summaryrefslogtreecommitdiffstats
path: root/arch/sh64/lib/dbg.c
blob: 526fedae6db878e7d1cf19861a157cc62b388952 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
/*--------------------------------------------------------------------------
--
-- Identity : Linux50 Debug Funcions
--
-- File     : arch/sh64/lib/dbg.C
--
-- Copyright 2000, 2001 STMicroelectronics Limited.
-- Copyright 2004 Richard Curnow (evt_debug etc)
--
--------------------------------------------------------------------------*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <asm/mmu_context.h>

typedef u64 regType_t;

static regType_t getConfigReg(u64 id)
{
	register u64 reg __asm__("r2");
	asm volatile ("getcfg   %1, 0, %0":"=r" (reg):"r"(id));
	return (reg);
}

/* ======================================================================= */

static char *szTab[] = { "4k", "64k", "1M", "512M" };
static char *protTab[] = { "----",
	"---R",
	"--X-",
	"--XR",
	"-W--",
	"-W-R",
	"-WX-",
	"-WXR",
	"U---",
	"U--R",
	"U-X-",
	"U-XR",
	"UW--",
	"UW-R",
	"UWX-",
	"UWXR"
};
#define  ITLB_BASE	0x00000000
#define  DTLB_BASE	0x00800000
#define  MAX_TLBs		64
/* PTE High */
#define  GET_VALID(pte)        ((pte) & 0x1)
#define  GET_SHARED(pte)       ((pte) & 0x2)
#define  GET_ASID(pte)         ((pte >> 2) & 0x0ff)
#define  GET_EPN(pte)          ((pte) & 0xfffff000)

/* PTE Low */
#define  GET_CBEHAVIOR(pte)    ((pte) & 0x3)
#define  GET_PAGE_SIZE(pte)    szTab[((pte >> 3) & 0x3)]
#define  GET_PROTECTION(pte)   protTab[((pte >> 6) & 0xf)]
#define  GET_PPN(pte)          ((pte) & 0xfffff000)

#define PAGE_1K_MASK           0x00000000
#define PAGE_4K_MASK           0x00000010
#define PAGE_64K_MASK          0x00000080
#define MMU_PAGESIZE_MASK      (PAGE_64K_MASK | PAGE_4K_MASK)
#define PAGE_1MB_MASK          MMU_PAGESIZE_MASK
#define PAGE_1K                (1024)
#define PAGE_4K                (1024 * 4)
#define PAGE_64K               (1024 * 64)
#define PAGE_1MB               (1024 * 1024)

#define HOW_TO_READ_TLB_CONTENT  \
       "[ ID]  PPN         EPN        ASID  Share  CB  P.Size   PROT.\n"

void print_single_tlb(unsigned long tlb, int single_print)
{
	regType_t pteH;
	regType_t pteL;
	unsigned int valid, shared, asid, epn, cb, ppn;
	char *pSize;
	char *pProt;

	/*
	   ** in case of single print <single_print> is true, this implies:
	   **   1) print the TLB in any case also if NOT VALID
	   **   2) print out the header
	 */

	pteH = getConfigReg(tlb);
	valid = GET_VALID(pteH);
	if (single_print)
		printk(HOW_TO_READ_TLB_CONTENT);
	else if (!valid)
		return;

	pteL = getConfigReg(tlb + 1);

	shared = GET_SHARED(pteH);
	asid = GET_ASID(pteH);
	epn = GET_EPN(pteH);
	cb = GET_CBEHAVIOR(pteL);
	pSize = GET_PAGE_SIZE(pteL);
	pProt = GET_PROTECTION(pteL);
	ppn = GET_PPN(pteL);
	printk("[%c%2ld]  0x%08x  0x%08x  %03d   %02x    %02x   %4s    %s\n",
	       ((valid) ? ' ' : 'u'), ((tlb & 0x0ffff) / TLB_STEP),
	       ppn, epn, asid, shared, cb, pSize, pProt);
}

