Revisions for untitled paste

+From fa1df4f95659b1b53bfbf82f936a687bf9af3191 Mon Sep 17 00:00:00 2001
+From: Sergey Bugaev <[email protected]>
+Date: Mon, 1 Jan 2024 14:41:35 +0300
+Subject: [PATCH 3/3] libgcc: Add basic support for aarch64-gnu (GNU/Hurd on
+ AArch64)
+
+There is currently no unwinding implementation.
+
+Signed-off-by: Sergey Bugaev <[email protected]>
+---
+ libgcc/config.host                      |  9 +++++++
+ libgcc/config/aarch64/gnu-unwind.h      | 36 +++++++++++++++++++++++++
+ libgcc/config/aarch64/heap-trampoline.c |  4 +--
+ 3 files changed, 47 insertions(+), 2 deletions(-)
+ create mode 100644 libgcc/config/aarch64/gnu-unwind.h
+
+diff --git a/libgcc/config.host b/libgcc/config.host
+index 54d06978a..c5b4df2c5 100644
+--- a/libgcc/config.host
++++ b/libgcc/config.host
+@@ -448,6 +448,15 @@ aarch64*-*-linux*)
+ 	tmake_file="${tmake_file} t-dfprules"
+ 	tmake_file="${tmake_file} ${cpu_type}/t-heap-trampoline"
+ 	;;
++aarch64*-*-gnu*)
++	extra_parts="$extra_parts crtfastmath.o"
++	md_unwind_header=aarch64/gnu-unwind.h
++	tmake_file="${tmake_file} ${cpu_type}/t-aarch64"
++	tmake_file="${tmake_file} ${cpu_type}/t-lse t-slibgcc-libgcc"
++	tmake_file="${tmake_file} ${cpu_type}/t-softfp t-softfp t-crtfm"
++	tmake_file="${tmake_file} t-dfprules"
++	tmake_file="${tmake_file} ${cpu_type}/t-heap-trampoline"
++	;;
+ aarch64*-*-vxworks7*)
+ 	extra_parts="$extra_parts crtfastmath.o"
+ 	md_unwind_header=aarch64/aarch64-unwind.h
+diff --git a/libgcc/config/aarch64/gnu-unwind.h b/libgcc/config/aarch64/gnu-unwind.h
+new file mode 100644
+index 000000000..d9e485a18
+--- /dev/null
++++ b/libgcc/config/aarch64/gnu-unwind.h
+@@ -0,0 +1,36 @@
++/* DWARF2 EH unwinding support for GNU Hurd: aarch64.
++   Copyright (C) 2020-2024 Free Software Foundation, Inc.
++
++This file is part of GCC.
++
++GCC is free software; you can redistribute it and/or modify
++it under the terms of the GNU General Public License as published by
++the Free Software Foundation; either version 3, or (at your option)
++any later version.
++
++GCC 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 General Public License for more details.
++
++Under Section 7 of GPL version 3, you are granted additional
++permissions described in the GCC Runtime Library Exception, version
++3.1, as published by the Free Software Foundation.
++
++You should have received a copy of the GNU General Public License and
++a copy of the GCC Runtime Library Exception along with this program;
++see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
++<http://www.gnu.org/licenses/>.  */
++
++/* Always include AArch64 unwinder header file.  */
++#include "config/aarch64/aarch64-unwind.h"
++
++#ifndef inhibit_libc
++
++#include <signal.h>
++
++/*
++ * TODO: support for aarch64 needs to be implemented.
++ */
++
++#endif /* ifndef inhibit_libc */
+diff --git a/libgcc/config/aarch64/heap-trampoline.c b/libgcc/config/aarch64/heap-trampoline.c
+index f22233987..6565584c7 100644
+--- a/libgcc/config/aarch64/heap-trampoline.c
++++ b/libgcc/config/aarch64/heap-trampoline.c
+@@ -23,7 +23,7 @@ void *allocate_trampoline_page (void);
+ void __builtin_nested_func_ptr_created (void *chain, void *func, void **dst);
+ void __builtin_nested_func_ptr_deleted (void);
+ 
+-#if defined(__gnu_linux__)
++#if defined(__gnu_linux__) || defined(__gnu_hurd__)
+ static const uint32_t aarch64_trampoline_insns[] = {
+   0xd503245f, /* hint    34 */
+   0x580000b1, /* ldr     x17, .+20 */
+@@ -76,7 +76,7 @@ allocate_trampoline_page (void)
+ {
+   void *page;
+ 
+-#if defined(__gnu_linux__)
++#if defined(__gnu_linux__) || defined(__gnu_hurd__)
+   page = mmap (0, getpagesize (), PROT_WRITE | PROT_EXEC,
+ 	       MAP_ANON | MAP_PRIVATE, 0, 0);
+ #elif __APPLE__
+-- 
+2.44.0