| 1 | /* Remote debugging interface for MIPS remote debugging protocol. |
| 2 | Copyright 1993, 1994, 1995 Free Software Foundation, Inc. |
| 3 | Contributed by Cygnus Support. Written by Ian Lance Taylor |
| 4 | <ian@cygnus.com>. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "inferior.h" |
| 24 | #include "bfd.h" |
| 25 | #include "symfile.h" |
| 26 | #include "wait.h" |
| 27 | #include "gdbcmd.h" |
| 28 | #include "gdbcore.h" |
| 29 | #include "serial.h" |
| 30 | #include "target.h" |
| 31 | #include "remote-utils.h" |
| 32 | |
| 33 | #include <signal.h> |
| 34 | #ifdef ANSI_PROTOTYPES |
| 35 | #include <stdarg.h> |
| 36 | #else |
| 37 | #include <varargs.h> |
| 38 | #endif |
| 39 | |
| 40 | extern char *mips_read_processor_type PARAMS ((void)); |
| 41 | |
| 42 | extern void mips_set_processor_type_command PARAMS ((char *, int)); |
| 43 | |
| 44 | \f |
| 45 | /* Prototypes for local functions. */ |
| 46 | |
| 47 | static int mips_readchar PARAMS ((int timeout)); |
| 48 | |
| 49 | static int mips_receive_header PARAMS ((unsigned char *hdr, int *pgarbage, |
| 50 | int ch, int timeout)); |
| 51 | |
| 52 | static int mips_receive_trailer PARAMS ((unsigned char *trlr, int *pgarbage, |
| 53 | int *pch, int timeout)); |
| 54 | |
| 55 | static int mips_cksum PARAMS ((const unsigned char *hdr, |
| 56 | const unsigned char *data, |
| 57 | int len)); |
| 58 | |
| 59 | static void mips_send_packet PARAMS ((const char *s, int get_ack)); |
| 60 | |
| 61 | static void mips_send_command PARAMS ((const char *cmd, int prompt)); |
| 62 | |
| 63 | static int mips_receive_packet PARAMS ((char *buff, int throw_error, |
| 64 | int timeout)); |
| 65 | |
| 66 | static int mips_request PARAMS ((int cmd, unsigned int addr, |
| 67 | unsigned int data, int *perr, int timeout, |
| 68 | char *buff)); |
| 69 | |
| 70 | static void mips_initialize PARAMS ((void)); |
| 71 | |
| 72 | static void mips_open PARAMS ((char *name, int from_tty)); |
| 73 | |
| 74 | static void pmon_open PARAMS ((char *name, int from_tty)); |
| 75 | |
| 76 | static void mips_close PARAMS ((int quitting)); |
| 77 | |
| 78 | static void mips_detach PARAMS ((char *args, int from_tty)); |
| 79 | |
| 80 | static void mips_resume PARAMS ((int pid, int step, |
| 81 | enum target_signal siggnal)); |
| 82 | |
| 83 | static int mips_wait PARAMS ((int pid, struct target_waitstatus *status)); |
| 84 | |
| 85 | static int pmon_wait PARAMS ((int pid, struct target_waitstatus *status)); |
| 86 | |
| 87 | static int mips_map_regno PARAMS ((int regno)); |
| 88 | |
| 89 | static void mips_fetch_registers PARAMS ((int regno)); |
| 90 | |
| 91 | static void mips_prepare_to_store PARAMS ((void)); |
| 92 | |
| 93 | static void mips_store_registers PARAMS ((int regno)); |
| 94 | |
| 95 | static int mips_fetch_word PARAMS ((CORE_ADDR addr)); |
| 96 | |
| 97 | static int mips_store_word PARAMS ((CORE_ADDR addr, int value, |
| 98 | char *old_contents)); |
| 99 | |
| 100 | static int mips_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, int len, |
| 101 | int write, struct target_ops *ignore)); |
| 102 | |
| 103 | static void mips_files_info PARAMS ((struct target_ops *ignore)); |
| 104 | |
| 105 | static void mips_create_inferior PARAMS ((char *execfile, char *args, |
| 106 | char **env)); |
| 107 | |
| 108 | static void mips_mourn_inferior PARAMS ((void)); |
| 109 | |
| 110 | static int pmon_makeb64 PARAMS ((unsigned long v, char *p, int n, int *chksum)); |
| 111 | |
| 112 | static int pmon_zeroset PARAMS ((int recsize, char **buff, int *amount, |
| 113 | unsigned int *chksum)); |
| 114 | |
| 115 | static int pmon_checkset PARAMS ((int recsize, char **buff, int *value)); |
| 116 | |
| 117 | static void pmon_make_fastrec PARAMS ((char **outbuf, unsigned char *inbuf, |
| 118 | int *inptr, int inamount, int *recsize, |
| 119 | unsigned int *csum, unsigned int *zerofill)); |
| 120 | |
| 121 | static int pmon_check_ack PARAMS ((void)); |
| 122 | |
| 123 | static void pmon_load_fast PARAMS ((char *file)); |
| 124 | |
| 125 | static void mips_load PARAMS ((char *file, int from_tty)); |
| 126 | |
| 127 | static int mips_make_srec PARAMS ((char *buffer, int type, CORE_ADDR memaddr, |
| 128 | unsigned char *myaddr, int len)); |
| 129 | |
| 130 | static int common_breakpoint PARAMS ((int cmd, CORE_ADDR addr, CORE_ADDR mask, |
| 131 | char *flags)); |
| 132 | |
| 133 | static void common_open PARAMS ((struct target_ops *ops, char *name, |
| 134 | int from_tty)); |
| 135 | /* Forward declarations. */ |
| 136 | extern struct target_ops mips_ops; |
| 137 | extern struct target_ops pmon_ops; |
| 138 | \f |
| 139 | /* The MIPS remote debugging interface is built on top of a simple |
| 140 | packet protocol. Each packet is organized as follows: |
| 141 | |
| 142 | SYN The first character is always a SYN (ASCII 026, or ^V). SYN |
| 143 | may not appear anywhere else in the packet. Any time a SYN is |
| 144 | seen, a new packet should be assumed to have begun. |
| 145 | |
| 146 | TYPE_LEN |
| 147 | This byte contains the upper five bits of the logical length |
| 148 | of the data section, plus a single bit indicating whether this |
| 149 | is a data packet or an acknowledgement. The documentation |
| 150 | indicates that this bit is 1 for a data packet, but the actual |
| 151 | board uses 1 for an acknowledgement. The value of the byte is |
| 152 | 0x40 + (ack ? 0x20 : 0) + (len >> 6) |
| 153 | (we always have 0 <= len < 1024). Acknowledgement packets do |
| 154 | not carry data, and must have a data length of 0. |
| 155 | |
| 156 | LEN1 This byte contains the lower six bits of the logical length of |
| 157 | the data section. The value is |
| 158 | 0x40 + (len & 0x3f) |
| 159 | |
| 160 | SEQ This byte contains the six bit sequence number of the packet. |
| 161 | The value is |
| 162 | 0x40 + seq |
| 163 | An acknowlegment packet contains the sequence number of the |
| 164 | packet being acknowledged plus 1 modulo 64. Data packets are |
| 165 | transmitted in sequence. There may only be one outstanding |
| 166 | unacknowledged data packet at a time. The sequence numbers |
| 167 | are independent in each direction. If an acknowledgement for |
| 168 | the previous packet is received (i.e., an acknowledgement with |
| 169 | the sequence number of the packet just sent) the packet just |
| 170 | sent should be retransmitted. If no acknowledgement is |
| 171 | received within a timeout period, the packet should be |
| 172 | retransmitted. This has an unfortunate failure condition on a |
| 173 | high-latency line, as a delayed acknowledgement may lead to an |
| 174 | endless series of duplicate packets. |
| 175 | |
| 176 | DATA The actual data bytes follow. The following characters are |
| 177 | escaped inline with DLE (ASCII 020, or ^P): |
| 178 | SYN (026) DLE S |
| 179 | DLE (020) DLE D |
| 180 | ^C (003) DLE C |
| 181 | ^S (023) DLE s |
| 182 | ^Q (021) DLE q |
| 183 | The additional DLE characters are not counted in the logical |
| 184 | length stored in the TYPE_LEN and LEN1 bytes. |
| 185 | |
| 186 | CSUM1 |
| 187 | CSUM2 |
| 188 | CSUM3 |
| 189 | These bytes contain an 18 bit checksum of the complete |
| 190 | contents of the packet excluding the SEQ byte and the |
| 191 | CSUM[123] bytes. The checksum is simply the twos complement |
| 192 | addition of all the bytes treated as unsigned characters. The |
| 193 | values of the checksum bytes are: |
| 194 | CSUM1: 0x40 + ((cksum >> 12) & 0x3f) |
| 195 | CSUM2: 0x40 + ((cksum >> 6) & 0x3f) |
| 196 | CSUM3: 0x40 + (cksum & 0x3f) |
| 197 | |
| 198 | It happens that the MIPS remote debugging protocol always |
| 199 | communicates with ASCII strings. Because of this, this |
| 200 | implementation doesn't bother to handle the DLE quoting mechanism, |
| 201 | since it will never be required. */ |
| 202 | |
| 203 | /* The SYN character which starts each packet. */ |
| 204 | #define SYN '\026' |
| 205 | |
| 206 | /* The 0x40 used to offset each packet (this value ensures that all of |
| 207 | the header and trailer bytes, other than SYN, are printable ASCII |
| 208 | characters). */ |
| 209 | #define HDR_OFFSET 0x40 |
| 210 | |
| 211 | /* The indices of the bytes in the packet header. */ |
| 212 | #define HDR_INDX_SYN 0 |
| 213 | #define HDR_INDX_TYPE_LEN 1 |
| 214 | #define HDR_INDX_LEN1 2 |
| 215 | #define HDR_INDX_SEQ 3 |
| 216 | #define HDR_LENGTH 4 |
| 217 | |
| 218 | /* The data/ack bit in the TYPE_LEN header byte. */ |
| 219 | #define TYPE_LEN_DA_BIT 0x20 |
| 220 | #define TYPE_LEN_DATA 0 |
| 221 | #define TYPE_LEN_ACK TYPE_LEN_DA_BIT |
| 222 | |
| 223 | /* How to compute the header bytes. */ |
| 224 | #define HDR_SET_SYN(data, len, seq) (SYN) |
| 225 | #define HDR_SET_TYPE_LEN(data, len, seq) \ |
| 226 | (HDR_OFFSET \ |
| 227 | + ((data) ? TYPE_LEN_DATA : TYPE_LEN_ACK) \ |
| 228 | + (((len) >> 6) & 0x1f)) |
| 229 | #define HDR_SET_LEN1(data, len, seq) (HDR_OFFSET + ((len) & 0x3f)) |
| 230 | #define HDR_SET_SEQ(data, len, seq) (HDR_OFFSET + (seq)) |
| 231 | |
| 232 | /* Check that a header byte is reasonable. */ |
| 233 | #define HDR_CHECK(ch) (((ch) & HDR_OFFSET) == HDR_OFFSET) |
| 234 | |
| 235 | /* Get data from the header. These macros evaluate their argument |
| 236 | multiple times. */ |
| 237 | #define HDR_IS_DATA(hdr) \ |
| 238 | (((hdr)[HDR_INDX_TYPE_LEN] & TYPE_LEN_DA_BIT) == TYPE_LEN_DATA) |
| 239 | #define HDR_GET_LEN(hdr) \ |
| 240 | ((((hdr)[HDR_INDX_TYPE_LEN] & 0x1f) << 6) + (((hdr)[HDR_INDX_LEN1] & 0x3f))) |
| 241 | #define HDR_GET_SEQ(hdr) ((hdr)[HDR_INDX_SEQ] & 0x3f) |
| 242 | |
| 243 | /* The maximum data length. */ |
| 244 | #define DATA_MAXLEN 1023 |
| 245 | |
| 246 | /* The trailer offset. */ |
| 247 | #define TRLR_OFFSET HDR_OFFSET |
| 248 | |
| 249 | /* The indices of the bytes in the packet trailer. */ |
| 250 | #define TRLR_INDX_CSUM1 0 |
| 251 | #define TRLR_INDX_CSUM2 1 |
| 252 | #define TRLR_INDX_CSUM3 2 |
| 253 | #define TRLR_LENGTH 3 |
| 254 | |
| 255 | /* How to compute the trailer bytes. */ |
| 256 | #define TRLR_SET_CSUM1(cksum) (TRLR_OFFSET + (((cksum) >> 12) & 0x3f)) |
| 257 | #define TRLR_SET_CSUM2(cksum) (TRLR_OFFSET + (((cksum) >> 6) & 0x3f)) |
| 258 | #define TRLR_SET_CSUM3(cksum) (TRLR_OFFSET + (((cksum) ) & 0x3f)) |
| 259 | |
| 260 | /* Check that a trailer byte is reasonable. */ |
| 261 | #define TRLR_CHECK(ch) (((ch) & TRLR_OFFSET) == TRLR_OFFSET) |
| 262 | |
| 263 | /* Get data from the trailer. This evaluates its argument multiple |
| 264 | times. */ |
| 265 | #define TRLR_GET_CKSUM(trlr) \ |
| 266 | ((((trlr)[TRLR_INDX_CSUM1] & 0x3f) << 12) \ |
| 267 | + (((trlr)[TRLR_INDX_CSUM2] & 0x3f) << 6) \ |
| 268 | + ((trlr)[TRLR_INDX_CSUM3] & 0x3f)) |
| 269 | |
| 270 | /* The sequence number modulos. */ |
| 271 | #define SEQ_MODULOS (64) |
| 272 | |
| 273 | enum mips_monitor_type { |
| 274 | /* IDT/SIM monitor being used: */ |
| 275 | MON_IDT, |
| 276 | /* PMON monitor being used: */ |
| 277 | MON_PMON, |
| 278 | /* Last and unused value, for sizing vectors, etc. */ |
| 279 | MON_LAST |
| 280 | }; |
| 281 | static enum mips_monitor_type mips_monitor = MON_LAST; |
| 282 | |
| 283 | /* The default monitor prompt text: */ |
| 284 | static char *mips_monitor_prompt = TARGET_MONITOR_PROMPT; |
| 285 | /* For the Cogent PMON world this is still not ideal. The default |
| 286 | prompt is "PMON> ", unfortunately the user can change the prompt |
| 287 | and the new prompt will survive over a power-cycle (EEPROM). This |
| 288 | means that the code should really force the monitor prompt to a |
| 289 | known value as the very first action, and that the |
| 290 | "mips_monitor_prompt" support is not needed... since the prompt |
| 291 | could be explicitly set to TARGET_MONITOR_PROMPT (even though it |
| 292 | may be the prompt for a different monitor). However, this will |
| 293 | require changing the mips_initialize reset sequence. (TODO) */ |
| 294 | |
| 295 | /* Set to 1 if the target is open. */ |
| 296 | static int mips_is_open; |
| 297 | |
| 298 | /* Currently active target description (if mips_is_open == 1) */ |
| 299 | static struct target_ops *current_ops; |
| 300 | |
| 301 | /* Set to 1 while the connection is being initialized. */ |
| 302 | static int mips_initializing; |
| 303 | |
| 304 | /* The next sequence number to send. */ |
| 305 | static unsigned int mips_send_seq; |
| 306 | |
| 307 | /* The next sequence number we expect to receive. */ |
| 308 | static unsigned int mips_receive_seq; |
| 309 | |
| 310 | /* The time to wait before retransmitting a packet, in seconds. */ |
| 311 | static int mips_retransmit_wait = 3; |
| 312 | |
| 313 | /* The number of times to try retransmitting a packet before giving up. */ |
| 314 | static int mips_send_retries = 10; |
| 315 | |
| 316 | /* The number of garbage characters to accept when looking for an |
| 317 | SYN for the next packet. */ |
| 318 | static int mips_syn_garbage = 1050; |
| 319 | |
| 320 | /* The time to wait for a packet, in seconds. */ |
| 321 | static int mips_receive_wait = 5; |
| 322 | |
| 323 | /* Set if we have sent a packet to the board but have not yet received |
| 324 | a reply. */ |
| 325 | static int mips_need_reply = 0; |
| 326 | |
| 327 | /* Handle used to access serial I/O stream. */ |
| 328 | static serial_t mips_desc; |
| 329 | |
| 330 | /* Counts the number of times the user tried to interrupt the target (usually |
| 331 | via ^C. */ |
| 332 | static int interrupt_count; |
