[glibc] hurd, htl: Add some x86_64-specific code

[Samuel Thibault <sthibaul@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d08ae9c3fbf583508c300c7fa59ce6a05a8a47b6

commit d08ae9c3fbf583508c300c7fa59ce6a05a8a47b6
Author: Sergey Bugaev <bugaevc@gmail.com>
Date:   Sun Feb 12 14:10:42 2023 +0300

    hurd, htl: Add some x86_64-specific code
    
    Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
    Message-Id: <20230212111044.610942-12-bugaevc@gmail.com>

Diff:
---
 sysdeps/mach/hurd/x86_64/static-start.S | 27 +++++++++++++++++++++++++++
 sysdeps/mach/hurd/x86_64/tlsdesc.sym    | 22 ++++++++++++++++++++++
 sysdeps/x86_64/htl/machine-sp.h         | 29 +++++++++++++++++++++++++++++
 3 files changed, 78 insertions(+)

diff --git a/sysdeps/mach/hurd/x86_64/static-start.S b/sysdeps/mach/hurd/x86_64/static-start.S
new file mode 100644
index 0000000000..982d3d52e4
--- /dev/null
+++ b/sysdeps/mach/hurd/x86_64/static-start.S
@@ -0,0 +1,27 @@
+/* Startup code for statically linked Hurd/x86_64 binaries.
+   Copyright (C) 1998-2023 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/>.  */
+
+	.text
+	.globl _start
+_start:
+	call _hurd_stack_setup
+	xorq %rdx, %rdx
+	jmp _start1
+
+#define _start _start1
+#include <sysdeps/x86_64/start.S>
diff --git a/sysdeps/mach/hurd/x86_64/tlsdesc.sym b/sysdeps/mach/hurd/x86_64/tlsdesc.sym
new file mode 100644
index 0000000000..da3b96c1cc
--- /dev/null
+++ b/sysdeps/mach/hurd/x86_64/tlsdesc.sym
@@ -0,0 +1,22 @@
+#include <stddef.h>
+#include <sysdep.h>
+#include <tls.h>
+#include <link.h>
+#include <dl-tlsdesc.h>
+
+--
+
+-- We have to override sysdeps/x86_64/tlsdesc.sym to adapt to our libpthread.
+
+-- Abuse tls.h macros to derive offsets relative to the thread register.
+
+DTV_OFFSET			offsetof(tcbhead_t, dtv)
+
+TLSDESC_ARG			offsetof(struct tlsdesc, arg)
+
+TLSDESC_GEN_COUNT		offsetof(struct tlsdesc_dynamic_arg, gen_count)
+TLSDESC_MODID			offsetof(struct tlsdesc_dynamic_arg, tlsinfo.ti_module)
+TLSDESC_MODOFF			offsetof(struct tlsdesc_dynamic_arg, tlsinfo.ti_offset)
+
+TI_MODULE_OFFSET		offsetof(tls_index, ti_module)
+TI_OFFSET_OFFSET		offsetof(tls_index, ti_offset)
diff --git a/sysdeps/x86_64/htl/machine-sp.h b/sysdeps/x86_64/htl/machine-sp.h
new file mode 100644
index 0000000000..7ae1c94108
--- /dev/null
+++ b/sysdeps/x86_64/htl/machine-sp.h
@@ -0,0 +1,29 @@
+/* Machine-specific function to return the stack pointer.  x86_64 version.
+   Copyright (C) 1994-2023 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 _MACHINE_SP_H
+#define _MACHINE_SP_H
+
+/* Return the current stack pointer.  */
+
+#define __thread_stack_pointer() ({						\
+  register uintptr_t __sp__ asm("rsp");						\
+  __sp__;									\
+})
+
+#endif /* machine-sp.h */