root/platform/n/sub/100a/filewrite.c

/* [<][>][^][v][top][bottom][index][help] */

DEFINITIONS

This source file includes following definitions.
  1. filewritetask
  2. sub_FF3C036C_my
  3. sub_FF3C0A2C_my
  4. sub_FF3C04F8_my

   1 /*
   2  * filewrite.c - auto-generated by CHDK code_gen.
   3  */
   4 // Powershot N
   5 #include "lolevel.h"
   6 #include "platform.h"
   7 
   8 typedef struct {
   9     unsigned int address;
  10     unsigned int length;
  11 } cam_ptp_data_chunk; //camera specific structure
  12 
  13 #define MAX_CHUNKS_FOR_JPEG 7 // filewritetask is prepared for this many chunks
  14                               // Found in sub_FF3C0A2C (1.00a) --> "CMP     R0, #6" and
  15                               // corresponds to filewritetask() jump table entries 0-6
  16 /*
  17  * fwt_data_struct: defined here as it's camera dependent
  18  * unneeded members are designated with unkn
  19  * file_offset, full_size, seek_flag only needs to be defined for DryOS>=r50 generation cameras
  20  * pdc is always required
  21  * name is not currently used
  22  */
  23 typedef struct
  24 {
  25     int unkn1;
  26     int file_offset;
  27     int full_size;
  28     int unkn2, unkn3;
  29     cam_ptp_data_chunk pdc[MAX_CHUNKS_FOR_JPEG];
  30     int seek_flag;      // offset from start 0x4c = 76 bytes = 19 words
  31     int unkn4, unkn5;
  32     char name[32];      // offset from start 0x58 = 88 bytes = 22 words
  33 } fwt_data_struct;
  34 // seek_flag is different:
  35 // seek state is activated (from state 0xc, open) when
  36 // (word at 0x4c) AND 0x40
  37 // OR
  38 // write offset is not 0
  39 #define FWT_MUSTSEEK    0x40   // value of the masked seek_flag indicating seek is required
  40 #define FWT_SEEKMASK    0x40   // masks out unneeded bits of seek_flag
  41 
  42 #include "../../../generic/filewrite.c"
  43 //////////////////////////////////////////////////////////////
  44 // filewritetask : based on A2500
  45 //////////////////////////////////////////////////////////////
  46 
  47 /*************************************************************/
  48 //** filewritetask @ 0xFF3C0680 - 0xFF3C0820, length=105
  49 void __attribute__((naked,noinline)) filewritetask() {
  50 asm volatile (
  51 "    STMFD   SP!, {R1-R7,LR} \n"
  52 "    LDR     R5, =0x11630 \n"
  53 "    MOV     R6, #0 \n"
  54 
  55 "loc_FF3C068C:\n"
  56 "    LDR     R0, [R5, #0x10] \n"
  57 "    MOV     R2, #0 \n"
  58 "    ADD     R1, SP, #8 \n"
  59 "    BL      sub_0068BDE4 /*_ReceiveMessageQueue*/ \n"
  60 "    CMP     R0, #0 \n"
  61 "    LDRNE   R1, =0x3EF \n"
  62 "    LDRNE   R0, =0xFF3C084C /*'dwFWrite.c'*/ \n"
  63 "    BLNE    _DebugAssert \n"
  64 "    LDR     R0, [SP, #8] \n"
  65 "    LDR     R1, [R0] \n"
  66 "    CMP     R1, #0xD \n"
  67 "    ADDCC   PC, PC, R1, LSL#2 \n"
  68 "    B       loc_FF3C068C \n"
  69 "    B       loc_FF3C0814 \n"
  70 "    B       loc_FF3C0814 \n"
  71 "    B       loc_FF3C0814 \n"
  72 "    B       loc_FF3C0814 \n"
  73 "    B       loc_FF3C0814 \n"
  74 "    B       loc_FF3C0814 \n"
  75 "    B       loc_FF3C0814 \n"
  76 "    B       loc_FF3C081C \n"
  77 "    B       loc_FF3C06F4 \n"
  78 "    B       loc_FF3C0790 \n"
  79 "    B       loc_FF3C07C0 \n"
  80 "    B       loc_FF3C075C \n"
  81 "    B       loc_FF3C0788 \n"
  82 
  83 "loc_FF3C06F4:\n"
  84 "    MOV     R4, R5 \n"
  85 "    STR     R6, [SP] \n"
  86 
  87 "loc_FF3C06FC:\n"
  88 "    LDR     R0, [R4, #0x10] \n"
  89 "    MOV     R1, SP \n"
  90 "    BL      sub_0068C028 /*_GetNumberOfPostedMessages*/ \n"
  91 "    LDR     R0, [SP] \n"
  92 "    CMP     R0, #0 \n"
  93 "    BEQ     loc_FF3C0728 \n"
  94 "    LDR     R0, [R4, #0x10] \n"
  95 "    MOV     R2, #0 \n"
  96 "    ADD     R1, SP, #4 \n"
  97 "    BL      sub_0068BDE4 /*_ReceiveMessageQueue*/ \n"
  98 "    B       loc_FF3C06FC \n"
  99 
 100 "loc_FF3C0728:\n"
 101 "    LDR     R0, [R4, #4] \n"
 102 "    CMN     R0, #1 \n"
 103 "    BEQ     loc_FF3C0750 \n"
 104 "    BL      fwt_close \n"  // --> Patched. Old value = _Close.
