Mercurial > ecos
annotate packages/hal/common/current/src/generic-stub.c @ 130:eb9fd8c04db3 ecos-sw-2000-10-23
Merge from eCos master repository on 2000-10-23-17:01:37-BST
| author | jlarmour |
|---|---|
| date | Mon, 23 Oct 2000 17:10:57 +0000 |
| parents | 6bd9d475ed4b |
| children | 0ae0bc38e387 |
| rev | line source |
|---|---|
| 2 | 1 #include "board.h" |
| 2 | |
| 3 #ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS | |
| 4 | |
| 5 /* Eventually, this should default to ON */ | |
| 6 #if USE_GDBSTUB_PROTOTYPES | |
| 7 #include "stub-tservice.h" | |
| 8 #include "generic-stub.h" | |
| 9 #else | |
| 10 // Function declarations (prevents compiler warnings) | |
| 11 int stubhex (unsigned char ch); | |
| 12 static void getpacket (char *buffer); | |
| 13 static void unlock_thread_scheduler (void); | |
| 14 static uint32 crc32 (unsigned char *ptr, int len, uint32 crc); | |
| 15 #endif | |
| 16 | |
| 17 #include "thread-pkts.h" | |
| 18 /* Defines function macros if thread support is not selected in board.h */ | |
| 19 | |
| 20 | |
| 0 | 21 /**************************************************************************** |
| 22 | |
| 2 | 23 THIS SOFTWARE IS NOT COPYRIGHTED |
| 0 | 24 |
| 25 HP offers the following for use in the public domain. HP makes no | |
| 26 warranty with regard to the software or it's performance and the | |
| 27 user accepts the software "AS IS" with all faults. | |
| 28 | |
| 29 HP DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WITH REGARD | |
| 30 TO THIS SOFTWARE INCLUDING BUT NOT LIMITED TO THE WARRANTIES | |
| 31 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
| 32 | |
| 33 ****************************************************************************/ | |
| 34 | |
| 35 /**************************************************************************** | |
| 36 * Header: remcom.c,v 1.34 91/03/09 12:29:49 glenne Exp $ | |
| 37 * | |
| 38 * Module name: remcom.c $ | |
| 39 * Revision: 1.34 $ | |
| 40 * Date: 91/03/09 12:29:49 $ | |
| 41 * Contributor: Lake Stevens Instrument Division$ | |
| 42 * | |
| 43 * Description: low level support for gdb debugger. $ | |
| 44 * | |
| 45 * Considerations: only works on target hardware $ | |
| 46 * | |
| 47 * Written by: Glenn Engel $ | |
| 48 * ModuleState: Experimental $ | |
| 49 * | |
| 50 * NOTES: See Below $ | |
| 51 * | |
|
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52 * Modified for SPARC by Stu Grossman, Red Hat. |
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53 * Modified for generic CygMON stub support by Bob Manson, Red Hat. |
| 0 | 54 * |
| 55 * To enable debugger support, two things need to happen. One, a | |
| 2 | 56 * call to set_debug_traps () is necessary in order to allow any breakpoints |
| 0 | 57 * or error conditions to be properly intercepted and reported to gdb. |
| 58 * Two, a breakpoint needs to be generated to begin communication. This | |
| 2 | 59 * is most easily accomplished by a call to breakpoint (). Breakpoint () |
| 0 | 60 * simulates a breakpoint by executing a trap #1. |
| 61 * | |
| 62 ************* | |
| 63 * | |
| 64 * The following gdb commands are supported: | |
| 65 * | |
| 66 * command function Return value | |
| 67 * | |
| 68 * g return the value of the CPU registers hex data or ENN | |
| 69 * G set the value of the CPU registers OK or ENN | |
| 70 * | |
| 71 * mAA..AA,LLLL Read LLLL bytes at address AA..AA hex data or ENN | |
| 72 * MAA..AA,LLLL: Write LLLL bytes at address AA.AA OK or ENN | |
| 73 * | |
| 74 * c Resume at current address SNN ( signal NN) | |
| 75 * cAA..AA Continue at address AA..AA SNN | |
| 76 * | |
| 77 * s Step one instruction SNN | |
| 78 * sAA..AA Step one instruction from AA..AA SNN | |
| 79 * | |
| 80 * k kill | |
| 81 * | |
| 82 * ? What was the last sigval ? SNN (signal NN) | |
| 83 * | |
| 2 | 84 * bBB..BB Set baud rate to BB..BB OK or BNN, then sets |
| 85 * baud rate | |
| 0 | 86 * |
| 87 * All commands and responses are sent with a packet which includes a | |
| 88 * checksum. A packet consists of | |
| 89 * | |
| 90 * $<packet info>#<checksum>. | |
| 91 * | |
| 92 * where | |
| 93 * <packet info> :: <characters representing the command or response> | |
| 94 * <checksum> :: < two hex digits computed as modulo 256 sum of <packetinfo>> | |
| 95 * | |
| 96 * When a packet is received, it is first acknowledged with either '+' or '-'. | |
| 97 * '+' indicates a successful transfer. '-' indicates a failed transfer. | |
| 98 * | |
| 99 * Example: | |
| 100 * | |
| 101 * Host: Reply: | |
| 102 * $m0,10#2a +$00010203040506070809101112131415#42 | |
| 103 * | |
| 104 ****************************************************************************/ | |
| 105 | |
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106 #ifdef __ECOS__ |
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107 |
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108 // We cannot share memcpy and memset with the rest of the system since |
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109 // the user may want to step through it. |
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110 static inline void* |
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111 memcpy(void* dest, void* src, int size) |
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112 { |
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113 unsigned char* __d = (unsigned char*) dest; |
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114 unsigned char* __s = (unsigned char*) src; |
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115 |
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116 while(size--) |
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117 *__d++ = *__s++; |
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118 |
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119 return dest; |
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120 } |
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121 |
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122 static inline void* |
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123 memset(void* s, int c, int size) |
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124 { |
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125 unsigned char* __s = (unsigned char*) s; |
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126 unsigned char __c = (unsigned char) c; |
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127 |
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128 while(size--) |
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129 *__s++ = __c; |
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130 |
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131 return s; |
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132 } |
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133 |
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134 #else |
| 2 | 135 #include <string.h> |
| 136 #include <signal.h> | |
| 137 #endif // __ECOS__ | |
| 0 | 138 |
| 139 /************************************************************************/ | |
| 140 /* BUFMAX defines the maximum number of characters in inbound/outbound buffers*/ | |
| 141 /* at least NUMREGBYTES*2 are needed for register packets */ | |
| 142 #define BUFMAX 2048 | |
| 143 | |
| 2 | 144 static int initialized = 0; /* !0 means we've been initialized */ |
| 145 | |
| 0 | 146 static int process_exception (int sigval); |
| 147 static void do_nothing (void); /* and do it gracefully */ | |
| 148 static int syscall_do_nothing (int); | |
| 2 | 149 |
| 150 void __free_program_args (void); | |
| 0 | 151 |
| 152 volatile __PFI __process_exception_vec = process_exception; | |
| 153 volatile __PFV __process_exit_vec = do_nothing; | |
| 154 volatile __PFI __process_syscall_vec = syscall_do_nothing; | |
| 155 volatile __PFI __process_signal_vec = NULL; | |
| 2 | 156 volatile __PFV __init_vec = NULL; |
| 157 volatile __PFV __cleanup_vec = NULL; | |
| 158 | |
| 159 static char *__add_program_arg (int argnum, uint32 arglen); | |
| 0 | 160 |
| 161 static const char hexchars[] = "0123456789abcdef"; | |
| 162 | |
| 2 | 163 static void process_query (char *pkt); |
| 164 static void process_set (char *pkt); | |
| 0 | 165 |
| 166 char | |
| 167 __tohex (int c) | |
| 168 { | |
| 169 return hexchars [c & 15]; | |
| 170 } | |
| 171 | |
| 2 | 172 #define __tohex(c) hexchars[(c) & 15] |
| 0 | 173 |
| 174 #ifndef NUMREGS_GDB | |
| 175 #define NUMREGS_GDB NUMREGS | |
| 176 #endif | |
| 177 | |
| 178 /* One pushback character. */ | |
| 179 int ungot_char = -1; | |
