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 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
127 #include <asm/asm-offsets.h>
128 #include <asm/pgtable.h>
129 #include <asm/gdb-stub.h>
130
131 #define LEDS(x) do { /* *(u32*)0xe1200004 = ~(x); mb(); */ } while(0)
132
133 #undef GDBSTUB_DEBUG_PROTOCOL
134
135 extern void debug_to_serial(const char *p, int n);
136 extern void gdbstub_console_write(struct console *co, const char *p, unsigned n);
137
138 extern volatile uint32_t __break_error_detect[3]; /* ESFR1, ESR15, EAR15 */
139
140 struct __debug_amr {
141 unsigned long L, P;
142 } __attribute__((aligned(8)));
143
144 struct __debug_mmu {
145 struct {
146 unsigned long hsr0, pcsr, esr0, ear0, epcr0;
147 #ifdef CONFIG_MMU
148 unsigned long tplr, tppr, tpxr, cxnr;
149 #endif
150 } regs;
151
152 struct __debug_amr iamr[16];
153 struct __debug_amr damr[16];
154
155 #ifdef CONFIG_MMU
156 struct __debug_amr tlb[64*2];
157 #endif
158 };
159
160 static struct __debug_mmu __debug_mmu;
161
162 /*
163 * BUFMAX defines the maximum number of characters in inbound/outbound buffers
164 * at least NUMREGBYTES*2 are needed for register packets
165 */
166 #define BUFMAX 2048
167
168 #define BREAK_INSN 0x801000c0 /* use "break" as bkpt */
169
170 static const char gdbstub_banner[] = "Linux/FR-V GDB Stub (c) RedHat 2003\n";
171
172 volatile u8 gdbstub_rx_buffer[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
173 volatile u32 gdbstub_rx_inp = 0;
174 volatile u32 gdbstub_rx_outp = 0;
175 volatile u8 gdbstub_rx_overflow = 0;
176 u8 gdbstub_rx_unget = 0;
177
178 /* set with GDB whilst running to permit step through exceptions */
179 extern volatile u32 __attribute__((section(".bss"))) gdbstub_trace_through_exceptions;
180
181 static char input_buffer[BUFMAX];
182 static char output_buffer[BUFMAX];
183
184 static const char *regnames[] = {
185 "PSR ", "ISR ", "CCR ", "CCCR",
186 "LR ", "LCR ", "PC ", "_stt",
187 "sys ", "GR8*", "GNE0", "GNE1",
188 "IACH", "IACL",
189 "TBR ", "SP ", "FP ", "GR3 ",
190 "GR4 ", "GR5 ", "GR6 ", "GR7 ",
191 "GR8 ", "GR9 ", "GR10", "GR11",
192 "GR12", "GR13", "GR14", "GR15",
193 "GR16", "GR17", "GR18", "GR19",
194 "GR20", "GR21", "GR22", "GR23",
195 "GR24", "GR25", "GR26", "GR27",
196 "EFRM", "CURR", "GR30", "BFRM"
197 };
198
199 struct gdbstub_bkpt {
200 unsigned long addr; /* address of breakpoint */
201 unsigned len; /* size of breakpoint */
202 uint32_t originsns[7]; /* original instructions */
203 };
204
205 static struct gdbstub_bkpt gdbstub_bkpts[256];
206
207 /*
208 * local prototypes
209 */
210
211 static void gdbstub_recv_packet(char *buffer);
212 static int gdbstub_send_packet(char *buffer);
213 static int gdbstub_compute_signal(unsigned long tbr);
214 static int hex(unsigned char ch);
215 static int hexToInt(char **ptr, unsigned long *intValue);
216 static unsigned char *mem2hex(const void *mem, char *buf, int count, int may_fault);
217 static char *hex2mem(const char *buf, void *_mem, int count);
218
219 /*
220 * Convert ch from a hex digit to an int
221 */
hex(unsigned char ch)222 static int hex(unsigned char ch)
223 {
224 if (ch >= 'a' && ch <= 'f')
225 return ch-'a'+10;
226 if (ch >= '0' && ch <= '9')
227 return ch-'0';
228 if (ch >= 'A' && ch <= 'F')
229 return ch-'A'+10;
230 return -1;
231 }
232
gdbstub_printk(const char * fmt,...)233 void gdbstub_printk(const char *fmt, ...)
234 {
235 static char buf[1024];
236 va_list args;
237 int len;
238
239 /* Emit the output into the temporary buffer */
240 va_start(args, fmt);
241 len = vsnprintf(buf, sizeof(buf), fmt, args);
242 va_end(args);
243 debug_to_serial(buf, len);
244 }
245
gdbstub_strcpy(char * dst,const char * src)246 static inline char *gdbstub_strcpy(char *dst, const char *src)
247 {
248 int loop = 0;
249 while ((dst[loop] = src[loop]))
250 loop++;
251 return dst;
252 }
253
gdbstub_purge_cache(void)254 static void gdbstub_purge_cache(void)
255 {
256 asm volatile(" dcef @(gr0,gr0),#1 \n"
257 " icei @(gr0,gr0),#1 \n"
258 " membar \n"
259 " bar \n"
260 );
261 }
262
263 /*****************************************************************************/
264 /*
265 * scan for the sequence $<data>#<checksum>
266 */
gdbstub_recv_packet(char * buffer)267 static void gdbstub_recv_packet(char *buffer)
268 {
269 unsigned char checksum;
270 unsigned char xmitcsum;
271 unsigned char ch;
272 int count, i, ret, error;
273
274 for (;;) {
275 /* wait around for the start character, ignore all other characters */
276 do {
277 gdbstub_rx_char(&ch, 0);
278 } while (ch != '$');
279
280 checksum = 0;
281 xmitcsum = -1;
282 count = 0;
283 error = 0;
284
285 /* now, read until a # or end of buffer is found */
286 while (count < BUFMAX) {
287 ret = gdbstub_rx_char(&ch, 0);
288 if (ret < 0)
289 error = ret;
290
291 if (ch == '#')
292 break;
293 checksum += ch;
294 buffer[count] = ch;
295 count++;
296 }
297
298 if (error == -EIO) {
299 gdbstub_proto("### GDB Rx Error - Skipping packet ###\n");
300 gdbstub_proto("### GDB Tx NAK\n");
301 gdbstub_tx_char('-');
302 continue;
303 }
304
305 if (count >= BUFMAX || error)
306 continue;
307
308 buffer[count] = 0;
309
310 /* read the checksum */
311 ret = gdbstub_rx_char(&ch, 0);
312 if (ret < 0)
313 error = ret;
314 xmitcsum = hex(ch) << 4;
315
316 ret = gdbstub_rx_char(&ch, 0);
317 if (ret < 0)
318 error = ret;
319 xmitcsum |= hex(ch);
320
321 if (error) {
322 if (error == -EIO)
323 gdbstub_proto("### GDB Rx Error - Skipping packet\n");
324 gdbstub_proto("### GDB Tx NAK\n");
325 gdbstub_tx_char('-');
326 continue;
327 }
328
329 /* check the checksum */
330 if (checksum != xmitcsum) {
331 gdbstub_proto("### GDB Tx NAK\n");
332 gdbstub_tx_char('-'); /* failed checksum */
333 continue;
334 }
335
336 gdbstub_proto("### GDB Rx '$%s#%02x' ###\n", buffer, checksum);
337 gdbstub_proto("### GDB Tx ACK\n");
338 gdbstub_tx_char('+'); /* successful transfer */
339
340 /* if a sequence char is present, reply the sequence ID */
341 if (buffer[2] == ':') {
342 gdbstub_tx_char(buffer[0]);
343 gdbstub_tx_char(buffer[1]);
344
345 /* remove sequence chars from buffer */
346 count = 0;
347 while (buffer[count]) count++;
348 for (i=3; i <= count; i++)
349 buffer[i - 3] = buffer[i];
350 }
351
352 break;
353 }
354 } /* end gdbstub_recv_packet() */
355
356 /*****************************************************************************/
357 /*
358 * send the packet in buffer.
359 * - return 0 if successfully ACK'd
360 * - return 1 if abandoned due to new incoming packet
361 */
gdbstub_send_packet(char * buffer)362 static int gdbstub_send_packet(char *buffer)
363 {
364 unsigned char checksum;
365 int count;
366 unsigned char ch;
367
368 /* $<packet info>#<checksum> */
369 gdbstub_proto("### GDB Tx '%s' ###\n", buffer);
370
371 do {
372 gdbstub_tx_char('$');
373 checksum = 0;
374 count = 0;
375
376 while ((ch = buffer[count]) != 0) {
377 gdbstub_tx_char(ch);
378 checksum += ch;
379 count += 1;
380 }
381
382 gdbstub_tx_char('#');
383 gdbstub_tx_char(hex_asc_hi(checksum));
384 gdbstub_tx_char(hex_asc_lo(checksum));
385
386 } while (gdbstub_rx_char(&ch,0),
387 #ifdef GDBSTUB_DEBUG_PROTOCOL
388 ch=='-' && (gdbstub_proto("### GDB Rx NAK\n"),0),
389 ch!='-' && ch!='+' && (gdbstub_proto("### GDB Rx ??? %02x\n",ch),0),
390 #endif
391 ch!='+' && ch!='$');
392
393 if (ch=='+') {
394 gdbstub_proto("### GDB Rx ACK\n");
395 return 0;
396 }
397
398 gdbstub_proto("### GDB Tx Abandoned\n");
399 gdbstub_rx_unget = ch;
400 return 1;
401 } /* end gdbstub_send_packet() */
402
403 /*
404 * While we find nice hex chars, build an int.
405 * Return number of chars processed.
