[PATCH] Provide a stub ioperm implementation for ARMv5 and later

[Aurelien Jarno <aurelien at aurel32 dot net>]

The ioperm, iopl, in{b,w,l} and out{b,w,l} functions only make sense
on ARMv4. This patch replaces them by stubs when the libc is built
for ARMv5 or later.
---
 ChangeLog                                   | 10 ++++
 sysdeps/arm/preconfigure                    |  5 ++
 sysdeps/arm/preconfigure.ac                 |  4 ++
 sysdeps/unix/sysv/linux/arm/armv5/ioperm.c  | 91 +++++++++++++++++++++++++++++
 sysdeps/unix/sysv/linux/arm/armv6/Implies   |  2 +
 sysdeps/unix/sysv/linux/arm/armv6t2/Implies |  2 +
 sysdeps/unix/sysv/linux/arm/armv7/Implies   |  2 +
 7 files changed, 116 insertions(+)
 create mode 100644 sysdeps/unix/sysv/linux/arm/armv5/ioperm.c
 create mode 100644 sysdeps/unix/sysv/linux/arm/armv6/Implies
 create mode 100644 sysdeps/unix/sysv/linux/arm/armv6t2/Implies
 create mode 100644 sysdeps/unix/sysv/linux/arm/armv7/Implies

diff --git a/ChangeLog b/ChangeLog
index 13be8a8..c76a5b3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,15 @@
 2015-12-11  Aurelien Jarno  <aurelien@aurel32.net>
 
+	* sysdeps/arm/preconfigure: Detect ARMv5.
+	* sysdeps/arm/preconfigure.ac: Regenerate.
+	* sysdeps/unix/sysv/linux/arm/armv5/ioperm.c: New file. Provide
+	stub functions for the ioperm functions family.
+	* sysdeps/unix/sysv/linux/arm/armv6/Implies: New file.
+	* sysdeps/unix/sysv/linux/arm/armv6t2/Implies: New file.
+	* sysdeps/unix/sysv/linux/arm/armv7/Implies: New file.
+
+2015-12-11  Aurelien Jarno  <aurelien@aurel32.net>
+
 	* sysdeps/unix/sysv/linux/arm/ioperm.c: Do not include
 	<linux/version.h>.
 	[LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,23)]: Remove
diff --git a/sysdeps/arm/preconfigure b/sysdeps/arm/preconfigure
index 33e9501..67259c5 100644
--- a/sysdeps/arm/preconfigure
+++ b/sysdeps/arm/preconfigure
@@ -44,6 +44,11 @@ $as_echo "$as_me: Found compiler is configured for $machine" >&6;}
     { $as_echo "$as_me:${as_lineno-$LINENO}: Found compiler is configured for $machine" >&5
 $as_echo "$as_me: Found compiler is configured for $machine" >&6;}
     ;;
+  x__ARM_ARCH_5*__)
+    machine=armv5
+    { $as_echo "$as_me:${as_lineno-$LINENO}: Found compiler is configured for $machine" >&5
+$as_echo "$as_me: Found compiler is configured for $machine" >&6;}
+    ;;
   *)
     machine=arm
     { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: arm/preconfigure: Did not find ARM architecture type; using default" >&5
diff --git a/sysdeps/arm/preconfigure.ac b/sysdeps/arm/preconfigure.ac
index 20de5bc..a140edc 100644
--- a/sysdeps/arm/preconfigure.ac
+++ b/sysdeps/arm/preconfigure.ac
@@ -40,6 +40,10 @@ arm*)
     machine=armv6
     AC_MSG_NOTICE([Found compiler is configured for $machine])
     ;;
+  x__ARM_ARCH_5*__)
+    machine=armv5
+    AC_MSG_NOTICE([Found compiler is configured for $machine])
+    ;;
   *)
     machine=arm
     AC_MSG_WARN([arm/preconfigure: Did not find ARM architecture type; using default])
diff --git a/sysdeps/unix/sysv/linux/arm/armv5/ioperm.c b/sysdeps/unix/sysv/linux/arm/armv5/ioperm.c
new file mode 100644
index 0000000..a18d436
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/arm/armv5/ioperm.c
@@ -0,0 +1,91 @@
+/* Access to hardware I/O ports. ARMv5 and later stub version.
+   Copyright (C) 1998-2015 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
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+
+int
+_ioperm (unsigned long int from, unsigned long int num, int turn_on)
+{
+  __set_errno (EINVAL);
+  return -1;
+}
+stub_warning (ioperm)
+weak_alias (_ioperm, ioperm)
+
+
+int
+_iopl (unsigned int level)
+{
+  __set_errno (EINVAL);
+  return -1;
+}
+stub_warning (iopl)
+weak_alias (_iopl, iopl)
+
+
+/* All the functions below should theoretically generate a segmentation
+   fault as ioperm and iopl always fail.  We don't simulate that.  */
+void
+_outb (unsigned char b, unsigned long int port)
+{
+}
+stub_warning (outb)
+weak_alias (_outb, outb)
+
+
+void
+_outw (unsigned short b, unsigned long int port)
+{
+}
+stub_warning (outw)
+weak_alias (_outw, outw)
+
+
+void
+_outl (unsigned int b, unsigned long int port)
+{
+}
+stub_warning (outl)
+weak_alias (_outl, outl)
+
+
+unsigned int
+_inb (unsigned long int port)
+{
+  return 0;
+}
+stub_warning (inb)
+weak_alias (_inb, inb);
+
+
+unsigned int
+_inw (unsigned long int port)
+{
+  return 0;
+}
+stub_warning (inw)
+weak_alias (_inw, inw);
+
+
+unsigned int
+_inl (unsigned long int port)
+{
+  return 0;
+}
+stub_warning (inl)
+weak_alias (_inl, inl);
diff --git a/sysdeps/unix/sysv/linux/arm/armv6/Implies b/sysdeps/unix/sysv/linux/arm/armv6/Implies
new file mode 100644
index 0000000..15a7e3d
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/arm/armv6/Implies
@@ -0,0 +1,2 @@
+# We can do everything that 5 can
+unix/sysv/linux/arm/armv5
diff --git a/sysdeps/unix/sysv/linux/arm/armv6t2/Implies b/sysdeps/unix/sysv/linux/arm/armv6t2/Implies
new file mode 100644
index 0000000..d256156
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/arm/armv6t2/Implies
@@ -0,0 +1,2 @@
+# We can do everything that 6 can
+unix/sysv/linux/arm/armv6
diff --git a/sysdeps/unix/sysv/linux/arm/armv7/Implies b/sysdeps/unix/sysv/linux/arm/armv7/Implies
new file mode 100644
index 0000000..a7ce12a
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/arm/armv7/Implies
@@ -0,0 +1,2 @@
+# We can do everything that 6T2 can
+unix/sysv/linux/arm/armv6t2
-- 
2.6.3