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[gdb.git] / gdb / arm-wince-tdep.c
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1 /* Target-dependent code for Windows CE running on ARM processors,
2 for GDB.
4 Copyright (C) 2007, 2008 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/>. */
21 #include "defs.h"
22 #include "osabi.h"
23 #include "gdbcore.h"
24 #include "target.h"
25 #include "solib.h"
26 #include "solib-target.h"
28 #include "gdb_string.h"
30 #include "arm-tdep.h"
32 static const char arm_wince_le_breakpoint[] = { 0x10, 0x00, 0x00, 0xe6 };
33 static const char 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
39 static CORE_ADDR
40 arm_pe_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
42 ULONGEST indirect;
43 struct minimal_symbol *indsym;
44 char *symname;
45 CORE_ADDR next_pc;
47 /* The format of an ARM DLL trampoline is:
48 ldr ip, [pc]
49 ldr pc, [ip]
50 .dw __imp_<func> */
52 if (pc == 0
53 || read_memory_unsigned_integer (pc + 0, 4) != 0xe59fc000
54 || read_memory_unsigned_integer (pc + 4, 4) != 0xe59cf000)
55 return 0;
57 indirect = read_memory_unsigned_integer (pc + 8, 4);
58 if (indirect == 0)
59 return 0;
61 indsym = lookup_minimal_symbol_by_pc (indirect);
62 if (indsym == NULL)
63 return 0;
65 symname = SYMBOL_LINKAGE_NAME (indsym);
66 if (symname == NULL || strncmp (symname, "__imp_", 6) != 0)
67 return 0;
69 next_pc = read_memory_unsigned_integer (indirect, 4);
70 if (next_pc != 0)
71 return next_pc;
73 /* Check with the default arm gdbarch_skip_trampoline. */
74 return arm_skip_stub (frame, pc);
77 static void
78 arm_wince_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
80 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
82 tdep->arm_breakpoint = arm_wince_le_breakpoint;
83 tdep->arm_breakpoint_size = sizeof (arm_wince_le_breakpoint);
84 tdep->thumb_breakpoint = arm_wince_thumb_le_breakpoint;
85 tdep->thumb_breakpoint_size = sizeof (arm_wince_thumb_le_breakpoint);
86 tdep->struct_return = pcc_struct_return;
88 tdep->fp_model = ARM_FLOAT_SOFT_VFP;
90 tdep->jb_pc = ARM_WINCE_JB_PC;
91 tdep->jb_elt_size = ARM_WINCE_JB_ELEMENT_SIZE;
93 /* On ARM WinCE char defaults to signed. */
94 set_gdbarch_char_signed (gdbarch, 1);
96 /* Shared library handling. */
97 set_solib_ops (gdbarch, &solib_target_so_ops);
98 set_gdbarch_skip_trampoline_code (gdbarch, arm_pe_skip_trampoline_code);
100 /* Single stepping. */
101 set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
104 static enum gdb_osabi
105 arm_wince_osabi_sniffer (bfd *abfd)
107 const char *target_name = bfd_get_target (abfd);
109 if (strcmp (target_name, "pei-arm-wince-little") == 0)
110 return GDB_OSABI_WINCE;
112 return GDB_OSABI_UNKNOWN;
115 /* Provide a prototype to silence -Wmissing-prototypes. */
116 void _initialize_arm_wince_tdep (void);
118 void
119 _initialize_arm_wince_tdep (void)
121 gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_coff_flavour,
122 arm_wince_osabi_sniffer);
124 gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_WINCE,
125 arm_wince_init_abi);