| 1 | /* Remote debugging interface for Densan DVE-R3900 ROM monitor for |
| 2 | GDB, the GNU debugger. |
| 3 | Copyright 1997 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "gdbcore.h" |
| 23 | #include "target.h" |
| 24 | #include "monitor.h" |
| 25 | #include "serial.h" |
| 26 | #include "inferior.h" |
| 27 | #include "command.h" |
| 28 | #include "gdb_string.h" |
| 29 | #include <time.h> |
| 30 | |
| 31 | /* Type of function passed to bfd_map_over_sections. */ |
| 32 | |
| 33 | typedef void (*section_map_func) PARAMS ((bfd *abfd, asection *sect, PTR obj)); |
| 34 | |
| 35 | /* Packet escape character used by Densan monitor. */ |
| 36 | |
| 37 | #define PESC 0xdc |
| 38 | |
| 39 | /* Maximum packet size. This is actually smaller than necessary |
| 40 | just to be safe. */ |
| 41 | |
| 42 | #define MAXPSIZE 1024 |
| 43 | |
| 44 | /* External functions. */ |
| 45 | |
| 46 | extern void report_transfer_performance PARAMS ((unsigned long, |
| 47 | time_t, time_t)); |
| 48 | |
| 49 | /* Certain registers are "bitmapped", in that the monitor can only display |
| 50 | them or let the user modify them as a series of named bitfields. |
| 51 | This structure describes a field in a bitmapped register. */ |
| 52 | |
| 53 | struct bit_field |
| 54 | { |
| 55 | char *prefix; /* string appearing before the value */ |
| 56 | char *suffix; /* string appearing after the value */ |
| 57 | char *user_name; /* name used by human when entering field value */ |
| 58 | int length; /* number of bits in the field */ |
| 59 | int start; /* starting (least significant) bit number of field */ |
| 60 | }; |
| 61 | |
| 62 | /* Local functions for register manipulation. */ |
| 63 | |
| 64 | static void r3900_supply_register PARAMS ((char *regname, int regnamelen, |
| 65 | char *val, int vallen)); |
| 66 | static void fetch_bad_vaddr PARAMS ((void)); |
| 67 | static unsigned long fetch_fields PARAMS ((struct bit_field *bf)); |
| 68 | static void fetch_bitmapped_register PARAMS ((int regno, |
| 69 | struct bit_field *bf)); |
| 70 | static void r3900_fetch_registers PARAMS ((int regno)); |
| 71 | static void store_bitmapped_register PARAMS ((int regno, |
| 72 | struct bit_field *bf)); |
| 73 | static void r3900_store_registers PARAMS ((int regno)); |
| 74 | |
| 75 | /* Local functions for fast binary loading. */ |
| 76 | |
| 77 | static void write_long PARAMS ((char *buf, long n)); |
| 78 | static void write_long_le PARAMS ((char *buf, long n)); |
| 79 | static int debug_readchar PARAMS ((int hex)); |
| 80 | static void debug_write PARAMS ((unsigned char *buf, int buflen)); |
| 81 | static void ignore_packet PARAMS ((void)); |
| 82 | static void send_packet PARAMS ((char type, unsigned char *buf, int buflen, |
| 83 | int seq)); |
| 84 | static void process_read_request PARAMS ((unsigned char *buf, int buflen)); |
| 85 | static void count_section PARAMS ((bfd *abfd, asection *s, |
| 86 | unsigned int *section_count)); |
| 87 | static void load_section PARAMS ((bfd *abfd, asection *s, |
| 88 | unsigned int *data_count)); |
| 89 | static void r3900_load PARAMS ((char *filename, int from_tty)); |
| 90 | |
| 91 | /* Miscellaneous local functions. */ |
| 92 | |
| 93 | static void r3900_open PARAMS ((char *args, int from_tty)); |
| 94 | |
| 95 | |
| 96 | /* Pointers to static functions in monitor.c for fetching and storing |
| 97 | registers. We can't use these function in certain cases where the Densan |
| 98 | monitor acts perversely: for registers that it displays in bit-map |
| 99 | format, and those that can't be modified at all. In those cases |
| 100 | we have to use our own functions to fetch and store their values. */ |
| 101 | |
| 102 | static void (*orig_monitor_fetch_registers) PARAMS ((int regno)); |
| 103 | static void (*orig_monitor_store_registers) PARAMS ((int regno)); |
| 104 | |
| 105 | /* Pointer to static function in monitor. for loading programs. |
| 106 | We use this function for loading S-records via the serial link. */ |
| 107 | |
| 108 | static void (*orig_monitor_load) PARAMS ((char *file, int from_tty)); |
| 109 | |
| 110 | /* This flag is set if a fast ethernet download should be used. */ |
| 111 | |
| 112 | static int ethernet = 0; |
| 113 | |
| 114 | /* This array of registers needs to match the indexes used by GDB. The |
