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/6.2/sys/amd64/amd64/db_trace.c 156616 2006-03-13 03:03:51Z jeff $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kdb.h>
   33 #include <sys/proc.h>
   34 #include <sys/stack.h>
   35 #include <sys/sysent.h>
   36 
   37 #include <machine/cpu.h>
   38 #include <machine/md_var.h>
   39 #include <machine/pcb.h>
   40 #include <machine/reg.h>
   41 
   42 #include <vm/vm.h>
   43 #include <vm/vm_param.h>
   44 #include <vm/pmap.h>
   45 
   46 #include <ddb/ddb.h>
   47 #include <ddb/db_access.h>
   48 #include <ddb/db_sym.h>
   49 #include <ddb/db_variables.h>
   50 
   51 static db_varfcn_t db_dr0;
   52 static db_varfcn_t db_dr1;
   53 static db_varfcn_t db_dr2;
   54 static db_varfcn_t db_dr3;
   55 static db_varfcn_t db_dr4;
   56 static db_varfcn_t db_dr5;
   57 static db_varfcn_t db_dr6;
   58 static db_varfcn_t db_dr7;
   59 static db_varfcn_t db_frame;
   60 static db_varfcn_t db_rsp;
   61 static db_varfcn_t db_ss;
   62 
   63 /*
   64  * Machine register set.
   65  */
   66 #define DB_OFFSET(x)    (db_expr_t *)offsetof(struct trapframe, x)
   67 struct db_variable db_regs[] = {
   68         { "cs",         DB_OFFSET(tf_cs),       db_frame },
   69 #if 0
   70         { "ds",         DB_OFFSET(tf_ds),       db_frame },
   71         { "es",         DB_OFFSET(tf_es),       db_frame },
   72         { "fs",         DB_OFFSET(tf_fs),       db_frame },
   73         { "gs",         DB_OFFSET(tf_gs),       db_frame },
   74 #endif
   75         { "ss",         NULL,                   db_ss },
   76         { "rax",        DB_OFFSET(tf_rax),      db_frame },
   77         { "rcx",        DB_OFFSET(tf_rcx),      db_frame },
   78         { "rdx",        DB_OFFSET(tf_rdx),      db_frame },
   79         { "rbx",        DB_OFFSET(tf_rbx),      db_frame },
   80         { "rsp",        NULL,                   db_rsp },
   81         { "rbp",        DB_OFFSET(tf_rbp),      db_frame },
   82         { "rsi",        DB_OFFSET(tf_rsi),      db_frame },
   83         { "rdi",        DB_OFFSET(tf_rdi),      db_frame },
   84         { "r8",         DB_OFFSET(tf_r8),       db_frame },
   85         { "r9",         DB_OFFSET(tf_r9),       db_frame },
   86         { "r10",        DB_OFFSET(tf_r10),      db_frame },
   87         { "r11",        DB_OFFSET(tf_r11),      db_frame },
   88         { "r12",        DB_OFFSET(tf_r12),      db_frame },
   89         { "r13",        DB_OFFSET(tf_r13),      db_frame },
   90         { "r14",        DB_OFFSET(tf_r14),      db_frame },
   91         { "r15",        DB_OFFSET(tf_r15),      db_frame },
   92         { "rip",        DB_OFFSET(tf_rip),      db_frame },
   93         { "rflags",     DB_OFFSET(tf_rflags),   db_frame },
   94         { "dr0",        NULL,                   db_dr0 },
   95         { "dr1",        NULL,                   db_dr1 },
   96         { "dr2",        NULL,                   db_dr2 },
   97         { "dr3",        NULL,                   db_dr3 },
   98         { "dr4",        NULL,                   db_dr4 },
   99         { "dr5",        NULL,                   db_dr5 },
  100         { "dr6",        NULL,                   db_dr6 },
  101         { "dr7",        NULL,                   db_dr7 },
  102 };
  103 struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]);
  104 
  105 #define DB_DRX_FUNC(reg)                \
  106 static int                              \
  107 db_ ## reg (vp, valuep, op)             \
  108         struct db_variable *vp;         \
  109         db_expr_t * valuep;             \
  110         int op;                         \
  111 {                                       \
  112         if (op == DB_VAR_GET)           \
