 | 162 | DECODE_SIMULATEX(0x0ff000f0, 0x01000000, PROBES_MRS, |
c18377c3 DL |
163 | REGS(0, NOPC, 0, 0, 0)), |
164 | ||
165 | /* BX cccc 0001 0010 xxxx xxxx xxxx 0001 xxxx */ | |
3e6cd394 | 166 | DECODE_SIMULATE (0x0ff000f0, 0x01200010, PROBES_BRANCH_REG), |
c18377c3 DL |
167 | |
168 | /* BLX (register) cccc 0001 0010 xxxx xxxx xxxx 0011 xxxx */ | |
3e6cd394 | 169 | DECODE_SIMULATEX(0x0ff000f0, 0x01200030, PROBES_BRANCH_REG, |
c18377c3 DL |
170 | REGS(0, 0, 0, 0, NOPC)), |
171 | ||
172 | /* CLZ cccc 0001 0110 xxxx xxxx xxxx 0001 xxxx */ | |
3e6cd394 | 173 | DECODE_EMULATEX (0x0ff000f0, 0x01600010, PROBES_CLZ, |
c18377c3 DL |
174 | REGS(0, NOPC, 0, 0, NOPC)), |
175 | ||
176 | /* QADD cccc 0001 0000 xxxx xxxx xxxx 0101 xxxx */ | |
177 | /* QSUB cccc 0001 0010 xxxx xxxx xxxx 0101 xxxx */ | |
178 | /* QDADD cccc 0001 0100 xxxx xxxx xxxx 0101 xxxx */ | |
179 | /* QDSUB cccc 0001 0110 xxxx xxxx xxxx 0101 xxxx */ | |
3e6cd394 | 180 | DECODE_EMULATEX (0x0f9000f0, 0x01000050, PROBES_SATURATING_ARITHMETIC, |
c18377c3 DL |
181 | REGS(NOPC, NOPC, 0, 0, NOPC)), |
182 | ||
183 | /* BXJ cccc 0001 0010 xxxx xxxx xxxx 0010 xxxx */ | |
184 | /* MSR cccc 0001 0x10 xxxx xxxx xxxx 0000 xxxx */ | |
185 | /* MRS spsr cccc 0001 0100 xxxx xxxx xxxx 0000 xxxx */ | |
186 | /* BKPT 1110 0001 0010 xxxx xxxx xxxx 0111 xxxx */ | |
187 | /* SMC cccc 0001 0110 xxxx xxxx xxxx 0111 xxxx */ | |
188 | /* And unallocated instructions... */ | |
189 | DECODE_END | |
190 | }; | |
191 | ||
192 | static const union decode_item arm_cccc_0001_0xx0____1xx0_table[] = { | |
193 | /* Halfword multiply and multiply-accumulate */ | |
194 | ||
195 | /* SMLALxy cccc 0001 0100 xxxx xxxx xxxx 1xx0 xxxx */ | |
3e6cd394 | 196 | DECODE_EMULATEX (0x0ff00090, 0x01400080, PROBES_MUL1, |
c18377c3 DL |
197 | REGS(NOPC, NOPC, NOPC, 0, NOPC)), |
198 | ||
199 | /* SMULWy cccc 0001 0010 xxxx xxxx xxxx 1x10 xxxx */ | |
200 | DECODE_OR (0x0ff000b0, 0x012000a0), | |
201 | /* SMULxy cccc 0001 0110 xxxx xxxx xxxx 1xx0 xxxx */ | |
3e6cd394 | 202 | DECODE_EMULATEX (0x0ff00090, 0x01600080, PROBES_MUL2, |
c18377c3 DL |
203 | REGS(NOPC, 0, NOPC, 0, NOPC)), |
204 | ||
205 | /* SMLAxy cccc 0001 0000 xxxx xxxx xxxx 1xx0 xxxx */ | |
206 | DECODE_OR (0x0ff00090, 0x01000080), | |
207 | /* SMLAWy cccc 0001 0010 xxxx xxxx xxxx 1x00 xxxx */ | |
3e6cd394 | 208 | DECODE_EMULATEX (0x0ff000b0, 0x01200080, PROBES_MUL2, |
c18377c3 DL |
209 | REGS(NOPC, NOPC, NOPC, 0, NOPC)), |
210 | ||
211 | DECODE_END | |
212 | }; | |
213 | ||
214 | static const union decode_item arm_cccc_0000_____1001_table[] = { | |
215 | /* Multiply and multiply-accumulate */ | |
216 | ||
217 | /* MUL cccc 0000 0000 xxxx xxxx xxxx 1001 xxxx */ | |
218 | /* MULS cccc 0000 0001 xxxx xxxx xxxx 1001 xxxx */ | |
3e6cd394 | 219 | DECODE_EMULATEX (0x0fe000f0, 0x00000090, PROBES_MUL2, |
c18377c3 DL |
220 | REGS(NOPC, 0, NOPC, 0, NOPC)), |
221 | ||
222 | /* MLA cccc 0000 0010 xxxx xxxx xxxx 1001 xxxx */ | |
223 | /* MLAS cccc 0000 0011 xxxx xxxx xxxx 1001 xxxx */ | |
224 | DECODE_OR (0x0fe000f0, 0x00200090), | |
225 | /* MLS cccc 0000 0110 xxxx xxxx xxxx 1001 xxxx */ | |
3e6cd394 | 226 | DECODE_EMULATEX (0x0ff000f0, 0x00600090, PROBES_MUL2, |
c18377c3 DL |
227 | REGS(NOPC, NOPC, NOPC, 0, NOPC)), |
228 | ||
229 | /* UMAAL cccc 0000 0100 xxxx xxxx xxxx 1001 xxxx */ | |
230 | DECODE_OR (0x0ff000f0, 0x00400090), | |
231 | /* UMULL cccc 0000 1000 xxxx xxxx xxxx 1001 xxxx */ | |
232 | /* UMULLS cccc 0000 1001 xxxx xxxx xxxx 1001 xxxx */ | |
233 | /* UMLAL cccc 0000 1010 xxxx xxxx xxxx 1001 xxxx */ | |
234 | /* UMLALS cccc 0000 1011 xxxx xxxx xxxx 1001 xxxx */ | |