| 333 | |
| 334 | /* If non-zero, means that the target is running. */ |
| 335 | static int mips_wait_flag = 0; |
| 336 | |
| 337 | /* If non-zero, monitor supports breakpoint commands. */ |
| 338 | static monitor_supports_breakpoints = 0; |
| 339 | |
| 340 | /* Data cache header. */ |
| 341 | |
| 342 | static DCACHE *mips_dcache; |
| 343 | |
| 344 | /* Non-zero means that we've just hit a read or write watchpoint */ |
| 345 | static int hit_watchpoint; |
| 346 | |
| 347 | /* Handle low-level error that we can't recover from. Note that just |
| 348 | error()ing out from target_wait or some such low-level place will cause |
| 349 | all hell to break loose--the rest of GDB will tend to get left in an |
| 350 | inconsistent state. */ |
| 351 | |
| 352 | static NORETURN void |
| 353 | #ifdef ANSI_PROTOTYPES |
| 354 | mips_error (char *string, ...) |
| 355 | #else |
| 356 | mips_error (va_alist) |
| 357 | va_dcl |
| 358 | #endif |
| 359 | { |
| 360 | va_list args; |
| 361 | |
| 362 | #ifdef ANSI_PROTOTYPES |
| 363 | va_start (args, string); |
| 364 | #else |
| 365 | char *string; |
| 366 | va_start (args); |
| 367 | string = va_arg (args, char *); |
| 368 | #endif |
| 369 | |
| 370 | target_terminal_ours (); |
| 371 | wrap_here(""); /* Force out any buffered output */ |
| 372 | gdb_flush (gdb_stdout); |
| 373 | if (error_pre_print) |
| 374 | fprintf_filtered (gdb_stderr, error_pre_print); |
| 375 | vfprintf_filtered (gdb_stderr, string, args); |
| 376 | fprintf_filtered (gdb_stderr, "\n"); |
| 377 | va_end (args); |
| 378 | gdb_flush (gdb_stderr); |
| 379 | |
| 380 | /* Clean up in such a way that mips_close won't try to talk to the |
| 381 | board (it almost surely won't work since we weren't able to talk to |
| 382 | it). */ |
| 383 | mips_is_open = 0; |
| 384 | SERIAL_CLOSE (mips_desc); |
| 385 | |
| 386 | printf_unfiltered ("Ending remote MIPS debugging.\n"); |
| 387 | target_mourn_inferior (); |
| 388 | |
| 389 | return_to_top_level (RETURN_ERROR); |
| 390 | } |
| 391 | |
| 392 | /* Wait until STRING shows up in mips_desc. Returns 1 if successful, else 0 if |
| 393 | timed out. */ |
| 394 | |
| 395 | int |
| 396 | mips_expect (string) |
| 397 | char *string; |
| 398 | { |
| 399 | char *p = string; |
| 400 | |
| 401 | immediate_quit = 1; |
| 402 | while (1) |
| 403 | { |
| 404 | int c; |
| 405 | |
| 406 | /* Must use SERIAL_READCHAR here cuz mips_readchar would get confused if we |
| 407 | were waiting for the mips_monitor_prompt... */ |
| 408 | |
| 409 | c = SERIAL_READCHAR (mips_desc, 2); |
| 410 | |
| 411 | if (c == SERIAL_TIMEOUT) |
| 412 | return 0; |
| 413 | |
| 414 | if (c == *p++) |
| 415 | { |
| 416 | if (*p == '\0') |
| 417 | { |
| 418 | immediate_quit = 0; |
| 419 | return 1; |
| 420 | } |
| 421 | } |
| 422 | else |
| 423 | { |
| 424 | p = string; |
| 425 | if (c == *p) |
| 426 | p++; |
| 427 | } |
| 428 | } |
| 429 | } |
| 430 | |
| 431 | /* Read the required number of characters into the given buffer (which |
| 432 | is assumed to be large enough). The only failure is a timeout. */ |
| 433 | int |
| 434 | mips_getstring (string, n) |
| 435 | char *string; |
| 436 | int n; |
| 437 | { |
| 438 | char *p = string; |
| 439 | int c; |
| 440 | |
| 441 | immediate_quit = 1; |
| 442 | while (n > 0) |
| 443 | { |
| 444 | c = SERIAL_READCHAR (mips_desc, 2); |
| 445 | |
| 446 | if (c == SERIAL_TIMEOUT) { |
| 447 | fprintf_unfiltered (stderr, "Failed to read %d characters from target (TIMEOUT)\n", n); |
| 448 | return 0; |
| 449 | } |
| 450 | |
| 451 | *p++ = c; |
| 452 | n--; |
| 453 | } |
| 454 | |
| 455 | return 1; |
| 456 | } |
| 457 | |
| 458 | /* Read a character from the remote, aborting on error. Returns |
| 459 | SERIAL_TIMEOUT on timeout (since that's what SERIAL_READCHAR |
| 460 | returns). FIXME: If we see the string mips_monitor_prompt from |
| 461 | the board, then we are debugging on the main console port, and we |
| 462 | have somehow dropped out of remote debugging mode. In this case, |
| 463 | we automatically go back in to remote debugging mode. This is a |
| 464 | hack, put in because I can't find any way for a program running on |
| 465 | the remote board to terminate without also ending remote debugging |
| 466 | mode. I assume users won't have any trouble with this; for one |
| 467 | thing, the IDT documentation generally assumes that the remote |
| 468 | debugging port is not the console port. This is, however, very |
| 469 | convenient for DejaGnu when you only have one connected serial |
| 470 | port. */ |
| 471 | |
| 472 | static int |
| 473 | mips_readchar (timeout) |
| 474 | int timeout; |
| 475 | { |
| 476 | int ch; |
| 477 | static int state = 0; |
| 478 | static int mips_monitor_prompt_len = -1; |
| 479 | |
| 480 | /* NASTY, since we assume that the prompt does not change after the |
| 481 | first mips_readchar call: */ |
| 482 | if (mips_monitor_prompt_len = -1) |
| 483 | mips_monitor_prompt_len = strlen(mips_monitor_prompt); |
| 484 | |
| 485 | #ifdef MAINTENANCE_CMDS |
| 486 | { |
| 487 | int i; |
| 488 | |
| 489 | i = timeout; |
| 490 | if (i == -1 && watchdog > 0) |
| 491 | i = watchdog; |
| 492 | } |
| 493 | #endif |
| 494 | |
| 495 | if (state == mips_monitor_prompt_len) |
| 496 | timeout = 1; |
| 497 | ch = SERIAL_READCHAR (mips_desc, timeout); |
| 498 | #ifdef MAINTENANCE_CMDS |
| 499 | if (ch == SERIAL_TIMEOUT && timeout == -1) /* Watchdog went off */ |
| 500 | { |
| 501 | target_mourn_inferior (); |
| 502 | error ("Watchdog has expired. Target detached.\n"); |
| 503 | } |
| 504 | #endif |
| 505 | if (ch == SERIAL_EOF) |
| 506 | mips_error ("End of file from remote"); |
| 507 | if (ch == SERIAL_ERROR) |
| 508 | mips_error ("Error reading from remote: %s", safe_strerror (errno)); |
| 509 | if (remote_debug > 1) |
| 510 | { |
| 511 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 512 | target_wait, and I think this might be called from there. */ |
| 513 | if (ch != SERIAL_TIMEOUT) |
| 514 | printf_unfiltered ("Read '%c' %d 0x%x\n", ch, ch, ch); |
| 515 | else |
| 516 | printf_unfiltered ("Timed out in read\n"); |
| 517 | } |
| 518 | |
| 519 | /* If we have seen mips_monitor_prompt and we either time out, or |
| 520 | we see a @ (which was echoed from a packet we sent), reset the |
| 521 | board as described above. The first character in a packet after |
| 522 | the SYN (which is not echoed) is always an @ unless the packet is |
| 523 | more than 64 characters long, which ours never are. */ |
| 524 | if ((ch == SERIAL_TIMEOUT || ch == '@') |
| 525 | && state == mips_monitor_prompt_len |
| 526 | && ! mips_initializing) |
| 527 | { |
| 528 | if (remote_debug > 0) |
| 529 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 530 | target_wait, and I think this might be called from there. */ |
| 531 | printf_unfiltered ("Reinitializing MIPS debugging mode\n"); |
| 532 | |
| 533 | mips_need_reply = 0; |
| 534 | mips_initialize (); |
| 535 | |
| 536 | state = 0; |
| 537 | |
| 538 | /* At this point, about the only thing we can do is abort the command |
| 539 | in progress and get back to command level as quickly as possible. */ |
| 540 | |
| 541 | error ("Remote board reset, debug protocol re-initialized."); |
| 542 | } |
| 543 | |
| 544 | if (ch == mips_monitor_prompt[state]) |
| 545 | ++state; |
| 546 | else |
| 547 | state = 0; |
| 548 | |
| 549 | return ch; |
| 550 | } |
| 551 | |
| 552 | /* Get a packet header, putting the data in the supplied buffer. |
| 553 | PGARBAGE is a pointer to the number of garbage characters received |
| 554 | so far. CH is the last character received. Returns 0 for success, |
| 555 | or -1 for timeout. */ |
| 556 | |
| 557 | static int |
| 558 | mips_receive_header (hdr, pgarbage, ch, timeout) |
| 559 | unsigned char *hdr; |
| 560 | int *pgarbage; |
| 561 | int ch; |
| 562 | int timeout; |
| 563 | { |
| 564 | int i; |
| 565 | |
| 566 | while (1) |
| 567 | { |
| 568 | /* Wait for a SYN. mips_syn_garbage is intended to prevent |
| 569 | sitting here indefinitely if the board sends us one garbage |
| 570 | character per second. ch may already have a value from the |
| 571 | last time through the loop. */ |
| 572 | while (ch != SYN) |
| 573 | { |
| 574 | ch = mips_readchar (timeout); |
| 575 | if (ch == SERIAL_TIMEOUT) |
| 576 | return -1; |
| 577 | if (ch != SYN) |
| 578 | { |
| 579 | /* Printing the character here lets the user of gdb see |
| 580 | what the program is outputting, if the debugging is |
| 581 | being done on the console port. Don't use _filtered; |
| 582 | we can't deal with a QUIT out of target_wait. */ |
| 583 | if (! mips_initializing || remote_debug > 0) |
| 584 | { |
| 585 | /* Note that the host's idea of newline may not |
| 586 | correspond to the target's idea, so recognize |
| 587 | newline by its actual ASCII code, but write it |
| 588 | out using the \n notation. */ |
| 589 | if (ch < 0x20 && ch != '\012') |
| 590 | { |
| 591 | putchar_unfiltered ('^'); |
| 592 | putchar_unfiltered (ch + 0x40); |
| 593 | } |
| 594 | else if (ch == '\012') |
| 595 | putchar_unfiltered ('\n'); |
| 596 | else |
| 597 | putchar_unfiltered (ch); |
| 598 | gdb_flush (gdb_stdout); |
| 599 | } |
| 600 | |
| 601 | ++*pgarbage; |
| 602 | if (mips_syn_garbage > 0 |
| 603 | && *pgarbage > mips_syn_garbage) |
| 604 | mips_error ("Debug protocol failure: more than %d characters before a sync.", |
| 605 | mips_syn_garbage); |
| 606 | } |
| 607 | } |
| 608 | |
| 609 | /* Get the packet header following the SYN. */ |
| 610 | for (i = 1; i < HDR_LENGTH; i++) |
| 611 | { |
| 612 | ch = mips_readchar (timeout); |
| 613 | if (ch == SERIAL_TIMEOUT) |
| 614 | return -1; |
| 615 | /* Make sure this is a header byte. */ |
| 616 | if (ch == SYN || ! HDR_CHECK (ch)) |
| 617 | break; |
| 618 | |
| 619 | hdr[i] = ch; |
| 620 | } |
| 621 | |
| 622 | /* If we got the complete header, we can return. Otherwise we |
| 623 | loop around and keep looking for SYN. */ |
| 624 | if (i >= HDR_LENGTH) |
| 625 | return 0; |
| 626 | } |
| 627 | } |
| 628 | |
| 629 | /* Get a packet header, putting the data in the supplied buffer. |
| 630 | PGARBAGE is a pointer to the number of garbage characters received |
| 631 | so far. The last character read is returned in *PCH. Returns 0 |
| 632 | for success, -1 for timeout, -2 for error. */ |
| 633 | |
| 634 | static int |
| 635 | mips_receive_trailer (trlr, pgarbage, pch, timeout) |
| 636 | unsigned char *trlr; |
| 637 | int *pgarbage; |
| 638 | int *pch; |
| 639 | int timeout; |
| 640 | { |
| 641 | int i; |
| 642 | int ch; |
| 643 | |
| 644 | for (i = 0; i < TRLR_LENGTH; i++) |
| 645 | { |
| 646 | ch = mips_readchar (timeout); |
| 647 | *pch = ch; |
| 648 | if (ch == SERIAL_TIMEOUT) |
| 649 | return -1; |
| 650 | if (! TRLR_CHECK (ch)) |
| 651 | return -2; |
| 652 | trlr[i] = ch; |
| 653 | } |
| 654 | return 0; |
| 655 | } |
| 656 | |
| 657 | /* Get the checksum of a packet. HDR points to the packet header. |
| 658 | DATA points to the packet data. LEN is the length of DATA. */ |
| 659 | |
| 660 | static int |
| 661 | mips_cksum (hdr, data, len) |
| 662 | const unsigned char *hdr; |
| 663 | const unsigned char *data; |
| 664 | int len; |
| 665 | { |
| 666 | register const unsigned char *p; |
| 667 | register int c; |
| 668 | register int cksum; |
| 669 | |
| 670 | cksum = 0; |
| 671 | |
| 672 | /* The initial SYN is not included in the checksum. */ |
| 673 | c = HDR_LENGTH - 1; |
| 674 | p = hdr + 1; |
| 675 | while (c-- != 0) |
| 676 | cksum += *p++; |
| 677 | |
| 678 | c = len; |
| 679 | p = data; |
| 680 | while (c-- != 0) |
| 681 | cksum += *p++; |
| 682 | |
| 683 | return cksum; |
| 684 | } |
| 685 | |
| 686 | /* Send a packet containing the given ASCII string. */ |
| 687 | |
| 688 | static void |
| 689 | mips_send_packet (s, get_ack) |
| 690 | const char *s; |
| 691 | int get_ack; |
| 692 | { |
| 693 | unsigned int len; |
| 694 | unsigned char *packet; |
| 695 | register int cksum; |
| 696 | int try; |
| 697 | |
| 698 | len = strlen (s); |
| 699 | if (len > DATA_MAXLEN) |
| 700 | mips_error ("MIPS protocol data packet too long: %s", s); |
| 701 | |
| 702 | packet = (unsigned char *) alloca (HDR_LENGTH + len + TRLR_LENGTH + 1); |
| 703 | |
| 704 | packet[HDR_INDX_SYN] = HDR_SET_SYN (1, len, mips_send_seq); |
| 705 | packet[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (1, len, mips_send_seq); |
| 706 | packet[HDR_INDX_LEN1] = HDR_SET_LEN1 (1, len, mips_send_seq); |
| 707 | packet[HDR_INDX_SEQ] = HDR_SET_SEQ (1, len, mips_send_seq); |
| 708 | |
| 709 | memcpy (packet + HDR_LENGTH, s, len); |
| 710 | |
| 711 | cksum = mips_cksum (packet, packet + HDR_LENGTH, len); |
| 712 | packet[HDR_LENGTH + len + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum); |
| 713 | packet[HDR_LENGTH + len + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum); |
| 714 | packet[HDR_LENGTH + len + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum); |
| 715 | |
| 716 | /* Increment the sequence number. This will set mips_send_seq to |
| 717 | the sequence number we expect in the acknowledgement. */ |
| 718 | mips_send_seq = (mips_send_seq + 1) % SEQ_MODULOS; |
| 719 | |
| 720 | /* We can only have one outstanding data packet, so we just wait for |
| 721 | the acknowledgement here. Keep retransmitting the packet until |
| 722 | we get one, or until we've tried too many times. */ |
| 723 | for (try = 0; try < mips_send_retries; try++) |
| 724 | { |
| 725 | int garbage; |
