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/8.2/sys/amd64/amd64/db_trace.c 206336 2010-04-07 02:24:41Z nwhitehorn $");
   29 
   30 #include "opt_compat.h"
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/kdb.h>
   35 #include <sys/proc.h>
   36 #include <sys/stack.h>
   37 #include <sys/sysent.h>
   38 
   39 #include <machine/cpu.h>
   40 #include <machine/md_var.h>
   41 #include <machine/pcb.h>
   42 #include <machine/reg.h>
   43 #include <machine/stack.h>
   44 
   45 #include <vm/vm.h>
   46 #include <vm/vm_param.h>
   47 #include <vm/pmap.h>
   48 
   49 #include <ddb/ddb.h>
   50 #include <ddb/db_access.h>
   51 #include <ddb/db_sym.h>
   52 #include <ddb/db_variables.h>
   53 
   54 static db_varfcn_t db_dr0;
   55 static db_varfcn_t db_dr1;
   56 static db_varfcn_t db_dr2;
   57 static db_varfcn_t db_dr3;
   58 static db_varfcn_t db_dr4;
   59 static db_varfcn_t db_dr5;
   60 static db_varfcn_t db_dr6;
   61 static db_varfcn_t db_dr7;
   62 static db_varfcn_t db_frame;
   63 static db_varfcn_t db_rsp;
   64 static db_varfcn_t db_ss;
   65 
   66 /*
   67  * Machine register set.
   68  */
   69 #define DB_OFFSET(x)    (db_expr_t *)offsetof(struct trapframe, x)
   70 struct db_variable db_regs[] = {
   71         { "cs",         DB_OFFSET(tf_cs),       db_frame },
   72         { "ds",         DB_OFFSET(tf_ds),       db_frame },
   73         { "es",         DB_OFFSET(tf_es),       db_frame },
   74         { "fs",         DB_OFFSET(tf_fs),       db_frame },
   75         { "gs",         DB_OFFSET(tf_gs),       db_frame },
   76         { "ss",         NULL,                   db_ss },
   77         { "rax",        DB_OFFSET(tf_rax),      db_frame },
   78         { "rcx",        DB_OFFSET(tf_rcx),      db_frame },
   79         { "rdx",        DB_OFFSET(tf_rdx),      db_frame },
   80         { "rbx",        DB_OFFSET(tf_rbx),      db_frame },
   81         { "rsp",        NULL,                   db_rsp },
   82         { "rbp",        DB_OFFSET(tf_rbp),      db_frame },
   83         { "rsi",        DB_OFFSET(tf_rsi),      db_frame },
   84         { "rdi",        DB_OFFSET(tf_rdi),      db_frame },
   85         { "r8",         DB_OFFSET(tf_r8),       db_frame },
   86         { "r9",         DB_OFFSET(tf_r9),       db_frame },
   87         { "r10",        DB_OFFSET(tf_r10),      db_frame },
   88         { "r11",        DB_OFFSET(tf_r11),      db_frame },
   89         { "r12",        DB_OFFSET(tf_r12),      db_frame },
   90         { "r13",        DB_OFFSET(tf_r13),      db_frame },
   91         { "r14",        DB_OFFSET(tf_r14),      db_frame },
   92         { "r15",        DB_OFFSET(tf_r15),      db_frame },
   93         { "rip",        DB_OFFSET(tf_rip),      db_frame },
   94         { "rflags",     DB_OFFSET(tf_rflags),   db_frame },
   95 #define DB_N_SHOW_REGS  24      /* Don't show registers after here. */
   96         { "dr0",        NULL,                   db_dr0 },
   97         { "dr1",        NULL,                   db_dr1 },
   98         { "dr2",        NULL,                   db_dr2 },
   99         { "dr3",        NULL,                   db_dr3 },
  100         { "dr4",        NULL,                   db_dr4 },
  101         { "dr5",        NULL,                   db_dr5 },
  102         { "dr6",        NULL,                   db_dr6 },
  103         { "dr7",        NULL,                   db_dr7 },
  104 };
  105 struct db_variable *db_eregs = db_regs + DB_N_SHOW_REGS;
  106 
  107 #define DB_DRX_FUNC(reg)                \
  108 static int                              \
  109 db_ ## reg (vp, valuep, op)             \
  110         struct db_variable *vp;         \
  111         db_expr_t * valuep;             \
  112         int op;                         \
  113 {                                       \
  114         if (op == DB_VAR_GET)           \
  115                 *valuep = r ## reg ();  \
  116         else                            \
  117                 load_ ## reg (*valuep); \
  118         return (1);                     \
  119 }
  120 
  121 DB_DRX_FUNC(dr0)
  122 DB_DRX_FUNC(dr1)
  123 DB_DRX_FUNC(dr2)
  124 DB_DRX_FUNC(dr3)
  125 DB_DRX_FUNC(dr4)
  126 DB_DRX_FUNC(dr5)
  127 DB_DRX_FUNC(dr6)
  128 DB_DRX_FUNC(dr7)
  129 
  130 static __inline long
  131 get_rsp(struct trapframe *tf)
  132 {
  133         return ((ISPL(tf->tf_cs)) ? tf->tf_rsp :
  134             (db_expr_t)tf + offsetof(struct trapframe, tf_rsp));
  135 }
  136 
  137 static int
  138 db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