| 115 | whole reason this exists is because the various ROM monitors use |
| 116 | different names than GDB does, and don't support all the registers |
| 117 | either. */ |
| 118 | |
| 119 | static char *r3900_regnames[NUM_REGS] = |
| 120 | { |
| 121 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| 122 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", |
| 123 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", |
| 124 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", |
| 125 | |
| 126 | "S", /* PS_REGNUM */ |
| 127 | "l", /* LO_REGNUM */ |
| 128 | "h", /* HI_REGNUM */ |
| 129 | "B", /* BADVADDR_REGNUM */ |
| 130 | "Pcause", /* CAUSE_REGNUM */ |
| 131 | "p" /* PC_REGNUM */ |
| 132 | }; |
| 133 | |
| 134 | |
| 135 | /* Table of register names produced by monitor's register dump command. */ |
| 136 | |
| 137 | static struct reg_entry |
| 138 | { |
| 139 | char *name; |
| 140 | int regno; |
| 141 | } reg_table[] = |
| 142 | { |
| 143 | { "r0_zero", 0 }, { "r1_at", 1 }, { "r2_v0", 2 }, { "r3_v1", 3 }, |
| 144 | { "r4_a0", 4 }, { "r5_a1", 5 }, { "r6_a2", 6 }, { "r7_a3", 7 }, |
| 145 | { "r8_t0", 8 }, { "r9_t1", 9 }, { "r10_t2", 10 }, { "r11_t3", 11 }, |
| 146 | { "r12_t4", 12 }, { "r13_t5", 13 }, { "r14_t6", 14 }, { "r15_t7", 15 }, |
| 147 | { "r16_s0", 16 }, { "r17_s1", 17 }, { "r18_s2", 18 }, { "r19_s3", 19 }, |
| 148 | { "r20_s4", 20 }, { "r21_s5", 21 }, { "r22_s6", 22 }, { "r23_s7", 23 }, |
| 149 | { "r24_t8", 24 }, { "r25_t9", 25 }, { "r26_k0", 26 }, { "r27_k1", 27 }, |
| 150 | { "r28_gp", 28 }, { "r29_sp", 29 }, { "r30_fp", 30 }, { "r31_ra", 31 }, |
| 151 | { "HI", HI_REGNUM }, |
| 152 | { "LO", LO_REGNUM }, |
| 153 | { "PC", PC_REGNUM }, |
| 154 | { "BadV", BADVADDR_REGNUM }, |
| 155 | { NULL, 0 } |
| 156 | }; |
| 157 | |
| 158 | |
| 159 | /* The monitor displays the cache register along with the status register, |
| 160 | as if they were a single register. So when we want to fetch the |
| 161 | status register, parse but otherwise ignore the fields of the |
| 162 | cache register that the monitor displays. Register fields that should |
| 163 | be ignored have a length of zero in the tables below. */ |
| 164 | |
| 165 | static struct bit_field status_fields [] = |
| 166 | { |
| 167 | /* Status register portion */ |
| 168 | { "SR[<CU=", " ", "cu", 4, 28 }, |
| 169 | { "RE=", " ", "re", 1, 25 }, |
| 170 | { "BEV=", " ", "bev", 1, 22 }, |
| 171 | { "TS=", " ", "ts", 1, 21 }, |
| 172 | { "Nmi=", " ", "nmi", 1, 20 }, |
| 173 | { "INT=", " ", "int", 6, 10 }, |
| 174 | { "SW=", ">]", "sw", 2, 8 }, |
| 175 | { "[<KUO=", " ", "kuo", 1, 5 }, |
| 176 | { "IEO=", " ", "ieo", 1, 4 }, |
| 177 | { "KUP=", " ", "kup", 1, 3 }, |
| 178 | { "IEP=", " ", "iep", 1, 2 }, |
| 179 | { "KUC=", " ", "kuc", 1, 1 }, |
| 180 | { "IEC=", ">]", "iec", 1, 0 }, |
| 181 | |
| 182 | /* Cache register portion (dummy for parsing only) */ |
| 183 | { "CR[<IalO="," ", "ialo", 0, 13 }, |
| 184 | { "DalO=", " ", "dalo", 0, 12 }, |
| 185 | { "IalP=", " ", "ialp", 0, 11 }, |
| 186 | { "DalP=", " ", "dalp", 0, 10 }, |
| 187 | { "IalC=", " ", "ialc", 0, 9 }, |
| 188 | { "DalC=", ">] ", "dalc", 0, 8 }, |
| 189 | |
| 190 | { NULL, NULL, 0, 0 } /* end of table marker */ |
| 191 | }; |
| 192 | |
| 193 | |
| 194 | #if 0 /* FIXME: Enable when we add support for modifying cache register. */ |
| 195 | static struct bit_field cache_fields [] = |
| 196 | { |
| 197 | /* Status register portion (dummy for parsing only) */ |
| 198 | { "SR[<CU=", " ", "cu", 0, 28 }, |
| 199 | { "RE=", " ", "re", 0, 25 }, |
| 200 | { "BEV=", " ", "bev", 0, 22 }, |
| 201 | { "TS=", " ", "ts", 0, 21 }, |
| 202 | { "Nmi=", " ", "nmi", 0, 20 }, |
| 203 | { "INT=", " ", "int", 0, 10 }, |
| 204 | { "SW=", ">]", "sw", 0, 8 }, |
| 205 | { "[<KUO=", " ", "kuo", 0, 5 }, |
| 206 | { "IEO=", " ", "ieo", 0, 4 }, |
| 207 | { "KUP=", " ", "kup", 0, 3 }, |
| 208 | { "IEP=", " ", "iep", 0, 2 }, |
| 209 | { "KUC=", " ", "kuc", 0, 1 }, |
| 210 | { "IEC=", ">]", "iec", 0, 0 }, |
| 211 | |
| 212 | /* Cache register portion */ |
| 213 | { "CR[<IalO="," ", "ialo", 1, 13 }, |
| 214 | { "DalO=", " ", "dalo", 1, 12 }, |
| 215 | { "IalP=", " ", "ialp", 1, 11 }, |
| 216 | { "DalP=", " ", "dalp", 1, 10 }, |
| 217 | { "IalC=", " ", "ialc", 1, 9 }, |
