[PATCH 1/2] ntdll/tests: Add test for preserving x87 fpu state when capturing context.

[Paul Gofman]

Signed-off-by: Paul Gofman 
---
 dlls/ntdll/tests/exception.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/dlls/ntdll/tests/exception.c b/dlls/ntdll/tests/exception.c
index b8bd186632..5d108bade1 100644
--- a/dlls/ntdll/tests/exception.c
+++ b/dlls/ntdll/tests/exception.c
@@ -1509,7 +1509,8 @@ static void test_thread_context(void)
     struct expected
     {
         DWORD Eax, Ebx, Ecx, Edx, Esi, Edi, Ebp, Esp, Eip,
-            SegCs, SegDs, SegEs, SegFs, SegGs, SegSs, EFlags, prev_frame;
+            SegCs, SegDs, SegEs, SegFs, SegGs, SegSs, EFlags, prev_frame,
+            x87_control, save_x87_control, new_x87_control;
     } expect;
     NTSTATUS (*func_ptr)( struct expected *res, void *func, void *arg1, void *arg2 ) = (void *)code_mem;

@@ -1542,10 +1543,23 @@ static void test_thread_context(void)
         0x8f, 0x40, 0x3c, /* popl   0x3c(%eax) */
         0xff, 0x75, 0x00, /* pushl  0x0(%ebp) ; previous stack frame */
         0x8f, 0x40, 0x40, /* popl   0x40(%eax) */
+
+        0x9b, 0xd9, 0x78, 0x48,       /* fstcw 0x48(%eax) */
+        0x68, 0x7f, 0x04, 0x00, 0x00, /* pushl $0x47f */
+        0x8f, 0x40, 0x44,             /* popl  0x44(%eax) */
+        0xd9, 0x68, 0x44,             /* fldcw 0x44(%eax); */
+
         0x8b, 0x00,       /* mov    (%eax),%eax */
         0xff, 0x75, 0x14, /* pushl  0x14(%ebp) */
         0xff, 0x75, 0x10, /* pushl  0x10(%ebp) */
         0xff, 0x55, 0x0c, /* call   *0xc(%ebp) */
+
+        0x50,                   /* pushl %eax */
+        0x8b, 0x45, 0x08,       /* mov   0x8(%ebp),%eax */
+        0x9b, 0xd9, 0x78, 0x4c, /* fstcw 0x4c(%eax) */
+        0xd9, 0x68, 0x48,       /* fldcw 0x48(%eax); */
+        0x58,                   /* popl  %eax */
+
         0xc9,             /* leave */
         0xc3,             /* ret */
     };
@@ -1593,7 +1607,8 @@ static void test_thread_context(void)

memset( &context, 0xcc, sizeof(context) );
     memset( &expect, 0xcc, sizeof(expect) );
-    context.ContextFlags = CONTEXT_CONTROL | CONTEXT_INTEGER | CONTEXT_SEGMENTS;
+    context.ContextFlags = CONTEXT_CONTROL | CONTEXT_INTEGER | CONTEXT_SEGMENTS | CONTEXT_FLOATING_POINT;
+
     status = func_ptr( &expect, pNtGetContextThread, (void *)GetCurrentThread(), &context );
     ok( status == STATUS_SUCCESS, "NtGetContextThread failed %08x\n", status );
     trace( "expect: eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x ebp=%08x esp=%08x "
@@ -1625,6 +1640,13 @@ static void test_thread_context(void)
     ok( context.SegFs == LOWORD(expect.SegFs), "wrong SegFs %08x/%08x\n", context.SegFs, expect.SegFs );
     ok( context.SegGs == LOWORD(expect.SegGs), "wrong SegGs %08x/%08x\n", context.SegGs, expect.SegGs );
     ok( context.SegSs == LOWORD(expect.SegSs), "wrong SegSs %08x/%08x\n", context.SegSs, expect.SegGs );
+
+    ok( LOWORD(context.FloatSave.ControlWord) == LOWORD(expect.x87_control),
+            "wrong x87 control word %#x/%#x.\n", context.FloatSave.ControlWord, expect.x87_control );
+    todo_wine ok( LOWORD(expect.x87_control) == LOWORD(expect.new_x87_control),
+            "x87 control word changed in NtGetContextThread() %#x/%#x.\n",
+            LOWORD(expect.x87_control), LOWORD(expect.new_x87_control) );
+
 #undef COMPARE
 }