undefined.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 /*      $NetBSD: undefined.c,v 1.22 2003/11/29 22:21:29 bjh21 Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 2001 Ben Harris.
    5  * Copyright (c) 1995 Mark Brinicombe.
    6  * Copyright (c) 1995 Brini.
    7  * All rights reserved.
    8  *
    9  * This code is derived from software written for Brini by Mark Brinicombe
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. All advertising materials mentioning features or use of this software
   20  *    must display the following acknowledgement:
   21  *      This product includes software developed by Brini.
   22  * 4. The name of the company nor the name of the author may be used to
   23  *    endorse or promote products derived from this software without specific
   24  *    prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
   27  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   28  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   29  * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
   30  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   31  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   32  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  * RiscBSD kernel project
   39  *
   40  * undefined.c
   41  *
   42  * Fault handler
   43  *
   44  * Created      : 06/01/95
   45  */
   46 
   47 
   48 #include "opt_ddb.h"
   49 
   50 #include <sys/cdefs.h>
   51 __FBSDID("$FreeBSD: releng/6.0/sys/arm/arm/undefined.c 144971 2005-04-12 23:18:54Z jhb $");
   52 
   53 #include <sys/param.h>
   54 #include <sys/malloc.h>
   55 #include <sys/queue.h>
   56 #include <sys/signal.h>
   57 #include <sys/systm.h>
   58 #include <sys/proc.h>
   59 #include <sys/syslog.h>
   60 #include <sys/vmmeter.h>
   61 #include <sys/types.h>
   62 #include <sys/lock.h>
   63 #include <sys/mutex.h>
   64 #include <sys/signalvar.h>
   65 #include <sys/ptrace.h>
   66 #ifdef KDB
   67 #include <sys/kdb.h>
   68 #endif
   69 #ifdef FAST_FPE
   70 #include <sys/acct.h>
   71 #endif
   72 
   73 #include <vm/vm.h>
   74 #include <vm/vm_extern.h>
   75 
   76 #include <machine/asm.h>
   77 #include <machine/cpu.h>
   78 #include <machine/frame.h>
   79 #include <machine/undefined.h>
   80 #include <machine/trap.h>
   81 
   82 #include <machine/disassem.h>
   83 
   84 #ifdef DDB
   85 #include <ddb/db_output.h>
   86 #include <machine/db_machdep.h>
   87 #endif
   88 
   89 #ifdef acorn26
   90 #include <machine/machdep.h>
   91 #endif
   92 
   93 static int gdb_trapper(u_int, u_int, struct trapframe *, int);
   94 #ifdef FAST_FPE
   95 extern int want_resched;
   96 #endif
   97 
   98 LIST_HEAD(, undefined_handler) undefined_handlers[MAX_COPROCS];
   99 
  100 
  101 void *
  102 install_coproc_handler(int coproc, undef_handler_t handler)
  103 {
  104         struct undefined_handler *uh;
  105 
  106         KASSERT(coproc >= 0 && coproc < MAX_COPROCS, ("bad coproc"));
  107         KASSERT(handler != NULL, ("handler is NULL")); /* Used to be legal. */
  108 
  109         /* XXX: M_TEMP??? */
  110         MALLOC(uh, struct undefined_handler *, sizeof(*uh), M_TEMP, M_WAITOK);
  111         uh->uh_handler = handler;
  112         install_coproc_handler_static(coproc, uh);
  113         return uh;
  114 }
  115 
  116 void
  117 install_coproc_handler_static(int coproc, struct undefined_handler *uh)
  118 {
  119 
  120         LIST_INSERT_HEAD(&undefined_handlers[coproc], uh, uh_link);
  121 }
  122 
  123 void
  124 remove_coproc_handler(void *cookie)
  125 {
  126         struct undefined_handler *uh = cookie;
  127 
  128         LIST_REMOVE(uh, uh_link);
  129         FREE(uh, M_TEMP);
  130 }
  131 
  132 
  133 static int
  134 gdb_trapper(u_int addr, u_int insn, struct trapframe *frame, int code)
  135 {
  136         struct thread *td;
  137         td = (curthread == NULL) ? &thread0 : curthread;
  138 
  139         if (insn == GDB_BREAKPOINT || insn == GDB5_BREAKPOINT) {
  140                 if (code == FAULT_USER) {
  141                         trapsignal(td, SIGTRAP, 0);
  142                         return 0;
  143                 }
  144 #if 0
  145 #ifdef KGDB
  146                 return !kgdb_trap(T_BREAKPOINT, frame);
  147 #endif
  148 #endif
  149         }
  150         return 1;
  151 }
  152 
  153 static struct undefined_handler gdb_uh;
  154 
  155 void
  156 undefined_init()
  157 {
  158         int loop;
  159 
  160         /* Not actually necessary -- the initialiser is just NULL */
  161         for (loop = 0; loop < MAX_COPROCS; ++loop)
  162                 LIST_INIT(&undefined_handlers[loop]);
  163 
  164         /* Install handler for GDB breakpoints */
  165         gdb_uh.uh_handler = gdb_trapper;
  166         install_coproc_handler_static(0, &gdb_uh);
  167 }
  168 
  169 
  170 void
  171 undefinedinstruction(trapframe_t *frame)
  172 {
  173         struct thread *td;