  139 {
  140         long *reg;
  141 
  142         if (kdb_frame == NULL)
  143                 return (0);
  144 
  145         reg = (long *)((uintptr_t)kdb_frame + (db_expr_t)vp->valuep);
  146         if (op == DB_VAR_GET)
  147                 *valuep = *reg;
  148         else
  149                 *reg = *valuep;
  150         return (1);
  151 }
  152 
  153 static int
  154 db_rsp(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 = get_rsp(kdb_frame);
  162         else if (ISPL(kdb_frame->tf_cs))
  163                 kdb_frame->tf_rsp = *valuep;
  164         return (1);
  165 }
  166 
  167 static int
  168 db_ss(struct db_variable *vp, db_expr_t *valuep, int op)
  169 {
  170 
  171         if (kdb_frame == NULL)
  172                 return (0);
  173 
  174         if (op == DB_VAR_GET)
  175                 *valuep = (ISPL(kdb_frame->tf_cs)) ? kdb_frame->tf_ss : rss();
  176         else if (ISPL(kdb_frame->tf_cs))
  177                 kdb_frame->tf_ss = *valuep;
  178         return (1);
  179 }
  180 
  181 #define NORMAL          0
  182 #define TRAP            1
  183 #define INTERRUPT       2
  184 #define SYSCALL         3
  185 #define TRAP_INTERRUPT  5
  186 
  187 static void db_nextframe(struct amd64_frame **, db_addr_t *, struct thread *);
  188 static int db_numargs(struct amd64_frame *);
  189 static void db_print_stack_entry(const char *, int, char **, long *, db_addr_t);
  190 static void decode_syscall(int, struct thread *);
  191 
  192 static const char * watchtype_str(int type);
  193 int  amd64_set_watch(int watchnum, unsigned long watchaddr, int size,
  194                     int access, struct dbreg *d);
  195 int  amd64_clr_watch(int watchnum, struct dbreg *d);
  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 amd64_frame *fp;
  203 {
  204 #if 1
  205         return (0);     /* regparm, needs dwarf2 info */
  206 #else
  207         long    *argp;
  208         int     inst;
  209         int     args;
  210 
  211         argp = (long *)db_get_value((long)&fp->f_retaddr, 8, FALSE);
  212         /*
  213          * XXX etext is wrong for LKMs.  We should attempt to interpret
  214          * the instruction at the return address in all cases.  This
  215          * may require better fault handling.
  216          */
  217         if (argp < (long *)btext || argp >= (long *)etext) {
  218                 args = 5;
  219         } else {
  220                 inst = db_get_value((long)argp, 4, FALSE);
  221                 if ((inst & 0xff) == 0x59)      /* popl %ecx */
  222                         args = 1;
  223                 else if ((inst & 0xffff) == 0xc483)     /* addl $Ibs, %esp */
  224                         args = ((inst >> 16) & 0xff) / 4;
  225                 else
  226                         args = 5;
  227         }
  228         return (args);
  229 #endif
  230 }
  231 
  232 static void
  233 db_print_stack_entry(name, narg, argnp, argp, callpc)
  234         const char *name;
  235         int narg;
  236         char **argnp;
  237         long *argp;
  238         db_addr_t callpc;
  239 {
  240         db_printf("%s(", name);
  241 #if 0
  242         while (narg) {
  243                 if (argnp)
  244                         db_printf("%s=", *argnp++);
  245                 db_printf("%lr", (long)db_get_value((long)argp, 8, FALSE));
  246                 argp++;
  247                 if (--narg != 0)
  248                         db_printf(",");
  249         }
  250 #endif
  251         db_printf(") at ");
  252         db_printsym(callpc, DB_STGY_PROC);
  253         db_printf("\n");
  254 }
  255 
  256 static void
  257 decode_syscall(int number, struct thread *td)
  258 {
  259         struct proc *p;
  260         c_db_sym_t sym;
  261         db_expr_t diff;
  262         sy_call_t *f;
  263         const char *symname;
  264 
  265         db_printf(" (%d", number);
  266         p = (td != NULL) ? td->td_proc : NULL;
  267         if (p != NULL && 0 <= number && number < p->p_sysent->sv_size) {
  268                 f = p->p_sysent->sv_table[number].sy_call;
  269                 sym = db_search_symbol((db_addr_t)f, DB_STGY_ANY, &diff);
  270                 if (sym != DB_SYM_NULL && diff == 0) {
  271                         db_symbol_values(sym, &symname, NULL);
  272                         db_printf(", %s, %s", p->p_sysent->sv_name, symname);
  273                 }
  274         }
  275         db_printf(")");
  276 }
  277 
  278 /*
  279  * Figure out the next frame up in the call stack.