| 218 | { "DalC=", ">] ", "dalc", 1, 8 }, |
| 219 | |
| 220 | { NULL, NULL, NULL, 0, 0 } /* end of table marker */ |
| 221 | }; |
| 222 | #endif |
| 223 | |
| 224 | |
| 225 | static struct bit_field cause_fields[] = |
| 226 | { |
| 227 | { "<BD=", " ", "bd", 1, 31 }, |
| 228 | { "CE=", " ", "ce", 2, 28 }, |
| 229 | { "IP=", " ", "ip", 6, 10 }, |
| 230 | { "SW=", " ", "sw", 2, 8 }, |
| 231 | { "EC=", ">]" , "ec", 5, 2 }, |
| 232 | |
| 233 | { NULL, NULL, NULL, 0, 0 } /* end of table marker */ |
| 234 | }; |
| 235 | |
| 236 | |
| 237 | /* The monitor prints register values in the form |
| 238 | |
| 239 | regname = xxxx xxxx |
| 240 | |
| 241 | We look up the register name in a table, and remove the embedded space in |
| 242 | the hex value before passing it to monitor_supply_register. */ |
| 243 | |
| 244 | static void |
| 245 | r3900_supply_register (regname, regnamelen, val, vallen) |
| 246 | char *regname; |
| 247 | int regnamelen; |
| 248 | char *val; |
| 249 | int vallen; |
| 250 | { |
| 251 | int regno = -1; |
| 252 | int i; |
| 253 | char valbuf[10]; |
| 254 | char *p; |
| 255 | |
| 256 | /* Perform some sanity checks on the register name and value. */ |
| 257 | if (regnamelen < 2 || regnamelen > 7 || vallen != 9) |
| 258 | return; |
| 259 | |
| 260 | /* Look up the register name. */ |
| 261 | for (i = 0; reg_table[i].name != NULL; i++) |
| 262 | { |
| 263 | int rlen = strlen (reg_table[i].name); |
| 264 | if (rlen == regnamelen && strncmp (regname, reg_table[i].name, rlen) == 0) |
| 265 | { |
| 266 | regno = reg_table[i].regno; |
| 267 | break; |
| 268 | } |
| 269 | } |
| 270 | if (regno == -1) |
| 271 | return; |
| 272 | |
| 273 | /* Copy the hex value to a buffer and eliminate the embedded space. */ |
| 274 | for (i = 0, p = valbuf; i < vallen; i++) |
| 275 | if (val[i] != ' ') |
| 276 | *p++ = val[i]; |
| 277 | *p = '\0'; |
| 278 | |
| 279 | monitor_supply_register (regno, valbuf); |
| 280 | } |
| 281 | |
| 282 | |
| 283 | /* Fetch the BadVaddr register. Unlike the other registers, this |
| 284 | one can't be modified, and the monitor won't even prompt to let |
| 285 | you modify it. */ |
| 286 | |
| 287 | static void |
| 288 | fetch_bad_vaddr() |
| 289 | { |
| 290 | char buf[20]; |
| 291 | |
| 292 | monitor_printf ("xB\r"); |
| 293 | monitor_expect ("BadV=", NULL, 0); |
| 294 | monitor_expect_prompt (buf, sizeof(buf)); |
| 295 | monitor_supply_register (BADVADDR_REGNUM, buf); |
| 296 | } |
| 297 | |
| 298 | |
| 299 | /* Read a series of bit fields from the monitor, and return their |
| 300 | combined binary value. */ |
| 301 | |
| 302 | static unsigned long |
| 303 | fetch_fields (bf) |
| 304 | struct bit_field *bf; |
| 305 | { |
| 306 | char buf[20]; |
| 307 | unsigned long val = 0; |
| 308 | unsigned long bits; |
| 309 | |
| 310 | for ( ; bf->prefix != NULL; bf++) |
| 311 | { |
| 312 | monitor_expect (bf->prefix, NULL, 0); /* get prefix */ |
| 313 | monitor_expect (bf->suffix, buf, sizeof (buf)); /* hex value, suffix */ |
| 314 | if (bf->length != 0) |
| 315 | { |
| 316 | bits = strtoul (buf, NULL, 16); /* get field value */ |
| 317 | bits &= ((1 << bf->length) - 1); /* mask out useless bits */ |
| 318 | val |= bits << bf->start; /* insert into register */ |
| 319 | } |
| 320 | |
| 321 | } |
| 322 | |
| 323 | return val; |
| 324 | } |
| 325 | |
| 326 | |
| 327 | static void |
| 328 | fetch_bitmapped_register (regno, bf) |
| 329 | int regno; |
| 330 | struct bit_field *bf; |
| 331 | { |
| 332 | unsigned long val; |
| 333 | unsigned char regbuf[MAX_REGISTER_RAW_SIZE]; |
| 334 | |
| 335 | monitor_printf ("x%s\r", r3900_regnames[regno]); |
| 336 | val = fetch_fields (bf); |
| 337 | monitor_printf (".\r"); |
| 338 | monitor_expect_prompt (NULL, 0); |
| 339 | |
| 340 | /* supply register stores in target byte order, so swap here */ |
| 341 | |
| 342 | store_unsigned_integer (regbuf, REGISTER_RAW_SIZE (regno), val); |
| 343 | supply_register (regno, regbuf); |
| 344 | |
| 345 | } |
| 346 | |
| 347 | |
| 348 | /* Fetch all registers (if regno is -1), or one register from the |
| 349 | monitor. For most registers, we can use the generic monitor_ |
| 350 | monitor_fetch_registers function. But others are displayed in |
| 351 | a very unusual fashion by the monitor, and must be handled specially. */ |
