Commit | Line | Data |
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68070c10 PA |
1 | /* Target-dependent code for Windows CE running on ARM processors, |
2 | for GDB. | |
3 | ||
ecd75fc8 | 4 | Copyright (C) 2007-2014 Free Software Foundation, Inc. |
68070c10 PA |
5 | |
6 | This file is part of GDB. | |
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 | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
68070c10 PA |
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 | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
68070c10 PA |
20 | |
21 | #include "defs.h" | |
22 | #include "osabi.h" | |
6dc13412 | 23 | #include "gdbcore.h" |
68070c10 | 24 | #include "target.h" |
e17a4113 | 25 | #include "frame.h" |
68070c10 | 26 | |
68070c10 | 27 | #include "arm-tdep.h" |
29f9ebfa | 28 | #include "windows-tdep.h" |
68070c10 | 29 | |
948f8e3d PA |
30 | static const gdb_byte arm_wince_le_breakpoint[] = { 0x10, 0x00, 0x00, 0xe6 }; |
31 | static const gdb_byte arm_wince_thumb_le_breakpoint[] = { 0xfe, 0xdf }; | |
68070c10 PA |
32 | |
33 | /* Description of the longjmp buffer. */ | |
34 | #define ARM_WINCE_JB_ELEMENT_SIZE INT_REGISTER_SIZE | |
8ad7c2b9 | 35 | #define ARM_WINCE_JB_PC 10 |
68070c10 | 36 | |
6dc13412 PA |
37 | static CORE_ADDR |
38 | arm_pe_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) | |
39 | { | |
e17a4113 UW |
40 | struct gdbarch *gdbarch = get_frame_arch (frame); |
41 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
6dc13412 | 42 | ULONGEST indirect; |
7cbd4a93 | 43 | struct bound_minimal_symbol indsym; |
0d5cff50 | 44 | const char *symname; |
6dc13412 PA |
45 | CORE_ADDR next_pc; |
46 | ||
47 | /* The format of an ARM DLL trampoline is: | |
48 | ldr ip, [pc] | |
49 | ldr pc, [ip] | |
50 | .dw __imp_<func> */ | |
51 | ||
52 | if (pc == 0 | |
e17a4113 UW |
53 | || read_memory_unsigned_integer (pc + 0, 4, byte_order) != 0xe59fc000 |
54 | || read_memory_unsigned_integer (pc + 4, 4, byte_order) != 0xe59cf000) | |
6dc13412 PA |
55 | return 0; |
56 | ||
e17a4113 | 57 | indirect = read_memory_unsigned_integer (pc + 8, 4, byte_order); |
6dc13412 PA |
58 | if (indirect == 0) |
59 | return 0; | |
60 | ||
61 | indsym = lookup_minimal_symbol_by_pc (indirect); | |
7cbd4a93 | 62 | if (indsym.minsym == NULL) |
6dc13412 PA |
63 | return 0; |
64 | ||
efd66ac6 | 65 | symname = MSYMBOL_LINKAGE_NAME (indsym.minsym); |
6dc13412 PA |
66 | if (symname == NULL || strncmp (symname, "__imp_", 6) != 0) |
67 | return 0; | |
68 | ||
e17a4113 | 69 | next_pc = read_memory_unsigned_integer (indirect, 4, byte_order); |
6dc13412 PA |
70 | if (next_pc != 0) |
71 | return next_pc; | |
72 | ||
73 | /* Check with the default arm gdbarch_skip_trampoline. */ | |
74 | return arm_skip_stub (frame, pc); | |
75 | } | |
76 | ||
d7117c03 PA |
77 | /* GCC emits a call to __gccmain in the prologue of main. |
78 | ||
79 | The function below examines the code pointed at by PC and checks to | |
80 | see if it corresponds to a call to __gccmain. If so, it returns | |
81 | the address of the instruction following that call. Otherwise, it | |
82 | simply returns PC. */ | |
83 | ||
693be288 | 84 | static CORE_ADDR |
