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/12.0/sys/amd64/amd64/db_trace.c 332122 2018-04-06 17:35:35Z brooks $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kdb.h>
   33 #include <sys/proc.h>
   34 #include <sys/smp.h>
   35 #include <sys/stack.h>
   36 #include <sys/sysent.h>
   37 
   38 #include <machine/cpu.h>
   39 #include <machine/md_var.h>
   40 #include <machine/pcb.h>
   41 #include <machine/reg.h>
   42 #include <machine/stack.h>
   43 
   44 #include <vm/vm.h>
   45 #include <vm/vm_param.h>
   46 #include <vm/pmap.h>
   47 
   48 #include <ddb/ddb.h>
   49 #include <ddb/db_access.h>
   50 #include <ddb/db_sym.h>
   51 #include <ddb/db_variables.h>
   52 
   53 static db_varfcn_t db_frame;
   54 static db_varfcn_t db_frame_seg;
   55 
   56 CTASSERT(sizeof(struct dbreg) == sizeof(((struct pcpu *)NULL)->pc_dbreg));
   57 
   58 /*
   59  * Machine register set.
   60  */
   61 #define DB_OFFSET(x)    (db_expr_t *)offsetof(struct trapframe, x)
   62 struct db_variable db_regs[] = {
   63         { "cs",         DB_OFFSET(tf_cs),       db_frame_seg },
   64         { "ds",         DB_OFFSET(tf_ds),       db_frame_seg },
   65         { "es",         DB_OFFSET(tf_es),       db_frame_seg },
   66         { "fs",         DB_OFFSET(tf_fs),       db_frame_seg },
   67         { "gs",         DB_OFFSET(tf_gs),       db_frame_seg },
   68         { "ss",         DB_OFFSET(tf_ss),       db_frame_seg },
   69         { "rax",        DB_OFFSET(tf_rax),      db_frame },
   70         { "rcx",        DB_OFFSET(tf_rcx),      db_frame },
   71         { "rdx",        DB_OFFSET(tf_rdx),      db_frame },
   72         { "rbx",        DB_OFFSET(tf_rbx),      db_frame },
   73         { "rsp",        DB_OFFSET(tf_rsp),      db_frame },
   74         { "rbp",        DB_OFFSET(tf_rbp),      db_frame },
   75         { "rsi",        DB_OFFSET(tf_rsi),      db_frame },
   76         { "rdi",        DB_OFFSET(tf_rdi),      db_frame },
   77         { "r8",         DB_OFFSET(tf_r8),       db_frame },
   78         { "r9",         DB_OFFSET(tf_r9),       db_frame },
   79         { "r10",        DB_OFFSET(tf_r10),      db_frame },
   80         { "r11",        DB_OFFSET(tf_r11),      db_frame },
   81         { "r12",        DB_OFFSET(tf_r12),      db_frame },
   82         { "r13",        DB_OFFSET(tf_r13),      db_frame },
   83         { "r14",        DB_OFFSET(tf_r14),      db_frame },
   84         { "r15",        DB_OFFSET(tf_r15),      db_frame },
   85         { "rip",        DB_OFFSET(tf_rip),      db_frame },
   86         { "rflags",     DB_OFFSET(tf_rflags),   db_frame },
   87 };
   88 struct db_variable *db_eregs = db_regs + nitems(db_regs);
   89 
   90 static int
   91 db_frame_seg(struct db_variable *vp, db_expr_t *valuep, int op)
   92 {
   93         uint16_t *reg;
   94 
   95         if (kdb_frame == NULL)
   96                 return (0);
   97 
   98         reg = (uint16_t *)((uintptr_t)kdb_frame + (db_expr_t)vp->valuep);
   99         if (op == DB_VAR_GET)
  100                 *valuep = *reg;
  101         else
  102                 *reg = *valuep;
  103         return (1);
  104 }
  105 
  106 static int
  107 db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
  108 {
