| 1 | /* Remote debugging interface for MIPS remote debugging protocol. |
| 2 | Copyright 1993, 1994, 1995, 2000 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, |
| 21 | Boston, MA 02111-1307, USA. */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | #include "inferior.h" |
| 25 | #include "bfd.h" |
| 26 | #include "symfile.h" |
| 27 | #include "gdb_wait.h" |
| 28 | #include "gdbcmd.h" |
| 29 | #include "gdbcore.h" |
| 30 | #include "serial.h" |
| 31 | #include "target.h" |
| 32 | #include "remote-utils.h" |
| 33 | #include "gdb_string.h" |
| 34 | |
| 35 | #include <signal.h> |
| 36 | #include <sys/types.h> |
| 37 | #include <sys/stat.h> |
| 38 | |
| 39 | #include <ctype.h> |
| 40 | |
| 41 | /* Microsoft C's stat.h doesn't define all the POSIX file modes. */ |
| 42 | #ifndef S_IROTH |
| 43 | #define S_IROTH S_IREAD |
| 44 | #endif |
| 45 | |
| 46 | \f |
| 47 | |
| 48 | /* Breakpoint types. Values 0, 1, and 2 must agree with the watch |
| 49 | types passed by breakpoint.c to target_insert_watchpoint. |
| 50 | Value 3 is our own invention, and is used for ordinary instruction |
| 51 | breakpoints. Value 4 is used to mark an unused watchpoint in tables. */ |
| 52 | enum break_type |
| 53 | { |
| 54 | BREAK_WRITE, /* 0 */ |
| 55 | BREAK_READ, /* 1 */ |
| 56 | BREAK_ACCESS, /* 2 */ |
| 57 | BREAK_FETCH, /* 3 */ |
| 58 | BREAK_UNUSED /* 4 */ |
| 59 | }; |
| 60 | |
| 61 | /* Prototypes for local functions. */ |
| 62 | |
| 63 | static int mips_readchar (int timeout); |
| 64 | |
| 65 | static int mips_receive_header (unsigned char *hdr, int *pgarbage, |
| 66 | int ch, int timeout); |
| 67 | |
| 68 | static int mips_receive_trailer (unsigned char *trlr, int *pgarbage, |
| 69 | int *pch, int timeout); |
| 70 | |
| 71 | static int mips_cksum (const unsigned char *hdr, |
| 72 | const unsigned char *data, int len); |
| 73 | |
| 74 | static void mips_send_packet (const char *s, int get_ack); |
| 75 | |
| 76 | static void mips_send_command (const char *cmd, int prompt); |
| 77 | |
| 78 | static int mips_receive_packet (char *buff, int throw_error, int timeout); |
| 79 | |
| 80 | static ULONGEST mips_request (int cmd, ULONGEST addr, ULONGEST data, |
| 81 | int *perr, int timeout, char *buff); |
| 82 | |
| 83 | static void mips_initialize (void); |
| 84 | |
| 85 | static void mips_open (char *name, int from_tty); |
| 86 | |
| 87 | static void pmon_open (char *name, int from_tty); |
| 88 | |
| 89 | static void ddb_open (char *name, int from_tty); |
| 90 | |
| 91 | static void lsi_open (char *name, int from_tty); |
| 92 | |
| 93 | static void mips_close (int quitting); |
| 94 | |
| 95 | static void mips_detach (char *args, int from_tty); |
| 96 | |
| 97 | static void mips_resume (int pid, int step, enum target_signal siggnal); |
| 98 | |
| 99 | static int mips_wait (int pid, struct target_waitstatus *status); |
| 100 | |
| 101 | static int mips_map_regno (int regno); |
| 102 | |
| 103 | static void mips_fetch_registers (int regno); |
| 104 | |
| 105 | static void mips_prepare_to_store (void); |
| 106 | |
| 107 | static void mips_store_registers (int regno); |
| 108 | |
| 109 | static unsigned int mips_fetch_word (CORE_ADDR addr); |
| 110 | |
| 111 | static int mips_store_word (CORE_ADDR addr, unsigned int value, |
| 112 | char *old_contents); |
| 113 | |
| 114 | static int mips_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, |
| 115 | int write, struct target_ops *ignore); |
| 116 | |
| 117 | static void mips_files_info (struct target_ops *ignore); |
| 118 | |
| 119 | static void mips_create_inferior (char *execfile, char *args, char **env); |
| 120 | |
| 121 | static void mips_mourn_inferior (void); |
| 122 | |
| 123 | static int pmon_makeb64 (unsigned long v, char *p, int n, int *chksum); |
| 124 | |
| 125 | static int pmon_zeroset (int recsize, char **buff, int *amount, |
| 126 | unsigned int *chksum); |
| 127 | |
| 128 | static int pmon_checkset (int recsize, char **buff, int *value); |
| 129 | |
| 130 | static void pmon_make_fastrec (char **outbuf, unsigned char *inbuf, |
| 131 | int *inptr, int inamount, int *recsize, |
| 132 | unsigned int *csum, unsigned int *zerofill); |
| 133 | |
| 134 | static int pmon_check_ack (char *mesg); |
| 135 | |
| 136 | static void pmon_start_download (void); |
| 137 | |
| 138 | static void pmon_end_download (int final, int bintotal); |
| 139 | |
| 140 | static void pmon_download (char *buffer, int length); |
| 141 | |
| 142 | static void pmon_load_fast (char *file); |
| 143 | |
| 144 | static void mips_load (char *file, int from_tty); |
| 145 | |
| 146 | static int mips_make_srec (char *buffer, int type, CORE_ADDR memaddr, |
| 147 | unsigned char *myaddr, int len); |
| 148 | |
| 149 | static int set_breakpoint (CORE_ADDR addr, int len, enum break_type type); |
| 150 | |
| 151 | static int clear_breakpoint (CORE_ADDR addr, int len, enum break_type type); |
| 152 | |
| 153 | static int common_breakpoint (int set, CORE_ADDR addr, int len, |
| 154 | enum break_type type); |
| 155 | |
| 156 | /* Forward declarations. */ |
| 157 | extern struct target_ops mips_ops; |
| 158 | extern struct target_ops pmon_ops; |
| 159 | extern struct target_ops ddb_ops; |
| 160 | \f/* *INDENT-OFF* */ |
| 161 | /* The MIPS remote debugging interface is built on top of a simple |
| 162 | packet protocol. Each packet is organized as follows: |
| 163 | |
| 164 | SYN The first character is always a SYN (ASCII 026, or ^V). SYN |
| 165 | may not appear anywhere else in the packet. Any time a SYN is |
| 166 | seen, a new packet should be assumed to have begun. |
| 167 | |
| 168 | TYPE_LEN |
| 169 | This byte contains the upper five bits of the logical length |
| 170 | of the data section, plus a single bit indicating whether this |
| 171 | is a data packet or an acknowledgement. The documentation |
| 172 | indicates that this bit is 1 for a data packet, but the actual |
| 173 | board uses 1 for an acknowledgement. The value of the byte is |
| 174 | 0x40 + (ack ? 0x20 : 0) + (len >> 6) |
| 175 | (we always have 0 <= len < 1024). Acknowledgement packets do |
| 176 | not carry data, and must have a data length of 0. |
| 177 | |
| 178 | LEN1 This byte contains the lower six bits of the logical length of |
| 179 | the data section. The value is |
| 180 | 0x40 + (len & 0x3f) |
| 181 | |
| 182 | SEQ This byte contains the six bit sequence number of the packet. |
| 183 | The value is |
| 184 | 0x40 + seq |
| 185 | An acknowlegment packet contains the sequence number of the |
| 186 | packet being acknowledged plus 1 modulo 64. Data packets are |
| 187 | transmitted in sequence. There may only be one outstanding |
| 188 | unacknowledged data packet at a time. The sequence numbers |
| 189 | are independent in each direction. If an acknowledgement for |
| 190 | the previous packet is received (i.e., an acknowledgement with |
| 191 | the sequence number of the packet just sent) the packet just |
| 192 | sent should be retransmitted. If no acknowledgement is |
| 193 | received within a timeout period, the packet should be |
| 194 | retransmitted. This has an unfortunate failure condition on a |
| 195 | high-latency line, as a delayed acknowledgement may lead to an |
| 196 | endless series of duplicate packets. |
| 197 | |
| 198 | DATA The actual data bytes follow. The following characters are |
| 199 | escaped inline with DLE (ASCII 020, or ^P): |
| 200 | SYN (026) DLE S |
| 201 | DLE (020) DLE D |
| 202 | ^C (003) DLE C |
| 203 | ^S (023) DLE s |
| 204 | ^Q (021) DLE q |
| 205 | The additional DLE characters are not counted in the logical |
| 206 | length stored in the TYPE_LEN and LEN1 bytes. |
| 207 | |
| 208 | CSUM1 |
| 209 | CSUM2 |
| 210 | CSUM3 |
| 211 | These bytes contain an 18 bit checksum of the complete |
| 212 | contents of the packet excluding the SEQ byte and the |
| 213 | CSUM[123] bytes. The checksum is simply the twos complement |
| 214 | addition of all the bytes treated as unsigned characters. The |
| 215 | values of the checksum bytes are: |
| 216 | CSUM1: 0x40 + ((cksum >> 12) & 0x3f) |
| 217 | CSUM2: 0x40 + ((cksum >> 6) & 0x3f) |
| 218 | CSUM3: 0x40 + (cksum & 0x3f) |
| 219 | |
| 220 | It happens that the MIPS remote debugging protocol always |
| 221 | communicates with ASCII strings. Because of this, this |
| 222 | implementation doesn't bother to handle the DLE quoting mechanism, |
| 223 | since it will never be required. */ |
| 224 | /* *INDENT-ON* */ |
| 225 | |
| 226 | |
| 227 | /* The SYN character which starts each packet. */ |
| 228 | #define SYN '\026' |
| 229 | |
| 230 | /* The 0x40 used to offset each packet (this value ensures that all of |
| 231 | the header and trailer bytes, other than SYN, are printable ASCII |
| 232 | characters). */ |
| 233 | #define HDR_OFFSET 0x40 |
| 234 | |
| 235 | /* The indices of the bytes in the packet header. */ |
| 236 | #define HDR_INDX_SYN 0 |
| 237 | #define HDR_INDX_TYPE_LEN 1 |
| 238 | #define HDR_INDX_LEN1 2 |
| 239 | #define HDR_INDX_SEQ 3 |
| 240 | #define HDR_LENGTH 4 |
| 241 | |
| 242 | /* The data/ack bit in the TYPE_LEN header byte. */ |
| 243 | #define TYPE_LEN_DA_BIT 0x20 |
| 244 | #define TYPE_LEN_DATA 0 |
| 245 | #define TYPE_LEN_ACK TYPE_LEN_DA_BIT |
| 246 | |
| 247 | /* How to compute the header bytes. */ |
| 248 | #define HDR_SET_SYN(data, len, seq) (SYN) |
| 249 | #define HDR_SET_TYPE_LEN(data, len, seq) \ |
| 250 | (HDR_OFFSET \ |
| 251 | + ((data) ? TYPE_LEN_DATA : TYPE_LEN_ACK) \ |
| 252 | + (((len) >> 6) & 0x1f)) |
| 253 | #define HDR_SET_LEN1(data, len, seq) (HDR_OFFSET + ((len) & 0x3f)) |
| 254 | #define HDR_SET_SEQ(data, len, seq) (HDR_OFFSET + (seq)) |
| 255 | |
| 256 | /* Check that a header byte is reasonable. */ |
| 257 | #define HDR_CHECK(ch) (((ch) & HDR_OFFSET) == HDR_OFFSET) |
| 258 | |
| 259 | /* Get data from the header. These macros evaluate their argument |
| 260 | multiple times. */ |
| 261 | #define HDR_IS_DATA(hdr) \ |
| 262 | (((hdr)[HDR_INDX_TYPE_LEN] & TYPE_LEN_DA_BIT) == TYPE_LEN_DATA) |
| 263 | #define HDR_GET_LEN(hdr) \ |
| 264 | ((((hdr)[HDR_INDX_TYPE_LEN] & 0x1f) << 6) + (((hdr)[HDR_INDX_LEN1] & 0x3f))) |
| 265 | #define HDR_GET_SEQ(hdr) ((unsigned int)(hdr)[HDR_INDX_SEQ] & 0x3f) |
| 266 | |
| 267 | /* The maximum data length. */ |
| 268 | #define DATA_MAXLEN 1023 |
| 269 | |
| 270 | /* The trailer offset. */ |
| 271 | #define TRLR_OFFSET HDR_OFFSET |
| 272 | |
| 273 | /* The indices of the bytes in the packet trailer. */ |
| 274 | #define TRLR_INDX_CSUM1 0 |
| 275 | #define TRLR_INDX_CSUM2 1 |
| 276 | #define TRLR_INDX_CSUM3 2 |
| 277 | #define TRLR_LENGTH 3 |
| 278 | |
| 279 | /* How to compute the trailer bytes. */ |
| 280 | #define TRLR_SET_CSUM1(cksum) (TRLR_OFFSET + (((cksum) >> 12) & 0x3f)) |
| 281 | #define TRLR_SET_CSUM2(cksum) (TRLR_OFFSET + (((cksum) >> 6) & 0x3f)) |
| 282 | #define TRLR_SET_CSUM3(cksum) (TRLR_OFFSET + (((cksum) ) & 0x3f)) |
| 283 | |
| 284 | /* Check that a trailer byte is reasonable. */ |
| 285 | #define TRLR_CHECK(ch) (((ch) & TRLR_OFFSET) == TRLR_OFFSET) |
| 286 | |
| 287 | /* Get data from the trailer. This evaluates its argument multiple |
| 288 | times. */ |
| 289 | #define TRLR_GET_CKSUM(trlr) \ |
| 290 | ((((trlr)[TRLR_INDX_CSUM1] & 0x3f) << 12) \ |
| 291 | + (((trlr)[TRLR_INDX_CSUM2] & 0x3f) << 6) \ |
| 292 | + ((trlr)[TRLR_INDX_CSUM3] & 0x3f)) |
| 293 | |
| 294 | /* The sequence number modulos. */ |
| 295 | #define SEQ_MODULOS (64) |
| 296 | |
| 297 | /* PMON commands to load from the serial port or UDP socket. */ |
| 298 | #define LOAD_CMD "load -b -s tty0\r" |
| 299 | #define LOAD_CMD_UDP "load -b -s udp\r" |
| 300 | |
| 301 | /* The target vectors for the four different remote MIPS targets. |
| 302 | These are initialized with code in _initialize_remote_mips instead |
| 303 | of static initializers, to make it easier to extend the target_ops |
| 304 | vector later. */ |
| 305 | struct target_ops mips_ops, pmon_ops, ddb_ops, lsi_ops; |
| 306 | |
| 307 | enum mips_monitor_type |
| 308 | { |
| 309 | /* IDT/SIM monitor being used: */ |
| 310 | MON_IDT, |
| 311 | /* PMON monitor being used: */ |
| 312 | MON_PMON, /* 3.0.83 [COGENT,EB,FP,NET] Algorithmics Ltd. Nov 9 1995 17:19:50 */ |
| 313 | MON_DDB, /* 2.7.473 [DDBVR4300,EL,FP,NET] Risq Modular Systems, Thu Jun 6 09:28:40 PDT 1996 */ |
| 314 | MON_LSI, /* 4.3.12 [EB,FP], LSI LOGIC Corp. Tue Feb 25 13:22:14 1997 */ |
| 315 | /* Last and unused value, for sizing vectors, etc. */ |
| 316 | MON_LAST |
| 317 | }; |
| 318 | static enum mips_monitor_type mips_monitor = MON_LAST; |
| 319 | |
| 320 | /* The monitor prompt text. If the user sets the PMON prompt |
| 321 | to some new value, the GDB `set monitor-prompt' command must also |
| 322 | be used to inform GDB about the expected prompt. Otherwise, GDB |
| 323 | will not be able to connect to PMON in mips_initialize(). |
| 324 | If the `set monitor-prompt' command is not used, the expected |
| 325 | default prompt will be set according the target: |
| 326 | target prompt |
| 327 | ----- ----- |
| 328 | pmon PMON> |
| 329 | ddb NEC010> |
| 330 | lsi PMON> |
| 331 | */ |
| 332 | static char *mips_monitor_prompt; |
| 333 | |
| 334 | /* Set to 1 if the target is open. */ |
| 335 | static int mips_is_open; |
| 336 | |
| 337 | /* Currently active target description (if mips_is_open == 1) */ |
| 338 | static struct target_ops *current_ops; |
| 339 | |
| 340 | /* Set to 1 while the connection is being initialized. */ |
| 341 | static int mips_initializing; |
| 342 | |
| 343 | /* Set to 1 while the connection is being brought down. */ |
| 344 | static int mips_exiting; |
| 345 | |
| 346 | /* The next sequence number to send. */ |
| 347 | static unsigned int mips_send_seq; |
| 348 | |
| 349 | /* The next sequence number we expect to receive. */ |
| 350 | static unsigned int mips_receive_seq; |
| 351 | |
| 352 | /* The time to wait before retransmitting a packet, in seconds. */ |
| 353 | static int mips_retransmit_wait = 3; |
| 354 | |
| 355 | /* The number of times to try retransmitting a packet before giving up. */ |
| 356 | static int mips_send_retries = 10; |
| 357 | |
| 358 | /* The number of garbage characters to accept when looking for an |
| 359 | SYN for the next packet. */ |
| 360 | static int mips_syn_garbage = 10; |
| 361 | |
| 362 | /* The time to wait for a packet, in seconds. */ |
| 363 | static int mips_receive_wait = 5; |
| 364 | |
| 365 | /* Set if we have sent a packet to the board but have not yet received |
| 366 | a reply. */ |
| 367 | static int mips_need_reply = 0; |
| 368 | |
| 369 | /* Handle used to access serial I/O stream. */ |
| 370 | static serial_t mips_desc; |
| 371 | |
| 372 | /* UDP handle used to download files to target. */ |
| 373 | static serial_t udp_desc; |
| 374 | static int udp_in_use; |
| 375 | |
| 376 | /* TFTP filename used to download files to DDB board, in the form |
| 377 | host:filename. */ |
| 378 | static char *tftp_name; /* host:filename */ |
| 379 | static char *tftp_localname; /* filename portion of above */ |
| 380 | static int tftp_in_use; |
| 381 | static FILE *tftp_file; |
| 382 | |
| 383 | /* Counts the number of times the user tried to interrupt the target (usually |
| 384 | via ^C. */ |
| 385 | static int interrupt_count; |
| 386 | |
| 387 | /* If non-zero, means that the target is running. */ |
| 388 | static int mips_wait_flag = 0; |
| 389 | |
| 390 | /* If non-zero, monitor supports breakpoint commands. */ |
| 391 | static int monitor_supports_breakpoints = 0; |
| 392 | |
| 393 | /* Data cache header. */ |
| 394 | |
| 395 | #if 0 /* not used (yet?) */ |
| 396 | static DCACHE *mips_dcache; |
| 397 | #endif |
| 398 | |
| 399 | /* Non-zero means that we've just hit a read or write watchpoint */ |
| 400 | static int hit_watchpoint; |
| 401 | |
| 402 | /* Table of breakpoints/watchpoints (used only on LSI PMON target). |
| 403 | The table is indexed by a breakpoint number, which is an integer |
| 404 | from 0 to 255 returned by the LSI PMON when a breakpoint is set. |
| 405 | */ |
| 406 | #define MAX_LSI_BREAKPOINTS 256 |
| 407 | struct lsi_breakpoint_info |
| 408 | { |
| 409 | enum break_type type; /* type of breakpoint */ |
| 410 | CORE_ADDR addr; /* address of breakpoint */ |
| 411 | int len; /* length of region being watched */ |