| 180 | |
| 181 static int | |
| 182 readDebugChar (void) | |
| 183 { | |
| 184 if (ungot_char > 0) | |
| 185 { | |
| 186 int result = ungot_char; | |
| 187 ungot_char = -1; | |
| 188 return result; | |
| 189 } | |
| 190 else | |
| 191 return getDebugChar (); | |
| 192 } | |
| 193 | |
| 194 /* Convert ch from a hex digit to an int. */ | |
| 195 | |
| 196 int | |
| 2 | 197 stubhex (ch) |
| 198 unsigned char ch; | |
| 0 | 199 { |
| 200 if (ch >= 'a' && ch <= 'f') | |
| 201 return ch-'a'+10; | |
| 202 if (ch >= '0' && ch <= '9') | |
| 203 return ch-'0'; | |
| 204 if (ch >= 'A' && ch <= 'F') | |
| 205 return ch-'A'+10; | |
| 206 return -1; | |
| 207 } | |
| 208 | |
| 209 static void | |
| 2 | 210 getpacket (buffer) |
| 211 char *buffer; | |
| 0 | 212 { |
| 213 struct gdb_packet packet; | |
| 214 | |
| 215 packet.state = 0; | |
| 216 packet.contents = buffer; | |
| 2 | 217 while (__add_char_to_packet (readDebugChar () & 0xff, &packet) != 1) |
| 0 | 218 { |
| 219 /* Empty */ | |
| 220 } | |
| 221 } | |
| 222 | |
| 223 int | |
| 2 | 224 __add_char_to_packet (ch, packet) |
| 225 unsigned int ch; | |
| 226 struct gdb_packet *packet; | |
| 0 | 227 { |
| 228 if (packet->state == 0) | |
| 229 { | |
| 230 if (ch == '$') | |
| 2 | 231 { |
| 232 packet->state = 1; | |
| 233 packet->length = 0; | |
| 234 packet->checksum = 0; | |
| 235 packet->xmitcsum = -1; | |
| 236 } | |
| 0 | 237 return 0; |
| 238 } | |
| 239 | |
| 240 if (packet->state == 1) | |
| 241 { | |
| 242 if (ch == '#') | |
| 2 | 243 { |
| 244 packet->contents[packet->length] = 0; | |
| 245 packet->state = 2; | |
| 246 } | |
| 0 | 247 else |
| 2 | 248 { |
| 249 if (packet->length == BUFMAX) { | |
| 250 packet->state = 0; | |
| 251 return -1; | |
| 252 } | |
| 253 packet->checksum += ch; | |
| 254 packet->contents[packet->length++] = ch; | |
| 255 } | |
| 0 | 256 return 0; |
| 257 } | |
| 258 | |
| 259 if (packet->state == 2) | |
| 260 { | |
| 261 packet->xmitcsum = stubhex (ch) << 4; | |
| 262 packet->state = 3; | |
| 263 return 0; | |
| 264 } | |
| 265 | |
| 266 if (packet->state == 3) | |
| 267 { | |
| 2 | 268 packet->xmitcsum |= stubhex (ch); |
| 0 | 269 if ((packet->checksum & 255) != packet->xmitcsum) |
| 2 | 270 { |
| 271 putDebugChar ('-'); /* failed checksum */ | |
| 272 packet->state = 0; | |
| 273 return -1; | |
| 274 } | |
| 0 | 275 else |
| 2 | 276 { |
| 277 putDebugChar ('+'); /* successful transfer */ | |
| 278 /* if a sequence char is present, reply the sequence ID */ | |
| 279 if (packet->contents[2] == ':') | |
| 280 { | |
| 281 uint32 count = packet->length; | |
| 282 uint32 i; | |
| 283 putDebugChar (packet->contents[0]); | |
| 284 putDebugChar (packet->contents[1]); | |
| 285 /* remove sequence chars from buffer */ | |
| 286 for (i=3; i <= count; i++) | |
| 287 packet->contents[i-3] = packet->contents[i]; | |
| 288 } | |
| 289 return 1; | |
| 290 } | |
| 0 | 291 } |
| 292 /* We should never get here. */ | |
| 293 packet->state = 0; | |
| 294 return -1; | |
| 295 } | |
| 296 | |
| 297 /* send the packet in buffer. */ | |
| 298 | |
| 2 | 299 void |
| 300 __putpacket (buffer) | |
| 301 char *buffer; | |
| 0 | 302 { |
| 303 unsigned char checksum; | |
| 2 | 304 uint32 count; |
| 0 | 305 unsigned char ch; |
| 306 | |
| 307 /* $<packet info>#<checksum>. */ | |
| 308 do | |
| 309 { | |
| 310 putDebugChar ('$'); | |
| 311 checksum = 0; | |
| 312 count = 0; | |
| 313 | |
| 314 while ((ch = buffer[count])) | |
| 2 | 315 { |
| 316 putDebugChar (ch); | |
| 317 checksum += ch; | |
| 318 count += 1; | |
| 319 } | |
| 0 | 320 |
| 321 putDebugChar ('#'); | |
| 322 putDebugChar (hexchars[(checksum >> 4) & 0xf]); | |
| 323 putDebugChar (hexchars[checksum & 0xf]); | |
| 324 | |
| 325 } | |
| 326 while ((readDebugChar () & 0x7f) != '+'); | |
| 327 } | |
| 328 | |
| 329 static char remcomInBuffer[BUFMAX]; | |
| 330 static char remcomOutBuffer[BUFMAX]; | |
| 331 | |
| 332 /* Indicate to caller of mem2hex or hex2mem that there has been an | |
| 333 error. */ | |
| 334 volatile int __mem_fault = 0; | |
| 335 | |
| 2 | 336 |
| 337 #ifndef TARGET_HAS_OWN_MEM_FUNCS | |
| 338 /* | |
| 339 * _target_readmem_hook / _target_writemem_hook: | |
| 340 * Allow target to get involved in reading/writing memory. | |
| 341 * | |
| 342 * If these hooks are defined by the target, they will be | |
| 343 * called for each user program memory access. Otherwise, the stub | |
| 344 * will simply dereference a pointer to access user program memory. | |
| 345 */ | |
| 346 | |
| 347 unsigned char (*_target_readmem_hook) (unsigned char* addr); | |
| 348 void (*_target_writemem_hook) (unsigned char* addr, | |
| 349 unsigned char value); | |
| 350 | |
| 351 static unsigned char | |
| 352 get_target_byte (volatile unsigned char *address) | |
| 0 | 353 { |
| 2 | 354 if (_target_readmem_hook) /* target needs to control memory access */ |
| 355 return _target_readmem_hook ((unsigned char *) address); | |
| 356 else | |
| 357 return *address; | |
| 358 } | |
| 359 | |
| 360 static void | |
| 361 put_target_byte (volatile unsigned char *address, unsigned char value) | |
| 362 { | |
| 363 if (_target_writemem_hook) /* target needs to control memory access */ | |
| 364 _target_writemem_hook ((unsigned char *) address, value); | |
| 365 else | |
| 366 *address = value; | |
| 367 } | |
| 368 | |
| 369 /* These are the "arguments" to __do_read_mem and __do_write_mem, | |
| 370 which are passed as globals to avoid squeezing them thru | |
| 371 __set_mem_fault_trap. */ | |
| 372 | |
| 373 static volatile target_register_t memCount; | |
| 374 static volatile unsigned char *memSrc, *memDst; | |
| 0 | 375 |
| 2 | 376 /* |
| 377 * __do_read_mem: | |
| 378 * Copy from target memory to trusted memory. | |
| 379 */ | |
| 380 | |
| 381 static void | |
| 382 __do_read_mem (void) | |
| 383 { | |
| 384 __mem_fault = 0; | |
| 385 while (memCount) | |
| 386 { | |
| 387 unsigned char ch = get_target_byte (memSrc++); | |
| 388 | |
| 389 if (__mem_fault) | |
| 390 return; | |
| 391 *memDst++ = ch; | |
| 392 memCount--; | |
| 393 } | |
| 0 | 394 } |
| 395 | |
| 2 | 396 /* |
| 397 * __do_write_mem: | |
| 398 * Copy from trusted memory to target memory. | |
| 399 */ | |
| 400 | |
| 401 static void | |
| 402 __do_write_mem (void) | |
| 403 { | |
| 404 __mem_fault = 0; | |
| 405 while (memCount) | |
| 406 { | |
| 407 unsigned char ch = *memSrc++; | |
| 408 | |
| 409 put_target_byte (memDst++, ch); | |
| 410 if (__mem_fault) | |
| 411 return; | |
| 412 memCount--; | |
| 413 } | |
| 414 } | |
| 415 | |
| 416 /* | |
| 417 * __read_mem_safe: | |
| 418 * Get contents of target memory, abort on error. | |
| 419 */ | |
| 420 | |
| 0 | 421 int |
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422 __read_mem_safe (void *dst, target_register_t src, int count) |
| 0 | 423 { |
| 2 | 424 memCount = count; |
| 425 memSrc = (unsigned char *) src; | |
| 426 memDst = (unsigned char *) dst; | |
| 427 __set_mem_fault_trap (__do_read_mem); | |
| 428 return count - memCount; /* return number of bytes successfully read */ | |
| 0 | 429 } |
| 430 | |
| 2 | 431 /* |
| 432 * __write_mem_safe: | |
| 433 * Set contents of target memory, abort on error. | |
| 434 */ | |
| 435 | |
| 0 | 436 int |
| 437 __write_mem_safe (unsigned char *src, target_register_t dst, int count) | |
| 438 { | |
| 2 | 439 memCount = count; |
| 440 memSrc = (unsigned char *) src; | |
| 441 memDst = (unsigned char *) dst; | |
| 442 __set_mem_fault_trap (__do_write_mem); | |
| 443 return count - memCount; /* return number of bytes successfully read */ | |
| 0 | 444 } |
| 445 | |
| 2 | 446 #endif /* TARGET_HAS_OWN_MEM_FUNCS */ |
| 447 | |
| 448 /* These are the "arguments" to __mem2hex_helper and __hex2mem_helper, | |
| 449 which are passed as globals to avoid squeezing them thru | |
| 450 __set_mem_fault_trap. */ | |
| 451 | |
| 452 static int hexMemCount; | |
| 453 static char *hexMemSrc, *hexMemDst; | |
| 454 static int may_fault_mode; | |
| 455 | |
| 456 /* Hamburger helper? */ | |
| 457 static void | |
| 458 __mem2hex_helper (void) | |
| 459 { | |
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460 union { |
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461 unsigned long long_val; |
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462 unsigned char bytes[sizeof(long)]; |
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463 } val; |
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464 int len, i; |
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465 unsigned char ch; |
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466 __mem_fault = 0; |