| 726 | int ch; |
| 727 | |
| 728 | if (remote_debug > 0) |
| 729 | { |
| 730 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 731 | target_wait, and I think this might be called from there. */ |
| 732 | packet[HDR_LENGTH + len + TRLR_LENGTH] = '\0'; |
| 733 | printf_unfiltered ("Writing \"%s\"\n", packet + 1); |
| 734 | } |
| 735 | |
| 736 | if (SERIAL_WRITE (mips_desc, packet, |
| 737 | HDR_LENGTH + len + TRLR_LENGTH) != 0) |
| 738 | mips_error ("write to target failed: %s", safe_strerror (errno)); |
| 739 | |
| 740 | if (! get_ack) |
| 741 | return; |
| 742 | |
| 743 | garbage = 0; |
| 744 | ch = 0; |
| 745 | while (1) |
| 746 | { |
| 747 | unsigned char hdr[HDR_LENGTH + 1]; |
| 748 | unsigned char trlr[TRLR_LENGTH + 1]; |
| 749 | int err; |
| 750 | int seq; |
| 751 | |
| 752 | /* Get the packet header. If we time out, resend the data |
| 753 | packet. */ |
| 754 | err = mips_receive_header (hdr, &garbage, ch, mips_retransmit_wait); |
| 755 | if (err != 0) |
| 756 | break; |
| 757 | |
| 758 | ch = 0; |
| 759 | |
| 760 | /* If we get a data packet, assume it is a duplicate and |
| 761 | ignore it. FIXME: If the acknowledgement is lost, this |
| 762 | data packet may be the packet the remote sends after the |
| 763 | acknowledgement. */ |
| 764 | if (HDR_IS_DATA (hdr)) { |
| 765 | int i; |
| 766 | |
| 767 | /* Ignore any errors raised whilst attempting to ignore |
| 768 | packet. */ |
| 769 | |
| 770 | len = HDR_GET_LEN (hdr); |
| 771 | |
| 772 | for (i = 0; i < len; i++) |
| 773 | { |
| 774 | int rch; |
| 775 | |
| 776 | rch = mips_readchar (2); |
| 777 | if (rch == SYN) |
| 778 | { |
| 779 | ch = SYN; |
| 780 | break; |
| 781 | } |
| 782 | if (rch == SERIAL_TIMEOUT) |
| 783 | break; |
| 784 | /* ignore the character */ |
| 785 | } |
| 786 | |
| 787 | if (i == len) |
| 788 | (void) mips_receive_trailer (trlr, &garbage, &ch, 2); |
| 789 | |
| 790 | /* We don't bother checking the checksum, or providing an |
| 791 | ACK to the packet. */ |
| 792 | continue; |
| 793 | } |
| 794 | |
| 795 | /* If the length is not 0, this is a garbled packet. */ |
| 796 | if (HDR_GET_LEN (hdr) != 0) |
| 797 | continue; |
| 798 | |
| 799 | /* Get the packet trailer. */ |
| 800 | err = mips_receive_trailer (trlr, &garbage, &ch, |
| 801 | mips_retransmit_wait); |
| 802 | |
| 803 | /* If we timed out, resend the data packet. */ |
| 804 | if (err == -1) |
| 805 | break; |
| 806 | |
| 807 | /* If we got a bad character, reread the header. */ |
| 808 | if (err != 0) |
| 809 | continue; |
| 810 | |
| 811 | /* If the checksum does not match the trailer checksum, this |
| 812 | is a bad packet; ignore it. */ |
| 813 | if (mips_cksum (hdr, (unsigned char *) NULL, 0) |
| 814 | != TRLR_GET_CKSUM (trlr)) |
| 815 | continue; |
| 816 | |
| 817 | if (remote_debug > 0) |
| 818 | { |
| 819 | hdr[HDR_LENGTH] = '\0'; |
| 820 | trlr[TRLR_LENGTH] = '\0'; |
| 821 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 822 | target_wait, and I think this might be called from there. */ |
| 823 | printf_unfiltered ("Got ack %d \"%s%s\"\n", |
| 824 | HDR_GET_SEQ (hdr), hdr + 1, trlr); |
| 825 | } |
| 826 | |
| 827 | /* If this ack is for the current packet, we're done. */ |
| 828 | seq = HDR_GET_SEQ (hdr); |
| 829 | if (seq == mips_send_seq) |
| 830 | return; |
| 831 | |
| 832 | /* If this ack is for the last packet, resend the current |
| 833 | packet. */ |
| 834 | if ((seq + 1) % SEQ_MODULOS == mips_send_seq) |
| 835 | break; |
| 836 | |
| 837 | /* Otherwise this is a bad ack; ignore it. Increment the |
| 838 | garbage count to ensure that we do not stay in this loop |
| 839 | forever. */ |
| 840 | ++garbage; |
| 841 | } |
| 842 | } |
| 843 | |
| 844 | mips_error ("Remote did not acknowledge packet"); |
| 845 | } |
| 846 | |
| 847 | /* Receive and acknowledge a packet, returning the data in BUFF (which |
| 848 | should be DATA_MAXLEN + 1 bytes). The protocol documentation |
| 849 | implies that only the sender retransmits packets, so this code just |
| 850 | waits silently for a packet. It returns the length of the received |
| 851 | packet. If THROW_ERROR is nonzero, call error() on errors. If not, |
| 852 | don't print an error message and return -1. */ |
| 853 | |
| 854 | static int |
| 855 | mips_receive_packet (buff, throw_error, timeout) |
| 856 | char *buff; |
| 857 | int throw_error; |
| 858 | int timeout; |
| 859 | { |
| 860 | int ch; |
| 861 | int garbage; |
| 862 | int len; |
| 863 | unsigned char ack[HDR_LENGTH + TRLR_LENGTH + 1]; |
| 864 | int cksum; |
| 865 | |
| 866 | ch = 0; |
| 867 | garbage = 0; |
| 868 | while (1) |
| 869 | { |
| 870 | unsigned char hdr[HDR_LENGTH]; |
| 871 | unsigned char trlr[TRLR_LENGTH]; |
| 872 | int i; |
| 873 | int err; |
| 874 | |
| 875 | if (mips_receive_header (hdr, &garbage, ch, timeout) != 0) |
| 876 | { |
| 877 | if (throw_error) |
| 878 | mips_error ("Timed out waiting for remote packet"); |
| 879 | else |
| 880 | return -1; |
| 881 | } |
| 882 | |
| 883 | ch = 0; |
| 884 | |
| 885 | /* An acknowledgement is probably a duplicate; ignore it. */ |
| 886 | if (! HDR_IS_DATA (hdr)) |
| 887 | { |
| 888 | len = HDR_GET_LEN (hdr); |
| 889 | /* Check if the length is valid for an ACK, we may aswell |
| 890 | try and read the remainder of the packet: */ |
| 891 | if (len == 0) |
| 892 | { |
| 893 | /* Ignore the error condition, since we are going to |
| 894 | ignore the packet anyway. */ |
| 895 | (void) mips_receive_trailer (trlr, &garbage, &ch, timeout); |
| 896 | } |
| 897 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 898 | target_wait, and I think this might be called from there. */ |
| 899 | if (remote_debug > 0) |
| 900 | printf_unfiltered ("Ignoring unexpected ACK\n"); |
| 901 | continue; |
| 902 | } |
| 903 | |
| 904 | len = HDR_GET_LEN (hdr); |
| 905 | for (i = 0; i < len; i++) |
| 906 | { |
| 907 | int rch; |
| 908 | |
| 909 | rch = mips_readchar (timeout); |
| 910 | if (rch == SYN) |
| 911 | { |
| 912 | ch = SYN; |
| 913 | break; |
| 914 | } |
| 915 | if (rch == SERIAL_TIMEOUT) |
| 916 | { |
| 917 | if (throw_error) |
| 918 | mips_error ("Timed out waiting for remote packet"); |
| 919 | else |
| 920 | return -1; |
| 921 | } |
| 922 | buff[i] = rch; |
| 923 | } |
| 924 | |
| 925 | if (i < len) |
| 926 | { |
| 927 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 928 | target_wait, and I think this might be called from there. */ |
| 929 | if (remote_debug > 0) |
| 930 | printf_unfiltered ("Got new SYN after %d chars (wanted %d)\n", |
| 931 | i, len); |
| 932 | continue; |
| 933 | } |
| 934 | |
| 935 | err = mips_receive_trailer (trlr, &garbage, &ch, timeout); |
| 936 | if (err == -1) |
| 937 | { |
| 938 | if (throw_error) |
| 939 | mips_error ("Timed out waiting for packet"); |
| 940 | else |
| 941 | return -1; |
| 942 | } |
| 943 | if (err == -2) |
| 944 | { |
| 945 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 946 | target_wait, and I think this might be called from there. */ |
| 947 | if (remote_debug > 0) |
| 948 | printf_unfiltered ("Got SYN when wanted trailer\n"); |
| 949 | continue; |
| 950 | } |
| 951 | |
| 952 | /* If this is the wrong sequence number, ignore it. */ |
| 953 | if (HDR_GET_SEQ (hdr) != mips_receive_seq) |
| 954 | { |
| 955 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 956 | target_wait, and I think this might be called from there. */ |
| 957 | if (remote_debug > 0) |
| 958 | printf_unfiltered ("Ignoring sequence number %d (want %d)\n", |
| 959 | HDR_GET_SEQ (hdr), mips_receive_seq); |
| 960 | continue; |
| 961 | } |
| 962 | |
| 963 | if (mips_cksum (hdr, buff, len) == TRLR_GET_CKSUM (trlr)) |
| 964 | break; |
| 965 | |
| 966 | if (remote_debug > 0) |
| 967 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 968 | target_wait, and I think this might be called from there. */ |
| 969 | printf_unfiltered ("Bad checksum; data %d, trailer %d\n", |
| 970 | mips_cksum (hdr, buff, len), |
| 971 | TRLR_GET_CKSUM (trlr)); |
| 972 | |
| 973 | /* The checksum failed. Send an acknowledgement for the |
| 974 | previous packet to tell the remote to resend the packet. */ |
| 975 | ack[HDR_INDX_SYN] = HDR_SET_SYN (0, 0, mips_receive_seq); |
| 976 | ack[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq); |
| 977 | ack[HDR_INDX_LEN1] = HDR_SET_LEN1 (0, 0, mips_receive_seq); |
| 978 | ack[HDR_INDX_SEQ] = HDR_SET_SEQ (0, 0, mips_receive_seq); |
| 979 | |
| 980 | cksum = mips_cksum (ack, (unsigned char *) NULL, 0); |
| 981 | |
| 982 | ack[HDR_LENGTH + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum); |
| 983 | ack[HDR_LENGTH + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum); |
| 984 | ack[HDR_LENGTH + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum); |
| 985 | |
| 986 | if (remote_debug > 0) |
| 987 | { |
| 988 | ack[HDR_LENGTH + TRLR_LENGTH] = '\0'; |
| 989 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 990 | target_wait, and I think this might be called from there. */ |
| 991 | printf_unfiltered ("Writing ack %d \"%s\"\n", mips_receive_seq, |
| 992 | ack + 1); |
| 993 | } |
| 994 | |
| 995 | if (SERIAL_WRITE (mips_desc, ack, HDR_LENGTH + TRLR_LENGTH) != 0) |
| 996 | { |
| 997 | if (throw_error) |
| 998 | mips_error ("write to target failed: %s", safe_strerror (errno)); |
| 999 | else |
| 1000 | return -1; |
| 1001 | } |
| 1002 | } |
| 1003 | |
| 1004 | if (remote_debug > 0) |
| 1005 | { |
| 1006 | buff[len] = '\0'; |
| 1007 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 1008 | target_wait, and I think this might be called from there. */ |
| 1009 | printf_unfiltered ("Got packet \"%s\"\n", buff); |
| 1010 | } |
| 1011 | |
| 1012 | /* We got the packet. Send an acknowledgement. */ |
| 1013 | mips_receive_seq = (mips_receive_seq + 1) % SEQ_MODULOS; |
| 1014 | |
| 1015 | ack[HDR_INDX_SYN] = HDR_SET_SYN (0, 0, mips_receive_seq); |
| 1016 | ack[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq); |
| 1017 | ack[HDR_INDX_LEN1] = HDR_SET_LEN1 (0, 0, mips_receive_seq); |
| 1018 | ack[HDR_INDX_SEQ] = HDR_SET_SEQ (0, 0, mips_receive_seq); |
| 1019 | |
| 1020 | cksum = mips_cksum (ack, (unsigned char *) NULL, 0); |
| 1021 | |
| 1022 | ack[HDR_LENGTH + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum); |
| 1023 | ack[HDR_LENGTH + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum); |
| 1024 | ack[HDR_LENGTH + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum); |
| 1025 | |
| 1026 | if (remote_debug > 0) |
| 1027 | { |
| 1028 | ack[HDR_LENGTH + TRLR_LENGTH] = '\0'; |
| 1029 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 1030 | target_wait, and I think this might be called from there. */ |
| 1031 | printf_unfiltered ("Writing ack %d \"%s\"\n", mips_receive_seq, |
| 1032 | ack + 1); |
| 1033 | } |
| 1034 | |
| 1035 | if (SERIAL_WRITE (mips_desc, ack, HDR_LENGTH + TRLR_LENGTH) != 0) |
| 1036 | { |
| 1037 | if (throw_error) |
| 1038 | mips_error ("write to target failed: %s", safe_strerror (errno)); |
| 1039 | else |
| 1040 | return -1; |
| 1041 | } |
| 1042 | |
| 1043 | return len; |
| 1044 | } |
| 1045 | \f |
| 1046 | /* Optionally send a request to the remote system and optionally wait |
| 1047 | for the reply. This implements the remote debugging protocol, |
| 1048 | which is built on top of the packet protocol defined above. Each |
| 1049 | request has an ADDR argument and a DATA argument. The following |
| 1050 | requests are defined: |
| 1051 | |
| 1052 | \0 don't send a request; just wait for a reply |
| 1053 | i read word from instruction space at ADDR |
| 1054 | d read word from data space at ADDR |
| 1055 | I write DATA to instruction space at ADDR |
| 1056 | D write DATA to data space at ADDR |
| 1057 | r read register number ADDR |
| 1058 | R set register number ADDR to value DATA |
| 1059 | c continue execution (if ADDR != 1, set pc to ADDR) |
| 1060 | s single step (if ADDR != 1, set pc to ADDR) |
| 1061 | |
| 1062 | The read requests return the value requested. The write requests |
| 1063 | return the previous value in the changed location. The execution |
| 1064 | requests return a UNIX wait value (the approximate signal which |
| 1065 | caused execution to stop is in the upper eight bits). |
| 1066 | |
| 1067 | If PERR is not NULL, this function waits for a reply. If an error |
| 1068 | occurs, it sets *PERR to 1 and sets errno according to what the |
| 1069 | target board reports. */ |
| 1070 | |
| 1071 | static int |
| 1072 | mips_request (cmd, addr, data, perr, timeout, buff) |
| 1073 | int cmd; |
| 1074 | unsigned int addr; |
| 1075 | unsigned int data; |
| 1076 | int *perr; |
| 1077 | int timeout; |
| 1078 | char *buff; |
| 1079 | { |
| 1080 | char myBuff[DATA_MAXLEN + 1]; |
| 1081 | int len; |
| 1082 | int rpid; |
| 1083 | char rcmd; |
| 1084 | int rerrflg; |
| 1085 | int rresponse; |
| 1086 | |
| 1087 | if (buff == (char *) NULL) |
| 1088 | buff = myBuff; |
| 1089 | |
| 1090 | if (cmd != '\0') |
| 1091 | { |
| 1092 | if (mips_need_reply) |
| 1093 | fatal ("mips_request: Trying to send command before reply"); |
| 1094 | sprintf (buff, "0x0 %c 0x%x 0x%x", cmd, addr, data); |
| 1095 | mips_send_packet (buff, 1); |
| 1096 | mips_need_reply = 1; |
| 1097 | } |
| 1098 | |
| 1099 | if (perr == (int *) NULL) |
| 1100 | return 0; |
| 1101 | |
| 1102 | if (! mips_need_reply) |
| 1103 | fatal ("mips_request: Trying to get reply before command"); |
| 1104 | |
| 1105 | mips_need_reply = 0; |
| 1106 | |
| 1107 | len = mips_receive_packet (buff, 1, timeout); |
