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/10.0/sys/arm/arm/undefined.c 254461 2013-08-17 18:51:38Z andrew $");
   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/asm.h>
   73 #include <machine/cpu.h>
   74 #include <machine/frame.h>
   75 #include <machine/undefined.h>
   76 #include <machine/trap.h>
   77 
   78 #include <machine/disassem.h>
   79 
   80 #ifdef DDB
   81 #include <ddb/db_output.h>
   82 #endif
   83 
   84 #ifdef KDB
   85 #include <machine/db_machdep.h>
   86 #endif
   87 
   88 static int gdb_trapper(u_int, u_int, struct trapframe *, int);
   89 
   90 LIST_HEAD(, undefined_handler) undefined_handlers[MAX_COPROCS];
   91 
   92 
   93 void *
   94 install_coproc_handler(int coproc, undef_handler_t handler)
   95 {
   96         struct undefined_handler *uh;
   97 
   98         KASSERT(coproc >= 0 && coproc < MAX_COPROCS, ("bad coproc"));
   99         KASSERT(handler != NULL, ("handler is NULL")); /* Used to be legal. */
  100 
  101         /* XXX: M_TEMP??? */
  102         uh = malloc(sizeof(*uh), M_TEMP, M_WAITOK);
  103         uh->uh_handler = handler;
  104         install_coproc_handler_static(coproc, uh);
  105         return uh;
  106 }
  107 
  108 void
  109 install_coproc_handler_static(int coproc, struct undefined_handler *uh)
  110 {
  111 
  112         LIST_INSERT_HEAD(&undefined_handlers[coproc], uh, uh_link);
  113 }
  114 
  115 void
  116 remove_coproc_handler(void *cookie)
  117 {
  118         struct undefined_handler *uh = cookie;
  119 
  120         LIST_REMOVE(uh, uh_link);
  121         free(uh, M_TEMP);
  122 }
  123 
  124 
  125 static int
  126 gdb_trapper(u_int addr, u_int insn, struct trapframe *frame, int code)
  127 {
  128         struct thread *td;
  129         ksiginfo_t ksi;
  130 
  131         td = (curthread == NULL) ? &thread0 : curthread;
  132 
  133         if (insn == GDB_BREAKPOINT || insn == GDB5_BREAKPOINT) {
  134                 if (code == FAULT_USER) {
  135                         ksiginfo_init_trap(&ksi);
  136                         ksi.ksi_signo = SIGTRAP;
  137                         ksi.ksi_code = TRAP_BRKPT;
  138                         ksi.ksi_addr = (u_int32_t *)addr;
  139                         trapsignal(td, &ksi);
  140                         return 0;
  141                 }
  142 #if 0
  143 #ifdef KGDB
  144                 return !kgdb_trap(T_BREAKPOINT, frame);
  145 #endif
  146 #endif
  147         }
  148         return 1;
  149 }
  150 
  151 static struct undefined_handler gdb_uh;
  152 
  153 void
  154 undefined_init()
  155 {
  156         int loop;
  157 
  158         /* Not actually necessary -- the initialiser is just NULL */
  159         for (loop = 0; loop < MAX_COPROCS; ++loop)
  160                 LIST_INIT(&undefined_handlers[loop]);
  161 
  162         /* Install handler for GDB breakpoints */
  163         gdb_uh.uh_handler = gdb_trapper;
  164         install_coproc_handler_static(0, &gdb_uh);
  165 }
  166 
  167 
  168 void
  169 undefinedinstruction(trapframe_t *frame)
  170 {
  171         struct thread *td;
  172         u_int fault_pc;
  173         int fault_instruction;
  174         int fault_code;
  175         int coprocessor;
  176         struct undefined_handler *uh;
  177 #ifdef VERBOSE_ARM32
  178         int s;
  179 #endif
  180         ksiginfo_t ksi;
  181 
  182         /* Enable interrupts if they were enabled before the exception. */
  183         if (!(frame->tf_spsr & I32_bit))
  184                 enable_interrupts(I32_bit|F32_bit);
  185 
  186         frame->tf_pc -= INSN_SIZE;
  187         PCPU_INC(cnt.v_trap);
  188 
  189         fault_pc = frame->tf_pc;
  190 
  191         /*
  192          * Get the current thread/proc structure or thread0/proc0 if there is
  193          * none.
  194          */
  195         td = curthread == NULL ? &thread0 : curthread;
  196 
  197         /*
  198          * Make sure the program counter is correctly aligned so we
  199          * don't take an alignment fault trying to read the opcode.
  200          */
  201         if (__predict_false((fault_pc & 3) != 0)) {
  202                 ksiginfo_init_trap(&ksi);
  203                 ksi.ksi_signo = SIGILL;
  204                 ksi.ksi_code = ILL_ILLADR;
  205                 ksi.ksi_addr = (u_int32_t *)(intptr_t) fault_pc;
  206                 trapsignal(td, &ksi);
  207                 userret(td, frame);
  208                 return;
  209         }
  210 
  211         /*
  212          * Should use fuword() here .. but in the interests of squeezing every
  213          * bit of speed we will just use ReadWord(). We know the instruction
  214          * can be read as was just executed so this will never fail unless the
  215          * kernel is screwed up in which case it does not really matter does
  216          * it ?
  217          */
  218 
  219         fault_instruction = *(u_int32_t *)fault_pc;
  220 
  221         /* Update vmmeter statistics */
  222 #if 0
  223         uvmexp.traps++;
  224 #endif
  225         /* Check for coprocessor instruction */
  226 
  227         /*
  228          * According to the datasheets you only need to look at bit 27 of the
  229          * instruction to tell the difference between and undefined
  230          * instruction and a coprocessor instruction following an undefined
  231          * instruction trap.
  232          */
  233 
  234         coprocessor = 0;
  235         if ((fault_instruction & (1 << 27)) != 0)
  236                 coprocessor = (fault_instruction >> 8) & 0x0f;
  237 #ifdef VFP
  238         else {          /* check for special instructions */
  239                 if (((fault_instruction & 0xfe000000) == 0xf2000000) ||
  240                     ((fault_instruction & 0xff100000) == 0xf4000000))
  241                         coprocessor = 10;       /* vfp / simd */
  242         }
  243 #endif  /* VFP */
  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         userret(td, frame);
  292 }

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

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