ntdll: Restore FP status words from MSVCRT_JUMP_BUFFER on x64.

dlls/ntdll/signal_x86_64.c

@@ -64,7 +64,9 @@ struct MSVCRT_JUMP_BUFFER
     ULONG64 R14;
     ULONG64 R15;
     ULONG64 Rip;
-    ULONG64 Spare;
+    ULONG  MxCsr;
+    USHORT FpCsr;
+    USHORT Spare;
     M128A   Xmm6;
     M128A   Xmm7;
     M128A   Xmm8;
@@ -1218,6 +1220,9 @@ void CDECL RtlRestoreContext( CONTEXT *context, EXCEPTION_RECORD *rec )
         context->u.s.Xmm13 = jmp->Xmm13;
         context->u.s.Xmm14 = jmp->Xmm14;
         context->u.s.Xmm15 = jmp->Xmm15;
+        context->MxCsr     = jmp->MxCsr;
+        context->u.FltSave.MxCsr = jmp->MxCsr;
+        context->u.FltSave.ControlWord = jmp->FpCsr;
     }
     else if (rec && rec->ExceptionCode == STATUS_UNWIND_CONSOLIDATE && rec->NumberParameters >= 1)
     {

dlls/ntdll/tests/exception.c

@@ -2460,6 +2460,10 @@ static void test_restore_context(void)
         rec.NumberParameters = 1;
         rec.ExceptionInformation[0] = (DWORD64)&buf;
 
+        ok(buf.MxCsr == 0x1f80, "Got unexpected MxCsr %#x.\n", buf.MxCsr);
+        ok(buf.FpCsr == 0x27f, "Got unexpected FpCsr %#x.\n", buf.FpCsr);
+        buf.FpCsr = 0x7f;
+        buf.MxCsr = 0x3f80;
         /* uses buf.Rip instead of ctx.Rip */
         pRtlRestoreContext(&ctx, &rec);
         ok(0, "shouldn't be reached\n");
@@ -2487,6 +2491,18 @@ static void test_restore_context(void)
                 "longjmp failed for Xmm%d, expected %lx, got %lx\n", i + 6,
                 fltsave[i].Part[1], ctx.FltSave.XmmRegisters[i + 6].High);
         }
+        ok(ctx.FltSave.ControlWord == 0x7f, "Got unexpected float control word %#x.\n", ctx.FltSave.ControlWord);
+        ok(ctx.MxCsr == 0x3f80, "Got unexpected MxCsr %#x.\n", ctx.MxCsr);
+        ok(ctx.FltSave.MxCsr == 0x3f80, "Got unexpected MxCsr %#x.\n", ctx.FltSave.MxCsr);
+        buf.FpCsr = 0x27f;
+        buf.MxCsr = 0x1f80;
+        pRtlRestoreContext(&ctx, &rec);
+        ok(0, "shouldn't be reached\n");
+    }
+    else if (pass == 5)
+    {
+        ok(ctx.FltSave.ControlWord == 0x27f, "Got unexpected float control word %#x.\n", ctx.FltSave.ControlWord);
+        ok(ctx.FltSave.MxCsr == 0x1f80, "Got unexpected MxCsr %#x.\n", ctx.MxCsr);
     }
     else
         ok(0, "unexpected pass %d\n", pass);