235 | /* SMULL cccc 0000 1100 xxxx xxxx xxxx 1001 xxxx */ | |
236 | /* SMULLS cccc 0000 1101 xxxx xxxx xxxx 1001 xxxx */ | |
237 | /* SMLAL cccc 0000 1110 xxxx xxxx xxxx 1001 xxxx */ | |
238 | /* SMLALS cccc 0000 1111 xxxx xxxx xxxx 1001 xxxx */ | |
3e6cd394 | 239 | DECODE_EMULATEX (0x0f8000f0, 0x00800090, PROBES_MUL1, |
c18377c3 DL |
240 | REGS(NOPC, NOPC, NOPC, 0, NOPC)), |
241 | ||
242 | DECODE_END | |
243 | }; | |
244 | ||
245 | static const union decode_item arm_cccc_0001_____1001_table[] = { | |
246 | /* Synchronization primitives */ | |
247 | ||
248 | #if __LINUX_ARM_ARCH__ < 6 | |
249 | /* Deprecated on ARMv6 and may be UNDEFINED on v7 */ | |
250 | /* SMP/SWPB cccc 0001 0x00 xxxx xxxx xxxx 1001 xxxx */ | |
3e6cd394 | 251 | DECODE_EMULATEX (0x0fb000f0, 0x01000090, PROBES_SWP, |
c18377c3 DL |
252 | REGS(NOPC, NOPC, 0, 0, NOPC)), |
253 | #endif | |
254 | /* LDREX/STREX{,D,B,H} cccc 0001 1xxx xxxx xxxx xxxx 1001 xxxx */ | |
255 | /* And unallocated instructions... */ | |
256 | DECODE_END | |
257 | }; | |
258 | ||
259 | static const union decode_item arm_cccc_000x_____1xx1_table[] = { | |
260 | /* Extra load/store instructions */ | |
261 | ||
262 | /* STRHT cccc 0000 xx10 xxxx xxxx xxxx 1011 xxxx */ | |
263 | /* ??? cccc 0000 xx10 xxxx xxxx xxxx 11x1 xxxx */ | |
264 | /* LDRHT cccc 0000 xx11 xxxx xxxx xxxx 1011 xxxx */ | |
265 | /* LDRSBT cccc 0000 xx11 xxxx xxxx xxxx 1101 xxxx */ | |
266 | /* LDRSHT cccc 0000 xx11 xxxx xxxx xxxx 1111 xxxx */ | |
267 | DECODE_REJECT (0x0f200090, 0x00200090), | |
268 | ||
269 | /* LDRD/STRD lr,pc,{... cccc 000x x0x0 xxxx 111x xxxx 1101 xxxx */ | |
270 | DECODE_REJECT (0x0e10e0d0, 0x0000e0d0), | |
271 | ||
272 | /* LDRD (register) cccc 000x x0x0 xxxx xxxx xxxx 1101 xxxx */ | |
273 | /* STRD (register) cccc 000x x0x0 xxxx xxxx xxxx 1111 xxxx */ | |
3e6cd394 | 274 | DECODE_EMULATEX (0x0e5000d0, 0x000000d0, PROBES_LDRSTRD, |
c18377c3 DL |
275 | REGS(NOPCWB, NOPCX, 0, 0, NOPC)), |
276 | ||
277 | /* LDRD (immediate) cccc 000x x1x0 xxxx xxxx xxxx 1101 xxxx */ | |
278 | /* STRD (immediate) cccc 000x x1x0 xxxx xxxx xxxx 1111 xxxx */ | |
3e6cd394 | 279 | DECODE_EMULATEX (0x0e5000d0, 0x004000d0, PROBES_LDRSTRD, |
c18377c3 DL |
280 | REGS(NOPCWB, NOPCX, 0, 0, 0)), |
281 | ||
282 | /* STRH (register) cccc 000x x0x0 xxxx xxxx xxxx 1011 xxxx */ | |
3e6cd394 | 283 | DECODE_EMULATEX (0x0e5000f0, 0x000000b0, PROBES_STORE_EXTRA, |
c18377c3 DL |
284 | REGS(NOPCWB, NOPC, 0, 0, NOPC)), |
285 | ||
286 | /* LDRH (register) cccc 000x x0x1 xxxx xxxx xxxx 1011 xxxx */ | |
287 | /* LDRSB (register) cccc 000x x0x1 xxxx xxxx xxxx 1101 xxxx */ | |
288 | /* LDRSH (register) cccc 000x x0x1 xxxx xxxx xxxx 1111 xxxx */ | |
3e6cd394 | 289 | DECODE_EMULATEX (0x0e500090, 0x00100090, PROBES_LOAD_EXTRA, |
c18377c3 DL |
290 | REGS(NOPCWB, NOPC, 0, 0, NOPC)), |
291 | ||
292 | /* STRH (immediate) cccc 000x x1x0 xxxx xxxx xxxx 1011 xxxx */ | |
3e6cd394 | 293 | DECODE_EMULATEX (0x0e5000f0, 0x004000b0, PROBES_STORE_EXTRA, |
c18377c3 DL |
294 | REGS(NOPCWB, NOPC, 0, 0, 0)), |
295 | ||
296 | /* LDRH (immediate) cccc 000x x1x1 xxxx xxxx xxxx 1011 xxxx */ | |
297 | /* LDRSB (immediate) cccc 000x x1x1 xxxx xxxx xxxx 1101 xxxx */ | |
298 | /* LDRSH (immediate) cccc 000x x1x1 xxxx xxxx xxxx 1111 xxxx */ | |
3e6cd394 | 299 | DECODE_EMULATEX (0x0e500090, 0x00500090, PROBES_LOAD_EXTRA, |
c18377c3 DL |
300 | REGS(NOPCWB, NOPC, 0, 0, 0)), |
301 | ||
302 | DECODE_END | |
303 | }; | |
304 | ||
305 | static const union decode_item arm_cccc_000x_table[] = { | |
306 | /* Data-processing (register) */ | |
307 | ||
308 | /* <op>S PC, ... cccc 000x xxx1 xxxx 1111 xxxx xxxx xxxx */ | |
