arch/sh64/lib/dbg.c

   1 /*--------------------------------------------------------------------------
   2 --
   3 -- Identity : Linux50 Debug Funcions
   4 --
   5 -- File     : arch/sh64/lib/dbg.C
   6 --
   7 -- Copyright 2000, 2001 STMicroelectronics Limited.
   8 -- Copyright 2004 Richard Curnow (evt_debug etc)
   9 --
  10 --------------------------------------------------------------------------*/
  11 #include <linux/types.h>
  12 #include <linux/kernel.h>
  13 #include <linux/sched.h>
  14 #include <linux/mm.h>
  15 #include <asm/mmu_context.h>
  16
  17 typedef u64 regType_t;
  18
  19 static regType_t getConfigReg(u64 id)
  20 {
  21         register u64 reg __asm__("r2");
  22         asm volatile ("getcfg   %1, 0, %0":"=r" (reg):"r"(id));
  23         return (reg);
  24 }
  25
  26 /* ======================================================================= */
  27
  28 static char *szTab[] = { "4k", "64k", "1M", "512M" };
  29 static char *protTab[] = { "----",
  30         "---R",
  31         "--X-",
  32         "--XR",
  33         "-W--",
  34         "-W-R",
  35         "-WX-",
  36         "-WXR",
  37         "U---",
  38         "U--R",
  39         "U-X-",
  40         "U-XR",
  41         "UW--",
  42         "UW-R",
  43         "UWX-",
  44         "UWXR"
  45 };
  46 #define  ITLB_BASE      0x00000000
  47 #define  DTLB_BASE      0x00800000
  48 #define  MAX_TLBs               64
  49 /* PTE High */
  50 #define  GET_VALID(pte)        ((pte) & 0x1)
  51 #define  GET_SHARED(pte)       ((pte) & 0x2)
  52 #define  GET_ASID(pte)         ((pte >> 2) & 0x0ff)
  53 #define  GET_EPN(pte)          ((pte) & 0xfffff000)
  54
  55 /* PTE Low */
  56 #define  GET_CBEHAVIOR(pte)    ((pte) & 0x3)
  57 #define  GET_PAGE_SIZE(pte)    szTab[((pte >> 3) & 0x3)]
  58 #define  GET_PROTECTION(pte)   protTab[((pte >> 6) & 0xf)]
  59 #define  GET_PPN(pte)          ((pte) & 0xfffff000)
  60
  61 #define PAGE_1K_MASK           0x00000000
  62 #define PAGE_4K_MASK           0x00000010
  63 #define PAGE_64K_MASK          0x00000080
  64 #define MMU_PAGESIZE_MASK      (PAGE_64K_MASK | PAGE_4K_MASK)
  65 #define PAGE_1MB_MASK          MMU_PAGESIZE_MASK
  66 #define PAGE_1K                (1024)
  67 #define PAGE_4K                (1024 * 4)
  68 #define PAGE_64K               (1024 * 64)
  69 #define PAGE_1MB               (1024 * 1024)
  70
  71 #define HOW_TO_READ_TLB_CONTENT  \
  72        "[ ID]  PPN         EPN        ASID  Share  CB  P.Size   PROT.\n"
  73
  74 void print_single_tlb(unsigned long tlb, int single_print)
  75 {
  76         regType_t pteH;
  77         regType_t pteL;
  78         unsigned int valid, shared, asid, epn, cb, ppn;
  79         char *pSize;
  80         char *pProt;
  81
  82         /*
  83            ** in case of single print <single_print> is true, this implies:
  84            **   1) print the TLB in any case also if NOT VALID
  85            **   2) print out the header
  86          */
  87
  88         pteH = getConfigReg(tlb);
  89         valid = GET_VALID(pteH);
  90         if (single_print)
  91                 printk(HOW_TO_READ_TLB_CONTENT);
  92         else if (!valid)
  93                 return;
  94
  95         pteL = getConfigReg(tlb + 1);
  96
  97         shared = GET_SHARED(pteH);
  98         asid = GET_ASID(pteH);
  99         epn = GET_EPN(pteH);
 100         cb = GET_CBEHAVIOR(pteL);
 101         pSize = GET_PAGE_SIZE(pteL);
 102         pProt = GET_PROTECTION(pteL);
 103         ppn = GET_PPN(pteL);
 104         printk("[%c%2ld]  0x%08x  0x%08x  %03d   %02x    %02x   %4s    %s\n",
