]>
Commit | Line | Data |
---|---|---|
b920de1b DH |
1 | /* MN10300 GDB stub |
2 | * | |
3 | * Originally written by Glenn Engel, Lake Stevens Instrument Division | |
4 | * | |
5 | * Contributed by HP Systems | |
6 | * | |
7 | * Modified for SPARC by Stu Grossman, Cygnus Support. | |
8 | * | |
9 | * Modified for Linux/MIPS (and MIPS in general) by Andreas Busse | |
10 | * Send complaints, suggestions etc. to <andy@waldorf-gmbh.de> | |
11 | * | |
12 | * Copyright (C) 1995 Andreas Busse | |
13 | * | |
14 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
15 | * Modified for Linux/mn10300 by David Howells <dhowells@redhat.com> | |
16 | */ | |
17 | ||
18 | /* | |
19 | * To enable debugger support, two things need to happen. One, a | |
20 | * call to set_debug_traps() is necessary in order to allow any breakpoints | |
21 | * or error conditions to be properly intercepted and reported to gdb. | |
22 | * Two, a breakpoint needs to be generated to begin communication. This | |
23 | * is most easily accomplished by a call to breakpoint(). Breakpoint() | |
24 | * simulates a breakpoint by executing a BREAK instruction. | |
25 | * | |
26 | * | |
27 | * The following gdb commands are supported: | |
28 | * | |
29 | * command function Return value | |
30 | * | |
31 | * g return the value of the CPU registers hex data or ENN | |
32 | * G set the value of the CPU registers OK or ENN | |
33 | * | |
34 | * mAA..AA,LLLL Read LLLL bytes at address AA..AA hex data or ENN | |
35 | * MAA..AA,LLLL: Write LLLL bytes at address AA.AA OK or ENN | |
36 | * | |
37 | * c Resume at current address SNN ( signal NN) | |
38 | * cAA..AA Continue at address AA..AA SNN | |
39 | * | |
40 | * s Step one instruction SNN | |
41 | * sAA..AA Step one instruction from AA..AA SNN | |
42 | * | |
43 | * k kill | |
44 | * | |
45 | * ? What was the last sigval ? SNN (signal NN) | |
46 | * | |
47 | * bBB..BB Set baud rate to BB..BB OK or BNN, then sets | |
48 | * baud rate | |
49 | * | |
50 | * All commands and responses are sent with a packet which includes a | |
51 | * checksum. A packet consists of | |
52 | * | |
53 | * $<packet info>#<checksum>. | |
54 | * | |
55 | * where | |
56 | * <packet info> :: <characters representing the command or response> | |
57 | * <checksum> :: < two hex digits computed as modulo 256 sum of <packetinfo>> | |
58 | * | |
59 | * When a packet is received, it is first acknowledged with either '+' or '-'. | |
60 | * '+' indicates a successful transfer. '-' indicates a failed transfer. | |
61 | * | |
62 | * Example: | |
63 | * | |
64 | * Host: Reply: | |
65 | * $m0,10#2a +$00010203040506070809101112131415#42 | |
66 | * | |
67 | * | |
68 | * ============== | |
69 | * MORE EXAMPLES: | |
70 | * ============== | |
71 | * | |
72 | * For reference -- the following are the steps that one | |
73 | * company took (RidgeRun Inc) to get remote gdb debugging | |
74 | * going. In this scenario the host machine was a PC and the | |
75 | * target platform was a Galileo EVB64120A MIPS evaluation | |
76 | * board. | |
77 | * | |
78 | * Step 1: | |
79 | * First download gdb-5.0.tar.gz from the internet. | |
80 | * and then build/install the package. | |
81 | * | |
82 | * Example: | |
83 | * $ tar zxf gdb-5.0.tar.gz | |
84 | * $ cd gdb-5.0 | |
85 | * $ ./configure --target=am33_2.0-linux-gnu | |
86 | * $ make | |
87 | * $ install | |
88 | * am33_2.0-linux-gnu-gdb | |
89 | * | |
90 | * Step 2: | |
91 | * Configure linux for remote debugging and build it. | |
92 | * | |
93 | * Example: | |
94 | * $ cd ~/linux | |
95 | * $ make menuconfig <go to "Kernel Hacking" and turn on remote debugging> | |
96 | * $ make dep; make vmlinux | |
97 | * | |
98 | * Step 3: | |
99 | * Download the kernel to the remote target and start | |
100 | * the kernel running. It will promptly halt and wait | |
101 | * for the host gdb session to connect. It does this | |
102 | * since the "Kernel Hacking" option has defined | |
103 | * CONFIG_REMOTE_DEBUG which in turn enables your calls | |
104 | * to: | |
105 | * set_debug_traps(); | |
106 | * breakpoint(); | |
107 | * | |
108 | * Step 4: | |
109 | * Start the gdb session on the host. | |
110 | * | |
111 | * Example: | |
112 | * $ am33_2.0-linux-gnu-gdb vmlinux | |
113 | * (gdb) set remotebaud 115200 | |
114 | * (gdb) target remote /dev/ttyS1 | |
115 | * ...at this point you are connected to | |
116 | * the remote target and can use gdb | |
117 | * in the normal fasion. Setting | |
118 | * breakpoints, single stepping, | |
119 | * printing variables, etc. | |
120 | * | |
121 | */ | |
122 | ||
123 | #include <linux/string.h> | |
124 | #include <linux/kernel.h> | |
125 | #include <linux/signal.h> | |
126 | #include <linux/sched.h> | |
127 | #include <linux/mm.h> | |
128 | #include <linux/console.h> | |
129 | #include <linux/init.h> | |
130 | #include <linux/bug.h> | |
131 | ||
132 | #include <asm/pgtable.h> | |
133 | #include <asm/system.h> | |
134 | #include <asm/gdb-stub.h> | |
135 | #include <asm/exceptions.h> | |
136 | #include <asm/cacheflush.h> | |
137 | #include <asm/serial-regs.h> | |
138 | #include <asm/busctl-regs.h> | |
139 | #include <asm/unit/leds.h> | |
140 | #include <asm/unit/serial.h> | |
141 | ||
142 | /* define to use F7F7 rather than FF which is subverted by JTAG debugger */ | |
143 | #undef GDBSTUB_USE_F7F7_AS_BREAKPOINT | |
144 | ||
145 | /* | |
146 | * BUFMAX defines the maximum number of characters in inbound/outbound buffers | |
147 | * at least NUMREGBYTES*2 are needed for register packets | |
148 | */ | |
149 | #define BUFMAX 2048 | |
150 | ||
151 | static const char gdbstub_banner[] = | |
152 | "Linux/MN10300 GDB Stub (c) RedHat 2007\n"; | |
153 | ||
154 | u8 gdbstub_rx_buffer[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE))); | |
155 | u32 gdbstub_rx_inp; | |
156 | u32 gdbstub_rx_outp; | |
157 | u8 gdbstub_busy; | |
158 | u8 gdbstub_rx_overflow; | |
159 | u8 gdbstub_rx_unget; | |
160 | ||
161 | static u8 gdbstub_flush_caches; | |
162 | static char input_buffer[BUFMAX]; | |
163 | static char output_buffer[BUFMAX]; | |
164 | static char trans_buffer[BUFMAX]; | |
165 | ||
b920de1b DH |
166 | struct gdbstub_bkpt { |
167 | u8 *addr; /* address of breakpoint */ | |
168 | u8 len; /* size of breakpoint */ | |
169 | u8 origbytes[7]; /* original bytes */ | |
170 | }; | |
171 | ||
172 | static struct gdbstub_bkpt gdbstub_bkpts[256]; | |
173 | ||
174 | /* | |
175 | * local prototypes | |
176 | */ | |
177 | static void getpacket(char *buffer); | |
178 | static int putpacket(char *buffer); | |
179 | static int computeSignal(enum exception_code excep); | |
180 | static int hex(unsigned char ch); | |
181 | static int hexToInt(char **ptr, int *intValue); | |
182 | static unsigned char *mem2hex(const void *mem, char *buf, int count, | |
183 | int may_fault); | |
184 | static const char *hex2mem(const char *buf, void *_mem, int count, | |
185 | int may_fault); | |
186 | ||
187 | /* | |
188 | * Convert ch from a hex digit to an int | |
189 | */ | |
190 | static int hex(unsigned char ch) | |
191 | { | |
192 | if (ch >= 'a' && ch <= 'f') | |
193 | return ch - 'a' + 10; | |
194 | if (ch >= '0' && ch <= '9') | |
195 | return ch - '0'; | |
196 | if (ch >= 'A' && ch <= 'F') | |
197 | return ch - 'A' + 10; | |
198 | return -1; | |
199 | } | |
200 | ||
201 | #ifdef CONFIG_GDBSTUB_DEBUGGING | |
202 | ||
203 | void debug_to_serial(const char *p, int n) | |
204 | { | |
205 | __debug_to_serial(p, n); | |
206 | /* gdbstub_console_write(NULL, p, n); */ | |
207 | } | |
208 | ||
209 | void gdbstub_printk(const char *fmt, ...) | |
210 | { | |
211 | va_list args; | |
212 | int len; | |
213 | ||
214 | /* Emit the output into the temporary buffer */ | |