309 | DECODE_REJECT (0x0e10f000, 0x0010f000), | |
310 | ||
311 | /* MOV IP, SP 1110 0001 1010 0000 1100 0000 0000 1101 */ | |
3e6cd394 | 312 | DECODE_SIMULATE (0xffffffff, 0xe1a0c00d, PROBES_MOV_IP_SP), |
c18377c3 DL |
313 | |
314 | /* TST (register) cccc 0001 0001 xxxx xxxx xxxx xxx0 xxxx */ | |
315 | /* TEQ (register) cccc 0001 0011 xxxx xxxx xxxx xxx0 xxxx */ | |
316 | /* CMP (register) cccc 0001 0101 xxxx xxxx xxxx xxx0 xxxx */ | |
317 | /* CMN (register) cccc 0001 0111 xxxx xxxx xxxx xxx0 xxxx */ | |
3e6cd394 | 318 | DECODE_EMULATEX (0x0f900010, 0x01100000, PROBES_DATA_PROCESSING_REG, |
c18377c3 DL |
319 | REGS(ANY, 0, 0, 0, ANY)), |
320 | ||
321 | /* MOV (register) cccc 0001 101x xxxx xxxx xxxx xxx0 xxxx */ | |
322 | /* MVN (register) cccc 0001 111x xxxx xxxx xxxx xxx0 xxxx */ | |
3e6cd394 | 323 | DECODE_EMULATEX (0x0fa00010, 0x01a00000, PROBES_DATA_PROCESSING_REG, |
c18377c3 DL |
324 | REGS(0, ANY, 0, 0, ANY)), |
325 | ||
326 | /* AND (register) cccc 0000 000x xxxx xxxx xxxx xxx0 xxxx */ | |
327 | /* EOR (register) cccc 0000 001x xxxx xxxx xxxx xxx0 xxxx */ | |
328 | /* SUB (register) cccc 0000 010x xxxx xxxx xxxx xxx0 xxxx */ | |
329 | /* RSB (register) cccc 0000 011x xxxx xxxx xxxx xxx0 xxxx */ | |
330 | /* ADD (register) cccc 0000 100x xxxx xxxx xxxx xxx0 xxxx */ | |
331 | /* ADC (register) cccc 0000 101x xxxx xxxx xxxx xxx0 xxxx */ | |
332 | /* SBC (register) cccc 0000 110x xxxx xxxx xxxx xxx0 xxxx */ | |
333 | /* RSC (register) cccc 0000 111x xxxx xxxx xxxx xxx0 xxxx */ | |
334 | /* ORR (register) cccc 0001 100x xxxx xxxx xxxx xxx0 xxxx */ | |
335 | /* BIC (register) cccc 0001 110x xxxx xxxx xxxx xxx0 xxxx */ | |
3e6cd394 | 336 | DECODE_EMULATEX (0x0e000010, 0x00000000, PROBES_DATA_PROCESSING_REG, |
c18377c3 DL |
337 | REGS(ANY, ANY, 0, 0, ANY)), |
338 | ||
339 | /* TST (reg-shift reg) cccc 0001 0001 xxxx xxxx xxxx 0xx1 xxxx */ | |
340 | /* TEQ (reg-shift reg) cccc 0001 0011 xxxx xxxx xxxx 0xx1 xxxx */ | |
341 | /* CMP (reg-shift reg) cccc 0001 0101 xxxx xxxx xxxx 0xx1 xxxx */ | |
342 | /* CMN (reg-shift reg) cccc 0001 0111 xxxx xxxx xxxx 0xx1 xxxx */ | |
3e6cd394 | 343 | DECODE_EMULATEX (0x0f900090, 0x01100010, PROBES_DATA_PROCESSING_REG, |
c18377c3 DL |
344 | REGS(ANY, 0, NOPC, 0, ANY)), |
345 | ||
346 | /* MOV (reg-shift reg) cccc 0001 101x xxxx xxxx xxxx 0xx1 xxxx */ | |
347 | /* MVN (reg-shift reg) cccc 0001 111x xxxx xxxx xxxx 0xx1 xxxx */ | |
3e6cd394 | 348 | DECODE_EMULATEX (0x0fa00090, 0x01a00010, PROBES_DATA_PROCESSING_REG, |
c18377c3 DL |
349 | REGS(0, ANY, NOPC, 0, ANY)), |
350 | ||
351 | /* AND (reg-shift reg) cccc 0000 000x xxxx xxxx xxxx 0xx1 xxxx */ | |
352 | /* EOR (reg-shift reg) cccc 0000 001x xxxx xxxx xxxx 0xx1 xxxx */ | |
353 | /* SUB (reg-shift reg) cccc 0000 010x xxxx xxxx xxxx 0xx1 xxxx */ | |
354 | /* RSB (reg-shift reg) cccc 0000 011x xxxx xxxx xxxx 0xx1 xxxx */ | |
355 | /* ADD (reg-shift reg) cccc 0000 100x xxxx xxxx xxxx 0xx1 xxxx */ | |
356 | /* ADC (reg-shift reg) cccc 0000 101x xxxx xxxx xxxx 0xx1 xxxx */ | |
357 | /* SBC (reg-shift reg) cccc 0000 110x xxxx xxxx xxxx 0xx1 xxxx */ | |
358 | /* RSC (reg-shift reg) cccc 0000 111x xxxx xxxx xxxx 0xx1 xxxx */ | |
359 | /* ORR (reg-shift reg) cccc 0001 100x xxxx xxxx xxxx 0xx1 xxxx */ | |
360 | /* BIC (reg-shift reg) cccc 0001 110x xxxx xxxx xxxx 0xx1 xxxx */ | |
3e6cd394 | 361 | DECODE_EMULATEX (0x0e000090, 0x00000010, PROBES_DATA_PROCESSING_REG, |
c18377c3 DL |
362 | REGS(ANY, ANY, NOPC, 0, ANY)), |
363 | ||
364 | DECODE_END | |
365 | }; | |
366 | ||
367 | static const union decode_item arm_cccc_001x_table[] = { | |