  113                 *valuep = r ## reg ();  \
  114         else                            \
  115                 load_ ## reg (*valuep); \
  116         return (1);                     \
  117 }
  118 
  119 DB_DRX_FUNC(dr0)
  120 DB_DRX_FUNC(dr1)
  121 DB_DRX_FUNC(dr2)
  122 DB_DRX_FUNC(dr3)
  123 DB_DRX_FUNC(dr4)
  124 DB_DRX_FUNC(dr5)
  125 DB_DRX_FUNC(dr6)
  126 DB_DRX_FUNC(dr7)
  127 
  128 static __inline long
  129 get_rsp(struct trapframe *tf)
  130 {
  131         return ((ISPL(tf->tf_cs)) ? tf->tf_rsp :
  132             (db_expr_t)tf + offsetof(struct trapframe, tf_rsp));
  133 }
  134 
  135 static int
  136 db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
  137 {
  138         long *reg;
  139 
  140         if (kdb_frame == NULL)
  141                 return (0);
  142 
  143         reg = (long *)((uintptr_t)kdb_frame + (db_expr_t)vp->valuep);
  144         if (op == DB_VAR_GET)
  145                 *valuep = *reg;
  146         else
  147                 *reg = *valuep;
  148         return (1);
  149 }
  150 
  151 static int
  152 db_rsp(struct db_variable *vp, db_expr_t *valuep, int op)
  153 {
  154 
  155         if (kdb_frame == NULL)
  156                 return (0);
  157 
  158         if (op == DB_VAR_GET)
  159                 *valuep = get_rsp(kdb_frame);
  160         else if (ISPL(kdb_frame->tf_cs))
  161                 kdb_frame->tf_rsp = *valuep;
  162         return (1);
  163 }
  164 
  165 static int
  166 db_ss(struct db_variable *vp, db_expr_t *valuep, int op)
  167 {
  168 
  169         if (kdb_frame == NULL)
  170                 return (0);
  171 
  172         if (op == DB_VAR_GET)
  173                 *valuep = (ISPL(kdb_frame->tf_cs)) ? kdb_frame->tf_ss : rss();
  174         else if (ISPL(kdb_frame->tf_cs))
  175                 kdb_frame->tf_ss = *valuep;
  176         return (1);
  177 }
  178 
  179 /*
  180  * Stack trace.
  181  */
  182 #define INKERNEL(va) (((va) >= DMAP_MIN_ADDRESS && (va) < DMAP_MAX_ADDRESS) \
  183             || ((va) >= KERNBASE && (va) < VM_MAX_KERNEL_ADDRESS))
  184 
  185 struct amd64_frame {
  186         struct amd64_frame      *f_frame;
  187         long                    f_retaddr;
  188         long                    f_arg0;
  189 };
  190 
  191 #define NORMAL          0
  192 #define TRAP            1
  193 #define INTERRUPT       2
  194 #define SYSCALL         3
  195 
  196 static void db_nextframe(struct amd64_frame **, db_addr_t *, struct thread *);
  197 static int db_numargs(struct amd64_frame *);
  198 static void db_print_stack_entry(const char *, int, char **, long *, db_addr_t);
  199 static void decode_syscall(int, struct thread *);
  200 
  201 static char * watchtype_str(int type);
  202 int  amd64_set_watch(int watchnum, unsigned int watchaddr, int size, int access,
  203                     struct dbreg * d);
  204 int  amd64_clr_watch(int watchnum, struct dbreg * d);
  205 int  db_md_set_watchpoint(db_expr_t addr, db_expr_t size);
  206 int  db_md_clr_watchpoint(db_expr_t addr, db_expr_t size);
  207 void db_md_list_watchpoints(void);
  208 
  209 /*
  210  * Figure out how many arguments were passed into the frame at "fp".
  211  */
  212 static int
  213 db_numargs(fp)
  214         struct amd64_frame *fp;
  215 {
  216 #if 1
  217         return (0);     /* regparm, needs dwarf2 info */
  218 #else
  219         long    *argp;
  220         int     inst;
  221         int     args;
  222 
  223         argp = (long *)db_get_value((long)&fp->f_retaddr, 8, FALSE);
  224         /*
  225          * XXX etext is wrong for LKMs.  We should attempt to interpret
  226          * the instruction at the return address in all cases.  This
  227          * may require better fault handling.