215 | va_start(args, fmt); | |
216 | len = vsnprintf(trans_buffer, sizeof(trans_buffer), fmt, args); | |
217 | va_end(args); | |
218 | debug_to_serial(trans_buffer, len); | |
219 | } | |
220 | ||
221 | #endif | |
222 | ||
223 | static inline char *gdbstub_strcpy(char *dst, const char *src) | |
224 | { | |
225 | int loop = 0; | |
226 | while ((dst[loop] = src[loop])) | |
227 | loop++; | |
228 | return dst; | |
229 | } | |
230 | ||
231 | /* | |
232 | * scan for the sequence $<data>#<checksum> | |
233 | */ | |
234 | static void getpacket(char *buffer) | |
235 | { | |
236 | unsigned char checksum; | |
237 | unsigned char xmitcsum; | |
238 | unsigned char ch; | |
239 | int count, i, ret, error; | |
240 | ||
241 | for (;;) { | |
242 | /* | |
243 | * wait around for the start character, | |
244 | * ignore all other characters | |
245 | */ | |
246 | do { | |
247 | gdbstub_io_rx_char(&ch, 0); | |
248 | } while (ch != '$'); | |
249 | ||
250 | checksum = 0; | |
251 | xmitcsum = -1; | |
252 | count = 0; | |
253 | error = 0; | |
254 | ||
255 | /* | |
256 | * now, read until a # or end of buffer is found | |
257 | */ | |
258 | while (count < BUFMAX) { | |
259 | ret = gdbstub_io_rx_char(&ch, 0); | |
260 | if (ret < 0) | |
261 | error = ret; | |
262 | ||
263 | if (ch == '#') | |
264 | break; | |
265 | checksum += ch; | |
266 | buffer[count] = ch; | |
267 | count++; | |
268 | } | |
269 | ||
270 | if (error == -EIO) { | |
271 | gdbstub_proto("### GDB Rx Error - Skipping packet" | |
272 | " ###\n"); | |
273 | gdbstub_proto("### GDB Tx NAK\n"); | |
274 | gdbstub_io_tx_char('-'); | |
275 | continue; | |
276 | } | |
277 | ||
278 | if (count >= BUFMAX || error) | |
279 | continue; | |
280 | ||
281 | buffer[count] = 0; | |
282 | ||
283 | /* read the checksum */ | |
284 | ret = gdbstub_io_rx_char(&ch, 0); | |
285 | if (ret < 0) | |
286 | error = ret; | |
287 | xmitcsum = hex(ch) << 4; | |
288 | ||
289 | ret = gdbstub_io_rx_char(&ch, 0); | |
290 | if (ret < 0) | |
291 | error = ret; | |
292 | xmitcsum |= hex(ch); | |
293 | ||
294 | if (error) { | |
295 | if (error == -EIO) | |
296 | gdbstub_io("### GDB Rx Error -" | |
297 | " Skipping packet\n"); | |
298 | gdbstub_io("### GDB Tx NAK\n"); | |
299 | gdbstub_io_tx_char('-'); | |
300 | continue; | |
301 | } | |
302 | ||
303 | /* check the checksum */ | |
304 | if (checksum != xmitcsum) { | |
305 | gdbstub_io("### GDB Tx NAK\n"); | |
306 | gdbstub_io_tx_char('-'); /* failed checksum */ | |
307 | continue; | |
308 | } | |
309 | ||
310 | gdbstub_proto("### GDB Rx '$%s#%02x' ###\n", buffer, checksum); | |
311 | gdbstub_io("### GDB Tx ACK\n"); | |
312 | gdbstub_io_tx_char('+'); /* successful transfer */ | |
313 | ||
314 | /* | |
315 | * if a sequence char is present, | |
316 | * reply the sequence ID | |
317 | */ | |
318 | if (buffer[2] == ':') { | |
319 | gdbstub_io_tx_char(buffer[0]); | |
320 | gdbstub_io_tx_char(buffer[1]); | |
321 | ||
322 | /* | |
323 | * remove sequence chars from buffer | |
324 | */ | |
325 | count = 0; | |
326 | while (buffer[count]) | |
327 | count++; | |
328 | for (i = 3; i <= count; i++) | |
329 | buffer[i - 3] = buffer[i]; | |
330 | } | |
331 | ||
332 | break; | |
333 | } | |
334 | } | |
335 | ||
336 | /* | |
337 | * send the packet in buffer. | |
338 | * - return 0 if successfully ACK'd | |
339 | * - return 1 if abandoned due to new incoming packet | |
340 | */ | |
341 | static int putpacket(char *buffer) | |
342 | { | |
343 | unsigned char checksum; | |
344 | unsigned char ch; | |
345 | int count; | |
346 | ||
347 | /* | |
348 | * $<packet info>#<checksum>. | |
349 | */ | |
350 | gdbstub_proto("### GDB Tx $'%s'#?? ###\n", buffer); | |
351 | ||
352 | do { | |
353 | gdbstub_io_tx_char('$'); | |
354 | checksum = 0; | |
355 | count = 0; | |
356 | ||
357 | while ((ch = buffer[count]) != 0) { | |
358 | gdbstub_io_tx_char(ch); | |
359 | checksum += ch; | |
360 | count += 1; | |
361 | } | |
362 | ||
363 | gdbstub_io_tx_char('#'); | |
26824972 HH |
364 | gdbstub_io_tx_char(hex_asc_hi(checksum)); |
365 | gdbstub_io_tx_char(hex_asc_lo(checksum)); | |
b920de1b DH |
366 | |
367 | } while (gdbstub_io_rx_char(&ch, 0), | |
368 | ch == '-' && (gdbstub_io("### GDB Rx NAK\n"), 0), | |
369 | ch != '-' && ch != '+' && | |
370 | (gdbstub_io("### GDB Rx ??? %02x\n", ch), 0), | |
371 | ch != '+' && ch != '$'); | |
372 | ||
373 | if (ch == '+') { | |
374 | gdbstub_io("### GDB Rx ACK\n"); | |
375 | return 0; | |
376 | } | |
377 | ||
378 | gdbstub_io("### GDB Tx Abandoned\n"); | |
379 | gdbstub_rx_unget = ch; | |
380 | return 1; | |
381 | } | |
382 | ||
383 | /* | |
384 | * While we find nice hex chars, build an int. | |
385 | * Return number of chars processed. | |
386 | */ | |
387 | static int hexToInt(char **ptr, int *intValue) | |
388 | { | |
389 | int numChars = 0; | |
390 | int hexValue; | |
391 | ||
392 | *intValue = 0; | |
393 | ||
394 | while (**ptr) { | |
395 | hexValue = hex(**ptr); | |
396 | if (hexValue < 0) | |
397 | break; | |
398 | ||
399 | *intValue = (*intValue << 4) | hexValue; | |
400 | numChars++; | |
401 | ||
402 | (*ptr)++; | |
403 | } | |
404 | ||
405 | return (numChars); | |
406 | } | |
407 | ||
408 | /* | |
409 | * We single-step by setting breakpoints. When an exception | |
410 | * is handled, we need to restore the instructions hoisted | |
411 | * when the breakpoints were set. | |
412 | * | |
413 | * This is where we save the original instructions. | |
414 | */ | |
415 | static struct gdb_bp_save { | |
416 | u8 *addr; | |
417 | u8 opcode[2]; | |
418 | } step_bp[2]; | |
419 | ||
420 | static const unsigned char gdbstub_insn_sizes[256] = | |
421 | { | |
422 | /* 1 2 3 4 5 6 7 8 9 a b c d e f */ | |
423 | 1, 3, 3, 3, 1, 3, 3, 3, 1, 3, 3, 3, 1, 3, 3, 3, /* 0 */ | |
424 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 1 */ | |
425 | 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, /* 2 */ | |
426 | 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, /* 3 */ | |
427 | 1, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2, /* 4 */ | |
428 | 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, /* 5 */ | |
429 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 6 */ | |
430 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 7 */ | |
431 | 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, /* 8 */ | |
432 | 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, /* 9 */ | |
433 | 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, /* a */ | |
434 | 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, /* b */ | |
435 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 2, 2, /* c */ | |
436 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* d */ | |
437 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* e */ | |
438 | 0, 2, 2, 2, 2, 2, 2, 4, 0, 3, 0, 4, 0, 6, 7, 1 /* f */ | |
439 | }; | |
440 | ||
441 | static int __gdbstub_mark_bp(u8 *addr, int ix) | |
442 | { | |
443 | if (addr < (u8 *) 0x70000000UL) | |
444 | return 0; | |
445 | /* 70000000-7fffffff: vmalloc area */ | |
446 | if (addr < (u8 *) 0x80000000UL) | |
447 | goto okay; | |
448 | if (addr < (u8 *) 0x8c000000UL) | |
449 | return 0; | |
450 | /* 8c000000-93ffffff: SRAM, SDRAM */ | |
451 | if (addr < (u8 *) 0x94000000UL) | |
452 | goto okay; | |
453 | return 0; | |
454 | ||
455 | okay: | |
456 | if (gdbstub_read_byte(addr + 0, &step_bp[ix].opcode[0]) < 0 || | |
457 | gdbstub_read_byte(addr + 1, &step_bp[ix].opcode[1]) < 0) | |
458 | return 0; | |
459 | ||
460 | step_bp[ix].addr = addr; | |
461 | return 1; | |
462 | } | |
463 | ||
464 | static inline void __gdbstub_restore_bp(void) | |
465 | { | |
466 | #ifdef GDBSTUB_USE_F7F7_AS_BREAKPOINT | |
467 | if (step_bp[0].addr) { | |