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467 while (hexMemCount > 0) { |
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468 if (may_fault_mode) { |
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469 if ((hexMemCount >= sizeof(long)) && |
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470 (((target_register_t)hexMemSrc & (sizeof(long)-1)) == 0)) { |
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471 // Should be safe to access via a long |
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472 len = sizeof(long); |
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473 } else if ((hexMemCount >= sizeof(short)) && |
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474 (((target_register_t)hexMemSrc & (sizeof(short)-1)) == 0)) { |
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475 // Should be safe to access via a short |
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476 len = sizeof(short); |
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477 } else { |
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478 len = 1; |
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479 } |
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480 __read_mem_safe(&val.bytes[0], hexMemSrc, len); |
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481 } else { |
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482 len = 1; |
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483 val.bytes[0] = *hexMemSrc; |
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484 } |
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485 if (__mem_fault) |
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486 return; |
| 2 | 487 |
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488 for (i = 0; i < len; i++) { |
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489 ch = val.bytes[i]; |
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490 *(hexMemDst++) = hexchars[(ch >> 4) & 0xf]; |
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491 if (__mem_fault) |
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492 return; |
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493 *(hexMemDst++) = hexchars[ch & 0xf]; |
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494 if (__mem_fault) |
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495 return; |
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496 } |
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497 hexMemCount -= len; |
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498 hexMemSrc += len; |
| 2 | 499 } |
| 500 } | |
| 501 | |
| 502 /* Convert the memory pointed to by MEM into HEX, placing result in BUF. | |
| 503 * Return a pointer to the last char put in buf (NUL). In case of a memory | |
| 504 * fault, return 0. | |
| 0 | 505 * If MAY_FAULT is non-zero, then we will handle memory faults by returning |
| 2 | 506 * a 0 (and assume that MEM is a pointer into the user program), else we |
| 507 * treat a fault like any other fault in the stub (and assume that MEM is | |
| 508 * a pointer into the stub's memory). | |
| 0 | 509 */ |
| 510 | |
| 2 | 511 char * |
| 512 __mem2hex (mem, buf, count, may_fault) | |
| 513 char *mem; | |
| 514 char *buf; | |
| 0 | 515 int count; |
| 516 int may_fault; | |
| 517 { | |
| 2 | 518 hexMemDst = (unsigned char *) buf; |
| 519 hexMemSrc = (unsigned char *) mem; | |
| 520 hexMemCount = count; | |
| 521 may_fault_mode = may_fault; | |
| 522 | |
| 523 if (may_fault) | |
| 0 | 524 { |
| 2 | 525 if (__set_mem_fault_trap (__mem2hex_helper)) |
| 526 return 0; | |
| 0 | 527 } |
| 2 | 528 else |
| 529 __mem2hex_helper (); | |
| 0 | 530 |
| 2 | 531 *hexMemDst = 0; |
| 0 | 532 |
| 2 | 533 return (char *) hexMemDst; |
| 0 | 534 } |
| 535 | |
| 2 | 536 static void |
| 537 __hex2mem_helper (void) | |
| 0 | 538 { |
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539 union { |
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540 unsigned long long_val; |
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541 unsigned char bytes[sizeof(long)]; |
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542 } val; |
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543 int len, i; |
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544 unsigned char ch = '\0'; |
| 0 | 545 |
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546 __mem_fault = 0; |
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547 while (hexMemCount > 0 && *hexMemSrc) { |
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548 if (may_fault_mode) { |
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549 if ((hexMemCount >= sizeof(long)) && |
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550 (((target_register_t)hexMemDst & (sizeof(long)-1)) == 0)) { |
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551 len = sizeof(long); |
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552 } else if ((hexMemCount >= sizeof(short)) && |
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553 (((target_register_t)hexMemDst & (sizeof(short)-1)) == 0)) { |
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554 len = sizeof(short); |
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555 } else { |
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556 len = 1; |
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557 } |
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558 } else { |
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559 len = 1; |
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560 } |
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561 |
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562 for (i = 0; i < len; i++) { |
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563 // Check for short data? |
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564 ch = stubhex (*(hexMemSrc++)) << 4; |
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565 if (__mem_fault) |
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566 return; |
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567 ch |= stubhex (*(hexMemSrc++)); |
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568 if (__mem_fault) |
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569 return; |
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570 val.bytes[i] = ch; |
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571 } |
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572 |
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573 if (may_fault_mode) |
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574 __write_mem_safe (&val.bytes[0], hexMemDst, len); |
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575 else |
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576 *hexMemDst = ch; |
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577 |
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578 if (__mem_fault) |
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579 return; |
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580 hexMemCount -= len; |
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581 hexMemDst += len; |
| 0 | 582 } |
| 2 | 583 } |
| 584 | |
| 585 /* Convert COUNT bytes of the hex array pointed to by BUF into binary | |
| 586 to be placed in MEM. Return a pointer to the character AFTER the | |
| 587 last byte written. | |
| 588 | |
| 589 If MAY_FAULT is set, we will return a non-zero value if a memory | |
| 590 fault occurs (and we assume that MEM is a pointer into the user | |
| 591 program). Otherwise, we will take a trap just like any other memory | |
| 592 fault (and assume that MEM points into the stub's memory). */ | |
| 0 | 593 |
| 2 | 594 char * |
| 595 __hex2mem (buf, mem, count, may_fault) | |
| 596 char *buf; | |
| 597 char *mem; | |
| 598 int count; | |
| 599 int may_fault; | |
| 600 { | |
| 601 hexMemSrc = (unsigned char *) buf; | |
| 602 hexMemDst = (unsigned char *) mem; | |
| 603 hexMemCount = count; | |
| 604 may_fault_mode = may_fault; | |
| 0 | 605 |
| 2 | 606 if (may_fault) |
| 607 { | |
| 608 if (__set_mem_fault_trap (__hex2mem_helper)) | |
| 609 return 0; | |
| 610 } | |
| 611 else | |
| 612 __hex2mem_helper (); | |
| 613 | |
| 614 return (char *) hexMemDst; | |
| 615 } | |
| 616 | |
| 617 void | |
| 618 set_debug_traps (void) | |
| 619 { | |
| 620 __install_traps (); | |
| 621 initialized = 1; /* FIXME: Change this to dbg_stub_initialized */ | |
| 0 | 622 } |
| 623 | |
| 624 /* | |
| 625 * While we find nice hex chars, build an int. | |
| 626 * Return number of chars processed. | |
| 627 */ | |
| 628 | |
