src/target/register.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program; if not, write to the                         *
  20  *   Free Software Foundation, Inc.,                                       *
  21  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
  22  ***************************************************************************/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include "register.h"
  29 #include <helper/log.h>
  30
  31 /**
  32  * @file
  33  * Holds utilities to work with register caches.
  34  *
  35  * OpenOCD uses machine registers internally, and exposes them by name
  36  * to Tcl scripts.  Sets of related registers are grouped into caches.
  37  * For example, a CPU core will expose a set of registers, and there
  38  * may be separate registers associated with debug or trace modules.
  39  */
  40
  41 struct reg *register_get_by_name(struct reg_cache *first,
  42                 const char *name, bool search_all)
  43 {
  44         unsigned i;
  45         struct reg_cache *cache = first;
  46
  47         while (cache) {
  48                 for (i = 0; i < cache->num_regs; i++) {
  49                         if (strcmp(cache->reg_list[i].name, name) == 0)
  50                                 return &(cache->reg_list[i]);
  51                 }
  52
  53                 if (search_all)
  54                         cache = cache->next;
  55                 else
  56                         break;
  57         }
  58
  59         return NULL;
  60 }
  61
  62 struct reg_cache **register_get_last_cache_p(struct reg_cache **first)
  63 {
  64         struct reg_cache **cache_p = first;
  65
  66         if (*cache_p)
  67                 while (*cache_p)
  68                         cache_p = &((*cache_p)->next);
  69         else
  70                 return first;
  71
  72         return cache_p;
  73 }
  74
  75 /** Marks the contents of the register cache as invalid (and clean). */
  76 void register_cache_invalidate(struct reg_cache *cache)
  77 {
  78         struct reg *reg = cache->reg_list;
  79
  80         for (unsigned n = cache->num_regs; n != 0; n--, reg++) {
  81                 reg->valid = 0;
  82                 reg->dirty = 0;
  83         }
  84 }
  85
  86 static int register_get_dummy_core_reg(struct reg *reg)
  87 {
  88         return ERROR_OK;
  89 }
  90
  91 static int register_set_dummy_core_reg(struct reg *reg, uint8_t *buf)
  92 {
  93         reg->dirty = 1;
  94         reg->valid = 1;
  95
  96         return ERROR_OK;
  97 }
  98
  99 static const struct reg_arch_type dummy_type = {
 100         .get = register_get_dummy_core_reg,
 101         .set = register_set_dummy_core_reg,
 102 };
 103
 104 void register_init_dummy(struct reg *reg)
 105 {
 106         reg->type = &dummy_type;
 107 }