468 | gdbstub_write_byte(step_bp[0].opcode[0], step_bp[0].addr + 0); | |
469 | gdbstub_write_byte(step_bp[0].opcode[1], step_bp[0].addr + 1); | |
470 | } | |
471 | if (step_bp[1].addr) { | |
472 | gdbstub_write_byte(step_bp[1].opcode[0], step_bp[1].addr + 0); | |
473 | gdbstub_write_byte(step_bp[1].opcode[1], step_bp[1].addr + 1); | |
474 | } | |
475 | #else | |
476 | if (step_bp[0].addr) | |
477 | gdbstub_write_byte(step_bp[0].opcode[0], step_bp[0].addr + 0); | |
478 | if (step_bp[1].addr) | |
479 | gdbstub_write_byte(step_bp[1].opcode[0], step_bp[1].addr + 0); | |
480 | #endif | |
481 | ||
482 | gdbstub_flush_caches = 1; | |
483 | ||
484 | step_bp[0].addr = NULL; | |
485 | step_bp[0].opcode[0] = 0; | |
486 | step_bp[0].opcode[1] = 0; | |
487 | step_bp[1].addr = NULL; | |
488 | step_bp[1].opcode[0] = 0; | |
489 | step_bp[1].opcode[1] = 0; | |
490 | } | |
491 | ||
492 | /* | |
493 | * emulate single stepping by means of breakpoint instructions | |
494 | */ | |
495 | static int gdbstub_single_step(struct pt_regs *regs) | |
496 | { | |
497 | unsigned size; | |
498 | uint32_t x; | |
499 | uint8_t cur, *pc, *sp; | |
500 | ||
501 | step_bp[0].addr = NULL; | |
502 | step_bp[0].opcode[0] = 0; | |
503 | step_bp[0].opcode[1] = 0; | |
504 | step_bp[1].addr = NULL; | |
505 | step_bp[1].opcode[0] = 0; | |
506 | step_bp[1].opcode[1] = 0; | |
507 | x = 0; | |
508 | ||
509 | pc = (u8 *) regs->pc; | |
510 | sp = (u8 *) (regs + 1); | |
511 | if (gdbstub_read_byte(pc, &cur) < 0) | |
512 | return -EFAULT; | |
513 | ||
514 | gdbstub_bkpt("Single Step from %p { %02x }\n", pc, cur); | |
515 | ||
516 | gdbstub_flush_caches = 1; | |
517 | ||
518 | size = gdbstub_insn_sizes[cur]; | |
519 | if (size > 0) { | |
520 | if (!__gdbstub_mark_bp(pc + size, 0)) | |
521 | goto fault; | |
522 | } else { | |
523 | switch (cur) { | |
524 | /* Bxx (d8,PC) */ | |
525 | case 0xc0: | |
526 | case 0xc1: | |
527 | case 0xc2: | |
528 | case 0xc3: | |
529 | case 0xc4: | |
530 | case 0xc5: | |
531 | case 0xc6: | |
532 | case 0xc7: | |
533 | case 0xc8: | |
534 | case 0xc9: | |
535 | case 0xca: | |
536 | if (gdbstub_read_byte(pc + 1, (u8 *) &x) < 0) | |
537 | goto fault; | |
538 | if (!__gdbstub_mark_bp(pc + 2, 0)) | |
539 | goto fault; | |
540 | if ((x < 0 || x > 2) && | |
541 | !__gdbstub_mark_bp(pc + (s8) x, 1)) | |
542 | goto fault; | |
543 | break; | |
544 | ||
545 | /* LXX (d8,PC) */ | |
546 | case 0xd0: | |
547 | case 0xd1: | |
548 | case 0xd2: | |
549 | case 0xd3: | |
550 | case 0xd4: | |
551 | case 0xd5: | |
552 | case 0xd6: | |
553 | case 0xd7: | |
554 | case 0xd8: | |
555 | case 0xd9: | |
556 | case 0xda: | |
557 | if (!__gdbstub_mark_bp(pc + 1, 0)) | |
558 | goto fault; | |
559 | if (regs->pc != regs->lar && | |
560 | !__gdbstub_mark_bp((u8 *) regs->lar, 1)) | |
561 | goto fault; | |
562 | break; | |
563 | ||
564 | /* SETLB - loads the next for bytes into the LIR | |
565 | * register */ | |
566 | case 0xdb: | |
567 | if (!__gdbstub_mark_bp(pc + 1, 0)) | |
568 | goto fault; | |
569 | break; | |
570 | ||
571 | /* JMP (d16,PC) or CALL (d16,PC) */ | |
572 | case 0xcc: | |
573 | case 0xcd: | |
574 | if (gdbstub_read_byte(pc + 1, ((u8 *) &x) + 0) < 0 || | |
575 | gdbstub_read_byte(pc + 2, ((u8 *) &x) + 1) < 0) | |
576 | goto fault; | |
577 | if (!__gdbstub_mark_bp(pc + (s16) x, 0)) | |
578 | goto fault; | |
579 | break; | |
580 | ||
581 | /* JMP (d32,PC) or CALL (d32,PC) */ | |
582 | case 0xdc: | |
583 | case 0xdd: | |
584 | if (gdbstub_read_byte(pc + 1, ((u8 *) &x) + 0) < 0 || | |
585 | gdbstub_read_byte(pc + 2, ((u8 *) &x) + 1) < 0 || | |
586 | gdbstub_read_byte(pc + 3, ((u8 *) &x) + 2) < 0 || | |
587 | gdbstub_read_byte(pc + 4, ((u8 *) &x) + 3) < 0) | |
588 | goto fault; | |
589 | if (!__gdbstub_mark_bp(pc + (s32) x, 0)) | |
590 | goto fault; | |
591 | break; | |
592 | ||
593 | /* RETF */ | |
594 | case 0xde: | |
595 | if (!__gdbstub_mark_bp((u8 *) regs->mdr, 0)) | |
596 | goto fault; | |
597 | break; | |
598 | ||
599 | /* RET */ | |
600 | case 0xdf: | |
601 | if (gdbstub_read_byte(pc + 2, (u8 *) &x) < 0) | |
602 | goto fault; | |
603 | sp += (s8)x; | |
604 | if (gdbstub_read_byte(sp + 0, ((u8 *) &x) + 0) < 0 || | |
605 | gdbstub_read_byte(sp + 1, ((u8 *) &x) + 1) < 0 || | |
606 | gdbstub_read_byte(sp + 2, ((u8 *) &x) + 2) < 0 || | |
607 | gdbstub_read_byte(sp + 3, ((u8 *) &x) + 3) < 0) | |
608 | goto fault; | |
609 | if (!__gdbstub_mark_bp((u8 *) x, 0)) | |
610 | goto fault; | |
611 | break; | |
612 | ||
613 | case 0xf0: | |
614 | if (gdbstub_read_byte(pc + 1, &cur) < 0) | |
615 | goto fault; | |
616 | ||
617 | if (cur >= 0xf0 && cur <= 0xf7) { | |
618 | /* JMP (An) / CALLS (An) */ | |
619 | switch (cur & 3) { | |
620 | case 0: x = regs->a0; break; | |
621 | case 1: x = regs->a1; break; | |
622 | case 2: x = regs->a2; break; | |
623 | case 3: x = regs->a3; break; | |
624 | } | |
625 | if (!__gdbstub_mark_bp((u8 *) x, 0)) | |
626 | goto fault; | |
627 | } else if (cur == 0xfc) { | |
628 | /* RETS */ | |
629 | if (gdbstub_read_byte( | |
630 | sp + 0, ((u8 *) &x) + 0) < 0 || | |
631 | gdbstub_read_byte( | |
632 | sp + 1, ((u8 *) &x) + 1) < 0 || | |
633 | gdbstub_read_byte( | |
634 | sp + 2, ((u8 *) &x) + 2) < 0 || | |
635 | gdbstub_read_byte( | |
636 | sp + 3, ((u8 *) &x) + 3) < 0) | |
637 | goto fault; | |
638 | if (!__gdbstub_mark_bp((u8 *) x, 0)) | |
639 | goto fault; | |
640 | } else if (cur == 0xfd) { | |
641 | /* RTI */ | |
642 | if (gdbstub_read_byte( | |
643 | sp + 4, ((u8 *) &x) + 0) < 0 || | |
644 | gdbstub_read_byte( | |
645 | sp + 5, ((u8 *) &x) + 1) < 0 || | |
646 | gdbstub_read_byte( | |
647 | sp + 6, ((u8 *) &x) + 2) < 0 || | |
648 | gdbstub_read_byte( | |
649 | sp + 7, ((u8 *) &x) + 3) < 0) | |
650 | goto fault; | |
651 | if (!__gdbstub_mark_bp((u8 *) x, 0)) | |
652 | goto fault; | |
653 | } else { | |
654 | if (!__gdbstub_mark_bp(pc + 2, 0)) | |
655 | goto fault; | |
656 | } | |
657 | ||
658 | break; | |
659 | ||
660 | /* potential 3-byte conditional branches */ | |
661 | case 0xf8: | |
662 | if (gdbstub_read_byte(pc + 1, &cur) < 0) | |
663 | goto fault; | |
664 | if (!__gdbstub_mark_bp(pc + 3, 0)) | |
665 | goto fault; | |
666 | ||
667 | if (cur >= 0xe8 && cur <= 0xeb) { | |
668 | if (gdbstub_read_byte( | |
669 | pc + 2, ((u8 *) &x) + 0) < 0) | |
670 | goto fault; | |
671 | if ((x < 0 || x > 3) && | |
672 | !__gdbstub_mark_bp(pc + (s8) x, 1)) | |
673 | goto fault; | |
674 | } | |
675 | break; | |
676 | ||
677 | case 0xfa: | |
678 | if (gdbstub_read_byte(pc + 1, &cur) < 0) | |
679 | goto fault; | |
680 | ||
681 | if (cur == 0xff) { | |
682 | /* CALLS (d16,PC) */ | |
683 | if (gdbstub_read_byte( | |
684 | pc + 2, ((u8 *) &x) + 0) < 0 || | |
685 | gdbstub_read_byte( | |
686 | pc + 3, ((u8 *) &x) + 1) < 0) | |
687 | goto fault; | |
688 | if (!__gdbstub_mark_bp(pc + (s16) x, 0)) | |
689 | goto fault; | |
690 | } else { | |
691 | if (!__gdbstub_mark_bp(pc + 4, 0)) | |
692 | goto fault; | |
693 | } | |
694 | break; | |
695 | ||
696 | case 0xfc: | |
697 | if (gdbstub_read_byte(pc + 1, &cur) < 0) | |
698 | goto fault; | |
699 | if (cur == 0xff) { | |
700 | /* CALLS (d32,PC) */ | |
701 | if (gdbstub_read_byte( | |
702 | pc + 2, ((u8 *) &x) + 0) < 0 || | |
703 | gdbstub_read_byte( | |
704 | pc + 3, ((u8 *) &x) + 1) < 0 || | |
705 | gdbstub_read_byte( | |
706 | pc + 4, ((u8 *) &x) + 2) < 0 || | |
707 | gdbstub_read_byte( | |
708 | pc + 5, ((u8 *) &x) + 3) < 0) | |
709 | goto fault; | |
710 | if (!__gdbstub_mark_bp( | |
711 | pc + (s32) x, 0)) | |
712 | goto fault; | |
713 | } else { | |
714 | if (!__gdbstub_mark_bp( | |
715 | pc + 6, 0)) | |
716 | goto fault; | |
717 | } | |
718 | break; | |
719 | ||
720 | } | |
721 | } | |
722 | ||
723 | gdbstub_bkpt("Step: %02x at %p; %02x at %p\n", | |