| 412 | unsigned long value; /* value to watch */ |
| 413 | } |
| 414 | lsi_breakpoints[MAX_LSI_BREAKPOINTS]; |
| 415 | |
| 416 | /* Error/warning codes returned by LSI PMON for breakpoint commands. |
| 417 | Warning values may be ORed together; error values may not. */ |
| 418 | #define W_WARN 0x100 /* This bit is set if the error code is a warning */ |
| 419 | #define W_MSK 0x101 /* warning: Range feature is supported via mask */ |
| 420 | #define W_VAL 0x102 /* warning: Value check is not supported in hardware */ |
| 421 | #define W_QAL 0x104 /* warning: Requested qualifiers are not supported in hardware */ |
| 422 | |
| 423 | #define E_ERR 0x200 /* This bit is set if the error code is an error */ |
| 424 | #define E_BPT 0x200 /* error: No such breakpoint number */ |
| 425 | #define E_RGE 0x201 /* error: Range is not supported */ |
| 426 | #define E_QAL 0x202 /* error: The requested qualifiers can not be used */ |
| 427 | #define E_OUT 0x203 /* error: Out of hardware resources */ |
| 428 | #define E_NON 0x204 /* error: Hardware breakpoint not supported */ |
| 429 | |
| 430 | struct lsi_error |
| 431 | { |
| 432 | int code; /* error code */ |
| 433 | char *string; /* string associated with this code */ |
| 434 | }; |
| 435 | |
| 436 | struct lsi_error lsi_warning_table[] = |
| 437 | { |
| 438 | {W_MSK, "Range feature is supported via mask"}, |
| 439 | {W_VAL, "Value check is not supported in hardware"}, |
| 440 | {W_QAL, "Requested qualifiers are not supported in hardware"}, |
| 441 | {0, NULL} |
| 442 | }; |
| 443 | |
| 444 | struct lsi_error lsi_error_table[] = |
| 445 | { |
| 446 | {E_BPT, "No such breakpoint number"}, |
| 447 | {E_RGE, "Range is not supported"}, |
| 448 | {E_QAL, "The requested qualifiers can not be used"}, |
| 449 | {E_OUT, "Out of hardware resources"}, |
| 450 | {E_NON, "Hardware breakpoint not supported"}, |
| 451 | {0, NULL} |
| 452 | }; |
| 453 | |
| 454 | /* Set to 1 with the 'set monitor-warnings' command to enable printing |
| 455 | of warnings returned by PMON when hardware breakpoints are used. */ |
| 456 | static int monitor_warnings; |
| 457 | |
| 458 | |
| 459 | static void |
| 460 | close_ports (void) |
| 461 | { |
| 462 | mips_is_open = 0; |
| 463 | SERIAL_CLOSE (mips_desc); |
| 464 | |
| 465 | if (udp_in_use) |
| 466 | { |
| 467 | SERIAL_CLOSE (udp_desc); |
| 468 | udp_in_use = 0; |
| 469 | } |
| 470 | tftp_in_use = 0; |
| 471 | } |
| 472 | |
| 473 | /* Handle low-level error that we can't recover from. Note that just |
| 474 | error()ing out from target_wait or some such low-level place will cause |
| 475 | all hell to break loose--the rest of GDB will tend to get left in an |
| 476 | inconsistent state. */ |
| 477 | |
| 478 | static NORETURN void |
| 479 | mips_error (char *string,...) |
| 480 | { |
| 481 | va_list args; |
| 482 | |
| 483 | va_start (args, string); |
| 484 | |
| 485 | target_terminal_ours (); |
| 486 | wrap_here (""); /* Force out any buffered output */ |
| 487 | gdb_flush (gdb_stdout); |
| 488 | if (error_pre_print) |
| 489 | fprintf_filtered (gdb_stderr, error_pre_print); |
| 490 | vfprintf_filtered (gdb_stderr, string, args); |
| 491 | fprintf_filtered (gdb_stderr, "\n"); |
| 492 | va_end (args); |
| 493 | gdb_flush (gdb_stderr); |
| 494 | |
| 495 | /* Clean up in such a way that mips_close won't try to talk to the |
| 496 | board (it almost surely won't work since we weren't able to talk to |
| 497 | it). */ |
| 498 | close_ports (); |
| 499 | |
| 500 | printf_unfiltered ("Ending remote MIPS debugging.\n"); |
| 501 | target_mourn_inferior (); |
| 502 | |
| 503 | return_to_top_level (RETURN_ERROR); |
| 504 | } |
| 505 | |
| 506 | /* putc_readable - print a character, displaying non-printable chars in |
| 507 | ^x notation or in hex. */ |
| 508 | |
| 509 | static void |
| 510 | fputc_readable (int ch, struct ui_file *file) |
| 511 | { |
| 512 | if (ch == '\n') |
| 513 | fputc_unfiltered ('\n', file); |
| 514 | else if (ch == '\r') |
| 515 | fprintf_unfiltered (file, "\\r"); |
| 516 | else if (ch < 0x20) /* ASCII control character */ |
| 517 | fprintf_unfiltered (file, "^%c", ch + '@'); |
| 518 | else if (ch >= 0x7f) /* non-ASCII characters (rubout or greater) */ |
| 519 | fprintf_unfiltered (file, "[%02x]", ch & 0xff); |
| 520 | else |
| 521 | fputc_unfiltered (ch, file); |
| 522 | } |
| 523 | |
| 524 | |
| 525 | /* puts_readable - print a string, displaying non-printable chars in |
| 526 | ^x notation or in hex. */ |
| 527 | |
| 528 | static void |
| 529 | fputs_readable (const char *string, struct ui_file *file) |
| 530 | { |
| 531 | int c; |
| 532 | |
| 533 | while ((c = *string++) != '\0') |
| 534 | fputc_readable (c, file); |
| 535 | } |
| 536 | |
| 537 | |
| 538 | /* Wait until STRING shows up in mips_desc. Returns 1 if successful, else 0 if |
| 539 | timed out. TIMEOUT specifies timeout value in seconds. |
| 540 | */ |
| 541 | |
| 542 | int |
| 543 | mips_expect_timeout (const char *string, int timeout) |
| 544 | { |
| 545 | const char *p = string; |
| 546 | |
| 547 | if (remote_debug) |
| 548 | { |
| 549 | fprintf_unfiltered (gdb_stdlog, "Expected \""); |
| 550 | fputs_readable (string, gdb_stdlog); |
| 551 | fprintf_unfiltered (gdb_stdlog, "\", got \""); |
| 552 | } |
| 553 | |
| 554 | immediate_quit++; |
| 555 | while (1) |
| 556 | { |
| 557 | int c; |
| 558 | |
| 559 | /* Must use SERIAL_READCHAR here cuz mips_readchar would get confused if we |
| 560 | were waiting for the mips_monitor_prompt... */ |
| 561 | |
| 562 | c = SERIAL_READCHAR (mips_desc, timeout); |
| 563 | |
| 564 | if (c == SERIAL_TIMEOUT) |
| 565 | { |
| 566 | if (remote_debug) |
| 567 | fprintf_unfiltered (gdb_stdlog, "\": FAIL\n"); |
| 568 | return 0; |
| 569 | } |
| 570 | |
| 571 | if (remote_debug) |
| 572 | fputc_readable (c, gdb_stdlog); |
| 573 | |
| 574 | if (c == *p++) |
| 575 | { |
| 576 | if (*p == '\0') |
| 577 | { |
| 578 | immediate_quit--; |
| 579 | if (remote_debug) |
| 580 | fprintf_unfiltered (gdb_stdlog, "\": OK\n"); |
| 581 | return 1; |
| 582 | } |
| 583 | } |
| 584 | else |
| 585 | { |
| 586 | p = string; |
| 587 | if (c == *p) |
| 588 | p++; |
| 589 | } |
| 590 | } |
| 591 | } |
| 592 | |
| 593 | /* Wait until STRING shows up in mips_desc. Returns 1 if successful, else 0 if |
| 594 | timed out. The timeout value is hard-coded to 2 seconds. Use |
| 595 | mips_expect_timeout if a different timeout value is needed. |
| 596 | */ |
| 597 | |
| 598 | int |
| 599 | mips_expect (const char *string) |
| 600 | { |
| 601 | return mips_expect_timeout (string, remote_timeout); |
| 602 | } |
| 603 | |
| 604 | /* Read the required number of characters into the given buffer (which |
| 605 | is assumed to be large enough). The only failure is a timeout. */ |
| 606 | int |
| 607 | mips_getstring (char *string, int n) |
| 608 | { |
| 609 | char *p = string; |
| 610 | int c; |
| 611 | |
| 612 | immediate_quit++; |
| 613 | while (n > 0) |
| 614 | { |
| 615 | c = SERIAL_READCHAR (mips_desc, remote_timeout); |
| 616 | |
| 617 | if (c == SERIAL_TIMEOUT) |
| 618 | { |
| 619 | fprintf_unfiltered (gdb_stderr, |
| 620 | "Failed to read %d characters from target (TIMEOUT)\n", n); |
| 621 | immediate_quit--; |
| 622 | return 0; |
| 623 | } |
| 624 | |
| 625 | *p++ = c; |
| 626 | n--; |
| 627 | } |
| 628 | |
| 629 | immediate_quit--; |
| 630 | return 1; |
| 631 | } |
| 632 | |
| 633 | /* Read a character from the remote, aborting on error. Returns |
| 634 | SERIAL_TIMEOUT on timeout (since that's what SERIAL_READCHAR |
| 635 | returns). FIXME: If we see the string mips_monitor_prompt from |
| 636 | the board, then we are debugging on the main console port, and we |
| 637 | have somehow dropped out of remote debugging mode. In this case, |
| 638 | we automatically go back in to remote debugging mode. This is a |
| 639 | hack, put in because I can't find any way for a program running on |
| 640 | the remote board to terminate without also ending remote debugging |
| 641 | mode. I assume users won't have any trouble with this; for one |
| 642 | thing, the IDT documentation generally assumes that the remote |
| 643 | debugging port is not the console port. This is, however, very |
| 644 | convenient for DejaGnu when you only have one connected serial |
| 645 | port. */ |
| 646 | |
| 647 | static int |
| 648 | mips_readchar (int timeout) |
| 649 | { |
| 650 | int ch; |
| 651 | static int state = 0; |
| 652 | int mips_monitor_prompt_len = strlen (mips_monitor_prompt); |
| 653 | |
| 654 | { |
| 655 | int i; |
| 656 | |
| 657 | i = timeout; |
| 658 | if (i == -1 && watchdog > 0) |
| 659 | i = watchdog; |
| 660 | } |
| 661 | |
| 662 | if (state == mips_monitor_prompt_len) |
| 663 | timeout = 1; |
| 664 | ch = SERIAL_READCHAR (mips_desc, timeout); |
| 665 | |
| 666 | if (ch == SERIAL_TIMEOUT && timeout == -1) /* Watchdog went off */ |
| 667 | { |
| 668 | target_mourn_inferior (); |
| 669 | error ("Watchdog has expired. Target detached.\n"); |
| 670 | } |
| 671 | |
| 672 | if (ch == SERIAL_EOF) |
| 673 | mips_error ("End of file from remote"); |
| 674 | if (ch == SERIAL_ERROR) |
| 675 | mips_error ("Error reading from remote: %s", safe_strerror (errno)); |
| 676 | if (remote_debug > 1) |
| 677 | { |
| 678 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 679 | target_wait, and I think this might be called from there. */ |
| 680 | if (ch != SERIAL_TIMEOUT) |
| 681 | fprintf_unfiltered (gdb_stdlog, "Read '%c' %d 0x%x\n", ch, ch, ch); |
| 682 | else |
| 683 | fprintf_unfiltered (gdb_stdlog, "Timed out in read\n"); |
| 684 | } |
| 685 | |
| 686 | /* If we have seen mips_monitor_prompt and we either time out, or |
| 687 | we see a @ (which was echoed from a packet we sent), reset the |
| 688 | board as described above. The first character in a packet after |
| 689 | the SYN (which is not echoed) is always an @ unless the packet is |
| 690 | more than 64 characters long, which ours never are. */ |
| 691 | if ((ch == SERIAL_TIMEOUT || ch == '@') |
| 692 | && state == mips_monitor_prompt_len |
| 693 | && !mips_initializing |
| 694 | && !mips_exiting) |
| 695 | { |
| 696 | if (remote_debug > 0) |
| 697 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 698 | target_wait, and I think this might be called from there. */ |
| 699 | fprintf_unfiltered (gdb_stdlog, "Reinitializing MIPS debugging mode\n"); |
| 700 | |
| 701 | mips_need_reply = 0; |
| 702 | mips_initialize (); |
| 703 | |
| 704 | state = 0; |
| 705 | |
| 706 | /* At this point, about the only thing we can do is abort the command |
| 707 | in progress and get back to command level as quickly as possible. */ |
| 708 | |
| 709 | error ("Remote board reset, debug protocol re-initialized."); |
| 710 | } |
| 711 | |
| 712 | if (ch == mips_monitor_prompt[state]) |
| 713 | ++state; |
| 714 | else |
| 715 | state = 0; |
| 716 | |
| 717 | return ch; |
| 718 | } |
| 719 | |
| 720 | /* Get a packet header, putting the data in the supplied buffer. |
| 721 | PGARBAGE is a pointer to the number of garbage characters received |
| 722 | so far. CH is the last character received. Returns 0 for success, |
| 723 | or -1 for timeout. */ |
| 724 | |
| 725 | static int |
| 726 | mips_receive_header (unsigned char *hdr, int *pgarbage, int ch, int timeout) |
| 727 | { |
| 728 | int i; |
| 729 | |
| 730 | while (1) |
| 731 | { |
| 732 | /* Wait for a SYN. mips_syn_garbage is intended to prevent |
| 733 | sitting here indefinitely if the board sends us one garbage |
| 734 | character per second. ch may already have a value from the |
| 735 | last time through the loop. */ |
| 736 | while (ch != SYN) |
| 737 | { |
| 738 | ch = mips_readchar (timeout); |
| 739 | if (ch == SERIAL_TIMEOUT) |
| 740 | return -1; |
| 741 | if (ch != SYN) |
| 742 | { |
| 743 | /* Printing the character here lets the user of gdb see |
| 744 | what the program is outputting, if the debugging is |
| 745 | being done on the console port. Don't use _filtered: |
| 746 | we can't deal with a QUIT out of target_wait and |
| 747 | buffered target output confuses the user. */ |
| 748 | if (!mips_initializing || remote_debug > 0) |
| 749 | { |
| 750 | if (isprint (ch) || isspace (ch)) |
| 751 | { |
| 752 | fputc_unfiltered (ch, gdb_stdtarg); |
| 753 | } |
| 754 | else |
| 755 | { |
| 756 | fputc_readable (ch, gdb_stdtarg); |
| 757 | } |
| 758 | gdb_flush (gdb_stdtarg); |
| 759 | } |
| 760 | |
| 761 | /* Only count unprintable characters. */ |
| 762 | if (! (isprint (ch) || isspace (ch))) |
| 763 | (*pgarbage) += 1; |
| 764 | |
| 765 | if (mips_syn_garbage > 0 |
| 766 | && *pgarbage > mips_syn_garbage) |
| 767 | mips_error ("Debug protocol failure: more than %d characters before a sync.", |
| 768 | mips_syn_garbage); |
| 769 | } |
| 770 | } |
| 771 | |
| 772 | /* Get the packet header following the SYN. */ |
| 773 | for (i = 1; i < HDR_LENGTH; i++) |
| 774 | { |
| 775 | ch = mips_readchar (timeout); |
| 776 | if (ch == SERIAL_TIMEOUT) |
| 777 | return -1; |
| 778 | /* Make sure this is a header byte. */ |
| 779 | if (ch == SYN || !HDR_CHECK (ch)) |
| 780 | break; |
| 781 | |
| 782 | hdr[i] = ch; |
| 783 | } |
| 784 | |
| 785 | /* If we got the complete header, we can return. Otherwise we |
| 786 | loop around and keep looking for SYN. */ |
| 787 | if (i >= HDR_LENGTH) |
| 788 | return 0; |
| 789 | } |
| 790 | } |
| 791 | |
| 792 | /* Get a packet header, putting the data in the supplied buffer. |
| 793 | PGARBAGE is a pointer to the number of garbage characters received |
| 794 | so far. The last character read is returned in *PCH. Returns 0 |
| 795 | for success, -1 for timeout, -2 for error. */ |
| 796 | |
| 797 | static int |
| 798 | mips_receive_trailer (unsigned char *trlr, int *pgarbage, int *pch, int timeout) |
| 799 | { |
| 800 | int i; |
| 801 | int ch; |
| 802 | |
| 803 | for (i = 0; i < TRLR_LENGTH; i++) |
| 804 | { |
| 805 | ch = mips_readchar (timeout); |
| 806 | *pch = ch; |
| 807 | if (ch == SERIAL_TIMEOUT) |
| 808 | return -1; |
| 809 | if (!TRLR_CHECK (ch)) |
| 810 | return -2; |
| 811 | trlr[i] = ch; |
| 812 | } |
| 813 | return 0; |
| 814 | } |
| 815 | |
| 816 | /* Get the checksum of a packet. HDR points to the packet header. |
| 817 | DATA points to the packet data. LEN is the length of DATA. */ |
| 818 | |
| 819 | static int |
| 820 | mips_cksum (const unsigned char *hdr, const unsigned char *data, int len) |
| 821 | { |
| 822 | register const unsigned char *p; |
| 823 | register int c; |
| 824 | register int cksum; |
| 825 | |
| 826 | cksum = 0; |
| 827 | |
| 828 | /* The initial SYN is not included in the checksum. */ |
| 829 | c = HDR_LENGTH - 1; |
| 830 | p = hdr + 1; |
| 831 | while (c-- != 0) |
| 832 | cksum += *p++; |
| 833 | |
| 834 | c = len; |
| 835 | p = data; |
| 836 | while (c-- != 0) |
| 837 | cksum += *p++; |
| 838 | |
| 839 | return cksum; |
| 840 | } |
| 841 | |
| 842 | /* Send a packet containing the given ASCII string. */ |
| 843 | |
| 844 | static void |
| 845 | mips_send_packet (const char *s, int get_ack) |
| 846 | { |
| 847 | /* unsigned */ int len; |
| 848 | unsigned char *packet; |
| 849 | register int cksum; |
| 850 | int try; |
| 851 | |
| 852 | len = strlen (s); |
| 853 | if (len > DATA_MAXLEN) |
| 854 | mips_error ("MIPS protocol data packet too long: %s", s); |
| 855 | |
| 856 | packet = (unsigned char *) alloca (HDR_LENGTH + len + TRLR_LENGTH + 1); |
| 857 | |
| 858 | packet[HDR_INDX_SYN] = HDR_SET_SYN (1, len, mips_send_seq); |
| 859 | packet[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (1, len, mips_send_seq); |
| 860 | packet[HDR_INDX_LEN1] = HDR_SET_LEN1 (1, len, mips_send_seq); |
| 861 | packet[HDR_INDX_SEQ] = HDR_SET_SEQ (1, len, mips_send_seq); |
| 862 | |
| 863 | memcpy (packet + HDR_LENGTH, s, len); |
| 864 | |
| 865 | cksum = mips_cksum (packet, packet + HDR_LENGTH, len); |
| 866 | packet[HDR_LENGTH + len + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum); |
| 867 | packet[HDR_LENGTH + len + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum); |
| 868 | packet[HDR_LENGTH + len + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum); |
| 869 | |
| 870 | /* Increment the sequence number. This will set mips_send_seq to |
| 871 | the sequence number we expect in the acknowledgement. */ |
| 872 | mips_send_seq = (mips_send_seq + 1) % SEQ_MODULOS; |
| 873 | |