368 | /* Data-processing (immediate) */ | |
369 | ||
370 | /* MOVW cccc 0011 0000 xxxx xxxx xxxx xxxx xxxx */ | |
371 | /* MOVT cccc 0011 0100 xxxx xxxx xxxx xxxx xxxx */ | |
3e6cd394 | 372 | DECODE_EMULATEX (0x0fb00000, 0x03000000, PROBES_DATA_PROCESSING_IMM, |
c18377c3 DL |
373 | REGS(0, NOPC, 0, 0, 0)), |
374 | ||
375 | /* YIELD cccc 0011 0010 0000 xxxx xxxx 0000 0001 */ | |
376 | DECODE_OR (0x0fff00ff, 0x03200001), | |
377 | /* SEV cccc 0011 0010 0000 xxxx xxxx 0000 0100 */ | |
3e6cd394 | 378 | DECODE_EMULATE (0x0fff00ff, 0x03200004, PROBES_EMULATE_NONE), |
c18377c3 DL |
379 | /* NOP cccc 0011 0010 0000 xxxx xxxx 0000 0000 */ |
380 | /* WFE cccc 0011 0010 0000 xxxx xxxx 0000 0010 */ | |
381 | /* WFI cccc 0011 0010 0000 xxxx xxxx 0000 0011 */ | |
3e6cd394 | 382 | DECODE_SIMULATE (0x0fff00fc, 0x03200000, PROBES_SIMULATE_NOP), |
c18377c3 DL |
383 | /* DBG cccc 0011 0010 0000 xxxx xxxx ffff xxxx */ |
384 | /* unallocated hints cccc 0011 0010 0000 xxxx xxxx xxxx xxxx */ | |
385 | /* MSR (immediate) cccc 0011 0x10 xxxx xxxx xxxx xxxx xxxx */ | |
386 | DECODE_REJECT (0x0fb00000, 0x03200000), | |
387 | ||
388 | /* <op>S PC, ... cccc 001x xxx1 xxxx 1111 xxxx xxxx xxxx */ | |
389 | DECODE_REJECT (0x0e10f000, 0x0210f000), | |
390 | ||
391 | /* TST (immediate) cccc 0011 0001 xxxx xxxx xxxx xxxx xxxx */ | |
392 | /* TEQ (immediate) cccc 0011 0011 xxxx xxxx xxxx xxxx xxxx */ | |
393 | /* CMP (immediate) cccc 0011 0101 xxxx xxxx xxxx xxxx xxxx */ | |
394 | /* CMN (immediate) cccc 0011 0111 xxxx xxxx xxxx xxxx xxxx */ | |
3e6cd394 | 395 | DECODE_EMULATEX (0x0f900000, 0x03100000, PROBES_DATA_PROCESSING_IMM, |
c18377c3 DL |
396 | REGS(ANY, 0, 0, 0, 0)), |
397 | ||
398 | /* MOV (immediate) cccc 0011 101x xxxx xxxx xxxx xxxx xxxx */ | |
399 | /* MVN (immediate) cccc 0011 111x xxxx xxxx xxxx xxxx xxxx */ | |
3e6cd394 | 400 | DECODE_EMULATEX (0x0fa00000, 0x03a00000, PROBES_DATA_PROCESSING_IMM, |
c18377c3 DL |
401 | REGS(0, ANY, 0, 0, 0)), |
402 | ||
403 | /* AND (immediate) cccc 0010 000x xxxx xxxx xxxx xxxx xxxx */ | |
404 | /* EOR (immediate) cccc 0010 001x xxxx xxxx xxxx xxxx xxxx */ | |
405 | /* SUB (immediate) cccc 0010 010x xxxx xxxx xxxx xxxx xxxx */ | |
406 | /* RSB (immediate) cccc 0010 011x xxxx xxxx xxxx xxxx xxxx */ | |
407 | /* ADD (immediate) cccc 0010 100x xxxx xxxx xxxx xxxx xxxx */ | |
408 | /* ADC (immediate) cccc 0010 101x xxxx xxxx xxxx xxxx xxxx */ | |
409 | /* SBC (immediate) cccc 0010 110x xxxx xxxx xxxx xxxx xxxx */ | |
410 | /* RSC (immediate) cccc 0010 111x xxxx xxxx xxxx xxxx xxxx */ | |
411 | /* ORR (immediate) cccc 0011 100x xxxx xxxx xxxx xxxx xxxx */ | |
412 | /* BIC (immediate) cccc 0011 110x xxxx xxxx xxxx xxxx xxxx */ | |
3e6cd394 | 413 | DECODE_EMULATEX (0x0e000000, 0x02000000, PROBES_DATA_PROCESSING_IMM, |
c18377c3 DL |
414 | REGS(ANY, ANY, 0, 0, 0)), |
415 | ||
416 | DECODE_END | |
417 | }; | |
418 | ||
419 | static const union decode_item arm_cccc_0110_____xxx1_table[] = { | |
420 | /* Media instructions */ | |
421 | ||
422 | /* SEL cccc 0110 1000 xxxx xxxx xxxx 1011 xxxx */ | |
3e6cd394 | 423 | DECODE_EMULATEX (0x0ff000f0, 0x068000b0, PROBES_SATURATE, |
c18377c3 DL |
424 | REGS(NOPC, NOPC, 0, 0, NOPC)), |
425 | ||
426 | /* SSAT cccc 0110 101x xxxx xxxx xxxx xx01 xxxx */ | |
427 | /* USAT cccc 0110 111x xxxx xxxx xxxx xx01 xxxx */ | |
428 | DECODE_OR(0x0fa00030, 0x06a00010), | |
429 | /* SSAT16 cccc 0110 1010 xxxx xxxx xxxx 0011 xxxx */ | |
430 | /* USAT16 cccc 0110 1110 xxxx xxxx xxxx 0011 xxxx */ | |
3e6cd394 | 431 | DECODE_EMULATEX (0x0fb000f0, 0x06a00030, PROBES_SATURATE, |
c18377c3 DL |
