Commit | Line | Data |
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33742334 | 1 | /* Remote debugging interface for MIPS remote debugging protocol. |
4887063b | 2 | Copyright 1993, 1994, 1995 Free Software Foundation, Inc. |
33742334 ILT |
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 | |
6c9638b4 | 20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
33742334 ILT |
21 | |
22 | #include "defs.h" | |
23 | #include "inferior.h" | |
24 | #include "bfd.h" | |
77641260 | 25 | #include "symfile.h" |
33742334 ILT |
26 | #include "wait.h" |
27 | #include "gdbcmd.h" | |
28 | #include "gdbcore.h" | |
29 | #include "serial.h" | |
30 | #include "target.h" | |
66a48870 | 31 | #include "remote-utils.h" |
33742334 ILT |
32 | |
33 | #include <signal.h> | |
73d3dbd4 | 34 | #ifdef ANSI_PROTOTYPES |
85c613aa C |
35 | #include <stdarg.h> |
36 | #else | |
96e5f161 | 37 | #include <varargs.h> |
85c613aa | 38 | #endif |
ae55bdbc | 39 | |
ae55bdbc SS |
40 | extern void mips_set_processor_type_command PARAMS ((char *, int)); |
41 | ||
33742334 ILT |
42 | \f |
43 | /* Prototypes for local functions. */ | |
44 | ||
ae55bdbc | 45 | static int mips_readchar PARAMS ((int timeout)); |
33742334 | 46 | |
ae55bdbc SS |
47 | static int mips_receive_header PARAMS ((unsigned char *hdr, int *pgarbage, |
48 | int ch, int timeout)); | |
33742334 | 49 | |
ae55bdbc SS |
50 | static int mips_receive_trailer PARAMS ((unsigned char *trlr, int *pgarbage, |
51 | int *pch, int timeout)); | |
33742334 ILT |
52 | |
53 | static int mips_cksum PARAMS ((const unsigned char *hdr, | |
54 | const unsigned char *data, | |
55 | int len)); | |
56 | ||
ae55bdbc | 57 | static void mips_send_packet PARAMS ((const char *s, int get_ack)); |
33742334 | 58 | |
090d784a JSC |
59 | static void mips_send_command PARAMS ((const char *cmd, int prompt)); |
60 | ||
4c6071f7 JK |
61 | static int mips_receive_packet PARAMS ((char *buff, int throw_error, |
62 | int timeout)); | |
33742334 | 63 | |
cd10c7e3 SG |
64 | static int mips_request PARAMS ((int cmd, unsigned int addr, |
65 | unsigned int data, int *perr, int timeout, | |
66 | char *buff)); | |
33742334 | 67 | |
ae55bdbc | 68 | static void mips_initialize PARAMS ((void)); |
c2a0f1cb | 69 | |
ae55bdbc | 70 | static void mips_open PARAMS ((char *name, int from_tty)); |
33742334 | 71 | |
090d784a JSC |
72 | static void pmon_open PARAMS ((char *name, int from_tty)); |
73 | ||
5dad8312 | 74 | static void ddb_open PARAMS ((char *name, int from_tty)); |
51328506 | 75 | |
ae55bdbc | 76 | static void mips_close PARAMS ((int quitting)); |
33742334 | 77 | |
ae55bdbc | 78 | static void mips_detach PARAMS ((char *args, int from_tty)); |
33742334 | 79 | |
67ac9759 JK |
80 | static void mips_resume PARAMS ((int pid, int step, |
81 | enum target_signal siggnal)); | |
33742334 | 82 | |
ae55bdbc | 83 | static int mips_wait PARAMS ((int pid, struct target_waitstatus *status)); |
33742334 | 84 | |
090d784a JSC |
85 | static int pmon_wait PARAMS ((int pid, struct target_waitstatus *status)); |
86 | ||
ae55bdbc | 87 | static int mips_map_regno PARAMS ((int regno)); |
33742334 | 88 | |
ae55bdbc | 89 | static void mips_fetch_registers PARAMS ((int regno)); |
33742334 | 90 | |
ae55bdbc | 91 | static void mips_prepare_to_store PARAMS ((void)); |
33742334 | 92 | |
ae55bdbc | 93 | static void mips_store_registers PARAMS ((int regno)); |
33742334 | 94 | |
ae55bdbc | 95 | static int mips_fetch_word PARAMS ((CORE_ADDR addr)); |
33742334 | 96 | |
ae55bdbc SS |
97 | static int mips_store_word PARAMS ((CORE_ADDR addr, int value, |
98 | char *old_contents)); | |
33742334 | 99 | |
ae55bdbc SS |
100 | static int mips_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, int len, |
101 | int write, struct target_ops *ignore)); | |
33742334 | 102 | |
ae55bdbc | 103 | static void mips_files_info PARAMS ((struct target_ops *ignore)); |
33742334 | 104 | |
ae55bdbc SS |
105 | static void mips_create_inferior PARAMS ((char *execfile, char *args, |
106 | char **env)); | |
33742334 | 107 | |
ae55bdbc | 108 | static void mips_mourn_inferior PARAMS ((void)); |
33742334 | 109 | |
090d784a JSC |
110 | static int pmon_makeb64 PARAMS ((unsigned long v, char *p, int n, int *chksum)); |
111 | ||
112 | static int pmon_zeroset PARAMS ((int recsize, char **buff, int *amount, | |
113 | unsigned int *chksum)); | |
114 | ||
115 | static int pmon_checkset PARAMS ((int recsize, char **buff, int *value)); | |
116 | ||
117 | static void pmon_make_fastrec PARAMS ((char **outbuf, unsigned char *inbuf, | |
118 | int *inptr, int inamount, int *recsize, | |
119 | unsigned int *csum, unsigned int *zerofill)); | |
120 | ||
121 | static int pmon_check_ack PARAMS ((void)); | |
122 | ||
123 | static void pmon_load_fast PARAMS ((char *file)); | |
124 | ||
4704fd9c SG |
125 | static void mips_load PARAMS ((char *file, int from_tty)); |
126 | ||
cd10c7e3 | 127 | static int mips_make_srec PARAMS ((char *buffer, int type, CORE_ADDR memaddr, |
4704fd9c SG |
128 | unsigned char *myaddr, int len)); |
129 | ||
cd10c7e3 SG |
130 | static int common_breakpoint PARAMS ((int cmd, CORE_ADDR addr, CORE_ADDR mask, |
131 | char *flags)); | |
090d784a JSC |
132 | |
133 | static void common_open PARAMS ((struct target_ops *ops, char *name, | |
134 | int from_tty)); | |
135 | /* Forward declarations. */ | |
33742334 | 136 | extern struct target_ops mips_ops; |
090d784a | 137 | extern struct target_ops pmon_ops; |
5dad8312 | 138 | extern struct target_ops ddb_ops; |
33742334 ILT |
139 | \f |
140 | /* The MIPS remote debugging interface is built on top of a simple | |
141 | packet protocol. Each packet is organized as follows: | |
142 | ||
143 | SYN The first character is always a SYN (ASCII 026, or ^V). SYN | |
144 | may not appear anywhere else in the packet. Any time a SYN is | |
145 | seen, a new packet should be assumed to have begun. | |
146 | ||
147 | TYPE_LEN | |
148 | This byte contains the upper five bits of the logical length | |
149 | of the data section, plus a single bit indicating whether this | |
150 | is a data packet or an acknowledgement. The documentation | |
151 | indicates that this bit is 1 for a data packet, but the actual | |
152 | board uses 1 for an acknowledgement. The value of the byte is | |
153 | 0x40 + (ack ? 0x20 : 0) + (len >> 6) | |
154 | (we always have 0 <= len < 1024). Acknowledgement packets do | |
155 | not carry data, and must have a data length of 0. | |
156 | ||
157 | LEN1 This byte contains the lower six bits of the logical length of | |
158 | the data section. The value is | |
159 | 0x40 + (len & 0x3f) | |
160 | ||
161 | SEQ This byte contains the six bit sequence number of the packet. | |
162 | The value is | |
163 | 0x40 + seq | |
164 | An acknowlegment packet contains the sequence number of the | |
4887063b | 165 | packet being acknowledged plus 1 modulo 64. Data packets are |
33742334 ILT |
166 | transmitted in sequence. There may only be one outstanding |
167 | unacknowledged data packet at a time. The sequence numbers | |
168 | are independent in each direction. If an acknowledgement for | |
169 | the previous packet is received (i.e., an acknowledgement with | |
170 | the sequence number of the packet just sent) the packet just | |
171 | sent should be retransmitted. If no acknowledgement is | |
172 | received within a timeout period, the packet should be | |
173 | retransmitted. This has an unfortunate failure condition on a | |
174 | high-latency line, as a delayed acknowledgement may lead to an | |
175 | endless series of duplicate packets. | |
176 | ||
177 | DATA The actual data bytes follow. The following characters are | |
178 | escaped inline with DLE (ASCII 020, or ^P): | |
179 | SYN (026) DLE S | |
180 | DLE (020) DLE D | |
181 | ^C (003) DLE C | |
182 | ^S (023) DLE s | |
183 | ^Q (021) DLE q | |
184 | The additional DLE characters are not counted in the logical | |
185 | length stored in the TYPE_LEN and LEN1 bytes. | |
186 | ||
187 | CSUM1 | |
188 | CSUM2 | |
189 | CSUM3 | |
190 | These bytes contain an 18 bit checksum of the complete | |
191 | contents of the packet excluding the SEQ byte and the | |
192 | CSUM[123] bytes. The checksum is simply the twos complement | |
193 | addition of all the bytes treated as unsigned characters. The | |
194 | values of the checksum bytes are: | |
195 | CSUM1: 0x40 + ((cksum >> 12) & 0x3f) | |
196 | CSUM2: 0x40 + ((cksum >> 6) & 0x3f) | |
197 | CSUM3: 0x40 + (cksum & 0x3f) | |
198 | ||
199 | It happens that the MIPS remote debugging protocol always | |
200 | communicates with ASCII strings. Because of this, this | |
201 | implementation doesn't bother to handle the DLE quoting mechanism, | |
202 | since it will never be required. */ | |
203 | ||
204 | /* The SYN character which starts each packet. */ | |
205 | #define SYN '\026' | |
206 | ||
207 | /* The 0x40 used to offset each packet (this value ensures that all of | |
208 | the header and trailer bytes, other than SYN, are printable ASCII | |
209 | characters). */ | |
210 | #define HDR_OFFSET 0x40 | |
211 | ||
212 | /* The indices of the bytes in the packet header. */ | |
213 | #define HDR_INDX_SYN 0 | |
214 | #define HDR_INDX_TYPE_LEN 1 | |
215 | #define HDR_INDX_LEN1 2 | |
216 | #define HDR_INDX_SEQ 3 | |
217 | #define HDR_LENGTH 4 | |
218 | ||
219 | /* The data/ack bit in the TYPE_LEN header byte. */ | |
220 | #define TYPE_LEN_DA_BIT 0x20 | |
221 | #define TYPE_LEN_DATA 0 | |
222 | #define TYPE_LEN_ACK TYPE_LEN_DA_BIT | |
223 | ||
224 | /* How to compute the header bytes. */ | |
225 | #define HDR_SET_SYN(data, len, seq) (SYN) | |
226 | #define HDR_SET_TYPE_LEN(data, len, seq) \ | |
227 | (HDR_OFFSET \ | |
228 | + ((data) ? TYPE_LEN_DATA : TYPE_LEN_ACK) \ | |
229 | + (((len) >> 6) & 0x1f)) | |
230 | #define HDR_SET_LEN1(data, len, seq) (HDR_OFFSET + ((len) & 0x3f)) | |
231 | #define HDR_SET_SEQ(data, len, seq) (HDR_OFFSET + (seq)) | |
232 | ||
233 | /* Check that a header byte is reasonable. */ | |
234 | #define HDR_CHECK(ch) (((ch) & HDR_OFFSET) == HDR_OFFSET) | |
235 | ||
236 | /* Get data from the header. These macros evaluate their argument | |
237 | multiple times. */ | |
238 | #define HDR_IS_DATA(hdr) \ | |
239 | (((hdr)[HDR_INDX_TYPE_LEN] & TYPE_LEN_DA_BIT) == TYPE_LEN_DATA) | |
240 | #define HDR_GET_LEN(hdr) \ | |
241 | ((((hdr)[HDR_INDX_TYPE_LEN] & 0x1f) << 6) + (((hdr)[HDR_INDX_LEN1] & 0x3f))) | |
242 | #define HDR_GET_SEQ(hdr) ((hdr)[HDR_INDX_SEQ] & 0x3f) | |
243 | ||
244 | /* The maximum data length. */ | |
245 | #define DATA_MAXLEN 1023 | |
246 | ||
247 | /* The trailer offset. */ | |
248 | #define TRLR_OFFSET HDR_OFFSET | |
249 | ||
250 | /* The indices of the bytes in the packet trailer. */ | |
251 | #define TRLR_INDX_CSUM1 0 | |
252 | #define TRLR_INDX_CSUM2 1 | |
253 | #define TRLR_INDX_CSUM3 2 | |
254 | #define TRLR_LENGTH 3 | |
255 | ||
256 | /* How to compute the trailer bytes. */ | |
257 | #define TRLR_SET_CSUM1(cksum) (TRLR_OFFSET + (((cksum) >> 12) & 0x3f)) | |
258 | #define TRLR_SET_CSUM2(cksum) (TRLR_OFFSET + (((cksum) >> 6) & 0x3f)) | |
259 | #define TRLR_SET_CSUM3(cksum) (TRLR_OFFSET + (((cksum) ) & 0x3f)) | |
260 | ||
261 | /* Check that a trailer byte is reasonable. */ | |
262 | #define TRLR_CHECK(ch) (((ch) & TRLR_OFFSET) == TRLR_OFFSET) | |
263 | ||
264 | /* Get data from the trailer. This evaluates its argument multiple | |
265 | times. */ | |
266 | #define TRLR_GET_CKSUM(trlr) \ | |
267 | ((((trlr)[TRLR_INDX_CSUM1] & 0x3f) << 12) \ | |
268 | + (((trlr)[TRLR_INDX_CSUM2] & 0x3f) << 6) \ | |
269 | + ((trlr)[TRLR_INDX_CSUM3] & 0x3f)) | |
270 | ||
271 | /* The sequence number modulos. */ | |
272 | #define SEQ_MODULOS (64) | |
273 | ||
090d784a JSC |
274 | enum mips_monitor_type { |
275 | /* IDT/SIM monitor being used: */ | |
276 | MON_IDT, | |
277 | /* PMON monitor being used: */ | |
51328506 | 278 | MON_PMON, /* 3.0.83 [COGENT,EB,FP,NET] Algorithmics Ltd. Nov 9 1995 17:19:50 */ |
5dad8312 | 279 | MON_DDB, /* 2.7.473 [DDBVR4300,EL,FP,NET] Risq Modular Systems, Thu Jun 6 09:28:40 PDT 1996 */ |
090d784a JSC |
280 | /* Last and unused value, for sizing vectors, etc. */ |
281 | MON_LAST | |
282 | }; | |
283 | static enum mips_monitor_type mips_monitor = MON_LAST; | |
284 | ||
285 | /* The default monitor prompt text: */ | |
286 | static char *mips_monitor_prompt = TARGET_MONITOR_PROMPT; | |
287 | /* For the Cogent PMON world this is still not ideal. The default | |
288 | prompt is "PMON> ", unfortunately the user can change the prompt | |
289 | and the new prompt will survive over a power-cycle (EEPROM). This | |
290 | means that the code should really force the monitor prompt to a | |
291 | known value as the very first action, and that the | |
292 | "mips_monitor_prompt" support is not needed... since the prompt | |
293 | could be explicitly set to TARGET_MONITOR_PROMPT (even though it | |
294 | may be the prompt for a different monitor). However, this will | |
295 | require changing the mips_initialize reset sequence. (TODO) */ | |
296 | ||
33742334 ILT |
297 | /* Set to 1 if the target is open. */ |
298 | static int mips_is_open; | |
299 | ||
090d784a JSC |
300 | /* Currently active target description (if mips_is_open == 1) */ |
301 | static struct target_ops *current_ops; | |
302 | ||
c2a0f1cb ILT |
303 | /* Set to 1 while the connection is being initialized. */ |
304 | static int mips_initializing; | |
305 | ||
33742334 | 306 | /* The next sequence number to send. */ |
090d784a | 307 | static unsigned int mips_send_seq; |
33742334 ILT |
308 | |
309 | /* The next sequence number we expect to receive. */ | |
090d784a | 310 | static unsigned int mips_receive_seq; |
33742334 ILT |
311 | |
312 | /* The time to wait before retransmitting a packet, in seconds. */ | |
313 | static int mips_retransmit_wait = 3; | |
314 | ||
315 | /* The number of times to try retransmitting a packet before giving up. */ | |
316 | static int mips_send_retries = 10; | |
317 | ||
318 | /* The number of garbage characters to accept when looking for an | |
319 | SYN for the next packet. */ | |
320 | static int mips_syn_garbage = 1050; | |
321 | ||
322 | /* The time to wait for a packet, in seconds. */ | |
c2a0f1cb | 323 | static int mips_receive_wait = 5; |
33742334 ILT |
324 | |
325 | /* Set if we have sent a packet to the board but have not yet received | |
326 | a reply. */ | |
327 | static int mips_need_reply = 0; | |
328 | ||
1724c671 SG |
329 | /* Handle used to access serial I/O stream. */ |
330 | static serial_t mips_desc; | |
331 | ||
cd10c7e3 SG |
332 | /* Counts the number of times the user tried to interrupt the target (usually |
333 | via ^C. */ | |
334 | static int interrupt_count; | |
335 | ||
336 | /* If non-zero, means that the target is running. */ | |