 105 "    MVN     R0, #0 \n"
 106 "    STR     R0, [R4, #4] \n"
 107 "    LDR     R0, =0x25B8B0 \n"
 108 "    BL      sub_FF0ACBDC \n"
 109 "    MOV     R1, #0 \n"
 110 "    BL      sub_FF0AAB00 \n"
 111 
 112 "loc_FF3C0750:\n"
 113 "    LDR     R0, [R4, #0xC] \n"
 114 "    BL      _GiveSemaphore \n"
 115 "    B       loc_FF3C068C \n"
 116 
 117 "loc_FF3C075C:\n"
 118 "    MOV     R4, R0 \n"
 119 "    ADD     R0, R0, #0x58 \n"
 120 "    BL      sub_FF0ACBDC \n"
 121 "    MOV     R1, #0 \n"
 122 "    BL      sub_FF0AA9C4 \n"
 123 "    LDR     R0, [R4, #0xC] \n"
 124 "    BL      sub_FF0A98A0 \n"
 125 "    ADD     R0, R4, #0x58 \n"
 126 
 127 //mod start
 128 "    LDR R3, =ignore_current_write\n" // !!
 129 "    LDR R3, [R3]\n"
 130 "    CMP R3, #0\n"
 131 "    BNE loc_A\n" // skip creating directory
 132 //mod end
 133 "    BL      sub_FF0358B4 \n"
 134 "    ADD     R0, R4, #0x58 \n"
 135 "    B       loc_FF3C07F4 \n"
 136 
 137 "loc_FF3C0788:\n"
 138 "    BL      sub_FF3C036C_my \n"  // --> Patched. Old value = 0xFF3C036C. Open stage
 139 "    B       loc_FF3C068C \n"
 140 
 141 "loc_FF3C0790:\n"
 142 "    LDR     R1, [R0, #4] \n"
 143 "    MOV     R4, R0 \n"
 144 "    LDR     R0, [R5, #4] \n"
 145 "    MOV     R2, #0 \n"
 146 "    BL      fwt_lseek \n"  // --> Patched. Old value = _lseek.
 147 "    CMN     R0, #1 \n"
 148 "    LDREQ   R0, =0x9200013 \n"
 149 "    MOVEQ   R1, R4 \n"
 150 "    STREQ   R0, [R4, #0x10] \n"
 151 "    MOVEQ   R0, #7 \n"
 152 "    BLEQ    sub_FF3C02AC \n"
 153 "    B       loc_FF3C068C \n"
 154 
 155 "loc_FF3C07C0:\n"
 156 "    MOV     R4, R0 \n"
 157 "    LDRSB   R0, [R0, #0x58] \n"
 158 "    CMP     R0, #0 \n"
 159 "    BEQ     loc_FF3C068C \n"
 160 "    STRB    R0, [SP, #4] \n"
 161 "    ADD     R0, R4, #0x58 \n"
 162 "    STRB    R6, [SP, #5] \n"
 163 "    BL      sub_FF0ACBDC \n"
 164 "    MOV     R1, #0 \n"
 165 "    BL      sub_FF0AA9C4 \n"
 166 
 167 //mod start
 168 "    LDR R3, =ignore_current_write\n" // !!