432 | REGS(0, NOPC, 0, 0, NOPC)), |
433 | ||
434 | /* REV cccc 0110 1011 xxxx xxxx xxxx 0011 xxxx */ | |
435 | /* REV16 cccc 0110 1011 xxxx xxxx xxxx 1011 xxxx */ | |
436 | /* RBIT cccc 0110 1111 xxxx xxxx xxxx 0011 xxxx */ | |
437 | /* REVSH cccc 0110 1111 xxxx xxxx xxxx 1011 xxxx */ | |
3e6cd394 | 438 | DECODE_EMULATEX (0x0fb00070, 0x06b00030, PROBES_REV, |
c18377c3 DL |
439 | REGS(0, NOPC, 0, 0, NOPC)), |
440 | ||
441 | /* ??? cccc 0110 0x00 xxxx xxxx xxxx xxx1 xxxx */ | |
442 | DECODE_REJECT (0x0fb00010, 0x06000010), | |
443 | /* ??? cccc 0110 0xxx xxxx xxxx xxxx 1011 xxxx */ | |
444 | DECODE_REJECT (0x0f8000f0, 0x060000b0), | |
445 | /* ??? cccc 0110 0xxx xxxx xxxx xxxx 1101 xxxx */ | |
446 | DECODE_REJECT (0x0f8000f0, 0x060000d0), | |
447 | /* SADD16 cccc 0110 0001 xxxx xxxx xxxx 0001 xxxx */ | |
448 | /* SADDSUBX cccc 0110 0001 xxxx xxxx xxxx 0011 xxxx */ | |
449 | /* SSUBADDX cccc 0110 0001 xxxx xxxx xxxx 0101 xxxx */ | |
450 | /* SSUB16 cccc 0110 0001 xxxx xxxx xxxx 0111 xxxx */ | |
451 | /* SADD8 cccc 0110 0001 xxxx xxxx xxxx 1001 xxxx */ | |
452 | /* SSUB8 cccc 0110 0001 xxxx xxxx xxxx 1111 xxxx */ | |
453 | /* QADD16 cccc 0110 0010 xxxx xxxx xxxx 0001 xxxx */ | |
454 | /* QADDSUBX cccc 0110 0010 xxxx xxxx xxxx 0011 xxxx */ | |
455 | /* QSUBADDX cccc 0110 0010 xxxx xxxx xxxx 0101 xxxx */ | |
456 | /* QSUB16 cccc 0110 0010 xxxx xxxx xxxx 0111 xxxx */ | |
457 | /* QADD8 cccc 0110 0010 xxxx xxxx xxxx 1001 xxxx */ | |
458 | /* QSUB8 cccc 0110 0010 xxxx xxxx xxxx 1111 xxxx */ | |
459 | /* SHADD16 cccc 0110 0011 xxxx xxxx xxxx 0001 xxxx */ | |
460 | /* SHADDSUBX cccc 0110 0011 xxxx xxxx xxxx 0011 xxxx */ | |
461 | /* SHSUBADDX cccc 0110 0011 xxxx xxxx xxxx 0101 xxxx */ | |
462 | /* SHSUB16 cccc 0110 0011 xxxx xxxx xxxx 0111 xxxx */ | |
463 | /* SHADD8 cccc 0110 0011 xxxx xxxx xxxx 1001 xxxx */ | |
464 | /* SHSUB8 cccc 0110 0011 xxxx xxxx xxxx 1111 xxxx */ | |
465 | /* UADD16 cccc 0110 0101 xxxx xxxx xxxx 0001 xxxx */ | |
466 | /* UADDSUBX cccc 0110 0101 xxxx xxxx xxxx 0011 xxxx */ | |
467 | /* USUBADDX cccc 0110 0101 xxxx xxxx xxxx 0101 xxxx */ | |
468 | /* USUB16 cccc 0110 0101 xxxx xxxx xxxx 0111 xxxx */ | |
469 | /* UADD8 cccc 0110 0101 xxxx xxxx xxxx 1001 xxxx */ | |
470 | /* USUB8 cccc 0110 0101 xxxx xxxx xxxx 1111 xxxx */ | |
471 | /* UQADD16 cccc 0110 0110 xxxx xxxx xxxx 0001 xxxx */ | |
472 | /* UQADDSUBX cccc 0110 0110 xxxx xxxx xxxx 0011 xxxx */ | |
473 | /* UQSUBADDX cccc 0110 0110 xxxx xxxx xxxx 0101 xxxx */ | |
474 | /* UQSUB16 cccc 0110 0110 xxxx xxxx xxxx 0111 xxxx */ | |
475 | /* UQADD8 cccc 0110 0110 xxxx xxxx xxxx 1001 xxxx */ | |
476 | /* UQSUB8 cccc 0110 0110 xxxx xxxx xxxx 1111 xxxx */ | |
477 | /* UHADD16 cccc 0110 0111 xxxx xxxx xxxx 0001 xxxx */ | |
478 | /* UHADDSUBX cccc 0110 0111 xxxx xxxx xxxx 0011 xxxx */ | |
479 | /* UHSUBADDX cccc 0110 0111 xxxx xxxx xxxx 0101 xxxx */ | |
480 | /* UHSUB16 cccc 0110 0111 xxxx xxxx xxxx 0111 xxxx */ | |
481 | /* UHADD8 cccc 0110 0111 xxxx xxxx xxxx 1001 xxxx */ | |
482 | /* UHSUB8 cccc 0110 0111 xxxx xxxx xxxx 1111 xxxx */ | |
3e6cd394 | 483 | DECODE_EMULATEX (0x0f800010, 0x06000010, PROBES_MMI, |
c18377c3 DL |
484 | REGS(NOPC, NOPC, 0, 0, NOPC)), |
485 | ||
486 | /* PKHBT cccc 0110 1000 xxxx xxxx xxxx x001 xxxx */ | |
487 | /* PKHTB cccc 0110 1000 xxxx xxxx xxxx x101 xxxx */ | |
3e6cd394 | 488 | DECODE_EMULATEX (0x0ff00030, 0x06800010, PROBES_PACK, |
c18377c3 DL |
489 | REGS(NOPC, NOPC, 0, 0, NOPC)), |
490 | ||
491 | /* ??? cccc 0110 1001 xxxx xxxx xxxx 0111 xxxx */ | |
492 | /* ??? cccc 0110 1101 xxxx xxxx xxxx 0111 xxxx */ | |
493 | DECODE_REJECT (0x0fb000f0, 0x06900070), | |
