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ntoskrnl: Add initial code to emulate memory access to USER_SHARED_DATA on x86_64.

This commit is contained in:
Sebastian Lackner 2015-06-19 03:58:41 +02:00 committed by Alexandre Julliard
parent c81ff0f8cf
commit 0b06d4c4a3
2 changed files with 261 additions and 4 deletions
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263
dlls/ntoskrnl.exe/instr.c
View File

@ -4,6 +4,7 @@
* Copyright 1995 Alexandre Julliard
* Copyright 2005 Ivan Leo Puoti
* Copyright 2005 Laurent Pinchart
* Copyright 2014-2015 Sebastian Lackner
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@ -23,17 +24,19 @@
#include "config.h"
#include "wine/port.h"
#ifdef __i386__
#include <stdarg.h>
#include "windef.h"
#include "winbase.h"
#include "winternl.h"
#define WIN32_NO_STATUS
#include "ddk/wdm.h"
#include "excpt.h"
#include "wine/debug.h"
#include "wine/exception.h"
#ifdef __i386__
WINE_DEFAULT_DEBUG_CHANNEL(int);
#include "pshpack1.h"
@ -475,4 +478,258 @@ LONG CALLBACK vectored_handler( EXCEPTION_POINTERS *ptrs )
return EXCEPTION_CONTINUE_SEARCH;
}
#endif /* __i386__ */
#elif defined(__x86_64__) /* __i386__ */
WINE_DEFAULT_DEBUG_CHANNEL(int);
#define REX_B 1
#define REX_X 2
#define REX_R 4
#define REX_W 8
#define REGMODRM_MOD( regmodrm, rex ) ((regmodrm) >> 6)
#define REGMODRM_REG( regmodrm, rex ) (((regmodrm) >> 3) & 7) | (((rex) & REX_R) ? 8 : 0)
#define REGMODRM_RM( regmodrm, rex ) (((regmodrm) & 7) | (((rex) & REX_B) ? 8 : 0))
#define SIB_SS( sib, rex ) ((sib) >> 6)
#define SIB_INDEX( sib, rex ) (((sib) >> 3) & 7) | (((rex) & REX_R) ? 8 : 0)
#define SIB_BASE( sib, rex ) (((sib) & 7) | (((rex) & REX_B) ? 8 : 0))
/* keep in sync with dlls/ntdll/thread.c:thread_init */
static const BYTE *wine_user_shared_data = (BYTE *)0x7ffe0000;
static const BYTE *user_shared_data = (BYTE *)0xfffff78000000000;
static inline DWORD64 *get_int_reg( CONTEXT *context, int index )
{
return &context->Rax + index; /* index should be in range 0 .. 15 */
}
static inline int get_op_size( int long_op, int rex )
{
if (rex & REX_W)
return sizeof(DWORD64);
else if (long_op)
return sizeof(DWORD);
else
return sizeof(WORD);
}
/* store an operand into a register */
static void store_reg_word( CONTEXT *context, BYTE regmodrm, const BYTE *addr, int long_op, int rex )
{
int index = REGMODRM_REG( regmodrm, rex );
BYTE *reg = (BYTE *)get_int_reg( context, index );
memcpy( reg, addr, get_op_size( long_op, rex ) );
}
/* store an operand into a byte register */
static void store_reg_byte( CONTEXT *context, BYTE regmodrm, const BYTE *addr, int rex )
{
int index = REGMODRM_REG( regmodrm, rex );
BYTE *reg = (BYTE *)get_int_reg( context, index );
if (!rex && index >= 4 && index < 8) reg -= (4 * sizeof(DWORD64) - 1); /* special case: ah, ch, dh, bh */
*reg = *addr;
}
/***********************************************************************
* INSTR_GetOperandAddr
*
* Return the address of an instruction operand (from the mod/rm byte).
*/
static BYTE *INSTR_GetOperandAddr( CONTEXT *context, BYTE *instr,
int long_addr, int rex, int segprefix, int *len )
{
int mod, rm, ss = 0, off, have_sib = 0;
DWORD64 base = 0, index = 0;
#define GET_VAL( val, type ) \
{ *val = *(type *)instr; instr += sizeof(type); *len += sizeof(type); }
*len = 0;
GET_VAL( &mod, BYTE );
rm = REGMODRM_RM( mod, rex );
mod = REGMODRM_MOD( mod, rex );
if (mod == 3)
return (BYTE *)get_int_reg( context, rm );
if ((rm & 7) == 4)
{
BYTE sib;
int id;
GET_VAL( &sib, BYTE );
rm = SIB_BASE( sib, rex );
id = SIB_INDEX( sib, rex );
ss = SIB_SS( sib, rex );
index = (id != 4) ? *get_int_reg( context, id ) : 0;
if (!long_addr) index &= 0xffffffff;
have_sib = 1;
}
base = *get_int_reg( context, rm );
if (!long_addr) base &= 0xffffffff;
switch (mod)
{
case 0:
if (rm == 5) /* special case */
{
base = have_sib ? 0 : context->Rip;
if (!long_addr) base &= 0xffffffff;
GET_VAL( &off, DWORD );