  174         u_int fault_pc;
  175         int fault_instruction;
  176         int fault_code;
  177         int coprocessor;
  178         struct undefined_handler *uh;
  179 #ifdef VERBOSE_ARM32
  180         int s;
  181 #endif
  182 
  183         /* Enable interrupts if they were enabled before the exception. */
  184         if (!(frame->tf_spsr & I32_bit))
  185                 enable_interrupts(I32_bit);
  186 
  187         frame->tf_pc -= INSN_SIZE;
  188         PCPU_LAZY_INC(cnt.v_trap);
  189 
  190         fault_pc = frame->tf_pc;
  191 
  192         /* 
  193          * Get the current thread/proc structure or thread0/proc0 if there is 
  194          * none.
  195          */
  196         td = curthread == NULL ? &thread0 : curthread;
  197 
  198         /*
  199          * Make sure the program counter is correctly aligned so we
  200          * don't take an alignment fault trying to read the opcode.
  201          */
  202         if (__predict_false((fault_pc & 3) != 0)) {
  203                 trapsignal(td, SIGILL, 0);
  204                 userret(td, frame, 0);
  205                 return;
  206         }
  207 
  208         /*
  209          * Should use fuword() here .. but in the interests of squeezing every
  210          * bit of speed we will just use ReadWord(). We know the instruction
  211          * can be read as was just executed so this will never fail unless the
  212          * kernel is screwed up in which case it does not really matter does
  213          * it ?
  214          */
  215 
  216         fault_instruction = *(u_int32_t *)fault_pc;
  217 
  218         /* Update vmmeter statistics */
  219 #if 0
  220         uvmexp.traps++;
  221 #endif
  222         /* Check for coprocessor instruction */
  223 
  224         /*
  225          * According to the datasheets you only need to look at bit 27 of the
  226          * instruction to tell the difference between and undefined
  227          * instruction and a coprocessor instruction following an undefined
  228          * instruction trap.
  229          */
  230 
  231         if ((fault_instruction & (1 << 27)) != 0)
  232                 coprocessor = (fault_instruction >> 8) & 0x0f;
  233         else
  234                 coprocessor = 0;
  235 
  236         if ((frame->tf_spsr & PSR_MODE) == PSR_USR32_MODE) {
  237                 /*
  238                  * Modify the fault_code to reflect the USR/SVC state at
  239                  * time of fault.
  240                  */
  241                 fault_code = FAULT_USER;
  242                 td->td_frame = frame;
  243         } else
  244                 fault_code = 0;
  245 
  246         /* OK this is were we do something about the instruction. */
  247         LIST_FOREACH(uh, &undefined_handlers[coprocessor], uh_link)
  248             if (uh->uh_handler(fault_pc, fault_instruction, frame,
  249                                fault_code) == 0)
  250                     break;
  251 
  252         if (fault_code & FAULT_USER && fault_instruction == PTRACE_BREAKPOINT) {
  253                 ptrace_clear_single_step(td);
  254                 return;
  255         }
  256 
  257         if (uh == NULL && (fault_code & FAULT_USER)) {
  258                 /* Fault has not been handled */
  259                 trapsignal(td, SIGILL, 0);
  260         }
  261 
  262         if ((fault_code & FAULT_USER) == 0) {
  263                 if (fault_instruction == KERNEL_BREAKPOINT) {
  264 #ifdef KDB
  265                 kdb_trap(T_BREAKPOINT, 0, frame);
  266 #else
  267                 printf("No debugger in kernel.\n");
  268 #endif
  269                 return;
  270                 } else
  271                         panic("Undefined instruction in kernel.\n");
  272         }
  273 
  274 #ifdef FAST_FPE
  275         /* Optimised exit code */
  276         {
  277 
  278                 /*
  279                  * Check for reschedule request, at the moment there is only
  280                  * 1 ast so this code should always be run
  281                  */
  282 
  283                 if (want_resched) {
  284                         /*
  285                          * We are being preempted.
  286                          */
  287                         preempt(0);
  288                 }
  289 
  290                 /* Invoke MI userret code */
  291                 mi_userret(td);
  292 
  293 #if 0
  294                 l->l_priority = l->l_usrpri;
  295 
  296                 curcpu()->ci_schedstate.spc_curpriority = l->l_priority;
  297 #endif
  298         }
  299 
  300 #else
  301         userret(td, frame, 0);
  302 #endif
  303 }

Cache object: 7a12abc85f6e42047d423f6b886c59ec

[ 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.

FreeBSD/Linux Kernel Cross Reference sys/arm/arm/undefined.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/undefined.c