  109         long *reg;
  110 
  111         if (kdb_frame == NULL)
  112                 return (0);
  113 
  114         reg = (long *)((uintptr_t)kdb_frame + (db_expr_t)vp->valuep);
  115         if (op == DB_VAR_GET)
  116                 *valuep = *reg;
  117         else
  118                 *reg = *valuep;
  119         return (1);
  120 }
  121 
  122 #define NORMAL          0
  123 #define TRAP            1
  124 #define INTERRUPT       2
  125 #define SYSCALL         3
  126 #define TRAP_INTERRUPT  5
  127 
  128 static void db_nextframe(struct amd64_frame **, db_addr_t *, struct thread *);
  129 static void db_print_stack_entry(const char *, db_addr_t, void *);
  130 static void decode_syscall(int, struct thread *);
  131 
  132 static const char * watchtype_str(int type);
  133 int  amd64_set_watch(int watchnum, unsigned long watchaddr, int size,
  134                     int access, struct dbreg *d);
  135 int  amd64_clr_watch(int watchnum, struct dbreg *d);
  136 
  137 static void
  138 db_print_stack_entry(const char *name, db_addr_t callpc, void *frame)
  139 {
  140 
  141         db_printf("%s() at ", name != NULL ? name : "??");
  142         db_printsym(callpc, DB_STGY_PROC);
  143         if (frame != NULL)
  144                 db_printf("/frame 0x%lx", (register_t)frame);
  145         db_printf("\n");
  146 }
  147 
  148 static void
  149 decode_syscall(int number, struct thread *td)
  150 {
  151         struct proc *p;
  152         c_db_sym_t sym;
  153         db_expr_t diff;
  154         sy_call_t *f;
  155         const char *symname;
  156 
  157         db_printf(" (%d", number);
  158         p = (td != NULL) ? td->td_proc : NULL;
  159         if (p != NULL && 0 <= number && number < p->p_sysent->sv_size) {
  160                 f = p->p_sysent->sv_table[number].sy_call;
  161                 sym = db_search_symbol((db_addr_t)f, DB_STGY_ANY, &diff);
  162                 if (sym != DB_SYM_NULL && diff == 0) {
  163                         db_symbol_values(sym, &symname, NULL);
  164                         db_printf(", %s, %s", p->p_sysent->sv_name, symname);
  165                 }
  166         }
  167         db_printf(")");
  168 }
  169 
  170 /*
  171  * Figure out the next frame up in the call stack.
  172  */
  173 static void
  174 db_nextframe(struct amd64_frame **fp, db_addr_t *ip, struct thread *td)
  175 {
  176         struct trapframe *tf;
  177         int frame_type;
  178         long rip, rsp, rbp;
  179         db_expr_t offset;
  180         c_db_sym_t sym;
  181         const char *name;
  182 
  183         rip = db_get_value((long) &(*fp)->f_retaddr, 8, FALSE);
  184         rbp = db_get_value((long) &(*fp)->f_frame, 8, FALSE);
  185 
  186         /*
  187          * Figure out frame type.  We look at the address just before
  188          * the saved instruction pointer as the saved EIP is after the
  189          * call function, and if the function being called is marked as
  190          * dead (such as panic() at the end of dblfault_handler()), then
  191          * the instruction at the saved EIP will be part of a different
  192          * function (syscall() in this example) rather than the one that
  193          * actually made the call.