| 874 | /* We can only have one outstanding data packet, so we just wait for |
| 875 | the acknowledgement here. Keep retransmitting the packet until |
| 876 | we get one, or until we've tried too many times. */ |
| 877 | for (try = 0; try < mips_send_retries; try++) |
| 878 | { |
| 879 | int garbage; |
| 880 | int ch; |
| 881 | |
| 882 | if (remote_debug > 0) |
| 883 | { |
| 884 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 885 | target_wait, and I think this might be called from there. */ |
| 886 | packet[HDR_LENGTH + len + TRLR_LENGTH] = '\0'; |
| 887 | fprintf_unfiltered (gdb_stdlog, "Writing \"%s\"\n", packet + 1); |
| 888 | } |
| 889 | |
| 890 | if (SERIAL_WRITE (mips_desc, packet, |
| 891 | HDR_LENGTH + len + TRLR_LENGTH) != 0) |
| 892 | mips_error ("write to target failed: %s", safe_strerror (errno)); |
| 893 | |
| 894 | if (!get_ack) |
| 895 | return; |
| 896 | |
| 897 | garbage = 0; |
| 898 | ch = 0; |
| 899 | while (1) |
| 900 | { |
| 901 | unsigned char hdr[HDR_LENGTH + 1]; |
| 902 | unsigned char trlr[TRLR_LENGTH + 1]; |
| 903 | int err; |
| 904 | unsigned int seq; |
| 905 | |
| 906 | /* Get the packet header. If we time out, resend the data |
| 907 | packet. */ |
| 908 | err = mips_receive_header (hdr, &garbage, ch, mips_retransmit_wait); |
| 909 | if (err != 0) |
| 910 | break; |
| 911 | |
| 912 | ch = 0; |
| 913 | |
| 914 | /* If we get a data packet, assume it is a duplicate and |
| 915 | ignore it. FIXME: If the acknowledgement is lost, this |
| 916 | data packet may be the packet the remote sends after the |
| 917 | acknowledgement. */ |
| 918 | if (HDR_IS_DATA (hdr)) |
| 919 | { |
| 920 | int i; |
| 921 | |
| 922 | /* Ignore any errors raised whilst attempting to ignore |
| 923 | packet. */ |
| 924 | |
| 925 | len = HDR_GET_LEN (hdr); |
| 926 | |
| 927 | for (i = 0; i < len; i++) |
| 928 | { |
| 929 | int rch; |
| 930 | |
| 931 | rch = mips_readchar (remote_timeout); |
| 932 | if (rch == SYN) |
| 933 | { |
| 934 | ch = SYN; |
| 935 | break; |
| 936 | } |
| 937 | if (rch == SERIAL_TIMEOUT) |
| 938 | break; |
| 939 | /* ignore the character */ |
| 940 | } |
| 941 | |
| 942 | if (i == len) |
| 943 | (void) mips_receive_trailer (trlr, &garbage, &ch, |
| 944 | remote_timeout); |
| 945 | |
| 946 | /* We don't bother checking the checksum, or providing an |
| 947 | ACK to the packet. */ |
| 948 | continue; |
| 949 | } |
| 950 | |
| 951 | /* If the length is not 0, this is a garbled packet. */ |
| 952 | if (HDR_GET_LEN (hdr) != 0) |
| 953 | continue; |
| 954 | |
| 955 | /* Get the packet trailer. */ |
| 956 | err = mips_receive_trailer (trlr, &garbage, &ch, |
| 957 | mips_retransmit_wait); |
| 958 | |
| 959 | /* If we timed out, resend the data packet. */ |
| 960 | if (err == -1) |
| 961 | break; |
| 962 | |
| 963 | /* If we got a bad character, reread the header. */ |
| 964 | if (err != 0) |
| 965 | continue; |
| 966 | |
| 967 | /* If the checksum does not match the trailer checksum, this |
| 968 | is a bad packet; ignore it. */ |
| 969 | if (mips_cksum (hdr, (unsigned char *) NULL, 0) |
| 970 | != TRLR_GET_CKSUM (trlr)) |
| 971 | continue; |
| 972 | |
| 973 | if (remote_debug > 0) |
| 974 | { |
| 975 | hdr[HDR_LENGTH] = '\0'; |
| 976 | trlr[TRLR_LENGTH] = '\0'; |
| 977 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 978 | target_wait, and I think this might be called from there. */ |
| 979 | fprintf_unfiltered (gdb_stdlog, "Got ack %d \"%s%s\"\n", |
| 980 | HDR_GET_SEQ (hdr), hdr + 1, trlr); |
| 981 | } |
| 982 | |
| 983 | /* If this ack is for the current packet, we're done. */ |
| 984 | seq = HDR_GET_SEQ (hdr); |
| 985 | if (seq == mips_send_seq) |
| 986 | return; |
| 987 | |
| 988 | /* If this ack is for the last packet, resend the current |
| 989 | packet. */ |
| 990 | if ((seq + 1) % SEQ_MODULOS == mips_send_seq) |
| 991 | break; |
| 992 | |
| 993 | /* Otherwise this is a bad ack; ignore it. Increment the |
| 994 | garbage count to ensure that we do not stay in this loop |
| 995 | forever. */ |
| 996 | ++garbage; |
| 997 | } |
| 998 | } |
| 999 | |
| 1000 | mips_error ("Remote did not acknowledge packet"); |
| 1001 | } |
| 1002 | |
| 1003 | /* Receive and acknowledge a packet, returning the data in BUFF (which |
| 1004 | should be DATA_MAXLEN + 1 bytes). The protocol documentation |
| 1005 | implies that only the sender retransmits packets, so this code just |
| 1006 | waits silently for a packet. It returns the length of the received |
| 1007 | packet. If THROW_ERROR is nonzero, call error() on errors. If not, |
| 1008 | don't print an error message and return -1. */ |
| 1009 | |
| 1010 | static int |
| 1011 | mips_receive_packet (char *buff, int throw_error, int timeout) |
| 1012 | { |
| 1013 | int ch; |
| 1014 | int garbage; |
| 1015 | int len; |
| 1016 | unsigned char ack[HDR_LENGTH + TRLR_LENGTH + 1]; |
| 1017 | int cksum; |
| 1018 | |
| 1019 | ch = 0; |
| 1020 | garbage = 0; |
| 1021 | while (1) |
| 1022 | { |
| 1023 | unsigned char hdr[HDR_LENGTH]; |
| 1024 | unsigned char trlr[TRLR_LENGTH]; |
| 1025 | int i; |
| 1026 | int err; |
| 1027 | |
| 1028 | if (mips_receive_header (hdr, &garbage, ch, timeout) != 0) |
| 1029 | { |
| 1030 | if (throw_error) |
| 1031 | mips_error ("Timed out waiting for remote packet"); |
| 1032 | else |
| 1033 | return -1; |
| 1034 | } |
| 1035 | |
| 1036 | ch = 0; |
| 1037 | |
| 1038 | /* An acknowledgement is probably a duplicate; ignore it. */ |
| 1039 | if (!HDR_IS_DATA (hdr)) |
| 1040 | { |
| 1041 | len = HDR_GET_LEN (hdr); |
| 1042 | /* Check if the length is valid for an ACK, we may aswell |
| 1043 | try and read the remainder of the packet: */ |
| 1044 | if (len == 0) |
| 1045 | { |
| 1046 | /* Ignore the error condition, since we are going to |
| 1047 | ignore the packet anyway. */ |
| 1048 | (void) mips_receive_trailer (trlr, &garbage, &ch, timeout); |
| 1049 | } |
| 1050 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 1051 | target_wait, and I think this might be called from there. */ |
| 1052 | if (remote_debug > 0) |
| 1053 | fprintf_unfiltered (gdb_stdlog, "Ignoring unexpected ACK\n"); |
| 1054 | continue; |
| 1055 | } |
| 1056 | |
| 1057 | len = HDR_GET_LEN (hdr); |
| 1058 | for (i = 0; i < len; i++) |
| 1059 | { |
| 1060 | int rch; |
| 1061 | |
| 1062 | rch = mips_readchar (timeout); |
| 1063 | if (rch == SYN) |
| 1064 | { |
| 1065 | ch = SYN; |
| 1066 | break; |
| 1067 | } |
| 1068 | if (rch == SERIAL_TIMEOUT) |
| 1069 | { |
| 1070 | if (throw_error) |
| 1071 | mips_error ("Timed out waiting for remote packet"); |
| 1072 | else |
| 1073 | return -1; |
| 1074 | } |
| 1075 | buff[i] = rch; |
| 1076 | } |
| 1077 | |
| 1078 | if (i < len) |
| 1079 | { |
| 1080 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 1081 | target_wait, and I think this might be called from there. */ |
| 1082 | if (remote_debug > 0) |
| 1083 | fprintf_unfiltered (gdb_stdlog, |
| 1084 | "Got new SYN after %d chars (wanted %d)\n", |
| 1085 | i, len); |
| 1086 | continue; |
| 1087 | } |
| 1088 | |
| 1089 | err = mips_receive_trailer (trlr, &garbage, &ch, timeout); |
| 1090 | if (err == -1) |
| 1091 | { |
| 1092 | if (throw_error) |
| 1093 | mips_error ("Timed out waiting for packet"); |
| 1094 | else |
| 1095 | return -1; |
| 1096 | } |
| 1097 | if (err == -2) |
| 1098 | { |
| 1099 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 1100 | target_wait, and I think this might be called from there. */ |
| 1101 | if (remote_debug > 0) |
| 1102 | fprintf_unfiltered (gdb_stdlog, "Got SYN when wanted trailer\n"); |
| 1103 | continue; |
| 1104 | } |
| 1105 | |
| 1106 | /* If this is the wrong sequence number, ignore it. */ |
| 1107 | if (HDR_GET_SEQ (hdr) != mips_receive_seq) |
| 1108 | { |
| 1109 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 1110 | target_wait, and I think this might be called from there. */ |
| 1111 | if (remote_debug > 0) |
| 1112 | fprintf_unfiltered (gdb_stdlog, |
| 1113 | "Ignoring sequence number %d (want %d)\n", |
| 1114 | HDR_GET_SEQ (hdr), mips_receive_seq); |
| 1115 | continue; |
| 1116 | } |
| 1117 | |
| 1118 | if (mips_cksum (hdr, buff, len) == TRLR_GET_CKSUM (trlr)) |
| 1119 | break; |
| 1120 | |
| 1121 | if (remote_debug > 0) |
| 1122 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 1123 | target_wait, and I think this might be called from there. */ |
| 1124 | printf_unfiltered ("Bad checksum; data %d, trailer %d\n", |
| 1125 | mips_cksum (hdr, buff, len), |
| 1126 | TRLR_GET_CKSUM (trlr)); |
| 1127 | |
| 1128 | /* The checksum failed. Send an acknowledgement for the |
| 1129 | previous packet to tell the remote to resend the packet. */ |
| 1130 | ack[HDR_INDX_SYN] = HDR_SET_SYN (0, 0, mips_receive_seq); |
| 1131 | ack[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq); |
| 1132 | ack[HDR_INDX_LEN1] = HDR_SET_LEN1 (0, 0, mips_receive_seq); |
| 1133 | ack[HDR_INDX_SEQ] = HDR_SET_SEQ (0, 0, mips_receive_seq); |
| 1134 | |
| 1135 | cksum = mips_cksum (ack, (unsigned char *) NULL, 0); |
| 1136 | |
| 1137 | ack[HDR_LENGTH + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum); |
| 1138 | ack[HDR_LENGTH + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum); |
| 1139 | ack[HDR_LENGTH + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum); |
| 1140 | |
| 1141 | if (remote_debug > 0) |
| 1142 | { |
| 1143 | ack[HDR_LENGTH + TRLR_LENGTH] = '\0'; |
| 1144 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 1145 | target_wait, and I think this might be called from there. */ |
| 1146 | printf_unfiltered ("Writing ack %d \"%s\"\n", mips_receive_seq, |
| 1147 | ack + 1); |
| 1148 | } |
| 1149 | |
| 1150 | if (SERIAL_WRITE (mips_desc, ack, HDR_LENGTH + TRLR_LENGTH) != 0) |
| 1151 | { |
| 1152 | if (throw_error) |
| 1153 | mips_error ("write to target failed: %s", safe_strerror (errno)); |
| 1154 | else |
| 1155 | return -1; |
| 1156 | } |
| 1157 | } |
| 1158 | |
| 1159 | if (remote_debug > 0) |
| 1160 | { |
| 1161 | buff[len] = '\0'; |
| 1162 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 1163 | target_wait, and I think this might be called from there. */ |
| 1164 | printf_unfiltered ("Got packet \"%s\"\n", buff); |
| 1165 | } |
| 1166 | |
| 1167 | /* We got the packet. Send an acknowledgement. */ |
| 1168 | mips_receive_seq = (mips_receive_seq + 1) % SEQ_MODULOS; |
| 1169 | |
| 1170 | ack[HDR_INDX_SYN] = HDR_SET_SYN (0, 0, mips_receive_seq); |
| 1171 | ack[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq); |
| 1172 | ack[HDR_INDX_LEN1] = HDR_SET_LEN1 (0, 0, mips_receive_seq); |
| 1173 | ack[HDR_INDX_SEQ] = HDR_SET_SEQ (0, 0, mips_receive_seq); |
| 1174 | |
| 1175 | cksum = mips_cksum (ack, (unsigned char *) NULL, 0); |
| 1176 | |
| 1177 | ack[HDR_LENGTH + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum); |
| 1178 | ack[HDR_LENGTH + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum); |
| 1179 | ack[HDR_LENGTH + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum); |
| 1180 | |
| 1181 | if (remote_debug > 0) |
| 1182 | { |
| 1183 | ack[HDR_LENGTH + TRLR_LENGTH] = '\0'; |
| 1184 | /* Don't use _filtered; we can't deal with a QUIT out of |
| 1185 | target_wait, and I think this might be called from there. */ |
| 1186 | printf_unfiltered ("Writing ack %d \"%s\"\n", mips_receive_seq, |
| 1187 | ack + 1); |
| 1188 | } |
| 1189 | |
| 1190 | if (SERIAL_WRITE (mips_desc, ack, HDR_LENGTH + TRLR_LENGTH) != 0) |
| 1191 | { |
| 1192 | if (throw_error) |
| 1193 | mips_error ("write to target failed: %s", safe_strerror (errno)); |
| 1194 | else |
| 1195 | return -1; |
| 1196 | } |
| 1197 | |
| 1198 | return len; |
| 1199 | } |
| 1200 | \f |
| 1201 | /* Optionally send a request to the remote system and optionally wait |
| 1202 | for the reply. This implements the remote debugging protocol, |
| 1203 | which is built on top of the packet protocol defined above. Each |
| 1204 | request has an ADDR argument and a DATA argument. The following |
| 1205 | requests are defined: |
| 1206 | |
| 1207 | \0 don't send a request; just wait for a reply |
| 1208 | i read word from instruction space at ADDR |
| 1209 | d read word from data space at ADDR |
| 1210 | I write DATA to instruction space at ADDR |
| 1211 | D write DATA to data space at ADDR |
| 1212 | r read register number ADDR |
| 1213 | R set register number ADDR to value DATA |
| 1214 | c continue execution (if ADDR != 1, set pc to ADDR) |
| 1215 | s single step (if ADDR != 1, set pc to ADDR) |
| 1216 | |
| 1217 | The read requests return the value requested. The write requests |
| 1218 | return the previous value in the changed location. The execution |
| 1219 | requests return a UNIX wait value (the approximate signal which |
| 1220 | caused execution to stop is in the upper eight bits). |
| 1221 | |
| 1222 | If PERR is not NULL, this function waits for a reply. If an error |
| 1223 | occurs, it sets *PERR to 1 and sets errno according to what the |
| 1224 | target board reports. */ |
| 1225 | |
| 1226 | static ULONGEST |
| 1227 | mips_request (int cmd, |
| 1228 | ULONGEST addr, |
| 1229 | ULONGEST data, |
| 1230 | int *perr, |
| 1231 | int timeout, |
| 1232 | char *buff) |
| 1233 | { |
| 1234 | char myBuff[DATA_MAXLEN + 1]; |
| 1235 | int len; |
| 1236 | int rpid; |
| 1237 | char rcmd; |
| 1238 | int rerrflg; |
| 1239 | unsigned long rresponse; |
| 1240 | |
| 1241 | if (buff == (char *) NULL) |
| 1242 | buff = myBuff; |
| 1243 | |
| 1244 | if (cmd != '\0') |
| 1245 | { |
| 1246 | if (mips_need_reply) |
| 1247 | internal_error ("mips_request: Trying to send command before reply"); |
| 1248 | sprintf (buff, "0x0 %c 0x%s 0x%s", cmd, paddr_nz (addr), paddr_nz (data)); |
| 1249 | mips_send_packet (buff, 1); |
| 1250 | mips_need_reply = 1; |
| 1251 | } |
| 1252 | |
| 1253 | if (perr == (int *) NULL) |
| 1254 | return 0; |
| 1255 | |
| 1256 | if (!mips_need_reply) |
| 1257 | internal_error ("mips_request: Trying to get reply before command"); |
| 1258 | |
| 1259 | mips_need_reply = 0; |
| 1260 | |
| 1261 | len = mips_receive_packet (buff, 1, timeout); |
| 1262 | buff[len] = '\0'; |
| 1263 | |
| 1264 | if (sscanf (buff, "0x%x %c 0x%x 0x%lx", |
| 1265 | &rpid, &rcmd, &rerrflg, &rresponse) != 4 |
| 1266 | || (cmd != '\0' && rcmd != cmd)) |
| 1267 | mips_error ("Bad response from remote board"); |
| 1268 | |
| 1269 | if (rerrflg != 0) |
| 1270 | { |
| 1271 | *perr = 1; |
| 1272 | |
| 1273 | /* FIXME: This will returns MIPS errno numbers, which may or may |
| 1274 | not be the same as errno values used on other systems. If |
| 1275 | they stick to common errno values, they will be the same, but |
| 1276 | if they don't, they must be translated. */ |
| 1277 | errno = rresponse; |
| 1278 | |
| 1279 | return 0; |
| 1280 | } |
| 1281 | |
| 1282 | *perr = 0; |
| 1283 | return rresponse; |
| 1284 | } |
| 1285 | |
| 1286 | static void |
| 1287 | mips_initialize_cleanups (PTR arg) |
| 1288 | { |
| 1289 | mips_initializing = 0; |
| 1290 | } |
| 1291 | |
| 1292 | static void |
| 1293 | mips_exit_cleanups (PTR arg) |
| 1294 | { |
| 1295 | mips_exiting = 0; |
| 1296 | } |
| 1297 | |
| 1298 | static void |
| 1299 | mips_send_command (const char *cmd, int prompt) |
| 1300 | { |
| 1301 | SERIAL_WRITE (mips_desc, cmd, strlen (cmd)); |
| 1302 | mips_expect (cmd); |
| 1303 | mips_expect ("\n"); |
| 1304 | if (prompt) |
| 1305 | mips_expect (mips_monitor_prompt); |
| 1306 | } |
| 1307 | |
| 1308 | /* Enter remote (dbx) debug mode: */ |
| 1309 | static void |
| 1310 | mips_enter_debug (void) |
| 1311 | { |
| 1312 | /* Reset the sequence numbers, ready for the new debug sequence: */ |
| 1313 | mips_send_seq = 0; |
| 1314 | mips_receive_seq = 0; |
| 1315 | |
| 1316 | if (mips_monitor != MON_IDT) |
| 1317 | mips_send_command ("debug\r", 0); |
| 1318 | else /* assume IDT monitor by default */ |
| 1319 | mips_send_command ("db tty0\r", 0); |
| 1320 | |
| 1321 | sleep (1); |
| 1322 | SERIAL_WRITE (mips_desc, "\r", sizeof "\r" - 1); |
| 1323 | |
| 1324 | /* We don't need to absorb any spurious characters here, since the |
| 1325 | mips_receive_header will eat up a reasonable number of characters |
| 1326 | whilst looking for the SYN, however this avoids the "garbage" |
| 1327 | being displayed to the user. */ |
| 1328 | if (mips_monitor != MON_IDT) |
| 1329 | mips_expect ("\r"); |
| 1330 | |
| 1331 | { |
