Mercurial > nand-ecoscentric
annotate packages/hal/common/current/src/hal_stub.c @ 38:e7ba79f6d3a8 ecos-sw-1999-09-23
Merge from eCos master repository on 1999-09-23-20:10:25-BST
| author | jlarmour |
|---|---|
| date | Thu, 23 Sep 1999 19:52:27 +0000 |
| parents | 29bc183297e1 |
| children | 1370c5e55234 |
| rev | line source |
|---|---|
| 2 | 1 //============================================================================= |
| 2 // | |
| 3 // hal_stub.c | |
| 4 // | |
| 5 // Helper functions for stub, specific to eCos HAL | |
| 6 // | |
| 7 //============================================================================= | |
| 8 //####COPYRIGHTBEGIN#### | |
| 9 // | |
| 10 // ------------------------------------------- | |
| 11 // The contents of this file are subject to the Cygnus eCos Public License | |
| 12 // Version 1.0 (the "License"); you may not use this file except in | |
| 13 // compliance with the License. You may obtain a copy of the License at | |
| 14 // http://sourceware.cygnus.com/ecos | |
| 15 // | |
| 16 // Software distributed under the License is distributed on an "AS IS" | |
| 17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the | |
| 18 // License for the specific language governing rights and limitations under | |
| 19 // the License. | |
| 20 // | |
| 21 // The Original Code is eCos - Embedded Cygnus Operating System, released | |
| 22 // September 30, 1998. | |
| 23 // | |
| 24 // The Initial Developer of the Original Code is Cygnus. Portions created | |
| 25 // by Cygnus are Copyright (C) 1998, 1999 Cygnus Solutions. | |
| 26 // All Rights Reserved. | |
| 27 // ------------------------------------------- | |
| 28 // | |
| 29 //####COPYRIGHTEND#### | |
| 30 //============================================================================= | |
| 31 //#####DESCRIPTIONBEGIN#### | |
| 32 // | |
| 33 // Author(s): jskov (based on powerpc/cogent hal_stub.c) | |
| 34 // Contributors:jskov | |
| 35 // Date: 1999-02-12 | |
| 36 // Purpose: Helper functions for stub, specific to eCos HAL | |
| 37 // Description: Parts of the GDB stub requirements are provided by | |
| 38 // the eCos HAL, rather than target and/or board specific | |
| 39 // code. | |
| 40 // | |
| 41 //####DESCRIPTIONEND#### | |
| 42 // | |
| 43 //============================================================================= | |
| 44 | |
| 45 #include <pkgconf/hal.h> | |
| 46 | |
| 47 #ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS | |
| 48 | |
| 49 #include <cyg/hal/hal_stub.h> // Our header | |
| 50 | |
| 51 #include <cyg/hal/hal_arch.h> // HAL_BREAKINST | |
| 52 #include <cyg/hal/hal_cache.h> // HAL_xCACHE_x | |
| 53 #include <cyg/hal/hal_intr.h> // interrupt disable/restore | |
| 54 | |
| 55 #ifdef CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT | |
| 56 #include <cyg/hal/dbg-threads-api.h> // dbg_currthread_id | |
| 57 #endif | |
| 58 | |
| 59 | |
| 60 //----------------------------------------------------------------------------- | |
| 61 // Extra eCos data. | |
| 62 | |
| 63 // Saved registers. | |
| 64 HAL_SavedRegisters *_hal_registers; | |
| 65 target_register_t registers[NUMREGS]; | |
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66 target_register_t alt_registers[NUMREGS] ; // Thread or saved process state |
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67 target_register_t * _registers = registers; // Pointer to current set of registers |
| 2 | 68 |
| 69 // Interrupt control. | |
| 70 static volatile __PFI __interruptible_control; | |
| 71 | |
| 72 //----------------------------------------------------------------------------- | |
| 73 // Register access | |
| 74 | |
| 75 // Return the currently-saved value corresponding to register REG of | |
| 76 // the exception context. | |
| 77 target_register_t | |
| 78 get_register (regnames_t reg) | |
| 79 { | |
| 80 return _registers[reg]; | |
| 81 } | |
| 82 | |
| 83 // Store VALUE in the register corresponding to WHICH in the exception | |
| 84 // context. | |
