Changeset 57276 in vbox for trunk/src/VBox/Runtime/r0drv/linux/threadctxhooks-r0drv-linux.c

Timestamp:

Aug 11, 2015 2:39:19 PM (9 years ago)

Author:

vboxsync

Message:

iprt/r0drv/linux: Preserve EFLAGS/AC where ever it may possibly be thought to change when calling kernel code.

File:

• trunk/src/VBox/Runtime/r0drv/linux/threadctxhooks-r0drv-linux.c (modified) (8 diffs)

trunk/src/VBox/Runtime/r0drv/linux/threadctxhooks-r0drv-linux.c

@@ -167 +167 @@
 RTDECL(int) RTThreadCtxHookCreate(PRTTHREADCTXHOOK phCtxHook, uint32_t fFlags, PFNRTTHREADCTXHOOK pfnCallback, void *pvUser)
 {
+    IPRT_LINUX_SAVE_EFL_AC();
+
     /*
      * Validate input.
@@ -181 +183 @@
     pThis = (PRTTHREADCTXHOOKINT)RTMemAllocZ(sizeof(*pThis));
     if (RT_UNLIKELY(!pThis))
+    {
+        IPRT_LINUX_RESTORE_EFL_AC();
         return VERR_NO_MEMORY;
+    }
     pThis->u32Magic     = RTTHREADCTXHOOKINT_MAGIC;
     pThis->hOwner       = RTThreadNativeSelf();
@@ -196 +201 @@
 
     *phCtxHook = pThis;
+    IPRT_LINUX_RESTORE_EFL_AC();
     return VINF_SUCCESS;
 }
@@ -203 +209 @@
 RTDECL(int ) RTThreadCtxHookDestroy(RTTHREADCTXHOOK hCtxHook)
 {
+    IPRT_LINUX_SAVE_EFL_AC();
+
     /*
      * Validate input.
@@ -232 +240 @@
     RTMemFree(pThis);
 
+    IPRT_LINUX_RESTORE_EFL_AC();
     return VINF_SUCCESS;
 }
@@ -250 +259 @@
     if (!pThis->fEnabled)
     {
+        IPRT_LINUX_SAVE_EFL_AC();
         Assert(pThis->PreemptOps.sched_out == rtThreadCtxHooksLnxSchedOut);
         Assert(pThis->PreemptOps.sched_in == rtThreadCtxHooksLnxSchedIn);
@@ -260 +270 @@
         preempt_notifier_register(&pThis->LnxPreemptNotifier);
         preempt_enable();
+
+        IPRT_LINUX_RESTORE_EFL_AC();
     }
 
@@ -284 +296 @@
          */
         if (pThis->fEnabled)
+        {
+            IPRT_LINUX_SAVE_EFL_AC();
             rtThreadCtxHookDisable(pThis);
+            IPRT_LINUX_RESTORE_EFL_AC();
+        }
     }
     return VINF_SUCCESS;