Alexandre Julliard : wow64: In system calls always return the status from Wow64SystemServiceEx.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 419e4d69d6c3a4ea8b355f8b3fc211950eed0cdd
URL:    https://gitlab.winehq.org/wine/wine/-/commit/419e4d69d6c3a4ea8b355f8b3fc2119...

Author: Alexandre Julliard 
Date:   Tue Mar  7 17:21:29 2023 +0100

wow64: In system calls always return the status from Wow64SystemServiceEx.

---

dlls/wow64/syscall.c | 17 ++++++++++++++++-
 dlls/wow64cpu/cpu.c  |  1 +
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/dlls/wow64/syscall.c b/dlls/wow64/syscall.c
index dd3937640bc..1feeac083d9 100644
--- a/dlls/wow64/syscall.c
+++ b/dlls/wow64/syscall.c
@@ -143,6 +143,19 @@ static EXCEPTION_RECORD *exception_record_32to64( const EXCEPTION_RECORD32 *rec3
 }

+static NTSTATUS get_context_return_value( void *wow_context )
+{
+    switch (current_machine)
+    {
+    case IMAGE_FILE_MACHINE_I386:
+        return ((I386_CONTEXT *)wow_context)->Eax;
+    case IMAGE_FILE_MACHINE_ARMNT:
+        return ((ARM_CONTEXT *)wow_context)->R0;
+    }
+    return 0;
+}
+
+
 /**********************************************************************
  *           call_user_exception_dispatcher
  */
@@ -400,9 +413,11 @@ NTSTATUS WINAPI wow64_NtContinue( UINT *args )
     void *context = get_ptr( &args );
     BOOLEAN alertable = get_ulong( &args );

+    NTSTATUS status = get_context_return_value( context );
+
     pBTCpuSetContext( GetCurrentThread(), GetCurrentProcess(), NULL, context );
     if (alertable) NtTestAlert();
-    return STATUS_SUCCESS;
+    return status;
 }

diff --git a/dlls/wow64cpu/cpu.c b/dlls/wow64cpu/cpu.c
index 835353d9af8..13c94751d19 100644
--- a/dlls/wow64cpu/cpu.c
+++ b/dlls/wow64cpu/cpu.c
@@ -192,6 +192,7 @@ __ASM_GLOBAL_FUNC( syscall_32to64,
                    "movq %rax,%rcx\n\t"         /* syscall number */
                    "leaq 8(%r14),%rdx\n\t"      /* parameters */
                    "call " __ASM_NAME("Wow64SystemServiceEx") "\n\t"
+                   "movl %eax,0xb0(%r13)\n\t"   /* context->Eax */

"syscall_32to64_return:\n\t"
                    "movl 0x9c(%r13),%edi\n\t"   /* context->Edi */