406 */
hexToInt(char ** ptr,unsigned long * _value)407 static int hexToInt(char **ptr, unsigned long *_value)
408 {
409 int count = 0, ch;
410
411 *_value = 0;
412 while (**ptr) {
413 ch = hex(**ptr);
414 if (ch < 0)
415 break;
416
417 *_value = (*_value << 4) | ((uint8_t) ch & 0xf);
418 count++;
419
420 (*ptr)++;
421 }
422
423 return count;
424 }
425
426 /*****************************************************************************/
427 /*
428 * probe an address to see whether it maps to anything
429 */
gdbstub_addr_probe(const void * vaddr)430 static inline int gdbstub_addr_probe(const void *vaddr)
431 {
432 #ifdef CONFIG_MMU
433 unsigned long paddr;
434
435 asm("lrad %1,%0,#1,#0,#0" : "=r"(paddr) : "r"(vaddr));
436 if (!(paddr & xAMPRx_V))
437 return 0;
438 #endif
439
440 return 1;
441 } /* end gdbstub_addr_probe() */
442
443 #ifdef CONFIG_MMU
444 static unsigned long __saved_dampr, __saved_damlr;
445
gdbstub_virt_to_pte(unsigned long vaddr)446 static inline unsigned long gdbstub_virt_to_pte(unsigned long vaddr)
447 {
448 pgd_t *pgd;
449 pud_t *pud;
450 pmd_t *pmd;
451 pte_t *pte;
452 unsigned long val, dampr5;
453
454 pgd = (pgd_t *) __get_DAMLR(3) + pgd_index(vaddr);
455 pud = pud_offset(pgd, vaddr);
456 pmd = pmd_offset(pud, vaddr);
457
458 if (pmd_bad(*pmd) || !pmd_present(*pmd))
459 return 0;
460
461 /* make sure dampr5 maps to the correct pmd */
462 dampr5 = __get_DAMPR(5);
463 val = pmd_val(*pmd);
464 __set_DAMPR(5, val | xAMPRx_L | xAMPRx_SS_16Kb | xAMPRx_S | xAMPRx_C | xAMPRx_V);
465
466 /* now its safe to access pmd */
467 pte = (pte_t *)__get_DAMLR(5) + __pte_index(vaddr);
468 if (pte_present(*pte))
469 val = pte_val(*pte);
470 else
471 val = 0;
472
473 /* restore original dampr5 */
474 __set_DAMPR(5, dampr5);
475
476 return val;
477 }
478 #endif
479
gdbstub_addr_map(const void * vaddr)480 static inline int gdbstub_addr_map(const void *vaddr)
481 {
482 #ifdef CONFIG_MMU
483 unsigned long pte;
484
485 __saved_dampr = __get_DAMPR(2);
486 __saved_damlr = __get_DAMLR(2);
487 #endif
488 if (gdbstub_addr_probe(vaddr))
489 return 1;
490 #ifdef CONFIG_MMU
491 pte = gdbstub_virt_to_pte((unsigned long) vaddr);
492 if (pte) {
493 __set_DAMPR(2, pte);
494 __set_DAMLR(2, (unsigned long) vaddr & PAGE_MASK);
495 return 1;
496 }
497 #endif
498 return 0;
499 }
500
gdbstub_addr_unmap(void)501 static inline void gdbstub_addr_unmap(void)
502 {
503 #ifdef CONFIG_MMU
504 __set_DAMPR(2, __saved_dampr);
505 __set_DAMLR(2, __saved_damlr);
506 #endif
507 }
508
509 /*
510 * access potentially dodgy memory through a potentially dodgy pointer
511 */
gdbstub_read_dword(const void * addr,uint32_t * _res)512 static inline int gdbstub_read_dword(const void *addr, uint32_t *_res)
513 {
514 unsigned long brr;
515 uint32_t res;
516
517 if (!gdbstub_addr_map(addr))
518 return 0;
519
520 asm volatile(" movgs gr0,brr \n"
521 " ld%I2 %M2,%0 \n"
522 " movsg brr,%1 \n"
523 : "=r"(res), "=r"(brr)
524 : "m"(*(uint32_t *) addr));
525 *_res = res;
526 gdbstub_addr_unmap();
527 return likely(!brr);
528 }
529
gdbstub_write_dword(void * addr,uint32_t val)530 static inline int gdbstub_write_dword(void *addr, uint32_t val)
531 {
532 unsigned long brr;
533
534 if (!gdbstub_addr_map(addr))
535 return 0;
536
537 asm volatile(" movgs gr0,brr \n"
538 " st%I2 %1,%M2 \n"
539 " movsg brr,%0 \n"
540 : "=r"(brr)
541 : "r"(val), "m"(*(uint32_t *) addr));
542 gdbstub_addr_unmap();
543 return likely(!brr);
544 }
545
gdbstub_read_word(const void * addr,uint16_t * _res)546 static inline int gdbstub_read_word(const void *addr, uint16_t *_res)
547 {
548 unsigned long brr;
549 uint16_t res;
550
551 if (!gdbstub_addr_map(addr))
552 return 0;
553
554 asm volatile(" movgs gr0,brr \n"
555 " lduh%I2 %M2,%0 \n"
556 " movsg brr,%1 \n"
557 : "=r"(res), "=r"(brr)
558 : "m"(*(uint16_t *) addr));
559 *_res = res;
560 gdbstub_addr_unmap();
561 return likely(!brr);
562 }
563
gdbstub_write_word(void * addr,uint16_t val)564 static inline int gdbstub_write_word(void *addr, uint16_t val)
565 {
566 unsigned long brr;
567
568 if (!gdbstub_addr_map(addr))
569 return 0;
570
571 asm volatile(" movgs gr0,brr \n"
572 " sth%I2 %1,%M2 \n"
573 " movsg brr,%0 \n"
574 : "=r"(brr)
575 : "r"(val), "m"(*(uint16_t *) addr));
576 gdbstub_addr_unmap();
577 return likely(!brr);
578 }
579
gdbstub_read_byte(const void * addr,uint8_t * _res)580 static inline int gdbstub_read_byte(const void *addr, uint8_t *_res)
581 {
582 unsigned long brr;
583 uint8_t res;
584
585 if (!gdbstub_addr_map(addr))
586 return 0;
587
588 asm volatile(" movgs gr0,brr \n"
589 " ldub%I2 %M2,%0 \n"
590 " movsg brr,%1 \n"
591 : "=r"(res), "=r"(brr)
592 : "m"(*(uint8_t *) addr));
593 *_res = res;
594 gdbstub_addr_unmap();
595 return likely(!brr);
596 }
597
gdbstub_write_byte(void * addr,uint8_t val)598 static inline int gdbstub_write_byte(void *addr, uint8_t val)
599 {
600 unsigned long brr;
601
602 if (!gdbstub_addr_map(addr))
603 return 0;
604
605 asm volatile(" movgs gr0,brr \n"
606 " stb%I2 %1,%M2 \n"
607 " movsg brr,%0 \n"
608 : "=r"(brr)
609 : "r"(val), "m"(*(uint8_t *) addr));
610 gdbstub_addr_unmap();
611 return likely(!brr);
612 }
613
__gdbstub_console_write(struct console * co,const char * p,unsigned n)614 static void __gdbstub_console_write(struct console *co, const char *p, unsigned n)
615 {
616 char outbuf[26];
617 int qty;
618
619 outbuf[0] = 'O';
620
621 while (n > 0) {
622 qty = 1;
623
624 while (n > 0 && qty < 20) {
625 mem2hex(p, outbuf + qty, 2, 0);
626 qty += 2;
627 if (*p == 0x0a) {
628 outbuf[qty++] = '0';
629 outbuf[qty++] = 'd';
630 }
631 p++;
632 n--;
633 }
634
635 outbuf[qty] = 0;
636 gdbstub_send_packet(outbuf);
637 }
638 }
639
640 #if 0
641 void debug_to_serial(const char *p, int n)
642 {
643 gdbstub_console_write(NULL,p,n);
644 }
645 #endif
646
647 #ifdef CONFIG_GDB_CONSOLE
648
649 static struct console gdbstub_console = {
650 .name = "gdb",
651 .write = gdbstub_console_write, /* in break.S */
652 .flags = CON_PRINTBUFFER,
653 .index = -1,
654 };
655
656 #endif
657
658 /*****************************************************************************/
659 /*
660 * Convert the memory pointed to by mem into hex, placing result in buf.
661 * - if successful, return a pointer to the last char put in buf (NUL)
662 * - in case of mem fault, return NULL
663 * may_fault is non-zero if we are reading from arbitrary memory, but is currently
664 * not used.
665 */
mem2hex(const void * _mem,char * buf,int count,int may_fault)666 static unsigned char *mem2hex(const void *_mem, char *buf, int count, int may_fault)
667 {
668 const uint8_t *mem = _mem;
669 uint8_t ch[4] __attribute__((aligned(4)));
670
671 if ((uint32_t)mem&1 && count>=1) {
672 if (!gdbstub_read_byte(mem,ch))
673 return NULL;
674 buf = hex_byte_pack(buf, ch[0]);
675 mem++;
676 count--;
677 }
678
679 if ((uint32_t)mem&3 && count>=2) {
680 if (!gdbstub_read_word(mem,(uint16_t *)ch))
681 return NULL;
682 buf = hex_byte_pack(buf, ch[0]);
683 buf = hex_byte_pack(buf, ch[1]);
684 mem += 2;
685 count -= 2;
686 }
687
688 while (count>=4) {
689 if (!gdbstub_read_dword(mem,(uint32_t *)ch))
690 return NULL;
691 buf = hex_byte_pack(buf, ch[0]);
692 buf = hex_byte_pack(buf, ch[1]);
693 buf = hex_byte_pack(buf, ch[2]);
694 buf = hex_byte_pack(buf, ch[3]);
695 mem += 4;
696 count -= 4;
697 }
698
699 if (count>=2) {
700 if (!gdbstub_read_word(mem,(uint16_t *)ch))
701 return NULL;
702 buf = hex_byte_pack(buf, ch[0]);
703 buf = hex_byte_pack(buf, ch[1]);
704 mem += 2;
705 count -= 2;
706 }
707
708 if (count>=1) {
709 if (!gdbstub_read_byte(mem,ch))
710 return NULL;
711 buf = hex_byte_pack(buf, ch[0]);
712 }
713
714 *buf = 0;
715
716 return buf;
717 } /* end mem2hex() */
718
719 /*****************************************************************************/
720 /*
721 * convert the hex array pointed to by buf into binary to be placed in mem
722 * return a pointer to the character AFTER the last byte of buffer consumed
723 */
hex2mem(const char * buf,void * _mem,int count)724 static char *hex2mem(const char *buf, void *_mem, int count)
725 {
726 uint8_t *mem = _mem;
727 union {
728 uint32_t l;
729 uint16_t w;
730 uint8_t b[4];
731 } ch;
732
733 if ((u32)mem&1 && count>=1) {
734 ch.b[0] = hex(*buf++) << 4;
735 ch.b[0] |= hex(*buf++);
736 if (!gdbstub_write_byte(mem,ch.b[0]))
737 return NULL;
738 mem++;
739 count--;
740 }
741
742 if ((u32)mem&3 && count>=2) {
743 ch.b[0] = hex(*buf++) << 4;
744 ch.b[0] |= hex(*buf++);
745 ch.b[1] = hex(*buf++) << 4;
746 ch.b[1] |= hex(*buf++);
747 if (!gdbstub_write_word(mem,ch.w))
748 return NULL;
749 mem += 2;
750 count -= 2;
751 }
752
753 while (count>=4) {
754 ch.b[0] = hex(*buf++) << 4;
755 ch.b[0] |= hex(*buf++);
756 ch.b[1] = hex(*buf++) << 4;
757 ch.b[1] |= hex(*buf++);
758 ch.b[2] = hex(*buf++) << 4;
759 ch.b[2] |= hex(*buf++);
760 ch.b[3] = hex(*buf++) << 4;
761 ch.b[3] |= hex(*buf++);
762 if (!gdbstub_write_dword(mem,ch.l))
763 return NULL;
764 mem += 4;
765 count -= 4;
766 }
767
768 if (count>=2) {
769 ch.b[0] = hex(*buf++) << 4;
770 ch.b[0] |= hex(*buf++);
771 ch.b[1] = hex(*buf++) << 4;
772 ch.b[1] |= hex(*buf++);
773 if (!gdbstub_write_word(mem,ch.w))
774 return NULL;
775 mem += 2;
776 count -= 2;
777 }
778
779 if (count>=1) {
780 ch.b[0] = hex(*buf++) << 4;
781 ch.b[0] |= hex(*buf++);
782 if (!gdbstub_write_byte(mem,ch.b[0]))
783 return NULL;
784 }
785
786 return (char *) buf;
787 } /* end hex2mem() */
788
789 /*****************************************************************************/
790 /*
791 * This table contains the mapping between FRV TBR.TT exception codes,
792 * and signals, which are primarily what GDB understands. It also
793 * indicates which hardware traps we need to commandeer when
794 * initializing the stub.