| 85 void | |
| 86 put_register (regnames_t which, target_register_t value) | |
| 87 { | |
| 88 _registers[which] = value; | |
| 89 } | |
| 90 | |
| 91 //----------------------------------------------------------------------------- | |
| 92 // Serial stuff | |
| 93 | |
| 94 // Write C to the current serial port. | |
| 95 void | |
| 96 putDebugChar (int c) | |
| 97 { | |
| 98 HAL_STUB_PLATFORM_PUT_CHAR(c); | |
| 99 } | |
| 100 | |
| 101 // Read one character from the current serial port. | |
| 102 int | |
| 103 getDebugChar (void) | |
| 104 { | |
| 105 return HAL_STUB_PLATFORM_GET_CHAR(); | |
| 106 } | |
| 107 | |
| 108 // Set the baud rate for the current serial port. | |
| 109 void | |
| 110 __set_baud_rate (int baud) | |
| 111 { | |
| 112 HAL_STUB_PLATFORM_SET_BAUD_RATE(baud); | |
| 113 } | |
| 114 | |
| 115 //----------------------------------------------------------------------------- | |
| 116 // GDB interrupt (BREAK) support. | |
| 117 | |
| 118 #ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT | |
| 119 | |
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120 |
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121 #if (HAL_BREAKINST_SIZE == 1) |
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122 typedef cyg_uint8 t_inst; |
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123 #elif (HAL_BREAKINST_SIZE == 2) |
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124 typedef cyg_uint16 t_inst; |
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125 #elif (HAL_BREAKINST_SIZE == 4) |
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126 typedef cyg_uint32 t_inst; |
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127 #else |
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128 #error "Don't know how to handle that size" |
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129 #endif |
| 2 | 130 |
| 131 typedef struct | |
| 132 { | |
| 133 t_inst *targetAddr; | |
| 134 t_inst savedInstr; | |
| 135 } instrBuffer; | |
| 136 | |
| 137 static instrBuffer break_buffer; | |
| 138 | |
| 139 void | |
| 140 cyg_hal_gdb_interrupt (target_register_t pc) | |
| 141 { | |
| 142 if (NULL == break_buffer.targetAddr) { | |
| 143 break_buffer.targetAddr = (t_inst*) pc; | |
| 144 break_buffer.savedInstr = *(t_inst*)pc; | |
| 145 *(t_inst*)pc = (t_inst)HAL_BREAKINST; | |
| 146 | |
| 147 __data_cache(CACHE_FLUSH); | |
| 148 __instruction_cache(CACHE_FLUSH); | |
| 149 } | |
| 150 } | |
| 151 | |
| 152 int | |
| 153 cyg_hal_gdb_remove_break (target_register_t pc) | |
| 154 { | |
| 155 if ((t_inst*)pc == break_buffer.targetAddr) { | |
| 156 *(t_inst*)pc = break_buffer.savedInstr; | |
| 157 break_buffer.targetAddr = NULL; | |
| 158 | |
| 159 __data_cache(CACHE_FLUSH); | |
| 160 __instruction_cache(CACHE_FLUSH); | |
| 161 return 1; | |
| 162 } | |
| 163 return 0; | |
| 164 } | |
| 165 | |
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166 |
| 2 | 167 #endif // CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT |
| 168 | |
| 169 // Use this function to disable serial interrupts whenever reply | |
| 170 // characters are expected from GDB. The reason we want to control | |
| 171 // whether the target can be interrupted or not is simply that GDB on | |
| 172 // the host will be sending acknowledge characters/commands while the | |
| 173 // stub is running - if serial interrupts were still active, the | |
| 174 // characters would never reach the (polling) getDebugChar. | |
| 175 static void | |
| 176 interruptible(int state) | |
| 177 { | |
| 178 static int __interrupts_suspended = 0; | |
| 179 | |
| 180 if (__interruptible_control) { | |
| 181 if (state) { | |
| 182 __interrupts_suspended--; | |
| 183 if (0 >= __interrupts_suspended) { | |
| 184 __interrupts_suspended = 0; | |
| 185 __interruptible_control(1); | |
| 186 } | |
| 187 } else { | |
| 188 __interrupts_suspended++; | |
| 189 if (1 == __interrupts_suspended) | |
| 190 __interruptible_control(0); | |
| 191 } | |
| 192 } | |
| 193 } | |
