Mercurial > nand-ecoscentric
annotate packages/hal/common/current/src/hal_stub.c @ 34:29bc183297e1 ecos-sw-1999-09-02
Merge from eCos master repository on 1999-09-02-16:26:10-BST
| author | jlarmour |
|---|---|
| date | Thu, 02 Sep 1999 16:11:22 +0000 |
| parents | 641b639be825 |
| children | e7ba79f6d3a8 |
| 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 #if (HAL_BREAKINST_SIZE == 1) |
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121 typedef cyg_uint8 t_inst; |
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122 #elif (HAL_BREAKINST_SIZE == 2) |
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123 typedef cyg_uint16 t_inst; |
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124 #elif (HAL_BREAKINST_SIZE == 4) |
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125 typedef cyg_uint32 t_inst; |
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126 #else |
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127 #error "Don't know how to handle that size" |
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128 #endif |
| 2 | 129 |
| 130 typedef struct | |
| 131 { | |
| 132 t_inst *targetAddr; | |
| 133 t_inst savedInstr; | |
| 134 } instrBuffer; | |
| 135 | |
| 136 static instrBuffer break_buffer; | |
| 137 | |
| 138 void | |
| 139 cyg_hal_gdb_interrupt (target_register_t pc) | |
| 140 { | |
| 141 if (NULL == break_buffer.targetAddr) { | |
| 142 break_buffer.targetAddr = (t_inst*) pc; | |
| 143 break_buffer.savedInstr = *(t_inst*)pc; | |
| 144 *(t_inst*)pc = (t_inst)HAL_BREAKINST; | |
| 145 | |
| 146 __data_cache(CACHE_FLUSH); | |
| 147 __instruction_cache(CACHE_FLUSH); | |
| 148 } | |
| 149 } | |
| 150 | |
| 151 int | |
| 152 cyg_hal_gdb_remove_break (target_register_t pc) | |
| 153 { | |
| 154 if ((t_inst*)pc == break_buffer.targetAddr) { | |
| 155 *(t_inst*)pc = break_buffer.savedInstr; | |
| 156 break_buffer.targetAddr = NULL; | |
| 157 | |
| 158 __data_cache(CACHE_FLUSH); | |
| 159 __instruction_cache(CACHE_FLUSH); | |
| 160 return 1; | |
| 161 } | |
| 162 return 0; | |
| 163 } | |
| 164 | |
| 165 #endif // CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT | |
| 166 | |
| 167 // Use this function to disable serial interrupts whenever reply | |
| 168 // characters are expected from GDB. The reason we want to control | |
| 169 // whether the target can be interrupted or not is simply that GDB on | |
| 170 // the host will be sending acknowledge characters/commands while the | |
| 171 // stub is running - if serial interrupts were still active, the | |
| 172 // characters would never reach the (polling) getDebugChar. | |
| 173 static void | |
| 174 interruptible(int state) | |
| 175 { | |
| 176 static int __interrupts_suspended = 0; | |
| 177 | |
| 178 if (__interruptible_control) { | |
| 179 if (state) { | |
| 180 __interrupts_suspended--; | |
| 181 if (0 >= __interrupts_suspended) { | |
| 182 __interrupts_suspended = 0; | |
| 183 __interruptible_control(1); | |
| 184 } | |
| 185 } else { | |
| 186 __interrupts_suspended++; | |
| 187 if (1 == __interrupts_suspended) | |
| 188 __interruptible_control(0); | |
| 189 } | |
| 190 } | |
| 191 } | |
| 192 | |
| 193 //----------------------------------------------------------------------------- | |
| 194 // eCos stub entry and exit magic. | |
| 195 | |
| 196 #ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT | |
| 197 int cyg_hal_gdb_break; | |
| 198 #endif | |
| 199 | |
| 200 // Called at stub *entry* | |
| 201 static void | |
| 202 handle_exception_cleanup( void ) | |
| 203 { | |
| 204 interruptible(0); | |
| 205 | |
| 206 // Expand the HAL_SavedRegisters structure into the GDB register | |
| 207 // array format. | |
| 208 HAL_GET_GDB_REGISTERS(®isters[0], _hal_registers); | |
| 209 _registers = ®isters[0]; | |
| 210 | |