| 2 | 629 unsigned int |
| 630 __hexToInt (char **ptr, target_register_t *intValue) | |
| 0 | 631 { |
| 632 int numChars = 0; | |
| 633 int hexValue; | |
| 634 | |
| 635 *intValue = 0; | |
| 636 | |
| 637 while (**ptr) | |
| 638 { | |
| 2 | 639 hexValue = stubhex (**ptr); |
| 0 | 640 if (hexValue < 0) |
| 2 | 641 break; |
| 0 | 642 |
| 643 *intValue = (*intValue << 4) | hexValue; | |
| 644 numChars ++; | |
| 645 | |
| 646 (*ptr)++; | |
| 647 } | |
| 648 | |
| 649 return (numChars); | |
| 650 } | |
| 651 | |
| 652 /* | |
| 653 * Complement of __hexToInt: take an int of size "numBits", | |
| 654 * convert it to a hex string. Return length of (unterminated) output. | |
| 655 */ | |
| 656 | |
| 657 unsigned int | |
| 658 __intToHex (char *ptr, target_register_t intValue, int numBits) | |
| 659 { | |
| 660 int numChars = 0; | |
| 661 | |
| 662 if (intValue == 0) | |
| 663 { | |
| 664 *(ptr++) = '0'; | |
| 665 *(ptr++) = '0'; | |
| 666 return 2; | |
| 667 } | |
| 668 | |
| 669 numBits = (numBits + 7) / 8; | |
| 670 while (numBits) | |
| 671 { | |
| 672 int v = (intValue >> ((numBits - 1) * 8)); | |
| 673 if (v || (numBits == 1)) | |
| 2 | 674 { |
| 675 v = v & 255; | |
| 676 *(ptr++) = __tohex ((v / 16) & 15); | |
| 677 *(ptr++) = __tohex (v & 15); | |
| 678 numChars += 2; | |
| 679 } | |
| 0 | 680 numBits--; |
| 681 } | |
| 682 | |
| 683 return (numChars); | |
| 684 } | |
| 685 | |
| 2 | 686 #if DEBUG_THREADS |
| 687 /* | |
| 688 * Kernel Thread Control | |
| 689 * | |
| 690 * If the current thread is set to other than zero (or minus one), | |
| 691 * then ask the kernel to lock it's scheduler so that only that thread | |
| 692 * can run. | |
| 693 */ | |
| 694 | |
| 695 static unsigned char did_lock_scheduler = 0; | |
| 696 static unsigned char did_disable_interrupts = 0; | |
| 697 | |
| 698 /* Pointer to "kernel call" for scheduler control */ | |
| 699 static int (*schedlock_fn) (int, int, long) = stub_lock_scheduler; | |
| 700 | |
| 701 /* Pointer to target stub call for disabling interrupts. | |
| 702 Target stub will initialize this if it can. */ | |
| 703 int (*__disable_interrupts_hook) (int); /* don't initialize here! */ | |
| 704 #endif | |
| 705 | |
| 706 static void | |
| 707 lock_thread_scheduler (int kind) /* "step" or "continue" */ | |
| 708 { | |
| 709 #if DEBUG_THREADS | |
| 710 int ret = 0; | |
| 711 | |
| 712 /* GDB will signal its desire to run a single thread | |
| 713 by setting _gdb_cont_thread to non-zero / non-negative. */ | |
| 714 if (_gdb_cont_thread <= 0) | |
| 715 return; | |
| 716 | |
| 717 if (schedlock_fn) /* kernel call */ | |
| 718 ret = (*schedlock_fn) (1, kind, _gdb_cont_thread); | |
| 719 | |
| 720 if (ret == 1) | |
| 721 { | |
| 722 did_lock_scheduler = 1; | |
| 723 return; | |
| 724 } | |
| 725 | |
| 726 if (schedlock_fn == 0 || /* no kernel scheduler call */ | |
| 727 ret == -1) /* kernel asks stub to handle it */ | |
| 728 if (__disable_interrupts_hook) /* target stub has capability */ | |
| 729 if ((*__disable_interrupts_hook) (1)) | |
| 730 { | |
| 731 did_disable_interrupts = 1; | |
| 732 return; | |
| 733 } | |
| 734 #endif /* DEBUG_THREADS */ | |
| 735 } | |
| 736 | |
| 737 static void | |
| 738 unlock_thread_scheduler () | |
| 739 { | |
| 740 #if DEBUG_THREADS | |
| 741 if (did_lock_scheduler) | |
| 742 if (schedlock_fn) /* kernel call */ | |
| 743 { | |
| 744 (*schedlock_fn) (0, 0, _gdb_cont_thread); | |
| 745 /* I could check the return value, but | |
| 746 what would I do if it failed??? */ | |
| 747 did_lock_scheduler = 0; | |
| 748 } | |
| 749 if (did_disable_interrupts) | |
| 750 if (__disable_interrupts_hook) /* target stub call */ | |
| 751 { | |
| 752 (*__disable_interrupts_hook) (0); | |
| 753 /* Again, I could check the return value, but | |
| 754 what would I do if it failed??? */ | |
| 755 did_disable_interrupts = 0; | |
| 756 } | |
| 757 #endif /* DEBUG_THREADS */ | |
| 758 } | |
| 759 | |
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760 #ifdef CYGPKG_CYGMON |
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761 int processing_breakpoint_function = 0; |
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762 #endif |
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763 |
| 0 | 764 void |
| 765 __handle_exception (void) | |
| 766 { | |
| 767 int sigval; | |
| 768 | |
| 2 | 769 #ifdef TARGET_HAS_NEXT_STEP |
| 770 if (! __next_step_done ()) | |
| 771 { | |
| 772 __clear_breakpoints (); | |
| 773 __install_breakpoints (); | |
| 774 __single_step (); | |
| 775 return; | |
| 776 } | |
| 777 #endif | |
| 0 | 778 |
| 2 | 779 #ifdef __ECOS__ |
| 780 // We need to unpack the registers before they are accessed. | |
| 781 if (__cleanup_vec != NULL) | |
| 782 __cleanup_vec (); | |
| 0 | 783 |
| 2 | 784 #ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT |
| 785 // Special case for GDB BREAKs. This flag is set by cyg_stub_cleanup. | |
| 786 if (cyg_hal_gdb_break) { | |
| 787 cyg_hal_gdb_break = 0; | |
| 788 sigval = SIGINT; | |
| 789 } else | |
| 790 #endif | |
| 791 sigval = __computeSignal (__get_trap_number ()); | |
| 792 #else // __ECOS__ | |
| 0 | 793 /* reply to host that an exception has occurred */ |
| 794 sigval = __computeSignal (__get_trap_number ()); | |
| 2 | 795 #endif // __ECOS__ |
| 0 | 796 |
| 797 if (__is_breakpoint_function ()) | |
|
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798 { |
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799 #ifdef CYGPKG_CYGMON |
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800 processing_breakpoint_function = 1; |
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801 #endif |
| 0 | 802 __skipinst (); |
|
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803 } else { |
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804 #ifdef CYGPKG_CYGMON |
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805 processing_breakpoint_function = 0; |
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806 #endif |
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807 } |
| 0 | 808 |
| 2 | 809 #ifndef __ECOS__ |
| 810 if (__cleanup_vec != NULL) | |
| 811 __cleanup_vec (); | |
| 812 #endif // !__ECOS__ | |
| 813 | |
| 814 __clear_breakpoints (); | |
| 815 | |
| 816 /* Undo effect of previous single step. */ | |
| 817 unlock_thread_scheduler (); | |
| 818 __clear_single_step (); | |
| 819 | |
|
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820 #ifdef __ECOS__ |
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821 /* Need to flush the data and instruction cache here, as we may have |
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822 removed a breakpoint in __single_step - and we may be sharing |
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823 some code with the application! */ |
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824 |
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825 __data_cache (CACHE_FLUSH) ; |
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826 __instruction_cache (CACHE_FLUSH) ; |
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827 #endif |
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828 |
| 2 | 829 #ifdef SIGSYSCALL |
| 830 if (sigval == SIGSYSCALL) | |
| 0 | 831 { |
| 832 int val; | |
| 833 /* Do the skipinst FIRST. */ | |
| 2 | 834 #ifndef SYSCALL_PC_AFTER_INST |
| 0 | 835 __skipinst (); |
| 2 | 836 #endif |
| 0 | 837 val = __process_syscall_vec (__get_syscall_num ()); |
| 2 | 838 if (val < 0) |
| 839 sigval = -val; | |
| 840 else | |
| 841 sigval = 0; | |
| 0 | 842 } |
| 843 | |
| 844 #endif | |
| 845 | |
| 2 | 846 /* Indirect function call to stub, cygmon monitor or other */ |
| 847 if (sigval != 0) | |
| 848 { | |
| 849 while (__process_exception_vec (sigval)) | |
| 850 { | |
| 851 /* Empty! */ | |
| 852 } | |
| 853 } | |
| 0 | 854 |
| 2 | 855 __install_breakpoints (); |
| 0 | 856 |
| 2 | 857 if (__init_vec != NULL) |
| 858 __init_vec (); | |
| 0 | 859 } |
| 860 | |
| 2 | 861 /* |
| 862 * _get_trace_register_hook: | |
| 863 * This function pointer will be non-zero if the trace component | |
| 864 * wants to intercept requests for register values. | |
| 865 * | |
| 866 * FIXME: evidently I need a new hook for large registers... | |
| 867 */ | |
| 868 | |
| 869 int (*_get_trace_register_hook) (regnames_t, target_register_t *); | |
| 870 | |
|
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871 void |
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872 stub_format_registers(char *ptr) |
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873 { |
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874 int regnum; |