 105                ((valid) ? ' ' : 'u'), ((tlb & 0x0ffff) / TLB_STEP),
 106                ppn, epn, asid, shared, cb, pSize, pProt);
 107 }
 108
 109 void print_dtlb(void)
 110 {
 111         int count;
 112         unsigned long tlb;
 113
 114         printk(" ================= SH-5 D-TLBs Status ===================\n");
 115         printk(HOW_TO_READ_TLB_CONTENT);
 116         tlb = DTLB_BASE;
 117         for (count = 0; count < MAX_TLBs; count++, tlb += TLB_STEP)
 118                 print_single_tlb(tlb, 0);
 119         printk
 120             (" =============================================================\n");
 121 }
 122
 123 void print_itlb(void)
 124 {
 125         int count;
 126         unsigned long tlb;
 127
 128         printk(" ================= SH-5 I-TLBs Status ===================\n");
 129         printk(HOW_TO_READ_TLB_CONTENT);
 130         tlb = ITLB_BASE;
 131         for (count = 0; count < MAX_TLBs; count++, tlb += TLB_STEP)
 132                 print_single_tlb(tlb, 0);
 133         printk
 134             (" =============================================================\n");
 135 }
 136
 137 /* ======================================================================= */
 138
 139 #ifdef CONFIG_POOR_MANS_STRACE
 140
 141 #include "syscalltab.h"
 142
 143 struct ring_node {
 144         int evt;
 145         int ret_addr;
 146         int event;
 147         int tra;
 148         int pid;
 149         unsigned long sp;
 150         unsigned long pc;
 151 };
 152
 153 static struct ring_node event_ring[16];
 154 static int event_ptr = 0;
 155
 156 struct stored_syscall_data {
 157         int pid;
 158         int syscall_number;
 159 };
 160
 161 #define N_STORED_SYSCALLS 16
 162
 163 static struct stored_syscall_data stored_syscalls[N_STORED_SYSCALLS];
 164 static int syscall_next=0;
 165 static int syscall_next_print=0;
 166
 167 void evt_debug(int evt, int ret_addr, int event, int tra, struct pt_regs *regs)
 168 {
 169         int syscallno = tra & 0xff;
 170         unsigned long sp;
 171         unsigned long stack_bottom;
 172         int pid;
 173         struct ring_node *rr;
 174
 175         pid = current->pid;
 176         stack_bottom = (unsigned long) task_stack_page(current);
 177         asm volatile("ori r15, 0, %0" : "=r" (sp));
 178         rr = event_ring + event_ptr;
 179         rr->evt = evt;
 180         rr->ret_addr = ret_addr;
 181         rr->event = event;
 182         rr->tra = tra;
 183         rr->pid = pid;
 184         rr->sp = sp;
 185         rr->pc = regs->pc;
 186
 187         if (sp < stack_bottom + 3092) {
 188                 printk("evt_debug : stack underflow report\n");
 189                 int i, j;
 190                 for (j=0, i = event_ptr; j<16; j++) {
 191                         rr = event_ring + i;
 192                         printk("evt=%08x event=%08x tra=%08x pid=%5d sp=%08lx pc=%08lx\n",
 193                                 rr->evt, rr->event, rr->tra, rr->pid, rr->sp, rr->pc);
 194                         i--;
 195                         i &= 15;
 196                 }
 197                 panic("STACK UNDERFLOW\n");
 198         }
 199
 200         event_ptr = (event_ptr + 1) & 15;
 201
 202         if ((event == 2) && (evt == 0x160)) {
 203                 if (syscallno < NUM_SYSCALL_INFO_ENTRIES) {
 204                         /* Store the syscall information to print later.  We
 205                          * can't print this now - currently we're running with
 206                          * SR.BL=1, so we can't take a tlbmiss (which could occur
 207                          * in the console drivers under printk).