| 194 | |
| 195 //----------------------------------------------------------------------------- | |
| 196 // eCos stub entry and exit magic. | |
| 197 | |
| 198 #ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT | |
| 199 int cyg_hal_gdb_break; | |
| 200 #endif | |
| 201 | |
| 202 // Called at stub *entry* | |
| 203 static void | |
| 204 handle_exception_cleanup( void ) | |
| 205 { | |
| 206 interruptible(0); | |
| 207 | |
| 208 // Expand the HAL_SavedRegisters structure into the GDB register | |
| 209 // array format. | |
| 210 HAL_GET_GDB_REGISTERS(®isters[0], _hal_registers); | |
| 211 _registers = ®isters[0]; | |
| 212 | |
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213 #ifdef HAL_STUB_PLATFORM_STUBS_FIXUP |
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214 // Some architectures may need to fix the PC in case of a partial |
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215 // or fully executed trap instruction. GDB only takes correct action |
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216 // when the PC is pointing to the breakpoint instruction it set. |
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217 // |
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218 // Most architectures would leave PC pointing at the trap |
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219 // instruction itself though, and so do not need to do anything |
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220 // special. |
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221 HAL_STUB_PLATFORM_STUBS_FIXUP(); |
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222 #endif |
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223 |
| 2 | 224 #ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT |
| 225 // FIXME: (there may be a better way to do this) | |
| 226 // If we hit a breakpoint set by the gdb interrupt stub, make it | |
| 227 // seem like an interrupt rather than having hit a breakpoint. | |
| 228 if (cyg_hal_gdb_remove_break(get_register (PC))) | |
| 229 cyg_hal_gdb_break = 1; | |
| 230 else | |
| 231 cyg_hal_gdb_break = 0; | |
| 232 #endif | |
| 233 } | |
| 234 | |
| 235 // Called at stub *exit* | |
| 236 static void | |
| 237 handle_exception_init( void ) | |
| 238 { | |
| 239 // Compact register array again. | |
| 240 HAL_SET_GDB_REGISTERS(_hal_registers, ®isters[0]); | |
| 241 | |
| 242 interruptible(1); | |
| 243 } | |
| 244 | |
| 245 | |
| 246 //----------------------------------------------------------------------------- | |
| 247 // Initialization. | |
| 248 | |
| 249 // Signal handler. | |
| 250 int | |
| 251 cyg_hal_process_signal (int signal) | |
| 252 { | |
| 253 // We don't care about the signal (atm). | |
| 254 return 0; | |
| 255 } | |
| 256 | |
| 257 // Install the standard set of trap handlers for the stub. | |
| 258 void | |
| 259 __install_traps (void) | |
| 260 { | |
| 261 // Set signal handling vector so we can treat 'C<signum>' as 'c'. | |
| 262 __process_signal_vec = &cyg_hal_process_signal; | |
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263 // Set exit vector to reset vector. This will allow automatic reset on |
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264 // some platforms. |
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265 __process_exit_vec = &__reset; |
| 2 | 266 |
| 267 __cleanup_vec = &handle_exception_cleanup; | |
| 268 __init_vec = &handle_exception_init; | |
| 269 | |
| 270 #ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT | |
| 271 // Control of GDB interrupts. | |
| 272 __interruptible_control = HAL_STUB_PLATFORM_INTERRUPTIBLE; | |
| 273 #endif | |
| 274 | |
| 275 // Nothing further to do, handle_exception will be called when an | |
| 276 // exception occurs. | |
| 277 } | |
| 278 | |
| 279 // Initialize the hardware. | |
| 280 void | |
| 281 initHardware (void) | |
| 282 { | |
| 283 static int initialized = 0; | |
| 284 | |
| 285 if (!initialized) { | |
| 286 initialized = 1; | |
| 287 | |