  194          */
  195         frame_type = NORMAL;
  196         sym = db_search_symbol(rip - 1, DB_STGY_ANY, &offset);
  197         db_symbol_values(sym, &name, NULL);
  198         if (name != NULL) {
  199                 if (strcmp(name, "calltrap") == 0 ||
  200                     strcmp(name, "fork_trampoline") == 0 ||
  201                     strcmp(name, "mchk_calltrap") == 0 ||
  202                     strcmp(name, "nmi_calltrap") == 0 ||
  203                     strcmp(name, "Xdblfault") == 0)
  204                         frame_type = TRAP;
  205                 else if (strncmp(name, "Xatpic_intr", 11) == 0 ||
  206                     strncmp(name, "Xapic_isr", 9) == 0 ||
  207                     strcmp(name, "Xtimerint") == 0 ||
  208                     strcmp(name, "Xipi_intr_bitmap_handler") == 0 ||
  209                     strcmp(name, "Xcpustop") == 0 ||
  210                     strcmp(name, "Xcpususpend") == 0 ||
  211                     strcmp(name, "Xrendezvous") == 0)
  212                         frame_type = INTERRUPT;
  213                 else if (strcmp(name, "Xfast_syscall") == 0 ||
  214                     strcmp(name, "Xfast_syscall_pti") == 0 ||
  215                     strcmp(name, "fast_syscall_common") == 0)
  216                         frame_type = SYSCALL;
  217 #ifdef COMPAT_FREEBSD32
  218                 else if (strcmp(name, "Xint0x80_syscall") == 0)
  219                         frame_type = SYSCALL;
  220 #endif
  221                 /* XXX: These are interrupts with trap frames. */
  222                 else if (strcmp(name, "Xtimerint") == 0 ||
  223                     strcmp(name, "Xcpustop") == 0 ||
  224                     strcmp(name, "Xcpususpend") == 0 ||
  225                     strcmp(name, "Xrendezvous") == 0 ||
  226                     strcmp(name, "Xipi_intr_bitmap_handler") == 0)
  227                         frame_type = TRAP_INTERRUPT;
  228         }
  229 
  230         /*
  231          * Normal frames need no special processing.
  232          */
  233         if (frame_type == NORMAL) {
  234                 *ip = (db_addr_t) rip;
  235                 *fp = (struct amd64_frame *) rbp;
  236                 return;
  237         }
  238 
  239         db_print_stack_entry(name, rip, &(*fp)->f_frame);
  240 
  241         /*
  242          * Point to base of trapframe which is just above the
  243          * current frame.
  244          */
  245         tf = (struct trapframe *)((long)*fp + 16);
  246 
  247         if (INKERNEL((long) tf)) {
  248                 rsp = tf->tf_rsp;
  249                 rip = tf->tf_rip;
  250                 rbp = tf->tf_rbp;
  251                 switch (frame_type) {
  252                 case TRAP:
  253                         db_printf("--- trap %#r", tf->tf_trapno);
  254                         break;
  255                 case SYSCALL:
  256                         db_printf("--- syscall");
  257                         decode_syscall(tf->tf_rax, td);
  258                         break;
  259                 case TRAP_INTERRUPT:
  260                 case INTERRUPT:
  261                         db_printf("--- interrupt");
  262                         break;
  263                 default:
  264                         panic("The moon has moved again.");
  265                 }
  266                 db_printf(", rip = %#lr, rsp = %#lr, rbp = %#lr ---\n", rip,
  267                     rsp, rbp);
  268         }
  269 
  270         *ip = (db_addr_t) rip;
  271         *fp = (struct amd64_frame *) rbp;
  272 }
  273 
  274 static int
  275 db_backtrace(struct thread *td, struct trapframe *tf, struct amd64_frame *frame,
  276     db_addr_t pc, register_t sp, int count)
  277 {
  278         struct amd64_frame *actframe;
  279         const char *name;
  280         db_expr_t offset;
  281         c_db_sym_t sym;
  282         boolean_t first;
  283 
  284         if (count == -1)
  285                 count = 1024;
  286 
  287         first = TRUE;
  288         while (count-- && !db_pager_quit) {
  289                 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
  290                 db_symbol_values(sym, &name, NULL);
  291 
  292                 /*
  293                  * Attempt to determine a (possibly fake) frame that gives
  294                  * the caller's pc.  It may differ from `frame' if the
  295                  * current function never sets up a standard frame or hasn't
  296                  * set one up yet or has just discarded one.  The last two
  297                  * cases can be guessed fairly reliably for code generated
  298                  * by gcc.  The first case is too much trouble to handle in
  299                  * general because the amount of junk on the stack depends
  300                  * on the pc (the special handling of "calltrap", etc. in
  301                  * db_nextframe() works because the `next' pc is special).
