root/platform/g7x/sub/100b/boot.c

DEFINITIONS

1. spytask
2. CreateTask_spytask
3. boot
4. CreateTask_my
5. sub_fc064300_my
6. sub_fc064490_my
7. sub_fc064896_my
8. task_Startup_my
9. sub_fc0780e6_my
10. init_file_modules_task
11. init_required_fw_features
12. kbd_p2_f_my
13. sub_fc075c6e_my

   1 #include "lolevel.h"
   2 #include "platform.h"
   3 #include "core.h"
   5 const char * const new_sa = &_end;
   7 // Forward declarations
   9 extern void task_CaptSeq();
  10 extern void task_InitFileModules();
  11 extern void task_RotaryEncoder();
  12 extern void task_MovieRecord();
  13 extern void task_ExpDrv();
  15 extern void handle_jogdial();
  17 /*----------------------------------------------------------------------
  18     spytask
  19 -----------------------------------------------------------------------*/
  20 void spytask(long ua, long ub, long uc, long ud, long ue, long uf)
  21 {
  22     (void)ua; (void)ub; (void)uc; (void)ud; (void)ue; (void)uf;
core_spytask();
  24 }
  26 /*----------------------------------------------------------------------
  27     CreateTask_spytask
  28 -----------------------------------------------------------------------*/
  29 void CreateTask_spytask()
  30 {
_CreateTask("SpyTask", 0x19, 0x2000, spytask, 0);
  32 }
  35 /*----------------------------------------------------------------------
  36     boot()
  37 
  38     Main entry point for the CHDK code
  39 -----------------------------------------------------------------------*/
  41 /*************************************************************/
  42 //  -s=0xfc02000d -c=35
  43 void __attribute__((naked,noinline)) boot() {
  44     asm volatile (
  45 "    movw    r0, #0x4000\n"
  46 "    movt    r0, #0\n"
  47 "    mov     sp, r0\n"
  48 "    bl      sub_fc02006a\n"
  49 "    ldr     r2, =0xc0242010\n"
  50 "    ldr     r1, [r2]\n"
  51 "    orr     r1, r1, #1\n"
  52 "    str     r1, [r2]\n"
  53 "    ldr     r0, =0xfcd67020\n"
  54 "    ldr     r1, =0x010e1000\n"
  55 "    ldr     r3, =0x0110dc1c\n"
  56 "loc_fc02002a:\n"
  57 "    cmp     r1, r3\n"
  58 "    itt     lo\n"
  59 "    ldrlo   r2, [r0], #4\n"
  60 "    strlo   r2, [r1], #4\n"
  61 "    blo     loc_fc02002a\n"
  62 // Install CreateTask patch
  63 // use half words in case source or destination not word aligned
  64         "adr     r0, patch_CreateTask\n"    // src: Patch data
  65         "ldr     r1, =hook_CreateTask\n"    // dest: Address to patch (hook_ has thumb bit off)
  66         "add     r2, r0, #8\n" // two words
  67 "task_hook_loop:\n"
  68         "ldrh   r3, [r0],#2\n"
  69         "strh   r3, [r1],#2\n"
  70         "cmp    r0,r2\n"
  71         "blo    task_hook_loop\n"
  72 "    ldr     r0, =0x010e1000\n"
  73 "    ldr     r1, =0x0002cc1c\n"
  74 "    bl      sub_fc133dae\n"
  75 "    ldr     r0, =0xfcd39d68\n"
  76 "    ldr     r1, =0x00008000\n"
  77 "    ldr     r3, =0x000352b8\n"
  78 "loc_fc020046:\n"
  79 "    cmp     r1, r3\n"
  80 "    itt     lo\n"
  81 "    ldrlo   r2, [r0], #4\n"
  82 "    strlo   r2, [r1], #4\n"
  83 "    blo     loc_fc020046\n"
  84 "    ldr     r3, =0x000352b8\n"
  85 "    ldr     r1, =0x0036a354\n"
  86 "    mov.w   r2, #0\n"
  87 "loc_fc02005c:\n"
  88 "    cmp     r3, r1\n"
  89 "    it      lo\n"
  90 "    strlo   r2, [r3], #4\n"
  91 "    blo     loc_fc02005c\n"
  92 "    b.w     sub_fc064300_my\n"
  94         "patch_CreateTask:\n"
  95         "ldr.w   pc, [pc,#0]\n"             // Do jump to absolute address CreateTask_my
  96         ".long   CreateTask_my + 1\n"           // has to be a thumb address
  97 );
  98 }
 100 /*************************************************************/
 101 void __attribute__((naked,noinline)) CreateTask_my() {
 102 asm volatile (
 103 "    push   {r0}\n"
 104 //R3 = Pointer to task function to create
 105 "    ldr     r0, =task_CaptSeq\n"       // DryOS original code function ptr.
