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("$FreeBSD$");
   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 
   69 #include <vm/vm.h>
   70 #include <vm/vm_extern.h>
   71 
   72 #include <machine/armreg.h>
   73 #include <machine/asm.h>
   74 #include <machine/cpu.h>
   75 #include <machine/frame.h>
   76 #include <machine/undefined.h>
   77 #include <machine/trap.h>
   78 
   79 #include <machine/disassem.h>
   80 
   81 #ifdef DDB
   82 #include <ddb/db_output.h>
   83 #endif
   84 
   85 #ifdef KDB
   86 #include <machine/db_machdep.h>
   87 #endif
   88 
   89 static int gdb_trapper(u_int, u_int, struct trapframe *, int);
   90 
   91 LIST_HEAD(, undefined_handler) undefined_handlers[MAX_COPROCS];
   92 
   93 
   94 void *
   95 install_coproc_handler(int coproc, undef_handler_t handler)
   96 {
   97         struct undefined_handler *uh;
   98 
   99         KASSERT(coproc >= 0 && coproc < MAX_COPROCS, ("bad coproc"));
  100         KASSERT(handler != NULL, ("handler is NULL")); /* Used to be legal. */
  101 
  102         /* XXX: M_TEMP??? */
  103         uh = malloc(sizeof(*uh), M_TEMP, M_WAITOK);
  104         uh->uh_handler = handler;
  105         install_coproc_handler_static(coproc, uh);
  106         return uh;
  107 }
  108 
  109 void
  110 install_coproc_handler_static(int coproc, struct undefined_handler *uh)
  111 {
  112 
  113         LIST_INSERT_HEAD(&undefined_handlers[coproc], uh, uh_link);
  114 }
  115 
  116 void
  117 remove_coproc_handler(void *cookie)
  118 {
  119         struct undefined_handler *uh = cookie;
  120 
  121         LIST_REMOVE(uh, uh_link);
  122         free(uh, M_TEMP);
  123 }
  124 
  125 
  126 static int
  127 gdb_trapper(u_int addr, u_int insn, struct trapframe *frame, int code)
  128 {
  129         struct thread *td;
  130         ksiginfo_t ksi;
  131 
  132         td = (curthread == NULL) ? &thread0 : curthread;
  133 
  134         if (insn == GDB_BREAKPOINT || insn == GDB5_BREAKPOINT) {
  135                 if (code == FAULT_USER) {
  136                         ksiginfo_init_trap(&ksi);
  137                         ksi.ksi_signo = SIGTRAP;
  138                         ksi.ksi_code = TRAP_BRKPT;
  139                         ksi.ksi_addr = (u_int32_t *)addr;
  140                         trapsignal(td, &ksi);
  141                         return 0;
  142                 }
  143 #if 0
  144 #ifdef KGDB
  145                 return !kgdb_trap(T_BREAKPOINT, frame);
  146 #endif
  147 #endif
  148         }
  149         return 1;
  150 }
  151 
  152 static struct undefined_handler gdb_uh;
  153 
  154 void
  155 undefined_init()
  156 {
  157         int loop;
  158 
  159         /* Not actually necessary -- the initialiser is just NULL */
  160         for (loop = 0; loop < MAX_COPROCS; ++loop)
  161                 LIST_INIT(&undefined_handlers[loop]);
  162 
  163         /* Install handler for GDB breakpoints */
  164         gdb_uh.uh_handler = gdb_trapper;
  165         install_coproc_handler_static(0, &gdb_uh);
  166 }
  167 
  168 
  169 void
  170 undefinedinstruction(struct trapframe *frame)
  171 {
  172         struct thread *td;
  173         u_int fault_pc;
  174         int fault_instruction;
  175         int fault_code;
  176         int coprocessor;
  177         struct undefined_handler *uh;
  178 #ifdef VERBOSE_ARM32
  179         int s;
  180 #endif
  181         ksiginfo_t ksi;
  182 
  183         /* Enable interrupts if they were enabled before the exception. */
  184         if (__predict_true(frame->tf_spsr & PSR_I) == 0)
  185                 enable_interrupts(PSR_I);
  186         if (__predict_true(frame->tf_spsr & PSR_F) == 0)
  187                 enable_interrupts(PSR_F);
  188 
  189         PCPU_INC(cnt.v_trap);
  190 
  191         fault_pc = frame->tf_pc;
  192 
  193         /*
  194          * Get the current thread/proc structure or thread0/proc0 if there is
  195          * none.
  196          */
  197         td = curthread == NULL ? &thread0 : curthread;
  198 
  199         /*
  200          * Make sure the program counter is correctly aligned so we