337 | static int mips_wait_flag = 0; | |
338 | ||
339 | /* If non-zero, monitor supports breakpoint commands. */ | |
340 | static monitor_supports_breakpoints = 0; | |
341 | ||
342 | /* Data cache header. */ | |
343 | ||
344 | static DCACHE *mips_dcache; | |
345 | ||
346 | /* Non-zero means that we've just hit a read or write watchpoint */ | |
347 | static int hit_watchpoint; | |
348 | ||
4fb192be JK |
349 | /* Handle low-level error that we can't recover from. Note that just |
350 | error()ing out from target_wait or some such low-level place will cause | |
351 | all hell to break loose--the rest of GDB will tend to get left in an | |
352 | inconsistent state. */ | |
353 | ||
2b9fbee4 | 354 | static NORETURN void |
73d3dbd4 | 355 | #ifdef ANSI_PROTOTYPES |
85c613aa C |
356 | mips_error (char *string, ...) |
357 | #else | |
4fb192be JK |
358 | mips_error (va_alist) |
359 | va_dcl | |
85c613aa | 360 | #endif |
4fb192be JK |
361 | { |
362 | va_list args; | |
4fb192be | 363 | |
73d3dbd4 | 364 | #ifdef ANSI_PROTOTYPES |
85c613aa C |
365 | va_start (args, string); |
366 | #else | |
367 | char *string; | |
4fb192be | 368 | va_start (args); |
85c613aa C |
369 | string = va_arg (args, char *); |
370 | #endif | |
371 | ||
4fb192be JK |
372 | target_terminal_ours (); |
373 | wrap_here(""); /* Force out any buffered output */ | |
374 | gdb_flush (gdb_stdout); | |
375 | if (error_pre_print) | |
376 | fprintf_filtered (gdb_stderr, error_pre_print); | |
4fb192be JK |
377 | vfprintf_filtered (gdb_stderr, string, args); |
378 | fprintf_filtered (gdb_stderr, "\n"); | |
379 | va_end (args); | |
cd10c7e3 | 380 | gdb_flush (gdb_stderr); |
4fb192be | 381 | |
96e5f161 JK |
382 | /* Clean up in such a way that mips_close won't try to talk to the |
383 | board (it almost surely won't work since we weren't able to talk to | |
384 | it). */ | |
385 | mips_is_open = 0; | |
386 | SERIAL_CLOSE (mips_desc); | |
387 | ||
388 | printf_unfiltered ("Ending remote MIPS debugging.\n"); | |
4fb192be JK |
389 | target_mourn_inferior (); |
390 | ||
391 | return_to_top_level (RETURN_ERROR); | |
392 | } | |
393 | ||
cd10c7e3 SG |
394 | /* Wait until STRING shows up in mips_desc. Returns 1 if successful, else 0 if |
395 | timed out. */ | |
396 | ||
4704fd9c SG |
397 | int |
398 | mips_expect (string) | |
399 | char *string; | |
400 | { | |
401 | char *p = string; | |
4704fd9c SG |
402 | |
403 | immediate_quit = 1; | |
404 | while (1) | |
405 | { | |
090d784a | 406 | int c; |
4704fd9c SG |
407 | |
408 | /* Must use SERIAL_READCHAR here cuz mips_readchar would get confused if we | |
090d784a | 409 | were waiting for the mips_monitor_prompt... */ |
4704fd9c SG |
410 | |
411 | c = SERIAL_READCHAR (mips_desc, 2); | |
412 | ||
413 | if (c == SERIAL_TIMEOUT) | |
414 | return 0; | |
415 | ||
416 | if (c == *p++) | |
417 | { | |
418 | if (*p == '\0') | |
419 | { | |
420 | immediate_quit = 0; | |
4704fd9c SG |
421 | return 1; |
422 | } | |
423 | } | |
424 | else | |
425 | { | |
426 | p = string; | |
427 | if (c == *p) | |
428 | p++; | |
429 | } | |
430 | } | |
431 | } | |
432 | ||
090d784a JSC |
433 | /* Read the required number of characters into the given buffer (which |
434 | is assumed to be large enough). The only failure is a timeout. */ | |
435 | int | |
436 | mips_getstring (string, n) | |
437 | char *string; | |
438 | int n; | |
439 | { | |
440 | char *p = string; | |
441 | int c; | |
442 | ||
443 | immediate_quit = 1; | |
444 | while (n > 0) | |
445 | { | |
446 | c = SERIAL_READCHAR (mips_desc, 2); | |
447 | ||
448 | if (c == SERIAL_TIMEOUT) { | |
449 | fprintf_unfiltered (stderr, "Failed to read %d characters from target (TIMEOUT)\n", n); | |
450 | return 0; | |
451 | } | |
452 | ||
453 | *p++ = c; | |
454 | n--; | |
455 | } | |
456 | ||
457 | return 1; | |
458 | } | |
459 | ||
9a9a88c1 ILT |
460 | /* Read a character from the remote, aborting on error. Returns |
461 | SERIAL_TIMEOUT on timeout (since that's what SERIAL_READCHAR | |
090d784a | 462 | returns). FIXME: If we see the string mips_monitor_prompt from |
0e3a4b1e JSC |
463 | the board, then we are debugging on the main console port, and we |
464 | have somehow dropped out of remote debugging mode. In this case, | |
465 | we automatically go back in to remote debugging mode. This is a | |
466 | hack, put in because I can't find any way for a program running on | |
467 | the remote board to terminate without also ending remote debugging | |
9a9a88c1 ILT |
468 | mode. I assume users won't have any trouble with this; for one |
469 | thing, the IDT documentation generally assumes that the remote | |
470 | debugging port is not the console port. This is, however, very | |
471 | convenient for DejaGnu when you only have one connected serial | |
472 | port. */ | |
33742334 ILT |
473 | |
474 | static int | |
475 | mips_readchar (timeout) | |
476 | int timeout; | |
477 | { | |
478 | int ch; | |
c2a0f1cb | 479 | static int state = 0; |
090d784a JSC |
480 | static int mips_monitor_prompt_len = -1; |
481 | ||
482 | /* NASTY, since we assume that the prompt does not change after the | |
483 | first mips_readchar call: */ | |
484 | if (mips_monitor_prompt_len = -1) | |
485 | mips_monitor_prompt_len = strlen(mips_monitor_prompt); | |
486 | ||
4887063b | 487 | #ifdef MAINTENANCE_CMDS |
090d784a JSC |
488 | { |
489 | int i; | |
4887063b | 490 | |
090d784a JSC |
491 | i = timeout; |
492 | if (i == -1 && watchdog > 0) | |
493 | i = watchdog; | |
494 | } | |
4887063b | 495 | #endif |
33742334 | 496 | |
090d784a | 497 | if (state == mips_monitor_prompt_len) |
b0a0ee52 | 498 | timeout = 1; |
1724c671 | 499 | ch = SERIAL_READCHAR (mips_desc, timeout); |
4887063b SG |
500 | #ifdef MAINTENANCE_CMDS |
501 | if (ch == SERIAL_TIMEOUT && timeout == -1) /* Watchdog went off */ | |
502 | { | |
503 | target_mourn_inferior (); | |
504 | error ("Watchdog has expired. Target detached.\n"); | |
505 | } | |
506 | #endif | |
1724c671 | 507 | if (ch == SERIAL_EOF) |
4fb192be | 508 | mips_error ("End of file from remote"); |
1724c671 | 509 | if (ch == SERIAL_ERROR) |
4fb192be | 510 | mips_error ("Error reading from remote: %s", safe_strerror (errno)); |
cd10c7e3 | 511 | if (remote_debug > 1) |
33742334 | 512 | { |
47d52968 JK |
513 | /* Don't use _filtered; we can't deal with a QUIT out of |
514 | target_wait, and I think this might be called from there. */ | |
1724c671 | 515 | if (ch != SERIAL_TIMEOUT) |
47d52968 | 516 | printf_unfiltered ("Read '%c' %d 0x%x\n", ch, ch, ch); |
33742334 | 517 | else |
47d52968 | 518 | printf_unfiltered ("Timed out in read\n"); |
33742334 | 519 | } |
c2a0f1cb | 520 | |
090d784a | 521 | /* If we have seen mips_monitor_prompt and we either time out, or |
0e3a4b1e JSC |
522 | we see a @ (which was echoed from a packet we sent), reset the |
523 | board as described above. The first character in a packet after | |
524 | the SYN (which is not echoed) is always an @ unless the packet is | |
525 | more than 64 characters long, which ours never are. */ | |
1724c671 | 526 | if ((ch == SERIAL_TIMEOUT || ch == '@') |
090d784a | 527 | && state == mips_monitor_prompt_len |
c2a0f1cb ILT |
528 | && ! mips_initializing) |
529 | { | |
cd10c7e3 | 530 | if (remote_debug > 0) |
47d52968 JK |
531 | /* Don't use _filtered; we can't deal with a QUIT out of |
532 | target_wait, and I think this might be called from there. */ | |
533 | printf_unfiltered ("Reinitializing MIPS debugging mode\n"); | |
c2a0f1cb ILT |
534 | |
535 | mips_need_reply = 0; | |
536 | mips_initialize (); | |
537 | ||
538 | state = 0; | |
539 | ||
4887063b SG |
540 | /* At this point, about the only thing we can do is abort the command |
541 | in progress and get back to command level as quickly as possible. */ | |
542 | ||
543 | error ("Remote board reset, debug protocol re-initialized."); | |
c2a0f1cb ILT |
544 | } |
545 | ||
090d784a | 546 | if (ch == mips_monitor_prompt[state]) |
c2a0f1cb ILT |
547 | ++state; |
548 | else | |
549 | state = 0; | |
550 | ||
33742334 ILT |
551 | return ch; |
552 | } | |
553 | ||
554 | /* Get a packet header, putting the data in the supplied buffer. | |
555 | PGARBAGE is a pointer to the number of garbage characters received | |
556 | so far. CH is the last character received. Returns 0 for success, | |
557 | or -1 for timeout. */ | |
558 | ||
559 | static int | |
560 | mips_receive_header (hdr, pgarbage, ch, timeout) | |
561 | unsigned char *hdr; | |
562 | int *pgarbage; | |
563 | int ch; | |
564 | int timeout; | |
565 | { | |
566 | int i; | |
567 | ||
568 | while (1) | |
569 | { | |
570 | /* Wait for a SYN. mips_syn_garbage is intended to prevent | |
571 | sitting here indefinitely if the board sends us one garbage | |
572 | character per second. ch may already have a value from the | |
573 | last time through the loop. */ | |
574 | while (ch != SYN) | |
575 | { | |
576 | ch = mips_readchar (timeout); | |
9a9a88c1 | 577 | if (ch == SERIAL_TIMEOUT) |
090d784a | 578 | return -1; |
33742334 ILT |
579 | if (ch != SYN) |
580 | { | |
581 | /* Printing the character here lets the user of gdb see | |
582 | what the program is outputting, if the debugging is | |
47d52968 JK |
583 | being done on the console port. Don't use _filtered; |
584 | we can't deal with a QUIT out of target_wait. */ | |
cd10c7e3 | 585 | if (! mips_initializing || remote_debug > 0) |
c2a0f1cb | 586 | { |
1f233758 SS |
587 | /* Note that the host's idea of newline may not |
588 | correspond to the target's idea, so recognize | |
589 | newline by its actual ASCII code, but write it | |
590 | out using the \n notation. */ | |
591 | if (ch < 0x20 && ch != '\012') | |
7d13174e SS |
592 | { |
593 | putchar_unfiltered ('^'); | |
594 | putchar_unfiltered (ch + 0x40); | |
595 | } | |
1f233758 SS |
596 | else if (ch == '\012') |
597 | putchar_unfiltered ('\n'); | |
7d13174e SS |
598 | else |
599 | putchar_unfiltered (ch); | |
199b2450 | 600 | gdb_flush (gdb_stdout); |
c2a0f1cb | 601 | } |
33742334 ILT |
602 | |
603 | ++*pgarbage; | |
4c5bc9f4 SG |
604 | if (mips_syn_garbage > 0 |
605 | && *pgarbage > mips_syn_garbage) | |
cd10c7e3 SG |
606 | mips_error ("Debug protocol failure: more than %d characters before a sync.", |
607 | mips_syn_garbage); | |
33742334 ILT |
608 | } |
609 | } | |
610 | ||
611 | /* Get the packet header following the SYN. */ | |
612 | for (i = 1; i < HDR_LENGTH; i++) | |
613 | { | |
614 | ch = mips_readchar (timeout); | |
9a9a88c1 | 615 | if (ch == SERIAL_TIMEOUT) |
090d784a | 616 | return -1; |
33742334 ILT |
617 | /* Make sure this is a header byte. */ |
618 | if (ch == SYN || ! HDR_CHECK (ch)) | |
619 | break; | |
620 | ||
621 | hdr[i] = ch; | |
622 | } | |
623 | ||
624 | /* If we got the complete header, we can return. Otherwise we | |
625 | loop around and keep looking for SYN. */ | |
626 | if (i >= HDR_LENGTH) | |
090d784a | 627 | return 0; |
33742334 ILT |
628 | } |
629 | } | |
630 | ||
631 | /* Get a packet header, putting the data in the supplied buffer. | |
632 | PGARBAGE is a pointer to the number of garbage characters received | |
633 | so far. The last character read is returned in *PCH. Returns 0 | |
634 | for success, -1 for timeout, -2 for error. */ | |
635 | ||
636 | static int | |
637 | mips_receive_trailer (trlr, pgarbage, pch, timeout) | |
638 | unsigned char *trlr; | |
639 | int *pgarbage; | |
640 | int *pch; | |
641 | int timeout; | |
642 | { | |
643 | int i; | |
644 | int ch; | |
645 | ||
646 | for (i = 0; i < TRLR_LENGTH; i++) | |
647 | { | |
648 | ch = mips_readchar (timeout); | |
649 | *pch = ch; | |
9a9a88c1 | 650 | if (ch == SERIAL_TIMEOUT) |
33742334 ILT |
651 | return -1; |
652 | if (! TRLR_CHECK (ch)) | |
653 | return -2; | |
654 | trlr[i] = ch; | |
655 | } | |
656 | return 0; | |
657 | } | |
658 | ||
659 | /* Get the checksum of a packet. HDR points to the packet header. | |
660 | DATA points to the packet data. LEN is the length of DATA. */ | |
661 | ||
662 | static int | |
663 | mips_cksum (hdr, data, len) | |
664 | const unsigned char *hdr; | |
665 | const unsigned char *data; | |
666 | int len; | |
667 | { | |
668 | register const unsigned char *p; | |
669 | register int c; | |
670 | register int cksum; | |
671 | ||
672 | cksum = 0; | |
673 | ||
674 | /* The initial SYN is not included in the checksum. */ | |
675 | c = HDR_LENGTH - 1; | |
676 | p = hdr + 1; | |
677 | while (c-- != 0) | |
678 | cksum += *p++; | |
679 | ||
680 | c = len; | |
681 | p = data; | |
682 | while (c-- != 0) | |
683 | cksum += *p++; | |
684 | ||
685 | return cksum; | |
686 | } | |
687 | ||
688 | /* Send a packet containing the given ASCII string. */ | |
689 | ||
690 | static void | |
c2a0f1cb | 691 | mips_send_packet (s, get_ack) |
33742334 | 692 | const char *s; |
c2a0f1cb | 693 | int get_ack; |
33742334 ILT |
694 | { |
695 | unsigned int len; | |
696 | unsigned char *packet; | |
697 | register int cksum; | |
698 | int try; | |
699 | ||
700 | len = strlen (s); | |
701 | if (len > DATA_MAXLEN) | |
4fb192be | 702 | mips_error ("MIPS protocol data packet too long: %s", s); |
33742334 ILT |
703 | |
704 | packet = (unsigned char *) alloca (HDR_LENGTH + len + TRLR_LENGTH + 1); | |
705 | ||
706 | packet[HDR_INDX_SYN] = HDR_SET_SYN (1, len, mips_send_seq); | |
707 | packet[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (1, len, mips_send_seq); | |
708 | packet[HDR_INDX_LEN1] = HDR_SET_LEN1 (1, len, mips_send_seq); | |
709 | packet[HDR_INDX_SEQ] = HDR_SET_SEQ (1, len, mips_send_seq); | |
710 | ||
711 | memcpy (packet + HDR_LENGTH, s, len); | |
712 | ||
713 | cksum = mips_cksum (packet, packet + HDR_LENGTH, len); | |
714 | packet[HDR_LENGTH + len + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum); | |
715 | packet[HDR_LENGTH + len + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum); | |
716 | packet[HDR_LENGTH + len + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum); | |
717 | ||
718 | /* Increment the sequence number. This will set mips_send_seq to | |
719 | the sequence number we expect in the acknowledgement. */ | |
720 | mips_send_seq = (mips_send_seq + 1) % SEQ_MODULOS; | |
721 | ||
722 | /* We can only have one outstanding data packet, so we just wait for | |
723 | the acknowledgement here. Keep retransmitting the packet until | |
724 | we get one, or until we've tried too many times. */ | |
725 | for (try = 0; try < mips_send_retries; try++) | |
726 | { | |
727 | int garbage; | |
728 | int ch; | |
729 | ||
cd10c7e3 | 730 | if (remote_debug > 0) |
33742334 | 731 | { |
47d52968 JK |
732 | /* Don't use _filtered; we can't deal with a QUIT out of |
733 | target_wait, and I think this might be called from there. */ | |
33742334 | 734 | packet[HDR_LENGTH + len + TRLR_LENGTH] = '\0'; |
47d52968 | 735 | printf_unfiltered ("Writing \"%s\"\n", packet + 1); |
