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/* Target-dependent code for Windows (including Cygwin) running on i386's,
for GDB.
Copyright (C) 2003-2024 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 "i386-tdep.h"
#include "windows-tdep.h"
#include "regset.h"
#include "gdbsupport/gdb_obstack.h"
#include "xml-support.h"
#include "gdbcore.h"
#include "inferior.h"
#include "frame-unwind.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 (const frame_info_ptr &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 (function->type ());
if (type->code () == TYPE_CODE_PTR)
type = check_typedef (type->target_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 (0).is_artificial ()
&& 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)
{
i386_gdbarch_tdep *tdep = gdbarch_tdep<i386_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);
}
/* Sigwrapper unwinder instruction patterns for i386. */
static const gdb_byte i386_sigbe_bytes[] = {
0xb8, 0xfc, 0xff, 0xff, 0xff, /* movl $-4,%eax */
0x0f, 0xc1, 0x83, /* xadd %eax,$tls::stackptr(%ebx) */
/* 4 bytes for tls::stackptr operand. */
};
static const gdb::array_view<const gdb_byte> i386_sig_patterns[] {
{ i386_sigbe_bytes },
};
/* The sigwrapper unwinder on i386. */
static const cygwin_sigwrapper_frame_unwind
i386_cygwin_sigwrapper_frame_unwind (i386_sig_patterns);
/* gdbarch initialization for Cygwin on i386. */
static void
i386_cygwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
frame_unwind_append_unwinder (gdbarch, &i386_cygwin_sigwrapper_frame_unwind);
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);
}
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