The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/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: releng/5.4/sys/amd64/amd64/db_trace.c 145335 2005-04-20 19:11:07Z cvs2svn $");
   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_frame;
   59 static db_varfcn_t db_rsp;
   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 #if 0
   69         { "ds",         DB_OFFSET(tf_ds),       db_frame },
   70         { "es",         DB_OFFSET(tf_es),       db_frame },
   71         { "fs",         DB_OFFSET(tf_fs),       db_frame },
   72         { "gs",         DB_OFFSET(tf_gs),       db_frame },
   73 #endif
   74         { "ss",         NULL,                   db_ss },
   75         { "rax",        DB_OFFSET(tf_rax),      db_frame },
   76         { "rcx",        DB_OFFSET(tf_rcx),      db_frame },
   77         { "rdx",        DB_OFFSET(tf_rdx),      db_frame },
   78         { "rbx",        DB_OFFSET(tf_rbx),      db_frame },
   79         { "rsp",        NULL,                   db_rsp },
   80         { "rbp",        DB_OFFSET(tf_rbp),      db_frame },
   81         { "rsi",        DB_OFFSET(tf_rsi),      db_frame },
   82         { "rdi",        DB_OFFSET(tf_rdi),      db_frame },
   83         { "r8",         DB_OFFSET(tf_r8),       db_frame },
   84         { "r9",         DB_OFFSET(tf_r9),       db_frame },
   85         { "r10",        DB_OFFSET(tf_r10),      db_frame },
   86         { "r11",        DB_OFFSET(tf_r11),      db_frame },
   87         { "r12",        DB_OFFSET(tf_r12),      db_frame },
   88         { "r13",        DB_OFFSET(tf_r13),      db_frame },
   89         { "r14",        DB_OFFSET(tf_r14),      db_frame },
   90         { "r15",        DB_OFFSET(tf_r15),      db_frame },
   91         { "rip",        DB_OFFSET(tf_rip),      db_frame },
   92         { "rflags",     DB_OFFSET(tf_rflags),   db_frame },
   93         { "dr0",        NULL,                   db_dr0 },
   94         { "dr1",        NULL,                   db_dr1 },
   95         { "dr2",        NULL,                   db_dr2 },
   96         { "dr3",        NULL,                   db_dr3 },
   97         { "dr4",        NULL,                   db_dr4 },
   98         { "dr5",        NULL,                   db_dr5 },
   99         { "dr6",        NULL,                   db_dr6 },
  100         { "dr7",        NULL,                   db_dr7 },
  101 };
  102 struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]);
  103 
  104 #define DB_DRX_FUNC(reg)                \
  105 static int                              \
  106 db_ ## reg (vp, valuep, op)             \
  107         struct db_variable *vp;         \
  108         db_expr_t * valuep;             \
  109         int op;                         \
  110 {                                       \
  111         if (op == DB_VAR_GET)           \
  112                 *valuep = r ## reg ();  \
  113         else                            \
  114                 load_ ## reg (*valuep); \
  115         return (1);                     \
  116 }
  117 
  118 DB_DRX_FUNC(dr0)
  119 DB_DRX_FUNC(dr1)
  120 DB_DRX_FUNC(dr2)
  121 DB_DRX_FUNC(dr3)
  122 DB_DRX_FUNC(dr4)
  123 DB_DRX_FUNC(dr5)
  124 DB_DRX_FUNC(dr6)
  125 DB_DRX_FUNC(dr7)
  126 