33742334 ILT |
736 | } |
737 | ||
9a9a88c1 ILT |
738 | if (SERIAL_WRITE (mips_desc, packet, |
739 | HDR_LENGTH + len + TRLR_LENGTH) != 0) | |
4fb192be | 740 | mips_error ("write to target failed: %s", safe_strerror (errno)); |
33742334 | 741 | |
4704fd9c SG |
742 | if (! get_ack) |
743 | return; | |
744 | ||
33742334 ILT |
745 | garbage = 0; |
746 | ch = 0; | |
747 | while (1) | |
748 | { | |
749 | unsigned char hdr[HDR_LENGTH + 1]; | |
750 | unsigned char trlr[TRLR_LENGTH + 1]; | |
751 | int err; | |
752 | int seq; | |
753 | ||
754 | /* Get the packet header. If we time out, resend the data | |
755 | packet. */ | |
756 | err = mips_receive_header (hdr, &garbage, ch, mips_retransmit_wait); | |
757 | if (err != 0) | |
758 | break; | |
759 | ||
760 | ch = 0; | |
761 | ||
762 | /* If we get a data packet, assume it is a duplicate and | |
763 | ignore it. FIXME: If the acknowledgement is lost, this | |
764 | data packet may be the packet the remote sends after the | |
765 | acknowledgement. */ | |
090d784a JSC |
766 | if (HDR_IS_DATA (hdr)) { |
767 | int i; | |
768 | ||
769 | /* Ignore any errors raised whilst attempting to ignore | |
770 | packet. */ | |
771 | ||
772 | len = HDR_GET_LEN (hdr); | |
773 | ||
774 | for (i = 0; i < len; i++) | |
775 | { | |
776 | int rch; | |
777 | ||
778 | rch = mips_readchar (2); | |
779 | if (rch == SYN) | |
780 | { | |
781 | ch = SYN; | |
782 | break; | |
783 | } | |
784 | if (rch == SERIAL_TIMEOUT) | |
785 | break; | |
786 | /* ignore the character */ | |
787 | } | |
788 | ||
789 | if (i == len) | |
790 | (void) mips_receive_trailer (trlr, &garbage, &ch, 2); | |
791 | ||
792 | /* We don't bother checking the checksum, or providing an | |
793 | ACK to the packet. */ | |
33742334 | 794 | continue; |
090d784a | 795 | } |
33742334 ILT |
796 | |
797 | /* If the length is not 0, this is a garbled packet. */ | |
798 | if (HDR_GET_LEN (hdr) != 0) | |
799 | continue; | |
800 | ||
801 | /* Get the packet trailer. */ | |
802 | err = mips_receive_trailer (trlr, &garbage, &ch, | |
803 | mips_retransmit_wait); | |
804 | ||
805 | /* If we timed out, resend the data packet. */ | |
806 | if (err == -1) | |
807 | break; | |
808 | ||
809 | /* If we got a bad character, reread the header. */ | |
810 | if (err != 0) | |
811 | continue; | |
812 | ||
813 | /* If the checksum does not match the trailer checksum, this | |
814 | is a bad packet; ignore it. */ | |
815 | if (mips_cksum (hdr, (unsigned char *) NULL, 0) | |
816 | != TRLR_GET_CKSUM (trlr)) | |
817 | continue; | |
818 | ||
cd10c7e3 | 819 | if (remote_debug > 0) |
33742334 ILT |
820 | { |
821 | hdr[HDR_LENGTH] = '\0'; | |
822 | trlr[TRLR_LENGTH] = '\0'; | |
47d52968 JK |
823 | /* Don't use _filtered; we can't deal with a QUIT out of |
824 | target_wait, and I think this might be called from there. */ | |
825 | printf_unfiltered ("Got ack %d \"%s%s\"\n", | |
f63f30e2 | 826 | HDR_GET_SEQ (hdr), hdr + 1, trlr); |
33742334 ILT |
827 | } |
828 | ||
829 | /* If this ack is for the current packet, we're done. */ | |
830 | seq = HDR_GET_SEQ (hdr); | |
831 | if (seq == mips_send_seq) | |
832 | return; | |
833 | ||
834 | /* If this ack is for the last packet, resend the current | |
835 | packet. */ | |
836 | if ((seq + 1) % SEQ_MODULOS == mips_send_seq) | |
837 | break; | |
838 | ||
839 | /* Otherwise this is a bad ack; ignore it. Increment the | |
840 | garbage count to ensure that we do not stay in this loop | |
841 | forever. */ | |
842 | ++garbage; | |
843 | } | |
844 | } | |
845 | ||
4fb192be | 846 | mips_error ("Remote did not acknowledge packet"); |
33742334 ILT |
847 | } |
848 | ||
849 | /* Receive and acknowledge a packet, returning the data in BUFF (which | |
850 | should be DATA_MAXLEN + 1 bytes). The protocol documentation | |
851 | implies that only the sender retransmits packets, so this code just | |
852 | waits silently for a packet. It returns the length of the received | |
96e5f161 JK |
853 | packet. If THROW_ERROR is nonzero, call error() on errors. If not, |
854 | don't print an error message and return -1. */ | |
33742334 ILT |
855 | |
856 | static int | |
4c6071f7 | 857 | mips_receive_packet (buff, throw_error, timeout) |
33742334 | 858 | char *buff; |
96e5f161 | 859 | int throw_error; |
4c6071f7 | 860 | int timeout; |
33742334 ILT |
861 | { |
862 | int ch; | |
863 | int garbage; | |
864 | int len; | |
865 | unsigned char ack[HDR_LENGTH + TRLR_LENGTH + 1]; | |
866 | int cksum; | |
867 | ||
868 | ch = 0; | |
869 | garbage = 0; | |
870 | while (1) | |
871 | { | |
872 | unsigned char hdr[HDR_LENGTH]; | |
873 | unsigned char trlr[TRLR_LENGTH]; | |
874 | int i; | |
875 | int err; | |
876 | ||
4c6071f7 | 877 | if (mips_receive_header (hdr, &garbage, ch, timeout) != 0) |
96e5f161 JK |
878 | { |
879 | if (throw_error) | |
880 | mips_error ("Timed out waiting for remote packet"); | |
881 | else | |
882 | return -1; | |
883 | } | |
33742334 ILT |
884 | |
885 | ch = 0; | |
886 | ||
887 | /* An acknowledgement is probably a duplicate; ignore it. */ | |
888 | if (! HDR_IS_DATA (hdr)) | |
889 | { | |
090d784a JSC |
890 | len = HDR_GET_LEN (hdr); |
891 | /* Check if the length is valid for an ACK, we may aswell | |
892 | try and read the remainder of the packet: */ | |
893 | if (len == 0) | |
894 | { | |
895 | /* Ignore the error condition, since we are going to | |
896 | ignore the packet anyway. */ | |
897 | (void) mips_receive_trailer (trlr, &garbage, &ch, timeout); | |
898 | } | |
47d52968 JK |
899 | /* Don't use _filtered; we can't deal with a QUIT out of |
900 | target_wait, and I think this might be called from there. */ | |
cd10c7e3 | 901 | if (remote_debug > 0) |
47d52968 | 902 | printf_unfiltered ("Ignoring unexpected ACK\n"); |
33742334 ILT |
903 | continue; |
904 | } | |
905 | ||
33742334 | 906 | len = HDR_GET_LEN (hdr); |
33742334 ILT |
907 | for (i = 0; i < len; i++) |
908 | { | |
909 | int rch; | |
910 | ||
4c6071f7 | 911 | rch = mips_readchar (timeout); |
33742334 ILT |
912 | if (rch == SYN) |
913 | { | |
914 | ch = SYN; | |
915 | break; | |
916 | } | |
9a9a88c1 | 917 | if (rch == SERIAL_TIMEOUT) |
96e5f161 JK |
918 | { |
919 | if (throw_error) | |
920 | mips_error ("Timed out waiting for remote packet"); | |
921 | else | |
922 | return -1; | |
923 | } | |
33742334 ILT |
924 | buff[i] = rch; |
925 | } | |
926 | ||
927 | if (i < len) | |
928 | { | |
47d52968 JK |
929 | /* Don't use _filtered; we can't deal with a QUIT out of |
930 | target_wait, and I think this might be called from there. */ | |
cd10c7e3 | 931 | if (remote_debug > 0) |
47d52968 | 932 | printf_unfiltered ("Got new SYN after %d chars (wanted %d)\n", |
33742334 ILT |
933 | i, len); |
934 | continue; | |
935 | } | |
936 | ||
4c6071f7 | 937 | err = mips_receive_trailer (trlr, &garbage, &ch, timeout); |
33742334 | 938 | if (err == -1) |
96e5f161 JK |
939 | { |
940 | if (throw_error) | |
941 | mips_error ("Timed out waiting for packet"); | |
942 | else | |
943 | return -1; | |
944 | } | |
33742334 ILT |
945 | if (err == -2) |
946 | { | |
47d52968 JK |
947 | /* Don't use _filtered; we can't deal with a QUIT out of |
948 | target_wait, and I think this might be called from there. */ | |
cd10c7e3 | 949 | if (remote_debug > 0) |
47d52968 | 950 | printf_unfiltered ("Got SYN when wanted trailer\n"); |
33742334 ILT |
951 | continue; |
952 | } | |
953 | ||
090d784a JSC |
954 | /* If this is the wrong sequence number, ignore it. */ |
955 | if (HDR_GET_SEQ (hdr) != mips_receive_seq) | |
956 | { | |
957 | /* Don't use _filtered; we can't deal with a QUIT out of | |
958 | target_wait, and I think this might be called from there. */ | |
959 | if (remote_debug > 0) | |
960 | printf_unfiltered ("Ignoring sequence number %d (want %d)\n", | |
961 | HDR_GET_SEQ (hdr), mips_receive_seq); | |
962 | continue; | |
963 | } | |
964 | ||
33742334 | 965 | if (mips_cksum (hdr, buff, len) == TRLR_GET_CKSUM (trlr)) |
090d784a | 966 | break; |
33742334 | 967 | |
cd10c7e3 | 968 | if (remote_debug > 0) |
47d52968 JK |
969 | /* Don't use _filtered; we can't deal with a QUIT out of |
970 | target_wait, and I think this might be called from there. */ | |
971 | printf_unfiltered ("Bad checksum; data %d, trailer %d\n", | |
33742334 ILT |
972 | mips_cksum (hdr, buff, len), |
973 | TRLR_GET_CKSUM (trlr)); | |
974 | ||
975 | /* The checksum failed. Send an acknowledgement for the | |
976 | previous packet to tell the remote to resend the packet. */ | |
977 | ack[HDR_INDX_SYN] = HDR_SET_SYN (0, 0, mips_receive_seq); | |
978 | ack[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq); | |
979 | ack[HDR_INDX_LEN1] = HDR_SET_LEN1 (0, 0, mips_receive_seq); | |
980 | ack[HDR_INDX_SEQ] = HDR_SET_SEQ (0, 0, mips_receive_seq); | |
981 | ||
982 | cksum = mips_cksum (ack, (unsigned char *) NULL, 0); | |
983 | ||
984 | ack[HDR_LENGTH + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum); | |
985 | ack[HDR_LENGTH + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum); | |
986 | ack[HDR_LENGTH + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum); | |
987 | ||
cd10c7e3 | 988 | if (remote_debug > 0) |
33742334 ILT |
989 | { |
990 | ack[HDR_LENGTH + TRLR_LENGTH] = '\0'; | |
47d52968 JK |
991 | /* Don't use _filtered; we can't deal with a QUIT out of |
992 | target_wait, and I think this might be called from there. */ | |
993 | printf_unfiltered ("Writing ack %d \"%s\"\n", mips_receive_seq, | |
33742334 ILT |
994 | ack + 1); |
995 | } | |
996 | ||
9a9a88c1 | 997 | if (SERIAL_WRITE (mips_desc, ack, HDR_LENGTH + TRLR_LENGTH) != 0) |
96e5f161 JK |
998 | { |
999 | if (throw_error) | |
1000 | mips_error ("write to target failed: %s", safe_strerror (errno)); | |
1001 | else | |
1002 | return -1; | |
1003 | } | |
33742334 ILT |
1004 | } |
1005 | ||
cd10c7e3 | 1006 | if (remote_debug > 0) |
33742334 ILT |
1007 | { |
1008 | buff[len] = '\0'; | |
47d52968 JK |
1009 | /* Don't use _filtered; we can't deal with a QUIT out of |
1010 | target_wait, and I think this might be called from there. */ | |
1011 | printf_unfiltered ("Got packet \"%s\"\n", buff); | |
33742334 ILT |
1012 | } |
1013 | ||
1014 | /* We got the packet. Send an acknowledgement. */ | |
1015 | mips_receive_seq = (mips_receive_seq + 1) % SEQ_MODULOS; | |
1016 | ||
1017 | ack[HDR_INDX_SYN] = HDR_SET_SYN (0, 0, mips_receive_seq); | |
1018 | ack[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq); | |
1019 | ack[HDR_INDX_LEN1] = HDR_SET_LEN1 (0, 0, mips_receive_seq); | |
1020 | ack[HDR_INDX_SEQ] = HDR_SET_SEQ (0, 0, mips_receive_seq); | |
1021 | ||
1022 | cksum = mips_cksum (ack, (unsigned char *) NULL, 0); | |
1023 | ||
1024 | ack[HDR_LENGTH + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum); | |
1025 | ack[HDR_LENGTH + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum); | |
1026 | ack[HDR_LENGTH + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum); | |
1027 | ||
cd10c7e3 | 1028 | if (remote_debug > 0) |
33742334 ILT |
1029 | { |
1030 | ack[HDR_LENGTH + TRLR_LENGTH] = '\0'; | |
47d52968 JK |
1031 | /* Don't use _filtered; we can't deal with a QUIT out of |
1032 | target_wait, and I think this might be called from there. */ | |
1033 | printf_unfiltered ("Writing ack %d \"%s\"\n", mips_receive_seq, | |
33742334 ILT |
1034 | ack + 1); |
1035 | } | |
1036 | ||
9a9a88c1 | 1037 | if (SERIAL_WRITE (mips_desc, ack, HDR_LENGTH + TRLR_LENGTH) != 0) |
96e5f161 JK |
1038 | { |
1039 | if (throw_error) | |
1040 | mips_error ("write to target failed: %s", safe_strerror (errno)); | |
1041 | else | |
1042 | return -1; | |
1043 | } | |
33742334 ILT |
1044 | |
1045 | return len; | |
1046 | } | |
1047 | \f | |
1048 | /* Optionally send a request to the remote system and optionally wait | |
1049 | for the reply. This implements the remote debugging protocol, | |
1050 | which is built on top of the packet protocol defined above. Each | |
1051 | request has an ADDR argument and a DATA argument. The following | |
1052 | requests are defined: | |
1053 | ||
1054 | \0 don't send a request; just wait for a reply | |
1055 | i read word from instruction space at ADDR | |
1056 | d read word from data space at ADDR | |
1057 | I write DATA to instruction space at ADDR | |
1058 | D write DATA to data space at ADDR | |
1059 | r read register number ADDR | |
1060 | R set register number ADDR to value DATA | |
1061 | c continue execution (if ADDR != 1, set pc to ADDR) | |
1062 | s single step (if ADDR != 1, set pc to ADDR) | |
1063 | ||
1064 | The read requests return the value requested. The write requests | |
1065 | return the previous value in the changed location. The execution | |
1066 | requests return a UNIX wait value (the approximate signal which | |
1067 | caused execution to stop is in the upper eight bits). | |
1068 | ||
1069 | If PERR is not NULL, this function waits for a reply. If an error | |
1070 | occurs, it sets *PERR to 1 and sets errno according to what the | |
1071 | target board reports. */ | |
1072 | ||
1073 | static int | |
cd10c7e3 SG |
1074 | mips_request (cmd, addr, data, perr, timeout, buff) |
1075 | int cmd; | |
33742334 ILT |
1076 | unsigned int addr; |
1077 | unsigned int data; | |
1078 | int *perr; | |
4c6071f7 | 1079 | int timeout; |
cd10c7e3 | 1080 | char *buff; |
33742334 | 1081 | { |
cd10c7e3 | 1082 | char myBuff[DATA_MAXLEN + 1]; |
33742334 ILT |
1083 | int len; |
1084 | int rpid; | |
1085 | char rcmd; | |
1086 | int rerrflg; | |
1087 | int rresponse; | |
4887063b | 1088 | |
cd10c7e3 SG |
1089 | if (buff == (char *) NULL) |
1090 | buff = myBuff; | |
1091 | ||
33742334 ILT |
1092 | if (cmd != '\0') |
1093 | { | |
1094 | if (mips_need_reply) | |
1095 | fatal ("mips_request: Trying to send command before reply"); | |
1096 | sprintf (buff, "0x0 %c 0x%x 0x%x", cmd, addr, data); | |
c2a0f1cb | 1097 | mips_send_packet (buff, 1); |
33742334 ILT |
1098 | mips_need_reply = 1; |
1099 | } | |
1100 | ||
1101 | if (perr == (int *) NULL) | |
1102 | return 0; | |
1103 | ||
1104 | if (! mips_need_reply) | |
1105 | fatal ("mips_request: Trying to get reply before command"); | |
1106 | ||
1107 | mips_need_reply = 0; | |
1108 | ||
4c6071f7 | 1109 | len = mips_receive_packet (buff, 1, timeout); |
33742334 ILT |
1110 | buff[len] = '\0'; |
1111 | ||
1112 | if (sscanf (buff, "0x%x %c 0x%x 0x%x", | |
1113 | &rpid, &rcmd, &rerrflg, &rresponse) != 4 | |
33742334 | 1114 | || (cmd != '\0' && rcmd != cmd)) |
4fb192be | 1115 | mips_error ("Bad response from remote board"); |
33742334 ILT |
1116 | |
1117 | if (rerrflg != 0) | |
1118 | { | |
1119 | *perr = 1; | |
1120 | ||
1121 | /* FIXME: This will returns MIPS errno numbers, which may or may | |
1122 | not be the same as errno values used on other systems. If | |
1123 | they stick to common errno values, they will be the same, but | |