494 | ||
495 | /* SXTB16 cccc 0110 1000 1111 xxxx xxxx 0111 xxxx */ | |
496 | /* SXTB cccc 0110 1010 1111 xxxx xxxx 0111 xxxx */ | |
497 | /* SXTH cccc 0110 1011 1111 xxxx xxxx 0111 xxxx */ | |
498 | /* UXTB16 cccc 0110 1100 1111 xxxx xxxx 0111 xxxx */ | |
499 | /* UXTB cccc 0110 1110 1111 xxxx xxxx 0111 xxxx */ | |
500 | /* UXTH cccc 0110 1111 1111 xxxx xxxx 0111 xxxx */ | |
3e6cd394 | 501 | DECODE_EMULATEX (0x0f8f00f0, 0x068f0070, PROBES_EXTEND, |
c18377c3 DL |
502 | REGS(0, NOPC, 0, 0, NOPC)), |
503 | ||
504 | /* SXTAB16 cccc 0110 1000 xxxx xxxx xxxx 0111 xxxx */ | |
505 | /* SXTAB cccc 0110 1010 xxxx xxxx xxxx 0111 xxxx */ | |
506 | /* SXTAH cccc 0110 1011 xxxx xxxx xxxx 0111 xxxx */ | |
507 | /* UXTAB16 cccc 0110 1100 xxxx xxxx xxxx 0111 xxxx */ | |
508 | /* UXTAB cccc 0110 1110 xxxx xxxx xxxx 0111 xxxx */ | |
509 | /* UXTAH cccc 0110 1111 xxxx xxxx xxxx 0111 xxxx */ | |
3e6cd394 | 510 | DECODE_EMULATEX (0x0f8000f0, 0x06800070, PROBES_EXTEND_ADD, |
c18377c3 DL |
511 | REGS(NOPCX, NOPC, 0, 0, NOPC)), |
512 | ||
513 | DECODE_END | |
514 | }; | |
515 | ||
516 | static const union decode_item arm_cccc_0111_____xxx1_table[] = { | |
517 | /* Media instructions */ | |
518 | ||
519 | /* UNDEFINED cccc 0111 1111 xxxx xxxx xxxx 1111 xxxx */ | |
520 | DECODE_REJECT (0x0ff000f0, 0x07f000f0), | |
521 | ||
522 | /* SMLALD cccc 0111 0100 xxxx xxxx xxxx 00x1 xxxx */ | |
523 | /* SMLSLD cccc 0111 0100 xxxx xxxx xxxx 01x1 xxxx */ | |
3e6cd394 | 524 | DECODE_EMULATEX (0x0ff00090, 0x07400010, PROBES_MUL_ADD_LONG, |
c18377c3 DL |
525 | REGS(NOPC, NOPC, NOPC, 0, NOPC)), |
526 | ||
527 | /* SMUAD cccc 0111 0000 xxxx 1111 xxxx 00x1 xxxx */ | |
528 | /* SMUSD cccc 0111 0000 xxxx 1111 xxxx 01x1 xxxx */ | |
529 | DECODE_OR (0x0ff0f090, 0x0700f010), | |
530 | /* SMMUL cccc 0111 0101 xxxx 1111 xxxx 00x1 xxxx */ | |
531 | DECODE_OR (0x0ff0f0d0, 0x0750f010), | |
532 | /* USAD8 cccc 0111 1000 xxxx 1111 xxxx 0001 xxxx */ | |
3e6cd394 | 533 | DECODE_EMULATEX (0x0ff0f0f0, 0x0780f010, PROBES_MUL_ADD, |
c18377c3 DL |
534 | REGS(NOPC, 0, NOPC, 0, NOPC)), |
535 | ||
536 | /* SMLAD cccc 0111 0000 xxxx xxxx xxxx 00x1 xxxx */ | |
537 | /* SMLSD cccc 0111 0000 xxxx xxxx xxxx 01x1 xxxx */ | |
538 | DECODE_OR (0x0ff00090, 0x07000010), | |
539 | /* SMMLA cccc 0111 0101 xxxx xxxx xxxx 00x1 xxxx */ | |
540 | DECODE_OR (0x0ff000d0, 0x07500010), | |
541 | /* USADA8 cccc 0111 1000 xxxx xxxx xxxx 0001 xxxx */ | |
3e6cd394 | 542 | DECODE_EMULATEX (0x0ff000f0, 0x07800010, PROBES_MUL_ADD, |
c18377c3 DL |
543 | REGS(NOPC, NOPCX, NOPC, 0, NOPC)), |
544 | ||
545 | /* SMMLS cccc 0111 0101 xxxx xxxx xxxx 11x1 xxxx */ | |
3e6cd394 | 546 | DECODE_EMULATEX (0x0ff000d0, 0x075000d0, PROBES_MUL_ADD, |
c18377c3 DL |
547 | REGS(NOPC, NOPC, NOPC, 0, NOPC)), |
548 | ||
549 | /* SBFX cccc 0111 101x xxxx xxxx xxxx x101 xxxx */ | |
550 | /* UBFX cccc 0111 111x xxxx xxxx xxxx x101 xxxx */ | |
3e6cd394 | 551 | DECODE_EMULATEX (0x0fa00070, 0x07a00050, PROBES_BITFIELD, |
c18377c3 DL |
552 | REGS(0, NOPC, 0, 0, NOPC)), |
553 | ||
554 | /* BFC cccc 0111 110x xxxx xxxx xxxx x001 1111 */ | |
3e6cd394 | 555 | DECODE_EMULATEX (0x0fe0007f, 0x07c0001f, PROBES_BITFIELD, |
c18377c3 DL |
556 | REGS(0, NOPC, 0, 0, 0)), |
557 | ||
558 | /* BFI cccc 0111 110x xxxx xxxx xxxx x001 xxxx */ | |
3e6cd394 | 559 | DECODE_EMULATEX (0x0fe00070, 0x07c00010, PROBES_BITFIELD, |
c18377c3 DL |
560 | REGS(0, NOPC, 0, 0, NOPCX)), |
561 | ||
562 | DECODE_END | |
563 | }; | |
564 | ||
565 | static const union decode_item arm_cccc_01xx_table[] = { | |
566 | /* Load/store word and unsigned byte */ | |
567 | ||
