Beginning with the upcoming 4.1 release, Linux on a subset of 32-bit
ARM hardware will provide fast user-space implementations of the
following system calls:
- gettimeofday
- clock_gettime
The kernel implementation depends on the ARMv7 Generic Timers
Extension to accelerate these system calls. So CPUs such as
Cortex-A15 and -A7 benefit, while Cortex-A9, -A8, and pre-v7 CPUs do
not. On systems where the VDSO does not provide any speedup, the
kernel prevents the relevant symbol lookups from succeeding.
On OMAP5 (Cortex-A15) gettimeofday latency decreases from ~350ns to
~120ns. On BeagleBone Black (Cortex-A8) it goes from ~650ns to
~660ns, which to my mind is an acceptable cost.
Verified that no new test failures are introduced on kernels with and
without the VDSO.
* sysdeps/unix/sysv/linux/arm/Makefile: (sysdep_routines):
Include dl-vdso.
* sysdeps/unix/sysv/linux/arm/init-first.c: New file:
Use VDSO routines for gettimeofday, clock_gettime if
available.
* sysdeps/unix/sysv/linux/arm/libc-vdso.h: New file:
Declare VDSO symbols.
* sysdeps/unix/sysv/linux/arm/sysdep.h:
[HAVE_GETTIMEOFDAY_VSYSCALL]: Define.
[HAVE_CLOCK_GETTIME_VSYSCALL]: Define.
* sysdeps/unix/sysv/linux/arm/Versions: Add
__vdso_clock_gettime.
This patch eliminates the mixture of SONAME information in
shlib-versions files and SONAME information used to generate
gnu/lib-names.h in makefiles, with the information in the makefiles
being removed so all this information comes from the shlib-versions
files.
So that gnu/lib-names.h supports multiple ABIs, it is changed to be
generated on the same basis as gnu/stubs.h: when there are multiple
ABIs, gnu/lib-names.h is a wrapper header (the same header installed
whatever ABI is being built) and separate headers such as
gnu/lib-names-64.h contain the substantive contents (only one such
header being installed by any glibc build).
The rules for building gnu/lib-names.h were moved from Makeconfig to
Makerules because they need to come after sysdeps makefiles are
included (now that "ifndef abi-variants" is a toplevel conditional on
the rules rather than $(abi-variants) being evaluated later inside the
commands for a rule).
Tested for x86_64 and x86 that the installed shared libraries are
unchanged by this patch, and examined the installed gnu/lib-names*.h
headers by hand. Also tested the case of a single ABI (where there is
just a single header installed, again like stubs.h) by hacking
abi-variants to empty for x86_64.
[BZ #14171]
* Makeconfig [$(build-shared) = yes]
($(common-objpfx)soversions.mk): Don't handle SONAMEs specified in
makefiles.
[$(build-shared) = yes && $(soversions.mk-done) = t]
($(common-objpfx)gnu/lib-names.h): Remove rule.
[$(build-shared) = yes && $(soversions.mk-done) = t]
($(common-objpfx)gnu/lib-names.stmp): Likewise. Split and moved
to Makerules.
[$(build-shared) = yes && $(soversions.mk-done) = t]
(before-compile): Don't append $(common-objpfx)gnu/lib-names.h
here.
[$(build-shared) = yes && $(soversions.mk-done) = t]
(common-generated): Don't append gnu/lib-names.h and
gnu/lib-names.stmp here.
* Makerules [$(build-shared) = yes && $(soversions.mk-done) = t]
(lib-names-h-abi): New variable.
[$(build-shared) = yes && $(soversions.mk-done) = t]
(lib-names-stmp-abi): Likewise.
[$(build-shared) = yes && $(soversions.mk-done) = t &&
abi-variants] (before-compile): Append
$(common-objpfx)$(lib-names-h-abi).
[$(build-shared) = yes && $(soversions.mk-done) = t &&
abi-variants] (common-generated): Append gnu/lib-names.h.
[$(build-shared) = yes && $(soversions.mk-done) = t &&
abi-variants] (install-others-nosubdir): Depend on
$(inst_includedir)/$(lib-names-h-abi).
[$(build-shared) = yes && $(soversions.mk-done) = t &&
abi-variants] ($(common-objpfx)gnu/lib-names.h): New rule.
[$(build-shared) = yes && $(soversions.mk-done) = t]
($(common-objpfx)$(lib-names-h-abi)): New rule.
[$(build-shared) = yes && $(soversions.mk-done) = t]
($(common-objpfx)$(lib-names-stmp-abi)): Likewise.
[$(build-shared) = yes && $(soversions.mk-done) = t]
(common-generated): Append $(lib-names-h-abi) and
$(lib-names-stmp-abi).
* scripts/lib-names.awk: Do not handle multi being set.