void print_dtlb(void)
{
	int count;
	unsigned long tlb;

	printk(" ================= SH-5 D-TLBs Status ===================\n");
	printk(HOW_TO_READ_TLB_CONTENT);
	tlb = DTLB_BASE;
	for (count = 0; count < MAX_TLBs; count++, tlb += TLB_STEP)
		print_single_tlb(tlb, 0);
	printk
	    (" =============================================================\n");
}

void print_itlb(void)
{
	int count;
	unsigned long tlb;

	printk(" ================= SH-5 I-TLBs Status ===================\n");
	printk(HOW_TO_READ_TLB_CONTENT);
	tlb = ITLB_BASE;
	for (count = 0; count < MAX_TLBs; count++, tlb += TLB_STEP)
		print_single_tlb(tlb, 0);
	printk
	    (" =============================================================\n");
}

/* ======================================================================= */

#ifdef CONFIG_POOR_MANS_STRACE

#include "syscalltab.h"

struct ring_node {
	int evt;
	int ret_addr;
	int event;
	int tra;
	int pid;
	unsigned long sp;
	unsigned long pc;
};

static struct ring_node event_ring[16];
static int event_ptr = 0;

struct stored_syscall_data {
	int pid;
	int syscall_number;
};

#define N_STORED_SYSCALLS 16

static struct stored_syscall_data stored_syscalls[N_STORED_SYSCALLS];
static int syscall_next=0;
static int syscall_next_print=0;

void evt_debug(int evt, int ret_addr, int event, int tra, struct pt_regs *regs)
{
	int syscallno = tra & 0xff;
	unsigned long sp;
	unsigned long stack_bottom;
	int pid;
	struct ring_node *rr;

	pid = current->pid;
	stack_bottom = (unsigned long) current->thread_info;
	asm volatile("ori r15, 0, %0" : "=r" (sp));
	rr = event_ring + event_ptr;
	rr->evt = evt;
	rr->ret_addr = ret_addr;
	rr->event = event;
	rr->tra = tra;
	rr->pid = pid;
	rr->sp = sp;
	rr->pc = regs->pc;

	if (sp < stack_bottom + 3092) {
		printk("evt_debug : stack underflow report\n");
		int i, j;
		for (j=0, i = event_ptr; j<16; j++) {
			rr = event_ring + i;
			printk("evt=%08x event=%08x tra=%08x pid=%5d sp=%08lx pc=%08lx\n",
				rr->evt, rr->event, rr->tra, rr->pid, rr->sp, rr->pc);
			i--;
			i &= 15;
		}
		panic("STACK UNDERFLOW\n");
	}

	event_ptr = (event_ptr + 1) & 15;

	if ((event == 2) && (evt == 0x160)) {
		if (syscallno < NUM_SYSCALL_INFO_ENTRIES) {
			/* Store the syscall information to print later.  We
			 * can't print this now - currently we're running with
			 * SR.BL=1, so we can't take a tlbmiss (which could occur
			 * in the console drivers under printk).
			 *
			 * Just overwrite old entries on ring overflow - this
			 * is only for last-hope debugging. */
			stored_syscalls[syscall_next].pid = current->pid;
			stored_syscalls[syscall_next].syscall_number = syscallno;
			syscall_next++;
			syscall_next &= (N_STORED_SYSCALLS - 1);
		}
	}
}

static void drain_syscalls(void) {
	while (syscall_next_print != syscall_next) {
		printk("Task %d: %s()\n",
			stored_syscalls[syscall_next_print].pid,
			syscall_info_table[stored_syscalls[syscall_next_print].syscall_number].name);
			syscall_next_print++;
			syscall_next_print &= (N_STORED_SYSCALLS - 1);
	}
}

void evt_debug2(unsigned int ret)
{
	drain_syscalls();
	printk("Task %d: syscall returns %08x\n", current->pid, ret);
}