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875 |
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876 for (regnum = 0; regnum < NUMREGS_GDB; regnum++) { |
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877 /* We need to compensate for the value offset within the |
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878 register. */ |
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879 char dummyDat[32]; |
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880 target_register_t addr; |
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881 char *vptr; |
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882 int reg_valid = 1; |
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883 |
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884 #ifdef TARGET_HAS_LARGE_REGISTERS |
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885 if (sizeof (target_register_t) < REGSIZE (regnum)) { |
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886 get_register_as_bytes (regnum, dummyDat); |
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887 vptr = dummyDat; |
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888 } else |
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889 #endif |
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890 { |
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891 if (_get_trace_register_hook) |
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892 reg_valid = _get_trace_register_hook (regnum, &addr); |
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893 else |
|
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894 { |
|
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895 addr = get_register (regnum); |
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896 #ifdef CYGHWR_REGISTER_VALIDITY_CHECKING |
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897 reg_valid = get_register_valid (regnum); |
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898 #endif |
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899 } |
|
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900 vptr = ((char *) &addr); |
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901 if (sizeof (addr) > REGSIZE(regnum)) { |
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902 /* May need to cope with endian-ness */ |
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903 |
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904 #if !defined(__LITTLE_ENDIAN__) && !defined(_LITTLE_ENDIAN) |
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905 vptr += sizeof (addr) - REGSIZE (regnum); |
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906 #endif |
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907 } else if (sizeof (addr) < REGSIZE (regnum)) { |
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908 int off = REGSIZE (regnum) - sizeof (addr); |
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909 int x; |
|
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910 char extend_val = 0; |
|
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911 |
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912 #ifdef CYGARC_SIGN_EXTEND_REGISTERS |
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913 { |
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914 unsigned long bits_in_addr = (sizeof(addr) << 3); // ie Size in bytes * 8 |
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915 target_register_t sign_bit_mask = (1 << (bits_in_addr - 1)); |
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916 if ((addr & sign_bit_mask) == sign_bit_mask) |
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917 extend_val = ~0; |
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918 } |
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919 #endif |
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920 |
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921 #if defined(__LITTLE_ENDIAN__) || defined(_LITTLE_ENDIAN) |
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922 for (x = 0; x < off; x++) |
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923 dummyDat[x + sizeof(addr)] = extend_val; |
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924 memcpy (dummyDat, &addr, sizeof (addr)); |
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925 #else |
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926 for (x = 0; x < off; x++) |
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927 dummyDat[x] = extend_val; |
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928 memcpy (dummyDat + off, &addr, sizeof (addr)); |
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929 #endif |
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930 vptr = dummyDat; |
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931 } |
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932 } |
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933 if (reg_valid) { /* we have a valid reg value */ |
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934 ptr = __mem2hex (vptr, ptr, REGSIZE (regnum), 0); |
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935 } else { |
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936 /* Trace component returned a failure code. |
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937 This means that the register value is not available. |
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938 We'll fill it with 'x's, and GDB will understand. */ |
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939 memset (ptr, 'x', 2 * REGSIZE (regnum)); |
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940 ptr += 2 * REGSIZE (regnum); |
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941 } |
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942 } |
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943 } |
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944 |
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945 void |
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946 stub_update_registers(char *in_ptr, char *out_ptr) |
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947 { |
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948 char *ptr = &in_ptr[1]; |
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949 int x; |
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950 int sr = 0, er = NUMREGS_GDB; |
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951 |
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952 if (*in_ptr == 'P') { |
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953 target_register_t regno; |
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954 |
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955 if (__hexToInt (&ptr, ®no) && (*ptr++ == '=')) { |
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956 |
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957 sr = regno; |
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958 er = regno + 1; |
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959 } else { |
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960 strcpy (out_ptr, "P01"); |
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961 return; |
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962 } |
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963 } |
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964 |
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965 for (x = sr; x < er; x++) { |
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966 target_register_t value = 0; |
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967 char *vptr; |
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968 |
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969 #ifdef TARGET_HAS_LARGE_REGISTERS |
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970 if (sizeof (target_register_t) < REGSIZE (x)) { |
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971 char dummyDat [32]; |
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972 |
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973 __hex2mem (ptr, dummyDat, REGSIZE (x), 0); |
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974 put_register_as_bytes (x, dummyDat); |
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975 } else |
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976 #endif |
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977 { |
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978 vptr = ((char *) &value); |
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979 #if !defined(__LITTLE_ENDIAN__) && !defined(_LITTLE_ENDIAN) |
