openwrtv4/toolchain/musl/patches/001-git-2015-07-22.patch

commit 3975577922aedab7d60788dd320a2c8e4e94bc6e
Author: Roman Yeryomin <roman@ubnt.com>
Date:   Thu Jul 2 12:29:00 2015 +0300

    socket.h: cleanup/reorder mips and powerpc bits/socket.h
    
    ....to be somewhat consistent and easily comparable with asm/socket.h
    
    Signed-off-by: Roman Yeryomin <roman@ubnt.com>

commit 29ec7677a73a5227badbb1064205be09e707e466
Author: Roman Yeryomin <roman@ubnt.com>
Date:   Thu Jul 2 12:28:41 2015 +0300

    socket.h: fix SO_* for mips
    
    Signed-off-by: Roman Yeryomin <roman@ubnt.com>

commit 3fffa7a658aa925b8f95d36aef7531c1827dbf28
Author: Felix Fietkau <nbd@openwrt.org>
Date:   Tue Jul 21 15:01:25 2015 +0200

    mips: fix mcontext_t register array field name
    
    glibc and uclibc use gregs instead of regs
    
    Signed-off-by: Felix Fietkau <nbd@openwrt.org>

commit 0f9c2666aca95eb98eb0ef4f4d8d1473c8ce3fa0
Author: Rich Felker <dalias@aerifal.cx>
Date:   Thu Jul 9 18:36:02 2015 +0000

    handle loss of syslog socket connection
    
    when traditional syslogd implementations are restarted, the old server
    socket ceases to exist and a new unix socket with the same pathname is
    created. when this happens, the default destination address associated
    with the client socket via connect is no longer valid, and attempts to
    send produce errors. this happens despite the socket being datagram
    type, and is in contrast to the behavior that would be seen with an IP
    datagram (UDP) socket.
    
    in order to avoid a situation where the application is unable to send
    further syslog messages without calling closelog, this patch makes
    syslog attempt to reconnect the socket when send returns an error
    indicating a lost connection.
    
    additionally, initial failure to connect the socket no longer results
    in the socket being closed. this ensures that an application which
    calls openlog to reserve the socket file descriptor will not run into
    a situation where transient connection failure (e.g. due to syslogd
    restart) prevents fd reservation. however, applications which may be
    unable to connect the socket later (e.g. due to chroot, restricted
    permissions, seccomp, etc.) will still fail to log if the syslog
    socket cannot be connected at openlog time or if it has to be
    reconnected later.

commit 11894f6d3a80be950a490dc7dfab349f057a545f
Author: Rich Felker <dalias@aerifal.cx>
Date:   Thu Jul 9 17:07:35 2015 +0000

    fix incorrect void return type for syncfs function
    
    being nonstandard, the closest thing to a specification for this
    function is its man page, which documents it as returning int. it can
    fail with EBADF if the file descriptor passed is invalid.

commit e8cbe0bad4284906230a53af4c91ad2b9713d03b
Author: Rich Felker <dalias@aerifal.cx>
Date:   Wed Jul 8 02:46:45 2015 +0000

    fix negated return value of ns_skiprr, breakage in related functions
    
    due to a reversed pointer difference computation, ns_skiprr always
    returned a negative value, which functions using it would interpret as
    an error.
    
    patch by Yu Lu.

commit fb58545f8d1c5fa32122244caeaf3625c12ddc01
Author: Shiz <hi@shiz.me>
Date:   Sun Jun 28 23:08:21 2015 +0200

    add musl-clang, a wrapper for system clang installs
    
    musl-clang allows the user to compile musl-powered programs using their
    already existent clang install, without the need of a special cross compiler.
    it achieves this by wrapping around both the system clang install and the
    linker and passing them special flags to re-target musl at runtime.
    it does only affect invocations done through the special musl-clang wrapper
    script, so that the user setup remains fully intact otherwise.
    
    the clang wrapper consists of the compiler frontend wrapper script,
    musl-clang, and the linker wrapper script, ld.musl-clang.
    musl-clang makes sure clang invokes ld.musl-clang to link objects; neither
    script needs to be in PATH for the wrapper to work.

commit f8db6f74b2c74a50c4dec7e30be5215f0e2c37a6
Author: Shiz <hi@shiz.me>
Date:   Sun Jun 28 23:08:20 2015 +0200

    build: fix musl-targeting toolchain test
    
    the old test was broken in that it would never fail on a toolchains built
    without dynamic linking support, leading to the wrapper script possibly being
    installed on compilers that do not support it. in addition, the new test is
    portable across compilers: the old test only worked on GCC.
    
    the new test works by testing whether the toolchain libc defines __GLIBC__:
    most non-musl Linux libc's do define this for compatibility even when they
    are not glibc, so this is a safe bet to check for musl. in addition, the
    compiler runtime would need to have a somewhat glibc-compatible ABI in the
    first place, so any non-glibc compatible libc's compiler runtime might not
    work. it is safer to disable these cases by default and have the user enable
    the wrappers manually there using --enable-wrapper if they certain it works.

commit b3cd7d13fe630ba1847326242525298e361018c1
Author: Shiz <hi@shiz.me>
Date:   Sun Jun 28 23:08:19 2015 +0200

    build: overhaul wrapper script system for multiple wrapper support
    
    this overhauls part of the build system in order to support multiple
    toolchain wrapper scripts, as opposed to solely the musl-gcc wrapper as
    before. it thereby replaces --enable-gcc-wrapper with --enable-wrapper=...,
    which has the options 'auto' (the default, detect whether to use wrappers),
    'all' (build and install all wrappers), 'no' (don't build any) and finally
    the options named after the individual compiler scripts (currently only
    'gcc' is available) to build and install only that wrapper.
    the old --enable-gcc-wrapper is removed from --help, but still available.
    
