arch/blackfin/kernel/kgdb.c

   1 /*
   2  * arch/blackfin/kernel/kgdb.c - Blackfin kgdb pieces
   3  *
   4  * Copyright 2005-2008 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <linux/string.h>
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <linux/smp.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/delay.h>
  15 #include <linux/ptrace.h>               /* for linux pt_regs struct */
  16 #include <linux/kgdb.h>
  17 #include <linux/console.h>
  18 #include <linux/init.h>
  19 #include <linux/errno.h>
  20 #include <linux/irq.h>
  21 #include <linux/uaccess.h>
  22 #include <asm/system.h>
  23 #include <asm/traps.h>
  24 #include <asm/blackfin.h>
  25 #include <asm/dma.h>
  26
  27 /* Put the error code here just in case the user cares.  */
  28 int gdb_bfin_errcode;
  29 /* Likewise, the vector number here (since GDB only gets the signal
  30    number through the usual means, and that's not very specific).  */
  31 int gdb_bfin_vector = -1;
  32
  33 #if KGDB_MAX_NO_CPUS != 8
  34 #error change the definition of slavecpulocks
  35 #endif
  36
  37 void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
  38 {
  39         gdb_regs[BFIN_R0] = regs->r0;
  40         gdb_regs[BFIN_R1] = regs->r1;
  41         gdb_regs[BFIN_R2] = regs->r2;
  42         gdb_regs[BFIN_R3] = regs->r3;
  43         gdb_regs[BFIN_R4] = regs->r4;
  44         gdb_regs[BFIN_R5] = regs->r5;
  45         gdb_regs[BFIN_R6] = regs->r6;
  46         gdb_regs[BFIN_R7] = regs->r7;
  47         gdb_regs[BFIN_P0] = regs->p0;
  48         gdb_regs[BFIN_P1] = regs->p1;
  49         gdb_regs[BFIN_P2] = regs->p2;
  50         gdb_regs[BFIN_P3] = regs->p3;
  51         gdb_regs[BFIN_P4] = regs->p4;
  52         gdb_regs[BFIN_P5] = regs->p5;
  53         gdb_regs[BFIN_SP] = regs->reserved;
  54         gdb_regs[BFIN_FP] = regs->fp;
  55         gdb_regs[BFIN_I0] = regs->i0;
  56         gdb_regs[BFIN_I1] = regs->i1;
  57         gdb_regs[BFIN_I2] = regs->i2;
  58         gdb_regs[BFIN_I3] = regs->i3;
  59         gdb_regs[BFIN_M0] = regs->m0;
  60         gdb_regs[BFIN_M1] = regs->m1;
  61         gdb_regs[BFIN_M2] = regs->m2;
  62         gdb_regs[BFIN_M3] = regs->m3;
  63         gdb_regs[BFIN_B0] = regs->b0;
  64         gdb_regs[BFIN_B1] = regs->b1;
  65         gdb_regs[BFIN_B2] = regs->b2;
  66         gdb_regs[BFIN_B3] = regs->b3;
  67         gdb_regs[BFIN_L0] = regs->l0;
  68         gdb_regs[BFIN_L1] = regs->l1;
  69         gdb_regs[BFIN_L2] = regs->l2;
  70         gdb_regs[BFIN_L3] = regs->l3;
  71         gdb_regs[BFIN_A0_DOT_X] = regs->a0x;
  72         gdb_regs[BFIN_A0_DOT_W] = regs->a0w;
  73         gdb_regs[BFIN_A1_DOT_X] = regs->a1x;
  74         gdb_regs[BFIN_A1_DOT_W] = regs->a1w;
  75         gdb_regs[BFIN_ASTAT] = regs->astat;
  76         gdb_regs[BFIN_RETS] = regs->rets;
  77         gdb_regs[BFIN_LC0] = regs->lc0;
  78         gdb_regs[BFIN_LT0] = regs->lt0;
  79         gdb_regs[BFIN_LB0] = regs->lb0;
  80         gdb_regs[BFIN_LC1] = regs->lc1;
  81         gdb_regs[BFIN_LT1] = regs->lt1;
  82         gdb_regs[BFIN_LB1] = regs->lb1;
  83         gdb_regs[BFIN_CYCLES] = 0;
  84         gdb_regs[BFIN_CYCLES2] = 0;
  85         gdb_regs[BFIN_USP] = regs->usp;
  86         gdb_regs[BFIN_SEQSTAT] = regs->seqstat;
  87         gdb_regs[BFIN_SYSCFG] = regs->syscfg;
  88         gdb_regs[BFIN_RETI] = regs->pc;
  89         gdb_regs[BFIN_RETX] = regs->retx;
  90         gdb_regs[BFIN_RETN] = regs->retn;
  91         gdb_regs[BFIN_RETE] = regs->rete;
  92         gdb_regs[BFIN_PC] = regs->pc;
  93         gdb_regs[BFIN_CC] = 0;
  94         gdb_regs[BFIN_EXTRA1] = 0;
  95         gdb_regs[BFIN_EXTRA2] = 0;
  96         gdb_regs[BFIN_EXTRA3] = 0;
  97         gdb_regs[BFIN_IPEND] = regs->ipend;
  98 }
  99
 100 /*
 101  * Extracts ebp, esp and eip values understandable by gdb from the values
 102  * saved by switch_to.