| 1332 | char buff[DATA_MAXLEN + 1]; |
| 1333 | if (mips_receive_packet (buff, 1, 3) < 0) |
| 1334 | mips_error ("Failed to initialize (didn't receive packet)."); |
| 1335 | } |
| 1336 | } |
| 1337 | |
| 1338 | /* Exit remote (dbx) debug mode, returning to the monitor prompt: */ |
| 1339 | static int |
| 1340 | mips_exit_debug (void) |
| 1341 | { |
| 1342 | int err; |
| 1343 | struct cleanup *old_cleanups = make_cleanup (mips_exit_cleanups, NULL); |
| 1344 | |
| 1345 | mips_exiting = 1; |
| 1346 | |
| 1347 | if (mips_monitor != MON_IDT) |
| 1348 | { |
| 1349 | /* The DDB (NEC) and MiniRISC (LSI) versions of PMON exit immediately, |
| 1350 | so we do not get a reply to this command: */ |
| 1351 | mips_request ('x', 0, 0, NULL, mips_receive_wait, NULL); |
| 1352 | mips_need_reply = 0; |
| 1353 | if (!mips_expect (" break!")) |
| 1354 | return -1; |
| 1355 | } |
| 1356 | else |
| 1357 | mips_request ('x', 0, 0, &err, mips_receive_wait, NULL); |
| 1358 | |
| 1359 | if (!mips_expect (mips_monitor_prompt)) |
| 1360 | return -1; |
| 1361 | |
| 1362 | do_cleanups (old_cleanups); |
| 1363 | |
| 1364 | return 0; |
| 1365 | } |
| 1366 | |
| 1367 | /* Initialize a new connection to the MIPS board, and make sure we are |
| 1368 | really connected. */ |
| 1369 | |
| 1370 | static void |
| 1371 | mips_initialize (void) |
| 1372 | { |
| 1373 | int err; |
| 1374 | struct cleanup *old_cleanups = make_cleanup (mips_initialize_cleanups, NULL); |
| 1375 | int j; |
| 1376 | |
| 1377 | /* What is this code doing here? I don't see any way it can happen, and |
| 1378 | it might mean mips_initializing didn't get cleared properly. |
| 1379 | So I'll make it a warning. */ |
| 1380 | |
| 1381 | if (mips_initializing) |
| 1382 | { |
| 1383 | warning ("internal error: mips_initialize called twice"); |
| 1384 | return; |
| 1385 | } |
| 1386 | |
| 1387 | mips_wait_flag = 0; |
| 1388 | mips_initializing = 1; |
| 1389 | |
| 1390 | /* At this point, the packit protocol isn't responding. We'll try getting |
| 1391 | into the monitor, and restarting the protocol. */ |
| 1392 | |
| 1393 | /* Force the system into the monitor. After this we *should* be at |
| 1394 | the mips_monitor_prompt. */ |
| 1395 | if (mips_monitor != MON_IDT) |
| 1396 | j = 0; /* start by checking if we are already at the prompt */ |
| 1397 | else |
| 1398 | j = 1; /* start by sending a break */ |
| 1399 | for (; j <= 4; j++) |
| 1400 | { |
| 1401 | switch (j) |
| 1402 | { |
| 1403 | case 0: /* First, try sending a CR */ |
| 1404 | SERIAL_FLUSH_INPUT (mips_desc); |
| 1405 | SERIAL_WRITE (mips_desc, "\r", 1); |
| 1406 | break; |
| 1407 | case 1: /* First, try sending a break */ |
| 1408 | SERIAL_SEND_BREAK (mips_desc); |
| 1409 | break; |
| 1410 | case 2: /* Then, try a ^C */ |
| 1411 | SERIAL_WRITE (mips_desc, "\003", 1); |
| 1412 | break; |
| 1413 | case 3: /* Then, try escaping from download */ |
| 1414 | { |
| 1415 | if (mips_monitor != MON_IDT) |
| 1416 | { |
| 1417 | char tbuff[7]; |
| 1418 | |
| 1419 | /* We shouldn't need to send multiple termination |
| 1420 | sequences, since the target performs line (or |
| 1421 | block) reads, and then processes those |
| 1422 | packets. In-case we were downloading a large packet |
| 1423 | we flush the output buffer before inserting a |
| 1424 | termination sequence. */ |
| 1425 | SERIAL_FLUSH_OUTPUT (mips_desc); |
| 1426 | sprintf (tbuff, "\r/E/E\r"); |
| 1427 | SERIAL_WRITE (mips_desc, tbuff, 6); |
| 1428 | } |
| 1429 | else |
| 1430 | { |
| 1431 | char srec[10]; |
| 1432 | int i; |
| 1433 | |
| 1434 | /* We are possibly in binary download mode, having |
| 1435 | aborted in the middle of an S-record. ^C won't |
| 1436 | work because of binary mode. The only reliable way |
| 1437 | out is to send enough termination packets (8 bytes) |
| 1438 | to fill up and then overflow the largest size |
| 1439 | S-record (255 bytes in this case). This amounts to |
| 1440 | 256/8 + 1 packets. |
| 1441 | */ |
| 1442 | |
| 1443 | mips_make_srec (srec, '7', 0, NULL, 0); |
| 1444 | |
| 1445 | for (i = 1; i <= 33; i++) |
| 1446 | { |
| 1447 | SERIAL_WRITE (mips_desc, srec, 8); |
| 1448 | |
| 1449 | if (SERIAL_READCHAR (mips_desc, 0) >= 0) |
| 1450 | break; /* Break immediatly if we get something from |
| 1451 | the board. */ |
| 1452 | } |
| 1453 | } |
| 1454 | } |
| 1455 | break; |
| 1456 | case 4: |
| 1457 | mips_error ("Failed to initialize."); |
| 1458 | } |
| 1459 | |
| 1460 | if (mips_expect (mips_monitor_prompt)) |
| 1461 | break; |
| 1462 | } |
| 1463 | |
| 1464 | if (mips_monitor != MON_IDT) |
| 1465 | { |
| 1466 | /* Sometimes PMON ignores the first few characters in the first |
| 1467 | command sent after a load. Sending a blank command gets |
| 1468 | around that. */ |
| 1469 | mips_send_command ("\r", -1); |
| 1470 | |
| 1471 | /* Ensure the correct target state: */ |
| 1472 | if (mips_monitor != MON_LSI) |
| 1473 | mips_send_command ("set regsize 64\r", -1); |
| 1474 | mips_send_command ("set hostport tty0\r", -1); |
| 1475 | mips_send_command ("set brkcmd \"\"\r", -1); |
| 1476 | /* Delete all the current breakpoints: */ |
| 1477 | mips_send_command ("db *\r", -1); |
| 1478 | /* NOTE: PMON does not have breakpoint support through the |
| 1479 | "debug" mode, only at the monitor command-line. */ |
| 1480 | } |
| 1481 | |
| 1482 | mips_enter_debug (); |
| 1483 | |
| 1484 | /* Clear all breakpoints: */ |
| 1485 | if ((mips_monitor == MON_IDT |
| 1486 | && clear_breakpoint (-1, 0, BREAK_UNUSED) == 0) |
| 1487 | || mips_monitor == MON_LSI) |
| 1488 | monitor_supports_breakpoints = 1; |
| 1489 | else |
| 1490 | monitor_supports_breakpoints = 0; |
| 1491 | |
| 1492 | do_cleanups (old_cleanups); |
| 1493 | |
| 1494 | /* If this doesn't call error, we have connected; we don't care if |
| 1495 | the request itself succeeds or fails. */ |
| 1496 | |
| 1497 | mips_request ('r', 0, 0, &err, mips_receive_wait, NULL); |
| 1498 | set_current_frame (create_new_frame (read_fp (), read_pc ())); |
| 1499 | select_frame (get_current_frame (), 0); |
| 1500 | } |
| 1501 | |
| 1502 | /* Open a connection to the remote board. */ |
| 1503 | static void |
| 1504 | common_open (struct target_ops *ops, char *name, int from_tty, |
| 1505 | enum mips_monitor_type new_monitor, |
| 1506 | const char *new_monitor_prompt) |
| 1507 | { |
| 1508 | char *ptype; |
| 1509 | char *serial_port_name; |
| 1510 | char *remote_name = 0; |
| 1511 | char *local_name = 0; |
| 1512 | char **argv; |
| 1513 | |
| 1514 | if (name == 0) |
| 1515 | error ( |
| 1516 | "To open a MIPS remote debugging connection, you need to specify what serial\n\ |
| 1517 | device is attached to the target board (e.g., /dev/ttya).\n" |
| 1518 | "If you want to use TFTP to download to the board, specify the name of a\n" |
| 1519 | "temporary file to be used by GDB for downloads as the second argument.\n" |
| 1520 | "This filename must be in the form host:filename, where host is the name\n" |
| 1521 | "of the host running the TFTP server, and the file must be readable by the\n" |
| 1522 | "world. If the local name of the temporary file differs from the name as\n" |
| 1523 | "seen from the board via TFTP, specify that name as the third parameter.\n"); |
| 1524 | |
| 1525 | /* Parse the serial port name, the optional TFTP name, and the |
| 1526 | optional local TFTP name. */ |
| 1527 | if ((argv = buildargv (name)) == NULL) |
| 1528 | nomem (0); |
| 1529 | make_cleanup_freeargv (argv); |
| 1530 | |
| 1531 | serial_port_name = strsave (argv[0]); |
| 1532 | if (argv[1]) /* remote TFTP name specified? */ |
| 1533 | { |
| 1534 | remote_name = argv[1]; |
| 1535 | if (argv[2]) /* local TFTP filename specified? */ |
| 1536 | local_name = argv[2]; |
| 1537 | } |
| 1538 | |
| 1539 | target_preopen (from_tty); |
| 1540 | |
| 1541 | if (mips_is_open) |
| 1542 | unpush_target (current_ops); |
| 1543 | |
| 1544 | /* Open and initialize the serial port. */ |
| 1545 | mips_desc = SERIAL_OPEN (serial_port_name); |
| 1546 | if (mips_desc == (serial_t) NULL) |
| 1547 | perror_with_name (serial_port_name); |
| 1548 | |
| 1549 | if (baud_rate != -1) |
| 1550 | { |
| 1551 | if (SERIAL_SETBAUDRATE (mips_desc, baud_rate)) |
| 1552 | { |
| 1553 | SERIAL_CLOSE (mips_desc); |
| 1554 | perror_with_name (serial_port_name); |
| 1555 | } |
| 1556 | } |
| 1557 | |
| 1558 | SERIAL_RAW (mips_desc); |
| 1559 | |
| 1560 | /* Open and initialize the optional download port. If it is in the form |
| 1561 | hostname#portnumber, it's a UDP socket. If it is in the form |
| 1562 | hostname:filename, assume it's the TFTP filename that must be |
| 1563 | passed to the DDB board to tell it where to get the load file. */ |
| 1564 | if (remote_name) |
| 1565 | { |
| 1566 | if (strchr (remote_name, '#')) |
| 1567 | { |
| 1568 | udp_desc = SERIAL_OPEN (remote_name); |
| 1569 | if (!udp_desc) |
| 1570 | perror_with_name ("Unable to open UDP port"); |
| 1571 | udp_in_use = 1; |
| 1572 | } |
| 1573 | else |
| 1574 | { |
| 1575 | /* Save the remote and local names of the TFTP temp file. If |
| 1576 | the user didn't specify a local name, assume it's the same |
| 1577 | as the part of the remote name after the "host:". */ |
| 1578 | if (tftp_name) |
| 1579 | xfree (tftp_name); |
| 1580 | if (tftp_localname) |
| 1581 | xfree (tftp_localname); |
| 1582 | if (local_name == NULL) |
| 1583 | if ((local_name = strchr (remote_name, ':')) != NULL) |
| 1584 | local_name++; /* skip over the colon */ |
| 1585 | if (local_name == NULL) |
| 1586 | local_name = remote_name; /* local name same as remote name */ |
| 1587 | tftp_name = strsave (remote_name); |
| 1588 | tftp_localname = strsave (local_name); |
| 1589 | tftp_in_use = 1; |
| 1590 | } |
| 1591 | } |
| 1592 | |
| 1593 | current_ops = ops; |
| 1594 | mips_is_open = 1; |
| 1595 | |
| 1596 | /* Reset the expected monitor prompt if it's never been set before. */ |
| 1597 | if (mips_monitor_prompt == NULL) |
| 1598 | mips_monitor_prompt = strsave (new_monitor_prompt); |
| 1599 | mips_monitor = new_monitor; |
| 1600 | |
| 1601 | mips_initialize (); |
| 1602 | |
| 1603 | if (from_tty) |
| 1604 | printf_unfiltered ("Remote MIPS debugging using %s\n", serial_port_name); |
| 1605 | |
| 1606 | /* Switch to using remote target now. */ |
| 1607 | push_target (ops); |
| 1608 | |
| 1609 | /* FIXME: Should we call start_remote here? */ |
| 1610 | |
| 1611 | /* Try to figure out the processor model if possible. */ |
| 1612 | ptype = mips_read_processor_type (); |
| 1613 | if (ptype) |
| 1614 | mips_set_processor_type_command (strsave (ptype), 0); |
| 1615 | |
| 1616 | /* This is really the job of start_remote however, that makes an assumption |
| 1617 | that the target is about to print out a status message of some sort. That |
| 1618 | doesn't happen here (in fact, it may not be possible to get the monitor to |
| 1619 | send the appropriate packet). */ |
| 1620 | |
| 1621 | flush_cached_frames (); |
| 1622 | registers_changed (); |
| 1623 | stop_pc = read_pc (); |
| 1624 | set_current_frame (create_new_frame (read_fp (), stop_pc)); |
| 1625 | select_frame (get_current_frame (), 0); |
| 1626 | print_stack_frame (selected_frame, -1, 1); |
| 1627 | xfree (serial_port_name); |
| 1628 | } |
| 1629 | |
| 1630 | static void |
| 1631 | mips_open (char *name, int from_tty) |
| 1632 | { |
| 1633 | const char *monitor_prompt = NULL; |
| 1634 | if (TARGET_ARCHITECTURE != NULL |
| 1635 | && TARGET_ARCHITECTURE->arch == bfd_arch_mips) |
| 1636 | { |
| 1637 | switch (TARGET_ARCHITECTURE->mach) |
| 1638 | { |
| 1639 | case bfd_mach_mips4100: |
| 1640 | case bfd_mach_mips4300: |
| 1641 | case bfd_mach_mips4600: |
| 1642 | case bfd_mach_mips4650: |
| 1643 | case bfd_mach_mips5000: |
| 1644 | monitor_prompt = "<RISQ> "; |
| 1645 | break; |
| 1646 | } |
| 1647 | } |
| 1648 | if (monitor_prompt == NULL) |
| 1649 | monitor_prompt = "<IDT>"; |
| 1650 | common_open (&mips_ops, name, from_tty, MON_IDT, monitor_prompt); |
| 1651 | } |
| 1652 | |
| 1653 | static void |
| 1654 | pmon_open (char *name, int from_tty) |
| 1655 | { |
| 1656 | common_open (&pmon_ops, name, from_tty, MON_PMON, "PMON> "); |
| 1657 | } |
| 1658 | |
| 1659 | static void |
| 1660 | ddb_open (char *name, int from_tty) |
| 1661 | { |
| 1662 | common_open (&ddb_ops, name, from_tty, MON_DDB, "NEC010>"); |
| 1663 | } |
| 1664 | |
| 1665 | static void |
| 1666 | lsi_open (char *name, int from_tty) |
| 1667 | { |
| 1668 | int i; |
| 1669 | |
| 1670 | /* Clear the LSI breakpoint table. */ |
| 1671 | for (i = 0; i < MAX_LSI_BREAKPOINTS; i++) |
| 1672 | lsi_breakpoints[i].type = BREAK_UNUSED; |
| 1673 | |
| 1674 | common_open (&lsi_ops, name, from_tty, MON_LSI, "PMON> "); |
| 1675 | } |
| 1676 | |
| 1677 | /* Close a connection to the remote board. */ |
| 1678 | |
| 1679 | static void |
| 1680 | mips_close (int quitting) |
| 1681 | { |
| 1682 | if (mips_is_open) |
| 1683 | { |
| 1684 | /* Get the board out of remote debugging mode. */ |
| 1685 | (void) mips_exit_debug (); |
| 1686 | |
| 1687 | close_ports (); |
| 1688 | } |
| 1689 | } |
| 1690 | |
| 1691 | /* Detach from the remote board. */ |
| 1692 | |
| 1693 | static void |
| 1694 | mips_detach (char *args, int from_tty) |
| 1695 | { |
| 1696 | if (args) |
| 1697 | error ("Argument given to \"detach\" when remotely debugging."); |
| 1698 | |
| 1699 | pop_target (); |
| 1700 | |
| 1701 | mips_close (1); |
| 1702 | |
| 1703 | if (from_tty) |
| 1704 | printf_unfiltered ("Ending remote MIPS debugging.\n"); |
| 1705 | } |
| 1706 | |
| 1707 | /* Tell the target board to resume. This does not wait for a reply |
| 1708 | from the board, except in the case of single-stepping on LSI boards, |
| 1709 | where PMON does return a reply. */ |
| 1710 | |
| 1711 | static void |
| 1712 | mips_resume (int pid, int step, enum target_signal siggnal) |
| 1713 | { |
| 1714 | int err; |
| 1715 | |
| 1716 | /* LSI PMON requires returns a reply packet "0x1 s 0x0 0x57f" after |
| 1717 | a single step, so we wait for that. */ |
| 1718 | mips_request (step ? 's' : 'c', 1, siggnal, |
| 1719 | mips_monitor == MON_LSI && step ? &err : (int *) NULL, |
| 1720 | mips_receive_wait, NULL); |
| 1721 | } |
| 1722 | |
| 1723 | /* Return the signal corresponding to SIG, where SIG is the number which |
| 1724 | the MIPS protocol uses for the signal. */ |
| 1725 | enum target_signal |
| 1726 | mips_signal_from_protocol (int sig) |
| 1727 | { |
| 1728 | /* We allow a few more signals than the IDT board actually returns, on |
| 1729 | the theory that there is at least *some* hope that perhaps the numbering |
| 1730 | for these signals is widely agreed upon. */ |
| 1731 | if (sig <= 0 |
| 1732 | || sig > 31) |
| 1733 | return TARGET_SIGNAL_UNKNOWN; |
| 1734 | |
| 1735 | /* Don't want to use target_signal_from_host because we are converting |
| 1736 | from MIPS signal numbers, not host ones. Our internal numbers |
| 1737 | match the MIPS numbers for the signals the board can return, which |
| 1738 | are: SIGINT, SIGSEGV, SIGBUS, SIGILL, SIGFPE, SIGTRAP. */ |
| 1739 | return (enum target_signal) sig; |
| 1740 | } |
| 1741 | |
| 1742 | /* Wait until the remote stops, and return a wait status. */ |
| 1743 | |
| 1744 | static int |
| 1745 | mips_wait (int pid, struct target_waitstatus *status) |
| 1746 | { |
| 1747 | int rstatus; |
| 1748 | int err; |
| 1749 | char buff[DATA_MAXLEN]; |
| 1750 | int rpc, rfp, rsp; |
| 1751 | char flags[20]; |
| 1752 | int nfields; |
| 1753 | int i; |
| 1754 | |
| 1755 | interrupt_count = 0; |
| 1756 | hit_watchpoint = 0; |
| 1757 | |
| 1758 | /* If we have not sent a single step or continue command, then the |
| 1759 | board is waiting for us to do something. Return a status |
| 1760 | indicating that it is stopped. */ |
| 1761 | if (!mips_need_reply) |
| 1762 | { |
| 1763 | status->kind = TARGET_WAITKIND_STOPPED; |
| 1764 | status->value.sig = TARGET_SIGNAL_TRAP; |
| 1765 | return 0; |
| 1766 | } |
| 1767 | |
| 1768 | /* No timeout; we sit here as long as the program continues to execute. */ |
| 1769 | mips_wait_flag = 1; |
| 1770 | rstatus = mips_request ('\000', 0, 0, &err, -1, buff); |
| 1771 | mips_wait_flag = 0; |
| 1772 | if (err) |
| 1773 | mips_error ("Remote failure: %s", safe_strerror (errno)); |
| 1774 | |
| 1775 | /* On returning from a continue, the PMON monitor seems to start |