    it also modifies the wrappers to use the C compiler specified to the build
    system as 'inner' compiler, when applicable. as wrapper detection works by
    probing this compiler, it may not work with any other.

commit 2a780aa3050b86d888489361f04220bfb58890a1
Author: Rich Felker <dalias@aerifal.cx>
Date:   Mon Jul 6 22:13:11 2015 +0000

    treat empty TZ environment variable as GMT rather than default
    
    this improves compatibility with the behavior of other systems and
    with some applications which set an empty TZ var to disable use of
    local time by mktime, etc.

commit 8f08a58c635bea5cdfae6bc0e323c80aa9ff82a7
Author: Alexander Monakov <amonakov@ispras.ru>
Date:   Sun Jun 28 02:48:33 2015 +0300

    dynlink.c: pass gnu-hash table pointer to gnu_lookup
    
    The callers need to check the value of the pointer anyway, so make
    them pass the pointer to gnu_lookup instead of reloading it there.
    
    Reorder gnu_lookup arguments so that always-used ones are listed
    first. GCC can choose a calling convention with arguments in registers
    (e.g. up to 3 arguments in eax, ecx, edx on x86), but cannot reorder
    the arguments for static functions.

commit 5b4286e12cd6baac343b10a41dc17ac578832089
Author: Alexander Monakov <amonakov@ispras.ru>
Date:   Sun Jun 28 02:48:32 2015 +0300

    dynlink.c: slim down gnu_lookup
    
    Do not reference dso->syms and dso->strings until point of use.
    Check 'h1 == (h2|1)', the simplest condition, before the others.

commit 84389c64562e2b2ba43225b5b7a9df7d974479b1
Author: Alexander Monakov <amonakov@ispras.ru>
Date:   Sun Jun 28 02:48:31 2015 +0300

    dynlink.c: use bloom filter in gnu hash lookup
    
    Introduce gnu_lookup_filtered and use it to speed up symbol lookups in
    find_sym (do_dlsym is left as is, based on an expectation that
    frequently dlsym queries will use a dlopen handle rather than
    RTLD_NEXT or RTLD_DEFAULT, and will not need to look at more than one
    DSO).

commit 66d45787c865a1807ae397a89a14699394ed4fa4
Author: Alexander Monakov <amonakov@ispras.ru>
Date:   Sun Jun 28 02:48:30 2015 +0300

    dynlink.c: use a faster expression in gnu_hash
    
    With -Os, GCC uses a multiply rather than a shift and addition for 'h*33'.
    Use a more efficient expression explicitely.

commit 6ba5517a460c6c438f64d69464fdfc3269a4c91a
Author: Rich Felker <dalias@aerifal.cx>
Date:   Thu Jun 25 22:22:00 2015 +0000

    fix local-dynamic model TLS on mips and powerpc
    
    the TLS ABI spec for mips, powerpc, and some other (presently
    unsupported) RISC archs has the return value of __tls_get_addr offset
    by +0x8000 and the result of DTPOFF relocations offset by -0x8000. I
    had previously assumed this part of the ABI was actually just an
    implementation detail, since the adjustments cancel out. however, when
    the local dynamic model is used for accessing TLS that's known to be
    in the same DSO, either of the following may happen:
    
    1. the -0x8000 offset may already be applied to the argument structure
    passed to __tls_get_addr at ld time, without any opportunity for
    runtime relocations.
    
    2. __tls_get_addr may be used with a zero offset argument to obtain a
    base address for the module's TLS, to which the caller then applies
    immediate offsets for individual objects accessed using the local
    dynamic model. since the immediate offsets have the -0x8000 adjustment
    applied to them, the base address they use needs to include the
    +0x8000 offset.
    
    it would be possible, but more complex, to store the pointers in the
    dtv[] array with the +0x8000 offset pre-applied, to avoid the runtime
    cost of adding 0x8000 on each call to __tls_get_addr. this change
    could be made later if measurements show that it would help.

commit ce337daa00e42d4f2d9a4d9ae0ed51b20249d924
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 23 04:03:42 2015 +0000

    make dynamic linker work around MAP_FAILED mmap failure on nommu kernels
    
    previously, loading of additional libraries beyond libc/ldso did not
    work on nommu kernels, nor did loading programs via invocation of the
    dynamic linker as a command.

commit a59341420fdedb288d9ff80e73609ae44e9cf258
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 23 00:12:25 2015 +0000

    reimplement strverscmp to fix corner cases
    
    this interface is non-standardized and is a GNU invention, and as
    such, our implementation should match the behavior of the GNU
    function. one peculiarity the old implementation got wrong was the
    handling of all-zero digit sequences: they are supposed to compare
    greater than digit sequences of which they are a proper prefix, as in
    009 < 00.
    
    in addition, high bytes were treated with char signedness rather than
    as unsigned. this was wrong regardless of what the GNU function does
    since the resulting order relation varied by arch.
    
    the new strverscmp implementation makes explicit the cases where the
    order differs from what strcmp would produce, of which there are only
    two.

commit 153e952e1a688859d7095345b17e6c1df74a295c
Author: Rich Felker <dalias@aerifal.cx>
Date:   Mon Jun 22 20:33:28 2015 +0000

    fix regression/typo that disabled __simple_malloc when calloc is used
    
    commit ba819787ee93ceae94efd274f7849e317c1bff58 introduced this
    regression. since the __malloc0 weak alias was not properly provided
    by __simple_malloc, use of calloc forced the full malloc to be linked.

