| 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 |
| 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 | #include "osabi.h" |
| 23 | #include "gdbcore.h" |
| 24 | #include "target.h" |
| 25 | #include "solib.h" |
| 26 | #include "solib-target.h" |
| 27 | |
| 28 | #include "gdb_string.h" |
| 29 | |
| 30 | #include "arm-tdep.h" |
| 31 | |
| 32 | static const char arm_wince_le_breakpoint[] = { 0x10, 0x00, 0x00, 0xe6 }; |
| 33 | static const char 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 | ULONGEST indirect; |
| 43 | struct minimal_symbol *indsym; |
| 44 | char *symname; |
| 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 |
| 53 | || read_memory_unsigned_integer (pc + 0, 4) != 0xe59fc000 |
| 54 | || read_memory_unsigned_integer (pc + 4, 4) != 0xe59cf000) |
| 55 | return 0; |
| 56 | |
| 57 | indirect = read_memory_unsigned_integer (pc + 8, 4); |
| 58 | if (indirect == 0) |
| 59 | return 0; |
| 60 | |
| 61 | indsym = lookup_minimal_symbol_by_pc (indirect); |
| 62 | if (indsym == NULL) |
| 63 | return 0; |
| 64 | |
| 65 | symname = SYMBOL_LINKAGE_NAME (indsym); |
| 66 | if (symname == NULL || strncmp (symname, "__imp_", 6) != 0) |
| 67 | return 0; |
| 68 | |
| 69 | next_pc = read_memory_unsigned_integer (indirect, 4); |
| 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 | |
| 77 | static void |
| 78 | arm_wince_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 79 | { |
| 80 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 81 | |
| 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; |
| 87 | |
| 88 | tdep->fp_model = ARM_FLOAT_SOFT_VFP; |
| 89 | |
| 90 | tdep->jb_pc = ARM_WINCE_JB_PC; |
| 91 | tdep->jb_elt_size = ARM_WINCE_JB_ELEMENT_SIZE; |
| 92 | |
| 93 | /* On ARM WinCE char defaults to signed. */ |
| 94 | set_gdbarch_char_signed (gdbarch, 1); |
| 95 | |
| 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); |
| 99 | |
| 100 | /* Single stepping. */ |
| 101 | set_gdbarch_software_single_step (gdbarch, arm_software_single_step); |
| 102 | } |
| 103 | |
| 104 | static enum gdb_osabi |
| 105 | arm_wince_osabi_sniffer (bfd *abfd) |
| 106 | { |
| 107 | const char *target_name = bfd_get_target (abfd); |
| 108 | |
| 109 | if (strcmp (target_name, "pei-arm-wince-little") == 0) |
| 110 | return GDB_OSABI_WINCE; |
| 111 | |
| 112 | return GDB_OSABI_UNKNOWN; |
| 113 | } |
| 114 | |
| 115 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 116 | void _initialize_arm_wince_tdep (void); |
| 117 | |
| 118 | void |
| 119 | _initialize_arm_wince_tdep (void) |
| 120 | { |
| 121 | gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_coff_flavour, |
| 122 | arm_wince_osabi_sniffer); |
| 123 | |
| 124 | gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_WINCE, |
| 125 | arm_wince_init_abi); |
| 126 | } |