 106 "    cmp     r0, r3\n"                  // is the given taskptr equal to our searched function?
 107 "    itt     eq\n"                      // EQ block
 108 "    ldreq   r3, =capt_seq_task\n"      // if so replace with our task function base ptr.
 109 "    orreq   r3, #1\n"                  // make sure it's a thumb address (may not be needed?)
 110 "    beq     exitHook\n"                // below compares not necessary if this check has found something.
 112 /*
 113 "    LDR     R0, =task_ExpDrv\n"
 114 "    CMP     R0, R3\n"
 115 "    itt     eq\n"
 116 "    LDREQ   R3, =exp_drv_task\n"
 117 "    orreq   r3, #1\n"
 118 "    BEQ     exitHook\n"
 119 
 120 "    LDR     R0, =task_DvlpSeqTask\n"
 121 "    CMP     R0, R3\n"
 122 "    itt     eq\n"
 123 "    LDREQ   R3, =developseq_task\n"
 124 "    orreq   r3, #1\n"
 125 "    BEQ     exitHook\n"
 126 */
 128 "    ldr     r0, =task_FileWrite\n"
 129 "    cmp     r0, r3\n"
 130 "    itt     eq\n"
 131 "    ldreq   r3, =filewritetask\n"
 132 "    orreq   r3, #1\n"
 133 "    beq     exitHook\n"
 135 /*
 136 "    LDR     R0, =task_MovieRecord\n"
 137 "    CMP     R0, R3\n"
 138 "    LDREQ   R3, =movie_record_task\n"
 139 "    BEQ     exitHook\n"
 140 */
 142 "    ldr     r0, =task_InitFileModules\n"
 143 "    cmp     r0, r3\n"
 144 "    itt     eq\n"
 145 "    ldreq   r3, =init_file_modules_task\n"
 146 "    orreq   r3, #1\n"
 147 "exitHook:\n" 
 148 // restore overwritten register(s)
 149 "    pop    {r0}\n"
 150 // Execute overwritten instructions from original code, then jump to firmware
 151 // NOTE number of instructions duplicated here depends on size of original ROM code
 152 // instructions. Must replace 8 bytes!
 153 "    stmdb   sp!, {r1, r2, r3, r4, r5, r6, r7, r8, r9, lr}\n"
 154 "    mov     r4, r0\n"
 155 "    ldr     r0, =0x8160\n"
 156 "    ldr.w   pc, =(hook_CreateTask + 8 + 1) \n"  // Continue in firmware (thumb bit set)
 157 ".ltorg\n"
 158 );
 159 }
 161 void __attribute__((naked,noinline)) sub_fc064300_my() {
 162 // no GPIO checks needed with 0x12345678 set, native fw handles long press
 163 // -s=0xfc064301 -c=60
 164     asm volatile (
 165 "    push    {r4, lr}\n"
 166 #if defined(CHDK_NOT_IN_CANON_HEAP)
 167 "    ldr     r4, =0x0036a354\n"         // heap start, modify here
 168 #else
 169     "ldr     r4, =new_sa\n"             // +
 170     "ldr     r4, [r4]\n"                // +
 171 #endif
 172 "    sub     sp, #0x78\n"
 173 "    ldr     r0, =0x006ce000\n"
 174 "    ldr     r1, =0x0008fd8c\n"
 175 "    subs    r0, r0, r4\n"
 176 "    cmp     r0, r1\n"
 177 "    bhs     loc_fc064312\n"
 178 "loc_fc064310:\n"
 179 "    b       loc_fc064310\n"
 180 "loc_fc064312:\n"
 181 "    ldr     r1, =0x00008074\n"
 182 "    mov.w   r0, #0x80000\n"
