csan.h

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    1 /*      $NetBSD: csan.h,v 1.2 2019/11/06 06:57:22 maxv Exp $    */
    2 
    3 /*
    4  * Copyright (c) 2019 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Maxime Villard.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   29  * POSSIBILITY OF SUCH DAMAGE.
   30  *
   31  * $FreeBSD$
   32  */
   33 
   34 #include <machine/cpufunc.h>
   35 #include <machine/stack.h>
   36 #include <machine/vmparam.h>
   37 
   38 static inline bool
   39 kcsan_md_unsupported(vm_offset_t addr)
   40 {
   41         return false;
   42 }
   43 
   44 static inline bool
   45 kcsan_md_is_avail(void)
   46 {
   47         return true;
   48 }
   49 
   50 static inline void
   51 kcsan_md_disable_intrs(uint64_t *state)
   52 {
   53 
   54         *state = intr_disable();
   55 }
   56 
   57 static inline void
   58 kcsan_md_enable_intrs(uint64_t *state)
   59 {
   60 
   61         intr_restore(*state);
   62 }
   63 
   64 static inline void
   65 kcsan_md_delay(uint64_t us)
   66 {
   67         DELAY(us);
   68 }
   69 
   70 static void
   71 kcsan_md_unwind(void)
   72 {
   73 #ifdef DDB
   74         c_db_sym_t sym;
   75         db_expr_t offset;
   76         const char *symname;
   77 #endif
   78         struct unwind_state frame;
   79         int nsym;
   80 
   81         frame.fp = (uintptr_t)__builtin_frame_address(0);
   82         frame.pc = (uintptr_t)kcsan_md_unwind;
   83         nsym = 0;
   84 
   85         while (1) {
   86                 if (!unwind_frame(curthread, &frame))
   87                         break;
   88                 if (!INKERNEL((vm_offset_t)frame.pc))
   89                         break;
   90 
   91 #ifdef DDB
   92                 sym = db_search_symbol((vm_offset_t)frame.pc, DB_STGY_PROC,
   93                     &offset);
   94                 db_symbol_values(sym, &symname, NULL);
   95                 printf("#%d %p in %s+%#lx\n", nsym, (void *)frame.pc,
   96                     symname, offset);
   97 #else
   98                 printf("#%d %p\n", nsym, (void *)frame.pc);
   99 #endif
  100                 nsym++;
  101 
  102                 if (nsym >= 15) {
  103                         break;
  104                 }
  105         }
  106 }

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FreeBSD/Linux Kernel Cross Reference sys/arm64/include/csan.h

FreeBSD/Linux Kernel Cross Reference
sys/arm64/include/csan.h