 208                          *
 209                          * Just overwrite old entries on ring overflow - this
 210                          * is only for last-hope debugging. */
 211                         stored_syscalls[syscall_next].pid = current->pid;
 212                         stored_syscalls[syscall_next].syscall_number = syscallno;
 213                         syscall_next++;
 214                         syscall_next &= (N_STORED_SYSCALLS - 1);
 215                 }
 216         }
 217 }
 218
 219 static void drain_syscalls(void) {
 220         while (syscall_next_print != syscall_next) {
 221                 printk("Task %d: %s()\n",
 222                         stored_syscalls[syscall_next_print].pid,
 223                         syscall_info_table[stored_syscalls[syscall_next_print].syscall_number].name);
 224                         syscall_next_print++;
 225                         syscall_next_print &= (N_STORED_SYSCALLS - 1);
 226         }
 227 }
 228
 229 void evt_debug2(unsigned int ret)
 230 {
 231         drain_syscalls();
 232         printk("Task %d: syscall returns %08x\n", current->pid, ret);
 233 }
 234
 235 void evt_debug_ret_from_irq(struct pt_regs *regs)
 236 {
 237         int pid;
 238         struct ring_node *rr;
 239
 240         pid = current->pid;
 241         rr = event_ring + event_ptr;
 242         rr->evt = 0xffff;
 243         rr->ret_addr = 0;
 244         rr->event = 0;
 245         rr->tra = 0;
 246         rr->pid = pid;
 247         rr->pc = regs->pc;
 248         event_ptr = (event_ptr + 1) & 15;
 249 }
 250
 251 void evt_debug_ret_from_exc(struct pt_regs *regs)
 252 {
 253         int pid;
 254         struct ring_node *rr;
 255
 256         pid = current->pid;
 257         rr = event_ring + event_ptr;
 258         rr->evt = 0xfffe;
 259         rr->ret_addr = 0;
 260         rr->event = 0;
 261         rr->tra = 0;
 262         rr->pid = pid;
 263         rr->pc = regs->pc;
 264         event_ptr = (event_ptr + 1) & 15;
 265 }
 266
 267 #endif /* CONFIG_POOR_MANS_STRACE */
 268
 269 /* ======================================================================= */
 270
 271 void show_excp_regs(char *from, int trapnr, int signr, struct pt_regs *regs)
 272 {
 273
 274         unsigned long long ah, al, bh, bl, ch, cl;
 275
 276         printk("\n");
 277         printk("EXCEPTION - %s: task %d; Linux trap # %d; signal = %d\n",
 278                ((from) ? from : "???"), current->pid, trapnr, signr);
 279
 280         asm volatile ("getcon   " __EXPEVT ", %0":"=r"(ah));
 281         asm volatile ("getcon   " __EXPEVT ", %0":"=r"(al));
 282         ah = (ah) >> 32;
 283         al = (al) & 0xffffffff;
 284         asm volatile ("getcon   " __KCR1 ", %0":"=r"(bh));
 285         asm volatile ("getcon   " __KCR1 ", %0":"=r"(bl));
 286         bh = (bh) >> 32;
 287         bl = (bl) & 0xffffffff;
 288         asm volatile ("getcon   " __INTEVT ", %0":"=r"(ch));
 289         asm volatile ("getcon   " __INTEVT ", %0":"=r"(cl));
 290         ch = (ch) >> 32;
 291         cl = (cl) & 0xffffffff;
 292         printk("EXPE: %08Lx%08Lx KCR1: %08Lx%08Lx INTE: %08Lx%08Lx\n",
 293                ah, al, bh, bl, ch, cl);
 294
 295         asm volatile ("getcon   " __PEXPEVT ", %0":"=r"(ah));
 296         asm volatile ("getcon   " __PEXPEVT ", %0":"=r"(al));
 297         ah = (ah) >> 32;
 298         al = (al) & 0xffffffff;
 299         asm volatile ("getcon   " __PSPC ", %0":"=r"(bh));
 300         asm volatile ("getcon   " __PSPC ", %0":"=r"(bl));
 301         bh = (bh) >> 32;
 302         bl = (bl) & 0xffffffff;
 303         asm volatile ("getcon   " __PSSR ", %0":"=r"(ch));
 304         asm volatile ("getcon   " __PSSR ", %0":"=r"(cl));
 305         ch = (ch) >> 32;
 306         cl = (cl) & 0xffffffff;
 307         printk("PEXP: %08Lx%08Lx PSPC: %08Lx%08Lx PSSR: %08Lx%08Lx\n",
 308                ah, al, bh, bl, ch, cl);
 309
 310         ah = (regs->pc) >> 32;
 311         al = (regs->pc) & 0xffffffff;
 312         bh = (regs->regs[18]) >> 32;
 313         bl = (regs->regs[18]) & 0xffffffff;
 314         ch = (regs->regs[15]) >> 32;
 315         cl = (regs->regs[15]) & 0xffffffff;
 316         printk("PC  : %08Lx%08Lx LINK: %08Lx%08Lx SP  : %08Lx%08Lx\n",
 317                ah, al, bh, bl, ch, cl);
 318
 319         ah = (regs->sr) >> 32;
 320         al = (regs->sr) & 0xffffffff;
