winecrt0: Initial ARM64EC support.

dlls/winecrt0/Makefile.in

 STATICLIB = libwinecrt0.a
 
 SOURCES = \
+	arm64ec.c \
 	crt_dllmain.c \
 	crt_fltused.c \
 	debug.c \

dlls/winecrt0/arm64ec.c

+/*
+ * Arm64EC support
+ *
+ * Copyright 2023 Jacek Caban for CodeWeavers
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#ifdef __arm64ec__
+
+#include "windef.h"
+#include "winnt.h"
+#include "wine/asm.h"
+
+void *__os_arm64x_check_call = 0;
+void *__os_arm64x_check_icall_cfg = 0;
+void *__os_arm64x_dispatch_call_no_redirect = 0;
+void *__os_arm64x_dispatch_fptr = 0;
+void *__os_arm64x_dispatch_ret = 0;
+void *__os_arm64x_get_x64_information = 0;
+void *__os_arm64x_set_x64_information = 0;
+
+void *__os_arm64x_helper0 = 0;
+void *__os_arm64x_helper1 = 0;
+void *__os_arm64x_helper2 = 0;
+void *__os_arm64x_helper3 = 0;
+void *__os_arm64x_helper4 = 0;
+void *__os_arm64x_helper5 = 0;
+void *__os_arm64x_helper6 = 0;
+void *__os_arm64x_helper7 = 0;
+void *__os_arm64x_helper8 = 0;
+
+void *__guard_check_icall_fptr = 0;
+void *__guard_dispatch_icall_fptr = 0;
+
+asm( ".section .data,\"drw\"\n"
+     ".balign 8\n"
+     ".globl __os_arm64x_dispatch_icall\n"
+     "__os_arm64x_dispatch_icall:\n"
+     ".globl __os_arm64x_check_icall\n"
+     "__os_arm64x_check_icall:\n"
+     ".xword 0\n" );
+
+__ASM_GLOBAL_FUNC( __icall_helper_arm64ec,
+                   "stp fp, lr, [sp, #-0x10]!\n\t"
+                   __ASM_SEH( ".seh_save_fplr_x 16\n\t" )
+                   "mov fp, sp\n\t"
+                   __ASM_SEH( ".seh_set_fp\n\t" )
+                   __ASM_SEH( ".seh_endprologue\n\t" )
+                   "adrp x16, __os_arm64x_dispatch_icall\n\t"
+                   "ldr x16, [x16, #:lo12:__os_arm64x_dispatch_icall]\n\t"
+                   "blr x16\n\t"
+                   __ASM_SEH( ".seh_startepilogue\n\t" )
+                   "ldp fp, lr, [sp], #0x10\n\t"
+                   __ASM_SEH( ".seh_save_fplr_x 0x10\n\t" )
+                   __ASM_SEH( ".seh_endepilogue\n\t" )
+		   "br x11" )
+
+asm( "\t.section .rdata,\"dr\"\n"
+     "\t.globl __chpe_metadata\n"
+     "\t.balign 4\n"
+     "__chpe_metadata:\n"
+     "\t.word 1\n"
+     "\t.rva __hybrid_code_map\n"
+     "\t.word __hybrid_code_map_count\n"
+     "\t.rva __x64_code_ranges_to_entry_points\n"
+     "\t.rva __arm64x_redirection_metadata\n"
+     "\t.rva __os_arm64x_dispatch_call_no_redirect\n"
+     "\t.rva __os_arm64x_dispatch_ret\n"
+     "\t.rva __os_arm64x_check_call\n"
+     "\t.rva __os_arm64x_check_icall\n"
+     "\t.rva __os_arm64x_check_icall_cfg\n"
+     "\t.rva __arm64x_native_entrypoint\n"
+     "\t.rva __hybrid_auxiliary_iat\n"
+     "\t.word __x64_code_ranges_to_entry_points_count\n"
+     "\t.word __arm64x_redirection_metadata_count\n"
+     "\t.rva __os_arm64x_get_x64_information\n"
+     "\t.rva __os_arm64x_set_x64_information\n"
+     "\t.rva __arm64x_extra_rfe_table\n"
+     "\t.word __arm64x_extra_rfe_table_size\n"
+     "\t.rva __os_arm64x_dispatch_fptr\n"
+     "\t.rva __hybrid_auxiliary_iat_copy\n"
+     "\t.rva __os_arm64x_helper0\n"
+     "\t.rva __os_arm64x_helper1\n"
+     "\t.rva __os_arm64x_helper2\n"
+     "\t.rva __os_arm64x_helper3\n"
+     "\t.rva __os_arm64x_helper4\n"
+     "\t.rva __os_arm64x_helper5\n"
+     "\t.rva __os_arm64x_helper6\n"
+     "\t.rva __os_arm64x_helper7\n"
+     "\t.rva __os_arm64x_helper8\n" );
+
+asm( "\t.section .rdata,\"dr\"\n"
+     "\t.globl _load_config_used\n"
+     "\t.balign 8\n"
+     "_load_config_used:\n"
+     "\t.word 0x140\n"
+     "\t.fill 0x54, 1, 0\n"
+     "\t.xword 0\n" /* FIXME: __security_cookie */
+     "\t.fill 0x10, 1, 0\n"
+     "\t.xword __guard_check_icall_fptr\n"
+     "\t.xword __guard_dispatch_icall_fptr\n"
+     "\t.xword __guard_fids_table\n"
+     "\t.xword __guard_fids_count\n"
+     "\t.xword __guard_flags\n"
+     "\t.xword 0\n"
+     "\t.xword __guard_iat_table\n"
+     "\t.xword __guard_iat_count\n"
+     "\t.xword __guard_longjmp_table\n"
+     "\t.xword __guard_longjmp_count\n"
+     "\t.xword 0\n"
+     "\t.xword __chpe_metadata\n"
+     "\t.fill 0x78, 1, 0\n" );
+
+#endif /* __arm64ec__ */