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1da177e4 LT |
1 | /* gdb-stub.c: FRV GDB stub |
2 | * | |
3 | * Copyright (C) 2003,4 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * - Derived from Linux/MIPS version, Copyright (C) 1995 Andreas Busse | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
13 | /* | |
14 | * To enable debugger support, two things need to happen. One, a | |
15 | * call to set_debug_traps() is necessary in order to allow any breakpoints | |
16 | * or error conditions to be properly intercepted and reported to gdb. | |
17 | * Two, a breakpoint needs to be generated to begin communication. This | |
18 | * is most easily accomplished by a call to breakpoint(). Breakpoint() | |
19 | * simulates a breakpoint by executing a BREAK instruction. | |
20 | * | |
21 | * | |
22 | * The following gdb commands are supported: | |
23 | * | |
24 | * command function Return value | |
25 | * | |
26 | * g return the value of the CPU registers hex data or ENN | |
27 | * G set the value of the CPU registers OK or ENN | |
28 | * | |
29 | * mAA..AA,LLLL Read LLLL bytes at address AA..AA hex data or ENN | |
30 | * MAA..AA,LLLL: Write LLLL bytes at address AA.AA OK or ENN | |
31 | * | |
32 | * c Resume at current address SNN ( signal NN) | |
33 | * cAA..AA Continue at address AA..AA SNN | |
34 | * | |
35 | * s Step one instruction SNN | |
36 | * sAA..AA Step one instruction from AA..AA SNN | |
37 | * | |
38 | * k kill | |
39 | * | |
40 | * ? What was the last sigval ? SNN (signal NN) | |
41 | * | |
42 | * bBB..BB Set baud rate to BB..BB OK or BNN, then sets | |
43 | * baud rate | |
44 | * | |
45 | * All commands and responses are sent with a packet which includes a | |
46 | * checksum. A packet consists of | |
47 | * | |
48 | * $<packet info>#<checksum>. | |
49 | * | |
50 | * where | |
51 | * <packet info> :: <characters representing the command or response> | |
52 | * <checksum> :: < two hex digits computed as modulo 256 sum of <packetinfo>> | |
53 | * | |
54 | * When a packet is received, it is first acknowledged with either '+' or '-'. | |
55 | * '+' indicates a successful transfer. '-' indicates a failed transfer. | |
56 | * | |
57 | * Example: | |
58 | * | |
59 | * Host: Reply: | |
60 | * $m0,10#2a +$00010203040506070809101112131415#42 | |
61 | * | |
62 | * | |
63 | * ============== | |
64 | * MORE EXAMPLES: | |
65 | * ============== | |
66 | * | |
67 | * For reference -- the following are the steps that one | |
68 | * company took (RidgeRun Inc) to get remote gdb debugging | |
69 | * going. In this scenario the host machine was a PC and the | |
70 | * target platform was a Galileo EVB64120A MIPS evaluation | |
71 | * board. | |
72 | * | |
73 | * Step 1: | |
74 | * First download gdb-5.0.tar.gz from the internet. | |
75 | * and then build/install the package. | |
76 | * | |
77 | * Example: | |
78 | * $ tar zxf gdb-5.0.tar.gz | |
79 | * $ cd gdb-5.0 | |
80 | * $ ./configure --target=frv-elf-gdb | |
81 | * $ make | |
82 | * $ frv-elf-gdb | |
83 | * | |
84 | * Step 2: | |
85 | * Configure linux for remote debugging and build it. | |
86 | * | |
87 | * Example: | |
88 | * $ cd ~/linux | |
89 | * $ make menuconfig <go to "Kernel Hacking" and turn on remote debugging> | |
90 | * $ make dep; make vmlinux | |
91 | * | |
92 | * Step 3: | |
93 | * Download the kernel to the remote target and start | |
94 | * the kernel running. It will promptly halt and wait | |
95 | * for the host gdb session to connect. It does this | |
96 | * since the "Kernel Hacking" option has defined | |
97 | * CONFIG_REMOTE_DEBUG which in turn enables your calls | |
98 | * to: | |
99 | * set_debug_traps(); | |
100 | * breakpoint(); | |
101 | * | |
102 | * Step 4: | |
103 | * Start the gdb session on the host. | |
104 | * | |
105 | * Example: | |
106 | * $ frv-elf-gdb vmlinux | |
107 | * (gdb) set remotebaud 115200 | |
108 | * (gdb) target remote /dev/ttyS1 | |
109 | * ...at this point you are connected to | |
110 | * the remote target and can use gdb | |
111 | * in the normal fasion. Setting | |
112 | * breakpoints, single stepping, | |
113 | * printing variables, etc. | |
114 | * | |
115 | */ | |
116 | ||
117 | #include <linux/string.h> | |
118 | #include <linux/kernel.h> | |
119 | #include <linux/signal.h> | |
120 | #include <linux/sched.h> | |
121 | #include <linux/mm.h> | |
122 | #include <linux/console.h> | |
123 | #include <linux/init.h> | |
124 | #include <linux/slab.h> | |
125 | #include <linux/nmi.h> | |
126 | ||
84e8cd6d | 127 | #include <asm/asm-offsets.h> |
1da177e4 LT |
128 | #include <asm/pgtable.h> |
129 | #include <asm/system.h> | |
130 | #include <asm/gdb-stub.h> | |
131 | ||
132 | #define LEDS(x) do { /* *(u32*)0xe1200004 = ~(x); mb(); */ } while(0) | |
133 | ||
134 | #undef GDBSTUB_DEBUG_PROTOCOL | |
135 | ||
136 | extern void debug_to_serial(const char *p, int n); | |
137 | extern void gdbstub_console_write(struct console *co, const char *p, unsigned n); | |
138 | ||
139 | extern volatile uint32_t __break_error_detect[3]; /* ESFR1, ESR15, EAR15 */ | |
1da177e4 LT |
140 | |
141 | struct __debug_amr { | |
142 | unsigned long L, P; | |
143 | } __attribute__((aligned(8))); | |
144 | ||
145 | struct __debug_mmu { | |
146 | struct { | |
147 | unsigned long hsr0, pcsr, esr0, ear0, epcr0; | |
148 | #ifdef CONFIG_MMU | |
149 | unsigned long tplr, tppr, tpxr, cxnr; | |
150 | #endif | |
151 | } regs; | |
152 | ||
153 | struct __debug_amr iamr[16]; | |
154 | struct __debug_amr damr[16]; | |
155 | ||
156 | #ifdef CONFIG_MMU | |
157 | struct __debug_amr tlb[64*2]; | |
158 | #endif | |
159 | }; | |
160 | ||
161 | static struct __debug_mmu __debug_mmu; | |
162 | ||
163 | /* | |
164 | * BUFMAX defines the maximum number of characters in inbound/outbound buffers | |
165 | * at least NUMREGBYTES*2 are needed for register packets | |
166 | */ | |
167 | #define BUFMAX 2048 | |
168 | ||
169 | #define BREAK_INSN 0x801000c0 /* use "break" as bkpt */ | |
170 | ||
171 | static const char gdbstub_banner[] = "Linux/FR-V GDB Stub (c) RedHat 2003\n"; | |
172 | ||
173 | volatile u8 gdbstub_rx_buffer[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE))); | |
174 | volatile u32 gdbstub_rx_inp = 0; | |
175 | volatile u32 gdbstub_rx_outp = 0; | |
176 | volatile u8 gdbstub_rx_overflow = 0; | |
177 | u8 gdbstub_rx_unget = 0; | |
178 | ||
179 | /* set with GDB whilst running to permit step through exceptions */ | |
180 | extern volatile u32 __attribute__((section(".bss"))) gdbstub_trace_through_exceptions; | |
181 | ||
182 | static char input_buffer[BUFMAX]; | |
183 | static char output_buffer[BUFMAX]; | |
184 | ||
185 | static const char hexchars[] = "0123456789abcdef"; | |
186 | ||
187 | static const char *regnames[] = { | |
188 | "PSR ", "ISR ", "CCR ", "CCCR", | |
189 | "LR ", "LCR ", "PC ", "_stt", | |
190 | "sys ", "GR8*", "GNE0", "GNE1", | |
191 | "IACH", "IACL", | |
192 | "TBR ", "SP ", "FP ", "GR3 ", | |
193 | "GR4 ", "GR5 ", "GR6 ", "GR7 ", | |
194 | "GR8 ", "GR9 ", "GR10", "GR11", | |
195 | "GR12", "GR13", "GR14", "GR15", | |
196 | "GR16", "GR17", "GR18", "GR19", | |
197 | "GR20", "GR21", "GR22", "GR23", | |
198 | "GR24", "GR25", "GR26", "GR27", | |
199 | "EFRM", "CURR", "GR30", "BFRM" | |
200 | }; | |
201 | ||
202 | struct gdbstub_bkpt { | |
203 | unsigned long addr; /* address of breakpoint */ | |
204 | unsigned len; /* size of breakpoint */ | |
205 | uint32_t originsns[7]; /* original instructions */ | |
206 | }; | |
207 | ||
208 | static struct gdbstub_bkpt gdbstub_bkpts[256]; | |
209 | ||
210 | /* | |
211 | * local prototypes | |
212 | */ | |
213 | ||
214 | static void gdbstub_recv_packet(char *buffer); | |
215 | static int gdbstub_send_packet(char *buffer); | |
216 | static int gdbstub_compute_signal(unsigned long tbr); | |
217 | static int hex(unsigned char ch); | |
218 | static int hexToInt(char **ptr, unsigned long *intValue); | |
219 | static unsigned char *mem2hex(const void *mem, char *buf, int count, int may_fault); | |
220 | static char *hex2mem(const char *buf, void *_mem, int count); | |
221 | ||
222 | /* | |
223 | * Convert ch from a hex digit to an int | |
224 | */ | |
225 | static int hex(unsigned char ch) | |
226 | { | |
227 | if (ch >= 'a' && ch <= 'f') | |
228 | return ch-'a'+10; | |
229 | if (ch >= '0' && ch <= '9') | |
230 | return ch-'0'; | |
231 | if (ch >= 'A' && ch <= 'F') | |
232 | return ch-'A'+10; | |
233 | return -1; | |
234 | } | |
235 | ||
236 | void gdbstub_printk(const char *fmt, ...) | |
237 | { | |
238 | static char buf[1024]; | |
239 | va_list args; | |
240 | int len; | |
241 | ||
242 | /* Emit the output into the temporary buffer */ | |
243 | va_start(args, fmt); | |
244 | len = vsnprintf(buf, sizeof(buf), fmt, args); | |
245 | va_end(args); | |
246 | debug_to_serial(buf, len); | |
247 | } | |
248 | ||
249 | static inline char *gdbstub_strcpy(char *dst, const char *src) | |
250 | { | |
251 | int loop = 0; | |
252 | while ((dst[loop] = src[loop])) | |
253 | loop++; | |
254 | return dst; | |
255 | } | |
256 | ||
257 | static void gdbstub_purge_cache(void) | |
258 | { | |
259 | asm volatile(" dcef @(gr0,gr0),#1 \n" | |
260 | " icei @(gr0,gr0),#1 \n" | |
261 | " membar \n" | |
262 | " bar \n" | |
263 | ); | |
264 | } | |
265 | ||
266 | /*****************************************************************************/ | |
