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Sweden-Number/dlls/wow64cpu/cpu.c

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/*
* WoW64 CPU support
*
* Copyright 2021 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdarg.h>
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winnt.h"
#include "winternl.h"
#include "wine/asm.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(wow);
#include "pshpack1.h"
struct thunk_32to64
{
BYTE ljmp; /* jump far, absolute indirect */
BYTE modrm; /* address=disp32, opcode=5 */
DWORD op;
DWORD addr;
WORD cs;
};
#include "poppack.h"
static BYTE DECLSPEC_ALIGN(4096) code_buffer[0x1000];
static USHORT cs64_sel;
static USHORT ds64_sel;
static USHORT fs32_sel;
BOOL WINAPI DllMain( HINSTANCE inst, DWORD reason, void *reserved )
{
if (reason == DLL_PROCESS_ATTACH) LdrDisableThreadCalloutsForDll( inst );
return TRUE;
}
/**********************************************************************
* copy_context_64to32
*
* Copy a 64-bit context corresponding to an exception happening in 32-bit mode
* into the corresponding 32-bit context.
*/
static void copy_context_64to32( I386_CONTEXT *ctx32, DWORD flags, AMD64_CONTEXT *ctx64 )
{
ctx32->ContextFlags = flags;
flags &= ~CONTEXT_i386;
if (flags & CONTEXT_I386_INTEGER)
{
ctx32->Eax = ctx64->Rax;
ctx32->Ebx = ctx64->Rbx;
ctx32->Ecx = ctx64->Rcx;
ctx32->Edx = ctx64->Rdx;
ctx32->Esi = ctx64->Rsi;
ctx32->Edi = ctx64->Rdi;
}
if (flags & CONTEXT_I386_CONTROL)
{
ctx32->Esp = ctx64->Rsp;
ctx32->Ebp = ctx64->Rbp;
ctx32->Eip = ctx64->Rip;
ctx32->EFlags = ctx64->EFlags;
ctx32->SegCs = ctx64->SegCs;
ctx32->SegSs = ds64_sel;
}
if (flags & CONTEXT_I386_SEGMENTS)
{
ctx32->SegDs = ds64_sel;
ctx32->SegEs = ds64_sel;
ctx32->SegFs = fs32_sel;
ctx32->SegGs = ds64_sel;
}
if (flags & CONTEXT_I386_DEBUG_REGISTERS)
{
ctx32->Dr0 = ctx64->Dr0;
ctx32->Dr1 = ctx64->Dr1;
ctx32->Dr2 = ctx64->Dr2;
ctx32->Dr3 = ctx64->Dr3;
ctx32->Dr6 = ctx64->Dr6;
ctx32->Dr7 = ctx64->Dr7;
}
/* FIXME: floating point + xstate */
}
/**********************************************************************
* syscall_32to64
*
* Execute a 64-bit syscall from 32-bit code, then return to 32-bit.
*/
extern void WINAPI syscall_32to64(void) DECLSPEC_HIDDEN;
__ASM_GLOBAL_FUNC( syscall_32to64,
/* cf. BTCpuSimulate prolog */
__ASM_SEH(".seh_stackalloc 0x28\n\t")
__ASM_SEH(".seh_endprologue\n\t")
__ASM_CFI(".cfi_adjust_cfa_offset 0x28\n\t")
"xchgq %r14,%rsp\n\t"
"movl %edi,0x9c(%r13)\n\t" /* context->Edi */
"movl %esi,0xa0(%r13)\n\t" /* context->Esi */
"movl %ebx,0xa4(%r13)\n\t" /* context->Ebx */
"movl %ebp,0xb4(%r13)\n\t" /* context->Ebp */
"movl (%r14),%edx\n\t"
"movl %edx,0xb8(%r13)\n\t" /* context->Eip */
"pushfq\n\t"
"popq %rdx\n\t"
"movl %edx,0xc0(%r13)\n\t" /* context->EFlags */
"leaq 4(%r14),%rdx\n\t"
"movl %edx,0xc4(%r13)\n\t" /* context->Esp */
"movq %rax,%rcx\n\t" /* syscall number */
"leaq 8(%r14),%rdx\n\t" /* parameters */
"call " __ASM_NAME("Wow64SystemServiceEx") "\n\t"
"syscall_32to64_return:\n\t"
"movl 0x9c(%r13),%edi\n\t" /* context->Edi */
"movl 0xa0(%r13),%esi\n\t" /* context->Esi */
"movl 0xa4(%r13),%ebx\n\t" /* context->Ebx */
"movl 0xb4(%r13),%ebp\n\t" /* context->Ebp */
"btrl $0,-4(%r13)\n\t" /* cpu->Flags & WOW64_CPURESERVED_FLAG_RESET_STATE */
"jc 1f\n\t"
"movl 0xb8(%r13),%edx\n\t" /* context->Eip */
"movl %edx,(%rsp)\n\t"
"movl 0xbc(%r13),%edx\n\t" /* context->SegCs */
"movl %edx,4(%rsp)\n\t"
"movl 0xc4(%r13),%r14d\n\t" /* context->Esp */
"xchgq %r14,%rsp\n\t"
"ljmp *(%r14)\n"
"1:\tmovq %rsp,%r14\n\t"
"movl 0xa8(%r13),%edx\n\t" /* context->Edx */
"movl 0xac(%r13),%ecx\n\t" /* context->Ecx */
"movl 0xc8(%r13),%eax\n\t" /* context->SegSs */
"movq %rax,0x20(%rsp)\n\t"
"mov %ax,%ds\n\t"
"mov %ax,%es\n\t"
"mov 0x90(%r13),%fs\n\t" /* context->SegFs */
"movl 0xc4(%r13),%eax\n\t" /* context->Esp */
"movq %rax,0x18(%rsp)\n\t"
"movl 0xc0(%r13),%eax\n\t" /* context->EFlags */
"movq %rax,0x10(%rsp)\n\t"
"movl 0xbc(%r13),%eax\n\t" /* context->SegCs */
"movq %rax,0x8(%rsp)\n\t"
"movl 0xb8(%r13),%eax\n\t" /* context->Eip */
"movq %rax,(%rsp)\n\t"
"movl 0xb0(%r13),%eax\n\t" /* context->Eax */
"iretq" )
/**********************************************************************
* BTCpuSimulate (wow64cpu.@)
*/
__ASM_STDCALL_FUNC( BTCpuSimulate, 0,
"subq $0x28,%rsp\n"
__ASM_SEH(".seh_stackalloc 0x28\n\t")
__ASM_SEH(".seh_endprologue\n\t")
__ASM_CFI(".cfi_adjust_cfa_offset 0x28\n\t")
"movq %gs:0x30,%r12\n\t"
"movq 0x1488(%r12),%rcx\n\t" /* NtCurrentTeb()->TlsSlots[WOW64_TLS_CPURESERVED] */
"leaq 4(%rcx),%r13\n" /* cpu->Context */
"jmp syscall_32to64_return\n" )
/**********************************************************************
* BTCpuProcessInit (wow64cpu.@)
*/
NTSTATUS WINAPI BTCpuProcessInit(void)
{
struct thunk_32to64 *thunk = (struct thunk_32to64 *)code_buffer;
SIZE_T size = sizeof(*thunk);
ULONG old_prot;
CONTEXT context;
if ((ULONG_PTR)syscall_32to64 >> 32)
{
ERR( "wow64cpu loaded above 4G, disabling\n" );
return STATUS_INVALID_ADDRESS;
}
RtlCaptureContext( &context );
cs64_sel = context.SegCs;
ds64_sel = context.SegDs;
fs32_sel = context.SegFs;
thunk->ljmp = 0xff;
thunk->modrm = 0x2d;
thunk->op = PtrToUlong( &thunk->addr );
thunk->addr = PtrToUlong( syscall_32to64 );
thunk->cs = cs64_sel;
NtProtectVirtualMemory( GetCurrentProcess(), (void **)&thunk, &size, PAGE_EXECUTE_READ, &old_prot );
return STATUS_SUCCESS;
}
/**********************************************************************
* BTCpuGetBopCode (wow64cpu.@)
*/
void * WINAPI BTCpuGetBopCode(void)
{
return code_buffer;
}
/**********************************************************************
* BTCpuGetContext (wow64cpu.@)
*/
NTSTATUS WINAPI BTCpuGetContext( HANDLE thread, HANDLE process, void *unknown, I386_CONTEXT *ctx )
{
return NtQueryInformationThread( thread, ThreadWow64Context, ctx, sizeof(*ctx), NULL );
}
/**********************************************************************
* BTCpuSetContext (wow64cpu.@)
*/
NTSTATUS WINAPI BTCpuSetContext( HANDLE thread, HANDLE process, void *unknown, I386_CONTEXT *ctx )
{
return NtSetInformationThread( thread, ThreadWow64Context, ctx, sizeof(*ctx) );
}
/**********************************************************************
* BTCpuResetToConsistentState (wow64cpu.@)
*/
NTSTATUS WINAPI BTCpuResetToConsistentState( EXCEPTION_POINTERS *ptrs )
{
CONTEXT *context = ptrs->ContextRecord;
I386_CONTEXT wow_context;
copy_context_64to32( &wow_context, CONTEXT_I386_ALL, context );
wow_context.EFlags &= ~(0x100|0x40000);
BTCpuSetContext( GetCurrentThread(), GetCurrentProcess(), NULL, &wow_context );
/* fixup context to pretend that we jumped to 64-bit mode */
context->Rip = (ULONG64)syscall_32to64;
context->SegCs = cs64_sel;
context->Rsp = context->R14;
return STATUS_SUCCESS;
}
/**********************************************************************
* BTCpuTurboThunkControl (wow64cpu.@)
*/
NTSTATUS WINAPI BTCpuTurboThunkControl( ULONG enable )
{
if (enable) return STATUS_NOT_SUPPORTED;
/* we don't have turbo thunks yet */
return STATUS_SUCCESS;
}
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