| 1776 | echoing back the messages we send prior to sending back the |
| 1777 | ACK. The code can cope with this, but to try and avoid the |
| 1778 | unnecessary serial traffic, and "spurious" characters displayed |
| 1779 | to the user, we cheat and reset the debug protocol. The problems |
| 1780 | seems to be caused by a check on the number of arguments, and the |
| 1781 | command length, within the monitor causing it to echo the command |
| 1782 | as a bad packet. */ |
| 1783 | if (mips_monitor == MON_PMON) |
| 1784 | { |
| 1785 | mips_exit_debug (); |
| 1786 | mips_enter_debug (); |
| 1787 | } |
| 1788 | |
| 1789 | /* See if we got back extended status. If so, pick out the pc, fp, sp, etc... */ |
| 1790 | |
| 1791 | nfields = sscanf (buff, "0x%*x %*c 0x%*x 0x%*x 0x%x 0x%x 0x%x 0x%*x %s", |
| 1792 | &rpc, &rfp, &rsp, flags); |
| 1793 | if (nfields >= 3) |
| 1794 | { |
| 1795 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 1796 | |
| 1797 | store_unsigned_integer (buf, REGISTER_RAW_SIZE (PC_REGNUM), rpc); |
| 1798 | supply_register (PC_REGNUM, buf); |
| 1799 | |
| 1800 | store_unsigned_integer (buf, REGISTER_RAW_SIZE (PC_REGNUM), rfp); |
| 1801 | supply_register (30, buf); /* This register they are avoiding and so it is unnamed */ |
| 1802 | |
| 1803 | store_unsigned_integer (buf, REGISTER_RAW_SIZE (SP_REGNUM), rsp); |
| 1804 | supply_register (SP_REGNUM, buf); |
| 1805 | |
| 1806 | store_unsigned_integer (buf, REGISTER_RAW_SIZE (FP_REGNUM), 0); |
| 1807 | supply_register (FP_REGNUM, buf); |
| 1808 | |
| 1809 | if (nfields == 9) |
| 1810 | { |
| 1811 | int i; |
| 1812 | |
| 1813 | for (i = 0; i <= 2; i++) |
| 1814 | if (flags[i] == 'r' || flags[i] == 'w') |
| 1815 | hit_watchpoint = 1; |
| 1816 | else if (flags[i] == '\000') |
| 1817 | break; |
| 1818 | } |
| 1819 | } |
| 1820 | |
| 1821 | if (strcmp (target_shortname, "lsi") == 0) |
| 1822 | { |
| 1823 | #if 0 |
| 1824 | /* If this is an LSI PMON target, see if we just hit a hardrdware watchpoint. |
| 1825 | Right now, PMON doesn't give us enough information to determine which |
| 1826 | breakpoint we hit. So we have to look up the PC in our own table |
| 1827 | of breakpoints, and if found, assume it's just a normal instruction |
| 1828 | fetch breakpoint, not a data watchpoint. FIXME when PMON |
| 1829 | provides some way to tell us what type of breakpoint it is. */ |
| 1830 | int i; |
| 1831 | CORE_ADDR pc = read_pc (); |
| 1832 | |
| 1833 | hit_watchpoint = 1; |
| 1834 | for (i = 0; i < MAX_LSI_BREAKPOINTS; i++) |
| 1835 | { |
| 1836 | if (lsi_breakpoints[i].addr == pc |
| 1837 | && lsi_breakpoints[i].type == BREAK_FETCH) |
| 1838 | { |
| 1839 | hit_watchpoint = 0; |
| 1840 | break; |
| 1841 | } |
| 1842 | } |
| 1843 | #else |
| 1844 | /* If a data breakpoint was hit, PMON returns the following packet: |
| 1845 | 0x1 c 0x0 0x57f 0x1 |
| 1846 | The return packet from an ordinary breakpoint doesn't have the |
| 1847 | extra 0x01 field tacked onto the end. */ |
| 1848 | if (nfields == 1 && rpc == 1) |
| 1849 | hit_watchpoint = 1; |
| 1850 | #endif |
| 1851 | } |
| 1852 | |
| 1853 | /* NOTE: The following (sig) numbers are defined by PMON: |
| 1854 | SPP_SIGTRAP 5 breakpoint |
| 1855 | SPP_SIGINT 2 |
| 1856 | SPP_SIGSEGV 11 |
| 1857 | SPP_SIGBUS 10 |
| 1858 | SPP_SIGILL 4 |
| 1859 | SPP_SIGFPE 8 |
| 1860 | SPP_SIGTERM 15 */ |
| 1861 | |
| 1862 | /* Translate a MIPS waitstatus. We use constants here rather than WTERMSIG |
| 1863 | and so on, because the constants we want here are determined by the |
| 1864 | MIPS protocol and have nothing to do with what host we are running on. */ |
| 1865 | if ((rstatus & 0xff) == 0) |
| 1866 | { |
| 1867 | status->kind = TARGET_WAITKIND_EXITED; |
| 1868 | status->value.integer = (((rstatus) >> 8) & 0xff); |
| 1869 | } |
| 1870 | else if ((rstatus & 0xff) == 0x7f) |
| 1871 | { |
| 1872 | status->kind = TARGET_WAITKIND_STOPPED; |
| 1873 | status->value.sig = mips_signal_from_protocol (((rstatus) >> 8) & 0xff); |
| 1874 | |
| 1875 | /* If the stop PC is in the _exit function, assume |
| 1876 | we hit the 'break 0x3ff' instruction in _exit, so this |
| 1877 | is not a normal breakpoint. */ |
| 1878 | if (strcmp (target_shortname, "lsi") == 0) |
| 1879 | { |
| 1880 | char *func_name; |
| 1881 | CORE_ADDR func_start; |
| 1882 | CORE_ADDR pc = read_pc (); |
| 1883 | |
| 1884 | find_pc_partial_function (pc, &func_name, &func_start, NULL); |
| 1885 | if (func_name != NULL && strcmp (func_name, "_exit") == 0 |
| 1886 | && func_start == pc) |
| 1887 | status->kind = TARGET_WAITKIND_EXITED; |
| 1888 | } |
| 1889 | } |
| 1890 | else |
| 1891 | { |
| 1892 | status->kind = TARGET_WAITKIND_SIGNALLED; |
| 1893 | status->value.sig = mips_signal_from_protocol (rstatus & 0x7f); |
| 1894 | } |
| 1895 | |
| 1896 | return 0; |
| 1897 | } |
| 1898 | |
| 1899 | /* We have to map between the register numbers used by gdb and the |
| 1900 | register numbers used by the debugging protocol. This function |
| 1901 | assumes that we are using tm-mips.h. */ |
| 1902 | |
| 1903 | #define REGNO_OFFSET 96 |
| 1904 | |
| 1905 | static int |
| 1906 | mips_map_regno (int regno) |
| 1907 | { |
| 1908 | if (regno < 32) |
| 1909 | return regno; |
| 1910 | if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32) |
| 1911 | return regno - FP0_REGNUM + 32; |
| 1912 | switch (regno) |
| 1913 | { |
| 1914 | case PC_REGNUM: |
| 1915 | return REGNO_OFFSET + 0; |
| 1916 | case CAUSE_REGNUM: |
| 1917 | return REGNO_OFFSET + 1; |
| 1918 | case HI_REGNUM: |
| 1919 | return REGNO_OFFSET + 2; |
| 1920 | case LO_REGNUM: |
| 1921 | return REGNO_OFFSET + 3; |
| 1922 | case FCRCS_REGNUM: |
| 1923 | return REGNO_OFFSET + 4; |
| 1924 | case FCRIR_REGNUM: |
| 1925 | return REGNO_OFFSET + 5; |
| 1926 | default: |
| 1927 | /* FIXME: Is there a way to get the status register? */ |
| 1928 | return 0; |
| 1929 | } |
| 1930 | } |
| 1931 | |
| 1932 | /* Fetch the remote registers. */ |
| 1933 | |
| 1934 | static void |
| 1935 | mips_fetch_registers (int regno) |
| 1936 | { |
| 1937 | unsigned LONGEST val; |
| 1938 | int err; |
| 1939 | |
| 1940 | if (regno == -1) |
| 1941 | { |
| 1942 | for (regno = 0; regno < NUM_REGS; regno++) |
| 1943 | mips_fetch_registers (regno); |
| 1944 | return; |
| 1945 | } |
| 1946 | |
| 1947 | if (regno == FP_REGNUM || regno == ZERO_REGNUM) |
| 1948 | /* FP_REGNUM on the mips is a hack which is just supposed to read |
| 1949 | zero (see also mips-nat.c). */ |
| 1950 | val = 0; |
| 1951 | else |
| 1952 | { |
| 1953 | /* If PMON doesn't support this register, don't waste serial |
| 1954 | bandwidth trying to read it. */ |
| 1955 | int pmon_reg = mips_map_regno (regno); |
| 1956 | if (regno != 0 && pmon_reg == 0) |
| 1957 | val = 0; |
| 1958 | else |
| 1959 | { |
| 1960 | /* Unfortunately the PMON version in the Vr4300 board has been |
| 1961 | compiled without the 64bit register access commands. This |
| 1962 | means we cannot get hold of the full register width. */ |
| 1963 | if (mips_monitor == MON_DDB) |
| 1964 | val = (unsigned) mips_request ('t', pmon_reg, 0, |
| 1965 | &err, mips_receive_wait, NULL); |
| 1966 | else |
| 1967 | val = mips_request ('r', pmon_reg, 0, |
| 1968 | &err, mips_receive_wait, NULL); |
| 1969 | if (err) |
| 1970 | mips_error ("Can't read register %d: %s", regno, |
| 1971 | safe_strerror (errno)); |
| 1972 | } |
| 1973 | } |
| 1974 | |
| 1975 | { |
| 1976 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 1977 | |
| 1978 | /* We got the number the register holds, but gdb expects to see a |
| 1979 | value in the target byte ordering. */ |
| 1980 | store_unsigned_integer (buf, REGISTER_RAW_SIZE (regno), val); |
| 1981 | supply_register (regno, buf); |
| 1982 | } |
| 1983 | } |
| 1984 | |
| 1985 | /* Prepare to store registers. The MIPS protocol can store individual |
| 1986 | registers, so this function doesn't have to do anything. */ |
| 1987 | |
| 1988 | static void |
| 1989 | mips_prepare_to_store (void) |
| 1990 | { |
| 1991 | } |
| 1992 | |
| 1993 | /* Store remote register(s). */ |
| 1994 | |
| 1995 | static void |
| 1996 | mips_store_registers (int regno) |
| 1997 | { |
| 1998 | int err; |
| 1999 | |
| 2000 | if (regno == -1) |
| 2001 | { |
| 2002 | for (regno = 0; regno < NUM_REGS; regno++) |
| 2003 | mips_store_registers (regno); |
| 2004 | return; |
| 2005 | } |
| 2006 | |
| 2007 | mips_request ('R', mips_map_regno (regno), |
| 2008 | read_register (regno), |
| 2009 | &err, mips_receive_wait, NULL); |
| 2010 | if (err) |
| 2011 | mips_error ("Can't write register %d: %s", regno, safe_strerror (errno)); |
| 2012 | } |
| 2013 | |
| 2014 | /* Fetch a word from the target board. */ |
| 2015 | |
| 2016 | static unsigned int |
| 2017 | mips_fetch_word (CORE_ADDR addr) |
| 2018 | { |
| 2019 | unsigned int val; |
| 2020 | int err; |
| 2021 | |
| 2022 | val = mips_request ('d', addr, 0, &err, mips_receive_wait, NULL); |
| 2023 | if (err) |
| 2024 | { |
| 2025 | /* Data space failed; try instruction space. */ |
| 2026 | val = mips_request ('i', addr, 0, &err, |
| 2027 | mips_receive_wait, NULL); |
| 2028 | if (err) |
| 2029 | mips_error ("Can't read address 0x%s: %s", |
| 2030 | paddr_nz (addr), safe_strerror (errno)); |
| 2031 | } |
| 2032 | return val; |
| 2033 | } |
| 2034 | |
| 2035 | /* Store a word to the target board. Returns errno code or zero for |
| 2036 | success. If OLD_CONTENTS is non-NULL, put the old contents of that |
| 2037 | memory location there. */ |
| 2038 | |
| 2039 | /* FIXME! make sure only 32-bit quantities get stored! */ |
| 2040 | static int |
| 2041 | mips_store_word (CORE_ADDR addr, unsigned int val, char *old_contents) |
| 2042 | { |
| 2043 | int err; |
| 2044 | unsigned int oldcontents; |
| 2045 | |
| 2046 | oldcontents = mips_request ('D', addr, val, &err, |
| 2047 | mips_receive_wait, NULL); |
| 2048 | if (err) |
| 2049 | { |
| 2050 | /* Data space failed; try instruction space. */ |
| 2051 | oldcontents = mips_request ('I', addr, val, &err, |
| 2052 | mips_receive_wait, NULL); |
| 2053 | if (err) |
| 2054 | return errno; |
| 2055 | } |
| 2056 | if (old_contents != NULL) |
| 2057 | store_unsigned_integer (old_contents, 4, oldcontents); |
| 2058 | return 0; |
| 2059 | } |
| 2060 | |
| 2061 | /* Read or write LEN bytes from inferior memory at MEMADDR, |
| 2062 | transferring to or from debugger address MYADDR. Write to inferior |
| 2063 | if SHOULD_WRITE is nonzero. Returns length of data written or |
| 2064 | read; 0 for error. Note that protocol gives us the correct value |
| 2065 | for a longword, since it transfers values in ASCII. We want the |
| 2066 | byte values, so we have to swap the longword values. */ |
| 2067 | |
| 2068 | static int mask_address_p = 1; |
| 2069 | |
| 2070 | static int |
| 2071 | mips_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, |
| 2072 | struct target_ops *ignore) |
| 2073 | { |
| 2074 | int i; |
| 2075 | CORE_ADDR addr; |
| 2076 | int count; |
| 2077 | char *buffer; |
| 2078 | int status; |
| 2079 | |
| 2080 | /* PMON targets do not cope well with 64 bit addresses. Mask the |
| 2081 | value down to 32 bits. */ |
| 2082 | if (mask_address_p) |
| 2083 | memaddr &= (CORE_ADDR) 0xffffffff; |
| 2084 | |
| 2085 | /* Round starting address down to longword boundary. */ |
| 2086 | addr = memaddr & ~3; |
| 2087 | /* Round ending address up; get number of longwords that makes. */ |
| 2088 | count = (((memaddr + len) - addr) + 3) / 4; |
| 2089 | /* Allocate buffer of that many longwords. */ |
| 2090 | buffer = alloca (count * 4); |
| 2091 | |
| 2092 | if (write) |
| 2093 | { |
| 2094 | /* Fill start and end extra bytes of buffer with existing data. */ |
| 2095 | if (addr != memaddr || len < 4) |
| 2096 | { |
| 2097 | /* Need part of initial word -- fetch it. */ |
| 2098 | store_unsigned_integer (&buffer[0], 4, mips_fetch_word (addr)); |
| 2099 | } |
| 2100 | |
| 2101 | if (count > 1) |
| 2102 | { |
| 2103 | /* Need part of last word -- fetch it. FIXME: we do this even |
| 2104 | if we don't need it. */ |
| 2105 | store_unsigned_integer (&buffer[(count - 1) * 4], 4, |
| 2106 | mips_fetch_word (addr + (count - 1) * 4)); |
| 2107 | } |
| 2108 | |
| 2109 | /* Copy data to be written over corresponding part of buffer */ |
| 2110 | |
| 2111 | memcpy ((char *) buffer + (memaddr & 3), myaddr, len); |
| 2112 | |
| 2113 | /* Write the entire buffer. */ |
| 2114 | |
| 2115 | for (i = 0; i < count; i++, addr += 4) |
| 2116 | { |
| 2117 | status = mips_store_word (addr, |
| 2118 | extract_unsigned_integer (&buffer[i * 4], 4), |
| 2119 | NULL); |
| 2120 | /* Report each kilobyte (we download 32-bit words at a time) */ |
| 2121 | if (i % 256 == 255) |
| 2122 | { |
| 2123 | printf_unfiltered ("*"); |
| 2124 | gdb_flush (gdb_stdout); |
| 2125 | } |
| 2126 | if (status) |
| 2127 | { |
| 2128 | errno = status; |
| 2129 | return 0; |
| 2130 | } |
| 2131 | /* FIXME: Do we want a QUIT here? */ |
| 2132 | } |
| 2133 | if (count >= 256) |
| 2134 | printf_unfiltered ("\n"); |
| 2135 | } |
| 2136 | else |
| 2137 | { |
| 2138 | /* Read all the longwords */ |
| 2139 | for (i = 0; i < count; i++, addr += 4) |
| 2140 | { |
| 2141 | store_unsigned_integer (&buffer[i * 4], 4, mips_fetch_word (addr)); |
| 2142 | QUIT; |
| 2143 | } |
| 2144 | |
| 2145 | /* Copy appropriate bytes out of the buffer. */ |
| 2146 | memcpy (myaddr, buffer + (memaddr & 3), len); |
| 2147 | } |
| 2148 | return len; |
| 2149 | } |
| 2150 | |
| 2151 | /* Print info on this target. */ |
| 2152 | |
| 2153 | static void |
| 2154 | mips_files_info (struct target_ops *ignore) |
| 2155 | { |
| 2156 | printf_unfiltered ("Debugging a MIPS board over a serial line.\n"); |
| 2157 | } |
| 2158 | |
| 2159 | /* Kill the process running on the board. This will actually only |
| 2160 | work if we are doing remote debugging over the console input. I |
| 2161 | think that if IDT/sim had the remote debug interrupt enabled on the |
| 2162 | right port, we could interrupt the process with a break signal. */ |
| 2163 | |
| 2164 | static void |
| 2165 | mips_kill (void) |
| 2166 | { |
| 2167 | if (!mips_wait_flag) |
| 2168 | return; |
| 2169 | |
| 2170 | interrupt_count++; |
| 2171 | |
| 2172 | if (interrupt_count >= 2) |
| 2173 | { |
| 2174 | interrupt_count = 0; |
| 2175 | |
| 2176 | target_terminal_ours (); |
| 2177 | |
| 2178 | if (query ("Interrupted while waiting for the program.\n\ |
| 2179 | Give up (and stop debugging it)? ")) |
| 2180 | { |
| 2181 | /* Clean up in such a way that mips_close won't try to talk to the |
| 2182 | board (it almost surely won't work since we weren't able to talk to |
| 2183 | it). */ |
| 2184 | mips_wait_flag = 0; |
| 2185 | close_ports (); |
| 2186 | |
| 2187 | printf_unfiltered ("Ending remote MIPS debugging.\n"); |
| 2188 | target_mourn_inferior (); |
| 2189 | |
| 2190 | return_to_top_level (RETURN_QUIT); |
| 2191 | } |
| 2192 | |
| 2193 | target_terminal_inferior (); |
| 2194 | } |
| 2195 | |
| 2196 | if (remote_debug > 0) |
| 2197 | printf_unfiltered ("Sending break\n"); |
| 2198 | |
| 2199 | SERIAL_SEND_BREAK (mips_desc); |
| 2200 | |
| 2201 | #if 0 |
| 2202 | if (mips_is_open) |
| 2203 | { |
| 2204 | char cc; |
| 2205 | |
| 2206 | /* Send a ^C. */ |
| 2207 | cc = '\003'; |
| 2208 | SERIAL_WRITE (mips_desc, &cc, 1); |
| 2209 | sleep (1); |
| 2210 | target_mourn_inferior (); |
| 2211 | } |
| 2212 | #endif |
| 2213 | } |
| 2214 | |
| 2215 | /* Start running on the target board. */ |
| 2216 | |
| 2217 | static void |
| 2218 | mips_create_inferior (char *execfile, char *args, char **env) |
| 2219 | { |
| 2220 | CORE_ADDR entry_pt; |
| 2221 | |
| 2222 | if (args && *args) |
| 2223 | { |
| 2224 | warning ("\ |
| 2225 | Can't pass arguments to remote MIPS board; arguments ignored."); |
| 2226 | /* And don't try to use them on the next "run" command. */ |
| 2227 | execute_command ("set args", 0); |
| 2228 | } |
| 2229 | |
| 2230 | if (execfile == 0 || exec_bfd == 0) |
| 2231 | error ("No executable file specified"); |
| 2232 | |
| 2233 | entry_pt = (CORE_ADDR) bfd_get_start_address (exec_bfd); |
| 2234 | |
| 2235 | init_wait_for_inferior (); |
| 2236 | |
| 2237 | /* FIXME: Should we set inferior_pid here? */ |
| 2238 | |
| 2239 | proceed (entry_pt, TARGET_SIGNAL_DEFAULT, 0); |
| 2240 | } |
| 2241 | |
| 2242 | /* Clean up after a process. Actually nothing to do. */ |