* sysdeps/unix/sysv/linux/aarch64/Makefile (abi-lp64-ld-soname):
Remove variable.
(abi-lp64_be-ld-soname): Likewise.
* sysdeps/unix/sysv/linux/arm/Makefile (abi-soft-ld-soname):
Likewise.
(abi-hard-ld-soname): Likewise.
* sysdeps/unix/sysv/linux/i386/shlib-versions: New file.
* sysdeps/unix/sysv/linux/mips/Makefile (abi-o32_soft-ld-soname):
Remove variable.
(abi-o32_hard-ld-soname): Likewise.
(abi-o32_soft_2008-ld-soname): Likewise.
(abi-o32_hard_2008-ld-soname): Likewise.
(abi-n32_soft-ld-soname): Likewise.
(abi-n32_hard-ld-soname): Likewise.
(abi-n32_soft_2008-ld-soname): Likewise.
(abi-n32_hard_2008-ld-soname): Likewise.
(abi-n64_soft-ld-soname): Likewise.
(abi-n64_hard-ld-soname): Likewise.
(abi-n64_soft_2008-ld-soname): Likewise.
(abi-n64_hard_2008-ld-soname): Likewise.
* sysdeps/unix/sysv/linux/powerpc/Makefile (abi-64-v1-ld-soname):
Likewise.
(abi-64-v2-ld-soname): Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/shlib-versions: Add
ld.so entries.
* sysdeps/unix/sysv/linux/s390/Makefile (abi-64-ld-soname): Remove
variable.
* sysdeps/unix/sysv/linux/s390/s390-64/shlib-versions: Add ld.so
entry.
* sysdeps/unix/sysv/linux/x86/Makefile (abi-32-ld-soname): Remove
variable.
(abi-64-ld-soname): Likewise.
(abi-x32-ld-soname): Likewise.
* sysdeps/unix/sysv/linux/x86_64/64/shlib-versions: Add ld.so
entry.
* sysdeps/unix/sysv/linux/x86_64/x32/shlib-versions: Likewise.
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.
2000-08-01 Philip Blundell <philb@gnu.org>
* sysdeps/unix/sysv/linux/arm/Makefile [subdir=resource]
(sysdep_routines): Add oldgetrlimit, oldsetrlimit.
* sysdeps/unix/sysv/linux/arm/syscalls.list: Add oldgetrlimit,
oldsetrlimit for GLIBC_2.0.
(LINE_PARSER): Allow any number of spaces between ip address and
number. Fixes PR libc/1833, reported by rp010gf@voruta.vu.lt.
* nis/nss_nisplus/nisplus-hosts.c (_nss_nisplus_getipnodebyname_r):
Likewise.
* Make-dist (dist): Resolve `..' in file names.
2000-01-23 Mark Kettenis <kettenis@gnu.org>
* inet/rexec.c (rexec_af): Use SA_LEN instead of __libc_sa_len.
2000-01-22 Thorsten Kukuk <kukuk@suse.de>
* sunrpc/xdr_rec.c: Don't set frag_sent if no more data,
fixes part 2 of bug 1549.
* sunrpc/rpc_des.h: Remove unused defines.
2000-01-22 Mark Kettenis <kettenis@gnu.org>
* intl/Makefile ($(objpfx)msgs.h): Do $(make-target-directory) first.
2000-01-22 Thorsten Kukuk <kukuk@suse.de>
* sysdeps/unix/sysv/linux/Makefile (sysdep_headers): Remove sys/io.h.
* sysdeps/unix/sysv/linux/alpha/Makefile: Add sys/io.h.
* sysdeps/unix/sysv/linux/arm/Makefile: Likewise.
* sysdeps/unix/sysv/linux/i386/Makefile: Likewise.
* sysdeps/unix/sysv/linux/sys/io.h: Move from here ...
* sysdeps/unix/sysv/linux/i386/sys/io.h: ... to here, add inb, outb
and other inline functions for port access.
* sysdeps/unix/sysv/linux/alpha/sys/io.h: Add prototypes for port
access functions.
2000-01-23 Ulrich Drepper <drepper@cygnus.com>
* iconv/gconv_simple.c: Fix two problems in UTF-8 decoder.
Patch by Bruno Haibe <haible@ilog.fr>.
1999-04-12 Philip Blundell <philb@gnu.org>
* elf/elf.h: Update ARM definitions to match current gas2.
* sysdeps/arm/bits/endian.h: Support big endian operation.
* sysdeps/unix/sysv/linux/arm/ioperm.c (_outw, _outb, _outl):
Don't bother range checking the port number.
* sysdeps/unix/sysv/linux/arm/vfork.S: New file.
* sysdeps/unix/sysv/linux/arm/sysdep.h (INLINE_SYSCALL): Include
the syscall name in assembler output for ease of debugging.
* sysdeps/unix/sysv/linux/arm/sigaction.c: Don't rely on undefined
compiler behaviour.