 183 "    str     r0, [r1]\n"
 184 "    ldr     r1, =0x00008078\n"
 185 "    ldr     r0, =0x42a41000\n"
 186 "    str     r0, [r1]\n"
 187 "    ldr     r1, =0x0000807c\n"
 188 "    ldr     r0, =0x42a43000\n"
 189 "    str     r0, [r1]\n"
 190 "    movs    r1, #0x78\n"
 191 "    mov     r0, sp\n"
 192 "    blx     sub_fc2efa30\n" // j_bzero
 193 "    ldr     r0, =0x0062e000\n"
 194 "    mov.w   r1, #0xa0000\n"
 195 "    stm.w   sp, {r0, r1, r4}\n"
 196 "    ldr     r1, =0x00622274\n"
 197 "    subs    r2, r1, r4\n"
 198 "    strd    r2, r1, [sp, #0xc]\n"
 199 "    str     r0, [sp, #0x14]\n"
 200 "    movs    r0, #0x22\n"
 201 "    str     r0, [sp, #0x18]\n"
 202 "    movs    r0, #0x98\n"
 203 "    str     r0, [sp, #0x1c]\n"
 204 "    movw    r0, #0x24c\n"
 205 "    str     r0, [sp, #0x20]\n"
 206 "    movs    r0, #0xfa\n"
 207 "    str     r0, [sp, #0x24]\n"
 208 "    movs    r0, #0xe8\n"
 209 "    str     r0, [sp, #0x28]\n"
 210 "    movs    r0, #0x85\n"
 211 "    str     r0, [sp, #0x2c]\n"
 212 "    movs    r0, #0x40\n"
 213 "    str     r0, [sp, #0x30]\n"
 214 "    movs    r0, #4\n"
 215 "    str     r0, [sp, #0x34]\n"
 216 "    movs    r0, #0\n"
 217 "    str     r0, [sp, #0x38]\n"
 218 "    movs    r0, #0x10\n"
 219 "    str     r0, [sp, #0x5c]\n"
 220 "    movs    r2, #0\n"
 221 "    lsls    r0, r0, #8\n"
 222 "    str     r0, [sp, #0x60]\n"
 223 //"    ldr     r1, =0xfc064491\n"
 224 "    ldr     r1, =sub_fc064490_my\n"// -> continue here (init_task)
 225 "    asrs    r0, r0, #4\n"
 226 "    str     r0, [sp, #0x64]\n"
 227 "    lsls    r0, r0, #5\n"
 228 "    str     r0, [sp, #0x68]\n"
 229 "    mov     r0, sp\n"
 230 "    blx     sub_fc2eef88\n"
 231 "    add     sp, #0x78\n"
 232 "    pop     {r4, pc}\n"
 233 ".ltorg\n"
 234     );
 235 }
 237 void __attribute__((naked,noinline)) sub_fc064490_my() {
 238 // -s=0xfc064491 -c=54
 239     asm volatile (
 240 "    push    {r4, lr}\n"
 241 "    ldr     r4, =0xfc06453c\n" //  *"/_term"
 242 "    bl      sub_fc065764\n"
 243 "    ldr     r0, =0x000080ec\n"
 244 "    ldr     r1, [r0]\n"
 245 "    ldr     r0, =0x00008074\n"
 246 "    ldr     r0, [r0]\n"
 247 "    adds    r0, #0x10\n"
 248 "    cmp     r1, r0\n"
 249 "    bhs     loc_fc0644ac\n"
 250 "    ldr     r0, =0xfc06454c\n" //  *"USER_MEM size checking"
 251 "    bl      sub_fc064524\n"
 252 "loc_fc0644ac:\n"
 253 "    bl      sub_fc133e88\n"
 254 "    ldr     r3, =0x80000800\n"
 255 // note capdis bad output
 256 //"    mov.w   r1, #-0x80000000\n"
 257 //"    mov.w   r2, #-0x11111112\n"
 258 "    mov.w   r1, #0x80000000\n"
 259 "    mov.w   r2, #0xeeeeeeee\n"
 260 "loc_fc0644ba:\n"
 261 "    stm     r1!, {r2}\n"
 262 "    cmp     r1, r3\n"
 263 "    blo     loc_fc0644ba\n"
 264 "    bl      sub_fc133e9a\n"