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980 vptr += sizeof (value) - REGSIZE (x); |
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981 #endif |
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982 __hex2mem (ptr, vptr, REGSIZE (x), 0); |
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983 put_register (x, value); |
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984 } |
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985 ptr += REGSIZE (x) * 2; |
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986 } |
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987 |
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988 strcpy (out_ptr, "OK"); |
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989 } |
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990 |
| 2 | 991 int |
| 992 __process_packet (char *packet) | |
| 0 | 993 { |
| 2 | 994 int is_binary = 0; |
| 0 | 995 remcomOutBuffer[0] = 0; |
| 996 | |
| 997 switch (packet[0]) | |
| 998 { | |
| 999 case '?': | |
| 1000 { | |
| 2 | 1001 int sigval = __computeSignal (__get_trap_number ()); |
| 1002 remcomOutBuffer[0] = 'S'; | |
| 1003 remcomOutBuffer[1] = hexchars[(sigval >> 4) & 0xf]; | |
| 1004 remcomOutBuffer[2] = hexchars[sigval & 0xf]; | |
| 1005 remcomOutBuffer[3] = 0; | |
| 1006 break; | |
| 0 | 1007 } |
| 1008 | |
|
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1009 #ifdef __ECOS__ |
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1010 #if !defined(CYG_HAL_STARTUP_RAM) // Only for ROM based stubs |
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1011 case 'z': |
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1012 /* report IO buffer sizes so download can achieve optimal |
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1013 download speed */ |
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1014 { |
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1015 int i; |
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1016 i = __intToHex (remcomOutBuffer, BUFMAX, 32); |
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1017 remcomOutBuffer[i] = 0; |
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1018 break; |
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1019 } |
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1020 case 'd': |
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1021 /* toggle debug flag */ |
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1022 strcpy(remcomOutBuffer, "eCos GDB stubs" |
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1023 #ifdef CYGPKG_REDBOOT |
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1024 " [with RedBoot]" |
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1025 #endif |
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1026 " - built " __DATE__ " / " __TIME__); |
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1027 break; |
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1028 #endif |
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1029 #endif // __ECOS__ |
| 0 | 1030 |
| 1031 case 'q': | |
| 1032 /* general query packet */ | |
| 1033 process_query (&packet[1]); | |
| 1034 break; | |
| 1035 | |
| 1036 case 'Q': | |
| 1037 /* general set packet */ | |
| 1038 process_set (&packet[1]); | |
| 1039 break; | |
| 1040 | |
| 2 | 1041 case 'g': /* return the value of the CPU registers */ |
| 0 | 1042 { |
| 2 | 1043 char *ptr = remcomOutBuffer; |
|
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1044 stub_format_registers(ptr); |
| 2 | 1045 break; |
| 1046 } | |
| 0 | 1047 |
| 2 | 1048 case 'A': /* set program arguments */ |
| 1049 { | |
| 1050 if (packet[1] == '\0') | |
| 1051 { | |
| 1052 __free_program_args (); | |
| 1053 strcpy (remcomOutBuffer, "OK"); | |
| 1054 } | |
| 1055 else | |
| 1056 { | |
| 1057 target_register_t arglen, argnum; | |
| 1058 char *ptr = &packet[1]; | |
| 1059 | |
| 1060 while (1) | |
| 1061 { | |
| 1062 if (__hexToInt (&ptr, &arglen) | |
| 1063 && (*ptr++ == ',') | |
| 1064 && __hexToInt (&ptr, &argnum) | |
| 1065 && (*ptr++ == ',')) | |
| 1066 { | |
| 1067 if (arglen > 0) | |
| 1068 { | |
| 1069 char *s = __add_program_arg (argnum, arglen); | |
| 1070 if (s != NULL) | |
| 1071 { | |
| 1072 __hex2mem (ptr, s, arglen, 0); | |
| 1073 } | |
| 1074 ptr += arglen * 2; | |
| 1075 } | |
| 1076 | |
| 1077 if (*ptr == ',') | |
| 1078 ptr++; | |
| 1079 else | |
| 1080 break; | |
| 1081 } | |
| 1082 else | |
| 1083 break; | |
| 1084 } | |
| 1085 if (*ptr == '\0') | |
| 1086 strcpy (remcomOutBuffer, "OK"); | |
| 1087 else | |
| 1088 strcpy (remcomOutBuffer, "E01"); | |
| 1089 } | |
| 0 | 1090 } |
| 2 | 1091 break; |
| 0 | 1092 |
| 1093 case 'P': | |
| 2 | 1094 case 'G': /* set the value of the CPU registers - return OK */ |
| 0 | 1095 { |
|
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1096 char *in_ptr = &packet[0]; |
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1097 char *out_ptr = remcomOutBuffer; |
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1098 stub_update_registers(in_ptr, out_ptr); |
| 2 | 1099 break; |
| 0 | 1100 } |
| 1101 | |
| 2 | 1102 case 'm': /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */ |
| 0 | 1103 /* Try to read %x,%x. */ |
| 1104 { | |
| 2 | 1105 target_register_t addr, length; |
| 1106 char *ptr = &packet[1]; | |
| 0 | 1107 |
| 2 | 1108 if (__hexToInt (&ptr, &addr) |
| 1109 && *ptr++ == ',' | |
| 1110 && __hexToInt (&ptr, &length)) | |
| 1111 { | |
| 1112 if (__mem2hex ((char *) addr, remcomOutBuffer, length, 1)) | |
| 1113 break; | |
| 0 | 1114 |
| 2 | 1115 strcpy (remcomOutBuffer, "E03"); |
| 1116 } | |
| 1117 else | |
| 1118 strcpy (remcomOutBuffer, "E01"); | |
| 1119 break; | |
| 0 | 1120 } |
| 1121 | |
| 2 | 1122 case 'X': |
| 1123 /* XAA..AA,LLLL: Write LLLL escaped binary bytes at address AA.AA */ | |
| 1124 is_binary = 1; | |
| 1125 /* fall through */ | |
| 0 | 1126 case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */ |
| 1127 /* Try to read '%x,%x:'. */ | |
| 1128 { | |
| 2 | 1129 target_register_t addr, length; |
| 1130 char *ptr = &packet[1], buf[128]; | |
| 1131 int i; | |
| 1132 | |
| 1133 if (__hexToInt (&ptr, &addr) | |
| 1134 && *ptr++ == ',' | |
| 1135 && __hexToInt (&ptr, &length) | |
| 1136 && *ptr++ == ':') | |
| 1137 { | |
| 1138 if (is_binary) | |
| 1139 { | |
| 1140 while (length > 0) | |
| 1141 { | |
| 1142 for (i = 0; i < sizeof(buf) && i < length; i++) | |
| 1143 if ((buf[i] = *ptr++) == 0x7d) | |
| 1144 buf[i] = 0x20 | (*ptr++ & 0xff); | |
| 1145 | |
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1146 if (__write_mem_safe (buf, (void *)addr, i) != i) |
| 2 | 1147 break; |
| 0 | 1148 |
| 2 | 1149 length -= i; |
| 1150 addr += i; | |
| 1151 } | |
| 1152 if (length <= 0) | |
| 1153 strcpy (remcomOutBuffer, "OK"); | |
| 1154 else | |
| 1155 strcpy (remcomOutBuffer, "E03"); | |
| 1156 } | |
| 1157 else | |
| 1158 { | |
| 1159 if (__hex2mem (ptr, (char *) addr, length, 1) != NULL) | |
| 1160 strcpy (remcomOutBuffer, "OK"); | |
| 1161 else | |
| 1162 strcpy (remcomOutBuffer, "E03"); | |
| 1163 } | |
| 1164 } | |
| 1165 else | |
| 1166 strcpy (remcomOutBuffer, "E02"); | |
| 1167 break; | |
| 0 | 1168 } |
| 1169 | |
| 1170 case 'S': | |
| 2 | 1171 case 's': /* sAA..AA Step from address AA..AA (optional) */ |
| 0 | 1172 case 'C': |
| 2 | 1173 case 'c': /* cAA..AA Continue at address AA..AA (optional) */ |
| 0 | 1174 /* try to read optional parameter, pc unchanged if no parm */ |
| 1175 | |
| 1176 { | |
| 2 | 1177 char *ptr = &packet[1]; |
| 1178 target_register_t addr; | |
| 1179 target_register_t sigval = 0; | |
| 1180 | |
| 1181 if (packet[0] == 'C' || packet[0] == 'S') | |
| 1182 { | |
| 1183 __hexToInt (&ptr, &sigval); | |
| 1184 if (*ptr == ';') | |
| 1185 ptr++; | |
| 1186 } | |
| 0 | 1187 |
| 2 | 1188 if (__hexToInt (&ptr, &addr)) |
| 1189 set_pc (addr); | |
| 1190 | |
| 1191 /* Need to flush the instruction cache here, as we may have | |
| 1192 deposited a breakpoint, and the icache probably has no way of | |
| 1193 knowing that a data ref to some location may have changed | |
| 1194 something that is in the instruction cache. */ | |
| 1195 | |
| 1196 #ifdef __ECOS__ | |
| 1197 __data_cache (CACHE_FLUSH) ; | |
| 1198 #endif | |
| 1199 __instruction_cache (CACHE_FLUSH) ; | |
| 0 | 1200 |
| 2 | 1201 /* If we have a function to handle signals, call it. */ |
| 1202 if (sigval != 0 && __process_signal_vec != NULL) | |
| 1203 { | |
| 1204 /* If 0 is returned, we either ignored the signal or invoked a user | |
| 1205 handler. Otherwise, the user program should die. */ | |