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288 #ifdef HAL_STUB_PLATFORM_INIT |
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289 // If the platform defines any initialization code, call it here. |
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290 HAL_STUB_PLATFORM_INIT(); |
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291 #endif |
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292 |
| 2 | 293 // Get serial port initialized. |
| 294 HAL_STUB_PLATFORM_INIT_SERIAL(); | |
| 295 | |
| 296 #ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT | |
| 297 // Get interrupt handler initialized. | |
| 298 HAL_STUB_PLATFORM_INIT_BREAK_IRQ(); | |
| 299 #endif | |
| 300 | |
| 301 #ifdef CYG_HAL_STARTUP_STUBS | |
| 302 // There may be extra initialization required when configured | |
| 303 // for stubs startup. | |
| 304 HAL_STUB_PLATFORM_STUBS_INIT(); | |
| 305 #endif | |
| 306 } | |
| 307 } | |
| 308 | |
| 309 // Reset the board. | |
| 310 void | |
| 311 __reset (void) | |
| 312 { | |
| 313 HAL_STUB_PLATFORM_RESET(); | |
| 314 } | |
| 315 | |
| 316 //----------------------------------------------------------------------------- | |
| 317 // Breakpoint support. | |
| 318 | |
| 319 #ifndef CYGPKG_HAL_ARM | |
| 320 // This function will generate a breakpoint exception. It is used at | |
| 321 // the beginning of a program to sync up with a debugger and can be | |
| 322 // used otherwise as a quick means to stop program execution and | |
| 323 // "break" into the debugger. | |
| 324 void | |
| 325 breakpoint() | |
| 326 { | |
| 327 HAL_BREAKPOINT(_breakinst); | |
| 328 } | |
| 329 | |
| 330 // This function returns the opcode for a 'trap' instruction. | |
| 331 unsigned long | |
| 332 __break_opcode () | |
| 333 { | |
| 334 return HAL_BREAKINST; | |
| 335 } | |
| 336 #endif | |
| 337 | |
| 338 // FIXME: Add support for multiple breakpoints (libstub/bplist-dynamic.c) | |
| 339 int __set_breakpoint (target_register_t addr) { return 0; } | |
| 340 int __remove_breakpoint (target_register_t addr) { return 0; } | |
| 341 | |
| 342 //----------------------------------------------------------------------------- | |
| 343 // Write the 'T' packet in BUFFER. SIGVAL is the signal the program received. | |
| 344 void | |
| 345 __build_t_packet (int sigval, char *buf) | |
| 346 { | |
| 347 target_register_t addr; | |
| 348 char *ptr = buf; | |
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349 target_register_t sp; |
| 2 | 350 |
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351 sp = (target_register_t) get_register (SP); |
| 2 | 352 |
| 353 *ptr++ = 'T'; | |
| 354 *ptr++ = __tohex (sigval >> 4); | |
| 355 *ptr++ = __tohex (sigval); | |
| 356 | |
| 357 #ifdef CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT | |
| 358 // Include thread ID if thread manipulation is required. | |
| 359 { | |
| 360 int id; | |
| 361 | |
| 362 *ptr++ = 't'; | |
| 363 *ptr++ = 'h'; | |
| 364 *ptr++ = 'r'; | |
| 365 *ptr++ = 'e'; | |
| 366 *ptr++ = 'a'; | |
| 367 *ptr++ = 'd'; | |
| 368 *ptr++ = ':'; | |
| 369 | |
| 370 #if (CYG_BYTEORDER == CYG_MSBFIRST) | |
| 371 id = dbg_currthread_id (); | |
| 372 #else | |
| 373 // FIXME: Temporary workaround for PR 18903. Thread ID must be | |
| 374 // big-endian in the T packet. | |
| 375 { | |
| 376 unsigned char* bep = (unsigned char*)&id; | |
| 377 int be_id; | |
| 378 | |
| 379 be_id = dbg_currthread_id (); | |
| 380 *bep++ = (be_id >> 24) & 0xff ; | |
| 381 *bep++ = (be_id >> 16) & 0xff ; | |
| 382 *bep++ = (be_id >> 8) & 0xff ; | |
| 383 *bep++ = (be_id & 0xff) ; | |
| 384 } | |
| 385 #endif | |
| 386 ptr = __mem2hex((char *)&id, ptr, sizeof(id), 0); | |
| 387 *ptr++ = ';'; | |
| 388 } | |
| 389 #endif | |
| 390 | |
| 391 *ptr++ = __tohex (PC >> 4); | |
| 392 *ptr++ = __tohex (PC); | |
| 393 *ptr++ = ':'; | |
| 394 addr = get_register (PC); | |
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395 ptr = __mem2hex((char *)&addr, ptr, REGSIZE(PC), 0); |
| 2 | 396 *ptr++ = ';'; |