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211 #ifdef HAL_STUB_PLATFORM_STUBS_FIXUP |
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212 // Some architectures may need to fix the PC in case of a partial |
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213 // or fully executed trap instruction. GDB only takes correct action |
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214 // when the PC is pointing to the breakpoint instruction it set. |
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215 // |
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216 // Most architectures would leave PC pointing at the trap |
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217 // instruction itself though, and so do not need to do anything |
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218 // special. |
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219 HAL_STUB_PLATFORM_STUBS_FIXUP(); |
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220 #endif |
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221 |
| 2 | 222 #ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT |
| 223 // FIXME: (there may be a better way to do this) | |
| 224 // If we hit a breakpoint set by the gdb interrupt stub, make it | |
| 225 // seem like an interrupt rather than having hit a breakpoint. | |
| 226 if (cyg_hal_gdb_remove_break(get_register (PC))) | |
| 227 cyg_hal_gdb_break = 1; | |
| 228 else | |
| 229 cyg_hal_gdb_break = 0; | |
| 230 #endif | |
| 231 } | |
| 232 | |
| 233 // Called at stub *exit* | |
| 234 static void | |
| 235 handle_exception_init( void ) | |
| 236 { | |
| 237 // Compact register array again. | |
| 238 HAL_SET_GDB_REGISTERS(_hal_registers, ®isters[0]); | |
| 239 | |
| 240 interruptible(1); | |
| 241 } | |
| 242 | |
| 243 | |
| 244 //----------------------------------------------------------------------------- | |
| 245 // Initialization. | |
| 246 | |
| 247 // Signal handler. | |
| 248 int | |
| 249 cyg_hal_process_signal (int signal) | |
| 250 { | |
| 251 // We don't care about the signal (atm). | |
| 252 return 0; | |
| 253 } | |
| 254 | |
| 255 // Install the standard set of trap handlers for the stub. | |
| 256 void | |
| 257 __install_traps (void) | |
| 258 { | |
| 259 // Set signal handling vector so we can treat 'C<signum>' as 'c'. | |
| 260 __process_signal_vec = &cyg_hal_process_signal; | |
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261 // Set exit vector to reset vector. This will allow automatic reset on |
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262 // some platforms. |
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263 __process_exit_vec = &__reset; |
| 2 | 264 |
| 265 __cleanup_vec = &handle_exception_cleanup; | |
| 266 __init_vec = &handle_exception_init; | |
| 267 | |
| 268 #ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT | |
| 269 // Control of GDB interrupts. | |
| 270 __interruptible_control = HAL_STUB_PLATFORM_INTERRUPTIBLE; | |
| 271 #endif | |
| 272 | |
| 273 // Nothing further to do, handle_exception will be called when an | |
| 274 // exception occurs. | |
| 275 } | |
| 276 | |
| 277 // Initialize the hardware. | |
| 278 void | |
| 279 initHardware (void) | |
| 280 { | |
| 281 static int initialized = 0; | |
| 282 | |
| 283 if (!initialized) { | |
| 284 initialized = 1; | |
| 285 | |
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286 #ifdef HAL_STUB_PLATFORM_INIT |
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287 // If the platform defines any initialization code, call it here. |
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288 HAL_STUB_PLATFORM_INIT(); |
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289 #endif |
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290 |
| 2 | 291 // Get serial port initialized. |
| 292 HAL_STUB_PLATFORM_INIT_SERIAL(); | |
| 293 | |