void evt_debug_ret_from_irq(struct pt_regs *regs)
{
	int pid;
	struct ring_node *rr;

	pid = current->pid;
	rr = event_ring + event_ptr;
	rr->evt = 0xffff;
	rr->ret_addr = 0;
	rr->event = 0;
	rr->tra = 0;
	rr->pid = pid;
	rr->pc = regs->pc;
	event_ptr = (event_ptr + 1) & 15;
}

void evt_debug_ret_from_exc(struct pt_regs *regs)
{
	int pid;
	struct ring_node *rr;

	pid = current->pid;
	rr = event_ring + event_ptr;
	rr->evt = 0xfffe;
	rr->ret_addr = 0;
	rr->event = 0;
	rr->tra = 0;
	rr->pid = pid;
	rr->pc = regs->pc;
	event_ptr = (event_ptr + 1) & 15;
}

#endif /* CONFIG_POOR_MANS_STRACE */

/* ======================================================================= */

void show_excp_regs(char *from, int trapnr, int signr, struct pt_regs *regs)
{

	unsigned long long ah, al, bh, bl, ch, cl;

	printk("\n");
	printk("EXCEPTION - %s: task %d; Linux trap # %d; signal = %d\n",
	       ((from) ? from : "???"), current->pid, trapnr, signr);

	asm volatile ("getcon   " __EXPEVT ", %0":"=r"(ah));
	asm volatile ("getcon   " __EXPEVT ", %0":"=r"(al));
	ah = (ah) >> 32;
	al = (al) & 0xffffffff;
	asm volatile ("getcon   " __KCR1 ", %0":"=r"(bh));
	asm volatile ("getcon   " __KCR1 ", %0":"=r"(bl));
	bh = (bh) >> 32;
	bl = (bl) & 0xffffffff;
	asm volatile ("getcon   " __INTEVT ", %0":"=r"(ch));
	asm volatile ("getcon   " __INTEVT ", %0":"=r"(cl));
	ch = (ch) >> 32;
	cl = (cl) & 0xffffffff;
	printk("EXPE: %08Lx%08Lx KCR1: %08Lx%08Lx INTE: %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	asm volatile ("getcon   " __PEXPEVT ", %0":"=r"(ah));
	asm volatile ("getcon   " __PEXPEVT ", %0":"=r"(al));
	ah = (ah) >> 32;
	al = (al) & 0xffffffff;
	asm volatile ("getcon   " __PSPC ", %0":"=r"(bh));
	asm volatile ("getcon   " __PSPC ", %0":"=r"(bl));
	bh = (bh) >> 32;
	bl = (bl) & 0xffffffff;
	asm volatile ("getcon   " __PSSR ", %0":"=r"(ch));
	asm volatile ("getcon   " __PSSR ", %0":"=r"(cl));
	ch = (ch) >> 32;
	cl = (cl) & 0xffffffff;
	printk("PEXP: %08Lx%08Lx PSPC: %08Lx%08Lx PSSR: %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->pc) >> 32;
	al = (regs->pc) & 0xffffffff;
	bh = (regs->regs[18]) >> 32;
	bl = (regs->regs[18]) & 0xffffffff;
	ch = (regs->regs[15]) >> 32;
	cl = (regs->regs[15]) & 0xffffffff;
	printk("PC  : %08Lx%08Lx LINK: %08Lx%08Lx SP  : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->sr) >> 32;
	al = (regs->sr) & 0xffffffff;
	asm volatile ("getcon   " __TEA ", %0":"=r"(bh));
	asm volatile ("getcon   " __TEA ", %0":"=r"(bl));
	bh = (bh) >> 32;
	bl = (bl) & 0xffffffff;
	asm volatile ("getcon   " __KCR0 ", %0":"=r"(ch));
	asm volatile ("getcon   " __KCR0 ", %0":"=r"(cl));
	ch = (ch) >> 32;
	cl = (cl) & 0xffffffff;
	printk("SR  : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[0]) >> 32;
	al = (regs->regs[0]) & 0xffffffff;
	bh = (regs->regs[1]) >> 32;
	bl = (regs->regs[1]) & 0xffffffff;
	ch = (regs->regs[2]) >> 32;
	cl = (regs->regs[2]) & 0xffffffff;
	printk("R0  : %08Lx%08Lx R1  : %08Lx%08Lx R2  : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[3]) >> 32;
	al = (regs->regs[3]) & 0xffffffff;
	bh = (regs->regs[4]) >> 32;
	bl = (regs->regs[4]) & 0xffffffff;
	ch = (regs->regs[5]) >> 32;
	cl = (regs->regs[5]) & 0xffffffff;
	printk("R3  : %08Lx%08Lx R4  : %08Lx%08Lx R5  : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[6]) >> 32;
	al = (regs->regs[6]) & 0xffffffff;
	bh = (regs->regs[7]) >> 32;
	bl = (regs->regs[7]) & 0xffffffff;
	ch = (regs->regs[8]) >> 32;
	cl = (regs->regs[8]) & 0xffffffff;
	printk("R6  : %08Lx%08Lx R7  : %08Lx%08Lx R8  : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);