  302                  */
  303                 actframe = frame;
  304                 if (first) {
  305                         first = FALSE;
  306                         if (sym == C_DB_SYM_NULL && sp != 0) {
  307                                 /*
  308                                  * If a symbol couldn't be found, we've probably
  309                                  * jumped to a bogus location, so try and use
  310                                  * the return address to find our caller.
  311                                  */
  312                                 db_print_stack_entry(name, pc, NULL);
  313                                 pc = db_get_value(sp, 8, FALSE);
  314                                 if (db_search_symbol(pc, DB_STGY_PROC,
  315                                     &offset) == C_DB_SYM_NULL)
  316                                         break;
  317                                 continue;
  318                         } else if (tf != NULL) {
  319                                 int instr;
  320 
  321                                 instr = db_get_value(pc, 4, FALSE);
  322                                 if ((instr & 0xffffffff) == 0xe5894855) {
  323                                         /* pushq %rbp; movq %rsp, %rbp */
  324                                         actframe = (void *)(tf->tf_rsp - 8);
  325                                 } else if ((instr & 0xffffff) == 0xe58948) {
  326                                         /* movq %rsp, %rbp */
  327                                         actframe = (void *)tf->tf_rsp;
  328                                         if (tf->tf_rbp == 0) {
  329                                                 /* Fake frame better. */
  330                                                 frame = actframe;
  331                                         }
  332                                 } else if ((instr & 0xff) == 0xc3) {
  333                                         /* ret */
  334                                         actframe = (void *)(tf->tf_rsp - 8);
  335                                 } else if (offset == 0) {
  336                                         /* Probably an assembler symbol. */
  337                                         actframe = (void *)(tf->tf_rsp - 8);
  338                                 }
  339                         } else if (name != NULL &&
  340                             strcmp(name, "fork_trampoline") == 0) {
  341                                 /*
  342                                  * Don't try to walk back on a stack for a
  343                                  * process that hasn't actually been run yet.
  344                                  */
  345                                 db_print_stack_entry(name, pc, actframe);
  346                                 break;
  347                         }
  348                 }
  349 
  350                 db_print_stack_entry(name, pc, actframe);
  351 
  352                 if (actframe != frame) {
  353                         /* `frame' belongs to caller. */
  354                         pc = (db_addr_t)
  355                             db_get_value((long)&actframe->f_retaddr, 8, FALSE);
  356                         continue;
  357                 }
  358 
  359                 db_nextframe(&frame, &pc, td);
  360 
  361                 if (INKERNEL((long)pc) && !INKERNEL((long)frame)) {
  362                         sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
  363                         db_symbol_values(sym, &name, NULL);
  364                         db_print_stack_entry(name, pc, frame);
  365                         break;
  366                 }
  367                 if (!INKERNEL((long) frame)) {
  368                         break;
  369                 }
  370         }
  371 
  372         return (0);
  373 }
  374 
  375 void
  376 db_trace_self(void)
  377 {
  378         struct amd64_frame *frame;
  379         db_addr_t callpc;
  380         register_t rbp;
  381 
  382         __asm __volatile("movq %%rbp,%0" : "=r" (rbp));