 169 "    LDR R3, [R3]\n"
 170 "    CMP R3, #0\n"
 171 "    BNE loc_B\n" // skip flushing the cache
 172 //mod end
 173 
 174 "    ADD     R0, SP, #4 \n"
 175 "    BL      sub_FF0A98B8 \n"
 176 "loc_B:\n"
 177 "    ADD     R0, R4, #0x58 \n"
 178 
 179 "loc_FF3C07F4:\n"
 180 "loc_A:\n"
 181 "    BL      sub_FF0ACBDC \n"
 182 "    LDR     R1, [R5, #0x18] \n"
 183 "    BL      sub_FF0AAB00 \n"
 184 "    LDR     R1, [R5, #0x14] \n"
 185 "    CMP     R1, #0 \n"
 186 "    LDRNE   R0, [R4, #0x10] \n"
 187 "    BLXNE   R1 \n"
 188 "    B       loc_FF3C068C \n"
 189 
 190 "loc_FF3C0814:\n"
 191 "    BL      sub_FF3C0A2C_my \n"  // --> Patched. Old value = 0xFF3C0A2C. Write stage
 192 "    B       loc_FF3C068C \n"
 193 
 194 "loc_FF3C081C:\n"
 195 "    BL      sub_FF3C04F8_my \n"  // --> Patched. Old value = 0xFF3C04F8. Close stage
 196 "    B       loc_FF3C068C \n"
 197 );
 198 }
 199 
 200 /*************************************************************/
 201 //** sub_FF3C036C_my @ 0xFF3C036C - 0xFF3C04F4, length=99
 202 void __attribute__((naked,noinline)) sub_FF3C036C_my() {
 203 asm volatile (
 204 "    STMFD   SP!, {R4-R8,LR} \n"
 205 "    MOV     R4, R0 \n"
 206 //hook placed here to avoid conditional branch a few instructions below (watch out for registers!)
 207 //"  MOV   R0, R4\n"      //data block start, commented out as R0 is already holding what we need
 208 "    BL filewrite_main_hook\n"
 209 "    MOV     R0, R4\n"      //restore register(s)
 210 //hook end
 211 "    LDR     R0, [R0, #0x4C] \n"
 212 "    SUB     SP, SP, #0x38 \n"
 213 "    TST     R0, #1 \n"
 214 "    BEQ     loc_FF3C04C8 \n"
 215 "    ADD     R0, R4, #0x58 \n"
 216 "    BL      sub_FF0ACBDC \n"
 217 "    MOV     R1, #0 \n"
 218 "    BL      sub_FF0AA9C4 \n"
 219 "    LDR     R0, [R4, #0xC] \n"
 220 "    BL      sub_FF0A98A0 \n"
 221 "    LDR     R0, [R4, #0x4C] \n"
 222 "    LDR     R5, =0x301 \n"
 223 "    TST     R0, #0x10 \n"
 224 "    MOVNE   R5, #9 \n"
 225 "    BNE     loc_FF3C03B8 \n"
 226 "    TST     R0, #0x40 \n"
 227 "    MOVNE   R5, #1 \n"
 228 
 229 "loc_FF3C03B8:\n"
 230 "    TST     R0, #0x20 \n"
 231 "    BNE     loc_FF3C03CC \n"
 232 "    LDR     R0, [R4, #0x54] \n"
 233 "    CMP     R0, #1 \n"
 234 "    BNE     loc_FF3C03D0 \n"
 235 
 236 "loc_FF3C03CC:\n"
 237 "    ORR     R5, R5, #0x8000 \n"
 238 
 239 "loc_FF3C03D0:\n"
 240 "    LDR     R8, =0x1B6 \n"
 241 "    ADD     R7, R4, #0x58 \n"
 242 "    LDR     R6, [R4, #0xC] \n"
 243 "    MOV     R2, R8 \n"
 244 "    MOV     R1, R5 \n"
 245 "    MOV     R0, R7 \n"
 246 "    BL      fwt_open \n"  // --> Patched. Old value = _Open.
