André Hentschel : ntdll: Use correct PC for instruction decoding on ARM64.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 1b5b311cce908e33a5b1b11d5eb659e99c92c2f9
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=1b5b311cce908e33a5b1b11d5...

Author: André Hentschel <nerv(a)dawncrow.de>
Date:   Fri Dec 21 20:07:48 2018 +0100

ntdll: Use correct PC for instruction decoding on ARM64.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=46194
Signed-off-by: André Hentschel <nerv(a)dawncrow.de>
Signed-off-by: Alexandre Julliard <julliard(a)winehq.org>

---

 dlls/ntdll/signal_arm64.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/dlls/ntdll/signal_arm64.c b/dlls/ntdll/signal_arm64.c
index c976884..e195889 100644
--- a/dlls/ntdll/signal_arm64.c
+++ b/dlls/ntdll/signal_arm64.c
@@ -611,9 +611,9 @@ static NTSTATUS raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL f
     return STATUS_SUCCESS;
 }
 
-static inline DWORD is_write_fault( ucontext_t *context )
+static inline DWORD is_write_fault( DWORD *pc )
 {
-    DWORD inst = *(DWORD *)PC_sig(context);
+    DWORD inst = *pc;
     if ((inst & 0xbfff0000) == 0x0c000000   /* C3.3.1 */ ||
         (inst & 0xbfe00000) == 0x0c800000   /* C3.3.2 */ ||
         (inst & 0xbfdf0000) == 0x0d000000   /* C3.3.3 */ ||
@@ -637,6 +637,7 @@ static void segv_handler( int signal, siginfo_t *info, void *ucontext )
 {
     EXCEPTION_RECORD *rec;
     ucontext_t *context = ucontext;
+    DWORD *orig_pc = PC_sig(context);
 
     /* check for page fault inside the thread stack */
     if (signal == SIGSEGV &&
@@ -664,7 +665,7 @@ static void segv_handler( int signal, siginfo_t *info, void *ucontext )
     case SIGSEGV:  /* Segmentation fault */
         rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
         rec->NumberParameters = 2;
-        rec->ExceptionInformation[0] = is_write_fault(context);
+        rec->ExceptionInformation[0] = is_write_fault(orig_pc);
         rec->ExceptionInformation[1] = (ULONG_PTR)info->si_addr;
         break;
     case SIGBUS:  /* Alignment check exception */