	ah = (regs->regs[9]) >> 32;
	al = (regs->regs[9]) & 0xffffffff;
	bh = (regs->regs[10]) >> 32;
	bl = (regs->regs[10]) & 0xffffffff;
	ch = (regs->regs[11]) >> 32;
	cl = (regs->regs[11]) & 0xffffffff;
	printk("R9  : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);
	printk("....\n");

	ah = (regs->tregs[0]) >> 32;
	al = (regs->tregs[0]) & 0xffffffff;
	bh = (regs->tregs[1]) >> 32;
	bl = (regs->tregs[1]) & 0xffffffff;
	ch = (regs->tregs[2]) >> 32;
	cl = (regs->tregs[2]) & 0xffffffff;
	printk("T0  : %08Lx%08Lx T1  : %08Lx%08Lx T2  : %08Lx%08Lx\n",
	       ah, al, bh, bl, ch, cl);
	printk("....\n");

	print_dtlb();
	print_itlb();
}

/* ======================================================================= */

/*
** Depending on <base> scan the MMU, Data or Instrction side
** looking for a valid mapping matching Eaddr & asid.
** Return -1 if not found or the TLB id entry otherwise.
** Note: it works only for 4k pages!
*/
static unsigned long
lookup_mmu_side(unsigned long base, unsigned long Eaddr, unsigned long asid)
{
	regType_t pteH;
	unsigned long epn;
	int count;

	epn = Eaddr & 0xfffff000;

	for (count = 0; count < MAX_TLBs; count++, base += TLB_STEP) {
		pteH = getConfigReg(base);
		if (GET_VALID(pteH))
			if ((unsigned long) GET_EPN(pteH) == epn)
				if ((unsigned long) GET_ASID(pteH) == asid)
					break;
	}
	return ((unsigned long) ((count < MAX_TLBs) ? base : -1));
}

unsigned long lookup_dtlb(unsigned long Eaddr)
{
	unsigned long asid = get_asid();
	return (lookup_mmu_side((u64) DTLB_BASE, Eaddr, asid));
}

unsigned long lookup_itlb(unsigned long Eaddr)
{
	unsigned long asid = get_asid();
	return (lookup_mmu_side((u64) ITLB_BASE, Eaddr, asid));
}

void print_page(struct page *page)
{
	printk("  page[%p] -> index 0x%lx,  count 0x%x,  flags 0x%lx\n",
	       page, page->index, page_count(page), page->flags);
	printk("       address_space = %p, pages =%ld\n", page->mapping,
	       page->mapping->nrpages);

}
OpenPOWER on IntegriCloud