1124 | if they don't, they must be translated. */ | |
1125 | errno = rresponse; | |
1126 | ||
1127 | return 0; | |
1128 | } | |
1129 | ||
1130 | *perr = 0; | |
1131 | return rresponse; | |
1132 | } | |
1133 | ||
864df7e6 JK |
1134 | static void |
1135 | mips_initialize_cleanups (arg) | |
1136 | PTR arg; | |
1137 | { | |
1138 | mips_initializing = 0; | |
1139 | } | |
1140 | ||
090d784a JSC |
1141 | static void |
1142 | mips_send_command (cmd, prompt) | |
1143 | const char *cmd; | |
1144 | int prompt; | |
1145 | { | |
1146 | SERIAL_WRITE (mips_desc, cmd, strlen(cmd)); | |
1147 | mips_expect (cmd); | |
1148 | mips_expect ("\012"); | |
1149 | if (prompt) | |
1150 | mips_expect (mips_monitor_prompt); | |
1151 | } | |
1152 | ||
1153 | /* Enter remote (dbx) debug mode: */ | |
1154 | static void | |
1155 | mips_enter_debug () | |
1156 | { | |
1157 | /* Reset the sequence numbers, ready for the new debug sequence: */ | |
1158 | mips_send_seq = 0; | |
1159 | mips_receive_seq = 0; | |
1160 | ||
5dad8312 | 1161 | if (mips_monitor == MON_PMON || mips_monitor == MON_DDB) |
090d784a JSC |
1162 | mips_send_command ("debug\015", 0); |
1163 | else /* assume IDT monitor by default */ | |
1164 | mips_send_command ("db tty0\015", 0); | |
1165 | ||
1166 | SERIAL_WRITE (mips_desc, "\015", sizeof "\015" - 1); | |
1167 | ||
1168 | /* We don't need to absorb any spurious characters here, since the | |
1169 | mips_receive_header will eat up a reasonable number of characters | |
1170 | whilst looking for the SYN, however this avoids the "garbage" | |
1171 | being displayed to the user. */ | |
5dad8312 | 1172 | if (mips_monitor == MON_PMON || mips_monitor == MON_DDB) |
090d784a JSC |
1173 | mips_expect ("\015"); |
1174 | ||
1175 | { | |
1176 | char buff[DATA_MAXLEN + 1]; | |
1177 | if (mips_receive_packet (buff, 1, 3) < 0) | |
1178 | mips_error ("Failed to initialize (didn't receive packet)."); | |
1179 | } | |
1180 | } | |
1181 | ||
1182 | /* Exit remote (dbx) debug mode, returning to the monitor prompt: */ | |
1183 | static int | |
1184 | mips_exit_debug () | |
1185 | { | |
1186 | int err; | |
1187 | ||
5dad8312 | 1188 | if (mips_monitor == MON_DDB) |
51328506 | 1189 | { |
5dad8312 | 1190 | /* The Ddb version of PMON exits immediately, so we do not get |
51328506 JSC |
1191 | a reply to this command: */ |
1192 | mips_request ('x', (unsigned int) 0, (unsigned int) 0, NULL, | |
090d784a | 1193 | mips_receive_wait, NULL); |
51328506 JSC |
1194 | mips_need_reply = 0; |
1195 | if (!mips_expect (" break!")) | |
1196 | return -1; | |
1197 | } | |
1198 | else | |
1199 | mips_request ('x', (unsigned int) 0, (unsigned int) 0, &err, | |
1200 | mips_receive_wait, NULL); | |
090d784a JSC |
1201 | |
1202 | if (mips_monitor == MON_PMON && !mips_expect ("Exiting remote debug mode")) | |
1203 | return -1; | |
1204 | ||
5dad8312 | 1205 | if (mips_monitor == MON_DDB) |
51328506 JSC |
1206 | { |
1207 | if (!mips_expect ("\012")) | |
1208 | return -1; | |
1209 | } | |
1210 | else | |
1211 | if (!mips_expect ("\015\012")) | |
1212 | return -1; | |
090d784a JSC |
1213 | |
1214 | if (!mips_expect (mips_monitor_prompt)) | |
1215 | return -1; | |
1216 | ||
1217 | return 0; | |
1218 | } | |
1219 | ||
c2a0f1cb ILT |
1220 | /* Initialize a new connection to the MIPS board, and make sure we are |
1221 | really connected. */ | |
1222 | ||
1223 | static void | |
1224 | mips_initialize () | |
1225 | { | |
c2a0f1cb | 1226 | int err; |
864df7e6 | 1227 | struct cleanup *old_cleanups = make_cleanup (mips_initialize_cleanups, NULL); |
188c635f | 1228 | int j; |
c2a0f1cb | 1229 | |
864df7e6 JK |
1230 | /* What is this code doing here? I don't see any way it can happen, and |
1231 | it might mean mips_initializing didn't get cleared properly. | |
1232 | So I'll make it a warning. */ | |
188c635f | 1233 | |
c2a0f1cb | 1234 | if (mips_initializing) |
864df7e6 JK |
1235 | { |
1236 | warning ("internal error: mips_initialize called twice"); | |
1237 | return; | |
1238 | } | |
c2a0f1cb | 1239 | |
cd10c7e3 | 1240 | mips_wait_flag = 0; |
c2a0f1cb ILT |
1241 | mips_initializing = 1; |
1242 | ||
188c635f SG |
1243 | /* At this point, the packit protocol isn't responding. We'll try getting |
1244 | into the monitor, and restarting the protocol. */ | |
4704fd9c | 1245 | |
090d784a JSC |
1246 | /* Force the system into the monitor. After this we *should* be at |
1247 | the mips_monitor_prompt. */ | |
5dad8312 | 1248 | if (mips_monitor == MON_PMON || mips_monitor == MON_DDB) |
090d784a JSC |
1249 | j = 0; /* start by checking if we are already at the prompt */ |
1250 | else | |
1251 | j = 1; /* start by sending a break */ | |
1252 | for (; j <= 4; j++) | |
188c635f SG |
1253 | { |
1254 | switch (j) | |
4704fd9c | 1255 | { |
090d784a JSC |
1256 | case 0: /* First, try sending a CR */ |
1257 | SERIAL_FLUSH_INPUT (mips_desc); | |
1258 | SERIAL_WRITE (mips_desc, "\015", 1); | |
1259 | break; | |
188c635f SG |
1260 | case 1: /* First, try sending a break */ |
1261 | SERIAL_SEND_BREAK (mips_desc); | |
1262 | break; | |
1263 | case 2: /* Then, try a ^C */ | |
1264 | SERIAL_WRITE (mips_desc, "\003", 1); | |
1265 | break; | |
1266 | case 3: /* Then, try escaping from download */ | |
1267 | { | |
5dad8312 | 1268 | if (mips_monitor == MON_PMON || mips_monitor == MON_DDB) |
090d784a JSC |
1269 | { |
1270 | char tbuff[7]; | |
1271 | ||
1272 | /* We shouldn't need to send multiple termination | |
1273 | sequences, since the target performs line (or | |
1274 | block) reads, and then processes those | |
1275 | packets. In-case we were downloading a large packet | |
1276 | we flush the output buffer before inserting a | |
1277 | termination sequence. */ | |
1278 | SERIAL_FLUSH_OUTPUT (mips_desc); | |
1279 | sprintf (tbuff, "\015/E/E\015"); | |
1280 | SERIAL_WRITE (mips_desc, tbuff, 6); | |
1281 | } | |
1282 | else | |
1283 | { | |
1284 | char srec[10]; | |
1285 | int i; | |
1286 | ||
1287 | /* We are possibly in binary download mode, having | |
1288 | aborted in the middle of an S-record. ^C won't | |
1289 | work because of binary mode. The only reliable way | |
1290 | out is to send enough termination packets (8 bytes) | |
1291 | to fill up and then overflow the largest size | |
1292 | S-record (255 bytes in this case). This amounts to | |
1293 | 256/8 + 1 packets. | |
1294 | */ | |
1295 | ||
1296 | mips_make_srec (srec, '7', 0, NULL, 0); | |
1297 | ||
1298 | for (i = 1; i <= 33; i++) | |
1299 | { | |
1300 | SERIAL_WRITE (mips_desc, srec, 8); | |
1301 | ||
1302 | if (SERIAL_READCHAR (mips_desc, 0) >= 0) | |
1303 | break; /* Break immediatly if we get something from | |
4704fd9c | 1304 | the board. */ |
090d784a JSC |
1305 | } |
1306 | } | |
1307 | } | |
afb69487 | 1308 | break; |
8b07d12c | 1309 | case 4: |
afb69487 | 1310 | mips_error ("Failed to initialize."); |
4704fd9c SG |
1311 | } |
1312 | ||
090d784a | 1313 | if (mips_expect (mips_monitor_prompt)) |
afb69487 | 1314 | break; |
c2a0f1cb | 1315 | } |
afb69487 | 1316 | |
5dad8312 | 1317 | if (mips_monitor == MON_PMON || mips_monitor == MON_DDB) |
090d784a JSC |
1318 | { |
1319 | /* Ensure the correct target state: */ | |
1320 | mips_send_command ("set regsize 64\015", -1); | |
1321 | mips_send_command ("set hostport tty0\015", -1); | |
1322 | mips_send_command ("set brkcmd \"\"\015", -1); | |
1323 | /* Delete all the current breakpoints: */ | |
1324 | mips_send_command ("db *\015", -1); | |
1325 | /* NOTE: PMON does not have breakpoint support through the | |
1326 | "debug" mode, only at the monitor command-line. */ | |
1327 | } | |
afb69487 | 1328 | |
090d784a | 1329 | mips_enter_debug (); |
c2a0f1cb | 1330 | |
090d784a JSC |
1331 | /* Clear all breakpoints: */ |
1332 | if (common_breakpoint ('b', -1, 0, NULL)) | |
1333 | monitor_supports_breakpoints = 0; | |
cd10c7e3 | 1334 | else |
090d784a | 1335 | monitor_supports_breakpoints = 1; |
cd10c7e3 | 1336 | |
864df7e6 | 1337 | do_cleanups (old_cleanups); |
c2a0f1cb ILT |
1338 | |
1339 | /* If this doesn't call error, we have connected; we don't care if | |
1340 | the request itself succeeds or fails. */ | |
188c635f | 1341 | |
4c6071f7 | 1342 | mips_request ('r', (unsigned int) 0, (unsigned int) 0, &err, |
cd10c7e3 SG |
1343 | mips_receive_wait, NULL); |
1344 | set_current_frame (create_new_frame (read_fp (), read_pc ())); | |
1345 | select_frame (get_current_frame (), 0); | |
c2a0f1cb ILT |
1346 | } |
1347 | ||
33742334 | 1348 | /* Open a connection to the remote board. */ |
33742334 | 1349 | static void |
090d784a JSC |
1350 | common_open (ops, name, from_tty) |
1351 | struct target_ops *ops; | |
33742334 ILT |
1352 | char *name; |
1353 | int from_tty; | |
1354 | { | |
ae55bdbc SS |
1355 | char *ptype; |
1356 | ||
33742334 ILT |
1357 | if (name == 0) |
1358 | error ( | |
1359 | "To open a MIPS remote debugging connection, you need to specify what serial\n\ | |
1360 | device is attached to the target board (e.g., /dev/ttya)."); | |
1361 | ||
1362 | target_preopen (from_tty); | |
1363 | ||
1364 | if (mips_is_open) | |
090d784a | 1365 | unpush_target (current_ops); |
33742334 | 1366 | |
1724c671 | 1367 | mips_desc = SERIAL_OPEN (name); |
9a9a88c1 | 1368 | if (mips_desc == (serial_t) NULL) |
33742334 ILT |
1369 | perror_with_name (name); |
1370 | ||
d48d9a28 KH |
1371 | if (baud_rate != -1) |
1372 | { | |
1373 | if (SERIAL_SETBAUDRATE (mips_desc, baud_rate)) | |
1374 | { | |
1375 | SERIAL_CLOSE (mips_desc); | |
1376 | perror_with_name (name); | |
1377 | } | |
1378 | } | |
1379 | ||
1724c671 SG |
1380 | SERIAL_RAW (mips_desc); |
1381 | ||
090d784a | 1382 | current_ops = ops; |
33742334 ILT |
1383 | mips_is_open = 1; |
1384 | ||
c2a0f1cb | 1385 | mips_initialize (); |
33742334 ILT |
1386 | |
1387 | if (from_tty) | |
199b2450 | 1388 | printf_unfiltered ("Remote MIPS debugging using %s\n", name); |
ae55bdbc SS |
1389 | |
1390 | /* Switch to using remote target now. */ | |
090d784a | 1391 | push_target (ops); |
33742334 | 1392 | |
c2a0f1cb | 1393 | /* FIXME: Should we call start_remote here? */ |
ae55bdbc SS |
1394 | |
1395 | /* Try to figure out the processor model if possible. */ | |
1396 | ptype = mips_read_processor_type (); | |
1397 | if (ptype) | |
1398 | mips_set_processor_type_command (strsave (ptype), 0); | |
4887063b SG |
1399 | |
1400 | /* This is really the job of start_remote however, that makes an assumption | |
1401 | that the target is about to print out a status message of some sort. That | |
1402 | doesn't happen here (in fact, it may not be possible to get the monitor to | |
1403 | send the appropriate packet). */ | |
1404 | ||
1405 | flush_cached_frames (); | |
1406 | registers_changed (); | |
1407 | stop_pc = read_pc (); | |
1408 | set_current_frame (create_new_frame (read_fp (), stop_pc)); | |
1409 | select_frame (get_current_frame (), 0); | |
1410 | print_stack_frame (selected_frame, -1, 1); | |
33742334 ILT |
1411 | } |
1412 | ||
090d784a JSC |
1413 | static void |
1414 | mips_open (name, from_tty) | |
1415 | char *name; | |
1416 | int from_tty; | |
1417 | { | |
1418 | mips_monitor = MON_IDT; | |
1419 | common_open (&mips_ops, name, from_tty); | |
1420 | } | |
1421 | ||
1422 | static void | |
1423 | pmon_open (name, from_tty) | |
1424 | char *name; | |
1425 | int from_tty; | |
1426 | { | |
1427 | /* The PMON monitor has a prompt different from the default | |
1428 | "TARGET_MONITOR_PROMPT": */ | |
1429 | mips_monitor_prompt = "PMON> "; | |
1430 | mips_monitor = MON_PMON; | |
1431 | common_open (&pmon_ops, name, from_tty); | |
1432 | } | |
1433 | ||
51328506 | 1434 | static void |
5dad8312 | 1435 | ddb_open (name, from_tty) |
51328506 JSC |
1436 | char *name; |
1437 | int from_tty; | |
1438 | { | |
1439 | /* The PMON monitor has a prompt different from the default | |
1440 | "TARGET_MONITOR_PROMPT": */ | |
1441 | mips_monitor_prompt = "NEC010>"; | |
5dad8312 SS |
1442 | mips_monitor = MON_DDB; |
1443 | common_open (&ddb_ops, name, from_tty); | |
51328506 | 1444 | } |
090d784a | 1445 | |
33742334 ILT |
1446 | /* Close a connection to the remote board. */ |
1447 | ||
1448 | static void | |
1449 | mips_close (quitting) | |
1450 | int quitting; | |
1451 | { | |
1452 | if (mips_is_open) | |
1453 | { | |
c2a0f1cb ILT |
1454 | int err; |
1455 | ||
1456 | mips_is_open = 0; | |
1457 | ||
33742334 | 1458 | /* Get the board out of remote debugging mode. */ |
090d784a | 1459 | (void) mips_exit_debug (); |
c2a0f1cb | 1460 | |
1724c671 | 1461 | SERIAL_CLOSE (mips_desc); |
33742334 ILT |
1462 | } |
1463 | } | |
1464 | ||
1465 | /* Detach from the remote board. */ | |
1466 | ||
1467 | static void | |
1468 | mips_detach (args, from_tty) | |
1469 | char *args; | |
1470 | int from_tty; | |
1471 | { | |
1472 | if (args) | |
1473 | error ("Argument given to \"detach\" when remotely debugging."); | |
1474 | ||
1475 | pop_target (); | |
cd10c7e3 SG |
1476 | |
1477 | mips_close (1); | |
1478 | ||
33742334 | 1479 | if (from_tty) |
199b2450 | 1480 | printf_unfiltered ("Ending remote MIPS debugging.\n"); |
33742334 ILT |
1481 | } |
1482 | ||
1483 | /* Tell the target board to resume. This does not wait for a reply | |
1484 | from the board. */ | |
1485 | ||
1486 | static void | |
25286543 | 1487 | mips_resume (pid, step, siggnal) |
67ac9759 JK |
1488 | int pid, step; |
1489 | enum target_signal siggnal; | |
33742334 | 1490 | { |
cd10c7e3 SG |
1491 | |
1492 | /* start-sanitize-gm */ | |
188c635f | 1493 | #ifndef GENERAL_MAGIC |
67ac9759 JK |
1494 | if (siggnal != TARGET_SIGNAL_0) |
1495 | warning | |
1496 | ("Can't send signals to a remote system. Try `handle %s ignore'.", | |
1497 | target_signal_to_name (siggnal)); | |
188c635f | 1498 | #endif /* GENERAL_MAGIC */ |
cd10c7e3 | 1499 | /* end-sanitize-gm */ |
33742334 ILT |
1500 | |
1501 | mips_request (step ? 's' : 'c', | |
c2a0f1cb | 1502 | (unsigned int) 1, |
cd10c7e3 | 1503 | (unsigned int) siggnal, |
4c6071f7 | 1504 | (int *) NULL, |
cd10c7e3 | 1505 | mips_receive_wait, NULL); |
33742334 ILT |
1506 | } |
1507 | ||
f3fe8934 JK |
1508 | /* Return the signal corresponding to SIG, where SIG is the number which |
1509 | the MIPS protocol uses for the signal. */ | |
1510 | enum target_signal | |
1511 | mips_signal_from_protocol (sig) | |
1512 | int sig; | |
1513 | { | |
1514 | /* We allow a few more signals than the IDT board actually returns, on | |
1515 | the theory that there is at least *some* hope that perhaps the numbering | |
1516 | for these signals is widely agreed upon. */ | |
1517 | if (sig <= 0 | |
1518 | || sig > 31) | |
1519 | return TARGET_SIGNAL_UNKNOWN; | |
1520 | ||
1521 | /* Don't want to use target_signal_from_host because we are converting | |
1522 | from MIPS signal numbers, not host ones. Our internal numbers | |