  383         frame = (struct amd64_frame *)rbp;
  384         callpc = (db_addr_t)db_get_value((long)&frame->f_retaddr, 8, FALSE);
  385         frame = frame->f_frame;
  386         db_backtrace(curthread, NULL, frame, callpc, 0, -1);
  387 }
  388 
  389 int
  390 db_trace_thread(struct thread *thr, int count)
  391 {
  392         struct pcb *ctx;
  393         struct trapframe *tf;
  394 
  395         ctx = kdb_thr_ctx(thr);
  396         tf = thr == kdb_thread ? kdb_frame : NULL;
  397         return (db_backtrace(thr, tf, (struct amd64_frame *)ctx->pcb_rbp,
  398             ctx->pcb_rip, ctx->pcb_rsp, count));
  399 }
  400 
  401 int
  402 amd64_set_watch(watchnum, watchaddr, size, access, d)
  403         int watchnum;
  404         unsigned long watchaddr;
  405         int size;
  406         int access;
  407         struct dbreg *d;
  408 {
  409         int i, len;
  410 
  411         if (watchnum == -1) {
  412                 for (i = 0; i < 4; i++)
  413                         if (!DBREG_DR7_ENABLED(d->dr[7], i))
  414                                 break;
  415                 if (i < 4)
  416                         watchnum = i;
  417                 else
  418                         return (-1);
  419         }
  420 
  421         switch (access) {
  422         case DBREG_DR7_EXEC:
  423                 size = 1; /* size must be 1 for an execution breakpoint */
  424                 /* fall through */
  425         case DBREG_DR7_WRONLY:
  426         case DBREG_DR7_RDWR:
  427                 break;
  428         default:
  429                 return (-1);
  430         }
  431 
  432         /*
  433          * we can watch a 1, 2, 4, or 8 byte sized location
  434          */
  435         switch (size) {
  436         case 1:
  437                 len = DBREG_DR7_LEN_1;
  438                 break;
  439         case 2:
  440                 len = DBREG_DR7_LEN_2;
  441                 break;
  442         case 4:
  443                 len = DBREG_DR7_LEN_4;
  444                 break;
  445         case 8:
  446                 len = DBREG_DR7_LEN_8;
  447                 break;
  448         default:
  449                 return (-1);
  450         }
  451 
  452         /* clear the bits we are about to affect */
  453         d->dr[7] &= ~DBREG_DR7_MASK(watchnum);
  454 
  455         /* set drN register to the address, N=watchnum */
  456         DBREG_DRX(d, watchnum) = watchaddr;
  457 
  458         /* enable the watchpoint */
  459         d->dr[7] |= DBREG_DR7_SET(watchnum, len, access,
  460             DBREG_DR7_GLOBAL_ENABLE);
  461 
  462         return (watchnum);
  463 }
  464 
  465 
  466 int
  467 amd64_clr_watch(watchnum, d)
  468         int watchnum;
  469         struct dbreg *d;
  470 {
  471 
  472         if (watchnum < 0 || watchnum >= 4)
  473                 return (-1);
  474 
  475         d->dr[7] &= ~DBREG_DR7_MASK(watchnum);
  476         DBREG_DRX(d, watchnum) = 0;
  477 
  478         return (0);
  479 }
  480 
  481 
  482 int
  483 db_md_set_watchpoint(addr, size)
  484         db_expr_t addr;
  485         db_expr_t size;
  486 {
  487         struct dbreg *d;
  488         struct pcpu *pc;
  489         int avail, c, cpu, i, wsize;
  490 
  491         d = (struct dbreg *)PCPU_PTR(dbreg);
  492         cpu = PCPU_GET(cpuid);
  493         fill_dbregs(NULL, d);
  494 
  495         avail = 0;
  496         for (i = 0; i < 4; i++) {
  497                 if (!DBREG_DR7_ENABLED(d->dr[7], i))
  498                         avail++;
  499         }
  500 
  501         if (avail * 8 < size)
  502                 return (-1);
  503 
  504         for (i = 0; i < 4 && size > 0; i++) {
  505                 if (!DBREG_DR7_ENABLED(d->dr[7], i)) {
  506                         if (size >= 8 || (avail == 1 && size > 4))
  507                                 wsize = 8;
  508                         else if (size > 2)
  509                                 wsize = 4;
  510                         else
  511                                 wsize = size;
