The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powerpc/db_trace.c

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    1 /*      $FreeBSD: releng/8.0/sys/powerpc/powerpc/db_trace.c 176742 2008-03-02 17:05:57Z raj $ */
    2 /*      $NetBSD: db_trace.c,v 1.20 2002/05/13 20:30:09 matt Exp $       */
    3 /*      $OpenBSD: db_trace.c,v 1.3 1997/03/21 02:10:48 niklas Exp $     */
    4 
    5 /*-
    6  * Mach Operating System
    7  * Copyright (c) 1992 Carnegie Mellon University
    8  * All Rights Reserved.
    9  *
   10  * Permission to use, copy, modify and distribute this software and its
   11  * documentation is hereby granted, provided that both the copyright
   12  * notice and this permission notice appear in all copies of the
   13  * software, derivative works or modified versions, and any portions
   14  * thereof, and that both notices appear in supporting documentation.
   15  *
   16  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   17  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   18  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   19  *
   20  * Carnegie Mellon requests users of this software to return to
   21  *
   22  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   23  *  School of Computer Science
   24  *  Carnegie Mellon University
   25  *  Pittsburgh PA 15213-3890
   26  *
   27  * any improvements or extensions that they make and grant Carnegie Mellon
   28  * the rights to redistribute these changes.
   29  */
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/kdb.h>
   34 #include <sys/proc.h>
   35 #include <sys/stack.h>
   36 
   37 #include <vm/vm.h>
   38 #include <vm/pmap.h>
   39 #include <vm/vm_extern.h>
   40 
   41 #include <machine/db_machdep.h>
   42 #include <machine/pcb.h>
   43 #include <machine/spr.h>
   44 #include <machine/stack.h>
   45 #include <machine/trap.h>
   46 
   47 #include <ddb/ddb.h>
   48 #include <ddb/db_access.h>
   49 #include <ddb/db_sym.h>
   50 #include <ddb/db_variables.h>
   51 
   52 static db_varfcn_t db_frame;
   53 
   54 #define DB_OFFSET(x)    (db_expr_t *)offsetof(struct trapframe, x)
   55 
   56 struct db_variable db_regs[] = {
   57         { "r0",  DB_OFFSET(fixreg[0]),  db_frame },
   58         { "r1",  DB_OFFSET(fixreg[1]),  db_frame },
   59         { "r2",  DB_OFFSET(fixreg[2]),  db_frame },
   60         { "r3",  DB_OFFSET(fixreg[3]),  db_frame },
   61         { "r4",  DB_OFFSET(fixreg[4]),  db_frame },
   62         { "r5",  DB_OFFSET(fixreg[5]),  db_frame },
   63         { "r6",  DB_OFFSET(fixreg[6]),  db_frame },
   64         { "r7",  DB_OFFSET(fixreg[7]),  db_frame },
   65         { "r8",  DB_OFFSET(fixreg[8]),  db_frame },
   66         { "r9",  DB_OFFSET(fixreg[9]),  db_frame },
   67         { "r10", DB_OFFSET(fixreg[10]), db_frame },
   68         { "r11", DB_OFFSET(fixreg[11]), db_frame },
   69         { "r12", DB_OFFSET(fixreg[12]), db_frame },
   70         { "r13", DB_OFFSET(fixreg[13]), db_frame },
   71         { "r14", DB_OFFSET(fixreg[14]), db_frame },
   72         { "r15", DB_OFFSET(fixreg[15]), db_frame },
   73         { "r16", DB_OFFSET(fixreg[16]), db_frame },
   74         { "r17", DB_OFFSET(fixreg[17]), db_frame },
   75         { "r18", DB_OFFSET(fixreg[18]), db_frame },
   76         { "r19", DB_OFFSET(fixreg[19]), db_frame },
   77         { "r20", DB_OFFSET(fixreg[20]), db_frame },
   78         { "r21", DB_OFFSET(fixreg[21]), db_frame },
   79         { "r22", DB_OFFSET(fixreg[22]), db_frame },
   80         { "r23", DB_OFFSET(fixreg[23]), db_frame },
   81         { "r24", DB_OFFSET(fixreg[24]), db_frame },
   82         { "r25", DB_OFFSET(fixreg[25]), db_frame },
   83         { "r26", DB_OFFSET(fixreg[26]), db_frame },
   84         { "r27", DB_OFFSET(fixreg[27]), db_frame },
   85         { "r28", DB_OFFSET(fixreg[28]), db_frame },
   86         { "r29", DB_OFFSET(fixreg[29]), db_frame },
   87         { "r30", DB_OFFSET(fixreg[30]), db_frame },
   88         { "r31", DB_OFFSET(fixreg[31]), db_frame },
   89         { "srr0", DB_OFFSET(srr0),      db_frame },
   90         { "srr1", DB_OFFSET(srr1),      db_frame },
   91         { "lr",  DB_OFFSET(lr),         db_frame },
   92         { "ctr", DB_OFFSET(ctr),        db_frame },
   93         { "cr",  DB_OFFSET(cr),         db_frame },
   94         { "xer", DB_OFFSET(xer),        db_frame },