1523 | match the MIPS numbers for the signals the board can return, which | |
1524 | are: SIGINT, SIGSEGV, SIGBUS, SIGILL, SIGFPE, SIGTRAP. */ | |
1525 | return (enum target_signal) sig; | |
1526 | } | |
1527 | ||
33742334 ILT |
1528 | /* Wait until the remote stops, and return a wait status. */ |
1529 | ||
1530 | static int | |
f7fa951f DZ |
1531 | mips_wait (pid, status) |
1532 | int pid; | |
67ac9759 | 1533 | struct target_waitstatus *status; |
33742334 ILT |
1534 | { |
1535 | int rstatus; | |
1536 | int err; | |
cd10c7e3 SG |
1537 | char buff[DATA_MAXLEN]; |
1538 | int rpc, rfp, rsp; | |
1539 | char flags[20]; | |
1540 | int nfields; | |
1541 | ||
1542 | interrupt_count = 0; | |
1543 | hit_watchpoint = 0; | |
33742334 ILT |
1544 | |
1545 | /* If we have not sent a single step or continue command, then the | |
1546 | board is waiting for us to do something. Return a status | |
1547 | indicating that it is stopped. */ | |
1548 | if (! mips_need_reply) | |
1549 | { | |
67ac9759 JK |
1550 | status->kind = TARGET_WAITKIND_STOPPED; |
1551 | status->value.sig = TARGET_SIGNAL_TRAP; | |
33742334 ILT |
1552 | return 0; |
1553 | } | |
1554 | ||
4c6071f7 | 1555 | /* No timeout; we sit here as long as the program continues to execute. */ |
cd10c7e3 SG |
1556 | mips_wait_flag = 1; |
1557 | rstatus = mips_request ('\000', (unsigned int) 0, (unsigned int) 0, &err, -1, | |
1558 | buff); | |
1559 | mips_wait_flag = 0; | |
33742334 | 1560 | if (err) |
4fb192be | 1561 | mips_error ("Remote failure: %s", safe_strerror (errno)); |
33742334 | 1562 | |
cd10c7e3 SG |
1563 | nfields = sscanf (buff, "0x%*x %*c 0x%*x 0x%*x 0x%x 0x%x 0x%x 0x%*x %s", |
1564 | &rpc, &rfp, &rsp, flags); | |
1565 | ||
1566 | /* See if we got back extended status. If so, pick out the pc, fp, sp, etc... */ | |
1567 | ||
1568 | if (nfields == 7 || nfields == 9) | |
1569 | { | |
1570 | char buf[MAX_REGISTER_RAW_SIZE]; | |
1571 | ||
1572 | store_unsigned_integer (buf, REGISTER_RAW_SIZE (PC_REGNUM), rpc); | |
1573 | supply_register (PC_REGNUM, buf); | |
1574 | ||
1575 | store_unsigned_integer (buf, REGISTER_RAW_SIZE (PC_REGNUM), rfp); | |
1576 | supply_register (30, buf); /* This register they are avoiding and so it is unnamed */ | |
1577 | ||
1578 | store_unsigned_integer (buf, REGISTER_RAW_SIZE (SP_REGNUM), rsp); | |
1579 | supply_register (SP_REGNUM, buf); | |
1580 | ||
1581 | store_unsigned_integer (buf, REGISTER_RAW_SIZE (FP_REGNUM), 0); | |
1582 | supply_register (FP_REGNUM, buf); | |
1583 | ||
1584 | if (nfields == 9) | |
1585 | { | |
1586 | int i; | |
1587 | ||
1588 | for (i = 0; i <= 2; i++) | |
1589 | if (flags[i] == 'r' || flags[i] == 'w') | |
1590 | hit_watchpoint = 1; | |
1591 | else if (flags[i] == '\000') | |
1592 | break; | |
1593 | } | |
1594 | } | |
1595 | ||
67ac9759 JK |
1596 | /* Translate a MIPS waitstatus. We use constants here rather than WTERMSIG |
1597 | and so on, because the constants we want here are determined by the | |
1598 | MIPS protocol and have nothing to do with what host we are running on. */ | |
6397809b | 1599 | if ((rstatus & 0377) == 0) |
67ac9759 JK |
1600 | { |
1601 | status->kind = TARGET_WAITKIND_EXITED; | |
1602 | status->value.integer = (((rstatus) >> 8) & 0377); | |
1603 | } | |
6397809b | 1604 | else if ((rstatus & 0377) == 0177) |
67ac9759 | 1605 | { |
5efb3899 | 1606 | status->kind = TARGET_WAITKIND_STOPPED; |
f3fe8934 | 1607 | status->value.sig = mips_signal_from_protocol (((rstatus) >> 8) & 0377); |
67ac9759 JK |
1608 | } |
1609 | else | |
1610 | { | |
1611 | status->kind = TARGET_WAITKIND_SIGNALLED; | |
f3fe8934 | 1612 | status->value.sig = mips_signal_from_protocol (rstatus & 0177); |
67ac9759 | 1613 | } |
33742334 ILT |
1614 | |
1615 | return 0; | |
1616 | } | |
1617 | ||
090d784a JSC |
1618 | static int |
1619 | pmon_wait (pid, status) | |
1620 | int pid; | |
1621 | struct target_waitstatus *status; | |
1622 | { | |
1623 | int rstatus; | |
1624 | int err; | |
1625 | char buff[DATA_MAXLEN]; | |
1626 | ||
1627 | interrupt_count = 0; | |
1628 | hit_watchpoint = 0; | |
1629 | ||
1630 | /* If we have not sent a single step or continue command, then the | |
1631 | board is waiting for us to do something. Return a status | |
1632 | indicating that it is stopped. */ | |
1633 | if (! mips_need_reply) | |
1634 | { | |
1635 | status->kind = TARGET_WAITKIND_STOPPED; | |
1636 | status->value.sig = TARGET_SIGNAL_TRAP; | |
1637 | return 0; | |
1638 | } | |
1639 | ||
1640 | /* Sit, polling the serial until the target decides to talk to | |
1641 | us. NOTE: the timeout value we use is used not just for the | |
1642 | first character, but for all the characters. */ | |
1643 | mips_wait_flag = 1; | |
1644 | rstatus = mips_request ('\000', (unsigned int) 0, (unsigned int) 0, &err, -1, | |
1645 | buff); | |
1646 | mips_wait_flag = 0; | |
1647 | if (err) | |
1648 | mips_error ("Remote failure: %s", safe_strerror (errno)); | |
1649 | ||
1650 | /* NOTE: The following (sig) numbers are defined by PMON: | |
1651 | SPP_SIGTRAP 5 breakpoint | |
1652 | SPP_SIGINT 2 | |
1653 | SPP_SIGSEGV 11 | |
1654 | SPP_SIGBUS 10 | |
1655 | SPP_SIGILL 4 | |
1656 | SPP_SIGFPE 8 | |
1657 | SPP_SIGTERM 15 */ | |
1658 | ||
1659 | /* On returning from a continue, the PMON monitor seems to start | |
1660 | echoing back the messages we send prior to sending back the | |
1661 | ACK. The code can cope with this, but to try and avoid the | |
1662 | unnecessary serial traffic, and "spurious" characters displayed | |
1663 | to the user, we cheat and reset the debug protocol. The problems | |
1664 | seems to be caused by a check on the number of arguments, and the | |
1665 | command length, within the monitor causing it to echo the command | |
1666 | as a bad packet. */ | |
5dad8312 | 1667 | if (mips_monitor != MON_DDB) |
1db0c2f7 JSC |
1668 | { |
1669 | mips_exit_debug (); | |
1670 | mips_enter_debug (); | |
1671 | } | |
090d784a JSC |
1672 | |
1673 | /* Translate a MIPS waitstatus. We use constants here rather than WTERMSIG | |
1674 | and so on, because the constants we want here are determined by the | |
1675 | MIPS protocol and have nothing to do with what host we are running on. */ | |
1676 | if ((rstatus & 0377) == 0) | |
1677 | { | |
1678 | status->kind = TARGET_WAITKIND_EXITED; | |
1679 | status->value.integer = (((rstatus) >> 8) & 0377); | |
1680 | } | |
1681 | else if ((rstatus & 0377) == 0177) | |
1682 | { | |
1683 | status->kind = TARGET_WAITKIND_STOPPED; | |
1684 | status->value.sig = mips_signal_from_protocol (((rstatus) >> 8) & 0377); | |
1685 | } | |
1686 | else | |
1687 | { | |
1688 | status->kind = TARGET_WAITKIND_SIGNALLED; | |
1689 | status->value.sig = mips_signal_from_protocol (rstatus & 0177); | |
1690 | } | |
1691 | ||
1692 | return 0; | |
1693 | } | |
1694 | ||
33742334 ILT |
1695 | /* We have to map between the register numbers used by gdb and the |
1696 | register numbers used by the debugging protocol. This function | |
1697 | assumes that we are using tm-mips.h. */ | |
1698 | ||
1699 | #define REGNO_OFFSET 96 | |
1700 | ||
1701 | static int | |
1702 | mips_map_regno (regno) | |
1703 | int regno; | |
1704 | { | |
1705 | if (regno < 32) | |
1706 | return regno; | |
1707 | if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32) | |
1708 | return regno - FP0_REGNUM + 32; | |
1709 | switch (regno) | |
1710 | { | |
1711 | case PC_REGNUM: | |
1712 | return REGNO_OFFSET + 0; | |
1713 | case CAUSE_REGNUM: | |
1714 | return REGNO_OFFSET + 1; | |
1715 | case HI_REGNUM: | |
1716 | return REGNO_OFFSET + 2; | |
1717 | case LO_REGNUM: | |
1718 | return REGNO_OFFSET + 3; | |
1719 | case FCRCS_REGNUM: | |
1720 | return REGNO_OFFSET + 4; | |
1721 | case FCRIR_REGNUM: | |
1722 | return REGNO_OFFSET + 5; | |
1723 | default: | |
1724 | /* FIXME: Is there a way to get the status register? */ | |
1725 | return 0; | |
1726 | } | |
1727 | } | |
1728 | ||
1729 | /* Fetch the remote registers. */ | |
1730 | ||
1731 | static void | |
1732 | mips_fetch_registers (regno) | |
1733 | int regno; | |
1734 | { | |
f4f0d174 | 1735 | unsigned LONGEST val; |
33742334 ILT |
1736 | int err; |
1737 | ||
1738 | if (regno == -1) | |
1739 | { | |
1740 | for (regno = 0; regno < NUM_REGS; regno++) | |
1741 | mips_fetch_registers (regno); | |
1742 | return; | |
1743 | } | |
1744 | ||
021b10e3 JK |
1745 | if (regno == FP_REGNUM || regno == ZERO_REGNUM) |
1746 | /* FP_REGNUM on the mips is a hack which is just supposed to read | |
1747 | zero (see also mips-nat.c). */ | |
1748 | val = 0; | |
1749 | else | |
1750 | { | |
51328506 | 1751 | /* Unfortunately the PMON version in the Vr4300 board has been |
090d784a JSC |
1752 | compiled without the 64bit register access commands. This |
1753 | means we cannot get hold of the full register width. */ | |
5dad8312 | 1754 | if (mips_monitor == MON_DDB) |
51328506 | 1755 | val = (unsigned)mips_request ('t', (unsigned int) mips_map_regno (regno), |
090d784a JSC |
1756 | (unsigned int) 0, &err, mips_receive_wait, NULL); |
1757 | else | |
51328506 | 1758 | val = (unsigned)mips_request ('r', (unsigned int) mips_map_regno (regno), |
090d784a | 1759 | (unsigned int) 0, &err, mips_receive_wait, NULL); |
021b10e3 JK |
1760 | if (err) |
1761 | mips_error ("Can't read register %d: %s", regno, | |
1762 | safe_strerror (errno)); | |
1763 | } | |
33742334 | 1764 | |
34df79fc JK |
1765 | { |
1766 | char buf[MAX_REGISTER_RAW_SIZE]; | |
1767 | ||
1768 | /* We got the number the register holds, but gdb expects to see a | |
1769 | value in the target byte ordering. */ | |
1770 | store_unsigned_integer (buf, REGISTER_RAW_SIZE (regno), val); | |
1771 | supply_register (regno, buf); | |
1772 | } | |
33742334 ILT |
1773 | } |
1774 | ||
1775 | /* Prepare to store registers. The MIPS protocol can store individual | |
1776 | registers, so this function doesn't have to do anything. */ | |
1777 | ||
1778 | static void | |
1779 | mips_prepare_to_store () | |
1780 | { | |
1781 | } | |
1782 | ||
1783 | /* Store remote register(s). */ | |
1784 | ||
1785 | static void | |
1786 | mips_store_registers (regno) | |
1787 | int regno; | |
1788 | { | |
1789 | int err; | |
1790 | ||
1791 | if (regno == -1) | |
1792 | { | |
1793 | for (regno = 0; regno < NUM_REGS; regno++) | |
1794 | mips_store_registers (regno); | |
1795 | return; | |
1796 | } | |
1797 | ||
1798 | mips_request ('R', (unsigned int) mips_map_regno (regno), | |
1799 | (unsigned int) read_register (regno), | |
cd10c7e3 | 1800 | &err, mips_receive_wait, NULL); |
33742334 | 1801 | if (err) |
4fb192be | 1802 | mips_error ("Can't write register %d: %s", regno, safe_strerror (errno)); |
33742334 ILT |
1803 | } |
1804 | ||
1805 | /* Fetch a word from the target board. */ | |
1806 | ||
1807 | static int | |
1808 | mips_fetch_word (addr) | |
1809 | CORE_ADDR addr; | |
1810 | { | |
1811 | int val; | |
1812 | int err; | |
1813 | ||
4c6071f7 | 1814 | val = mips_request ('d', (unsigned int) addr, (unsigned int) 0, &err, |
cd10c7e3 | 1815 | mips_receive_wait, NULL); |
33742334 ILT |
1816 | if (err) |
1817 | { | |
1818 | /* Data space failed; try instruction space. */ | |
4c6071f7 | 1819 | val = mips_request ('i', (unsigned int) addr, (unsigned int) 0, &err, |
cd10c7e3 | 1820 | mips_receive_wait, NULL); |
33742334 | 1821 | if (err) |
4fb192be | 1822 | mips_error ("Can't read address 0x%x: %s", addr, safe_strerror (errno)); |
33742334 ILT |
1823 | } |
1824 | return val; | |
1825 | } | |
1826 | ||
aa56c716 JK |
1827 | /* Store a word to the target board. Returns errno code or zero for |
1828 | success. If OLD_CONTENTS is non-NULL, put the old contents of that | |
1829 | memory location there. */ | |
33742334 | 1830 | |
aa56c716 JK |
1831 | static int |
1832 | mips_store_word (addr, val, old_contents) | |
33742334 ILT |
1833 | CORE_ADDR addr; |
1834 | int val; | |
aa56c716 | 1835 | char *old_contents; |
33742334 ILT |
1836 | { |
1837 | int err; | |
aa56c716 | 1838 | unsigned int oldcontents; |
33742334 | 1839 | |
aa56c716 JK |
1840 | oldcontents = mips_request ('D', (unsigned int) addr, (unsigned int) val, |
1841 | &err, | |
cd10c7e3 | 1842 | mips_receive_wait, NULL); |
33742334 ILT |
1843 | if (err) |
1844 | { | |
1845 | /* Data space failed; try instruction space. */ | |
aa56c716 JK |
1846 | oldcontents = mips_request ('I', (unsigned int) addr, |
1847 | (unsigned int) val, &err, | |
cd10c7e3 | 1848 | mips_receive_wait, NULL); |
33742334 | 1849 | if (err) |
aa56c716 | 1850 | return errno; |
33742334 | 1851 | } |
aa56c716 JK |
1852 | if (old_contents != NULL) |
1853 | store_unsigned_integer (old_contents, 4, oldcontents); | |
1854 | return 0; | |
33742334 ILT |
1855 | } |
1856 | ||
1857 | /* Read or write LEN bytes from inferior memory at MEMADDR, | |
1858 | transferring to or from debugger address MYADDR. Write to inferior | |
1859 | if SHOULD_WRITE is nonzero. Returns length of data written or | |
1860 | read; 0 for error. Note that protocol gives us the correct value | |
1861 | for a longword, since it transfers values in ASCII. We want the | |
1862 | byte values, so we have to swap the longword values. */ | |
1863 | ||
1864 | static int | |
1865 | mips_xfer_memory (memaddr, myaddr, len, write, ignore) | |
1866 | CORE_ADDR memaddr; | |
1867 | char *myaddr; | |
1868 | int len; | |
1869 | int write; | |
1870 | struct target_ops *ignore; | |
1871 | { | |
1872 | register int i; | |
1873 | /* Round starting address down to longword boundary. */ | |
1874 | register CORE_ADDR addr = memaddr &~ 3; | |
1875 | /* Round ending address up; get number of longwords that makes. */ | |
1876 | register int count = (((memaddr + len) - addr) + 3) / 4; | |
1877 | /* Allocate buffer of that many longwords. */ | |
34df79fc | 1878 | register char *buffer = alloca (count * 4); |
33742334 | 1879 | |
aa56c716 JK |
1880 | int status; |
1881 | ||
33742334 ILT |
1882 | if (write) |
1883 | { | |
1884 | /* Fill start and end extra bytes of buffer with existing data. */ | |
1885 | if (addr != memaddr || len < 4) | |
1886 | { | |
1887 | /* Need part of initial word -- fetch it. */ | |
34df79fc | 1888 | store_unsigned_integer (&buffer[0], 4, mips_fetch_word (addr)); |
33742334 ILT |
1889 | } |
1890 | ||
34df79fc | 1891 | if (count > 1) |
33742334 | 1892 | { |
34df79fc JK |
1893 | /* Need part of last word -- fetch it. FIXME: we do this even |
1894 | if we don't need it. */ | |
1895 | store_unsigned_integer (&buffer[(count - 1) * 4], 4, | |
1896 | mips_fetch_word (addr + (count - 1) * 4)); | |
33742334 ILT |
1897 | } |
1898 | ||
1899 | /* Copy data to be written over corresponding part of buffer */ | |
1900 | ||
1901 | memcpy ((char *) buffer + (memaddr & 3), myaddr, len); | |
1902 | ||
1903 | /* Write the entire buffer. */ | |
1904 | ||
1905 | for (i = 0; i < count; i++, addr += 4) | |
1906 | { | |
aa56c716 JK |