  280  */
  281 static void
  282 db_nextframe(struct amd64_frame **fp, db_addr_t *ip, struct thread *td)
  283 {
  284         struct trapframe *tf;
  285         int frame_type;
  286         long rip, rsp, rbp;
  287         db_expr_t offset;
  288         c_db_sym_t sym;
  289         const char *name;
  290 
  291         rip = db_get_value((long) &(*fp)->f_retaddr, 8, FALSE);
  292         rbp = db_get_value((long) &(*fp)->f_frame, 8, FALSE);
  293 
  294         /*
  295          * Figure out frame type.  We look at the address just before
  296          * the saved instruction pointer as the saved EIP is after the
  297          * call function, and if the function being called is marked as
  298          * dead (such as panic() at the end of dblfault_handler()), then
  299          * the instruction at the saved EIP will be part of a different
  300          * function (syscall() in this example) rather than the one that
  301          * actually made the call.
  302          */
  303         frame_type = NORMAL;
  304         sym = db_search_symbol(rip - 1, DB_STGY_ANY, &offset);
  305         db_symbol_values(sym, &name, NULL);
  306         if (name != NULL) {
  307                 if (strcmp(name, "calltrap") == 0 ||
  308                     strcmp(name, "fork_trampoline") == 0 ||
  309                     strcmp(name, "nmi_calltrap") == 0 ||
  310                     strcmp(name, "Xdblfault") == 0)
  311                         frame_type = TRAP;
  312                 else if (strncmp(name, "Xatpic_intr", 11) == 0 ||
  313                     strncmp(name, "Xapic_isr", 9) == 0 ||
  314                     strcmp(name, "Xtimerint") == 0 ||
  315                     strcmp(name, "Xipi_intr_bitmap_handler") == 0 ||
  316                     strcmp(name, "Xcpustop") == 0 ||
  317                     strcmp(name, "Xcpususpend") == 0 ||
  318                     strcmp(name, "Xrendezvous") == 0)
  319                         frame_type = INTERRUPT;
  320                 else if (strcmp(name, "Xfast_syscall") == 0)
  321                         frame_type = SYSCALL;
  322 #ifdef COMPAT_FREEBSD32
  323                 else if (strcmp(name, "Xint0x80_syscall") == 0)
  324                         frame_type = SYSCALL;
  325 #endif
  326                 /* XXX: These are interrupts with trap frames. */
  327                 else if (strcmp(name, "Xtimerint") == 0 ||
  328                     strcmp(name, "Xcpustop") == 0 ||
  329                     strcmp(name, "Xcpususpend") == 0 ||
  330                     strcmp(name, "Xrendezvous") == 0 ||
  331                     strcmp(name, "Xipi_intr_bitmap_handler") == 0)
  332                         frame_type = TRAP_INTERRUPT;
  333         }
  334 
  335         /*
  336          * Normal frames need no special processing.
  337          */
  338         if (frame_type == NORMAL) {
  339                 *ip = (db_addr_t) rip;
  340                 *fp = (struct amd64_frame *) rbp;
  341                 return;
  342         }
  343 
  344         db_print_stack_entry(name, 0, 0, 0, rip);
  345 
  346         /*
  347          * Point to base of trapframe which is just above the
  348          * current frame.