| 397 | |
| 398 *ptr++ = __tohex (SP >> 4); | |
| 399 *ptr++ = __tohex (SP); | |
| 400 *ptr++ = ':'; | |
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401 ptr = __mem2hex((char *)&sp, ptr, REGSIZE(SP), 0); |
| 2 | 402 *ptr++ = ';'; |
| 403 | |
| 404 *ptr++ = 0; | |
| 405 } | |
| 406 | |
| 407 | |
| 408 //----------------------------------------------------------------------------- | |
| 409 // Cache functions. | |
| 410 | |
| 411 // Perform the specified operation on the instruction cache. | |
| 412 // Returns 1 if the cache is enabled, 0 otherwise. | |
| 413 int | |
| 414 __instruction_cache (cache_control_t request) | |
| 415 { | |
| 416 int state = 1; | |
| 417 | |
| 418 switch (request) { | |
| 419 case CACHE_ENABLE: | |
| 420 HAL_ICACHE_ENABLE(); | |
| 421 break; | |
| 422 case CACHE_DISABLE: | |
| 423 HAL_ICACHE_DISABLE(); | |
| 424 state = 0; | |
| 425 break; | |
| 426 case CACHE_FLUSH: | |
| 427 HAL_ICACHE_SYNC(); | |
| 428 break; | |
| 429 case CACHE_NOOP: | |
| 430 /* fall through */ | |
| 431 default: | |
| 432 break; | |
| 433 } | |
| 434 | |
| 435 #ifdef HAL_ICACHE_IS_ENABLED | |
| 436 HAL_ICACHE_IS_ENABLED(state); | |
| 437 #endif | |
| 438 | |
| 439 return state; | |
| 440 } | |
| 441 | |
| 442 // Perform the specified operation on the data cache. | |
| 443 // Returns 1 if the cache is enabled, 0 otherwise. | |
| 444 int | |
| 445 __data_cache (cache_control_t request) | |
| 446 { | |
| 447 int state = 1; | |
| 448 | |
| 449 switch (request) { | |
| 450 case CACHE_ENABLE: | |
| 451 HAL_DCACHE_ENABLE(); | |
| 452 break; | |
| 453 case CACHE_DISABLE: | |
| 454 HAL_DCACHE_DISABLE(); | |
| 455 state = 0; | |
| 456 break; | |
| 457 case CACHE_FLUSH: | |
| 458 HAL_DCACHE_SYNC(); | |
| 459 break; | |
| 460 case CACHE_NOOP: | |
| 461 /* fall through */ | |
| 462 default: | |
| 463 break; | |
| 464 } | |
| 465 #ifdef HAL_DCACHE_IS_ENABLED | |
| 466 HAL_DCACHE_IS_ENABLED(state); | |
| 467 #endif | |
| 468 | |
| 469 return state; | |
| 470 } | |
| 471 | |
| 472 //----------------------------------------------------------------------------- | |
| 473 // Memory accessor functions. | |
| 474 | |
| 475 void *__mem_fault_handler = (void *)0; | |
| 476 | |
| 477 /* These are the "arguments" to __do_read_mem and __do_write_mem, | |
| 478 which are passed as globals to avoid squeezing them thru | |
| 479 __set_mem_fault_trap. */ | |
| 480 | |
| 481 static volatile target_register_t memCount; | |
| 482 | |
| 483 static void | |
| 484 __do_copy_mem (unsigned char* src, unsigned char* dst) | |
| 485 { | |
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486 unsigned long *long_dst; |
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487 unsigned long *long_src; |
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488 unsigned short *short_dst; |
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489 unsigned short *short_src; |
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490 |
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491 __mem_fault = 1; /* Defaults to 'fail'. Is cleared */ |
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492 /* when the copy loop completes. */ |
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493 __mem_fault_handler = &&err; |
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494 |
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495 // See if it's safe to do multi-byte, aligned operations |
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496 while (memCount) { |
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497 if ((memCount >= sizeof(long)) && |
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498 (((target_register_t)dst & (sizeof(long)-1)) == 0) && |
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499 (((target_register_t)src & (sizeof(long)-1)) == 0)) { |
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500 |
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501 long_dst = (unsigned long *)dst; |