   95 #ifdef AIM
   96         { "dar", DB_OFFSET(cpu.aim.dar),        db_frame },
   97         { "dsisr", DB_OFFSET(cpu.aim.dsisr),    db_frame },
   98 #endif
   99 #ifdef E500
  100         { "dear", DB_OFFSET(cpu.booke.dear),    db_frame },
  101         { "esr", DB_OFFSET(cpu.booke.esr),      db_frame },
  102 #endif
  103 };
  104 struct db_variable *db_eregs = db_regs + sizeof (db_regs)/sizeof (db_regs[0]);
  105 
  106 /*
  107  * register variable handling
  108  */
  109 static int
  110 db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
  111 {
  112         uint32_t *reg;
  113 
  114         if (kdb_frame == NULL)
  115                 return (0);
  116         reg = (uint32_t*)((uintptr_t)kdb_frame + (uintptr_t)vp->valuep);
  117         if (op == DB_VAR_GET)
  118                 *valuep = *reg;
  119         else
  120                 *reg = *valuep;
  121         return (1);
  122 }
  123 
  124 
  125 /*
  126  *      Frame tracing.
  127  */
  128 static int
  129 db_backtrace(struct thread *td, db_addr_t fp, int count)
  130 {
  131         db_addr_t stackframe, lr, *args;
  132         db_expr_t diff;
  133         c_db_sym_t sym;
  134         const char *symname;
  135         boolean_t kernel_only = TRUE;
  136         boolean_t full = FALSE;
  137 
  138 #if 0
  139         {
  140                 register char *cp = modif;
  141                 register char c;
  142 
  143                 while ((c = *cp++) != 0) {
  144                         if (c == 't')
  145                                 trace_thread = TRUE;
  146                         if (c == 'u')
  147                                 kernel_only = FALSE;
  148                         if (c == 'f')
  149                                 full = TRUE;
  150                 }
  151         }
  152 #endif
  153 
  154         stackframe = fp;
  155 
  156         while (!db_pager_quit) {
  157                 if (stackframe < PAGE_SIZE)
  158                         break;
  159 
  160                 /*
  161                  * Locate the next frame by grabbing the backchain ptr
  162                  * from frame[0]
  163                  */
  164                 stackframe = *(db_addr_t *)stackframe;
  165 
  166         next_frame:
  167                 /* The saved arg values start at frame[2] */
  168                 args = (db_addr_t *)(stackframe + 8);
  169 
  170                 if (stackframe < PAGE_SIZE)
  171                         break;
  172 
  173                 if (count-- == 0)
  174                         break;
  175 
  176                 /*
  177                  * Extract link register from frame and subtract
  178                  * 4 to convert into calling address (as opposed to
  179                  * return address)
  180                  */
  181                 lr = *(db_addr_t *)(stackframe + 4) - 4;
  182                 if ((lr & 3) || (lr < 0x100)) {
  183                         db_printf("saved LR(0x%x) is invalid.", lr);
  184                         break;
  185                 }
  186 
  187                 db_printf("0x%08x: ", stackframe);
  188 
  189                 /*
  190                  * The trap code labels the return addresses from the
  191                  * call to C code as 'trapexit' and 'asttrapexit. Use this
  192                  * to determine if the callframe has to traverse a saved
  193                  * trap context
  194                  */
  195                 if ((lr + 4 == (db_addr_t) &trapexit) ||
  196                     (lr + 4 == (db_addr_t) &asttrapexit)) {
  197                         const char *trapstr;
  198                         struct trapframe *tf = (struct trapframe *)
  199                                 (stackframe+8);
  200                         db_printf("%s ", tf->srr1 & PSL_PR ? "user" : "kernel");
  201                         switch (tf->exc) {
  202                         case EXC_DSI:
  203                                 /* XXX take advantage of the union. */
  204                                 db_printf("DSI %s trap @ %#x by ",
  205                                     (tf->cpu.aim.dsisr & DSISR_STORE) ? "write"
  206                                     : "read", tf->cpu.aim.dar);
  207                                 goto print_trap;
  208                         case EXC_ALI:
  209                                 /* XXX take advantage of the union. */
  210                                 db_printf("ALI trap @ %#x (xSR %#x) ",
  211                                     tf->cpu.aim.dar, tf->cpu.aim.dsisr);
  212                                 goto print_trap;
  213                         case EXC_ISI: trapstr = "ISI"; break;
  214                         case EXC_PGM: trapstr = "PGM"; break;
  215                         case EXC_SC: trapstr = "SC"; break;
  216                         case EXC_EXI: trapstr = "EXI"; break;
  217                         case EXC_MCHK: trapstr = "MCHK"; break;
  218 #ifndef E500
  219                         case EXC_VEC: trapstr = "VEC"; break;
  220                         case EXC_FPA: trapstr = "FPA"; break;
  221                         case EXC_BPT: trapstr = "BPT"; break;
  222                         case EXC_TRC: trapstr = "TRC"; break;
  223                         case EXC_RUNMODETRC: trapstr = "RUNMODETRC"; break;
  224                         case EXC_SMI: trapstr = "SMI"; break;
  225                         case EXC_RST: trapstr = "RST"; break;
  226 #endif
  227                         case EXC_FPU: trapstr = "FPU"; break;
  228                         case EXC_DECR: trapstr = "DECR"; break;
  229                         case EXC_PERF: trapstr = "PERF"; break;
  230                         default: trapstr = NULL; break;
  231                         }
  232                         if (trapstr != NULL) {
  233                                 db_printf("%s trap by ", trapstr);
  234                         } else {
  235                                 db_printf("trap %#x by ", tf->exc);
  236                         }
  237 
  238                    print_trap:
  239                         lr = (db_addr_t) tf->srr0;
  240                         diff = 0;
  241                         symname = NULL;
  242                         sym = db_search_symbol(lr, DB_STGY_ANY, &diff);
  243                         db_symbol_values(sym, &symname, 0);
  244                         if (symname == NULL || !strcmp(symname, "end")) {
  245                                 db_printf("%#x: srr1=%#x\n", lr, tf->srr1);
  246                         } else {
  247                                 db_printf("%s+%#x: srr1=%#x\n", symname, diff,
  248                                     tf->srr1);
  249                         }
  250                         db_printf("%-10s  r1=%#x cr=%#x xer=%#x ctr=%#x",
  251                             "", tf->fixreg[1], tf->cr, tf->xer, tf->ctr);
  252                         if (tf->exc == EXC_DSI)
  253                                 db_printf(" sr=%#x", tf->cpu.aim.dsisr);
  254                         db_printf("\n");
  255                         stackframe = (db_addr_t) tf->fixreg[1];
  256                         if (kernel_only && (tf->srr1 & PSL_PR))
  257                                 break;
  258                         goto next_frame;
  259                 }
  260 
  261                 diff = 0;
  262                 symname = NULL;
  263                 sym = db_search_symbol(lr, DB_STGY_ANY, &diff);
  264                 db_symbol_values(sym, &symname, 0);
  265                 if (symname == NULL || !strcmp(symname, "end"))
  266                         db_printf("at %x", lr);
  267                 else
  268                         db_printf("at %s+%#x", symname, diff);
  269                 if (full)
  270                         /* Print all the args stored in that stackframe. */
  271                         db_printf("(%x, %x, %x, %x, %x, %x, %x, %x)",
  272                                 args[0], args[1], args[2], args[3],
  273                                 args[4], args[5], args[6], args[7]);
  274                 db_printf("\n");
  275         }
  276 
  277         return (0);
  278 }
  279 
  280 void
  281 db_trace_self(void)
  282 {
  283         db_addr_t addr;
  284 
  285         addr = (db_addr_t)__builtin_frame_address(1);
  286         db_backtrace(curthread, addr, -1);
  287 }
  288 
  289 int
  290 db_trace_thread(struct thread *td, int count)
  291 {
  292         struct pcb *ctx;
  293 
  294         ctx = kdb_thr_ctx(td);
  295         return (db_backtrace(td, (db_addr_t)ctx->pcb_sp, count));
  296 }

Cache object: b4c5066015537d055ab06facd293847d


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.