  349          */
  350         tf = (struct trapframe *)((long)*fp + 16);
  351 
  352         if (INKERNEL((long) tf)) {
  353                 rsp = get_rsp(tf);
  354                 rip = tf->tf_rip;
  355                 rbp = tf->tf_rbp;
  356                 switch (frame_type) {
  357                 case TRAP:
  358                         db_printf("--- trap %#r", tf->tf_trapno);
  359                         break;
  360                 case SYSCALL:
  361                         db_printf("--- syscall");
  362                         decode_syscall(tf->tf_rax, td);
  363                         break;
  364                 case TRAP_INTERRUPT:
  365                 case INTERRUPT:
  366                         db_printf("--- interrupt");
  367                         break;
  368                 default:
  369                         panic("The moon has moved again.");
  370                 }
  371                 db_printf(", rip = %#lr, rsp = %#lr, rbp = %#lr ---\n", rip,
  372                     rsp, rbp);
  373         }
  374 
  375         *ip = (db_addr_t) rip;
  376         *fp = (struct amd64_frame *) rbp;
  377 }
  378 
  379 static int
  380 db_backtrace(struct thread *td, struct trapframe *tf,
  381     struct amd64_frame *frame, db_addr_t pc, int count)
  382 {
  383         struct amd64_frame *actframe;
  384 #define MAXNARG 16
  385         char *argnames[MAXNARG], **argnp = NULL;
  386         const char *name;
  387         long *argp;
  388         db_expr_t offset;
  389         c_db_sym_t sym;
  390         int narg;
  391         boolean_t first;
  392 
  393         if (count == -1)
  394                 count = 1024;
  395 
  396         first = TRUE;
  397         while (count-- && !db_pager_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 & 0xffffffff) == 0xe5894855) {
  419                                         /* pushq %rbp; movq %rsp, %rbp */
  420                                         actframe = (void *)(get_rsp(tf) - 8);
  421                                 } else if ((instr & 0xffffff) == 0xe58948) {
  422                                         /* movq %rsp, %rbp */
  423                                         actframe = (void *)get_rsp(tf);
  424                                         if (tf->tf_rbp == 0) {
  425                                                 /* Fake frame better. */
  426                                                 frame = actframe;
  427                                         }
  428                                 } else if ((instr & 0xff) == 0xc3) {
  429                                         /* ret */
  430                                         actframe = (void *)(get_rsp(tf) - 8);
  431                                 } else if (offset == 0) {
  432                                         /* Probably an assembler symbol. */
  433                                         actframe = (void *)(get_rsp(tf) - 8);
  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((long)&actframe->f_retaddr, 8, FALSE);
  460                         continue;
  461                 }
  462 
  463                 db_nextframe(&frame, &pc, td);
  464 
  465                 if (INKERNEL((long)pc) && !INKERNEL((long)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((long) frame)) {
  472                         break;
  473                 }
  474         }
  475 
  476         return (0);
  477 }
  478 
  479 void
  480 db_trace_self(void)
  481 {
  482         struct amd64_frame *frame;
  483         db_addr_t callpc;
  484         register_t rbp;
  485 
  486         __asm __volatile("movq %%rbp,%0" : "=r" (rbp));
  487         frame = (struct amd64_frame *)rbp;
  488         callpc = (db_addr_t)db_get_value((long)&frame->f_retaddr, 8, 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 amd64_frame *)ctx->pcb_rbp,
  500                     ctx->pcb_rip, count));
  501 }
  502 
  503 int
  504 amd64_set_watch(watchnum, watchaddr, size, access, d)
  505         int watchnum;
  506         unsigned long watchaddr;
  507         int size;
  508         int access;
  509         struct dbreg *d;
  510 {
  511         int i, len;
  512 
  513         if (watchnum == -1) {
  514                 for (i = 0; i < 4; i++)
  515                         if (!DBREG_DR7_ENABLED(d->dr[7], i))
  516                                 break;
  517                 if (i < 4)
  518                         watchnum = i;
  519                 else
  520                         return (-1);
  521         }
  522 
  523         switch (access) {
  524         case DBREG_DR7_EXEC:
  525                 size = 1; /* size must be 1 for an execution breakpoint */
  526                 /* fall through */
  527         case DBREG_DR7_WRONLY:
  528         case DBREG_DR7_RDWR:
  529                 break;
  530         default:
  531                 return (-1);
  532         }
  533 
  534         /*
  535          * we can watch a 1, 2, 4, or 8 byte sized location
  536          */
  537         switch (size) {
  538         case 1:
  539                 len = DBREG_DR7_LEN_1;
