The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/db_trace.c

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    1 /*-
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990 Carnegie Mellon University
    4  * All Rights Reserved.
    5  *
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  *
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  *
   16  * Carnegie Mellon requests users of this software to return to
   17  *
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  *
   23  * any improvements or extensions that they make and grant Carnegie the
   24  * rights to redistribute these changes.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: src/sys/i386/i386/db_trace.c,v 1.61.2.4 2005/03/25 21:07:21 jhb Exp $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kdb.h>
   33 #include <sys/proc.h>
   34 #include <sys/sysent.h>
   35 
   36 #include <machine/cpu.h>
   37 #include <machine/md_var.h>
   38 #include <machine/pcb.h>
   39 #include <machine/reg.h>
   40 
   41 #include <vm/vm.h>
   42 #include <vm/vm_param.h>
   43 #include <vm/pmap.h>
   44 
   45 #include <ddb/ddb.h>
   46 #include <ddb/db_access.h>
   47 #include <ddb/db_sym.h>
   48 #include <ddb/db_variables.h>
   49 
   50 static db_varfcn_t db_dr0;
   51 static db_varfcn_t db_dr1;
   52 static db_varfcn_t db_dr2;
   53 static db_varfcn_t db_dr3;
   54 static db_varfcn_t db_dr4;
   55 static db_varfcn_t db_dr5;
   56 static db_varfcn_t db_dr6;
   57 static db_varfcn_t db_dr7;
   58 static db_varfcn_t db_esp;
   59 static db_varfcn_t db_frame;
   60 static db_varfcn_t db_ss;
   61 
   62 /*
   63  * Machine register set.
   64  */
   65 #define DB_OFFSET(x)    (db_expr_t *)offsetof(struct trapframe, x)
   66 struct db_variable db_regs[] = {
   67         { "cs",         DB_OFFSET(tf_cs),       db_frame },
   68         { "ds",         DB_OFFSET(tf_ds),       db_frame },
   69         { "es",         DB_OFFSET(tf_es),       db_frame },
   70         { "fs",         DB_OFFSET(tf_fs),       db_frame },
   71         { "ss",         NULL,                   db_ss },
   72         { "eax",        DB_OFFSET(tf_eax),      db_frame },
   73         { "ecx",        DB_OFFSET(tf_ecx),      db_frame },
   74         { "edx",        DB_OFFSET(tf_edx),      db_frame },
   75         { "ebx",        DB_OFFSET(tf_ebx),      db_frame },
   76         { "esp",        NULL,                   db_esp },
   77         { "ebp",        DB_OFFSET(tf_ebp),      db_frame },
   78         { "esi",        DB_OFFSET(tf_esi),      db_frame },
   79         { "edi",        DB_OFFSET(tf_edi),      db_frame },
   80         { "eip",        DB_OFFSET(tf_eip),      db_frame },
   81         { "efl",        DB_OFFSET(tf_eflags),   db_frame },
   82         { "dr0",        NULL,                   db_dr0 },
   83         { "dr1",        NULL,                   db_dr1 },
   84         { "dr2",        NULL,                   db_dr2 },
   85         { "dr3",        NULL,                   db_dr3 },
   86         { "dr4",        NULL,                   db_dr4 },
   87         { "dr5",        NULL,                   db_dr5 },
   88         { "dr6",        NULL,                   db_dr6 },
   89         { "dr7",        NULL,                   db_dr7 },
   90 };
   91 struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]);
   92 
   93 #define DB_DRX_FUNC(reg)                \
   94 static int                              \
   95 db_ ## reg (vp, valuep, op)             \
   96         struct db_variable *vp;         \
   97         db_expr_t * valuep;             \
   98         int op;                         \
   99 {                                       \