1907 | status = mips_store_word (addr, |
1908 | extract_unsigned_integer (&buffer[i*4], 4), | |
1909 | NULL); | |
7d13174e SS |
1910 | /* Report each kilobyte (we download 32-bit words at a time) */ |
1911 | if (i % 256 == 255) | |
1912 | { | |
1913 | printf_unfiltered ("*"); | |
1914 | fflush (stdout); | |
1915 | } | |
aa56c716 JK |
1916 | if (status) |
1917 | { | |
1918 | errno = status; | |
1919 | return 0; | |
1920 | } | |
34df79fc | 1921 | /* FIXME: Do we want a QUIT here? */ |
33742334 | 1922 | } |
7d13174e SS |
1923 | if (count >= 256) |
1924 | printf_unfiltered ("\n"); | |
33742334 ILT |
1925 | } |
1926 | else | |
1927 | { | |
1928 | /* Read all the longwords */ | |
1929 | for (i = 0; i < count; i++, addr += 4) | |
1930 | { | |
34df79fc | 1931 | store_unsigned_integer (&buffer[i*4], 4, mips_fetch_word (addr)); |
33742334 ILT |
1932 | QUIT; |
1933 | } | |
1934 | ||
1935 | /* Copy appropriate bytes out of the buffer. */ | |
34df79fc | 1936 | memcpy (myaddr, buffer + (memaddr & 3), len); |
33742334 ILT |
1937 | } |
1938 | return len; | |
1939 | } | |
1940 | ||
1941 | /* Print info on this target. */ | |
1942 | ||
1943 | static void | |
1944 | mips_files_info (ignore) | |
1945 | struct target_ops *ignore; | |
1946 | { | |
199b2450 | 1947 | printf_unfiltered ("Debugging a MIPS board over a serial line.\n"); |
33742334 ILT |
1948 | } |
1949 | ||
c2a0f1cb ILT |
1950 | /* Kill the process running on the board. This will actually only |
1951 | work if we are doing remote debugging over the console input. I | |
1952 | think that if IDT/sim had the remote debug interrupt enabled on the | |
1953 | right port, we could interrupt the process with a break signal. */ | |
1954 | ||
1955 | static void | |
1956 | mips_kill () | |
1957 | { | |
cd10c7e3 SG |
1958 | if (!mips_wait_flag) |
1959 | return; | |
1960 | ||
1961 | interrupt_count++; | |
1962 | ||
1963 | if (interrupt_count >= 2) | |
1964 | { | |
1965 | interrupt_count = 0; | |
1966 | ||
1967 | target_terminal_ours (); | |
1968 | ||
1969 | if (query ("Interrupted while waiting for the program.\n\ | |
1970 | Give up (and stop debugging it)? ")) | |
1971 | { | |
1972 | /* Clean up in such a way that mips_close won't try to talk to the | |
1973 | board (it almost surely won't work since we weren't able to talk to | |
1974 | it). */ | |
1975 | mips_wait_flag = 0; | |
1976 | mips_is_open = 0; | |
1977 | SERIAL_CLOSE (mips_desc); | |
1978 | ||
1979 | printf_unfiltered ("Ending remote MIPS debugging.\n"); | |
1980 | target_mourn_inferior (); | |
1981 | ||
1982 | return_to_top_level (RETURN_QUIT); | |
1983 | } | |
1984 | ||
1985 | target_terminal_inferior (); | |
1986 | } | |
1987 | ||
1988 | if (remote_debug > 0) | |
1989 | printf_unfiltered ("Sending break\n"); | |
1990 | ||
1991 | SERIAL_SEND_BREAK (mips_desc); | |
1992 | ||
c2a0f1cb ILT |
1993 | #if 0 |
1994 | if (mips_is_open) | |
1995 | { | |
1996 | char cc; | |
1997 | ||
1998 | /* Send a ^C. */ | |
1999 | cc = '\003'; | |
1724c671 | 2000 | SERIAL_WRITE (mips_desc, &cc, 1); |
c2a0f1cb ILT |
2001 | sleep (1); |
2002 | target_mourn_inferior (); | |
2003 | } | |
2004 | #endif | |
2005 | } | |
2006 | ||
33742334 ILT |
2007 | /* Start running on the target board. */ |
2008 | ||
2009 | static void | |
2010 | mips_create_inferior (execfile, args, env) | |
2011 | char *execfile; | |
2012 | char *args; | |
2013 | char **env; | |
2014 | { | |
2015 | CORE_ADDR entry_pt; | |
2016 | ||
33742334 | 2017 | if (args && *args) |
aa56c716 JK |
2018 | { |
2019 | warning ("\ | |
2020 | Can't pass arguments to remote MIPS board; arguments ignored."); | |
2021 | /* And don't try to use them on the next "run" command. */ | |
2022 | execute_command ("set args", 0); | |
2023 | } | |
33742334 ILT |
2024 | |
2025 | if (execfile == 0 || exec_bfd == 0) | |
aa56c716 | 2026 | error ("No executable file specified"); |
33742334 ILT |
2027 | |
2028 | entry_pt = (CORE_ADDR) bfd_get_start_address (exec_bfd); | |
2029 | ||
2030 | init_wait_for_inferior (); | |
2031 | ||
c2a0f1cb ILT |
2032 | /* FIXME: Should we set inferior_pid here? */ |
2033 | ||
cd10c7e3 | 2034 | /* start-sanitize-gm */ |
188c635f | 2035 | #ifdef GENERAL_MAGIC |
cd10c7e3 SG |
2036 | magic_create_inferior_hook (); |
2037 | proceed (entry_pt, TARGET_SIGNAL_PWR, 0); | |
2038 | #else | |
2039 | /* end-sanitize-gm */ | |
45dc9be3 | 2040 | proceed (entry_pt, TARGET_SIGNAL_DEFAULT, 0); |
cd10c7e3 | 2041 | /* start-sanitize-gm */ |
188c635f | 2042 | #endif /* GENERAL_MAGIC */ |
cd10c7e3 | 2043 | /* end-sanitize-gm */ |
33742334 ILT |
2044 | } |
2045 | ||
2046 | /* Clean up after a process. Actually nothing to do. */ | |
2047 | ||
2048 | static void | |
2049 | mips_mourn_inferior () | |
2050 | { | |
090d784a JSC |
2051 | if (current_ops != NULL) |
2052 | unpush_target (current_ops); | |
33742334 ILT |
2053 | generic_mourn_inferior (); |
2054 | } | |
2055 | \f | |
aa56c716 JK |
2056 | /* We can write a breakpoint and read the shadow contents in one |
2057 | operation. */ | |
2058 | ||
2059 | /* The IDT board uses an unusual breakpoint value, and sometimes gets | |
2060 | confused when it sees the usual MIPS breakpoint instruction. */ | |
2061 | ||
1a406ce8 ILT |
2062 | #define BREAK_INSN (0x00000a0d) |
2063 | #define BREAK_INSN_SIZE (4) | |
aa56c716 JK |
2064 | |
2065 | /* Insert a breakpoint on targets that don't have any better breakpoint | |
2066 | support. We read the contents of the target location and stash it, | |
2067 | then overwrite it with a breakpoint instruction. ADDR is the target | |
2068 | location in the target machine. CONTENTS_CACHE is a pointer to | |
2069 | memory allocated for saving the target contents. It is guaranteed | |
2070 | by the caller to be long enough to save sizeof BREAKPOINT bytes (this | |
2071 | is accomplished via BREAKPOINT_MAX). */ | |
2072 | ||
2073 | static int | |
2074 | mips_insert_breakpoint (addr, contents_cache) | |
2075 | CORE_ADDR addr; | |
2076 | char *contents_cache; | |
2077 | { | |
2078 | int status; | |
2079 | ||
cd10c7e3 SG |
2080 | if (monitor_supports_breakpoints) |
2081 | return common_breakpoint ('B', addr, 0x3, "f"); | |
2082 | ||
1a406ce8 | 2083 | return mips_store_word (addr, BREAK_INSN, contents_cache); |
aa56c716 JK |
2084 | } |
2085 | ||
2086 | static int | |
2087 | mips_remove_breakpoint (addr, contents_cache) | |
2088 | CORE_ADDR addr; | |
2089 | char *contents_cache; | |
2090 | { | |
cd10c7e3 SG |
2091 | if (monitor_supports_breakpoints) |
2092 | return common_breakpoint ('b', addr, 0, NULL); | |
2093 | ||
1a406ce8 | 2094 | return target_write_memory (addr, contents_cache, BREAK_INSN_SIZE); |
aa56c716 | 2095 | } |
4704fd9c | 2096 | |
090d784a JSC |
2097 | #if 0 /* currently not used */ |
2098 | /* PMON does not currently provide support for the debug mode 'b' | |
2099 | commands to manipulate breakpoints. However, if we wanted to use | |
2100 | the monitor breakpoints (rather than the GDB BREAK_INSN version) | |
2101 | then this code performs the work needed to leave debug mode, | |
2102 | set/clear the breakpoint, and then return to debug mode. */ | |
2103 | ||
2104 | #define PMON_MAX_BP (33) /* 32 SW, 1 HW */ | |
2105 | static CORE_ADDR mips_pmon_bp_info[PMON_MAX_BP]; | |
2106 | /* NOTE: The code relies on this vector being zero-initialised by the system */ | |
2107 | ||
2108 | static int | |
2109 | pmon_insert_breakpoint (addr, contents_cache) | |
2110 | CORE_ADDR addr; | |
2111 | char *contents_cache; | |
2112 | { | |
2113 | int status; | |
2114 | ||
2115 | if (monitor_supports_breakpoints) | |
2116 | { | |
2117 | char tbuff[12]; /* space for breakpoint command */ | |
2118 | int bpnum; | |
2119 | CORE_ADDR bpaddr; | |
2120 | ||
2121 | /* PMON does not support debug level breakpoint set/remove: */ | |
2122 | if (mips_exit_debug ()) | |
2123 | mips_error ("Failed to exit debug mode"); | |
2124 | ||
2125 | sprintf (tbuff, "b %08x\015", addr); | |
2126 | mips_send_command (tbuff, 0); | |
2127 | ||
2128 | mips_expect ("Bpt "); | |
2129 | ||
2130 | if (!mips_getstring (tbuff, 2)) | |
2131 | return 1; | |
2132 | tbuff[2] = '\0'; /* terminate the string */ | |
2133 | if (sscanf (tbuff, "%d", &bpnum) != 1) | |
2134 | { | |
2135 | fprintf_unfiltered (stderr, "Invalid decimal breakpoint number from target: %s\n", tbuff); | |
2136 | return 1; | |
2137 | } | |
2138 | ||
2139 | mips_expect (" = "); | |
2140 | ||
2141 | /* Lead in the hex number we are expecting: */ | |
2142 | tbuff[0] = '0'; | |
2143 | tbuff[1] = 'x'; | |
2144 | ||
2145 | if (!mips_getstring (&tbuff[2], 8)) | |
2146 | return 1; | |
2147 | tbuff[10] = '\0'; /* terminate the string */ | |
2148 | ||
2149 | if (sscanf (tbuff, "0x%08x", &bpaddr) != 1) | |
2150 | { | |
2151 | fprintf_unfiltered (stderr, "Invalid hex address from target: %s\n", tbuff); | |
2152 | return 1; | |
2153 | } | |
2154 | ||
2155 | if (bpnum >= PMON_MAX_BP) | |
2156 | { | |
2157 | fprintf_unfiltered (stderr, "Error: Returned breakpoint number %d outside acceptable range (0..%d)\n", | |
2158 | bpnum, PMON_MAX_BP - 1); | |
2159 | return 1; | |
2160 | } | |
2161 | ||
2162 | if (bpaddr != addr) | |
2163 | fprintf_unfiltered (stderr, "Warning: Breakpoint addresses do not match: 0x%x != 0x%x\n", addr, bpaddr); | |
2164 | ||
2165 | mips_pmon_bp_info[bpnum] = bpaddr; | |
2166 | ||
2167 | mips_expect ("\015\012"); | |
2168 | mips_expect (mips_monitor_prompt); | |
2169 | ||
2170 | mips_enter_debug (); | |
2171 | ||
2172 | return 0; | |
2173 | } | |
2174 | ||
2175 | return mips_store_word (addr, BREAK_INSN, contents_cache); | |
2176 | } | |
2177 | ||
2178 | static int | |
2179 | pmon_remove_breakpoint (addr, contents_cache) | |
2180 | CORE_ADDR addr; | |
2181 | char *contents_cache; | |
2182 | { | |
2183 | if (monitor_supports_breakpoints) | |
2184 | { | |
2185 | int bpnum; | |
2186 | char tbuff[7]; /* enough for delete breakpoint command */ | |
2187 | ||
2188 | for (bpnum = 0; bpnum < PMON_MAX_BP; bpnum++) | |
2189 | if (mips_pmon_bp_info[bpnum] == addr) | |
2190 | break; | |
2191 | ||
2192 | if (bpnum >= PMON_MAX_BP) | |
2193 | { | |
2194 | fprintf_unfiltered (stderr, "pmon_remove_breakpoint: Failed to find breakpoint at address 0x%x\n", addr); | |
2195 | return 1; | |
2196 | } | |
2197 | ||
2198 | if (mips_exit_debug ()) | |
2199 | mips_error ("Failed to exit debug mode"); | |
2200 | ||
2201 | sprintf (tbuff, "db %02d\015", bpnum); | |
2202 | ||
2203 | mips_send_command (tbuff, -1); | |
2204 | /* NOTE: If the breakpoint does not exist then a "Bpt <dd> not | |
2205 | set" message will be returned. */ | |
2206 | ||
2207 | mips_enter_debug (); | |
2208 | ||
2209 | return 0; | |
2210 | } | |
2211 | ||
2212 | return target_write_memory (addr, contents_cache, BREAK_INSN_SIZE); | |
2213 | } | |
2214 | #endif | |
2215 | ||
cd10c7e3 SG |
2216 | /* Compute a don't care mask for the region bounding ADDR and ADDR + LEN - 1. |
2217 | This is used for memory ref breakpoints. */ | |
2218 | ||
2219 | static unsigned long | |
2220 | calculate_mask (addr, len) | |
2221 | CORE_ADDR addr; | |
2222 | int len; | |
2223 | { | |
2224 | unsigned long mask; | |
2225 | int i; | |
2226 | ||
2227 | mask = addr ^ (addr + len - 1); | |
2228 | ||
2229 | for (i = 32; i >= 0; i--) | |
2230 | if (mask == 0) | |
2231 | break; | |
2232 | else | |
2233 | mask >>= 1; | |
2234 | ||
2235 | mask = (unsigned long) 0xffffffff >> i; | |
2236 | ||
2237 | return mask; | |
2238 | } | |
2239 | ||
2240 | /* Set a data watchpoint. ADDR and LEN should be obvious. TYPE is either 1 | |
2241 | for a read watchpoint, or 2 for a read/write watchpoint. */ | |
2242 | ||
2243 | int | |
2244 | remote_mips_set_watchpoint (addr, len, type) | |
2245 | CORE_ADDR addr; | |
2246 | int len; | |
2247 | int type; | |
2248 | { | |
2249 | CORE_ADDR first_addr; | |
2250 | unsigned long mask; | |
2251 | char *flags; | |
2252 | ||
2253 | mask = calculate_mask (addr, len); | |
2254 | ||
2255 | first_addr = addr & ~mask; | |
2256 | ||
2257 | switch (type) | |
2258 | { | |
2259 | case 0: /* write */ | |
2260 | flags = "w"; | |
2261 | break; | |
2262 | case 1: /* read */ | |
2263 | flags = "r"; | |
2264 | break; | |
2265 | case 2: /* read/write */ | |
2266 | flags = "rw"; | |
2267 | break; | |
2268 | default: | |
2269 | abort (); | |
2270 | } | |
2271 | ||
2272 | if (common_breakpoint ('B', first_addr, mask, flags)) | |
2273 | return -1; | |
2274 | ||
2275 | return 0; | |
2276 | } | |
2277 | ||
2278 | int | |
2279 | remote_mips_remove_watchpoint (addr, len, type) | |
2280 | CORE_ADDR addr; | |
2281 | int len; | |
2282 | int type; | |
2283 | { | |
2284 | CORE_ADDR first_addr; | |
2285 | unsigned long mask; | |
2286 | ||
2287 | mask = calculate_mask (addr, len); | |
2288 | ||
2289 | first_addr = addr & ~mask; | |
2290 | ||
2291 | if (common_breakpoint ('b', first_addr, 0, NULL)) | |
2292 | return -1; | |
2293 | ||
2294 | return 0; | |
2295 | } | |
2296 | ||
2297 | int | |
2298 | remote_mips_stopped_by_watchpoint () | |
2299 | { | |
2300 | return hit_watchpoint; | |
2301 | } | |
2302 | ||
2303 | /* This routine generates the a breakpoint command of the form: | |
2304 | ||
2305 | 0x0 <CMD> <ADDR> <MASK> <FLAGS> | |
2306 | ||
2307 | Where <CMD> is one of: `B' to set, or `b' to clear a breakpoint. <ADDR> is | |
2308 | the address of the breakpoint. <MASK> is a don't care mask for addresses. | |
2309 | <FLAGS> is any combination of `r', `w', or `f' for read/write/or fetch. */ | |
2310 | ||
2311 | static int | |
2312 | common_breakpoint (cmd, addr, mask, flags) | |
2313 | int cmd; | |
2314 | CORE_ADDR addr; | |
2315 | CORE_ADDR mask; | |
2316 | char *flags; | |
2317 | { | |
2318 | int len; | |
2319 | char buf[DATA_MAXLEN + 1]; | |
2320 | char rcmd; | |
2321 | int rpid, rerrflg, rresponse; | |
2322 | int nfields; | |
2323 | ||
2324 | if (flags) | |
2325 | sprintf (buf, "0x0 %c 0x%x 0x%x %s", cmd, addr, mask, flags); | |
2326 | else | |
2327 | sprintf (buf, "0x0 %c 0x%x", cmd, addr); | |
2328 | ||
2329 | mips_send_packet (buf, 1); | |
2330 | ||
2331 | len = mips_receive_packet (buf, 1, mips_receive_wait); | |
4f005fea | 2332 | buf[len] = '\0'; |
cd10c7e3 SG |
2333 | |
2334 | nfields = sscanf (buf, "0x%x %c 0x%x 0x%x", &rpid, &rcmd, &rerrflg, &rresponse); | |
2335 | ||
2336 | if (nfields != 4 | |
2337 | || rcmd != cmd) | |
2338 | mips_error ("common_breakpoint: Bad response from remote board: %s", buf); | |
2339 | ||
2340 | if (rerrflg != 0) | |
2341 | { | |
5dad8312 | 2342 | /* Ddb returns "0x0 b 0x16 0x0\000", whereas |
51328506 | 2343 | Cogent returns "0x0 b 0xffffffff 0x16\000": */ |
5dad8312 | 2344 | if (mips_monitor == MON_DDB) |
51328506 | 2345 | rresponse = rerrflg; |
3308a107 | 2346 | if (rresponse != 22) /* invalid argument */ |
cd10c7e3 | 2347 | fprintf_unfiltered (stderr, "common_breakpoint (0x%x): Got error: 0x%x\n", |