| 2243 | |
| 2244 | static void |
| 2245 | mips_mourn_inferior (void) |
| 2246 | { |
| 2247 | if (current_ops != NULL) |
| 2248 | unpush_target (current_ops); |
| 2249 | generic_mourn_inferior (); |
| 2250 | } |
| 2251 | \f |
| 2252 | /* We can write a breakpoint and read the shadow contents in one |
| 2253 | operation. */ |
| 2254 | |
| 2255 | /* Insert a breakpoint. On targets that don't have built-in breakpoint |
| 2256 | support, we read the contents of the target location and stash it, |
| 2257 | then overwrite it with a breakpoint instruction. ADDR is the target |
| 2258 | location in the target machine. CONTENTS_CACHE is a pointer to |
| 2259 | memory allocated for saving the target contents. It is guaranteed |
| 2260 | by the caller to be long enough to save sizeof BREAKPOINT bytes (this |
| 2261 | is accomplished via BREAKPOINT_MAX). */ |
| 2262 | |
| 2263 | static int |
| 2264 | mips_insert_breakpoint (CORE_ADDR addr, char *contents_cache) |
| 2265 | { |
| 2266 | if (monitor_supports_breakpoints) |
| 2267 | return set_breakpoint (addr, MIPS_INSTLEN, BREAK_FETCH); |
| 2268 | else |
| 2269 | return memory_insert_breakpoint (addr, contents_cache); |
| 2270 | } |
| 2271 | |
| 2272 | static int |
| 2273 | mips_remove_breakpoint (CORE_ADDR addr, char *contents_cache) |
| 2274 | { |
| 2275 | if (monitor_supports_breakpoints) |
| 2276 | return clear_breakpoint (addr, MIPS_INSTLEN, BREAK_FETCH); |
| 2277 | else |
| 2278 | return memory_remove_breakpoint (addr, contents_cache); |
| 2279 | } |
| 2280 | |
| 2281 | #if 0 /* currently not used */ |
| 2282 | /* PMON does not currently provide support for the debug mode 'b' |
| 2283 | commands to manipulate breakpoints. However, if we wanted to use |
| 2284 | the monitor breakpoints (rather than the GDB BREAK_INSN version) |
| 2285 | then this code performs the work needed to leave debug mode, |
| 2286 | set/clear the breakpoint, and then return to debug mode. */ |
| 2287 | |
| 2288 | #define PMON_MAX_BP (33) /* 32 SW, 1 HW */ |
| 2289 | static CORE_ADDR mips_pmon_bp_info[PMON_MAX_BP]; |
| 2290 | /* NOTE: The code relies on this vector being zero-initialised by the system */ |
| 2291 | |
| 2292 | static int |
| 2293 | pmon_insert_breakpoint (CORE_ADDR addr, char *contents_cache) |
| 2294 | { |
| 2295 | int status; |
| 2296 | |
| 2297 | if (monitor_supports_breakpoints) |
| 2298 | { |
| 2299 | char tbuff[12]; /* space for breakpoint command */ |
| 2300 | int bpnum; |
| 2301 | CORE_ADDR bpaddr; |
| 2302 | |
| 2303 | /* PMON does not support debug level breakpoint set/remove: */ |
| 2304 | if (mips_exit_debug ()) |
| 2305 | mips_error ("Failed to exit debug mode"); |
| 2306 | |
| 2307 | sprintf (tbuff, "b %08x\r", addr); |
| 2308 | mips_send_command (tbuff, 0); |
| 2309 | |
| 2310 | mips_expect ("Bpt "); |
| 2311 | |
| 2312 | if (!mips_getstring (tbuff, remote_timeout)) |
| 2313 | return 1; |
| 2314 | tbuff[2] = '\0'; /* terminate the string */ |
| 2315 | if (sscanf (tbuff, "%d", &bpnum) != 1) |
| 2316 | { |
| 2317 | fprintf_unfiltered (gdb_stderr, |
| 2318 | "Invalid decimal breakpoint number from target: %s\n", tbuff); |
| 2319 | return 1; |
| 2320 | } |
| 2321 | |
| 2322 | mips_expect (" = "); |
| 2323 | |
| 2324 | /* Lead in the hex number we are expecting: */ |
| 2325 | tbuff[0] = '0'; |
| 2326 | tbuff[1] = 'x'; |
| 2327 | |
| 2328 | /* FIXME!! only 8 bytes! need to expand for Bfd64; |
| 2329 | which targets return 64-bit addresses? PMON returns only 32! */ |
| 2330 | if (!mips_getstring (&tbuff[2], 8)) |
| 2331 | return 1; |
| 2332 | tbuff[10] = '\0'; /* terminate the string */ |
| 2333 | |
| 2334 | if (sscanf (tbuff, "0x%08x", &bpaddr) != 1) |
| 2335 | { |
| 2336 | fprintf_unfiltered (gdb_stderr, |
| 2337 | "Invalid hex address from target: %s\n", tbuff); |
| 2338 | return 1; |
| 2339 | } |
| 2340 | |
| 2341 | if (bpnum >= PMON_MAX_BP) |
| 2342 | { |
| 2343 | fprintf_unfiltered (gdb_stderr, |
| 2344 | "Error: Returned breakpoint number %d outside acceptable range (0..%d)\n", |
| 2345 | bpnum, PMON_MAX_BP - 1); |
| 2346 | return 1; |
| 2347 | } |
| 2348 | |
| 2349 | if (bpaddr != addr) |
| 2350 | fprintf_unfiltered (gdb_stderr, "Warning: Breakpoint addresses do not match: 0x%x != 0x%x\n", addr, bpaddr); |
| 2351 | |
| 2352 | mips_pmon_bp_info[bpnum] = bpaddr; |
| 2353 | |
| 2354 | mips_expect ("\r\n"); |
| 2355 | mips_expect (mips_monitor_prompt); |
| 2356 | |
| 2357 | mips_enter_debug (); |
| 2358 | |
| 2359 | return 0; |
| 2360 | } |
| 2361 | |
| 2362 | return mips_store_word (addr, BREAK_INSN, contents_cache); |
| 2363 | } |
| 2364 | |
| 2365 | static int |
| 2366 | pmon_remove_breakpoint (CORE_ADDR addr, char *contents_cache) |
| 2367 | { |
| 2368 | if (monitor_supports_breakpoints) |
| 2369 | { |
| 2370 | int bpnum; |
| 2371 | char tbuff[7]; /* enough for delete breakpoint command */ |
| 2372 | |
| 2373 | for (bpnum = 0; bpnum < PMON_MAX_BP; bpnum++) |
| 2374 | if (mips_pmon_bp_info[bpnum] == addr) |
| 2375 | break; |
| 2376 | |
| 2377 | if (bpnum >= PMON_MAX_BP) |
| 2378 | { |
| 2379 | fprintf_unfiltered (gdb_stderr, |
| 2380 | "pmon_remove_breakpoint: Failed to find breakpoint at address 0x%s\n", |
| 2381 | paddr_nz (addr)); |
| 2382 | return 1; |
| 2383 | } |
| 2384 | |
| 2385 | if (mips_exit_debug ()) |
| 2386 | mips_error ("Failed to exit debug mode"); |
| 2387 | |
| 2388 | sprintf (tbuff, "db %02d\r", bpnum); |
| 2389 | |
| 2390 | mips_send_command (tbuff, -1); |
| 2391 | /* NOTE: If the breakpoint does not exist then a "Bpt <dd> not |
| 2392 | set" message will be returned. */ |
| 2393 | |
| 2394 | mips_enter_debug (); |
| 2395 | |
| 2396 | return 0; |
| 2397 | } |
| 2398 | |
| 2399 | return target_write_memory (addr, contents_cache, BREAK_INSN_SIZE); |
| 2400 | } |
| 2401 | #endif |
| 2402 | |
| 2403 | |
| 2404 | /* Tell whether this target can support a hardware breakpoint. CNT |
| 2405 | is the number of hardware breakpoints already installed. This |
| 2406 | implements the TARGET_CAN_USE_HARDWARE_WATCHPOINT macro. */ |
| 2407 | |
| 2408 | int |
| 2409 | remote_mips_can_use_hardware_watchpoint (int cnt) |
| 2410 | { |
| 2411 | return cnt < MAX_LSI_BREAKPOINTS && strcmp (target_shortname, "lsi") == 0; |
| 2412 | } |
| 2413 | |
| 2414 | |
| 2415 | /* Compute a don't care mask for the region bounding ADDR and ADDR + LEN - 1. |
| 2416 | This is used for memory ref breakpoints. */ |
| 2417 | |
| 2418 | static unsigned long |
| 2419 | calculate_mask (CORE_ADDR addr, int len) |
| 2420 | { |
| 2421 | unsigned long mask; |
| 2422 | int i; |
| 2423 | |
| 2424 | mask = addr ^ (addr + len - 1); |
| 2425 | |
| 2426 | for (i = 32; i >= 0; i--) |
| 2427 | if (mask == 0) |
| 2428 | break; |
| 2429 | else |
| 2430 | mask >>= 1; |
| 2431 | |
| 2432 | mask = (unsigned long) 0xffffffff >> i; |
| 2433 | |
| 2434 | return mask; |
| 2435 | } |
| 2436 | |
| 2437 | |
| 2438 | /* Insert a hardware breakpoint. This works only on LSI targets, which |
| 2439 | implement ordinary breakpoints using hardware facilities. */ |
| 2440 | |
| 2441 | int |
| 2442 | remote_mips_insert_hw_breakpoint (CORE_ADDR addr, char *contents_cache) |
| 2443 | { |
| 2444 | if (strcmp (target_shortname, "lsi") == 0) |
| 2445 | return mips_insert_breakpoint (addr, contents_cache); |
| 2446 | else |
| 2447 | return -1; |
| 2448 | } |
| 2449 | |
| 2450 | |
| 2451 | /* Remove a hardware breakpoint. This works only on LSI targets, which |
| 2452 | implement ordinary breakpoints using hardware facilities. */ |
| 2453 | |
| 2454 | int |
| 2455 | remote_mips_remove_hw_breakpoint (CORE_ADDR addr, char *contents_cache) |
| 2456 | { |
| 2457 | if (strcmp (target_shortname, "lsi") == 0) |
| 2458 | return mips_remove_breakpoint (addr, contents_cache); |
| 2459 | else |
| 2460 | return -1; |
| 2461 | } |
| 2462 | |
| 2463 | /* Set a data watchpoint. ADDR and LEN should be obvious. TYPE is 0 |
| 2464 | for a write watchpoint, 1 for a read watchpoint, or 2 for a read/write |
| 2465 | watchpoint. */ |
| 2466 | |
| 2467 | int |
| 2468 | remote_mips_set_watchpoint (CORE_ADDR addr, int len, int type) |
| 2469 | { |
| 2470 | if (set_breakpoint (addr, len, type)) |
| 2471 | return -1; |
| 2472 | |
| 2473 | return 0; |
| 2474 | } |
| 2475 | |
| 2476 | int |
| 2477 | remote_mips_remove_watchpoint (CORE_ADDR addr, int len, int type) |
| 2478 | { |
| 2479 | if (clear_breakpoint (addr, len, type)) |
| 2480 | return -1; |
| 2481 | |
| 2482 | return 0; |
| 2483 | } |
| 2484 | |
| 2485 | int |
| 2486 | remote_mips_stopped_by_watchpoint (void) |
| 2487 | { |
| 2488 | return hit_watchpoint; |
| 2489 | } |
| 2490 | |
| 2491 | |
| 2492 | /* Insert a breakpoint. */ |
| 2493 | |
| 2494 | static int |
| 2495 | set_breakpoint (CORE_ADDR addr, int len, enum break_type type) |
| 2496 | { |
| 2497 | return common_breakpoint (1, addr, len, type); |
| 2498 | } |
| 2499 | |
| 2500 | |
| 2501 | /* Clear a breakpoint. */ |
| 2502 | |
| 2503 | static int |
| 2504 | clear_breakpoint (CORE_ADDR addr, int len, enum break_type type) |
| 2505 | { |
| 2506 | return common_breakpoint (0, addr, len, type); |
| 2507 | } |
| 2508 | |
| 2509 | |
| 2510 | /* Check the error code from the return packet for an LSI breakpoint |
| 2511 | command. If there's no error, just return 0. If it's a warning, |
| 2512 | print the warning text and return 0. If it's an error, print |
| 2513 | the error text and return 1. <ADDR> is the address of the breakpoint |
| 2514 | that was being set. <RERRFLG> is the error code returned by PMON. |
| 2515 | This is a helper function for common_breakpoint. */ |
| 2516 | |
| 2517 | static int |
| 2518 | check_lsi_error (CORE_ADDR addr, int rerrflg) |
| 2519 | { |
| 2520 | struct lsi_error *err; |
| 2521 | char *saddr = paddr_nz (addr); /* printable address string */ |
| 2522 | |
| 2523 | if (rerrflg == 0) /* no error */ |
| 2524 | return 0; |
| 2525 | |
| 2526 | /* Warnings can be ORed together, so check them all. */ |
| 2527 | if (rerrflg & W_WARN) |
| 2528 | { |
| 2529 | if (monitor_warnings) |
| 2530 | { |
| 2531 | int found = 0; |
| 2532 | for (err = lsi_warning_table; err->code != 0; err++) |
| 2533 | { |
| 2534 | if ((err->code & rerrflg) == err->code) |
| 2535 | { |
| 2536 | found = 1; |
| 2537 | fprintf_unfiltered (gdb_stderr, |
| 2538 | "common_breakpoint (0x%s): Warning: %s\n", |
| 2539 | saddr, |
| 2540 | err->string); |
| 2541 | } |
| 2542 | } |
| 2543 | if (!found) |
| 2544 | fprintf_unfiltered (gdb_stderr, |
| 2545 | "common_breakpoint (0x%s): Unknown warning: 0x%x\n", |
| 2546 | saddr, |
| 2547 | rerrflg); |
| 2548 | } |
| 2549 | return 0; |
| 2550 | } |
| 2551 | |
| 2552 | /* Errors are unique, i.e. can't be ORed together. */ |
| 2553 | for (err = lsi_error_table; err->code != 0; err++) |
| 2554 | { |
| 2555 | if ((err->code & rerrflg) == err->code) |
| 2556 | { |
| 2557 | fprintf_unfiltered (gdb_stderr, |
| 2558 | "common_breakpoint (0x%s): Error: %s\n", |
| 2559 | saddr, |
| 2560 | err->string); |
| 2561 | return 1; |
| 2562 | } |
| 2563 | } |
| 2564 | fprintf_unfiltered (gdb_stderr, |
| 2565 | "common_breakpoint (0x%s): Unknown error: 0x%x\n", |
| 2566 | saddr, |
| 2567 | rerrflg); |
| 2568 | return 1; |
| 2569 | } |
| 2570 | |
| 2571 | |
| 2572 | /* This routine sends a breakpoint command to the remote target. |
| 2573 | |
| 2574 | <SET> is 1 if setting a breakpoint, or 0 if clearing a breakpoint. |
| 2575 | <ADDR> is the address of the breakpoint. |
| 2576 | <LEN> the length of the region to break on. |
| 2577 | <TYPE> is the type of breakpoint: |
| 2578 | 0 = write (BREAK_WRITE) |
| 2579 | 1 = read (BREAK_READ) |
| 2580 | 2 = read/write (BREAK_ACCESS) |
| 2581 | 3 = instruction fetch (BREAK_FETCH) |
| 2582 | |
| 2583 | Return 0 if successful; otherwise 1. */ |
| 2584 | |
| 2585 | static int |
| 2586 | common_breakpoint (int set, CORE_ADDR addr, int len, enum break_type type) |
| 2587 | { |
| 2588 | char buf[DATA_MAXLEN + 1]; |
| 2589 | char cmd, rcmd; |
| 2590 | int rpid, rerrflg, rresponse, rlen; |
| 2591 | int nfields; |
| 2592 | |
| 2593 | addr = ADDR_BITS_REMOVE (addr); |
| 2594 | |
| 2595 | if (mips_monitor == MON_LSI) |
| 2596 | { |
| 2597 | if (set == 0) /* clear breakpoint */ |
| 2598 | { |
| 2599 | /* The LSI PMON "clear breakpoint" has this form: |
| 2600 | <pid> 'b' <bptn> 0x0 |
| 2601 | reply: |
| 2602 | <pid> 'b' 0x0 <code> |
| 2603 | |
| 2604 | <bptn> is a breakpoint number returned by an earlier 'B' command. |
| 2605 | Possible return codes: OK, E_BPT. */ |
| 2606 | |
| 2607 | int i; |
| 2608 | |
| 2609 | /* Search for the breakpoint in the table. */ |
| 2610 | for (i = 0; i < MAX_LSI_BREAKPOINTS; i++) |
| 2611 | if (lsi_breakpoints[i].type == type |
| 2612 | && lsi_breakpoints[i].addr == addr |
| 2613 | && lsi_breakpoints[i].len == len) |
| 2614 | break; |
| 2615 | |
| 2616 | /* Clear the table entry and tell PMON to clear the breakpoint. */ |
| 2617 | if (i == MAX_LSI_BREAKPOINTS) |
| 2618 | { |
| 2619 | warning ("common_breakpoint: Attempt to clear bogus breakpoint at %s\n", |
| 2620 | paddr_nz (addr)); |
| 2621 | return 1; |
| 2622 | } |
| 2623 | |
| 2624 | lsi_breakpoints[i].type = BREAK_UNUSED; |
| 2625 | sprintf (buf, "0x0 b 0x%x 0x0", i); |
| 2626 | mips_send_packet (buf, 1); |
| 2627 | |
| 2628 | rlen = mips_receive_packet (buf, 1, mips_receive_wait); |
| 2629 | buf[rlen] = '\0'; |
| 2630 | |
| 2631 | nfields = sscanf (buf, "0x%x b 0x0 0x%x", &rpid, &rerrflg); |
| 2632 | if (nfields != 2) |
| 2633 | mips_error ("common_breakpoint: Bad response from remote board: %s", buf); |
| 2634 | |
| 2635 | return (check_lsi_error (addr, rerrflg)); |
| 2636 | } |
| 2637 | else |
| 2638 | /* set a breakpoint */ |
| 2639 | { |
| 2640 | /* The LSI PMON "set breakpoint" command has this form: |
| 2641 | <pid> 'B' <addr> 0x0 |
| 2642 | reply: |
| 2643 | <pid> 'B' <bptn> <code> |
| 2644 | |
| 2645 | The "set data breakpoint" command has this form: |
| 2646 | |
| 2647 | <pid> 'A' <addr1> <type> [<addr2> [<value>]] |
| 2648 | |
| 2649 | where: type= "0x1" = read |
| 2650 | "0x2" = write |
| 2651 | "0x3" = access (read or write) |
| 2652 | |
| 2653 | The reply returns two values: |
| 2654 | bptn - a breakpoint number, which is a small integer with |
| 2655 | possible values of zero through 255. |
| 2656 | code - an error return code, a value of zero indicates a |
| 2657 | succesful completion, other values indicate various |
| 2658 | errors and warnings. |
| 2659 | |
| 2660 | Possible return codes: OK, W_QAL, E_QAL, E_OUT, E_NON. |
| 2661 | |
| 2662 | */ |
| 2663 | |
| 2664 | if (type == BREAK_FETCH) /* instruction breakpoint */ |
| 2665 | { |
| 2666 | cmd = 'B'; |
| 2667 | sprintf (buf, "0x0 B 0x%s 0x0", paddr_nz (addr)); |
| 2668 | } |
| 2669 | else |
| 2670 | /* watchpoint */ |
| 2671 | { |
| 2672 | cmd = 'A'; |
| 2673 | sprintf (buf, "0x0 A 0x%s 0x%x 0x%s", paddr_nz (addr), |
| 2674 | type == BREAK_READ ? 1 : (type == BREAK_WRITE ? 2 : 3), |
| 2675 | paddr_nz (addr + len - 1)); |
| 2676 | } |
| 2677 | mips_send_packet (buf, 1); |
| 2678 | |
| 2679 | rlen = mips_receive_packet (buf, 1, mips_receive_wait); |
| 2680 | buf[rlen] = '\0'; |
| 2681 | |
| 2682 | nfields = sscanf (buf, "0x%x %c 0x%x 0x%x", |
| 2683 | &rpid, &rcmd, &rresponse, &rerrflg); |
| 2684 | if (nfields != 4 || rcmd != cmd || rresponse > 255) |
| 2685 | mips_error ("common_breakpoint: Bad response from remote board: %s", buf); |
| 2686 | |
| 2687 | if (rerrflg != 0) |
| 2688 | if (check_lsi_error (addr, rerrflg)) |
| 2689 | return 1; |
| 2690 | |
| 2691 | /* rresponse contains PMON's breakpoint number. Record the |
| 2692 | information for this breakpoint so we can clear it later. */ |
| 2693 | lsi_breakpoints[rresponse].type = type; |
| 2694 | lsi_breakpoints[rresponse].addr = addr; |
| 2695 | lsi_breakpoints[rresponse].len = len; |
| 2696 | |
| 2697 | return 0; |
| 2698 | } |
| 2699 | } |
| 2700 | else |
| 2701 | { |
| 2702 | /* On non-LSI targets, the breakpoint command has this form: |
| 2703 | 0x0 <CMD> <ADDR> <MASK> <FLAGS> |
| 2704 | <MASK> is a don't care mask for addresses. |
| 2705 | <FLAGS> is any combination of `r', `w', or `f' for read/write/fetch. |
| 2706 | */ |
| 2707 | unsigned long mask; |
| 2708 | |
| 2709 | mask = calculate_mask (addr, len); |
| 2710 | addr &= ~mask; |
| 2711 | |
| 2712 | if (set) /* set a breakpoint */ |