 265 "    bl      sub_fc133f18\n"
 266 "    cmp     r0, #0\n"
 267 "    bge     loc_fc0644d2\n"
 268 "    ldr     r0, =0xfc064568\n" //  *"dmSetup"
 269 "    bl      sub_fc064524\n"
 270 "loc_fc0644d2:\n"
 271 "    bl      sub_fc064d18\n"
 272 "    cmp     r0, #0\n"
 273 "    bge     loc_fc0644e0\n"
 274 "    ldr     r0, =0xfc064570\n" //  *"termDriverInit"
 275 "    bl      sub_fc064524\n"
 276 "loc_fc0644e0:\n"
 277 "    mov     r0, r4\n"
 278 "    bl      sub_fc064da6\n"
 279 "    cmp     r0, #0\n"
 280 "    bge     loc_fc0644f0\n"
 281 "    ldr     r0, =0xfc064580\n" //  *"termDeviceCreate"
 282 "    bl      sub_fc064524\n"
 283 "loc_fc0644f0:\n"
 284 "    mov     r0, r4\n"
 285 "    bl      sub_fc0646c8\n"
 286 "    cmp     r0, #0\n"
 287 "    bge     loc_fc064500\n"
 288 "    ldr     r0, =0xfc064594\n" //  *"stdioSetup"
 289 "    bl      sub_fc064524\n"
 290 "loc_fc064500:\n"
 291 "    bl      sub_fc06480c\n"
 292 "    cmp     r0, #0\n"
 293 "    bge     loc_fc06450e\n"
 294 "    ldr     r0, =0xfc0645a0\n" //  *"stdlibSetup"
 295 "    bl      sub_fc064524\n"
 296 "loc_fc06450e:\n"
 297 "    bl      sub_fc0678ec\n"
 298 "    cmp     r0, #0\n"
 299 "    bge     loc_fc06451c\n"
 300 "    ldr     r0, =0xfc0645ac\n" //  *"extlib_setup"
 301 "    bl      sub_fc064524\n"
 302 "loc_fc06451c:\n"
 303 "    pop.w   {r4, lr}\n"
 304 "    b.w     sub_fc064896_my\n" // ->
 305     ".ltorg\n"
 306     );
 307 }
 308 void __attribute__((naked,noinline)) sub_fc064896_my() {
 309     asm volatile (
 310 // -s=0xfc064897 -c=27
 311 "    push    {r3, lr}\n"
 312 "    bl      sub_fc0649b0\n"
 313 "    bl      sub_fc0bda32\n"
 314 "    cbnz    r0, loc_fc0648ac\n"
 315 "    bl      sub_fc079012\n" // IsNormalCameraMode_FW
 316 "    cbz     r0, loc_fc0648ac\n"
 317 "    movs    r0, #1\n"
 318 "    b       loc_fc0648ae\n"
 319 "loc_fc0648ac:\n"
 320 "    movs    r0, #0\n"
 321 "loc_fc0648ae:\n"
 322 "    bl      sub_fc0781f4\n" // power-on mode handling & startupchecks here, no override needed with 0x12345678 set
 323 "    cbnz    r0, loc_fc0648ba\n"
 324 "    bl      sub_fc06499e\n"
 325 "loc_fc0648b8:\n"
 326 "    b       loc_fc0648b8\n"
 327 "loc_fc0648ba:\n"
 328 "    blx     sub_fc2eefe0\n" 
 329 "    ldr     r1, =0x006ce000\n"
 330 "    movs    r0, #0\n"
 331 "    bl      sub_fc36025c\n"
 332 "    blx     sub_fc2ef548\n"
 333 "    movs    r3, #0\n"
 334 "    str     r3, [sp]\n"
 335 //"    ldr     r3, =0xfc064831\n" //  task_Startup
 336 "    ldr     r3, =task_Startup_my\n" //  ->
 337 "    movs    r2, #0\n"
 338 "    movs    r1, #0x19\n"
 339 "    ldr     r0, =0xfc0648e8\n" //  *"Startup"
 340 "    bl      _CreateTask\n"
 341 //"    blx     sub_fc2ef5b8\n" // j_CreateTask
 342 "    movs    r0, #0\n"
