Alexandre Julliard : ntdll: Use the sysv ABI for __wine_syscall_dispatcher_return().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 931292f1a6af1fee99e2e7a0bad787d8436219ef
URL:    https://gitlab.winehq.org/wine/wine/-/commit/931292f1a6af1fee99e2e7a0bad787d...

Author: Alexandre Julliard 
Date:   Fri Jun  9 16:49:41 2023 +0200

ntdll: Use the sysv ABI for __wine_syscall_dispatcher_return().

Missing from b337c5b1a1757b2abbc90a7c6955d64242861ab9, spotted by Fan
WenJie.

---

dlls/ntdll/unix/signal_x86_64.c | 10 ++++++----
 dlls/ntdll/unix/unix_private.h  |  2 +-
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/dlls/ntdll/unix/signal_x86_64.c b/dlls/ntdll/unix/signal_x86_64.c
index 48443799ef6..0204139631f 100644
--- a/dlls/ntdll/unix/signal_x86_64.c
+++ b/dlls/ntdll/unix/signal_x86_64.c
@@ -1861,8 +1861,8 @@ static BOOL handle_syscall_fault( ucontext_t *sigcontext, EXCEPTION_RECORD *rec,
     else
     {
         TRACE_(seh)( "returning to user mode ip=%016lx ret=%08x\n", frame->rip, rec->ExceptionCode );
-        RCX_sig(sigcontext) = (ULONG_PTR)frame;
-        RDX_sig(sigcontext) = rec->ExceptionCode;
+        RDI_sig(sigcontext) = (ULONG_PTR)frame;
+        RSI_sig(sigcontext) = rec->ExceptionCode;
         RIP_sig(sigcontext) = (ULONG_PTR)__wine_syscall_dispatcher_return;
     }
     return TRUE;
@@ -2824,14 +2824,16 @@ __ASM_GLOBAL_FUNC( __wine_syscall_dispatcher,
                    __ASM_CFI_REG_IS_AT1(r14, rbp, 0x48)
                    __ASM_CFI_REG_IS_AT1(r15, rbp, 0x50)
                    __ASM_CFI_REG_IS_AT1(rbp, rbp, 0x00)
-                   "5:\tmovl $0xc000000d,%edx\n\t" /* STATUS_INVALID_PARAMETER */
+                   "5:\tmovl $0xc000000d,%eax\n\t" /* STATUS_INVALID_PARAMETER */
                    "movq %rsp,%rcx\n\t"
                    /* $rcx is now pointing to "frame" again */
                    __ASM_CFI(".cfi_restore_state\n\t")
+                   "jmp " __ASM_LOCAL_LABEL("__wine_syscall_dispatcher_return") "\n\t"
                    ".globl " __ASM_NAME("__wine_syscall_dispatcher_return") "\n"
                    __ASM_NAME("__wine_syscall_dispatcher_return") ":\n\t"
+                   "movq %rdi,%rcx\n\t"
                    "movl 0xb0(%rcx),%r14d\n\t"     /* frame->syscall_flags */
-                   "movq %rdx,%rax\n\t"
+                   "movq %rsi,%rax\n\t"
                    "jmp " __ASM_LOCAL_LABEL("__wine_syscall_dispatcher_return") )

diff --git a/dlls/ntdll/unix/unix_private.h b/dlls/ntdll/unix/unix_private.h
index a9a829a1685..4d62c4f6570 100644
--- a/dlls/ntdll/unix/unix_private.h
+++ b/dlls/ntdll/unix/unix_private.h
@@ -266,7 +266,7 @@ extern void DECLSPEC_NORETURN signal_start_thread( PRTL_THREAD_START_ROUTINE ent
 extern void DECLSPEC_NORETURN signal_exit_thread( int status, void (*func)(int), TEB *teb ) DECLSPEC_HIDDEN;
 extern SYSTEM_SERVICE_TABLE KeServiceDescriptorTable[4] DECLSPEC_HIDDEN;
 extern void __wine_syscall_dispatcher(void) DECLSPEC_HIDDEN;
-extern void WINAPI DECLSPEC_NORETURN __wine_syscall_dispatcher_return( void *frame, ULONG_PTR retval ) DECLSPEC_HIDDEN;
+extern void DECLSPEC_NORETURN __wine_syscall_dispatcher_return( void *frame, ULONG_PTR retval ) DECLSPEC_HIDDEN;
 extern void __wine_unix_call_dispatcher(void) DECLSPEC_HIDDEN;
 extern NTSTATUS signal_set_full_context( CONTEXT *context ) DECLSPEC_HIDDEN;
 extern NTSTATUS get_thread_wow64_context( HANDLE handle, void *ctx, ULONG size ) DECLSPEC_HIDDEN;