| 2713 | { |
| 2714 | char *flags; |
| 2715 | switch (type) |
| 2716 | { |
| 2717 | case BREAK_WRITE: /* write */ |
| 2718 | flags = "w"; |
| 2719 | break; |
| 2720 | case BREAK_READ: /* read */ |
| 2721 | flags = "r"; |
| 2722 | break; |
| 2723 | case BREAK_ACCESS: /* read/write */ |
| 2724 | flags = "rw"; |
| 2725 | break; |
| 2726 | case BREAK_FETCH: /* fetch */ |
| 2727 | flags = "f"; |
| 2728 | break; |
| 2729 | default: |
| 2730 | abort (); |
| 2731 | } |
| 2732 | |
| 2733 | cmd = 'B'; |
| 2734 | sprintf (buf, "0x0 B 0x%s 0x%s %s", paddr_nz (addr), |
| 2735 | paddr_nz (mask), flags); |
| 2736 | } |
| 2737 | else |
| 2738 | { |
| 2739 | cmd = 'b'; |
| 2740 | sprintf (buf, "0x0 b 0x%s", paddr_nz (addr)); |
| 2741 | } |
| 2742 | |
| 2743 | mips_send_packet (buf, 1); |
| 2744 | |
| 2745 | rlen = mips_receive_packet (buf, 1, mips_receive_wait); |
| 2746 | buf[rlen] = '\0'; |
| 2747 | |
| 2748 | nfields = sscanf (buf, "0x%x %c 0x%x 0x%x", |
| 2749 | &rpid, &rcmd, &rerrflg, &rresponse); |
| 2750 | |
| 2751 | if (nfields != 4 || rcmd != cmd) |
| 2752 | mips_error ("common_breakpoint: Bad response from remote board: %s", |
| 2753 | buf); |
| 2754 | |
| 2755 | if (rerrflg != 0) |
| 2756 | { |
| 2757 | /* Ddb returns "0x0 b 0x16 0x0\000", whereas |
| 2758 | Cogent returns "0x0 b 0xffffffff 0x16\000": */ |
| 2759 | if (mips_monitor == MON_DDB) |
| 2760 | rresponse = rerrflg; |
| 2761 | if (rresponse != 22) /* invalid argument */ |
| 2762 | fprintf_unfiltered (gdb_stderr, |
| 2763 | "common_breakpoint (0x%s): Got error: 0x%x\n", |
| 2764 | paddr_nz (addr), rresponse); |
| 2765 | return 1; |
| 2766 | } |
| 2767 | } |
| 2768 | return 0; |
| 2769 | } |
| 2770 | \f |
| 2771 | static void |
| 2772 | send_srec (char *srec, int len, CORE_ADDR addr) |
| 2773 | { |
| 2774 | while (1) |
| 2775 | { |
| 2776 | int ch; |
| 2777 | |
| 2778 | SERIAL_WRITE (mips_desc, srec, len); |
| 2779 | |
| 2780 | ch = mips_readchar (remote_timeout); |
| 2781 | |
| 2782 | switch (ch) |
| 2783 | { |
| 2784 | case SERIAL_TIMEOUT: |
| 2785 | error ("Timeout during download."); |
| 2786 | break; |
| 2787 | case 0x6: /* ACK */ |
| 2788 | return; |
| 2789 | case 0x15: /* NACK */ |
| 2790 | fprintf_unfiltered (gdb_stderr, "Download got a NACK at byte %s! Retrying.\n", paddr_u (addr)); |
| 2791 | continue; |
| 2792 | default: |
| 2793 | error ("Download got unexpected ack char: 0x%x, retrying.\n", ch); |
| 2794 | } |
| 2795 | } |
| 2796 | } |
| 2797 | |
| 2798 | /* Download a binary file by converting it to S records. */ |
| 2799 | |
| 2800 | static void |
| 2801 | mips_load_srec (char *args) |
| 2802 | { |
| 2803 | bfd *abfd; |
| 2804 | asection *s; |
| 2805 | char *buffer, srec[1024]; |
| 2806 | unsigned int i; |
| 2807 | unsigned int srec_frame = 200; |
| 2808 | int reclen; |
| 2809 | static int hashmark = 1; |
| 2810 | |
| 2811 | buffer = alloca (srec_frame * 2 + 256); |
| 2812 | |
| 2813 | abfd = bfd_openr (args, 0); |
| 2814 | if (!abfd) |
| 2815 | { |
| 2816 | printf_filtered ("Unable to open file %s\n", args); |
| 2817 | return; |
| 2818 | } |
| 2819 | |
| 2820 | if (bfd_check_format (abfd, bfd_object) == 0) |
| 2821 | { |
| 2822 | printf_filtered ("File is not an object file\n"); |
| 2823 | return; |
| 2824 | } |
| 2825 | |
| 2826 | /* This actually causes a download in the IDT binary format: */ |
| 2827 | mips_send_command (LOAD_CMD, 0); |
| 2828 | |
| 2829 | for (s = abfd->sections; s; s = s->next) |
| 2830 | { |
| 2831 | if (s->flags & SEC_LOAD) |
| 2832 | { |
| 2833 | unsigned int numbytes; |
| 2834 | |
| 2835 | /* FIXME! vma too small????? */ |
| 2836 | printf_filtered ("%s\t: 0x%4lx .. 0x%4lx ", s->name, |
| 2837 | (long) s->vma, |
| 2838 | (long) (s->vma + s->_raw_size)); |
| 2839 | gdb_flush (gdb_stdout); |
| 2840 | |
| 2841 | for (i = 0; i < s->_raw_size; i += numbytes) |
| 2842 | { |
| 2843 | numbytes = min (srec_frame, s->_raw_size - i); |
| 2844 | |
| 2845 | bfd_get_section_contents (abfd, s, buffer, i, numbytes); |
| 2846 | |
| 2847 | reclen = mips_make_srec (srec, '3', s->vma + i, buffer, numbytes); |
| 2848 | send_srec (srec, reclen, s->vma + i); |
| 2849 | |
| 2850 | if (hashmark) |
| 2851 | { |
| 2852 | putchar_unfiltered ('#'); |
| 2853 | gdb_flush (gdb_stdout); |
| 2854 | } |
| 2855 | |
| 2856 | } /* Per-packet (or S-record) loop */ |
| 2857 | |
| 2858 | putchar_unfiltered ('\n'); |
| 2859 | } /* Loadable sections */ |
| 2860 | } |
| 2861 | if (hashmark) |
| 2862 | putchar_unfiltered ('\n'); |
| 2863 | |
| 2864 | /* Write a type 7 terminator record. no data for a type 7, and there |
| 2865 | is no data, so len is 0. */ |
| 2866 | |
| 2867 | reclen = mips_make_srec (srec, '7', abfd->start_address, NULL, 0); |
| 2868 | |
| 2869 | send_srec (srec, reclen, abfd->start_address); |
| 2870 | |
| 2871 | SERIAL_FLUSH_INPUT (mips_desc); |
| 2872 | } |
| 2873 | |
| 2874 | /* |
| 2875 | * mips_make_srec -- make an srecord. This writes each line, one at a |
| 2876 | * time, each with it's own header and trailer line. |
| 2877 | * An srecord looks like this: |
| 2878 | * |
| 2879 | * byte count-+ address |
| 2880 | * start ---+ | | data +- checksum |
| 2881 | * | | | | |
| 2882 | * S01000006F6B692D746573742E73726563E4 |
| 2883 | * S315000448600000000000000000FC00005900000000E9 |
| 2884 | * S31A0004000023C1400037DE00F023604000377B009020825000348D |
| 2885 | * S30B0004485A0000000000004E |
| 2886 | * S70500040000F6 |
| 2887 | * |
| 2888 | * S<type><length><address><data><checksum> |
| 2889 | * |
| 2890 | * Where |
| 2891 | * - length |
| 2892 | * is the number of bytes following upto the checksum. Note that |
| 2893 | * this is not the number of chars following, since it takes two |
| 2894 | * chars to represent a byte. |
| 2895 | * - type |
| 2896 | * is one of: |
| 2897 | * 0) header record |
| 2898 | * 1) two byte address data record |
| 2899 | * 2) three byte address data record |
| 2900 | * 3) four byte address data record |
| 2901 | * 7) four byte address termination record |
| 2902 | * 8) three byte address termination record |
| 2903 | * 9) two byte address termination record |
| 2904 | * |
| 2905 | * - address |
| 2906 | * is the start address of the data following, or in the case of |
| 2907 | * a termination record, the start address of the image |
| 2908 | * - data |
| 2909 | * is the data. |
| 2910 | * - checksum |
| 2911 | * is the sum of all the raw byte data in the record, from the length |
| 2912 | * upwards, modulo 256 and subtracted from 255. |
| 2913 | * |
| 2914 | * This routine returns the length of the S-record. |
| 2915 | * |
| 2916 | */ |
| 2917 | |
| 2918 | static int |
| 2919 | mips_make_srec (char *buf, int type, CORE_ADDR memaddr, unsigned char *myaddr, |
| 2920 | int len) |
| 2921 | { |
| 2922 | unsigned char checksum; |
| 2923 | int i; |
| 2924 | |
| 2925 | /* Create the header for the srec. addr_size is the number of bytes in the address, |
| 2926 | and 1 is the number of bytes in the count. */ |
| 2927 | |
| 2928 | /* FIXME!! bigger buf required for 64-bit! */ |
| 2929 | buf[0] = 'S'; |
| 2930 | buf[1] = type; |
| 2931 | buf[2] = len + 4 + 1; /* len + 4 byte address + 1 byte checksum */ |
| 2932 | /* This assumes S3 style downloads (4byte addresses). There should |
| 2933 | probably be a check, or the code changed to make it more |
| 2934 | explicit. */ |
| 2935 | buf[3] = memaddr >> 24; |
| 2936 | buf[4] = memaddr >> 16; |
| 2937 | buf[5] = memaddr >> 8; |
| 2938 | buf[6] = memaddr; |
| 2939 | memcpy (&buf[7], myaddr, len); |
| 2940 | |
| 2941 | /* Note that the checksum is calculated on the raw data, not the |
| 2942 | hexified data. It includes the length, address and the data |
| 2943 | portions of the packet. */ |
| 2944 | checksum = 0; |
| 2945 | buf += 2; /* Point at length byte */ |
| 2946 | for (i = 0; i < len + 4 + 1; i++) |
| 2947 | checksum += *buf++; |
| 2948 | |
| 2949 | *buf = ~checksum; |
| 2950 | |
| 2951 | return len + 8; |
| 2952 | } |
| 2953 | |
| 2954 | /* The following manifest controls whether we enable the simple flow |
| 2955 | control support provided by the monitor. If enabled the code will |
| 2956 | wait for an affirmative ACK between transmitting packets. */ |
| 2957 | #define DOETXACK (1) |
| 2958 | |
| 2959 | /* The PMON fast-download uses an encoded packet format constructed of |
| 2960 | 3byte data packets (encoded as 4 printable ASCII characters), and |
| 2961 | escape sequences (preceded by a '/'): |
| 2962 | |
| 2963 | 'K' clear checksum |
| 2964 | 'C' compare checksum (12bit value, not included in checksum calculation) |
| 2965 | 'S' define symbol name (for addr) terminated with "," and padded to 4char boundary |
| 2966 | 'Z' zero fill multiple of 3bytes |
| 2967 | 'B' byte (12bit encoded value, of 8bit data) |
| 2968 | 'A' address (36bit encoded value) |
| 2969 | 'E' define entry as original address, and exit load |
| 2970 | |
| 2971 | The packets are processed in 4 character chunks, so the escape |
| 2972 | sequences that do not have any data (or variable length data) |
| 2973 | should be padded to a 4 character boundary. The decoder will give |
| 2974 | an error if the complete message block size is not a multiple of |
| 2975 | 4bytes (size of record). |
| 2976 | |
| 2977 | The encoding of numbers is done in 6bit fields. The 6bit value is |
| 2978 | used to index into this string to get the specific character |
| 2979 | encoding for the value: */ |
| 2980 | static char encoding[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789,."; |
| 2981 | |
| 2982 | /* Convert the number of bits required into an encoded number, 6bits |
| 2983 | at a time (range 0..63). Keep a checksum if required (passed |
| 2984 | pointer non-NULL). The function returns the number of encoded |
| 2985 | characters written into the buffer. */ |
| 2986 | static int |
| 2987 | pmon_makeb64 (unsigned long v, char *p, int n, int *chksum) |
| 2988 | { |
| 2989 | int count = (n / 6); |
| 2990 | |
| 2991 | if ((n % 12) != 0) |
| 2992 | { |
| 2993 | fprintf_unfiltered (gdb_stderr, |
| 2994 | "Fast encoding bitcount must be a multiple of 12bits: %dbit%s\n", n, (n == 1) ? "" : "s"); |
| 2995 | return (0); |
| 2996 | } |
| 2997 | if (n > 36) |
| 2998 | { |
| 2999 | fprintf_unfiltered (gdb_stderr, |
| 3000 | "Fast encoding cannot process more than 36bits at the moment: %dbits\n", n); |
| 3001 | return (0); |
| 3002 | } |
| 3003 | |
| 3004 | /* Deal with the checksum: */ |
| 3005 | if (chksum != NULL) |
| 3006 | { |
| 3007 | switch (n) |
| 3008 | { |
| 3009 | case 36: |
| 3010 | *chksum += ((v >> 24) & 0xFFF); |
| 3011 | case 24: |
| 3012 | *chksum += ((v >> 12) & 0xFFF); |
| 3013 | case 12: |
| 3014 | *chksum += ((v >> 0) & 0xFFF); |
| 3015 | } |
| 3016 | } |
| 3017 | |
| 3018 | do |
| 3019 | { |
| 3020 | n -= 6; |
| 3021 | *p++ = encoding[(v >> n) & 0x3F]; |
| 3022 | } |
| 3023 | while (n > 0); |
| 3024 | |
| 3025 | return (count); |
| 3026 | } |
| 3027 | |
| 3028 | /* Shorthand function (that could be in-lined) to output the zero-fill |
| 3029 | escape sequence into the data stream. */ |
| 3030 | static int |
| 3031 | pmon_zeroset (int recsize, char **buff, int *amount, unsigned int *chksum) |
| 3032 | { |
| 3033 | int count; |
| 3034 | |
| 3035 | sprintf (*buff, "/Z"); |
| 3036 | count = pmon_makeb64 (*amount, (*buff + 2), 12, chksum); |
| 3037 | *buff += (count + 2); |
| 3038 | *amount = 0; |
| 3039 | return (recsize + count + 2); |
| 3040 | } |
| 3041 | |
| 3042 | static int |
| 3043 | pmon_checkset (int recsize, char **buff, int *value) |
| 3044 | { |
| 3045 | int count; |
| 3046 | |
| 3047 | /* Add the checksum (without updating the value): */ |
| 3048 | sprintf (*buff, "/C"); |
| 3049 | count = pmon_makeb64 (*value, (*buff + 2), 12, NULL); |
| 3050 | *buff += (count + 2); |
| 3051 | sprintf (*buff, "\n"); |
| 3052 | *buff += 2; /* include zero terminator */ |
| 3053 | /* Forcing a checksum validation clears the sum: */ |
| 3054 | *value = 0; |
| 3055 | return (recsize + count + 3); |
| 3056 | } |
| 3057 | |
| 3058 | /* Amount of padding we leave after at the end of the output buffer, |
| 3059 | for the checksum and line termination characters: */ |
| 3060 | #define CHECKSIZE (4 + 4 + 4 + 2) |
| 3061 | /* zero-fill, checksum, transfer end and line termination space. */ |
| 3062 | |
| 3063 | /* The amount of binary data loaded from the object file in a single |
| 3064 | operation: */ |
| 3065 | #define BINCHUNK (1024) |
| 3066 | |
| 3067 | /* Maximum line of data accepted by the monitor: */ |
| 3068 | #define MAXRECSIZE (550) |
| 3069 | /* NOTE: This constant depends on the monitor being used. This value |
| 3070 | is for PMON 5.x on the Cogent Vr4300 board. */ |
| 3071 | |
| 3072 | static void |
| 3073 | pmon_make_fastrec (char **outbuf, unsigned char *inbuf, int *inptr, |
| 3074 | int inamount, int *recsize, unsigned int *csum, |
| 3075 | unsigned int *zerofill) |
| 3076 | { |
| 3077 | int count = 0; |
| 3078 | char *p = *outbuf; |
| 3079 | |
| 3080 | /* This is a simple check to ensure that our data will fit within |
| 3081 | the maximum allowable record size. Each record output is 4bytes |
| 3082 | in length. We must allow space for a pending zero fill command, |
| 3083 | the record, and a checksum record. */ |
| 3084 | while ((*recsize < (MAXRECSIZE - CHECKSIZE)) && ((inamount - *inptr) > 0)) |
| 3085 | { |
| 3086 | /* Process the binary data: */ |
| 3087 | if ((inamount - *inptr) < 3) |
| 3088 | { |
| 3089 | if (*zerofill != 0) |
| 3090 | *recsize = pmon_zeroset (*recsize, &p, zerofill, csum); |
| 3091 | sprintf (p, "/B"); |
| 3092 | count = pmon_makeb64 (inbuf[*inptr], &p[2], 12, csum); |
| 3093 | p += (2 + count); |
| 3094 | *recsize += (2 + count); |
| 3095 | (*inptr)++; |
| 3096 | } |
| 3097 | else |
| 3098 | { |
| 3099 | unsigned int value = ((inbuf[*inptr + 0] << 16) | (inbuf[*inptr + 1] << 8) | inbuf[*inptr + 2]); |
| 3100 | /* Simple check for zero data. TODO: A better check would be |
| 3101 | to check the last, and then the middle byte for being zero |
| 3102 | (if the first byte is not). We could then check for |
| 3103 | following runs of zeros, and if above a certain size it is |
| 3104 | worth the 4 or 8 character hit of the byte insertions used |
| 3105 | to pad to the start of the zeroes. NOTE: This also depends |
| 3106 | on the alignment at the end of the zero run. */ |
| 3107 | if (value == 0x00000000) |
| 3108 | { |
| 3109 | (*zerofill)++; |
| 3110 | if (*zerofill == 0xFFF) /* 12bit counter */ |
| 3111 | *recsize = pmon_zeroset (*recsize, &p, zerofill, csum); |
| 3112 | } |
| 3113 | else |
| 3114 | { |
| 3115 | if (*zerofill != 0) |
| 3116 | *recsize = pmon_zeroset (*recsize, &p, zerofill, csum); |
| 3117 | count = pmon_makeb64 (value, p, 24, csum); |
| 3118 | p += count; |
| 3119 | *recsize += count; |
| 3120 | } |
| 3121 | *inptr += 3; |
| 3122 | } |
| 3123 | } |
| 3124 | |
| 3125 | *outbuf = p; |
| 3126 | return; |
| 3127 | } |
| 3128 | |
| 3129 | static int |
| 3130 | pmon_check_ack (char *mesg) |
| 3131 | { |
| 3132 | #if defined(DOETXACK) |
| 3133 | int c; |
| 3134 | |
| 3135 | if (!tftp_in_use) |
| 3136 | { |
| 3137 | c = SERIAL_READCHAR (udp_in_use ? udp_desc : mips_desc, |
| 3138 | remote_timeout); |
| 3139 | if ((c == SERIAL_TIMEOUT) || (c != 0x06)) |
| 3140 | { |
| 3141 | fprintf_unfiltered (gdb_stderr, |
| 3142 | "Failed to receive valid ACK for %s\n", mesg); |
| 3143 | return (-1); /* terminate the download */ |
| 3144 | } |
| 3145 | } |
| 3146 | #endif /* DOETXACK */ |
| 3147 | return (0); |
| 3148 | } |
| 3149 | |
| 3150 | /* pmon_download - Send a sequence of characters to the PMON download port, |
| 3151 | which is either a serial port or a UDP socket. */ |
| 3152 | |
| 3153 | static void |
| 3154 | pmon_start_download (void) |
| 3155 | { |
| 3156 | if (tftp_in_use) |
| 3157 | { |
| 3158 | /* Create the temporary download file. */ |
| 3159 | if ((tftp_file = fopen (tftp_localname, "w")) == NULL) |
| 3160 | perror_with_name (tftp_localname); |
| 3161 | } |
| 3162 | else |
| 3163 | { |
| 3164 | mips_send_command (udp_in_use ? LOAD_CMD_UDP : LOAD_CMD, 0); |
| 3165 | mips_expect ("Downloading from "); |
| 3166 | mips_expect (udp_in_use ? "udp" : "tty0"); |
| 3167 | mips_expect (", ^C to abort\r\n"); |
| 3168 | } |
| 3169 | } |
| 3170 | |
| 3171 | static int |
| 3172 | mips_expect_download (char *string) |