  100         if (op == DB_VAR_GET)           \
  101                 *valuep = r ## reg ();  \
  102         else                            \
  103                 load_ ## reg (*valuep); \
  104         return (1);                     \
  105 }
  106 
  107 DB_DRX_FUNC(dr0)
  108 DB_DRX_FUNC(dr1)
  109 DB_DRX_FUNC(dr2)
  110 DB_DRX_FUNC(dr3)
  111 DB_DRX_FUNC(dr4)
  112 DB_DRX_FUNC(dr5)
  113 DB_DRX_FUNC(dr6)
  114 DB_DRX_FUNC(dr7)
  115 
  116 static __inline int
  117 get_esp(struct trapframe *tf)
  118 {
  119         return ((ISPL(tf->tf_cs)) ? tf->tf_esp :
  120             (db_expr_t)tf + (uintptr_t)DB_OFFSET(tf_esp));
  121 }
  122 
  123 static int
  124 db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
  125 {
  126         int *reg;
  127 
  128         if (kdb_frame == NULL)
  129                 return (0);
  130 
  131         reg = (int *)((uintptr_t)kdb_frame + (db_expr_t)vp->valuep);
  132         if (op == DB_VAR_GET)
  133                 *valuep = *reg;
  134         else
  135                 *reg = *valuep;
  136         return (1);
  137 }
  138 
  139 static int
  140 db_esp(struct db_variable *vp, db_expr_t *valuep, int op)
  141 {
  142 
  143         if (kdb_frame == NULL)
  144                 return (0);
  145 
  146         if (op == DB_VAR_GET)
  147                 *valuep = get_esp(kdb_frame);
  148         else if (ISPL(kdb_frame->tf_cs))
  149                 kdb_frame->tf_esp = *valuep;
  150         return (1);
  151 }
  152 
  153 static int
  154 db_ss(struct db_variable *vp, db_expr_t *valuep, int op)
  155 {
  156 
  157         if (kdb_frame == NULL)
  158                 return (0);
  159 
  160         if (op == DB_VAR_GET)
  161                 *valuep = (ISPL(kdb_frame->tf_cs)) ? kdb_frame->tf_ss : rss();
  162         else if (ISPL(kdb_frame->tf_cs))
  163                 kdb_frame->tf_ss = *valuep;
  164         return (1);
  165 }
  166 
  167 /*
  168  * Stack trace.
  169  */
  170 #define INKERNEL(va)    (((vm_offset_t)(va)) >= USRSTACK)
  171 
  172 struct i386_frame {
  173         struct i386_frame       *f_frame;
  174         int                     f_retaddr;
  175         int                     f_arg0;
  176 };
  177 
  178 #define NORMAL          0
  179 #define TRAP            1
  180 #define INTERRUPT       2
  181 #define SYSCALL         3
  182 #define DOUBLE_FAULT    4
  183 
  184 static void db_nextframe(struct i386_frame **, db_addr_t *, struct thread *);
  185 static int db_numargs(struct i386_frame *);
  186 static void db_print_stack_entry(const char *, int, char **, int *, db_addr_t);
  187 static void decode_syscall(int, struct thread *);
  188 
  189 static char * watchtype_str(int type);
  190 int  i386_set_watch(int watchnum, unsigned int watchaddr, int size, int access,
  191                     struct dbreg * d);
  192 int  i386_clr_watch(int watchnum, struct dbreg * d);
  193 int  db_md_set_watchpoint(db_expr_t addr, db_expr_t size);
  194 int  db_md_clr_watchpoint(db_expr_t addr, db_expr_t size);
  195 void db_md_list_watchpoints(void);
  196 
  197 /*
  198  * Figure out how many arguments were passed into the frame at "fp".
  199  */
  200 static int
  201 db_numargs(fp)
  202         struct i386_frame *fp;
  203 {
  204         int     *argp;
  205         int     inst;
  206         int     args;
  207 
  208         argp = (int *)db_get_value((int)&fp->f_retaddr, 4, FALSE);
  209         /*
  210          * XXX etext is wrong for LKMs.  We should attempt to interpret
  211          * the instruction at the return address in all cases.  This
  212          * may require better fault handling.
