winebuild: Set Thumb bit in CPSR register on syscall entry.

dlls/ntdll/tests/exception.c

@@ -4233,7 +4233,8 @@ static void test_thread_context(void)
     COMPARE( R9 );
     COMPARE( R10 );
     COMPARE( R11 );
-    COMPARE( Cpsr );
+    ok( (context.Cpsr & 0xff0f0000) == (expect.Cpsr & 0xff0f0000),
+        "wrong Cpsr %08x/%08x\n", context.Cpsr, expect.Cpsr );
     ok( context.Sp == expect.Sp - 8,
         "wrong Sp %08x/%08x\n", context.Sp, expect.Sp - 8 );
     /* Pc is somewhere close to the NtGetContextThread implementation */

tools/winebuild/import.c

@@ -1611,6 +1611,7 @@ static void output_syscall_dispatcher( int count, const char *variant )
         output( "\tmrc p15, 0, r7, c13, c0, 2\n" ); /* NtCurrentTeb() */
         output( "\tadd r7, #0x1d8\n" );  /* arm_thread_data()->syscall_frame */
         output( "\tmrs ip, CPSR\n" );
+        output( "\tbfi ip, lr, #5, #1\n" );  /* set thumb bit */
         output( "\tstr ip, [sp, #4]\n" );
         output( "\tstr sp, [r7]\n" );  /* syscall frame */
         output( "\tldr r5, 6f+4\n");