 103  * thread.esp points to ebp. flags and ebp are pushed in switch_to hence esp
 104  * prior to entering switch_to is 8 greater than the value that is saved.
 105  * If switch_to changes, change following code appropriately.
 106  */
 107 void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
 108 {
 109         gdb_regs[BFIN_SP] = p->thread.ksp;
 110         gdb_regs[BFIN_PC] = p->thread.pc;
 111         gdb_regs[BFIN_SEQSTAT] = p->thread.seqstat;
 112 }
 113
 114 void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
 115 {
 116         regs->r0 = gdb_regs[BFIN_R0];
 117         regs->r1 = gdb_regs[BFIN_R1];
 118         regs->r2 = gdb_regs[BFIN_R2];
 119         regs->r3 = gdb_regs[BFIN_R3];
 120         regs->r4 = gdb_regs[BFIN_R4];
 121         regs->r5 = gdb_regs[BFIN_R5];
 122         regs->r6 = gdb_regs[BFIN_R6];
 123         regs->r7 = gdb_regs[BFIN_R7];
 124         regs->p0 = gdb_regs[BFIN_P0];
 125         regs->p1 = gdb_regs[BFIN_P1];
 126         regs->p2 = gdb_regs[BFIN_P2];
 127         regs->p3 = gdb_regs[BFIN_P3];
 128         regs->p4 = gdb_regs[BFIN_P4];
 129         regs->p5 = gdb_regs[BFIN_P5];
 130         regs->fp = gdb_regs[BFIN_FP];
 131         regs->i0 = gdb_regs[BFIN_I0];
 132         regs->i1 = gdb_regs[BFIN_I1];
 133         regs->i2 = gdb_regs[BFIN_I2];
 134         regs->i3 = gdb_regs[BFIN_I3];
 135         regs->m0 = gdb_regs[BFIN_M0];
 136         regs->m1 = gdb_regs[BFIN_M1];
 137         regs->m2 = gdb_regs[BFIN_M2];
 138         regs->m3 = gdb_regs[BFIN_M3];
 139         regs->b0 = gdb_regs[BFIN_B0];
 140         regs->b1 = gdb_regs[BFIN_B1];
 141         regs->b2 = gdb_regs[BFIN_B2];
 142         regs->b3 = gdb_regs[BFIN_B3];
 143         regs->l0 = gdb_regs[BFIN_L0];
 144         regs->l1 = gdb_regs[BFIN_L1];
 145         regs->l2 = gdb_regs[BFIN_L2];
 146         regs->l3 = gdb_regs[BFIN_L3];
 147         regs->a0x = gdb_regs[BFIN_A0_DOT_X];
 148         regs->a0w = gdb_regs[BFIN_A0_DOT_W];
 149         regs->a1x = gdb_regs[BFIN_A1_DOT_X];
 150         regs->a1w = gdb_regs[BFIN_A1_DOT_W];
 151         regs->rets = gdb_regs[BFIN_RETS];
 152         regs->lc0 = gdb_regs[BFIN_LC0];
 153         regs->lt0 = gdb_regs[BFIN_LT0];
 154         regs->lb0 = gdb_regs[BFIN_LB0];
 155         regs->lc1 = gdb_regs[BFIN_LC1];
 156         regs->lt1 = gdb_regs[BFIN_LT1];
 157         regs->lb1 = gdb_regs[BFIN_LB1];
 158         regs->usp = gdb_regs[BFIN_USP];
 159         regs->syscfg = gdb_regs[BFIN_SYSCFG];
 160         regs->retx = gdb_regs[BFIN_PC];
 161         regs->retn = gdb_regs[BFIN_RETN];
 162         regs->rete = gdb_regs[BFIN_RETE];
 163         regs->pc = gdb_regs[BFIN_PC];
 164
 165 #if 0                           /* can't change these */
 166         regs->astat = gdb_regs[BFIN_ASTAT];
 167         regs->seqstat = gdb_regs[BFIN_SEQSTAT];
 168         regs->ipend = gdb_regs[BFIN_IPEND];
 169 #endif
 170 }
 171
 172 struct hw_breakpoint {
 173         unsigned int occupied:1;
 174         unsigned int skip:1;
 175         unsigned int enabled:1;
 176         unsigned int type:1;
 177         unsigned int dataacc:2;
 178         unsigned short count;
 179         unsigned int addr;
 180 } breakinfo[HW_WATCHPOINT_NUM];
 181
 182 int bfin_set_hw_break(unsigned long addr, int len, enum kgdb_bptype type)
 183 {
 184         int breakno;
 185         int bfin_type;
 186         int dataacc = 0;
 187
 188         switch (type) {
 189         case BP_HARDWARE_BREAKPOINT:
 190                 bfin_type = TYPE_INST_WATCHPOINT;
 191                 break;
 192         case BP_WRITE_WATCHPOINT:
 193                 dataacc = 1;
 194                 bfin_type = TYPE_DATA_WATCHPOINT;
 195                 break;
 196         case BP_READ_WATCHPOINT:
 197                 dataacc = 2;
 198                 bfin_type = TYPE_DATA_WATCHPOINT;
 199                 break;