| 1108 | buff[len] = '\0'; |
| 1109 | |
| 1110 | if (sscanf (buff, "0x%x %c 0x%x 0x%x", |
| 1111 | &rpid, &rcmd, &rerrflg, &rresponse) != 4 |
| 1112 | || (cmd != '\0' && rcmd != cmd)) |
| 1113 | mips_error ("Bad response from remote board"); |
| 1114 | |
| 1115 | if (rerrflg != 0) |
| 1116 | { |
| 1117 | *perr = 1; |
| 1118 | |
| 1119 | /* FIXME: This will returns MIPS errno numbers, which may or may |
| 1120 | not be the same as errno values used on other systems. If |
| 1121 | they stick to common errno values, they will be the same, but |
| 1122 | if they don't, they must be translated. */ |
| 1123 | errno = rresponse; |
| 1124 | |
| 1125 | return 0; |
| 1126 | } |
| 1127 | |
| 1128 | *perr = 0; |
| 1129 | return rresponse; |
| 1130 | } |
| 1131 | |
| 1132 | static void |
| 1133 | mips_initialize_cleanups (arg) |
| 1134 | PTR arg; |
| 1135 | { |
| 1136 | mips_initializing = 0; |
| 1137 | } |
| 1138 | |
| 1139 | static void |
| 1140 | mips_send_command (cmd, prompt) |
| 1141 | const char *cmd; |
| 1142 | int prompt; |
| 1143 | { |
| 1144 | SERIAL_WRITE (mips_desc, cmd, strlen(cmd)); |
| 1145 | mips_expect (cmd); |
| 1146 | mips_expect ("\012"); |
| 1147 | if (prompt) |
| 1148 | mips_expect (mips_monitor_prompt); |
| 1149 | } |
| 1150 | |
| 1151 | /* Enter remote (dbx) debug mode: */ |
| 1152 | static void |
| 1153 | mips_enter_debug () |
| 1154 | { |
| 1155 | /* Reset the sequence numbers, ready for the new debug sequence: */ |
| 1156 | mips_send_seq = 0; |
| 1157 | mips_receive_seq = 0; |
| 1158 | |
| 1159 | if (mips_monitor == MON_PMON) |
| 1160 | mips_send_command ("debug\015", 0); |
| 1161 | else /* assume IDT monitor by default */ |
| 1162 | mips_send_command ("db tty0\015", 0); |
| 1163 | |
| 1164 | SERIAL_WRITE (mips_desc, "\015", sizeof "\015" - 1); |
| 1165 | |
| 1166 | /* We don't need to absorb any spurious characters here, since the |
| 1167 | mips_receive_header will eat up a reasonable number of characters |
| 1168 | whilst looking for the SYN, however this avoids the "garbage" |
| 1169 | being displayed to the user. */ |
| 1170 | if (mips_monitor == MON_PMON) |
| 1171 | mips_expect ("\015"); |
| 1172 | |
| 1173 | { |
| 1174 | char buff[DATA_MAXLEN + 1]; |
| 1175 | if (mips_receive_packet (buff, 1, 3) < 0) |
| 1176 | mips_error ("Failed to initialize (didn't receive packet)."); |
| 1177 | } |
| 1178 | } |
| 1179 | |
| 1180 | /* Exit remote (dbx) debug mode, returning to the monitor prompt: */ |
| 1181 | static int |
| 1182 | mips_exit_debug () |
| 1183 | { |
| 1184 | int err; |
| 1185 | |
| 1186 | mips_request ('x', (unsigned int) 0, (unsigned int) 0, &err, |
| 1187 | mips_receive_wait, NULL); |
| 1188 | |
| 1189 | if (mips_monitor == MON_PMON && !mips_expect ("Exiting remote debug mode")) |
| 1190 | return -1; |
| 1191 | |
| 1192 | if (!mips_expect ("\015\012")) |
| 1193 | return -1; |
| 1194 | |
| 1195 | if (!mips_expect (mips_monitor_prompt)) |
| 1196 | return -1; |
| 1197 | |
| 1198 | return 0; |
| 1199 | } |
| 1200 | |
| 1201 | /* Initialize a new connection to the MIPS board, and make sure we are |
| 1202 | really connected. */ |
| 1203 | |
| 1204 | static void |
| 1205 | mips_initialize () |
| 1206 | { |
| 1207 | int err; |
| 1208 | struct cleanup *old_cleanups = make_cleanup (mips_initialize_cleanups, NULL); |
| 1209 | int j; |
| 1210 | |
| 1211 | /* What is this code doing here? I don't see any way it can happen, and |
| 1212 | it might mean mips_initializing didn't get cleared properly. |
| 1213 | So I'll make it a warning. */ |
| 1214 | |
| 1215 | if (mips_initializing) |
| 1216 | { |
| 1217 | warning ("internal error: mips_initialize called twice"); |
| 1218 | return; |
| 1219 | } |
| 1220 | |
| 1221 | mips_wait_flag = 0; |
| 1222 | mips_initializing = 1; |
| 1223 | |
| 1224 | /* At this point, the packit protocol isn't responding. We'll try getting |
| 1225 | into the monitor, and restarting the protocol. */ |
| 1226 | |
| 1227 | /* Force the system into the monitor. After this we *should* be at |
| 1228 | the mips_monitor_prompt. */ |
| 1229 | if (mips_monitor == MON_PMON) |
| 1230 | j = 0; /* start by checking if we are already at the prompt */ |
| 1231 | else |
| 1232 | j = 1; /* start by sending a break */ |
| 1233 | for (; j <= 4; j++) |
| 1234 | { |
| 1235 | switch (j) |
| 1236 | { |
| 1237 | case 0: /* First, try sending a CR */ |
| 1238 | SERIAL_FLUSH_INPUT (mips_desc); |
| 1239 | SERIAL_WRITE (mips_desc, "\015", 1); |
| 1240 | break; |
| 1241 | case 1: /* First, try sending a break */ |
| 1242 | SERIAL_SEND_BREAK (mips_desc); |
| 1243 | break; |
| 1244 | case 2: /* Then, try a ^C */ |
| 1245 | SERIAL_WRITE (mips_desc, "\003", 1); |
| 1246 | break; |
| 1247 | case 3: /* Then, try escaping from download */ |
| 1248 | { |
| 1249 | if (mips_monitor == MON_PMON) |
| 1250 | { |
| 1251 | char tbuff[7]; |
| 1252 | |
| 1253 | /* We shouldn't need to send multiple termination |
| 1254 | sequences, since the target performs line (or |
| 1255 | block) reads, and then processes those |
| 1256 | packets. In-case we were downloading a large packet |
| 1257 | we flush the output buffer before inserting a |
| 1258 | termination sequence. */ |
| 1259 | SERIAL_FLUSH_OUTPUT (mips_desc); |
| 1260 | sprintf (tbuff, "\015/E/E\015"); |
| 1261 | SERIAL_WRITE (mips_desc, tbuff, 6); |
| 1262 | } |
| 1263 | else |
| 1264 | { |
| 1265 | char srec[10]; |
| 1266 | int i; |
| 1267 | |
| 1268 | /* We are possibly in binary download mode, having |
| 1269 | aborted in the middle of an S-record. ^C won't |
| 1270 | work because of binary mode. The only reliable way |
| 1271 | out is to send enough termination packets (8 bytes) |
| 1272 | to fill up and then overflow the largest size |
| 1273 | S-record (255 bytes in this case). This amounts to |
| 1274 | 256/8 + 1 packets. |
| 1275 | */ |
| 1276 | |
| 1277 | mips_make_srec (srec, '7', 0, NULL, 0); |
| 1278 | |
| 1279 | for (i = 1; i <= 33; i++) |
| 1280 | { |
| 1281 | SERIAL_WRITE (mips_desc, srec, 8); |
| 1282 | |
| 1283 | if (SERIAL_READCHAR (mips_desc, 0) >= 0) |
| 1284 | break; /* Break immediatly if we get something from |
| 1285 | the board. */ |
| 1286 | } |
| 1287 | } |
| 1288 | } |
| 1289 | break; |
| 1290 | case 4: |
| 1291 | mips_error ("Failed to initialize."); |
| 1292 | } |
| 1293 | |
| 1294 | if (mips_expect (mips_monitor_prompt)) |
| 1295 | break; |
| 1296 | } |
| 1297 | |
| 1298 | if (mips_monitor == MON_PMON) |
| 1299 | { |
| 1300 | /* Ensure the correct target state: */ |
| 1301 | mips_send_command ("set regsize 64\015", -1); |
| 1302 | mips_send_command ("set hostport tty0\015", -1); |
| 1303 | mips_send_command ("set brkcmd \"\"\015", -1); |
| 1304 | /* Delete all the current breakpoints: */ |
| 1305 | mips_send_command ("db *\015", -1); |
| 1306 | /* NOTE: PMON does not have breakpoint support through the |
| 1307 | "debug" mode, only at the monitor command-line. */ |
| 1308 | } |
| 1309 | |
| 1310 | mips_enter_debug (); |
| 1311 | |
| 1312 | /* Clear all breakpoints: */ |
| 1313 | if (common_breakpoint ('b', -1, 0, NULL)) |
| 1314 | monitor_supports_breakpoints = 0; |
| 1315 | else |
| 1316 | monitor_supports_breakpoints = 1; |
| 1317 | |
| 1318 | do_cleanups (old_cleanups); |
| 1319 | |
| 1320 | /* If this doesn't call error, we have connected; we don't care if |
| 1321 | the request itself succeeds or fails. */ |
| 1322 | |
| 1323 | mips_request ('r', (unsigned int) 0, (unsigned int) 0, &err, |
| 1324 | mips_receive_wait, NULL); |
| 1325 | set_current_frame (create_new_frame (read_fp (), read_pc ())); |
| 1326 | select_frame (get_current_frame (), 0); |
| 1327 | } |
| 1328 | |
| 1329 | /* Open a connection to the remote board. */ |
| 1330 | static void |
| 1331 | common_open (ops, name, from_tty) |
| 1332 | struct target_ops *ops; |
| 1333 | char *name; |
| 1334 | int from_tty; |
| 1335 | { |
| 1336 | char *ptype; |
| 1337 | |
| 1338 | if (name == 0) |
| 1339 | error ( |
| 1340 | "To open a MIPS remote debugging connection, you need to specify what serial\n\ |
| 1341 | device is attached to the target board (e.g., /dev/ttya)."); |
| 1342 | |
| 1343 | target_preopen (from_tty); |
| 1344 | |
| 1345 | if (mips_is_open) |
| 1346 | unpush_target (current_ops); |
| 1347 | |
| 1348 | mips_desc = SERIAL_OPEN (name); |
| 1349 | if (mips_desc == (serial_t) NULL) |
| 1350 | perror_with_name (name); |
| 1351 | |
| 1352 | if (baud_rate != -1) |
| 1353 | { |
| 1354 | if (SERIAL_SETBAUDRATE (mips_desc, baud_rate)) |
| 1355 | { |
| 1356 | SERIAL_CLOSE (mips_desc); |
| 1357 | perror_with_name (name); |
| 1358 | } |
| 1359 | } |
| 1360 | |
| 1361 | SERIAL_RAW (mips_desc); |
| 1362 | |
| 1363 | current_ops = ops; |
| 1364 | mips_is_open = 1; |
| 1365 | |
| 1366 | mips_initialize (); |
| 1367 | |
| 1368 | if (from_tty) |
| 1369 | printf_unfiltered ("Remote MIPS debugging using %s\n", name); |
| 1370 | |
| 1371 | /* Switch to using remote target now. */ |
| 1372 | push_target (ops); |
| 1373 | |
| 1374 | /* FIXME: Should we call start_remote here? */ |
| 1375 | |
| 1376 | /* Try to figure out the processor model if possible. */ |
| 1377 | ptype = mips_read_processor_type (); |
| 1378 | if (ptype) |
| 1379 | mips_set_processor_type_command (strsave (ptype), 0); |
| 1380 | |
| 1381 | /* This is really the job of start_remote however, that makes an assumption |
| 1382 | that the target is about to print out a status message of some sort. That |
| 1383 | doesn't happen here (in fact, it may not be possible to get the monitor to |
| 1384 | send the appropriate packet). */ |
| 1385 | |
| 1386 | flush_cached_frames (); |
| 1387 | registers_changed (); |
| 1388 | stop_pc = read_pc (); |
| 1389 | set_current_frame (create_new_frame (read_fp (), stop_pc)); |
| 1390 | select_frame (get_current_frame (), 0); |
| 1391 | print_stack_frame (selected_frame, -1, 1); |
| 1392 | } |
| 1393 | |
| 1394 | static void |
| 1395 | mips_open (name, from_tty) |
| 1396 | char *name; |
| 1397 | int from_tty; |
| 1398 | { |
| 1399 | mips_monitor = MON_IDT; |
| 1400 | common_open (&mips_ops, name, from_tty); |
| 1401 | } |
| 1402 | |
| 1403 | static void |
| 1404 | pmon_open (name, from_tty) |
| 1405 | char *name; |
| 1406 | int from_tty; |
| 1407 | { |
| 1408 | /* The PMON monitor has a prompt different from the default |
| 1409 | "TARGET_MONITOR_PROMPT": */ |
| 1410 | mips_monitor_prompt = "PMON> "; |
| 1411 | mips_monitor = MON_PMON; |
| 1412 | common_open (&pmon_ops, name, from_tty); |
| 1413 | } |
| 1414 | |
| 1415 | |
| 1416 | /* Close a connection to the remote board. */ |
| 1417 | |
| 1418 | static void |
| 1419 | mips_close (quitting) |
| 1420 | int quitting; |
| 1421 | { |
| 1422 | if (mips_is_open) |
| 1423 | { |
| 1424 | int err; |
| 1425 | |
| 1426 | mips_is_open = 0; |
| 1427 | |
| 1428 | /* Get the board out of remote debugging mode. */ |
| 1429 | (void) mips_exit_debug (); |
| 1430 | |
| 1431 | SERIAL_CLOSE (mips_desc); |
| 1432 | } |
| 1433 | } |
| 1434 | |
| 1435 | /* Detach from the remote board. */ |
| 1436 | |
| 1437 | static void |
| 1438 | mips_detach (args, from_tty) |
| 1439 | char *args; |
| 1440 | int from_tty; |
| 1441 | { |
| 1442 | if (args) |
| 1443 | error ("Argument given to \"detach\" when remotely debugging."); |
| 1444 | |
| 1445 | pop_target (); |
| 1446 | |
| 1447 | mips_close (1); |
| 1448 | |
| 1449 | if (from_tty) |
| 1450 | printf_unfiltered ("Ending remote MIPS debugging.\n"); |
| 1451 | } |
| 1452 | |
| 1453 | /* Tell the target board to resume. This does not wait for a reply |
| 1454 | from the board. */ |
| 1455 | |
| 1456 | static void |
| 1457 | mips_resume (pid, step, siggnal) |
| 1458 | int pid, step; |
| 1459 | enum target_signal siggnal; |
| 1460 | { |
| 1461 | |
| 1462 | /* start-sanitize-gm */ |
| 1463 | #ifndef GENERAL_MAGIC |
| 1464 | if (siggnal != TARGET_SIGNAL_0) |
| 1465 | warning |
| 1466 | ("Can't send signals to a remote system. Try `handle %s ignore'.", |
| 1467 | target_signal_to_name (siggnal)); |
| 1468 | #endif /* GENERAL_MAGIC */ |
| 1469 | /* end-sanitize-gm */ |
| 1470 | |
| 1471 | mips_request (step ? 's' : 'c', |
| 1472 | (unsigned int) 1, |
| 1473 | (unsigned int) siggnal, |
| 1474 | (int *) NULL, |
| 1475 | mips_receive_wait, NULL); |
| 1476 | } |
| 1477 | |
| 1478 | /* Return the signal corresponding to SIG, where SIG is the number which |
| 1479 | the MIPS protocol uses for the signal. */ |
| 1480 | enum target_signal |
| 1481 | mips_signal_from_protocol (sig) |
| 1482 | int sig; |
| 1483 | { |
| 1484 | /* We allow a few more signals than the IDT board actually returns, on |
| 1485 | the theory that there is at least *some* hope that perhaps the numbering |
| 1486 | for these signals is widely agreed upon. */ |
| 1487 | if (sig <= 0 |
| 1488 | || sig > 31) |
| 1489 | return TARGET_SIGNAL_UNKNOWN; |
| 1490 | |
| 1491 | /* Don't want to use target_signal_from_host because we are converting |
| 1492 | from MIPS signal numbers, not host ones. Our internal numbers |
| 1493 | match the MIPS numbers for the signals the board can return, which |
| 1494 | are: SIGINT, SIGSEGV, SIGBUS, SIGILL, SIGFPE, SIGTRAP. */ |
| 1495 | return (enum target_signal) sig; |
| 1496 | } |
| 1497 | |
| 1498 | /* Wait until the remote stops, and return a wait status. */ |
| 1499 | |
| 1500 | static int |
| 1501 | mips_wait (pid, status) |
| 1502 | int pid; |
| 1503 | struct target_waitstatus *status; |
| 1504 | { |
| 1505 | int rstatus; |