  213          */
  214         if (argp < (int *)btext || argp >= (int *)etext) {
  215                 args = 5;
  216         } else {
  217                 inst = db_get_value((int)argp, 4, FALSE);
  218                 if ((inst & 0xff) == 0x59)      /* popl %ecx */
  219                         args = 1;
  220                 else if ((inst & 0xffff) == 0xc483)     /* addl $Ibs, %esp */
  221                         args = ((inst >> 16) & 0xff) / 4;
  222                 else
  223                         args = 5;
  224         }
  225         return (args);
  226 }
  227 
  228 static void
  229 db_print_stack_entry(name, narg, argnp, argp, callpc)
  230         const char *name;
  231         int narg;
  232         char **argnp;
  233         int *argp;
  234         db_addr_t callpc;
  235 {
  236         db_printf("%s(", name);
  237         while (narg) {
  238                 if (argnp)
  239                         db_printf("%s=", *argnp++);
  240                 db_printf("%r", db_get_value((int)argp, 4, FALSE));
  241                 argp++;
  242                 if (--narg != 0)
  243                         db_printf(",");
  244         }
  245         db_printf(") at ");
  246         db_printsym(callpc, DB_STGY_PROC);
  247         db_printf("\n");
  248 }
  249 
  250 static void
  251 decode_syscall(int number, struct thread *td)
  252 {
  253         struct proc *p;
  254         c_db_sym_t sym;
  255         db_expr_t diff;
  256         sy_call_t *f;
  257         const char *symname;
  258 
  259         db_printf(" (%d", number);
  260         p = (td != NULL) ? td->td_proc : NULL;
  261         if (p != NULL && 0 <= number && number < p->p_sysent->sv_size) {
  262                 f = p->p_sysent->sv_table[number].sy_call;
  263                 sym = db_search_symbol((db_addr_t)f, DB_STGY_ANY, &diff);
  264                 if (sym != DB_SYM_NULL && diff == 0) {
  265                         db_symbol_values(sym, &symname, NULL);
  266                         db_printf(", %s, %s", p->p_sysent->sv_name, symname);
  267                 }
  268         }
  269         db_printf(")");
  270 }
  271 
  272 /*
  273  * Figure out the next frame up in the call stack.
  274  */
  275 static void
  276 db_nextframe(struct i386_frame **fp, db_addr_t *ip, struct thread *td)
  277 {
  278         struct trapframe *tf;
  279         int frame_type;
  280         int eip, esp, ebp;
  281         db_expr_t offset;
  282         c_db_sym_t sym;
  283         const char *name;
  284 
  285         eip = db_get_value((int) &(*fp)->f_retaddr, 4, FALSE);
  286         ebp = db_get_value((int) &(*fp)->f_frame, 4, FALSE);
  287 
  288         /*
  289          * Figure out frame type.  We look at the address just before
  290          * the saved instruction pointer as the saved EIP is after the
  291          * call function, and if the function being called is marked as
  292          * dead (such as panic() at the end of dblfault_handler()), then
  293          * the instruction at the saved EIP will be part of a different
  294          * function (syscall() in this example) rather than the one that
  295          * actually made the call.
  296          */
  297         frame_type = NORMAL;
  298         sym = db_search_symbol(eip - 1, DB_STGY_ANY, &offset);
  299         db_symbol_values(sym, &name, NULL);
  300         if (name != NULL) {
  301                 if (strcmp(name, "calltrap") == 0 ||
  302                     strcmp(name, "fork_trampoline") == 0)
  303                         frame_type = TRAP;
  304                 else if (strncmp(name, "Xatpic_intr", 11) == 0 ||
  305                     strncmp(name, "Xapic_isr", 9) == 0)
  306                         frame_type = INTERRUPT;
  307                 else if (strcmp(name, "Xlcall_syscall") == 0 ||
  308                     strcmp(name, "Xint0x80_syscall") == 0)
  309                         frame_type = SYSCALL;
  310                 else if (strcmp(name, "dblfault_handler") == 0)
  311                         frame_type = DOUBLE_FAULT;
  312         }
  313 
  314         /*
  315          * Normal frames need no special processing.
  316          */
  317         if (frame_type == NORMAL) {
  318                 *ip = (db_addr_t) eip;
  319                 *fp = (struct i386_frame *) ebp;
  320                 return;
  321         }
  322 
  323         db_print_stack_entry(name, 0, 0, 0, eip);
  324 
  325         /*
  326          * For a double fault, we have to snag the values from the
  327          * previous TSS since a double fault uses a task gate to
  328          * switch to a known good state.
