[PATCH v2 13/20] hurd: Add a basic AArch64 port

[Sergey Bugaev <bugaevc@gmail.com>]

The following commits will add TLS, HTL, and the signal bits.

Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
---
 sysdeps/mach/hurd/aarch64/Implies        |  3 ++
 sysdeps/mach/hurd/aarch64/longjmp-ts.c   | 49 ++++++++++++++++++++++
 sysdeps/mach/hurd/aarch64/shlib-versions |  2 +
 sysdeps/mach/hurd/aarch64/static-start.S | 52 ++++++++++++++++++++++++
 sysdeps/mach/hurd/aarch64/vm_param.h     | 24 +++++++++++
 5 files changed, 130 insertions(+)
 create mode 100644 sysdeps/mach/hurd/aarch64/Implies
 create mode 100644 sysdeps/mach/hurd/aarch64/longjmp-ts.c
 create mode 100644 sysdeps/mach/hurd/aarch64/shlib-versions
 create mode 100644 sysdeps/mach/hurd/aarch64/static-start.S
 create mode 100644 sysdeps/mach/hurd/aarch64/vm_param.h

diff --git a/sysdeps/mach/hurd/aarch64/Implies b/sysdeps/mach/hurd/aarch64/Implies
new file mode 100644
index 00000000..02af165f
--- /dev/null
+++ b/sysdeps/mach/hurd/aarch64/Implies
@@ -0,0 +1,3 @@
+mach/hurd/htl
+aarch64/htl
+mach/hurd/aarch64/htl
diff --git a/sysdeps/mach/hurd/aarch64/longjmp-ts.c b/sysdeps/mach/hurd/aarch64/longjmp-ts.c
new file mode 100644
index 00000000..2fcb7493
--- /dev/null
+++ b/sysdeps/mach/hurd/aarch64/longjmp-ts.c
@@ -0,0 +1,49 @@
+/* Perform a `longjmp' on a Mach thread_state.  AArch64 version.
+   Copyright (C) 1991-2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C 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.
+
+   The GNU C 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 the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <setjmp.h>
+#include <jmpbuf-offsets.h>
+#include <mach/thread_status.h>
+
+
+/* Set up STATE to do the equivalent of `longjmp (ENV, VAL);'.  */
+
+void
+_hurd_longjmp_thread_state (void *state, jmp_buf env, int val)
+{
+  struct aarch64_thread_state *ts = state;
+
+  ts->x[19] = env[0].__jmpbuf[JB_X19];
+  ts->x[20] = env[0].__jmpbuf[JB_X20];
+  ts->x[21] = env[0].__jmpbuf[JB_X21];
+  ts->x[22] = env[0].__jmpbuf[JB_X22];
+  ts->x[23] = env[0].__jmpbuf[JB_X23];
+  ts->x[24] = env[0].__jmpbuf[JB_X24];
+  ts->x[25] = env[0].__jmpbuf[JB_X25];
+  ts->x[26] = env[0].__jmpbuf[JB_X26];
+  ts->x[27] = env[0].__jmpbuf[JB_X27];
+  ts->x[28] = env[0].__jmpbuf[JB_X28];
+  ts->x[29] = env[0].__jmpbuf[JB_X29];
+
+  /* XXX: We're ignoring all the d[] (SIMD) registers.
+     Is that fine?  */
+
+  ts->pc = PTR_DEMANGLE (env[0].__jmpbuf[JB_LR]);
+  ts->sp = _jmpbuf_sp (env[0].__jmpbuf);
+  ts->x[0] = val ?: 1;
+}
diff --git a/sysdeps/mach/hurd/aarch64/shlib-versions b/sysdeps/mach/hurd/aarch64/shlib-versions
new file mode 100644
index 00000000..b9e7c2cb
--- /dev/null
+++ b/sysdeps/mach/hurd/aarch64/shlib-versions
@@ -0,0 +1,2 @@
+DEFAULT			GLIBC_2.40
+ld=ld-aarch64.so.1
diff --git a/sysdeps/mach/hurd/aarch64/static-start.S b/sysdeps/mach/hurd/aarch64/static-start.S
new file mode 100644
index 00000000..e09865c4
--- /dev/null
+++ b/sysdeps/mach/hurd/aarch64/static-start.S
@@ -0,0 +1,52 @@
+/* Startup code for statically linked Hurd/AArch64 binaries.
+   Copyright (C) 1998-2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C 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.
+
+   The GNU C 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 the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+/* This is the actual entry point for statically linked aarch64-gnu executables,
+   the very first code to run in a process.  */
+
+	.text
+ENTRY(_start)
+	/* Set up the initial stack frame.  */
+	cfi_undefined (x30)
+	mov	x29, #0
+	mov	x30, #0
+
+	/* Pre-fill GOT entries for select ifunc routines that may get
+	   called during _hurd_stack_setup () with baseline implementations.  */
+	adrp	x1, __memcpy_generic
+	add	x1, x1, #:lo12:__memcpy_generic
+	adrp	x0, :got:memcpy
+	str	x1, [x0, :got_lo12:memcpy]
+
+	adrp	x1, __strlen_generic
+	add	x1, x1, #:lo12:__strlen_generic
+	adrp	x0, :got:strlen
+	str	x1, [x0, :got_lo12:strlen]
+
+	mov	x0, sp
+	bl	_hurd_stack_setup
+
+	/* Jump to the regular entry point.  */
+	mov	x0, #0
+	b	_start1
+END(_start)
+
+#define _start _start1
+#include <sysdeps/aarch64/start.S>
diff --git a/sysdeps/mach/hurd/aarch64/vm_param.h b/sysdeps/mach/hurd/aarch64/vm_param.h
new file mode 100644
index 00000000..304a2f2b
--- /dev/null
+++ b/sysdeps/mach/hurd/aarch64/vm_param.h
@@ -0,0 +1,24 @@
+/* Copyright (C) 2020-2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C 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.
+
+   The GNU C 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 the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _AARCH64_VM_PARAM_H
+#define _AARCH64_VM_PARAM_H
+
+/* Arbitrary start of the brk. This is after usual binary and library mappings.  */
+#define BRK_START	0x200000000000
+
+#endif /* aarch64/vm_param.h */
-- 
2.44.0