795 */
796 static const struct brr_to_sig_map {
797 unsigned long brr_mask; /* BRR bitmask */
798 unsigned long tbr_tt; /* TBR.TT code (in BRR.EBTT) */
799 unsigned int signo; /* Signal that we map this into */
800 } brr_to_sig_map[] = {
801 { BRR_EB, TBR_TT_INSTR_ACC_ERROR, SIGSEGV },
802 { BRR_EB, TBR_TT_ILLEGAL_INSTR, SIGILL },
803 { BRR_EB, TBR_TT_PRIV_INSTR, SIGILL },
804 { BRR_EB, TBR_TT_MP_EXCEPTION, SIGFPE },
805 { BRR_EB, TBR_TT_DATA_ACC_ERROR, SIGSEGV },
806 { BRR_EB, TBR_TT_DATA_STR_ERROR, SIGSEGV },
807 { BRR_EB, TBR_TT_DIVISION_EXCEP, SIGFPE },
808 { BRR_EB, TBR_TT_COMPOUND_EXCEP, SIGSEGV },
809 { BRR_EB, TBR_TT_INTERRUPT_13, SIGALRM }, /* watchdog */
810 { BRR_EB, TBR_TT_INTERRUPT_14, SIGINT }, /* GDB serial */
811 { BRR_EB, TBR_TT_INTERRUPT_15, SIGQUIT }, /* NMI */
812 { BRR_CB, 0, SIGUSR1 },
813 { BRR_TB, 0, SIGUSR2 },
814 { BRR_DBNEx, 0, SIGTRAP },
815 { BRR_DBx, 0, SIGTRAP }, /* h/w watchpoint */
816 { BRR_IBx, 0, SIGTRAP }, /* h/w breakpoint */
817 { BRR_CBB, 0, SIGTRAP },
818 { BRR_SB, 0, SIGTRAP },
819 { BRR_ST, 0, SIGTRAP }, /* single step */
820 { 0, 0, SIGHUP } /* default */
821 };
822
823 /*****************************************************************************/
824 /*
825 * convert the FRV BRR register contents into a UNIX signal number
826 */
gdbstub_compute_signal(unsigned long brr)827 static inline int gdbstub_compute_signal(unsigned long brr)
828 {
829 const struct brr_to_sig_map *map;
830 unsigned long tbr = (brr & BRR_EBTT) >> 12;
831
832 for (map = brr_to_sig_map; map->brr_mask; map++)
833 if (map->brr_mask & brr)
834 if (!map->tbr_tt || map->tbr_tt == tbr)
835 break;
836
837 return map->signo;
838 } /* end gdbstub_compute_signal() */
839
840 /*****************************************************************************/
841 /*
842 * set a software breakpoint or a hardware breakpoint or watchpoint
843 */
gdbstub_set_breakpoint(unsigned long type,unsigned long addr,unsigned long len)844 static int gdbstub_set_breakpoint(unsigned long type, unsigned long addr, unsigned long len)
845 {
846 unsigned long tmp;
847 int bkpt, loop, xloop;
848
849 union {
850 struct {
851 unsigned long mask0, mask1;
852 };
853 uint8_t bytes[8];
854 } dbmr;
855
856 //gdbstub_printk("setbkpt(%ld,%08lx,%ld)\n", type, addr, len);
857
858 switch (type) {
859 /* set software breakpoint */
860 case 0:
861 if (addr & 3 || len > 7*4)
862 return -EINVAL;
863
864 for (bkpt = 255; bkpt >= 0; bkpt--)
865 if (!gdbstub_bkpts[bkpt].addr)
866 break;
867 if (bkpt < 0)
868 return -ENOSPC;
869
870 for (loop = 0; loop < len/4; loop++)
871 if (!gdbstub_read_dword(&((uint32_t *) addr)[loop],
872 &gdbstub_bkpts[bkpt].originsns[loop]))
873 return -EFAULT;
874
875 for (loop = 0; loop < len/4; loop++)
876 if (!gdbstub_write_dword(&((uint32_t *) addr)[loop],
877 BREAK_INSN)
878 ) {
879 /* need to undo the changes if possible */
880 for (xloop = 0; xloop < loop; xloop++)
881 gdbstub_write_dword(&((uint32_t *) addr)[xloop],
882 gdbstub_bkpts[bkpt].originsns[xloop]);
883 return -EFAULT;
884 }
885
886 gdbstub_bkpts[bkpt].addr = addr;
887 gdbstub_bkpts[bkpt].len = len;
888
889 #if 0
890 gdbstub_printk("Set BKPT[%02x]: %08lx #%d {%04x, %04x} -> { %04x, %04x }\n",
891 bkpt,
892 gdbstub_bkpts[bkpt].addr,
893 gdbstub_bkpts[bkpt].len,
894 gdbstub_bkpts[bkpt].originsns[0],
895 gdbstub_bkpts[bkpt].originsns[1],
896 ((uint32_t *) addr)[0],
897 ((uint32_t *) addr)[1]
898 );
899 #endif
900 return 0;
901
902 /* set hardware breakpoint */
903 case 1:
904 if (addr & 3 || len != 4)
905 return -EINVAL;
906
907 if (!(__debug_regs->dcr & DCR_IBE0)) {
908 //gdbstub_printk("set h/w break 0: %08lx\n", addr);
909 __debug_regs->dcr |= DCR_IBE0;
910 __debug_regs->ibar[0] = addr;
911 asm volatile("movgs %0,ibar0" : : "r"(addr));
912 return 0;
913 }
914
915 if (!(__debug_regs->dcr & DCR_IBE1)) {
916 //gdbstub_printk("set h/w break 1: %08lx\n", addr);
917 __debug_regs->dcr |= DCR_IBE1;
918 __debug_regs->ibar[1] = addr;
919 asm volatile("movgs %0,ibar1" : : "r"(addr));
920 return 0;
921 }
922
923 if (!(__debug_regs->dcr & DCR_IBE2)) {
924 //gdbstub_printk("set h/w break 2: %08lx\n", addr);
925 __debug_regs->dcr |= DCR_IBE2;
926 __debug_regs->ibar[2] = addr;
927 asm volatile("movgs %0,ibar2" : : "r"(addr));
928 return 0;
929 }
930
931 if (!(__debug_regs->dcr & DCR_IBE3)) {
932 //gdbstub_printk("set h/w break 3: %08lx\n", addr);
933 __debug_regs->dcr |= DCR_IBE3;
934 __debug_regs->ibar[3] = addr;
935 asm volatile("movgs %0,ibar3" : : "r"(addr));
936 return 0;
937 }
938
939 return -ENOSPC;
940
941 /* set data read/write/access watchpoint */
942 case 2:
943 case 3:
944 case 4:
945 if ((addr & ~7) != ((addr + len - 1) & ~7))
946 return -EINVAL;
947
948 tmp = addr & 7;
949
950 memset(dbmr.bytes, 0xff, sizeof(dbmr.bytes));
951 for (loop = 0; loop < len; loop++)
952 dbmr.bytes[tmp + loop] = 0;
953
954 addr &= ~7;
955
956 if (!(__debug_regs->dcr & (DCR_DRBE0|DCR_DWBE0))) {
957 //gdbstub_printk("set h/w watchpoint 0 type %ld: %08lx\n", type, addr);
958 tmp = type==2 ? DCR_DWBE0 : type==3 ? DCR_DRBE0 : DCR_DRBE0|DCR_DWBE0;
959
960 __debug_regs->dcr |= tmp;
961 __debug_regs->dbar[0] = addr;
962 __debug_regs->dbmr[0][0] = dbmr.mask0;
963 __debug_regs->dbmr[0][1] = dbmr.mask1;
964 __debug_regs->dbdr[0][0] = 0;
965 __debug_regs->dbdr[0][1] = 0;
966
967 asm volatile(" movgs %0,dbar0 \n"
968 " movgs %1,dbmr00 \n"
969 " movgs %2,dbmr01 \n"
970 " movgs gr0,dbdr00 \n"
971 " movgs gr0,dbdr01 \n"
972 : : "r"(addr), "r"(dbmr.mask0), "r"(dbmr.mask1));
973 return 0;
974 }
975
976 if (!(__debug_regs->dcr & (DCR_DRBE1|DCR_DWBE1))) {
977 //gdbstub_printk("set h/w watchpoint 1 type %ld: %08lx\n", type, addr);
978 tmp = type==2 ? DCR_DWBE1 : type==3 ? DCR_DRBE1 : DCR_DRBE1|DCR_DWBE1;
979
980 __debug_regs->dcr |= tmp;
981 __debug_regs->dbar[1] = addr;
982 __debug_regs->dbmr[1][0] = dbmr.mask0;
983 __debug_regs->dbmr[1][1] = dbmr.mask1;
984 __debug_regs->dbdr[1][0] = 0;
985 __debug_regs->dbdr[1][1] = 0;
986
987 asm volatile(" movgs %0,dbar1 \n"
988 " movgs %1,dbmr10 \n"
989 " movgs %2,dbmr11 \n"
990 " movgs gr0,dbdr10 \n"
991 " movgs gr0,dbdr11 \n"
992 : : "r"(addr), "r"(dbmr.mask0), "r"(dbmr.mask1));
993 return 0;
994 }
995
996 return -ENOSPC;
997
998 default:
999 return -EINVAL;
1000 }
1001
1002 } /* end gdbstub_set_breakpoint() */
1003
1004 /*****************************************************************************/
1005 /*
1006 * clear a breakpoint or watchpoint
1007 */
gdbstub_clear_breakpoint(unsigned long type,unsigned long addr,unsigned long len)1008 int gdbstub_clear_breakpoint(unsigned long type, unsigned long addr, unsigned long len)
1009 {
1010 unsigned long tmp;
1011 int bkpt, loop;
1012
1013 union {
1014 struct {
1015 unsigned long mask0, mask1;
1016 };
1017 uint8_t bytes[8];
1018 } dbmr;
1019
1020 //gdbstub_printk("clearbkpt(%ld,%08lx,%ld)\n", type, addr, len);
1021
1022 switch (type) {
1023 /* clear software breakpoint */
1024 case 0:
1025 for (bkpt = 255; bkpt >= 0; bkpt--)
