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1 /***************************************************************************
2  *   Copyright (C) 2005 by Dominic Rath                                    *
3  *   Dominic.Rath@gmx.de                                                   *
4  *                                                                         *
5  *   Copyright (C) 2007,2008 Ã˜yvind 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  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
22  ***************************************************************************/
23 #ifdef HAVE_CONFIG_H
24 #include "config.h"
25 #endif
26
27 #include <helper/types.h>
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         {
49                 for (i = 0; i < cache->num_regs; i++)
50                 {
51                         if (strcmp(cache->reg_list[i].name, name) == 0)
52                                 return &(cache->reg_list[i]);
53                 }
54
55                 if (search_all)
56                         cache = cache->next;
57                 else
58                         break;
59         }
60
61         return NULL;
62 }
63
64 struct reg_cache** register_get_last_cache_p(struct reg_cache **first)
65 {
66         struct reg_cache **cache_p = first;
67
68         if (*cache_p)
69                 while (*cache_p)
70                         cache_p = &((*cache_p)->next);
71         else
72                 return first;
73
74         return cache_p;
75 }
76
77 /** Marks the contents of the register cache as invalid (and clean). */
78 void register_cache_invalidate(struct reg_cache *cache)
79 {
80         struct reg *reg = cache->reg_list;
81
82         for (unsigned n = cache->num_regs; n != 0; n--, reg++) {
83                 reg->valid = 0;
84                 reg->dirty = 0;
85         }
86 }
87
88 static int register_get_dummy_core_reg(struct reg *reg)
89 {
90         return ERROR_OK;
91 }
92
93 static int register_set_dummy_core_reg(struct reg *reg, uint8_t *buf)
94 {
95         reg->dirty = 1;
96         reg->valid = 1;
97
98         return ERROR_OK;
99 }
100
101 static const struct reg_arch_type dummy_type = {
102         .get = register_get_dummy_core_reg,
103         .set = register_set_dummy_core_reg,
104 };
105
106 void register_init_dummy(struct reg *reg)
107 {
108         reg->type = &dummy_type;
109 }