1 /* Target-dependent code for Windows CE running on ARM processors,
4 Copyright (C) 2007-2019 Free Software Foundation, Inc.
6 This file is part of GDB.
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.
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.
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/>. */
23 /* Local non-gdb includes. */
30 #include "windows-tdep.h"
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 };
35 /* Description of the longjmp buffer. */
36 #define ARM_WINCE_JB_ELEMENT_SIZE INT_REGISTER_SIZE
37 #define ARM_WINCE_JB_PC 10
40 arm_pe_skip_trampoline_code (struct frame_info
*frame
, CORE_ADDR pc
)
42 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
43 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
45 struct bound_minimal_symbol indsym
;
49 /* The format of an ARM DLL trampoline is:
58 || read_memory_unsigned_integer (pc
+ 0, 4, byte_order
) != 0xe59fc000
59 || read_memory_unsigned_integer (pc
+ 4, 4, byte_order
) != 0xe59cf000)
62 indirect
= read_memory_unsigned_integer (pc
+ 8, 4, byte_order
);
66 indsym
= lookup_minimal_symbol_by_pc (indirect
);
67 if (indsym
.minsym
== NULL
)
70 symname
= MSYMBOL_LINKAGE_NAME (indsym
.minsym
);
71 if (symname
== NULL
|| !startswith (symname
, "__imp_"))
74 next_pc
= read_memory_unsigned_integer (indirect
, 4, byte_order
);
78 /* Check with the default arm gdbarch_skip_trampoline. */
79 return arm_skip_stub (frame
, pc
);
82 /* GCC emits a call to __gccmain in the prologue of main.
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
90 arm_wince_skip_main_prologue (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
92 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
95 this_instr
= read_memory_unsigned_integer (pc
, 4, byte_order
);
97 /* bl offset <__gccmain> */
98 if ((this_instr
& 0xfff00000) == 0xeb000000)
100 #define sign_extend(V, N) \
101 (((long) (V) ^ (1L << ((N) - 1))) - (1L << ((N) - 1)))
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
);
108 && MSYMBOL_LINKAGE_NAME (s
.minsym
) != NULL
109 && strcmp (MSYMBOL_LINKAGE_NAME (s
.minsym
), "__gccmain") == 0)
117 arm_wince_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
119 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
121 windows_init_abi (info
, gdbarch
);
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
;
129 tdep
->fp_model
= ARM_FLOAT_SOFT_VFP
;
131 tdep
->jb_pc
= ARM_WINCE_JB_PC
;
132 tdep
->jb_elt_size
= ARM_WINCE_JB_ELEMENT_SIZE
;
134 /* On ARM WinCE char defaults to signed. */
135 set_gdbarch_char_signed (gdbarch
, 1);
137 /* Shared library handling. */
138 set_gdbarch_skip_trampoline_code (gdbarch
, arm_pe_skip_trampoline_code
);
140 /* Single stepping. */
141 set_gdbarch_software_single_step (gdbarch
, arm_software_single_step
);
143 /* Skip call to __gccmain that gcc places in main. */
144 set_gdbarch_skip_main_prologue (gdbarch
, arm_wince_skip_main_prologue
);
147 static enum gdb_osabi
148 arm_wince_osabi_sniffer (bfd
*abfd
)
150 const char *target_name
= bfd_get_target (abfd
);
152 if (strcmp (target_name
, "pei-arm-wince-little") == 0)
153 return GDB_OSABI_WINCE
;
155 return GDB_OSABI_UNKNOWN
;
159 _initialize_arm_wince_tdep (void)
161 gdbarch_register_osabi_sniffer (bfd_arch_arm
, bfd_target_coff_flavour
,
162 arm_wince_osabi_sniffer
);
164 gdbarch_register_osabi (bfd_arch_arm
, 0, GDB_OSABI_WINCE
,