arch/arm/kernel/probes-arm.c

   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>
  22
  23 #include "probes.h"
  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
  60 void __kprobes simulate_bbl(probes_opcode_t insn,
  61                 struct arch_probes_insn *asi, struct pt_regs *regs)
  62 {
  63         long iaddr = (long) regs->ARM_pc - 4;
  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
  72 void __kprobes simulate_blx1(probes_opcode_t insn,
  73                 struct arch_probes_insn *asi, struct pt_regs *regs)
  74 {
  75         long iaddr = (long) regs->ARM_pc - 4;
  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
  83 void __kprobes simulate_blx2bx(probes_opcode_t insn,
  84                 struct arch_probes_insn *asi, struct pt_regs *regs)
  85 {
  86         int rm = insn & 0xf;
  87         long rmv = regs->uregs[rm];
  88
  89         if (insn & (1 << 5))
  90                 regs->ARM_lr = (long) regs->ARM_pc;
  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
  98 void __kprobes simulate_mrs(probes_opcode_t insn,
  99                 struct arch_probes_insn *asi, struct pt_regs *regs)
 100 {
 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
 106 void __kprobes simulate_mov_ipsp(probes_opcode_t insn,
 107                 struct arch_probes_insn *asi, struct pt_regs *regs)
 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 */
 129         DECODE_SIMULATE (0xfe300000, 0xf4100000, PROBES_PRELOAD_IMM),
 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 */
 135         DECODE_SIMULATE (0xfe300010, 0xf6100000, PROBES_PRELOAD_REG),
 136
 137         /* BLX (immediate)      1111 101x xxxx xxxx xxxx xxxx xxxx xxxx */
 138         DECODE_SIMULATE (0xfe000000, 0xfa000000, PROBES_BRANCH_IMM),
 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 */
 162         DECODE_SIMULATEX(0x0ff000f0, 0x01000000, PROBES_MRS,
 163                                                  REGS(0, NOPC, 0, 0, 0)),
 164
 165         /* BX                   cccc 0001 0010 xxxx xxxx xxxx 0001 xxxx */
 166         DECODE_SIMULATE (0x0ff000f0, 0x01200010, PROBES_BRANCH_REG),
 167
 168         /* BLX (register)       cccc 0001 0010 xxxx xxxx xxxx 0011 xxxx */
 169         DECODE_SIMULATEX(0x0ff000f0, 0x01200030, PROBES_BRANCH_REG,
 170                                                  REGS(0, 0, 0, 0, NOPC)),
 171
 172         /* CLZ                  cccc 0001 0110 xxxx xxxx xxxx 0001 xxxx */
 173         DECODE_EMULATEX (0x0ff000f0, 0x01600010, PROBES_CLZ,
 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 */
 180         DECODE_EMULATEX (0x0f9000f0, 0x01000050, PROBES_SATURATING_ARITHMETIC,
 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 */
 196         DECODE_EMULATEX (0x0ff00090, 0x01400080, PROBES_MUL1,
 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 */
 202         DECODE_EMULATEX (0x0ff00090, 0x01600080, PROBES_MUL2,
 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 */
 208         DECODE_EMULATEX (0x0ff000b0, 0x01200080, PROBES_MUL2,
 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 */
 219         DECODE_EMULATEX (0x0fe000f0, 0x00000090, PROBES_MUL2,
 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 */
 226         DECODE_EMULATEX (0x0ff000f0, 0x00600090, PROBES_MUL2,
 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 */
 239         DECODE_EMULATEX (0x0f8000f0, 0x00800090, PROBES_MUL1,
 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 */
 251         DECODE_EMULATEX (0x0fb000f0, 0x01000090, PROBES_SWP,
 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 */
 274         DECODE_EMULATEX (0x0e5000d0, 0x000000d0, PROBES_LDRSTRD,
 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 */
 279         DECODE_EMULATEX (0x0e5000d0, 0x004000d0, PROBES_LDRSTRD,
 280                                                  REGS(NOPCWB, NOPCX, 0, 0, 0)),
 281
 282         /* STRH (register)      cccc 000x x0x0 xxxx xxxx xxxx 1011 xxxx */
 283         DECODE_EMULATEX (0x0e5000f0, 0x000000b0, PROBES_STORE_EXTRA,
 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 */
 289         DECODE_EMULATEX (0x0e500090, 0x00100090, PROBES_LOAD_EXTRA,
 290                                                  REGS(NOPCWB, NOPC, 0, 0, NOPC)),
 291
 292         /* STRH (immediate)     cccc 000x x1x0 xxxx xxxx xxxx 1011 xxxx */
 293         DECODE_EMULATEX (0x0e5000f0, 0x004000b0, PROBES_STORE_EXTRA,
 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 */
 299         DECODE_EMULATEX (0x0e500090, 0x00500090, PROBES_LOAD_EXTRA,
 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 */
 312         DECODE_SIMULATE (0xffffffff, 0xe1a0c00d, PROBES_MOV_IP_SP),
 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 */
 318         DECODE_EMULATEX (0x0f900010, 0x01100000, PROBES_DATA_PROCESSING_REG,
 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 */
 323         DECODE_EMULATEX (0x0fa00010, 0x01a00000, PROBES_DATA_PROCESSING_REG,
 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 */
 336         DECODE_EMULATEX (0x0e000010, 0x00000000, PROBES_DATA_PROCESSING_REG,
