wow64cpu: Implement 32<->64 bit code switching.
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
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Alexandre Julliard
parent
3dd6cafe3d
commit
f60fd0e9ae
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@ -1 +1,6 @@
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MODULE = wow64cpu.dll
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IMPORTS = wow64 ntdll winecrt0
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EXTRADLLFLAGS = -nodefaultlibs -mno-cygwin -Wl,--image-base,0x6f100000
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C_SRCS = cpu.c
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@ -0,0 +1,139 @@
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/*
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* WoW64 CPU support
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*
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* Copyright 2021 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <stdarg.h>
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#include "ntstatus.h"
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#define WIN32_NO_STATUS
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#include "windef.h"
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#include "winnt.h"
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#include "winternl.h"
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#include "wine/asm.h"
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#include "wine/exception.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(wow);
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#include "pshpack1.h"
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struct thunk_32to64
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{
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BYTE ljmp; /* ljmp %cs:1f */
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DWORD addr;
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WORD cs;
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};
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#include "poppack.h"
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static BYTE DECLSPEC_ALIGN(4096) code_buffer[0x1000];
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BOOL WINAPI DllMain( HINSTANCE inst, DWORD reason, void *reserved )
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{
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if (reason == DLL_PROCESS_ATTACH) LdrDisableThreadCalloutsForDll( inst );
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return TRUE;
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}
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/**********************************************************************
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* syscall_32to64
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*
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* Execute a 64-bit syscall from 32-bit code, then return to 32-bit.
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*/
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extern void WINAPI syscall_32to64(void) DECLSPEC_HIDDEN;
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__ASM_GLOBAL_FUNC( syscall_32to64,
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/* cf. BTCpuSimulate prolog */
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__ASM_SEH(".seh_stackalloc 0x28\n\t")
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__ASM_SEH(".seh_endprologue\n\t")
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__ASM_CFI(".cfi_adjust_cfa_offset 0x28\n\t")
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"xchgq %r14,%rsp\n\t"
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"movl %edi,0x9c(%r13)\n\t" /* context->Edi */
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"movl %esi,0xa0(%r13)\n\t" /* context->Esi */
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"movl %ebx,0xa4(%r13)\n\t" /* context->Ebx */
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"movl %ebp,0xb4(%r13)\n\t" /* context->Ebp */
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"movl (%r14),%edx\n\t"
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"movl %edx,0xb8(%r13)\n\t" /* context->Eip */
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"pushfq\n\t"
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"popq %rdx\n\t"
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"movl %edx,0xc0(%r13)\n\t" /* context->EFlags */
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"leaq 4(%r14),%rdx\n\t"
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"movl %edx,0xc4(%r13)\n\t" /* context->Esp */
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"movq %rax,%rcx\n\t" /* syscall number */
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"leaq 8(%r14),%rdx\n\t" /* parameters */
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"call " __ASM_NAME("Wow64SystemServiceEx") "\n\t"
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"syscall_32to64_return:\n\t"
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"movl 0x9c(%r13),%edi\n\t" /* context->Edi */
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"movl 0xa0(%r13),%esi\n\t" /* context->Esi */
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"movl 0xa4(%r13),%ebx\n\t" /* context->Ebx */
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"movl 0xb4(%r13),%ebp\n\t" /* context->Ebp */
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"movl 0xb8(%r13),%edx\n\t" /* context->Eip */
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"movl %edx,(%rsp)\n\t"
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"movl 0xbc(%r13),%edx\n\t" /* context->SegCs */
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"movl %edx,4(%rsp)\n\t"
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"movl 0xc4(%r13),%r14d\n\t" /* context->Esp */
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"xchgq %r14,%rsp\n\t"
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"ljmp *(%r14)" )
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/**********************************************************************
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* BTCpuSimulate (wow64cpu.@)
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*/
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__ASM_STDCALL_FUNC( BTCpuSimulate, 0,
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"subq $0x28,%rsp\n"
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__ASM_SEH(".seh_stackalloc 0x28\n\t")
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__ASM_SEH(".seh_endprologue\n\t")
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__ASM_CFI(".cfi_adjust_cfa_offset 0x28\n\t")
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"movq %gs:0x30,%r12\n\t"
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"movq 0x1488(%r12),%rcx\n\t" /* NtCurrentTeb()->TlsSlots[WOW64_TLS_CPURESERVED] */
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"leaq 4(%rcx),%r13\n" /* cpu->Context */
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"jmp syscall_32to64_return\n" )
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/**********************************************************************
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* BTCpuProcessInit (wow64cpu.@)
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*/
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NTSTATUS WINAPI BTCpuProcessInit(void)
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{
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struct thunk_32to64 *thunk = (struct thunk_32to64 *)code_buffer;
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SIZE_T size = sizeof(*thunk);
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ULONG old_prot;
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CONTEXT context;
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if ((ULONG_PTR)syscall_32to64 >> 32)
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{
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ERR( "wow64cpu loaded above 4G, disabling\n" );
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return STATUS_INVALID_ADDRESS;
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}
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RtlCaptureContext( &context );
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thunk->ljmp = 0xea;
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thunk->addr = PtrToUlong( syscall_32to64 );
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thunk->cs = context.SegCs;
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NtProtectVirtualMemory( GetCurrentProcess(), (void **)&thunk, &size, PAGE_EXECUTE_READ, &old_prot );
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return STATUS_SUCCESS;
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}
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/**********************************************************************
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* BTCpuGetBopCode (wow64cpu.@)
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*/
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void * WINAPI BTCpuGetBopCode(void)
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{
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return code_buffer;
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}
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@ -1,9 +1,9 @@
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@ stub BTCpuGetBopCode
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@ stub BTCpuGetContext
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@ stub BTCpuProcessInit
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@ stub BTCpuResetToConsistentState
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@ stub BTCpuSetContext
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@ stub BTCpuSimulate
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@ stub BTCpuTurboThunkControl
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@ stub TurboDispatchJumpAddressEnd
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@ stub TurboDispatchJumpAddressStart
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@ stdcall BTCpuGetBopCode()
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#@ stub BTCpuGetContext
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@ stdcall BTCpuProcessInit()
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#@ stub BTCpuResetToConsistentState
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#@ stub BTCpuSetContext
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@ stdcall BTCpuSimulate()
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#@ stub BTCpuTurboThunkControl
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#@ stub TurboDispatchJumpAddressEnd
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#@ stub TurboDispatchJumpAddressStart
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