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/* Copyright (C) 2007 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 2 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#include "server.h"
#include "win32-low.h"
#define FCS_REGNUM 27
#define FOP_REGNUM 31
#define FLAG_TRACE_BIT 0x100
static unsigned dr[8];
static int debug_registers_changed = 0;
static int debug_registers_used = 0;
static void
i386_initial_stuff (void)
{
memset (&dr, 0, sizeof (dr));
debug_registers_changed = 0;
debug_registers_used = 0;
}
static void
i386_get_thread_context (win32_thread_info *th, DEBUG_EVENT* current_event)
{
th->context.ContextFlags = \
CONTEXT_FULL | \
CONTEXT_FLOATING_POINT | \
CONTEXT_EXTENDED_REGISTERS | \
CONTEXT_DEBUG_REGISTERS;
GetThreadContext (th->h, &th->context);
debug_registers_changed = 0;
if (th->tid == current_event->dwThreadId)
{
/* Copy dr values from the current thread. */
dr[0] = th->context.Dr0;
dr[1] = th->context.Dr1;
dr[2] = th->context.Dr2;
dr[3] = th->context.Dr3;
dr[6] = th->context.Dr6;
dr[7] = th->context.Dr7;
}
}
static void
i386_set_thread_context (win32_thread_info *th, DEBUG_EVENT* current_event)
{
if (debug_registers_changed)
{
th->context.Dr0 = dr[0];
th->context.Dr1 = dr[1];
th->context.Dr2 = dr[2];
th->context.Dr3 = dr[3];
/* th->context.Dr6 = dr[6];
FIXME: should we set dr6 also ?? */
th->context.Dr7 = dr[7];
}
SetThreadContext (th->h, &th->context);
}
static void
i386_thread_added (win32_thread_info *th)
{
/* Set the debug registers for the new thread if they are used. */
if (debug_registers_used)
{
th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
GetThreadContext (th->h, &th->context);
th->context.Dr0 = dr[0];
th->context.Dr1 = dr[1];
th->context.Dr2 = dr[2];
th->context.Dr3 = dr[3];
/* th->context.Dr6 = dr[6];
FIXME: should we set dr6 also ?? */
th->context.Dr7 = dr[7];
SetThreadContext (th->h, &th->context);
th->context.ContextFlags = 0;
}
}
static void
i386_single_step (win32_thread_info *th)
{
th->context.EFlags |= FLAG_TRACE_BIT;
}
/* An array of offset mappings into a Win32 Context structure.
This is a one-to-one mapping which is indexed by gdb's register
numbers. It retrieves an offset into the context structure where
the 4 byte register is located.
An offset value of -1 indicates that Win32 does not provide this
register in it's CONTEXT structure. In this case regptr will return
a pointer into a dummy register. */
#define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
static const int mappings[] = {
context_offset (Eax),
context_offset (Ecx),
context_offset (Edx),
context_offset (Ebx),
context_offset (Esp),
context_offset (Ebp),
context_offset (Esi),
context_offset (Edi),
context_offset (Eip),
context_offset (EFlags),
context_offset (SegCs),
context_offset (SegSs),
context_offset (SegDs),
context_offset (SegEs),
context_offset (SegFs),
context_offset (SegGs),
context_offset (FloatSave.RegisterArea[0 * 10]),
context_offset (FloatSave.RegisterArea[1 * 10]),
context_offset (FloatSave.RegisterArea[2 * 10]),
context_offset (FloatSave.RegisterArea[3 * 10]),
context_offset (FloatSave.RegisterArea[4 * 10]),
context_offset (FloatSave.RegisterArea[5 * 10]),
context_offset (FloatSave.RegisterArea[6 * 10]),
context_offset (FloatSave.RegisterArea[7 * 10]),
context_offset (FloatSave.ControlWord),
context_offset (FloatSave.StatusWord),
context_offset (FloatSave.TagWord),
context_offset (FloatSave.ErrorSelector),
context_offset (FloatSave.ErrorOffset),
context_offset (FloatSave.DataSelector),
context_offset (FloatSave.DataOffset),
context_offset (FloatSave.ErrorSelector),
/* XMM0-7 */
context_offset (ExtendedRegisters[10 * 16]),
context_offset (ExtendedRegisters[11 * 16]),
context_offset (ExtendedRegisters[12 * 16]),
context_offset (ExtendedRegisters[13 * 16]),
context_offset (ExtendedRegisters[14 * 16]),
context_offset (ExtendedRegisters[15 * 16]),
context_offset (ExtendedRegisters[16 * 16]),
context_offset (ExtendedRegisters[17 * 16]),
/* MXCSR */
context_offset (ExtendedRegisters[24])
};
#undef context_offset
/* Fetch register from gdbserver regcache data. */
static void
i386_fetch_inferior_register (win32_thread_info *th, int r)
{
char *context_offset = (char *) &th->context + mappings[r];
long l;
if (r == FCS_REGNUM)
{
l = *((long *) context_offset) & 0xffff;
supply_register (r, (char *) &l);
}
else if (r == FOP_REGNUM)
{
l = (*((long *) context_offset) >> 16) & ((1 << 11) - 1);
supply_register (r, (char *) &l);
}
else
supply_register (r, context_offset);
}
/* Store a new register value into the thread context of TH. */
static void
i386_store_inferior_register (win32_thread_info *th, int r)
{
char *context_offset = (char *) &th->context + mappings[r];
collect_register (r, context_offset);
}
struct win32_target_ops the_low_target = {
sizeof (mappings) / sizeof (mappings[0]),
i386_initial_stuff,
i386_get_thread_context,
i386_set_thread_context,
i386_thread_added,
i386_fetch_inferior_register,
i386_store_inferior_register,
i386_single_step,
NULL, /* breakpoint */
0, /* breakpoint_len */
"i386" /* arch_string */
};
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