base += (signed long)off;
}
break;
case 1: /* 8-bit disp */
GET_VAL( &off, BYTE );
base += (signed char)off;
break;
case 2: /* 32-bit disp */
GET_VAL( &off, DWORD );
base += (signed long)off;
break;
}
/* FIXME: we assume that all segments have a base of 0 */
return (BYTE *)(base + (index << ss));
#undef GET_VAL
}
/***********************************************************************
* emulate_instruction
*
* Emulate a privileged instruction.
* Returns exception continuation status.
*/
static DWORD emulate_instruction( EXCEPTION_RECORD *rec, CONTEXT *context )
{
int prefix, segprefix, prefixlen, len, long_op, long_addr, rex;
BYTE *instr;
long_op = long_addr = 1;
instr = (BYTE *)context->Rip;
if (!instr) return ExceptionContinueSearch;
/* First handle any possible prefix */
segprefix = -1; /* no seg prefix */
rex = 0; /* no rex prefix */
prefix = 1;
prefixlen = 0;
while(prefix)
{
switch(*instr)
{
case 0x2e:
segprefix = context->SegCs;
break;
case 0x36:
segprefix = context->SegSs;
break;
case 0x3e:
segprefix = context->SegDs;
break;
case 0x26:
segprefix = context->SegEs;
break;
case 0x64:
segprefix = context->SegFs;
break;
case 0x65:
segprefix = context->SegGs;
break;
case 0x66:
long_op = !long_op; /* opcode size prefix */
break;
case 0x67:
long_addr = !long_addr; /* addr size prefix */
break;
case 0xf0: /* lock */
break;
case 0xf2: /* repne */
break;
case 0xf3: /* repe */
break;
default:
prefix = 0; /* no more prefixes */
break;
}
if (*instr >= 0x40 && *instr < 0x50) /* rex */
{
rex = *instr;
prefix = TRUE;
}
if (prefix)
{
instr++;
prefixlen++;
}
}
/* Now look at the actual instruction */
switch(*instr)
{
case 0x8a: /* mov Eb, Gb */
case 0x8b: /* mov Ev, Gv */
{
BYTE *data = INSTR_GetOperandAddr( context, instr + 1, long_addr,
rex, segprefix, &len );
unsigned int data_size = (*instr == 0x8b) ? get_op_size( long_op, rex ) : 1;
unsigned int offset = data - user_shared_data;
if (offset <= sizeof(KSHARED_USER_DATA) - data_size)
{
switch (*instr)
{
case 0x8a: store_reg_byte( context, instr[1], wine_user_shared_data + offset, rex ); break;
case 0x8b: store_reg_word( context, instr[1], wine_user_shared_data + offset, long_op, rex ); break;
}
context->Rip += prefixlen + len + 1;
return ExceptionContinueExecution;
}
break; /* Unable to emulate it */
}
}
return ExceptionContinueSearch; /* Unable to emulate it */
}
/***********************************************************************
* vectored_handler
*
* Vectored exception handler used to emulate protected instructions
* from 64-bit code.
*/
LONG CALLBACK vectored_handler( EXCEPTION_POINTERS *ptrs )
{
EXCEPTION_RECORD *record = ptrs->ExceptionRecord;
CONTEXT *context = ptrs->ContextRecord;
if (record->ExceptionCode == EXCEPTION_ACCESS_VIOLATION &&
record->ExceptionInformation[0] == EXCEPTION_READ_FAULT)
{
if (emulate_instruction( record, context ) == ExceptionContinueExecution)
{
TRACE( "next instruction rip=%lx\n", context->Rip );
TRACE( " rax=%016lx rbx=%016lx rcx=%016lx rdx=%016lx\n",
context->Rax, context->Rbx, context->Rcx, context->Rdx );
TRACE( " rsi=%016lx rdi=%016lx rbp=%016lx rsp=%016lx\n",
context->Rsi, context->Rdi, context->Rbp, context->Rsp );
TRACE( " r8=%016lx r9=%016lx r10=%016lx r11=%016lx\n",
context->R8, context->R9, context->R10, context->R11 );
TRACE( " r12=%016lx r13=%016lx r14=%016lx r15=%016lx\n",
context->R12, context->R13, context->R14, context->R15 );
return EXCEPTION_CONTINUE_EXECUTION;
}
}
return EXCEPTION_CONTINUE_SEARCH;
}
#endif /* __x86_64__ */

2
dlls/ntoskrnl.exe/ntoskrnl.c
View File

@ -2069,7 +2069,7 @@ BOOL WINAPI DllMain( HINSTANCE inst, DWORD reason, LPVOID reserved )
{
case DLL_PROCESS_ATTACH:
DisableThreadLibraryCalls( inst );
#ifdef __i386__
#if defined(__i386__) || defined(__x86_64__)
handler = RtlAddVectoredExceptionHandler( TRUE, vectored_handler );
#endif
KeQueryTickCount( &count ); /* initialize the global KeTickCount */