  228          */
  229         if (argp < (long *)btext || argp >= (long *)etext) {
  230                 args = 5;
  231         } else {
  232                 inst = db_get_value((long)argp, 4, FALSE);
  233                 if ((inst & 0xff) == 0x59)      /* popl %ecx */
  234                         args = 1;
  235                 else if ((inst & 0xffff) == 0xc483)     /* addl $Ibs, %esp */
  236                         args = ((inst >> 16) & 0xff) / 4;
  237                 else
  238                         args = 5;
  239         }
  240         return (args);
  241 #endif
  242 }
  243 
  244 static void
  245 db_print_stack_entry(name, narg, argnp, argp, callpc)
  246         const char *name;
  247         int narg;
  248         char **argnp;
  249         long *argp;
  250         db_addr_t callpc;
  251 {
  252         db_printf("%s(", name);
  253 #if 0
  254         while (narg) {
  255                 if (argnp)
  256                         db_printf("%s=", *argnp++);
  257                 db_printf("%lr", (long)db_get_value((long)argp, 8, FALSE));
  258                 argp++;
  259                 if (--narg != 0)
  260                         db_printf(",");
  261         }
  262 #endif
  263         db_printf(") at ");
  264         db_printsym(callpc, DB_STGY_PROC);
  265         db_printf("\n");
  266 }
  267 
  268 static void
  269 decode_syscall(int number, struct thread *td)
  270 {
  271         struct proc *p;
  272         c_db_sym_t sym;
  273         db_expr_t diff;
  274         sy_call_t *f;
  275         const char *symname;
  276 
  277         db_printf(" (%d", number);
  278         p = (td != NULL) ? td->td_proc : NULL;
  279         if (p != NULL && 0 <= number && number < p->p_sysent->sv_size) {
  280                 f = p->p_sysent->sv_table[number].sy_call;
  281                 sym = db_search_symbol((db_addr_t)f, DB_STGY_ANY, &diff);
  282                 if (sym != DB_SYM_NULL && diff == 0) {
  283                         db_symbol_values(sym, &symname, NULL);
  284                         db_printf(", %s, %s", p->p_sysent->sv_name, symname);
  285                 }
  286         }
  287         db_printf(")");
  288 }
  289 
  290 /*
  291  * Figure out the next frame up in the call stack.
  292  */
  293 static void
  294 db_nextframe(struct amd64_frame **fp, db_addr_t *ip, struct thread *td)
  295 {
  296         struct trapframe *tf;
  297         int frame_type;
  298         long rip, rsp, rbp;
  299         db_expr_t offset;
  300         c_db_sym_t sym;
  301         const char *name;
  302 
  303         rip = db_get_value((long) &(*fp)->f_retaddr, 8, FALSE);
  304         rbp = db_get_value((long) &(*fp)->f_frame, 8, FALSE);
  305 
  306         /*
  307          * Figure out frame type.  We look at the address just before
  308          * the saved instruction pointer as the saved EIP is after the
  309          * call function, and if the function being called is marked as
  310          * dead (such as panic() at the end of dblfault_handler()), then
  311          * the instruction at the saved EIP will be part of a different
  312          * function (syscall() in this example) rather than the one that
  313          * actually made the call.
  314          */
  315         frame_type = NORMAL;
  316         sym = db_search_symbol(rip - 1, DB_STGY_ANY, &offset);
  317         db_symbol_values(sym, &name, NULL);
  318         if (name != NULL) {
  319                 if (strcmp(name, "calltrap") == 0 ||
  320                     strcmp(name, "fork_trampoline") == 0 ||
  321                     strcmp(name, "nmi_calltrap") == 0)
  322                         frame_type = TRAP;
  323                 else if (strncmp(name, "Xatpic_intr", 11) == 0 ||
  324                     strncmp(name, "Xatpic_fastintr", 15) == 0 ||
  325                     strncmp(name, "Xapic_isr", 9) == 0)
  326                         frame_type = INTERRUPT;
  327                 else if (strcmp(name, "Xfast_syscall") == 0)
  328                         frame_type = SYSCALL;
  329         }
  330 
  331         /*
  332          * Normal frames need no special processing.