  127 static __inline long
  128 get_rsp(struct trapframe *tf)
  129 {
  130         return ((ISPL(tf->tf_cs)) ? tf->tf_rsp :
  131             (db_expr_t)tf + offsetof(struct trapframe, tf_rsp));
  132 }
  133 
  134 static int
  135 db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
  136 {
  137         long *reg;
  138 
  139         if (kdb_frame == NULL)
  140                 return (0);
  141 
  142         reg = (long *)((uintptr_t)kdb_frame + (db_expr_t)vp->valuep);
  143         if (op == DB_VAR_GET)
  144                 *valuep = *reg;
  145         else
  146                 *reg = *valuep;
  147         return (1);
  148 }
  149 
  150 static int
  151 db_rsp(struct db_variable *vp, db_expr_t *valuep, int op)
  152 {
  153 
  154         if (kdb_frame == NULL)
  155                 return (0);
  156 
  157         if (op == DB_VAR_GET)
  158                 *valuep = get_rsp(kdb_frame);
  159         else if (ISPL(kdb_frame->tf_cs))
  160                 kdb_frame->tf_rsp = *valuep;
  161         return (1);
  162 }
  163 
  164 static int
  165 db_ss(struct db_variable *vp, db_expr_t *valuep, int op)
  166 {
  167 
  168         if (kdb_frame == NULL)
  169                 return (0);
  170 
  171         if (op == DB_VAR_GET)
  172                 *valuep = (ISPL(kdb_frame->tf_cs)) ? kdb_frame->tf_ss : rss();
  173         else if (ISPL(kdb_frame->tf_cs))
  174                 kdb_frame->tf_ss = *valuep;
  175         return (1);
  176 }
  177 
  178 /*
  179  * Stack trace.
  180  */
  181 #define INKERNEL(va)    (((vm_offset_t)(va)) >= USRSTACK)
  182 
  183 struct amd64_frame {
  184         struct amd64_frame      *f_frame;
  185         long                    f_retaddr;
  186         long                    f_arg0;
  187 };
  188 
  189 #define NORMAL          0
  190 #define TRAP            1
  191 #define INTERRUPT       2
  192 #define SYSCALL         3
  193 
  194 static void db_nextframe(struct amd64_frame **, db_addr_t *, struct thread *);
  195 static int db_numargs(struct amd64_frame *);
  196 static void db_print_stack_entry(const char *, int, char **, long *, db_addr_t);
  197 static void decode_syscall(int, struct thread *);
  198 
  199 static char * watchtype_str(int type);
  200 int  amd64_set_watch(int watchnum, unsigned int watchaddr, int size, int access,
  201                     struct dbreg * d);
  202 int  amd64_clr_watch(int watchnum, struct dbreg * d);
  203 int  db_md_set_watchpoint(db_expr_t addr, db_expr_t size);
  204 int  db_md_clr_watchpoint(db_expr_t addr, db_expr_t size);
  205 void db_md_list_watchpoints(void);
  206 
  207 /*
  208  * Figure out how many arguments were passed into the frame at "fp".
  209  */
  210 static int
  211 db_numargs(fp)
  212         struct amd64_frame *fp;
  213 {
  214 #if 1
  215         return (0);     /* regparm, needs dwarf2 info */
  216 #else
  217         long    *argp;
  218         int     inst;
  219         int     args;
  220 
  221         argp = (long *)db_get_value((long)&fp->f_retaddr, 8, FALSE);
  222         /*
  223          * XXX etext is wrong for LKMs.  We should attempt to interpret
  224          * the instruction at the return address in all cases.  This
  225          * may require better fault handling.