| 1506 | int err; |
| 1507 | char buff[DATA_MAXLEN]; |
| 1508 | int rpc, rfp, rsp; |
| 1509 | char flags[20]; |
| 1510 | int nfields; |
| 1511 | |
| 1512 | interrupt_count = 0; |
| 1513 | hit_watchpoint = 0; |
| 1514 | |
| 1515 | /* If we have not sent a single step or continue command, then the |
| 1516 | board is waiting for us to do something. Return a status |
| 1517 | indicating that it is stopped. */ |
| 1518 | if (! mips_need_reply) |
| 1519 | { |
| 1520 | status->kind = TARGET_WAITKIND_STOPPED; |
| 1521 | status->value.sig = TARGET_SIGNAL_TRAP; |
| 1522 | return 0; |
| 1523 | } |
| 1524 | |
| 1525 | /* No timeout; we sit here as long as the program continues to execute. */ |
| 1526 | mips_wait_flag = 1; |
| 1527 | rstatus = mips_request ('\000', (unsigned int) 0, (unsigned int) 0, &err, -1, |
| 1528 | buff); |
| 1529 | mips_wait_flag = 0; |
| 1530 | if (err) |
| 1531 | mips_error ("Remote failure: %s", safe_strerror (errno)); |
| 1532 | |
| 1533 | nfields = sscanf (buff, "0x%*x %*c 0x%*x 0x%*x 0x%x 0x%x 0x%x 0x%*x %s", |
| 1534 | &rpc, &rfp, &rsp, flags); |
| 1535 | |
| 1536 | /* See if we got back extended status. If so, pick out the pc, fp, sp, etc... */ |
| 1537 | |
| 1538 | if (nfields == 7 || nfields == 9) |
| 1539 | { |
| 1540 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 1541 | |
| 1542 | store_unsigned_integer (buf, REGISTER_RAW_SIZE (PC_REGNUM), rpc); |
| 1543 | supply_register (PC_REGNUM, buf); |
| 1544 | |
| 1545 | store_unsigned_integer (buf, REGISTER_RAW_SIZE (PC_REGNUM), rfp); |
| 1546 | supply_register (30, buf); /* This register they are avoiding and so it is unnamed */ |
| 1547 | |
| 1548 | store_unsigned_integer (buf, REGISTER_RAW_SIZE (SP_REGNUM), rsp); |
| 1549 | supply_register (SP_REGNUM, buf); |
| 1550 | |
| 1551 | store_unsigned_integer (buf, REGISTER_RAW_SIZE (FP_REGNUM), 0); |
| 1552 | supply_register (FP_REGNUM, buf); |
| 1553 | |
| 1554 | if (nfields == 9) |
| 1555 | { |
| 1556 | int i; |
| 1557 | |
| 1558 | for (i = 0; i <= 2; i++) |
| 1559 | if (flags[i] == 'r' || flags[i] == 'w') |
| 1560 | hit_watchpoint = 1; |
| 1561 | else if (flags[i] == '\000') |
| 1562 | break; |
| 1563 | } |
| 1564 | } |
| 1565 | |
| 1566 | /* Translate a MIPS waitstatus. We use constants here rather than WTERMSIG |
| 1567 | and so on, because the constants we want here are determined by the |
| 1568 | MIPS protocol and have nothing to do with what host we are running on. */ |
| 1569 | if ((rstatus & 0377) == 0) |
| 1570 | { |
| 1571 | status->kind = TARGET_WAITKIND_EXITED; |
| 1572 | status->value.integer = (((rstatus) >> 8) & 0377); |
| 1573 | } |
| 1574 | else if ((rstatus & 0377) == 0177) |
| 1575 | { |
| 1576 | status->kind = TARGET_WAITKIND_STOPPED; |
| 1577 | status->value.sig = mips_signal_from_protocol (((rstatus) >> 8) & 0377); |
| 1578 | } |
| 1579 | else |
| 1580 | { |
| 1581 | status->kind = TARGET_WAITKIND_SIGNALLED; |
| 1582 | status->value.sig = mips_signal_from_protocol (rstatus & 0177); |
| 1583 | } |
| 1584 | |
| 1585 | return 0; |
| 1586 | } |
| 1587 | |
| 1588 | static int |
| 1589 | pmon_wait (pid, status) |
| 1590 | int pid; |
| 1591 | struct target_waitstatus *status; |
| 1592 | { |
| 1593 | int rstatus; |
| 1594 | int err; |
| 1595 | char buff[DATA_MAXLEN]; |
| 1596 | |
| 1597 | interrupt_count = 0; |
| 1598 | hit_watchpoint = 0; |
| 1599 | |
| 1600 | /* If we have not sent a single step or continue command, then the |
| 1601 | board is waiting for us to do something. Return a status |
| 1602 | indicating that it is stopped. */ |
| 1603 | if (! mips_need_reply) |
| 1604 | { |
| 1605 | status->kind = TARGET_WAITKIND_STOPPED; |
| 1606 | status->value.sig = TARGET_SIGNAL_TRAP; |
| 1607 | return 0; |
| 1608 | } |
| 1609 | |
| 1610 | /* Sit, polling the serial until the target decides to talk to |
| 1611 | us. NOTE: the timeout value we use is used not just for the |
| 1612 | first character, but for all the characters. */ |
| 1613 | mips_wait_flag = 1; |
| 1614 | rstatus = mips_request ('\000', (unsigned int) 0, (unsigned int) 0, &err, -1, |
| 1615 | buff); |
| 1616 | mips_wait_flag = 0; |
| 1617 | if (err) |
| 1618 | mips_error ("Remote failure: %s", safe_strerror (errno)); |
| 1619 | |
| 1620 | /* NOTE: The following (sig) numbers are defined by PMON: |
| 1621 | SPP_SIGTRAP 5 breakpoint |
| 1622 | SPP_SIGINT 2 |
| 1623 | SPP_SIGSEGV 11 |
| 1624 | SPP_SIGBUS 10 |
| 1625 | SPP_SIGILL 4 |
| 1626 | SPP_SIGFPE 8 |
| 1627 | SPP_SIGTERM 15 */ |
| 1628 | |
| 1629 | /* On returning from a continue, the PMON monitor seems to start |
| 1630 | echoing back the messages we send prior to sending back the |
| 1631 | ACK. The code can cope with this, but to try and avoid the |
| 1632 | unnecessary serial traffic, and "spurious" characters displayed |
| 1633 | to the user, we cheat and reset the debug protocol. The problems |
| 1634 | seems to be caused by a check on the number of arguments, and the |
| 1635 | command length, within the monitor causing it to echo the command |
| 1636 | as a bad packet. */ |
| 1637 | mips_exit_debug (); |
| 1638 | mips_enter_debug (); |
| 1639 | |
| 1640 | /* Translate a MIPS waitstatus. We use constants here rather than WTERMSIG |
| 1641 | and so on, because the constants we want here are determined by the |
| 1642 | MIPS protocol and have nothing to do with what host we are running on. */ |
| 1643 | if ((rstatus & 0377) == 0) |
| 1644 | { |
| 1645 | status->kind = TARGET_WAITKIND_EXITED; |
| 1646 | status->value.integer = (((rstatus) >> 8) & 0377); |
| 1647 | } |
| 1648 | else if ((rstatus & 0377) == 0177) |
| 1649 | { |
| 1650 | status->kind = TARGET_WAITKIND_STOPPED; |
| 1651 | status->value.sig = mips_signal_from_protocol (((rstatus) >> 8) & 0377); |
| 1652 | } |
| 1653 | else |
| 1654 | { |
| 1655 | status->kind = TARGET_WAITKIND_SIGNALLED; |
| 1656 | status->value.sig = mips_signal_from_protocol (rstatus & 0177); |
| 1657 | } |
| 1658 | |
| 1659 | return 0; |
| 1660 | } |
| 1661 | |
| 1662 | /* We have to map between the register numbers used by gdb and the |
| 1663 | register numbers used by the debugging protocol. This function |
| 1664 | assumes that we are using tm-mips.h. */ |
| 1665 | |
| 1666 | #define REGNO_OFFSET 96 |
| 1667 | |
| 1668 | static int |
| 1669 | mips_map_regno (regno) |
| 1670 | int regno; |
| 1671 | { |
| 1672 | if (regno < 32) |
| 1673 | return regno; |
| 1674 | if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32) |
| 1675 | return regno - FP0_REGNUM + 32; |
| 1676 | switch (regno) |
| 1677 | { |
| 1678 | case PC_REGNUM: |
| 1679 | return REGNO_OFFSET + 0; |
| 1680 | case CAUSE_REGNUM: |
| 1681 | return REGNO_OFFSET + 1; |
| 1682 | case HI_REGNUM: |
| 1683 | return REGNO_OFFSET + 2; |
| 1684 | case LO_REGNUM: |
| 1685 | return REGNO_OFFSET + 3; |
| 1686 | case FCRCS_REGNUM: |
| 1687 | return REGNO_OFFSET + 4; |
| 1688 | case FCRIR_REGNUM: |
| 1689 | return REGNO_OFFSET + 5; |
| 1690 | default: |
| 1691 | /* FIXME: Is there a way to get the status register? */ |
| 1692 | return 0; |
| 1693 | } |
| 1694 | } |
| 1695 | |
| 1696 | /* Fetch the remote registers. */ |
| 1697 | |
| 1698 | static void |
| 1699 | mips_fetch_registers (regno) |
| 1700 | int regno; |
| 1701 | { |
| 1702 | unsigned LONGEST val; |
| 1703 | int err; |
| 1704 | |
| 1705 | if (regno == -1) |
| 1706 | { |
| 1707 | for (regno = 0; regno < NUM_REGS; regno++) |
| 1708 | mips_fetch_registers (regno); |
| 1709 | return; |
| 1710 | } |
| 1711 | |
| 1712 | if (regno == FP_REGNUM || regno == ZERO_REGNUM) |
| 1713 | /* FP_REGNUM on the mips is a hack which is just supposed to read |
| 1714 | zero (see also mips-nat.c). */ |
| 1715 | val = 0; |
| 1716 | else |
| 1717 | { |
| 1718 | #if 0 /* Unfortunately the PMON version in the Vr4300 board has been |
| 1719 | compiled without the 64bit register access commands. This |
| 1720 | means we cannot get hold of the full register width. */ |
| 1721 | if (mips_monitor == MON_PMON) |
| 1722 | val = mips_request ('t', (unsigned int) mips_map_regno (regno), |
| 1723 | (unsigned int) 0, &err, mips_receive_wait, NULL); |
| 1724 | else |
| 1725 | #endif |
| 1726 | val = mips_request ('r', (unsigned int) mips_map_regno (regno), |
| 1727 | (unsigned int) 0, &err, mips_receive_wait, NULL); |
| 1728 | if (err) |
| 1729 | mips_error ("Can't read register %d: %s", regno, |
| 1730 | safe_strerror (errno)); |
| 1731 | } |
| 1732 | |
| 1733 | { |
| 1734 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 1735 | |
| 1736 | /* We got the number the register holds, but gdb expects to see a |
| 1737 | value in the target byte ordering. */ |
| 1738 | store_unsigned_integer (buf, REGISTER_RAW_SIZE (regno), val); |
| 1739 | supply_register (regno, buf); |
| 1740 | } |
| 1741 | } |
| 1742 | |
| 1743 | /* Prepare to store registers. The MIPS protocol can store individual |
| 1744 | registers, so this function doesn't have to do anything. */ |
| 1745 | |
| 1746 | static void |
| 1747 | mips_prepare_to_store () |
| 1748 | { |
| 1749 | } |
| 1750 | |
| 1751 | /* Store remote register(s). */ |
| 1752 | |
| 1753 | static void |
| 1754 | mips_store_registers (regno) |
| 1755 | int regno; |
| 1756 | { |
| 1757 | int err; |
| 1758 | |
| 1759 | if (regno == -1) |
| 1760 | { |
| 1761 | for (regno = 0; regno < NUM_REGS; regno++) |
| 1762 | mips_store_registers (regno); |
| 1763 | return; |
| 1764 | } |
| 1765 | |
| 1766 | mips_request ('R', (unsigned int) mips_map_regno (regno), |
| 1767 | (unsigned int) read_register (regno), |
| 1768 | &err, mips_receive_wait, NULL); |
| 1769 | if (err) |
| 1770 | mips_error ("Can't write register %d: %s", regno, safe_strerror (errno)); |
| 1771 | } |
| 1772 | |
| 1773 | /* Fetch a word from the target board. */ |
| 1774 | |
| 1775 | static int |
| 1776 | mips_fetch_word (addr) |
| 1777 | CORE_ADDR addr; |
| 1778 | { |
| 1779 | int val; |
| 1780 | int err; |
| 1781 | |
| 1782 | val = mips_request ('d', (unsigned int) addr, (unsigned int) 0, &err, |
| 1783 | mips_receive_wait, NULL); |
| 1784 | if (err) |
| 1785 | { |
| 1786 | /* Data space failed; try instruction space. */ |
| 1787 | val = mips_request ('i', (unsigned int) addr, (unsigned int) 0, &err, |
| 1788 | mips_receive_wait, NULL); |
| 1789 | if (err) |
| 1790 | mips_error ("Can't read address 0x%x: %s", addr, safe_strerror (errno)); |
| 1791 | } |
| 1792 | return val; |
| 1793 | } |
| 1794 | |
| 1795 | /* Store a word to the target board. Returns errno code or zero for |
| 1796 | success. If OLD_CONTENTS is non-NULL, put the old contents of that |
| 1797 | memory location there. */ |
| 1798 | |
| 1799 | static int |
| 1800 | mips_store_word (addr, val, old_contents) |
| 1801 | CORE_ADDR addr; |
| 1802 | int val; |
| 1803 | char *old_contents; |
| 1804 | { |
| 1805 | int err; |
| 1806 | unsigned int oldcontents; |
| 1807 | |
| 1808 | oldcontents = mips_request ('D', (unsigned int) addr, (unsigned int) val, |
| 1809 | &err, |
| 1810 | mips_receive_wait, NULL); |
| 1811 | if (err) |
| 1812 | { |
| 1813 | /* Data space failed; try instruction space. */ |
| 1814 | oldcontents = mips_request ('I', (unsigned int) addr, |
| 1815 | (unsigned int) val, &err, |
| 1816 | mips_receive_wait, NULL); |
| 1817 | if (err) |
| 1818 | return errno; |
| 1819 | } |
| 1820 | if (old_contents != NULL) |
| 1821 | store_unsigned_integer (old_contents, 4, oldcontents); |
| 1822 | return 0; |
| 1823 | } |
| 1824 | |
| 1825 | /* Read or write LEN bytes from inferior memory at MEMADDR, |
| 1826 | transferring to or from debugger address MYADDR. Write to inferior |
| 1827 | if SHOULD_WRITE is nonzero. Returns length of data written or |
| 1828 | read; 0 for error. Note that protocol gives us the correct value |
| 1829 | for a longword, since it transfers values in ASCII. We want the |
| 1830 | byte values, so we have to swap the longword values. */ |
| 1831 | |
| 1832 | static int |
| 1833 | mips_xfer_memory (memaddr, myaddr, len, write, ignore) |
| 1834 | CORE_ADDR memaddr; |
| 1835 | char *myaddr; |
| 1836 | int len; |
| 1837 | int write; |
| 1838 | struct target_ops *ignore; |
| 1839 | { |
| 1840 | register int i; |
| 1841 | /* Round starting address down to longword boundary. */ |
| 1842 | register CORE_ADDR addr = memaddr &~ 3; |
| 1843 | /* Round ending address up; get number of longwords that makes. */ |
| 1844 | register int count = (((memaddr + len) - addr) + 3) / 4; |
| 1845 | /* Allocate buffer of that many longwords. */ |
| 1846 | register char *buffer = alloca (count * 4); |
| 1847 | |
| 1848 | int status; |
| 1849 | |
| 1850 | if (write) |
| 1851 | { |
| 1852 | /* Fill start and end extra bytes of buffer with existing data. */ |
| 1853 | if (addr != memaddr || len < 4) |
| 1854 | { |
| 1855 | /* Need part of initial word -- fetch it. */ |
| 1856 | store_unsigned_integer (&buffer[0], 4, mips_fetch_word (addr)); |
| 1857 | } |
| 1858 | |
| 1859 | if (count > 1) |
| 1860 | { |
| 1861 | /* Need part of last word -- fetch it. FIXME: we do this even |
| 1862 | if we don't need it. */ |
| 1863 | store_unsigned_integer (&buffer[(count - 1) * 4], 4, |
| 1864 | mips_fetch_word (addr + (count - 1) * 4)); |
| 1865 | } |
| 1866 | |
| 1867 | /* Copy data to be written over corresponding part of buffer */ |
| 1868 | |
| 1869 | memcpy ((char *) buffer + (memaddr & 3), myaddr, len); |
| 1870 | |
| 1871 | /* Write the entire buffer. */ |
| 1872 | |
| 1873 | for (i = 0; i < count; i++, addr += 4) |
| 1874 | { |