  333          */
  334         if (frame_type == NORMAL) {
  335                 *ip = (db_addr_t) rip;
  336                 *fp = (struct amd64_frame *) rbp;
  337                 return;
  338         }
  339 
  340         db_print_stack_entry(name, 0, 0, 0, rip);
  341 
  342         /*
  343          * Point to base of trapframe which is just above the
  344          * current frame.
  345          */
  346         tf = (struct trapframe *)((long)*fp + 16);
  347 
  348         if (INKERNEL((long) tf)) {
  349                 rsp = get_rsp(tf);
  350                 rip = tf->tf_rip;
  351                 rbp = tf->tf_rbp;
  352                 switch (frame_type) {
  353                 case TRAP:
  354                         db_printf("--- trap %#lr", tf->tf_trapno);
  355                         break;
  356                 case SYSCALL:
  357                         db_printf("--- syscall");
  358                         decode_syscall(tf->tf_rax, td);
  359                         break;
  360                 case INTERRUPT:
  361                         db_printf("--- interrupt");
  362                         break;
  363                 default:
  364                         panic("The moon has moved again.");
  365                 }
  366                 db_printf(", rip = %#lr, rsp = %#lr, rbp = %#lr ---\n", rip,
  367                     rsp, rbp);
  368         }
  369 
  370         *ip = (db_addr_t) rip;
  371         *fp = (struct amd64_frame *) rbp;
  372 }
  373 
  374 static int
  375 db_backtrace(struct thread *td, struct trapframe *tf,
  376     struct amd64_frame *frame, db_addr_t pc, int count)
  377 {
  378         struct amd64_frame *actframe;
  379 #define MAXNARG 16
  380         char *argnames[MAXNARG], **argnp = NULL;
  381         const char *name;
  382         long *argp;
  383         db_expr_t offset;
  384         c_db_sym_t sym;
  385         int narg, quit;
  386         boolean_t first;
  387 
  388         if (count == -1)
  389                 count = 1024;
  390 
  391         first = TRUE;
  392         quit = 0;
  393         db_setup_paging(db_simple_pager, &quit, db_lines_per_page);
  394         while (count-- && !quit) {
  395                 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
  396                 db_symbol_values(sym, &name, NULL);
  397 
  398                 /*
  399                  * Attempt to determine a (possibly fake) frame that gives
  400                  * the caller's pc.  It may differ from `frame' if the
  401                  * current function never sets up a standard frame or hasn't
  402                  * set one up yet or has just discarded one.  The last two
  403                  * cases can be guessed fairly reliably for code generated
  404                  * by gcc.  The first case is too much trouble to handle in
  405                  * general because the amount of junk on the stack depends
  406                  * on the pc (the special handling of "calltrap", etc. in
  407                  * db_nextframe() works because the `next' pc is special).
  408                  */
  409                 actframe = frame;
  410                 if (first) {
  411                         if (tf != NULL) {
  412                                 int instr;
  413 
  414                                 instr = db_get_value(pc, 4, FALSE);
  415                                 if ((instr & 0xffffffff) == 0xe5894855) {
  416                                         /* pushq %rbp; movq %rsp, %rbp */
  417                                         actframe = (void *)(get_rsp(tf) - 8);
  418                                 } else if ((instr & 0xffffff) == 0xe58948) {
  419                                         /* movq %rsp, %rbp */
  420                                         actframe = (void *)get_rsp(tf);
  421                                         if (tf->tf_rbp == 0) {
  422                                                 /* Fake frame better. */
  423                                                 frame = actframe;
  424                                         }
  425                                 } else if ((instr & 0xff) == 0xc3) {
  426                                         /* ret */
  427                                         actframe = (void *)(get_rsp(tf) - 8);
  428                                 } else if (offset == 0) {
  429                                         /* Probably an assembler symbol. */
  430                                         actframe = (void *)(get_rsp(tf) - 8);
  431                                 }
  432                         } else if (strcmp(name, "fork_trampoline") == 0) {
  433                                 /*
  434                                  * Don't try to walk back on a stack for a
  435                                  * process that hasn't actually been run yet.
