Move arm from ports to libc.

I've moved the ARM port from ports to the main sysdeps hierarchy.
Beyond the README update, the move of the files was simply

git mv ports/sysdeps/arm sysdeps/arm
git mv ports/sysdeps/unix/arm sysdeps/unix/arm
git mv ports/sysdeps/unix/sysv/linux/arm sysdeps/unix/sysv/linux/arm

and in addition to the ChangeLog entries here, I put a note at the top
of ports/ChangeLog.arm similar to that at the top of
ChangeLog.powerpc.  There is deliberately no NEWS change, as I think
it makes the most sense to put in a general note above all ports
having moved if we can achieve that for 2.20.

Tested that disassembly of installed shared libraries for arm is the
same before and after this patch, except for data (not instructions)
in ld.so (there are assertions in sysdeps/arm/dl-machine.h, and the
path by which that file is found, and so by which it appears in the
assertion message, changes as a result of the move).

	* sysdeps/arm: Move directory from ports/sysdeps/arm.
	* sysdeps/unix/arm: Move directory from ports/sysdeps/unix/arm.
	* sysdeps/unix/sysv/linux/arm: Move directory from
	ports/sysdeps/unix/sysv/linux/arm.
	* README: Update listing for arm-*-linux-gnueabi.

ports/ChangeLog.arm:
	* sysdeps/arm: Move directory to ../sysdeps/arm.
	* sysdeps/unix/arm: Move directory to ../sysdeps.arm.
	* sysdeps/unix/sysv/linux/arm: Move directory to
	../sysdeps/unix/sysv/linux/arm.