1026 if (gdbstub_bkpts[bkpt].addr == addr && gdbstub_bkpts[bkpt].len == len)
1027 break;
1028 if (bkpt < 0)
1029 return -ENOENT;
1030
1031 gdbstub_bkpts[bkpt].addr = 0;
1032
1033 for (loop = 0; loop < len/4; loop++)
1034 if (!gdbstub_write_dword(&((uint32_t *) addr)[loop],
1035 gdbstub_bkpts[bkpt].originsns[loop]))
1036 return -EFAULT;
1037 return 0;
1038
1039 /* clear hardware breakpoint */
1040 case 1:
1041 if (addr & 3 || len != 4)
1042 return -EINVAL;
1043
1044 #define __get_ibar(X) ({ unsigned long x; asm volatile("movsg ibar"#X",%0" : "=r"(x)); x; })
1045
1046 if (__debug_regs->dcr & DCR_IBE0 && __get_ibar(0) == addr) {
1047 //gdbstub_printk("clear h/w break 0: %08lx\n", addr);
1048 __debug_regs->dcr &= ~DCR_IBE0;
1049 __debug_regs->ibar[0] = 0;
1050 asm volatile("movgs gr0,ibar0");
1051 return 0;
1052 }
1053
1054 if (__debug_regs->dcr & DCR_IBE1 && __get_ibar(1) == addr) {
1055 //gdbstub_printk("clear h/w break 1: %08lx\n", addr);
1056 __debug_regs->dcr &= ~DCR_IBE1;
1057 __debug_regs->ibar[1] = 0;
1058 asm volatile("movgs gr0,ibar1");
1059 return 0;
1060 }
1061
1062 if (__debug_regs->dcr & DCR_IBE2 && __get_ibar(2) == addr) {
1063 //gdbstub_printk("clear h/w break 2: %08lx\n", addr);
1064 __debug_regs->dcr &= ~DCR_IBE2;
1065 __debug_regs->ibar[2] = 0;
1066 asm volatile("movgs gr0,ibar2");
1067 return 0;
1068 }
1069
1070 if (__debug_regs->dcr & DCR_IBE3 && __get_ibar(3) == addr) {
1071 //gdbstub_printk("clear h/w break 3: %08lx\n", addr);
1072 __debug_regs->dcr &= ~DCR_IBE3;
1073 __debug_regs->ibar[3] = 0;
1074 asm volatile("movgs gr0,ibar3");
1075 return 0;
1076 }
1077
1078 return -EINVAL;
1079
1080 /* clear data read/write/access watchpoint */
1081 case 2:
1082 case 3:
1083 case 4:
1084 if ((addr & ~7) != ((addr + len - 1) & ~7))
1085 return -EINVAL;
1086
1087 tmp = addr & 7;
1088
1089 memset(dbmr.bytes, 0xff, sizeof(dbmr.bytes));
1090 for (loop = 0; loop < len; loop++)
1091 dbmr.bytes[tmp + loop] = 0;
1092
1093 addr &= ~7;
1094
1095 #define __get_dbar(X) ({ unsigned long x; asm volatile("movsg dbar"#X",%0" : "=r"(x)); x; })
1096 #define __get_dbmr0(X) ({ unsigned long x; asm volatile("movsg dbmr"#X"0,%0" : "=r"(x)); x; })
1097 #define __get_dbmr1(X) ({ unsigned long x; asm volatile("movsg dbmr"#X"1,%0" : "=r"(x)); x; })
1098
1099 /* consider DBAR 0 */
1100 tmp = type==2 ? DCR_DWBE0 : type==3 ? DCR_DRBE0 : DCR_DRBE0|DCR_DWBE0;
1101
1102 if ((__debug_regs->dcr & (DCR_DRBE0|DCR_DWBE0)) != tmp ||
1103 __get_dbar(0) != addr ||
1104 __get_dbmr0(0) != dbmr.mask0 ||
1105 __get_dbmr1(0) != dbmr.mask1)
1106 goto skip_dbar0;
1107
1108 //gdbstub_printk("clear h/w watchpoint 0 type %ld: %08lx\n", type, addr);
1109 __debug_regs->dcr &= ~(DCR_DRBE0|DCR_DWBE0);
1110 __debug_regs->dbar[0] = 0;
1111 __debug_regs->dbmr[0][0] = 0;
1112 __debug_regs->dbmr[0][1] = 0;
1113 __debug_regs->dbdr[0][0] = 0;
1114 __debug_regs->dbdr[0][1] = 0;
1115
1116 asm volatile(" movgs gr0,dbar0 \n"
1117 " movgs gr0,dbmr00 \n"
1118 " movgs gr0,dbmr01 \n"
1119 " movgs gr0,dbdr00 \n"
1120 " movgs gr0,dbdr01 \n");
1121 return 0;
1122
1123 skip_dbar0:
1124 /* consider DBAR 0 */
1125 tmp = type==2 ? DCR_DWBE1 : type==3 ? DCR_DRBE1 : DCR_DRBE1|DCR_DWBE1;
1126
1127 if ((__debug_regs->dcr & (DCR_DRBE1|DCR_DWBE1)) != tmp ||
1128 __get_dbar(1) != addr ||
1129 __get_dbmr0(1) != dbmr.mask0 ||
1130 __get_dbmr1(1) != dbmr.mask1)
1131 goto skip_dbar1;
1132
1133 //gdbstub_printk("clear h/w watchpoint 1 type %ld: %08lx\n", type, addr);
1134 __debug_regs->dcr &= ~(DCR_DRBE1|DCR_DWBE1);
1135 __debug_regs->dbar[1] = 0;
1136 __debug_regs->dbmr[1][0] = 0;
1137 __debug_regs->dbmr[1][1] = 0;
1138 __debug_regs->dbdr[1][0] = 0;
1139 __debug_regs->dbdr[1][1] = 0;
1140
1141 asm volatile(" movgs gr0,dbar1 \n"
1142 " movgs gr0,dbmr10 \n"
1143 " movgs gr0,dbmr11 \n"
1144 " movgs gr0,dbdr10 \n"
1145 " movgs gr0,dbdr11 \n");
1146 return 0;
1147
1148 skip_dbar1:
1149 return -ENOSPC;
1150
1151 default:
1152 return -EINVAL;
1153 }
1154 } /* end gdbstub_clear_breakpoint() */
1155
1156 /*****************************************************************************/
1157 /*
1158 * check a for an internal software breakpoint, and wind the PC back if necessary
1159 */
gdbstub_check_breakpoint(void)1160 static void gdbstub_check_breakpoint(void)
1161 {
1162 unsigned long addr = __debug_frame->pc - 4;
1163 int bkpt;
1164
1165 for (bkpt = 255; bkpt >= 0; bkpt--)
1166 if (gdbstub_bkpts[bkpt].addr == addr)
1167 break;
1168 if (bkpt >= 0)
1169 __debug_frame->pc = addr;
1170
1171 //gdbstub_printk("alter pc [%d] %08lx\n", bkpt, __debug_frame->pc);
1172
1173 } /* end gdbstub_check_breakpoint() */
1174
1175 /*****************************************************************************/
1176 /*
1177 *
1178 */
gdbstub_show_regs(void)1179 static void __maybe_unused gdbstub_show_regs(void)
1180 {
1181 unsigned long *reg;
1182 int loop;
1183
1184 gdbstub_printk("\n");
1185
1186 gdbstub_printk("Frame: @%p [%s]\n",
1187 __debug_frame,
1188 __debug_frame->psr & PSR_S ? "kernel" : "user");
1189
1190 reg = (unsigned long *) __debug_frame;
1191 for (loop = 0; loop < NR_PT_REGS; loop++) {
1192 printk("%s %08lx", regnames[loop + 0], reg[loop + 0]);
1193
1194 if (loop == NR_PT_REGS - 1 || loop % 5 == 4)
1195 printk("\n");
1196 else
1197 printk(" | ");
1198 }
1199
1200 gdbstub_printk("Process %s (pid: %d)\n", current->comm, current->pid);
1201 } /* end gdbstub_show_regs() */
1202
1203 /*****************************************************************************/
1204 /*
1205 * dump debugging regs
1206 */
gdbstub_dump_debugregs(void)1207 static void __maybe_unused gdbstub_dump_debugregs(void)
1208 {
1209 gdbstub_printk("DCR %08lx ", __debug_status.dcr);
1210 gdbstub_printk("BRR %08lx\n", __debug_status.brr);
1211
1212 gdbstub_printk("IBAR0 %08lx ", __get_ibar(0));
1213 gdbstub_printk("IBAR1 %08lx ", __get_ibar(1));
1214 gdbstub_printk("IBAR2 %08lx ", __get_ibar(2));
1215 gdbstub_printk("IBAR3 %08lx\n", __get_ibar(3));
1216
1217 gdbstub_printk("DBAR0 %08lx ", __get_dbar(0));
1218 gdbstub_printk("DBMR00 %08lx ", __get_dbmr0(0));
1219 gdbstub_printk("DBMR01 %08lx\n", __get_dbmr1(0));
1220
1221 gdbstub_printk("DBAR1 %08lx ", __get_dbar(1));
1222 gdbstub_printk("DBMR10 %08lx ", __get_dbmr0(1));
1223 gdbstub_printk("DBMR11 %08lx\n", __get_dbmr1(1));
1224
1225 gdbstub_printk("\n");
1226 } /* end gdbstub_dump_debugregs() */
1227
1228 /*****************************************************************************/
1229 /*
1230 * dump the MMU state into a structure so that it can be accessed with GDB
1231 */
gdbstub_get_mmu_state(void)1232 void gdbstub_get_mmu_state(void)
1233 {
1234 asm volatile("movsg hsr0,%0" : "=r"(__debug_mmu.regs.hsr0));
1235 asm volatile("movsg pcsr,%0" : "=r"(__debug_mmu.regs.pcsr));
1236 asm volatile("movsg esr0,%0" : "=r"(__debug_mmu.regs.esr0));
1237 asm volatile("movsg ear0,%0" : "=r"(__debug_mmu.regs.ear0));
1238 asm volatile("movsg epcr0,%0" : "=r"(__debug_mmu.regs.epcr0));
1239