  436                                  */
  437                                 db_print_stack_entry(name, 0, 0, 0, pc);
  438                                 break;
  439                         }
  440                         first = FALSE;
  441                 }
  442 
  443                 argp = &actframe->f_arg0;
  444                 narg = MAXNARG;
  445                 if (sym != NULL && db_sym_numargs(sym, &narg, argnames)) {
  446                         argnp = argnames;
  447                 } else {
  448                         narg = db_numargs(frame);
  449                 }
  450 
  451                 db_print_stack_entry(name, narg, argnp, argp, pc);
  452 
  453                 if (actframe != frame) {
  454                         /* `frame' belongs to caller. */
  455                         pc = (db_addr_t)
  456                             db_get_value((long)&actframe->f_retaddr, 8, FALSE);
  457                         continue;
  458                 }
  459 
  460                 db_nextframe(&frame, &pc, td);
  461 
  462                 if (INKERNEL((long)pc) && !INKERNEL((long)frame)) {
  463                         sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
  464                         db_symbol_values(sym, &name, NULL);
  465                         db_print_stack_entry(name, 0, 0, 0, pc);
  466                         break;
  467                 }
  468                 if (!INKERNEL((long) frame)) {
  469                         break;
  470                 }
  471         }
  472 
  473         return (0);
  474 }
  475 
  476 void
  477 db_trace_self(void)
  478 {
  479         struct amd64_frame *frame;
  480         db_addr_t callpc;
  481         register_t rbp;
  482 
  483         __asm __volatile("movq %%rbp,%0" : "=r" (rbp));
  484         frame = (struct amd64_frame *)rbp;
  485         callpc = (db_addr_t)db_get_value((long)&frame->f_retaddr, 8, FALSE);
  486         frame = frame->f_frame;
  487         db_backtrace(curthread, NULL, frame, callpc, -1);
  488 }
  489 
  490 int
  491 db_trace_thread(struct thread *thr, int count)
  492 {
  493         struct pcb *ctx;
  494 
  495         ctx = kdb_thr_ctx(thr);
  496         return (db_backtrace(thr, NULL, (struct amd64_frame *)ctx->pcb_rbp,
  497                     ctx->pcb_rip, count));
  498 }
  499 
  500 void
  501 stack_save(struct stack *st)
  502 {
  503         struct amd64_frame *frame;
  504         vm_offset_t callpc;
  505         register_t rbp;
  506 
  507         stack_zero(st);
  508         __asm __volatile("movq %%rbp,%0" : "=r" (rbp));
  509         frame = (struct amd64_frame *)rbp;
  510         while (1) {
  511                 if (!INKERNEL((long)frame))
  512                         break;
  513                 callpc = frame->f_retaddr;
  514                 if (!INKERNEL(callpc))
  515                         break;
  516                 if (stack_put(st, callpc) == -1)
  517                         break;
  518                 if (frame->f_frame <= frame ||
  519                     (vm_offset_t)frame->f_frame >=
  520                     (vm_offset_t)rbp + KSTACK_PAGES * PAGE_SIZE)
  521                         break;
  522                 frame = frame->f_frame;
  523         }
  524 }
  525 
  526 int
  527 amd64_set_watch(watchnum, watchaddr, size, access, d)
  528         int watchnum;
  529         unsigned int watchaddr;
  530         int size;
  531         int access;
  532         struct dbreg * d;
  533 {
  534         int i;
  535         unsigned int mask;
  536         
  537         if (watchnum == -1) {
  538                 for (i = 0, mask = 0x3; i < 4; i++, mask <<= 2)
  539                         if ((d->dr[7] & mask) == 0)
  540                                 break;
  541                 if (i < 4)
  542                         watchnum = i;
  543                 else
  544                         return (-1);
  545         }
  546         
  547         switch (access) {
  548         case DBREG_DR7_EXEC:
  549                 size = 1; /* size must be 1 for an execution breakpoint */
  550                 /* fall through */
  551         case DBREG_DR7_WRONLY:
  552         case DBREG_DR7_RDWR:
  553                 break;
  554         default : return (-1);
  555         }
  556         
  557         /*
  558          * we can watch a 1, 2, or 4 byte sized location
  559          */
  560         switch (size) {
  561         case 1  : mask = 0x00; break;
  562         case 2  : mask = 0x01 << 2; break;
  563         case 4  : mask = 0x03 << 2; break;
  564         default : return (-1);
  565         }