  226          */
  227         if (argp < (long *)btext || argp >= (long *)etext) {
  228                 args = 5;
  229         } else {
  230                 inst = db_get_value((long)argp, 4, FALSE);
  231                 if ((inst & 0xff) == 0x59)      /* popl %ecx */
  232                         args = 1;
  233                 else if ((inst & 0xffff) == 0xc483)     /* addl $Ibs, %esp */
  234                         args = ((inst >> 16) & 0xff) / 4;
  235                 else
  236                         args = 5;
  237         }
  238         return (args);
  239 #endif
  240 }
  241 
  242 static void
  243 db_print_stack_entry(name, narg, argnp, argp, callpc)
  244         const char *name;
  245         int narg;
  246         char **argnp;
  247         long *argp;
  248         db_addr_t callpc;
  249 {
  250         db_printf("%s(", name);
  251 #if 0
  252         while (narg) {
  253                 if (argnp)
  254                         db_printf("%s=", *argnp++);
  255                 db_printf("%lr", (long)db_get_value((long)argp, 8, FALSE));
  256                 argp++;
  257                 if (--narg != 0)
  258                         db_printf(",");
  259         }
  260 #endif
  261         db_printf(") at ");
  262         db_printsym(callpc, DB_STGY_PROC);
  263         db_printf("\n");
  264 }
  265 
  266 static void
  267 decode_syscall(int number, struct thread *td)
  268 {
  269         struct proc *p;
  270         c_db_sym_t sym;
  271         db_expr_t diff;
  272         sy_call_t *f;
  273         const char *symname;
  274 
  275         db_printf(" (%d", number);
  276         p = (td != NULL) ? td->td_proc : NULL;
  277         if (p != NULL && 0 <= number && number < p->p_sysent->sv_size) {
  278                 f = p->p_sysent->sv_table[number].sy_call;
  279                 sym = db_search_symbol((db_addr_t)f, DB_STGY_ANY, &diff);
  280                 if (sym != DB_SYM_NULL && diff == 0) {
  281                         db_symbol_values(sym, &symname, NULL);
  282                         db_printf(", %s, %s", p->p_sysent->sv_name, symname);
  283                 }
  284         }
  285         db_printf(")");
  286 }
  287 
  288 /*
  289  * Figure out the next frame up in the call stack.
  290  */
  291 static void
  292 db_nextframe(struct amd64_frame **fp, db_addr_t *ip, struct thread *td)
  293 {
  294         struct trapframe *tf;
  295         int frame_type;
  296         long rip, rsp, rbp;
  297         db_expr_t offset;
  298         c_db_sym_t sym;
  299         const char *name;
  300 
  301         rip = db_get_value((long) &(*fp)->f_retaddr, 8, FALSE);
  302         rbp = db_get_value((long) &(*fp)->f_frame, 8, FALSE);
  303 
  304         /*
  305          * Figure out frame type.  We look at the address just before
  306          * the saved instruction pointer as the saved EIP is after the
  307          * call function, and if the function being called is marked as
  308          * dead (such as panic() at the end of dblfault_handler()), then
  309          * the instruction at the saved EIP will be part of a different
  310          * function (syscall() in this example) rather than the one that
  311          * actually made the call.
  312          */
  313         frame_type = NORMAL;
  314         sym = db_search_symbol(rip - 1, DB_STGY_ANY, &offset);
  315         db_symbol_values(sym, &name, NULL);
  316         if (name != NULL) {
  317                 if (strcmp(name, "calltrap") == 0 ||
  318                     strcmp(name, "fork_trampoline") == 0)
  319                         frame_type = TRAP;
  320                 else if (strncmp(name, "Xatpic_intr", 11) == 0 ||
  321                     strncmp(name, "Xatpic_fastintr", 15) == 0 ||
  322                     strncmp(name, "Xapic_isr", 9) == 0)
  323                         frame_type = INTERRUPT;
  324                 else if (strcmp(name, "Xfast_syscall") == 0)
  325                         frame_type = SYSCALL;
  326         }
  327 
  328         /*
  329          * Normal frames need no special processing.
  330          */
  331         if (frame_type == NORMAL) {
  332                 *ip = (db_addr_t) rip;
  333                 *fp = (struct amd64_frame *) rbp;
  334                 return;
  335         }
  336 
  337         db_print_stack_entry(name, 0, 0, 0, rip);
  338 
  339         /*
  340          * Point to base of trapframe which is just above the
  341          * current frame.