1240 /* read the protection / SAT registers */
1241 __debug_mmu.iamr[0].L = __get_IAMLR(0);
1242 __debug_mmu.iamr[0].P = __get_IAMPR(0);
1243 __debug_mmu.iamr[1].L = __get_IAMLR(1);
1244 __debug_mmu.iamr[1].P = __get_IAMPR(1);
1245 __debug_mmu.iamr[2].L = __get_IAMLR(2);
1246 __debug_mmu.iamr[2].P = __get_IAMPR(2);
1247 __debug_mmu.iamr[3].L = __get_IAMLR(3);
1248 __debug_mmu.iamr[3].P = __get_IAMPR(3);
1249 __debug_mmu.iamr[4].L = __get_IAMLR(4);
1250 __debug_mmu.iamr[4].P = __get_IAMPR(4);
1251 __debug_mmu.iamr[5].L = __get_IAMLR(5);
1252 __debug_mmu.iamr[5].P = __get_IAMPR(5);
1253 __debug_mmu.iamr[6].L = __get_IAMLR(6);
1254 __debug_mmu.iamr[6].P = __get_IAMPR(6);
1255 __debug_mmu.iamr[7].L = __get_IAMLR(7);
1256 __debug_mmu.iamr[7].P = __get_IAMPR(7);
1257 __debug_mmu.iamr[8].L = __get_IAMLR(8);
1258 __debug_mmu.iamr[8].P = __get_IAMPR(8);
1259 __debug_mmu.iamr[9].L = __get_IAMLR(9);
1260 __debug_mmu.iamr[9].P = __get_IAMPR(9);
1261 __debug_mmu.iamr[10].L = __get_IAMLR(10);
1262 __debug_mmu.iamr[10].P = __get_IAMPR(10);
1263 __debug_mmu.iamr[11].L = __get_IAMLR(11);
1264 __debug_mmu.iamr[11].P = __get_IAMPR(11);
1265 __debug_mmu.iamr[12].L = __get_IAMLR(12);
1266 __debug_mmu.iamr[12].P = __get_IAMPR(12);
1267 __debug_mmu.iamr[13].L = __get_IAMLR(13);
1268 __debug_mmu.iamr[13].P = __get_IAMPR(13);
1269 __debug_mmu.iamr[14].L = __get_IAMLR(14);
1270 __debug_mmu.iamr[14].P = __get_IAMPR(14);
1271 __debug_mmu.iamr[15].L = __get_IAMLR(15);
1272 __debug_mmu.iamr[15].P = __get_IAMPR(15);
1273
1274 __debug_mmu.damr[0].L = __get_DAMLR(0);
1275 __debug_mmu.damr[0].P = __get_DAMPR(0);
1276 __debug_mmu.damr[1].L = __get_DAMLR(1);
1277 __debug_mmu.damr[1].P = __get_DAMPR(1);
1278 __debug_mmu.damr[2].L = __get_DAMLR(2);
1279 __debug_mmu.damr[2].P = __get_DAMPR(2);
1280 __debug_mmu.damr[3].L = __get_DAMLR(3);
1281 __debug_mmu.damr[3].P = __get_DAMPR(3);
1282 __debug_mmu.damr[4].L = __get_DAMLR(4);
1283 __debug_mmu.damr[4].P = __get_DAMPR(4);
1284 __debug_mmu.damr[5].L = __get_DAMLR(5);
1285 __debug_mmu.damr[5].P = __get_DAMPR(5);
1286 __debug_mmu.damr[6].L = __get_DAMLR(6);
1287 __debug_mmu.damr[6].P = __get_DAMPR(6);
1288 __debug_mmu.damr[7].L = __get_DAMLR(7);
1289 __debug_mmu.damr[7].P = __get_DAMPR(7);
1290 __debug_mmu.damr[8].L = __get_DAMLR(8);
1291 __debug_mmu.damr[8].P = __get_DAMPR(8);
1292 __debug_mmu.damr[9].L = __get_DAMLR(9);
1293 __debug_mmu.damr[9].P = __get_DAMPR(9);
1294 __debug_mmu.damr[10].L = __get_DAMLR(10);
1295 __debug_mmu.damr[10].P = __get_DAMPR(10);
1296 __debug_mmu.damr[11].L = __get_DAMLR(11);
1297 __debug_mmu.damr[11].P = __get_DAMPR(11);
1298 __debug_mmu.damr[12].L = __get_DAMLR(12);
1299 __debug_mmu.damr[12].P = __get_DAMPR(12);
1300 __debug_mmu.damr[13].L = __get_DAMLR(13);
1301 __debug_mmu.damr[13].P = __get_DAMPR(13);
1302 __debug_mmu.damr[14].L = __get_DAMLR(14);
1303 __debug_mmu.damr[14].P = __get_DAMPR(14);
1304 __debug_mmu.damr[15].L = __get_DAMLR(15);
1305 __debug_mmu.damr[15].P = __get_DAMPR(15);
1306
1307 #ifdef CONFIG_MMU
1308 do {
1309 /* read the DAT entries from the TLB */
1310 struct __debug_amr *p;
1311 int loop;
1312
1313 asm volatile("movsg tplr,%0" : "=r"(__debug_mmu.regs.tplr));
1314 asm volatile("movsg tppr,%0" : "=r"(__debug_mmu.regs.tppr));
1315 asm volatile("movsg tpxr,%0" : "=r"(__debug_mmu.regs.tpxr));
1316 asm volatile("movsg cxnr,%0" : "=r"(__debug_mmu.regs.cxnr));
1317
1318 p = __debug_mmu.tlb;
1319
1320 /* way 0 */
1321 asm volatile("movgs %0,tpxr" :: "r"(0 << TPXR_WAY_SHIFT));
1322 for (loop = 0; loop < 64; loop++) {
1323 asm volatile("tlbpr %0,gr0,#1,#0" :: "r"(loop << PAGE_SHIFT));
1324 asm volatile("movsg tplr,%0" : "=r"(p->L));
1325 asm volatile("movsg tppr,%0" : "=r"(p->P));
1326 p++;
1327 }
1328
1329 /* way 1 */
1330 asm volatile("movgs %0,tpxr" :: "r"(1 << TPXR_WAY_SHIFT));
1331 for (loop = 0; loop < 64; loop++) {
1332 asm volatile("tlbpr %0,gr0,#1,#0" :: "r"(loop << PAGE_SHIFT));
1333 asm volatile("movsg tplr,%0" : "=r"(p->L));
1334 asm volatile("movsg tppr,%0" : "=r"(p->P));
1335 p++;
1336 }
1337
1338 asm volatile("movgs %0,tplr" :: "r"(__debug_mmu.regs.tplr));
1339 asm volatile("movgs %0,tppr" :: "r"(__debug_mmu.regs.tppr));
1340 asm volatile("movgs %0,tpxr" :: "r"(__debug_mmu.regs.tpxr));
1341 } while(0);
1342 #endif
1343
1344 } /* end gdbstub_get_mmu_state() */
1345
1346 /*
1347 * handle general query commands of the form 'qXXXXX'
1348 */
gdbstub_handle_query(void)1349 static void gdbstub_handle_query(void)
1350 {
1351 if (strcmp(input_buffer, "qAttached") == 0) {
1352 /* return current thread ID */
1353 sprintf(output_buffer, "1");
1354 return;
1355 }
1356
1357 if (strcmp(input_buffer, "qC") == 0) {
1358 /* return current thread ID */
1359 sprintf(output_buffer, "QC 0");
1360 return;
1361 }
1362
1363 if (strcmp(input_buffer, "qOffsets") == 0) {
1364 /* return relocation offset of text and data segments */
1365 sprintf(output_buffer, "Text=0;Data=0;Bss=0");
1366 return;
1367 }
1368
1369 if (strcmp(input_buffer, "qSymbol::") == 0) {
1370 sprintf(output_buffer, "OK");
1371 return;
1372 }
1373
1374 if (strcmp(input_buffer, "qSupported") == 0) {
1375 /* query of supported features */
1376 sprintf(output_buffer, "PacketSize=%u;ReverseContinue-;ReverseStep-",
1377 sizeof(input_buffer));
1378 return;
1379 }
1380
1381 gdbstub_strcpy(output_buffer,"E01");
1382 }
1383
1384 /*****************************************************************************/
1385 /*
1386 * handle event interception and GDB remote protocol processing
1387 * - on entry:
1388 * PSR.ET==0, PSR.S==1 and the CPU is in debug mode
1389 * __debug_frame points to the saved registers
1390 * __frame points to the kernel mode exception frame, if it was in kernel
1391 * mode when the break happened
1392 */
gdbstub(int sigval)1393 void gdbstub(int sigval)
1394 {
1395 unsigned long addr, length, loop, dbar, temp, temp2, temp3;
1396 uint32_t zero;
1397 char *ptr;
1398 int flush_cache = 0;
1399
1400 LEDS(0x5000);
1401
1402 if (sigval < 0) {
1403 #ifndef CONFIG_GDBSTUB_IMMEDIATE
1404 /* return immediately if GDB immediate activation option not set */
1405 return;
1406 #else
1407 sigval = SIGINT;
1408 #endif
1409 }
1410
1411 save_user_regs(&__debug_frame0->uc);
1412
1413 #if 0
1414 gdbstub_printk("--> gdbstub() %08x %p %08x %08x\n",
1415 __debug_frame->pc,
1416 __debug_frame,
1417 __debug_regs->brr,
1418 __debug_regs->bpsr);
1419 // gdbstub_show_regs();
1420 #endif
1421
1422 LEDS(0x5001);
1423
1424 /* if we were interrupted by input on the serial gdbstub serial port,
1425 * restore the context prior to the interrupt so that we return to that
1426 * directly
1427 */
1428 temp = (unsigned long) __entry_kerneltrap_table;
1429 temp2 = (unsigned long) __entry_usertrap_table;
1430 temp3 = __debug_frame->pc & ~15;
1431
1432 if (temp3 == temp + TBR_TT_INTERRUPT_15 ||
1433 temp3 == temp2 + TBR_TT_INTERRUPT_15
1434 ) {
1435 asm volatile("movsg pcsr,%0" : "=r"(__debug_frame->pc));
1436 __debug_frame->psr |= PSR_ET;