| 352 | |
| 353 | static void |
| 354 | r3900_fetch_registers (regno) |
| 355 | int regno; |
| 356 | { |
| 357 | switch (regno) |
| 358 | { |
| 359 | case BADVADDR_REGNUM: |
| 360 | fetch_bad_vaddr (); |
| 361 | return; |
| 362 | case PS_REGNUM: |
| 363 | fetch_bitmapped_register (PS_REGNUM, status_fields); |
| 364 | return; |
| 365 | case CAUSE_REGNUM: |
| 366 | fetch_bitmapped_register (CAUSE_REGNUM, cause_fields); |
| 367 | return; |
| 368 | default: |
| 369 | orig_monitor_fetch_registers (regno); |
| 370 | } |
| 371 | } |
| 372 | |
| 373 | |
| 374 | /* Write the new value of the bitmapped register to the monitor. */ |
| 375 | |
| 376 | static void |
| 377 | store_bitmapped_register (regno, bf) |
| 378 | int regno; |
| 379 | struct bit_field *bf; |
| 380 | { |
| 381 | unsigned long oldval, newval; |
| 382 | |
| 383 | /* Fetch the current value of the register. */ |
| 384 | monitor_printf ("x%s\r", r3900_regnames[regno]); |
| 385 | oldval = fetch_fields (bf); |
| 386 | newval = read_register (regno); |
| 387 | |
| 388 | /* To save time, write just the fields that have changed. */ |
| 389 | for ( ; bf->prefix != NULL; bf++) |
| 390 | { |
| 391 | if (bf->length != 0) |
| 392 | { |
| 393 | unsigned long oldbits, newbits, mask; |
| 394 | |
| 395 | mask = (1 << bf->length) - 1; |
| 396 | oldbits = (oldval >> bf->start) & mask; |
| 397 | newbits = (newval >> bf->start) & mask; |
| 398 | if (oldbits != newbits) |
| 399 | monitor_printf ("%s %x ", bf->user_name, newbits); |
| 400 | } |
| 401 | } |
| 402 | |
| 403 | monitor_printf (".\r"); |
| 404 | monitor_expect_prompt (NULL, 0); |
| 405 | } |
| 406 | |
| 407 | |
| 408 | static void |
| 409 | r3900_store_registers (regno) |
| 410 | int regno; |
| 411 | { |
| 412 | switch (regno) |
| 413 | { |
| 414 | case PS_REGNUM: |
| 415 | store_bitmapped_register (PS_REGNUM, status_fields); |
| 416 | return; |
| 417 | case CAUSE_REGNUM: |
| 418 | store_bitmapped_register (CAUSE_REGNUM, cause_fields); |
| 419 | return; |
| 420 | default: |
| 421 | orig_monitor_store_registers (regno); |
| 422 | } |
| 423 | } |
| 424 | |
| 425 | |
| 426 | /* Write a 4-byte integer to the buffer in big-endian order. */ |
| 427 | |
| 428 | static void |
| 429 | write_long (buf, n) |
| 430 | char *buf; |
| 431 | long n; |
| 432 | { |
| 433 | buf[0] = (n >> 24) & 0xff; |
| 434 | buf[1] = (n >> 16) & 0xff; |
| 435 | buf[2] = (n >> 8) & 0xff; |
| 436 | buf[3] = n & 0xff; |
| 437 | } |
| 438 | |
| 439 | |
| 440 | /* Write a 4-byte integer to the buffer in little-endian order. */ |
| 441 | |
| 442 | static void |
| 443 | write_long_le (buf, n) |
| 444 | char *buf; |
| 445 | long n; |
| 446 | { |
| 447 | buf[0] = n & 0xff; |
| 448 | buf[1] = (n >> 8) & 0xff; |
| 449 | buf[2] = (n >> 16) & 0xff; |
| 450 | buf[3] = (n >> 24) & 0xff; |
| 451 | } |
| 452 | |
| 453 | |
| 454 | /* Read a character from the monitor. If remote debugging is on, |
| 455 | print the received character. If HEX is non-zero, print the |
| 456 | character in hexadecimal; otherwise, print it in ASCII. */ |
| 457 | |
| 458 | static int |
| 459 | debug_readchar (hex) |
| 460 | int hex; |
| 461 | { |
| 462 | char buf [10]; |
| 463 | int c = monitor_readchar (); |
| 464 | |
| 465 | if (remote_debug > 0) |
| 466 | { |
| 467 | if (hex) |
| 468 | sprintf (buf, "[%02x]", c & 0xff); |
| 469 | else if (c == '\0') |
| 470 | strcpy (buf, "\\0"); |
| 471 | else |
| 472 | { |
| 473 | buf[0] = c; |
| 474 | buf[1] = '\0'; |
| 475 | } |
| 476 | puts_debug ("Read -->", buf, "<--"); |
| 477 | } |
| 478 | return c; |
| 479 | } |
| 480 | |
| 481 | |
| 482 | /* Send a buffer of characters to the monitor. If remote debugging is on, |
| 483 | print the sent buffer in hex. */ |
| 484 | |
| 485 | static void |
| 486 | debug_write (buf, buflen) |
| 487 | unsigned char *buf; |
| 488 | int buflen; |
| 489 | { |
| 490 | char s[10]; |
| 491 | |
| 492 | monitor_write (buf, buflen); |
| 493 | |
| 494 | if (remote_debug > 0) |
| 495 | { |
| 496 | while (buflen-- > 0) |
| 497 | { |
| 498 | sprintf (s, "[%02x]", *buf & 0xff); |
| 499 | puts_debug ("Sent -->", s, "<--"); |
| 500 | buf++; |
| 501 | } |
| 502 | } |
| 503 | } |
| 504 | |
| 505 | |
| 506 | /* Ignore a packet sent to us by the monitor. It send packets |