724 | step_bp[0].opcode[0], step_bp[0].addr, | |
725 | step_bp[1].opcode[0], step_bp[1].addr); | |
726 | ||
727 | if (step_bp[0].addr) { | |
728 | #ifdef GDBSTUB_USE_F7F7_AS_BREAKPOINT | |
729 | if (gdbstub_write_byte(0xF7, step_bp[0].addr + 0) < 0 || | |
730 | gdbstub_write_byte(0xF7, step_bp[0].addr + 1) < 0) | |
731 | goto fault; | |
732 | #else | |
733 | if (gdbstub_write_byte(0xFF, step_bp[0].addr + 0) < 0) | |
734 | goto fault; | |
735 | #endif | |
736 | } | |
737 | ||
738 | if (step_bp[1].addr) { | |
739 | #ifdef GDBSTUB_USE_F7F7_AS_BREAKPOINT | |
740 | if (gdbstub_write_byte(0xF7, step_bp[1].addr + 0) < 0 || | |
741 | gdbstub_write_byte(0xF7, step_bp[1].addr + 1) < 0) | |
742 | goto fault; | |
743 | #else | |
744 | if (gdbstub_write_byte(0xFF, step_bp[1].addr + 0) < 0) | |
745 | goto fault; | |
746 | #endif | |
747 | } | |
748 | ||
749 | return 0; | |
750 | ||
751 | fault: | |
752 | /* uh-oh - silly address alert, try and restore things */ | |
753 | __gdbstub_restore_bp(); | |
754 | return -EFAULT; | |
755 | } | |
756 | ||
757 | #ifdef CONFIG_GDBSTUB_CONSOLE | |
758 | ||
759 | void gdbstub_console_write(struct console *con, const char *p, unsigned n) | |
760 | { | |
761 | static const char gdbstub_cr[] = { 0x0d }; | |
762 | char outbuf[26]; | |
763 | int qty; | |
764 | u8 busy; | |
765 | ||
766 | busy = gdbstub_busy; | |
767 | gdbstub_busy = 1; | |
768 | ||
769 | outbuf[0] = 'O'; | |
770 | ||
771 | while (n > 0) { | |
772 | qty = 1; | |
773 | ||
774 | while (n > 0 && qty < 20) { | |
775 | mem2hex(p, outbuf + qty, 2, 0); | |
776 | qty += 2; | |
777 | if (*p == 0x0a) { | |
778 | mem2hex(gdbstub_cr, outbuf + qty, 2, 0); | |
779 | qty += 2; | |
780 | } | |
781 | p++; | |
782 | n--; | |
783 | } | |
784 | ||
785 | outbuf[qty] = 0; | |
786 | putpacket(outbuf); | |
787 | } | |
788 | ||
789 | gdbstub_busy = busy; | |
790 | } | |
791 | ||
792 | static kdev_t gdbstub_console_dev(struct console *con) | |
793 | { | |
794 | return MKDEV(1, 3); /* /dev/null */ | |
795 | } | |
796 | ||
797 | static struct console gdbstub_console = { | |
798 | .name = "gdb", | |
799 | .write = gdbstub_console_write, | |
800 | .device = gdbstub_console_dev, | |
801 | .flags = CON_PRINTBUFFER, | |
802 | .index = -1, | |
803 | }; | |
804 | ||
805 | #endif | |
806 | ||
807 | /* | |
808 | * Convert the memory pointed to by mem into hex, placing result in buf. | |
809 | * - if successful, return a pointer to the last char put in buf (NUL) | |
810 | * - in case of mem fault, return NULL | |
811 | * may_fault is non-zero if we are reading from arbitrary memory, but is | |
812 | * currently not used. | |
813 | */ | |
814 | static | |
815 | unsigned char *mem2hex(const void *_mem, char *buf, int count, int may_fault) | |
816 | { | |
817 | const u8 *mem = _mem; | |
818 | u8 ch[4]; | |
819 | ||
820 | if ((u32) mem & 1 && count >= 1) { | |
821 | if (gdbstub_read_byte(mem, ch) != 0) | |
822 | return 0; | |
26824972 | 823 | buf = pack_hex_byte(buf, ch[0]); |
b920de1b DH |
824 | mem++; |
825 | count--; | |
826 | } | |
827 | ||
828 | if ((u32) mem & 3 && count >= 2) { | |
829 | if (gdbstub_read_word(mem, ch) != 0) | |
830 | return 0; | |
26824972 HH |
831 | buf = pack_hex_byte(buf, ch[0]); |
832 | buf = pack_hex_byte(buf, ch[1]); | |
b920de1b DH |
833 | mem += 2; |
834 | count -= 2; | |
835 | } | |
836 | ||
837 | while (count >= 4) { | |
838 | if (gdbstub_read_dword(mem, ch) != 0) | |
839 | return 0; | |
26824972 HH |
840 | buf = pack_hex_byte(buf, ch[0]); |
841 | buf = pack_hex_byte(buf, ch[1]); | |
842 | buf = pack_hex_byte(buf, ch[2]); | |
843 | buf = pack_hex_byte(buf, ch[3]); | |
b920de1b DH |
844 | mem += 4; |
845 | count -= 4; | |
846 | } | |
847 | ||
848 | if (count >= 2) { | |
849 | if (gdbstub_read_word(mem, ch) != 0) | |
850 | return 0; | |
26824972 HH |
851 | buf = pack_hex_byte(buf, ch[0]); |
852 | buf = pack_hex_byte(buf, ch[1]); | |
b920de1b DH |
853 | mem += 2; |
854 | count -= 2; | |
855 | } | |
856 | ||
857 | if (count >= 1) { | |
858 | if (gdbstub_read_byte(mem, ch) != 0) | |
859 | return 0; | |
26824972 | 860 | buf = pack_hex_byte(buf, ch[0]); |
b920de1b DH |
861 | } |
862 | ||
863 | *buf = 0; | |
864 | return buf; | |
865 | } | |
866 | ||
867 | /* | |
868 | * convert the hex array pointed to by buf into binary to be placed in mem | |
869 | * return a pointer to the character AFTER the last byte written | |
870 | * may_fault is non-zero if we are reading from arbitrary memory, but is | |
871 | * currently not used. | |
872 | */ | |
873 | static | |
874 | const char *hex2mem(const char *buf, void *_mem, int count, int may_fault) | |
875 | { | |
876 | u8 *mem = _mem; | |
877 | union { | |
878 | u32 val; | |
879 | u8 b[4]; | |
880 | } ch; | |
881 | ||
882 | if ((u32) mem & 1 && count >= 1) { | |
883 | ch.b[0] = hex(*buf++) << 4; | |
884 | ch.b[0] |= hex(*buf++); | |
885 | if (gdbstub_write_byte(ch.val, mem) != 0) | |
886 | return 0; | |
887 | mem++; | |
888 | count--; | |
889 | } | |
890 | ||
891 | if ((u32) mem & 3 && count >= 2) { | |
892 | ch.b[0] = hex(*buf++) << 4; | |
893 | ch.b[0] |= hex(*buf++); | |
894 | ch.b[1] = hex(*buf++) << 4; | |
895 | ch.b[1] |= hex(*buf++); | |
896 | if (gdbstub_write_word(ch.val, mem) != 0) | |
897 | return 0; | |
898 | mem += 2; | |
899 | count -= 2; | |
900 | } | |
901 | ||
902 | while (count >= 4) { | |
903 | ch.b[0] = hex(*buf++) << 4; | |
904 | ch.b[0] |= hex(*buf++); | |
905 | ch.b[1] = hex(*buf++) << 4; | |
906 | ch.b[1] |= hex(*buf++); | |
907 | ch.b[2] = hex(*buf++) << 4; | |
908 | ch.b[2] |= hex(*buf++); | |
909 | ch.b[3] = hex(*buf++) << 4; | |
910 | ch.b[3] |= hex(*buf++); | |
911 | if (gdbstub_write_dword(ch.val, mem) != 0) | |
912 | return 0; | |
913 | mem += 4; | |
914 | count -= 4; | |
915 | } | |
916 | ||
917 | if (count >= 2) { | |
918 | ch.b[0] = hex(*buf++) << 4; | |
919 | ch.b[0] |= hex(*buf++); | |
920 | ch.b[1] = hex(*buf++) << 4; | |
921 | ch.b[1] |= hex(*buf++); | |
922 | if (gdbstub_write_word(ch.val, mem) != 0) | |
923 | return 0; | |
924 | mem += 2; | |
925 | count -= 2; | |
926 | } | |
927 | ||
928 | if (count >= 1) { | |
929 | ch.b[0] = hex(*buf++) << 4; | |
930 | ch.b[0] |= hex(*buf++); | |
931 | if (gdbstub_write_byte(ch.val, mem) != 0) | |
932 | return 0; | |
933 | } | |
934 | ||
935 | return buf; | |
936 | } | |
937 | ||
938 | /* | |
939 | * This table contains the mapping between MN10300 exception codes, and | |
940 | * signals, which are primarily what GDB understands. It also indicates | |
941 | * which hardware traps we need to commandeer when initializing the stub. | |
942 | */ | |
943 | static const struct excep_to_sig_map { | |
944 | enum exception_code excep; /* MN10300 exception code */ | |
945 | unsigned char signo; /* Signal that we map this into */ | |
946 | } excep_to_sig_map[] = { | |
947 | { EXCEP_ITLBMISS, SIGSEGV }, | |
948 | { EXCEP_DTLBMISS, SIGSEGV }, | |
949 | { EXCEP_TRAP, SIGTRAP }, | |
950 | { EXCEP_ISTEP, SIGTRAP }, | |
951 | { EXCEP_IBREAK, SIGTRAP }, | |
952 | { EXCEP_OBREAK, SIGTRAP }, | |
953 | { EXCEP_UNIMPINS, SIGILL }, | |
954 | { EXCEP_UNIMPEXINS, SIGILL }, | |
955 | { EXCEP_MEMERR, SIGSEGV }, | |
956 | { EXCEP_MISALIGN, SIGSEGV }, | |
957 | { EXCEP_BUSERROR, SIGBUS }, | |
958 | { EXCEP_ILLINSACC, SIGSEGV }, | |
959 | { EXCEP_ILLDATACC, SIGSEGV }, | |
960 | { EXCEP_IOINSACC, SIGSEGV }, | |
961 | { EXCEP_PRIVINSACC, SIGSEGV }, | |
962 | { EXCEP_PRIVDATACC, SIGSEGV }, | |
963 | { EXCEP_FPU_DISABLED, SIGFPE }, | |
964 | { EXCEP_FPU_UNIMPINS, SIGFPE }, | |
965 | { EXCEP_FPU_OPERATION, SIGFPE }, | |
966 | { EXCEP_WDT, SIGALRM }, | |
967 | { EXCEP_NMI, SIGQUIT }, | |
968 | { EXCEP_IRQ_LEVEL0, SIGINT }, | |
969 | { EXCEP_IRQ_LEVEL1, SIGINT }, | |
970 | { EXCEP_IRQ_LEVEL2, SIGINT }, | |