1437 __debug_frame->psr &= ~PSR_S;
1438 if (__debug_frame->psr & PSR_PS)
1439 __debug_frame->psr |= PSR_S;
1440 __debug_status.brr = (__debug_frame->tbr & TBR_TT) << 12;
1441 __debug_status.brr |= BRR_EB;
1442 sigval = SIGINT;
1443 }
1444
1445 /* handle the decrement timer going off (FR451 only) */
1446 if (temp3 == temp + TBR_TT_DECREMENT_TIMER ||
1447 temp3 == temp2 + TBR_TT_DECREMENT_TIMER
1448 ) {
1449 asm volatile("movgs %0,timerd" :: "r"(10000000));
1450 asm volatile("movsg pcsr,%0" : "=r"(__debug_frame->pc));
1451 __debug_frame->psr |= PSR_ET;
1452 __debug_frame->psr &= ~PSR_S;
1453 if (__debug_frame->psr & PSR_PS)
1454 __debug_frame->psr |= PSR_S;
1455 __debug_status.brr = (__debug_frame->tbr & TBR_TT) << 12;
1456 __debug_status.brr |= BRR_EB;
1457 sigval = SIGXCPU;
1458 }
1459
1460 LEDS(0x5002);
1461
1462 /* after a BREAK insn, the PC lands on the far side of it */
1463 if (__debug_status.brr & BRR_SB)
1464 gdbstub_check_breakpoint();
1465
1466 LEDS(0x5003);
1467
1468 /* handle attempts to write console data via GDB "O" commands */
1469 if (__debug_frame->pc == (unsigned long) gdbstub_console_write + 4) {
1470 __gdbstub_console_write((struct console *) __debug_frame->gr8,
1471 (const char *) __debug_frame->gr9,
1472 (unsigned) __debug_frame->gr10);
1473 goto done;
1474 }
1475
1476 if (gdbstub_rx_unget) {
1477 sigval = SIGINT;
1478 goto packet_waiting;
1479 }
1480
1481 if (!sigval)
1482 sigval = gdbstub_compute_signal(__debug_status.brr);
1483
1484 LEDS(0x5004);
1485
1486 /* send a message to the debugger's user saying what happened if it may
1487 * not be clear cut (we can't map exceptions onto signals properly)
1488 */
1489 if (sigval != SIGINT && sigval != SIGTRAP && sigval != SIGILL) {
1490 static const char title[] = "Break ";
1491 static const char crlf[] = "\r\n";
1492 unsigned long brr = __debug_status.brr;
1493 char hx;
1494
1495 ptr = output_buffer;
1496 *ptr++ = 'O';
1497 ptr = mem2hex(title, ptr, sizeof(title) - 1,0);
1498
1499 hx = hex_asc_hi(brr >> 24);
1500 ptr = hex_byte_pack(ptr, hx);
1501 hx = hex_asc_lo(brr >> 24);
1502 ptr = hex_byte_pack(ptr, hx);
1503 hx = hex_asc_hi(brr >> 16);
1504 ptr = hex_byte_pack(ptr, hx);
1505 hx = hex_asc_lo(brr >> 16);
1506 ptr = hex_byte_pack(ptr, hx);
1507 hx = hex_asc_hi(brr >> 8);
1508 ptr = hex_byte_pack(ptr, hx);
1509 hx = hex_asc_lo(brr >> 8);
1510 ptr = hex_byte_pack(ptr, hx);
1511 hx = hex_asc_hi(brr);
1512 ptr = hex_byte_pack(ptr, hx);
1513 hx = hex_asc_lo(brr);
1514 ptr = hex_byte_pack(ptr, hx);
1515
1516 ptr = mem2hex(crlf, ptr, sizeof(crlf) - 1, 0);
1517 *ptr = 0;
1518 gdbstub_send_packet(output_buffer); /* send it off... */
1519 }
1520
1521 LEDS(0x5005);
1522
1523 /* tell the debugger that an exception has occurred */
1524 ptr = output_buffer;
1525
1526 /* Send trap type (converted to signal) */
1527 *ptr++ = 'T';
1528 ptr = hex_byte_pack(ptr, sigval);
1529
1530 /* Send Error PC */
1531 ptr = hex_byte_pack(ptr, GDB_REG_PC);
1532 *ptr++ = ':';
1533 ptr = mem2hex(&__debug_frame->pc, ptr, 4, 0);
1534 *ptr++ = ';';
1535
1536 /*
1537 * Send frame pointer
1538 */
1539 ptr = hex_byte_pack(ptr, GDB_REG_FP);
1540 *ptr++ = ':';
1541 ptr = mem2hex(&__debug_frame->fp, ptr, 4, 0);
1542 *ptr++ = ';';
1543
1544 /*
1545 * Send stack pointer
1546 */
1547 ptr = hex_byte_pack(ptr, GDB_REG_SP);
1548 *ptr++ = ':';
1549 ptr = mem2hex(&__debug_frame->sp, ptr, 4, 0);
1550 *ptr++ = ';';
1551
1552 *ptr++ = 0;
1553 gdbstub_send_packet(output_buffer); /* send it off... */
1554
1555 LEDS(0x5006);
1556
1557 packet_waiting:
1558 gdbstub_get_mmu_state();
1559
1560 /* wait for input from remote GDB */
1561 while (1) {
1562 output_buffer[0] = 0;
1563
1564 LEDS(0x5007);
1565 gdbstub_recv_packet(input_buffer);
1566 LEDS(0x5600 | input_buffer[0]);
1567
1568 switch (input_buffer[0]) {
1569 /* request repeat of last signal number */
1570 case '?':
1571 output_buffer[0] = 'S';
1572 output_buffer[1] = hex_asc_hi(sigval);
1573 output_buffer[2] = hex_asc_lo(sigval);
1574 output_buffer[3] = 0;
1575 break;
1576
1577 case 'd':
1578 /* toggle debug flag */
1579 break;
1580
1581 /* return the value of the CPU registers
1582 * - GR0, GR1, GR2, GR3, GR4, GR5, GR6, GR7,
1583 * - GR8, GR9, GR10, GR11, GR12, GR13, GR14, GR15,
1584 * - GR16, GR17, GR18, GR19, GR20, GR21, GR22, GR23,
1585 * - GR24, GR25, GR26, GR27, GR28, GR29, GR30, GR31,
1586 * - GR32, GR33, GR34, GR35, GR36, GR37, GR38, GR39,
1587 * - GR40, GR41, GR42, GR43, GR44, GR45, GR46, GR47,
1588 * - GR48, GR49, GR50, GR51, GR52, GR53, GR54, GR55,
1589 * - GR56, GR57, GR58, GR59, GR60, GR61, GR62, GR63,
1590 * - FP0, FP1, FP2, FP3, FP4, FP5, FP6, FP7,
1591 * - FP8, FP9, FP10, FP11, FP12, FP13, FP14, FP15,
1592 * - FP16, FP17, FP18, FP19, FP20, FP21, FP22, FP23,
1593 * - FP24, FP25, FP26, FP27, FP28, FP29, FP30, FP31,
1594 * - FP32, FP33, FP34, FP35, FP36, FP37, FP38, FP39,
1595 * - FP40, FP41, FP42, FP43, FP44, FP45, FP46, FP47,
1596 * - FP48, FP49, FP50, FP51, FP52, FP53, FP54, FP55,
1597 * - FP56, FP57, FP58, FP59, FP60, FP61, FP62, FP63,
1598 * - PC, PSR, CCR, CCCR,
1599 * - _X132, _X133, _X134
1600 * - TBR, BRR, DBAR0, DBAR1, DBAR2, DBAR3,
1601 * - _X141, _X142, _X143, _X144,
1602 * - LR, LCR
1603 */
1604 case 'g':
1605 zero = 0;
1606 ptr = output_buffer;
1607
1608 /* deal with GR0, GR1-GR27, GR28-GR31, GR32-GR63 */
1609 ptr = mem2hex(&zero, ptr, 4, 0);
1610
1611 for (loop = 1; loop <= 27; loop++)
1612 ptr = mem2hex(&__debug_user_context->i.gr[loop], ptr, 4, 0);
1613 temp = (unsigned long) __frame;
1614 ptr = mem2hex(&temp, ptr, 4, 0);
1615 ptr = mem2hex(&__debug_user_context->i.gr[29], ptr, 4, 0);
1616 ptr = mem2hex(&__debug_user_context->i.gr[30], ptr, 4, 0);
1617 #ifdef CONFIG_MMU
1618 ptr = mem2hex(&__debug_user_context->i.gr[31], ptr, 4, 0);
1619 #else
1620 temp = (unsigned long) __debug_frame;
1621 ptr = mem2hex(&temp, ptr, 4, 0);
1622 #endif
1623
1624 for (loop = 32; loop <= 63; loop++)
1625 ptr = mem2hex(&__debug_user_context->i.gr[loop], ptr, 4, 0);
1626
1627 /* deal with FR0-FR63 */
1628 for (loop = 0; loop <= 63; loop++)
1629 ptr = mem2hex(&__debug_user_context->f.fr[loop], ptr, 4, 0);
1630
1631 /* deal with special registers */
1632 ptr = mem2hex(&__debug_frame->pc, ptr, 4, 0);
1633 ptr = mem2hex(&__debug_frame->psr, ptr, 4, 0);
1634 ptr = mem2hex(&__debug_frame->ccr, ptr, 4, 0);
1635 ptr = mem2hex(&__debug_frame->cccr, ptr, 4, 0);
1636 ptr = mem2hex(&zero, ptr, 4, 0);
1637 ptr = mem2hex(&zero, ptr, 4, 0);
1638 ptr = mem2hex(&zero, ptr, 4, 0);
1639 ptr = mem2hex(&__debug_frame->tbr, ptr, 4, 0);
1640 ptr = mem2hex(&__debug_status.brr , ptr, 4, 0);
1641
1642 asm volatile("movsg dbar0,%0" : "=r"(dbar));
1643 ptr = mem2hex(&dbar, ptr, 4, 0);
1644 asm volatile("movsg dbar1,%0" : "=r"(dbar));
1645 ptr = mem2hex(&dbar, ptr, 4, 0);
1646 asm volatile("movsg dbar2,%0" : "=r"(dbar));
1647 ptr = mem2hex(&dbar, ptr, 4, 0);
1648 asm volatile("movsg dbar3,%0" : "=r"(dbar));
1649 ptr = mem2hex(&dbar, ptr, 4, 0);
1650