  329          */
  330         if (frame_type == DOUBLE_FAULT) {
  331                 esp = PCPU_GET(common_tss.tss_esp);
  332                 eip = PCPU_GET(common_tss.tss_eip);
  333                 ebp = PCPU_GET(common_tss.tss_ebp);
  334                 db_printf(
  335                     "--- trap 0x17, eip = %#r, esp = %#r, ebp = %#r ---\n",
  336                     eip, esp, ebp);
  337                 *ip = (db_addr_t) eip;
  338                 *fp = (struct i386_frame *) ebp;
  339                 return;
  340         }
  341 
  342         /*
  343          * Point to base of trapframe which is just above the
  344          * current frame.
  345          */
  346         if (frame_type == INTERRUPT)
  347                 tf = (struct trapframe *)((int)*fp + 12);
  348         else
  349                 tf = (struct trapframe *)((int)*fp + 8);
  350 
  351         if (INKERNEL((int) tf)) {
  352                 esp = get_esp(tf);
  353                 eip = tf->tf_eip;
  354                 ebp = tf->tf_ebp;
  355                 switch (frame_type) {
  356                 case TRAP:
  357                         db_printf("--- trap %#r", tf->tf_trapno);
  358                         break;
  359                 case SYSCALL:
  360                         db_printf("--- syscall");
  361                         decode_syscall(tf->tf_eax, td);
  362                         break;
  363                 case INTERRUPT:
  364                         db_printf("--- interrupt");
  365                         break;
  366                 default:
  367                         panic("The moon has moved again.");
  368                 }
  369                 db_printf(", eip = %#r, esp = %#r, ebp = %#r ---\n", eip,
  370                     esp, ebp);
  371         }
  372 
  373         *ip = (db_addr_t) eip;
  374         *fp = (struct i386_frame *) ebp;
  375 }
  376 
  377 static int
  378 db_backtrace(struct thread *td, struct trapframe *tf, struct i386_frame *frame,
  379     db_addr_t pc, int count)
  380 {
  381         struct i386_frame *actframe;
  382 #define MAXNARG 16
  383         char *argnames[MAXNARG], **argnp = NULL;
  384         const char *name;
  385         int *argp;
  386         db_expr_t offset;
  387         c_db_sym_t sym;
  388         int narg, quit;
  389         boolean_t first;
  390 
  391         if (count == -1)
  392                 count = 1024;
  393 
  394         first = TRUE;
  395         quit = 0;
  396         db_setup_paging(db_simple_pager, &quit, db_lines_per_page);
  397         while (count-- && !quit) {
  398                 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
  399                 db_symbol_values(sym, &name, NULL);
  400 
  401                 /*
  402                  * Attempt to determine a (possibly fake) frame that gives
  403                  * the caller's pc.  It may differ from `frame' if the
  404                  * current function never sets up a standard frame or hasn't
  405                  * set one up yet or has just discarded one.  The last two
  406                  * cases can be guessed fairly reliably for code generated
  407                  * by gcc.  The first case is too much trouble to handle in
  408                  * general because the amount of junk on the stack depends
  409                  * on the pc (the special handling of "calltrap", etc. in
  410                  * db_nextframe() works because the `next' pc is special).
  411                  */
  412                 actframe = frame;
  413                 if (first) {
  414                         if (tf != NULL) {
  415                                 int instr;
  416 
  417                                 instr = db_get_value(pc, 4, FALSE);
  418                                 if ((instr & 0xffffff) == 0x00e58955) {
  419                                         /* pushl %ebp; movl %esp, %ebp */
  420                                         actframe = (void *)(get_esp(tf) - 4);
  421                                 } else if ((instr & 0xffff) == 0x0000e589) {
  422                                         /* movl %esp, %ebp */
  423                                         actframe = (void *)get_esp(tf);
  424                                         if (tf->tf_ebp == 0) {
  425                                                 /* Fake frame better. */
  426                                                 frame = actframe;
  427                                         }
  428                                 } else if ((instr & 0xff) == 0x000000c3) {
  429                                         /* ret */
  430                                         actframe = (void *)(get_esp(tf) - 4);
  431                                 } else if (offset == 0) {
  432                                         /* Probably an assembler symbol. */
  433                                         actframe = (void *)(get_esp(tf) - 4);
  434                                 }
  435                         } else if (strcmp(name, "fork_trampoline") == 0) {
  436                                 /*
  437                                  * Don't try to walk back on a stack for a
  438                                  * process that hasn't actually been run yet.