| 294 #ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT | |
| 295 // Get interrupt handler initialized. | |
| 296 HAL_STUB_PLATFORM_INIT_BREAK_IRQ(); | |
| 297 #endif | |
| 298 | |
| 299 #ifdef CYG_HAL_STARTUP_STUBS | |
| 300 // There may be extra initialization required when configured | |
| 301 // for stubs startup. | |
| 302 HAL_STUB_PLATFORM_STUBS_INIT(); | |
| 303 #endif | |
| 304 } | |
| 305 } | |
| 306 | |
| 307 // Reset the board. | |
| 308 void | |
| 309 __reset (void) | |
| 310 { | |
| 311 HAL_STUB_PLATFORM_RESET(); | |
| 312 } | |
| 313 | |
| 314 //----------------------------------------------------------------------------- | |
| 315 // Breakpoint support. | |
| 316 | |
| 317 #ifndef CYGPKG_HAL_ARM | |
| 318 // This function will generate a breakpoint exception. It is used at | |
| 319 // the beginning of a program to sync up with a debugger and can be | |
| 320 // used otherwise as a quick means to stop program execution and | |
| 321 // "break" into the debugger. | |
| 322 void | |
| 323 breakpoint() | |
| 324 { | |
| 325 HAL_BREAKPOINT(_breakinst); | |
| 326 } | |
| 327 | |
| 328 // This function returns the opcode for a 'trap' instruction. | |
| 329 unsigned long | |
| 330 __break_opcode () | |
| 331 { | |
| 332 return HAL_BREAKINST; | |
| 333 } | |
| 334 #endif | |
| 335 | |
| 336 // FIXME: Add support for multiple breakpoints (libstub/bplist-dynamic.c) | |
| 337 int __set_breakpoint (target_register_t addr) { return 0; } | |
| 338 int __remove_breakpoint (target_register_t addr) { return 0; } | |
| 339 | |
| 340 //----------------------------------------------------------------------------- | |
| 341 // Write the 'T' packet in BUFFER. SIGVAL is the signal the program received. | |
| 342 void | |
| 343 __build_t_packet (int sigval, char *buf) | |
| 344 { | |
| 345 target_register_t addr; | |
| 346 char *ptr = buf; | |
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347 target_register_t sp; |
| 2 | 348 |
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349 sp = (target_register_t) get_register (SP); |
| 2 | 350 |
| 351 *ptr++ = 'T'; | |
| 352 *ptr++ = __tohex (sigval >> 4); | |
| 353 *ptr++ = __tohex (sigval); | |
| 354 | |
| 355 #ifdef CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT | |
| 356 // Include thread ID if thread manipulation is required. | |
| 357 { | |
| 358 int id; | |
| 359 | |
| 360 *ptr++ = 't'; | |
| 361 *ptr++ = 'h'; | |
| 362 *ptr++ = 'r'; | |
| 363 *ptr++ = 'e'; | |
| 364 *ptr++ = 'a'; | |
| 365 *ptr++ = 'd'; | |
| 366 *ptr++ = ':'; | |
| 367 | |
| 368 #if (CYG_BYTEORDER == CYG_MSBFIRST) | |
| 369 id = dbg_currthread_id (); | |
| 370 #else | |
| 371 // FIXME: Temporary workaround for PR 18903. Thread ID must be | |
| 372 // big-endian in the T packet. | |
| 373 { | |
| 374 unsigned char* bep = (unsigned char*)&id; | |
| 375 int be_id; | |
| 376 | |
| 377 be_id = dbg_currthread_id (); | |
| 378 *bep++ = (be_id >> 24) & 0xff ; | |
| 379 *bep++ = (be_id >> 16) & 0xff ; | |
| 380 *bep++ = (be_id >> 8) & 0xff ; | |
| 381 *bep++ = (be_id & 0xff) ; | |
| 382 } | |
| 383 #endif | |
| 384 ptr = __mem2hex((char *)&id, ptr, sizeof(id), 0); | |
| 385 *ptr++ = ';'; | |
| 386 } | |
| 387 #endif | |
| 388 | |
| 389 *ptr++ = __tohex (PC >> 4); | |
| 390 *ptr++ = __tohex (PC); | |
| 391 *ptr++ = ':'; | |
| 392 addr = get_register (PC); | |
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393 ptr = __mem2hex((char *)&addr, ptr, REGSIZE(PC), 0); |
| 2 | 394 *ptr++ = ';'; |
| 395 | |
| 396 *ptr++ = __tohex (SP >> 4); | |
| 397 *ptr++ = __tohex (SP); | |
| 398 *ptr++ = ':'; | |
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399 ptr = __mem2hex((char *)&sp, ptr, REGSIZE(SP), 0); |
| 2 | 400 *ptr++ = ';'; |
| 401 | |
| 402 *ptr++ = 0; | |
| 403 } | |
| 404 | |
| 405 | |