d7117c03 PA |
85 | arm_wince_skip_main_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
86 | { | |
87 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
88 | ULONGEST this_instr; | |
89 | ||
90 | this_instr = read_memory_unsigned_integer (pc, 4, byte_order); | |
91 | ||
92 | /* bl offset <__gccmain> */ | |
93 | if ((this_instr & 0xfff00000) == 0xeb000000) | |
94 | { | |
95 | #define sign_extend(V, N) \ | |
96 | (((long) (V) ^ (1L << ((N) - 1))) - (1L << ((N) - 1))) | |
97 | ||
98 | long offset = sign_extend (this_instr & 0x000fffff, 23) << 2; | |
99 | CORE_ADDR call_dest = (pc + 8 + offset) & 0xffffffffU; | |
7cbd4a93 | 100 | struct bound_minimal_symbol s = lookup_minimal_symbol_by_pc (call_dest); |
d7117c03 | 101 | |
7cbd4a93 | 102 | if (s.minsym != NULL |
efd66ac6 TT |
103 | && MSYMBOL_LINKAGE_NAME (s.minsym) != NULL |
104 | && strcmp (MSYMBOL_LINKAGE_NAME (s.minsym), "__gccmain") == 0) | |
d7117c03 PA |
105 | pc += 4; |
106 | } | |
107 | ||
108 | return pc; | |
109 | } | |
110 | ||
68070c10 PA |
111 | static void |
112 | arm_wince_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
113 | { | |
114 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
115 | ||
29f9ebfa YQ |
116 | windows_init_abi (info, gdbarch); |
117 | ||
68070c10 PA |
118 | tdep->arm_breakpoint = arm_wince_le_breakpoint; |
119 | tdep->arm_breakpoint_size = sizeof (arm_wince_le_breakpoint); | |
190dce09 UW |
120 | tdep->thumb_breakpoint = arm_wince_thumb_le_breakpoint; |
121 | tdep->thumb_breakpoint_size = sizeof (arm_wince_thumb_le_breakpoint); | |
68070c10 PA |
122 | tdep->struct_return = pcc_struct_return; |
123 | ||
124 | tdep->fp_model = ARM_FLOAT_SOFT_VFP; | |
125 | ||
126 | tdep->jb_pc = ARM_WINCE_JB_PC; | |
127 | tdep->jb_elt_size = ARM_WINCE_JB_ELEMENT_SIZE; | |
128 | ||
129 | /* On ARM WinCE char defaults to signed. */ | |
130 | set_gdbarch_char_signed (gdbarch, 1); | |
131 | ||
68070c10 | 132 | /* Shared library handling. */ |
6dc13412 | 133 | set_gdbarch_skip_trampoline_code (gdbarch, arm_pe_skip_trampoline_code); |
190dce09 UW |
134 | |
135 | /* Single stepping. */ | |
136 | set_gdbarch_software_single_step (gdbarch, arm_software_single_step); | |
d7117c03 PA |
137 | |
138 | /* Skip call to __gccmain that gcc places in main. */ | |
139 | set_gdbarch_skip_main_prologue (gdbarch, arm_wince_skip_main_prologue); | |
68070c10 PA |
140 | } |
141 | ||
142 | static enum gdb_osabi | |
143 | arm_wince_osabi_sniffer (bfd *abfd) | |
144 | { | |
145 | const char *target_name = bfd_get_target (abfd); | |
146 | ||
147 | if (strcmp (target_name, "pei-arm-wince-little") == 0) | |
148 | return GDB_OSABI_WINCE; | |
149 | ||
150 | return GDB_OSABI_UNKNOWN; | |
151 | } | |
152 | ||
153 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
154 | void _initialize_arm_wince_tdep (void); | |
155 | ||
156 | void | |
157 | _initialize_arm_wince_tdep (void) | |
158 | { | |
159 | gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_coff_flavour, | |
160 | arm_wince_osabi_sniffer); | |
161 | ||
162 | gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_WINCE, | |
163 | arm_wince_init_abi); | |
164 | } |