[PATCH v2 08/20] aarch64: Add dl-procinfo

[Sergey Bugaev <bugaevc@gmail.com>]

This is based on the Linux version, but doesn't define
GLRO(dl_aarch64_cap_flags) and implement _dl_hwcap_string (which seems
unused anyway) based on Linux HWCAP bit values.

Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
---
 sysdeps/aarch64/dl-procinfo.c | 59 +++++++++++++++++++++++++++++++++++
 sysdeps/aarch64/dl-procinfo.h | 38 ++++++++++++++++++++++
 2 files changed, 97 insertions(+)
 create mode 100644 sysdeps/aarch64/dl-procinfo.c
 create mode 100644 sysdeps/aarch64/dl-procinfo.h

diff --git a/sysdeps/aarch64/dl-procinfo.c b/sysdeps/aarch64/dl-procinfo.c
new file mode 100644
index 00000000..5a51edbc
--- /dev/null
+++ b/sysdeps/aarch64/dl-procinfo.c
@@ -0,0 +1,59 @@
+/* Data for AArch64 version of processor capability information.
+   Copyright (C) 2017-2024 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/>.  */
+
+/* If anything should be added here check whether the size of each string
+   is still ok with the given array size.
+
+   All the #ifdefs in the definitions are quite irritating but
+   necessary if we want to avoid duplicating the information.  There
+   are three different modes:
+
+   - PROCINFO_DECL is defined.  This means we are only interested in
+     declarations.
+
+   - PROCINFO_DECL is not defined:
+
+     + if SHARED is defined the file is included in an array
+       initializer.  The .element = { ... } syntax is needed.
+
+     + if SHARED is not defined a normal array initialization is
+       needed.
+  */
+
+#ifndef PROCINFO_CLASS
+# define PROCINFO_CLASS
+#endif
+
+#if !IS_IN (ldconfig)
+# if !defined PROCINFO_DECL && defined SHARED
+  ._dl_aarch64_cpu_features
+# else
+PROCINFO_CLASS struct cpu_features _dl_aarch64_cpu_features
+# endif
+# ifndef PROCINFO_DECL
+= { }
+# endif
+# if !defined SHARED || defined PROCINFO_DECL
+;
+# else
+,
+# endif
+#endif
+
+#undef PROCINFO_DECL
+#undef PROCINFO_CLASS
diff --git a/sysdeps/aarch64/dl-procinfo.h b/sysdeps/aarch64/dl-procinfo.h
new file mode 100644
index 00000000..176de5cd
--- /dev/null
+++ b/sysdeps/aarch64/dl-procinfo.h
@@ -0,0 +1,38 @@
+/* Processor capability information handling macros - aarch64 version.
+   Copyright (C) 2017-2024 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 _DL_PROCINFO_H
+#define _DL_PROCINFO_H	1
+
+#include <sys/auxv.h>
+#include <unistd.h>
+#include <ldsodefs.h>
+#include <sysdep.h>
+
+/* We cannot provide a general printing function.  */
+#define _dl_procinfo(type, word) -1
+
+/* No additional library search paths.  */
+#define HWCAP_IMPORTANT HWCAP_ATOMICS
+
+/* There're no platforms to filter out.  */
+#define _DL_HWCAP_PLATFORM 0
+
+#define _dl_string_platform(str) (-1)
+
+#endif /* dl-procinfo.h */
-- 
2.44.0