 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 */
 343         DECODE_EMULATEX (0x0f900090, 0x01100010, PROBES_DATA_PROCESSING_REG,
 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 */
 348         DECODE_EMULATEX (0x0fa00090, 0x01a00010, PROBES_DATA_PROCESSING_REG,
 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 */
 361         DECODE_EMULATEX (0x0e000090, 0x00000010, PROBES_DATA_PROCESSING_REG,
 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 */
 372         DECODE_EMULATEX (0x0fb00000, 0x03000000, PROBES_DATA_PROCESSING_IMM,
 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 */
 378         DECODE_EMULATE  (0x0fff00ff, 0x03200004, PROBES_EMULATE_NONE),
 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 */
 382         DECODE_SIMULATE (0x0fff00fc, 0x03200000, PROBES_SIMULATE_NOP),
 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 */
 395         DECODE_EMULATEX (0x0f900000, 0x03100000, PROBES_DATA_PROCESSING_IMM,
 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 */
 400         DECODE_EMULATEX (0x0fa00000, 0x03a00000, PROBES_DATA_PROCESSING_IMM,
 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 */
 413         DECODE_EMULATEX (0x0e000000, 0x02000000, PROBES_DATA_PROCESSING_IMM,
 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 */
 423         DECODE_EMULATEX (0x0ff000f0, 0x068000b0, PROBES_SATURATE,
 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 */
 431         DECODE_EMULATEX (0x0fb000f0, 0x06a00030, PROBES_SATURATE,
 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 */
 438         DECODE_EMULATEX (0x0fb00070, 0x06b00030, PROBES_REV,
 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 */
 483         DECODE_EMULATEX (0x0f800010, 0x06000010, PROBES_MMI,
 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 */
 488         DECODE_EMULATEX (0x0ff00030, 0x06800010, PROBES_PACK,
 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 */
 501         DECODE_EMULATEX (0x0f8f00f0, 0x068f0070, PROBES_EXTEND,
 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 */
 510         DECODE_EMULATEX (0x0f8000f0, 0x06800070, PROBES_EXTEND_ADD,
 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 */
 524         DECODE_EMULATEX (0x0ff00090, 0x07400010, PROBES_MUL_ADD_LONG,
 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 */
 533         DECODE_EMULATEX (0x0ff0f0f0, 0x0780f010, PROBES_MUL_ADD,
 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 */
 542         DECODE_EMULATEX (0x0ff000f0, 0x07800010, PROBES_MUL_ADD,
 543                                                  REGS(NOPC, NOPCX, NOPC, 0, NOPC)),
 544
 545         /* SMMLS                cccc 0111 0101 xxxx xxxx xxxx 11x1 xxxx */
 546         DECODE_EMULATEX (0x0ff000d0, 0x075000d0, PROBES_MUL_ADD,
 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 */
 551         DECODE_EMULATEX (0x0fa00070, 0x07a00050, PROBES_BITFIELD,
 552                                                  REGS(0, NOPC, 0, 0, NOPC)),
 553
 554         /* BFC                  cccc 0111 110x xxxx xxxx xxxx x001 1111 */
 555         DECODE_EMULATEX (0x0fe0007f, 0x07c0001f, PROBES_BITFIELD,
 556                                                  REGS(0, NOPC, 0, 0, 0)),
 557
 558         /* BFI                  cccc 0111 110x xxxx xxxx xxxx x001 xxxx */
 559         DECODE_EMULATEX (0x0fe00070, 0x07c00010, PROBES_BITFIELD,
 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 */
 579         DECODE_EMULATEX (0x0e100000, 0x04000000, PROBES_STORE,
 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 */
 584         DECODE_EMULATEX (0x0e100000, 0x04100000, PROBES_LOAD,
 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 */
 589         DECODE_EMULATEX (0x0e100000, 0x06000000, PROBES_STORE,
 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 */
 594         DECODE_EMULATEX (0x0e100000, 0x06100000, PROBES_LOAD,
 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 */
 605         DECODE_CUSTOM   (0x0e400000, 0x08000000, PROBES_LDMSTM),
 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 probes_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 */
 685         DECODE_SIMULATE (0x0e000000, 0x0a000000, PROBES_BRANCH),
 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(probes_decode_arm_table);
 705 #endif
 706
 707 static void __kprobes arm_singlestep(probes_opcode_t insn,
 708                 struct arch_probes_insn *asi, struct pt_regs *regs)
 709 {
 710         regs->ARM_pc += 4;
 711         asi->insn_handler(insn, asi, regs);
 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  */
 726 enum probes_insn __kprobes
 727 arm_probes_decode_insn(probes_opcode_t insn, struct arch_probes_insn *asi,
 728                        bool emulate, const union decode_action *actions)
 729 {
 730         asi->insn_singlestep = arm_singlestep;
 731         asi->insn_check_cc = probes_condition_checks[insn>>28];
 732         return probes_decode_insn(insn, asi, probes_decode_arm_table, false,
 733                                   emulate, actions);
 734 }