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 26#include "gdb_string.h" 27 28#include "arm-tdep.h" 29 30static const char arm_wince_le_breakpoint[] = { 0x10, 0x00, 0x00, 0xe6 }; 31static const char arm_wince_thumb_le_breakpoint[] = { 0xfe, 0xdf }; 32 33/* Description of the longjmp buffer. */ 34#define ARM_WINCE_JB_ELEMENT_SIZE INT_REGISTER_SIZE 35#define ARM_WINCE_JB_PC 10 36 37static CORE_ADDR 38arm_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 75static void 76arm_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); 82 tdep->thumb_breakpoint = arm_wince_thumb_le_breakpoint; 83 tdep->thumb_breakpoint_size = sizeof (arm_wince_thumb_le_breakpoint); 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 94 /* Shared library handling. */ 95 set_gdbarch_skip_trampoline_code (gdbarch, arm_pe_skip_trampoline_code); 96 97 /* Single stepping. */ 98 set_gdbarch_software_single_step (gdbarch, arm_software_single_step); 99} 100 101static enum gdb_osabi 102arm_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. */ 113void _initialize_arm_wince_tdep (void); 114 115void 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} 124