 247 "    CMN     R0, #1 \n"
 248 "    BNE     loc_FF3C0450 \n"
 249 "    MOV     R0, R7 \n"
 250 "    BL      sub_FF0358B4 \n"
 251 "    MOV     R2, #0xF \n"
 252 "    MOV     R1, R7 \n"
 253 "    MOV     R0, SP \n"
 254 "    BL      sub_006A90D8 \n"
 255 "    MOV     R0, #0 \n"
 256 "    LDR     R1, =0x41FF \n"
 257 "    STRB    R0, [SP, #0xF] \n"
 258 "    STR     R1, [SP, #0x20] \n"
 259 "    MOV     R1, #0x10 \n"
 260 "    STR     R0, [SP, #0x28] \n"
 261 "    STR     R1, [SP, #0x24] \n"
 262 "    ADD     R1, SP, #0x20 \n"
 263 "    MOV     R0, SP \n"
 264 "    STR     R6, [SP, #0x2C] \n"
 265 "    STR     R6, [SP, #0x30] \n"
 266 "    STR     R6, [SP, #0x34] \n"
 267 "    BL      sub_FF0AA340 \n"
 268 "    MOV     R2, R8 \n"
 269 "    MOV     R1, R5 \n"
 270 "    MOV     R0, R7 \n"
 271 "    BL      _Open \n"
 272 
 273 "loc_FF3C0450:\n"
 274 "    LDR     R6, =0x11630 \n"
 275 "    CMN     R0, #1 \n"
 276 "    MOV     R5, R0 \n"
 277 "    STR     R0, [R6, #4] \n"
 278 "    BNE     loc_FF3C0490 \n"
 279 "    ADD     R0, R4, #0x58 \n"
 280 "    BL      sub_FF0ACBDC \n"
 281 "    LDR     R1, [R6, #0x18] \n"
 282 "    BL      sub_FF0AAB00 \n"
 283 "    LDR     R1, [R6, #0x14] \n"
 284 "    CMP     R1, #0 \n"
 285 "    BEQ     loc_FF3C04F0 \n"
 286 "    ADD     SP, SP, #0x38 \n"
 287 "    LDMFD   SP!, {R4-R8,LR} \n"
 288 "    LDR     R0, =0x9200001 \n"
 289 "    BX      R1 \n"
 290 
 291 "loc_FF3C0490:\n"
 292 "    LDR     R0, =0x25B8B0 \n"
 293 "    MOV     R2, #0x20 \n"
 294 "    ADD     R1, R4, #0x58 \n"
 295 "    BL      sub_006A92C0 \n"
 296 
 297 //mod start
 298 "    LDR R3, =current_write_ignored\n"
 299 "    LDR R3, [R3]\n"
 300 "    CMP R3, #0\n"
 301 "    BNE loc_C\n" // jump over the next block
 302 //mod end
 303 
 304 "    LDR     R0, [R4, #0x4C] \n"
 305 "    TST     R0, #0x80 \n"
 306 "    BEQ     loc_FF3C04C8 \n"
 307 "    LDR     R1, [R4, #8] \n"
 308 "    MOV     R0, R5 \n"
 309 "    BL      sub_FF035584 \n"
 310 "    CMP     R0, #0 \n"
 311 "    MOVEQ   R1, R4 \n"
 312 "    MOVEQ   R0, #7 \n"
 313 "    BEQ     loc_FF3C04EC \n"
 314 
 315 "loc_FF3C04C8:\n"
 316 "loc_C:\n"
 317 "    LDR     R0, [R4, #0x4C] \n"
 318 "    TST     R0, #0x40 \n"
 319 "    LDREQ   R0, [R4, #4] \n"
 320 "    CMPEQ   R0, #0 \n"
 321 "    MOVNE   R1, R4 \n"
 322 "    MOVNE   R0, #9 \n"
 323 "    BLNE    sub_FF3C02AC \n"
 324 "    MOV     R1, R4 \n"
 325 "    MOV     R0, #0 \n"
 326 
 327 "loc_FF3C04EC:\n"
 328 "    BL      sub_FF3C02AC \n"
 329 
 330 "loc_FF3C04F0:\n"
 331 "    ADD     SP, SP, #0x38 \n"
 332 "    LDMFD   SP!, {R4-R8,PC} \n"
 333 );
 334 }
 335 
 336 /*************************************************************/
 337 //** sub_FF3C0A2C_my @ 0xFF3C0A2C - 0xFF3C0B08, length=56
 338 void __attribute__((naked,noinline)) sub_FF3C0A2C_my() {
 339 asm volatile (
 340 "    STMFD   SP!, {R4-R10,LR} \n"
 341 "    MOV     R5, R0 \n"
 342 "    LDR     R0, [R0] \n"
 343 "    CMP     R0, #6 \n"
 344 "    BHI     loc_FF3C0A58 \n"
 345 "    ADD     R0, R5, R0, LSL#3 \n"
 346 "    LDR     R8, [R0, #0x14]! \n"
 347 "    LDR     R7, [R0, #4] \n"
 348 "    CMP     R7, #0 \n"
 349 "    BNE     loc_FF3C0A70 \n"
 350 "    B       loc_FF3C0A64 \n"
 351 
 352 "loc_FF3C0A58:\n"
 353 "    MOV     R1, #0x344 \n"
 354 "    LDR     R0, =0xFF3C084C /*'dwFWrite.c'*/ \n"
 355 "    BL      _DebugAssert \n"
 356 
 357 "loc_FF3C0A64:\n"
 358 "    MOV     R1, R5 \n"
 359 "    MOV     R0, #7 \n"
 360 "    B       loc_FF3C0B04 \n"
 361 
 362 "loc_FF3C0A70:\n"
 363 "    LDR     R9, =0x11630 \n"
 364 "    MOV     R4, R7 \n"
 365 
 366 "loc_FF3C0A78:\n"
 367 "    LDR     R0, [R5, #4] \n"
 368 "    CMP     R4, #0x1000000 \n"
 369 "    MOVLS   R6, R4 \n"
 370 "    MOVHI   R6, #0x1000000 \n"
 371 "    BIC     R1, R0, #0xFF000000 \n"
 372 "    CMP     R1, #0 \n"
 373 "    BICNE   R0, R0, #0xFF000000 \n"
 374 "    RSBNE   R0, R0, #0x1000000 \n"
 375 "    CMPNE   R6, R0 \n"
 376 "    MOVHI   R6, R0 \n"
 377 "    LDR     R0, [R9, #4] \n"
 378 "    MOV     R2, R6 \n"
 379 "    MOV     R1, R8 \n"
 380 "    BL      fwt_write \n"  // --> Patched. Old value = _Write.