267 | /* | |
268 | * scan for the sequence $<data>#<checksum> | |
269 | */ | |
270 | static void gdbstub_recv_packet(char *buffer) | |
271 | { | |
272 | unsigned char checksum; | |
273 | unsigned char xmitcsum; | |
274 | unsigned char ch; | |
275 | int count, i, ret, error; | |
276 | ||
277 | for (;;) { | |
278 | /* wait around for the start character, ignore all other characters */ | |
279 | do { | |
280 | gdbstub_rx_char(&ch, 0); | |
281 | } while (ch != '$'); | |
282 | ||
283 | checksum = 0; | |
284 | xmitcsum = -1; | |
285 | count = 0; | |
286 | error = 0; | |
287 | ||
288 | /* now, read until a # or end of buffer is found */ | |
289 | while (count < BUFMAX) { | |
290 | ret = gdbstub_rx_char(&ch, 0); | |
291 | if (ret < 0) | |
292 | error = ret; | |
293 | ||
294 | if (ch == '#') | |
295 | break; | |
296 | checksum += ch; | |
297 | buffer[count] = ch; | |
298 | count++; | |
299 | } | |
300 | ||
301 | if (error == -EIO) { | |
302 | gdbstub_proto("### GDB Rx Error - Skipping packet ###\n"); | |
303 | gdbstub_proto("### GDB Tx NAK\n"); | |
304 | gdbstub_tx_char('-'); | |
305 | continue; | |
306 | } | |
307 | ||
308 | if (count >= BUFMAX || error) | |
309 | continue; | |
310 | ||
311 | buffer[count] = 0; | |
312 | ||
313 | /* read the checksum */ | |
314 | ret = gdbstub_rx_char(&ch, 0); | |
315 | if (ret < 0) | |
316 | error = ret; | |
317 | xmitcsum = hex(ch) << 4; | |
318 | ||
319 | ret = gdbstub_rx_char(&ch, 0); | |
320 | if (ret < 0) | |
321 | error = ret; | |
322 | xmitcsum |= hex(ch); | |
323 | ||
324 | if (error) { | |
325 | if (error == -EIO) | |
326 | gdbstub_proto("### GDB Rx Error - Skipping packet\n"); | |
327 | gdbstub_proto("### GDB Tx NAK\n"); | |
328 | gdbstub_tx_char('-'); | |
329 | continue; | |
330 | } | |
331 | ||
332 | /* check the checksum */ | |
333 | if (checksum != xmitcsum) { | |
334 | gdbstub_proto("### GDB Tx NAK\n"); | |
335 | gdbstub_tx_char('-'); /* failed checksum */ | |
336 | continue; | |
337 | } | |
338 | ||
339 | gdbstub_proto("### GDB Rx '$%s#%02x' ###\n", buffer, checksum); | |
340 | gdbstub_proto("### GDB Tx ACK\n"); | |
341 | gdbstub_tx_char('+'); /* successful transfer */ | |
342 | ||
343 | /* if a sequence char is present, reply the sequence ID */ | |
344 | if (buffer[2] == ':') { | |
345 | gdbstub_tx_char(buffer[0]); | |
346 | gdbstub_tx_char(buffer[1]); | |
347 | ||
348 | /* remove sequence chars from buffer */ | |
349 | count = 0; | |
350 | while (buffer[count]) count++; | |
351 | for (i=3; i <= count; i++) | |
352 | buffer[i - 3] = buffer[i]; | |
353 | } | |
354 | ||
355 | break; | |
356 | } | |
357 | } /* end gdbstub_recv_packet() */ | |
358 | ||
359 | /*****************************************************************************/ | |
360 | /* | |
361 | * send the packet in buffer. | |
362 | * - return 0 if successfully ACK'd | |
363 | * - return 1 if abandoned due to new incoming packet | |
364 | */ | |
365 | static int gdbstub_send_packet(char *buffer) | |
366 | { | |
367 | unsigned char checksum; | |
368 | int count; | |
369 | unsigned char ch; | |
370 | ||
371 | /* $<packet info>#<checksum> */ | |
372 | gdbstub_proto("### GDB Tx '%s' ###\n", buffer); | |
373 | ||
374 | do { | |
375 | gdbstub_tx_char('$'); | |
376 | checksum = 0; | |
377 | count = 0; | |
378 | ||
379 | while ((ch = buffer[count]) != 0) { | |
380 | gdbstub_tx_char(ch); | |
381 | checksum += ch; | |
382 | count += 1; | |
383 | } | |
384 | ||
385 | gdbstub_tx_char('#'); | |
386 | gdbstub_tx_char(hexchars[checksum >> 4]); | |
387 | gdbstub_tx_char(hexchars[checksum & 0xf]); | |
388 | ||
389 | } while (gdbstub_rx_char(&ch,0), | |
390 | #ifdef GDBSTUB_DEBUG_PROTOCOL | |
391 | ch=='-' && (gdbstub_proto("### GDB Rx NAK\n"),0), | |
392 | ch!='-' && ch!='+' && (gdbstub_proto("### GDB Rx ??? %02x\n",ch),0), | |
393 | #endif | |
394 | ch!='+' && ch!='$'); | |
395 | ||
396 | if (ch=='+') { | |
397 | gdbstub_proto("### GDB Rx ACK\n"); | |
398 | return 0; | |
399 | } | |
400 | ||
401 | gdbstub_proto("### GDB Tx Abandoned\n"); | |
402 | gdbstub_rx_unget = ch; | |
403 | return 1; | |
404 | } /* end gdbstub_send_packet() */ | |
405 | ||
406 | /* | |
407 | * While we find nice hex chars, build an int. | |
408 | * Return number of chars processed. | |
409 | */ | |
410 | static int hexToInt(char **ptr, unsigned long *_value) | |
411 | { | |
412 | int count = 0, ch; | |
413 | ||
414 | *_value = 0; | |
415 | while (**ptr) { | |
416 | ch = hex(**ptr); | |
417 | if (ch < 0) | |
418 | break; | |
419 | ||
420 | *_value = (*_value << 4) | ((uint8_t) ch & 0xf); | |
421 | count++; | |
422 | ||
423 | (*ptr)++; | |
424 | } | |
425 | ||
426 | return count; | |
427 | } | |
428 | ||
429 | /*****************************************************************************/ | |
430 | /* | |
431 | * probe an address to see whether it maps to anything | |
432 | */ | |
433 | static inline int gdbstub_addr_probe(const void *vaddr) | |
434 | { | |
435 | #ifdef CONFIG_MMU | |
436 | unsigned long paddr; | |
437 | ||
438 | asm("lrad %1,%0,#1,#0,#0" : "=r"(paddr) : "r"(vaddr)); | |
439 | if (!(paddr & xAMPRx_V)) | |
440 | return 0; | |
441 | #endif | |
442 | ||
443 | return 1; | |
444 | } /* end gdbstub_addr_probe() */ | |
445 | ||
446 | #ifdef CONFIG_MMU | |
447 | static unsigned long __saved_dampr, __saved_damlr; | |
448 | ||
449 | static inline unsigned long gdbstub_virt_to_pte(unsigned long vaddr) | |
450 | { | |
451 | pgd_t *pgd; | |
452 | pud_t *pud; | |
453 | pmd_t *pmd; | |
454 | pte_t *pte; | |
455 | unsigned long val, dampr5; | |
456 | ||
457 | pgd = (pgd_t *) __get_DAMLR(3) + pgd_index(vaddr); | |
458 | pud = pud_offset(pgd, vaddr); | |
459 | pmd = pmd_offset(pud, vaddr); | |
460 | ||
461 | if (pmd_bad(*pmd) || !pmd_present(*pmd)) | |
462 | return 0; | |
463 | ||
464 | /* make sure dampr5 maps to the correct pmd */ | |
465 | dampr5 = __get_DAMPR(5); | |
466 | val = pmd_val(*pmd); | |
467 | __set_DAMPR(5, val | xAMPRx_L | xAMPRx_SS_16Kb | xAMPRx_S | xAMPRx_C | xAMPRx_V); | |
468 | ||
469 | /* now its safe to access pmd */ | |
470 | pte = (pte_t *)__get_DAMLR(5) + __pte_index(vaddr); | |
471 | if (pte_present(*pte)) | |
472 | val = pte_val(*pte); | |
473 | else | |
474 | val = 0; | |
475 | ||
476 | /* restore original dampr5 */ | |
477 | __set_DAMPR(5, dampr5); | |
478 | ||
479 | return val; | |
480 | } | |
481 | #endif | |
482 | ||
483 | static inline int gdbstub_addr_map(const void *vaddr) | |
484 | { | |
485 | #ifdef CONFIG_MMU | |
486 | unsigned long pte; | |
487 | ||
488 | __saved_dampr = __get_DAMPR(2); | |
489 | __saved_damlr = __get_DAMLR(2); | |
490 | #endif | |
491 | if (gdbstub_addr_probe(vaddr)) | |
492 | return 1; | |
493 | #ifdef CONFIG_MMU | |
494 | pte = gdbstub_virt_to_pte((unsigned long) vaddr); | |
495 | if (pte) { | |
496 | __set_DAMPR(2, pte); | |
497 | __set_DAMLR(2, (unsigned long) vaddr & PAGE_MASK); | |
498 | return 1; | |
499 | } | |
500 | #endif | |
501 | return 0; | |
502 | } | |
503 | ||
504 | static inline void gdbstub_addr_unmap(void) | |
505 | { | |
506 | #ifdef CONFIG_MMU | |
507 | __set_DAMPR(2, __saved_dampr); | |
508 | __set_DAMLR(2, __saved_damlr); | |
509 | #endif | |
510 | } | |
511 | ||
512 | /* | |
513 | * access potentially dodgy memory through a potentially dodgy pointer | |
514 | */ | |
515 | static inline int gdbstub_read_dword(const void *addr, uint32_t *_res) | |
516 | { | |
517 | unsigned long brr; | |
518 | uint32_t res; | |
519 | ||
520 | if (!gdbstub_addr_map(addr)) | |
521 | return 0; | |
522 | ||
523 | asm volatile(" movgs gr0,brr \n" | |
524 | " ld%I2 %M2,%0 \n" | |
525 | " movsg brr,%1 \n" | |
526 | : "=r"(res), "=r"(brr) | |
527 | : "m"(*(uint32_t *) addr)); | |
528 | *_res = res; | |
529 | gdbstub_addr_unmap(); | |
530 | return likely(!brr); | |
531 | } | |
532 | ||
533 | static inline int gdbstub_write_dword(void *addr, uint32_t val) | |
534 | { | |
535 | unsigned long brr; | |
536 | ||
537 | if (!gdbstub_addr_map(addr)) | |
538 | return 0; | |
539 | ||
540 | asm volatile(" movgs gr0,brr \n" | |
541 | " st%I2 %1,%M2 \n" | |
542 | " movsg brr,%0 \n" | |
543 | : "=r"(brr) | |
544 | : "r"(val), "m"(*(uint32_t *) addr)); | |
545 | gdbstub_addr_unmap(); | |
546 | return likely(!brr); | |
547 | } | |
548 | ||
549 | static inline int gdbstub_read_word(const void *addr, uint16_t *_res) | |
550 | { | |
551 | unsigned long brr; | |
552 | uint16_t res; | |
553 | ||
554 | if (!gdbstub_addr_map(addr)) | |
555 | return 0; | |
556 | ||
557 | asm volatile(" movgs gr0,brr \n" | |
558 | " lduh%I2 %M2,%0 \n" | |
559 | " movsg brr,%1 \n" | |
560 | : "=r"(res), "=r"(brr) | |
561 | : "m"(*(uint16_t *) addr)); | |
562 | *_res = res; | |
563 | gdbstub_addr_unmap(); | |
564 | return likely(!brr); | |
565 | } | |
566 | ||
567 | static inline int gdbstub_write_word(void *addr, uint16_t val) | |
568 | { | |
569 | unsigned long brr; | |
570 | ||
571 | if (!gdbstub_addr_map(addr)) | |
572 | return 0; | |
573 | ||
574 | asm volatile(" movgs gr0,brr \n" | |
575 | " sth%I2 %1,%M2 \n" | |
576 | " movsg brr,%0 \n" | |
577 | : "=r"(brr) | |
578 | : "r"(val), "m"(*(uint16_t *) addr)); | |
579 | gdbstub_addr_unmap(); | |
580 | return likely(!brr); | |
581 | } | |
582 | ||
583 | static inline int gdbstub_read_byte(const void *addr, uint8_t *_res) | |
584 | { | |
585 | unsigned long brr; | |
586 | uint8_t res; | |
587 | ||
588 | if (!gdbstub_addr_map(addr)) | |
589 | return 0; | |
590 | ||
591 | asm volatile(" movgs gr0,brr \n" | |
592 | " ldub%I2 %M2,%0 \n" | |
593 | " movsg brr,%1 \n" | |
594 | : "=r"(res), "=r"(brr) | |
595 | : "m"(*(uint8_t *) addr)); | |
596 | *_res = res; | |
597 | gdbstub_addr_unmap(); | |
598 | return likely(!brr); | |
599 | } | |
600 | ||
601 | static inline int gdbstub_write_byte(void *addr, uint8_t val) | |
602 | { | |
603 | unsigned long brr; | |
604 | ||
605 | if (!gdbstub_addr_map(addr)) | |
606 | return 0; | |
607 | ||
608 | asm volatile(" movgs gr0,brr \n" | |
609 | " stb%I2 %1,%M2 \n" | |
610 | " movsg brr,%0 \n" | |
611 | : "=r"(brr) | |
612 | : "r"(val), "m"(*(uint8_t *) addr)); | |
613 | gdbstub_addr_unmap(); | |
614 | return likely(!brr); | |
615 | } | |
616 | ||
617 | static void __gdbstub_console_write(struct console *co, const char *p, unsigned n) | |
618 | { | |
619 | char outbuf[26]; | |
620 | int qty; | |
621 | ||
622 | outbuf[0] = 'O'; | |
623 | ||
624 | while (n > 0) { | |
625 | qty = 1; | |
626 | ||
627 | while (n > 0 && qty < 20) { | |
628 | mem2hex(p, outbuf + qty, 2, 0); | |
629 | qty += 2; | |
630 | if (*p == 0x0a) { | |
631 | outbuf[qty++] = '0'; | |
632 | outbuf[qty++] = 'd'; | |
633 | } | |
634 | p++; | |
635 | n--; | |
636 | } | |
637 | ||
638 | outbuf[qty] = 0; | |
639 | gdbstub_send_packet(outbuf); | |
640 | } | |
641 | } | |
642 | ||
643 | #if 0 | |
644 | void debug_to_serial(const char *p, int n) | |
645 | { | |
646 | gdbstub_console_write(NULL,p,n); | |
647 | } | |
648 | #endif | |
649 | ||
76925916 | 650 | #ifdef CONFIG_GDB_CONSOLE |
1da177e4 LT |
651 | |
652 | static struct console gdbstub_console = { | |
653 | .name = "gdb", | |
654 | .write = gdbstub_console_write, /* in break.S */ | |
1da177e4 LT |
655 | .flags = CON_PRINTBUFFER, |
656 | .index = -1, | |
657 | }; | |
658 | ||
659 | #endif | |
660 | ||
661 | /*****************************************************************************/ | |
662 | /* | |
663 | * Convert the memory pointed to by mem into hex, placing result in buf. | |
664 | * - if successful, return a pointer to the last char put in buf (NUL) | |
665 | * - in case of mem fault, return NULL | |
666 | * may_fault is non-zero if we are reading from arbitrary memory, but is currently | |
667 | * not used. | |
668 | */ | |
669 | static unsigned char *mem2hex(const void *_mem, char *buf, int count, int may_fault) | |
670 | { | |
671 | const uint8_t *mem = _mem; | |
672 | uint8_t ch[4] __attribute__((aligned(4))); | |
673 | ||
674 | if ((uint32_t)mem&1 && count>=1) { | |
675 | if (!gdbstub_read_byte(mem,ch)) | |
676 | return NULL; | |
677 | *buf++ = hexchars[ch[0] >> 4]; | |
678 | *buf++ = hexchars[ch[0] & 0xf]; | |
679 | mem++; | |
680 | count--; | |
681 | } | |
682 | ||
683 | if ((uint32_t)mem&3 && count>=2) { | |
684 | if (!gdbstub_read_word(mem,(uint16_t *)ch)) | |
685 | return NULL; | |
686 | *buf++ = hexchars[ch[0] >> 4]; | |
687 | *buf++ = hexchars[ch[0] & 0xf]; | |
688 | *buf++ = hexchars[ch[1] >> 4]; | |
689 | *buf++ = hexchars[ch[1] & 0xf]; | |
690 | mem += 2; | |
691 | count -= 2; | |
692 | } | |
693 | ||
694 | while (count>=4) { | |
695 | if (!gdbstub_read_dword(mem,(uint32_t *)ch)) | |
696 | return NULL; | |
697 | *buf++ = hexchars[ch[0] >> 4]; | |
698 | *buf++ = hexchars[ch[0] & 0xf]; | |
699 | *buf++ = hexchars[ch[1] >> 4]; | |
700 | *buf++ = hexchars[ch[1] & 0xf]; | |
701 | *buf++ = hexchars[ch[2] >> 4]; | |
702 | *buf++ = hexchars[ch[2] & 0xf]; | |
703 | *buf++ = hexchars[ch[3] >> 4]; | |
704 | *buf++ = hexchars[ch[3] & 0xf]; | |
705 | mem += 4; | |
706 | count -= 4; | |
707 | } | |
708 | ||
709 | if (count>=2) { | |
710 | if (!gdbstub_read_word(mem,(uint16_t *)ch)) | |
711 | return NULL; | |
712 | *buf++ = hexchars[ch[0] >> 4]; | |
713 | *buf++ = hexchars[ch[0] & 0xf]; | |
714 | *buf++ = hexchars[ch[1] >> 4]; | |
715 | *buf++ = hexchars[ch[1] & 0xf]; | |
716 | mem += 2; | |
717 | count -= 2; | |
718 | } | |
719 | ||
720 | if (count>=1) { | |
721 | if (!gdbstub_read_byte(mem,ch)) | |
722 | return NULL; | |
723 | *buf++ = hexchars[ch[0] >> 4]; | |
724 | *buf++ = hexchars[ch[0] & 0xf]; | |
725 | } | |
726 | ||
727 | *buf = 0; | |
728 | ||
729 | return buf; | |
730 | } /* end mem2hex() */ | |
731 | ||
732 | /*****************************************************************************/ | |
733 | /* | |
734 | * convert the hex array pointed to by buf into binary to be placed in mem | |
735 | * return a pointer to the character AFTER the last byte of buffer consumed | |
736 | */ | |
737 | static char *hex2mem(const char *buf, void *_mem, int count) | |
738 | { | |
739 | uint8_t *mem = _mem; | |
740 | union { | |
741 | uint32_t l; | |
742 | uint16_t w; | |
743 | uint8_t b[4]; | |
744 | } ch; | |
745 | ||
746 | if ((u32)mem&1 && count>=1) { | |
747 | ch.b[0] = hex(*buf++) << 4; | |
748 | ch.b[0] |= hex(*buf++); | |
749 | if (!gdbstub_write_byte(mem,ch.b[0])) | |
750 | return NULL; | |
751 | mem++; | |
752 | count--; | |
753 | } | |
754 | ||
755 | if ((u32)mem&3 && count>=2) { | |
756 | ch.b[0] = hex(*buf++) << 4; | |
757 | ch.b[0] |= hex(*buf++); | |
758 | ch.b[1] = hex(*buf++) << 4; | |
759 | ch.b[1] |= hex(*buf++); | |
760 | if (!gdbstub_write_word(mem,ch.w)) | |
761 | return NULL; | |
762 | mem += 2; | |
763 | count -= 2; | |
764 | } | |
765 | ||
766 | while (count>=4) { | |
767 | ch.b[0] = hex(*buf++) << 4; | |
768 | ch.b[0] |= hex(*buf++); | |
769 | ch.b[1] = hex(*buf++) << 4; | |
770 | ch.b[1] |= hex(*buf++); | |
771 | ch.b[2] = hex(*buf++) << 4; | |
772 | ch.b[2] |= hex(*buf++); | |
773 | ch.b[3] = hex(*buf++) << 4; | |
774 | ch.b[3] |= hex(*buf++); | |
775 | if (!gdbstub_write_dword(mem,ch.l)) | |
776 | return NULL; | |
777 | mem += 4; | |
778 | count -= 4; | |
779 | } | |
780 | ||
781 | if (count>=2) { | |
782 | ch.b[0] = hex(*buf++) << 4; | |
783 | ch.b[0] |= hex(*buf++); | |
784 | ch.b[1] = hex(*buf++) << 4; | |
785 | ch.b[1] |= hex(*buf++); | |
786 | if (!gdbstub_write_word(mem,ch.w)) | |
787 | return NULL; | |
788 | mem += 2; | |
789 | count -= 2; | |
790 | } | |
791 | ||
792 | if (count>=1) { | |
793 | ch.b[0] = hex(*buf++) << 4; | |
794 | ch.b[0] |= hex(*buf++); | |
795 | if (!gdbstub_write_byte(mem,ch.b[0])) | |
796 | return NULL; | |
797 | } | |
798 | ||
799 | return (char *) buf; | |
800 | } /* end hex2mem() */ | |
801 | ||
802 | /*****************************************************************************/ | |
803 | /* | |
804 | * This table contains the mapping between FRV TBR.TT exception codes, | |
805 | * and signals, which are primarily what GDB understands. It also | |
806 | * indicates which hardware traps we need to commandeer when | |
807 | * initializing the stub. | |
808 | */ | |
809 | static const struct brr_to_sig_map { | |
810 | unsigned long brr_mask; /* BRR bitmask */ | |
811 | unsigned long tbr_tt; /* TBR.TT code (in BRR.EBTT) */ | |
812 | unsigned int signo; /* Signal that we map this into */ | |
813 | } brr_to_sig_map[] = { | |
814 | { BRR_EB, TBR_TT_INSTR_ACC_ERROR, SIGSEGV }, | |
815 | { BRR_EB, TBR_TT_ILLEGAL_INSTR, SIGILL }, | |
816 | { BRR_EB, TBR_TT_PRIV_INSTR, SIGILL }, | |
817 | { BRR_EB, TBR_TT_MP_EXCEPTION, SIGFPE }, | |
818 | { BRR_EB, TBR_TT_DATA_ACC_ERROR, SIGSEGV }, | |
819 | { BRR_EB, TBR_TT_DATA_STR_ERROR, SIGSEGV }, | |
820 | { BRR_EB, TBR_TT_DIVISION_EXCEP, SIGFPE }, | |
821 | { BRR_EB, TBR_TT_COMPOUND_EXCEP, SIGSEGV }, | |
822 | { BRR_EB, TBR_TT_INTERRUPT_13, SIGALRM }, /* watchdog */ | |
823 | { BRR_EB, TBR_TT_INTERRUPT_14, SIGINT }, /* GDB serial */ | |
824 | { BRR_EB, TBR_TT_INTERRUPT_15, SIGQUIT }, /* NMI */ | |
825 | { BRR_CB, 0, SIGUSR1 }, | |
826 | { BRR_TB, 0, SIGUSR2 }, | |
827 | { BRR_DBNEx, 0, SIGTRAP }, | |
828 | { BRR_DBx, 0, SIGTRAP }, /* h/w watchpoint */ | |
829 | { BRR_IBx, 0, SIGTRAP }, /* h/w breakpoint */ | |
830 | { BRR_CBB, 0, SIGTRAP }, | |
831 | { BRR_SB, 0, SIGTRAP }, | |
832 | { BRR_ST, 0, SIGTRAP }, /* single step */ | |
833 | { 0, 0, SIGHUP } /* default */ | |
834 | }; | |
835 | ||
836 | /*****************************************************************************/ | |
837 | /* | |
838 | * convert the FRV BRR register contents into a UNIX signal number | |
839 | */ | |
840 | static inline int gdbstub_compute_signal(unsigned long brr) | |
841 | { | |
842 | const struct brr_to_sig_map *map; | |
843 | unsigned long tbr = (brr & BRR_EBTT) >> 12; | |
844 | ||
845 | for (map = brr_to_sig_map; map->brr_mask; map++) | |
846 | if (map->brr_mask & brr) | |
847 | if (!map->tbr_tt || map->tbr_tt == tbr) | |
848 | break; | |
849 | ||
850 | return map->signo; | |
851 | } /* end gdbstub_compute_signal() */ | |
852 | ||
853 | /*****************************************************************************/ | |
854 | /* | |
855 | * set a software breakpoint or a hardware breakpoint or watchpoint | |
856 | */ | |
857 | static int gdbstub_set_breakpoint(unsigned long type, unsigned long addr, unsigned long len) | |
858 | { | |
859 | unsigned long tmp; | |
860 | int bkpt, loop, xloop; | |
861 | ||
862 | union { | |
863 | struct { | |
864 | unsigned long mask0, mask1; | |
865 | }; | |
866 | uint8_t bytes[8]; | |
867 | } dbmr; | |
868 | ||
869 | //gdbstub_printk("setbkpt(%ld,%08lx,%ld)\n", type, addr, len); | |
870 | ||
871 | switch (type) { | |
872 | /* set software breakpoint */ | |
873 | case 0: | |
874 | if (addr & 3 || len > 7*4) | |
875 | return -EINVAL; | |
876 | ||
877 | for (bkpt = 255; bkpt >= 0; bkpt--) | |
878 | if (!gdbstub_bkpts[bkpt].addr) | |
879 | break; | |
880 | if (bkpt < 0) | |
881 | return -ENOSPC; | |
882 | ||
883 | for (loop = 0; loop < len/4; loop++) | |
884 | if (!gdbstub_read_dword(&((uint32_t *) addr)[loop], | |
885 | &gdbstub_bkpts[bkpt].originsns[loop])) | |
886 | return -EFAULT; | |
887 | ||
888 | for (loop = 0; loop < len/4; loop++) | |
889 | if (!gdbstub_write_dword(&((uint32_t *) addr)[loop], | |
890 | BREAK_INSN) | |
891 | ) { | |
892 | /* need to undo the changes if possible */ | |
893 | for (xloop = 0; xloop < loop; xloop++) | |
894 | gdbstub_write_dword(&((uint32_t *) addr)[xloop], | |
895 | gdbstub_bkpts[bkpt].originsns[xloop]); | |
896 | return -EFAULT; | |
897 | } | |
898 | ||
899 | gdbstub_bkpts[bkpt].addr = addr; | |
900 | gdbstub_bkpts[bkpt].len = len; | |
901 | ||
902 | #if 0 | |
903 | gdbstub_printk("Set BKPT[%02x]: %08lx #%d {%04x, %04x} -> { %04x, %04x }\n", | |
904 | bkpt, | |
905 | gdbstub_bkpts[bkpt].addr, | |
906 | gdbstub_bkpts[bkpt].len, | |
907 | gdbstub_bkpts[bkpt].originsns[0], | |
908 | gdbstub_bkpts[bkpt].originsns[1], | |
909 | ((uint32_t *) addr)[0], | |
910 | ((uint32_t *) addr)[1] | |
911 | ); | |
912 | #endif | |
913 | return 0; | |
914 | ||
915 | /* set hardware breakpoint */ | |
916 | case 1: | |
917 | if (addr & 3 || len != 4) | |
918 | return -EINVAL; | |
919 | ||
920 | if (!(__debug_regs->dcr & DCR_IBE0)) { | |
921 | //gdbstub_printk("set h/w break 0: %08lx\n", addr); | |
922 | __debug_regs->dcr |= DCR_IBE0; | |
84e8cd6d | 923 | __debug_regs->ibar[0] = addr; |
1da177e4 LT |
924 | asm volatile("movgs %0,ibar0" : : "r"(addr)); |
925 | return 0; | |
926 | } | |
927 | ||
928 | if (!(__debug_regs->dcr & DCR_IBE1)) { | |
929 | //gdbstub_printk("set h/w break 1: %08lx\n", addr); | |
930 | __debug_regs->dcr |= DCR_IBE1; | |
84e8cd6d | 931 | __debug_regs->ibar[1] = addr; |
1da177e4 LT |
932 | asm volatile("movgs %0,ibar1" : : "r"(addr)); |
933 | return 0; | |
934 | } | |
935 | ||
936 | if (!(__debug_regs->dcr & DCR_IBE2)) { | |
937 | //gdbstub_printk("set h/w break 2: %08lx\n", addr); | |
938 | __debug_regs->dcr |= DCR_IBE2; | |
84e8cd6d | 939 | __debug_regs->ibar[2] = addr; |
1da177e4 LT |
940 | asm volatile("movgs %0,ibar2" : : "r"(addr)); |
941 | return 0; | |
942 | } | |
943 | ||
944 | if (!(__debug_regs->dcr & DCR_IBE3)) { | |
945 | //gdbstub_printk("set h/w break 3: %08lx\n", addr); | |
946 | __debug_regs->dcr |= DCR_IBE3; | |
84e8cd6d | 947 | __debug_regs->ibar[3] = addr; |
1da177e4 LT |
948 | asm volatile("movgs %0,ibar3" : : "r"(addr)); |
949 | return 0; | |
950 | } | |
951 | ||
952 | return -ENOSPC; | |
953 | ||
954 | /* set data read/write/access watchpoint */ | |
955 | case 2: | |
956 | case 3: | |
957 | case 4: | |
958 | if ((addr & ~7) != ((addr + len - 1) & ~7)) | |
959 | return -EINVAL; | |
960 | ||
961 | tmp = addr & 7; | |
962 | ||
963 | memset(dbmr.bytes, 0xff, sizeof(dbmr.bytes)); | |
964 | for (loop = 0; loop < len; loop++) | |
965 | dbmr.bytes[tmp + loop] = 0; | |
966 | ||
967 | addr &= ~7; | |
968 | ||
969 | if (!(__debug_regs->dcr & (DCR_DRBE0|DCR_DWBE0))) { | |
970 | //gdbstub_printk("set h/w watchpoint 0 type %ld: %08lx\n", type, addr); | |
971 | tmp = type==2 ? DCR_DWBE0 : type==3 ? DCR_DRBE0 : DCR_DRBE0|DCR_DWBE0; | |
84e8cd6d | 972 | |
1da177e4 | 973 | __debug_regs->dcr |= tmp; |
84e8cd6d DH |
974 | __debug_regs->dbar[0] = addr; |
975 | __debug_regs->dbmr[0][0] = dbmr.mask0; | |
976 | __debug_regs->dbmr[0][1] = dbmr.mask1; | |
977 | __debug_regs->dbdr[0][0] = 0; | |
978 | __debug_regs->dbdr[0][1] = 0; | |
979 | ||
1da177e4 LT |
980 | asm volatile(" movgs %0,dbar0 \n" |
981 | " movgs %1,dbmr00 \n" | |
982 | " movgs %2,dbmr01 \n" | |
983 | " movgs gr0,dbdr00 \n" | |
984 | " movgs gr0,dbdr01 \n" | |
985 | : : "r"(addr), "r"(dbmr.mask0), "r"(dbmr.mask1)); | |
986 | return 0; | |
987 | } | |
988 | ||
989 | if (!(__debug_regs->dcr & (DCR_DRBE1|DCR_DWBE1))) { | |
990 | //gdbstub_printk("set h/w watchpoint 1 type %ld: %08lx\n", type, addr); | |
991 | tmp = type==2 ? DCR_DWBE1 : type==3 ? DCR_DRBE1 : DCR_DRBE1|DCR_DWBE1; | |
84e8cd6d | 992 | |
1da177e4 | 993 | __debug_regs->dcr |= tmp; |
84e8cd6d DH |
994 | __debug_regs->dbar[1] = addr; |
995 | __debug_regs->dbmr[1][0] = dbmr.mask0; | |
996 | __debug_regs->dbmr[1][1] = dbmr.mask1; | |
997 | __debug_regs->dbdr[1][0] = 0; | |
998 | __debug_regs->dbdr[1][1] = 0; | |
999 | ||
1da177e4 LT |
1000 | asm volatile(" movgs %0,dbar1 \n" |
1001 | " movgs %1,dbmr10 \n" | |
1002 | " movgs %2,dbmr11 \n" | |
1003 | " movgs gr0,dbdr10 \n" | |
1004 | " movgs gr0,dbdr11 \n" | |
1005 | : : "r"(addr), "r"(dbmr.mask0), "r"(dbmr.mask1)); | |
1006 | return 0; | |
1007 | } | |
1008 | ||
1009 | return -ENOSPC; | |
1010 | ||
1011 | default: | |
1012 | return -EINVAL; | |
1013 | } | |
1014 | ||
1015 | } /* end gdbstub_set_breakpoint() */ | |
1016 | ||
1017 | /*****************************************************************************/ | |
1018 | /* | |
1019 | * clear a breakpoint or watchpoint | |
1020 | */ | |
1021 | int gdbstub_clear_breakpoint(unsigned long type, unsigned long addr, unsigned long len) | |
1022 | { | |
1023 | unsigned long tmp; | |
1024 | int bkpt, loop; | |
1025 | ||
1026 | union { | |
1027 | struct { | |
1028 | unsigned long mask0, mask1; | |
1029 | }; | |
1030 | uint8_t bytes[8]; | |
1031 | } dbmr; | |
1032 | ||
1033 | //gdbstub_printk("clearbkpt(%ld,%08lx,%ld)\n", type, addr, len); | |
1034 | ||
1035 | switch (type) { | |
1036 | /* clear software breakpoint */ | |
1037 | case 0: | |
1038 | for (bkpt = 255; bkpt >= 0; bkpt--) | |
1039 | if (gdbstub_bkpts[bkpt].addr == addr && gdbstub_bkpts[bkpt].len == len) | |
1040 | break; | |
1041 | if (bkpt < 0) | |
1042 | return -ENOENT; | |
1043 | ||
1044 | gdbstub_bkpts[bkpt].addr = 0; | |
1045 | ||
1046 | for (loop = 0; loop < len/4; loop++) | |
1047 | if (!gdbstub_write_dword(&((uint32_t *) addr)[loop], | |
1048 | gdbstub_bkpts[bkpt].originsns[loop])) | |
1049 | return -EFAULT; | |
1050 | return 0; | |
1051 | ||
1052 | /* clear hardware breakpoint */ | |
1053 | case 1: | |
1054 | if (addr & 3 || len != 4) | |
1055 | return -EINVAL; | |
1056 | ||
1057 | #define __get_ibar(X) ({ unsigned long x; asm volatile("movsg ibar"#X",%0" : "=r"(x)); x; }) | |
1058 | ||
1059 | if (__debug_regs->dcr & DCR_IBE0 && __get_ibar(0) == addr) { | |
1060 | //gdbstub_printk("clear h/w break 0: %08lx\n", addr); | |
1061 | __debug_regs->dcr &= ~DCR_IBE0; | |
84e8cd6d | 1062 | __debug_regs->ibar[0] = 0; |
1da177e4 LT |
1063 | asm volatile("movgs gr0,ibar0"); |
1064 | return 0; | |
1065 | } | |
1066 | ||
1067 | if (__debug_regs->dcr & DCR_IBE1 && __get_ibar(1) == addr) { | |
1068 | //gdbstub_printk("clear h/w break 1: %08lx\n", addr); | |
1069 | __debug_regs->dcr &= ~DCR_IBE1; | |
84e8cd6d | 1070 | __debug_regs->ibar[1] = 0; |
1da177e4 LT |
1071 | asm volatile("movgs gr0,ibar1"); |
1072 | return 0; | |
1073 | } | |
1074 | ||
1075 | if (__debug_regs->dcr & DCR_IBE2 && __get_ibar(2) == addr) { | |
1076 | //gdbstub_printk("clear h/w break 2: %08lx\n", addr); | |
1077 | __debug_regs->dcr &= ~DCR_IBE2; | |
84e8cd6d | 1078 | __debug_regs->ibar[2] = 0; |
1da177e4 LT |
1079 | asm volatile("movgs gr0,ibar2"); |
1080 | return 0; | |
1081 | } | |
1082 | ||
1083 | if (__debug_regs->dcr & DCR_IBE3 && __get_ibar(3) == addr) { | |
1084 | //gdbstub_printk("clear h/w break 3: %08lx\n", addr); | |
1085 | __debug_regs->dcr &= ~DCR_IBE3; | |
84e8cd6d | 1086 | __debug_regs->ibar[3] = 0; |
1da177e4 LT |
1087 | asm volatile("movgs gr0,ibar3"); |
1088 | return 0; | |
1089 | } | |
1090 | ||
1091 | return -EINVAL; | |
1092 | ||
1093 | /* clear data read/write/access watchpoint */ | |
1094 | case 2: | |
1095 | case 3: | |
1096 | case 4: | |
1097 | if ((addr & ~7) != ((addr + len - 1) & ~7)) | |
1098 | return -EINVAL; | |
1099 | ||
1100 | tmp = addr & 7; | |
1101 | ||
1102 | memset(dbmr.bytes, 0xff, sizeof(dbmr.bytes)); | |
1103 | for (loop = 0; loop < len; loop++) | |
1104 | dbmr.bytes[tmp + loop] = 0; | |
1105 | ||
1106 | addr &= ~7; | |
1107 | ||
1108 | #define __get_dbar(X) ({ unsigned long x; asm volatile("movsg dbar"#X",%0" : "=r"(x)); x; }) | |
1109 | #define __get_dbmr0(X) ({ unsigned long x; asm volatile("movsg dbmr"#X"0,%0" : "=r"(x)); x; }) | |
1110 | #define __get_dbmr1(X) ({ unsigned long x; asm volatile("movsg dbmr"#X"1,%0" : "=r"(x)); x; }) | |
1111 | ||
1112 | /* consider DBAR 0 */ | |
1113 | tmp = type==2 ? DCR_DWBE0 : type==3 ? DCR_DRBE0 : DCR_DRBE0|DCR_DWBE0; | |
1114 | ||
1115 | if ((__debug_regs->dcr & (DCR_DRBE0|DCR_DWBE0)) != tmp || | |
1116 | __get_dbar(0) != addr || | |
1117 | __get_dbmr0(0) != dbmr.mask0 || | |
1118 | __get_dbmr1(0) != dbmr.mask1) | |
1119 | goto skip_dbar0; | |
1120 | ||
1121 | //gdbstub_printk("clear h/w watchpoint 0 type %ld: %08lx\n", type, addr); | |
1122 | __debug_regs->dcr &= ~(DCR_DRBE0|DCR_DWBE0); | |
84e8cd6d DH |
1123 | __debug_regs->dbar[0] = 0; |
1124 | __debug_regs->dbmr[0][0] = 0; | |
1125 | __debug_regs->dbmr[0][1] = 0; | |
1126 | __debug_regs->dbdr[0][0] = 0; | |
1127 | __debug_regs->dbdr[0][1] = 0; | |
1128 | ||
1da177e4 LT |
1129 | asm volatile(" movgs gr0,dbar0 \n" |
1130 | " movgs gr0,dbmr00 \n" | |
1131 | " movgs gr0,dbmr01 \n" | |
1132 | " movgs gr0,dbdr00 \n" | |
1133 | " movgs gr0,dbdr01 \n"); | |
1134 | return 0; | |
1135 | ||
1136 | skip_dbar0: | |
1137 | /* consider DBAR 0 */ | |
1138 | tmp = type==2 ? DCR_DWBE1 : type==3 ? DCR_DRBE1 : DCR_DRBE1|DCR_DWBE1; | |
1139 | ||
1140 | if ((__debug_regs->dcr & (DCR_DRBE1|DCR_DWBE1)) != tmp || | |
1141 | __get_dbar(1) != addr || | |
1142 | __get_dbmr0(1) != dbmr.mask0 || | |
1143 | __get_dbmr1(1) != dbmr.mask1) | |
1144 | goto skip_dbar1; | |
1145 | ||
1146 | //gdbstub_printk("clear h/w watchpoint 1 type %ld: %08lx\n", type, addr); | |
1147 | __debug_regs->dcr &= ~(DCR_DRBE1|DCR_DWBE1); | |
84e8cd6d DH |
1148 | __debug_regs->dbar[1] = 0; |
1149 | __debug_regs->dbmr[1][0] = 0; | |
1150 | __debug_regs->dbmr[1][1] = 0; | |
1151 | __debug_regs->dbdr[1][0] = 0; | |
1152 | __debug_regs->dbdr[1][1] = 0; | |
1153 | ||
1da177e4 LT |
1154 | asm volatile(" movgs gr0,dbar1 \n" |
1155 | " movgs gr0,dbmr10 \n" | |
1156 | " movgs gr0,dbmr11 \n" | |
1157 | " movgs gr0,dbdr10 \n" | |
1158 | " movgs gr0,dbdr11 \n"); | |
1159 | return 0; | |
1160 | ||
1161 | skip_dbar1: | |
1162 | return -ENOSPC; | |
1163 | ||
1164 | default: | |
1165 | return -EINVAL; | |
1166 | } | |
1167 | } /* end gdbstub_clear_breakpoint() */ | |
1168 | ||
1169 | /*****************************************************************************/ | |
1170 | /* | |
1171 | * check a for an internal software breakpoint, and wind the PC back if necessary | |
1172 | */ | |
1173 | static void gdbstub_check_breakpoint(void) | |
1174 | { | |
1175 | unsigned long addr = __debug_frame->pc - 4; | |
1176 | int bkpt; | |
1177 | ||
1178 | for (bkpt = 255; bkpt >= 0; bkpt--) | |
1179 | if (gdbstub_bkpts[bkpt].addr == addr) | |
1180 | break; | |
1181 | if (bkpt >= 0) | |
1182 | __debug_frame->pc = addr; | |
1183 | ||
1184 | //gdbstub_printk("alter pc [%d] %08lx\n", bkpt, __debug_frame->pc); | |
1185 | ||
1186 | } /* end gdbstub_check_breakpoint() */ | |
1187 | ||
1188 | /*****************************************************************************/ | |
1189 | /* | |
1190 | * | |
1191 | */ | |
0a9d6e7c | 1192 | static void __maybe_unused gdbstub_show_regs(void) |
1da177e4 | 1193 | { |
84e8cd6d | 1194 | unsigned long *reg; |
1da177e4 LT |
1195 | int loop; |
1196 | ||
1197 | gdbstub_printk("\n"); | |
1198 | ||
1199 | gdbstub_printk("Frame: @%p [%s]\n", | |
1200 | __debug_frame, | |
1201 | __debug_frame->psr & PSR_S ? "kernel" : "user"); | |
1202 | ||
84e8cd6d DH |
1203 | reg = (unsigned long *) __debug_frame; |
1204 | for (loop = 0; loop < NR_PT_REGS; loop++) { | |
1205 | printk("%s %08lx", regnames[loop + 0], reg[loop + 0]); | |
1da177e4 | 1206 | |
84e8cd6d | 1207 | if (loop == NR_PT_REGS - 1 || loop % 5 == 4) |
1da177e4 LT |
1208 | printk("\n"); |
1209 | else | |
1210 | printk(" | "); | |
1211 | } | |
1212 | ||
1213 | gdbstub_printk("Process %s (pid: %d)\n", current->comm, current->pid); | |
1214 | } /* end gdbstub_show_regs() */ | |
1215 | ||
1216 | /*****************************************************************************/ | |
1217 | /* | |
1218 | * dump debugging regs | |
1219 | */ | |
0a9d6e7c | 1220 | static void __maybe_unused gdbstub_dump_debugregs(void) |
1da177e4 | 1221 | { |
84e8cd6d DH |
1222 | gdbstub_printk("DCR %08lx ", __debug_status.dcr); |
1223 | gdbstub_printk("BRR %08lx\n", __debug_status.brr); | |
1da177e4 LT |
1224 | |
1225 | gdbstub_printk("IBAR0 %08lx ", __get_ibar(0)); | |
1226 | gdbstub_printk("IBAR1 %08lx ", __get_ibar(1)); | |
1227 | gdbstub_printk("IBAR2 %08lx ", __get_ibar(2)); | |
1228 | gdbstub_printk("IBAR3 %08lx\n", __get_ibar(3)); | |
1229 | ||
1230 | gdbstub_printk("DBAR0 %08lx ", __get_dbar(0)); | |
1231 | gdbstub_printk("DBMR00 %08lx ", __get_dbmr0(0)); | |
1232 | gdbstub_printk("DBMR01 %08lx\n", __get_dbmr1(0)); | |
1233 | ||
1234 | gdbstub_printk("DBAR1 %08lx ", __get_dbar(1)); | |
1235 | gdbstub_printk("DBMR10 %08lx ", __get_dbmr0(1)); | |
1236 | gdbstub_printk("DBMR11 %08lx\n", __get_dbmr1(1)); | |
1237 | ||
1238 | gdbstub_printk("\n"); | |
1239 | } /* end gdbstub_dump_debugregs() */ | |
1240 | ||
1241 | /*****************************************************************************/ | |
1242 | /* | |
1243 | * dump the MMU state into a structure so that it can be accessed with GDB | |
1244 | */ | |
1245 | void gdbstub_get_mmu_state(void) | |
1246 | { | |
1247 | asm volatile("movsg hsr0,%0" : "=r"(__debug_mmu.regs.hsr0)); | |
1248 | asm volatile("movsg pcsr,%0" : "=r"(__debug_mmu.regs.pcsr)); | |
1249 | asm volatile("movsg esr0,%0" : "=r"(__debug_mmu.regs.esr0)); | |
1250 | asm volatile("movsg ear0,%0" : "=r"(__debug_mmu.regs.ear0)); | |
1251 | asm volatile("movsg epcr0,%0" : "=r"(__debug_mmu.regs.epcr0)); | |
1252 | ||
1253 | /* read the protection / SAT registers */ | |
1254 | __debug_mmu.iamr[0].L = __get_IAMLR(0); | |
1255 | __debug_mmu.iamr[0].P = __get_IAMPR(0); | |
1256 | __debug_mmu.iamr[1].L = __get_IAMLR(1); | |
1257 | __debug_mmu.iamr[1].P = __get_IAMPR(1); | |
1258 | __debug_mmu.iamr[2].L = __get_IAMLR(2); | |
1259 | __debug_mmu.iamr[2].P = __get_IAMPR(2); | |
1260 | __debug_mmu.iamr[3].L = __get_IAMLR(3); | |
1261 | __debug_mmu.iamr[3].P = __get_IAMPR(3); | |
1262 | __debug_mmu.iamr[4].L = __get_IAMLR(4); | |
1263 | __debug_mmu.iamr[4].P = __get_IAMPR(4); | |
1264 | __debug_mmu.iamr[5].L = __get_IAMLR(5); | |
1265 | __debug_mmu.iamr[5].P = __get_IAMPR(5); | |
1266 | __debug_mmu.iamr[6].L = __get_IAMLR(6); | |
1267 | __debug_mmu.iamr[6].P = __get_IAMPR(6); | |
1268 | __debug_mmu.iamr[7].L = __get_IAMLR(7); | |
1269 | __debug_mmu.iamr[7].P = __get_IAMPR(7); | |
1270 | __debug_mmu.iamr[8].L = __get_IAMLR(8); | |
1271 | __debug_mmu.iamr[8].P = __get_IAMPR(8); | |
1272 | __debug_mmu.iamr[9].L = __get_IAMLR(9); | |
1273 | __debug_mmu.iamr[9].P = __get_IAMPR(9); | |
1274 | __debug_mmu.iamr[10].L = __get_IAMLR(10); | |
1275 | __debug_mmu.iamr[10].P = __get_IAMPR(10); | |
1276 | __debug_mmu.iamr[11].L = __get_IAMLR(11); | |
1277 | __debug_mmu.iamr[11].P = __get_IAMPR(11); | |
1278 | __debug_mmu.iamr[12].L = __get_IAMLR(12); | |
1279 | __debug_mmu.iamr[12].P = __get_IAMPR(12); | |
1280 | __debug_mmu.iamr[13].L = __get_IAMLR(13); | |
1281 | __debug_mmu.iamr[13].P = __get_IAMPR(13); | |
1282 | __debug_mmu.iamr[14].L = __get_IAMLR(14); | |
1283 | __debug_mmu.iamr[14].P = __get_IAMPR(14); | |
1284 | __debug_mmu.iamr[15].L = __get_IAMLR(15); | |
1285 | __debug_mmu.iamr[15].P = __get_IAMPR(15); | |
1286 | ||
1287 | __debug_mmu.damr[0].L = __get_DAMLR(0); | |
1288 | __debug_mmu.damr[0].P = __get_DAMPR(0); | |
1289 | __debug_mmu.damr[1].L = __get_DAMLR(1); | |
1290 | __debug_mmu.damr[1].P = __get_DAMPR(1); | |
1291 | __debug_mmu.damr[2].L = __get_DAMLR(2); | |
1292 | __debug_mmu.damr[2].P = __get_DAMPR(2); | |
1293 | __debug_mmu.damr[3].L = __get_DAMLR(3); | |
1294 | __debug_mmu.damr[3].P = __get_DAMPR(3); | |
1295 | __debug_mmu.damr[4].L = __get_DAMLR(4); | |
1296 | __debug_mmu.damr[4].P = __get_DAMPR(4); | |
1297 | __debug_mmu.damr[5].L = __get_DAMLR(5); | |
1298 | __debug_mmu.damr[5].P = __get_DAMPR(5); | |
1299 | __debug_mmu.damr[6].L = __get_DAMLR(6); | |
1300 | __debug_mmu.damr[6].P = __get_DAMPR(6); | |
1301 | __debug_mmu.damr[7].L = __get_DAMLR(7); | |
1302 | __debug_mmu.damr[7].P = __get_DAMPR(7); | |
1303 | __debug_mmu.damr[8].L = __get_DAMLR(8); | |
1304 | __debug_mmu.damr[8].P = __get_DAMPR(8); | |
1305 | __debug_mmu.damr[9].L = __get_DAMLR(9); | |
1306 | __debug_mmu.damr[9].P = __get_DAMPR(9); | |
1307 | __debug_mmu.damr[10].L = __get_DAMLR(10); | |
1308 | __debug_mmu.damr[10].P = __get_DAMPR(10); | |
1309 | __debug_mmu.damr[11].L = __get_DAMLR(11); | |
1310 | __debug_mmu.damr[11].P = __get_DAMPR(11); | |
1311 | __debug_mmu.damr[12].L = __get_DAMLR(12); | |
1312 | __debug_mmu.damr[12].P = __get_DAMPR(12); | |
1313 | __debug_mmu.damr[13].L = __get_DAMLR(13); | |
1314 | __debug_mmu.damr[13].P = __get_DAMPR(13); | |
1315 | __debug_mmu.damr[14].L = __get_DAMLR(14); | |
1316 | __debug_mmu.damr[14].P = __get_DAMPR(14); | |
1317 | __debug_mmu.damr[15].L = __get_DAMLR(15); | |
1318 | __debug_mmu.damr[15].P = __get_DAMPR(15); | |
1319 | ||
1320 | #ifdef CONFIG_MMU | |
1321 | do { | |
1322 | /* read the DAT entries from the TLB */ | |
1323 | struct __debug_amr *p; | |
1324 | int loop; | |
1325 | ||
1326 | asm volatile("movsg tplr,%0" : "=r"(__debug_mmu.regs.tplr)); | |
1327 | asm volatile("movsg tppr,%0" : "=r"(__debug_mmu.regs.tppr)); | |
1328 | asm volatile("movsg tpxr,%0" : "=r"(__debug_mmu.regs.tpxr)); | |
1329 | asm volatile("movsg cxnr,%0" : "=r"(__debug_mmu.regs.cxnr)); | |
1330 | ||
1331 | p = __debug_mmu.tlb; | |
1332 | ||
1333 | /* way 0 */ | |
1334 | asm volatile("movgs %0,tpxr" :: "r"(0 << TPXR_WAY_SHIFT)); | |
1335 | for (loop = 0; loop < 64; loop++) { | |
1336 | asm volatile("tlbpr %0,gr0,#1,#0" :: "r"(loop << PAGE_SHIFT)); | |
1337 | asm volatile("movsg tplr,%0" : "=r"(p->L)); | |
1338 | asm volatile("movsg tppr,%0" : "=r"(p->P)); | |
1339 | p++; | |
1340 | } | |
1341 | ||
1342 | /* way 1 */ | |
1343 | asm volatile("movgs %0,tpxr" :: "r"(1 << TPXR_WAY_SHIFT)); | |
1344 | for (loop = 0; loop < 64; loop++) { | |
1345 | asm volatile("tlbpr %0,gr0,#1,#0" :: "r"(loop << PAGE_SHIFT)); | |
1346 | asm volatile("movsg tplr,%0" : "=r"(p->L)); | |
1347 | asm volatile("movsg tppr,%0" : "=r"(p->P)); | |
1348 | p++; | |
1349 | } | |
1350 | ||
1351 | asm volatile("movgs %0,tplr" :: "r"(__debug_mmu.regs.tplr)); | |
1352 | asm volatile("movgs %0,tppr" :: "r"(__debug_mmu.regs.tppr)); | |
1353 | asm volatile("movgs %0,tpxr" :: "r"(__debug_mmu.regs.tpxr)); | |
1354 | } while(0); | |
1355 | #endif | |
1356 | ||
1357 | } /* end gdbstub_get_mmu_state() */ | |
1358 | ||
1359 | /*****************************************************************************/ | |
1360 | /* | |
1361 | * handle event interception and GDB remote protocol processing | |
1362 | * - on entry: | |
1363 | * PSR.ET==0, PSR.S==1 and the CPU is in debug mode | |
1364 | * __debug_frame points to the saved registers | |
1365 | * __frame points to the kernel mode exception frame, if it was in kernel | |
1366 | * mode when the break happened | |
1367 | */ | |
1368 | void gdbstub(int sigval) | |
1369 | { | |
1370 | unsigned long addr, length, loop, dbar, temp, temp2, temp3; | |
1371 | uint32_t zero; | |
1372 | char *ptr; | |
1373 | int flush_cache = 0; | |
1374 | ||
1375 | LEDS(0x5000); | |
1376 | ||
1377 | if (sigval < 0) { | |
1378 | #ifndef CONFIG_GDBSTUB_IMMEDIATE | |
1379 | /* return immediately if GDB immediate activation option not set */ | |
1380 | return; | |
1381 | #else | |
1382 | sigval = SIGINT; | |
1383 | #endif | |
1384 | } | |
1385 | ||
84e8cd6d | 1386 | save_user_regs(&__debug_frame0->uc); |
1da177e4 LT |
1387 | |
1388 | #if 0 | |
1389 | gdbstub_printk("--> gdbstub() %08x %p %08x %08x\n", | |
1390 | __debug_frame->pc, | |
1391 | __debug_frame, | |
1392 | __debug_regs->brr, | |
1393 | __debug_regs->bpsr); | |
1394 | // gdbstub_show_regs(); | |
1395 | #endif | |
1396 | ||
1397 | LEDS(0x5001); | |
1398 | ||
1399 | /* if we were interrupted by input on the serial gdbstub serial port, | |
1400 | * restore the context prior to the interrupt so that we return to that | |
1401 | * directly | |
1402 | */ | |
1403 | temp = (unsigned long) __entry_kerneltrap_table; | |
1404 | temp2 = (unsigned long) __entry_usertrap_table; | |
1405 | temp3 = __debug_frame->pc & ~15; | |
1406 | ||
1407 | if (temp3 == temp + TBR_TT_INTERRUPT_15 || | |
1408 | temp3 == temp2 + TBR_TT_INTERRUPT_15 | |
1409 | ) { | |
1410 | asm volatile("movsg pcsr,%0" : "=r"(__debug_frame->pc)); | |
1411 | __debug_frame->psr |= PSR_ET; | |
1412 | __debug_frame->psr &= ~PSR_S; | |
1413 | if (__debug_frame->psr & PSR_PS) | |
1414 | __debug_frame->psr |= PSR_S; | |
84e8cd6d DH |
1415 | __debug_status.brr = (__debug_frame->tbr & TBR_TT) << 12; |
1416 | __debug_status.brr |= BRR_EB; | |
1da177e4 LT |
1417 | sigval = SIGINT; |
1418 | } | |
1419 | ||
1420 | /* handle the decrement timer going off (FR451 only) */ | |
1421 | if (temp3 == temp + TBR_TT_DECREMENT_TIMER || | |
1422 | temp3 == temp2 + TBR_TT_DECREMENT_TIMER | |
1423 | ) { | |
1424 | asm volatile("movgs %0,timerd" :: "r"(10000000)); | |
1425 | asm volatile("movsg pcsr,%0" : "=r"(__debug_frame->pc)); | |
1426 | __debug_frame->psr |= PSR_ET; | |
1427 | __debug_frame->psr &= ~PSR_S; | |
1428 | if (__debug_frame->psr & PSR_PS) | |
1429 | __debug_frame->psr |= PSR_S; | |
84e8cd6d DH |
1430 | __debug_status.brr = (__debug_frame->tbr & TBR_TT) << 12; |
1431 | __debug_status.brr |= BRR_EB; | |
53b3531b | 1432 | sigval = SIGXCPU; |
1da177e4 LT |
1433 | } |
1434 | ||
1435 | LEDS(0x5002); | |
1436 | ||
1437 | /* after a BREAK insn, the PC lands on the far side of it */ | |
84e8cd6d | 1438 | if (__debug_status.brr & BRR_SB) |
1da177e4 LT |
1439 | gdbstub_check_breakpoint(); |
1440 | ||
1441 | LEDS(0x5003); | |
1442 | ||
1443 | /* handle attempts to write console data via GDB "O" commands */ | |
1444 | if (__debug_frame->pc == (unsigned long) gdbstub_console_write + 4) { | |
1445 | __gdbstub_console_write((struct console *) __debug_frame->gr8, | |
1446 | (const char *) __debug_frame->gr9, | |
1447 | (unsigned) __debug_frame->gr10); | |
1448 | goto done; | |
1449 | } | |
1450 | ||
1451 | if (gdbstub_rx_unget) { | |
1452 | sigval = SIGINT; | |
1453 | goto packet_waiting; | |
1454 | } | |
1455 | ||
1456 | if (!sigval) | |
84e8cd6d | 1457 | sigval = gdbstub_compute_signal(__debug_status.brr); |
1da177e4 LT |
1458 | |
1459 | LEDS(0x5004); | |
1460 | ||
1461 | /* send a message to the debugger's user saying what happened if it may | |
1462 | * not be clear cut (we can't map exceptions onto signals properly) | |
1463 | */ | |
1464 | if (sigval != SIGINT && sigval != SIGTRAP && sigval != SIGILL) { | |
1465 | static const char title[] = "Break "; | |
1466 | static const char crlf[] = "\r\n"; | |
84e8cd6d | 1467 | unsigned long brr = __debug_status.brr; |
1da177e4 LT |
1468 | char hx; |
1469 | ||
1470 | ptr = output_buffer; | |
1471 | *ptr++ = 'O'; | |
1472 | ptr = mem2hex(title, ptr, sizeof(title) - 1,0); | |
1473 | ||
1474 | hx = hexchars[(brr & 0xf0000000) >> 28]; | |
1475 | *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf]; | |
1476 | hx = hexchars[(brr & 0x0f000000) >> 24]; | |
1477 | *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf]; | |
1478 | hx = hexchars[(brr & 0x00f00000) >> 20]; | |
1479 | *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf]; | |
1480 | hx = hexchars[(brr & 0x000f0000) >> 16]; | |
1481 | *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf]; | |
1482 | hx = hexchars[(brr & 0x0000f000) >> 12]; | |
1483 | *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf]; | |
1484 | hx = hexchars[(brr & 0x00000f00) >> 8]; | |
1485 | *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf]; | |
1486 | hx = hexchars[(brr & 0x000000f0) >> 4]; | |
1487 | *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf]; | |
1488 | hx = hexchars[(brr & 0x0000000f)]; | |
1489 | *ptr++ = hexchars[hx >> 4]; *ptr++ = hexchars[hx & 0xf]; | |
1490 | ||
1491 | ptr = mem2hex(crlf, ptr, sizeof(crlf) - 1, 0); | |
1492 | *ptr = 0; | |
1493 | gdbstub_send_packet(output_buffer); /* send it off... */ | |
1494 | } | |
1495 | ||
1496 | LEDS(0x5005); | |
1497 | ||
1498 | /* tell the debugger that an exception has occurred */ | |
1499 | ptr = output_buffer; | |
1500 | ||
1501 | /* Send trap type (converted to signal) */ | |
1502 | *ptr++ = 'T'; | |
1503 | *ptr++ = hexchars[sigval >> 4]; | |
1504 | *ptr++ = hexchars[sigval & 0xf]; | |
1505 | ||
1506 | /* Send Error PC */ | |
1507 | *ptr++ = hexchars[GDB_REG_PC >> 4]; | |
1508 | *ptr++ = hexchars[GDB_REG_PC & 0xf]; | |
1509 | *ptr++ = ':'; | |
1510 | ptr = mem2hex(&__debug_frame->pc, ptr, 4, 0); | |
1511 | *ptr++ = ';'; | |
1512 | ||
1513 | /* | |
1514 | * Send frame pointer | |
1515 | */ | |
1516 | *ptr++ = hexchars[GDB_REG_FP >> 4]; | |
1517 | *ptr++ = hexchars[GDB_REG_FP & 0xf]; | |
1518 | *ptr++ = ':'; | |
1519 | ptr = mem2hex(&__debug_frame->fp, ptr, 4, 0); | |
1520 | *ptr++ = ';'; | |
1521 | ||
1522 | /* | |
1523 | * Send stack pointer | |
1524 | */ | |
1525 | *ptr++ = hexchars[GDB_REG_SP >> 4]; | |
1526 | *ptr++ = hexchars[GDB_REG_SP & 0xf]; | |
1527 | *ptr++ = ':'; | |
1528 | ptr = mem2hex(&__debug_frame->sp, ptr, 4, 0); | |
1529 | *ptr++ = ';'; | |
1530 | ||
1531 | *ptr++ = 0; | |
1532 | gdbstub_send_packet(output_buffer); /* send it off... */ | |
1533 | ||
1534 | LEDS(0x5006); | |
1535 | ||
1536 | packet_waiting: | |
1537 | gdbstub_get_mmu_state(); | |
1538 | ||
1539 | /* wait for input from remote GDB */ | |
1540 | while (1) { | |
1541 | output_buffer[0] = 0; | |
1542 | ||
1543 | LEDS(0x5007); | |
1544 | gdbstub_recv_packet(input_buffer); | |
1545 | LEDS(0x5600 | input_buffer[0]); | |
1546 | ||
1547 | switch (input_buffer[0]) { | |
1548 | /* request repeat of last signal number */ | |
1549 | case '?': | |
1550 | output_buffer[0] = 'S'; | |
1551 | output_buffer[1] = hexchars[sigval >> 4]; | |
1552 | output_buffer[2] = hexchars[sigval & 0xf]; | |
1553 | output_buffer[3] = 0; | |
1554 | break; | |
1555 | ||
1556 | case 'd': | |
1557 | /* toggle debug flag */ | |
1558 | break; | |
1559 | ||
1560 | /* return the value of the CPU registers | |
1561 | * - GR0, GR1, GR2, GR3, GR4, GR5, GR6, GR7, | |
1562 | * - GR8, GR9, GR10, GR11, GR12, GR13, GR14, GR15, | |
1563 | * - GR16, GR17, GR18, GR19, GR20, GR21, GR22, GR23, | |
1564 | * - GR24, GR25, GR26, GR27, GR28, GR29, GR30, GR31, | |
1565 | * - GR32, GR33, GR34, GR35, GR36, GR37, GR38, GR39, | |
1566 | * - GR40, GR41, GR42, GR43, GR44, GR45, GR46, GR47, | |
1567 | * - GR48, GR49, GR50, GR51, GR52, GR53, GR54, GR55, | |
1568 | * - GR56, GR57, GR58, GR59, GR60, GR61, GR62, GR63, | |
1569 | * - FP0, FP1, FP2, FP3, FP4, FP5, FP6, FP7, | |
1570 | * - FP8, FP9, FP10, FP11, FP12, FP13, FP14, FP15, | |
1571 | * - FP16, FP17, FP18, FP19, FP20, FP21, FP22, FP23, | |
1572 | * - FP24, FP25, FP26, FP27, FP28, FP29, FP30, FP31, | |
1573 | * - FP32, FP33, FP34, FP35, FP36, FP37, FP38, FP39, | |
1574 | * - FP40, FP41, FP42, FP43, FP44, FP45, FP46, FP47, | |
1575 | * - FP48, FP49, FP50, FP51, FP52, FP53, FP54, FP55, | |
1576 | * - FP56, FP57, FP58, FP59, FP60, FP61, FP62, FP63, | |
1577 | * - PC, PSR, CCR, CCCR, | |
1578 | * - _X132, _X133, _X134 | |
1579 | * - TBR, BRR, DBAR0, DBAR1, DBAR2, DBAR3, | |
1580 | * - _X141, _X142, _X143, _X144, | |
1581 | * - LR, LCR | |
1582 | */ | |
1583 | case 'g': | |
1584 | zero = 0; | |
1585 | ptr = output_buffer; | |
1586 | ||
1587 | /* deal with GR0, GR1-GR27, GR28-GR31, GR32-GR63 */ | |
1588 | ptr = mem2hex(&zero, ptr, 4, 0); | |
1589 | ||
1590 | for (loop = 1; loop <= 27; loop++) | |
84e8cd6d | 1591 | ptr = mem2hex(&__debug_user_context->i.gr[loop], ptr, 4, 0); |
1da177e4 LT |
1592 | temp = (unsigned long) __frame; |
1593 | ptr = mem2hex(&temp, ptr, 4, 0); | |
84e8cd6d DH |
1594 | ptr = mem2hex(&__debug_user_context->i.gr[29], ptr, 4, 0); |
1595 | ptr = mem2hex(&__debug_user_context->i.gr[30], ptr, 4, 0); | |
1da177e4 | 1596 | #ifdef CONFIG_MMU |
84e8cd6d | 1597 | ptr = mem2hex(&__debug_user_context->i.gr[31], ptr, 4, 0); |
1da177e4 LT |
1598 | #else |
1599 | temp = (unsigned long) __debug_frame; | |
1600 | ptr = mem2hex(&temp, ptr, 4, 0); | |
1601 | #endif | |
1602 | ||
1603 | for (loop = 32; loop <= 63; loop++) | |
84e8cd6d | 1604 | ptr = mem2hex(&__debug_user_context->i.gr[loop], ptr, 4, 0); |
1da177e4 LT |
1605 | |
1606 | /* deal with FR0-FR63 */ | |
1607 | for (loop = 0; loop <= 63; loop++) | |
84e8cd6d | 1608 | ptr = mem2hex(&__debug_user_context->f.fr[loop], ptr, 4, 0); |
1da177e4 LT |
1609 | |
1610 | /* deal with special registers */ | |
1611 | ptr = mem2hex(&__debug_frame->pc, ptr, 4, 0); | |
1612 | ptr = mem2hex(&__debug_frame->psr, ptr, 4, 0); | |
1613 | ptr = mem2hex(&__debug_frame->ccr, ptr, 4, 0); | |
1614 | ptr = mem2hex(&__debug_frame->cccr, ptr, 4, 0); | |
1615 | ptr = mem2hex(&zero, ptr, 4, 0); | |
1616 | ptr = mem2hex(&zero, ptr, 4, 0); | |
1617 | ptr = mem2hex(&zero, ptr, 4, 0); | |
1618 | ptr = mem2hex(&__debug_frame->tbr, ptr, 4, 0); | |
84e8cd6d | 1619 | ptr = mem2hex(&__debug_status.brr , ptr, 4, 0); |
1da177e4 LT |
1620 | |
1621 | asm volatile("movsg dbar0,%0" : "=r"(dbar)); | |
1622 | ptr = mem2hex(&dbar, ptr, 4, 0); | |
1623 | asm volatile("movsg dbar1,%0" : "=r"(dbar)); | |
1624 | ptr = mem2hex(&dbar, ptr, 4, 0); | |
1625 | asm volatile("movsg dbar2,%0" : "=r"(dbar)); | |
1626 | ptr = mem2hex(&dbar, ptr, 4, 0); | |
1627 | asm volatile("movsg dbar3,%0" : "=r"(dbar)); | |
1628 | ptr = mem2hex(&dbar, ptr, 4, 0); | |
1629 | ||
1630 | asm volatile("movsg scr0,%0" : "=r"(dbar)); | |
1631 | ptr = mem2hex(&dbar, ptr, 4, 0); | |
1632 | asm volatile("movsg scr1,%0" : "=r"(dbar)); | |
1633 | ptr = mem2hex(&dbar, ptr, 4, 0); | |
1634 | asm volatile("movsg scr2,%0" : "=r"(dbar)); | |
1635 | ptr = mem2hex(&dbar, ptr, 4, 0); | |
1636 | asm volatile("movsg scr3,%0" : "=r"(dbar)); | |
1637 | ptr = mem2hex(&dbar, ptr, 4, 0); | |
1638 | ||
1639 | ptr = mem2hex(&__debug_frame->lr, ptr, 4, 0); | |
1640 | ptr = mem2hex(&__debug_frame->lcr, ptr, 4, 0); | |
1641 | ||
1642 | ptr = mem2hex(&__debug_frame->iacc0, ptr, 8, 0); | |
1643 | ||
84e8cd6d | 1644 | ptr = mem2hex(&__debug_user_context->f.fsr[0], ptr, 4, 0); |
1da177e4 LT |
1645 | |
1646 | for (loop = 0; loop <= 7; loop++) | |
84e8cd6d | 1647 | ptr = mem2hex(&__debug_user_context->f.acc[loop], ptr, 4, 0); |
1da177e4 | 1648 | |
84e8cd6d | 1649 | ptr = mem2hex(&__debug_user_context->f.accg, ptr, 8, 0); |
1da177e4 LT |
1650 | |
1651 | for (loop = 0; loop <= 1; loop++) | |
84e8cd6d | 1652 | ptr = mem2hex(&__debug_user_context->f.msr[loop], ptr, 4, 0); |
1da177e4 LT |
1653 | |
1654 | ptr = mem2hex(&__debug_frame->gner0, ptr, 4, 0); | |
1655 | ptr = mem2hex(&__debug_frame->gner1, ptr, 4, 0); | |
1656 | ||
84e8cd6d DH |
1657 | ptr = mem2hex(&__debug_user_context->f.fner[0], ptr, 4, 0); |
1658 | ptr = mem2hex(&__debug_user_context->f.fner[1], ptr, 4, 0); | |
1da177e4 LT |
1659 | |
1660 | break; | |
1661 | ||
1662 | /* set the values of the CPU registers */ | |
1663 | case 'G': | |
1664 | ptr = &input_buffer[1]; | |
1665 | ||
1666 | /* deal with GR0, GR1-GR27, GR28-GR31, GR32-GR63 */ | |
1667 | ptr = hex2mem(ptr, &temp, 4); | |
1668 | ||
1669 | for (loop = 1; loop <= 27; loop++) | |
84e8cd6d | 1670 | ptr = hex2mem(ptr, &__debug_user_context->i.gr[loop], 4); |
1da177e4 LT |
1671 | |
1672 | ptr = hex2mem(ptr, &temp, 4); | |
1673 | __frame = (struct pt_regs *) temp; | |
1674 | ptr = hex2mem(ptr, &__debug_frame->gr29, 4); | |
1675 | ptr = hex2mem(ptr, &__debug_frame->gr30, 4); | |
1676 | #ifdef CONFIG_MMU | |
1677 | ptr = hex2mem(ptr, &__debug_frame->gr31, 4); | |
1678 | #else | |
1679 | ptr = hex2mem(ptr, &temp, 4); | |
1680 | #endif | |
1681 | ||
1682 | for (loop = 32; loop <= 63; loop++) | |
84e8cd6d | 1683 | ptr = hex2mem(ptr, &__debug_user_context->i.gr[loop], 4); |
1da177e4 LT |
1684 | |
1685 | /* deal with FR0-FR63 */ | |
1686 | for (loop = 0; loop <= 63; loop++) | |
84e8cd6d | 1687 | ptr = mem2hex(&__debug_user_context->f.fr[loop], ptr, 4, 0); |
1da177e4 LT |
1688 | |
1689 | /* deal with special registers */ | |
1690 | ptr = hex2mem(ptr, &__debug_frame->pc, 4); | |
1691 | ptr = hex2mem(ptr, &__debug_frame->psr, 4); | |
1692 | ptr = hex2mem(ptr, &__debug_frame->ccr, 4); | |
1693 | ptr = hex2mem(ptr, &__debug_frame->cccr,4); | |
1694 | ||
1695 | for (loop = 132; loop <= 140; loop++) | |
1696 | ptr = hex2mem(ptr, &temp, 4); | |
1697 | ||
1698 | ptr = hex2mem(ptr, &temp, 4); | |
1699 | asm volatile("movgs %0,scr0" :: "r"(temp)); | |
1700 | ptr = hex2mem(ptr, &temp, 4); | |
1701 | asm volatile("movgs %0,scr1" :: "r"(temp)); | |
1702 | ptr = hex2mem(ptr, &temp, 4); | |
1703 | asm volatile("movgs %0,scr2" :: "r"(temp)); | |
1704 | ptr = hex2mem(ptr, &temp, 4); | |
1705 | asm volatile("movgs %0,scr3" :: "r"(temp)); | |
1706 | ||
1707 | ptr = hex2mem(ptr, &__debug_frame->lr, 4); | |
1708 | ptr = hex2mem(ptr, &__debug_frame->lcr, 4); | |
1709 | ||
1710 | ptr = hex2mem(ptr, &__debug_frame->iacc0, 8); | |
1711 | ||
84e8cd6d | 1712 | ptr = hex2mem(ptr, &__debug_user_context->f.fsr[0], 4); |
1da177e4 LT |
1713 | |
1714 | for (loop = 0; loop <= 7; loop++) | |
84e8cd6d | 1715 | ptr = hex2mem(ptr, &__debug_user_context->f.acc[loop], 4); |
1da177e4 | 1716 | |
84e8cd6d | 1717 | ptr = hex2mem(ptr, &__debug_user_context->f.accg, 8); |
1da177e4 LT |
1718 | |
1719 | for (loop = 0; loop <= 1; loop++) | |
84e8cd6d | 1720 | ptr = hex2mem(ptr, &__debug_user_context->f.msr[loop], 4); |
1da177e4 LT |
1721 | |
1722 | ptr = hex2mem(ptr, &__debug_frame->gner0, 4); | |
1723 | ptr = hex2mem(ptr, &__debug_frame->gner1, 4); | |
1724 | ||
84e8cd6d DH |
1725 | ptr = hex2mem(ptr, &__debug_user_context->f.fner[0], 4); |
1726 | ptr = hex2mem(ptr, &__debug_user_context->f.fner[1], 4); | |
1da177e4 LT |
1727 | |
1728 | gdbstub_strcpy(output_buffer,"OK"); | |
1729 | break; | |
1730 | ||
1731 | /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */ | |
1732 | case 'm': | |
1733 | ptr = &input_buffer[1]; | |
1734 | ||
1735 | if (hexToInt(&ptr, &addr) && | |
1736 | *ptr++ == ',' && | |
1737 | hexToInt(&ptr, &length) | |
1738 | ) { | |
1739 | if (mem2hex((char *)addr, output_buffer, length, 1)) | |
1740 | break; | |
1741 | gdbstub_strcpy (output_buffer, "E03"); | |
1742 | } | |
1743 | else { | |
1744 | gdbstub_strcpy(output_buffer,"E01"); | |
1745 | } | |
1746 | break; | |
1747 | ||
1748 | /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */ | |
1749 | case 'M': | |
1750 | ptr = &input_buffer[1]; | |
1751 | ||
1752 | if (hexToInt(&ptr, &addr) && | |
1753 | *ptr++ == ',' && | |
1754 | hexToInt(&ptr, &length) && | |
1755 | *ptr++ == ':' | |
1756 | ) { | |
1757 | if (hex2mem(ptr, (char *)addr, length)) { | |
1758 | gdbstub_strcpy(output_buffer, "OK"); | |
1759 | } | |
1760 | else { | |
1761 | gdbstub_strcpy(output_buffer, "E03"); | |
1762 | } | |
1763 | } | |
1764 | else | |
1765 | gdbstub_strcpy(output_buffer, "E02"); | |
1766 | ||
1767 | flush_cache = 1; | |
1768 | break; | |
1769 | ||
1770 | /* PNN,=RRRRRRRR: Write value R to reg N return OK */ | |
1771 | case 'P': | |
1772 | ptr = &input_buffer[1]; | |
1773 | ||
1774 | if (!hexToInt(&ptr, &addr) || | |
1775 | *ptr++ != '=' || | |
1776 | !hexToInt(&ptr, &temp) | |
1777 | ) { | |
1778 | gdbstub_strcpy(output_buffer, "E01"); | |
1779 | break; | |
1780 | } | |
1781 | ||
1782 | temp2 = 1; | |
1783 | switch (addr) { | |
1784 | case GDB_REG_GR(0): | |
1785 | break; | |
1786 | case GDB_REG_GR(1) ... GDB_REG_GR(63): | |
84e8cd6d | 1787 | __debug_user_context->i.gr[addr - GDB_REG_GR(0)] = temp; |
1da177e4 LT |
1788 | break; |
1789 | case GDB_REG_FR(0) ... GDB_REG_FR(63): | |
84e8cd6d | 1790 | __debug_user_context->f.fr[addr - GDB_REG_FR(0)] = temp; |
1da177e4 LT |
1791 | break; |
1792 | case GDB_REG_PC: | |
84e8cd6d | 1793 | __debug_user_context->i.pc = temp; |
1da177e4 LT |
1794 | break; |
1795 | case GDB_REG_PSR: | |
84e8cd6d | 1796 | __debug_user_context->i.psr = temp; |
1da177e4 LT |
1797 | break; |
1798 | case GDB_REG_CCR: | |
84e8cd6d | 1799 | __debug_user_context->i.ccr = temp; |
1da177e4 LT |
1800 | break; |
1801 | case GDB_REG_CCCR: | |
84e8cd6d | 1802 | __debug_user_context->i.cccr = temp; |
1da177e4 LT |
1803 | break; |
1804 | case GDB_REG_BRR: | |
84e8cd6d | 1805 | __debug_status.brr = temp; |
1da177e4 LT |
1806 | break; |
1807 | case GDB_REG_LR: | |
84e8cd6d | 1808 | __debug_user_context->i.lr = temp; |
1da177e4 LT |
1809 | break; |
1810 | case GDB_REG_LCR: | |
84e8cd6d | 1811 | __debug_user_context->i.lcr = temp; |
1da177e4 LT |
1812 | break; |
1813 | case GDB_REG_FSR0: | |
84e8cd6d | 1814 | __debug_user_context->f.fsr[0] = temp; |
1da177e4 LT |
1815 | break; |
1816 | case GDB_REG_ACC(0) ... GDB_REG_ACC(7): | |
84e8cd6d | 1817 | __debug_user_context->f.acc[addr - GDB_REG_ACC(0)] = temp; |
1da177e4 LT |
1818 | break; |
1819 | case GDB_REG_ACCG(0): | |
84e8cd6d | 1820 | *(uint32_t *) &__debug_user_context->f.accg[0] = temp; |
1da177e4 LT |
1821 | break; |
1822 | case GDB_REG_ACCG(4): | |
84e8cd6d | 1823 | *(uint32_t *) &__debug_user_context->f.accg[4] = temp; |
1da177e4 LT |
1824 | break; |
1825 | case GDB_REG_MSR(0) ... GDB_REG_MSR(1): | |
84e8cd6d | 1826 | __debug_user_context->f.msr[addr - GDB_REG_MSR(0)] = temp; |
1da177e4 LT |
1827 | break; |
1828 | case GDB_REG_GNER(0) ... GDB_REG_GNER(1): | |
84e8cd6d | 1829 | __debug_user_context->i.gner[addr - GDB_REG_GNER(0)] = temp; |
1da177e4 LT |
1830 | break; |
1831 | case GDB_REG_FNER(0) ... GDB_REG_FNER(1): | |
84e8cd6d | 1832 | __debug_user_context->f.fner[addr - GDB_REG_FNER(0)] = temp; |
1da177e4 LT |
1833 | break; |
1834 | default: | |
1835 | temp2 = 0; | |
1836 | break; | |
1837 | } | |
1838 | ||
1839 | if (temp2) { | |
1840 | gdbstub_strcpy(output_buffer, "OK"); | |
1841 | } | |
1842 | else { | |
1843 | gdbstub_strcpy(output_buffer, "E02"); | |
1844 | } | |
1845 | break; | |
1846 | ||
1847 | /* cAA..AA Continue at address AA..AA(optional) */ | |
1848 | case 'c': | |
1849 | /* try to read optional parameter, pc unchanged if no parm */ | |
1850 | ptr = &input_buffer[1]; | |
1851 | if (hexToInt(&ptr, &addr)) | |
1852 | __debug_frame->pc = addr; | |
1853 | goto done; | |
1854 | ||
1855 | /* kill the program */ | |
1856 | case 'k' : | |
1857 | goto done; /* just continue */ | |
1858 | ||
1859 | ||
1860 | /* reset the whole machine (FIXME: system dependent) */ | |
1861 | case 'r': | |
1862 | break; | |
1863 | ||
1864 | ||
1865 | /* step to next instruction */ | |
1866 | case 's': | |
1867 | __debug_regs->dcr |= DCR_SE; | |
84e8cd6d | 1868 | __debug_status.dcr |= DCR_SE; |
1da177e4 LT |
1869 | goto done; |
1870 | ||
1871 | /* set baud rate (bBB) */ | |
1872 | case 'b': | |
1873 | ptr = &input_buffer[1]; | |
1874 | if (!hexToInt(&ptr, &temp)) { | |
1875 | gdbstub_strcpy(output_buffer,"B01"); | |
1876 | break; | |
1877 | } | |
1878 | ||
1879 | if (temp) { | |
1880 | /* ack before changing speed */ | |
1881 | gdbstub_send_packet("OK"); | |
1882 | gdbstub_set_baud(temp); | |
1883 | } | |
1884 | break; | |
1885 | ||
1886 | /* set breakpoint */ | |
1887 | case 'Z': | |
1888 | ptr = &input_buffer[1]; | |
1889 | ||
1890 | if (!hexToInt(&ptr,&temp) || *ptr++ != ',' || | |
1891 | !hexToInt(&ptr,&addr) || *ptr++ != ',' || | |
1892 | !hexToInt(&ptr,&length) | |
1893 | ) { | |
1894 | gdbstub_strcpy(output_buffer,"E01"); | |
1895 | break; | |
1896 | } | |
1897 | ||
1898 | if (temp >= 5) { | |
1899 | gdbstub_strcpy(output_buffer,"E03"); | |
1900 | break; | |
1901 | } | |
1902 | ||
1903 | if (gdbstub_set_breakpoint(temp, addr, length) < 0) { | |
1904 | gdbstub_strcpy(output_buffer,"E03"); | |
1905 | break; | |
1906 | } | |
1907 | ||
1908 | if (temp == 0) | |
1909 | flush_cache = 1; /* soft bkpt by modified memory */ | |
1910 | ||
1911 | gdbstub_strcpy(output_buffer,"OK"); | |
1912 | break; | |
1913 | ||
1914 | /* clear breakpoint */ | |
1915 | case 'z': | |
1916 | ptr = &input_buffer[1]; | |
1917 | ||
1918 | if (!hexToInt(&ptr,&temp) || *ptr++ != ',' || | |
1919 | !hexToInt(&ptr,&addr) || *ptr++ != ',' || | |
1920 | !hexToInt(&ptr,&length) | |
1921 | ) { | |
1922 | gdbstub_strcpy(output_buffer,"E01"); | |
1923 | break; | |
1924 | } | |
1925 | ||
1926 | if (temp >= 5) { | |
1927 | gdbstub_strcpy(output_buffer,"E03"); | |
1928 | break; | |
1929 | } | |
1930 | ||
1931 | if (gdbstub_clear_breakpoint(temp, addr, length) < 0) { | |
1932 | gdbstub_strcpy(output_buffer,"E03"); | |
1933 | break; | |
1934 | } | |
1935 | ||
1936 | if (temp == 0) | |
1937 | flush_cache = 1; /* soft bkpt by modified memory */ | |
1938 | ||
1939 | gdbstub_strcpy(output_buffer,"OK"); | |
1940 | break; | |
1941 | ||
1942 | default: | |
1943 | gdbstub_proto("### GDB Unsupported Cmd '%s'\n",input_buffer); | |
1944 | break; | |
1945 | } | |
1946 | ||
1947 | /* reply to the request */ | |
1948 | LEDS(0x5009); | |
1949 | gdbstub_send_packet(output_buffer); | |
1950 | } | |
1951 | ||
1952 | done: | |
84e8cd6d | 1953 | restore_user_regs(&__debug_frame0->uc); |
1da177e4 LT |
1954 | |
1955 | //gdbstub_dump_debugregs(); | |
1956 | //gdbstub_printk("<-- gdbstub() %08x\n", __debug_frame->pc); | |
1957 | ||
1958 | /* need to flush the instruction cache before resuming, as we may have | |
1959 | * deposited a breakpoint, and the icache probably has no way of | |
1960 | * knowing that a data ref to some location may have changed something | |
1961 | * that is in the instruction cache. NB: We flush both caches, just to | |
1962 | * be sure... | |
1963 | */ | |
1964 | ||
1965 | /* note: flushing the icache will clobber EAR0 on the FR451 */ | |
1966 | if (flush_cache) | |
1967 | gdbstub_purge_cache(); | |
1968 | ||
1969 | LEDS(0x5666); | |
1970 | ||
1971 | } /* end gdbstub() */ | |
1972 | ||
1973 | /*****************************************************************************/ | |
1974 | /* | |
1975 | * initialise the GDB stub | |
1976 | */ | |
1977 | void __init gdbstub_init(void) | |
1978 | { | |
1979 | #ifdef CONFIG_GDBSTUB_IMMEDIATE | |
1980 | unsigned char ch; | |
1981 | int ret; | |
1982 | #endif | |
1983 | ||
1984 | gdbstub_printk("%s", gdbstub_banner); | |
1da177e4 LT |
1985 | |
1986 | gdbstub_io_init(); | |
1987 | ||
1988 | /* try to talk to GDB (or anyone insane enough to want to type GDB protocol by hand) */ | |
1989 | gdbstub_proto("### GDB Tx ACK\n"); | |
1990 | gdbstub_tx_char('+'); /* 'hello world' */ | |
1991 | ||
1992 | #ifdef CONFIG_GDBSTUB_IMMEDIATE | |
1993 | gdbstub_printk("GDB Stub waiting for packet\n"); | |
1994 | ||
1995 | /* | |
1996 | * In case GDB is started before us, ack any packets | |
1997 | * (presumably "$?#xx") sitting there. | |
1998 | */ | |
1999 | do { gdbstub_rx_char(&ch, 0); } while (ch != '$'); | |
2000 | do { gdbstub_rx_char(&ch, 0); } while (ch != '#'); | |
2001 | do { ret = gdbstub_rx_char(&ch, 0); } while (ret != 0); /* eat first csum byte */ | |
2002 | do { ret = gdbstub_rx_char(&ch, 0); } while (ret != 0); /* eat second csum byte */ | |
2003 | ||
2004 | gdbstub_proto("### GDB Tx NAK\n"); | |
2005 | gdbstub_tx_char('-'); /* nak it */ | |
2006 | ||
2007 | #else | |
2008 | gdbstub_printk("GDB Stub set\n"); | |
2009 | #endif | |
2010 | ||
2011 | #if 0 | |
2012 | /* send banner */ | |
2013 | ptr = output_buffer; | |
2014 | *ptr++ = 'O'; | |
2015 | ptr = mem2hex(gdbstub_banner, ptr, sizeof(gdbstub_banner) - 1, 0); | |
2016 | gdbstub_send_packet(output_buffer); | |
2017 | #endif | |
76925916 | 2018 | #if defined(CONFIG_GDB_CONSOLE) && defined(CONFIG_GDBSTUB_IMMEDIATE) |
1da177e4 LT |
2019 | register_console(&gdbstub_console); |
2020 | #endif | |
2021 | ||
2022 | } /* end gdbstub_init() */ | |
2023 | ||
2024 | /*****************************************************************************/ | |
2025 | /* | |
2026 | * register the console at a more appropriate time | |
2027 | */ | |
76925916 | 2028 | #if defined (CONFIG_GDB_CONSOLE) && !defined(CONFIG_GDBSTUB_IMMEDIATE) |
1da177e4 LT |
2029 | static int __init gdbstub_postinit(void) |
2030 | { | |
2031 | printk("registering console\n"); | |
2032 | register_console(&gdbstub_console); | |
2033 | return 0; | |
2034 | } /* end gdbstub_postinit() */ | |
2035 | ||
2036 | __initcall(gdbstub_postinit); | |
2037 | #endif | |
2038 | ||
2039 | /*****************************************************************************/ | |
2040 | /* | |
2041 | * send an exit message to GDB | |
2042 | */ | |
2043 | void gdbstub_exit(int status) | |
2044 | { | |
2045 | unsigned char checksum; | |
2046 | int count; | |
2047 | unsigned char ch; | |
2048 | ||
2049 | sprintf(output_buffer,"W%02x",status&0xff); | |
2050 | ||
2051 | gdbstub_tx_char('$'); | |
2052 | checksum = 0; | |
2053 | count = 0; | |
2054 | ||
2055 | while ((ch = output_buffer[count]) != 0) { | |
2056 | gdbstub_tx_char(ch); | |
2057 | checksum += ch; | |
2058 | count += 1; | |
2059 | } | |
2060 | ||
2061 | gdbstub_tx_char('#'); | |
2062 | gdbstub_tx_char(hexchars[checksum >> 4]); | |
2063 | gdbstub_tx_char(hexchars[checksum & 0xf]); | |
2064 | ||
2065 | /* make sure the output is flushed, or else RedBoot might clobber it */ | |
2066 | gdbstub_tx_char('-'); | |
2067 | gdbstub_tx_flush(); | |
2068 | ||
2069 | } /* end gdbstub_exit() */ | |
2070 | ||
2071 | /*****************************************************************************/ | |
2072 | /* | |
2073 | * GDB wants to call malloc() and free() to allocate memory for calling kernel | |
2074 | * functions directly from its command line | |
2075 | */ | |
0a9d6e7c | 2076 | static void *malloc(size_t size) __maybe_unused; |
1da177e4 LT |
2077 | static void *malloc(size_t size) |
2078 | { | |
2079 | return kmalloc(size, GFP_ATOMIC); | |
2080 | } | |
2081 | ||
0a9d6e7c | 2082 | static void free(void *p) __maybe_unused; |
1da177e4 LT |
2083 | static void free(void *p) |
2084 | { | |
2085 | kfree(p); | |
2086 | } | |
2087 | ||
0a9d6e7c | 2088 | static uint32_t ___get_HSR0(void) __maybe_unused; |
1da177e4 LT |
2089 | static uint32_t ___get_HSR0(void) |
2090 | { | |
2091 | return __get_HSR(0); | |
2092 | } | |
2093 | ||
0a9d6e7c | 2094 | static uint32_t ___set_HSR0(uint32_t x) __maybe_unused; |
1da177e4 LT |
2095 | static uint32_t ___set_HSR0(uint32_t x) |
2096 | { | |
2097 | __set_HSR(0, x); | |
2098 | return __get_HSR(0); | |
2099 | } |