| 406 //----------------------------------------------------------------------------- | |
| 407 // Cache functions. | |
| 408 | |
| 409 // Perform the specified operation on the instruction cache. | |
| 410 // Returns 1 if the cache is enabled, 0 otherwise. | |
| 411 int | |
| 412 __instruction_cache (cache_control_t request) | |
| 413 { | |
| 414 int state = 1; | |
| 415 | |
| 416 switch (request) { | |
| 417 case CACHE_ENABLE: | |
| 418 HAL_ICACHE_ENABLE(); | |
| 419 break; | |
| 420 case CACHE_DISABLE: | |
| 421 HAL_ICACHE_DISABLE(); | |
| 422 state = 0; | |
| 423 break; | |
| 424 case CACHE_FLUSH: | |
| 425 HAL_ICACHE_SYNC(); | |
| 426 break; | |
| 427 case CACHE_NOOP: | |
| 428 /* fall through */ | |
| 429 default: | |
| 430 break; | |
| 431 } | |
| 432 | |
| 433 #ifdef HAL_ICACHE_IS_ENABLED | |
| 434 HAL_ICACHE_IS_ENABLED(state); | |
| 435 #endif | |
| 436 | |
| 437 return state; | |
| 438 } | |
| 439 | |
| 440 // Perform the specified operation on the data cache. | |
| 441 // Returns 1 if the cache is enabled, 0 otherwise. | |
| 442 int | |
| 443 __data_cache (cache_control_t request) | |
| 444 { | |
| 445 int state = 1; | |
| 446 | |
| 447 switch (request) { | |
| 448 case CACHE_ENABLE: | |
| 449 HAL_DCACHE_ENABLE(); | |
| 450 break; | |
| 451 case CACHE_DISABLE: | |
| 452 HAL_DCACHE_DISABLE(); | |
| 453 state = 0; | |
| 454 break; | |
| 455 case CACHE_FLUSH: | |
| 456 HAL_DCACHE_SYNC(); | |
| 457 break; | |
| 458 case CACHE_NOOP: | |
| 459 /* fall through */ | |
| 460 default: | |
| 461 break; | |
| 462 } | |
| 463 #ifdef HAL_DCACHE_IS_ENABLED | |
| 464 HAL_DCACHE_IS_ENABLED(state); | |
| 465 #endif | |
| 466 | |
| 467 return state; | |
| 468 } | |
| 469 | |
| 470 //----------------------------------------------------------------------------- | |
| 471 // Memory accessor functions. | |
| 472 | |
| 473 void *__mem_fault_handler = (void *)0; | |
| 474 | |
| 475 /* These are the "arguments" to __do_read_mem and __do_write_mem, | |
| 476 which are passed as globals to avoid squeezing them thru | |
| 477 __set_mem_fault_trap. */ | |
| 478 | |
| 479 static volatile target_register_t memCount; | |
| 480 | |
| 481 static void | |
| 482 __do_copy_mem (unsigned char* src, unsigned char* dst) | |
| 483 { | |
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484 unsigned long *long_dst; |
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485 unsigned long *long_src; |
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486 unsigned short *short_dst; |
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487 unsigned short *short_src; |
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488 |
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489 __mem_fault = 1; /* Defaults to 'fail'. Is cleared */ |
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490 /* when the copy loop completes. */ |
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491 __mem_fault_handler = &&err; |
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492 |
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493 // See if it's safe to do multi-byte, aligned operations |
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494 while (memCount) { |
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495 if ((memCount >= sizeof(long)) && |
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496 (((target_register_t)dst & (sizeof(long)-1)) == 0) && |
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497 (((target_register_t)src & (sizeof(long)-1)) == 0)) { |
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498 |
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499 long_dst = (unsigned long *)dst; |
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500 long_src = (unsigned long *)src; |
| 2 | 501 |
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502 *long_dst++ = *long_src++; |