 381 "    LDR     R1, [R5, #4] \n"
 382 "    CMP     R6, R0 \n"
 383 "    ADD     R1, R1, R0 \n"
 384 "    STR     R1, [R5, #4] \n"
 385 "    BEQ     loc_FF3C0AD8 \n"
 386 "    CMN     R0, #1 \n"
 387 "    LDRNE   R0, =0x9200015 \n"
 388 "    LDREQ   R0, =0x9200005 \n"
 389 "    STR     R0, [R5, #0x10] \n"
 390 "    B       loc_FF3C0A64 \n"
 391 
 392 "loc_FF3C0AD8:\n"
 393 "    SUB     R4, R4, R0 \n"
 394 "    CMP     R4, R7 \n"
 395 "    LDRCS   R1, =0x36F \n"
 396 "    ADD     R8, R8, R0 \n"
 397 "    LDRCS   R0, =0xFF3C084C /*'dwFWrite.c'*/ \n"
 398 "    BLCS    _DebugAssert \n"
 399 "    CMP     R4, #0 \n"
 400 "    BNE     loc_FF3C0A78 \n"
 401 "    LDR     R0, [R5] \n"
 402 "    MOV     R1, R5 \n"
 403 "    ADD     R0, R0, #1 \n"
 404 
 405 "loc_FF3C0B04:\n"
 406 "    LDMFD   SP!, {R4-R10,LR} \n"
 407 "    B       sub_FF3C02AC \n"
 408 "    .ltorg\n" //+
 409 );
 410 }
 411 
 412 /*************************************************************/
 413 //** sub_FF3C04F8_my @ 0xFF3C04F8 - 0xFF3C0538, length=17
 414 void __attribute__((naked,noinline)) sub_FF3C04F8_my() {
 415 asm volatile (
 416 "    STMFD   SP!, {R4-R6,LR} \n"
 417 "    MOV     R4, R0 \n"
 418 "    LDR     R0, [R0, #0x4C] \n"
 419 "    LDR     R5, =0x11630 \n"
 420 "    TST     R0, #2 \n"
 421 "    SUB     SP, SP, #0x38 \n"
 422 "    BEQ     sub_FF3C0660 \n"
 423 "    LDR     R0, [R5, #4] \n"
 424 "    CMN     R0, #1 \n"
 425 "    BEQ     sub_FF3C054C \n"
 426 "    LDR     R1, [R4, #0x54] \n"
 427 "    LDR     R6, =0x9200003 \n"
 428 "    CMP     R1, #1 \n"
 429 "    BNE     loc_FF3C0538 \n"
 430 //mod start
 431 "    LDR R3, =current_write_ignored\n"
 432 "    LDR R3, [R3]\n"
 433 "    CMP R3, #0\n"
 434 "    BNE loc_D\n" // jump over the next block
 435 //mod end
 436 
 437 "    BL      sub_FF0352D8 \n"
 438 "    B       sub_FF3C053C \n"
 439 
 440 "loc_FF3C0538:\n"
 441 "loc_D:\n"
 442 "    BL      fwt_close \n"  // --> Patched. Old value = _Close.
 443 "    LDR     PC, =0xFF3C053C \n"  // Continue in firmware
 444 );
 445 }

/* [<][>][^][v][top][bottom][index][help] */