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wow64: Use a .seh handler for system calls.

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This commit is contained in:
Alexandre Julliard 2024-03-22 13:05:25 +01:00
parent b053e924e8
commit d91f16a24a
1 changed files with 62 additions and 23 deletions
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85
dlls/wow64/syscall.c
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@ -298,7 +298,7 @@ static void __attribute__((used)) call_user_exception_dispatcher( EXCEPTION_RECO
/**********************************************************************
* call_raise_user_exception_dispatcher
*/
static void call_raise_user_exception_dispatcher( ULONG code )
static void __attribute__((used)) call_raise_user_exception_dispatcher( ULONG code )
{
TEB32 *teb32 = (TEB32 *)((char *)NtCurrentTeb() + NtCurrentTeb()->WowTebOffset);
@ -927,18 +927,66 @@ static void free_temp_data(void)
/**********************************************************************
* syscall_filter
* wow64_syscall
*/
static LONG CALLBACK syscall_filter( EXCEPTION_POINTERS *ptrs )
{
switch (ptrs->ExceptionRecord->ExceptionCode)
{
case STATUS_INVALID_HANDLE:
call_raise_user_exception_dispatcher( ptrs->ExceptionRecord->ExceptionCode );
break;
}
return EXCEPTION_EXECUTE_HANDLER;
}
#ifdef __aarch64__
NTSTATUS wow64_syscall( UINT *args, ULONG_PTR thunk );
__ASM_GLOBAL_FUNC( wow64_syscall,
"stp x29, x30, [sp, #-16]!\n\t"
".seh_save_fplr_x 16\n\t"
".seh_endprologue\n\t"
".seh_handler wow64_syscall_handler, @except\n"
"blr x1\n\t"
"b 1f\n"
"wow64_syscall_ret:\n\t"
"eor w1, w0, #0xc0000000\n\t"
"cmp w1, #8\n\t" /* STATUS_INVALID_HANDLE */
"b.ne 1f\n\t"
"bl call_raise_user_exception_dispatcher\n"
"1:\tldp x29, x30, [sp], #16\n\t"
"ret" )
__ASM_GLOBAL_FUNC( wow64_syscall_handler,
"stp x29, x30, [sp, #-16]!\n\t"
".seh_save_fplr_x 16\n\t"
".seh_endprologue\n\t"
"ldr w4, [x0, #4]\n\t" /* record->ExceptionFlags */
"tst w4, #6\n\t" /* EXCEPTION_UNWINDING | EXCEPTION_EXIT_UNWIND */
"b.ne 1f\n\t"
"mov x2, x0\n\t" /* record */
"mov x0, x1\n\t" /* frame */
"adr x1, wow64_syscall_ret\n\t" /* target */
"ldr w3, [x2]\n\t" /* retval = record->ExceptionCode */
"bl RtlUnwind\n\t"
"1:\tmov w0, #1\n\t" /* ExceptionContinueSearch */
"ldp x29, x30, [sp], #16\n\t"
"ret" )
#else
NTSTATUS wow64_syscall( UINT *args, ULONG_PTR thunk );
__ASM_GLOBAL_FUNC( wow64_syscall,
"subq $0x28, %rsp\n\t"
".seh_stackalloc 0x28\n\t"
".seh_endprologue\n\t"
".seh_handler wow64_syscall_handler, @except\n\t"
"call *%rdx\n\t"
"jmp 1f\n"
"wow64_syscall_ret:\n\t"
"cmpl $0xc0000008,%eax\n\t" /* STATUS_INVALID_HANDLE */
"jne 1f\n\t"
"movl %eax,%ecx\n\t"
"call call_raise_user_exception_dispatcher\n"
"1:\taddq $0x28, %rsp\n\t"
"ret" )
__ASM_GLOBAL_FUNC( wow64_syscall_handler,
"subq $0x28,%rsp\n\t"
".seh_stackalloc 0x28\n\t"
".seh_endprologue\n\t"
"movl (%rcx),%r9d\n\t" /* retval = rec->ExceptionCode */
"movq %rcx,%r8\n\t" /* rec */
"movq %rdx,%rcx\n\t" /* frame */
"leaq wow64_syscall_ret(%rip),%rdx\n\t"
"call RtlUnwind\n\t"
"int3" )
#endif
/**********************************************************************
@ -950,21 +998,12 @@ NTSTATUS WINAPI Wow64SystemServiceEx( UINT num, UINT *args )
UINT id = num & 0xfff;
const SYSTEM_SERVICE_TABLE *table = &syscall_tables[(num >> 12) & 3];
if (id >= table->ServiceLimit || !table->ServiceTable[id])
if (id >= table->ServiceLimit)
{
ERR( "unsupported syscall %04x\n", num );
return STATUS_INVALID_SYSTEM_SERVICE;
}
__TRY
{
syscall_thunk thunk = (syscall_thunk)table->ServiceTable[id];
status = thunk( args );
}
__EXCEPT( syscall_filter )
{
status = GetExceptionCode();
}
__ENDTRY
status = wow64_syscall( args, table->ServiceTable[id] );
free_temp_data();
return status;
}