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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/* Target-dependent code for Windows CE running on ARM processors,
for GDB.
Copyright (C) 2007-2015 Free Software Foundation, Inc.
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 3 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, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "osabi.h"
#include "gdbcore.h"
#include "target.h"
#include "frame.h"
#include "arm-tdep.h"
#include "windows-tdep.h"
static const gdb_byte arm_wince_le_breakpoint[] = { 0x10, 0x00, 0x00, 0xe6 };
static const gdb_byte arm_wince_thumb_le_breakpoint[] = { 0xfe, 0xdf };
/* Description of the longjmp buffer. */
#define ARM_WINCE_JB_ELEMENT_SIZE INT_REGISTER_SIZE
#define ARM_WINCE_JB_PC 10
static CORE_ADDR
arm_pe_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
ULONGEST indirect;
struct bound_minimal_symbol indsym;
const char *symname;
CORE_ADDR next_pc;
/* The format of an ARM DLL trampoline is:
ldr ip, [pc]
ldr pc, [ip]
.dw __imp_<func>
*/
if (pc == 0
|| read_memory_unsigned_integer (pc + 0, 4, byte_order) != 0xe59fc000
|| read_memory_unsigned_integer (pc + 4, 4, byte_order) != 0xe59cf000)
return 0;
indirect = read_memory_unsigned_integer (pc + 8, 4, byte_order);
if (indirect == 0)
return 0;
indsym = lookup_minimal_symbol_by_pc (indirect);
if (indsym.minsym == NULL)
return 0;
symname = MSYMBOL_LINKAGE_NAME (indsym.minsym);
if (symname == NULL || strncmp (symname, "__imp_", 6) != 0)
return 0;
next_pc = read_memory_unsigned_integer (indirect, 4, byte_order);
if (next_pc != 0)
return next_pc;
/* Check with the default arm gdbarch_skip_trampoline. */
return arm_skip_stub (frame, pc);
}
/* GCC emits a call to __gccmain in the prologue of main.
The function below examines the code pointed at by PC and checks to
see if it corresponds to a call to __gccmain. If so, it returns
the address of the instruction following that call. Otherwise, it
simply returns PC. */
static CORE_ADDR
arm_wince_skip_main_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
ULONGEST this_instr;
this_instr = read_memory_unsigned_integer (pc, 4, byte_order);
/* bl offset <__gccmain> */
if ((this_instr & 0xfff00000) == 0xeb000000)
{
#define sign_extend(V, N) \
(((long) (V) ^ (1L << ((N) - 1))) - (1L << ((N) - 1)))
long offset = sign_extend (this_instr & 0x000fffff, 23) << 2;
CORE_ADDR call_dest = (pc + 8 + offset) & 0xffffffffU;
struct bound_minimal_symbol s = lookup_minimal_symbol_by_pc (call_dest);
if (s.minsym != NULL
&& MSYMBOL_LINKAGE_NAME (s.minsym) != NULL
&& strcmp (MSYMBOL_LINKAGE_NAME (s.minsym), "__gccmain") == 0)
pc += 4;
}
return pc;
}
static void
arm_wince_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
windows_init_abi (info, gdbarch);
tdep->arm_breakpoint = arm_wince_le_breakpoint;
tdep->arm_breakpoint_size = sizeof (arm_wince_le_breakpoint);
tdep->thumb_breakpoint = arm_wince_thumb_le_breakpoint;
tdep->thumb_breakpoint_size = sizeof (arm_wince_thumb_le_breakpoint);
tdep->struct_return = pcc_struct_return;
tdep->fp_model = ARM_FLOAT_SOFT_VFP;
tdep->jb_pc = ARM_WINCE_JB_PC;
tdep->jb_elt_size = ARM_WINCE_JB_ELEMENT_SIZE;
/* On ARM WinCE char defaults to signed. */
set_gdbarch_char_signed (gdbarch, 1);
/* Shared library handling. */
set_gdbarch_skip_trampoline_code (gdbarch, arm_pe_skip_trampoline_code);
/* Single stepping. */
set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
/* Skip call to __gccmain that gcc places in main. */
set_gdbarch_skip_main_prologue (gdbarch, arm_wince_skip_main_prologue);
}
static enum gdb_osabi
arm_wince_osabi_sniffer (bfd *abfd)
{
const char *target_name = bfd_get_target (abfd);
if (strcmp (target_name, "pei-arm-wince-little") == 0)
return GDB_OSABI_WINCE;
return GDB_OSABI_UNKNOWN;
}
/* Provide a prototype to silence -Wmissing-prototypes. */
void _initialize_arm_wince_tdep (void);
void
_initialize_arm_wince_tdep (void)
{
gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_coff_flavour,
arm_wince_osabi_sniffer);
gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_WINCE,
arm_wince_init_abi);
}
|