 343 "    pop     {r3, pc}\n"
 344     ".ltorg\n"
 345     );
 346 }
 348 void __attribute__((naked,noinline)) task_Startup_my() {
 349     asm volatile (
 350 // -s=task_Startup -c=26
 351 // task_Startup 0xfc064831
 352 "    push    {r4, lr}\n"
 353 "    bl      sub_fc13515c\n"
 354 "    bl      sub_fc06497c\n"
 355 //"    bl      sub_fc064b10\n" // ->nullsub
 356 "    bl      sub_fc0db5c4\n"
 357 // added for SD card UHS detection https://chdk.setepontos.com/index.php?topic=13089.msg132583#msg132583
 358 "bl sub_010e638b\n" // ref in sub_010e647c following SD1stInit create
 359 //"    bl      sub_fc064b66\n" // StartDiskboot
 360 "    bl      sub_fc091b6e\n"
 361 "    bl      sub_fc0db718\n"
 362 "    bl      sub_fc064c58\n"
 363 "    bl      sub_fc064a90\n"
 364 "    bl      sub_fc0db602\n"
 365 "    bl      sub_fc0bd780\n"
 366 "    bl      sub_fc0db71e\n"
 367 "    bl      sub_fc0780e6_my\n" // CreateTask PhySw
 368 "    bl      CreateTask_spytask\n" 
 369 "    bl      init_required_fw_features\n" // added
 370 "    bl      sub_fc282ac8\n"
 371 "    bl      sub_fc0db734\n"
 372 "    bl      sub_fc0bd718\n"
 373 "    bl      sub_fc134f16\n"
 374 "    bl      sub_fc0bd8de\n"
 375 "    bl      sub_fc0db576\n"
 376 "    bl      sub_fc134ed2\n"
 377 "    bl      sub_fc064c5c\n"
 378 "    bl      sub_fc356c6e\n"
 379 "    bl      sub_fc134ea6\n"
 380 "    pop.w   {r4, lr}\n"
 381 "    b.w     sub_fc135132\n"
 382     ".ltorg\n"
 383     );
 384 }
 386 // -f=chdk -s=0xfc0780e7 -c=18
 387 //taskcreate_physw
 388 void __attribute__((naked,noinline)) sub_fc0780e6_my() {
 389     asm volatile (
 390 "    push    {r3, r4, r5, lr}\n"
 391 "    bl      sub_fc076fb8\n"
 392 "    bl      sub_fc078f90\n" // IsFactoryMode_FW
 393 "    cbnz    r0, loc_fc0780f6\n"
 394 "    bl      sub_fc076f5c\n" // OpLog.Start_FW
 395 "loc_fc0780f6:\n"
 396 "    ldr     r4, =0x000082c8\n" //  physw_run
 397 "    ldr     r0, [r4, #4]\n"
 398 "    cmp     r0, #0\n"
 399 "    bne     loc_fc078112\n"
 400 "    movs    r3, #0\n"
 401 "    str     r3, [sp]\n"
 402 //"    ldr     r3, =0xfc0780c1\n" //  task_PhySw
 403 "    ldr     r3, =mykbd_task\n" //+
 404 "    movs    r1, #0x17\n"
 405 "    ldr     r0, =0xfc078140\n" //  *"PhySw"
 406 "    movw    r2, #0x2000\n" // adjusted 0x800 -> 0x2000
 407 "    blx     sub_fc2ef908\n" // j_CreateTaskStrictly
 408 "    str     r0, [r4, #4]\n"
 409 "loc_fc078112:\n"
 410 "    pop     {r3, r4, r5, pc}\n"
 411     ".ltorg\n"
 412     );
 413 }
 415 // -f=chdk -s=task_InitFileModules -c=16
 416 void __attribute__((naked,noinline)) init_file_modules_task() {
 417     asm volatile (
 418 // task_InitFileModules 0xfc0c22d1
 419 "    push    {r4, r5, r6, lr}\n"
 420 "    bl      sub_fc0c361c\n"
 421 "    movs    r4, r0\n"