| 1206 if (! __process_signal_vec (sigval)) | |
| 1207 sigval = 0; | |
| 1208 } | |
| 0 | 1209 |
| 2 | 1210 if (sigval != 0) |
| 1211 { | |
| 1212 sigval = SIGKILL; /* Always nuke the program */ | |
| 1213 __kill_program (sigval); | |
| 1214 return 0; | |
| 1215 } | |
| 0 | 1216 |
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1217 #ifdef __ECOS__ |
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1218 // CASE 102327 - watchpoints fight with output, so do not step |
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1219 // through $O packet output routines. |
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1220 #ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT |
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1221 if ( cyg_hal_gdb_break_is_set() ) { |
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1222 packet[0] = 'c'; // Force it to be a "continue" instead of step. |
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1223 cyg_hal_gdb_running_step = 1; // And tell the hal_stub... |
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1224 } |
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1225 #endif |
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1226 #endif |
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1227 |
| 2 | 1228 /* Set machine state to force a single step. */ |
| 1229 if (packet[0] == 's' || packet[0] == 'S') | |
| 1230 { | |
| 1231 lock_thread_scheduler (0); /* 0 == single-step */ | |
| 1232 #ifdef __ECOS__ | |
| 1233 // PR 19845 workaround: | |
| 1234 // Make sure the single-step magic affects the correct registers. | |
| 1235 _registers = ®isters[0]; | |
| 1236 #endif | |
| 1237 __single_step (); | |
| 1238 } | |
| 1239 else | |
| 1240 { | |
| 1241 lock_thread_scheduler (1); /* 1 == continue */ | |
| 1242 } | |
| 0 | 1243 |
|
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1244 #ifdef __ECOS__ |
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1245 /* Need to flush the data and instruction cache here, as we may have |
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1246 deposited a breakpoint in __single_step. */ |
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1247 |
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1248 __data_cache (CACHE_FLUSH) ; |
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1249 __instruction_cache (CACHE_FLUSH) ; |
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1250 #endif |
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|
1251 |
| 2 | 1252 return -1; |
| 0 | 1253 } |
| 1254 | |
| 1255 /* kill the program */ | |
| 1256 case 'k' : | |
| 1257 __process_exit_vec (); | |
| 1258 return 1; | |
| 2 | 1259 |
| 1260 case 'r': /* Reset */ | |
| 0 | 1261 __reset (); |
| 1262 break; | |
| 2 | 1263 |
| 0 | 1264 case 'H': |
| 1265 STUB_PKT_CHANGETHREAD (packet+1, remcomOutBuffer, 300) ; | |
| 1266 break ; | |
| 1267 case 'T' : | |
| 1268 STUB_PKT_THREAD_ALIVE (packet+1, remcomOutBuffer, 300) ; | |
| 1269 break ; | |
| 2 | 1270 case 'B': |
| 1271 /* breakpoint */ | |
| 0 | 1272 { |
| 2 | 1273 target_register_t addr; |
| 1274 char mode; | |
| 1275 char *ptr = &packet[1]; | |
| 1276 if (__hexToInt (&ptr, &addr) && *(ptr++) == ',') | |
| 1277 { | |
| 1278 mode = *(ptr++); | |
| 1279 if (mode == 'C') | |
| 1280 __remove_breakpoint (addr); | |
| 1281 else | |
| 1282 __set_breakpoint (addr); | |
| 1283 strcpy (remcomOutBuffer, "OK"); | |
| 1284 } | |
| 1285 else | |
| 1286 { | |
| 1287 strcpy (remcomOutBuffer, "E01"); | |
| 1288 } | |
| 1289 break; | |
| 1290 } | |
| 0 | 1291 |
| 2 | 1292 case 'b': /* bBB... Set baud rate to BB... */ |
| 1293 { | |
| 1294 target_register_t baudrate; | |
| 0 | 1295 |
| 2 | 1296 char *ptr = &packet[1]; |
| 1297 if (!__hexToInt (&ptr, &baudrate)) | |
| 1298 { | |
| 1299 strcpy (remcomOutBuffer, "B01"); | |
| 1300 break; | |
| 1301 } | |
| 1302 | |
| 1303 __putpacket ("OK"); /* Ack before changing speed */ | |
| 1304 __set_baud_rate (baudrate); | |
| 1305 break; | |
| 0 | 1306 } |
| 2 | 1307 default: |
| 1308 __process_target_packet (packet, remcomOutBuffer, 300); | |
| 1309 break; | |
| 0 | 1310 } |
| 1311 | |
| 1312 /* reply to the request */ | |
| 2 | 1313 __putpacket (remcomOutBuffer); |
| 0 | 1314 return 0; |
| 1315 } | |
| 1316 | |
| 1317 static void | |
| 1318 send_t_packet (int sigval) | |
| 1319 { | |
| 1320 __build_t_packet (sigval, remcomOutBuffer); | |
| 2 | 1321 __putpacket (remcomOutBuffer); |
| 0 | 1322 } |
| 1323 | |
| 1324 /* | |
| 1325 * This function does all command procesing for interfacing to gdb. | |
| 1326 */ | |
| 1327 | |
| 1328 static int | |
| 1329 process_exception (int sigval) | |
| 1330 { | |
| 1331 int status; | |
| 1332 | |
| 1333 /* Nasty. */ | |
| 1334 if (ungot_char < 0) | |
| 1335 send_t_packet (sigval); | |
| 1336 | |
| 1337 do { | |
| 1338 getpacket (remcomInBuffer); | |
| 2 | 1339 status = __process_packet (remcomInBuffer); |
| 0 | 1340 } while (status == 0); |
| 1341 | |
| 1342 if (status < 0) | |
| 1343 return 0; | |
| 1344 else | |
| 1345 return 1; | |
| 1346 } | |
| 1347 | |
| 1348 void | |
| 1349 __send_exit_status (int status) | |
| 1350 { | |
| 1351 remcomOutBuffer[0] = 'W'; | |
| 1352 remcomOutBuffer[1] = hexchars[(status >> 4) & 0xf]; | |
| 1353 remcomOutBuffer[2] = hexchars[status & 0xf]; | |
| 1354 remcomOutBuffer[3] = 0; | |
| 2 | 1355 __putpacket (remcomOutBuffer); |
| 0 | 1356 } |
| 1357 | |
| 2 | 1358 /* Read up to MAXLEN bytes from the remote GDB client, and store in DEST |
| 1359 (which is a pointer in the user program). BLOCK indicates what mode | |
| 1360 is being used; if it is set, we will wait for MAXLEN bytes to be | |
| 1361 entered. Otherwise, the function will return immediately with whatever | |
| 1362 bytes are waiting to be read. | |
| 1363 | |
| 1364 The value returned is the number of bytes read. A -1 indicates that an | |
| 1365 error of some sort occurred. */ | |
| 1366 | |
| 0 | 1367 int |
| 2 | 1368 __get_gdb_input (target_register_t dest, int maxlen, int block) |
| 0 | 1369 { |
| 1370 char buf[4]; | |
| 1371 int len, i; | |
| 2 | 1372 char d; |
| 0 | 1373 |
| 1374 buf[0] = 'I'; | |
| 1375 buf[1] = '0'; | |
| 1376 buf[2] = block ? '0' : '1'; | |
| 1377 buf[3] = 0; | |
| 2 | 1378 __putpacket (buf); |
| 0 | 1379 getpacket (remcomInBuffer); |
| 1380 if (remcomInBuffer[0] != 'I') | |
| 1381 return -1; | |
| 1382 len = stubhex (remcomInBuffer[1]) * 16 + stubhex (remcomInBuffer[2]); | |
| 1383 for (i = 0; i < len; i++) | |
| 1384 { | |
| 2 | 1385 d = stubhex (remcomInBuffer[3 + i * 2]) * 16; |
| 1386 d |= stubhex (remcomInBuffer[3 + i * 2 + 1]); | |
|
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1387 __write_mem_safe (&d, (void *)(dest + i), 1); |
| 0 | 1388 } |
| 2 | 1389 /* Write the trailing \0. */ |
| 1390 d = '\0'; | |
|
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1391 __write_mem_safe (&d, (void *)(dest + i), 1); |
| 0 | 1392 return len; |
| 1393 } | |
| 1394 | |
| 1395 void | |
| 1396 __output_hex_value (target_register_t i) | |
| 1397 { | |
| 1398 char buf[32], *ptr=buf+31; | |
| 1399 unsigned int x; | |
| 1400 | |
| 1401 *ptr = 0; | |
| 2 | 1402 for (x = 0; x < (sizeof (i) * 2); x++) |
| 0 | 1403 { |
| 1404 *(--ptr) = hexchars[i & 15]; | |
| 1405 i = i >> 4; | |
| 1406 } | |
| 1407 while (*ptr) | |
| 1408 { | |
| 1409 putDebugChar (*(ptr++)); | |
| 1410 } | |
| 1411 } | |
| 1412 | |
| 2 | 1413 /* Write the C-style string pointed to by STR to the GDB comm port. */ |
| 1414 void | |
| 1415 __putDebugStr (char *str) | |
| 1416 { | |
| 1417 while (*str) | |
| 1418 { | |
| 1419 putDebugChar (*str); | |
| 1420 str++; | |
| 1421 } | |
| 1422 } | |
| 1423 | |
| 1424 /* Send STRING_LEN bytes of STR to GDB, using 'O' packets. | |
| 1425 STR is assumed to be in the program being debugged. */ | |
| 1426 | |
| 0 | 1427 int |
| 2 | 1428 __output_gdb_string (target_register_t str, int string_len) |
| 0 | 1429 { |
| 2 | 1430 /* We will arbitrarily limit output packets to less than 400 bytes. */ |
| 1431 static char buf[400]; | |
| 0 | 1432 int x; |
| 1433 int len; | |
| 1434 | |
| 1435 if (string_len == 0) | |
| 2 | 1436 { |
| 1437 /* We can't do strlen on a user pointer. */ | |
| 1438 return -1; | |
| 1439 } | |
| 0 | 1440 |
| 2 | 1441 len = string_len; |
| 1442 while (len > 0) | |
| 0 | 1443 { |
| 2 | 1444 int packetlen = ((len < 175) ? len : 175); |
| 1445 buf[0] = 'O'; | |
| 1446 for (x = 0; x < packetlen; x++) | |
| 1447 { | |
| 1448 char c; | |
| 1449 | |
|
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1450 __read_mem_safe (&c, (void *)(str + x), 1); |