| 1875 | status = mips_store_word (addr, |
| 1876 | extract_unsigned_integer (&buffer[i*4], 4), |
| 1877 | NULL); |
| 1878 | /* Report each kilobyte (we download 32-bit words at a time) */ |
| 1879 | if (i % 256 == 255) |
| 1880 | { |
| 1881 | printf_unfiltered ("*"); |
| 1882 | fflush (stdout); |
| 1883 | } |
| 1884 | if (status) |
| 1885 | { |
| 1886 | errno = status; |
| 1887 | return 0; |
| 1888 | } |
| 1889 | /* FIXME: Do we want a QUIT here? */ |
| 1890 | } |
| 1891 | if (count >= 256) |
| 1892 | printf_unfiltered ("\n"); |
| 1893 | } |
| 1894 | else |
| 1895 | { |
| 1896 | /* Read all the longwords */ |
| 1897 | for (i = 0; i < count; i++, addr += 4) |
| 1898 | { |
| 1899 | store_unsigned_integer (&buffer[i*4], 4, mips_fetch_word (addr)); |
| 1900 | QUIT; |
| 1901 | } |
| 1902 | |
| 1903 | /* Copy appropriate bytes out of the buffer. */ |
| 1904 | memcpy (myaddr, buffer + (memaddr & 3), len); |
| 1905 | } |
| 1906 | return len; |
| 1907 | } |
| 1908 | |
| 1909 | /* Print info on this target. */ |
| 1910 | |
| 1911 | static void |
| 1912 | mips_files_info (ignore) |
| 1913 | struct target_ops *ignore; |
| 1914 | { |
| 1915 | printf_unfiltered ("Debugging a MIPS board over a serial line.\n"); |
| 1916 | } |
| 1917 | |
| 1918 | /* Kill the process running on the board. This will actually only |
| 1919 | work if we are doing remote debugging over the console input. I |
| 1920 | think that if IDT/sim had the remote debug interrupt enabled on the |
| 1921 | right port, we could interrupt the process with a break signal. */ |
| 1922 | |
| 1923 | static void |
| 1924 | mips_kill () |
| 1925 | { |
| 1926 | if (!mips_wait_flag) |
| 1927 | return; |
| 1928 | |
| 1929 | interrupt_count++; |
| 1930 | |
| 1931 | if (interrupt_count >= 2) |
| 1932 | { |
| 1933 | interrupt_count = 0; |
| 1934 | |
| 1935 | target_terminal_ours (); |
| 1936 | |
| 1937 | if (query ("Interrupted while waiting for the program.\n\ |
| 1938 | Give up (and stop debugging it)? ")) |
| 1939 | { |
| 1940 | /* Clean up in such a way that mips_close won't try to talk to the |
| 1941 | board (it almost surely won't work since we weren't able to talk to |
| 1942 | it). */ |
| 1943 | mips_wait_flag = 0; |
| 1944 | mips_is_open = 0; |
| 1945 | SERIAL_CLOSE (mips_desc); |
| 1946 | |
| 1947 | printf_unfiltered ("Ending remote MIPS debugging.\n"); |
| 1948 | target_mourn_inferior (); |
| 1949 | |
| 1950 | return_to_top_level (RETURN_QUIT); |
| 1951 | } |
| 1952 | |
| 1953 | target_terminal_inferior (); |
| 1954 | } |
| 1955 | |
| 1956 | if (remote_debug > 0) |
| 1957 | printf_unfiltered ("Sending break\n"); |
| 1958 | |
| 1959 | SERIAL_SEND_BREAK (mips_desc); |
| 1960 | |
| 1961 | #if 0 |
| 1962 | if (mips_is_open) |
| 1963 | { |
| 1964 | char cc; |
| 1965 | |
| 1966 | /* Send a ^C. */ |
| 1967 | cc = '\003'; |
| 1968 | SERIAL_WRITE (mips_desc, &cc, 1); |
| 1969 | sleep (1); |
| 1970 | target_mourn_inferior (); |
| 1971 | } |
| 1972 | #endif |
| 1973 | } |
| 1974 | |
| 1975 | /* Start running on the target board. */ |
| 1976 | |
| 1977 | static void |
| 1978 | mips_create_inferior (execfile, args, env) |
| 1979 | char *execfile; |
| 1980 | char *args; |
| 1981 | char **env; |
| 1982 | { |
| 1983 | CORE_ADDR entry_pt; |
| 1984 | |
| 1985 | if (args && *args) |
| 1986 | { |
| 1987 | warning ("\ |
| 1988 | Can't pass arguments to remote MIPS board; arguments ignored."); |
| 1989 | /* And don't try to use them on the next "run" command. */ |
| 1990 | execute_command ("set args", 0); |
| 1991 | } |
| 1992 | |
| 1993 | if (execfile == 0 || exec_bfd == 0) |
| 1994 | error ("No executable file specified"); |
| 1995 | |
| 1996 | entry_pt = (CORE_ADDR) bfd_get_start_address (exec_bfd); |
| 1997 | |
| 1998 | init_wait_for_inferior (); |
| 1999 | |
| 2000 | /* FIXME: Should we set inferior_pid here? */ |
| 2001 | |
| 2002 | /* start-sanitize-gm */ |
| 2003 | #ifdef GENERAL_MAGIC |
| 2004 | magic_create_inferior_hook (); |
| 2005 | proceed (entry_pt, TARGET_SIGNAL_PWR, 0); |
| 2006 | #else |
| 2007 | /* end-sanitize-gm */ |
| 2008 | proceed (entry_pt, TARGET_SIGNAL_DEFAULT, 0); |
| 2009 | /* start-sanitize-gm */ |
| 2010 | #endif /* GENERAL_MAGIC */ |
| 2011 | /* end-sanitize-gm */ |
| 2012 | } |
| 2013 | |
| 2014 | /* Clean up after a process. Actually nothing to do. */ |
| 2015 | |
| 2016 | static void |
| 2017 | mips_mourn_inferior () |
| 2018 | { |
| 2019 | if (current_ops != NULL) |
| 2020 | unpush_target (current_ops); |
| 2021 | generic_mourn_inferior (); |
| 2022 | } |
| 2023 | \f |
| 2024 | /* We can write a breakpoint and read the shadow contents in one |
| 2025 | operation. */ |
| 2026 | |
| 2027 | /* The IDT board uses an unusual breakpoint value, and sometimes gets |
| 2028 | confused when it sees the usual MIPS breakpoint instruction. */ |
| 2029 | |
| 2030 | #define BREAK_INSN (0x00000a0d) |
| 2031 | #define BREAK_INSN_SIZE (4) |
| 2032 | |
| 2033 | /* Insert a breakpoint on targets that don't have any better breakpoint |
| 2034 | support. We read the contents of the target location and stash it, |
| 2035 | then overwrite it with a breakpoint instruction. ADDR is the target |
| 2036 | location in the target machine. CONTENTS_CACHE is a pointer to |
| 2037 | memory allocated for saving the target contents. It is guaranteed |
| 2038 | by the caller to be long enough to save sizeof BREAKPOINT bytes (this |
| 2039 | is accomplished via BREAKPOINT_MAX). */ |
| 2040 | |
| 2041 | static int |
| 2042 | mips_insert_breakpoint (addr, contents_cache) |
| 2043 | CORE_ADDR addr; |
| 2044 | char *contents_cache; |
| 2045 | { |
| 2046 | int status; |
| 2047 | |
| 2048 | if (monitor_supports_breakpoints) |
| 2049 | return common_breakpoint ('B', addr, 0x3, "f"); |
| 2050 | |
| 2051 | return mips_store_word (addr, BREAK_INSN, contents_cache); |
| 2052 | } |
| 2053 | |
| 2054 | static int |
| 2055 | mips_remove_breakpoint (addr, contents_cache) |
| 2056 | CORE_ADDR addr; |
| 2057 | char *contents_cache; |
| 2058 | { |
| 2059 | if (monitor_supports_breakpoints) |
| 2060 | return common_breakpoint ('b', addr, 0, NULL); |
| 2061 | |
| 2062 | return target_write_memory (addr, contents_cache, BREAK_INSN_SIZE); |
| 2063 | } |
| 2064 | |
| 2065 | #if 0 /* currently not used */ |
| 2066 | /* PMON does not currently provide support for the debug mode 'b' |
| 2067 | commands to manipulate breakpoints. However, if we wanted to use |
| 2068 | the monitor breakpoints (rather than the GDB BREAK_INSN version) |
| 2069 | then this code performs the work needed to leave debug mode, |
| 2070 | set/clear the breakpoint, and then return to debug mode. */ |
| 2071 | |
| 2072 | #define PMON_MAX_BP (33) /* 32 SW, 1 HW */ |
| 2073 | static CORE_ADDR mips_pmon_bp_info[PMON_MAX_BP]; |
| 2074 | /* NOTE: The code relies on this vector being zero-initialised by the system */ |
| 2075 | |
| 2076 | static int |
| 2077 | pmon_insert_breakpoint (addr, contents_cache) |
| 2078 | CORE_ADDR addr; |
| 2079 | char *contents_cache; |
| 2080 | { |
| 2081 | int status; |
| 2082 | |
| 2083 | if (monitor_supports_breakpoints) |
| 2084 | { |
| 2085 | char tbuff[12]; /* space for breakpoint command */ |
| 2086 | int bpnum; |
| 2087 | CORE_ADDR bpaddr; |
| 2088 | |
| 2089 | /* PMON does not support debug level breakpoint set/remove: */ |
| 2090 | if (mips_exit_debug ()) |
| 2091 | mips_error ("Failed to exit debug mode"); |
| 2092 | |
| 2093 | sprintf (tbuff, "b %08x\015", addr); |
| 2094 | mips_send_command (tbuff, 0); |
| 2095 | |
| 2096 | mips_expect ("Bpt "); |
| 2097 | |
| 2098 | if (!mips_getstring (tbuff, 2)) |
| 2099 | return 1; |
| 2100 | tbuff[2] = '\0'; /* terminate the string */ |
| 2101 | if (sscanf (tbuff, "%d", &bpnum) != 1) |
| 2102 | { |
| 2103 | fprintf_unfiltered (stderr, "Invalid decimal breakpoint number from target: %s\n", tbuff); |
| 2104 | return 1; |
| 2105 | } |
| 2106 | |
| 2107 | mips_expect (" = "); |
| 2108 | |
| 2109 | /* Lead in the hex number we are expecting: */ |
| 2110 | tbuff[0] = '0'; |
| 2111 | tbuff[1] = 'x'; |
| 2112 | |
| 2113 | if (!mips_getstring (&tbuff[2], 8)) |
| 2114 | return 1; |
| 2115 | tbuff[10] = '\0'; /* terminate the string */ |
| 2116 | |
| 2117 | if (sscanf (tbuff, "0x%08x", &bpaddr) != 1) |
| 2118 | { |
| 2119 | fprintf_unfiltered (stderr, "Invalid hex address from target: %s\n", tbuff); |
| 2120 | return 1; |
| 2121 | } |
| 2122 | |
| 2123 | if (bpnum >= PMON_MAX_BP) |
| 2124 | { |
| 2125 | fprintf_unfiltered (stderr, "Error: Returned breakpoint number %d outside acceptable range (0..%d)\n", |
| 2126 | bpnum, PMON_MAX_BP - 1); |
| 2127 | return 1; |
| 2128 | } |
| 2129 | |
| 2130 | if (bpaddr != addr) |
| 2131 | fprintf_unfiltered (stderr, "Warning: Breakpoint addresses do not match: 0x%x != 0x%x\n", addr, bpaddr); |
| 2132 | |
| 2133 | mips_pmon_bp_info[bpnum] = bpaddr; |
| 2134 | |
| 2135 | mips_expect ("\015\012"); |
| 2136 | mips_expect (mips_monitor_prompt); |
| 2137 | |
| 2138 | mips_enter_debug (); |
| 2139 | |
| 2140 | return 0; |
| 2141 | } |
| 2142 | |
| 2143 | return mips_store_word (addr, BREAK_INSN, contents_cache); |
| 2144 | } |
| 2145 | |
| 2146 | static int |
| 2147 | pmon_remove_breakpoint (addr, contents_cache) |
| 2148 | CORE_ADDR addr; |
| 2149 | char *contents_cache; |
| 2150 | { |
| 2151 | if (monitor_supports_breakpoints) |
| 2152 | { |
| 2153 | int bpnum; |
| 2154 | char tbuff[7]; /* enough for delete breakpoint command */ |
| 2155 | |
| 2156 | for (bpnum = 0; bpnum < PMON_MAX_BP; bpnum++) |
| 2157 | if (mips_pmon_bp_info[bpnum] == addr) |
| 2158 | break; |
| 2159 | |
| 2160 | if (bpnum >= PMON_MAX_BP) |
| 2161 | { |
| 2162 | fprintf_unfiltered (stderr, "pmon_remove_breakpoint: Failed to find breakpoint at address 0x%x\n", addr); |
| 2163 | return 1; |
| 2164 | } |
| 2165 | |
| 2166 | if (mips_exit_debug ()) |
| 2167 | mips_error ("Failed to exit debug mode"); |
| 2168 | |
| 2169 | sprintf (tbuff, "db %02d\015", bpnum); |
| 2170 | |
| 2171 | mips_send_command (tbuff, -1); |
| 2172 | /* NOTE: If the breakpoint does not exist then a "Bpt <dd> not |
| 2173 | set" message will be returned. */ |
| 2174 | |
| 2175 | mips_enter_debug (); |
| 2176 | |
| 2177 | return 0; |
| 2178 | } |
| 2179 | |
| 2180 | return target_write_memory (addr, contents_cache, BREAK_INSN_SIZE); |
| 2181 | } |
| 2182 | #endif |
| 2183 | |
| 2184 | /* Compute a don't care mask for the region bounding ADDR and ADDR + LEN - 1. |
| 2185 | This is used for memory ref breakpoints. */ |
| 2186 | |
| 2187 | static unsigned long |
| 2188 | calculate_mask (addr, len) |
| 2189 | CORE_ADDR addr; |
| 2190 | int len; |
| 2191 | { |
| 2192 | unsigned long mask; |
| 2193 | int i; |
| 2194 | |
| 2195 | mask = addr ^ (addr + len - 1); |
| 2196 | |
| 2197 | for (i = 32; i >= 0; i--) |
| 2198 | if (mask == 0) |
| 2199 | break; |
| 2200 | else |
| 2201 | mask >>= 1; |
| 2202 | |
| 2203 | mask = (unsigned long) 0xffffffff >> i; |
| 2204 | |
| 2205 | return mask; |
| 2206 | } |
| 2207 | |
| 2208 | /* Set a data watchpoint. ADDR and LEN should be obvious. TYPE is either 1 |
| 2209 | for a read watchpoint, or 2 for a read/write watchpoint. */ |
| 2210 | |
| 2211 | int |
| 2212 | remote_mips_set_watchpoint (addr, len, type) |
| 2213 | CORE_ADDR addr; |
| 2214 | int len; |
| 2215 | int type; |
| 2216 | { |
| 2217 | CORE_ADDR first_addr; |
| 2218 | unsigned long mask; |
| 2219 | char *flags; |
| 2220 | |
| 2221 | mask = calculate_mask (addr, len); |
| 2222 | |
| 2223 | first_addr = addr & ~mask; |
| 2224 | |
| 2225 | switch (type) |
| 2226 | { |
| 2227 | case 0: /* write */ |
| 2228 | flags = "w"; |
| 2229 | break; |
| 2230 | case 1: /* read */ |
| 2231 | flags = "r"; |
| 2232 | break; |
| 2233 | case 2: /* read/write */ |
| 2234 | flags = "rw"; |
| 2235 | break; |
| 2236 | default: |
| 2237 | abort (); |
| 2238 | } |
| 2239 | |
| 2240 | if (common_breakpoint ('B', first_addr, mask, flags)) |
| 2241 | return -1; |
| 2242 | |
| 2243 | return 0; |
| 2244 | } |
| 2245 | |
| 2246 | int |
| 2247 | remote_mips_remove_watchpoint (addr, len, type) |
| 2248 | CORE_ADDR addr; |
| 2249 | int len; |
| 2250 | int type; |
| 2251 | { |
| 2252 | CORE_ADDR first_addr; |
| 2253 | unsigned long mask; |
| 2254 | |
| 2255 | mask = calculate_mask (addr, len); |
| 2256 | |
| 2257 | first_addr = addr & ~mask; |
| 2258 | |
| 2259 | if (common_breakpoint ('b', first_addr, 0, NULL)) |
| 2260 | return -1; |
| 2261 | |
| 2262 | return 0; |
| 2263 | } |
| 2264 | |
| 2265 | int |
| 2266 | remote_mips_stopped_by_watchpoint () |
| 2267 | { |
| 2268 | return hit_watchpoint; |
| 2269 | } |
| 2270 | |
| 2271 | /* This routine generates the a breakpoint command of the form: |
| 2272 | |
| 2273 | 0x0 <CMD> <ADDR> <MASK> <FLAGS> |
| 2274 | |
| 2275 | Where <CMD> is one of: `B' to set, or `b' to clear a breakpoint. <ADDR> is |
| 2276 | the address of the breakpoint. <MASK> is a don't care mask for addresses. |
| 2277 | <FLAGS> is any combination of `r', `w', or `f' for read/write/or fetch. */ |
| 2278 | |
| 2279 | static int |
| 2280 | common_breakpoint (cmd, addr, mask, flags) |
| 2281 | int cmd; |
| 2282 | CORE_ADDR addr; |
| 2283 | CORE_ADDR mask; |
| 2284 | char *flags; |
| 2285 | { |
| 2286 | int len; |
| 2287 | char buf[DATA_MAXLEN + 1]; |
| 2288 | char rcmd; |
| 2289 | int rpid, rerrflg, rresponse; |
| 2290 | int nfields; |
| 2291 | |
| 2292 | if (flags) |
| 2293 | sprintf (buf, "0x0 %c 0x%x 0x%x %s", cmd, addr, mask, flags); |
| 2294 | else |
| 2295 | sprintf (buf, "0x0 %c 0x%x", cmd, addr); |