51328506 | 2348 | (unsigned int)addr, rresponse); |
cd10c7e3 SG |
2349 | return 1; |
2350 | } | |
2351 | ||
2352 | return 0; | |
2353 | } | |
2354 | \f | |
4704fd9c SG |
2355 | static void |
2356 | send_srec (srec, len, addr) | |
2357 | char *srec; | |
2358 | int len; | |
2359 | CORE_ADDR addr; | |
2360 | { | |
2361 | while (1) | |
2362 | { | |
2363 | int ch; | |
2364 | ||
2365 | SERIAL_WRITE (mips_desc, srec, len); | |
2366 | ||
2367 | ch = mips_readchar (2); | |
2368 | ||
2369 | switch (ch) | |
2370 | { | |
2371 | case SERIAL_TIMEOUT: | |
2372 | error ("Timeout during download."); | |
2373 | break; | |
2374 | case 0x6: /* ACK */ | |
2375 | return; | |
2376 | case 0x15: /* NACK */ | |
2377 | fprintf_unfiltered (gdb_stderr, "Download got a NACK at byte %d! Retrying.\n", addr); | |
2378 | continue; | |
2379 | default: | |
2380 | error ("Download got unexpected ack char: 0x%x, retrying.\n", ch); | |
2381 | } | |
2382 | } | |
2383 | } | |
2384 | ||
2385 | /* Download a binary file by converting it to S records. */ | |
2386 | ||
2387 | static void | |
2388 | mips_load_srec (args) | |
2389 | char *args; | |
2390 | { | |
2391 | bfd *abfd; | |
2392 | asection *s; | |
2393 | char *buffer, srec[1024]; | |
2394 | int i; | |
2395 | int srec_frame = 200; | |
2396 | int reclen; | |
2397 | static int hashmark = 1; | |
2398 | ||
2399 | buffer = alloca (srec_frame * 2 + 256); | |
2400 | ||
2401 | abfd = bfd_openr (args, 0); | |
2402 | if (!abfd) | |
2403 | { | |
2404 | printf_filtered ("Unable to open file %s\n", args); | |
2405 | return; | |
2406 | } | |
2407 | ||
2408 | if (bfd_check_format (abfd, bfd_object) == 0) | |
2409 | { | |
2410 | printf_filtered ("File is not an object file\n"); | |
2411 | return; | |
2412 | } | |
4704fd9c | 2413 | |
090d784a JSC |
2414 | /* This actually causes a download in the IDT binary format: */ |
2415 | #define LOAD_CMD "load -b -s tty0\015" | |
2416 | mips_send_command (LOAD_CMD, 0); | |
4704fd9c SG |
2417 | |
2418 | for (s = abfd->sections; s; s = s->next) | |
2419 | { | |
2420 | if (s->flags & SEC_LOAD) | |
2421 | { | |
2422 | int numbytes; | |
2423 | ||
2424 | printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s->name, s->vma, | |
2425 | s->vma + s->_raw_size); | |
2426 | gdb_flush (gdb_stdout); | |
2427 | ||
2428 | for (i = 0; i < s->_raw_size; i += numbytes) | |
2429 | { | |
2430 | numbytes = min (srec_frame, s->_raw_size - i); | |
2431 | ||
2432 | bfd_get_section_contents (abfd, s, buffer, i, numbytes); | |
2433 | ||
2434 | reclen = mips_make_srec (srec, '3', s->vma + i, buffer, numbytes); | |
2435 | send_srec (srec, reclen, s->vma + i); | |
2436 | ||
2437 | if (hashmark) | |
2438 | { | |
2439 | putchar_unfiltered ('#'); | |
2440 | gdb_flush (gdb_stdout); | |
2441 | } | |
2442 | ||
2443 | } /* Per-packet (or S-record) loop */ | |
2444 | ||
2445 | putchar_unfiltered ('\n'); | |
2446 | } /* Loadable sections */ | |
2447 | } | |
2448 | if (hashmark) | |
2449 | putchar_unfiltered ('\n'); | |
2450 | ||
2451 | /* Write a type 7 terminator record. no data for a type 7, and there | |
2452 | is no data, so len is 0. */ | |
2453 | ||
2454 | reclen = mips_make_srec (srec, '7', abfd->start_address, NULL, 0); | |
2455 | ||
2456 | send_srec (srec, reclen, abfd->start_address); | |
2457 | ||
2458 | SERIAL_FLUSH_INPUT (mips_desc); | |
2459 | } | |
2460 | ||
2461 | /* | |
2462 | * mips_make_srec -- make an srecord. This writes each line, one at a | |
2463 | * time, each with it's own header and trailer line. | |
2464 | * An srecord looks like this: | |
2465 | * | |
2466 | * byte count-+ address | |
2467 | * start ---+ | | data +- checksum | |
2468 | * | | | | | |
2469 | * S01000006F6B692D746573742E73726563E4 | |
2470 | * S315000448600000000000000000FC00005900000000E9 | |
2471 | * S31A0004000023C1400037DE00F023604000377B009020825000348D | |
2472 | * S30B0004485A0000000000004E | |
2473 | * S70500040000F6 | |
2474 | * | |
2475 | * S<type><length><address><data><checksum> | |
2476 | * | |
2477 | * Where | |
2478 | * - length | |
2479 | * is the number of bytes following upto the checksum. Note that | |
2480 | * this is not the number of chars following, since it takes two | |
2481 | * chars to represent a byte. | |
2482 | * - type | |
2483 | * is one of: | |
2484 | * 0) header record | |
2485 | * 1) two byte address data record | |
2486 | * 2) three byte address data record | |
2487 | * 3) four byte address data record | |
2488 | * 7) four byte address termination record | |
2489 | * 8) three byte address termination record | |
2490 | * 9) two byte address termination record | |
2491 | * | |
2492 | * - address | |
2493 | * is the start address of the data following, or in the case of | |
2494 | * a termination record, the start address of the image | |
2495 | * - data | |
2496 | * is the data. | |
2497 | * - checksum | |
2498 | * is the sum of all the raw byte data in the record, from the length | |
2499 | * upwards, modulo 256 and subtracted from 255. | |
2500 | * | |
2501 | * This routine returns the length of the S-record. | |
2502 | * | |
2503 | */ | |
2504 | ||
2505 | static int | |
2506 | mips_make_srec (buf, type, memaddr, myaddr, len) | |
2507 | char *buf; | |
cd10c7e3 | 2508 | int type; |
4704fd9c SG |
2509 | CORE_ADDR memaddr; |
2510 | unsigned char *myaddr; | |
2511 | int len; | |
2512 | { | |
2513 | unsigned char checksum; | |
2514 | int i; | |
2515 | ||
2516 | /* Create the header for the srec. addr_size is the number of bytes in the address, | |
2517 | and 1 is the number of bytes in the count. */ | |
2518 | ||
2519 | buf[0] = 'S'; | |
2520 | buf[1] = type; | |
2521 | buf[2] = len + 4 + 1; /* len + 4 byte address + 1 byte checksum */ | |
090d784a JSC |
2522 | /* This assumes S3 style downloads (4byte addresses). There should |
2523 | probably be a check, or the code changed to make it more | |
2524 | explicit. */ | |
4704fd9c SG |
2525 | buf[3] = memaddr >> 24; |
2526 | buf[4] = memaddr >> 16; | |
2527 | buf[5] = memaddr >> 8; | |
2528 | buf[6] = memaddr; | |
2529 | memcpy (&buf[7], myaddr, len); | |
2530 | ||
090d784a JSC |
2531 | /* Note that the checksum is calculated on the raw data, not the |
2532 | hexified data. It includes the length, address and the data | |
2533 | portions of the packet. */ | |
4704fd9c SG |
2534 | checksum = 0; |
2535 | buf += 2; /* Point at length byte */ | |
2536 | for (i = 0; i < len + 4 + 1; i++) | |
2537 | checksum += *buf++; | |
2538 | ||
2539 | *buf = ~checksum; | |
2540 | ||
2541 | return len + 8; | |
2542 | } | |
2543 | ||
090d784a JSC |
2544 | /* The following manifest controls whether we enable the simple flow |
2545 | control support provided by the monitor. If enabled the code will | |
2546 | wait for an affirmative ACK between transmitting packets. */ | |
2547 | #define DOETXACK (1) | |
2548 | ||
2549 | /* The PMON fast-download uses an encoded packet format constructed of | |
2550 | 3byte data packets (encoded as 4 printable ASCII characters), and | |
2551 | escape sequences (preceded by a '/'): | |
2552 | ||
2553 | 'K' clear checksum | |
2554 | 'C' compare checksum (12bit value, not included in checksum calculation) | |
2555 | 'S' define symbol name (for addr) terminated with "," and padded to 4char boundary | |
2556 | 'Z' zero fill multiple of 3bytes | |
2557 | 'B' byte (12bit encoded value, of 8bit data) | |
2558 | 'A' address (36bit encoded value) | |
2559 | 'E' define entry as original address, and exit load | |
2560 | ||
2561 | The packets are processed in 4 character chunks, so the escape | |
2562 | sequences that do not have any data (or variable length data) | |
2563 | should be padded to a 4 character boundary. The decoder will give | |
2564 | an error if the complete message block size is not a multiple of | |
2565 | 4bytes (size of record). | |
2566 | ||
2567 | The encoding of numbers is done in 6bit fields. The 6bit value is | |
2568 | used to index into this string to get the specific character | |
2569 | encoding for the value: */ | |
102f473b | 2570 | static char encoding[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789,."; |
090d784a JSC |
2571 | |
2572 | /* Convert the number of bits required into an encoded number, 6bits | |
2573 | at a time (range 0..63). Keep a checksum if required (passed | |
2574 | pointer non-NULL). The function returns the number of encoded | |
2575 | characters written into the buffer. */ | |
2576 | static int | |
2577 | pmon_makeb64 (v, p, n, chksum) | |
2578 | unsigned long v; | |
2579 | char *p; | |
2580 | int n; | |
2581 | int *chksum; | |
2582 | { | |
2583 | int count = (n / 6); | |
2584 | ||
2585 | if ((n % 12) != 0) { | |
2586 | fprintf_unfiltered(stderr,"Fast encoding bitcount must be a multiple of 12bits: %dbit%s\n",n,(n == 1)?"":"s"); | |
2587 | return(0); | |
2588 | } | |
2589 | if (n > 36) { | |
2590 | fprintf_unfiltered(stderr,"Fast encoding cannot process more than 36bits at the moment: %dbits\n",n); | |
2591 | return(0); | |
2592 | } | |
2593 | ||
2594 | /* Deal with the checksum: */ | |
2595 | if (chksum != NULL) { | |
2596 | switch (n) { | |
2597 | case 36: *chksum += ((v >> 24) & 0xFFF); | |
2598 | case 24: *chksum += ((v >> 12) & 0xFFF); | |
2599 | case 12: *chksum += ((v >> 0) & 0xFFF); | |
2600 | } | |
2601 | } | |
2602 | ||
2603 | do { | |
2604 | n -= 6; | |
2605 | *p++ = encoding[(v >> n) & 0x3F]; | |
2606 | } while (n > 0); | |
2607 | ||
2608 | return(count); | |
2609 | } | |
2610 | ||
2611 | /* Shorthand function (that could be in-lined) to output the zero-fill | |
2612 | escape sequence into the data stream. */ | |
2613 | static int | |
2614 | pmon_zeroset (recsize, buff, amount, chksum) | |
2615 | int recsize; | |
2616 | char **buff; | |
2617 | int *amount; | |
2618 | unsigned int *chksum; | |
2619 | { | |
2620 | int count; | |
2621 | ||
2622 | sprintf(*buff,"/Z"); | |
2623 | count = pmon_makeb64 (*amount, (*buff + 2), 12, chksum); | |
2624 | *buff += (count + 2); | |
2625 | *amount = 0; | |
2626 | return(recsize + count + 2); | |
2627 | } | |
2628 | ||
2629 | static int | |
2630 | pmon_checkset (recsize, buff, value) | |
2631 | int recsize; | |
2632 | char **buff; | |
2633 | int *value; | |
2634 | { | |
2635 | int count; | |
2636 | ||
2637 | /* Add the checksum (without updating the value): */ | |
2638 | sprintf (*buff, "/C"); | |
2639 | count = pmon_makeb64 (*value, (*buff + 2), 12, NULL); | |
2640 | *buff += (count + 2); | |
2641 | sprintf (*buff, "\015"); | |
2642 | *buff += 2; /* include zero terminator */ | |
2643 | /* Forcing a checksum validation clears the sum: */ | |
2644 | *value = 0; | |
2645 | return(recsize + count + 3); | |
2646 | } | |
2647 | ||
2648 | /* Amount of padding we leave after at the end of the output buffer, | |
2649 | for the checksum and line termination characters: */ | |
2650 | #define CHECKSIZE (4 + 4 + 4 + 2) | |
2651 | /* zero-fill, checksum, transfer end and line termination space. */ | |
2652 | ||
2653 | /* The amount of binary data loaded from the object file in a single | |
2654 | operation: */ | |
2655 | #define BINCHUNK (1024) | |
2656 | ||
2657 | /* Maximum line of data accepted by the monitor: */ | |
2658 | #define MAXRECSIZE (550) | |
2659 | /* NOTE: This constant depends on the monitor being used. This value | |
2660 | is for PMON 5.x on the Cogent Vr4300 board. */ | |
2661 | ||
2662 | static void | |
2663 | pmon_make_fastrec (outbuf, inbuf, inptr, inamount, recsize, csum, zerofill) | |
2664 | char **outbuf; | |
2665 | unsigned char *inbuf; | |
2666 | int *inptr; | |
2667 | int inamount; | |
2668 | int *recsize; | |
2669 | unsigned int *csum; | |
2670 | unsigned int *zerofill; | |
2671 | { | |
2672 | int count = 0; | |
2673 | char *p = *outbuf; | |
2674 | ||
2675 | /* This is a simple check to ensure that our data will fit within | |
2676 | the maximum allowable record size. Each record output is 4bytes | |
2677 | in length. We must allow space for a pending zero fill command, | |
2678 | the record, and a checksum record. */ | |
2679 | while ((*recsize < (MAXRECSIZE - CHECKSIZE)) && ((inamount - *inptr) > 0)) { | |
2680 | /* Process the binary data: */ | |
2681 | if ((inamount - *inptr) < 3) { | |
2682 | if (*zerofill != 0) | |
2683 | *recsize = pmon_zeroset (*recsize, &p, zerofill, csum); | |
2684 | sprintf (p, "/B"); | |
2685 | count = pmon_makeb64 (inbuf[*inptr], &p[2], 12, csum); | |
2686 | p += (2 + count); | |
2687 | *recsize += (2 + count); | |
2688 | (*inptr)++; | |
2689 | } else { | |
2690 | unsigned int value = ((inbuf[*inptr + 0] << 16) | (inbuf[*inptr + 1] << 8) | inbuf[*inptr + 2]); | |
2691 | /* Simple check for zero data. TODO: A better check would be | |
2692 | to check the last, and then the middle byte for being zero | |
2693 | (if the first byte is not). We could then check for | |
2694 | following runs of zeros, and if above a certain size it is | |
2695 | worth the 4 or 8 character hit of the byte insertions used | |
2696 | to pad to the start of the zeroes. NOTE: This also depends | |
2697 | on the alignment at the end of the zero run. */ | |
2698 | if (value == 0x00000000) { | |
2699 | (*zerofill)++; | |
2700 | if (*zerofill == 0xFFF) /* 12bit counter */ | |
2701 | *recsize = pmon_zeroset (*recsize, &p, zerofill, csum); | |
2702 | }else { | |
2703 | if (*zerofill != 0) | |
2704 | *recsize = pmon_zeroset (*recsize, &p, zerofill, csum); | |
2705 | count = pmon_makeb64 (value, p, 24, csum); | |
2706 | p += count; | |
2707 | *recsize += count; | |
2708 | } | |
2709 | *inptr += 3; | |
2710 | } | |
2711 | } | |
2712 | ||
2713 | *outbuf = p; | |
2714 | return; | |
2715 | } | |
2716 | ||
2717 | #if defined(DOETXACK) | |
2718 | static int | |
2719 | pmon_check_ack() | |
2720 | { | |
2721 | int c = SERIAL_READCHAR (mips_desc, 2); | |
2722 | if ((c == SERIAL_TIMEOUT) || (c != 0x06)) { | |
4f005fea | 2723 | fprintf_unfiltered (gdb_stderr, "Failed to receive valid ACK\n"); |
090d784a JSC |
2724 | return(-1); /* terminate the download */ |
2725 | } | |
2726 | return(0); | |
2727 | } | |
2728 | #endif /* DOETXACK */ | |
2729 | ||
2730 | static void | |
2731 | pmon_load_fast (file) | |
2732 | char *file; | |
2733 | { | |
2734 | bfd *abfd; | |
2735 | asection *s; | |
2736 | unsigned char *binbuf; | |
2737 | char *buffer; | |
2738 | int reclen; | |
2739 | unsigned int csum = 0; | |
2740 | static int hashmark = 1; | |
2741 | int bintotal = 0; | |
2742 | int final; | |
2743 | int finished = 0; | |
2744 | ||
c37c7c6c FF |
2745 | buffer = (char *)xmalloc(MAXRECSIZE + 1); |
2746 | binbuf = (unsigned char *)xmalloc(BINCHUNK); | |
090d784a JSC |
2747 | |
2748 | abfd = bfd_openr(file,0); | |
2749 | if (!abfd) | |
2750 | { | |
2751 | printf_filtered ("Unable to open file %s\n",file); | |
2752 | return; | |
2753 | } | |
2754 | ||
