sys/arm64/include/csan.h

   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
  32 #include <machine/cpufunc.h>
  33 #include <machine/stack.h>
  34 #include <machine/vmparam.h>
  35
  36 static inline bool
  37 kcsan_md_unsupported(vm_offset_t addr)
  38 {
  39         return false;
  40 }
  41
  42 static inline bool
  43 kcsan_md_is_avail(void)
  44 {
  45         return true;
  46 }
  47
  48 static inline void
  49 kcsan_md_disable_intrs(uint64_t *state)
  50 {
  51
  52         *state = intr_disable();
  53 }
  54
  55 static inline void
  56 kcsan_md_enable_intrs(uint64_t *state)
  57 {
  58
  59         intr_restore(*state);
  60 }
  61
  62 static inline void
  63 kcsan_md_delay(uint64_t us)
  64 {
  65         DELAY(us);
  66 }
  67
  68 static void
  69 kcsan_md_unwind(void)
  70 {
  71 #ifdef DDB
  72         c_db_sym_t sym;
  73         db_expr_t offset;
  74         const char *symname;
  75 #endif
  76         struct unwind_state frame;
  77         int nsym;
  78
  79         frame.fp = (uintptr_t)__builtin_frame_address(0);
  80         frame.pc = (uintptr_t)kcsan_md_unwind;
  81         nsym = 0;
  82
  83         while (1) {
  84                 if (!unwind_frame(curthread, &frame))
  85                         break;
  86                 if (!INKERNEL((vm_offset_t)frame.pc))
  87                         break;
  88
  89 #ifdef DDB
  90                 sym = db_search_symbol((vm_offset_t)frame.pc, DB_STGY_PROC,
  91                     &offset);
  92                 db_symbol_values(sym, &symname, NULL);
  93                 printf("#%d %p in %s+%#lx\n", nsym, (void *)frame.pc,
  94                     symname, offset);
  95 #else
  96                 printf("#%d %p\n", nsym, (void *)frame.pc);
  97 #endif
  98                 nsym++;
  99
 100                 if (nsym >= 15) {
 101                         break;
 102                 }
 103         }
 104 }