  342          */
  343         tf = (struct trapframe *)((long)*fp + 16);
  344 
  345         if (INKERNEL((long) tf)) {
  346                 rsp = get_rsp(tf);
  347                 rip = tf->tf_rip;
  348                 rbp = tf->tf_rbp;
  349                 switch (frame_type) {
  350                 case TRAP:
  351                         db_printf("--- trap %#lr", tf->tf_trapno);
  352                         break;
  353                 case SYSCALL:
  354                         db_printf("--- syscall");
  355                         decode_syscall(tf->tf_rax, td);
  356                         break;
  357                 case INTERRUPT:
  358                         db_printf("--- interrupt");
  359                         break;
  360                 default:
  361                         panic("The moon has moved again.");
  362                 }
  363                 db_printf(", rip = %#lr, rsp = %#lr, rbp = %#lr ---\n", rip,
  364                     rsp, rbp);
  365         }
  366 
  367         *ip = (db_addr_t) rip;
  368         *fp = (struct amd64_frame *) rbp;
  369 }
  370 
  371 static int
  372 db_backtrace(struct thread *td, struct trapframe *tf,
  373     struct amd64_frame *frame, db_addr_t pc, int count)
  374 {
  375         struct amd64_frame *actframe;
  376 #define MAXNARG 16
  377         char *argnames[MAXNARG], **argnp = NULL;
  378         const char *name;
  379         long *argp;
  380         db_expr_t offset;
  381         c_db_sym_t sym;
  382         int narg, quit;
  383         boolean_t first;
  384 
  385         if (count == -1)
  386                 count = 1024;
  387 
  388         first = TRUE;
  389         quit = 0;
  390         db_setup_paging(db_simple_pager, &quit, db_lines_per_page);
  391         while (count-- && !quit) {
  392                 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
  393                 db_symbol_values(sym, &name, NULL);
  394 
  395                 /*
  396                  * Attempt to determine a (possibly fake) frame that gives
  397                  * the caller's pc.  It may differ from `frame' if the
  398                  * current function never sets up a standard frame or hasn't
  399                  * set one up yet or has just discarded one.  The last two
  400                  * cases can be guessed fairly reliably for code generated
  401                  * by gcc.  The first case is too much trouble to handle in
  402                  * general because the amount of junk on the stack depends
  403                  * on the pc (the special handling of "calltrap", etc. in
  404                  * db_nextframe() works because the `next' pc is special).
  405                  */
  406                 actframe = frame;
  407                 if (first) {
  408                         if (tf != NULL) {
  409                                 int instr;
  410 
  411                                 instr = db_get_value(pc, 4, FALSE);
  412                                 if ((instr & 0xffffffff) == 0xe5894855) {
  413                                         /* pushq %rbp; movq %rsp, %rbp */
  414                                         actframe = (void *)(get_rsp(tf) - 8);
  415                                 } else if ((instr & 0xffffff) == 0xe58948) {
  416                                         /* movq %rsp, %rbp */
  417                                         actframe = (void *)get_rsp(tf);
  418                                         if (tf->tf_rbp == 0) {
  419                                                 /* Fake frame better. */
  420                                                 frame = actframe;
  421                                         }
  422                                 } else if ((instr & 0xff) == 0xc3) {
  423                                         /* ret */
  424                                         actframe = (void *)(get_rsp(tf) - 8);
  425                                 } else if (offset == 0) {
  426                                         /* Probably an assembler symbol. */
  427                                         actframe = (void *)(get_rsp(tf) - 8);
  428                                 }
  429                         } else if (strcmp(name, "fork_trampoline") == 0) {
  430                                 /*
  431                                  * Don't try to walk back on a stack for a
  432                                  * process that hasn't actually been run yet.
