1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/* Target description support for GDB.
Copyright (C) 2006
Free Software Foundation, Inc.
Contributed by CodeSourcery.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#include "defs.h"
#include "arch-utils.h"
#include "target.h"
#include "target-descriptions.h"
#include "gdb_assert.h"
/* Types. */
struct target_desc
{
};
/* Global state. These variables are associated with the current
target; if GDB adds support for multiple simultaneous targets, then
these variables should become target-specific data. */
/* A flag indicating that a description has already been fetched from
the current target, so it should not be queried again. */
static int target_desc_fetched;
/* The description fetched from the current target, or NULL if the
current target did not supply any description. Only valid when
target_desc_fetched is set. Only the description initialization
code should access this; normally, the description should be
accessed through the gdbarch object. */
static const struct target_desc *current_target_desc;
/* Fetch the current target's description, and switch the current
architecture to one which incorporates that description. */
void
target_find_description (void)
{
/* If we've already fetched a description from the target, don't do
it again. This allows a target to fetch the description early,
during its to_open or to_create_inferior, if it needs extra
information about the target to initialize. */
if (target_desc_fetched)
return;
/* The current architecture should not have any target description
specified. It should have been cleared, e.g. when we
disconnected from the previous target. */
gdb_assert (gdbarch_target_desc (current_gdbarch) == NULL);
current_target_desc = target_read_description (¤t_target);
/* If a non-NULL description was returned, then update the current
architecture. */
if (current_target_desc)
{
struct gdbarch_info info;
gdbarch_info_init (&info);
info.target_desc = current_target_desc;
if (!gdbarch_update_p (info))
warning (_("Could not use target-supplied description"));
}
/* Now that we know this description is usable, record that we
fetched it. */
target_desc_fetched = 1;
}
/* Discard any description fetched from the current target, and switch
the current architecture to one with no target description. */
void
target_clear_description (void)
{
struct gdbarch_info info;
if (!target_desc_fetched)
return;
target_desc_fetched = 0;
current_target_desc = NULL;
gdbarch_info_init (&info);
if (!gdbarch_update_p (info))
internal_error (__FILE__, __LINE__,
_("Could not remove target-supplied description"));
}
/* Return the global current target description. This should only be
used by gdbarch initialization code; most access should be through
an existing gdbarch. */
const struct target_desc *
target_current_description (void)
{
if (target_desc_fetched)
return current_target_desc;
return NULL;
}
/* Methods for constructing a target description. */
struct target_desc *
allocate_target_description (void)
{
return XZALLOC (struct target_desc);
}
|
