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, see <http://www.gnu.org/licenses/>. *
  20  ***************************************************************************/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include "register.h"
  27 #include <helper/log.h>
  28
  29 /**
  30  * @file
  31  * Holds utilities to work with register caches.
  32  *
  33  * OpenOCD uses machine registers internally, and exposes them by name
  34  * to Tcl scripts.  Sets of related registers are grouped into caches.
  35  * For example, a CPU core will expose a set of registers, and there
  36  * may be separate registers associated with debug or trace modules.
  37  */
  38
  39 struct reg *register_get_by_name(struct reg_cache *first,
  40                 const char *name, bool search_all)
  41 {
  42         unsigned i;
  43         struct reg_cache *cache = first;
  44
  45         while (cache) {
  46                 for (i = 0; i < cache->num_regs; i++) {
  47                         if (strcmp(cache->reg_list[i].name, name) == 0)
  48                                 return &(cache->reg_list[i]);
  49                 }
  50
  51                 if (search_all)
  52                         cache = cache->next;
  53                 else
  54                         break;
  55         }
  56
  57         return NULL;
  58 }
  59
  60 struct reg_cache **register_get_last_cache_p(struct reg_cache **first)
  61 {
  62         struct reg_cache **cache_p = first;
  63
  64         if (*cache_p)
  65                 while (*cache_p)
  66                         cache_p = &((*cache_p)->next);
  67         else
  68                 return first;
  69
  70         return cache_p;
  71 }
  72
  73 void register_unlink_cache(struct reg_cache **cache_p, const struct reg_cache *cache)
  74 {
  75         while (*cache_p && *cache_p != cache)
  76                 cache_p = &((*cache_p)->next);
  77         if (*cache_p)
  78                 *cache_p = cache->next;
  79 }
  80
  81 /** Marks the contents of the register cache as invalid (and clean). */
  82 void register_cache_invalidate(struct reg_cache *cache)
  83 {
  84         struct reg *reg = cache->reg_list;
  85
  86         for (unsigned n = cache->num_regs; n != 0; n--, reg++) {
  87                 reg->valid = 0;
  88                 reg->dirty = 0;
  89         }
  90 }
  91
  92 static int register_get_dummy_core_reg(struct reg *reg)
  93 {
  94         return ERROR_OK;
  95 }
  96
  97 static int register_set_dummy_core_reg(struct reg *reg, uint8_t *buf)
  98 {
  99         reg->dirty = 1;
 100         reg->valid = 1;
 101
 102         return ERROR_OK;
 103 }
 104
 105 static const struct reg_arch_type dummy_type = {
 106         .get = register_get_dummy_core_reg,
 107         .set = register_set_dummy_core_reg,
 108 };
 109
 110 void register_init_dummy(struct reg *reg)
 111 {
 112         reg->type = &dummy_type;
 113 }