  433                                  */
  434                                 db_print_stack_entry(name, 0, 0, 0, pc);
  435                                 break;
  436                         }
  437                         first = FALSE;
  438                 }
  439 
  440                 argp = &actframe->f_arg0;
  441                 narg = MAXNARG;
  442                 if (sym != NULL && db_sym_numargs(sym, &narg, argnames)) {
  443                         argnp = argnames;
  444                 } else {
  445                         narg = db_numargs(frame);
  446                 }
  447 
  448                 db_print_stack_entry(name, narg, argnp, argp, pc);
  449 
  450                 if (actframe != frame) {
  451                         /* `frame' belongs to caller. */
  452                         pc = (db_addr_t)
  453                             db_get_value((long)&actframe->f_retaddr, 8, FALSE);
  454                         continue;
  455                 }
  456 
  457                 db_nextframe(&frame, &pc, td);
  458 
  459                 if (INKERNEL((long)pc) && !INKERNEL((long)frame)) {
  460                         sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
  461                         db_symbol_values(sym, &name, NULL);
  462                         db_print_stack_entry(name, 0, 0, 0, pc);
  463                         break;
  464                 }
  465                 if (!INKERNEL((long) frame)) {
  466                         break;
  467                 }
  468         }
  469 
  470         return (0);
  471 }
  472 
  473 void
  474 db_trace_self(void)
  475 {
  476         struct amd64_frame *frame;
  477         db_addr_t callpc;
  478         register_t rbp;
  479 
  480         __asm __volatile("movq %%rbp,%0" : "=r" (rbp));
  481         frame = (struct amd64_frame *)rbp;
  482         callpc = (db_addr_t)db_get_value((long)&frame->f_retaddr, 8, FALSE);
  483         frame = frame->f_frame;
  484         db_backtrace(curthread, NULL, frame, callpc, -1);
  485 }
  486 
  487 int
  488 db_trace_thread(struct thread *thr, int count)
  489 {
  490         struct pcb *ctx;
  491 
  492         ctx = kdb_thr_ctx(thr);
  493         return (db_backtrace(thr, NULL, (struct amd64_frame *)ctx->pcb_rbp,
  494                     ctx->pcb_rip, count));
  495 }
  496 
  497 int
  498 amd64_set_watch(watchnum, watchaddr, size, access, d)
  499         int watchnum;
  500         unsigned int watchaddr;
  501         int size;
  502         int access;
  503         struct dbreg * d;
  504 {
  505         int i;
  506         unsigned int mask;
  507         
  508         if (watchnum == -1) {
  509                 for (i = 0, mask = 0x3; i < 4; i++, mask <<= 2)
  510                         if ((d->dr[7] & mask) == 0)
  511                                 break;
  512                 if (i < 4)
  513                         watchnum = i;
  514                 else
  515                         return (-1);
  516         }
  517         
  518         switch (access) {
  519         case DBREG_DR7_EXEC:
  520                 size = 1; /* size must be 1 for an execution breakpoint */
  521                 /* fall through */
  522         case DBREG_DR7_WRONLY:
  523         case DBREG_DR7_RDWR:
  524                 break;
  525         default : return (-1);
  526         }
  527         
  528         /*
  529          * we can watch a 1, 2, or 4 byte sized location
  530          */
  531         switch (size) {
  532         case 1  : mask = 0x00; break;
  533         case 2  : mask = 0x01 << 2; break;
  534         case 4  : mask = 0x03 << 2; break;
  535         default : return (-1);
  536         }
  537 
  538         mask |= access;
  539 
  540         /* clear the bits we are about to affect */
  541         d->dr[7] &= ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16)));
  542 
  543         /* set drN register to the address, N=watchnum */
  544         DBREG_DRX(d,watchnum) = watchaddr;
  545 
  546         /* enable the watchpoint */
  547         d->dr[7] |= (0x2 << (watchnum*2)) | (mask << (watchnum*4+16));
  548 
  549         return (watchnum);