| 507 | when its console is in "communications interface" mode. A packet |
| 508 | is of this form: |
| 509 | |
| 510 | start of packet flag (one byte: 0xdc) |
| 511 | packet type (one byte) |
| 512 | length (low byte) |
| 513 | length (high byte) |
| 514 | data (length bytes) |
| 515 | |
| 516 | The last two bytes of the data field are a checksum, but we don't |
| 517 | bother to verify it. |
| 518 | */ |
| 519 | |
| 520 | static void |
| 521 | ignore_packet () |
| 522 | { |
| 523 | int c; |
| 524 | int len; |
| 525 | |
| 526 | /* Ignore lots of trash (messages about section addresses, for example) |
| 527 | until we see the start of a packet. */ |
| 528 | for (len = 0; len < 256; len++) |
| 529 | { |
| 530 | c = debug_readchar (0); |
| 531 | if (c == PESC) |
| 532 | break; |
| 533 | } |
| 534 | if (len == 8) |
| 535 | error ("Packet header byte not found; %02x seen instead.", c); |
| 536 | |
| 537 | /* Read the packet type and length. */ |
| 538 | c = debug_readchar (1); /* type */ |
| 539 | |
| 540 | c = debug_readchar (1); /* low byte of length */ |
| 541 | len = c & 0xff; |
| 542 | |
| 543 | c = debug_readchar (1); /* high byte of length */ |
| 544 | len += (c & 0xff) << 8; |
| 545 | |
| 546 | /* Ignore the rest of the packet. */ |
| 547 | while (len-- > 0) |
| 548 | c = debug_readchar (1); |
| 549 | } |
| 550 | |
| 551 | |
| 552 | /* Encapsulate some data into a packet and send it to the monitor. |
| 553 | |
| 554 | The 'p' packet is a special case. This is a packet we send |
| 555 | in response to a read ('r') packet from the monitor. This function |
| 556 | appends a one-byte sequence number to the data field of such a packet. |
| 557 | */ |
| 558 | |
| 559 | static void |
| 560 | send_packet (type, buf, buflen, seq) |
| 561 | char type; |
| 562 | unsigned char *buf; |
| 563 | int buflen, seq; |
| 564 | { |
| 565 | unsigned char hdr[4]; |
| 566 | int len = buflen; |
| 567 | int sum, i; |
| 568 | |
| 569 | /* If this is a 'p' packet, add one byte for a sequence number. */ |
| 570 | if (type == 'p') |
| 571 | len++; |
| 572 | |
| 573 | /* If the buffer has a non-zero length, add two bytes for a checksum. */ |
| 574 | if (len > 0) |
| 575 | len += 2; |
| 576 | |
| 577 | /* Write the packet header. */ |
| 578 | hdr[0] = PESC; |
| 579 | hdr[1] = type; |
| 580 | hdr[2] = len & 0xff; |
| 581 | hdr[3] = (len >> 8) & 0xff; |
| 582 | debug_write (hdr, sizeof (hdr)); |
| 583 | |
| 584 | if (len) |
| 585 | { |
| 586 | /* Write the packet data. */ |
| 587 | debug_write (buf, buflen); |
| 588 | |
| 589 | /* Write the sequence number if this is a 'p' packet. */ |
| 590 | if (type == 'p') |
| 591 | { |
| 592 | hdr[0] = seq; |
| 593 | debug_write (hdr, 1); |
| 594 | } |
| 595 | |
| 596 | /* Write the checksum. */ |
| 597 | sum = 0; |
| 598 | for (i = 0; i < buflen; i++) |
| 599 | { |
| 600 | int tmp = (buf[i] & 0xff); |
| 601 | if (i & 1) |
| 602 | sum += tmp; |
| 603 | else |
| 604 | sum += tmp << 8; |
| 605 | } |
| 606 | if (type == 'p') |
| 607 | { |
| 608 | if (buflen & 1) |
| 609 | sum += (seq & 0xff); |
| 610 | else |
| 611 | sum += (seq & 0xff) << 8; |
| 612 | } |
| 613 | sum = (sum & 0xffff) + ((sum >> 16) & 0xffff); |
| 614 | sum += (sum >> 16) & 1; |
| 615 | sum = ~sum; |
| 616 | |
| 617 | hdr[0] = (sum >> 8) & 0xff; |
| 618 | hdr[1] = sum & 0xff; |
| 619 | debug_write (hdr, 2); |
| 620 | } |
| 621 | } |
| 622 | |
| 623 | |
| 624 | /* Respond to an expected read request from the monitor by sending |
| 625 | data in chunks. Handle all acknowledgements and handshaking packets. |
| 626 | |
| 627 | The monitor expects a response consisting of a one or more 'p' packets, |
| 628 | each followed by a portion of the data requested. The 'p' packet |
| 629 | contains only a four-byte integer, the value of which is the number |
| 630 | of bytes of data we are about to send. Following the 'p' packet, |
| 631 | the monitor expects the data bytes themselves in raw, unpacketized, |
| 632 | form, without even a checksum. |
| 633 | */ |
| 634 | |
| 635 | static void |
| 636 | process_read_request (buf, buflen) |
| 637 | unsigned char *buf; |
| 638 | int buflen; |
| 639 | { |
| 640 | unsigned char len[4]; |
| 641 | int i, chunk; |
| 642 | unsigned char seq; |
| 643 | |
| 644 | /* Discard the read request. FIXME: we have to hope it's for |
