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arm: Remove ioperm/iopl/inb/inw/inl/outb/outw/outl support
Linux only supports the required ISA sysctls on StrongARM devices, which are armv4 and no longer tested during glibc development and probably bit-rotted by this point. (No reported test results, and the last discussion of armv4 support was in the glibc 2.19 release notes.)
This commit is contained in:
Florian Weimer
parent
0bb8f8c791
commit
6b33f373c7
10
ChangeLog
10
ChangeLog
@ -1,3 +1,13 @@
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2019-05-29 Florian Weimer <fweimer@redhat.com>
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arm: Remove ioperm/iopl/inb/inw/inl/outb/outw/outl support.
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* sysdeps/unix/sysv/linux/arm/Makefile
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[$(subdir) == misc] (sysdep_headers): Remove sys/io.h.
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* sysdeps/unix/sysv/linux/arm/sys/io.h: Remove file.
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* sysdeps/unix/sysv/linux/arm/ioperm.c: Rewrite file.
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(ioperm, iopl, inb, inw, inl, outb, outw, outl): Turn into
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compatibility symbols.
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2019-05-31 Florian Weimer <fweimer@redhat.com>
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* sysdeps/unix/sysv/linux/syscall-names.list: Add oddly named
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3
NEWS
3
NEWS
@ -58,6 +58,9 @@ Deprecated and removed features, and other changes affecting compatibility:
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configurations) has been removed, following the deprecation of this
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subarchitecture in version 8 of GCC, and its removal in version 9.
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* On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
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header have been removed.
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Changes to build and runtime requirements:
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* GCC 6.2 or later is required to build the GNU C Library.
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@ -5,7 +5,7 @@ endif
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ifeq ($(subdir),misc)
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sysdep_routines += ioperm
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sysdep_headers += sys/elf.h sys/io.h
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sysdep_headers += sys/elf.h
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endif
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ifeq ($(subdir),signal)
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@ -17,167 +17,71 @@
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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/* I/O port access on the ARM is something of a fiction. What we do is to
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map an appropriate area of /dev/mem into user space so that a program
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can blast away at the hardware in such a way as to generate I/O cycles
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on the bus. To insulate user code from dependencies on particular
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hardware we don't allow calls to inb() and friends to be inlined, but
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force them to come through code in here every time. Performance-critical
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registers tend to be memory mapped these days so this should be no big
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problem. */
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#include <shlib-compat.h>
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/* Once upon a time this file used mprotect to enable and disable
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access to particular areas of I/O space. Unfortunately the
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mprotect syscall also has the side effect of enabling caching for
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the area affected (this is a kernel limitation). So we now just
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enable all the ports all of the time. */
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#if SHLIB_COMPAT (libc, GLIBC_2_4, GLIBC_2_30)
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# include <errno.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sys/sysctl.h>
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#define MAX_PORT 0x10000
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static struct {
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unsigned long int base;
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unsigned long int io_base;
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unsigned int shift;
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unsigned int initdone; /* since all the above could be 0 */
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} io;
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#define IO_ADDR(port) (io.base + ((port) << io.shift))
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/*
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* Initialize I/O system. The io_bae and port_shift values are fetched
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* using sysctl (CTL_BUS, CTL_BUS_ISA, ISA_*).
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*/
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static int
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init_iosys (void)
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int
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ioperm (unsigned long int from, unsigned long int num, int turn_on)
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{
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static int iobase_name[] = { CTL_BUS, CTL_BUS_ISA, BUS_ISA_PORT_BASE };
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static int ioshift_name[] = { CTL_BUS, CTL_BUS_ISA, BUS_ISA_PORT_SHIFT };
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size_t len = sizeof (io.base);
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if (! __sysctl (iobase_name, 3, &io.io_base, &len, NULL, 0)
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&& ! __sysctl (ioshift_name, 3, &io.shift, &len, NULL, 0))
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{
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io.initdone = 1;
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return 0;
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}
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/* sysctl has failed... */
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__set_errno (ENODEV);
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__set_errno (ENOSYS);
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return -1;
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}
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compat_symbol (libc, ioperm, ioperm, GLIBC_2_4);
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int
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_ioperm (unsigned long int from, unsigned long int num, int turn_on)
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iopl (unsigned int level)
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{
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if (! io.initdone && init_iosys () < 0)
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return -1;
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__set_errno (ENOSYS);
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return -1;
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}
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compat_symbol (libc, iopl, iopl, GLIBC_2_4);
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/* this test isn't as silly as it may look like; consider overflows! */
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if (from >= MAX_PORT || from + num > MAX_PORT)
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{
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__set_errno (EINVAL);
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return -1;
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}
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if (turn_on)
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{
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if (! io.base)
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{
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int fd;
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/* The remaining functions do not have any way to indicate failure.