  566 
  567         mask |= access;
  568 
  569         /* clear the bits we are about to affect */
  570         d->dr[7] &= ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16)));
  571 
  572         /* set drN register to the address, N=watchnum */
  573         DBREG_DRX(d,watchnum) = watchaddr;
  574 
  575         /* enable the watchpoint */
  576         d->dr[7] |= (0x2 << (watchnum*2)) | (mask << (watchnum*4+16));
  577 
  578         return (watchnum);
  579 }
  580 
  581 
  582 int
  583 amd64_clr_watch(watchnum, d)
  584         int watchnum;
  585         struct dbreg * d;
  586 {
  587 
  588         if (watchnum < 0 || watchnum >= 4)
  589                 return (-1);
  590         
  591         d->dr[7] = d->dr[7] & ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16)));
  592         DBREG_DRX(d,watchnum) = 0;
  593         
  594         return (0);
  595 }
  596 
  597 
  598 int
  599 db_md_set_watchpoint(addr, size)
  600         db_expr_t addr;
  601         db_expr_t size;
  602 {
  603         int avail, wsize;
  604         int i;
  605         struct dbreg d;
  606         
  607         fill_dbregs(NULL, &d);
  608         
  609         avail = 0;
  610         for(i=0; i<4; i++) {
  611                 if ((d.dr[7] & (3 << (i*2))) == 0)
  612                         avail++;
  613         }
  614         
  615         if (avail*4 < size)
  616                 return (-1);
  617         
  618         for (i=0; i<4 && (size != 0); i++) {
  619                 if ((d.dr[7] & (3<<(i*2))) == 0) {
  620                         if (size > 4)
  621                                 wsize = 4;
  622                         else
  623                                 wsize = size;
  624                         if (wsize == 3)
  625                                 wsize++;
  626                         amd64_set_watch(i, addr, wsize, 
  627                                        DBREG_DR7_WRONLY, &d);
  628                         addr += wsize;
  629                         size -= wsize;
  630                 }
  631         }
  632         
  633         set_dbregs(NULL, &d);
  634         
  635         return(0);
  636 }
  637 
  638 
  639 int
  640 db_md_clr_watchpoint(addr, size)
  641         db_expr_t addr;
  642         db_expr_t size;
  643 {
  644         int i;
  645         struct dbreg d;
  646 
  647         fill_dbregs(NULL, &d);
  648 
  649         for(i=0; i<4; i++) {
  650                 if (d.dr[7] & (3 << (i*2))) {
  651                         if ((DBREG_DRX((&d), i) >= addr) && 
  652                             (DBREG_DRX((&d), i) < addr+size))
  653                                 amd64_clr_watch(i, &d);
  654                         
  655                 }
  656         }
  657         
  658         set_dbregs(NULL, &d);
  659         
  660         return(0);
  661 }
  662 
  663 
  664 static 
  665 char *
  666 watchtype_str(type)
  667         int type;
  668 {
  669         switch (type) {
  670                 case DBREG_DR7_EXEC   : return "execute";    break;
  671                 case DBREG_DR7_RDWR   : return "read/write"; break;
  672                 case DBREG_DR7_WRONLY : return "write";      break;
  673                 default               : return "invalid";    break;
  674         }
  675 }
  676 
  677 
  678 void
  679 db_md_list_watchpoints()
  680 {
  681         int i;
  682         struct dbreg d;
  683 
  684         fill_dbregs(NULL, &d);
  685 
  686         db_printf("\nhardware watchpoints:\n");
  687         db_printf("  watch    status        type  len     address\n");
  688         db_printf("  -----  --------  ----------  ---  ----------\n");
  689         for (i=0; i<4; i++) {
  690                 if (d.dr[7] & (0x03 << (i*2))) {
  691                         unsigned type, len;
  692                         type = (d.dr[7] >> (16+(i*4))) & 3;
  693                         len =  (d.dr[7] >> (16+(i*4)+2)) & 3;
  694                         db_printf("  %-5d  %-8s  %10s  %3d  0x%016lx\n",
  695                                   i, "enabled", watchtype_str(type), 
  696                                   len + 1, DBREG_DRX((&d), i));
  697                 }
  698                 else {
  699                         db_printf("  %-5d  disabled\n", i);
  700                 }
  701         }
  702         
  703         db_printf("\ndebug register values:\n");
  704         for (i=0; i<8; i++) {
  705                 db_printf("  dr%d 0x%016lx\n", i, DBREG_DRX((&d), i));
  706         }
  707         db_printf("\n");
  708 }

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