winebuild: Add a helper to build an ARM64EC function name.

tools/winebuild/build.h

@@ -287,6 +287,7 @@ extern int sort_func_list( ORDDEF **list, int count, int (*compare)(const void *
 extern unsigned int get_page_size(void);
 extern unsigned int get_args_size( const ORDDEF *odp );
 extern const char *asm_name( const char *func );
+extern const char *arm64_name( const char *func );
 extern const char *asm_globl( const char *func );
 extern const char *get_asm_ptr_keyword(void);
 extern const char *get_asm_string_keyword(void);

tools/winebuild/import.c

@@ -1347,7 +1347,7 @@ void output_stubs( DLLSPEC *spec )
             break;
         case CPU_ARM64:
         case CPU_ARM64EC:
-            output_seh( ".seh_proc %s", asm_name(name) );
+            output_seh( ".seh_proc %s", arm64_name(name) );
             output_seh( ".seh_endprologue" );
             output( "\tadrp x0, %s\n", arm64_page(".L__wine_spec_file_name") );
             output( "\tadd x0, x0, #%s\n", arm64_pageoff(".L__wine_spec_file_name") );
@@ -1360,7 +1360,7 @@ void output_stubs( DLLSPEC *spec )
             }
             else
                 output( "\tmov x1, %u\n", odp->ordinal );
-            output( "\tb %s\n", asm_name("__wine_spec_unimplemented_stub") );
+            output( "\tb %s\n", arm64_name("__wine_spec_unimplemented_stub") );
             output_seh( ".seh_endproc" );
             break;
         }
@@ -1476,7 +1476,7 @@ void output_syscalls( DLLSPEC *spec )
             break;
         case CPU_ARM64:
         case CPU_ARM64EC:
-            output_seh( ".seh_proc %s", asm_name(name) );
+            output_seh( ".seh_proc %s", arm64_name(name) );
             output_seh( ".seh_endprologue" );
             output( "\tmov x8, #%u\n", id );
             output( "\tmov x9, x30\n" );

tools/winebuild/utils.c

@@ -828,10 +828,24 @@ const char *asm_name( const char *sym )
     }
 }
 
+/* return the assembly name for an ARM64/ARM64EC function */
+const char *arm64_name( const char *sym )
+{
+    switch (target.platform)
+    {
+    case PLATFORM_MINGW:
+    case PLATFORM_WINDOWS:
+        if (target.cpu == CPU_ARM64EC) return strmake( "\"#%s\"", sym );
+        /* fall through */
+    default:
+        return asm_name( sym );
+    }
+}
+
 /* return an assembly function declaration for a C function name */
 void output_function_header( const char *func, int global )
 {
-    const char *name = asm_name( func );
+    const char *name = arm64_name( func );
 
     output( "\t.text\n" );