 200         case BP_ACCESS_WATCHPOINT:
 201                 dataacc = 3;
 202                 bfin_type = TYPE_DATA_WATCHPOINT;
 203                 break;
 204         default:
 205                 return -ENOSPC;
 206         }
 207
 208         /* Becasue hardware data watchpoint impelemented in current
 209          * Blackfin can not trigger an exception event as the hardware
 210          * instrction watchpoint does, we ignaore all data watch point here.
 211          * They can be turned on easily after future blackfin design
 212          * supports this feature.
 213          */
 214         for (breakno = 0; breakno < HW_INST_WATCHPOINT_NUM; breakno++)
 215                 if (bfin_type == breakinfo[breakno].type
 216                         && !breakinfo[breakno].occupied) {
 217                         breakinfo[breakno].occupied = 1;
 218                         breakinfo[breakno].skip = 0;
 219                         breakinfo[breakno].enabled = 1;
 220                         breakinfo[breakno].addr = addr;
 221                         breakinfo[breakno].dataacc = dataacc;
 222                         breakinfo[breakno].count = 0;
 223                         return 0;
 224                 }
 225
 226         return -ENOSPC;
 227 }
 228
 229 int bfin_remove_hw_break(unsigned long addr, int len, enum kgdb_bptype type)
 230 {
 231         int breakno;
 232         int bfin_type;
 233
 234         switch (type) {
 235         case BP_HARDWARE_BREAKPOINT:
 236                 bfin_type = TYPE_INST_WATCHPOINT;
 237                 break;
 238         case BP_WRITE_WATCHPOINT:
 239         case BP_READ_WATCHPOINT:
 240         case BP_ACCESS_WATCHPOINT:
 241                 bfin_type = TYPE_DATA_WATCHPOINT;
 242                 break;
 243         default:
 244                 return 0;
 245         }
 246         for (breakno = 0; breakno < HW_WATCHPOINT_NUM; breakno++)
 247                 if (bfin_type == breakinfo[breakno].type
 248                         && breakinfo[breakno].occupied
 249                         && breakinfo[breakno].addr == addr) {
 250                         breakinfo[breakno].occupied = 0;
 251                         breakinfo[breakno].enabled = 0;
 252                 }
 253
 254         return 0;
 255 }
 256
 257 void bfin_remove_all_hw_break(void)
 258 {
 259         int breakno;
 260
 261         memset(breakinfo, 0, sizeof(struct hw_breakpoint)*HW_WATCHPOINT_NUM);
 262
 263         for (breakno = 0; breakno < HW_INST_WATCHPOINT_NUM; breakno++)
 264                 breakinfo[breakno].type = TYPE_INST_WATCHPOINT;
 265         for (; breakno < HW_WATCHPOINT_NUM; breakno++)
 266                 breakinfo[breakno].type = TYPE_DATA_WATCHPOINT;
 267 }
 268
 269 void bfin_correct_hw_break(void)
 270 {
 271         int breakno;
 272         unsigned int wpiactl = 0;
 273         unsigned int wpdactl = 0;
 274         int enable_wp = 0;
 275
 276         for (breakno = 0; breakno < HW_WATCHPOINT_NUM; breakno++)
 277                 if (breakinfo[breakno].enabled) {
 278                         enable_wp = 1;
 279
 280                         switch (breakno) {
 281                         case 0:
 282                                 wpiactl |= WPIAEN0|WPICNTEN0;
 283                                 bfin_write_WPIA0(breakinfo[breakno].addr);
 284                                 bfin_write_WPIACNT0(breakinfo[breakno].count
 285                                         + breakinfo->skip);
 286                                 break;
 287                         case 1:
 288                                 wpiactl |= WPIAEN1|WPICNTEN1;
 289                                 bfin_write_WPIA1(breakinfo[breakno].addr);
 290                                 bfin_write_WPIACNT1(breakinfo[breakno].count
 291                                         + breakinfo->skip);
 292                                 break;