  439                                  */
  440                                 db_print_stack_entry(name, 0, 0, 0, pc);
  441                                 break;
  442                         }
  443                         first = FALSE;
  444                 }
  445 
  446                 argp = &actframe->f_arg0;
  447                 narg = MAXNARG;
  448                 if (sym != NULL && db_sym_numargs(sym, &narg, argnames)) {
  449                         argnp = argnames;
  450                 } else {
  451                         narg = db_numargs(frame);
  452                 }
  453 
  454                 db_print_stack_entry(name, narg, argnp, argp, pc);
  455 
  456                 if (actframe != frame) {
  457                         /* `frame' belongs to caller. */
  458                         pc = (db_addr_t)
  459                             db_get_value((int)&actframe->f_retaddr, 4, FALSE);
  460                         continue;
  461                 }
  462 
  463                 db_nextframe(&frame, &pc, td);
  464 
  465                 if (INKERNEL((int)pc) && !INKERNEL((int) frame)) {
  466                         sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
  467                         db_symbol_values(sym, &name, NULL);
  468                         db_print_stack_entry(name, 0, 0, 0, pc);
  469                         break;
  470                 }
  471                 if (!INKERNEL((int) frame)) {
  472                         break;
  473                 }
  474         }
  475 
  476         return (0);
  477 }
  478 
  479 void
  480 db_trace_self(void)
  481 {
  482         struct i386_frame *frame;
  483         db_addr_t callpc;
  484         register_t ebp;
  485 
  486         __asm __volatile("movl %%ebp,%0" : "=r" (ebp));
  487         frame = (struct i386_frame *)ebp;
  488         callpc = (db_addr_t)db_get_value((int)&frame->f_retaddr, 4, FALSE);
  489         frame = frame->f_frame;
  490         db_backtrace(curthread, NULL, frame, callpc, -1);
  491 }
  492 
  493 int
  494 db_trace_thread(struct thread *thr, int count)
  495 {
  496         struct pcb *ctx;
  497 
  498         ctx = kdb_thr_ctx(thr);
  499         return (db_backtrace(thr, NULL, (struct i386_frame *)ctx->pcb_ebp,
  500                     ctx->pcb_eip, count));
  501 }
  502 
  503 int
  504 i386_set_watch(watchnum, watchaddr, size, access, d)
  505         int watchnum;
  506         unsigned int watchaddr;
  507         int size;
  508         int access;
  509         struct dbreg * d;
  510 {
  511         int i;
  512         unsigned int mask;
  513         
  514         if (watchnum == -1) {
  515                 for (i = 0, mask = 0x3; i < 4; i++, mask <<= 2)
  516                         if ((d->dr[7] & mask) == 0)
  517                                 break;
  518                 if (i < 4)
  519                         watchnum = i;
  520                 else
  521                         return (-1);
  522         }
  523         
  524         switch (access) {
  525         case DBREG_DR7_EXEC:
  526                 size = 1; /* size must be 1 for an execution breakpoint */
  527                 /* fall through */
  528         case DBREG_DR7_WRONLY:
  529         case DBREG_DR7_RDWR:
  530                 break;
  531         default : return (-1);
  532         }
  533         
  534         /*
  535          * we can watch a 1, 2, or 4 byte sized location
  536          */
  537         switch (size) {
  538         case 1  : mask = 0x00; break;
  539         case 2  : mask = 0x01 << 2; break;
  540         case 4  : mask = 0x03 << 2; break;
  541         default : return (-1);
  542         }
  543 
  544         mask |= access;
  545 
  546         /* clear the bits we are about to affect */
  547         d->dr[7] &= ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16)));
  548 
  549         /* set drN register to the address, N=watchnum */
  550         DBREG_DRX(d,watchnum) = watchaddr;
  551 
  552         /* enable the watchpoint */
  553         d->dr[7] |= (0x2 << (watchnum*2)) | (mask << (watchnum*4+16));
  554 
  555         return (watchnum);