| 2296 | |
| 2297 | mips_send_packet (buf, 1); |
| 2298 | |
| 2299 | len = mips_receive_packet (buf, 1, mips_receive_wait); |
| 2300 | buf[len] = '\0'; |
| 2301 | |
| 2302 | nfields = sscanf (buf, "0x%x %c 0x%x 0x%x", &rpid, &rcmd, &rerrflg, &rresponse); |
| 2303 | |
| 2304 | if (nfields != 4 |
| 2305 | || rcmd != cmd) |
| 2306 | mips_error ("common_breakpoint: Bad response from remote board: %s", buf); |
| 2307 | |
| 2308 | if (rerrflg != 0) |
| 2309 | { |
| 2310 | if (rresponse != 22) /* invalid argument */ |
| 2311 | fprintf_unfiltered (stderr, "common_breakpoint (0x%x): Got error: 0x%x\n", |
| 2312 | addr, rresponse); |
| 2313 | return 1; |
| 2314 | } |
| 2315 | |
| 2316 | return 0; |
| 2317 | } |
| 2318 | \f |
| 2319 | static void |
| 2320 | send_srec (srec, len, addr) |
| 2321 | char *srec; |
| 2322 | int len; |
| 2323 | CORE_ADDR addr; |
| 2324 | { |
| 2325 | while (1) |
| 2326 | { |
| 2327 | int ch; |
| 2328 | |
| 2329 | SERIAL_WRITE (mips_desc, srec, len); |
| 2330 | |
| 2331 | ch = mips_readchar (2); |
| 2332 | |
| 2333 | switch (ch) |
| 2334 | { |
| 2335 | case SERIAL_TIMEOUT: |
| 2336 | error ("Timeout during download."); |
| 2337 | break; |
| 2338 | case 0x6: /* ACK */ |
| 2339 | return; |
| 2340 | case 0x15: /* NACK */ |
| 2341 | fprintf_unfiltered (gdb_stderr, "Download got a NACK at byte %d! Retrying.\n", addr); |
| 2342 | continue; |
| 2343 | default: |
| 2344 | error ("Download got unexpected ack char: 0x%x, retrying.\n", ch); |
| 2345 | } |
| 2346 | } |
| 2347 | } |
| 2348 | |
| 2349 | /* Download a binary file by converting it to S records. */ |
| 2350 | |
| 2351 | static void |
| 2352 | mips_load_srec (args) |
| 2353 | char *args; |
| 2354 | { |
| 2355 | bfd *abfd; |
| 2356 | asection *s; |
| 2357 | char *buffer, srec[1024]; |
| 2358 | int i; |
| 2359 | int srec_frame = 200; |
| 2360 | int reclen; |
| 2361 | static int hashmark = 1; |
| 2362 | |
| 2363 | buffer = alloca (srec_frame * 2 + 256); |
| 2364 | |
| 2365 | abfd = bfd_openr (args, 0); |
| 2366 | if (!abfd) |
| 2367 | { |
| 2368 | printf_filtered ("Unable to open file %s\n", args); |
| 2369 | return; |
| 2370 | } |
| 2371 | |
| 2372 | if (bfd_check_format (abfd, bfd_object) == 0) |
| 2373 | { |
| 2374 | printf_filtered ("File is not an object file\n"); |
| 2375 | return; |
| 2376 | } |
| 2377 | |
| 2378 | /* This actually causes a download in the IDT binary format: */ |
| 2379 | #define LOAD_CMD "load -b -s tty0\015" |
| 2380 | mips_send_command (LOAD_CMD, 0); |
| 2381 | |
| 2382 | for (s = abfd->sections; s; s = s->next) |
| 2383 | { |
| 2384 | if (s->flags & SEC_LOAD) |
| 2385 | { |
| 2386 | int numbytes; |
| 2387 | |
| 2388 | printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s->name, s->vma, |
| 2389 | s->vma + s->_raw_size); |
| 2390 | gdb_flush (gdb_stdout); |
| 2391 | |
| 2392 | for (i = 0; i < s->_raw_size; i += numbytes) |
| 2393 | { |
| 2394 | numbytes = min (srec_frame, s->_raw_size - i); |
| 2395 | |
| 2396 | bfd_get_section_contents (abfd, s, buffer, i, numbytes); |
| 2397 | |
| 2398 | reclen = mips_make_srec (srec, '3', s->vma + i, buffer, numbytes); |
| 2399 | send_srec (srec, reclen, s->vma + i); |
| 2400 | |
| 2401 | if (hashmark) |
| 2402 | { |
| 2403 | putchar_unfiltered ('#'); |
| 2404 | gdb_flush (gdb_stdout); |
| 2405 | } |
| 2406 | |
| 2407 | } /* Per-packet (or S-record) loop */ |
| 2408 | |
| 2409 | putchar_unfiltered ('\n'); |
| 2410 | } /* Loadable sections */ |
| 2411 | } |
| 2412 | if (hashmark) |
| 2413 | putchar_unfiltered ('\n'); |
| 2414 | |
| 2415 | /* Write a type 7 terminator record. no data for a type 7, and there |
| 2416 | is no data, so len is 0. */ |
| 2417 | |
| 2418 | reclen = mips_make_srec (srec, '7', abfd->start_address, NULL, 0); |
| 2419 | |
| 2420 | send_srec (srec, reclen, abfd->start_address); |
| 2421 | |
| 2422 | SERIAL_FLUSH_INPUT (mips_desc); |
| 2423 | } |
| 2424 | |
| 2425 | /* |
| 2426 | * mips_make_srec -- make an srecord. This writes each line, one at a |
| 2427 | * time, each with it's own header and trailer line. |
| 2428 | * An srecord looks like this: |
| 2429 | * |
| 2430 | * byte count-+ address |
| 2431 | * start ---+ | | data +- checksum |
| 2432 | * | | | | |
| 2433 | * S01000006F6B692D746573742E73726563E4 |
| 2434 | * S315000448600000000000000000FC00005900000000E9 |
| 2435 | * S31A0004000023C1400037DE00F023604000377B009020825000348D |
| 2436 | * S30B0004485A0000000000004E |
| 2437 | * S70500040000F6 |
| 2438 | * |
| 2439 | * S<type><length><address><data><checksum> |
| 2440 | * |
| 2441 | * Where |
| 2442 | * - length |
| 2443 | * is the number of bytes following upto the checksum. Note that |
| 2444 | * this is not the number of chars following, since it takes two |
| 2445 | * chars to represent a byte. |
| 2446 | * - type |
| 2447 | * is one of: |
| 2448 | * 0) header record |
| 2449 | * 1) two byte address data record |
| 2450 | * 2) three byte address data record |
| 2451 | * 3) four byte address data record |
| 2452 | * 7) four byte address termination record |
| 2453 | * 8) three byte address termination record |
| 2454 | * 9) two byte address termination record |
| 2455 | * |
| 2456 | * - address |
| 2457 | * is the start address of the data following, or in the case of |
| 2458 | * a termination record, the start address of the image |
| 2459 | * - data |
| 2460 | * is the data. |
| 2461 | * - checksum |
| 2462 | * is the sum of all the raw byte data in the record, from the length |
| 2463 | * upwards, modulo 256 and subtracted from 255. |
| 2464 | * |
| 2465 | * This routine returns the length of the S-record. |
| 2466 | * |
| 2467 | */ |
| 2468 | |
| 2469 | static int |
| 2470 | mips_make_srec (buf, type, memaddr, myaddr, len) |
| 2471 | char *buf; |
| 2472 | int type; |
| 2473 | CORE_ADDR memaddr; |
| 2474 | unsigned char *myaddr; |
| 2475 | int len; |
| 2476 | { |
| 2477 | unsigned char checksum; |
| 2478 | int i; |
| 2479 | |
| 2480 | /* Create the header for the srec. addr_size is the number of bytes in the address, |
| 2481 | and 1 is the number of bytes in the count. */ |
| 2482 | |
| 2483 | buf[0] = 'S'; |
| 2484 | buf[1] = type; |
| 2485 | buf[2] = len + 4 + 1; /* len + 4 byte address + 1 byte checksum */ |
| 2486 | /* This assumes S3 style downloads (4byte addresses). There should |
| 2487 | probably be a check, or the code changed to make it more |
| 2488 | explicit. */ |
| 2489 | buf[3] = memaddr >> 24; |
| 2490 | buf[4] = memaddr >> 16; |
| 2491 | buf[5] = memaddr >> 8; |
| 2492 | buf[6] = memaddr; |
| 2493 | memcpy (&buf[7], myaddr, len); |
| 2494 | |
| 2495 | /* Note that the checksum is calculated on the raw data, not the |
| 2496 | hexified data. It includes the length, address and the data |
| 2497 | portions of the packet. */ |
| 2498 | checksum = 0; |
| 2499 | buf += 2; /* Point at length byte */ |
| 2500 | for (i = 0; i < len + 4 + 1; i++) |
| 2501 | checksum += *buf++; |
| 2502 | |
| 2503 | *buf = ~checksum; |
| 2504 | |
| 2505 | return len + 8; |
| 2506 | } |
| 2507 | |
| 2508 | /* The following manifest controls whether we enable the simple flow |
| 2509 | control support provided by the monitor. If enabled the code will |
| 2510 | wait for an affirmative ACK between transmitting packets. */ |
| 2511 | #define DOETXACK (1) |
| 2512 | |
| 2513 | /* The PMON fast-download uses an encoded packet format constructed of |
| 2514 | 3byte data packets (encoded as 4 printable ASCII characters), and |
| 2515 | escape sequences (preceded by a '/'): |
| 2516 | |
| 2517 | 'K' clear checksum |
| 2518 | 'C' compare checksum (12bit value, not included in checksum calculation) |
| 2519 | 'S' define symbol name (for addr) terminated with "," and padded to 4char boundary |
| 2520 | 'Z' zero fill multiple of 3bytes |
| 2521 | 'B' byte (12bit encoded value, of 8bit data) |
| 2522 | 'A' address (36bit encoded value) |
| 2523 | 'E' define entry as original address, and exit load |
| 2524 | |
| 2525 | The packets are processed in 4 character chunks, so the escape |
| 2526 | sequences that do not have any data (or variable length data) |
| 2527 | should be padded to a 4 character boundary. The decoder will give |
| 2528 | an error if the complete message block size is not a multiple of |
| 2529 | 4bytes (size of record). |
| 2530 | |
| 2531 | The encoding of numbers is done in 6bit fields. The 6bit value is |
| 2532 | used to index into this string to get the specific character |
| 2533 | encoding for the value: */ |
| 2534 | static char encoding[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789,."; |
| 2535 | |
| 2536 | /* Convert the number of bits required into an encoded number, 6bits |
| 2537 | at a time (range 0..63). Keep a checksum if required (passed |
| 2538 | pointer non-NULL). The function returns the number of encoded |
| 2539 | characters written into the buffer. */ |
| 2540 | static int |
| 2541 | pmon_makeb64 (v, p, n, chksum) |
| 2542 | unsigned long v; |
| 2543 | char *p; |
| 2544 | int n; |
| 2545 | int *chksum; |
| 2546 | { |
| 2547 | int count = (n / 6); |
| 2548 | |
| 2549 | if ((n % 12) != 0) { |
| 2550 | fprintf_unfiltered(stderr,"Fast encoding bitcount must be a multiple of 12bits: %dbit%s\n",n,(n == 1)?"":"s"); |
| 2551 | return(0); |
| 2552 | } |
| 2553 | if (n > 36) { |
| 2554 | fprintf_unfiltered(stderr,"Fast encoding cannot process more than 36bits at the moment: %dbits\n",n); |
| 2555 | return(0); |
| 2556 | } |
| 2557 | |
| 2558 | /* Deal with the checksum: */ |
| 2559 | if (chksum != NULL) { |
| 2560 | switch (n) { |
| 2561 | case 36: *chksum += ((v >> 24) & 0xFFF); |
| 2562 | case 24: *chksum += ((v >> 12) & 0xFFF); |
| 2563 | case 12: *chksum += ((v >> 0) & 0xFFF); |
| 2564 | } |
| 2565 | } |
| 2566 | |
| 2567 | do { |
| 2568 | n -= 6; |
| 2569 | *p++ = encoding[(v >> n) & 0x3F]; |
| 2570 | } while (n > 0); |
| 2571 | |
| 2572 | return(count); |
| 2573 | } |
| 2574 | |
| 2575 | /* Shorthand function (that could be in-lined) to output the zero-fill |
| 2576 | escape sequence into the data stream. */ |
| 2577 | static int |
| 2578 | pmon_zeroset (recsize, buff, amount, chksum) |
| 2579 | int recsize; |
| 2580 | char **buff; |
| 2581 | int *amount; |
| 2582 | unsigned int *chksum; |
| 2583 | { |
| 2584 | int count; |
| 2585 | |
| 2586 | sprintf(*buff,"/Z"); |
| 2587 | count = pmon_makeb64 (*amount, (*buff + 2), 12, chksum); |
| 2588 | *buff += (count + 2); |
| 2589 | *amount = 0; |
| 2590 | return(recsize + count + 2); |
| 2591 | } |
| 2592 | |
| 2593 | static int |
| 2594 | pmon_checkset (recsize, buff, value) |
| 2595 | int recsize; |
| 2596 | char **buff; |
| 2597 | int *value; |
| 2598 | { |
| 2599 | int count; |
| 2600 | |
| 2601 | /* Add the checksum (without updating the value): */ |
| 2602 | sprintf (*buff, "/C"); |
| 2603 | count = pmon_makeb64 (*value, (*buff + 2), 12, NULL); |
| 2604 | *buff += (count + 2); |
| 2605 | sprintf (*buff, "\015"); |
| 2606 | *buff += 2; /* include zero terminator */ |
| 2607 | /* Forcing a checksum validation clears the sum: */ |
| 2608 | *value = 0; |
| 2609 | return(recsize + count + 3); |
| 2610 | } |
| 2611 | |
| 2612 | /* Amount of padding we leave after at the end of the output buffer, |
| 2613 | for the checksum and line termination characters: */ |
| 2614 | #define CHECKSIZE (4 + 4 + 4 + 2) |
| 2615 | /* zero-fill, checksum, transfer end and line termination space. */ |
| 2616 | |
| 2617 | /* The amount of binary data loaded from the object file in a single |
| 2618 | operation: */ |
| 2619 | #define BINCHUNK (1024) |
| 2620 | |
| 2621 | /* Maximum line of data accepted by the monitor: */ |
| 2622 | #define MAXRECSIZE (550) |
| 2623 | /* NOTE: This constant depends on the monitor being used. This value |
| 2624 | is for PMON 5.x on the Cogent Vr4300 board. */ |
| 2625 | |
| 2626 | static void |
| 2627 | pmon_make_fastrec (outbuf, inbuf, inptr, inamount, recsize, csum, zerofill) |
| 2628 | char **outbuf; |
| 2629 | unsigned char *inbuf; |
| 2630 | int *inptr; |
| 2631 | int inamount; |
| 2632 | int *recsize; |
| 2633 | unsigned int *csum; |
| 2634 | unsigned int *zerofill; |
| 2635 | { |
| 2636 | int count = 0; |
| 2637 | char *p = *outbuf; |
| 2638 | |
| 2639 | /* This is a simple check to ensure that our data will fit within |
| 2640 | the maximum allowable record size. Each record output is 4bytes |
| 2641 | in length. We must allow space for a pending zero fill command, |
| 2642 | the record, and a checksum record. */ |
| 2643 | while ((*recsize < (MAXRECSIZE - CHECKSIZE)) && ((inamount - *inptr) > 0)) { |
| 2644 | /* Process the binary data: */ |
| 2645 | if ((inamount - *inptr) < 3) { |
| 2646 | if (*zerofill != 0) |
| 2647 | *recsize = pmon_zeroset (*recsize, &p, zerofill, csum); |
| 2648 | sprintf (p, "/B"); |
| 2649 | count = pmon_makeb64 (inbuf[*inptr], &p[2], 12, csum); |
| 2650 | p += (2 + count); |
| 2651 | *recsize += (2 + count); |
| 2652 | (*inptr)++; |
| 2653 | } else { |
| 2654 | unsigned int value = ((inbuf[*inptr + 0] << 16) | (inbuf[*inptr + 1] << 8) | inbuf[*inptr + 2]); |
| 2655 | /* Simple check for zero data. TODO: A better check would be |
| 2656 | to check the last, and then the middle byte for being zero |
| 2657 | (if the first byte is not). We could then check for |
| 2658 | following runs of zeros, and if above a certain size it is |
| 2659 | worth the 4 or 8 character hit of the byte insertions used |
| 2660 | to pad to the start of the zeroes. NOTE: This also depends |