568 | /* LDRB/STRB pc,[...] cccc 01xx x0xx xxxx xxxx xxxx xxxx xxxx */ | |
569 | DECODE_REJECT (0x0c40f000, 0x0440f000), | |
570 | ||
571 | /* STRT cccc 01x0 x010 xxxx xxxx xxxx xxxx xxxx */ | |
572 | /* LDRT cccc 01x0 x011 xxxx xxxx xxxx xxxx xxxx */ | |
573 | /* STRBT cccc 01x0 x110 xxxx xxxx xxxx xxxx xxxx */ | |
574 | /* LDRBT cccc 01x0 x111 xxxx xxxx xxxx xxxx xxxx */ | |
575 | DECODE_REJECT (0x0d200000, 0x04200000), | |
576 | ||
577 | /* STR (immediate) cccc 010x x0x0 xxxx xxxx xxxx xxxx xxxx */ | |
578 | /* STRB (immediate) cccc 010x x1x0 xxxx xxxx xxxx xxxx xxxx */ | |
3e6cd394 | 579 | DECODE_EMULATEX (0x0e100000, 0x04000000, PROBES_STORE, |
c18377c3 DL |
580 | REGS(NOPCWB, ANY, 0, 0, 0)), |
581 | ||
582 | /* LDR (immediate) cccc 010x x0x1 xxxx xxxx xxxx xxxx xxxx */ | |
583 | /* LDRB (immediate) cccc 010x x1x1 xxxx xxxx xxxx xxxx xxxx */ | |
3e6cd394 | 584 | DECODE_EMULATEX (0x0e100000, 0x04100000, PROBES_LOAD, |
c18377c3 DL |
585 | REGS(NOPCWB, ANY, 0, 0, 0)), |
586 | ||
587 | /* STR (register) cccc 011x x0x0 xxxx xxxx xxxx xxxx xxxx */ | |
588 | /* STRB (register) cccc 011x x1x0 xxxx xxxx xxxx xxxx xxxx */ | |
3e6cd394 | 589 | DECODE_EMULATEX (0x0e100000, 0x06000000, PROBES_STORE, |
c18377c3 DL |
590 | REGS(NOPCWB, ANY, 0, 0, NOPC)), |
591 | ||
592 | /* LDR (register) cccc 011x x0x1 xxxx xxxx xxxx xxxx xxxx */ | |
593 | /* LDRB (register) cccc 011x x1x1 xxxx xxxx xxxx xxxx xxxx */ | |
3e6cd394 | 594 | DECODE_EMULATEX (0x0e100000, 0x06100000, PROBES_LOAD, |
c18377c3 DL |
595 | REGS(NOPCWB, ANY, 0, 0, NOPC)), |
596 | ||
597 | DECODE_END | |
598 | }; | |
599 | ||
600 | static const union decode_item arm_cccc_100x_table[] = { | |
601 | /* Block data transfer instructions */ | |
602 | ||
603 | /* LDM cccc 100x x0x1 xxxx xxxx xxxx xxxx xxxx */ | |
604 | /* STM cccc 100x x0x0 xxxx xxxx xxxx xxxx xxxx */ | |
3e6cd394 | 605 | DECODE_CUSTOM (0x0e400000, 0x08000000, PROBES_LDMSTM), |
c18377c3 DL |
606 | |
607 | /* STM (user registers) cccc 100x x1x0 xxxx xxxx xxxx xxxx xxxx */ | |
608 | /* LDM (user registers) cccc 100x x1x1 xxxx 0xxx xxxx xxxx xxxx */ | |
609 | /* LDM (exception ret) cccc 100x x1x1 xxxx 1xxx xxxx xxxx xxxx */ | |
610 | DECODE_END | |
611 | }; | |
612 | ||
613 | const union decode_item kprobe_decode_arm_table[] = { | |
614 | /* | |
615 | * Unconditional instructions | |
616 | * 1111 xxxx xxxx xxxx xxxx xxxx xxxx xxxx | |
617 | */ | |
618 | DECODE_TABLE (0xf0000000, 0xf0000000, arm_1111_table), | |
619 | ||
620 | /* | |
621 | * Miscellaneous instructions | |
622 | * cccc 0001 0xx0 xxxx xxxx xxxx 0xxx xxxx | |
623 | */ | |
624 | DECODE_TABLE (0x0f900080, 0x01000000, arm_cccc_0001_0xx0____0xxx_table), | |
625 | ||
626 | /* | |
627 | * Halfword multiply and multiply-accumulate | |
628 | * cccc 0001 0xx0 xxxx xxxx xxxx 1xx0 xxxx | |
629 | */ | |
630 | DECODE_TABLE (0x0f900090, 0x01000080, arm_cccc_0001_0xx0____1xx0_table), | |
631 | ||
632 | /* | |
633 | * Multiply and multiply-accumulate | |
634 | * cccc 0000 xxxx xxxx xxxx xxxx 1001 xxxx | |
635 | */ | |
636 | DECODE_TABLE (0x0f0000f0, 0x00000090, arm_cccc_0000_____1001_table), | |
637 | ||
638 | /* | |
639 | * Synchronization primitives | |
640 | * cccc 0001 xxxx xxxx xxxx xxxx 1001 xxxx | |
641 | */ | |
642 | DECODE_TABLE (0x0f0000f0, 0x01000090, arm_cccc_0001_____1001_table), | |
643 | ||
644 | /* | |
645 | * Extra load/store instructions | |
646 | * cccc 000x xxxx xxxx xxxx xxxx 1xx1 xxxx | |
647 | */ | |
648 | DECODE_TABLE (0x0e000090, 0x00000090, arm_cccc_000x_____1xx1_table), | |
649 | ||
650 | /* | |
651 | * Data-processing (register) | |