971 | { EXCEP_IRQ_LEVEL3, SIGINT }, | |
972 | { EXCEP_IRQ_LEVEL4, SIGINT }, | |
973 | { EXCEP_IRQ_LEVEL5, SIGINT }, | |
974 | { EXCEP_IRQ_LEVEL6, SIGINT }, | |
975 | { 0, 0} | |
976 | }; | |
977 | ||
978 | /* | |
979 | * convert the MN10300 exception code into a UNIX signal number | |
980 | */ | |
981 | static int computeSignal(enum exception_code excep) | |
982 | { | |
983 | const struct excep_to_sig_map *map; | |
984 | ||
985 | for (map = excep_to_sig_map; map->signo; map++) | |
986 | if (map->excep == excep) | |
987 | return map->signo; | |
988 | ||
989 | return SIGHUP; /* default for things we don't know about */ | |
990 | } | |
991 | ||
992 | static u32 gdbstub_fpcr, gdbstub_fpufs_array[32]; | |
993 | ||
994 | /* | |
995 | * | |
996 | */ | |
997 | static void gdbstub_store_fpu(void) | |
998 | { | |
999 | #ifdef CONFIG_FPU | |
1000 | ||
1001 | asm volatile( | |
1002 | "or %2,epsw\n" | |
1003 | #ifdef CONFIG_MN10300_PROC_MN103E010 | |
1004 | "nop\n" | |
1005 | "nop\n" | |
1006 | #endif | |
1007 | "mov %1, a1\n" | |
1008 | "fmov fs0, (a1+)\n" | |
1009 | "fmov fs1, (a1+)\n" | |
1010 | "fmov fs2, (a1+)\n" | |
1011 | "fmov fs3, (a1+)\n" | |
1012 | "fmov fs4, (a1+)\n" | |
1013 | "fmov fs5, (a1+)\n" | |
1014 | "fmov fs6, (a1+)\n" | |
1015 | "fmov fs7, (a1+)\n" | |
1016 | "fmov fs8, (a1+)\n" | |
1017 | "fmov fs9, (a1+)\n" | |
1018 | "fmov fs10, (a1+)\n" | |
1019 | "fmov fs11, (a1+)\n" | |
1020 | "fmov fs12, (a1+)\n" | |
1021 | "fmov fs13, (a1+)\n" | |
1022 | "fmov fs14, (a1+)\n" | |
1023 | "fmov fs15, (a1+)\n" | |
1024 | "fmov fs16, (a1+)\n" | |
1025 | "fmov fs17, (a1+)\n" | |
1026 | "fmov fs18, (a1+)\n" | |
1027 | "fmov fs19, (a1+)\n" | |
1028 | "fmov fs20, (a1+)\n" | |
1029 | "fmov fs21, (a1+)\n" | |
1030 | "fmov fs22, (a1+)\n" | |
1031 | "fmov fs23, (a1+)\n" | |
1032 | "fmov fs24, (a1+)\n" | |
1033 | "fmov fs25, (a1+)\n" | |
1034 | "fmov fs26, (a1+)\n" | |
1035 | "fmov fs27, (a1+)\n" | |
1036 | "fmov fs28, (a1+)\n" | |
1037 | "fmov fs29, (a1+)\n" | |
1038 | "fmov fs30, (a1+)\n" | |
1039 | "fmov fs31, (a1+)\n" | |
1040 | "fmov fpcr, %0\n" | |
1041 | : "=d"(gdbstub_fpcr) | |
1042 | : "g" (&gdbstub_fpufs_array), "i"(EPSW_FE) | |
1043 | : "a1" | |
1044 | ); | |
1045 | #endif | |
1046 | } | |
1047 | ||
1048 | /* | |
1049 | * | |
1050 | */ | |
1051 | static void gdbstub_load_fpu(void) | |
1052 | { | |
1053 | #ifdef CONFIG_FPU | |
1054 | ||
1055 | asm volatile( | |
1056 | "or %1,epsw\n" | |
1057 | #ifdef CONFIG_MN10300_PROC_MN103E010 | |
1058 | "nop\n" | |
1059 | "nop\n" | |
1060 | #endif | |
1061 | "mov %0, a1\n" | |
1062 | "fmov (a1+), fs0\n" | |
1063 | "fmov (a1+), fs1\n" | |
1064 | "fmov (a1+), fs2\n" | |
1065 | "fmov (a1+), fs3\n" | |
1066 | "fmov (a1+), fs4\n" | |
1067 | "fmov (a1+), fs5\n" | |
1068 | "fmov (a1+), fs6\n" | |
1069 | "fmov (a1+), fs7\n" | |
1070 | "fmov (a1+), fs8\n" | |
1071 | "fmov (a1+), fs9\n" | |
1072 | "fmov (a1+), fs10\n" | |
1073 | "fmov (a1+), fs11\n" | |
1074 | "fmov (a1+), fs12\n" | |
1075 | "fmov (a1+), fs13\n" | |
1076 | "fmov (a1+), fs14\n" | |
1077 | "fmov (a1+), fs15\n" | |
1078 | "fmov (a1+), fs16\n" | |
1079 | "fmov (a1+), fs17\n" | |
1080 | "fmov (a1+), fs18\n" | |
1081 | "fmov (a1+), fs19\n" | |
1082 | "fmov (a1+), fs20\n" | |
1083 | "fmov (a1+), fs21\n" | |
1084 | "fmov (a1+), fs22\n" | |
1085 | "fmov (a1+), fs23\n" | |
1086 | "fmov (a1+), fs24\n" | |
1087 | "fmov (a1+), fs25\n" | |
1088 | "fmov (a1+), fs26\n" | |
1089 | "fmov (a1+), fs27\n" | |
1090 | "fmov (a1+), fs28\n" | |
1091 | "fmov (a1+), fs29\n" | |
1092 | "fmov (a1+), fs30\n" | |
1093 | "fmov (a1+), fs31\n" | |
1094 | "fmov %2, fpcr\n" | |
1095 | : | |
1096 | : "g" (&gdbstub_fpufs_array), "i"(EPSW_FE), "d"(gdbstub_fpcr) | |
1097 | : "a1" | |
1098 | ); | |
1099 | #endif | |
1100 | } | |
1101 | ||
1102 | /* | |
1103 | * set a software breakpoint | |
1104 | */ | |
1105 | int gdbstub_set_breakpoint(u8 *addr, int len) | |
1106 | { | |
1107 | int bkpt, loop, xloop; | |
1108 | ||
1109 | #ifdef GDBSTUB_USE_F7F7_AS_BREAKPOINT | |
1110 | len = (len + 1) & ~1; | |
1111 | #endif | |
1112 | ||
1113 | gdbstub_bkpt("setbkpt(%p,%d)\n", addr, len); | |
1114 | ||
1115 | for (bkpt = 255; bkpt >= 0; bkpt--) | |
1116 | if (!gdbstub_bkpts[bkpt].addr) | |
1117 | break; | |
1118 | if (bkpt < 0) | |
1119 | return -ENOSPC; | |
1120 | ||
1121 | for (loop = 0; loop < len; loop++) | |
1122 | if (gdbstub_read_byte(&addr[loop], | |
1123 | &gdbstub_bkpts[bkpt].origbytes[loop] | |
1124 | ) < 0) | |
1125 | return -EFAULT; | |
1126 | ||
1127 | gdbstub_flush_caches = 1; | |
1128 | ||
1129 | #ifdef GDBSTUB_USE_F7F7_AS_BREAKPOINT | |
1130 | for (loop = 0; loop < len; loop++) | |
1131 | if (gdbstub_write_byte(0xF7, &addr[loop]) < 0) | |
1132 | goto restore; | |
1133 | #else | |
1134 | for (loop = 0; loop < len; loop++) | |
1135 | if (gdbstub_write_byte(0xFF, &addr[loop]) < 0) | |
1136 | goto restore; | |
1137 | #endif | |
1138 | ||
1139 | gdbstub_bkpts[bkpt].addr = addr; | |
1140 | gdbstub_bkpts[bkpt].len = len; | |
1141 | ||
1142 | gdbstub_bkpt("Set BKPT[%02x]: %p-%p {%02x%02x%02x%02x%02x%02x%02x}\n", | |
1143 | bkpt, | |
1144 | gdbstub_bkpts[bkpt].addr, | |
1145 | gdbstub_bkpts[bkpt].addr + gdbstub_bkpts[bkpt].len - 1, | |
1146 | gdbstub_bkpts[bkpt].origbytes[0], | |
1147 | gdbstub_bkpts[bkpt].origbytes[1], | |
1148 | gdbstub_bkpts[bkpt].origbytes[2], | |
1149 | gdbstub_bkpts[bkpt].origbytes[3], | |
1150 | gdbstub_bkpts[bkpt].origbytes[4], | |
1151 | gdbstub_bkpts[bkpt].origbytes[5], | |
1152 | gdbstub_bkpts[bkpt].origbytes[6] | |
1153 | ); | |
1154 | ||
1155 | return 0; | |
1156 | ||
1157 | restore: | |
1158 | for (xloop = 0; xloop < loop; xloop++) | |
1159 | gdbstub_write_byte(gdbstub_bkpts[bkpt].origbytes[xloop], | |
1160 | addr + xloop); | |
1161 | return -EFAULT; | |
1162 | } | |
1163 | ||
1164 | /* | |
1165 | * clear a software breakpoint | |
1166 | */ | |
1167 | int gdbstub_clear_breakpoint(u8 *addr, int len) | |
1168 | { | |
1169 | int bkpt, loop; | |
1170 | ||
1171 | #ifdef GDBSTUB_USE_F7F7_AS_BREAKPOINT | |
1172 | len = (len + 1) & ~1; | |
1173 | #endif | |
1174 | ||
1175 | gdbstub_bkpt("clearbkpt(%p,%d)\n", addr, len); | |
1176 | ||
1177 | for (bkpt = 255; bkpt >= 0; bkpt--) | |
1178 | if (gdbstub_bkpts[bkpt].addr == addr && | |
1179 | gdbstub_bkpts[bkpt].len == len) | |
1180 | break; | |
1181 | if (bkpt < 0) | |
1182 | return -ENOENT; | |
1183 | ||
1184 | gdbstub_bkpts[bkpt].addr = NULL; | |
1185 | ||
1186 | gdbstub_flush_caches = 1; | |
1187 | ||
1188 | for (loop = 0; loop < len; loop++) | |
1189 | if (gdbstub_write_byte(gdbstub_bkpts[bkpt].origbytes[loop], | |
1190 | addr + loop) < 0) | |
1191 | return -EFAULT; | |
1192 | ||
1193 | return 0; | |
1194 | } | |
1195 | ||
1196 | /* | |
1197 | * This function does all command processing for interfacing to gdb | |
1198 | * - returns 1 if the exception should be skipped, 0 otherwise. | |
1199 | */ | |
1200 | static int gdbstub(struct pt_regs *regs, enum exception_code excep) | |
1201 | { | |
1202 | unsigned long *stack; | |
1203 | unsigned long epsw, mdr; | |
1204 | uint32_t zero, ssp; | |
1205 | uint8_t broke; | |
1206 | char *ptr; | |
1207 | int sigval; | |
1208 | int addr; | |
1209 | int length; | |
1210 | int loop; | |
1211 | ||
1212 | if (excep == EXCEP_FPU_DISABLED) | |
1213 | return 0; | |
1214 | ||
1215 | gdbstub_flush_caches = 0; | |
1216 | ||
1217 | mn10300_set_gdbleds(1); | |
1218 | ||
1219 | asm volatile("mov mdr,%0" : "=d"(mdr)); | |
1220 | asm volatile("mov epsw,%0" : "=d"(epsw)); | |
1221 | asm volatile("mov %0,epsw" | |
1222 | :: "d"((epsw & ~EPSW_IM) | EPSW_IE | EPSW_IM_1)); | |
1223 | ||
1224 | gdbstub_store_fpu(); | |
1225 | ||
1226 | #ifdef CONFIG_GDBSTUB_IMMEDIATE | |