  201          * don't take an alignment fault trying to read the opcode.
  202          */
  203         if (__predict_false((fault_pc & 3) != 0)) {
  204                 ksiginfo_init_trap(&ksi);
  205                 ksi.ksi_signo = SIGILL;
  206                 ksi.ksi_code = ILL_ILLADR;
  207                 ksi.ksi_addr = (u_int32_t *)(intptr_t) fault_pc;
  208                 trapsignal(td, &ksi);
  209                 userret(td, frame);
  210                 return;
  211         }
  212 
  213         /*
  214          * Should use fuword() here .. but in the interests of squeezing every
  215          * bit of speed we will just use ReadWord(). We know the instruction
  216          * can be read as was just executed so this will never fail unless the
  217          * kernel is screwed up in which case it does not really matter does
  218          * it ?
  219          */
  220 
  221         fault_instruction = *(u_int32_t *)fault_pc;
  222 
  223         /* Update vmmeter statistics */
  224 #if 0
  225         uvmexp.traps++;
  226 #endif
  227         /* Check for coprocessor instruction */
  228 
  229         /*
  230          * According to the datasheets you only need to look at bit 27 of the
  231          * instruction to tell the difference between and undefined
  232          * instruction and a coprocessor instruction following an undefined
  233          * instruction trap.
  234          */
  235 
  236         coprocessor = 0;
  237         if ((fault_instruction & (1 << 27)) != 0)
  238                 coprocessor = (fault_instruction >> 8) & 0x0f;
  239 #ifdef VFP
  240         else {          /* check for special instructions */
  241                 if (((fault_instruction & 0xfe000000) == 0xf2000000) ||
  242                     ((fault_instruction & 0xff100000) == 0xf4000000))
  243                         coprocessor = 10;       /* vfp / simd */
  244         }
  245 #endif  /* VFP */
  246 
  247         if ((frame->tf_spsr & PSR_MODE) == PSR_USR32_MODE) {
  248                 /*
  249                  * Modify the fault_code to reflect the USR/SVC state at
  250                  * time of fault.
  251                  */
  252                 fault_code = FAULT_USER;
  253                 td->td_frame = frame;
  254         } else
  255                 fault_code = 0;
  256 
  257         /* OK this is were we do something about the instruction. */
  258         LIST_FOREACH(uh, &undefined_handlers[coprocessor], uh_link)
  259             if (uh->uh_handler(fault_pc, fault_instruction, frame,
  260                                fault_code) == 0)
  261                     break;
  262 
  263         if (fault_code & FAULT_USER && fault_instruction == PTRACE_BREAKPOINT) {
  264                 PROC_LOCK(td->td_proc);
  265                 _PHOLD(td->td_proc);
  266                 ptrace_clear_single_step(td);
  267                 _PRELE(td->td_proc);
  268                 PROC_UNLOCK(td->td_proc);
  269                 return;
  270         }
  271 
  272         if (uh == NULL && (fault_code & FAULT_USER)) {
  273                 /* Fault has not been handled */
  274                 ksiginfo_init_trap(&ksi);
  275                 ksi.ksi_signo = SIGILL;
  276                 ksi.ksi_code = ILL_ILLOPC;
  277                 ksi.ksi_addr = (u_int32_t *)(intptr_t) fault_pc;
  278                 trapsignal(td, &ksi);
  279         }
  280 
  281         if ((fault_code & FAULT_USER) == 0) {
  282                 if (fault_instruction == KERNEL_BREAKPOINT) {
  283 #ifdef KDB
  284                         kdb_trap(T_BREAKPOINT, 0, frame);
  285 #else
  286                         printf("No debugger in kernel.\n");
  287 #endif
  288                         return;
  289                 } else
  290                         panic("Undefined instruction in kernel.\n");
  291         }
  292 
  293         userret(td, frame);
  294 }

Cache object: 334c4d79f249818b26829dc1c6b36024

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

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