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wine/dlls/wow64cpu/cpu.c
Alexandre Julliard 7e680152d4 wow64cpu: Add a custom 32->64 thunk for Unix calls.
2022-12-01 20:36:04 +01:00

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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;
};
struct thunk_opcodes
{
struct thunk_32to64 syscall_thunk;
struct
{
BYTE pushl; /* pushl $dispatcher_high */
DWORD dispatcher_high;
BYTE pushl2; /* pushl $dispatcher_low */
DWORD dispatcher_low;
struct thunk_32to64 t;
} unix_thunk;
};
#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;
}
/***********************************************************************
* fpux_to_fpu
*
* Build a standard i386 FPU context from an extended one.
*/
static void fpux_to_fpu( I386_FLOATING_SAVE_AREA *fpu, const XMM_SAVE_AREA32 *fpux )
{
unsigned int i, tag, stack_top;
fpu->ControlWord = fpux->ControlWord;
fpu->StatusWord = fpux->StatusWord;
fpu->ErrorOffset = fpux->ErrorOffset;
fpu->ErrorSelector = fpux->ErrorSelector | (fpux->ErrorOpcode << 16);
fpu->DataOffset = fpux->DataOffset;
fpu->DataSelector = fpux->DataSelector;
fpu->Cr0NpxState = fpux->StatusWord | 0xffff0000;
stack_top = (fpux->StatusWord >> 11) & 7;
fpu->TagWord = 0xffff0000;
for (i = 0; i < 8; i++)
{
memcpy( &fpu->RegisterArea[10 * i], &fpux->FloatRegisters[i], 10 );
if (!(fpux->TagWord & (1 << i))) tag = 3; /* empty */
else
{
const M128A *reg = &fpux->FloatRegisters[(i - stack_top) & 7];
if ((reg->High & 0x7fff) == 0x7fff) /* exponent all ones */
{
tag = 2; /* special */
}
else if (!(reg->High & 0x7fff)) /* exponent all zeroes */
{
if (reg->Low) tag = 2; /* special */
else tag = 1; /* zero */
}
else
{
if (reg->Low >> 63) tag = 0; /* valid */
else tag = 2; /* special */
}
}
fpu->TagWord |= tag << (2 * i);
}
}
/**********************************************************************
* 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;
}
if (flags & CONTEXT_I386_FLOATING_POINT)
{
fpux_to_fpu( &ctx32->FloatSave, &ctx64->FltSave );
}
if (flags & CONTEXT_I386_EXTENDED_REGISTERS)
{
*(XSAVE_FORMAT *)ctx32->ExtendedRegisters = ctx64->FltSave;
}
/* FIXME: 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 .Lsyscall_32to64_return\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"
".Lsyscall_32to64_return:\n\t"
"movq %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" )
/**********************************************************************
* unix_call_32to64
*
* Execute a 64-bit Unix call from 32-bit code, then return to 32-bit.
*/
extern void WINAPI unix_call_32to64(void) DECLSPEC_HIDDEN;
__ASM_GLOBAL_FUNC( unix_call_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 8(%r14),%edx\n\t"
"movl %edx,0xb8(%r13)\n\t" /* context->Eip */
"leaq 28(%r14),%rdx\n\t"
"movl %edx,0xc4(%r13)\n\t" /* context->Esp */
"movq 12(%r14),%rcx\n\t" /* handle */
"movl 20(%r14),%edx\n\t" /* code */
"movl 24(%r14),%r8d\n\t" /* args */
"callq *(%r14)\n\t"
"btrl $0,-4(%r13)\n\t" /* cpu->Flags & WOW64_CPURESERVED_FLAG_RESET_STATE */
"jc .Lsyscall_32to64_return\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)" )
/**********************************************************************
* 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_opcodes *thunk = (struct thunk_opcodes *)code_buffer;
SIZE_T size = sizeof(*thunk);
ULONG old_prot;
CONTEXT context;
HMODULE module;
UNICODE_STRING str;
void **p__wine_unix_call_dispatcher;
if ((ULONG_PTR)syscall_32to64 >> 32)
{
ERR( "wow64cpu loaded above 4G, disabling\n" );
return STATUS_INVALID_ADDRESS;
}
RtlInitUnicodeString( &str, L"ntdll.dll" );
LdrGetDllHandle( NULL, 0, &str, &module );
p__wine_unix_call_dispatcher = RtlFindExportedRoutineByName( module, "__wine_unix_call_dispatcher" );
RtlCaptureContext( &context );
cs64_sel = context.SegCs;
ds64_sel = context.SegDs;
fs32_sel = context.SegFs;
thunk->syscall_thunk.ljmp = 0xff;
thunk->syscall_thunk.modrm = 0x2d;
thunk->syscall_thunk.op = PtrToUlong( &thunk->syscall_thunk.addr );
thunk->syscall_thunk.addr = PtrToUlong( syscall_32to64 );
thunk->syscall_thunk.cs = cs64_sel;
thunk->unix_thunk.pushl = 0x68;
thunk->unix_thunk.dispatcher_high = (ULONG_PTR)*p__wine_unix_call_dispatcher >> 32;
thunk->unix_thunk.pushl2 = 0x68;
thunk->unix_thunk.dispatcher_low = (ULONG_PTR)*p__wine_unix_call_dispatcher;
thunk->unix_thunk.t.ljmp = 0xff;
thunk->unix_thunk.t.modrm = 0x2d;
thunk->unix_thunk.t.op = PtrToUlong( &thunk->unix_thunk.t.addr );
thunk->unix_thunk.t.addr = PtrToUlong( unix_call_32to64 );
thunk->unix_thunk.t.cs = cs64_sel;
NtProtectVirtualMemory( GetCurrentProcess(), (void **)&thunk, &size, PAGE_EXECUTE_READ, &old_prot );
return STATUS_SUCCESS;
}
/**********************************************************************
* BTCpuGetBopCode (wow64cpu.@)
*/
void * WINAPI BTCpuGetBopCode(void)
{
struct thunk_opcodes *thunk = (struct thunk_opcodes *)code_buffer;
return &thunk->syscall_thunk;
}
/**********************************************************************
* __wine_get_unix_opcode (wow64cpu.@)
*/
void * WINAPI __wine_get_unix_opcode(void)
{
struct thunk_opcodes *thunk = (struct thunk_opcodes *)code_buffer;
return &thunk->unix_thunk;
}
/**********************************************************************
* 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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