1227 | /* skip the initial pause loop */ | |
1228 | if (regs->pc == (unsigned long) __gdbstub_pause) | |
1229 | regs->pc = (unsigned long) start_kernel; | |
1230 | #endif | |
1231 | ||
1232 | /* if we were single stepping, restore the opcodes hoisted for the | |
1233 | * breakpoint[s] */ | |
1234 | broke = 0; | |
1235 | if ((step_bp[0].addr && step_bp[0].addr == (u8 *) regs->pc) || | |
1236 | (step_bp[1].addr && step_bp[1].addr == (u8 *) regs->pc)) | |
1237 | broke = 1; | |
1238 | ||
1239 | __gdbstub_restore_bp(); | |
1240 | ||
1241 | if (gdbstub_rx_unget) { | |
1242 | sigval = SIGINT; | |
1243 | if (gdbstub_rx_unget != 3) | |
1244 | goto packet_waiting; | |
1245 | gdbstub_rx_unget = 0; | |
1246 | } | |
1247 | ||
1248 | stack = (unsigned long *) regs->sp; | |
1249 | sigval = broke ? SIGTRAP : computeSignal(excep); | |
1250 | ||
1251 | /* send information about a BUG() */ | |
1252 | if (!user_mode(regs) && excep == EXCEP_SYSCALL15) { | |
1253 | const struct bug_entry *bug; | |
1254 | ||
1255 | bug = find_bug(regs->pc); | |
1256 | if (bug) | |
1257 | goto found_bug; | |
1258 | length = snprintf(trans_buffer, sizeof(trans_buffer), | |
1259 | "BUG() at address %lx\n", regs->pc); | |
1260 | goto send_bug_pkt; | |
1261 | ||
1262 | found_bug: | |
1263 | length = snprintf(trans_buffer, sizeof(trans_buffer), | |
1264 | "BUG() at address %lx (%s:%d)\n", | |
1265 | regs->pc, bug->file, bug->line); | |
1266 | ||
1267 | send_bug_pkt: | |
1268 | ptr = output_buffer; | |
1269 | *ptr++ = 'O'; | |
1270 | ptr = mem2hex(trans_buffer, ptr, length, 0); | |
1271 | *ptr = 0; | |
1272 | putpacket(output_buffer); | |
1273 | ||
1274 | regs->pc -= 2; | |
1275 | sigval = SIGABRT; | |
1276 | } else if (regs->pc == (unsigned long) __gdbstub_bug_trap) { | |
1277 | regs->pc = regs->mdr; | |
1278 | sigval = SIGABRT; | |
1279 | } | |
1280 | ||
1281 | /* | |
1282 | * send a message to the debugger's user saying what happened if it may | |
1283 | * not be clear cut (we can't map exceptions onto signals properly) | |
1284 | */ | |
1285 | if (sigval != SIGINT && sigval != SIGTRAP && sigval != SIGILL) { | |
1286 | static const char title[] = "Excep ", tbcberr[] = "BCBERR "; | |
1287 | static const char crlf[] = "\r\n"; | |
1288 | char hx; | |
1289 | u32 bcberr = BCBERR; | |
1290 | ||
1291 | ptr = output_buffer; | |
1292 | *ptr++ = 'O'; | |
1293 | ptr = mem2hex(title, ptr, sizeof(title) - 1, 0); | |
1294 | ||
26824972 HH |
1295 | hx = hex_asc_hi(excep >> 8); |
1296 | ptr = pack_hex_byte(ptr, hx); | |
1297 | hx = hex_asc_lo(excep >> 8); | |
1298 | ptr = pack_hex_byte(ptr, hx); | |
1299 | hx = hex_asc_hi(excep); | |
1300 | ptr = pack_hex_byte(ptr, hx); | |
1301 | hx = hex_asc_lo(excep); | |
1302 | ptr = pack_hex_byte(ptr, hx); | |
b920de1b DH |
1303 | |
1304 | ptr = mem2hex(crlf, ptr, sizeof(crlf) - 1, 0); | |
1305 | *ptr = 0; | |
1306 | putpacket(output_buffer); /* send it off... */ | |
1307 | ||
1308 | /* BCBERR */ | |
1309 | ptr = output_buffer; | |
1310 | *ptr++ = 'O'; | |
1311 | ptr = mem2hex(tbcberr, ptr, sizeof(tbcberr) - 1, 0); | |
1312 | ||
26824972 HH |
1313 | hx = hex_asc_hi(bcberr >> 24); |
1314 | ptr = pack_hex_byte(ptr, hx); | |
1315 | hx = hex_asc_lo(bcberr >> 24); | |
1316 | ptr = pack_hex_byte(ptr, hx); | |
1317 | hx = hex_asc_hi(bcberr >> 16); | |
1318 | ptr = pack_hex_byte(ptr, hx); | |
1319 | hx = hex_asc_lo(bcberr >> 16); | |
1320 | ptr = pack_hex_byte(ptr, hx); | |
1321 | hx = hex_asc_hi(bcberr >> 8); | |
1322 | ptr = pack_hex_byte(ptr, hx); | |
1323 | hx = hex_asc_lo(bcberr >> 8); | |
1324 | ptr = pack_hex_byte(ptr, hx); | |
1325 | hx = hex_asc_hi(bcberr); | |
1326 | ptr = pack_hex_byte(ptr, hx); | |
1327 | hx = hex_asc_lo(bcberr); | |
1328 | ptr = pack_hex_byte(ptr, hx); | |
b920de1b DH |
1329 | |
1330 | ptr = mem2hex(crlf, ptr, sizeof(crlf) - 1, 0); | |
1331 | *ptr = 0; | |
1332 | putpacket(output_buffer); /* send it off... */ | |
1333 | } | |
1334 | ||
1335 | /* | |
1336 | * tell the debugger that an exception has occurred | |
1337 | */ | |
1338 | ptr = output_buffer; | |
1339 | ||
1340 | /* | |
1341 | * Send trap type (converted to signal) | |
1342 | */ | |
1343 | *ptr++ = 'T'; | |
26824972 | 1344 | ptr = pack_hex_byte(ptr, sigval); |
b920de1b DH |
1345 | |
1346 | /* | |
1347 | * Send Error PC | |
1348 | */ | |
26824972 | 1349 | ptr = pack_hex_byte(ptr, GDB_REGID_PC); |
b920de1b DH |
1350 | *ptr++ = ':'; |
1351 | ptr = mem2hex(®s->pc, ptr, 4, 0); | |
1352 | *ptr++ = ';'; | |
1353 | ||
1354 | /* | |
1355 | * Send frame pointer | |
1356 | */ | |
26824972 | 1357 | ptr = pack_hex_byte(ptr, GDB_REGID_FP); |
b920de1b DH |
1358 | *ptr++ = ':'; |
1359 | ptr = mem2hex(®s->a3, ptr, 4, 0); | |
1360 | *ptr++ = ';'; | |
1361 | ||
1362 | /* | |
1363 | * Send stack pointer | |
1364 | */ | |
1365 | ssp = (unsigned long) (regs + 1); | |
26824972 | 1366 | ptr = pack_hex_byte(ptr, GDB_REGID_SP); |
b920de1b DH |
1367 | *ptr++ = ':'; |
1368 | ptr = mem2hex(&ssp, ptr, 4, 0); | |
1369 | *ptr++ = ';'; | |
1370 | ||
1371 | *ptr++ = 0; | |
1372 | putpacket(output_buffer); /* send it off... */ | |
1373 | ||
1374 | packet_waiting: | |
1375 | /* | |
1376 | * Wait for input from remote GDB | |
1377 | */ | |
1378 | while (1) { | |
1379 | output_buffer[0] = 0; | |
1380 | getpacket(input_buffer); | |
1381 | ||
1382 | switch (input_buffer[0]) { | |
1383 | /* request repeat of last signal number */ | |
1384 | case '?': | |
1385 | output_buffer[0] = 'S'; | |
26824972 HH |
1386 | output_buffer[1] = hex_asc_hi(sigval); |
1387 | output_buffer[2] = hex_asc_lo(sigval); | |
b920de1b DH |
1388 | output_buffer[3] = 0; |
1389 | break; | |
1390 | ||
1391 | case 'd': | |
1392 | /* toggle debug flag */ | |
1393 | break; | |
1394 | ||
1395 | /* | |
1396 | * Return the value of the CPU registers | |
1397 | */ | |
1398 | case 'g': | |
1399 | zero = 0; | |
1400 | ssp = (u32) (regs + 1); | |
1401 | ptr = output_buffer; | |
1402 | ptr = mem2hex(®s->d0, ptr, 4, 0); | |
1403 | ptr = mem2hex(®s->d1, ptr, 4, 0); | |
1404 | ptr = mem2hex(®s->d2, ptr, 4, 0); | |
1405 | ptr = mem2hex(®s->d3, ptr, 4, 0); | |
1406 | ptr = mem2hex(®s->a0, ptr, 4, 0); | |
1407 | ptr = mem2hex(®s->a1, ptr, 4, 0); | |
1408 | ptr = mem2hex(®s->a2, ptr, 4, 0); | |
1409 | ptr = mem2hex(®s->a3, ptr, 4, 0); | |
1410 | ||
1411 | ptr = mem2hex(&ssp, ptr, 4, 0); /* 8 */ | |
1412 | ptr = mem2hex(®s->pc, ptr, 4, 0); | |
1413 | ptr = mem2hex(®s->mdr, ptr, 4, 0); | |
1414 | ptr = mem2hex(®s->epsw, ptr, 4, 0); | |
1415 | ptr = mem2hex(®s->lir, ptr, 4, 0); | |
1416 | ptr = mem2hex(®s->lar, ptr, 4, 0); | |
1417 | ptr = mem2hex(®s->mdrq, ptr, 4, 0); | |
1418 | ||
1419 | ptr = mem2hex(®s->e0, ptr, 4, 0); /* 15 */ | |
1420 | ptr = mem2hex(®s->e1, ptr, 4, 0); | |
1421 | ptr = mem2hex(®s->e2, ptr, 4, 0); | |
1422 | ptr = mem2hex(®s->e3, ptr, 4, 0); | |
1423 | ptr = mem2hex(®s->e4, ptr, 4, 0); | |
1424 | ptr = mem2hex(®s->e5, ptr, 4, 0); | |
1425 | ptr = mem2hex(®s->e6, ptr, 4, 0); | |
1426 | ptr = mem2hex(®s->e7, ptr, 4, 0); | |
1427 | ||
1428 | ptr = mem2hex(&ssp, ptr, 4, 0); | |
1429 | ptr = mem2hex(®s, ptr, 4, 0); | |
1430 | ptr = mem2hex(®s->sp, ptr, 4, 0); | |
1431 | ptr = mem2hex(®s->mcrh, ptr, 4, 0); /* 26 */ | |
1432 | ptr = mem2hex(®s->mcrl, ptr, 4, 0); | |
1433 | ptr = mem2hex(®s->mcvf, ptr, 4, 0); | |
1434 | ||
1435 | ptr = mem2hex(&gdbstub_fpcr, ptr, 4, 0); /* 29 - FPCR */ | |
1436 | ptr = mem2hex(&zero, ptr, 4, 0); | |
1437 | ptr = mem2hex(&zero, ptr, 4, 0); | |
1438 | for (loop = 0; loop < 32; loop++) | |
1439 | ptr = mem2hex(&gdbstub_fpufs_array[loop], | |
1440 | ptr, 4, 0); /* 32 - FS0-31 */ | |
1441 | ||
1442 | break; | |
1443 | ||
1444 | /* | |
1445 | * set the value of the CPU registers - return OK | |
1446 | */ | |
1447 | case 'G': | |
1448 | { | |