| 2661 | on the alignment at the end of the zero run. */ |
| 2662 | if (value == 0x00000000) { |
| 2663 | (*zerofill)++; |
| 2664 | if (*zerofill == 0xFFF) /* 12bit counter */ |
| 2665 | *recsize = pmon_zeroset (*recsize, &p, zerofill, csum); |
| 2666 | }else { |
| 2667 | if (*zerofill != 0) |
| 2668 | *recsize = pmon_zeroset (*recsize, &p, zerofill, csum); |
| 2669 | count = pmon_makeb64 (value, p, 24, csum); |
| 2670 | p += count; |
| 2671 | *recsize += count; |
| 2672 | } |
| 2673 | *inptr += 3; |
| 2674 | } |
| 2675 | } |
| 2676 | |
| 2677 | *outbuf = p; |
| 2678 | return; |
| 2679 | } |
| 2680 | |
| 2681 | #if defined(DOETXACK) |
| 2682 | static int |
| 2683 | pmon_check_ack() |
| 2684 | { |
| 2685 | int c = SERIAL_READCHAR (mips_desc, 2); |
| 2686 | if ((c == SERIAL_TIMEOUT) || (c != 0x06)) { |
| 2687 | fprintf_unfiltered (gdb_stderr, "Failed to receive valid ACK\n"); |
| 2688 | return(-1); /* terminate the download */ |
| 2689 | } |
| 2690 | return(0); |
| 2691 | } |
| 2692 | #endif /* DOETXACK */ |
| 2693 | |
| 2694 | static void |
| 2695 | pmon_load_fast (file) |
| 2696 | char *file; |
| 2697 | { |
| 2698 | bfd *abfd; |
| 2699 | asection *s; |
| 2700 | unsigned char *binbuf; |
| 2701 | char *buffer; |
| 2702 | int reclen; |
| 2703 | unsigned int csum = 0; |
| 2704 | static int hashmark = 1; |
| 2705 | int bintotal = 0; |
| 2706 | int final; |
| 2707 | int finished = 0; |
| 2708 | |
| 2709 | buffer = (char *)xmalloc(MAXRECSIZE + 1); |
| 2710 | binbuf = (unsigned char *)xmalloc(BINCHUNK); |
| 2711 | |
| 2712 | abfd = bfd_openr(file,0); |
| 2713 | if (!abfd) |
| 2714 | { |
| 2715 | printf_filtered ("Unable to open file %s\n",file); |
| 2716 | return; |
| 2717 | } |
| 2718 | |
| 2719 | if (bfd_check_format(abfd,bfd_object) == 0) |
| 2720 | { |
| 2721 | printf_filtered("File is not an object file\n"); |
| 2722 | return; |
| 2723 | } |
| 2724 | |
| 2725 | /* Setup the required download state: */ |
| 2726 | mips_send_command ("set dlproto etxack\015", -1); |
| 2727 | mips_send_command ("set dlecho off\015", -1); |
| 2728 | /* NOTE: We get a "cannot set variable" message if the variable is |
| 2729 | already defined to have the argument we give. The code doesn't |
| 2730 | care, since it just scans to the next prompt anyway. */ |
| 2731 | /* Start the download: */ |
| 2732 | mips_send_command (LOAD_CMD, 0); |
| 2733 | mips_expect ("Downloading from tty0, ^C to abort\015\012"); |
| 2734 | |
| 2735 | /* Zero the checksum */ |
| 2736 | sprintf(buffer,"/Kxx\015"); |
| 2737 | reclen = strlen(buffer); |
| 2738 | SERIAL_WRITE (mips_desc, buffer, reclen); |
| 2739 | |
| 2740 | #if defined(DOETXACK) |
| 2741 | finished = pmon_check_ack(); |
| 2742 | #endif /* DOETXACK */ |
| 2743 | |
| 2744 | for (s = abfd->sections; s && !finished; s = s->next) |
| 2745 | if (s->flags & SEC_LOAD) /* only deal with loadable sections */ |
| 2746 | { |
| 2747 | bintotal += s->_raw_size; |
| 2748 | final = (s->vma + s->_raw_size); |
| 2749 | |
| 2750 | printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s->name, s->vma, |
| 2751 | s->vma + s->_raw_size); |
| 2752 | gdb_flush (gdb_stdout); |
| 2753 | |
| 2754 | /* Output the starting address */ |
| 2755 | sprintf(buffer,"/A"); |
| 2756 | reclen = pmon_makeb64(s->vma,&buffer[2],36,&csum); |
| 2757 | buffer[2 + reclen] = '\015'; |
| 2758 | buffer[3 + reclen] = '\0'; |
| 2759 | reclen += 3; /* for the initial escape code and carriage return */ |
| 2760 | SERIAL_WRITE (mips_desc, buffer, reclen); |
| 2761 | #if defined(DOETXACK) |
| 2762 | finished = pmon_check_ack(); |
| 2763 | #endif /* DOETXACK */ |
| 2764 | |
| 2765 | if (!finished) |
| 2766 | { |
| 2767 | int binamount; |
| 2768 | unsigned int zerofill = 0; |
| 2769 | char *bp = buffer; |
| 2770 | int i; |
| 2771 | |
| 2772 | reclen = 0; |
| 2773 | |
| 2774 | for (i = 0; ((i < s->_raw_size) && !finished); i += binamount) { |
| 2775 | int binptr = 0; |
| 2776 | |
| 2777 | binamount = min (BINCHUNK, s->_raw_size - i); |
| 2778 | |
| 2779 | bfd_get_section_contents (abfd, s, binbuf, i, binamount); |
| 2780 | |
| 2781 | /* This keeps a rolling checksum, until we decide to output |
| 2782 | the line: */ |
| 2783 | for (; ((binamount - binptr) > 0);) { |
| 2784 | pmon_make_fastrec (&bp, binbuf, &binptr, binamount, &reclen, &csum, &zerofill); |
| 2785 | if (reclen >= (MAXRECSIZE - CHECKSIZE)) { |
| 2786 | reclen = pmon_checkset (reclen, &bp, &csum); |
| 2787 | SERIAL_WRITE (mips_desc, buffer, reclen); |
| 2788 | #if defined(DOETXACK) |
| 2789 | finished = pmon_check_ack(); |
| 2790 | if (finished) { |
| 2791 | zerofill = 0; /* do not transmit pending zerofills */ |
| 2792 | break; |
| 2793 | } |
| 2794 | #endif /* DOETXACK */ |
| 2795 | |
| 2796 | if (hashmark) { |
| 2797 | putchar_unfiltered ('#'); |
| 2798 | gdb_flush (gdb_stdout); |
| 2799 | } |
| 2800 | |
| 2801 | bp = buffer; |
| 2802 | reclen = 0; /* buffer processed */ |
| 2803 | } |
| 2804 | } |
| 2805 | } |
| 2806 | |
| 2807 | /* Ensure no out-standing zerofill requests: */ |
| 2808 | if (zerofill != 0) |
| 2809 | reclen = pmon_zeroset (reclen, &bp, &zerofill, &csum); |
| 2810 | |
| 2811 | /* and then flush the line: */ |
| 2812 | if (reclen > 0) { |
| 2813 | reclen = pmon_checkset (reclen, &bp, &csum); |
| 2814 | /* Currently pmon_checkset outputs the line terminator by |
| 2815 | default, so we write out the buffer so far: */ |
| 2816 | SERIAL_WRITE (mips_desc, buffer, reclen); |
| 2817 | #if defined(DOETXACK) |
| 2818 | finished = pmon_check_ack(); |
| 2819 | #endif /* DOETXACK */ |
| 2820 | } |
| 2821 | } |
| 2822 | |
| 2823 | if (hashmark) |
| 2824 | putchar_unfiltered ('\n'); |
| 2825 | } |
| 2826 | |
| 2827 | /* Terminate the transfer. We know that we have an empty output |
| 2828 | buffer at this point. */ |
| 2829 | sprintf (buffer, "/E/E\015"); /* include dummy padding characters */ |
| 2830 | reclen = strlen (buffer); |
| 2831 | SERIAL_WRITE (mips_desc, buffer, reclen); |
| 2832 | |
| 2833 | if (finished) { /* Ignore the termination message: */ |
| 2834 | SERIAL_FLUSH_INPUT (mips_desc); |
| 2835 | } else { /* Deal with termination message: */ |
| 2836 | char hexnumber[9]; /* includes '\0' space */ |
| 2837 | mips_expect ("Entry Address = "); |
| 2838 | sprintf(hexnumber,"%x",final); |
| 2839 | mips_expect (hexnumber); |
| 2840 | #if defined(DOETXACK) |
| 2841 | mips_expect ("\015\012\006\015\012total = 0x"); |
| 2842 | #else /* normal termination */ |
| 2843 | mips_expect ("\015\012\015\012total = 0x"); |
| 2844 | #endif /* !DOETXACK */ |
| 2845 | sprintf(hexnumber,"%x",bintotal); |
| 2846 | mips_expect (hexnumber); |
| 2847 | mips_expect (" bytes\015\012"); |
| 2848 | } |
| 2849 | |
| 2850 | return; |
| 2851 | } |
| 2852 | |
| 2853 | /* mips_load -- download a file. */ |
| 2854 | |
| 2855 | static void |
| 2856 | mips_load (file, from_tty) |
| 2857 | char *file; |
| 2858 | int from_tty; |
| 2859 | { |
| 2860 | /* Get the board out of remote debugging mode. */ |
| 2861 | if (mips_exit_debug ()) |
| 2862 | error ("mips_load: Couldn't get into monitor mode."); |
| 2863 | |
| 2864 | if (mips_monitor == MON_PMON) |
| 2865 | pmon_load_fast (file); |
| 2866 | else |
| 2867 | mips_load_srec (file); |
| 2868 | |
| 2869 | mips_initialize (); |
| 2870 | |
| 2871 | /* Finally, make the PC point at the start address */ |
| 2872 | |
| 2873 | if (exec_bfd) |
| 2874 | write_pc (bfd_get_start_address (exec_bfd)); |
| 2875 | |
| 2876 | inferior_pid = 0; /* No process now */ |
| 2877 | |
| 2878 | /* This is necessary because many things were based on the PC at the time that |
| 2879 | we attached to the monitor, which is no longer valid now that we have loaded |
| 2880 | new code (and just changed the PC). Another way to do this might be to call |
| 2881 | normal_stop, except that the stack may not be valid, and things would get |
| 2882 | horribly confused... */ |
| 2883 | |
| 2884 | clear_symtab_users (); |
| 2885 | } |
| 2886 | \f |
| 2887 | /* The target vector. */ |
| 2888 | |
| 2889 | struct target_ops mips_ops = |
| 2890 | { |
| 2891 | "mips", /* to_shortname */ |
| 2892 | "Remote MIPS debugging over serial line", /* to_longname */ |
| 2893 | "\ |
| 2894 | Debug a board using the MIPS remote debugging protocol over a serial line.\n\ |
| 2895 | The argument is the device it is connected to or, if it contains a colon,\n\ |
| 2896 | HOST:PORT to access a board over a network", /* to_doc */ |
| 2897 | mips_open, /* to_open */ |
| 2898 | mips_close, /* to_close */ |
| 2899 | NULL, /* to_attach */ |
| 2900 | mips_detach, /* to_detach */ |
| 2901 | mips_resume, /* to_resume */ |
| 2902 | mips_wait, /* to_wait */ |
| 2903 | mips_fetch_registers, /* to_fetch_registers */ |
| 2904 | mips_store_registers, /* to_store_registers */ |
| 2905 | mips_prepare_to_store, /* to_prepare_to_store */ |
| 2906 | mips_xfer_memory, /* to_xfer_memory */ |
| 2907 | mips_files_info, /* to_files_info */ |
| 2908 | mips_insert_breakpoint, /* to_insert_breakpoint */ |
| 2909 | mips_remove_breakpoint, /* to_remove_breakpoint */ |
| 2910 | NULL, /* to_terminal_init */ |
| 2911 | NULL, /* to_terminal_inferior */ |
| 2912 | NULL, /* to_terminal_ours_for_output */ |
| 2913 | NULL, /* to_terminal_ours */ |
| 2914 | NULL, /* to_terminal_info */ |
| 2915 | mips_kill, /* to_kill */ |
| 2916 | mips_load, /* to_load */ |
| 2917 | NULL, /* to_lookup_symbol */ |
| 2918 | mips_create_inferior, /* to_create_inferior */ |
| 2919 | mips_mourn_inferior, /* to_mourn_inferior */ |
| 2920 | NULL, /* to_can_run */ |
| 2921 | NULL, /* to_notice_signals */ |
| 2922 | 0, /* to_thread_alive */ |
| 2923 | 0, /* to_stop */ |
| 2924 | process_stratum, /* to_stratum */ |
| 2925 | NULL, /* to_next */ |
| 2926 | 1, /* to_has_all_memory */ |
| 2927 | 1, /* to_has_memory */ |
| 2928 | 1, /* to_has_stack */ |
| 2929 | 1, /* to_has_registers */ |
| 2930 | 1, /* to_has_execution */ |
| 2931 | NULL, /* sections */ |
| 2932 | NULL, /* sections_end */ |
| 2933 | OPS_MAGIC /* to_magic */ |
| 2934 | }; |
| 2935 | \f |
| 2936 | /* An alternative target vector: */ |
| 2937 | struct target_ops pmon_ops = |
| 2938 | { |
| 2939 | "pmon", /* to_shortname */ |
| 2940 | "Remote MIPS debugging over serial line", /* to_longname */ |
| 2941 | "\ |
| 2942 | Debug a board using the PMON MIPS remote debugging protocol over a serial\n\ |
| 2943 | line. The argument is the device it is connected to or, if it contains a\n\ |
| 2944 | colon, HOST:PORT to access a board over a network", /* to_doc */ |
| 2945 | pmon_open, /* to_open */ |
| 2946 | mips_close, /* to_close */ |
| 2947 | NULL, /* to_attach */ |
| 2948 | mips_detach, /* to_detach */ |
| 2949 | mips_resume, /* to_resume */ |
| 2950 | pmon_wait, /* to_wait */ |
| 2951 | mips_fetch_registers, /* to_fetch_registers */ |
| 2952 | mips_store_registers, /* to_store_registers */ |
| 2953 | mips_prepare_to_store, /* to_prepare_to_store */ |
| 2954 | mips_xfer_memory, /* to_xfer_memory */ |
| 2955 | mips_files_info, /* to_files_info */ |
| 2956 | mips_insert_breakpoint, /* to_insert_breakpoint */ |
| 2957 | mips_remove_breakpoint, /* to_remove_breakpoint */ |
| 2958 | NULL, /* to_terminal_init */ |
| 2959 | NULL, /* to_terminal_inferior */ |
| 2960 | NULL, /* to_terminal_ours_for_output */ |
| 2961 | NULL, /* to_terminal_ours */ |
| 2962 | NULL, /* to_terminal_info */ |
| 2963 | mips_kill, /* to_kill */ |
| 2964 | mips_load, /* to_load */ |
| 2965 | NULL, /* to_lookup_symbol */ |
| 2966 | mips_create_inferior, /* to_create_inferior */ |
| 2967 | mips_mourn_inferior, /* to_mourn_inferior */ |
| 2968 | NULL, /* to_can_run */ |
| 2969 | NULL, /* to_notice_signals */ |
| 2970 | 0, /* to_thread_alive */ |
| 2971 | 0, /* to_stop */ |
| 2972 | process_stratum, /* to_stratum */ |
| 2973 | NULL, /* to_next */ |
| 2974 | 1, /* to_has_all_memory */ |
| 2975 | 1, /* to_has_memory */ |
| 2976 | 1, /* to_has_stack */ |
| 2977 | 1, /* to_has_registers */ |
| 2978 | 1, /* to_has_execution */ |
| 2979 | NULL, /* sections */ |
| 2980 | NULL, /* sections_end */ |
| 2981 | OPS_MAGIC /* to_magic */ |
| 2982 | }; |
| 2983 | \f |
| 2984 | void |
| 2985 | _initialize_remote_mips () |
| 2986 | { |
| 2987 | add_target (&mips_ops); |
| 2988 | add_target (&pmon_ops); |
| 2989 | |
| 2990 | add_show_from_set ( |
| 2991 | add_set_cmd ("timeout", no_class, var_zinteger, |
| 2992 | (char *) &mips_receive_wait, |
| 2993 | "Set timeout in seconds for remote MIPS serial I/O.", |
| 2994 | &setlist), |
| 2995 | &showlist); |
| 2996 | |
| 2997 | add_show_from_set ( |
| 2998 | add_set_cmd ("retransmit-timeout", no_class, var_zinteger, |
| 2999 | (char *) &mips_retransmit_wait, |
| 3000 | "Set retransmit timeout in seconds for remote MIPS serial I/O.\n\ |
| 3001 | This is the number of seconds to wait for an acknowledgement to a packet\n\ |
| 3002 | before resending the packet.", &setlist), |
| 3003 | &showlist); |
| 3004 | |
| 3005 | add_show_from_set ( |
| 3006 | add_set_cmd ("syn-garbage-limit", no_class, var_zinteger, |
| 3007 | (char *) &mips_syn_garbage, |
| 3008 | "Set the maximum number of characters to ignore when scanning for a SYN.\n\ |
| 3009 | This is the maximum number of characters GDB will ignore when trying to\n\ |
| 3010 | synchronize with the remote system. A value of -1 means that there is no limit\n\ |
| 3011 | (Note that these characters are printed out even though they are ignored.)", |
| 3012 | &setlist), |
| 3013 | &showlist); |
| 3014 | } |