1651 asm volatile("movsg scr0,%0" : "=r"(dbar));
1652 ptr = mem2hex(&dbar, ptr, 4, 0);
1653 asm volatile("movsg scr1,%0" : "=r"(dbar));
1654 ptr = mem2hex(&dbar, ptr, 4, 0);
1655 asm volatile("movsg scr2,%0" : "=r"(dbar));
1656 ptr = mem2hex(&dbar, ptr, 4, 0);
1657 asm volatile("movsg scr3,%0" : "=r"(dbar));
1658 ptr = mem2hex(&dbar, ptr, 4, 0);
1659
1660 ptr = mem2hex(&__debug_frame->lr, ptr, 4, 0);
1661 ptr = mem2hex(&__debug_frame->lcr, ptr, 4, 0);
1662
1663 ptr = mem2hex(&__debug_frame->iacc0, ptr, 8, 0);
1664
1665 ptr = mem2hex(&__debug_user_context->f.fsr[0], ptr, 4, 0);
1666
1667 for (loop = 0; loop <= 7; loop++)
1668 ptr = mem2hex(&__debug_user_context->f.acc[loop], ptr, 4, 0);
1669
1670 ptr = mem2hex(&__debug_user_context->f.accg, ptr, 8, 0);
1671
1672 for (loop = 0; loop <= 1; loop++)
1673 ptr = mem2hex(&__debug_user_context->f.msr[loop], ptr, 4, 0);
1674
1675 ptr = mem2hex(&__debug_frame->gner0, ptr, 4, 0);
1676 ptr = mem2hex(&__debug_frame->gner1, ptr, 4, 0);
1677
1678 ptr = mem2hex(&__debug_user_context->f.fner[0], ptr, 4, 0);
1679 ptr = mem2hex(&__debug_user_context->f.fner[1], ptr, 4, 0);
1680
1681 break;
1682
1683 /* set the values of the CPU registers */
1684 case 'G':
1685 ptr = &input_buffer[1];
1686
1687 /* deal with GR0, GR1-GR27, GR28-GR31, GR32-GR63 */
1688 ptr = hex2mem(ptr, &temp, 4);
1689
1690 for (loop = 1; loop <= 27; loop++)
1691 ptr = hex2mem(ptr, &__debug_user_context->i.gr[loop], 4);
1692
1693 ptr = hex2mem(ptr, &temp, 4);
1694 __frame = (struct pt_regs *) temp;
1695 ptr = hex2mem(ptr, &__debug_frame->gr29, 4);
1696 ptr = hex2mem(ptr, &__debug_frame->gr30, 4);
1697 #ifdef CONFIG_MMU
1698 ptr = hex2mem(ptr, &__debug_frame->gr31, 4);
1699 #else
1700 ptr = hex2mem(ptr, &temp, 4);
1701 #endif
1702
1703 for (loop = 32; loop <= 63; loop++)
1704 ptr = hex2mem(ptr, &__debug_user_context->i.gr[loop], 4);
1705
1706 /* deal with FR0-FR63 */
1707 for (loop = 0; loop <= 63; loop++)
1708 ptr = mem2hex(&__debug_user_context->f.fr[loop], ptr, 4, 0);
1709
1710 /* deal with special registers */
1711 ptr = hex2mem(ptr, &__debug_frame->pc, 4);
1712 ptr = hex2mem(ptr, &__debug_frame->psr, 4);
1713 ptr = hex2mem(ptr, &__debug_frame->ccr, 4);
1714 ptr = hex2mem(ptr, &__debug_frame->cccr,4);
1715
1716 for (loop = 132; loop <= 140; loop++)
1717 ptr = hex2mem(ptr, &temp, 4);
1718
1719 ptr = hex2mem(ptr, &temp, 4);
1720 asm volatile("movgs %0,scr0" :: "r"(temp));
1721 ptr = hex2mem(ptr, &temp, 4);
1722 asm volatile("movgs %0,scr1" :: "r"(temp));
1723 ptr = hex2mem(ptr, &temp, 4);
1724 asm volatile("movgs %0,scr2" :: "r"(temp));
1725 ptr = hex2mem(ptr, &temp, 4);
1726 asm volatile("movgs %0,scr3" :: "r"(temp));
1727
1728 ptr = hex2mem(ptr, &__debug_frame->lr, 4);
1729 ptr = hex2mem(ptr, &__debug_frame->lcr, 4);
1730
1731 ptr = hex2mem(ptr, &__debug_frame->iacc0, 8);
1732
1733 ptr = hex2mem(ptr, &__debug_user_context->f.fsr[0], 4);
1734
1735 for (loop = 0; loop <= 7; loop++)
1736 ptr = hex2mem(ptr, &__debug_user_context->f.acc[loop], 4);
1737
1738 ptr = hex2mem(ptr, &__debug_user_context->f.accg, 8);
1739
1740 for (loop = 0; loop <= 1; loop++)
1741 ptr = hex2mem(ptr, &__debug_user_context->f.msr[loop], 4);
1742
1743 ptr = hex2mem(ptr, &__debug_frame->gner0, 4);
1744 ptr = hex2mem(ptr, &__debug_frame->gner1, 4);
1745
1746 ptr = hex2mem(ptr, &__debug_user_context->f.fner[0], 4);
1747 ptr = hex2mem(ptr, &__debug_user_context->f.fner[1], 4);
1748
1749 gdbstub_strcpy(output_buffer,"OK");
1750 break;
1751
1752 /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */
1753 case 'm':
1754 ptr = &input_buffer[1];
1755
1756 if (hexToInt(&ptr, &addr) &&
1757 *ptr++ == ',' &&
1758 hexToInt(&ptr, &length)
1759 ) {
1760 if (mem2hex((char *)addr, output_buffer, length, 1))
1761 break;
1762 gdbstub_strcpy (output_buffer, "E03");
1763 }
1764 else {
1765 gdbstub_strcpy(output_buffer,"E01");
1766 }
1767 break;
1768
1769 /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */
1770 case 'M':
1771 ptr = &input_buffer[1];
1772
1773 if (hexToInt(&ptr, &addr) &&
1774 *ptr++ == ',' &&
1775 hexToInt(&ptr, &length) &&
1776 *ptr++ == ':'
1777 ) {
1778 if (hex2mem(ptr, (char *)addr, length)) {
1779 gdbstub_strcpy(output_buffer, "OK");
1780 }
1781 else {
1782 gdbstub_strcpy(output_buffer, "E03");
1783 }
1784 }
1785 else
1786 gdbstub_strcpy(output_buffer, "E02");
1787
1788 flush_cache = 1;
1789 break;
1790
1791 /* pNN: Read value of reg N and return it */
1792 case 'p':
1793 /* return no value, indicating that we don't support
1794 * this command and that gdb should use 'g' instead */
1795 break;
1796
1797 /* PNN,=RRRRRRRR: Write value R to reg N return OK */
1798 case 'P':
1799 ptr = &input_buffer[1];
1800
1801 if (!hexToInt(&ptr, &addr) ||
1802 *ptr++ != '=' ||
1803 !hexToInt(&ptr, &temp)
1804 ) {
1805 gdbstub_strcpy(output_buffer, "E01");
1806 break;
1807 }
1808
1809 temp2 = 1;
1810 switch (addr) {
1811 case GDB_REG_GR(0):
1812 break;
1813 case GDB_REG_GR(1) ... GDB_REG_GR(63):
1814 __debug_user_context->i.gr[addr - GDB_REG_GR(0)] = temp;
1815 break;
1816 case GDB_REG_FR(0) ... GDB_REG_FR(63):
1817 __debug_user_context->f.fr[addr - GDB_REG_FR(0)] = temp;
1818 break;
1819 case GDB_REG_PC:
1820 __debug_user_context->i.pc = temp;
1821 break;
1822 case GDB_REG_PSR:
1823 __debug_user_context->i.psr = temp;
1824 break;
1825 case GDB_REG_CCR:
1826 __debug_user_context->i.ccr = temp;
1827 break;
1828 case GDB_REG_CCCR:
1829 __debug_user_context->i.cccr = temp;
1830 break;
1831 case GDB_REG_BRR:
1832 __debug_status.brr = temp;
1833 break;
1834 case GDB_REG_LR:
1835 __debug_user_context->i.lr = temp;
1836 break;
1837 case GDB_REG_LCR:
1838 __debug_user_context->i.lcr = temp;
1839 break;
1840 case GDB_REG_FSR0:
1841 __debug_user_context->f.fsr[0] = temp;
1842 break;
1843 case GDB_REG_ACC(0) ... GDB_REG_ACC(7):
1844 __debug_user_context->f.acc[addr - GDB_REG_ACC(0)] = temp;
1845 break;
1846 case GDB_REG_ACCG(0):
1847 *(uint32_t *) &__debug_user_context->f.accg[0] = temp;
1848 break;
1849 case GDB_REG_ACCG(4):
1850 *(uint32_t *) &__debug_user_context->f.accg[4] = temp;
1851 break;
1852 case GDB_REG_MSR(0) ... GDB_REG_MSR(1):
1853 __debug_user_context->f.msr[addr - GDB_REG_MSR(0)] = temp;
1854 break;
1855 case GDB_REG_GNER(0) ... GDB_REG_GNER(1):
1856 __debug_user_context->i.gner[addr - GDB_REG_GNER(0)] = temp;
1857 break;
1858 case GDB_REG_FNER(0) ... GDB_REG_FNER(1):
1859 __debug_user_context->f.fner[addr - GDB_REG_FNER(0)] = temp;
1860 break;
1861 default:
1862 temp2 = 0;
1863 break;
1864 }
1865
1866 if (temp2) {
1867 gdbstub_strcpy(output_buffer, "OK");
1868 }
1869 else {
1870 gdbstub_strcpy(output_buffer, "E02");
1871 }
1872 break;
1873
1874 /* cAA..AA Continue at address AA..AA(optional) */
1875 case 'c':
1876 /* try to read optional parameter, pc unchanged if no parm */
1877 ptr = &input_buffer[1];
1878 if (hexToInt(&ptr, &addr))
1879 __debug_frame->pc = addr;
1880 goto done;
1881
1882 /* kill the program */
1883 case 'k' :
1884 goto done; /* just continue */
1885