| 2 | 1451 buf[x*2+1] = hexchars[(c >> 4) & 0xf]; |
| 1452 buf[x*2+2] = hexchars[c % 16]; | |
| 1453 } | |
| 1454 str += x; | |
| 1455 len -= x; | |
| 1456 buf[x*2+1] = 0; | |
| 1457 __putpacket (buf); | |
| 0 | 1458 } |
| 1459 return string_len; | |
| 1460 } | |
| 1461 | |
| 1462 static void | |
| 1463 do_nothing (void) | |
| 1464 { | |
| 1465 /* mmmm */ | |
| 1466 } | |
| 1467 | |
| 1468 static int | |
| 1469 syscall_do_nothing (int junk) | |
| 1470 { | |
| 1471 return 0; | |
| 1472 } | |
| 1473 | |
| 1474 /* Start the stub running. */ | |
| 1475 void | |
| 2 | 1476 __switch_to_stub (void) |
| 0 | 1477 { |
| 1478 __process_exception_vec = process_exception; | |
|
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1479 #ifdef CYGPKG_CYGMON |
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1480 // Cygmon will have consumed the '$' character for this packet. |
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1481 // Let's put one in the unget buffer. |
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1482 // Actually, Cygmon does an unget, but since it uses different |
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1483 // unget handling, we need to do this here. |
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1484 ungetDebugChar('$'); |
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1485 #endif |
| 0 | 1486 } |
| 1487 | |
| 2 | 1488 #if ! defined(BOARD_SPECIFIC_STUB_INIT) |
| 1489 void | |
| 1490 initialize_stub (void) | |
| 1491 { | |
| 1492 set_debug_traps (); | |
| 1493 /* FIXME: This function should be renamed to specifically init the | |
| 1494 hardware required by debug operations. If initHardware is implemented at | |
| 1495 all, it should be called before main (). | |
| 1496 */ | |
| 1497 initHardware () ; | |
| 1498 /* This acks any stale packets , NOT an effective solution */ | |
| 1499 putDebugChar ('+'); | |
| 1500 } | |
| 1501 #endif | |
| 1502 | |
| 0 | 1503 void |
| 1504 ungetDebugChar (int c) | |
| 1505 { | |
| 1506 ungot_char = c; | |
| 1507 } | |
| 1508 | |
| 2 | 1509 void |
| 1510 __kill_program (int sigval) | |
| 0 | 1511 { |
| 1512 remcomOutBuffer[0] = 'X'; | |
| 1513 remcomOutBuffer[1] = hexchars[(sigval >> 4) & 15]; | |
| 1514 remcomOutBuffer[2] = hexchars[sigval & 15]; | |
| 1515 remcomOutBuffer[3] = 0; | |
| 2 | 1516 __putpacket (remcomOutBuffer); |
| 1517 } | |
| 1518 | |
| 1519 #define MAX_ARG_COUNT 20 | |
| 1520 #define MAX_ARGDATA 128 | |
| 1521 | |
| 1522 static char *program_argv [MAX_ARG_COUNT]; | |
| 1523 static int program_argc; | |
| 1524 static int last_program_arg; | |
| 1525 static char program_argstr [MAX_ARGDATA], *argptr; | |
| 1526 static int args_initted = 0; | |
| 1527 | |
| 1528 void | |
| 1529 __free_program_args (void) | |
| 1530 { | |
| 1531 last_program_arg = -1; | |
| 1532 program_argc = 0; | |
| 1533 program_argv [0] = NULL; | |
| 1534 argptr = program_argstr; | |
| 1535 args_initted = 1; | |
| 1536 } | |
| 1537 | |
| 1538 static char * | |
| 1539 __add_program_arg (int argc, uint32 len) | |
| 1540 { | |
| 1541 char *res; | |
| 1542 | |
| 1543 if (! args_initted) | |
| 1544 { | |
| 1545 __free_program_args (); | |
| 1546 } | |
| 1547 | |
| 1548 if ((argc >= (MAX_ARG_COUNT - 1)) | |
| 1549 || ((argptr - program_argstr + len) > MAX_ARGDATA)) | |
| 1550 { | |
| 1551 return NULL; | |
| 1552 } | |
| 1553 | |
| 1554 if (argc != last_program_arg) | |
| 1555 { | |
| 1556 if (argc >= program_argc) | |
| 1557 { | |
| 1558 program_argc = argc + 1; | |
| 1559 program_argv [program_argc] = NULL; | |
| 1560 } | |
| 1561 program_argv [argc] = argptr; | |
| 1562 last_program_arg = argc; | |
| 1563 } | |
| 1564 | |
| 1565 res = argptr; | |
| 1566 argptr += len; | |
| 1567 | |
| 1568 return res; | |
| 1569 } | |
| 1570 | |
| 1571 void | |
| 1572 __set_program_args (int argc, char **argv) | |
| 1573 { | |
| 1574 int x; | |
| 1575 | |
| 1576 __free_program_args (); | |
| 1577 if (argc) | |
| 1578 { | |
| 1579 for (x = 0; x < argc; x++) | |
| 1580 { | |
| 1581 uint32 len = strlen (argv[x])+1; | |
| 1582 char *s = __add_program_arg (x, len); | |
| 1583 | |
| 1584 if (s == NULL) | |
| 1585 return; | |
| 1586 | |
| 1587 memcpy (s, argv[x], len); | |
| 1588 } | |
| 1589 } | |
| 1590 } | |
| 1591 | |
| 1592 char ** | |
| 1593 __get_program_args (target_register_t argcPtr) | |
| 1594 { | |
| 1595 if (!args_initted) | |
| 1596 { | |
| 1597 __free_program_args (); | |
| 1598 } | |
|
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1599 __write_mem_safe ((char *) &program_argc, (void *)argcPtr, sizeof (program_argc)); |
| 2 | 1600 return program_argv; |
| 0 | 1601 } |
| 1602 | |
| 1603 /* Table used by the crc32 function to calcuate the checksum. */ | |
| 1604 static uint32 crc32_table[256]; | |
| 1605 static int tableInit = 0; | |
| 1606 | |
| 1607 /* | |
| 1608 Calculate a CRC-32 using LEN bytes of PTR. CRC is the initial CRC | |
| 1609 value. | |
| 1610 PTR is assumed to be a pointer in the user program. */ | |
| 1611 | |
| 1612 static uint32 | |
| 2 | 1613 crc32 (ptr, len, crc) |
| 1614 unsigned char *ptr; | |
| 1615 int len; | |
| 1616 uint32 crc; | |
| 0 | 1617 { |
| 1618 if (! tableInit) | |
| 1619 { | |
| 1620 /* Initialize the CRC table and the decoding table. */ | |
| 1621 uint32 i, j; | |
| 1622 uint32 c; | |
| 1623 | |
| 1624 tableInit = 1; | |
| 1625 for (i = 0; i < 256; i++) | |
| 2 | 1626 { |
| 1627 for (c = i << 24, j = 8; j > 0; --j) | |
| 1628 c = c & 0x80000000 ? (c << 1) ^ 0x04c11db7 : (c << 1); | |
| 1629 crc32_table[i] = c; | |
| 1630 } | |
| 0 | 1631 } |
| 1632 | |
| 1633 __mem_fault = 0; | |
| 1634 while (len--) | |
| 1635 { | |
| 1636 unsigned char ch; | |
| 1637 | |
|
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1638 __read_mem_safe (&ch, (void *)ptr, 1); |
| 0 | 1639 if (__mem_fault) |
| 2 | 1640 { |
| 1641 break; | |
| 1642 } | |
| 0 | 1643 crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ ch) & 255]; |
| 1644 ptr++; | |
| 1645 } | |
| 1646 return crc; | |
| 1647 } | |
| 1648 | |
| 1649 /* Handle the 'q' request */ | |
| 1650 | |
| 1651 static void | |
| 1652 process_query (char *pkt) | |
| 1653 { | |
| 1654 remcomOutBuffer[0] = '\0'; | |
| 2 | 1655 #ifdef __ECOS__ |
| 0 | 1656 if ('C' == pkt[0] && |
| 1657 'R' == pkt[1] && | |
| 1658 'C' == pkt[2] && | |
| 1659 ':' == pkt[3]) | |
| 2 | 1660 #else // __ECOS__ |
| 1661 if (strncmp (pkt, "CRC:", 4) == 0) | |
| 1662 #endif // __ECOS__ | |
| 0 | 1663 { |
| 1664 target_register_t startmem; | |
| 1665 target_register_t length; | |
| 1666 uint32 our_crc; | |
| 1667 | |
| 1668 pkt += 4; | |
| 1669 if (__hexToInt (&pkt, &startmem) | |
| 2 | 1670 && *(pkt++) == ',' |
| 1671 && __hexToInt (&pkt, &length)) | |
| 1672 { | |
| 1673 our_crc = crc32 ((unsigned char *) startmem, length, 0xffffffff); | |
| 1674 if (__mem_fault) | |
| 1675 { | |
| 1676 strcpy (remcomOutBuffer, "E01"); | |
| 1677 } | |
| 1678 else | |
| 1679 { | |
| 1680 int numb = __intToHex (remcomOutBuffer + 1, our_crc, 32); | |
| 1681 remcomOutBuffer[0] = 'C'; | |
| 1682 remcomOutBuffer[numb + 1] = 0; | |
| 1683 } | |
| 1684 } | |
| 0 | 1685 return; |
| 1686 } | |
| 1687 else | |
| 1688 { | |
| 1689 char ch ; | |
| 1690 char * subpkt ; | |
| 1691 ch = *pkt ; | |
| 1692 subpkt = pkt + 1 ; | |
| 1693 switch (ch) | |
| 2 | 1694 { |
| 1695 case 'L' : /* threadlistquery */ | |
| 1696 STUB_PKT_GETTHREADLIST (subpkt, remcomOutBuffer, 300); | |
| 1697 break ; | |
| 1698 case 'P' : /* Thread or process information request */ | |
| 1699 STUB_PKT_GETTHREADINFO (subpkt, remcomOutBuffer, 300); | |
| 1700 break ; | |
| 1701 case 'C' : /* current thread query */ | |
| 1702 STUB_PKT_CURRTHREAD(subpkt, remcomOutBuffer, sizeof(remcomOutBuffer)); | |
| 1703 break; | |
| 1704 default: | |
| 1705 __process_target_query (pkt, remcomOutBuffer, 300); | |
| 1706 break ; | |
| 1707 } | |
| 0 | 1708 } |
| 1709 } | |
| 1710 | |
| 1711 /* Handle the 'Q' request */ | |
| 1712 | |
| 1713 static void | |
| 1714 process_set (char *pkt) | |
| 1715 { | |
| 1716 char ch ; | |
| 1717 ch = *pkt ; | |
| 1718 | |
| 1719 switch (ch) | |
| 1720 { | |
| 1721 case 'p' : /* Set current process or thread */ | |
| 1722 /* reserve the packet id even if support is not present */ | |
| 1723 /* Dont strip the 'p' off the header, there are several variations of | |
| 2 | 1724 this packet */ |
| 0 | 1725 STUB_PKT_CHANGETHREAD (pkt, remcomOutBuffer, 300) ; |
| 1726 break ; | |
| 1727 default: | |
| 1728 __process_target_set (pkt, remcomOutBuffer, 300); | |
| 1729 break ; | |
| 1730 } | |
| 1731 } | |
| 1732 #endif // CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS |