Commit | Line | Data |
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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) */ | |
499c59c4 | 525 | case 0xc0 ... 0xca: |
b920de1b DH |
526 | if (gdbstub_read_byte(pc + 1, (u8 *) &x) < 0) |
527 | goto fault; | |
528 | if (!__gdbstub_mark_bp(pc + 2, 0)) | |
529 | goto fault; | |
530 | if ((x < 0 || x > 2) && | |
531 | !__gdbstub_mark_bp(pc + (s8) x, 1)) | |
532 | goto fault; | |
533 | break; | |
534 | ||
535 | /* LXX (d8,PC) */ | |
499c59c4 | 536 | case 0xd0 ... 0xda: |
b920de1b DH |
537 | if (!__gdbstub_mark_bp(pc + 1, 0)) |
538 | goto fault; | |
539 | if (regs->pc != regs->lar && | |
540 | !__gdbstub_mark_bp((u8 *) regs->lar, 1)) | |
541 | goto fault; | |
542 | break; | |
543 | ||
544 | /* SETLB - loads the next for bytes into the LIR | |
545 | * register */ | |
546 | case 0xdb: | |
547 | if (!__gdbstub_mark_bp(pc + 1, 0)) | |
548 | goto fault; | |
549 | break; | |
550 | ||
551 | /* JMP (d16,PC) or CALL (d16,PC) */ | |
552 | case 0xcc: | |
553 | case 0xcd: | |
554 | if (gdbstub_read_byte(pc + 1, ((u8 *) &x) + 0) < 0 || | |
555 | gdbstub_read_byte(pc + 2, ((u8 *) &x) + 1) < 0) | |
556 | goto fault; | |
557 | if (!__gdbstub_mark_bp(pc + (s16) x, 0)) | |
558 | goto fault; | |
559 | break; | |
560 | ||
561 | /* JMP (d32,PC) or CALL (d32,PC) */ | |
562 | case 0xdc: | |
563 | case 0xdd: | |
564 | if (gdbstub_read_byte(pc + 1, ((u8 *) &x) + 0) < 0 || | |
565 | gdbstub_read_byte(pc + 2, ((u8 *) &x) + 1) < 0 || | |
566 | gdbstub_read_byte(pc + 3, ((u8 *) &x) + 2) < 0 || | |
567 | gdbstub_read_byte(pc + 4, ((u8 *) &x) + 3) < 0) | |
568 | goto fault; | |
569 | if (!__gdbstub_mark_bp(pc + (s32) x, 0)) | |
570 | goto fault; | |
571 | break; | |
572 | ||
573 | /* RETF */ | |
574 | case 0xde: | |
575 | if (!__gdbstub_mark_bp((u8 *) regs->mdr, 0)) | |
576 | goto fault; | |
577 | break; | |
578 | ||
579 | /* RET */ | |
580 | case 0xdf: | |
581 | if (gdbstub_read_byte(pc + 2, (u8 *) &x) < 0) | |
582 | goto fault; | |
583 | sp += (s8)x; | |
584 | if (gdbstub_read_byte(sp + 0, ((u8 *) &x) + 0) < 0 || | |
585 | gdbstub_read_byte(sp + 1, ((u8 *) &x) + 1) < 0 || | |
586 | gdbstub_read_byte(sp + 2, ((u8 *) &x) + 2) < 0 || | |
587 | gdbstub_read_byte(sp + 3, ((u8 *) &x) + 3) < 0) | |
588 | goto fault; | |
589 | if (!__gdbstub_mark_bp((u8 *) x, 0)) | |
590 | goto fault; | |
591 | break; | |
592 | ||
593 | case 0xf0: | |
594 | if (gdbstub_read_byte(pc + 1, &cur) < 0) | |
595 | goto fault; | |
596 | ||
597 | if (cur >= 0xf0 && cur <= 0xf7) { | |
598 | /* JMP (An) / CALLS (An) */ | |
599 | switch (cur & 3) { | |
600 | case 0: x = regs->a0; break; | |
601 | case 1: x = regs->a1; break; | |
602 | case 2: x = regs->a2; break; | |
603 | case 3: x = regs->a3; break; | |
604 | } | |
605 | if (!__gdbstub_mark_bp((u8 *) x, 0)) | |
606 | goto fault; | |
607 | } else if (cur == 0xfc) { | |
608 | /* RETS */ | |
609 | if (gdbstub_read_byte( | |
610 | sp + 0, ((u8 *) &x) + 0) < 0 || | |
611 | gdbstub_read_byte( | |
612 | sp + 1, ((u8 *) &x) + 1) < 0 || | |
613 | gdbstub_read_byte( | |
614 | sp + 2, ((u8 *) &x) + 2) < 0 || | |
615 | gdbstub_read_byte( | |
616 | sp + 3, ((u8 *) &x) + 3) < 0) | |
617 | goto fault; | |
618 | if (!__gdbstub_mark_bp((u8 *) x, 0)) | |
619 | goto fault; | |
620 | } else if (cur == 0xfd) { | |
621 | /* RTI */ | |
622 | if (gdbstub_read_byte( | |
623 | sp + 4, ((u8 *) &x) + 0) < 0 || | |
624 | gdbstub_read_byte( | |
625 | sp + 5, ((u8 *) &x) + 1) < 0 || | |
626 | gdbstub_read_byte( | |
627 | sp + 6, ((u8 *) &x) + 2) < 0 || | |
628 | gdbstub_read_byte( | |
629 | sp + 7, ((u8 *) &x) + 3) < 0) | |
630 | goto fault; | |
631 | if (!__gdbstub_mark_bp((u8 *) x, 0)) | |
632 | goto fault; | |
633 | } else { | |
634 | if (!__gdbstub_mark_bp(pc + 2, 0)) | |
635 | goto fault; | |
636 | } | |
637 | ||
638 | break; | |
639 | ||
640 | /* potential 3-byte conditional branches */ | |
641 | case 0xf8: | |
642 | if (gdbstub_read_byte(pc + 1, &cur) < 0) | |
643 | goto fault; | |
644 | if (!__gdbstub_mark_bp(pc + 3, 0)) | |
645 | goto fault; | |
646 | ||
647 | if (cur >= 0xe8 && cur <= 0xeb) { | |
648 | if (gdbstub_read_byte( | |
649 | pc + 2, ((u8 *) &x) + 0) < 0) | |
650 | goto fault; | |
651 | if ((x < 0 || x > 3) && | |
652 | !__gdbstub_mark_bp(pc + (s8) x, 1)) | |
653 | goto fault; | |
654 | } | |
655 | break; | |
656 | ||
657 | case 0xfa: | |
658 | if (gdbstub_read_byte(pc + 1, &cur) < 0) | |
659 | goto fault; | |
660 | ||
661 | if (cur == 0xff) { | |
662 | /* CALLS (d16,PC) */ | |
663 | if (gdbstub_read_byte( | |
664 | pc + 2, ((u8 *) &x) + 0) < 0 || | |
665 | gdbstub_read_byte( | |
666 | pc + 3, ((u8 *) &x) + 1) < 0) | |
667 | goto fault; | |
668 | if (!__gdbstub_mark_bp(pc + (s16) x, 0)) | |
669 | goto fault; | |
670 | } else { | |
671 | if (!__gdbstub_mark_bp(pc + 4, 0)) | |
672 | goto fault; | |
673 | } | |
674 | break; | |
675 | ||
676 | case 0xfc: | |
677 | if (gdbstub_read_byte(pc + 1, &cur) < 0) | |
678 | goto fault; | |
679 | if (cur == 0xff) { | |
680 | /* CALLS (d32,PC) */ | |
681 | if (gdbstub_read_byte( | |
682 | pc + 2, ((u8 *) &x) + 0) < 0 || | |
683 | gdbstub_read_byte( | |
684 | pc + 3, ((u8 *) &x) + 1) < 0 || | |
685 | gdbstub_read_byte( | |
686 | pc + 4, ((u8 *) &x) + 2) < 0 || | |
687 | gdbstub_read_byte( | |
688 | pc + 5, ((u8 *) &x) + 3) < 0) | |
689 | goto fault; | |
690 | if (!__gdbstub_mark_bp( | |
691 | pc + (s32) x, 0)) | |
692 | goto fault; | |
693 | } else { | |
694 | if (!__gdbstub_mark_bp( | |
695 | pc + 6, 0)) | |
696 | goto fault; | |
697 | } | |
698 | break; | |
699 | ||
700 | } | |
701 | } | |
702 | ||
703 | gdbstub_bkpt("Step: %02x at %p; %02x at %p\n", | |
704 | step_bp[0].opcode[0], step_bp[0].addr, | |
705 | step_bp[1].opcode[0], step_bp[1].addr); | |
706 | ||
707 | if (step_bp[0].addr) { | |
708 | #ifdef GDBSTUB_USE_F7F7_AS_BREAKPOINT | |
709 | if (gdbstub_write_byte(0xF7, step_bp[0].addr + 0) < 0 || | |
710 | gdbstub_write_byte(0xF7, step_bp[0].addr + 1) < 0) | |
711 | goto fault; | |
712 | #else | |
713 | if (gdbstub_write_byte(0xFF, step_bp[0].addr + 0) < 0) | |
714 | goto fault; | |
715 | #endif | |
716 | } | |
717 | ||
718 | if (step_bp[1].addr) { | |
719 | #ifdef GDBSTUB_USE_F7F7_AS_BREAKPOINT | |
720 | if (gdbstub_write_byte(0xF7, step_bp[1].addr + 0) < 0 || | |
721 | gdbstub_write_byte(0xF7, step_bp[1].addr + 1) < 0) | |
722 | goto fault; | |
723 | #else | |
724 | if (gdbstub_write_byte(0xFF, step_bp[1].addr + 0) < 0) | |
725 | goto fault; | |
726 | #endif | |
727 | } | |
728 | ||
729 | return 0; | |
730 | ||
731 | fault: | |
732 | /* uh-oh - silly address alert, try and restore things */ | |
733 | __gdbstub_restore_bp(); | |
734 | return -EFAULT; | |
735 | } | |
736 | ||
737 | #ifdef CONFIG_GDBSTUB_CONSOLE | |
738 | ||
739 | void gdbstub_console_write(struct console *con, const char *p, unsigned n) | |
740 | { | |
741 | static const char gdbstub_cr[] = { 0x0d }; | |
742 | char outbuf[26]; | |
743 | int qty; | |
744 | u8 busy; | |
745 | ||
746 | busy = gdbstub_busy; | |
747 | gdbstub_busy = 1; | |
748 | ||
749 | outbuf[0] = 'O'; | |
750 | ||
751 | while (n > 0) { | |
752 | qty = 1; | |
753 | ||
754 | while (n > 0 && qty < 20) { | |
755 | mem2hex(p, outbuf + qty, 2, 0); | |
756 | qty += 2; | |
757 | if (*p == 0x0a) { | |
758 | mem2hex(gdbstub_cr, outbuf + qty, 2, 0); | |
759 | qty += 2; | |
760 | } | |
761 | p++; | |
762 | n--; | |
763 | } | |
764 | ||
765 | outbuf[qty] = 0; | |
766 | putpacket(outbuf); | |
767 | } | |
768 | ||
769 | gdbstub_busy = busy; | |
770 | } | |
771 | ||
772 | static kdev_t gdbstub_console_dev(struct console *con) | |
773 | { | |
774 | return MKDEV(1, 3); /* /dev/null */ | |
775 | } | |
776 | ||
777 | static struct console gdbstub_console = { | |
778 | .name = "gdb", | |
779 | .write = gdbstub_console_write, | |
780 | .device = gdbstub_console_dev, | |
781 | .flags = CON_PRINTBUFFER, | |
782 | .index = -1, | |
783 | }; | |
784 | ||
785 | #endif | |
786 | ||
787 | /* | |
788 | * Convert the memory pointed to by mem into hex, placing result in buf. | |
789 | * - if successful, return a pointer to the last char put in buf (NUL) | |
790 | * - in case of mem fault, return NULL | |
791 | * may_fault is non-zero if we are reading from arbitrary memory, but is | |
792 | * currently not used. | |
793 | */ | |
794 | static | |
795 | unsigned char *mem2hex(const void *_mem, char *buf, int count, int may_fault) | |
796 | { | |
797 | const u8 *mem = _mem; | |
798 | u8 ch[4]; | |
799 | ||
800 | if ((u32) mem & 1 && count >= 1) { | |
801 | if (gdbstub_read_byte(mem, ch) != 0) | |
802 | return 0; | |
26824972 | 803 | buf = pack_hex_byte(buf, ch[0]); |
b920de1b DH |
804 | mem++; |
805 | count--; | |
806 | } | |
807 | ||
808 | if ((u32) mem & 3 && count >= 2) { | |
809 | if (gdbstub_read_word(mem, ch) != 0) | |
810 | return 0; | |
26824972 HH |
811 | buf = pack_hex_byte(buf, ch[0]); |
812 | buf = pack_hex_byte(buf, ch[1]); | |
b920de1b DH |
813 | mem += 2; |
814 | count -= 2; | |
815 | } | |
816 | ||
817 | while (count >= 4) { | |
818 | if (gdbstub_read_dword(mem, ch) != 0) | |
819 | return 0; | |
26824972 HH |
820 | buf = pack_hex_byte(buf, ch[0]); |
821 | buf = pack_hex_byte(buf, ch[1]); | |
822 | buf = pack_hex_byte(buf, ch[2]); | |
823 | buf = pack_hex_byte(buf, ch[3]); | |
b920de1b DH |
824 | mem += 4; |
825 | count -= 4; | |
826 | } | |
827 | ||
828 | if (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 | if (count >= 1) { | |
838 | if (gdbstub_read_byte(mem, ch) != 0) | |
839 | return 0; | |
26824972 | 840 | buf = pack_hex_byte(buf, ch[0]); |
b920de1b DH |
841 | } |
842 | ||
843 | *buf = 0; | |
844 | return buf; | |
845 | } | |
846 | ||
847 | /* | |
848 | * convert the hex array pointed to by buf into binary to be placed in mem | |
849 | * return a pointer to the character AFTER the last byte written | |
850 | * may_fault is non-zero if we are reading from arbitrary memory, but is | |
851 | * currently not used. | |
852 | */ | |
853 | static | |
854 | const char *hex2mem(const char *buf, void *_mem, int count, int may_fault) | |
855 | { | |
856 | u8 *mem = _mem; | |
857 | union { | |
858 | u32 val; | |
859 | u8 b[4]; | |
860 | } ch; | |
861 | ||
862 | if ((u32) mem & 1 && count >= 1) { | |
863 | ch.b[0] = hex(*buf++) << 4; | |
864 | ch.b[0] |= hex(*buf++); | |
865 | if (gdbstub_write_byte(ch.val, mem) != 0) | |
866 | return 0; | |
867 | mem++; | |
868 | count--; | |
869 | } | |
870 | ||
871 | if ((u32) mem & 3 && count >= 2) { | |
872 | ch.b[0] = hex(*buf++) << 4; | |
873 | ch.b[0] |= hex(*buf++); | |
874 | ch.b[1] = hex(*buf++) << 4; | |
875 | ch.b[1] |= hex(*buf++); | |
876 | if (gdbstub_write_word(ch.val, mem) != 0) | |
877 | return 0; | |
878 | mem += 2; | |
879 | count -= 2; | |
880 | } | |
881 | ||
882 | while (count >= 4) { | |
883 | ch.b[0] = hex(*buf++) << 4; | |
884 | ch.b[0] |= hex(*buf++); | |
885 | ch.b[1] = hex(*buf++) << 4; | |
886 | ch.b[1] |= hex(*buf++); | |
887 | ch.b[2] = hex(*buf++) << 4; | |
888 | ch.b[2] |= hex(*buf++); | |
889 | ch.b[3] = hex(*buf++) << 4; | |
890 | ch.b[3] |= hex(*buf++); | |
891 | if (gdbstub_write_dword(ch.val, mem) != 0) | |
892 | return 0; | |
893 | mem += 4; | |
894 | count -= 4; | |
895 | } | |
896 | ||
897 | if (count >= 2) { | |
898 | ch.b[0] = hex(*buf++) << 4; | |
899 | ch.b[0] |= hex(*buf++); | |
900 | ch.b[1] = hex(*buf++) << 4; | |
901 | ch.b[1] |= hex(*buf++); | |
902 | if (gdbstub_write_word(ch.val, mem) != 0) | |
903 | return 0; | |
904 | mem += 2; | |
905 | count -= 2; | |
906 | } | |
907 | ||
908 | if (count >= 1) { | |
909 | ch.b[0] = hex(*buf++) << 4; | |
910 | ch.b[0] |= hex(*buf++); | |
911 | if (gdbstub_write_byte(ch.val, mem) != 0) | |
912 | return 0; | |
913 | } | |
914 | ||
915 | return buf; | |
916 | } | |
917 | ||
918 | /* | |
919 | * This table contains the mapping between MN10300 exception codes, and | |
920 | * signals, which are primarily what GDB understands. It also indicates | |
921 | * which hardware traps we need to commandeer when initializing the stub. | |
922 | */ | |
923 | static const struct excep_to_sig_map { | |
924 | enum exception_code excep; /* MN10300 exception code */ | |
925 | unsigned char signo; /* Signal that we map this into */ | |
926 | } excep_to_sig_map[] = { | |
927 | { EXCEP_ITLBMISS, SIGSEGV }, | |
928 | { EXCEP_DTLBMISS, SIGSEGV }, | |
929 | { EXCEP_TRAP, SIGTRAP }, | |
930 | { EXCEP_ISTEP, SIGTRAP }, | |
931 | { EXCEP_IBREAK, SIGTRAP }, | |
932 | { EXCEP_OBREAK, SIGTRAP }, | |
933 | { EXCEP_UNIMPINS, SIGILL }, | |
934 | { EXCEP_UNIMPEXINS, SIGILL }, | |
935 | { EXCEP_MEMERR, SIGSEGV }, | |
936 | { EXCEP_MISALIGN, SIGSEGV }, | |
937 | { EXCEP_BUSERROR, SIGBUS }, | |
938 | { EXCEP_ILLINSACC, SIGSEGV }, | |
939 | { EXCEP_ILLDATACC, SIGSEGV }, | |
940 | { EXCEP_IOINSACC, SIGSEGV }, | |
941 | { EXCEP_PRIVINSACC, SIGSEGV }, | |
942 | { EXCEP_PRIVDATACC, SIGSEGV }, | |
943 | { EXCEP_FPU_DISABLED, SIGFPE }, | |
944 | { EXCEP_FPU_UNIMPINS, SIGFPE }, | |
945 | { EXCEP_FPU_OPERATION, SIGFPE }, | |
946 | { EXCEP_WDT, SIGALRM }, | |
947 | { EXCEP_NMI, SIGQUIT }, | |
948 | { EXCEP_IRQ_LEVEL0, SIGINT }, | |
949 | { EXCEP_IRQ_LEVEL1, SIGINT }, | |
950 | { EXCEP_IRQ_LEVEL2, SIGINT }, | |
951 | { EXCEP_IRQ_LEVEL3, SIGINT }, | |
952 | { EXCEP_IRQ_LEVEL4, SIGINT }, | |
953 | { EXCEP_IRQ_LEVEL5, SIGINT }, | |
954 | { EXCEP_IRQ_LEVEL6, SIGINT }, | |
955 | { 0, 0} | |
956 | }; | |
957 | ||
958 | /* | |
959 | * convert the MN10300 exception code into a UNIX signal number | |
960 | */ | |
961 | static int computeSignal(enum exception_code excep) | |
962 | { | |
963 | const struct excep_to_sig_map *map; | |
964 | ||
965 | for (map = excep_to_sig_map; map->signo; map++) | |
966 | if (map->excep == excep) | |
967 | return map->signo; | |
968 | ||
969 | return SIGHUP; /* default for things we don't know about */ | |
970 | } | |
971 | ||
972 | static u32 gdbstub_fpcr, gdbstub_fpufs_array[32]; | |
973 | ||
974 | /* | |
975 | * | |
976 | */ | |
977 | static void gdbstub_store_fpu(void) | |
978 | { | |
979 | #ifdef CONFIG_FPU | |
980 | ||
981 | asm volatile( | |
982 | "or %2,epsw\n" | |
983 | #ifdef CONFIG_MN10300_PROC_MN103E010 | |
984 | "nop\n" | |
985 | "nop\n" | |
986 | #endif | |
987 | "mov %1, a1\n" | |
988 | "fmov fs0, (a1+)\n" | |
989 | "fmov fs1, (a1+)\n" | |
990 | "fmov fs2, (a1+)\n" | |
991 | "fmov fs3, (a1+)\n" | |
992 | "fmov fs4, (a1+)\n" | |
993 | "fmov fs5, (a1+)\n" | |
994 | "fmov fs6, (a1+)\n" | |
995 | "fmov fs7, (a1+)\n" | |
996 | "fmov fs8, (a1+)\n" | |
997 | "fmov fs9, (a1+)\n" | |
998 | "fmov fs10, (a1+)\n" | |
999 | "fmov fs11, (a1+)\n" | |
1000 | "fmov fs12, (a1+)\n" | |
1001 | "fmov fs13, (a1+)\n" | |
1002 | "fmov fs14, (a1+)\n" | |
1003 | "fmov fs15, (a1+)\n" | |
1004 | "fmov fs16, (a1+)\n" | |
1005 | "fmov fs17, (a1+)\n" | |
1006 | "fmov fs18, (a1+)\n" | |
1007 | "fmov fs19, (a1+)\n" | |
1008 | "fmov fs20, (a1+)\n" | |
1009 | "fmov fs21, (a1+)\n" | |
1010 | "fmov fs22, (a1+)\n" | |
1011 | "fmov fs23, (a1+)\n" | |
1012 | "fmov fs24, (a1+)\n" | |
1013 | "fmov fs25, (a1+)\n" | |
1014 | "fmov fs26, (a1+)\n" | |
1015 | "fmov fs27, (a1+)\n" | |
1016 | "fmov fs28, (a1+)\n" | |
1017 | "fmov fs29, (a1+)\n" | |
1018 | "fmov fs30, (a1+)\n" | |
1019 | "fmov fs31, (a1+)\n" | |
1020 | "fmov fpcr, %0\n" | |
1021 | : "=d"(gdbstub_fpcr) | |
1022 | : "g" (&gdbstub_fpufs_array), "i"(EPSW_FE) | |
1023 | : "a1" | |
1024 | ); | |
1025 | #endif | |
1026 | } | |
1027 | ||
1028 | /* | |
1029 | * | |
1030 | */ | |
1031 | static void gdbstub_load_fpu(void) | |
1032 | { | |
1033 | #ifdef CONFIG_FPU | |
1034 | ||
1035 | asm volatile( | |
1036 | "or %1,epsw\n" | |
1037 | #ifdef CONFIG_MN10300_PROC_MN103E010 | |
1038 | "nop\n" | |
1039 | "nop\n" | |
1040 | #endif | |
1041 | "mov %0, a1\n" | |
1042 | "fmov (a1+), fs0\n" | |
1043 | "fmov (a1+), fs1\n" | |
1044 | "fmov (a1+), fs2\n" | |
1045 | "fmov (a1+), fs3\n" | |
1046 | "fmov (a1+), fs4\n" | |
1047 | "fmov (a1+), fs5\n" | |
1048 | "fmov (a1+), fs6\n" | |
1049 | "fmov (a1+), fs7\n" | |
1050 | "fmov (a1+), fs8\n" | |
1051 | "fmov (a1+), fs9\n" | |
1052 | "fmov (a1+), fs10\n" | |
1053 | "fmov (a1+), fs11\n" | |
1054 | "fmov (a1+), fs12\n" | |
1055 | "fmov (a1+), fs13\n" | |
1056 | "fmov (a1+), fs14\n" | |
1057 | "fmov (a1+), fs15\n" | |
1058 | "fmov (a1+), fs16\n" | |
1059 | "fmov (a1+), fs17\n" | |
1060 | "fmov (a1+), fs18\n" | |
1061 | "fmov (a1+), fs19\n" | |
1062 | "fmov (a1+), fs20\n" | |
1063 | "fmov (a1+), fs21\n" | |
1064 | "fmov (a1+), fs22\n" | |
1065 | "fmov (a1+), fs23\n" | |
1066 | "fmov (a1+), fs24\n" | |
1067 | "fmov (a1+), fs25\n" | |
1068 | "fmov (a1+), fs26\n" | |
1069 | "fmov (a1+), fs27\n" | |
1070 | "fmov (a1+), fs28\n" | |
1071 | "fmov (a1+), fs29\n" | |
1072 | "fmov (a1+), fs30\n" | |
1073 | "fmov (a1+), fs31\n" | |
1074 | "fmov %2, fpcr\n" | |
1075 | : | |
1076 | : "g" (&gdbstub_fpufs_array), "i"(EPSW_FE), "d"(gdbstub_fpcr) | |
1077 | : "a1" | |
1078 | ); | |
1079 | #endif | |
1080 | } | |
1081 | ||
1082 | /* | |
1083 | * set a software breakpoint | |
1084 | */ | |
1085 | int gdbstub_set_breakpoint(u8 *addr, int len) | |
1086 | { | |
1087 | int bkpt, loop, xloop; | |
1088 | ||
1089 | #ifdef GDBSTUB_USE_F7F7_AS_BREAKPOINT | |
1090 | len = (len + 1) & ~1; | |
1091 | #endif | |
1092 | ||
1093 | gdbstub_bkpt("setbkpt(%p,%d)\n", addr, len); | |
1094 | ||
1095 | for (bkpt = 255; bkpt >= 0; bkpt--) | |
1096 | if (!gdbstub_bkpts[bkpt].addr) | |
1097 | break; | |
1098 | if (bkpt < 0) | |
1099 | return -ENOSPC; | |
1100 | ||
1101 | for (loop = 0; loop < len; loop++) | |
1102 | if (gdbstub_read_byte(&addr[loop], | |
1103 | &gdbstub_bkpts[bkpt].origbytes[loop] | |
1104 | ) < 0) | |
1105 | return -EFAULT; | |
1106 | ||
1107 | gdbstub_flush_caches = 1; | |
1108 | ||
1109 | #ifdef GDBSTUB_USE_F7F7_AS_BREAKPOINT | |
1110 | for (loop = 0; loop < len; loop++) | |
1111 | if (gdbstub_write_byte(0xF7, &addr[loop]) < 0) | |
1112 | goto restore; | |
1113 | #else | |
1114 | for (loop = 0; loop < len; loop++) | |
1115 | if (gdbstub_write_byte(0xFF, &addr[loop]) < 0) | |
1116 | goto restore; | |
1117 | #endif | |
1118 | ||
1119 | gdbstub_bkpts[bkpt].addr = addr; | |
1120 | gdbstub_bkpts[bkpt].len = len; | |
1121 | ||
1122 | gdbstub_bkpt("Set BKPT[%02x]: %p-%p {%02x%02x%02x%02x%02x%02x%02x}\n", | |
1123 | bkpt, | |
1124 | gdbstub_bkpts[bkpt].addr, | |
1125 | gdbstub_bkpts[bkpt].addr + gdbstub_bkpts[bkpt].len - 1, | |
1126 | gdbstub_bkpts[bkpt].origbytes[0], | |
1127 | gdbstub_bkpts[bkpt].origbytes[1], | |
1128 | gdbstub_bkpts[bkpt].origbytes[2], | |
1129 | gdbstub_bkpts[bkpt].origbytes[3], | |
1130 | gdbstub_bkpts[bkpt].origbytes[4], | |
1131 | gdbstub_bkpts[bkpt].origbytes[5], | |
1132 | gdbstub_bkpts[bkpt].origbytes[6] | |
1133 | ); | |
1134 | ||
1135 | return 0; | |
1136 | ||
1137 | restore: | |
1138 | for (xloop = 0; xloop < loop; xloop++) | |
1139 | gdbstub_write_byte(gdbstub_bkpts[bkpt].origbytes[xloop], | |
1140 | addr + xloop); | |
1141 | return -EFAULT; | |
1142 | } | |
1143 | ||
1144 | /* | |
1145 | * clear a software breakpoint | |
1146 | */ | |
1147 | int gdbstub_clear_breakpoint(u8 *addr, int len) | |
1148 | { | |
1149 | int bkpt, loop; | |
1150 | ||
1151 | #ifdef GDBSTUB_USE_F7F7_AS_BREAKPOINT | |
1152 | len = (len + 1) & ~1; | |
1153 | #endif | |
1154 | ||
1155 | gdbstub_bkpt("clearbkpt(%p,%d)\n", addr, len); | |
1156 | ||
1157 | for (bkpt = 255; bkpt >= 0; bkpt--) | |
1158 | if (gdbstub_bkpts[bkpt].addr == addr && | |
1159 | gdbstub_bkpts[bkpt].len == len) | |
1160 | break; | |
1161 | if (bkpt < 0) | |
1162 | return -ENOENT; | |
1163 | ||
1164 | gdbstub_bkpts[bkpt].addr = NULL; | |
1165 | ||
1166 | gdbstub_flush_caches = 1; | |
1167 | ||
1168 | for (loop = 0; loop < len; loop++) | |
1169 | if (gdbstub_write_byte(gdbstub_bkpts[bkpt].origbytes[loop], | |
1170 | addr + loop) < 0) | |
1171 | return -EFAULT; | |
1172 | ||
1173 | return 0; | |
1174 | } | |
1175 | ||
1176 | /* | |
1177 | * This function does all command processing for interfacing to gdb | |
1178 | * - returns 1 if the exception should be skipped, 0 otherwise. | |
1179 | */ | |
1180 | static int gdbstub(struct pt_regs *regs, enum exception_code excep) | |
1181 | { | |
1182 | unsigned long *stack; | |
1183 | unsigned long epsw, mdr; | |
1184 | uint32_t zero, ssp; | |
1185 | uint8_t broke; | |
1186 | char *ptr; | |
1187 | int sigval; | |
1188 | int addr; | |
1189 | int length; | |
1190 | int loop; | |
1191 | ||
1192 | if (excep == EXCEP_FPU_DISABLED) | |
1193 | return 0; | |
1194 | ||
1195 | gdbstub_flush_caches = 0; | |
1196 | ||
1197 | mn10300_set_gdbleds(1); | |
1198 | ||
1199 | asm volatile("mov mdr,%0" : "=d"(mdr)); | |
1200 | asm volatile("mov epsw,%0" : "=d"(epsw)); | |
1201 | asm volatile("mov %0,epsw" | |
1202 | :: "d"((epsw & ~EPSW_IM) | EPSW_IE | EPSW_IM_1)); | |
1203 | ||
1204 | gdbstub_store_fpu(); | |
1205 | ||
1206 | #ifdef CONFIG_GDBSTUB_IMMEDIATE | |
1207 | /* skip the initial pause loop */ | |
1208 | if (regs->pc == (unsigned long) __gdbstub_pause) | |
1209 | regs->pc = (unsigned long) start_kernel; | |
1210 | #endif | |
1211 | ||
1212 | /* if we were single stepping, restore the opcodes hoisted for the | |
1213 | * breakpoint[s] */ | |
1214 | broke = 0; | |
1215 | if ((step_bp[0].addr && step_bp[0].addr == (u8 *) regs->pc) || | |
1216 | (step_bp[1].addr && step_bp[1].addr == (u8 *) regs->pc)) | |
1217 | broke = 1; | |
1218 | ||
1219 | __gdbstub_restore_bp(); | |
1220 | ||
1221 | if (gdbstub_rx_unget) { | |
1222 | sigval = SIGINT; | |
1223 | if (gdbstub_rx_unget != 3) | |
1224 | goto packet_waiting; | |
1225 | gdbstub_rx_unget = 0; | |
1226 | } | |
1227 | ||
1228 | stack = (unsigned long *) regs->sp; | |
1229 | sigval = broke ? SIGTRAP : computeSignal(excep); | |
1230 | ||
1231 | /* send information about a BUG() */ | |
1232 | if (!user_mode(regs) && excep == EXCEP_SYSCALL15) { | |
1233 | const struct bug_entry *bug; | |
1234 | ||
1235 | bug = find_bug(regs->pc); | |
1236 | if (bug) | |
1237 | goto found_bug; | |
1238 | length = snprintf(trans_buffer, sizeof(trans_buffer), | |
