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- /* Target-dependent code for Windows CE running on ARM processors,
- for GDB.
- Copyright (C) 2007-2022 Free Software Foundation, Inc.
- This file is part of GDB.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- #include "defs.h"
- #include "osabi.h"
- #include "gdbcore.h"
- #include "target.h"
- #include "frame.h"
- #include "arch/arm.h"
- #include "arm-tdep.h"
- #include "windows-tdep.h"
- static const gdb_byte arm_wince_le_breakpoint[] = { 0x10, 0x00, 0x00, 0xe6 };
- static const gdb_byte arm_wince_thumb_le_breakpoint[] = { 0xfe, 0xdf };
- /* Description of the longjmp buffer. */
- #define ARM_WINCE_JB_ELEMENT_SIZE ARM_INT_REGISTER_SIZE
- #define ARM_WINCE_JB_PC 10
- static CORE_ADDR
- arm_pe_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
- {
- struct gdbarch *gdbarch = get_frame_arch (frame);
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- ULONGEST indirect;
- struct bound_minimal_symbol indsym;
- const char *symname;
- CORE_ADDR next_pc;
- /* The format of an ARM DLL trampoline is:
- ldr ip, [pc]
- ldr pc, [ip]
- .dw __imp_<func>
- */
- if (pc == 0
- || read_memory_unsigned_integer (pc + 0, 4, byte_order) != 0xe59fc000
- || read_memory_unsigned_integer (pc + 4, 4, byte_order) != 0xe59cf000)
- return 0;
- indirect = read_memory_unsigned_integer (pc + 8, 4, byte_order);
- if (indirect == 0)
- return 0;
- indsym = lookup_minimal_symbol_by_pc (indirect);
- if (indsym.minsym == NULL)
- return 0;
- symname = indsym.minsym->linkage_name ();
- if (symname == NULL || !startswith (symname, "__imp_"))
- return 0;
- next_pc = read_memory_unsigned_integer (indirect, 4, byte_order);
- if (next_pc != 0)
- return next_pc;
- /* Check with the default arm gdbarch_skip_trampoline. */
- return arm_skip_stub (frame, pc);
- }
- /* GCC emits a call to __gccmain in the prologue of main.
- The function below examines the code pointed at by PC and checks to
- see if it corresponds to a call to __gccmain. If so, it returns
- the address of the instruction following that call. Otherwise, it
- simply returns PC. */
- static CORE_ADDR
- arm_wince_skip_main_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
- {
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- ULONGEST this_instr;
- this_instr = read_memory_unsigned_integer (pc, 4, byte_order);
- /* bl offset <__gccmain> */
- if ((this_instr & 0xfff00000) == 0xeb000000)
- {
- #define sign_extend(V, N) \
- (((long) (V) ^ (1L << ((N) - 1))) - (1L << ((N) - 1)))
- long offset = sign_extend (this_instr & 0x000fffff, 23) << 2;
- CORE_ADDR call_dest = (pc + 8 + offset) & 0xffffffffU;
- struct bound_minimal_symbol s = lookup_minimal_symbol_by_pc (call_dest);
- if (s.minsym != NULL
- && s.minsym->linkage_name () != NULL
- && strcmp (s.minsym->linkage_name (), "__gccmain") == 0)
- pc += 4;
- }
- return pc;
- }
- static void
- arm_wince_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
- {
- arm_gdbarch_tdep *tdep = (arm_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- windows_init_abi (info, gdbarch);
- tdep->arm_breakpoint = arm_wince_le_breakpoint;
- tdep->arm_breakpoint_size = sizeof (arm_wince_le_breakpoint);
- tdep->thumb_breakpoint = arm_wince_thumb_le_breakpoint;
- tdep->thumb_breakpoint_size = sizeof (arm_wince_thumb_le_breakpoint);
- tdep->struct_return = pcc_struct_return;
- tdep->fp_model = ARM_FLOAT_SOFT_VFP;
- tdep->jb_pc = ARM_WINCE_JB_PC;
- tdep->jb_elt_size = ARM_WINCE_JB_ELEMENT_SIZE;
- /* On ARM WinCE char defaults to signed. */
- set_gdbarch_char_signed (gdbarch, 1);
- /* Shared library handling. */
- set_gdbarch_skip_trampoline_code (gdbarch, arm_pe_skip_trampoline_code);
- /* Single stepping. */
- set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
- /* Skip call to __gccmain that gcc places in main. */
- set_gdbarch_skip_main_prologue (gdbarch, arm_wince_skip_main_prologue);
- }
- static enum gdb_osabi
- arm_wince_osabi_sniffer (bfd *abfd)
- {
- const char *target_name = bfd_get_target (abfd);
- if (strcmp (target_name, "pei-arm-wince-little") == 0)
- return GDB_OSABI_WINCE;
- return GDB_OSABI_UNKNOWN;
- }
- void _initialize_arm_wince_tdep ();
- void
- _initialize_arm_wince_tdep ()
- {
- gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_coff_flavour,
- arm_wince_osabi_sniffer);
- gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_WINCE,
- arm_wince_init_abi);
- }
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