/* Target-dependent code for Windows (including Cygwin) running on i386's, for GDB. Copyright (C) 2003-2020 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 . */ #include "defs.h" #include "osabi.h" #include "i386-tdep.h" #include "windows-tdep.h" #include "regset.h" #include "gdb_obstack.h" #include "xml-support.h" #include "gdbcore.h" #include "inferior.h" /* Core file support. */ /* This vector maps GDB's idea of a register's number into an address in the windows exception context vector. */ static int i386_windows_gregset_reg_offset[] = { 176, /* eax */ 172, /* ecx */ 168, /* edx */ 164, /* ebx */ 196, /* esp */ 180, /* ebp */ 160, /* esi */ 156, /* edi */ 184, /* eip */ 192, /* eflags */ 188, /* cs */ 200, /* ss */ 152, /* ds */ 148, /* es */ 144, /* fs */ 140, /* gs */ 56, /* FloatSave.RegisterArea[0 * 10] */ 66, /* FloatSave.RegisterArea[1 * 10] */ 76, /* FloatSave.RegisterArea[2 * 10] */ 86, /* FloatSave.RegisterArea[3 * 10] */ 96, /* FloatSave.RegisterArea[4 * 10] */ 106, /* FloatSave.RegisterArea[5 * 10] */ 116, /* FloatSave.RegisterArea[6 * 10] */ 126, /* FloatSave.RegisterArea[7 * 10] */ 28, /* FloatSave.ControlWord */ 32, /* FloatSave.StatusWord */ 36, /* FloatSave.TagWord */ 44, /* FloatSave.ErrorSelector */ 40, /* FloatSave.ErrorOffset */ 52, /* FloatSave.DataSelector */ 48, /* FloatSave.DataOffset */ 44, /* FloatSave.ErrorSelector */ /* XMM0-7 */ 364, /* ExtendedRegisters[10*16] */ 380, /* ExtendedRegisters[11*16] */ 396, /* ExtendedRegisters[12*16] */ 412, /* ExtendedRegisters[13*16] */ 428, /* ExtendedRegisters[14*16] */ 444, /* ExtendedRegisters[15*16] */ 460, /* ExtendedRegisters[16*16] */ 476, /* ExtendedRegisters[17*16] */ /* MXCSR */ 228 /* ExtendedRegisters[24] */ }; #define I386_WINDOWS_SIZEOF_GREGSET 716 static CORE_ADDR i386_windows_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) { return i386_pe_skip_trampoline_code (frame, pc, NULL); } static const char * i386_windows_auto_wide_charset (void) { return "UTF-16"; } /* Implement the "push_dummy_call" gdbarch method. */ static CORE_ADDR i386_windows_push_dummy_call (struct gdbarch *gdbarch, struct value *function, struct regcache *regcache, CORE_ADDR bp_addr, int nargs, struct value **args, CORE_ADDR sp, function_call_return_method return_method, CORE_ADDR struct_addr) { /* For non-static member functions of 32bit Windows programs, the thiscall calling convention is used, so the 'this' pointer is passed in ECX. */ bool thiscall = false; struct type *type = check_typedef (value_type (function)); if (type->code () == TYPE_CODE_PTR) type = check_typedef (TYPE_TARGET_TYPE (type)); /* read_subroutine_type sets for non-static member functions the artificial flag of the first parameter ('this' pointer). */ if (type->code () == TYPE_CODE_METHOD && type->num_fields () > 0 && TYPE_FIELD_ARTIFICIAL (type, 0) && type->field (0).type ()->code () == TYPE_CODE_PTR) thiscall = 1; return i386_thiscall_push_dummy_call (gdbarch, function, regcache, bp_addr, nargs, args, sp, return_method, struct_addr, thiscall); } /* Common parts for gdbarch initialization for Windows and Cygwin on i386. */ static void i386_windows_init_abi_common (struct gdbarch_info info, struct gdbarch *gdbarch) { struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); set_gdbarch_skip_trampoline_code (gdbarch, i386_windows_skip_trampoline_code); set_gdbarch_skip_main_prologue (gdbarch, i386_skip_main_prologue); tdep->struct_return = reg_struct_return; tdep->gregset_reg_offset = i386_windows_gregset_reg_offset; tdep->gregset_num_regs = ARRAY_SIZE (i386_windows_gregset_reg_offset); tdep->sizeof_gregset = I386_WINDOWS_SIZEOF_GREGSET; tdep->sizeof_fpregset = 0; /* Core file support. */ set_gdbarch_core_xfer_shared_libraries (gdbarch, windows_core_xfer_shared_libraries); set_gdbarch_core_pid_to_str (gdbarch, windows_core_pid_to_str); set_gdbarch_auto_wide_charset (gdbarch, i386_windows_auto_wide_charset); } /* gdbarch initialization for Windows on i386. */ static void i386_windows_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) { i386_windows_init_abi_common (info, gdbarch); windows_init_abi (info, gdbarch); set_gdbarch_push_dummy_call (gdbarch, i386_windows_push_dummy_call); } /* gdbarch initialization for Cygwin on i386. */ static void i386_cygwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) { i386_windows_init_abi_common (info, gdbarch); cygwin_init_abi (info, gdbarch); } static gdb_osabi i386_windows_osabi_sniffer (bfd *abfd) { const char *target_name = bfd_get_target (abfd); if (!streq (target_name, "pei-i386")) return GDB_OSABI_UNKNOWN; if (is_linked_with_cygwin_dll (abfd)) return GDB_OSABI_CYGWIN; return GDB_OSABI_WINDOWS; } static enum gdb_osabi i386_cygwin_core_osabi_sniffer (bfd *abfd) { const char *target_name = bfd_get_target (abfd); /* Cygwin uses elf core dumps. Do not claim all ELF executables, check whether there is a .reg section of proper size. */ if (strcmp (target_name, "elf32-i386") == 0) { asection *section = bfd_get_section_by_name (abfd, ".reg"); if (section != nullptr && bfd_section_size (section) == I386_WINDOWS_SIZEOF_GREGSET) return GDB_OSABI_CYGWIN; } return GDB_OSABI_UNKNOWN; } void _initialize_i386_windows_tdep (); void _initialize_i386_windows_tdep () { gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour, i386_windows_osabi_sniffer); /* Cygwin uses elf core dumps. */ gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour, i386_cygwin_core_osabi_sniffer); gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_WINDOWS, i386_windows_init_abi); gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_CYGWIN, i386_cygwin_init_abi); }