1449 | const char *ptr; | |
1450 | ||
1451 | ptr = &input_buffer[1]; | |
1452 | ptr = hex2mem(ptr, ®s->d0, 4, 0); | |
1453 | ptr = hex2mem(ptr, ®s->d1, 4, 0); | |
1454 | ptr = hex2mem(ptr, ®s->d2, 4, 0); | |
1455 | ptr = hex2mem(ptr, ®s->d3, 4, 0); | |
1456 | ptr = hex2mem(ptr, ®s->a0, 4, 0); | |
1457 | ptr = hex2mem(ptr, ®s->a1, 4, 0); | |
1458 | ptr = hex2mem(ptr, ®s->a2, 4, 0); | |
1459 | ptr = hex2mem(ptr, ®s->a3, 4, 0); | |
1460 | ||
1461 | ptr = hex2mem(ptr, &ssp, 4, 0); /* 8 */ | |
1462 | ptr = hex2mem(ptr, ®s->pc, 4, 0); | |
1463 | ptr = hex2mem(ptr, ®s->mdr, 4, 0); | |
1464 | ptr = hex2mem(ptr, ®s->epsw, 4, 0); | |
1465 | ptr = hex2mem(ptr, ®s->lir, 4, 0); | |
1466 | ptr = hex2mem(ptr, ®s->lar, 4, 0); | |
1467 | ptr = hex2mem(ptr, ®s->mdrq, 4, 0); | |
1468 | ||
1469 | ptr = hex2mem(ptr, ®s->e0, 4, 0); /* 15 */ | |
1470 | ptr = hex2mem(ptr, ®s->e1, 4, 0); | |
1471 | ptr = hex2mem(ptr, ®s->e2, 4, 0); | |
1472 | ptr = hex2mem(ptr, ®s->e3, 4, 0); | |
1473 | ptr = hex2mem(ptr, ®s->e4, 4, 0); | |
1474 | ptr = hex2mem(ptr, ®s->e5, 4, 0); | |
1475 | ptr = hex2mem(ptr, ®s->e6, 4, 0); | |
1476 | ptr = hex2mem(ptr, ®s->e7, 4, 0); | |
1477 | ||
1478 | ptr = hex2mem(ptr, &ssp, 4, 0); | |
1479 | ptr = hex2mem(ptr, &zero, 4, 0); | |
1480 | ptr = hex2mem(ptr, ®s->sp, 4, 0); | |
1481 | ptr = hex2mem(ptr, ®s->mcrh, 4, 0); /* 26 */ | |
1482 | ptr = hex2mem(ptr, ®s->mcrl, 4, 0); | |
1483 | ptr = hex2mem(ptr, ®s->mcvf, 4, 0); | |
1484 | ||
1485 | ptr = hex2mem(ptr, &zero, 4, 0); /* 29 - FPCR */ | |
1486 | ptr = hex2mem(ptr, &zero, 4, 0); | |
1487 | ptr = hex2mem(ptr, &zero, 4, 0); | |
1488 | for (loop = 0; loop < 32; loop++) /* 32 - FS0-31 */ | |
1489 | ptr = hex2mem(ptr, &zero, 4, 0); | |
1490 | ||
1491 | #if 0 | |
1492 | /* | |
1493 | * See if the stack pointer has moved. If so, then copy | |
1494 | * the saved locals and ins to the new location. | |
1495 | */ | |
1496 | unsigned long *newsp = (unsigned long *) registers[SP]; | |
1497 | if (sp != newsp) | |
1498 | sp = memcpy(newsp, sp, 16 * 4); | |
1499 | #endif | |
1500 | ||
1501 | gdbstub_strcpy(output_buffer, "OK"); | |
1502 | } | |
1503 | break; | |
1504 | ||
1505 | /* | |
1506 | * mAA..AA,LLLL Read LLLL bytes at address AA..AA | |
1507 | */ | |
1508 | case 'm': | |
1509 | ptr = &input_buffer[1]; | |
1510 | ||
1511 | if (hexToInt(&ptr, &addr) && | |
1512 | *ptr++ == ',' && | |
1513 | hexToInt(&ptr, &length) | |
1514 | ) { | |
1515 | if (mem2hex((char *) addr, output_buffer, | |
1516 | length, 1)) | |
1517 | break; | |
1518 | gdbstub_strcpy(output_buffer, "E03"); | |
1519 | } else { | |
1520 | gdbstub_strcpy(output_buffer, "E01"); | |
1521 | } | |
1522 | break; | |
1523 | ||
1524 | /* | |
1525 | * MAA..AA,LLLL: Write LLLL bytes at address AA.AA | |
1526 | * return OK | |
1527 | */ | |
1528 | case 'M': | |
1529 | ptr = &input_buffer[1]; | |
1530 | ||
1531 | if (hexToInt(&ptr, &addr) && | |
1532 | *ptr++ == ',' && | |
1533 | hexToInt(&ptr, &length) && | |
1534 | *ptr++ == ':' | |
1535 | ) { | |
1536 | if (hex2mem(ptr, (char *) addr, length, 1)) | |
1537 | gdbstub_strcpy(output_buffer, "OK"); | |
1538 | else | |
1539 | gdbstub_strcpy(output_buffer, "E03"); | |
1540 | ||
1541 | gdbstub_flush_caches = 1; | |
1542 | } else { | |
1543 | gdbstub_strcpy(output_buffer, "E02"); | |
1544 | } | |
1545 | break; | |
1546 | ||
1547 | /* | |
1548 | * cAA..AA Continue at address AA..AA(optional) | |
1549 | */ | |
1550 | case 'c': | |
1551 | /* try to read optional parameter, pc unchanged if no | |
1552 | * parm */ | |
1553 | ||
1554 | ptr = &input_buffer[1]; | |
1555 | if (hexToInt(&ptr, &addr)) | |
1556 | regs->pc = addr; | |
1557 | goto done; | |
1558 | ||
1559 | /* | |
1560 | * kill the program | |
1561 | */ | |
1562 | case 'k' : | |
1563 | goto done; /* just continue */ | |
1564 | ||
1565 | /* | |
1566 | * Reset the whole machine (FIXME: system dependent) | |
1567 | */ | |
1568 | case 'r': | |
1569 | break; | |
1570 | ||
1571 | /* | |
1572 | * Step to next instruction | |
1573 | */ | |
1574 | case 's': | |
1575 | /* | |
1576 | * using the T flag doesn't seem to perform single | |
1577 | * stepping (it seems to wind up being caught by the | |
1578 | * JTAG unit), so we have to use breakpoints and | |
1579 | * continue instead. | |
1580 | */ | |
1581 | if (gdbstub_single_step(regs) < 0) | |
1582 | /* ignore any fault error for now */ | |
1583 | gdbstub_printk("unable to set single-step" | |
1584 | " bp\n"); | |
1585 | goto done; | |
1586 | ||
1587 | /* | |
1588 | * Set baud rate (bBB) | |
1589 | */ | |
1590 | case 'b': | |
1591 | do { | |
1592 | int baudrate; | |
1593 | ||
1594 | ptr = &input_buffer[1]; | |
1595 | if (!hexToInt(&ptr, &baudrate)) { | |
1596 | gdbstub_strcpy(output_buffer, "B01"); | |
1597 | break; | |
1598 | } | |
1599 | ||
1600 | if (baudrate) { | |
1601 | /* ACK before changing speed */ | |
1602 | putpacket("OK"); | |
1603 | gdbstub_io_set_baud(baudrate); | |
1604 | } | |
1605 | } while (0); | |
1606 | break; | |
1607 | ||
1608 | /* | |
1609 | * Set breakpoint | |
1610 | */ | |
1611 | case 'Z': | |
1612 | ptr = &input_buffer[1]; | |
1613 | ||
1614 | if (!hexToInt(&ptr, &loop) || *ptr++ != ',' || | |
1615 | !hexToInt(&ptr, &addr) || *ptr++ != ',' || | |
1616 | !hexToInt(&ptr, &length) | |
1617 | ) { | |
1618 | gdbstub_strcpy(output_buffer, "E01"); | |
1619 | break; | |
1620 | } | |
1621 | ||
1622 | /* only support software breakpoints */ | |
1623 | gdbstub_strcpy(output_buffer, "E03"); | |
1624 | if (loop != 0 || | |
1625 | length < 1 || | |
1626 | length > 7 || | |
1627 | (unsigned long) addr < 4096) | |
1628 | break; | |
1629 | ||
1630 | if (gdbstub_set_breakpoint((u8 *) addr, length) < 0) | |
1631 | break; | |
1632 | ||
1633 | gdbstub_strcpy(output_buffer, "OK"); | |
1634 | break; | |
1635 | ||
1636 | /* | |
1637 | * Clear breakpoint | |
1638 | */ | |
1639 | case 'z': | |
1640 | ptr = &input_buffer[1]; | |
1641 | ||
1642 | if (!hexToInt(&ptr, &loop) || *ptr++ != ',' || | |
1643 | !hexToInt(&ptr, &addr) || *ptr++ != ',' || | |
1644 | !hexToInt(&ptr, &length) | |
1645 | ) { | |
1646 | gdbstub_strcpy(output_buffer, "E01"); | |
1647 | break; | |
1648 | } | |
1649 | ||
1650 | /* only support software breakpoints */ | |
1651 | gdbstub_strcpy(output_buffer, "E03"); | |
1652 | if (loop != 0 || | |
1653 | length < 1 || | |
1654 | length > 7 || | |
1655 | (unsigned long) addr < 4096) | |
1656 | break; | |
1657 | ||
1658 | if (gdbstub_clear_breakpoint((u8 *) addr, length) < 0) | |
1659 | break; | |
1660 | ||
1661 | gdbstub_strcpy(output_buffer, "OK"); | |
1662 | break; | |
1663 | ||
1664 | default: | |
1665 | gdbstub_proto("### GDB Unsupported Cmd '%s'\n", | |
1666 | input_buffer); | |
1667 | break; | |
1668 | } | |
1669 | ||
1670 | /* reply to the request */ | |
1671 | putpacket(output_buffer); | |
1672 | } | |
1673 | ||
1674 | done: | |
1675 | /* | |
1676 | * Need to flush the instruction cache here, as we may | |
1677 | * have deposited a breakpoint, and the icache probably | |
1678 | * has no way of knowing that a data ref to some location | |
1679 | * may have changed something that is in the instruction | |
1680 | * cache. | |
1681 | * NB: We flush both caches, just to be sure... | |
1682 | */ | |
1683 | if (gdbstub_flush_caches) | |
1684 | gdbstub_purge_cache(); | |
1685 | ||
1686 | gdbstub_load_fpu(); | |
1687 | mn10300_set_gdbleds(0); | |
1688 | if (excep == EXCEP_NMI) | |
1689 | NMICR = NMICR_NMIF; | |
1690 | ||
1691 | touch_softlockup_watchdog(); | |
1692 | ||
1693 | local_irq_restore(epsw); | |
1694 | return 1; | |
1695 | } | |
1696 | ||
1697 | /* | |
1698 | * handle event interception | |
1699 | */ | |
1700 | asmlinkage int gdbstub_intercept(struct pt_regs *regs, | |
1701 | enum exception_code excep) | |