1239 | "BUG() at address %lx\n", regs->pc); | |
1240 | goto send_bug_pkt; | |
1241 | ||
1242 | found_bug: | |
1243 | length = snprintf(trans_buffer, sizeof(trans_buffer), | |
1244 | "BUG() at address %lx (%s:%d)\n", | |
1245 | regs->pc, bug->file, bug->line); | |
1246 | ||
1247 | send_bug_pkt: | |
1248 | ptr = output_buffer; | |
1249 | *ptr++ = 'O'; | |
1250 | ptr = mem2hex(trans_buffer, ptr, length, 0); | |
1251 | *ptr = 0; | |
1252 | putpacket(output_buffer); | |
1253 | ||
1254 | regs->pc -= 2; | |
1255 | sigval = SIGABRT; | |
1256 | } else if (regs->pc == (unsigned long) __gdbstub_bug_trap) { | |
1257 | regs->pc = regs->mdr; | |
1258 | sigval = SIGABRT; | |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * send a message to the debugger's user saying what happened if it may | |
1263 | * not be clear cut (we can't map exceptions onto signals properly) | |
1264 | */ | |
1265 | if (sigval != SIGINT && sigval != SIGTRAP && sigval != SIGILL) { | |
1266 | static const char title[] = "Excep ", tbcberr[] = "BCBERR "; | |
1267 | static const char crlf[] = "\r\n"; | |
1268 | char hx; | |
1269 | u32 bcberr = BCBERR; | |
1270 | ||
1271 | ptr = output_buffer; | |
1272 | *ptr++ = 'O'; | |
1273 | ptr = mem2hex(title, ptr, sizeof(title) - 1, 0); | |
1274 | ||
26824972 HH |
1275 | hx = hex_asc_hi(excep >> 8); |
1276 | ptr = pack_hex_byte(ptr, hx); | |
1277 | hx = hex_asc_lo(excep >> 8); | |
1278 | ptr = pack_hex_byte(ptr, hx); | |
1279 | hx = hex_asc_hi(excep); | |
1280 | ptr = pack_hex_byte(ptr, hx); | |
1281 | hx = hex_asc_lo(excep); | |
1282 | ptr = pack_hex_byte(ptr, hx); | |
b920de1b DH |
1283 | |
1284 | ptr = mem2hex(crlf, ptr, sizeof(crlf) - 1, 0); | |
1285 | *ptr = 0; | |
1286 | putpacket(output_buffer); /* send it off... */ | |
1287 | ||
1288 | /* BCBERR */ | |
1289 | ptr = output_buffer; | |
1290 | *ptr++ = 'O'; | |
1291 | ptr = mem2hex(tbcberr, ptr, sizeof(tbcberr) - 1, 0); | |
1292 | ||
26824972 HH |
1293 | hx = hex_asc_hi(bcberr >> 24); |
1294 | ptr = pack_hex_byte(ptr, hx); | |
1295 | hx = hex_asc_lo(bcberr >> 24); | |
1296 | ptr = pack_hex_byte(ptr, hx); | |
1297 | hx = hex_asc_hi(bcberr >> 16); | |
1298 | ptr = pack_hex_byte(ptr, hx); | |
1299 | hx = hex_asc_lo(bcberr >> 16); | |
1300 | ptr = pack_hex_byte(ptr, hx); | |
1301 | hx = hex_asc_hi(bcberr >> 8); | |
1302 | ptr = pack_hex_byte(ptr, hx); | |
1303 | hx = hex_asc_lo(bcberr >> 8); | |
1304 | ptr = pack_hex_byte(ptr, hx); | |
1305 | hx = hex_asc_hi(bcberr); | |
1306 | ptr = pack_hex_byte(ptr, hx); | |
1307 | hx = hex_asc_lo(bcberr); | |
1308 | ptr = pack_hex_byte(ptr, hx); | |
b920de1b DH |
1309 | |
1310 | ptr = mem2hex(crlf, ptr, sizeof(crlf) - 1, 0); | |
1311 | *ptr = 0; | |
1312 | putpacket(output_buffer); /* send it off... */ | |
1313 | } | |
1314 | ||
1315 | /* | |
1316 | * tell the debugger that an exception has occurred | |
1317 | */ | |
1318 | ptr = output_buffer; | |
1319 | ||
1320 | /* | |
1321 | * Send trap type (converted to signal) | |
1322 | */ | |
1323 | *ptr++ = 'T'; | |
26824972 | 1324 | ptr = pack_hex_byte(ptr, sigval); |
b920de1b DH |
1325 | |
1326 | /* | |
1327 | * Send Error PC | |
1328 | */ | |
26824972 | 1329 | ptr = pack_hex_byte(ptr, GDB_REGID_PC); |
b920de1b DH |
1330 | *ptr++ = ':'; |
1331 | ptr = mem2hex(®s->pc, ptr, 4, 0); | |
1332 | *ptr++ = ';'; | |
1333 | ||
1334 | /* | |
1335 | * Send frame pointer | |
1336 | */ | |
26824972 | 1337 | ptr = pack_hex_byte(ptr, GDB_REGID_FP); |
b920de1b DH |
1338 | *ptr++ = ':'; |
1339 | ptr = mem2hex(®s->a3, ptr, 4, 0); | |
1340 | *ptr++ = ';'; | |
1341 | ||
1342 | /* | |
1343 | * Send stack pointer | |
1344 | */ | |
1345 | ssp = (unsigned long) (regs + 1); | |
26824972 | 1346 | ptr = pack_hex_byte(ptr, GDB_REGID_SP); |
b920de1b DH |
1347 | *ptr++ = ':'; |
1348 | ptr = mem2hex(&ssp, ptr, 4, 0); | |
1349 | *ptr++ = ';'; | |
1350 | ||
1351 | *ptr++ = 0; | |
1352 | putpacket(output_buffer); /* send it off... */ | |
1353 | ||
1354 | packet_waiting: | |
1355 | /* | |
1356 | * Wait for input from remote GDB | |
1357 | */ | |
1358 | while (1) { | |
1359 | output_buffer[0] = 0; | |
1360 | getpacket(input_buffer); | |
1361 | ||
1362 | switch (input_buffer[0]) { | |
1363 | /* request repeat of last signal number */ | |
1364 | case '?': | |
1365 | output_buffer[0] = 'S'; | |
26824972 HH |
1366 | output_buffer[1] = hex_asc_hi(sigval); |
1367 | output_buffer[2] = hex_asc_lo(sigval); | |
b920de1b DH |
1368 | output_buffer[3] = 0; |
1369 | break; | |
1370 | ||
1371 | case 'd': | |
1372 | /* toggle debug flag */ | |
1373 | break; | |
1374 | ||
1375 | /* | |
1376 | * Return the value of the CPU registers | |
1377 | */ | |
1378 | case 'g': | |
1379 | zero = 0; | |
1380 | ssp = (u32) (regs + 1); | |
1381 | ptr = output_buffer; | |
1382 | ptr = mem2hex(®s->d0, ptr, 4, 0); | |
1383 | ptr = mem2hex(®s->d1, ptr, 4, 0); | |
1384 | ptr = mem2hex(®s->d2, ptr, 4, 0); | |
1385 | ptr = mem2hex(®s->d3, ptr, 4, 0); | |
1386 | ptr = mem2hex(®s->a0, ptr, 4, 0); | |
1387 | ptr = mem2hex(®s->a1, ptr, 4, 0); | |
1388 | ptr = mem2hex(®s->a2, ptr, 4, 0); | |
1389 | ptr = mem2hex(®s->a3, ptr, 4, 0); | |
1390 | ||
1391 | ptr = mem2hex(&ssp, ptr, 4, 0); /* 8 */ | |
1392 | ptr = mem2hex(®s->pc, ptr, 4, 0); | |
1393 | ptr = mem2hex(®s->mdr, ptr, 4, 0); | |
1394 | ptr = mem2hex(®s->epsw, ptr, 4, 0); | |
1395 | ptr = mem2hex(®s->lir, ptr, 4, 0); | |
1396 | ptr = mem2hex(®s->lar, ptr, 4, 0); | |
1397 | ptr = mem2hex(®s->mdrq, ptr, 4, 0); | |
1398 | ||
1399 | ptr = mem2hex(®s->e0, ptr, 4, 0); /* 15 */ | |
1400 | ptr = mem2hex(®s->e1, ptr, 4, 0); | |
1401 | ptr = mem2hex(®s->e2, ptr, 4, 0); | |
1402 | ptr = mem2hex(®s->e3, ptr, 4, 0); | |
1403 | ptr = mem2hex(®s->e4, ptr, 4, 0); | |
1404 | ptr = mem2hex(®s->e5, ptr, 4, 0); | |
1405 | ptr = mem2hex(®s->e6, ptr, 4, 0); | |
1406 | ptr = mem2hex(®s->e7, ptr, 4, 0); | |
1407 | ||
1408 | ptr = mem2hex(&ssp, ptr, 4, 0); | |
1409 | ptr = mem2hex(®s, ptr, 4, 0); | |
1410 | ptr = mem2hex(®s->sp, ptr, 4, 0); | |
1411 | ptr = mem2hex(®s->mcrh, ptr, 4, 0); /* 26 */ | |
1412 | ptr = mem2hex(®s->mcrl, ptr, 4, 0); | |
1413 | ptr = mem2hex(®s->mcvf, ptr, 4, 0); | |
1414 | ||
1415 | ptr = mem2hex(&gdbstub_fpcr, ptr, 4, 0); /* 29 - FPCR */ | |
1416 | ptr = mem2hex(&zero, ptr, 4, 0); | |
1417 | ptr = mem2hex(&zero, ptr, 4, 0); | |
1418 | for (loop = 0; loop < 32; loop++) | |
1419 | ptr = mem2hex(&gdbstub_fpufs_array[loop], | |
1420 | ptr, 4, 0); /* 32 - FS0-31 */ | |
1421 | ||
1422 | break; | |
1423 | ||
1424 | /* | |
1425 | * set the value of the CPU registers - return OK | |
1426 | */ | |
1427 | case 'G': | |
1428 | { | |
1429 | const char *ptr; | |
1430 | ||
1431 | ptr = &input_buffer[1]; | |
1432 | ptr = hex2mem(ptr, ®s->d0, 4, 0); | |
1433 | ptr = hex2mem(ptr, ®s->d1, 4, 0); | |
1434 | ptr = hex2mem(ptr, ®s->d2, 4, 0); | |
1435 | ptr = hex2mem(ptr, ®s->d3, 4, 0); | |
1436 | ptr = hex2mem(ptr, ®s->a0, 4, 0); | |
1437 | ptr = hex2mem(ptr, ®s->a1, 4, 0); | |
1438 | ptr = hex2mem(ptr, ®s->a2, 4, 0); | |
1439 | ptr = hex2mem(ptr, ®s->a3, 4, 0); | |
1440 | ||
1441 | ptr = hex2mem(ptr, &ssp, 4, 0); /* 8 */ | |
1442 | ptr = hex2mem(ptr, ®s->pc, 4, 0); | |
1443 | ptr = hex2mem(ptr, ®s->mdr, 4, 0); | |
1444 | ptr = hex2mem(ptr, ®s->epsw, 4, 0); | |
1445 | ptr = hex2mem(ptr, ®s->lir, 4, 0); | |
1446 | ptr = hex2mem(ptr, ®s->lar, 4, 0); | |
1447 | ptr = hex2mem(ptr, ®s->mdrq, 4, 0); | |
1448 | ||
1449 | ptr = hex2mem(ptr, ®s->e0, 4, 0); /* 15 */ | |
1450 | ptr = hex2mem(ptr, ®s->e1, 4, 0); | |
1451 | ptr = hex2mem(ptr, ®s->e2, 4, 0); | |
1452 | ptr = hex2mem(ptr, ®s->e3, 4, 0); | |
1453 | ptr = hex2mem(ptr, ®s->e4, 4, 0); | |
1454 | ptr = hex2mem(ptr, ®s->e5, 4, 0); | |
1455 | ptr = hex2mem(ptr, ®s->e6, 4, 0); | |
1456 | ptr = hex2mem(ptr, ®s->e7, 4, 0); | |
1457 | ||
1458 | ptr = hex2mem(ptr, &ssp, 4, 0); | |
1459 | ptr = hex2mem(ptr, &zero, 4, 0); | |
1460 | ptr = hex2mem(ptr, ®s->sp, 4, 0); | |
1461 | ptr = hex2mem(ptr, ®s->mcrh, 4, 0); /* 26 */ | |
1462 | ptr = hex2mem(ptr, ®s->mcrl, 4, 0); | |
1463 | ptr = hex2mem(ptr, ®s->mcvf, 4, 0); | |
1464 | ||
1465 | ptr = hex2mem(ptr, &zero, 4, 0); /* 29 - FPCR */ | |
1466 | ptr = hex2mem(ptr, &zero, 4, 0); | |
1467 | ptr = hex2mem(ptr, &zero, 4, 0); | |
1468 | for (loop = 0; loop < 32; loop++) /* 32 - FS0-31 */ | |
1469 | ptr = hex2mem(ptr, &zero, 4, 0); | |
1470 | ||
1471 | #if 0 | |
1472 | /* | |
1473 | * See if the stack pointer has moved. If so, then copy | |
1474 | * the saved locals and ins to the new location. | |
1475 | */ | |
1476 | unsigned long *newsp = (unsigned long *) registers[SP]; | |
1477 | if (sp != newsp) | |
1478 | sp = memcpy(newsp, sp, 16 * 4); | |
1479 | #endif | |
1480 | ||
1481 | gdbstub_strcpy(output_buffer, "OK"); | |
1482 | } | |
1483 | break; | |
1484 | ||
1485 | /* | |
1486 | * mAA..AA,LLLL Read LLLL bytes at address AA..AA | |
1487 | */ | |
1488 | case 'm': | |
1489 | ptr = &input_buffer[1]; | |
1490 | ||
1491 | if (hexToInt(&ptr, &addr) && | |
1492 | *ptr++ == ',' && | |
1493 | hexToInt(&ptr, &length) | |
1494 | ) { | |
1495 | if (mem2hex((char *) addr, output_buffer, | |
1496 | length, 1)) | |
1497 | break; | |
1498 | gdbstub_strcpy(output_buffer, "E03"); | |
1499 | } else { | |
1500 | gdbstub_strcpy(output_buffer, "E01"); | |
1501 | } | |
1502 | break; | |
1503 | ||
1504 | /* | |
1505 | * MAA..AA,LLLL: Write LLLL bytes at address AA.AA | |
1506 | * return OK | |
1507 | */ | |
1508 | case 'M': | |
1509 | ptr = &input_buffer[1]; | |
1510 | ||
1511 | if (hexToInt(&ptr, &addr) && | |
1512 | *ptr++ == ',' && | |
1513 | hexToInt(&ptr, &length) && | |
1514 | *ptr++ == ':' | |
1515 | ) { | |
1516 | if (hex2mem(ptr, (char *) addr, length, 1)) | |
1517 | gdbstub_strcpy(output_buffer, "OK"); | |
1518 | else | |
1519 | gdbstub_strcpy(output_buffer, "E03"); | |
1520 | ||
1521 | gdbstub_flush_caches = 1; | |
1522 | } else { | |
1523 | gdbstub_strcpy(output_buffer, "E02"); | |
1524 | } | |
1525 | break; | |
1526 | ||
1527 | /* | |
1528 | * cAA..AA Continue at address AA..AA(optional) | |
1529 | */ | |
1530 | case 'c': | |
1531 | /* try to read optional parameter, pc unchanged if no | |
1532 | * parm */ | |
1533 | ||
1534 | ptr = &input_buffer[1]; | |
1535 | if (hexToInt(&ptr, &addr)) | |
1536 | regs->pc = addr; | |
1537 | goto done; | |
1538 | ||
1539 | /* | |
1540 | * kill the program | |
1541 | */ | |
1542 | case 'k' : | |
1543 | goto done; /* just continue */ | |
1544 | ||
1545 | /* | |
1546 | * Reset the whole machine (FIXME: system dependent) | |
1547 | */ | |
1548 | case 'r': | |
1549 | break; | |
1550 | ||
1551 | /* | |
1552 | * Step to next instruction | |
1553 | */ | |
1554 | case 's': | |
1555 | /* | |
1556 | * using the T flag doesn't seem to perform single | |
1557 | * stepping (it seems to wind up being caught by the | |
1558 | * JTAG unit), so we have to use breakpoints and | |
1559 | * continue instead. | |
1560 | */ | |
1561 | if (gdbstub_single_step(regs) < 0) | |
1562 | /* ignore any fault error for now */ | |
1563 | gdbstub_printk("unable to set single-step" | |
1564 | " bp\n"); | |
1565 | goto done; | |
1566 | ||
1567 | /* | |
1568 | * Set baud rate (bBB) | |
1569 | */ | |
1570 | case 'b': | |
1571 | do { | |
1572 | int baudrate; | |
1573 | ||
1574 | ptr = &input_buffer[1]; | |
1575 | if (!hexToInt(&ptr, &baudrate)) { | |
1576 | gdbstub_strcpy(output_buffer, "B01"); | |
1577 | break; | |
1578 | } | |
1579 | ||
1580 | if (baudrate) { | |
1581 | /* ACK before changing speed */ | |
1582 | putpacket("OK"); | |
1583 | gdbstub_io_set_baud(baudrate); | |
1584 | } | |
1585 | } while (0); | |
1586 | break; | |
1587 | ||
1588 | /* | |
1589 | * Set breakpoint | |
1590 | */ | |
1591 | case 'Z': | |
1592 | ptr = &input_buffer[1]; | |
1593 | ||
1594 | if (!hexToInt(&ptr, &loop) || *ptr++ != ',' || | |
1595 | !hexToInt(&ptr, &addr) || *ptr++ != ',' || | |
1596 | !hexToInt(&ptr, &length) | |
1597 | ) { | |
1598 | gdbstub_strcpy(output_buffer, "E01"); | |
1599 | break; | |
1600 | } | |
1601 | ||
1602 | /* only support software breakpoints */ | |
1603 | gdbstub_strcpy(output_buffer, "E03"); | |
1604 | if (loop != 0 || | |
1605 | length < 1 || | |
1606 | length > 7 || | |
1607 | (unsigned long) addr < 4096) | |
1608 | break; | |
1609 | ||
1610 | if (gdbstub_set_breakpoint((u8 *) addr, length) < 0) | |
1611 | break; | |
1612 | ||
1613 | gdbstub_strcpy(output_buffer, "OK"); | |
1614 | break; | |
1615 | ||
1616 | /* | |
1617 | * Clear breakpoint | |
1618 | */ | |
1619 | case 'z': | |
1620 | ptr = &input_buffer[1]; | |
1621 | ||
1622 | if (!hexToInt(&ptr, &loop) || *ptr++ != ',' || | |
1623 | !hexToInt(&ptr, &addr) || *ptr++ != ',' || | |
1624 | !hexToInt(&ptr, &length) | |
1625 | ) { | |
1626 | gdbstub_strcpy(output_buffer, "E01"); | |
1627 | break; | |
1628 | } | |
1629 | ||
1630 | /* only support software breakpoints */ | |
1631 | gdbstub_strcpy(output_buffer, "E03"); | |
1632 | if (loop != 0 || | |
1633 | length < 1 || | |
1634 | length > 7 || | |
1635 | (unsigned long) addr < 4096) | |
1636 | break; | |
1637 | ||
1638 | if (gdbstub_clear_breakpoint((u8 *) addr, length) < 0) | |
1639 | break; | |
1640 | ||
1641 | gdbstub_strcpy(output_buffer, "OK"); | |
1642 | break; | |
1643 | ||
1644 | default: | |
1645 | gdbstub_proto("### GDB Unsupported Cmd '%s'\n", | |
1646 | input_buffer); | |
1647 | break; | |
1648 | } | |
1649 | ||
1650 | /* reply to the request */ | |
1651 | putpacket(output_buffer); | |
1652 | } | |
1653 | ||
1654 | done: | |
1655 | /* | |
1656 | * Need to flush the instruction cache here, as we may | |
1657 | * have deposited a breakpoint, and the icache probably | |
1658 | * has no way of knowing that a data ref to some location | |
1659 | * may have changed something that is in the instruction | |
1660 | * cache. | |
1661 | * NB: We flush both caches, just to be sure... | |
1662 | */ | |
1663 | if (gdbstub_flush_caches) | |
1664 | gdbstub_purge_cache(); | |
1665 | ||
1666 | gdbstub_load_fpu(); | |
1667 | mn10300_set_gdbleds(0); | |
1668 | if (excep == EXCEP_NMI) | |
1669 | NMICR = NMICR_NMIF; | |
1670 | ||
1671 | touch_softlockup_watchdog(); | |
1672 | ||
1673 | local_irq_restore(epsw); | |
1674 | return 1; | |
1675 | } | |
1676 | ||
1677 | /* | |
1678 | * handle event interception | |
1679 | */ | |
1680 | asmlinkage int gdbstub_intercept(struct pt_regs *regs, | |
1681 | enum exception_code excep) | |
1682 | { | |
1683 | static u8 notfirst = 1; | |
1684 | int ret; | |
1685 | ||
1686 | if (gdbstub_busy) | |
1687 | gdbstub_printk("--> gdbstub reentered itself\n"); | |
1688 | gdbstub_busy = 1; | |
1689 | ||
1690 | if (notfirst) { | |
1691 | unsigned long mdr; | |
1692 | asm("mov mdr,%0" : "=d"(mdr)); | |
1693 | ||
1694 | gdbstub_entry( | |
1695 | "--> gdbstub_intercept(%p,%04x) [MDR=%lx PC=%lx]\n", | |
1696 | regs, excep, mdr, regs->pc); | |
1697 | ||
1698 | gdbstub_entry( | |
1699 | "PC: %08lx EPSW: %08lx SSP: %08lx mode: %s\n", | |
1700 | regs->pc, regs->epsw, (unsigned long) &ret, | |
1701 | user_mode(regs) ? "User" : "Super"); | |
1702 | gdbstub_entry( | |
1703 | "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n", | |
1704 | regs->d0, regs->d1, regs->d2, regs->d3); | |
1705 | gdbstub_entry( | |
1706 | "a0: %08lx a1: %08lx a2: %08lx a3: %08lx\n", | |
1707 | regs->a0, regs->a1, regs->a2, regs->a3); | |
1708 | gdbstub_entry( | |
1709 | "e0: %08lx e1: %08lx e2: %08lx e3: %08lx\n", | |
1710 | regs->e0, regs->e1, regs->e2, regs->e3); | |
1711 | gdbstub_entry( | |
1712 | "e4: %08lx e5: %08lx e6: %08lx e7: %08lx\n", | |
1713 | regs->e4, regs->e5, regs->e6, regs->e7); | |
1714 | gdbstub_entry( | |
1715 | "lar: %08lx lir: %08lx mdr: %08lx usp: %08lx\n", | |
1716 | regs->lar, regs->lir, regs->mdr, regs->sp); | |
1717 | gdbstub_entry( | |
1718 | "cvf: %08lx crl: %08lx crh: %08lx drq: %08lx\n", | |
1719 | regs->mcvf, regs->mcrl, regs->mcrh, regs->mdrq); | |
1720 | gdbstub_entry( | |
1721 | "threadinfo=%p task=%p)\n", | |
1722 | current_thread_info(), current); | |
1723 | } else { | |
1724 | notfirst = 1; | |
1725 | } | |
1726 | ||
1727 | ret = gdbstub(regs, excep); | |
1728 | ||
1729 | gdbstub_entry("<-- gdbstub_intercept()\n"); | |
1730 | gdbstub_busy = 0; | |
1731 | return ret; | |
1732 | } | |
1733 | ||
1734 | /* | |
1735 | * handle the GDB stub itself causing an exception | |
1736 | */ | |
1737 | asmlinkage void gdbstub_exception(struct pt_regs *regs, | |
1738 | enum exception_code excep) | |
1739 | { | |
1740 | unsigned long mdr; | |
1741 | ||
1742 | asm("mov mdr,%0" : "=d"(mdr)); | |
1743 | gdbstub_entry("--> gdbstub exception({%p},%04x) [MDR=%lx]\n", | |
1744 | regs, excep, mdr); | |
1745 | ||
1746 | while ((unsigned long) regs == 0xffffffff) {} | |
1747 | ||
1748 | /* handle guarded memory accesses where we know it might fault */ | |
1749 | if (regs->pc == (unsigned) gdbstub_read_byte_guard) { | |
1750 | regs->pc = (unsigned) gdbstub_read_byte_cont; | |
1751 | goto fault; | |
1752 | } | |
1753 | ||
1754 | if (regs->pc == (unsigned) gdbstub_read_word_guard) { | |
1755 | regs->pc = (unsigned) gdbstub_read_word_cont; | |
1756 | goto fault; | |
1757 | } | |
1758 | ||
1759 | if (regs->pc == (unsigned) gdbstub_read_dword_guard) { | |
1760 | regs->pc = (unsigned) gdbstub_read_dword_cont; | |
1761 | goto fault; | |
1762 | } | |
1763 | ||
1764 | if (regs->pc == (unsigned) gdbstub_write_byte_guard) { | |
1765 | regs->pc = (unsigned) gdbstub_write_byte_cont; | |
1766 | goto fault; | |
1767 | } | |
1768 | ||
1769 | if (regs->pc == (unsigned) gdbstub_write_word_guard) { | |
1770 | regs->pc = (unsigned) gdbstub_write_word_cont; | |
1771 | goto fault; | |
1772 | } | |
1773 | ||
1774 | if (regs->pc == (unsigned) gdbstub_write_dword_guard) { | |
1775 | regs->pc = (unsigned) gdbstub_write_dword_cont; | |
1776 | goto fault; | |
1777 | } | |
1778 | ||
1779 | gdbstub_printk("\n### GDB stub caused an exception ###\n"); | |
1780 | ||
1781 | /* something went horribly wrong */ | |
1782 | console_verbose(); | |
1783 | show_registers(regs); | |
1784 | ||
1785 | panic("GDB Stub caused an unexpected exception - can't continue\n"); | |
1786 | ||
1787 | /* we caught an attempt by the stub to access silly memory */ | |
1788 | fault: | |
1789 | gdbstub_entry("<-- gdbstub exception() = EFAULT\n"); | |
1790 | regs->d0 = -EFAULT; | |
1791 | return; | |
1792 | } | |
1793 | ||
1794 | /* | |
1795 | * send an exit message to GDB | |
1796 | */ | |
1797 | void gdbstub_exit(int status) | |
1798 | { | |
1799 | unsigned char checksum; | |
1800 | unsigned char ch; | |
1801 | int count; | |
1802 | ||
1803 | gdbstub_busy = 1; | |
1804 | output_buffer[0] = 'W'; | |
26824972 HH |
1805 | output_buffer[1] = hex_asc_hi(status); |
1806 | output_buffer[2] = hex_asc_lo(status); | |
b920de1b DH |
1807 | output_buffer[3] = 0; |
1808 | ||
1809 | gdbstub_io_tx_char('$'); | |
1810 | checksum = 0; | |
1811 | count = 0; | |
1812 | ||
1813 | while ((ch = output_buffer[count]) != 0) { | |
1814 | gdbstub_io_tx_char(ch); | |
1815 | checksum += ch; | |
1816 | count += 1; | |
1817 | } | |
1818 | ||
1819 | gdbstub_io_tx_char('#'); | |
26824972 HH |
1820 | gdbstub_io_tx_char(hex_asc_hi(checksum)); |
1821 | gdbstub_io_tx_char(hex_asc_lo(checksum)); | |
b920de1b DH |
1822 | |
1823 | /* make sure the output is flushed, or else RedBoot might clobber it */ | |
1824 | gdbstub_io_tx_flush(); | |
1825 | ||
1826 | gdbstub_busy = 0; | |
1827 | } | |
1828 | ||
1829 | /* | |
1830 | * initialise the GDB stub | |
1831 | */ | |
1832 | asmlinkage void __init gdbstub_init(void) | |
1833 | { | |
1834 | #ifdef CONFIG_GDBSTUB_IMMEDIATE | |
1835 | unsigned char ch; | |
1836 | int ret; | |
1837 | #endif | |
1838 | ||
1839 | gdbstub_busy = 1; | |
1840 | ||
1841 | printk(KERN_INFO "%s", gdbstub_banner); | |
1842 | ||
1843 | gdbstub_io_init(); | |
1844 | ||
1845 | gdbstub_entry("--> gdbstub_init\n"); | |
1846 | ||
1847 | /* try to talk to GDB (or anyone insane enough to want to type GDB | |
1848 | * protocol by hand) */ | |
1849 | gdbstub_io("### GDB Tx ACK\n"); | |
1850 | gdbstub_io_tx_char('+'); /* 'hello world' */ | |
1851 | ||
1852 | #ifdef CONFIG_GDBSTUB_IMMEDIATE | |
1853 | gdbstub_printk("GDB Stub waiting for packet\n"); | |
1854 | ||
1855 | /* in case GDB is started before us, ACK any packets that are already | |
1856 | * sitting there (presumably "$?#xx") | |
1857 | */ | |
1858 | do { gdbstub_io_rx_char(&ch, 0); } while (ch != '$'); | |
1859 | do { gdbstub_io_rx_char(&ch, 0); } while (ch != '#'); | |
1860 | /* eat first csum byte */ | |
1861 | do { ret = gdbstub_io_rx_char(&ch, 0); } while (ret != 0); | |
1862 | /* eat second csum byte */ | |
1863 | do { ret = gdbstub_io_rx_char(&ch, 0); } while (ret != 0); | |
1864 | ||
1865 | gdbstub_io("### GDB Tx NAK\n"); | |
1866 | gdbstub_io_tx_char('-'); /* NAK it */ | |
1867 | ||
1868 | #else | |
1869 | printk("GDB Stub ready\n"); | |
1870 | #endif | |
1871 | ||
1872 | gdbstub_busy = 0; | |
1873 | gdbstub_entry("<-- gdbstub_init\n"); | |
1874 | } | |
1875 | ||
1876 | /* | |
1877 | * register the console at a more appropriate time | |
1878 | */ | |
1879 | #ifdef CONFIG_GDBSTUB_CONSOLE | |
1880 | static int __init gdbstub_postinit(void) | |
1881 | { | |
1882 | printk(KERN_NOTICE "registering console\n"); | |
1883 | register_console(&gdbstub_console); | |
1884 | return 0; | |
1885 | } | |
1886 | ||
1887 | __initcall(gdbstub_postinit); | |
1888 | #endif | |
1889 | ||
1890 | /* | |
1891 | * handle character reception on GDB serial port | |
1892 | * - jump into the GDB stub if BREAK is detected on the serial line | |
1893 | */ | |
1894 | asmlinkage void gdbstub_rx_irq(struct pt_regs *regs, enum exception_code excep) | |
1895 | { | |
1896 | char ch; | |
1897 | int ret; | |
1898 | ||
1899 | gdbstub_entry("--> gdbstub_rx_irq\n"); | |
1900 | ||
1901 | do { | |
1902 | ret = gdbstub_io_rx_char(&ch, 1); | |
1903 | if (ret != -EIO && ret != -EAGAIN) { | |
1904 | if (ret != -EINTR) | |
1905 | gdbstub_rx_unget = ch; | |
1906 | gdbstub(regs, excep); | |
1907 | } | |
1908 | } while (ret != -EAGAIN); | |
1909 | ||
1910 | gdbstub_entry("<-- gdbstub_rx_irq\n"); | |
1911 | } |