 422 "    movw    r5, #0x5006\n"
 423 "    beq     loc_fc0c22e6\n"
 424 "    movs    r1, #0\n"
 425 "    mov     r0, r5\n"
 426 "    bl      _PostLogicalEventToUI\n"
 427 "loc_fc0c22e6:\n"
 428 "    bl      sub_fc0c3646\n"
 429 "    BL      core_spytask_can_start\n" // + CHDK: Set "it's-safe-to-start" flag for spytask
 430 "    cmp     r4, #0\n"
 431 "    bne     loc_fc0c22fa\n"
 432 "    mov     r0, r5\n"
 433 "    pop.w   {r4, r5, r6, lr}\n"
 434 "    movs    r1, #0\n"
 435 "    b.w     _PostLogicalEventToUI\n"
 436 "loc_fc0c22fa:\n"
 437 "    pop     {r4, r5, r6, pc}\n"
 438     ".ltorg\n"
 439     );
 440 }
 441 /*
 442     *** TEMPORARY? workaround ***
 443     Init stuff to avoid asserts on cameras running DryOS r54+
 444     https://chdk.setepontos.com/index.php?topic=12516.0
 445     Execute this only once
 446  */
 447 void init_required_fw_features(void) {
 448     extern void _init_focus_eventflag();
 449     extern void _init_nd_eventflag();
 450 //    extern void _init_nd_semaphore();
 451     //extern void _init_zoom_semaphore(); // for MoveZoomLensWithPoint
_init_focus_eventflag();
_init_nd_eventflag();
 455     // for MoveIrisWithAv, based on fc3d1a74 (but without registers eventprocs)
 456     extern int av_override_semaphore;
 457     extern int _CreateBinarySemaphoreStrictly(int x, int y);
av_override_semaphore = _CreateBinarySemaphoreStrictly(0,0);
 459 //    _init_nd_semaphore();
 460 }
 462 // jogdial override code called from kbd task
 463 // -f=chdk -s=kbd_p2_f -c=77
 464 // kbd_p2_f 0xfc077e8d
 465 void __attribute__((naked,noinline)) kbd_p2_f_my() {
 466     asm volatile(
 467 "    push.w  {r4, r5, r6, r7, r8, lr}\n"
 468 "    ldr     r6, =0x00036c34\n"
 469 "    sub     sp, #0x18\n"
 470 "    add     r7, sp, #8\n"
 471 "    subs    r6, #0xc\n"
 472 "    b       loc_fc077ece\n"
 473 "loc_fc077e9a:\n"
 474 "    ldr     r1, =0x00036c34\n"
 475 "    add     r3, sp, #8\n"
 476 "    ldrb.w  r0, [sp, #4]\n"
 477 "    add     r2, sp, #0x14\n"
 478 "    subs    r1, #0x18\n"
 479 "    bl      sub_fc0760c4\n"
 480 "    cbnz    r0, loc_fc077eb4\n"
 481 "    ldr     r1, [sp, #0x14]\n"
 482 "    movs    r0, #0\n"
 483 "    bl      sub_fc077dfe\n"
 484 "loc_fc077eb4:\n"
 485 "    movs    r0, #2\n"
 486 "loc_fc077eb6:\n"
 487 "    ldr.w   r1, [r7, r0, lsl #2]\n"
 488 "    cbz     r1, loc_fc077ec6\n"
 489 "    ldr.w   r2, [r6, r0, lsl #2]\n"
 490 "    bics    r2, r1\n"
 491 "    str.w   r2, [r6, r0, lsl #2]\n"
 492 "loc_fc077ec6:\n"
 493 "    subs    r0, r0, #1\n"
 494 "    sxtb    r0, r0\n"
 495 "    cmp     r0, #0\n"
 496 "    bge     loc_fc077eb6\n"
 497 "loc_fc077ece:\n"
 498 "    ldr     r0, =0x00036c34\n"
 499 "    add     r1, sp, #4\n"
 500 "    subs    r0, #0xc\n"
 501 "    bl      sub_fc075dc4\n"