* sysdeps/unix/sysv/linux/arm/sigrestorer.S: New file.
* sysdeps/unix/sysv/linux/arm/Makefile [$(subdir) = signal]
(sysdep_routines): Add sigrestorer.
* string/tester.c (test_strcpy): Add new tests for unaligned
arguments.
* sysdeps/arm/bits/string.h: Delete inline implementations of
strcpy and stpcpy.
* sysdeps/unix/opendir.c: Use O_DIRECTORY if available. If not
available double check to verify it's a directory.
* sysdeps/unix/sysv/linux/alpha/bits/fcntl.h: Add O_DIRECTORY.
* sysdeps/unix/sysv/linux/mips/bits/fcntl: Likewise.
* sysdeps/unix/sysv/linux/bits/fcntl.h: Remove O_* constants which
are not generally available.
* sysdeps/unix/sysv/linux/i386/bits/fcntl.h: New file.
* sysdeps/unix/sysv/linux/i386/setgroups.c: Add range check for values.
* sysdeps/unix/sysv/linux/arm/Makefile: New file.
* sysdeps/unix/sysv/linux/arm/setegid.c: New file.
* sysdeps/unix/sysv/linux/arm/seteuid.c: New file.
* sysdeps/unix/sysv/linux/arm/setfsgid.c: New file.
* sysdeps/unix/sysv/linux/arm/setfsuid.c: New file.
* sysdeps/unix/sysv/linux/arm/setgid.c: New file.
* sysdeps/unix/sysv/linux/arm/setgroups.c: New file.
* sysdeps/unix/sysv/linux/arm/setresgid.c: New file.
* sysdeps/unix/sysv/linux/arm/setresuid.c: New file.
* sysdeps/unix/sysv/linux/arm/setuid.c: New file.
* sysdeps/unix/sysv/linux/i386/setegid.c: New file.
* sysdeps/unix/sysv/linux/i386/seteuid.c: New file.
* sysdeps/unix/sysv/linux/i386/setfsgid.c: New file.
* sysdeps/unix/sysv/linux/i386/setfsuid.c: New file.
* sysdeps/unix/sysv/linux/i386/setgid.c: New file.
* sysdeps/unix/sysv/linux/i386/setgroups.c: New file.
* sysdeps/unix/sysv/linux/i386/setresgid.c: New file.
* sysdeps/unix/sysv/linux/i386/setresuid.c: New file.
* sysdeps/unix/sysv/linux/i386/setuid.c: New file.
* sysdeps/unix/sysv/linux/m68k/setegid.c: New file.
* sysdeps/unix/sysv/linux/m68k/seteuid.c: New file.
* sysdeps/unix/sysv/linux/m68k/setfsgid.c: New file.
* sysdeps/unix/sysv/linux/m68k/setfsuid.c: New file.
* sysdeps/unix/sysv/linux/m68k/setgid.c: New file.
* sysdeps/unix/sysv/linux/m68k/setgroups.c: New file.
* sysdeps/unix/sysv/linux/m68k/setresgid.c: New file.
* sysdeps/unix/sysv/linux/m68k/setresuid.c: New file.
* sysdeps/unix/sysv/linux/m68k/setuid.c: New file.
* sysdeps/unix/sysv/linux/sparc/sparc32/setegid.c: New file.
* sysdeps/unix/sysv/linux/sparc/sparc32/seteuid.c: New file.
* sysdeps/unix/sysv/linux/sparc/sparc32/setfsgid.c: New file.
* sysdeps/unix/sysv/linux/sparc/sparc32/setfsuid.c: New file.
* sysdeps/unix/sysv/linux/sparc/sparc32/setgid.c: New file.
* sysdeps/unix/sysv/linux/sparc/sparc32/setgroups.c: New file.
* sysdeps/unix/sysv/linux/sparc/sparc32/setresgid.c: New file.
* sysdeps/unix/sysv/linux/sparc/sparc32/setresuid.c: New file.
* sysdeps/unix/sysv/linux/sparc/sparc32/setuid.c: New file.
* sysdeps/unix/sysv/linux/arm/syscalls.list: Add s_setgid, s_setresuid,
s_setresgid, and s_setuid.
* sysdeps/unix/sysv/linux/i386/syscalls.list: Likewise.
* sysdeps/unix/sysv/linux/m68k/syscalls.list: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/syscalls.list: Likewise.
* sysdeps/unix/sysv/linux/i386/Makefile [subdir=misc]
(sysdep_routines): Add setfsgid, setfsuid, setresgid, and setresuid.
* sysdeps/unix/sysv/linux/m68k/Makefile: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/Makefile: Likewise.
1998-10-16 Ulrich Drepper <drepper@cygnus.com>
* iconv/skeleton.c: Include ELF header only of STATIC_GCONV is not