 293                         case 2:
 294                                 wpiactl |= WPIAEN2|WPICNTEN2;
 295                                 bfin_write_WPIA2(breakinfo[breakno].addr);
 296                                 bfin_write_WPIACNT2(breakinfo[breakno].count
 297                                         + breakinfo->skip);
 298                                 break;
 299                         case 3:
 300                                 wpiactl |= WPIAEN3|WPICNTEN3;
 301                                 bfin_write_WPIA3(breakinfo[breakno].addr);
 302                                 bfin_write_WPIACNT3(breakinfo[breakno].count
 303                                         + breakinfo->skip);
 304                                 break;
 305                         case 4:
 306                                 wpiactl |= WPIAEN4|WPICNTEN4;
 307                                 bfin_write_WPIA4(breakinfo[breakno].addr);
 308                                 bfin_write_WPIACNT4(breakinfo[breakno].count
 309                                         + breakinfo->skip);
 310                                 break;
 311                         case 5:
 312                                 wpiactl |= WPIAEN5|WPICNTEN5;
 313                                 bfin_write_WPIA5(breakinfo[breakno].addr);
 314                                 bfin_write_WPIACNT5(breakinfo[breakno].count
 315                                         + breakinfo->skip);
 316                                 break;
 317                         case 6:
 318                                 wpdactl |= WPDAEN0|WPDCNTEN0|WPDSRC0;
 319                                 wpdactl |= breakinfo[breakno].dataacc
 320                                         << WPDACC0_OFFSET;
 321                                 bfin_write_WPDA0(breakinfo[breakno].addr);
 322                                 bfin_write_WPDACNT0(breakinfo[breakno].count
 323                                         + breakinfo->skip);
 324                                 break;
 325                         case 7:
 326                                 wpdactl |= WPDAEN1|WPDCNTEN1|WPDSRC1;
 327                                 wpdactl |= breakinfo[breakno].dataacc
 328                                         << WPDACC1_OFFSET;
 329                                 bfin_write_WPDA1(breakinfo[breakno].addr);
 330                                 bfin_write_WPDACNT1(breakinfo[breakno].count
 331                                         + breakinfo->skip);
 332                                 break;
 333                         }
 334                 }
 335
 336         /* Should enable WPPWR bit first before set any other
 337          * WPIACTL and WPDACTL bits */
 338         if (enable_wp) {
 339                 bfin_write_WPIACTL(WPPWR);
 340                 CSYNC();
 341                 bfin_write_WPIACTL(wpiactl|WPPWR);
 342                 bfin_write_WPDACTL(wpdactl);
 343                 CSYNC();
 344         }
 345 }
 346
 347 void kgdb_disable_hw_debug(struct pt_regs *regs)
 348 {
 349         /* Disable hardware debugging while we are in kgdb */
 350         bfin_write_WPIACTL(0);
 351         bfin_write_WPDACTL(0);
 352         CSYNC();
 353 }
 354
 355 #ifdef CONFIG_SMP
 356 void kgdb_passive_cpu_callback(void *info)
 357 {
 358         kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs());
 359 }
 360
 361 void kgdb_roundup_cpus(unsigned long flags)
 362 {
 363         smp_call_function(kgdb_passive_cpu_callback, NULL, 0);
 364 }
 365
 366 void kgdb_roundup_cpu(int cpu, unsigned long flags)
 367 {
 368         smp_call_function_single(cpu, kgdb_passive_cpu_callback, NULL, 0);
 369 }
 370 #endif
 371
 372 void kgdb_post_primary_code(struct pt_regs *regs, int eVector, int err_code)
 373 {
 374         /* Master processor is completely in the debugger */
 375         gdb_bfin_vector = eVector;