commit ba819787ee93ceae94efd274f7849e317c1bff58
Author: Rich Felker <dalias@aerifal.cx>
Date:   Mon Jun 22 18:50:09 2015 +0000

    fix calloc when __simple_malloc implementation is used
    
    previously, calloc's implementation encoded assumptions about the
    implementation of malloc, accessing a size_t word just prior to the
    allocated memory to determine if it was obtained by mmap to optimize
    out the zero-filling. when __simple_malloc is used (static linking a
    program with no realloc/free), it doesn't matter if the result of this
    check is wrong, since all allocations are zero-initialized anyway. but
    the access could be invalid if it crosses a page boundary or if the
    pointer is not sufficiently aligned, which can happen for very small
    allocations.
    
    this patch fixes the issue by moving the zero-fill logic into malloc.c
    with the full malloc, as a new function named __malloc0, which is
    provided by a weak alias to __simple_malloc (which always gives
    zero-filled memory) when the full malloc is not in use.

commit 55d061f031085f24d138664c897791aebe9a2fab
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sat Jun 20 03:01:07 2015 +0000

    provide __stack_chk_fail_local in libc.a
    
    this symbol is needed only on archs where the PLT call ABI is klunky,
    and only for position-independent code compiled with stack protector.
    thus references usually only appear in shared libraries or PIE
    executables, but they can also appear when linking statically if some
    of the object files being linked were built as PIC/PIE.
    
    normally libssp_nonshared.a from the compiler toolchain should provide
    __stack_chk_fail_local, but reportedly it appears prior to -lc in the
    link order, thus failing to satisfy references from libc itself (which
    arise only if libc.a was built as PIC/PIE with stack protector
    enabled).

commit ce3688eca920aa77549323f84e21f33522397115
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sat Jun 20 02:54:30 2015 +0000

    work around mips detached thread exit breakage due to kernel regression
    
    linux kernel commit 46e12c07b3b9603c60fc1d421ff18618241cb081 caused
    the mips syscall mechanism to fail with EFAULT when the userspace
    stack pointer is invalid, breaking __unmapself used for detached
    thread exit. the workaround is to set $sp to a known-valid, readable
    address, and the simplest one to obtain is the address of the current
    function, which is available (per o32 calling convention) in $25.

commit 75eceb3ae824d54e865686c0c538551aeebf3372
Author: Rich Felker <dalias@aerifal.cx>
Date:   Wed Jun 17 17:21:46 2015 +0000

    ignore ENOSYS error from mprotect in pthread_create and dynamic linker
    
    this error simply indicated a system without memory protection (NOMMU)
    and should not cause failure in the caller.

commit 10d0268ccfab9152250eeeed3952ce3fed44131a
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 16 15:25:02 2015 +0000

    switch to using trap number 31 for syscalls on sh
    
    nominally the low bits of the trap number on sh are the number of
    syscall arguments, but they have never been used by the kernel, and
    some code making syscalls does not even know the number of arguments
    and needs to pass an arbitrary high number anyway.
    
    sh3/sh4 traditionally used the trap range 16-31 for syscalls, but part
    of this range overlapped with hardware exceptions/interrupts on sh2
    hardware, so an incompatible range 32-47 was chosen for sh2.
    
    using trap number 31 everywhere, since it's in the existing sh3/sh4
    range and does not conflict with sh2 hardware, is a proposed
    unification of the kernel syscall convention that will allow binaries
    to be shared between sh2 and sh3/sh4. if this is not accepted into the
    kernel, we can refit the sh2 target with runtime selection mechanisms
    for the trap number, but doing so would be invasive and would entail
    non-trivial overhead.

commit 3366a99b17847b58f2d8cc52cbb5d65deb824f8a
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 16 14:55:06 2015 +0000

    switch sh port's __unmapself to generic version when running on sh2/nommu
    
    due to the way the interrupt and syscall trap mechanism works,
    userspace on sh2 must never set the stack pointer to an invalid value.
    thus, the approach used on most archs, where __unmapself executes with
    no stack for the interval between SYS_munmap and SYS_exit, is not
    viable on sh2.
    
    in order not to pessimize sh3/sh4, the sh asm version of __unmapself
    is not removed. instead it's renamed and redirected through code that
    calls either the generic (safe) __unmapself or the sh3/sh4 asm,
    depending on compile-time and run-time conditions.

commit f9d84554bae0fa17c9a1d724549c4408022228a5
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 16 14:28:30 2015 +0000

    add support for sh2 interrupt-masking-based atomics to sh port
    
    the sh2 target is being considered an ISA subset of sh3/sh4, in the
    sense that binaries built for sh2 are intended to be usable on later
    cpu models/kernels with mmu support. so rather than hard-coding
    sh2-specific atomics, the runtime atomic selection mechanisms that was
    already in place has been extended to add sh2 atomics.
    
    at this time, the sh2 atomics are not SMP-compatible; since the ISA
    lacks actual atomic operations, the new code instead masks interrupts
    for the duration of the atomic operation, producing an atomic result
    on single-core. this is only possible because the kernel/hardware does
    not impose protections against userspace doing so. additional changes
    will be needed to support future SMP systems.
    
    care has been taken to avoid producing significant additional code
    size in the case where it's known at compile-time that the target is
    not sh2 and does not need sh2-specific code.

commit 1b0cdc8700d29ef018bf226d74b2b58b23bce91c
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 16 07:11:19 2015 +0000

    refactor stdio open file list handling, move it out of global libc struct
    
    functions which open in-memory FILE stream variants all shared a tail
    with __fdopen, adding the FILE structure to stdio's open file list.
    replacing this common tail with a function call reduces code size and
    duplication of logic. the list is also partially encapsulated now.
    
    function signatures were chosen to facilitate tail call optimization
    and reduce the need for additional accessor functions.
    
    with these changes, static linked programs that do not use stdio no
    longer have an open file list at all.

commit f22a9edaf8a6f2ca1d314d18b3785558279a5c03
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 16 06:18:00 2015 +0000

    byte-based C locale, phase 3: make MB_CUR_MAX variable to activate code
    
    this patch activates the new byte-based C locale (high bytes treated
    as abstract code unit "characters" rather than decoded as multibyte
    characters) by making the value of MB_CUR_MAX depend on the active
    locale. for the C locale, the LC_CTYPE category pointer is null,
    yielding a value of 1. all other locales yield a value of 4.

commit 16f18d036d9a7bf590ee6eb86785c0a9658220b6
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 16 05:35:31 2015 +0000

    byte-based C locale, phase 2: stdio and iconv (multibyte callers)
    
    this patch adjusts libc components which use the multibyte functions
    internally, and which depend on them operating in a particular
    encoding, to make the appropriate locale changes before calling them
    and restore the calling thread's locale afterwards. activating the
    byte-based C locale without these changes would cause regressions in
    stdio and iconv.
    
    in the case of iconv, the current implementation was simply using the
    multibyte functions as UTF-8 conversions. setting a multibyte UTF-8
    locale for the duration of the iconv operation allows the code to
    continue working.
    
    in the case of stdio, POSIX requires that FILE streams have an
    encoding rule bound at the time of setting wide orientation. as long
    as all locales, including the C locale, used the same encoding,
    treating high bytes as UTF-8, there was no need to store an encoding
    rule as part of the stream's state.
    
    a new locale field in the FILE structure points to the locale that
    should be made active during fgetwc/fputwc/ungetwc on the stream. it
    cannot point to the locale active at the time the stream becomes
    oriented, because this locale could be mutable (the global locale) or
    could be destroyed (locale_t objects produced by newlocale) before the
    stream is closed. instead, a pointer to the static C or C.UTF-8 locale
    object added in commit commit aeeac9ca5490d7d90fe061ab72da446c01ddf746
    is used. this is valid since categories other than LC_CTYPE will not
    affect these functions.

commit 1507ebf837334e9e07cfab1ca1c2e88449069a80
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 16 04:44:17 2015 +0000

    byte-based C locale, phase 1: multibyte character handling functions
    
    this patch makes the functions which work directly on multibyte
    characters treat the high bytes as individual abstract code units
    rather than as multibyte sequences when MB_CUR_MAX is 1. since
    MB_CUR_MAX is presently defined as a constant 4, all of the new code
    added is dead code, and optimizing compilers' code generation should
    not be affected at all. a future commit will activate the new code.
    
    as abstract code units, bytes 0x80 to 0xff are represented by wchar_t
    values 0xdf80 to 0xdfff, at the end of the surrogates range. this
    ensures that they will never be misinterpreted as Unicode characters,
    and that all wctype functions return false for these "characters"
    without needing locale-specific logic. a high range outside of Unicode
    such as 0x7fffff80 to 0x7fffffff was also considered, but since C11's
    char16_t also needs to be able to represent conversions of these
    bytes, the surrogate range was the natural choice.

commit 38e2f727237230300fea6aff68802db04625fd23
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 16 04:21:38 2015 +0000

    fix btowc corner case
    
    btowc is required to interpret its argument by conversion to unsigned
    char, unless the argument is equal to EOF. since the conversion to
    produces a non-character value anyway, we can just unconditionally
    convert, for now.

commit ee59c296d56bf26f49f354d6eb32b4b6d4190188
Author: Szabolcs Nagy <nsz@port70.net>
Date:   Wed Jun 3 10:32:14 2015 +0100

    arm: add vdso support
    
    vdso will be available on arm in linux v4.2, the user-space code
    for it is in kernel commit 8512287a8165592466cb9cb347ba94892e9c56a5

commit e3bc22f1eff87b8f029a6ab31f1a269d69e4b053
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sun Jun 14 01:59:02 2015 +0000

    refactor malloc's expand_heap to share with __simple_malloc
    
    this extends the brk/stack collision protection added to full malloc
    in commit 276904c2f6bde3a31a24ebfa201482601d18b4f9 to also protect the
    __simple_malloc function used in static-linked programs that don't
    reference the free function.
    
    it also extends support for using mmap when brk fails, which full
    malloc got in commit 5446303328adf4b4e36d9fba21848e6feb55fab4, to
    __simple_malloc.
    
    since __simple_malloc may expand the heap by arbitrarily large
    increments, the stack collision detection is enhanced to detect
    interval overlap rather than just proximity of a single address to the
    stack. code size is increased a bit, but this is partly offset by the
    sharing of code between the two malloc implementations, which due to
    linking semantics, both get linked in a program that needs the full
    malloc with realloc/free support.

commit 4ef9b828c1f39553a69e0635ac91f0fcadd6e8c6
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sat Jun 13 20:53:02 2015 +0000

    remove cancellation points in stdio
    
    commit 58165923890865a6ac042fafce13f440ee986fd9 added these optional
    cancellation points on the basis that cancellable stdio could be
    useful, to unblock threads stuck on stdio operations that will never
    complete. however, the only way to ensure that cancellation can
    achieve this is to violate the rules for side effects when
    cancellation is acted upon, discarding knowledge of any partial data
    transfer already completed. our implementation exhibited this behavior
    and was thus non-conforming.
    
    in addition to improving correctness, removing these cancellation
    points moderately reduces code size, and should significantly improve
    performance on i386, where sysenter/syscall instructions can be used
    instead of "int $128" for non-cancellable syscalls.