| 645 | the exact number of bytes we want to send; should check for this. */ |
| 646 | ignore_packet (); |
| 647 | |
| 648 | for (i = chunk = 0, seq = 0; i < buflen; i += chunk, seq++) |
| 649 | { |
| 650 | /* Don't send more than MAXPSIZE bytes at a time. */ |
| 651 | chunk = buflen - i; |
| 652 | if (chunk > MAXPSIZE) |
| 653 | chunk = MAXPSIZE; |
| 654 | |
| 655 | /* Write a packet containing the number of bytes we are sending. */ |
| 656 | write_long_le (len, chunk); |
| 657 | send_packet ('p', len, sizeof (len), seq); |
| 658 | |
| 659 | /* Write the data in raw form following the packet. */ |
| 660 | debug_write (&buf[i], chunk); |
| 661 | |
| 662 | /* Discard the ACK packet. */ |
| 663 | ignore_packet (); |
| 664 | } |
| 665 | |
| 666 | /* Send an "end of data" packet. */ |
| 667 | send_packet ('e', "", 0, 0); |
| 668 | } |
| 669 | |
| 670 | |
| 671 | /* Count loadable sections (helper function for r3900_load). */ |
| 672 | |
| 673 | static void |
| 674 | count_section (abfd, s, section_count) |
| 675 | bfd *abfd; |
| 676 | asection *s; |
| 677 | unsigned int *section_count; |
| 678 | { |
| 679 | if (s->flags & SEC_LOAD && bfd_section_size (abfd, s) != 0) |
| 680 | (*section_count)++; |
| 681 | } |
| 682 | |
| 683 | |
| 684 | /* Load a single BFD section (helper function for r3900_load). |
| 685 | |
| 686 | WARNING: this code is filled with assumptions about how |
| 687 | the Densan monitor loads programs. The monitor issues |
| 688 | packets containing read requests, but rather than respond |
| 689 | to them in an general way, we expect them to following |
| 690 | a certain pattern. |
| 691 | |
| 692 | For example, we know that the monitor will start loading by |
| 693 | issuing an 8-byte read request for the binary file header. |
| 694 | We know this is coming and ignore the actual contents |
| 695 | of the read request packet. |
| 696 | */ |
| 697 | |
| 698 | static void |
| 699 | load_section (abfd, s, data_count) |
| 700 | bfd *abfd; |
| 701 | asection *s; |
| 702 | unsigned int *data_count; |
| 703 | { |
| 704 | if (s->flags & SEC_LOAD) |
| 705 | { |
| 706 | bfd_size_type section_size = bfd_section_size (abfd, s); |
| 707 | bfd_vma section_base = bfd_section_lma (abfd, s); |
| 708 | unsigned char *buffer; |
| 709 | unsigned char header[8]; |
| 710 | |
| 711 | /* Don't output zero-length sections. */ |
| 712 | if (section_size == 0) |
| 713 | return; |
| 714 | if (data_count) |
| 715 | *data_count += section_size; |
| 716 | |
| 717 | /* Print some fluff about the section being loaded. */ |
| 718 | printf_filtered ("Loading section %s, size 0x%lx lma ", |
| 719 | bfd_section_name (abfd, s), (long)section_size); |
| 720 | print_address_numeric (section_base, 1, gdb_stdout); |
| 721 | printf_filtered ("\n"); |
| 722 | gdb_flush (gdb_stdout); |
| 723 | |
| 724 | /* Write the section header (location and size). */ |
| 725 | write_long (&header[0], (long)section_base); |
| 726 | write_long (&header[4], (long)section_size); |
| 727 | process_read_request (header, sizeof (header)); |
| 728 | |
| 729 | /* Read the section contents into a buffer, write it out, |
| 730 | then free the buffer. */ |
| 731 | buffer = (unsigned char *) xmalloc (section_size); |
| 732 | bfd_get_section_contents (abfd, s, buffer, 0, section_size); |
| 733 | process_read_request (buffer, section_size); |
| 734 | free (buffer); |
| 735 | } |
| 736 | } |
| 737 | |
| 738 | |
| 739 | /* When the ethernet is used as the console port on the Densan board, |
| 740 | we can use the "Rm" command to do a fast binary load. The format |
| 741 | of the download data is: |
| 742 | |
| 743 | number of sections (4 bytes) |
| 744 | starting address (4 bytes) |
| 745 | repeat for each section: |
| 746 | location address (4 bytes) |
| 747 | section size (4 bytes) |
| 748 | binary data |
| 749 | |
| 750 | The 4-byte fields are all in big-endian order. |
| 751 | |
| 752 | Using this command is tricky because we have to put the monitor |
| 753 | into a special funky "communications interface" mode, in which |
| 754 | it sends and receives packets of data along with the normal prompt. |
| 755 | */ |
| 756 | |
| 757 | static void |
| 758 | r3900_load (filename, from_tty) |
| 759 | char *filename; |
| 760 | int from_tty; |
| 761 | { |