 376         gdb_bfin_errcode = err_code;
 377 }
 378
 379 int kgdb_arch_handle_exception(int vector, int signo,
 380                                int err_code, char *remcom_in_buffer,
 381                                char *remcom_out_buffer,
 382                                struct pt_regs *regs)
 383 {
 384         long addr;
 385         char *ptr;
 386         int newPC;
 387         int i;
 388
 389         switch (remcom_in_buffer[0]) {
 390         case 'c':
 391         case 's':
 392                 if (kgdb_contthread && kgdb_contthread != current) {
 393                         strcpy(remcom_out_buffer, "E00");
 394                         break;
 395                 }
 396
 397                 kgdb_contthread = NULL;
 398
 399                 /* try to read optional parameter, pc unchanged if no parm */
 400                 ptr = &remcom_in_buffer[1];
 401                 if (kgdb_hex2long(&ptr, &addr)) {
 402                         regs->retx = addr;
 403                 }
 404                 newPC = regs->retx;
 405
 406                 /* clear the trace bit */
 407                 regs->syscfg &= 0xfffffffe;
 408
 409                 /* set the trace bit if we're stepping */
 410                 if (remcom_in_buffer[0] == 's') {
 411                         regs->syscfg |= 0x1;
 412                         kgdb_single_step = regs->ipend;
 413                         kgdb_single_step >>= 6;
 414                         for (i = 10; i > 0; i--, kgdb_single_step >>= 1)
 415                                 if (kgdb_single_step & 1)
 416                                         break;
 417                         /* i indicate event priority of current stopped instruction
 418                          * user space instruction is 0, IVG15 is 1, IVTMR is 10.
 419                          * kgdb_single_step > 0 means in single step mode
 420                          */
 421                         kgdb_single_step = i + 1;
 422                 }
 423
 424                 bfin_correct_hw_break();
 425
 426                 return 0;
 427         }                       /* switch */
 428         return -1;              /* this means that we do not want to exit from the handler */
 429 }
 430
 431 struct kgdb_arch arch_kgdb_ops = {
 432         .gdb_bpt_instr = {0xa1},
 433 #ifdef CONFIG_SMP
 434         .flags = KGDB_HW_BREAKPOINT|KGDB_THR_PROC_SWAP,
 435 #else
 436         .flags = KGDB_HW_BREAKPOINT,
 437 #endif
 438         .set_hw_breakpoint = bfin_set_hw_break,
 439         .remove_hw_breakpoint = bfin_remove_hw_break,
 440         .remove_all_hw_break = bfin_remove_all_hw_break,
 441         .correct_hw_break = bfin_correct_hw_break,
 442 };
 443
 444 static int hex(char ch)
 445 {
 446         if ((ch >= 'a') && (ch <= 'f'))
 447                 return ch - 'a' + 10;
 448         if ((ch >= '0') && (ch <= '9'))
 449                 return ch - '0';
 450         if ((ch >= 'A') && (ch <= 'F'))
 451                 return ch - 'A' + 10;
 452         return -1;
 453 }
 454
 455 static int validate_memory_access_address(unsigned long addr, int size)
 456 {
 457         if (size < 0 || addr == 0)
 458                 return -EFAULT;
 459         return bfin_mem_access_type(addr, size);
 460 }
 461
 462 static int bfin_probe_kernel_read(char *dst, char *src, int size)
 463 {
 464         unsigned long lsrc = (unsigned long)src;
 465         int mem_type;
 466
 467         mem_type = validate_memory_access_address(lsrc, size);
 468         if (mem_type < 0)
 469                 return mem_type;
 470
 471         if (lsrc >= SYSMMR_BASE) {
 472                 if (size == 2 && lsrc % 2 == 0) {
 473                         u16 mmr = bfin_read16(src);
 474                         memcpy(dst, &mmr, sizeof(mmr));
 475                         return 0;
 476                 } else if (size == 4 && lsrc % 4 == 0) {