  550 }
  551 
  552 
  553 int
  554 amd64_clr_watch(watchnum, d)
  555         int watchnum;
  556         struct dbreg * d;
  557 {
  558 
  559         if (watchnum < 0 || watchnum >= 4)
  560                 return (-1);
  561         
  562         d->dr[7] = d->dr[7] & ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16)));
  563         DBREG_DRX(d,watchnum) = 0;
  564         
  565         return (0);
  566 }
  567 
  568 
  569 int
  570 db_md_set_watchpoint(addr, size)
  571         db_expr_t addr;
  572         db_expr_t size;
  573 {
  574         int avail, wsize;
  575         int i;
  576         struct dbreg d;
  577         
  578         fill_dbregs(NULL, &d);
  579         
  580         avail = 0;
  581         for(i=0; i<4; i++) {
  582                 if ((d.dr[7] & (3 << (i*2))) == 0)
  583                         avail++;
  584         }
  585         
  586         if (avail*4 < size)
  587                 return (-1);
  588         
  589         for (i=0; i<4 && (size != 0); i++) {
  590                 if ((d.dr[7] & (3<<(i*2))) == 0) {
  591                         if (size > 4)
  592                                 wsize = 4;
  593                         else
  594                                 wsize = size;
  595                         if (wsize == 3)
  596                                 wsize++;
  597                         amd64_set_watch(i, addr, wsize, 
  598                                        DBREG_DR7_WRONLY, &d);
  599                         addr += wsize;
  600                         size -= wsize;
  601                 }
  602         }
  603         
  604         set_dbregs(NULL, &d);
  605         
  606         return(0);
  607 }
  608 
  609 
  610 int
  611 db_md_clr_watchpoint(addr, size)
  612         db_expr_t addr;
  613         db_expr_t size;
  614 {
  615         int i;
  616         struct dbreg d;
  617 
  618         fill_dbregs(NULL, &d);
  619 
  620         for(i=0; i<4; i++) {
  621                 if (d.dr[7] & (3 << (i*2))) {
  622                         if ((DBREG_DRX((&d), i) >= addr) && 
  623                             (DBREG_DRX((&d), i) < addr+size))
  624                                 amd64_clr_watch(i, &d);
  625                         
  626                 }
  627         }
  628         
  629         set_dbregs(NULL, &d);
  630         
  631         return(0);
  632 }
  633 
  634 
  635 static 
  636 char *
  637 watchtype_str(type)
  638         int type;
  639 {
  640         switch (type) {
  641                 case DBREG_DR7_EXEC   : return "execute";    break;
  642                 case DBREG_DR7_RDWR   : return "read/write"; break;
  643                 case DBREG_DR7_WRONLY : return "write";      break;
  644                 default               : return "invalid";    break;
  645         }
  646 }
  647 
  648 
  649 void
  650 db_md_list_watchpoints()
  651 {
  652         int i;
  653         struct dbreg d;
  654 
  655         fill_dbregs(NULL, &d);
  656 
  657         db_printf("\nhardware watchpoints:\n");
  658         db_printf("  watch    status        type  len     address\n");
  659         db_printf("  -----  --------  ----------  ---  ----------\n");
  660         for (i=0; i<4; i++) {
  661                 if (d.dr[7] & (0x03 << (i*2))) {
  662                         unsigned type, len;
  663                         type = (d.dr[7] >> (16+(i*4))) & 3;
  664                         len =  (d.dr[7] >> (16+(i*4)+2)) & 3;
  665                         db_printf("  %-5d  %-8s  %10s  %3d  0x%016lx\n",
  666                                   i, "enabled", watchtype_str(type), 
  667                                   len + 1, DBREG_DRX((&d), i));
  668                 }
  669                 else {
  670                         db_printf("  %-5d  disabled\n", i);
  671                 }
  672         }
  673         
  674         db_printf("\ndebug register values:\n");
  675         for (i=0; i<8; i++) {
  676                 db_printf("  dr%d 0x%016lx\n", i, DBREG_DRX((&d), i));
  677         }
  678         db_printf("\n");
  679 }

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