1 files changed, 279 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/arm/ioperm.c b/sysdeps/unix/sysv/linux/arm/ioperm.c
new file mode 100644
index 0000000000..19b79f4bc6
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/arm/ioperm.c
@@ -0,0 +1,279 @@
+/* Copyright (C) 1998-2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Phil Blundell, based on the Alpha version by
+   David Mosberger.
+
+   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/>.  */
+
+/* I/O port access on the ARM is something of a fiction.  What we do is to
+   map an appropriate area of /dev/mem into user space so that a program
+   can blast away at the hardware in such a way as to generate I/O cycles
+   on the bus.  To insulate user code from dependencies on particular
+   hardware we don't allow calls to inb() and friends to be inlined, but
+   force them to come through code in here every time.  Performance-critical
+   registers tend to be memory mapped these days so this should be no big
+   problem.  */
+
+/* Once upon a time this file used mprotect to enable and disable
+   access to particular areas of I/O space.  Unfortunately the
+   mprotect syscall also has the side effect of enabling caching for
+   the area affected (this is a kernel limitation).  So we now just
+   enable all the ports all of the time.  */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/mman.h>
+
+#include <linux/version.h>
+#include <sys/sysctl.h>
+
+#define PATH_ARM_SYSTYPE	"/etc/arm_systype"
+#define PATH_CPUINFO		"/proc/cpuinfo"
+
+#define MAX_PORT	0x10000
+
+static struct {
+  unsigned long int	base;
+  unsigned long int	io_base;
+  unsigned int		shift;
+  unsigned int		initdone;	/* since all the above could be 0 */
+} io;
+
+#define IO_BASE_FOOTBRIDGE	0x7c000000
+#define IO_SHIFT_FOOTBRIDGE	0
+
+static struct platform {
+  const char		*name;
+  unsigned long int	io_base;
+  unsigned int		shift;
+} platform[] = {
+  /* All currently supported platforms are in fact the same. :-)  */
+  {"Chalice-CATS",	IO_BASE_FOOTBRIDGE,	IO_SHIFT_FOOTBRIDGE},
+  {"DEC-EBSA285",	IO_BASE_FOOTBRIDGE,	IO_SHIFT_FOOTBRIDGE},
+  {"Corel-NetWinder",	IO_BASE_FOOTBRIDGE,	IO_SHIFT_FOOTBRIDGE},
+  {"Rebel-NetWinder",	IO_BASE_FOOTBRIDGE,	IO_SHIFT_FOOTBRIDGE},
+};
+
+#define IO_ADDR(port)	(io.base + ((port) << io.shift))
+
+/*
+ * Initialize I/O system.  There are several ways to get the information
+ * we need.  Each is tried in turn until one succeeds.
+ *
+ * 1. Sysctl (CTL_BUS, CTL_BUS_ISA, ISA_*).  This is the preferred method
+ *    but not all kernels support it.
+ *
+ * 2. Read the value (not the contents) of symlink PATH_ARM_SYSTYPE.
+ *    - If it matches one of the entries in the table above, use the
+ *      corresponding values.
+ *    - If it begins with a number, assume this is a previously
+ *      unsupported system and the values encode, in order,
+ *      "<io_base>,<port_shift>".
+ *
+ * 3. Lookup the "system type" field in /proc/cpuinfo.  Again, if it
+ *    matches an entry in the platform[] table, use the corresponding
+ *    values.
+ */
+
+/* The Linux kernel headers renamed this constant between 2.5.26 and
+   2.5.27.  It was backported to 2.4 between 2.4.22 and 2.4.23.  */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,23)
+# define BUS_ISA CTL_BUS_ISA
+#endif
+
+static int
+init_iosys (void)
+{
+  char systype[256];
+  int i, n;
+  static int iobase_name[] = { CTL_BUS, BUS_ISA, BUS_ISA_PORT_BASE };
+  static int ioshift_name[] = { CTL_BUS, BUS_ISA, BUS_ISA_PORT_SHIFT };
+  size_t len = sizeof(io.base);
+
+  if (! __sysctl (iobase_name, 3, &io.io_base, &len, NULL, 0)
+      && ! __sysctl (ioshift_name, 3, &io.shift, &len, NULL, 0))
+    {
+      io.initdone = 1;
+      return 0;
+    }
+
+  n = __readlink (PATH_ARM_SYSTYPE, systype, sizeof (systype) - 1);
+  if (n > 0)
+    {
+      systype[n] = '\0';
+      if (isdigit (systype[0]))
+	{
+	  if (sscanf (systype, "%li,%i", &io.io_base, &io.shift) == 2)
+	    {
+	      io.initdone = 1;
+	      return 0;
+	    }
+	  /* else we're likely going to fail with the system match below */
+	}
+    }
+  else
+    {
+      FILE * fp;
+
+      fp = fopen (PATH_CPUINFO, "rce");
+      if (! fp)
+	return -1;
+      while ((n = fscanf (fp, "Hardware\t: %256[^\n]\n", systype))
+	     != EOF)
+	{
+	  if (n == 1)
+	    break;
+	  else
+	    fgets_unlocked (systype, 256, fp);
+	}
+      fclose (fp);
+
+      if (n == EOF)
+	{
+	  /* this can happen if the format of /proc/cpuinfo changes...  */
+	  fprintf (stderr,
+		   "ioperm: Unable to determine system type.\n"
+		   "\t(May need " PATH_ARM_SYSTYPE " symlink?)\n");
+	  __set_errno (ENODEV);
+	  return -1;
+	}
+    }
+
+  /* translate systype name into i/o system: */
+  for (i = 0; i < sizeof (platform) / sizeof (platform[0]); ++i)
+    {
+      if (strcmp (platform[i].name, systype) == 0)
+	{
+	  io.shift = platform[i].shift;
+	  io.io_base = platform[i].io_base;
+	  io.initdone = 1;
+	  return 0;
+	}
+    }
+
+  /* systype is not a known platform name... */
+  __set_errno (ENODEV);
+  return -1;
+}
+
+int
+_ioperm (unsigned long int from, unsigned long int num, int turn_on)
+{
+  if (! io.initdone && init_iosys () < 0)
+    return -1;
+
+  /* this test isn't as silly as it may look like; consider overflows! */
+  if (from >= MAX_PORT || from + num > MAX_PORT)
+    {
+      __set_errno (EINVAL);
+      return -1;
+    }
+
+  if (turn_on)
+    {
+      if (! io.base)
+	{
+	  int fd;
+
+	  fd = __open ("/dev/mem", O_RDWR);
+	  if (fd < 0)
+	    return -1;
+
+	  io.base =
+	    (unsigned long int) __mmap (0, MAX_PORT << io.shift,
+					PROT_READ | PROT_WRITE,
+					MAP_SHARED, fd, io.io_base);
+	  __close (fd);
+	  if ((long) io.base == -1)
+	    return -1;
+	}
+    }
+
+  return 0;
+}
+
+
+int
+_iopl (unsigned int level)
+{
+    if (level > 3)
+      {
+	__set_errno (EINVAL);
+	return -1;
+      }
+    if (level)
+      {
+	return _ioperm (0, MAX_PORT, 1);
+      }
+    return 0;
+}
+
+
+void
+_outb (unsigned char b, unsigned long int port)
+{
+  *((volatile unsigned char *)(IO_ADDR (port))) = b;
+}
+
+
+void
+_outw (unsigned short b, unsigned long int port)
+{
+  *((volatile unsigned short *)(IO_ADDR (port))) = b;
+}
+
+
+void
+_outl (unsigned int b, unsigned long int port)
+{
+  *((volatile unsigned long *)(IO_ADDR (port))) = b;
+}
+
+
+unsigned int
+_inb (unsigned long int port)
+{
+  return *((volatile unsigned char *)(IO_ADDR (port)));
+}
+
+
+unsigned int
+_inw (unsigned long int port)
+{
+  return *((volatile unsigned short *)(IO_ADDR (port)));
+}
+
+
+unsigned int
+_inl (unsigned long int port)
+{
+  return *((volatile unsigned long *)(IO_ADDR (port)));
+}
+
+weak_alias (_ioperm, ioperm);
+weak_alias (_iopl, iopl);
+weak_alias (_inb, inb);
+weak_alias (_inw, inw);
+weak_alias (_inl, inl);
+weak_alias (_outb, outb);
+weak_alias (_outw, outw);
+weak_alias (_outl, outl);