1702 | { | |
1703 | static u8 notfirst = 1; | |
1704 | int ret; | |
1705 | ||
1706 | if (gdbstub_busy) | |
1707 | gdbstub_printk("--> gdbstub reentered itself\n"); | |
1708 | gdbstub_busy = 1; | |
1709 | ||
1710 | if (notfirst) { | |
1711 | unsigned long mdr; | |
1712 | asm("mov mdr,%0" : "=d"(mdr)); | |
1713 | ||
1714 | gdbstub_entry( | |
1715 | "--> gdbstub_intercept(%p,%04x) [MDR=%lx PC=%lx]\n", | |
1716 | regs, excep, mdr, regs->pc); | |
1717 | ||
1718 | gdbstub_entry( | |
1719 | "PC: %08lx EPSW: %08lx SSP: %08lx mode: %s\n", | |
1720 | regs->pc, regs->epsw, (unsigned long) &ret, | |
1721 | user_mode(regs) ? "User" : "Super"); | |
1722 | gdbstub_entry( | |
1723 | "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n", | |
1724 | regs->d0, regs->d1, regs->d2, regs->d3); | |
1725 | gdbstub_entry( | |
1726 | "a0: %08lx a1: %08lx a2: %08lx a3: %08lx\n", | |
1727 | regs->a0, regs->a1, regs->a2, regs->a3); | |
1728 | gdbstub_entry( | |
1729 | "e0: %08lx e1: %08lx e2: %08lx e3: %08lx\n", | |
1730 | regs->e0, regs->e1, regs->e2, regs->e3); | |
1731 | gdbstub_entry( | |
1732 | "e4: %08lx e5: %08lx e6: %08lx e7: %08lx\n", | |
1733 | regs->e4, regs->e5, regs->e6, regs->e7); | |
1734 | gdbstub_entry( | |
1735 | "lar: %08lx lir: %08lx mdr: %08lx usp: %08lx\n", | |
1736 | regs->lar, regs->lir, regs->mdr, regs->sp); | |
1737 | gdbstub_entry( | |
1738 | "cvf: %08lx crl: %08lx crh: %08lx drq: %08lx\n", | |
1739 | regs->mcvf, regs->mcrl, regs->mcrh, regs->mdrq); | |
1740 | gdbstub_entry( | |
1741 | "threadinfo=%p task=%p)\n", | |
1742 | current_thread_info(), current); | |
1743 | } else { | |
1744 | notfirst = 1; | |
1745 | } | |
1746 | ||
1747 | ret = gdbstub(regs, excep); | |
1748 | ||
1749 | gdbstub_entry("<-- gdbstub_intercept()\n"); | |
1750 | gdbstub_busy = 0; | |
1751 | return ret; | |
1752 | } | |
1753 | ||
1754 | /* | |
1755 | * handle the GDB stub itself causing an exception | |
1756 | */ | |
1757 | asmlinkage void gdbstub_exception(struct pt_regs *regs, | |
1758 | enum exception_code excep) | |
1759 | { | |
1760 | unsigned long mdr; | |
1761 | ||
1762 | asm("mov mdr,%0" : "=d"(mdr)); | |
1763 | gdbstub_entry("--> gdbstub exception({%p},%04x) [MDR=%lx]\n", | |
1764 | regs, excep, mdr); | |
1765 | ||
1766 | while ((unsigned long) regs == 0xffffffff) {} | |
1767 | ||
1768 | /* handle guarded memory accesses where we know it might fault */ | |
1769 | if (regs->pc == (unsigned) gdbstub_read_byte_guard) { | |
1770 | regs->pc = (unsigned) gdbstub_read_byte_cont; | |
1771 | goto fault; | |
1772 | } | |
1773 | ||
1774 | if (regs->pc == (unsigned) gdbstub_read_word_guard) { | |
1775 | regs->pc = (unsigned) gdbstub_read_word_cont; | |
1776 | goto fault; | |
1777 | } | |
1778 | ||
1779 | if (regs->pc == (unsigned) gdbstub_read_dword_guard) { | |
1780 | regs->pc = (unsigned) gdbstub_read_dword_cont; | |
1781 | goto fault; | |
1782 | } | |
1783 | ||
1784 | if (regs->pc == (unsigned) gdbstub_write_byte_guard) { | |
1785 | regs->pc = (unsigned) gdbstub_write_byte_cont; | |
1786 | goto fault; | |
1787 | } | |
1788 | ||
1789 | if (regs->pc == (unsigned) gdbstub_write_word_guard) { | |
1790 | regs->pc = (unsigned) gdbstub_write_word_cont; | |
1791 | goto fault; | |
1792 | } | |
1793 | ||
1794 | if (regs->pc == (unsigned) gdbstub_write_dword_guard) { | |
1795 | regs->pc = (unsigned) gdbstub_write_dword_cont; | |
1796 | goto fault; | |
1797 | } | |
1798 | ||
1799 | gdbstub_printk("\n### GDB stub caused an exception ###\n"); | |
1800 | ||
1801 | /* something went horribly wrong */ | |
1802 | console_verbose(); | |
1803 | show_registers(regs); | |
1804 | ||
1805 | panic("GDB Stub caused an unexpected exception - can't continue\n"); | |
1806 | ||
1807 | /* we caught an attempt by the stub to access silly memory */ | |
1808 | fault: | |
1809 | gdbstub_entry("<-- gdbstub exception() = EFAULT\n"); | |
1810 | regs->d0 = -EFAULT; | |
1811 | return; | |
1812 | } | |
1813 | ||
1814 | /* | |
1815 | * send an exit message to GDB | |
1816 | */ | |
1817 | void gdbstub_exit(int status) | |
1818 | { | |
1819 | unsigned char checksum; | |
1820 | unsigned char ch; | |
1821 | int count; | |
1822 | ||
1823 | gdbstub_busy = 1; | |
1824 | output_buffer[0] = 'W'; | |
26824972 HH |
1825 | output_buffer[1] = hex_asc_hi(status); |
1826 | output_buffer[2] = hex_asc_lo(status); | |
b920de1b DH |
1827 | output_buffer[3] = 0; |
1828 | ||
1829 | gdbstub_io_tx_char('$'); | |
1830 | checksum = 0; | |
1831 | count = 0; | |
1832 | ||
1833 | while ((ch = output_buffer[count]) != 0) { | |
1834 | gdbstub_io_tx_char(ch); | |
1835 | checksum += ch; | |
1836 | count += 1; | |
1837 | } | |
1838 | ||
1839 | gdbstub_io_tx_char('#'); | |
26824972 HH |
1840 | gdbstub_io_tx_char(hex_asc_hi(checksum)); |
1841 | gdbstub_io_tx_char(hex_asc_lo(checksum)); | |
b920de1b DH |
1842 | |
1843 | /* make sure the output is flushed, or else RedBoot might clobber it */ | |
1844 | gdbstub_io_tx_flush(); | |
1845 | ||
1846 | gdbstub_busy = 0; | |
1847 | } | |
1848 | ||
1849 | /* | |
1850 | * initialise the GDB stub | |
1851 | */ | |
1852 | asmlinkage void __init gdbstub_init(void) | |
1853 | { | |
1854 | #ifdef CONFIG_GDBSTUB_IMMEDIATE | |
1855 | unsigned char ch; | |
1856 | int ret; | |
1857 | #endif | |
1858 | ||
1859 | gdbstub_busy = 1; | |
1860 | ||
1861 | printk(KERN_INFO "%s", gdbstub_banner); | |
1862 | ||
1863 | gdbstub_io_init(); | |
1864 | ||
1865 | gdbstub_entry("--> gdbstub_init\n"); | |
1866 | ||
1867 | /* try to talk to GDB (or anyone insane enough to want to type GDB | |
1868 | * protocol by hand) */ | |
1869 | gdbstub_io("### GDB Tx ACK\n"); | |
1870 | gdbstub_io_tx_char('+'); /* 'hello world' */ | |
1871 | ||
1872 | #ifdef CONFIG_GDBSTUB_IMMEDIATE | |
1873 | gdbstub_printk("GDB Stub waiting for packet\n"); | |
1874 | ||
1875 | /* in case GDB is started before us, ACK any packets that are already | |
1876 | * sitting there (presumably "$?#xx") | |
1877 | */ | |
1878 | do { gdbstub_io_rx_char(&ch, 0); } while (ch != '$'); | |
1879 | do { gdbstub_io_rx_char(&ch, 0); } while (ch != '#'); | |
1880 | /* eat first csum byte */ | |
1881 | do { ret = gdbstub_io_rx_char(&ch, 0); } while (ret != 0); | |
1882 | /* eat second csum byte */ | |
1883 | do { ret = gdbstub_io_rx_char(&ch, 0); } while (ret != 0); | |
1884 | ||
1885 | gdbstub_io("### GDB Tx NAK\n"); | |
1886 | gdbstub_io_tx_char('-'); /* NAK it */ | |
1887 | ||
1888 | #else | |
1889 | printk("GDB Stub ready\n"); | |
1890 | #endif | |
1891 | ||
1892 | gdbstub_busy = 0; | |
1893 | gdbstub_entry("<-- gdbstub_init\n"); | |
1894 | } | |
1895 | ||
1896 | /* | |
1897 | * register the console at a more appropriate time | |
1898 | */ | |
1899 | #ifdef CONFIG_GDBSTUB_CONSOLE | |
1900 | static int __init gdbstub_postinit(void) | |
1901 | { | |
1902 | printk(KERN_NOTICE "registering console\n"); | |
1903 | register_console(&gdbstub_console); | |
1904 | return 0; | |
1905 | } | |
1906 | ||
1907 | __initcall(gdbstub_postinit); | |
1908 | #endif | |
1909 | ||
1910 | /* | |
1911 | * handle character reception on GDB serial port | |
1912 | * - jump into the GDB stub if BREAK is detected on the serial line | |
1913 | */ | |
1914 | asmlinkage void gdbstub_rx_irq(struct pt_regs *regs, enum exception_code excep) | |
1915 | { | |
1916 | char ch; | |
1917 | int ret; | |
1918 | ||
1919 | gdbstub_entry("--> gdbstub_rx_irq\n"); | |
1920 | ||
1921 | do { | |
1922 | ret = gdbstub_io_rx_char(&ch, 1); | |
1923 | if (ret != -EIO && ret != -EAGAIN) { | |
1924 | if (ret != -EINTR) | |
1925 | gdbstub_rx_unget = ch; | |
1926 | gdbstub(regs, excep); | |
1927 | } | |
1928 | } while (ret != -EAGAIN); | |
1929 | ||
1930 | gdbstub_entry("<-- gdbstub_rx_irq\n"); | |
1931 | } |