commit 536c6d5a4205e2a3f161f2983ce1e0ac3082187d
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sat Jun 13 05:17:16 2015 +0000

    fix idiom for setting stdio stream orientation to wide
    
    the old idiom, f->mode |= f->mode+1, was adapted from the idiom for
    setting byte orientation, f->mode |= f->mode-1, but the adaptation was
    incorrect. unless the stream was alreasdy set byte-oriented, this code
    incremented f->mode each time it was executed, which would eventually
    lead to overflow. it could be fixed by changing it to f->mode |= 1,
    but upcoming changes will require slightly more work at the time of
    wide orientation, so it makes sense to just call fwide. as an
    optimization in the single-character functions, fwide is only called
    if the stream is not already wide-oriented.

commit f8f565df467c13248104223f99abf7f37cef7584
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sat Jun 13 04:42:38 2015 +0000

    add printing of null %s arguments as "(null)" in wide printf
    
    this is undefined, but supported in our implementation of the normal
    printf, so for consistency the wide variant should support it too.

commit f9e25d813860d53cd1e9b6145cc63375d2fe2529
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sat Jun 13 04:37:27 2015 +0000

    add %m support to wide printf

commit ec634aad91f57479ef17525e33ed446c780a61f4
Author: Rich Felker <dalias@aerifal.cx>
Date:   Thu Jun 11 05:01:04 2015 +0000

    add sh asm for vfork

commit c30cbcb0a646b1f13a22c645616dce624465b883
Author: Rich Felker <dalias@aerifal.cx>
Date:   Wed Jun 10 02:27:40 2015 +0000

    implement arch-generic version of __unmapself
    
    this can be used to put off writing an asm version of __unmapself for
    new archs, or as a permanent solution on archs where it's not
    practical or even possible to run momentarily with no stack.
    
    the concept here is simple: the caller takes a lock on a global shared
    stack and uses it to make the munmap and exit syscalls. the only trick
    is unlocking, which must be done after the thread exits, and this is
    achieved by using the set_tid_address syscall to have the kernel zero
    and futex-wake the lock word as part of the exit syscall.

commit 276904c2f6bde3a31a24ebfa201482601d18b4f9
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 9 20:30:35 2015 +0000

    in malloc, refuse to use brk if it grows into stack
    
    the linux/nommu fdpic ELF loader sets up the brk range to overlap
    entirely with the main thread's stack (but growing from opposite
    ends), so that the resulting failure mode for malloc is not to return
    a null pointer but to start returning pointers to memory that overlaps
    with the caller's stack. needless to say this extremely dangerous and
    makes brk unusable.
    
    since it's non-trivial to detect execution environments that might be
    affected by this kernel bug, and since the severity of the bug makes
    any sort of detection that might yield false-negatives unsafe, we
    instead check the proximity of the brk to the stack pointer each time
    the brk is to be expanded. both the main thread's stack (where the
    real known risk lies) and the calling thread's stack are checked. an
    arbitrary gap distance of 8 MB is imposed, chosen to be larger than
    linux default main-thread stack reservation sizes and larger than any
    reasonable stack configuration on nommu.
    
    the effeciveness of this patch relies on an assumption that the amount
    by which the brk is being grown is smaller than the gap limit, which
    is always true for malloc's use of brk. reliance on this assumption is
    why the check is being done in malloc-specific code and not in __brk.

commit bd1eaceaa3975bd2a2a34e211cff896affaecadf
Author: Rich Felker <dalias@aerifal.cx>
Date:   Tue Jun 9 20:09:27 2015 +0000

    fix spurious errors from pwd/grp functions when nscd backend is absent
    
    for several pwd/grp functions, the only way the caller can distinguish
    between a successful negative result ("no such user/group") and an
    internal error is by clearing errno before the call and checking errno
    afterwards. the nscd backend support code correctly simulated a
    not-found response on systems where such a backend is not running, but
    failed to restore errno.
    
    this commit also fixed an outdated/incorrect comment.

commit 75ce4503950621b11fcc7f1fd1187dbcf3cde312
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sun Jun 7 20:55:23 2015 +0000

    fix regression in pre-v7 arm on kernels with kuser helper removed
    
    the arm atomics/TLS runtime selection code is called from
    __set_thread_area and depends on having libc.auxv and __hwcap
    available. commit 71f099cb7db821c51d8f39dfac622c61e54d794c moved the
    first call to __set_thread_area to the top of dynamic linking stage 3,
    before this data is made available, causing the runtime detection code
    to always see __hwcap as zero and thereby select the atomics/TLS
    implementations based on kuser helper.
    
    upcoming work on superh will use similar runtime detection.
    
    ideally this early-init code should be cleanly refactored and shared
    between the dynamic linker and static-linked startup.

commit 32f3c4f70633488550c29a2444f819aafdf345ff
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sun Jun 7 03:09:16 2015 +0000

    add multiple inclusion guard to locale_impl.h

commit 04b8360adbb6487f61aa0c00e53ec3a90a5a0d29
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sun Jun 7 02:59:49 2015 +0000

    remove redefinition of MB_CUR_MAX in locale_impl.h
    
    unless/until the byte-based C locale is implemented, defining
    MB_CUR_MAX to 1 in the C locale is wrong. no internal code currently
    uses the MB_CUR_MAX macro, but having it defined inconsistently is
    error-prone. applications get the value from stdlib.h and were
    unaffected.