  540                 break;
  541         case 2:
  542                 len = DBREG_DR7_LEN_2;
  543                 break;
  544         case 4:
  545                 len = DBREG_DR7_LEN_4;
  546                 break;
  547         case 8:
  548                 len = DBREG_DR7_LEN_8;
  549                 break;
  550         default:
  551                 return (-1);
  552         }
  553 
  554         /* clear the bits we are about to affect */
  555         d->dr[7] &= ~DBREG_DR7_MASK(watchnum);
  556 
  557         /* set drN register to the address, N=watchnum */
  558         DBREG_DRX(d, watchnum) = watchaddr;
  559 
  560         /* enable the watchpoint */
  561         d->dr[7] |= DBREG_DR7_SET(watchnum, len, access,
  562             DBREG_DR7_GLOBAL_ENABLE);
  563 
  564         return (watchnum);
  565 }
  566 
  567 
  568 int
  569 amd64_clr_watch(watchnum, d)
  570         int watchnum;
  571         struct dbreg *d;
  572 {
  573 
  574         if (watchnum < 0 || watchnum >= 4)
  575                 return (-1);
  576 
  577         d->dr[7] &= ~DBREG_DR7_MASK(watchnum);
  578         DBREG_DRX(d, watchnum) = 0;
  579 
  580         return (0);
  581 }
  582 
  583 
  584 int
  585 db_md_set_watchpoint(addr, size)
  586         db_expr_t addr;
  587         db_expr_t size;
  588 {
  589         struct dbreg d;
  590         int avail, i, wsize;
  591 
  592         fill_dbregs(NULL, &d);
  593 
  594         avail = 0;
  595         for(i = 0; i < 4; i++) {
  596                 if (!DBREG_DR7_ENABLED(d.dr[7], i))
  597                         avail++;
  598         }
  599 
  600         if (avail * 8 < size)
  601                 return (-1);
  602 
  603         for (i = 0; i < 4 && (size > 0); i++) {
  604                 if (!DBREG_DR7_ENABLED(d.dr[7], i)) {
  605                         if (size >= 8 || (avail == 1 && size > 4))
  606                                 wsize = 8;
  607                         else if (size > 2)
  608                                 wsize = 4;
  609                         else
  610                                 wsize = size;
  611                         amd64_set_watch(i, addr, wsize,
  612                                        DBREG_DR7_WRONLY, &d);
  613                         addr += wsize;
  614                         size -= wsize;
  615                         avail--;
  616                 }
  617         }
  618 
  619         set_dbregs(NULL, &d);
  620 
  621         return(0);
  622 }
  623 
  624 
  625 int
  626 db_md_clr_watchpoint(addr, size)
  627         db_expr_t addr;
  628         db_expr_t size;
  629 {
  630         struct dbreg d;
  631         int i;
  632 
  633         fill_dbregs(NULL, &d);
  634 
  635         for(i = 0; i < 4; i++) {
  636                 if (DBREG_DR7_ENABLED(d.dr[7], i)) {
  637                         if ((DBREG_DRX((&d), i) >= addr) &&
  638                             (DBREG_DRX((&d), i) < addr+size))
  639                                 amd64_clr_watch(i, &d);
  640 
  641                 }
  642         }
  643 
  644         set_dbregs(NULL, &d);
  645 
  646         return(0);
  647 }
  648 
  649 
  650 static const char *
  651 watchtype_str(type)
  652         int type;
  653 {
  654         switch (type) {
  655                 case DBREG_DR7_EXEC   : return "execute";    break;
  656                 case DBREG_DR7_RDWR   : return "read/write"; break;
  657                 case DBREG_DR7_WRONLY : return "write";      break;
  658                 default               : return "invalid";    break;
  659         }
  660 }
  661 
  662 
  663 void
  664 db_md_list_watchpoints()
  665 {
  666         struct dbreg d;
  667         int i, len, type;
  668 
  669         fill_dbregs(NULL, &d);
  670 
  671         db_printf("\nhardware watchpoints:\n");
  672         db_printf("  watch    status        type  len             address\n");
  673         db_printf("  -----  --------  ----------  ---  ------------------\n");
  674         for (i = 0; i < 4; i++) {
  675                 if (DBREG_DR7_ENABLED(d.dr[7], i)) {
  676                         type = DBREG_DR7_ACCESS(d.dr[7], i);
  677                         len = DBREG_DR7_LEN(d.dr[7], i);
  678                         if (len == DBREG_DR7_LEN_8)
  679                                 len = 8;
  680                         else
  681                                 len++;
  682                         db_printf("  %-5d  %-8s  %10s  %3d  ",
  683                             i, "enabled", watchtype_str(type), len);
  684                         db_printsym((db_addr_t)DBREG_DRX((&d), i), DB_STGY_ANY);
  685                         db_printf("\n");
  686                 } else {
  687                         db_printf("  %-5d  disabled\n", i);
  688                 }
  689         }
  690 
  691         db_printf("\ndebug register values:\n");
  692         for (i = 0; i < 8; i++) {
  693                 db_printf("  dr%d 0x%016lx\n", i, DBREG_DRX((&d), i));
  694         }
  695         db_printf("\n");
  696 }

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