Alexandre Julliard : ntdll: Fixup the pc address for breakpoint exceptions on ARM64.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 4fabaa6a284fc9409faff03d69f5b48efc8e8aa6
URL:    https://gitlab.winehq.org/wine/wine/-/commit/4fabaa6a284fc9409faff03d69f5b48...

Author: Alexandre Julliard 
Date:   Fri Sep 15 15:57:09 2023 +0200

ntdll: Fixup the pc address for breakpoint exceptions on ARM64.

---

dlls/ntdll/unix/signal_arm64.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/dlls/ntdll/unix/signal_arm64.c b/dlls/ntdll/unix/signal_arm64.c
index 6dbc3fd5a59..4897b8e1824 100644
--- a/dlls/ntdll/unix/signal_arm64.c
+++ b/dlls/ntdll/unix/signal_arm64.c
@@ -1018,6 +1018,9 @@ static void setup_exception( ucontext_t *sigcontext, EXCEPTION_RECORD *rec )
         return;
     }

+    /* fix up instruction pointer in context for EXCEPTION_BREAKPOINT */
+    if (rec->ExceptionCode == EXCEPTION_BREAKPOINT) context.Pc -= 4;
+
     stack = virtual_setup_exception( stack_ptr, (sizeof(*stack) + 15) & ~15, rec );
     stack->rec = *rec;
     stack->context = context;
@@ -1336,6 +1339,7 @@ static void trap_handler( int signal, siginfo_t *siginfo, void *sigcontext )
             NtRaiseException( &rec, &ctx, FALSE );
             return;
         }
+        PC_sig( context ) += 4;  /* skip the brk instruction */
         rec.ExceptionCode = EXCEPTION_BREAKPOINT;
         rec.NumberParameters = 1;
         break;