commit 16bf466532d7328e971012b0731ad493b017ad29
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sat Jun 6 18:53:02 2015 +0000

    make static C and C.UTF-8 locales available outside of newlocale

commit 312eea2ea4f4363fb01b73660c08bfcf43dd3bb4
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sat Jun 6 18:20:30 2015 +0000

    remove another invalid skip of locking in ungetwc

commit 3d7e32d28dc9962e9efc1c317c5b44b5b2df3008
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sat Jun 6 18:16:22 2015 +0000

    add macro version of ctype.h isascii function
    
    presumably internal code (ungetwc and fputwc) was written assuming a
    macro implementation existed; otherwise use of isascii is just a
    pessimization.

commit 7e816a6487932cbb3cb71d94b609e50e81f4e5bf
Author: Rich Felker <dalias@aerifal.cx>
Date:   Sat Jun 6 18:11:17 2015 +0000

    remove invalid skip of locking in ungetwc
    
    aside from being invalid, the early check only optimized the error
    case, and likely pessimized the common case by separating the
    two branches on isascii(c) at opposite ends of the function.

commit 63f4b9f18f3674124d8bcb119739fec85e6da005
Author: Timo Teräs <timo.teras@iki.fi>
Date:   Fri Jun 5 10:39:42 2015 +0300

    fix uselocale((locale_t)0) not to modify locale
    
    commit 68630b55c0c7219fe9df70dc28ffbf9efc8021d8 made the new locale to
    be assigned unconditonally resulting in crashes later on.

--- a/.gitignore
+++ b/.gitignore
@@ -7,5 +7,7 @@ arch/*/bits/alltypes.h
 config.mak
 include/bits
 tools/musl-gcc
+tools/musl-clang
+tools/ld.musl-clang
 lib/musl-gcc.specs
 src/internal/version.h
--- a/Makefile
+++ b/Makefile
@@ -51,6 +51,9 @@ TOOL_LIBS = lib/musl-gcc.specs
 ALL_LIBS = $(CRT_LIBS) $(STATIC_LIBS) $(SHARED_LIBS) $(EMPTY_LIBS) $(TOOL_LIBS)
 ALL_TOOLS = tools/musl-gcc
 
+WRAPCC_GCC = gcc
+WRAPCC_CLANG = clang
+
 LDSO_PATHNAME = $(syslibdir)/ld-musl-$(ARCH)$(SUBARCH).so.1
 
 -include config.mak
@@ -155,7 +158,11 @@ lib/musl-gcc.specs: tools/musl-gcc.specs
 	sh $< "$(includedir)" "$(libdir)" "$(LDSO_PATHNAME)" > $@
 
 tools/musl-gcc: config.mak
-	printf '#!/bin/sh\nexec "$${REALGCC:-gcc}" "$$@" -specs "%s/musl-gcc.specs"\n' "$(libdir)" > $@
+	printf '#!/bin/sh\nexec "$${REALGCC:-$(WRAPCC_GCC)}" "$$@" -specs "%s/musl-gcc.specs"\n' "$(libdir)" > $@
+	chmod +x $@
+
+tools/%-clang: tools/%-clang.in config.mak
+	sed -e 's!@CC@!$(WRAPCC_CLANG)!g' -e 's!@PREFIX@!$(prefix)!g' -e 's!@INCDIR@!$(includedir)!g' -e 's!@LIBDIR@!$(libdir)!g' -e 's!@LDSO@!$(LDSO_PATHNAME)!g' $< > $@
 	chmod +x $@
 
 $(DESTDIR)$(bindir)/%: tools/%
--- a/arch/arm/syscall_arch.h
+++ b/arch/arm/syscall_arch.h
@@ -72,3 +72,7 @@ static inline long __syscall6(long n, lo
 	register long r5 __asm__("r5") = f;
 	__asm_syscall("r"(r7), "0"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r5));
 }
+
+#define VDSO_USEFUL
+#define VDSO_CGT_SYM "__vdso_clock_gettime"
+#define VDSO_CGT_VER "LINUX_2.6"
--- a/arch/mips/bits/signal.h
+++ b/arch/mips/bits/signal.h
@@ -28,7 +28,7 @@ struct sigcontext
 typedef struct
 {
 	unsigned regmask, status;
-	unsigned long long pc, regs[32], fpregs[32];
+	unsigned long long pc, gregs[32], fpregs[32];
 	unsigned ownedfp, fpc_csr, fpc_eir, used_math, dsp;
 	unsigned long long mdhi, mdlo;
 	unsigned long hi1, lo1, hi2, lo2, hi3, lo3;
--- a/arch/mips/bits/socket.h
+++ b/arch/mips/bits/socket.h
@@ -22,26 +22,31 @@ struct cmsghdr
 #define SOL_SOCKET     65535
 
 #define SO_DEBUG        1
-#define SO_REUSEADDR    4
-#define SO_TYPE         0x1008
-#define SO_ERROR        0x1007
-#define SO_DONTROUTE    16
-#define SO_BROADCAST    32
+
+#define SO_REUSEADDR    0x0004
+#define SO_KEEPALIVE    0x0008
+#define SO_DONTROUTE    0x0010
+#define SO_BROADCAST    0x0020
+#define SO_LINGER       0x0080
+#define SO_OOBINLINE    0x0100
+#define SO_REUSEPORT    0x0200
 #define SO_SNDBUF       0x1001
 #define SO_RCVBUF       0x1002
-#define SO_KEEPALIVE    8
-#define SO_OOBINLINE    256
+#define SO_SNDLOWAT     0x1003
+#define SO_RCVLOWAT     0x1004
+#define SO_RCVTIMEO     0x1006
+#define SO_SNDTIMEO     0x1005
+#define SO_ERROR        0x1007
+#define SO_TYPE         0x1008
+#define SO_ACCEPTCONN   0x1009
+#define SO_PROTOCOL     0x1028
+#define SO_DOMAIN       0x1029
+
 #define SO_NO_CHECK     11
 #define SO_PRIORITY     12
-#define SO_LINGER       128
 #define SO_BSDCOMPAT    14
-#define SO_REUSEPORT    512
 #define SO_PASSCRED     17
 #define SO_PEERCRED     18
-#define SO_RCVLOWAT     0x1004
-#define SO_SNDLOWAT     0x1003
-#define SO_RCVTIMEO     0x1006
-#define SO_SNDTIMEO     0x1005
 #define SO_SNDBUFFORCE  31
 #define SO_RCVBUFFORCE  33
 
