167 lines
5 KiB
C
167 lines
5 KiB
C
/* Target-dependent code for Windows CE running on ARM processors,
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for GDB.
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Copyright (C) 2007-2015 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "osabi.h"
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#include "gdbcore.h"
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#include "target.h"
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#include "frame.h"
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#include "arm-tdep.h"
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#include "windows-tdep.h"
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static const gdb_byte arm_wince_le_breakpoint[] = { 0x10, 0x00, 0x00, 0xe6 };
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static const gdb_byte arm_wince_thumb_le_breakpoint[] = { 0xfe, 0xdf };
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/* Description of the longjmp buffer. */
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#define ARM_WINCE_JB_ELEMENT_SIZE INT_REGISTER_SIZE
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#define ARM_WINCE_JB_PC 10
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static CORE_ADDR
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arm_pe_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
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{
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struct gdbarch *gdbarch = get_frame_arch (frame);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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ULONGEST indirect;
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struct bound_minimal_symbol indsym;
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const char *symname;
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CORE_ADDR next_pc;
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/* The format of an ARM DLL trampoline is:
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ldr ip, [pc]
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ldr pc, [ip]
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.dw __imp_<func>
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*/
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if (pc == 0
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|| read_memory_unsigned_integer (pc + 0, 4, byte_order) != 0xe59fc000
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|| read_memory_unsigned_integer (pc + 4, 4, byte_order) != 0xe59cf000)
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return 0;
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indirect = read_memory_unsigned_integer (pc + 8, 4, byte_order);
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if (indirect == 0)
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return 0;
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indsym = lookup_minimal_symbol_by_pc (indirect);
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if (indsym.minsym == NULL)
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return 0;
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symname = MSYMBOL_LINKAGE_NAME (indsym.minsym);
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if (symname == NULL || strncmp (symname, "__imp_", 6) != 0)
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return 0;
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next_pc = read_memory_unsigned_integer (indirect, 4, byte_order);
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if (next_pc != 0)
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return next_pc;
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/* Check with the default arm gdbarch_skip_trampoline. */
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return arm_skip_stub (frame, pc);
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}
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/* GCC emits a call to __gccmain in the prologue of main.
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The function below examines the code pointed at by PC and checks to
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see if it corresponds to a call to __gccmain. If so, it returns
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the address of the instruction following that call. Otherwise, it
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simply returns PC. */
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static CORE_ADDR
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arm_wince_skip_main_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
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{
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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ULONGEST this_instr;
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this_instr = read_memory_unsigned_integer (pc, 4, byte_order);
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/* bl offset <__gccmain> */
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if ((this_instr & 0xfff00000) == 0xeb000000)
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{
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#define sign_extend(V, N) \
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(((long) (V) ^ (1L << ((N) - 1))) - (1L << ((N) - 1)))
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long offset = sign_extend (this_instr & 0x000fffff, 23) << 2;
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CORE_ADDR call_dest = (pc + 8 + offset) & 0xffffffffU;
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struct bound_minimal_symbol s = lookup_minimal_symbol_by_pc (call_dest);
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if (s.minsym != NULL
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&& MSYMBOL_LINKAGE_NAME (s.minsym) != NULL
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&& strcmp (MSYMBOL_LINKAGE_NAME (s.minsym), "__gccmain") == 0)
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pc += 4;
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}
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return pc;
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}
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static void
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arm_wince_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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windows_init_abi (info, gdbarch);
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tdep->arm_breakpoint = arm_wince_le_breakpoint;
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tdep->arm_breakpoint_size = sizeof (arm_wince_le_breakpoint);
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tdep->thumb_breakpoint = arm_wince_thumb_le_breakpoint;
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tdep->thumb_breakpoint_size = sizeof (arm_wince_thumb_le_breakpoint);
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tdep->struct_return = pcc_struct_return;
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tdep->fp_model = ARM_FLOAT_SOFT_VFP;
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tdep->jb_pc = ARM_WINCE_JB_PC;
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tdep->jb_elt_size = ARM_WINCE_JB_ELEMENT_SIZE;
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/* On ARM WinCE char defaults to signed. */
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set_gdbarch_char_signed (gdbarch, 1);
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/* Shared library handling. */
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set_gdbarch_skip_trampoline_code (gdbarch, arm_pe_skip_trampoline_code);
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/* Single stepping. */
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set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
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/* Skip call to __gccmain that gcc places in main. */
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set_gdbarch_skip_main_prologue (gdbarch, arm_wince_skip_main_prologue);
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}
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static enum gdb_osabi
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arm_wince_osabi_sniffer (bfd *abfd)
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{
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const char *target_name = bfd_get_target (abfd);
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if (strcmp (target_name, "pei-arm-wince-little") == 0)
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return GDB_OSABI_WINCE;
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return GDB_OSABI_UNKNOWN;
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_arm_wince_tdep (void);
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void
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_initialize_arm_wince_tdep (void)
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{
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gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_coff_flavour,
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arm_wince_osabi_sniffer);
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gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_WINCE,
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arm_wince_init_abi);
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}
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