 321         asm volatile ("getcon   " __TEA ", %0":"=r"(bh));
 322         asm volatile ("getcon   " __TEA ", %0":"=r"(bl));
 323         bh = (bh) >> 32;
 324         bl = (bl) & 0xffffffff;
 325         asm volatile ("getcon   " __KCR0 ", %0":"=r"(ch));
 326         asm volatile ("getcon   " __KCR0 ", %0":"=r"(cl));
 327         ch = (ch) >> 32;
 328         cl = (cl) & 0xffffffff;
 329         printk("SR  : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n",
 330                ah, al, bh, bl, ch, cl);
 331
 332         ah = (regs->regs[0]) >> 32;
 333         al = (regs->regs[0]) & 0xffffffff;
 334         bh = (regs->regs[1]) >> 32;
 335         bl = (regs->regs[1]) & 0xffffffff;
 336         ch = (regs->regs[2]) >> 32;
 337         cl = (regs->regs[2]) & 0xffffffff;
 338         printk("R0  : %08Lx%08Lx R1  : %08Lx%08Lx R2  : %08Lx%08Lx\n",
 339                ah, al, bh, bl, ch, cl);
 340
 341         ah = (regs->regs[3]) >> 32;
 342         al = (regs->regs[3]) & 0xffffffff;
 343         bh = (regs->regs[4]) >> 32;
 344         bl = (regs->regs[4]) & 0xffffffff;
 345         ch = (regs->regs[5]) >> 32;
 346         cl = (regs->regs[5]) & 0xffffffff;
 347         printk("R3  : %08Lx%08Lx R4  : %08Lx%08Lx R5  : %08Lx%08Lx\n",
 348                ah, al, bh, bl, ch, cl);
 349
 350         ah = (regs->regs[6]) >> 32;
 351         al = (regs->regs[6]) & 0xffffffff;
 352         bh = (regs->regs[7]) >> 32;
 353         bl = (regs->regs[7]) & 0xffffffff;
 354         ch = (regs->regs[8]) >> 32;
 355         cl = (regs->regs[8]) & 0xffffffff;
 356         printk("R6  : %08Lx%08Lx R7  : %08Lx%08Lx R8  : %08Lx%08Lx\n",
 357                ah, al, bh, bl, ch, cl);
 358
 359         ah = (regs->regs[9]) >> 32;
 360         al = (regs->regs[9]) & 0xffffffff;
 361         bh = (regs->regs[10]) >> 32;
 362         bl = (regs->regs[10]) & 0xffffffff;
 363         ch = (regs->regs[11]) >> 32;
 364         cl = (regs->regs[11]) & 0xffffffff;
 365         printk("R9  : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n",
 366                ah, al, bh, bl, ch, cl);
 367         printk("....\n");
 368
 369         ah = (regs->tregs[0]) >> 32;
 370         al = (regs->tregs[0]) & 0xffffffff;
 371         bh = (regs->tregs[1]) >> 32;
 372         bl = (regs->tregs[1]) & 0xffffffff;
 373         ch = (regs->tregs[2]) >> 32;
 374         cl = (regs->tregs[2]) & 0xffffffff;
 375         printk("T0  : %08Lx%08Lx T1  : %08Lx%08Lx T2  : %08Lx%08Lx\n",
 376                ah, al, bh, bl, ch, cl);
 377         printk("....\n");
 378
 379         print_dtlb();
 380         print_itlb();
 381 }
 382
 383 /* ======================================================================= */
 384
 385 /*
 386 ** Depending on <base> scan the MMU, Data or Instruction side
 387 ** looking for a valid mapping matching Eaddr & asid.
 388 ** Return -1 if not found or the TLB id entry otherwise.
 389 ** Note: it works only for 4k pages!
 390 */
 391 static unsigned long
 392 lookup_mmu_side(unsigned long base, unsigned long Eaddr, unsigned long asid)
 393 {
 394         regType_t pteH;
 395         unsigned long epn;
 396         int count;
 397
 398         epn = Eaddr & 0xfffff000;
 399
 400         for (count = 0; count < MAX_TLBs; count++, base += TLB_STEP) {
 401                 pteH = getConfigReg(base);
 402                 if (GET_VALID(pteH))
 403                         if ((unsigned long) GET_EPN(pteH) == epn)
 404                                 if ((unsigned long) GET_ASID(pteH) == asid)
 405                                         break;
 406         }
 407         return ((unsigned long) ((count < MAX_TLBs) ? base : -1));
 408 }
 409
 410 unsigned long lookup_dtlb(unsigned long Eaddr)
 411 {
 412         unsigned long asid = get_asid();
 413         return (lookup_mmu_side((u64) DTLB_BASE, Eaddr, asid));
 414 }
 415
 416 unsigned long lookup_itlb(unsigned long Eaddr)
 417 {
 418         unsigned long asid = get_asid();
 419         return (lookup_mmu_side((u64) ITLB_BASE, Eaddr, asid));
 420 }
 421
 422 void print_page(struct page *page)
 423 {
 424         printk("  page[%p] -> index 0x%lx,  count 0x%x,  flags 0x%lx\n",
 425                page, page->index, page_count(page), page->flags);
 426         printk("       address_space = %p, pages =%ld\n", page->mapping,
 427                page->mapping->nrpages);
 428
 429 }