--- a/arch/mips/pthread_arch.h
+++ b/arch/mips/pthread_arch.h
@@ -13,4 +13,6 @@ static inline struct pthread *__pthread_
 #define TLS_ABOVE_TP
 #define TP_ADJ(p) ((char *)(p) + sizeof(struct pthread) + 0x7000)
 
+#define DTP_OFFSET 0x8000
+
 #define CANCEL_REG_IP (3-(union {int __i; char __b;}){1}.__b)
--- a/arch/powerpc/bits/socket.h
+++ b/arch/powerpc/bits/socket.h
@@ -24,8 +24,6 @@ struct cmsghdr
 #define SO_BROADCAST    6
 #define SO_SNDBUF       7
 #define SO_RCVBUF       8
-#define SO_SNDBUFFORCE  32
-#define SO_RCVBUFFORCE  33
 #define SO_KEEPALIVE    9
 #define SO_OOBINLINE    10
 #define SO_NO_CHECK     11
@@ -39,4 +37,8 @@ struct cmsghdr
 #define SO_SNDTIMEO     19
 #define SO_PASSCRED     20
 #define SO_PEERCRED     21
- 
+#define SO_ACCEPTCONN   30
+#define SO_SNDBUFFORCE  32
+#define SO_RCVBUFFORCE  33
+#define SO_PROTOCOL     38
+#define SO_DOMAIN       39
--- a/arch/powerpc/pthread_arch.h
+++ b/arch/powerpc/pthread_arch.h
@@ -12,6 +12,8 @@ static inline struct pthread *__pthread_
 #define TLS_ABOVE_TP
 #define TP_ADJ(p) ((char *)(p) + sizeof(struct pthread) + 0x7000)
 
+#define DTP_OFFSET 0x8000
+
 // offset of the PC register in mcontext_t, divided by the system wordsize
 // the kernel calls the ip "nip", it's the first saved value after the 32
 // GPRs.
--- /dev/null
+++ b/arch/sh/src/__set_thread_area.c
@@ -0,0 +1,34 @@
+#include "pthread_impl.h"
+#include "libc.h"
+#include "sh_atomic.h"
+#include <elf.h>
+
+/* Also perform sh-specific init */
+
+#define CPU_HAS_LLSC 0x0040
+
+__attribute__((__visibility__("hidden"))) unsigned __sh_atomic_model, __sh_nommu;
+
+int __set_thread_area(void *p)
+{
+	size_t *aux;
+	__asm__ __volatile__ ( "ldc %0, gbr" : : "r"(p) : "memory" );
+#ifndef __SH4A__
+	if (__hwcap & CPU_HAS_LLSC) {
+		__sh_atomic_model = SH_A_LLSC;
+		return 0;
+	}
+#if !defined(__SH3__) && !defined(__SH4__)
+	for (aux=libc.auxv; *aux; aux+=2) {
+		if (*aux != AT_PLATFORM) continue;
+		const char *s = (void *)aux[1];
+		if (s[0]!='s' || s[1]!='h' || s[2]!='2' || s[3]-'0'<10u) break;
+		__sh_atomic_model = SH_A_IMASK;
+		__sh_nommu = 1;
+		return 0;
+	}
+#endif
+	/* __sh_atomic_model = SH_A_GUSA; */ /* 0, default */
+#endif
+	return 0;
+}
--- /dev/null
+++ b/arch/sh/src/__unmapself.c
@@ -0,0 +1,19 @@
+#include "pthread_impl.h"
+
+void __unmapself_sh_mmu(void *, size_t);
+void __unmapself_sh_nommu(void *, size_t);
+
+#if !defined(__SH3__) && !defined(__SH4__)
+#define __unmapself __unmapself_sh_nommu
+#include "../../../src/thread/__unmapself.c"
+#undef __unmapself
+extern __attribute__((__visibility__("hidden"))) unsigned __sh_nommu;
+#else
+#define __sh_nommu 0
+#endif
+
+void __unmapself(void *base, size_t size)
+{
+	if (__sh_nommu) __unmapself_sh_nommu(base, size);
+	else __unmapself_sh_mmu(base, size);
+}
--- a/arch/sh/src/atomic.c
+++ b/arch/sh/src/atomic.c
@@ -1,8 +1,26 @@
 #ifndef __SH4A__
 
+#include "sh_atomic.h"
 #include "atomic.h"
 #include "libc.h"
 
+static inline unsigned mask()
+{
+	unsigned sr;
+	__asm__ __volatile__ ( "\n"
+	"	stc sr,r0 \n"
+	"	mov r0,%0 \n"
+	"	or #0xf0,r0 \n"
+	"	ldc r0,sr \n"
+	: "=&r"(sr) : : "memory", "r0" );
+	return sr;
+}
+
+static inline void unmask(unsigned sr)
+{
+	__asm__ __volatile__ ( "ldc %0,sr" : : "r"(sr) : "memory" );
+}
+
 /* gusa is a hack in the kernel which lets you create a sequence of instructions
  * which will be restarted if the process is preempted in the middle of the
  * sequence. It will do for implementing atomics on non-smp systems. ABI is:
@@ -25,11 +43,17 @@
 	"	mov.l " new ", @" mem "\n" \
 	"1:	mov r1, r15\n"
 