| 762 | bfd *abfd; |
| 763 | unsigned int data_count = 0; |
| 764 | time_t start_time, end_time; /* for timing of download */ |
| 765 | int section_count = 0; |
| 766 | unsigned char buffer[8]; |
| 767 | |
| 768 | /* If we are not using the ethernet, use the normal monitor load, |
| 769 | which sends S-records over the serial link. */ |
| 770 | if (!ethernet) |
| 771 | { |
| 772 | orig_monitor_load (filename, from_tty); |
| 773 | return; |
| 774 | } |
| 775 | |
| 776 | /* Open the file. */ |
| 777 | if (filename == NULL || filename[0] == 0) |
| 778 | filename = get_exec_file (1); |
| 779 | abfd = bfd_openr (filename, 0); |
| 780 | if (!abfd) |
| 781 | error ("Unable to open file %s\n", filename); |
| 782 | if (bfd_check_format (abfd, bfd_object) == 0) |
| 783 | error ("File is not an object file\n"); |
| 784 | |
| 785 | /* Output the "vconsi" command to get the monitor in the communication |
| 786 | state where it will accept a load command. This will cause |
| 787 | the monitor to emit a packet before each prompt, so ignore the packet. */ |
| 788 | monitor_printf ("vconsi\r"); |
| 789 | ignore_packet (); |
| 790 | monitor_expect_prompt (NULL, 0); |
| 791 | |
| 792 | /* Output the "Rm" (load) command and respond to the subsequent "open" |
| 793 | packet by sending an ACK packet. */ |
| 794 | monitor_printf ("Rm\r"); |
| 795 | ignore_packet (); |
| 796 | send_packet ('a', "", 0, 0); |
| 797 | |
| 798 | /* Output the fast load header (number of sections and starting address). */ |
| 799 | bfd_map_over_sections ((bfd *) abfd, (section_map_func) count_section, |
| 800 | §ion_count); |
| 801 | write_long (&buffer[0], (long)section_count); |
| 802 | if (exec_bfd) |
| 803 | write_long (&buffer[4], (long)bfd_get_start_address (exec_bfd)); |
| 804 | else |
| 805 | write_long (&buffer[4], 0); |
| 806 | process_read_request (buffer, sizeof (buffer)); |
| 807 | |
| 808 | /* Output the section data. */ |
| 809 | start_time = time (NULL); |
| 810 | bfd_map_over_sections (abfd, (section_map_func) load_section, &data_count); |
| 811 | end_time = time (NULL); |
| 812 | |
| 813 | /* Acknowledge the close packet and put the monitor back into |
| 814 | "normal" mode so it won't send packets any more. */ |
| 815 | ignore_packet (); |
| 816 | send_packet ('a', "", 0, 0); |
| 817 | monitor_expect_prompt (NULL, 0); |
| 818 | monitor_printf ("vconsx\r"); |
| 819 | monitor_expect_prompt (NULL, 0); |
| 820 | |
| 821 | /* Print start address and download performance information. */ |
| 822 | printf_filtered ("Start address 0x%lx\n", (long)bfd_get_start_address (abfd)); |
| 823 | report_transfer_performance (data_count, start_time, end_time); |
| 824 | |
| 825 | /* Finally, make the PC point at the start address */ |
| 826 | if (exec_bfd) |
| 827 | write_pc (bfd_get_start_address (exec_bfd)); |
| 828 | |
| 829 | inferior_pid = 0; /* No process now */ |
| 830 | |
| 831 | /* This is necessary because many things were based on the PC at the |
| 832 | time that we attached to the monitor, which is no longer valid |
| 833 | now that we have loaded new code (and just changed the PC). |
| 834 | Another way to do this might be to call normal_stop, except that |
| 835 | the stack may not be valid, and things would get horribly |
| 836 | confused... */ |
| 837 | clear_symtab_users (); |
| 838 | } |
| 839 | |
| 840 | |
| 841 | /* Commands to send to the monitor when first connecting: |
| 842 | * The bare carriage return forces a prompt from the monitor |
| 843 | (monitor doesn't prompt immediately after a reset). |
| 844 | * The "vconsx" switches the monitor back to interactive mode |
| 845 | in case an aborted download had left it in packet mode. |
| 846 | * The "Xtr" command causes subsequent "t" (trace) commands to display |
| 847 | the general registers only. |
| 848 | * The "Xxr" command does the same thing for the "x" (examine |
| 849 | registers) command. |
| 850 | * The "bx" command clears all breakpoints. |
| 851 | */ |
| 852 | |
| 853 | static char *r3900_inits[] = {"\r", "vconsx\r", "Xtr\r", "Xxr\r", "bx\r", NULL}; |
| 854 | static char *dummy_inits[] = { NULL }; |
| 855 | |
| 856 | static struct target_ops r3900_ops; |
| 857 | static struct monitor_ops r3900_cmds; |
| 858 | |
| 859 | static void |
| 860 | r3900_open (args, from_tty) |