 477                         u32 mmr = bfin_read32(src);
 478                         memcpy(dst, &mmr, sizeof(mmr));
 479                         return 0;
 480                 }
 481         } else {
 482                 switch (mem_type) {
 483                         case BFIN_MEM_ACCESS_CORE:
 484                         case BFIN_MEM_ACCESS_CORE_ONLY:
 485                                 return probe_kernel_read(dst, src, size);
 486                         /* XXX: should support IDMA here with SMP */
 487                         case BFIN_MEM_ACCESS_DMA:
 488                                 if (dma_memcpy(dst, src, size))
 489                                         return 0;
 490                                 break;
 491                         case BFIN_MEM_ACCESS_ITEST:
 492                                 if (isram_memcpy(dst, src, size))
 493                                         return 0;
 494                                 break;
 495                 }
 496         }
 497
 498         return -EFAULT;
 499 }
 500
 501 static int bfin_probe_kernel_write(char *dst, char *src, int size)
 502 {
 503         unsigned long ldst = (unsigned long)dst;
 504         int mem_type;
 505
 506         mem_type = validate_memory_access_address(ldst, size);
 507         if (mem_type < 0)
 508                 return mem_type;
 509
 510         if (ldst >= SYSMMR_BASE) {
 511                 if (size == 2 && ldst % 2 == 0) {
 512                         u16 mmr;
 513                         memcpy(&mmr, src, sizeof(mmr));
 514                         bfin_write16(dst, mmr);
 515                         return 0;
 516                 } else if (size == 4 && ldst % 4 == 0) {
 517                         u32 mmr;
 518                         memcpy(&mmr, src, sizeof(mmr));
 519                         bfin_write32(dst, mmr);
 520                         return 0;
 521                 }
 522         } else {
 523                 switch (mem_type) {
 524                         case BFIN_MEM_ACCESS_CORE:
 525                         case BFIN_MEM_ACCESS_CORE_ONLY:
 526                                 return probe_kernel_write(dst, src, size);
 527                         /* XXX: should support IDMA here with SMP */
 528                         case BFIN_MEM_ACCESS_DMA:
 529                                 if (dma_memcpy(dst, src, size))
 530                                         return 0;
 531                                 break;
 532                         case BFIN_MEM_ACCESS_ITEST:
 533                                 if (isram_memcpy(dst, src, size))
 534                                         return 0;
 535                                 break;
 536                 }
 537         }
 538
 539         return -EFAULT;
 540 }
 541
 542 /*
 543  * Convert the memory pointed to by mem into hex, placing result in buf.
 544  * Return a pointer to the last char put in buf (null). May return an error.
 545  */
 546 int kgdb_mem2hex(char *mem, char *buf, int count)
 547 {
 548         char *tmp;
 549         int err;
 550
 551         /*
 552          * We use the upper half of buf as an intermediate buffer for the
 553          * raw memory copy.  Hex conversion will work against this one.
 554          */
 555         tmp = buf + count;
 556
 557         err = bfin_probe_kernel_read(tmp, mem, count);
 558         if (!err) {
 559                 while (count > 0) {
 560                         buf = pack_hex_byte(buf, *tmp);
 561                         tmp++;
 562                         count--;
 563                 }
 564
 565                 *buf = 0;
 566         }
 567
 568         return err;
 569 }
 570
 571 /*
 572  * Copy the binary array pointed to by buf into mem.  Fix $, #, and
 573  * 0x7d escaped with 0x7d.  Return a pointer to the character after
 574  * the last byte written.