652 | * cccc 000x xxxx xxxx xxxx xxxx xxx0 xxxx | |
653 | * Data-processing (register-shifted register) | |
654 | * cccc 000x xxxx xxxx xxxx xxxx 0xx1 xxxx | |
655 | */ | |
656 | DECODE_TABLE (0x0e000000, 0x00000000, arm_cccc_000x_table), | |
657 | ||
658 | /* | |
659 | * Data-processing (immediate) | |
660 | * cccc 001x xxxx xxxx xxxx xxxx xxxx xxxx | |
661 | */ | |
662 | DECODE_TABLE (0x0e000000, 0x02000000, arm_cccc_001x_table), | |
663 | ||
664 | /* | |
665 | * Media instructions | |
666 | * cccc 011x xxxx xxxx xxxx xxxx xxx1 xxxx | |
667 | */ | |
668 | DECODE_TABLE (0x0f000010, 0x06000010, arm_cccc_0110_____xxx1_table), | |
669 | DECODE_TABLE (0x0f000010, 0x07000010, arm_cccc_0111_____xxx1_table), | |
670 | ||
671 | /* | |
672 | * Load/store word and unsigned byte | |
673 | * cccc 01xx xxxx xxxx xxxx xxxx xxxx xxxx | |
674 | */ | |
675 | DECODE_TABLE (0x0c000000, 0x04000000, arm_cccc_01xx_table), | |
676 | ||
677 | /* | |
678 | * Block data transfer instructions | |
679 | * cccc 100x xxxx xxxx xxxx xxxx xxxx xxxx | |
680 | */ | |
681 | DECODE_TABLE (0x0e000000, 0x08000000, arm_cccc_100x_table), | |
682 | ||
683 | /* B cccc 1010 xxxx xxxx xxxx xxxx xxxx xxxx */ | |
684 | /* BL cccc 1011 xxxx xxxx xxxx xxxx xxxx xxxx */ | |
3e6cd394 | 685 | DECODE_SIMULATE (0x0e000000, 0x0a000000, PROBES_BRANCH), |
c18377c3 DL |
686 | |
687 | /* | |
688 | * Supervisor Call, and coprocessor instructions | |
689 | */ | |
690 | ||
691 | /* MCRR cccc 1100 0100 xxxx xxxx xxxx xxxx xxxx */ | |
692 | /* MRRC cccc 1100 0101 xxxx xxxx xxxx xxxx xxxx */ | |
693 | /* LDC cccc 110x xxx1 xxxx xxxx xxxx xxxx xxxx */ | |
694 | /* STC cccc 110x xxx0 xxxx xxxx xxxx xxxx xxxx */ | |
695 | /* CDP cccc 1110 xxxx xxxx xxxx xxxx xxx0 xxxx */ | |
696 | /* MCR cccc 1110 xxx0 xxxx xxxx xxxx xxx1 xxxx */ | |
697 | /* MRC cccc 1110 xxx1 xxxx xxxx xxxx xxx1 xxxx */ | |
698 | /* SVC cccc 1111 xxxx xxxx xxxx xxxx xxxx xxxx */ | |
699 | DECODE_REJECT (0x0c000000, 0x0c000000), | |
700 | ||
701 | DECODE_END | |
702 | }; | |
703 | #ifdef CONFIG_ARM_KPROBES_TEST_MODULE | |
704 | EXPORT_SYMBOL_GPL(kprobe_decode_arm_table); | |
705 | #endif | |
706 | ||
f145d664 | 707 | static void __kprobes arm_singlestep(probes_opcode_t insn, |
7579f4b3 | 708 | struct arch_specific_insn *asi, struct pt_regs *regs) |
c18377c3 DL |
709 | { |
710 | regs->ARM_pc += 4; | |
7579f4b3 | 711 | asi->insn_handler(insn, asi, regs); |
c18377c3 DL |
712 | } |
713 | ||
714 | /* Return: | |
715 | * INSN_REJECTED If instruction is one not allowed to kprobe, | |
716 | * INSN_GOOD If instruction is supported and uses instruction slot, | |
717 | * INSN_GOOD_NO_SLOT If instruction is supported but doesn't use its slot. | |
718 | * | |
719 | * For instructions we don't want to kprobe (INSN_REJECTED return result): | |
720 | * These are generally ones that modify the processor state making | |
721 | * them "hard" to simulate such as switches processor modes or | |
722 | * make accesses in alternate modes. Any of these could be simulated | |
723 | * if the work was put into it, but low return considering they | |
724 | * should also be very rare. | |
725 | */ | |
44a0a59c | 726 | enum probes_insn __kprobes |
f145d664 | 727 | arm_kprobe_decode_insn(probes_opcode_t insn, struct arch_specific_insn *asi, |
3e6cd394 | 728 | const union decode_action *actions) |
c18377c3 DL |
729 | { |
730 | asi->insn_singlestep = arm_singlestep; | |
f145d664 | 731 | asi->insn_check_cc = probes_condition_checks[insn>>28]; |
3e6cd394 DL |
732 | return kprobe_decode_insn(insn, asi, kprobe_decode_arm_table, false, |
733 | actions); | |
c18377c3 | 734 | } |