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503 memCount -= sizeof(long); |
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504 |
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505 dst = (unsigned char *)long_dst; |
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506 src = (unsigned char *)long_src; |
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507 } else if ((memCount >= sizeof(short)) && |
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508 (((target_register_t)dst & (sizeof(short)-1)) == 0) && |
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509 (((target_register_t)src & (sizeof(short)-1)) == 0)) { |
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510 |
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511 short_dst = (unsigned short *)dst; |
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512 short_src = (unsigned short *)src; |
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513 |
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514 *short_dst++ = *short_src++; |
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515 memCount -= sizeof(short); |
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516 |
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517 dst = (unsigned char *)short_dst; |
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518 src = (unsigned char *)short_src; |
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519 } else { |
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520 *dst++ = *src++; |
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521 memCount--; |
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522 } |
| 2 | 523 } |
| 524 | |
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525 __mem_fault = 0; |
| 2 | 526 |
| 527 err: | |
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528 __mem_fault_handler = (void *)0; |
| 2 | 529 } |
| 530 | |
| 531 /* | |
| 532 * __read_mem_safe: | |
| 533 * Get contents of target memory, abort on error. | |
| 534 */ | |
| 535 | |
| 536 int | |
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537 __read_mem_safe (void *dst, void *src, int count) |
| 2 | 538 { |
| 539 memCount = count; | |
| 540 __do_copy_mem((unsigned char*) src, (unsigned char*) dst); | |
| 541 return count - memCount; // return number of bytes successfully read | |
| 542 } | |
| 543 | |
| 544 /* | |
| 545 * __write_mem_safe: | |
| 546 * Set contents of target memory, abort on error. | |
| 547 */ | |
| 548 | |
| 549 int | |
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550 __write_mem_safe (void *src, void *dst, int count) |
| 2 | 551 { |
| 552 memCount = count; | |
| 553 __do_copy_mem((unsigned char*) src, (unsigned char*) dst); | |
| 554 return count - memCount; // return number of bytes successfully written | |
| 555 } | |
| 556 | |
| 557 //----------------------------------------------------------------------------- | |
| 558 // Target extras?! | |
| 559 int | |
| 560 __process_target_query(char * pkt, char * out, int maxOut) | |
| 561 { return 0 ; } | |
| 562 int | |
| 563 __process_target_set(char * pkt, char * out, int maxout) | |
| 564 { return 0 ; } | |
| 565 int | |
| 566 __process_target_packet(char * pkt, char * out, int maxout) | |
| 567 { return 0 ; } | |
| 568 | |
| 569 // GDB string output, making sure interrupts are disabled. | |
| 570 // This function gets used by some diag output functions. | |
| 571 void | |
| 572 hal_output_gdb_string(target_register_t str, int string_len) | |
| 573 { | |
| 574 unsigned long __state; | |
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575 HAL_DISABLE_INTERRUPTS(__state); |
| 2 | 576 __output_gdb_string(str, string_len); |
| 577 HAL_RESTORE_INTERRUPTS(__state); | |
| 578 } | |
| 579 | |
| 580 #endif // CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS |