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Merge branch 'irq-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / mn10300 / kernel / gdb-stub.c
CommitLineData
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>
2f2a2132
DH		 139#include <unit/leds.h>
140#include <unit/serial.h>
b920de1b
DH		 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
151static const char gdbstub_banner[] =
152 "Linux/MN10300 GDB Stub (c) RedHat 2007\n";
153
154u8 gdbstub_rx_buffer[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
155u32 gdbstub_rx_inp;
156u32 gdbstub_rx_outp;
157u8 gdbstub_busy;
158u8 gdbstub_rx_overflow;
159u8 gdbstub_rx_unget;
160
161static u8 gdbstub_flush_caches;
162static char input_buffer[BUFMAX];
163static char output_buffer[BUFMAX];
164static char trans_buffer[BUFMAX];
165
b920de1b
DH		 166struct gdbstub_bkpt {
167 u8 *addr; /* address of breakpoint */
168 u8 len; /* size of breakpoint */
169 u8 origbytes[7]; /* original bytes */
170};
171
172static struct gdbstub_bkpt gdbstub_bkpts[256];
173
174/*
175 * local prototypes
176 */
177static void getpacket(char *buffer);
178static int putpacket(char *buffer);
179static int computeSignal(enum exception_code excep);
180static int hex(unsigned char ch);
181static int hexToInt(char **ptr, int *intValue);
182static unsigned char *mem2hex(const void *mem, char *buf, int count,
183 int may_fault);
184static 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 */
190static 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
203void debug_to_serial(const char *p, int n)
204{
205 __debug_to_serial(p, n);
206 /* gdbstub_console_write(NULL, p, n); */
207}
208
209void 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
223static 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 $<data>#<checksum>
233 */
234static void getpacket(char *buffer)
235{
236 unsigned char checksum;
237 unsigned char xmitcsum;
238 unsigned char ch;
239 int count, i, ret, error;
240
241 for (;;) {
242 /*
243 * wait around for the start character,
244 * ignore all other characters
245 */
246 do {
247 gdbstub_io_rx_char(&ch, 0);
248 } while (ch != '$');
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 */
341static 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 */
387static 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 */
415static struct gdb_bp_save {
416 u8 *addr;
417 u8 opcode[2];
418} step_bp[2];
419
420static 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
441static int __gdbstub_mark_bp(u8 *addr, int ix)
442{
368dd5ac
AT		 443 /* vmalloc area */
444 if (((u8 *) VMALLOC_START <= addr) && (addr < (u8 *) VMALLOC_END))
b920de1b 445 goto okay;
368dd5ac
AT		 446 /* SRAM, SDRAM */
447 if (((u8 *) 0x80000000UL <= addr) && (addr < (u8 *) 0xa0000000UL))
b920de1b
DH		 448 goto okay;
449 return 0;
450
451okay:
452 if (gdbstub_read_byte(addr + 0, &step_bp[ix].opcode[0]) < 0 ||
453 gdbstub_read_byte(addr + 1, &step_bp[ix].opcode[1]) < 0)
454 return 0;
455
456 step_bp[ix].addr = addr;
457 return 1;
458}
459
460static inline void __gdbstub_restore_bp(void)
461{
462#ifdef GDBSTUB_USE_F7F7_AS_BREAKPOINT
463 if (step_bp[0].addr) {
464 gdbstub_write_byte(step_bp[0].opcode[0], step_bp[0].addr + 0);
465 gdbstub_write_byte(step_bp[0].opcode[1], step_bp[0].addr + 1);
466 }
467 if (step_bp[1].addr) {
468 gdbstub_write_byte(step_bp[1].opcode[0], step_bp[1].addr + 0);
469 gdbstub_write_byte(step_bp[1].opcode[1], step_bp[1].addr + 1);
470 }
471#else
472 if (step_bp[0].addr)
473 gdbstub_write_byte(step_bp[0].opcode[0], step_bp[0].addr + 0);
474 if (step_bp[1].addr)
475 gdbstub_write_byte(step_bp[1].opcode[0], step_bp[1].addr + 0);
476#endif
477
478 gdbstub_flush_caches = 1;
479
480 step_bp[0].addr = NULL;
481 step_bp[0].opcode[0] = 0;
482 step_bp[0].opcode[1] = 0;
483 step_bp[1].addr = NULL;
484 step_bp[1].opcode[0] = 0;
485 step_bp[1].opcode[1] = 0;
486}
487
488/*
489 * emulate single stepping by means of breakpoint instructions
490 */
491static int gdbstub_single_step(struct pt_regs *regs)
492{
493 unsigned size;
494 uint32_t x;
495 uint8_t cur, *pc, *sp;
496
497 step_bp[0].addr = NULL;
498 step_bp[0].opcode[0] = 0;
499 step_bp[0].opcode[1] = 0;
500 step_bp[1].addr = NULL;
501 step_bp[1].opcode[0] = 0;
502 step_bp[1].opcode[1] = 0;
503 x = 0;
504
505 pc = (u8 *) regs->pc;
506 sp = (u8 *) (regs + 1);
507 if (gdbstub_read_byte(pc, &cur) < 0)
508 return -EFAULT;
509
510 gdbstub_bkpt("Single Step from %p { %02x }\n", pc, cur);
511
512 gdbstub_flush_caches = 1;
513
514 size = gdbstub_insn_sizes[cur];
515 if (size > 0) {
516 if (!__gdbstub_mark_bp(pc + size, 0))
517 goto fault;
518 } else {
519 switch (cur) {
520 /* Bxx (d8,PC) */
499c59c4 521 case 0xc0 ... 0xca:
b920de1b
DH		 522 if (gdbstub_read_byte(pc + 1, (u8 *) &x) < 0)
523 goto fault;
524 if (!__gdbstub_mark_bp(pc + 2, 0))
525 goto fault;
526 if ((x < 0 || x > 2) &&
527 !__gdbstub_mark_bp(pc + (s8) x, 1))
528 goto fault;
529 break;
530
531 /* LXX (d8,PC) */
499c59c4 532 case 0xd0 ... 0xda:
b920de1b
DH		 533 if (!__gdbstub_mark_bp(pc + 1, 0))
534 goto fault;
535 if (regs->pc != regs->lar &&
536 !__gdbstub_mark_bp((u8 *) regs->lar, 1))
537 goto fault;
538 break;
539
540 /* SETLB - loads the next for bytes into the LIR
541 * register */
542 case 0xdb:
543 if (!__gdbstub_mark_bp(pc + 1, 0))
544 goto fault;
545 break;
546
547 /* JMP (d16,PC) or CALL (d16,PC) */
548 case 0xcc:
549 case 0xcd:
550 if (gdbstub_read_byte(pc + 1, ((u8 *) &x) + 0) < 0 ||
551 gdbstub_read_byte(pc + 2, ((u8 *) &x) + 1) < 0)
552 goto fault;
553 if (!__gdbstub_mark_bp(pc + (s16) x, 0))
554 goto fault;
555 break;
556
557 /* JMP (d32,PC) or CALL (d32,PC) */
558 case 0xdc:
559 case 0xdd:
560 if (gdbstub_read_byte(pc + 1, ((u8 *) &x) + 0) < 0 ||
561 gdbstub_read_byte(pc + 2, ((u8 *) &x) + 1) < 0 ||
562 gdbstub_read_byte(pc + 3, ((u8 *) &x) + 2) < 0 ||
563 gdbstub_read_byte(pc + 4, ((u8 *) &x) + 3) < 0)
564 goto fault;
565 if (!__gdbstub_mark_bp(pc + (s32) x, 0))
566 goto fault;
567 break;
568
569 /* RETF */
570 case 0xde:
571 if (!__gdbstub_mark_bp((u8 *) regs->mdr, 0))
572 goto fault;
573 break;
574
575 /* RET */
576 case 0xdf:
577 if (gdbstub_read_byte(pc + 2, (u8 *) &x) < 0)
578 goto fault;
579 sp += (s8)x;
580 if (gdbstub_read_byte(sp + 0, ((u8 *) &x) + 0) < 0 ||
581 gdbstub_read_byte(sp + 1, ((u8 *) &x) + 1) < 0 ||
582 gdbstub_read_byte(sp + 2, ((u8 *) &x) + 2) < 0 ||
583 gdbstub_read_byte(sp + 3, ((u8 *) &x) + 3) < 0)
584 goto fault;
585 if (!__gdbstub_mark_bp((u8 *) x, 0))
586 goto fault;
587 break;
588
589 case 0xf0:
590 if (gdbstub_read_byte(pc + 1, &cur) < 0)
591 goto fault;
592
593 if (cur >= 0xf0 && cur <= 0xf7) {
594 /* JMP (An) / CALLS (An) */
595 switch (cur & 3) {
596 case 0: x = regs->a0; break;
597 case 1: x = regs->a1; break;
598 case 2: x = regs->a2; break;
599 case 3: x = regs->a3; break;
600 }
601 if (!__gdbstub_mark_bp((u8 *) x, 0))
602 goto fault;
603 } else if (cur == 0xfc) {
604 /* RETS */
605 if (gdbstub_read_byte(
606 sp + 0, ((u8 *) &x) + 0) < 0 ||
607 gdbstub_read_byte(
608 sp + 1, ((u8 *) &x) + 1) < 0 ||
609 gdbstub_read_byte(
610 sp + 2, ((u8 *) &x) + 2) < 0 ||
611 gdbstub_read_byte(
612 sp + 3, ((u8 *) &x) + 3) < 0)
613 goto fault;
614 if (!__gdbstub_mark_bp((u8 *) x, 0))
615 goto fault;
616 } else if (cur == 0xfd) {
617 /* RTI */
618 if (gdbstub_read_byte(
619 sp + 4, ((u8 *) &x) + 0) < 0 ||
620 gdbstub_read_byte(
621 sp + 5, ((u8 *) &x) + 1) < 0 ||
622 gdbstub_read_byte(
623 sp + 6, ((u8 *) &x) + 2) < 0 ||
624 gdbstub_read_byte(
625 sp + 7, ((u8 *) &x) + 3) < 0)
626 goto fault;
627 if (!__gdbstub_mark_bp((u8 *) x, 0))
628 goto fault;
629 } else {
630 if (!__gdbstub_mark_bp(pc + 2, 0))
631 goto fault;
632 }
633
634 break;
635
636 /* potential 3-byte conditional branches */
637 case 0xf8:
638 if (gdbstub_read_byte(pc + 1, &cur) < 0)
639 goto fault;
640 if (!__gdbstub_mark_bp(pc + 3, 0))
641 goto fault;
642
643 if (cur >= 0xe8 && cur <= 0xeb) {
644 if (gdbstub_read_byte(
645 pc + 2, ((u8 *) &x) + 0) < 0)
646 goto fault;
647 if ((x < 0 || x > 3) &&
648 !__gdbstub_mark_bp(pc + (s8) x, 1))
649 goto fault;
650 }
651 break;
652
653 case 0xfa:
654 if (gdbstub_read_byte(pc + 1, &cur) < 0)
655 goto fault;
656
657 if (cur == 0xff) {
658 /* CALLS (d16,PC) */
659 if (gdbstub_read_byte(
660 pc + 2, ((u8 *) &x) + 0) < 0 ||
661 gdbstub_read_byte(
662 pc + 3, ((u8 *) &x) + 1) < 0)
663 goto fault;
664 if (!__gdbstub_mark_bp(pc + (s16) x, 0))
665 goto fault;
666 } else {
667 if (!__gdbstub_mark_bp(pc + 4, 0))
668 goto fault;
669 }
670 break;
671
672 case 0xfc:
673 if (gdbstub_read_byte(pc + 1, &cur) < 0)
674 goto fault;
675 if (cur == 0xff) {
676 /* CALLS (d32,PC) */
677 if (gdbstub_read_byte(
678 pc + 2, ((u8 *) &x) + 0) < 0 ||
679 gdbstub_read_byte(
680 pc + 3, ((u8 *) &x) + 1) < 0 ||
681 gdbstub_read_byte(
682 pc + 4, ((u8 *) &x) + 2) < 0 ||
683 gdbstub_read_byte(
684 pc + 5, ((u8 *) &x) + 3) < 0)
685 goto fault;
686 if (!__gdbstub_mark_bp(
687 pc + (s32) x, 0))
688 goto fault;
689 } else {
690 if (!__gdbstub_mark_bp(
691 pc + 6, 0))
692 goto fault;
693 }
694 break;
695
696 }
697 }
698
699 gdbstub_bkpt("Step: %02x at %p; %02x at %p\n",
700 step_bp[0].opcode[0], step_bp[0].addr,
701 step_bp[1].opcode[0], step_bp[1].addr);
702
703 if (step_bp[0].addr) {
704#ifdef GDBSTUB_USE_F7F7_AS_BREAKPOINT
705 if (gdbstub_write_byte(0xF7, step_bp[0].addr + 0) < 0 ||
706 gdbstub_write_byte(0xF7, step_bp[0].addr + 1) < 0)
707 goto fault;
708#else
709 if (gdbstub_write_byte(0xFF, step_bp[0].addr + 0) < 0)
710 goto fault;
711#endif
712 }
713
714 if (step_bp[1].addr) {
715#ifdef GDBSTUB_USE_F7F7_AS_BREAKPOINT
716 if (gdbstub_write_byte(0xF7, step_bp[1].addr + 0) < 0 ||
717 gdbstub_write_byte(0xF7, step_bp[1].addr + 1) < 0)
718 goto fault;
719#else
720 if (gdbstub_write_byte(0xFF, step_bp[1].addr + 0) < 0)
721 goto fault;
722#endif
723 }
724
725 return 0;
726
727 fault:
728 /* uh-oh - silly address alert, try and restore things */
729 __gdbstub_restore_bp();
730 return -EFAULT;
731}
732
733#ifdef CONFIG_GDBSTUB_CONSOLE
734
735void gdbstub_console_write(struct console *con, const char *p, unsigned n)
736{
737 static const char gdbstub_cr[] = { 0x0d };
738 char outbuf[26];
739 int qty;
740 u8 busy;
741
742 busy = gdbstub_busy;
743 gdbstub_busy = 1;
744
745 outbuf[0] = 'O';
746
747 while (n > 0) {
748 qty = 1;
749
750 while (n > 0 && qty < 20) {
751 mem2hex(p, outbuf + qty, 2, 0);
752 qty += 2;
753 if (*p == 0x0a) {
754 mem2hex(gdbstub_cr, outbuf + qty, 2, 0);
755 qty += 2;
756 }
757 p++;
758 n--;
759 }
760
761 outbuf[qty] = 0;
762 putpacket(outbuf);
763 }
764
765 gdbstub_busy = busy;
766}
767
768static kdev_t gdbstub_console_dev(struct console *con)
769{
770 return MKDEV(1, 3); /* /dev/null */
771}
772
773static struct console gdbstub_console = {
774 .name = "gdb",
775 .write = gdbstub_console_write,
776 .device = gdbstub_console_dev,
777 .flags = CON_PRINTBUFFER,
778 .index = -1,
779};
780
781#endif
782
783/*
784 * Convert the memory pointed to by mem into hex, placing result in buf.
785 * - if successful, return a pointer to the last char put in buf (NUL)
786 * - in case of mem fault, return NULL
787 * may_fault is non-zero if we are reading from arbitrary memory, but is
788 * currently not used.
789 */
790static
791unsigned char *mem2hex(const void *_mem, char *buf, int count, int may_fault)
792{
793 const u8 *mem = _mem;
794 u8 ch[4];
795
796 if ((u32) mem & 1 && count >= 1) {
797 if (gdbstub_read_byte(mem, ch) != 0)
798 return 0;
26824972 799 buf = pack_hex_byte(buf, ch[0]);
b920de1b
DH		 800 mem++;
801 count--;
802 }
803
804 if ((u32) mem & 3 && count >= 2) {
805 if (gdbstub_read_word(mem, ch) != 0)
806 return 0;
26824972
HH		 807 buf = pack_hex_byte(buf, ch[0]);
808 buf = pack_hex_byte(buf, ch[1]);
b920de1b
DH		 809 mem += 2;
810 count -= 2;
811 }
812
813 while (count >= 4) {
814 if (gdbstub_read_dword(mem, ch) != 0)
815 return 0;
26824972
HH		 816 buf = pack_hex_byte(buf, ch[0]);
817 buf = pack_hex_byte(buf, ch[1]);
818 buf = pack_hex_byte(buf, ch[2]);
819 buf = pack_hex_byte(buf, ch[3]);
b920de1b
DH		 820 mem += 4;
821 count -= 4;
822 }
823
824 if (count >= 2) {
825 if (gdbstub_read_word(mem, ch) != 0)
826 return 0;
26824972
HH		 827 buf = pack_hex_byte(buf, ch[0]);
828 buf = pack_hex_byte(buf, ch[1]);
b920de1b
DH		 829 mem += 2;
830 count -= 2;
831 }
832
833 if (count >= 1) {
834 if (gdbstub_read_byte(mem, ch) != 0)
835 return 0;
26824972 836 buf = pack_hex_byte(buf, ch[0]);
b920de1b
DH		 837 }
838
839 *buf = 0;
840 return buf;
841}
842
843/*
844 * convert the hex array pointed to by buf into binary to be placed in mem
845 * return a pointer to the character AFTER the last byte written
846 * may_fault is non-zero if we are reading from arbitrary memory, but is
847 * currently not used.
848 */
849static
850const char *hex2mem(const char *buf, void *_mem, int count, int may_fault)
851{
852 u8 *mem = _mem;
853 union {
854 u32 val;
855 u8 b[4];
856 } ch;
857
858 if ((u32) mem & 1 && count >= 1) {
859 ch.b[0] = hex(*buf++) << 4;
860 ch.b[0] |= hex(*buf++);
861 if (gdbstub_write_byte(ch.val, mem) != 0)
862 return 0;
863 mem++;
864 count--;
865 }
866
867 if ((u32) mem & 3 && count >= 2) {
868 ch.b[0] = hex(*buf++) << 4;
869 ch.b[0] |= hex(*buf++);
870 ch.b[1] = hex(*buf++) << 4;
871 ch.b[1] |= hex(*buf++);
872 if (gdbstub_write_word(ch.val, mem) != 0)
873 return 0;
874 mem += 2;
875 count -= 2;
876 }
877
878 while (count >= 4) {
879 ch.b[0] = hex(*buf++) << 4;
880 ch.b[0] |= hex(*buf++);
881 ch.b[1] = hex(*buf++) << 4;
882 ch.b[1] |= hex(*buf++);
883 ch.b[2] = hex(*buf++) << 4;
884 ch.b[2] |= hex(*buf++);
885 ch.b[3] = hex(*buf++) << 4;
886 ch.b[3] |= hex(*buf++);
887 if (gdbstub_write_dword(ch.val, mem) != 0)
888 return 0;
889 mem += 4;
890 count -= 4;
891 }
892
893 if (count >= 2) {
894 ch.b[0] = hex(*buf++) << 4;
895 ch.b[0] |= hex(*buf++);
896 ch.b[1] = hex(*buf++) << 4;
897 ch.b[1] |= hex(*buf++);
898 if (gdbstub_write_word(ch.val, mem) != 0)
899 return 0;
900 mem += 2;
901 count -= 2;
902 }
903
904 if (count >= 1) {
905 ch.b[0] = hex(*buf++) << 4;
906 ch.b[0] |= hex(*buf++);
907 if (gdbstub_write_byte(ch.val, mem) != 0)
908 return 0;
909 }
910
911 return buf;
912}
913
914/*
915 * This table contains the mapping between MN10300 exception codes, and
916 * signals, which are primarily what GDB understands. It also indicates
917 * which hardware traps we need to commandeer when initializing the stub.
918 */
919static const struct excep_to_sig_map {
920 enum exception_code excep; /* MN10300 exception code */
921 unsigned char signo; /* Signal that we map this into */
922} excep_to_sig_map[] = {
923 { EXCEP_ITLBMISS, SIGSEGV },
924 { EXCEP_DTLBMISS, SIGSEGV },
925 { EXCEP_TRAP, SIGTRAP },
926 { EXCEP_ISTEP, SIGTRAP },
927 { EXCEP_IBREAK, SIGTRAP },
928 { EXCEP_OBREAK, SIGTRAP },
929 { EXCEP_UNIMPINS, SIGILL },
930 { EXCEP_UNIMPEXINS, SIGILL },
931 { EXCEP_MEMERR, SIGSEGV },
932 { EXCEP_MISALIGN, SIGSEGV },
933 { EXCEP_BUSERROR, SIGBUS },
934 { EXCEP_ILLINSACC, SIGSEGV },
935 { EXCEP_ILLDATACC, SIGSEGV },
936 { EXCEP_IOINSACC, SIGSEGV },
937 { EXCEP_PRIVINSACC, SIGSEGV },
938 { EXCEP_PRIVDATACC, SIGSEGV },
939 { EXCEP_FPU_DISABLED, SIGFPE },
940 { EXCEP_FPU_UNIMPINS, SIGFPE },
941 { EXCEP_FPU_OPERATION, SIGFPE },
942 { EXCEP_WDT, SIGALRM },
943 { EXCEP_NMI, SIGQUIT },
944 { EXCEP_IRQ_LEVEL0, SIGINT },
945 { EXCEP_IRQ_LEVEL1, SIGINT },
946 { EXCEP_IRQ_LEVEL2, SIGINT },
947 { EXCEP_IRQ_LEVEL3, SIGINT },
948 { EXCEP_IRQ_LEVEL4, SIGINT },
949 { EXCEP_IRQ_LEVEL5, SIGINT },
950 { EXCEP_IRQ_LEVEL6, SIGINT },
951 { 0, 0}
952};
953
954/*
955 * convert the MN10300 exception code into a UNIX signal number
956 */
957static int computeSignal(enum exception_code excep)
958{
959 const struct excep_to_sig_map *map;
960
961 for (map = excep_to_sig_map; map->signo; map++)
962 if (map->excep == excep)
963 return map->signo;
964
965 return SIGHUP; /* default for things we don't know about */
966}
967
968static u32 gdbstub_fpcr, gdbstub_fpufs_array[32];
969
970/*
971 *
972 */
973static void gdbstub_store_fpu(void)
974{
975#ifdef CONFIG_FPU
976
977 asm volatile(
978 "or %2,epsw\n"
979#ifdef CONFIG_MN10300_PROC_MN103E010
980 "nop\n"
981 "nop\n"
982#endif
983 "mov %1, a1\n"
984 "fmov fs0, (a1+)\n"
985 "fmov fs1, (a1+)\n"
986 "fmov fs2, (a1+)\n"
987 "fmov fs3, (a1+)\n"
988 "fmov fs4, (a1+)\n"
989 "fmov fs5, (a1+)\n"
990 "fmov fs6, (a1+)\n"
991 "fmov fs7, (a1+)\n"
992 "fmov fs8, (a1+)\n"
993 "fmov fs9, (a1+)\n"
994 "fmov fs10, (a1+)\n"
995 "fmov fs11, (a1+)\n"
996 "fmov fs12, (a1+)\n"
997 "fmov fs13, (a1+)\n"
998 "fmov fs14, (a1+)\n"
999 "fmov fs15, (a1+)\n"
1000 "fmov fs16, (a1+)\n"
1001 "fmov fs17, (a1+)\n"
1002 "fmov fs18, (a1+)\n"
1003 "fmov fs19, (a1+)\n"
1004 "fmov fs20, (a1+)\n"
1005 "fmov fs21, (a1+)\n"
1006 "fmov fs22, (a1+)\n"
1007 "fmov fs23, (a1+)\n"
1008 "fmov fs24, (a1+)\n"
1009 "fmov fs25, (a1+)\n"
1010 "fmov fs26, (a1+)\n"
1011 "fmov fs27, (a1+)\n"
1012 "fmov fs28, (a1+)\n"
1013 "fmov fs29, (a1+)\n"
1014 "fmov fs30, (a1+)\n"
1015 "fmov fs31, (a1+)\n"
1016 "fmov fpcr, %0\n"
1017 : "=d"(gdbstub_fpcr)
1018 : "g" (&gdbstub_fpufs_array), "i"(EPSW_FE)
1019 : "a1"
1020 );
1021#endif
1022}
1023
1024/*
1025 *
1026 */
1027static void gdbstub_load_fpu(void)
1028{
1029#ifdef CONFIG_FPU
1030
1031 asm volatile(
1032 "or %1,epsw\n"
1033#ifdef CONFIG_MN10300_PROC_MN103E010
1034 "nop\n"
1035 "nop\n"
1036#endif
1037 "mov %0, a1\n"
1038 "fmov (a1+), fs0\n"
1039 "fmov (a1+), fs1\n"
1040 "fmov (a1+), fs2\n"
1041 "fmov (a1+), fs3\n"
1042 "fmov (a1+), fs4\n"
1043 "fmov (a1+), fs5\n"
1044 "fmov (a1+), fs6\n"
1045 "fmov (a1+), fs7\n"
1046 "fmov (a1+), fs8\n"
1047 "fmov (a1+), fs9\n"
1048 "fmov (a1+), fs10\n"
1049 "fmov (a1+), fs11\n"
1050 "fmov (a1+), fs12\n"
1051 "fmov (a1+), fs13\n"
1052 "fmov (a1+), fs14\n"
1053 "fmov (a1+), fs15\n"
1054 "fmov (a1+), fs16\n"
1055 "fmov (a1+), fs17\n"
1056 "fmov (a1+), fs18\n"
1057 "fmov (a1+), fs19\n"
1058 "fmov (a1+), fs20\n"
1059 "fmov (a1+), fs21\n"
1060 "fmov (a1+), fs22\n"
1061 "fmov (a1+), fs23\n"
1062 "fmov (a1+), fs24\n"
1063 "fmov (a1+), fs25\n"
1064 "fmov (a1+), fs26\n"
1065 "fmov (a1+), fs27\n"
1066 "fmov (a1+), fs28\n"
1067 "fmov (a1+), fs29\n"
1068 "fmov (a1+), fs30\n"
1069 "fmov (a1+), fs31\n"
1070 "fmov %2, fpcr\n"
1071 :
1072 : "g" (&gdbstub_fpufs_array), "i"(EPSW_FE), "d"(gdbstub_fpcr)
1073 : "a1"
1074 );
1075#endif
1076}
1077
1078/*
1079 * set a software breakpoint
1080 */
1081int gdbstub_set_breakpoint(u8 *addr, int len)
1082{
1083 int bkpt, loop, xloop;
1084
1085#ifdef GDBSTUB_USE_F7F7_AS_BREAKPOINT
1086 len = (len + 1) & ~1;
1087#endif
1088
1089 gdbstub_bkpt("setbkpt(%p,%d)\n", addr, len);
1090
1091 for (bkpt = 255; bkpt >= 0; bkpt--)
1092 if (!gdbstub_bkpts[bkpt].addr)
1093 break;
1094 if (bkpt < 0)
1095 return -ENOSPC;
1096
1097 for (loop = 0; loop < len; loop++)
1098 if (gdbstub_read_byte(&addr[loop],
1099 &gdbstub_bkpts[bkpt].origbytes[loop]
1100 ) < 0)
1101 return -EFAULT;
1102
1103 gdbstub_flush_caches = 1;
1104
1105#ifdef GDBSTUB_USE_F7F7_AS_BREAKPOINT
1106 for (loop = 0; loop < len; loop++)
1107 if (gdbstub_write_byte(0xF7, &addr[loop]) < 0)
1108 goto restore;
1109#else
1110 for (loop = 0; loop < len; loop++)
1111 if (gdbstub_write_byte(0xFF, &addr[loop]) < 0)
1112 goto restore;
1113#endif
1114
1115 gdbstub_bkpts[bkpt].addr = addr;
1116 gdbstub_bkpts[bkpt].len = len;
1117
1118 gdbstub_bkpt("Set BKPT[%02x]: %p-%p {%02x%02x%02x%02x%02x%02x%02x}\n",
1119 bkpt,
1120 gdbstub_bkpts[bkpt].addr,
1121 gdbstub_bkpts[bkpt].addr + gdbstub_bkpts[bkpt].len - 1,
1122 gdbstub_bkpts[bkpt].origbytes[0],
1123 gdbstub_bkpts[bkpt].origbytes[1],
1124 gdbstub_bkpts[bkpt].origbytes[2],
1125 gdbstub_bkpts[bkpt].origbytes[3],
1126 gdbstub_bkpts[bkpt].origbytes[4],
1127 gdbstub_bkpts[bkpt].origbytes[5],
1128 gdbstub_bkpts[bkpt].origbytes[6]
1129 );
1130
1131 return 0;
1132
1133restore:
1134 for (xloop = 0; xloop < loop; xloop++)
1135 gdbstub_write_byte(gdbstub_bkpts[bkpt].origbytes[xloop],
1136 addr + xloop);
1137 return -EFAULT;
1138}
1139
1140/*
1141 * clear a software breakpoint
1142 */
1143int gdbstub_clear_breakpoint(u8 *addr, int len)
1144{
1145 int bkpt, loop;
1146
1147#ifdef GDBSTUB_USE_F7F7_AS_BREAKPOINT
1148 len = (len + 1) & ~1;
1149#endif
1150
1151 gdbstub_bkpt("clearbkpt(%p,%d)\n", addr, len);
1152
1153 for (bkpt = 255; bkpt >= 0; bkpt--)
1154 if (gdbstub_bkpts[bkpt].addr == addr &&
1155 gdbstub_bkpts[bkpt].len == len)
1156 break;
1157 if (bkpt < 0)
1158 return -ENOENT;
1159
1160 gdbstub_bkpts[bkpt].addr = NULL;
1161
1162 gdbstub_flush_caches = 1;
1163
1164 for (loop = 0; loop < len; loop++)
1165 if (gdbstub_write_byte(gdbstub_bkpts[bkpt].origbytes[loop],
1166 addr + loop) < 0)
1167 return -EFAULT;
1168
1169 return 0;
1170}
1171
1172/*
1173 * This function does all command processing for interfacing to gdb
1174 * - returns 1 if the exception should be skipped, 0 otherwise.
1175 */
1176static int gdbstub(struct pt_regs *regs, enum exception_code excep)
1177{
1178 unsigned long *stack;
1179 unsigned long epsw, mdr;
1180 uint32_t zero, ssp;
1181 uint8_t broke;
1182 char *ptr;
1183 int sigval;
1184 int addr;
1185 int length;
1186 int loop;
1187
1188 if (excep == EXCEP_FPU_DISABLED)
1189 return 0;
1190
1191 gdbstub_flush_caches = 0;
1192
1193 mn10300_set_gdbleds(1);
1194
1195 asm volatile("mov mdr,%0" : "=d"(mdr));
368dd5ac
AT		 1196 local_save_flags(epsw);
1197 local_change_intr_mask_level(NUM2EPSW_IM(CONFIG_GDBSTUB_IRQ_LEVEL + 1));
b920de1b
DH		 1198
1199 gdbstub_store_fpu();
1200
1201#ifdef CONFIG_GDBSTUB_IMMEDIATE
1202 /* skip the initial pause loop */
1203 if (regs->pc == (unsigned long) __gdbstub_pause)
1204 regs->pc = (unsigned long) start_kernel;
1205#endif
1206
1207 /* if we were single stepping, restore the opcodes hoisted for the
1208 * breakpoint[s] */
1209 broke = 0;
1210 if ((step_bp[0].addr && step_bp[0].addr == (u8 *) regs->pc) ||
1211 (step_bp[1].addr && step_bp[1].addr == (u8 *) regs->pc))
1212 broke = 1;
1213
1214 __gdbstub_restore_bp();
1215
1216 if (gdbstub_rx_unget) {
1217 sigval = SIGINT;
1218 if (gdbstub_rx_unget != 3)
1219 goto packet_waiting;
1220 gdbstub_rx_unget = 0;
1221 }
1222
1223 stack = (unsigned long *) regs->sp;
1224 sigval = broke ? SIGTRAP : computeSignal(excep);
1225
1226 /* send information about a BUG() */
1227 if (!user_mode(regs) && excep == EXCEP_SYSCALL15) {
1228 const struct bug_entry *bug;
1229
1230 bug = find_bug(regs->pc);
1231 if (bug)
1232 goto found_bug;
1233 length = snprintf(trans_buffer, sizeof(trans_buffer),
1234 "BUG() at address %lx\n", regs->pc);
1235 goto send_bug_pkt;
1236
1237 found_bug:
1238 length = snprintf(trans_buffer, sizeof(trans_buffer),
1239 "BUG() at address %lx (%s:%d)\n",
1240 regs->pc, bug->file, bug->line);
1241
1242 send_bug_pkt:
1243 ptr = output_buffer;
1244 *ptr++ = 'O';
1245 ptr = mem2hex(trans_buffer, ptr, length, 0);
1246 *ptr = 0;
1247 putpacket(output_buffer);
1248
1249 regs->pc -= 2;
1250 sigval = SIGABRT;
1251 } else if (regs->pc == (unsigned long) __gdbstub_bug_trap) {
1252 regs->pc = regs->mdr;
1253 sigval = SIGABRT;
1254 }
1255
1256 /*
1257 * send a message to the debugger's user saying what happened if it may
1258 * not be clear cut (we can't map exceptions onto signals properly)
1259 */
1260 if (sigval != SIGINT && sigval != SIGTRAP && sigval != SIGILL) {
1261 static const char title[] = "Excep ", tbcberr[] = "BCBERR ";
1262 static const char crlf[] = "\r\n";
1263 char hx;
1264 u32 bcberr = BCBERR;
1265
1266 ptr = output_buffer;
1267 *ptr++ = 'O';
1268 ptr = mem2hex(title, ptr, sizeof(title) - 1, 0);
1269
26824972
HH		 1270 hx = hex_asc_hi(excep >> 8);
1271 ptr = pack_hex_byte(ptr, hx);
1272 hx = hex_asc_lo(excep >> 8);
1273 ptr = pack_hex_byte(ptr, hx);
1274 hx = hex_asc_hi(excep);
1275 ptr = pack_hex_byte(ptr, hx);
1276 hx = hex_asc_lo(excep);
1277 ptr = pack_hex_byte(ptr, hx);
b920de1b
DH		 1278
1279 ptr = mem2hex(crlf, ptr, sizeof(crlf) - 1, 0);
1280 *ptr = 0;
1281 putpacket(output_buffer); /* send it off... */
1282
1283 /* BCBERR */
1284 ptr = output_buffer;
1285 *ptr++ = 'O';
1286 ptr = mem2hex(tbcberr, ptr, sizeof(tbcberr) - 1, 0);
1287
26824972
HH		 1288 hx = hex_asc_hi(bcberr >> 24);
1289 ptr = pack_hex_byte(ptr, hx);
1290 hx = hex_asc_lo(bcberr >> 24);
1291 ptr = pack_hex_byte(ptr, hx);
1292 hx = hex_asc_hi(bcberr >> 16);
1293 ptr = pack_hex_byte(ptr, hx);
1294 hx = hex_asc_lo(bcberr >> 16);
1295 ptr = pack_hex_byte(ptr, hx);
1296 hx = hex_asc_hi(bcberr >> 8);
1297 ptr = pack_hex_byte(ptr, hx);
1298 hx = hex_asc_lo(bcberr >> 8);
1299 ptr = pack_hex_byte(ptr, hx);
1300 hx = hex_asc_hi(bcberr);
1301 ptr = pack_hex_byte(ptr, hx);
1302 hx = hex_asc_lo(bcberr);
1303 ptr = pack_hex_byte(ptr, hx);
b920de1b
DH		 1304
1305 ptr = mem2hex(crlf, ptr, sizeof(crlf) - 1, 0);
1306 *ptr = 0;
1307 putpacket(output_buffer); /* send it off... */
1308 }
1309
1310 /*
1311 * tell the debugger that an exception has occurred
1312 */
1313 ptr = output_buffer;
1314
1315 /*
1316 * Send trap type (converted to signal)
1317 */
1318 *ptr++ = 'T';
26824972 1319 ptr = pack_hex_byte(ptr, sigval);
b920de1b
DH		 1320
1321 /*
1322 * Send Error PC
1323 */
26824972 1324 ptr = pack_hex_byte(ptr, GDB_REGID_PC);
b920de1b
DH		 1325 *ptr++ = ':';
1326 ptr = mem2hex(&regs->pc, ptr, 4, 0);
1327 *ptr++ = ';';
1328
1329 /*
1330 * Send frame pointer
1331 */
26824972 1332 ptr = pack_hex_byte(ptr, GDB_REGID_FP);
b920de1b
DH		 1333 *ptr++ = ':';
1334 ptr = mem2hex(&regs->a3, ptr, 4, 0);
1335 *ptr++ = ';';
1336
1337 /*
1338 * Send stack pointer
1339 */
1340 ssp = (unsigned long) (regs + 1);
26824972 1341 ptr = pack_hex_byte(ptr, GDB_REGID_SP);
b920de1b
DH		 1342 *ptr++ = ':';
1343 ptr = mem2hex(&ssp, ptr, 4, 0);
1344 *ptr++ = ';';
1345
1346 *ptr++ = 0;
1347 putpacket(output_buffer); /* send it off... */
1348
1349packet_waiting:
1350 /*
1351 * Wait for input from remote GDB
1352 */
1353 while (1) {
1354 output_buffer[0] = 0;
1355 getpacket(input_buffer);
1356
1357 switch (input_buffer[0]) {
1358 /* request repeat of last signal number */
1359 case '?':
1360 output_buffer[0] = 'S';
26824972
HH		 1361 output_buffer[1] = hex_asc_hi(sigval);
1362 output_buffer[2] = hex_asc_lo(sigval);
b920de1b
DH		 1363 output_buffer[3] = 0;
1364 break;
1365
1366 case 'd':
1367 /* toggle debug flag */
1368 break;
1369
1370 /*
1371 * Return the value of the CPU registers
1372 */
1373 case 'g':
1374 zero = 0;
1375 ssp = (u32) (regs + 1);
1376 ptr = output_buffer;
1377 ptr = mem2hex(&regs->d0, ptr, 4, 0);
1378 ptr = mem2hex(&regs->d1, ptr, 4, 0);
1379 ptr = mem2hex(&regs->d2, ptr, 4, 0);
1380 ptr = mem2hex(&regs->d3, ptr, 4, 0);
1381 ptr = mem2hex(&regs->a0, ptr, 4, 0);
1382 ptr = mem2hex(&regs->a1, ptr, 4, 0);
1383 ptr = mem2hex(&regs->a2, ptr, 4, 0);
1384 ptr = mem2hex(&regs->a3, ptr, 4, 0);
1385
1386 ptr = mem2hex(&ssp, ptr, 4, 0); /* 8 */
1387 ptr = mem2hex(&regs->pc, ptr, 4, 0);
1388 ptr = mem2hex(&regs->mdr, ptr, 4, 0);
1389 ptr = mem2hex(&regs->epsw, ptr, 4, 0);
1390 ptr = mem2hex(&regs->lir, ptr, 4, 0);
1391 ptr = mem2hex(&regs->lar, ptr, 4, 0);
1392 ptr = mem2hex(&regs->mdrq, ptr, 4, 0);
1393
1394 ptr = mem2hex(&regs->e0, ptr, 4, 0); /* 15 */
1395 ptr = mem2hex(&regs->e1, ptr, 4, 0);
1396 ptr = mem2hex(&regs->e2, ptr, 4, 0);
1397 ptr = mem2hex(&regs->e3, ptr, 4, 0);
1398 ptr = mem2hex(&regs->e4, ptr, 4, 0);
1399 ptr = mem2hex(&regs->e5, ptr, 4, 0);
1400 ptr = mem2hex(&regs->e6, ptr, 4, 0);
1401 ptr = mem2hex(&regs->e7, ptr, 4, 0);
1402
1403 ptr = mem2hex(&ssp, ptr, 4, 0);
1404 ptr = mem2hex(&regs, ptr, 4, 0);
1405 ptr = mem2hex(&regs->sp, ptr, 4, 0);
1406 ptr = mem2hex(&regs->mcrh, ptr, 4, 0); /* 26 */
1407 ptr = mem2hex(&regs->mcrl, ptr, 4, 0);
1408 ptr = mem2hex(&regs->mcvf, ptr, 4, 0);
1409
1410 ptr = mem2hex(&gdbstub_fpcr, ptr, 4, 0); /* 29 - FPCR */
1411 ptr = mem2hex(&zero, ptr, 4, 0);
1412 ptr = mem2hex(&zero, ptr, 4, 0);
1413 for (loop = 0; loop < 32; loop++)
1414 ptr = mem2hex(&gdbstub_fpufs_array[loop],
1415 ptr, 4, 0); /* 32 - FS0-31 */
1416
1417 break;
1418
1419 /*
1420 * set the value of the CPU registers - return OK
1421 */
1422 case 'G':
1423 {
1424 const char *ptr;
1425
1426 ptr = &input_buffer[1];
1427 ptr = hex2mem(ptr, &regs->d0, 4, 0);
1428 ptr = hex2mem(ptr, &regs->d1, 4, 0);
1429 ptr = hex2mem(ptr, &regs->d2, 4, 0);
1430 ptr = hex2mem(ptr, &regs->d3, 4, 0);
1431 ptr = hex2mem(ptr, &regs->a0, 4, 0);
1432 ptr = hex2mem(ptr, &regs->a1, 4, 0);
1433 ptr = hex2mem(ptr, &regs->a2, 4, 0);
1434 ptr = hex2mem(ptr, &regs->a3, 4, 0);
1435
1436 ptr = hex2mem(ptr, &ssp, 4, 0); /* 8 */
1437 ptr = hex2mem(ptr, &regs->pc, 4, 0);
1438 ptr = hex2mem(ptr, &regs->mdr, 4, 0);
1439 ptr = hex2mem(ptr, &regs->epsw, 4, 0);
1440 ptr = hex2mem(ptr, &regs->lir, 4, 0);
1441 ptr = hex2mem(ptr, &regs->lar, 4, 0);
1442 ptr = hex2mem(ptr, &regs->mdrq, 4, 0);
1443
1444 ptr = hex2mem(ptr, &regs->e0, 4, 0); /* 15 */
1445 ptr = hex2mem(ptr, &regs->e1, 4, 0);
1446 ptr = hex2mem(ptr, &regs->e2, 4, 0);
1447 ptr = hex2mem(ptr, &regs->e3, 4, 0);
1448 ptr = hex2mem(ptr, &regs->e4, 4, 0);
1449 ptr = hex2mem(ptr, &regs->e5, 4, 0);
1450 ptr = hex2mem(ptr, &regs->e6, 4, 0);
1451 ptr = hex2mem(ptr, &regs->e7, 4, 0);
1452
1453 ptr = hex2mem(ptr, &ssp, 4, 0);
1454 ptr = hex2mem(ptr, &zero, 4, 0);
1455 ptr = hex2mem(ptr, &regs->sp, 4, 0);
1456 ptr = hex2mem(ptr, &regs->mcrh, 4, 0); /* 26 */
1457 ptr = hex2mem(ptr, &regs->mcrl, 4, 0);
1458 ptr = hex2mem(ptr, &regs->mcvf, 4, 0);
1459
1460 ptr = hex2mem(ptr, &zero, 4, 0); /* 29 - FPCR */
1461 ptr = hex2mem(ptr, &zero, 4, 0);
1462 ptr = hex2mem(ptr, &zero, 4, 0);
1463 for (loop = 0; loop < 32; loop++) /* 32 - FS0-31 */
1464 ptr = hex2mem(ptr, &zero, 4, 0);
1465
1466#if 0
1467 /*
1468 * See if the stack pointer has moved. If so, then copy
1469 * the saved locals and ins to the new location.
1470 */
1471 unsigned long *newsp = (unsigned long *) registers[SP];
1472 if (sp != newsp)
1473 sp = memcpy(newsp, sp, 16 * 4);
1474#endif
1475
1476 gdbstub_strcpy(output_buffer, "OK");
1477 }
1478 break;
1479
1480 /*
1481 * mAA..AA,LLLL Read LLLL bytes at address AA..AA
1482 */
1483 case 'm':
1484 ptr = &input_buffer[1];
1485
1486 if (hexToInt(&ptr, &addr) &&
1487 *ptr++ == ',' &&
1488 hexToInt(&ptr, &length)
1489 ) {
1490 if (mem2hex((char *) addr, output_buffer,
1491 length, 1))
1492 break;
1493 gdbstub_strcpy(output_buffer, "E03");
1494 } else {
1495 gdbstub_strcpy(output_buffer, "E01");
1496 }
1497 break;
1498
1499 /*
1500 * MAA..AA,LLLL: Write LLLL bytes at address AA.AA
1501 * return OK
1502 */
1503 case 'M':
1504 ptr = &input_buffer[1];
1505
1506 if (hexToInt(&ptr, &addr) &&
1507 *ptr++ == ',' &&
1508 hexToInt(&ptr, &length) &&
1509 *ptr++ == ':'
1510 ) {
1511 if (hex2mem(ptr, (char *) addr, length, 1))
1512 gdbstub_strcpy(output_buffer, "OK");
1513 else
1514 gdbstub_strcpy(output_buffer, "E03");
1515
1516 gdbstub_flush_caches = 1;
1517 } else {
1518 gdbstub_strcpy(output_buffer, "E02");
1519 }
1520 break;
1521
1522 /*
1523 * cAA..AA Continue at address AA..AA(optional)
1524 */
1525 case 'c':
1526 /* try to read optional parameter, pc unchanged if no
1527 * parm */
1528
1529 ptr = &input_buffer[1];
1530 if (hexToInt(&ptr, &addr))
1531 regs->pc = addr;
1532 goto done;
1533
1534 /*
1535 * kill the program
1536 */
1537 case 'k' :
1538 goto done; /* just continue */
1539
1540 /*
1541 * Reset the whole machine (FIXME: system dependent)
1542 */
1543 case 'r':
1544 break;
1545
1546 /*
1547 * Step to next instruction
1548 */
1549 case 's':
1550 /*
1551 * using the T flag doesn't seem to perform single
1552 * stepping (it seems to wind up being caught by the
1553 * JTAG unit), so we have to use breakpoints and
1554 * continue instead.
1555 */
1556 if (gdbstub_single_step(regs) < 0)
1557 /* ignore any fault error for now */
1558 gdbstub_printk("unable to set single-step"
1559 " bp\n");
1560 goto done;
1561
1562 /*
1563 * Set baud rate (bBB)
1564 */
1565 case 'b':
1566 do {
1567 int baudrate;
1568
1569 ptr = &input_buffer[1];
1570 if (!hexToInt(&ptr, &baudrate)) {
1571 gdbstub_strcpy(output_buffer, "B01");
1572 break;
1573 }
1574
1575 if (baudrate) {
1576 /* ACK before changing speed */
1577 putpacket("OK");
1578 gdbstub_io_set_baud(baudrate);
1579 }
1580 } while (0);
1581 break;
1582
1583 /*
1584 * Set breakpoint
1585 */
1586 case 'Z':
1587 ptr = &input_buffer[1];
1588
1589 if (!hexToInt(&ptr, &loop) || *ptr++ != ',' ||
1590 !hexToInt(&ptr, &addr) || *ptr++ != ',' ||
1591 !hexToInt(&ptr, &length)
1592 ) {
1593 gdbstub_strcpy(output_buffer, "E01");
1594 break;
1595 }
1596
1597 /* only support software breakpoints */
1598 gdbstub_strcpy(output_buffer, "E03");
1599 if (loop != 0 ||
1600 length < 1 ||
1601 length > 7 ||
1602 (unsigned long) addr < 4096)
1603 break;
1604
1605 if (gdbstub_set_breakpoint((u8 *) addr, length) < 0)
1606 break;
1607
1608 gdbstub_strcpy(output_buffer, "OK");
1609 break;
1610
1611 /*
1612 * Clear breakpoint
1613 */
1614 case 'z':
1615 ptr = &input_buffer[1];
1616
1617 if (!hexToInt(&ptr, &loop) || *ptr++ != ',' ||
1618 !hexToInt(&ptr, &addr) || *ptr++ != ',' ||
1619 !hexToInt(&ptr, &length)
1620 ) {
1621 gdbstub_strcpy(output_buffer, "E01");
1622 break;
1623 }
1624
1625 /* only support software breakpoints */
1626 gdbstub_strcpy(output_buffer, "E03");
1627 if (loop != 0 ||
1628 length < 1 ||
1629 length > 7 ||
1630 (unsigned long) addr < 4096)
1631 break;
1632
1633 if (gdbstub_clear_breakpoint((u8 *) addr, length) < 0)
1634 break;
1635
1636 gdbstub_strcpy(output_buffer, "OK");
1637 break;
1638
1639 default:
1640 gdbstub_proto("### GDB Unsupported Cmd '%s'\n",
1641 input_buffer);
1642 break;
1643 }
1644
1645 /* reply to the request */
1646 putpacket(output_buffer);
1647 }
1648
1649done:
1650 /*
1651 * Need to flush the instruction cache here, as we may
1652 * have deposited a breakpoint, and the icache probably
1653 * has no way of knowing that a data ref to some location
1654 * may have changed something that is in the instruction
1655 * cache.
1656 * NB: We flush both caches, just to be sure...
1657 */
1658 if (gdbstub_flush_caches)
1659 gdbstub_purge_cache();
1660
1661 gdbstub_load_fpu();
1662 mn10300_set_gdbleds(0);
1663 if (excep == EXCEP_NMI)
1664 NMICR = NMICR_NMIF;
1665
1666 touch_softlockup_watchdog();
1667
1668 local_irq_restore(epsw);
1669 return 1;
1670}
1671
1672/*
1673 * handle event interception
1674 */
1675asmlinkage int gdbstub_intercept(struct pt_regs *regs,
1676 enum exception_code excep)
1677{
1678 static u8 notfirst = 1;
1679 int ret;
1680
1681 if (gdbstub_busy)
1682 gdbstub_printk("--> gdbstub reentered itself\n");
1683 gdbstub_busy = 1;
1684
1685 if (notfirst) {
1686 unsigned long mdr;
1687 asm("mov mdr,%0" : "=d"(mdr));
1688
1689 gdbstub_entry(
1690 "--> gdbstub_intercept(%p,%04x) [MDR=%lx PC=%lx]\n",
1691 regs, excep, mdr, regs->pc);
1692
1693 gdbstub_entry(
1694 "PC: %08lx EPSW: %08lx SSP: %08lx mode: %s\n",
1695 regs->pc, regs->epsw, (unsigned long) &ret,
1696 user_mode(regs) ? "User" : "Super");
1697 gdbstub_entry(
1698 "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
1699 regs->d0, regs->d1, regs->d2, regs->d3);
1700 gdbstub_entry(
1701 "a0: %08lx a1: %08lx a2: %08lx a3: %08lx\n",
1702 regs->a0, regs->a1, regs->a2, regs->a3);
1703 gdbstub_entry(
1704 "e0: %08lx e1: %08lx e2: %08lx e3: %08lx\n",
1705 regs->e0, regs->e1, regs->e2, regs->e3);
1706 gdbstub_entry(
1707 "e4: %08lx e5: %08lx e6: %08lx e7: %08lx\n",
1708 regs->e4, regs->e5, regs->e6, regs->e7);
1709 gdbstub_entry(
1710 "lar: %08lx lir: %08lx mdr: %08lx usp: %08lx\n",
1711 regs->lar, regs->lir, regs->mdr, regs->sp);
1712 gdbstub_entry(
1713 "cvf: %08lx crl: %08lx crh: %08lx drq: %08lx\n",
1714 regs->mcvf, regs->mcrl, regs->mcrh, regs->mdrq);
1715 gdbstub_entry(
1716 "threadinfo=%p task=%p)\n",
1717 current_thread_info(), current);
1718 } else {
1719 notfirst = 1;
1720 }
1721
1722 ret = gdbstub(regs, excep);
1723
1724 gdbstub_entry("<-- gdbstub_intercept()\n");
1725 gdbstub_busy = 0;
1726 return ret;
1727}
1728
1729/*
1730 * handle the GDB stub itself causing an exception
1731 */
1732asmlinkage void gdbstub_exception(struct pt_regs *regs,
1733 enum exception_code excep)
1734{
1735 unsigned long mdr;
1736
1737 asm("mov mdr,%0" : "=d"(mdr));
1738 gdbstub_entry("--> gdbstub exception({%p},%04x) [MDR=%lx]\n",
1739 regs, excep, mdr);
1740
1741 while ((unsigned long) regs == 0xffffffff) {}
1742
1743 /* handle guarded memory accesses where we know it might fault */
1744 if (regs->pc == (unsigned) gdbstub_read_byte_guard) {
1745 regs->pc = (unsigned) gdbstub_read_byte_cont;
1746 goto fault;
1747 }
1748
1749 if (regs->pc == (unsigned) gdbstub_read_word_guard) {
1750 regs->pc = (unsigned) gdbstub_read_word_cont;
1751 goto fault;
1752 }
1753
1754 if (regs->pc == (unsigned) gdbstub_read_dword_guard) {
1755 regs->pc = (unsigned) gdbstub_read_dword_cont;
1756 goto fault;
1757 }
1758
1759 if (regs->pc == (unsigned) gdbstub_write_byte_guard) {
1760 regs->pc = (unsigned) gdbstub_write_byte_cont;
1761 goto fault;
1762 }
1763
1764 if (regs->pc == (unsigned) gdbstub_write_word_guard) {
1765 regs->pc = (unsigned) gdbstub_write_word_cont;
1766 goto fault;
1767 }
1768
1769 if (regs->pc == (unsigned) gdbstub_write_dword_guard) {
1770 regs->pc = (unsigned) gdbstub_write_dword_cont;
1771 goto fault;
1772 }
1773
1774 gdbstub_printk("\n### GDB stub caused an exception ###\n");
1775
1776 /* something went horribly wrong */
1777 console_verbose();
1778 show_registers(regs);
1779
1780 panic("GDB Stub caused an unexpected exception - can't continue\n");
1781
1782 /* we caught an attempt by the stub to access silly memory */
1783fault:
1784 gdbstub_entry("<-- gdbstub exception() = EFAULT\n");
1785 regs->d0 = -EFAULT;
1786 return;
1787}
1788
1789/*
1790 * send an exit message to GDB
1791 */
1792void gdbstub_exit(int status)
1793{
1794 unsigned char checksum;
1795 unsigned char ch;
1796 int count;
1797
1798 gdbstub_busy = 1;
1799 output_buffer[0] = 'W';
26824972
HH		 1800 output_buffer[1] = hex_asc_hi(status);
1801 output_buffer[2] = hex_asc_lo(status);
b920de1b
DH		 1802 output_buffer[3] = 0;
1803
1804 gdbstub_io_tx_char('$');
1805 checksum = 0;
1806 count = 0;
1807
1808 while ((ch = output_buffer[count]) != 0) {
1809 gdbstub_io_tx_char(ch);
1810 checksum += ch;
1811 count += 1;
1812 }
1813
1814 gdbstub_io_tx_char('#');
26824972
HH		 1815 gdbstub_io_tx_char(hex_asc_hi(checksum));
1816 gdbstub_io_tx_char(hex_asc_lo(checksum));
b920de1b
DH		 1817
1818 /* make sure the output is flushed, or else RedBoot might clobber it */
1819 gdbstub_io_tx_flush();
1820
1821 gdbstub_busy = 0;
1822}
1823
1824/*
1825 * initialise the GDB stub
1826 */
1827asmlinkage void __init gdbstub_init(void)
1828{
1829#ifdef CONFIG_GDBSTUB_IMMEDIATE
1830 unsigned char ch;
1831 int ret;
1832#endif
1833
1834 gdbstub_busy = 1;
1835
1836 printk(KERN_INFO "%s", gdbstub_banner);
1837
1838 gdbstub_io_init();
1839
1840 gdbstub_entry("--> gdbstub_init\n");
1841
1842 /* try to talk to GDB (or anyone insane enough to want to type GDB
1843 * protocol by hand) */
1844 gdbstub_io("### GDB Tx ACK\n");
1845 gdbstub_io_tx_char('+'); /* 'hello world' */
1846
1847#ifdef CONFIG_GDBSTUB_IMMEDIATE
1848 gdbstub_printk("GDB Stub waiting for packet\n");
1849
1850 /* in case GDB is started before us, ACK any packets that are already
1851 * sitting there (presumably "$?#xx")
1852 */
1853 do { gdbstub_io_rx_char(&ch, 0); } while (ch != '$');
1854 do { gdbstub_io_rx_char(&ch, 0); } while (ch != '#');
1855 /* eat first csum byte */
1856 do { ret = gdbstub_io_rx_char(&ch, 0); } while (ret != 0);
1857 /* eat second csum byte */
1858 do { ret = gdbstub_io_rx_char(&ch, 0); } while (ret != 0);
1859
1860 gdbstub_io("### GDB Tx NAK\n");
1861 gdbstub_io_tx_char('-'); /* NAK it */
1862
1863#else
1864 printk("GDB Stub ready\n");
1865#endif
1866
1867 gdbstub_busy = 0;
1868 gdbstub_entry("<-- gdbstub_init\n");
1869}
1870
1871/*
1872 * register the console at a more appropriate time
1873 */
1874#ifdef CONFIG_GDBSTUB_CONSOLE
1875static int __init gdbstub_postinit(void)
1876{
1877 printk(KERN_NOTICE "registering console\n");
1878 register_console(&gdbstub_console);
1879 return 0;
1880}
1881
1882__initcall(gdbstub_postinit);
1883#endif
1884
1885/*
1886 * handle character reception on GDB serial port
1887 * - jump into the GDB stub if BREAK is detected on the serial line
1888 */
1889asmlinkage void gdbstub_rx_irq(struct pt_regs *regs, enum exception_code excep)
1890{
1891 char ch;
1892 int ret;
1893
1894 gdbstub_entry("--> gdbstub_rx_irq\n");
1895
1896 do {
1897 ret = gdbstub_io_rx_char(&ch, 1);
1898 if (ret != -EIO && ret != -EAGAIN) {
1899 if (ret != -EINTR)
1900 gdbstub_rx_unget = ch;
1901 gdbstub(regs, excep);
1902 }
1903 } while (ret != -EAGAIN);
1904
1905 gdbstub_entry("<-- gdbstub_rx_irq\n");
1906}
kernel source for telekom puls (alcatel/mediatek)