Sort includes for files gdb/[a-f]*.[chyl].
[deliverable/binutils-gdb.git] / gdb / arm-wince-tdep.c
1 /* Target-dependent code for Windows CE running on ARM processors,
2 for GDB.
3
4 Copyright (C) 2007-2019 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
10 the Free Software Foundation; either version 3 of the License, or
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
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20
21 #include "defs.h"
22
23 /* Local non-gdb includes. */
24 #include "arch/arm.h"
25 #include "arm-tdep.h"
26 #include "frame.h"
27 #include "gdbcore.h"
28 #include "osabi.h"
29 #include "target.h"
30 #include "windows-tdep.h"
31
32 static const gdb_byte arm_wince_le_breakpoint[] = { 0x10, 0x00, 0x00, 0xe6 };
33 static const gdb_byte arm_wince_thumb_le_breakpoint[] = { 0xfe, 0xdf };
34
35 /* Description of the longjmp buffer. */
36 #define ARM_WINCE_JB_ELEMENT_SIZE INT_REGISTER_SIZE
37 #define ARM_WINCE_JB_PC 10
38
39 static CORE_ADDR
40 arm_pe_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
41 {
42 struct gdbarch *gdbarch = get_frame_arch (frame);
43 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
44 ULONGEST indirect;
45 struct bound_minimal_symbol indsym;
46 const char *symname;
47 CORE_ADDR next_pc;
48
49 /* The format of an ARM DLL trampoline is:
50
51 ldr ip, [pc]
52 ldr pc, [ip]
53 .dw __imp_<func>
54
55 */
56
57 if (pc == 0
58 || read_memory_unsigned_integer (pc + 0, 4, byte_order) != 0xe59fc000
59 || read_memory_unsigned_integer (pc + 4, 4, byte_order) != 0xe59cf000)
60 return 0;
61
62 indirect = read_memory_unsigned_integer (pc + 8, 4, byte_order);
63 if (indirect == 0)
64 return 0;
65
66 indsym = lookup_minimal_symbol_by_pc (indirect);
67 if (indsym.minsym == NULL)
68 return 0;
69
70 symname = MSYMBOL_LINKAGE_NAME (indsym.minsym);
71 if (symname == NULL || !startswith (symname, "__imp_"))
72 return 0;
73
74 next_pc = read_memory_unsigned_integer (indirect, 4, byte_order);
75 if (next_pc != 0)
76 return next_pc;
77
78 /* Check with the default arm gdbarch_skip_trampoline. */
79 return arm_skip_stub (frame, pc);
80 }
81
82 /* GCC emits a call to __gccmain in the prologue of main.
83
84 The function below examines the code pointed at by PC and checks to
85 see if it corresponds to a call to __gccmain. If so, it returns
86 the address of the instruction following that call. Otherwise, it
87 simply returns PC. */
88
89 static CORE_ADDR
90 arm_wince_skip_main_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
91 {
92 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
93 ULONGEST this_instr;
94
95 this_instr = read_memory_unsigned_integer (pc, 4, byte_order);
96
97 /* bl offset <__gccmain> */
98 if ((this_instr & 0xfff00000) == 0xeb000000)
99 {
100 #define sign_extend(V, N) \
101 (((long) (V) ^ (1L << ((N) - 1))) - (1L << ((N) - 1)))
102
103 long offset = sign_extend (this_instr & 0x000fffff, 23) << 2;
104 CORE_ADDR call_dest = (pc + 8 + offset) & 0xffffffffU;
105 struct bound_minimal_symbol s = lookup_minimal_symbol_by_pc (call_dest);
106
107 if (s.minsym != NULL
108 && MSYMBOL_LINKAGE_NAME (s.minsym) != NULL
109 && strcmp (MSYMBOL_LINKAGE_NAME (s.minsym), "__gccmain") == 0)
110 pc += 4;
111 }
112
113 return pc;
114 }
115
116 static void
117 arm_wince_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
118 {
119 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
120
121 windows_init_abi (info, gdbarch);
122
123 tdep->arm_breakpoint = arm_wince_le_breakpoint;
124 tdep->arm_breakpoint_size = sizeof (arm_wince_le_breakpoint);
125 tdep->thumb_breakpoint = arm_wince_thumb_le_breakpoint;
126 tdep->thumb_breakpoint_size = sizeof (arm_wince_thumb_le_breakpoint);
127 tdep->struct_return = pcc_struct_return;
128
129 tdep->fp_model = ARM_FLOAT_SOFT_VFP;
130
131 tdep->jb_pc = ARM_WINCE_JB_PC;
132 tdep->jb_elt_size = ARM_WINCE_JB_ELEMENT_SIZE;
133
134 /* On ARM WinCE char defaults to signed. */
135 set_gdbarch_char_signed (gdbarch, 1);
136
137 /* Shared library handling. */
138 set_gdbarch_skip_trampoline_code (gdbarch, arm_pe_skip_trampoline_code);
139
140 /* Single stepping. */
141 set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
142
143 /* Skip call to __gccmain that gcc places in main. */
144 set_gdbarch_skip_main_prologue (gdbarch, arm_wince_skip_main_prologue);
145 }
146
147 static enum gdb_osabi
148 arm_wince_osabi_sniffer (bfd *abfd)
149 {
150 const char *target_name = bfd_get_target (abfd);
151
152 if (strcmp (target_name, "pei-arm-wince-little") == 0)
153 return GDB_OSABI_WINCE;
154
155 return GDB_OSABI_UNKNOWN;
156 }
157
158 void
159 _initialize_arm_wince_tdep (void)
160 {
161 gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_coff_flavour,
162 arm_wince_osabi_sniffer);
163
164 gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_WINCE,
165 arm_wince_init_abi);
166 }
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