  556 }
  557 
  558 
  559 int
  560 i386_clr_watch(watchnum, d)
  561         int watchnum;
  562         struct dbreg * d;
  563 {
  564 
  565         if (watchnum < 0 || watchnum >= 4)
  566                 return (-1);
  567         
  568         d->dr[7] = d->dr[7] & ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16)));
  569         DBREG_DRX(d,watchnum) = 0;
  570         
  571         return (0);
  572 }
  573 
  574 
  575 int
  576 db_md_set_watchpoint(addr, size)
  577         db_expr_t addr;
  578         db_expr_t size;
  579 {
  580         int avail, wsize;
  581         int i;
  582         struct dbreg d;
  583         
  584         fill_dbregs(NULL, &d);
  585         
  586         avail = 0;
  587         for(i=0; i<4; i++) {
  588                 if ((d.dr[7] & (3 << (i*2))) == 0)
  589                         avail++;
  590         }
  591         
  592         if (avail*4 < size)
  593                 return (-1);
  594         
  595         for (i=0; i<4 && (size != 0); i++) {
  596                 if ((d.dr[7] & (3<<(i*2))) == 0) {
  597                         if (size > 4)
  598                                 wsize = 4;
  599                         else
  600                                 wsize = size;
  601                         if (wsize == 3)
  602                                 wsize++;
  603                         i386_set_watch(i, addr, wsize, 
  604                                        DBREG_DR7_WRONLY, &d);
  605                         addr += wsize;
  606                         size -= wsize;
  607                 }
  608         }
  609         
  610         set_dbregs(NULL, &d);
  611         
  612         return(0);
  613 }
  614 
  615 
  616 int
  617 db_md_clr_watchpoint(addr, size)
  618         db_expr_t addr;
  619         db_expr_t size;
  620 {
  621         int i;
  622         struct dbreg d;
  623 
  624         fill_dbregs(NULL, &d);
  625 
  626         for(i=0; i<4; i++) {
  627                 if (d.dr[7] & (3 << (i*2))) {
  628                         if ((DBREG_DRX((&d), i) >= addr) && 
  629                             (DBREG_DRX((&d), i) < addr+size))
  630                                 i386_clr_watch(i, &d);
  631                         
  632                 }
  633         }
  634         
  635         set_dbregs(NULL, &d);
  636         
  637         return(0);
  638 }
  639 
  640 
  641 static 
  642 char *
  643 watchtype_str(type)
  644         int type;
  645 {
  646         switch (type) {
  647                 case DBREG_DR7_EXEC   : return "execute";    break;
  648                 case DBREG_DR7_RDWR   : return "read/write"; break;
  649                 case DBREG_DR7_WRONLY : return "write";      break;
  650                 default               : return "invalid";    break;
  651         }
  652 }
  653 
  654 
  655 void
  656 db_md_list_watchpoints()
  657 {
  658         int i;
  659         struct dbreg d;
  660 
  661         fill_dbregs(NULL, &d);
  662 
  663         db_printf("\nhardware watchpoints:\n");
  664         db_printf("  watch    status        type  len     address\n");
  665         db_printf("  -----  --------  ----------  ---  ----------\n");
  666         for (i=0; i<4; i++) {
  667                 if (d.dr[7] & (0x03 << (i*2))) {
  668                         unsigned type, len;
  669                         type = (d.dr[7] >> (16+(i*4))) & 3;
  670                         len =  (d.dr[7] >> (16+(i*4)+2)) & 3;
  671                         db_printf("  %-5d  %-8s  %10s  %3d  0x%08x\n",
  672                                   i, "enabled", watchtype_str(type), 
  673                                   len+1, DBREG_DRX((&d),i));
  674                 }
  675                 else {
  676                         db_printf("  %-5d  disabled\n", i);
  677                 }
  678         }
  679         
  680         db_printf("\ndebug register values:\n");
  681         for (i=0; i<8; i++) {
  682                 db_printf("  dr%d 0x%08x\n", i, DBREG_DRX((&d),i));
  683         }
  684         db_printf("\n");
  685 }
  686 
  687 

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