undefined.c

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    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/9.0/sys/arm/arm/undefined.c 196484 2009-08-23 23:37:53Z cognet $");
   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/lock.h>
   62 #include <sys/mutex.h>
   63 #include <sys/signalvar.h>
   64 #include <sys/ptrace.h>
   65 #ifdef KDB
   66 #include <sys/kdb.h>
   67 #endif
   68 #ifdef FAST_FPE
   69 #include <sys/acct.h>
   70 #endif
   71 
   72 #include <vm/vm.h>
   73 #include <vm/vm_extern.h>
   74 
   75 #include <machine/asm.h>
   76 #include <machine/cpu.h>
   77 #include <machine/frame.h>
   78 #include <machine/undefined.h>
   79 #include <machine/trap.h>
   80 
   81 #include <machine/disassem.h>
   82 
   83 #ifdef DDB
   84 #include <ddb/db_output.h>
   85 #endif
   86 
   87 #ifdef KDB
   88 #include <machine/db_machdep.h>
   89 #endif
   90 
   91 static int gdb_trapper(u_int, u_int, struct trapframe *, int);
   92 #ifdef FAST_FPE
   93 extern int want_resched;
   94 #endif
   95 
   96 LIST_HEAD(, undefined_handler) undefined_handlers[MAX_COPROCS];
   97 
   98 
   99 void *
  100 install_coproc_handler(int coproc, undef_handler_t handler)
  101 {
  102         struct undefined_handler *uh;
  103 
  104         KASSERT(coproc >= 0 && coproc < MAX_COPROCS, ("bad coproc"));
  105         KASSERT(handler != NULL, ("handler is NULL")); /* Used to be legal. */
  106 
  107         /* XXX: M_TEMP??? */
  108         uh = malloc(sizeof(*uh), M_TEMP, M_WAITOK);
  109         uh->uh_handler = handler;
  110         install_coproc_handler_static(coproc, uh);
  111         return uh;
  112 }
  113 
  114 void
  115 install_coproc_handler_static(int coproc, struct undefined_handler *uh)
  116 {
  117 
  118         LIST_INSERT_HEAD(&undefined_handlers[coproc], uh, uh_link);
  119 }
  120 
  121 void
  122 remove_coproc_handler(void *cookie)
  123 {
  124         struct undefined_handler *uh = cookie;
  125 
  126         LIST_REMOVE(uh, uh_link);
  127         free(uh, M_TEMP);
  128 }
  129 
  130 
  131 static int
  132 gdb_trapper(u_int addr, u_int insn, struct trapframe *frame, int code)
  133 {
  134         struct thread *td;
  135         ksiginfo_t ksi;
  136 
  137         td = (curthread == NULL) ? &thread0 : curthread;
  138 
  139         if (insn == GDB_BREAKPOINT || insn == GDB5_BREAKPOINT) {
  140                 if (code == FAULT_USER) {
  141                         ksiginfo_init_trap(&ksi);
  142                         ksi.ksi_signo = SIGTRAP;
  143                         ksi.ksi_code = TRAP_BRKPT;
  144                         ksi.ksi_addr = (u_int32_t *)addr;
  145                         trapsignal(td, &ksi);
  146                         return 0;
  147                 }
  148 #if 0
  149 #ifdef KGDB
  150                 return !kgdb_trap(T_BREAKPOINT, frame);
  151 #endif
  152 #endif
  153         }
  154         return 1;
  155 }
  156 
  157 static struct undefined_handler gdb_uh;
  158 
  159 void
  160 undefined_init()
  161 {
  162         int loop;
  163 
  164         /* Not actually necessary -- the initialiser is just NULL */
  165         for (loop = 0; loop < MAX_COPROCS; ++loop)
  166                 LIST_INIT(&undefined_handlers[loop]);
  167 
  168         /* Install handler for GDB breakpoints */
  169         gdb_uh.uh_handler = gdb_trapper;
  170         install_coproc_handler_static(0, &gdb_uh);
  171 }
  172 
  173 
  174 void
  175 undefinedinstruction(trapframe_t *frame)
  176 {
  177         struct thread *td;
  178         u_int fault_pc;
  179         int fault_instruction;
  180         int fault_code;
  181         int coprocessor;
  182         struct undefined_handler *uh;
  183 #ifdef VERBOSE_ARM32
  184         int s;
  185 #endif
  186         ksiginfo_t ksi;
  187 
  188         /* Enable interrupts if they were enabled before the exception. */
  189         if (!(frame->tf_spsr & I32_bit))
  190                 enable_interrupts(I32_bit|F32_bit);
  191 
  192         frame->tf_pc -= INSN_SIZE;
  193         PCPU_INC(cnt.v_trap);
  194 
  195         fault_pc = frame->tf_pc;
  196 
  197         /* 
  198          * Get the current thread/proc structure or thread0/proc0 if there is 
  199          * none.
  200          */
  201         td = curthread == NULL ? &thread0 : curthread;
  202 
  203         /*
  204          * Make sure the program counter is correctly aligned so we
  205          * don't take an alignment fault trying to read the opcode.
  206          */
  207         if (__predict_false((fault_pc & 3) != 0)) {
  208                 ksiginfo_init_trap(&ksi);
  209                 ksi.ksi_signo = SIGILL;
  210                 ksi.ksi_code = ILL_ILLADR;
  211                 ksi.ksi_addr = (u_int32_t *)(intptr_t) fault_pc;
  212                 trapsignal(td, &ksi);
  213                 userret(td, frame);
  214                 return;
  215         }
  216 
  217         /*
  218          * Should use fuword() here .. but in the interests of squeezing every
  219          * bit of speed we will just use ReadWord(). We know the instruction
  220          * can be read as was just executed so this will never fail unless the
  221          * kernel is screwed up in which case it does not really matter does
  222          * it ?
  223          */
  224 
  225         fault_instruction = *(u_int32_t *)fault_pc;
  226 
  227         /* Update vmmeter statistics */
  228 #if 0
  229         uvmexp.traps++;
  230 #endif
  231         /* Check for coprocessor instruction */
  232 
  233         /*
  234          * According to the datasheets you only need to look at bit 27 of the
  235          * instruction to tell the difference between and undefined
  236          * instruction and a coprocessor instruction following an undefined
  237          * instruction trap.
  238          */
  239 
  240         if ((fault_instruction & (1 << 27)) != 0)
  241                 coprocessor = (fault_instruction >> 8) & 0x0f;
  242         else
  243                 coprocessor = 0;
  244 
  245         if ((frame->tf_spsr & PSR_MODE) == PSR_USR32_MODE) {
  246                 /*
  247                  * Modify the fault_code to reflect the USR/SVC state at
  248                  * time of fault.
  249                  */
  250                 fault_code = FAULT_USER;
  251                 td->td_frame = frame;
  252         } else
  253                 fault_code = 0;
  254 
  255         /* OK this is were we do something about the instruction. */
  256         LIST_FOREACH(uh, &undefined_handlers[coprocessor], uh_link)
  257             if (uh->uh_handler(fault_pc, fault_instruction, frame,
  258                                fault_code) == 0)
  259                     break;
  260 
  261         if (fault_code & FAULT_USER && fault_instruction == PTRACE_BREAKPOINT) {
  262                 PROC_LOCK(td->td_proc);
  263                 _PHOLD(td->td_proc);
  264                 ptrace_clear_single_step(td);
  265                 _PRELE(td->td_proc);
  266                 PROC_UNLOCK(td->td_proc);
  267                 return;
  268         }
  269 
  270         if (uh == NULL && (fault_code & FAULT_USER)) {
  271                 /* Fault has not been handled */
  272                 ksiginfo_init_trap(&ksi);
  273                 ksi.ksi_signo = SIGILL;
  274                 ksi.ksi_code = ILL_ILLOPC;
  275                 ksi.ksi_addr = (u_int32_t *)(intptr_t) fault_pc;
  276                 trapsignal(td, &ksi);
  277         }
  278 
  279         if ((fault_code & FAULT_USER) == 0) {
  280                 if (fault_instruction == KERNEL_BREAKPOINT) {
  281 #ifdef KDB
  282                         kdb_trap(T_BREAKPOINT, 0, frame);
  283 #else
  284                         printf("No debugger in kernel.\n");
  285 #endif
  286                         return;
  287                 } else
  288                         panic("Undefined instruction in kernel.\n");
  289         }
  290 
  291 #ifdef FAST_FPE
  292         /* Optimised exit code */
  293         {
  294 
  295                 /*
  296                  * Check for reschedule request, at the moment there is only
  297                  * 1 ast so this code should always be run
  298                  */
  299 
  300                 if (want_resched) {
  301                         /*
  302                          * We are being preempted.
  303                          */
  304                         preempt(0);
  305                 }
  306 
  307                 /* Invoke MI userret code */
  308                 mi_userret(td);
  309 
  310 #if 0
  311                 l->l_priority = l->l_usrpri;
  312 
  313                 curcpu()->ci_schedstate.spc_curpriority = l->l_priority;
  314 #endif
  315         }
  316 
  317 #else
  318         userret(td, frame);
  319 #endif
  320 }
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FreeBSD/Linux Kernel Cross Reference sys/arm/arm/undefined.c

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