[reactos] 06/07: [RTL] Simplify RtlRaiseException

[Timo Kreuzer]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=e6af7d9dfef7426e687fb8...

commit e6af7d9dfef7426e687fb8436d630f0ecda3856b
Author:     Timo Kreuzer [e-mail]
AuthorDate: Fri Mar 2 07:48:34 2018 +0100
Commit:     Timo Kreuzer [e-mail]
CommitDate: Sat Jun 5 13:52:42 2021 +0200

[RTL] Simplify RtlRaiseException
---
 sdk/lib/rtl/amd64/except.c | 64 ++++++++++++++++------------------------------
 1 file changed, 22 insertions(+), 42 deletions(-)

diff --git a/sdk/lib/rtl/amd64/except.c b/sdk/lib/rtl/amd64/except.c
index d93d77816e0..aebd525774b 100644
--- a/sdk/lib/rtl/amd64/except.c
+++ b/sdk/lib/rtl/amd64/except.c
@@ -19,57 +19,37 @@ RtlRaiseException(IN PEXCEPTION_RECORD ExceptionRecord)
 {
     CONTEXT Context;
     NTSTATUS Status = STATUS_INVALID_DISPOSITION;
-    ULONG64 ImageBase;
-    PRUNTIME_FUNCTION FunctionEntry;
-    PVOID HandlerData;
-    ULONG64 EstablisherFrame;

-    /* Capture the context */
+    /* Capture the current context */
     RtlCaptureContext(&Context);

-    /* Get the function entry for this function */
-    FunctionEntry = RtlLookupFunctionEntry(Context.Rip,
-                                           &ImageBase,
-                                           NULL);
+    /* Fix up Context.Rip for the caller */
+    Context.Rip = (ULONG64)_ReturnAddress();

-    /* Check if we found it */
-    if (FunctionEntry)
+    /* Fix up Context.Rsp for the caller */
+    Context.Rsp = (ULONG64)_AddressOfReturnAddress() + 8;
+
+    /* Save the exception address */
+    ExceptionRecord->ExceptionAddress = (PVOID)Context.Rip;
+
+    /* Check if user mode debugger is active */
+    if (RtlpCheckForActiveDebugger())
+    {
+        /* Raise an exception immediately */
+        Status = ZwRaiseException(ExceptionRecord, &Context, TRUE);
+    }
+    else
     {
-        /* Unwind to the caller of this function */
-        RtlVirtualUnwind(UNW_FLAG_NHANDLER,
-                         ImageBase,
-                         Context.Rip,
-                         FunctionEntry,
-                         &Context,
-                         &HandlerData,
-                         &EstablisherFrame,
-                         NULL);
-
-        /* Save the exception address */
-        ExceptionRecord->ExceptionAddress = (PVOID)Context.Rip;
-
-        /* Write the context flag */
-        Context.ContextFlags = CONTEXT_FULL;
-
-        /* Check if user mode debugger is active */
-        if (RtlpCheckForActiveDebugger())
+        /* Dispatch the exception and check if we should continue */
+        if (!RtlDispatchException(ExceptionRecord, &Context))
         {
-            /* Raise an exception immediately */
-            Status = ZwRaiseException(ExceptionRecord, &Context, TRUE);
+            /* Raise the exception */
+            Status = ZwRaiseException(ExceptionRecord, &Context, FALSE);
         }
         else
         {
-            /* Dispatch the exception and check if we should continue */
-            if (!RtlDispatchException(ExceptionRecord, &Context))
-            {
-                /* Raise the exception */
-                Status = ZwRaiseException(ExceptionRecord, &Context, FALSE);
-            }
-            else
-            {
-                /* Continue, go back to previous context */
-                Status = ZwContinue(&Context, FALSE);
-            }
+            /* Continue, go back to previous context */
+            Status = ZwContinue(&Context, FALSE);
         }
     }