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68070c10 PA |
1 | /* Target-dependent code for Windows CE running on ARM processors, |
2 | for GDB. | |
3 | ||
4 | Copyright (C) 2007 Free Software Foundation, Inc. | |
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 PA |
24 | #include "target.h" |
25 | ||
26 | #include "gdb_string.h" | |
27 | ||
28 | #include "arm-tdep.h" | |
29 | ||
30 | static const char arm_wince_le_breakpoint[] = { 0x10, 0x00, 0x00, 0xe6 }; | |
190dce09 | 31 | static const char 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 | { | |
40 | ULONGEST indirect; | |
41 | struct minimal_symbol *indsym; | |
42 | char *symname; | |
43 | CORE_ADDR next_pc; | |
44 | ||
45 | /* The format of an ARM DLL trampoline is: | |
46 | ldr ip, [pc] | |
47 | ldr pc, [ip] | |
48 | .dw __imp_<func> */ | |
49 | ||
50 | if (pc == 0 | |
51 | || read_memory_unsigned_integer (pc + 0, 4) != 0xe59fc000 | |
52 | || read_memory_unsigned_integer (pc + 4, 4) != 0xe59cf000) | |
53 | return 0; | |
54 | ||
55 | indirect = read_memory_unsigned_integer (pc + 8, 4); | |
56 | if (indirect == 0) | |
57 | return 0; | |
58 | ||
59 | indsym = lookup_minimal_symbol_by_pc (indirect); | |
60 | if (indsym == NULL) | |
61 | return 0; | |
62 | ||
63 | symname = SYMBOL_LINKAGE_NAME (indsym); | |
64 | if (symname == NULL || strncmp (symname, "__imp_", 6) != 0) | |
65 | return 0; | |
66 | ||
67 | next_pc = read_memory_unsigned_integer (indirect, 4); | |
68 | if (next_pc != 0) | |
69 | return next_pc; | |
70 | ||
71 | /* Check with the default arm gdbarch_skip_trampoline. */ | |
72 | return arm_skip_stub (frame, pc); | |
73 | } | |
74 | ||
68070c10 PA |
75 | static void |
76 | arm_wince_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
77 | { | |
78 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
79 | ||
80 | tdep->arm_breakpoint = arm_wince_le_breakpoint; | |
81 | tdep->arm_breakpoint_size = sizeof (arm_wince_le_breakpoint); | |
190dce09 UW |
82 | tdep->thumb_breakpoint = arm_wince_thumb_le_breakpoint; |
83 | tdep->thumb_breakpoint_size = sizeof (arm_wince_thumb_le_breakpoint); | |
68070c10 PA |
84 | tdep->struct_return = pcc_struct_return; |
85 | ||
86 | tdep->fp_model = ARM_FLOAT_SOFT_VFP; | |
87 | ||
88 | tdep->jb_pc = ARM_WINCE_JB_PC; | |
89 | tdep->jb_elt_size = ARM_WINCE_JB_ELEMENT_SIZE; | |
90 | ||
91 | /* On ARM WinCE char defaults to signed. */ | |
92 | set_gdbarch_char_signed (gdbarch, 1); | |
93 | ||
68070c10 | 94 | /* Shared library handling. */ |
6dc13412 | 95 | set_gdbarch_skip_trampoline_code (gdbarch, arm_pe_skip_trampoline_code); |
190dce09 UW |
96 | |
97 | /* Single stepping. */ | |
98 | set_gdbarch_software_single_step (gdbarch, arm_software_single_step); | |
68070c10 PA |
99 | } |
100 | ||
101 | static enum gdb_osabi | |
102 | arm_wince_osabi_sniffer (bfd *abfd) | |
103 | { | |
104 | const char *target_name = bfd_get_target (abfd); | |
105 | ||
106 | if (strcmp (target_name, "pei-arm-wince-little") == 0) | |
107 | return GDB_OSABI_WINCE; | |
108 | ||
109 | return GDB_OSABI_UNKNOWN; | |
110 | } | |
111 | ||
112 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
113 | void _initialize_arm_wince_tdep (void); | |
114 | ||
115 | void | |
116 | _initialize_arm_wince_tdep (void) | |
117 | { | |
118 | gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_coff_flavour, | |
119 | arm_wince_osabi_sniffer); | |
120 | ||
121 | gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_WINCE, | |
122 | arm_wince_init_abi); | |
123 | } |