 502 "    cmp     r0, #0\n"
 503 "    bne     loc_fc077e9a\n"
 504 "    ldr.w   r8, =0x00036c34\n"
 505 "    movs    r4, #0\n"
 506 "loc_fc077ee2:\n"
 507 "    movs    r5, #0\n"
 508 "    ldr.w   r0, [r6, r4, lsl #2]\n"
 509 "    ldr.w   r1, [r8, r4, lsl #2]\n"
 510 "    ands    r0, r1\n"
 511 "    str.w   r0, [r6, r4, lsl #2]\n"
 512 "    b       loc_fc077f3a\n"
 513 "loc_fc077ef4:\n"
 514 "    lsrs    r0, r5\n"
 515 "    lsls    r0, r0, #0x1f\n"
 516 "    beq     loc_fc077f32\n"
 517 "    ldr     r1, =0x00036c34\n"
 518 "    add.w   r0, r5, r4, lsl #5\n"
 519 "    add     r3, sp, #8\n"
 520 "    subs    r1, #0x18\n"
 521 "    add     r2, sp, #0x14\n"
 522 "    uxtb    r0, r0\n"
 523 "    bl      sub_fc0760c4\n"
 524 "    cbnz    r0, loc_fc077f16\n"
 525 "    ldr     r1, [sp, #0x14]\n"
 526 "    movs    r0, #1\n"
 527 "    bl      sub_fc077dfe\n"
 528 "loc_fc077f16:\n"
 529 "    mov     r0, r4\n"
 530 "    b       loc_fc077f2e\n"
 531 "loc_fc077f1a:\n"
 532 "    ldr.w   r1, [r7, r0, lsl #2]\n"
 533 "    cbz     r1, loc_fc077f2a\n"
 534 "    ldr.w   r2, [r6, r0, lsl #2]\n"
 535 "    bics    r2, r1\n"
 536 "    str.w   r2, [r6, r0, lsl #2]\n"
 537 "loc_fc077f2a:\n"
 538 "    adds    r0, r0, #1\n"
 539 "    sxtb    r0, r0\n"
 540 "loc_fc077f2e:\n"
 541 "    cmp     r0, #3\n"
 542 "    blt     loc_fc077f1a\n"
 543 "loc_fc077f32:\n"
 544 "    ldr.w   r0, [r6, r4, lsl #2]\n"
 545 "    adds    r5, r5, #1\n"
 546 "    uxtb    r5, r5\n"
 547 "loc_fc077f3a:\n"
 548 "    cmp     r0, #0\n"
 549 "    bne     loc_fc077ef4\n"
 550 "    adds    r4, r4, #1\n"
 551 "    sxtb    r4, r4\n"
 552 "    cmp     r4, #3\n"
 553 "    blt     loc_fc077ee2\n"
 554 "    bl      sub_fc075c6e_my\n" // ->
 555 "    add     sp, #0x18\n"
 556 "    pop.w   {r4, r5, r6, r7, r8, pc}\n"
 557 ".ltorg\n"
 558     );
 559 }
 561 //  -f=chdk -s=0xfc075c6f -c=13
 562 void __attribute__((naked,noinline)) sub_fc075c6e_my() {
 563     asm volatile(
 564 "    push    {r4, lr}\n"
 565 "    ldr     r4, =0x00009800\n"
 566 "    ldr     r0, [r4, #0xc]\n"
 567 "    bl      sub_fc0771f0\n"
 568 "    ldr     r0, [r4, #0x10]\n"
 569 "    bl      sub_fc07727a\n"
 570 "    bl      sub_fc0f8224\n"
 571 "    ldr     r0, [r4, #0x14]\n"
 572 "    bl      sub_fc07710c\n"
 573 "    ldr     r0, [r4, #0x18]\n"
 574 "    bl      sub_fc07710c\n"
 575 // re-ordered
 576 //"    pop.w   {r4, lr}\n"
 577 //"    b.w     loc_fc0774e4\n"
 578 "    bl      handle_jogdial\n"  // +
 579 "    cmp     r0, #0\n"          // +
 580 "    beq     no_scroll\n"       // +
 581 "    bl      sub_fc0774e4\n"    // handles scrollwheel(s), void function, no args
 582 "no_scroll:\n"                  // +
 583 "    pop     {r4, pc}\n"        // +
 584 ".ltorg\n"
 585     );
 586 }