1886 /* detach */
1887 case 'D':
1888 gdbstub_strcpy(output_buffer, "OK");
1889 break;
1890
1891 /* reset the whole machine (FIXME: system dependent) */
1892 case 'r':
1893 break;
1894
1895
1896 /* step to next instruction */
1897 case 's':
1898 __debug_regs->dcr |= DCR_SE;
1899 __debug_status.dcr |= DCR_SE;
1900 goto done;
1901
1902 /* extended command */
1903 case 'v':
1904 if (strcmp(input_buffer, "vCont?") == 0) {
1905 output_buffer[0] = 0;
1906 break;
1907 }
1908 goto unsupported_cmd;
1909
1910 /* set baud rate (bBB) */
1911 case 'b':
1912 ptr = &input_buffer[1];
1913 if (!hexToInt(&ptr, &temp)) {
1914 gdbstub_strcpy(output_buffer,"B01");
1915 break;
1916 }
1917
1918 if (temp) {
1919 /* ack before changing speed */
1920 gdbstub_send_packet("OK");
1921 gdbstub_set_baud(temp);
1922 }
1923 break;
1924
1925 /* set breakpoint */
1926 case 'Z':
1927 ptr = &input_buffer[1];
1928
1929 if (!hexToInt(&ptr,&temp) || *ptr++ != ',' ||
1930 !hexToInt(&ptr,&addr) || *ptr++ != ',' ||
1931 !hexToInt(&ptr,&length)
1932 ) {
1933 gdbstub_strcpy(output_buffer,"E01");
1934 break;
1935 }
1936
1937 if (temp >= 5) {
1938 gdbstub_strcpy(output_buffer,"E03");
1939 break;
1940 }
1941
1942 if (gdbstub_set_breakpoint(temp, addr, length) < 0) {
1943 gdbstub_strcpy(output_buffer,"E03");
1944 break;
1945 }
1946
1947 if (temp == 0)
1948 flush_cache = 1; /* soft bkpt by modified memory */
1949
1950 gdbstub_strcpy(output_buffer,"OK");
1951 break;
1952
1953 /* clear breakpoint */
1954 case 'z':
1955 ptr = &input_buffer[1];
1956
1957 if (!hexToInt(&ptr,&temp) || *ptr++ != ',' ||
1958 !hexToInt(&ptr,&addr) || *ptr++ != ',' ||
1959 !hexToInt(&ptr,&length)
1960 ) {
1961 gdbstub_strcpy(output_buffer,"E01");
1962 break;
1963 }
1964
1965 if (temp >= 5) {
1966 gdbstub_strcpy(output_buffer,"E03");
1967 break;
1968 }
1969
1970 if (gdbstub_clear_breakpoint(temp, addr, length) < 0) {
1971 gdbstub_strcpy(output_buffer,"E03");
1972 break;
1973 }
1974
1975 if (temp == 0)
1976 flush_cache = 1; /* soft bkpt by modified memory */
1977
1978 gdbstub_strcpy(output_buffer,"OK");
1979 break;
1980
1981 /* Thread-setting packet */
1982 case 'H':
1983 gdbstub_strcpy(output_buffer, "OK");
1984 break;
1985
1986 case 'q':
1987 gdbstub_handle_query();
1988 break;
1989
1990 default:
1991 unsupported_cmd:
1992 gdbstub_proto("### GDB Unsupported Cmd '%s'\n",input_buffer);
1993 gdbstub_strcpy(output_buffer,"E01");
1994 break;
1995 }
1996
1997 /* reply to the request */
1998 LEDS(0x5009);
1999 gdbstub_send_packet(output_buffer);
2000 }
2001
2002 done:
2003 restore_user_regs(&__debug_frame0->uc);
2004
2005 //gdbstub_dump_debugregs();
2006 //gdbstub_printk("<-- gdbstub() %08x\n", __debug_frame->pc);
2007
2008 /* need to flush the instruction cache before resuming, as we may have
2009 * deposited a breakpoint, and the icache probably has no way of
2010 * knowing that a data ref to some location may have changed something
2011 * that is in the instruction cache. NB: We flush both caches, just to
2012 * be sure...
2013 */
2014
2015 /* note: flushing the icache will clobber EAR0 on the FR451 */
2016 if (flush_cache)
2017 gdbstub_purge_cache();
2018
2019 LEDS(0x5666);
2020
2021 } /* end gdbstub() */
2022
2023 /*****************************************************************************/
2024 /*
2025 * initialise the GDB stub
2026 */
gdbstub_init(void)2027 void __init gdbstub_init(void)
2028 {
2029 #ifdef CONFIG_GDBSTUB_IMMEDIATE
2030 unsigned char ch;
2031 int ret;
2032 #endif
2033
2034 gdbstub_printk("%s", gdbstub_banner);
2035
2036 gdbstub_io_init();
2037
2038 /* try to talk to GDB (or anyone insane enough to want to type GDB protocol by hand) */
2039 gdbstub_proto("### GDB Tx ACK\n");
2040 gdbstub_tx_char('+'); /* 'hello world' */
2041
2042 #ifdef CONFIG_GDBSTUB_IMMEDIATE
2043 gdbstub_printk("GDB Stub waiting for packet\n");
2044
2045 /*
2046 * In case GDB is started before us, ack any packets
2047 * (presumably "$?#xx") sitting there.
2048 */
2049 do { gdbstub_rx_char(&ch, 0); } while (ch != '$');
2050 do { gdbstub_rx_char(&ch, 0); } while (ch != '#');
2051 do { ret = gdbstub_rx_char(&ch, 0); } while (ret != 0); /* eat first csum byte */
2052 do { ret = gdbstub_rx_char(&ch, 0); } while (ret != 0); /* eat second csum byte */
2053
2054 gdbstub_proto("### GDB Tx NAK\n");
2055 gdbstub_tx_char('-'); /* nak it */
2056
2057 #else
2058 gdbstub_printk("GDB Stub set\n");
2059 #endif
2060
2061 #if 0
2062 /* send banner */
2063 ptr = output_buffer;
2064 *ptr++ = 'O';
2065 ptr = mem2hex(gdbstub_banner, ptr, sizeof(gdbstub_banner) - 1, 0);
2066 gdbstub_send_packet(output_buffer);
2067 #endif
2068 #if defined(CONFIG_GDB_CONSOLE) && defined(CONFIG_GDBSTUB_IMMEDIATE)
2069 register_console(&gdbstub_console);
2070 #endif
2071
2072 } /* end gdbstub_init() */
2073
2074 /*****************************************************************************/
2075 /*
2076 * register the console at a more appropriate time
2077 */
2078 #if defined (CONFIG_GDB_CONSOLE) && !defined(CONFIG_GDBSTUB_IMMEDIATE)
gdbstub_postinit(void)2079 static int __init gdbstub_postinit(void)
2080 {
2081 printk("registering console\n");
2082 register_console(&gdbstub_console);
2083 return 0;
2084 } /* end gdbstub_postinit() */
2085
2086 __initcall(gdbstub_postinit);
2087 #endif
2088
2089 /*****************************************************************************/
2090 /*
2091 * send an exit message to GDB
2092 */
gdbstub_exit(int status)2093 void gdbstub_exit(int status)
2094 {
2095 unsigned char checksum;
2096 int count;
2097 unsigned char ch;
2098
2099 sprintf(output_buffer,"W%02x",status&0xff);
2100
2101 gdbstub_tx_char('$');
2102 checksum = 0;
2103 count = 0;
2104
2105 while ((ch = output_buffer[count]) != 0) {
2106 gdbstub_tx_char(ch);
2107 checksum += ch;
2108 count += 1;
2109 }
2110
2111 gdbstub_tx_char('#');
2112 gdbstub_tx_char(hex_asc_hi(checksum));
2113 gdbstub_tx_char(hex_asc_lo(checksum));
2114
2115 /* make sure the output is flushed, or else RedBoot might clobber it */
2116 gdbstub_tx_char('-');
2117 gdbstub_tx_flush();
2118
2119 } /* end gdbstub_exit() */
2120
2121 /*****************************************************************************/
2122 /*
2123 * GDB wants to call malloc() and free() to allocate memory for calling kernel
2124 * functions directly from its command line
2125 */
2126 static void *malloc(size_t size) __maybe_unused;
malloc(size_t size)2127 static void *malloc(size_t size)
2128 {
2129 return kmalloc(size, GFP_ATOMIC);
2130 }
2131
2132 static void free(void *p) __maybe_unused;
free(void * p)2133 static void free(void *p)
2134 {
2135 kfree(p);
2136 }
2137
2138 static uint32_t ___get_HSR0(void) __maybe_unused;
___get_HSR0(void)2139 static uint32_t ___get_HSR0(void)
2140 {
2141 return __get_HSR(0);
2142 }
2143
2144 static uint32_t ___set_HSR0(uint32_t x) __maybe_unused;
___set_HSR0(uint32_t x)2145 static uint32_t ___set_HSR0(uint32_t x)
2146 {
2147 __set_HSR(0, x);
2148 return __get_HSR(0);
2149 }
2150