binutils-gdb/gdb/gdbserver/win32-i386-low.c

432 lines
12 KiB
C

/* Copyright (C) 2007-2014 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 "server.h"
#include "win32-low.h"
#include "i386-low.h"
#ifndef CONTEXT_EXTENDED_REGISTERS
#define CONTEXT_EXTENDED_REGISTERS 0
#endif
#define FCS_REGNUM 27
#define FOP_REGNUM 31
#define FLAG_TRACE_BIT 0x100
#ifdef __x86_64__
/* Defined in auto-generated file reg-amd64.c. */
void init_registers_amd64 (void);
extern const struct target_desc *tdesc_amd64;
#else
/* Defined in auto-generated file reg-i386.c. */
void init_registers_i386 (void);
extern const struct target_desc *tdesc_i386;
#endif
static struct i386_debug_reg_state debug_reg_state;
static int debug_registers_changed = 0;
static int debug_registers_used = 0;
/* Update the inferior's debug register REGNUM from STATE. */
void
i386_dr_low_set_addr (const struct i386_debug_reg_state *state, int regnum)
{
if (! (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR))
fatal ("Invalid debug register %d", regnum);
/* debug_reg_state.dr_mirror is already set.
Just notify i386_set_thread_context, i386_thread_added
that the registers need to be updated. */
debug_registers_changed = 1;
debug_registers_used = 1;
}
CORE_ADDR
i386_dr_low_get_addr (int regnum)
{
gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
return debug_reg_state.dr_mirror[regnum];
}
/* Update the inferior's DR7 debug control register from STATE. */
void
i386_dr_low_set_control (const struct i386_debug_reg_state *state)
{
/* debug_reg_state.dr_control_mirror is already set.
Just notify i386_set_thread_context, i386_thread_added
that the registers need to be updated. */
debug_registers_changed = 1;
debug_registers_used = 1;
}
unsigned
i386_dr_low_get_control (void)
{
return debug_reg_state.dr_control_mirror;
}
/* Get the value of the DR6 debug status register from the inferior
and record it in STATE. */
unsigned
i386_dr_low_get_status (void)
{
/* We don't need to do anything here, the last call to thread_rec for
current_event.dwThreadId id has already set it. */
return debug_reg_state.dr_status_mirror;
}
/* Watchpoint support. */
static int
i386_insert_point (char type, CORE_ADDR addr, int len)
{
switch (type)
{
case '2':
case '3':
case '4':
return i386_low_insert_watchpoint (&debug_reg_state,
type, addr, len);
default:
/* Unsupported. */
return 1;
}
}
static int
i386_remove_point (char type, CORE_ADDR addr, int len)
{
switch (type)
{
case '2':
case '3':
case '4':
return i386_low_remove_watchpoint (&debug_reg_state,
type, addr, len);
default:
/* Unsupported. */
return 1;
}
}
static int
i386_stopped_by_watchpoint (void)
{
return i386_low_stopped_by_watchpoint (&debug_reg_state);
}
static CORE_ADDR
i386_stopped_data_address (void)
{
CORE_ADDR addr;
if (i386_low_stopped_data_address (&debug_reg_state, &addr))
return addr;
return 0;
}
static void
i386_initial_stuff (void)
{
i386_low_init_dregs (&debug_reg_state);
debug_registers_changed = 0;
debug_registers_used = 0;
}
static void
i386_get_thread_context (win32_thread_info *th, DEBUG_EVENT* current_event)
{
/* Requesting the CONTEXT_EXTENDED_REGISTERS register set fails if
the system doesn't support extended registers. */
static DWORD extended_registers = CONTEXT_EXTENDED_REGISTERS;
again:
th->context.ContextFlags = (CONTEXT_FULL
| CONTEXT_FLOATING_POINT
| CONTEXT_DEBUG_REGISTERS
| extended_registers);
if (!GetThreadContext (th->h, &th->context))
{
DWORD e = GetLastError ();
if (extended_registers && e == ERROR_INVALID_PARAMETER)
{
extended_registers = 0;
goto again;
}
error ("GetThreadContext failure %ld\n", (long) e);
}
debug_registers_changed = 0;
if (th->tid == current_event->dwThreadId)
{
/* Copy dr values from the current thread. */
struct i386_debug_reg_state *dr = &debug_reg_state;
dr->dr_mirror[0] = th->context.Dr0;
dr->dr_mirror[1] = th->context.Dr1;
dr->dr_mirror[2] = th->context.Dr2;
dr->dr_mirror[3] = th->context.Dr3;
dr->dr_status_mirror = th->context.Dr6;
dr->dr_control_mirror = th->context.Dr7;
}
}
static void
i386_set_thread_context (win32_thread_info *th, DEBUG_EVENT* current_event)
{
if (debug_registers_changed)
{
struct i386_debug_reg_state *dr = &debug_reg_state;
th->context.Dr0 = dr->dr_mirror[0];
th->context.Dr1 = dr->dr_mirror[1];
th->context.Dr2 = dr->dr_mirror[2];
th->context.Dr3 = dr->dr_mirror[3];
/* th->context.Dr6 = dr->dr_status_mirror;
FIXME: should we set dr6 also ?? */
th->context.Dr7 = dr->dr_control_mirror;
}
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)
{
struct i386_debug_reg_state *dr = &debug_reg_state;
th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
GetThreadContext (th->h, &th->context);
th->context.Dr0 = dr->dr_mirror[0];
th->context.Dr1 = dr->dr_mirror[1];
th->context.Dr2 = dr->dr_mirror[2];
th->context.Dr3 = dr->dr_mirror[3];
/* th->context.Dr6 = dr->dr_status_mirror;
FIXME: should we set dr6 also ?? */
th->context.Dr7 = dr->dr_control_mirror;
SetThreadContext (th->h, &th->context);
th->context.ContextFlags = 0;
}
}
static void
i386_single_step (win32_thread_info *th)
{
th->context.EFlags |= FLAG_TRACE_BIT;
}
#ifndef __x86_64__
/* 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
#else /* __x86_64__ */
#define context_offset(x) (offsetof (CONTEXT, x))
static const int mappings[] =
{
context_offset (Rax),
context_offset (Rbx),
context_offset (Rcx),
context_offset (Rdx),
context_offset (Rsi),
context_offset (Rdi),
context_offset (Rbp),
context_offset (Rsp),
context_offset (R8),
context_offset (R9),
context_offset (R10),
context_offset (R11),
context_offset (R12),
context_offset (R13),
context_offset (R14),
context_offset (R15),
context_offset (Rip),
context_offset (EFlags),
context_offset (SegCs),
context_offset (SegSs),
context_offset (SegDs),
context_offset (SegEs),
context_offset (SegFs),
context_offset (SegGs),
context_offset (FloatSave.FloatRegisters[0]),
context_offset (FloatSave.FloatRegisters[1]),
context_offset (FloatSave.FloatRegisters[2]),
context_offset (FloatSave.FloatRegisters[3]),
context_offset (FloatSave.FloatRegisters[4]),
context_offset (FloatSave.FloatRegisters[5]),
context_offset (FloatSave.FloatRegisters[6]),
context_offset (FloatSave.FloatRegisters[7]),
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 (Xmm0),
context_offset (Xmm1),
context_offset (Xmm2),
context_offset (Xmm3),
context_offset (Xmm4),
context_offset (Xmm5),
context_offset (Xmm6),
context_offset (Xmm7),
context_offset (Xmm8),
context_offset (Xmm9),
context_offset (Xmm10),
context_offset (Xmm11),
context_offset (Xmm12),
context_offset (Xmm13),
context_offset (Xmm14),
context_offset (Xmm15),
/* MXCSR */
context_offset (FloatSave.MxCsr)
};
#undef context_offset
#endif /* __x86_64__ */
/* Fetch register from gdbserver regcache data. */
static void
i386_fetch_inferior_register (struct regcache *regcache,
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 (regcache, r, (char *) &l);
}
else if (r == FOP_REGNUM)
{
l = (*((long *) context_offset) >> 16) & ((1 << 11) - 1);
supply_register (regcache, r, (char *) &l);
}
else
supply_register (regcache, r, context_offset);
}
/* Store a new register value into the thread context of TH. */
static void
i386_store_inferior_register (struct regcache *regcache,
win32_thread_info *th, int r)
{
char *context_offset = (char *) &th->context + mappings[r];
collect_register (regcache, r, context_offset);
}
static const unsigned char i386_win32_breakpoint = 0xcc;
#define i386_win32_breakpoint_len 1
static void
i386_arch_setup (void)
{
#ifdef __x86_64__
init_registers_amd64 ();
win32_tdesc = tdesc_amd64;
#else
init_registers_i386 ();
win32_tdesc = tdesc_i386;
#endif
}
struct win32_target_ops the_low_target = {
i386_arch_setup,
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,
&i386_win32_breakpoint,
i386_win32_breakpoint_len,
i386_insert_point,
i386_remove_point,
i386_stopped_by_watchpoint,
i386_stopped_data_address
};