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win32-arm-low.c
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1 /* Copyright (C) 2007-2018 Free Software Foundation, Inc.
2
3 This file is part of GDB.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17
18 #include "server.h"
19 #include "win32-low.h"
20
21 #ifndef CONTEXT_FLOATING_POINT
22 #define CONTEXT_FLOATING_POINT 0
23 #endif
24
25 /* Defined in auto-generated file reg-arm.c. */
26 void init_registers_arm (void);
27 extern const struct target_desc *tdesc_arm;
28
29 static void
30 arm_get_thread_context (win32_thread_info *th)
31 {
32 th->context.ContextFlags = \
33 CONTEXT_FULL | \
34 CONTEXT_FLOATING_POINT;
35
36 GetThreadContext (th->h, &th->context);
37 }
38
39 #define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
40 static const int mappings[] = {
41 context_offset (R0),
42 context_offset (R1),
43 context_offset (R2),
44 context_offset (R3),
45 context_offset (R4),
46 context_offset (R5),
47 context_offset (R6),
48 context_offset (R7),
49 context_offset (R8),
50 context_offset (R9),
51 context_offset (R10),
52 context_offset (R11),
53 context_offset (R12),
54 context_offset (Sp),
55 context_offset (Lr),
56 context_offset (Pc),
57 -1, /* f0 */
58 -1, /* f1 */
59 -1, /* f2 */
60 -1, /* f3 */
61 -1, /* f4 */
62 -1, /* f5 */
63 -1, /* f6 */
64 -1, /* f7 */
65 -1, /* fps */
66 context_offset (Psr),
67 };
68 #undef context_offset
69
70 /* Return a pointer into a CONTEXT field indexed by gdb register number.
71 Return a pointer to an dummy register holding zero if there is no
72 corresponding CONTEXT field for the given register number. */
73 static char *
74 regptr (CONTEXT* c, int r)
75 {
76 if (mappings[r] < 0)
77 {
78 static ULONG zero;
79 /* Always force value to zero, in case the user tried to write
80 to this register before. */
81 zero = 0;
82 return (char *) &zero;
83 }
84 else
85 return (char *) c + mappings[r];
86 }
87
88 /* Fetch register from gdbserver regcache data. */
89 static void
90 arm_fetch_inferior_register (struct regcache *regcache,
91 win32_thread_info *th, int r)
92 {
93 char *context_offset = regptr (&th->context, r);
94 supply_register (regcache, r, context_offset);
95 }
96
97 /* Store a new register value into the thread context of TH. */
98 static void
99 arm_store_inferior_register (struct regcache *regcache,
100 win32_thread_info *th, int r)
101 {
102 collect_register (regcache, r, regptr (&th->context, r));
103 }
104
105 static void
106 arm_arch_setup (void)
107 {
108 init_registers_arm ();
109 win32_tdesc = tdesc_arm;
110 }
111
112 /* Correct in either endianness. We do not support Thumb yet. */
113 static const unsigned long arm_wince_breakpoint = 0xe6000010;
114 #define arm_wince_breakpoint_len 4
115
116 struct win32_target_ops the_low_target = {
117 arm_arch_setup,
118 sizeof (mappings) / sizeof (mappings[0]),
119 NULL, /* initial_stuff */
120 arm_get_thread_context,
121 NULL, /* prepare_to_resume */
122 NULL, /* thread_added */
123 arm_fetch_inferior_register,
124 arm_store_inferior_register,
125 NULL, /* single_step */
126 (const unsigned char *) &arm_wince_breakpoint,
127 arm_wince_breakpoint_len,
128 /* Watchpoint related functions. See target.h for comments. */
129 NULL, /* supports_z_point_type */
130 NULL, /* insert_point */
131 NULL, /* remove_point */
132 NULL, /* stopped_by_watchpoint */
133 NULL /* stopped_data_address */
134 };
collect_register
void collect_register(struct regcache *regcache, int n, void *buf)
Definition: regcache.c:402
arm_wince_breakpoint_len
#define arm_wince_breakpoint_len
Definition: win32-arm-low.c:114
arm_fetch_inferior_register
static void arm_fetch_inferior_register(struct regcache *regcache, win32_thread_info *th, int r)
Definition: win32-arm-low.c:90
arm_wince_breakpoint
static const unsigned long arm_wince_breakpoint
Definition: win32-arm-low.c:113
regptr
static char * regptr(CONTEXT *c, int r)
Definition: win32-arm-low.c:74
regcache
Definition: regcache.h:31
win32-low.h
mappings
static const int mappings[]
Definition: win32-arm-low.c:40
win32_target_ops
Definition: win32-low.h:56
context_offset
#define context_offset(x)
Definition: win32-arm-low.c:39
arm_get_thread_context
static void arm_get_thread_context(win32_thread_info *th)
Definition: win32-arm-low.c:30
server.h
the_low_target
struct win32_target_ops the_low_target
Definition: win32-arm-low.c:116
arm_arch_setup
static void arm_arch_setup(void)
Definition: win32-arm-low.c:106
arm_store_inferior_register
static void arm_store_inferior_register(struct regcache *regcache, win32_thread_info *th, int r)
Definition: win32-arm-low.c:99
target_desc
Definition: tdesc.h:33
init_registers_arm
void init_registers_arm(void)
win32_tdesc
const struct target_desc * win32_tdesc
Definition: win32-low.c:95
win32_thread_info::context
CONTEXT context
Definition: win32-low.h:49
win32_thread_info::h
HANDLE h
Definition: win32-low.h:35
tdesc_arm
const struct target_desc * tdesc_arm
supply_register
void supply_register(struct regcache *regcache, int n, const void *buf)
Definition: regcache.c:318
win32_thread_info
Definition: win32-low.h:29