2755 | if (bfd_check_format(abfd,bfd_object) == 0) | |
2756 | { | |
2757 | printf_filtered("File is not an object file\n"); | |
2758 | return; | |
2759 | } | |
2760 | ||
2761 | /* Setup the required download state: */ | |
2762 | mips_send_command ("set dlproto etxack\015", -1); | |
2763 | mips_send_command ("set dlecho off\015", -1); | |
2764 | /* NOTE: We get a "cannot set variable" message if the variable is | |
2765 | already defined to have the argument we give. The code doesn't | |
2766 | care, since it just scans to the next prompt anyway. */ | |
2767 | /* Start the download: */ | |
2768 | mips_send_command (LOAD_CMD, 0); | |
2769 | mips_expect ("Downloading from tty0, ^C to abort\015\012"); | |
2770 | ||
2771 | /* Zero the checksum */ | |
2772 | sprintf(buffer,"/Kxx\015"); | |
2773 | reclen = strlen(buffer); | |
2774 | SERIAL_WRITE (mips_desc, buffer, reclen); | |
2775 | ||
2776 | #if defined(DOETXACK) | |
2777 | finished = pmon_check_ack(); | |
2778 | #endif /* DOETXACK */ | |
2779 | ||
2780 | for (s = abfd->sections; s && !finished; s = s->next) | |
2781 | if (s->flags & SEC_LOAD) /* only deal with loadable sections */ | |
2782 | { | |
2783 | bintotal += s->_raw_size; | |
2784 | final = (s->vma + s->_raw_size); | |
2785 | ||
51328506 JSC |
2786 | printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s->name, (unsigned int)s->vma, |
2787 | (unsigned int)(s->vma + s->_raw_size)); | |
090d784a JSC |
2788 | gdb_flush (gdb_stdout); |
2789 | ||
2790 | /* Output the starting address */ | |
2791 | sprintf(buffer,"/A"); | |
2792 | reclen = pmon_makeb64(s->vma,&buffer[2],36,&csum); | |
2793 | buffer[2 + reclen] = '\015'; | |
2794 | buffer[3 + reclen] = '\0'; | |
2795 | reclen += 3; /* for the initial escape code and carriage return */ | |
2796 | SERIAL_WRITE (mips_desc, buffer, reclen); | |
2797 | #if defined(DOETXACK) | |
2798 | finished = pmon_check_ack(); | |
2799 | #endif /* DOETXACK */ | |
2800 | ||
2801 | if (!finished) | |
2802 | { | |
2803 | int binamount; | |
2804 | unsigned int zerofill = 0; | |
2805 | char *bp = buffer; | |
2806 | int i; | |
2807 | ||
2808 | reclen = 0; | |
2809 | ||
2810 | for (i = 0; ((i < s->_raw_size) && !finished); i += binamount) { | |
2811 | int binptr = 0; | |
2812 | ||
2813 | binamount = min (BINCHUNK, s->_raw_size - i); | |
2814 | ||
2815 | bfd_get_section_contents (abfd, s, binbuf, i, binamount); | |
2816 | ||
2817 | /* This keeps a rolling checksum, until we decide to output | |
2818 | the line: */ | |
2819 | for (; ((binamount - binptr) > 0);) { | |
2820 | pmon_make_fastrec (&bp, binbuf, &binptr, binamount, &reclen, &csum, &zerofill); | |
2821 | if (reclen >= (MAXRECSIZE - CHECKSIZE)) { | |
2822 | reclen = pmon_checkset (reclen, &bp, &csum); | |
2823 | SERIAL_WRITE (mips_desc, buffer, reclen); | |
2824 | #if defined(DOETXACK) | |
2825 | finished = pmon_check_ack(); | |
2826 | if (finished) { | |
2827 | zerofill = 0; /* do not transmit pending zerofills */ | |
2828 | break; | |
2829 | } | |
2830 | #endif /* DOETXACK */ | |
2831 | ||
2832 | if (hashmark) { | |
2833 | putchar_unfiltered ('#'); | |
2834 | gdb_flush (gdb_stdout); | |
2835 | } | |
2836 | ||
2837 | bp = buffer; | |
2838 | reclen = 0; /* buffer processed */ | |
2839 | } | |
2840 | } | |
2841 | } | |
2842 | ||
2843 | /* Ensure no out-standing zerofill requests: */ | |
2844 | if (zerofill != 0) | |
2845 | reclen = pmon_zeroset (reclen, &bp, &zerofill, &csum); | |
2846 | ||
2847 | /* and then flush the line: */ | |
2848 | if (reclen > 0) { | |
2849 | reclen = pmon_checkset (reclen, &bp, &csum); | |
2850 | /* Currently pmon_checkset outputs the line terminator by | |
2851 | default, so we write out the buffer so far: */ | |
2852 | SERIAL_WRITE (mips_desc, buffer, reclen); | |
2853 | #if defined(DOETXACK) | |
2854 | finished = pmon_check_ack(); | |
2855 | #endif /* DOETXACK */ | |
2856 | } | |
2857 | } | |
2858 | ||
2859 | if (hashmark) | |
2860 | putchar_unfiltered ('\n'); | |
2861 | } | |
2862 | ||
2863 | /* Terminate the transfer. We know that we have an empty output | |
2864 | buffer at this point. */ | |
2865 | sprintf (buffer, "/E/E\015"); /* include dummy padding characters */ | |
2866 | reclen = strlen (buffer); | |
2867 | SERIAL_WRITE (mips_desc, buffer, reclen); | |
2868 | ||
2869 | if (finished) { /* Ignore the termination message: */ | |
2870 | SERIAL_FLUSH_INPUT (mips_desc); | |
2871 | } else { /* Deal with termination message: */ | |
2872 | char hexnumber[9]; /* includes '\0' space */ | |
2873 | mips_expect ("Entry Address = "); | |
2874 | sprintf(hexnumber,"%x",final); | |
2875 | mips_expect (hexnumber); | |
2876 | #if defined(DOETXACK) | |
2877 | mips_expect ("\015\012\006\015\012total = 0x"); | |
2878 | #else /* normal termination */ | |
2879 | mips_expect ("\015\012\015\012total = 0x"); | |
2880 | #endif /* !DOETXACK */ | |
2881 | sprintf(hexnumber,"%x",bintotal); | |
2882 | mips_expect (hexnumber); | |
2883 | mips_expect (" bytes\015\012"); | |
2884 | } | |
2885 | ||
2886 | return; | |
2887 | } | |
2888 | ||
4704fd9c SG |
2889 | /* mips_load -- download a file. */ |
2890 | ||
2891 | static void | |
2892 | mips_load (file, from_tty) | |
2893 | char *file; | |
2894 | int from_tty; | |
2895 | { | |
4704fd9c | 2896 | /* Get the board out of remote debugging mode. */ |
090d784a | 2897 | if (mips_exit_debug ()) |
4704fd9c SG |
2898 | error ("mips_load: Couldn't get into monitor mode."); |
2899 | ||
5dad8312 | 2900 | if (mips_monitor == MON_PMON || mips_monitor == MON_DDB) |
090d784a JSC |
2901 | pmon_load_fast (file); |
2902 | else | |
2903 | mips_load_srec (file); | |
4704fd9c | 2904 | |
4704fd9c SG |
2905 | mips_initialize (); |
2906 | ||
aeb8f981 | 2907 | /* Finally, make the PC point at the start address */ |
5dad8312 | 2908 | if (mips_monitor == MON_DDB) |
aeb8f981 | 2909 | { |
5dad8312 | 2910 | /* Work around problem where DDB monitor does not update the |
aeb8f981 JSC |
2911 | PC after a load. The following ensures that the write_pc() |
2912 | WILL update the PC value: */ | |
2913 | register_valid[PC_REGNUM] = 0; | |
2914 | } | |
4704fd9c SG |
2915 | if (exec_bfd) |
2916 | write_pc (bfd_get_start_address (exec_bfd)); | |
2917 | ||
2918 | inferior_pid = 0; /* No process now */ | |
2919 | ||
2920 | /* This is necessary because many things were based on the PC at the time that | |
2921 | we attached to the monitor, which is no longer valid now that we have loaded | |
2922 | new code (and just changed the PC). Another way to do this might be to call | |
2923 | normal_stop, except that the stack may not be valid, and things would get | |
2924 | horribly confused... */ | |
2925 | ||
2926 | clear_symtab_users (); | |
2927 | } | |
aa56c716 | 2928 | \f |
33742334 ILT |
2929 | /* The target vector. */ |
2930 | ||
2931 | struct target_ops mips_ops = | |
2932 | { | |
2933 | "mips", /* to_shortname */ | |
2934 | "Remote MIPS debugging over serial line", /* to_longname */ | |
796d1fd3 JK |
2935 | "\ |
2936 | Debug a board using the MIPS remote debugging protocol over a serial line.\n\ | |
2937 | The argument is the device it is connected to or, if it contains a colon,\n\ | |
2938 | HOST:PORT to access a board over a network", /* to_doc */ | |
33742334 ILT |
2939 | mips_open, /* to_open */ |
2940 | mips_close, /* to_close */ | |
2941 | NULL, /* to_attach */ | |
2942 | mips_detach, /* to_detach */ | |
2943 | mips_resume, /* to_resume */ | |
2944 | mips_wait, /* to_wait */ | |
2945 | mips_fetch_registers, /* to_fetch_registers */ | |
2946 | mips_store_registers, /* to_store_registers */ | |
2947 | mips_prepare_to_store, /* to_prepare_to_store */ | |
2948 | mips_xfer_memory, /* to_xfer_memory */ | |
2949 | mips_files_info, /* to_files_info */ | |
aa56c716 JK |
2950 | mips_insert_breakpoint, /* to_insert_breakpoint */ |
2951 | mips_remove_breakpoint, /* to_remove_breakpoint */ | |
33742334 ILT |
2952 | NULL, /* to_terminal_init */ |
2953 | NULL, /* to_terminal_inferior */ | |
2954 | NULL, /* to_terminal_ours_for_output */ | |
2955 | NULL, /* to_terminal_ours */ | |
2956 | NULL, /* to_terminal_info */ | |
c2a0f1cb | 2957 | mips_kill, /* to_kill */ |
4704fd9c | 2958 | mips_load, /* to_load */ |
33742334 ILT |
2959 | NULL, /* to_lookup_symbol */ |
2960 | mips_create_inferior, /* to_create_inferior */ | |
2961 | mips_mourn_inferior, /* to_mourn_inferior */ | |
2962 | NULL, /* to_can_run */ | |
2963 | NULL, /* to_notice_signals */ | |
43fc25c8 | 2964 | 0, /* to_thread_alive */ |
78b459a7 | 2965 | 0, /* to_stop */ |
33742334 ILT |
2966 | process_stratum, /* to_stratum */ |
2967 | NULL, /* to_next */ | |
2968 | 1, /* to_has_all_memory */ | |
2969 | 1, /* to_has_memory */ | |
2970 | 1, /* to_has_stack */ | |
2971 | 1, /* to_has_registers */ | |
2972 | 1, /* to_has_execution */ | |
2973 | NULL, /* sections */ | |
2974 | NULL, /* sections_end */ | |
2975 | OPS_MAGIC /* to_magic */ | |
2976 | }; | |
2977 | \f | |
090d784a JSC |
2978 | /* An alternative target vector: */ |
2979 | struct target_ops pmon_ops = | |
2980 | { | |
2981 | "pmon", /* to_shortname */ | |
2982 | "Remote MIPS debugging over serial line", /* to_longname */ | |
2983 | "\ | |
5dad8312 SS |
2984 | Debug a board using the PMON MIPS remote debugging protocol over a serial line.\n\ |
2985 | The argument is the device it is connected to or, if it contains a\n\ | |
090d784a JSC |
2986 | colon, HOST:PORT to access a board over a network", /* to_doc */ |
2987 | pmon_open, /* to_open */ | |
2988 | mips_close, /* to_close */ | |
2989 | NULL, /* to_attach */ | |
2990 | mips_detach, /* to_detach */ | |
2991 | mips_resume, /* to_resume */ | |
2992 | pmon_wait, /* to_wait */ | |
2993 | mips_fetch_registers, /* to_fetch_registers */ | |
2994 | mips_store_registers, /* to_store_registers */ | |
2995 | mips_prepare_to_store, /* to_prepare_to_store */ | |
2996 | mips_xfer_memory, /* to_xfer_memory */ | |
2997 | mips_files_info, /* to_files_info */ | |
2998 | mips_insert_breakpoint, /* to_insert_breakpoint */ | |
2999 | mips_remove_breakpoint, /* to_remove_breakpoint */ | |
3000 | NULL, /* to_terminal_init */ | |
3001 | NULL, /* to_terminal_inferior */ | |
3002 | NULL, /* to_terminal_ours_for_output */ | |
3003 | NULL, /* to_terminal_ours */ | |
3004 | NULL, /* to_terminal_info */ | |
3005 | mips_kill, /* to_kill */ | |
3006 | mips_load, /* to_load */ | |
3007 | NULL, /* to_lookup_symbol */ | |
3008 | mips_create_inferior, /* to_create_inferior */ | |
3009 | mips_mourn_inferior, /* to_mourn_inferior */ | |
3010 | NULL, /* to_can_run */ | |
3011 | NULL, /* to_notice_signals */ | |
3012 | 0, /* to_thread_alive */ | |
3013 | 0, /* to_stop */ | |
3014 | process_stratum, /* to_stratum */ | |
3015 | NULL, /* to_next */ | |
3016 | 1, /* to_has_all_memory */ | |
3017 | 1, /* to_has_memory */ | |
3018 | 1, /* to_has_stack */ | |
3019 | 1, /* to_has_registers */ | |
3020 | 1, /* to_has_execution */ | |
3021 | NULL, /* sections */ | |
3022 | NULL, /* sections_end */ | |
3023 | OPS_MAGIC /* to_magic */ | |
3024 | }; | |
3025 | \f | |
51328506 JSC |
3026 | /* Another alternative target vector. This is a PMON system, but with |
3027 | a different monitor prompt, aswell as some other operational | |
3028 | differences: */ | |
5dad8312 | 3029 | struct target_ops ddb_ops = |
51328506 | 3030 | { |
5dad8312 | 3031 | "ddb", /* to_shortname */ |
51328506 JSC |
3032 | "Remote MIPS debugging over serial line", /* to_longname */ |
3033 | "\ | |
5dad8312 SS |
3034 | Debug a board using the DDBVR4300 (PMON) MIPS remote debugging protocol over a serial line.\n\ |
3035 | The argument is the device it is connected to or, if it contains a\n\ | |
51328506 | 3036 | colon, HOST:PORT to access a board over a network", /* to_doc */ |
5dad8312 | 3037 | ddb_open, /* to_open */ |
51328506 JSC |
3038 | mips_close, /* to_close */ |
3039 | NULL, /* to_attach */ | |
3040 | mips_detach, /* to_detach */ | |
3041 | mips_resume, /* to_resume */ | |
3042 | pmon_wait, /* to_wait */ | |
3043 | mips_fetch_registers, /* to_fetch_registers */ | |
3044 | mips_store_registers, /* to_store_registers */ | |
3045 | mips_prepare_to_store, /* to_prepare_to_store */ | |
3046 | mips_xfer_memory, /* to_xfer_memory */ | |
3047 | mips_files_info, /* to_files_info */ | |
3048 | mips_insert_breakpoint, /* to_insert_breakpoint */ | |
3049 | mips_remove_breakpoint, /* to_remove_breakpoint */ | |
3050 | NULL, /* to_terminal_init */ | |
3051 | NULL, /* to_terminal_inferior */ | |
3052 | NULL, /* to_terminal_ours_for_output */ | |
3053 | NULL, /* to_terminal_ours */ | |
3054 | NULL, /* to_terminal_info */ | |
3055 | mips_kill, /* to_kill */ | |
3056 | mips_load, /* to_load */ | |
3057 | NULL, /* to_lookup_symbol */ | |
3058 | mips_create_inferior, /* to_create_inferior */ | |
3059 | mips_mourn_inferior, /* to_mourn_inferior */ | |
3060 | NULL, /* to_can_run */ | |
3061 | NULL, /* to_notice_signals */ | |
3062 | 0, /* to_thread_alive */ | |
3063 | 0, /* to_stop */ | |
3064 | process_stratum, /* to_stratum */ | |
3065 | NULL, /* to_next */ | |
3066 | 1, /* to_has_all_memory */ | |
3067 | 1, /* to_has_memory */ | |
3068 | 1, /* to_has_stack */ | |
3069 | 1, /* to_has_registers */ | |
3070 | 1, /* to_has_execution */ | |
3071 | NULL, /* sections */ | |
3072 | NULL, /* sections_end */ | |
3073 | OPS_MAGIC /* to_magic */ | |
3074 | }; | |
3075 | \f | |
33742334 ILT |
3076 | void |
3077 | _initialize_remote_mips () | |
3078 | { | |
3079 | add_target (&mips_ops); | |
090d784a | 3080 | add_target (&pmon_ops); |
5dad8312 | 3081 | add_target (&ddb_ops); |
33742334 | 3082 | |
0907dc09 ILT |
3083 | add_show_from_set ( |
3084 | add_set_cmd ("timeout", no_class, var_zinteger, | |
3085 | (char *) &mips_receive_wait, | |
3086 | "Set timeout in seconds for remote MIPS serial I/O.", | |
3087 | &setlist), | |
3088 | &showlist); | |
3089 | ||
3090 | add_show_from_set ( | |
3091 | add_set_cmd ("retransmit-timeout", no_class, var_zinteger, | |
3092 | (char *) &mips_retransmit_wait, | |
3093 | "Set retransmit timeout in seconds for remote MIPS serial I/O.\n\ | |
3094 | This is the number of seconds to wait for an acknowledgement to a packet\n\ | |
3095 | before resending the packet.", &setlist), | |
3096 | &showlist); | |
4c5bc9f4 SG |
3097 | |
3098 | add_show_from_set ( | |
3099 | add_set_cmd ("syn-garbage-limit", no_class, var_zinteger, | |
3100 | (char *) &mips_syn_garbage, | |
3101 | "Set the maximum number of characters to ignore when scanning for a SYN.\n\ | |
3102 | This is the maximum number of characters GDB will ignore when trying to\n\ | |
3103 | synchronize with the remote system. A value of -1 means that there is no limit\n\ | |
3104 | (Note that these characters are printed out even though they are ignored.)", | |
3105 | &setlist), | |
3106 | &showlist); | |
33742334 | 3107 | } |