 575  */
 576 int kgdb_ebin2mem(char *buf, char *mem, int count)
 577 {
 578         char *tmp_old, *tmp_new;
 579         int size;
 580
 581         tmp_old = tmp_new = buf;
 582
 583         for (size = 0; size < count; ++size) {
 584                 if (*tmp_old == 0x7d)
 585                         *tmp_new = *(++tmp_old) ^ 0x20;
 586                 else
 587                         *tmp_new = *tmp_old;
 588                 tmp_new++;
 589                 tmp_old++;
 590         }
 591
 592         return bfin_probe_kernel_write(mem, buf, count);
 593 }
 594
 595 /*
 596  * Convert the hex array pointed to by buf into binary to be placed in mem.
 597  * Return a pointer to the character AFTER the last byte written.
 598  * May return an error.
 599  */
 600 int kgdb_hex2mem(char *buf, char *mem, int count)
 601 {
 602         char *tmp_raw, *tmp_hex;
 603
 604         /*
 605          * We use the upper half of buf as an intermediate buffer for the
 606          * raw memory that is converted from hex.
 607          */
 608         tmp_raw = buf + count * 2;
 609
 610         tmp_hex = tmp_raw - 1;
 611         while (tmp_hex >= buf) {
 612                 tmp_raw--;
 613                 *tmp_raw = hex(*tmp_hex--);
 614                 *tmp_raw |= hex(*tmp_hex--) << 4;
 615         }
 616
 617         return bfin_probe_kernel_write(mem, tmp_raw, count);
 618 }
 619
 620 #define IN_MEM(addr, size, l1_addr, l1_size) \
 621 ({ \
 622         unsigned long __addr = (unsigned long)(addr); \
 623         (l1_size && __addr >= l1_addr && __addr + (size) <= l1_addr + l1_size); \
 624 })
 625 #define ASYNC_BANK_SIZE \
 626         (ASYNC_BANK0_SIZE + ASYNC_BANK1_SIZE + \
 627          ASYNC_BANK2_SIZE + ASYNC_BANK3_SIZE)
 628
 629 int kgdb_validate_break_address(unsigned long addr)
 630 {
 631         int cpu = raw_smp_processor_id();
 632
 633         if (addr >= 0x1000 && (addr + BREAK_INSTR_SIZE) <= physical_mem_end)
 634                 return 0;
 635         if (IN_MEM(addr, BREAK_INSTR_SIZE, ASYNC_BANK0_BASE, ASYNC_BANK_SIZE))
 636                 return 0;
 637         if (cpu == 0 && IN_MEM(addr, BREAK_INSTR_SIZE, L1_CODE_START, L1_CODE_LENGTH))
 638                 return 0;
 639 #ifdef CONFIG_SMP
 640         else if (cpu == 1 && IN_MEM(addr, BREAK_INSTR_SIZE, COREB_L1_CODE_START, L1_CODE_LENGTH))
 641                 return 0;
 642 #endif
 643         if (IN_MEM(addr, BREAK_INSTR_SIZE, L2_START, L2_LENGTH))
 644                 return 0;
 645
 646         return -EFAULT;
 647 }
 648
 649 int kgdb_arch_set_breakpoint(unsigned long addr, char *saved_instr)
 650 {
 651         int err = bfin_probe_kernel_read(saved_instr, (char *)addr,
 652                                          BREAK_INSTR_SIZE);
 653         if (err)
 654                 return err;
 655         return bfin_probe_kernel_write((char *)addr, arch_kgdb_ops.gdb_bpt_instr,
 656                                        BREAK_INSTR_SIZE);
 657 }
 658
 659 int kgdb_arch_remove_breakpoint(unsigned long addr, char *bundle)
 660 {
 661         return bfin_probe_kernel_write((char *)addr, bundle, BREAK_INSTR_SIZE);
 662 }
 663
 664 int kgdb_arch_init(void)
 665 {
 666         kgdb_single_step = 0;
 667
 668         bfin_remove_all_hw_break();
 669         return 0;
 670 }
 671
 672 void kgdb_arch_exit(void)
 673 {
 674 }