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502 long_src = (unsigned long *)src; |
| 2 | 503 |
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504 *long_dst++ = *long_src++; |
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505 memCount -= sizeof(long); |
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506 |
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507 dst = (unsigned char *)long_dst; |
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508 src = (unsigned char *)long_src; |
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509 } else if ((memCount >= sizeof(short)) && |
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510 (((target_register_t)dst & (sizeof(short)-1)) == 0) && |
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511 (((target_register_t)src & (sizeof(short)-1)) == 0)) { |
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512 |
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513 short_dst = (unsigned short *)dst; |
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514 short_src = (unsigned short *)src; |
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515 |
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516 *short_dst++ = *short_src++; |
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517 memCount -= sizeof(short); |
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518 |
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519 dst = (unsigned char *)short_dst; |
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520 src = (unsigned char *)short_src; |
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521 } else { |
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522 *dst++ = *src++; |
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523 memCount--; |
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524 } |
| 2 | 525 } |
| 526 | |
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527 __mem_fault = 0; |
| 2 | 528 |
| 529 err: | |
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530 __mem_fault_handler = (void *)0; |
| 2 | 531 } |
| 532 | |
| 533 /* | |
| 534 * __read_mem_safe: | |
| 535 * Get contents of target memory, abort on error. | |
| 536 */ | |
| 537 | |
| 538 int | |
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539 __read_mem_safe (void *dst, void *src, int count) |
| 2 | 540 { |
| 541 memCount = count; | |
| 542 __do_copy_mem((unsigned char*) src, (unsigned char*) dst); | |
| 543 return count - memCount; // return number of bytes successfully read | |
| 544 } | |
| 545 | |
| 546 /* | |
| 547 * __write_mem_safe: | |
| 548 * Set contents of target memory, abort on error. | |
| 549 */ | |
| 550 | |
| 551 int | |
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552 __write_mem_safe (void *src, void *dst, int count) |
| 2 | 553 { |
| 554 memCount = count; | |
| 555 __do_copy_mem((unsigned char*) src, (unsigned char*) dst); | |
| 556 return count - memCount; // return number of bytes successfully written | |
| 557 } | |
| 558 | |
| 559 //----------------------------------------------------------------------------- | |
| 560 // Target extras?! | |
| 561 int | |
| 562 __process_target_query(char * pkt, char * out, int maxOut) | |
| 563 { return 0 ; } | |
| 564 int | |
| 565 __process_target_set(char * pkt, char * out, int maxout) | |
| 566 { return 0 ; } | |
| 567 int | |
| 568 __process_target_packet(char * pkt, char * out, int maxout) | |
| 569 { return 0 ; } | |
| 570 | |
| 571 // GDB string output, making sure interrupts are disabled. | |
| 572 // This function gets used by some diag output functions. | |
| 573 void | |
| 574 hal_output_gdb_string(target_register_t str, int string_len) | |
| 575 { | |
| 576 unsigned long __state; | |
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577 HAL_DISABLE_INTERRUPTS(__state); |
| 2 | 578 __output_gdb_string(str, string_len); |
| 579 HAL_RESTORE_INTERRUPTS(__state); | |
| 580 } | |
| 581 | |
| 582 #endif // CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS |