Alexandre Julliard : ntdll: Implement __C_specific_handler on ARM64EC.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: c47d6ef1f782fe305851ac339c8424162ca7c559
URL:    https://gitlab.winehq.org/wine/wine/-/commit/c47d6ef1f782fe305851ac339c84241...

Author: Alexandre Julliard 
Date:   Wed Mar 13 11:03:01 2024 +0100

ntdll: Implement __C_specific_handler on ARM64EC.

---

dlls/ntdll/signal_arm64ec.c | 34 ++++++++++++++++++++++++++++++++++
 dlls/ntdll/unwind.c         |  6 ++++++
 2 files changed, 40 insertions(+)

diff --git a/dlls/ntdll/signal_arm64ec.c b/dlls/ntdll/signal_arm64ec.c
index 1007df91f85..55ed12a609a 100644
--- a/dlls/ntdll/signal_arm64ec.c
+++ b/dlls/ntdll/signal_arm64ec.c
@@ -2333,6 +2333,40 @@ void __attribute__((naked)) __chkstk_arm64ec(void)
 }

+/*******************************************************************
+ *		__C_ExecuteExceptionFilter
+ */
+LONG __attribute__((naked)) __C_ExecuteExceptionFilter( EXCEPTION_POINTERS *ptrs, void *frame,
+                                                        PEXCEPTION_FILTER filter, BYTE *nonvolatile )
+{
+    asm( ".seh_proc _C_ExecuteExceptionFilter\n\t"
+         "stp x29, x30, [sp, #-80]!\n\t"
+         ".seh_save_fplr_x 80\n\t"
+         "stp x19, x20, [sp, #16]\n\t"
+         ".seh_save_regp x19, 16\n\t"
+         "stp x21, x22, [sp, #32]\n\t"
+         ".seh_save_regp x21, 32\n\t"
+         "stp x25, x26, [sp, #48]\n\t"
+         ".seh_save_regp x25, 48\n\t"
+         "str x27, [sp, #64]\n\t"
+         ".seh_save_reg x27, 64\n\t"
+         ".seh_endprologue\n\t"
+         "ldp x19, x20, [x3, #0]\n\t" /* nonvolatile regs */
+         "ldp x21, x22, [x3, #16]\n\t"
+         "ldp x25, x26, [x3, #48]\n\t"
+         "ldr x27, [x3, #64]\n\t"
+         "ldr x1,  [x3, #80]\n\t"     /* x29 = frame */
+         "blr x2\n\t"                 /* filter */
+         "ldp x19, x20, [sp, #16]\n\t"
+         "ldp x21, x22, [sp, #32]\n\t"
+         "ldp x25, x26, [sp, #48]\n\t"
+         "ldr x27,      [sp, #64]\n\t"
+         "ldp x29, x30, [sp], #80\n\t"
+         "ret\n\t"
+         ".seh_endproc" );
+}
+
+
 /***********************************************************************
  *		RtlRaiseException (NTDLL.@)
  */
diff --git a/dlls/ntdll/unwind.c b/dlls/ntdll/unwind.c
index 3960d13143d..06779247da1 100644
--- a/dlls/ntdll/unwind.c
+++ b/dlls/ntdll/unwind.c
@@ -2204,6 +2204,12 @@ EXCEPTION_DISPOSITION WINAPI __C_specific_handler( EXCEPTION_RECORD *rec, void *
     ULONG_PTR pc = dispatch->ControlPc;
     unsigned int i;

+#ifdef __arm64ec__
+    if (RtlIsEcCode( pc ))
+        return __C_specific_handler_arm64( rec, frame, (ARM64_NT_CONTEXT *)context,
+                                           (DISPATCHER_CONTEXT_ARM64 *)dispatch );
+#endif
+
     TRACE( "%p %p %p %p pc %Ix\n", rec, frame, context, dispatch, pc );
     if (TRACE_ON(unwind)) DUMP_SCOPE_TABLE( base, table );