  512                         amd64_set_watch(i, addr, wsize, DBREG_DR7_WRONLY, d);
  513                         addr += wsize;
  514                         size -= wsize;
  515                         avail--;
  516                 }
  517         }
  518 
  519         set_dbregs(NULL, d);
  520         CPU_FOREACH(c) {
  521                 if (c == cpu)
  522                         continue;
  523                 pc = pcpu_find(c);
  524                 memcpy(pc->pc_dbreg, d, sizeof(*d));
  525                 pc->pc_dbreg_cmd = PC_DBREG_CMD_LOAD;
  526         }
  527 
  528         return (0);
  529 }
  530 
  531 int
  532 db_md_clr_watchpoint(addr, size)
  533         db_expr_t addr;
  534         db_expr_t size;
  535 {
  536         struct dbreg *d;
  537         struct pcpu *pc;
  538         int i, c, cpu;
  539 
  540         d = (struct dbreg *)PCPU_PTR(dbreg);
  541         cpu = PCPU_GET(cpuid);
  542         fill_dbregs(NULL, d);
  543 
  544         for (i = 0; i < 4; i++) {
  545                 if (DBREG_DR7_ENABLED(d->dr[7], i)) {
  546                         if (DBREG_DRX((d), i) >= addr &&
  547                             DBREG_DRX((d), i) < addr + size)
  548                                 amd64_clr_watch(i, d);
  549 
  550                 }
  551         }
  552 
  553         set_dbregs(NULL, d);
  554         CPU_FOREACH(c) {
  555                 if (c == cpu)
  556                         continue;
  557                 pc = pcpu_find(c);
  558                 memcpy(pc->pc_dbreg, d, sizeof(*d));
  559                 pc->pc_dbreg_cmd = PC_DBREG_CMD_LOAD;
  560         }
  561 
  562         return (0);
  563 }
  564 
  565 
  566 static const char *
  567 watchtype_str(type)
  568         int type;
  569 {
  570         switch (type) {
  571                 case DBREG_DR7_EXEC   : return "execute";    break;
  572                 case DBREG_DR7_RDWR   : return "read/write"; break;
  573                 case DBREG_DR7_WRONLY : return "write";      break;
  574                 default               : return "invalid";    break;
  575         }
  576 }
  577 
  578 
  579 void
  580 db_md_list_watchpoints(void)
  581 {
  582         struct dbreg d;
  583         int i, len, type;
  584 
  585         fill_dbregs(NULL, &d);
  586 
  587         db_printf("\nhardware watchpoints:\n");
  588         db_printf("  watch    status        type  len             address\n");
  589         db_printf("  -----  --------  ----------  ---  ------------------\n");
  590         for (i = 0; i < 4; i++) {
  591                 if (DBREG_DR7_ENABLED(d.dr[7], i)) {
  592                         type = DBREG_DR7_ACCESS(d.dr[7], i);
  593                         len = DBREG_DR7_LEN(d.dr[7], i);
  594                         if (len == DBREG_DR7_LEN_8)
  595                                 len = 8;
  596                         else
  597                                 len++;
  598                         db_printf("  %-5d  %-8s  %10s  %3d  ",
  599                             i, "enabled", watchtype_str(type), len);
  600                         db_printsym((db_addr_t)DBREG_DRX(&d, i), DB_STGY_ANY);
  601                         db_printf("\n");
  602                 } else {
  603                         db_printf("  %-5d  disabled\n", i);
  604                 }
  605         }
  606 
  607         db_printf("\ndebug register values:\n");
  608         for (i = 0; i < 8; i++)
  609                 if (i != 4 && i != 5)
  610                         db_printf("  dr%d 0x%016lx\n", i, DBREG_DRX(&d, i));
  611         db_printf("\n");
  612 }
  613 
  614 void
  615 amd64_db_resume_dbreg(void)
  616 {
  617         struct dbreg *d;
  618 
  619         switch (PCPU_GET(dbreg_cmd)) {
  620         case PC_DBREG_CMD_LOAD:
  621                 d = (struct dbreg *)PCPU_PTR(dbreg);
  622                 set_dbregs(NULL, d);
  623                 PCPU_SET(dbreg_cmd, PC_DBREG_CMD_NONE);
  624                 break;
  625         }
  626 }

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