André Zwing : wow64: Ignore Thumb flag when parsing ARM syscall number.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 02fcbeb5a16844dd4640e9eec67650f9b1a428ff
URL:    https://gitlab.winehq.org/wine/wine/-/commit/02fcbeb5a16844dd4640e9eec67650f...

Author: André Zwing <nerv(a)dawncrow.de>
Date:   Tue Jun  6 18:00:14 2023 +0200

wow64: Ignore Thumb flag when parsing ARM syscall number.

---

 dlls/wow64/syscall.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/dlls/wow64/syscall.c b/dlls/wow64/syscall.c
index 06dd9822a08..23f8915aa64 100644
--- a/dlls/wow64/syscall.c
+++ b/dlls/wow64/syscall.c
@@ -639,6 +639,7 @@ NTSTATUS WINAPI wow64_NtWow64IsProcessorFeaturePresent( UINT *args )
  */
 static DWORD get_syscall_num( const BYTE *syscall )
 {
+    WORD *arm_syscall = (WORD *)((ULONG_PTR)syscall & ~1);
     DWORD id = ~0u;
 
     if (!syscall) return id;
@@ -650,9 +651,9 @@ static DWORD get_syscall_num( const BYTE *syscall )
         break;
 
     case IMAGE_FILE_MACHINE_ARMNT:
-        if (*(WORD *)syscall == 0xb40f)
+        if (*arm_syscall == 0xb40f)
         {
-            DWORD inst = *(DWORD *)((WORD *)syscall + 1);
+            DWORD inst = *(DWORD *)(arm_syscall + 1);
             id = ((inst << 1) & 0x0800) + ((inst << 12) & 0xf000) +
                 ((inst >> 20) & 0x0700) + ((inst >> 16) & 0x00ff);
         }