| 3173 | { |
| 3174 | if (!mips_expect (string)) |
| 3175 | { |
| 3176 | fprintf_unfiltered (gdb_stderr, "Load did not complete successfully.\n"); |
| 3177 | if (tftp_in_use) |
| 3178 | remove (tftp_localname); /* Remove temporary file */ |
| 3179 | return 0; |
| 3180 | } |
| 3181 | else |
| 3182 | return 1; |
| 3183 | } |
| 3184 | |
| 3185 | static void |
| 3186 | pmon_check_entry_address (char *entry_address, int final) |
| 3187 | { |
| 3188 | char hexnumber[9]; /* includes '\0' space */ |
| 3189 | mips_expect_timeout (entry_address, tftp_in_use ? 15 : remote_timeout); |
| 3190 | sprintf (hexnumber, "%x", final); |
| 3191 | mips_expect (hexnumber); |
| 3192 | mips_expect ("\r\n"); |
| 3193 | } |
| 3194 | |
| 3195 | static int |
| 3196 | pmon_check_total (int bintotal) |
| 3197 | { |
| 3198 | char hexnumber[9]; /* includes '\0' space */ |
| 3199 | mips_expect ("\r\ntotal = 0x"); |
| 3200 | sprintf (hexnumber, "%x", bintotal); |
| 3201 | mips_expect (hexnumber); |
| 3202 | return mips_expect_download (" bytes\r\n"); |
| 3203 | } |
| 3204 | |
| 3205 | static void |
| 3206 | pmon_end_download (int final, int bintotal) |
| 3207 | { |
| 3208 | char hexnumber[9]; /* includes '\0' space */ |
| 3209 | |
| 3210 | if (tftp_in_use) |
| 3211 | { |
| 3212 | static char *load_cmd_prefix = "load -b -s "; |
| 3213 | char *cmd; |
| 3214 | struct stat stbuf; |
| 3215 | |
| 3216 | /* Close off the temporary file containing the load data. */ |
| 3217 | fclose (tftp_file); |
| 3218 | tftp_file = NULL; |
| 3219 | |
| 3220 | /* Make the temporary file readable by the world. */ |
| 3221 | if (stat (tftp_localname, &stbuf) == 0) |
| 3222 | chmod (tftp_localname, stbuf.st_mode | S_IROTH); |
| 3223 | |
| 3224 | /* Must reinitialize the board to prevent PMON from crashing. */ |
| 3225 | mips_send_command ("initEther\r", -1); |
| 3226 | |
| 3227 | /* Send the load command. */ |
| 3228 | cmd = xmalloc (strlen (load_cmd_prefix) + strlen (tftp_name) + 2); |
| 3229 | strcpy (cmd, load_cmd_prefix); |
| 3230 | strcat (cmd, tftp_name); |
| 3231 | strcat (cmd, "\r"); |
| 3232 | mips_send_command (cmd, 0); |
| 3233 | xfree (cmd); |
| 3234 | if (!mips_expect_download ("Downloading from ")) |
| 3235 | return; |
| 3236 | if (!mips_expect_download (tftp_name)) |
| 3237 | return; |
| 3238 | if (!mips_expect_download (", ^C to abort\r\n")) |
| 3239 | return; |
| 3240 | } |
| 3241 | |
| 3242 | /* Wait for the stuff that PMON prints after the load has completed. |
| 3243 | The timeout value for use in the tftp case (15 seconds) was picked |
| 3244 | arbitrarily but might be too small for really large downloads. FIXME. */ |
| 3245 | switch (mips_monitor) |
| 3246 | { |
| 3247 | case MON_LSI: |
| 3248 | pmon_check_ack ("termination"); |
| 3249 | pmon_check_entry_address ("Entry address is ", final); |
| 3250 | if (!pmon_check_total (bintotal)) |
| 3251 | return; |
| 3252 | break; |
| 3253 | default: |
| 3254 | pmon_check_entry_address ("Entry Address = ", final); |
| 3255 | pmon_check_ack ("termination"); |
| 3256 | if (!pmon_check_total (bintotal)) |
| 3257 | return; |
| 3258 | break; |
| 3259 | } |
| 3260 | |
| 3261 | if (tftp_in_use) |
| 3262 | remove (tftp_localname); /* Remove temporary file */ |
| 3263 | } |
| 3264 | |
| 3265 | static void |
| 3266 | pmon_download (char *buffer, int length) |
| 3267 | { |
| 3268 | if (tftp_in_use) |
| 3269 | fwrite (buffer, 1, length, tftp_file); |
| 3270 | else |
| 3271 | SERIAL_WRITE (udp_in_use ? udp_desc : mips_desc, buffer, length); |
| 3272 | } |
| 3273 | |
| 3274 | static void |
| 3275 | pmon_load_fast (char *file) |
| 3276 | { |
| 3277 | bfd *abfd; |
| 3278 | asection *s; |
| 3279 | unsigned char *binbuf; |
| 3280 | char *buffer; |
| 3281 | int reclen; |
| 3282 | unsigned int csum = 0; |
| 3283 | int hashmark = !tftp_in_use; |
| 3284 | int bintotal = 0; |
| 3285 | int final = 0; |
| 3286 | int finished = 0; |
| 3287 | |
| 3288 | buffer = (char *) xmalloc (MAXRECSIZE + 1); |
| 3289 | binbuf = (unsigned char *) xmalloc (BINCHUNK); |
| 3290 | |
| 3291 | abfd = bfd_openr (file, 0); |
| 3292 | if (!abfd) |
| 3293 | { |
| 3294 | printf_filtered ("Unable to open file %s\n", file); |
| 3295 | return; |
| 3296 | } |
| 3297 | |
| 3298 | if (bfd_check_format (abfd, bfd_object) == 0) |
| 3299 | { |
| 3300 | printf_filtered ("File is not an object file\n"); |
| 3301 | return; |
| 3302 | } |
| 3303 | |
| 3304 | /* Setup the required download state: */ |
| 3305 | mips_send_command ("set dlproto etxack\r", -1); |
| 3306 | mips_send_command ("set dlecho off\r", -1); |
| 3307 | /* NOTE: We get a "cannot set variable" message if the variable is |
| 3308 | already defined to have the argument we give. The code doesn't |
| 3309 | care, since it just scans to the next prompt anyway. */ |
| 3310 | /* Start the download: */ |
| 3311 | pmon_start_download (); |
| 3312 | |
| 3313 | /* Zero the checksum */ |
| 3314 | sprintf (buffer, "/Kxx\n"); |
| 3315 | reclen = strlen (buffer); |
| 3316 | pmon_download (buffer, reclen); |
| 3317 | finished = pmon_check_ack ("/Kxx"); |
| 3318 | |
| 3319 | for (s = abfd->sections; s && !finished; s = s->next) |
| 3320 | if (s->flags & SEC_LOAD) /* only deal with loadable sections */ |
| 3321 | { |
| 3322 | bintotal += s->_raw_size; |
| 3323 | final = (s->vma + s->_raw_size); |
| 3324 | |
| 3325 | printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s->name, (unsigned int) s->vma, |
| 3326 | (unsigned int) (s->vma + s->_raw_size)); |
| 3327 | gdb_flush (gdb_stdout); |
| 3328 | |
| 3329 | /* Output the starting address */ |
| 3330 | sprintf (buffer, "/A"); |
| 3331 | reclen = pmon_makeb64 (s->vma, &buffer[2], 36, &csum); |
| 3332 | buffer[2 + reclen] = '\n'; |
| 3333 | buffer[3 + reclen] = '\0'; |
| 3334 | reclen += 3; /* for the initial escape code and carriage return */ |
| 3335 | pmon_download (buffer, reclen); |
| 3336 | finished = pmon_check_ack ("/A"); |
| 3337 | |
| 3338 | if (!finished) |
| 3339 | { |
| 3340 | unsigned int binamount; |
| 3341 | unsigned int zerofill = 0; |
| 3342 | char *bp = buffer; |
| 3343 | unsigned int i; |
| 3344 | |
| 3345 | reclen = 0; |
| 3346 | |
| 3347 | for (i = 0; ((i < s->_raw_size) && !finished); i += binamount) |
| 3348 | { |
| 3349 | int binptr = 0; |
| 3350 | |
| 3351 | binamount = min (BINCHUNK, s->_raw_size - i); |
| 3352 | |
| 3353 | bfd_get_section_contents (abfd, s, binbuf, i, binamount); |
| 3354 | |
| 3355 | /* This keeps a rolling checksum, until we decide to output |
| 3356 | the line: */ |
| 3357 | for (; ((binamount - binptr) > 0);) |
| 3358 | { |
| 3359 | pmon_make_fastrec (&bp, binbuf, &binptr, binamount, &reclen, &csum, &zerofill); |
| 3360 | if (reclen >= (MAXRECSIZE - CHECKSIZE)) |
| 3361 | { |
| 3362 | reclen = pmon_checkset (reclen, &bp, &csum); |
| 3363 | pmon_download (buffer, reclen); |
| 3364 | finished = pmon_check_ack ("data record"); |
| 3365 | if (finished) |
| 3366 | { |
| 3367 | zerofill = 0; /* do not transmit pending zerofills */ |
| 3368 | break; |
| 3369 | } |
| 3370 | |
| 3371 | if (hashmark) |
| 3372 | { |
| 3373 | putchar_unfiltered ('#'); |
| 3374 | gdb_flush (gdb_stdout); |
| 3375 | } |
| 3376 | |
| 3377 | bp = buffer; |
| 3378 | reclen = 0; /* buffer processed */ |
| 3379 | } |
| 3380 | } |
| 3381 | } |
| 3382 | |
| 3383 | /* Ensure no out-standing zerofill requests: */ |
| 3384 | if (zerofill != 0) |
| 3385 | reclen = pmon_zeroset (reclen, &bp, &zerofill, &csum); |
| 3386 | |
| 3387 | /* and then flush the line: */ |
| 3388 | if (reclen > 0) |
| 3389 | { |
| 3390 | reclen = pmon_checkset (reclen, &bp, &csum); |
| 3391 | /* Currently pmon_checkset outputs the line terminator by |
| 3392 | default, so we write out the buffer so far: */ |
| 3393 | pmon_download (buffer, reclen); |
| 3394 | finished = pmon_check_ack ("record remnant"); |
| 3395 | } |
| 3396 | } |
| 3397 | |
| 3398 | putchar_unfiltered ('\n'); |
| 3399 | } |
| 3400 | |
| 3401 | /* Terminate the transfer. We know that we have an empty output |
| 3402 | buffer at this point. */ |
| 3403 | sprintf (buffer, "/E/E\n"); /* include dummy padding characters */ |
| 3404 | reclen = strlen (buffer); |
| 3405 | pmon_download (buffer, reclen); |
| 3406 | |
| 3407 | if (finished) |
| 3408 | { /* Ignore the termination message: */ |
| 3409 | SERIAL_FLUSH_INPUT (udp_in_use ? udp_desc : mips_desc); |
| 3410 | } |
| 3411 | else |
| 3412 | { /* Deal with termination message: */ |
| 3413 | pmon_end_download (final, bintotal); |
| 3414 | } |
| 3415 | |
| 3416 | return; |
| 3417 | } |
| 3418 | |
| 3419 | /* mips_load -- download a file. */ |
| 3420 | |
| 3421 | static void |
| 3422 | mips_load (char *file, int from_tty) |
| 3423 | { |
| 3424 | /* Get the board out of remote debugging mode. */ |
| 3425 | if (mips_exit_debug ()) |
| 3426 | error ("mips_load: Couldn't get into monitor mode."); |
| 3427 | |
| 3428 | if (mips_monitor != MON_IDT) |
| 3429 | pmon_load_fast (file); |
| 3430 | else |
| 3431 | mips_load_srec (file); |
| 3432 | |
| 3433 | mips_initialize (); |
| 3434 | |
| 3435 | /* Finally, make the PC point at the start address */ |
| 3436 | if (mips_monitor != MON_IDT) |
| 3437 | { |
| 3438 | /* Work around problem where PMON monitor updates the PC after a load |
| 3439 | to a different value than GDB thinks it has. The following ensures |
| 3440 | that the write_pc() WILL update the PC value: */ |
| 3441 | register_valid[PC_REGNUM] = 0; |
| 3442 | } |
| 3443 | if (exec_bfd) |
| 3444 | write_pc (bfd_get_start_address (exec_bfd)); |
| 3445 | |
| 3446 | inferior_pid = 0; /* No process now */ |
| 3447 | |
| 3448 | /* This is necessary because many things were based on the PC at the time that |
| 3449 | we attached to the monitor, which is no longer valid now that we have loaded |
| 3450 | new code (and just changed the PC). Another way to do this might be to call |
| 3451 | normal_stop, except that the stack may not be valid, and things would get |
| 3452 | horribly confused... */ |
| 3453 | |
| 3454 | clear_symtab_users (); |
| 3455 | } |
| 3456 | |
| 3457 | |
| 3458 | /* Pass the command argument as a packet to PMON verbatim. */ |
| 3459 | |
| 3460 | static void |
| 3461 | pmon_command (char *args, int from_tty) |
| 3462 | { |
| 3463 | char buf[DATA_MAXLEN + 1]; |
| 3464 | int rlen; |
| 3465 | |
| 3466 | sprintf (buf, "0x0 %s", args); |
| 3467 | mips_send_packet (buf, 1); |
| 3468 | printf_filtered ("Send packet: %s\n", buf); |
| 3469 | |
| 3470 | rlen = mips_receive_packet (buf, 1, mips_receive_wait); |
| 3471 | buf[rlen] = '\0'; |
| 3472 | printf_filtered ("Received packet: %s\n", buf); |
| 3473 | } |
| 3474 | \f |
| 3475 | void |
| 3476 | _initialize_remote_mips (void) |
| 3477 | { |
| 3478 | /* Initialize the fields in mips_ops that are common to all four targets. */ |
| 3479 | mips_ops.to_longname = "Remote MIPS debugging over serial line"; |
| 3480 | mips_ops.to_close = mips_close; |
| 3481 | mips_ops.to_detach = mips_detach; |
| 3482 | mips_ops.to_resume = mips_resume; |
| 3483 | mips_ops.to_fetch_registers = mips_fetch_registers; |
| 3484 | mips_ops.to_store_registers = mips_store_registers; |
| 3485 | mips_ops.to_prepare_to_store = mips_prepare_to_store; |
| 3486 | mips_ops.to_xfer_memory = mips_xfer_memory; |
| 3487 | mips_ops.to_files_info = mips_files_info; |
| 3488 | mips_ops.to_insert_breakpoint = mips_insert_breakpoint; |
| 3489 | mips_ops.to_remove_breakpoint = mips_remove_breakpoint; |
| 3490 | mips_ops.to_kill = mips_kill; |
| 3491 | mips_ops.to_load = mips_load; |
| 3492 | mips_ops.to_create_inferior = mips_create_inferior; |
| 3493 | mips_ops.to_mourn_inferior = mips_mourn_inferior; |
| 3494 | mips_ops.to_stratum = process_stratum; |
| 3495 | mips_ops.to_has_all_memory = 1; |
| 3496 | mips_ops.to_has_memory = 1; |
| 3497 | mips_ops.to_has_stack = 1; |
| 3498 | mips_ops.to_has_registers = 1; |
| 3499 | mips_ops.to_has_execution = 1; |
| 3500 | mips_ops.to_magic = OPS_MAGIC; |
| 3501 | |
| 3502 | /* Copy the common fields to all four target vectors. */ |
| 3503 | pmon_ops = ddb_ops = lsi_ops = mips_ops; |
| 3504 | |
| 3505 | /* Initialize target-specific fields in the target vectors. */ |
| 3506 | mips_ops.to_shortname = "mips"; |
| 3507 | mips_ops.to_doc = "\ |
| 3508 | Debug a board using the MIPS remote debugging protocol over a serial line.\n\ |
| 3509 | The argument is the device it is connected to or, if it contains a colon,\n\ |
| 3510 | HOST:PORT to access a board over a network"; |
| 3511 | mips_ops.to_open = mips_open; |
| 3512 | mips_ops.to_wait = mips_wait; |
| 3513 | |
| 3514 | pmon_ops.to_shortname = "pmon"; |
| 3515 | pmon_ops.to_doc = "\ |
| 3516 | Debug a board using the PMON MIPS remote debugging protocol over a serial\n\ |
| 3517 | line. The argument is the device it is connected to or, if it contains a\n\ |
| 3518 | colon, HOST:PORT to access a board over a network"; |
| 3519 | pmon_ops.to_open = pmon_open; |
| 3520 | pmon_ops.to_wait = mips_wait; |
| 3521 | |
| 3522 | ddb_ops.to_shortname = "ddb"; |
| 3523 | ddb_ops.to_doc = "\ |
| 3524 | Debug a board using the PMON MIPS remote debugging protocol over a serial\n\ |
| 3525 | line. The first argument is the device it is connected to or, if it contains\n\ |
| 3526 | a colon, HOST:PORT to access a board over a network. The optional second\n\ |
| 3527 | parameter is the temporary file in the form HOST:FILENAME to be used for\n\ |
| 3528 | TFTP downloads to the board. The optional third parameter is the local name\n\ |
| 3529 | of the TFTP temporary file, if it differs from the filename seen by the board."; |
| 3530 | ddb_ops.to_open = ddb_open; |
| 3531 | ddb_ops.to_wait = mips_wait; |
| 3532 | |
| 3533 | lsi_ops.to_shortname = "lsi"; |
| 3534 | lsi_ops.to_doc = pmon_ops.to_doc; |
| 3535 | lsi_ops.to_open = lsi_open; |
| 3536 | lsi_ops.to_wait = mips_wait; |
| 3537 | |
| 3538 | /* Add the targets. */ |
| 3539 | add_target (&mips_ops); |
| 3540 | add_target (&pmon_ops); |
| 3541 | add_target (&ddb_ops); |
| 3542 | add_target (&lsi_ops); |
| 3543 | |
| 3544 | add_show_from_set ( |
| 3545 | add_set_cmd ("timeout", no_class, var_zinteger, |
| 3546 | (char *) &mips_receive_wait, |
| 3547 | "Set timeout in seconds for remote MIPS serial I/O.", |
| 3548 | &setlist), |
| 3549 | &showlist); |
| 3550 | |
| 3551 | add_show_from_set ( |
| 3552 | add_set_cmd ("retransmit-timeout", no_class, var_zinteger, |
| 3553 | (char *) &mips_retransmit_wait, |
| 3554 | "Set retransmit timeout in seconds for remote MIPS serial I/O.\n\ |
| 3555 | This is the number of seconds to wait for an acknowledgement to a packet\n\ |
| 3556 | before resending the packet.", &setlist), |
| 3557 | &showlist); |
| 3558 | |
| 3559 | add_show_from_set ( |
| 3560 | add_set_cmd ("syn-garbage-limit", no_class, var_zinteger, |
| 3561 | (char *) &mips_syn_garbage, |
| 3562 | "Set the maximum number of characters to ignore when scanning for a SYN.\n\ |
| 3563 | This is the maximum number of characters GDB will ignore when trying to\n\ |
| 3564 | synchronize with the remote system. A value of -1 means that there is no limit\n\ |
| 3565 | (Note that these characters are printed out even though they are ignored.)", |
| 3566 | &setlist), |
| 3567 | &showlist); |
| 3568 | |
| 3569 | add_show_from_set |
| 3570 | (add_set_cmd ("monitor-prompt", class_obscure, var_string, |
| 3571 | (char *) &mips_monitor_prompt, |
| 3572 | "Set the prompt that GDB expects from the monitor.", |
| 3573 | &setlist), |
| 3574 | &showlist); |
| 3575 | |
| 3576 | add_show_from_set ( |
| 3577 | add_set_cmd ("monitor-warnings", class_obscure, var_zinteger, |
| 3578 | (char *) &monitor_warnings, |
| 3579 | "Set printing of monitor warnings.\n" |
| 3580 | "When enabled, monitor warnings about hardware breakpoints " |
| 3581 | "will be displayed.", |
| 3582 | &setlist), |
| 3583 | &showlist); |
| 3584 | |
| 3585 | add_com ("pmon <command>", class_obscure, pmon_command, |
| 3586 | "Send a packet to PMON (must be in debug mode)."); |
| 3587 | |
| 3588 | add_show_from_set (add_set_cmd ("mask-address", no_class, |
| 3589 | var_boolean, &mask_address_p, |
| 3590 | "Set zeroing of upper 32 bits of 64-bit addresses when talking to PMON targets.\n\ |
| 3591 | Use \"on\" to enable the masking and \"off\" to disable it.\n", |
| 3592 | &setlist), |
| 3593 | &showlist); |
| 3594 | } |