Jacek Caban : ntdll: Handle single step exception in setup_raise_exception on x86_64.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: b76df7fa6de72b7a5a2461436e4c4d191bbd8fc8
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=b76df7fa6de72b7a5a2461436...

Author: Jacek Caban 
Date:   Wed Sep  4 12:45:56 2019 +0200

ntdll: Handle single step exception in setup_raise_exception on x86_64.

Signed-off-by: Jacek Caban 
Signed-off-by: Alexandre Julliard

---

dlls/ntdll/signal_x86_64.c | 50 ++++++++++++++++++----------------------------
 1 file changed, 19 insertions(+), 31 deletions(-)

diff --git a/dlls/ntdll/signal_x86_64.c b/dlls/ntdll/signal_x86_64.c
index 39a13be..dc3091d 100644
--- a/dlls/ntdll/signal_x86_64.c
+++ b/dlls/ntdll/signal_x86_64.c
@@ -2681,36 +2681,6 @@ static void raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )

/**********************************************************************
- *		raise_trap_exception
- */
-static void raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
-{
-    NTSTATUS status;
-
-    if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
-    {
-        /* when single stepping can't tell whether this is a hw bp or a
-         * single step interrupt. try to avoid as much overhead as possible
-         * and only do a server call if there is any hw bp enabled. */
-
-        if( !(context->EFlags & 0x100) || (amd64_thread_data()->dr7 & 0xff) )
-        {
-            /* (possible) hardware breakpoint, fetch the debug registers */
-            DWORD saved_flags = context->ContextFlags;
-            context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
-            NtGetContextThread(GetCurrentThread(), context);
-            context->ContextFlags |= saved_flags;  /* restore flags */
-        }
-
-        context->EFlags &= ~0x100;  /* clear single-step flag */
-    }
-
-    status = NtRaiseException( rec, context, TRUE );
-    raise_status( status, rec );
-}
-
-
-/**********************************************************************
  *		raise_generic_exception
  *
  * Generic raise function for exceptions that don't need special treatment.
@@ -2827,6 +2797,24 @@ static void setup_raise_exception( ucontext_t *sigcontext, EXCEPTION_RECORD *rec
     struct stack_layout *stack = CONTAINING_RECORD( rec, struct stack_layout, rec );
     ULONG64 *rsp_ptr;

+    if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
+    {
+        /* when single stepping can't tell whether this is a hw bp or a
+         * single step interrupt. try to avoid as much overhead as possible
+         * and only do a server call if there is any hw bp enabled. */
+
+        if( !(stack->context.EFlags & 0x100) || (amd64_thread_data()->dr7 & 0xff) )
+        {
+            /* (possible) hardware breakpoint, fetch the debug registers */
+            DWORD saved_flags = stack->context.ContextFlags;
+            stack->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
+            NtGetContextThread(GetCurrentThread(), &stack->context);
+            stack->context.ContextFlags |= saved_flags;  /* restore flags */
+        }
+
+        stack->context.EFlags &= ~0x100;  /* clear single-step flag */
+    }
+
     /* store return address and %rbp without aligning, so that the offset is fixed */
     rsp_ptr = (ULONG64 *)RSP_sig(sigcontext) - 16;
     *(--rsp_ptr) = RIP_sig(sigcontext);
@@ -3070,7 +3058,7 @@ static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
         break;
     }

-    setup_raise_exception( sigcontext, rec, raise_trap_exception );
+    setup_raise_exception( sigcontext, rec, raise_generic_exception );
 }

/**********************************************************************