| 861 | char *args; |
| 862 | int from_tty; |
| 863 | { |
| 864 | char buf[64]; |
| 865 | int i; |
| 866 | |
| 867 | monitor_open (args, &r3900_cmds, from_tty); |
| 868 | |
| 869 | /* We have to handle sending the init strings ourselves, because |
| 870 | the first two strings we send (carriage returns) may not be echoed |
| 871 | by the monitor, but the rest will be. */ |
| 872 | monitor_printf_noecho ("\r\r"); |
| 873 | for (i = 0; r3900_inits[i] != NULL; i++) |
| 874 | { |
| 875 | monitor_printf (r3900_inits[i]); |
| 876 | monitor_expect_prompt (NULL, 0); |
| 877 | } |
| 878 | |
| 879 | /* Attempt to determine whether the console device is ethernet or serial. |
| 880 | This will tell us which kind of load to use (S-records over a serial |
| 881 | link, or the Densan fast binary multi-section format over the net). */ |
| 882 | |
| 883 | ethernet = 0; |
| 884 | monitor_printf ("v\r"); |
| 885 | if (monitor_expect ("console device :", NULL, 0) != -1) |
| 886 | if (monitor_expect ("\n", buf, sizeof (buf)) != -1) |
| 887 | if (strstr (buf, "ethernet") != NULL) |
| 888 | ethernet = 1; |
| 889 | monitor_expect_prompt (NULL, 0); |
| 890 | } |
| 891 | |
| 892 | void |
| 893 | _initialize_r3900_rom () |
| 894 | { |
| 895 | r3900_cmds.flags = MO_NO_ECHO_ON_OPEN | |
| 896 | MO_ADDR_BITS_REMOVE | |
| 897 | MO_CLR_BREAK_USES_ADDR | |
| 898 | MO_GETMEM_READ_SINGLE | |
| 899 | MO_PRINT_PROGRAM_OUTPUT; |
| 900 | |
| 901 | r3900_cmds.init = dummy_inits; |
| 902 | r3900_cmds.cont = "g\r"; |
| 903 | r3900_cmds.step = "t\r"; |
| 904 | r3900_cmds.set_break = "b %A\r"; /* COREADDR */ |
| 905 | r3900_cmds.clr_break = "b %A,0\r"; /* COREADDR */ |
| 906 | r3900_cmds.fill = "fx %A s %x %x\r"; /* COREADDR, len, val */ |
| 907 | |
| 908 | r3900_cmds.setmem.cmdb = "sx %A %x\r"; /* COREADDR, val */ |
| 909 | r3900_cmds.setmem.cmdw = "sh %A %x\r"; /* COREADDR, val */ |
| 910 | r3900_cmds.setmem.cmdl = "sw %A %x\r"; /* COREADDR, val */ |
| 911 | |
| 912 | r3900_cmds.getmem.cmdb = "sx %A\r"; /* COREADDR */ |
| 913 | r3900_cmds.getmem.cmdw = "sh %A\r"; /* COREADDR */ |
| 914 | r3900_cmds.getmem.cmdl = "sw %A\r"; /* COREADDR */ |
| 915 | r3900_cmds.getmem.resp_delim = " : "; |
| 916 | r3900_cmds.getmem.term = " "; |
| 917 | r3900_cmds.getmem.term_cmd = ".\r"; |
| 918 | |
| 919 | r3900_cmds.setreg.cmd = "x%s %x\r"; /* regname, val */ |
| 920 | |
| 921 | r3900_cmds.getreg.cmd = "x%s\r"; /* regname */ |
| 922 | r3900_cmds.getreg.resp_delim = "="; |
| 923 | r3900_cmds.getreg.term = " "; |
| 924 | r3900_cmds.getreg.term_cmd = ".\r"; |
| 925 | |
| 926 | r3900_cmds.dump_registers = "x\r"; |
| 927 | r3900_cmds.register_pattern = |
| 928 | "\\([a-zA-Z0-9_]+\\) *=\\([0-9a-f]+ [0-9a-f]+\\b\\)"; |
| 929 | r3900_cmds.supply_register = r3900_supply_register; |
| 930 | /* S-record download, via "keyboard port". */ |
| 931 | r3900_cmds.load = "r0\r"; |
| 932 | r3900_cmds.prompt = "#"; |
| 933 | r3900_cmds.line_term = "\r"; |
| 934 | r3900_cmds.target = &r3900_ops; |
| 935 | r3900_cmds.stopbits = SERIAL_1_STOPBITS; |
| 936 | r3900_cmds.regnames = r3900_regnames; |
| 937 | r3900_cmds.magic = MONITOR_OPS_MAGIC; |
| 938 | |
| 939 | init_monitor_ops (&r3900_ops); |
| 940 | |
| 941 | r3900_ops.to_shortname = "r3900"; |
| 942 | r3900_ops.to_longname = "R3900 monitor"; |
| 943 | r3900_ops.to_doc = "Debug using the DVE R3900 monitor.\n\ |
| 944 | Specify the serial device it is connected to (e.g. /dev/ttya)."; |
| 945 | r3900_ops.to_open = r3900_open; |
| 946 | |
| 947 | /* Override the functions to fetch and store registers. But save the |
| 948 | addresses of the default functions, because we will use those functions |
| 949 | for "normal" registers. */ |
| 950 | |
| 951 | orig_monitor_fetch_registers = r3900_ops.to_fetch_registers; |
| 952 | orig_monitor_store_registers = r3900_ops.to_store_registers; |
| 953 | r3900_ops.to_fetch_registers = r3900_fetch_registers; |
| 954 | r3900_ops.to_store_registers = r3900_store_registers; |
| 955 | |
| 956 | /* Override the load function, but save the address of the default |
| 957 | function to use when loading S-records over a serial link. */ |
| 958 | orig_monitor_load = r3900_ops.to_load; |
| 959 | r3900_ops.to_load = r3900_load; |
| 960 | |
| 961 | add_target (&r3900_ops); |
| 962 | } |