[reactos] 01/01: [NTOS:KE] Fix EIP only when the breakpoint is a break

[Jérôme Gardou]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=158235bdd53577013cff99...

commit 158235bdd53577013cff990f554763ddda6ec6a4
Author:     Jérôme Gardou [e-mail]
AuthorDate: Mon Feb 1 16:36:53 2021 +0100
Commit:     Jérôme Gardou [e-mail]
CommitDate: Mon Feb 1 16:39:39 2021 +0100

[NTOS:KE] Fix EIP only when the breakpoint is a break

Fixes ntdll:exception winetest crash
    ROSTESTS-80
---
 ntoskrnl/ke/i386/traphdlr.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ntoskrnl/ke/i386/traphdlr.c b/ntoskrnl/ke/i386/traphdlr.c
index cf4dbdd92ee..1ae5bf02240 100644
--- a/ntoskrnl/ke/i386/traphdlr.c
+++ b/ntoskrnl/ke/i386/traphdlr.c
@@ -227,10 +227,10 @@ KiDebugHandler(IN PKTRAP_FRAME TrapFrame,
     /* Enable interrupts if the trap came from user-mode */
     if (KiUserTrap(TrapFrame)) _enable();

-    /* Dispatch the exception  */
+    /* Dispatch the exception. Fix EIP in case its a break breakpoint (sic) */
     KiDispatchExceptionFromTrapFrame(STATUS_BREAKPOINT,
                                      0,
-                                     TrapFrame->Eip - 1,
+                                     TrapFrame->Eip - (Parameter1 == BREAKPOINT_BREAK),
                                      3,
                                      Parameter1,
                                      Parameter2,