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However, it is only valid to call them after calling ioperm/iopl,
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which will have indicated failure. */
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fd = __open ("/dev/mem", O_RDWR);
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if (fd < 0)
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return -1;
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void
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outb (unsigned char b, unsigned long int port)
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{
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}
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compat_symbol (libc, outb, outb, GLIBC_2_4);
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io.base =
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(unsigned long int) __mmap (0, MAX_PORT << io.shift,
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PROT_READ | PROT_WRITE,
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MAP_SHARED, fd, io.io_base);
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__close (fd);
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if ((long) io.base == -1)
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return -1;
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}
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}
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void
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outw (unsigned short b, unsigned long int port)
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{
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}
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compat_symbol (libc, outw, outw, GLIBC_2_4);
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void
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outl (unsigned int b, unsigned long int port)
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{
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}
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compat_symbol (libc, outl, outl, GLIBC_2_4);
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unsigned int
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inb (unsigned long int port)
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{
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return 0;
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}
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int
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_iopl (unsigned int level)
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{
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if (level > 3)
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{
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__set_errno (EINVAL);
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return -1;
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}
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if (level)
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{
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return _ioperm (0, MAX_PORT, 1);
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}
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return 0;
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}
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void
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_outb (unsigned char b, unsigned long int port)
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{
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*((volatile unsigned char *)(IO_ADDR (port))) = b;
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}
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void
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_outw (unsigned short b, unsigned long int port)
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{
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*((volatile unsigned short *)(IO_ADDR (port))) = b;
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}
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void
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_outl (unsigned int b, unsigned long int port)
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{
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*((volatile unsigned long *)(IO_ADDR (port))) = b;
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}
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compat_symbol (libc, inb, inb, GLIBC_2_4);
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unsigned int
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_inb (unsigned long int port)
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inw (unsigned long int port)
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{
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return *((volatile unsigned char *)(IO_ADDR (port)));
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return 0;
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}
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compat_symbol (libc, inw, inw, GLIBC_2_4);
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unsigned int
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_inw (unsigned long int port)
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inl (unsigned long int port)
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{
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return *((volatile unsigned short *)(IO_ADDR (port)));
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return 0;
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}
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compat_symbol (libc, inl, inl, GLIBC_2_4);
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unsigned int
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_inl (unsigned long int port)
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{
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return *((volatile unsigned long *)(IO_ADDR (port)));
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}
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weak_alias (_ioperm, ioperm);
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weak_alias (_iopl, iopl);
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weak_alias (_inb, inb);
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weak_alias (_inw, inw);
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weak_alias (_inl, inl);
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weak_alias (_outb, outb);
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weak_alias (_outw, outw);
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weak_alias (_outl, outl);
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#endif /* SHLIB_COMAT */
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@ -1,47 +0,0 @@
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/* Copyright (C) 1996-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _SYS_IO_H
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#define _SYS_IO_H 1
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#include <features.h>
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__BEGIN_DECLS
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/* If TURN_ON is TRUE, request for permission to do direct i/o on the
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port numbers in the range [FROM,FROM+NUM-1]. Otherwise, turn I/O
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permission off for that range. This call requires root privileges. */
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extern int ioperm (unsigned long int __from, unsigned long int __num,
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int __turn_on) __THROW;
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/* Set the I/O privilege level to LEVEL. If LEVEL is nonzero,
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permission to access any I/O port is granted. This call requires
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root privileges. */
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extern int iopl (int __level) __THROW;
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/* The functions that actually perform reads and writes. */
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extern unsigned char inb (unsigned long int __port) __THROW;
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extern unsigned short int inw (unsigned long int __port) __THROW;
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extern unsigned long int inl (unsigned long int __port) __THROW;
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extern void outb (unsigned char __value, unsigned long int __port) __THROW;
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extern void outw (unsigned short __value, unsigned long int __port) __THROW;
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extern void outl (unsigned long __value, unsigned long int __port) __THROW;
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__END_DECLS
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#endif /* _SYS_IO_H */
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