-#define CPU_HAS_LLSC 0x0040
-
 int __sh_cas(volatile int *p, int t, int s)
 {
-	if (__hwcap & CPU_HAS_LLSC) return __sh_cas_llsc(p, t, s);
+	if (__sh_atomic_model == SH_A_LLSC) return __sh_cas_llsc(p, t, s);
+
+	if (__sh_atomic_model == SH_A_IMASK) {
+		unsigned sr = mask();
+		int old = *p;
+		if (old==t) *p = s;
+		unmask(sr);
+		return old;
+	}
 
 	int old;
 	__asm__ __volatile__(
@@ -43,7 +67,15 @@ int __sh_cas(volatile int *p, int t, int
 
 int __sh_swap(volatile int *x, int v)
 {
-	if (__hwcap & CPU_HAS_LLSC) return __sh_swap_llsc(x, v);
+	if (__sh_atomic_model == SH_A_LLSC) return __sh_swap_llsc(x, v);
+
+	if (__sh_atomic_model == SH_A_IMASK) {
+		unsigned sr = mask();
+		int old = *x;
+		*x = v;
+		unmask(sr);
+		return old;
+	}
 
 	int old;
 	__asm__ __volatile__(
@@ -55,7 +87,15 @@ int __sh_swap(volatile int *x, int v)
 
 int __sh_fetch_add(volatile int *x, int v)
 {
-	if (__hwcap & CPU_HAS_LLSC) return __sh_fetch_add_llsc(x, v);
+	if (__sh_atomic_model == SH_A_LLSC) return __sh_fetch_add_llsc(x, v);
+
+	if (__sh_atomic_model == SH_A_IMASK) {
+		unsigned sr = mask();
+		int old = *x;
+		*x = old + v;
+		unmask(sr);
+		return old;
+	}
 
 	int old, dummy;
 	__asm__ __volatile__(
@@ -69,7 +109,7 @@ int __sh_fetch_add(volatile int *x, int
 
 void __sh_store(volatile int *p, int x)
 {
-	if (__hwcap & CPU_HAS_LLSC) return __sh_store_llsc(p, x);
+	if (__sh_atomic_model == SH_A_LLSC) return __sh_store_llsc(p, x);
 	__asm__ __volatile__(
 		"	mov.l %1, @%0\n"
 		: : "r"(p), "r"(x) : "memory");
@@ -77,7 +117,15 @@ void __sh_store(volatile int *p, int x)
 
 void __sh_and(volatile int *x, int v)
 {
-	if (__hwcap & CPU_HAS_LLSC) return __sh_and_llsc(x, v);
+	if (__sh_atomic_model == SH_A_LLSC) return __sh_and_llsc(x, v);
+
+	if (__sh_atomic_model == SH_A_IMASK) {
+		unsigned sr = mask();
+		int old = *x;
+		*x = old & v;
+		unmask(sr);
+		return;
+	}
 
 	int dummy;
 	__asm__ __volatile__(
@@ -89,7 +137,15 @@ void __sh_and(volatile int *x, int v)
 
 void __sh_or(volatile int *x, int v)
 {
-	if (__hwcap & CPU_HAS_LLSC) return __sh_or_llsc(x, v);
+	if (__sh_atomic_model == SH_A_LLSC) return __sh_or_llsc(x, v);
+
+	if (__sh_atomic_model == SH_A_IMASK) {
+		unsigned sr = mask();
+		int old = *x;
+		*x = old | v;
+		unmask(sr);
+		return;
+	}
 
 	int dummy;
 	__asm__ __volatile__(
--- /dev/null
+++ b/arch/sh/src/sh_atomic.h
@@ -0,0 +1,15 @@
+#ifndef _SH_ATOMIC_H
+#define _SH_ATOMIC_H
+
+#define SH_A_GUSA 0
+#define SH_A_LLSC 1
+#define SH_A_CAS 2
+#if !defined(__SH3__) && !defined(__SH4__)
+#define SH_A_IMASK 3
+#else
+#define SH_A_IMASK -1LL /* unmatchable by unsigned int */
+#endif
+
+extern __attribute__((__visibility__("hidden"))) unsigned __sh_atomic_model;
+
+#endif
--- a/arch/sh/syscall_arch.h
+++ b/arch/sh/syscall_arch.h
@@ -8,7 +8,7 @@
  */
 #define __asm_syscall(trapno, ...) do {   \
 	__asm__ __volatile__ (                \
-		"trapa #" #trapno "\n"            \
+		"trapa #31\n"            \
 		"or r0, r0\n"                     \
 		"or r0, r0\n"                     \
 		"or r0, r0\n"                     \
--- a/configure
+++ b/configure
@@ -28,7 +28,7 @@ Optional features:
   --enable-debug          build with debugging information [disabled]
   --enable-warnings       build with recommended warnings flags [disabled]
   --enable-visibility     use global visibility options to optimize PIC [auto]
-  --enable-gcc-wrapper    build musl-gcc toolchain wrapper [auto]
+  --enable-wrapper=...    build given musl toolchain wrapper [auto]
   --disable-shared        inhibit building shared library [enabled]
   --disable-static        inhibit building static library [enabled]
 
@@ -123,6 +123,8 @@ bindir='$(exec_prefix)/bin'
 libdir='$(prefix)/lib'
 includedir='$(prefix)/include'
 syslibdir='/lib'
+tools=
+tool_libs=
 target=
 optimize=auto
 debug=no
@@ -131,6 +133,8 @@ visibility=auto
 shared=auto
 static=yes
 wrapper=auto
+gcc_wrapper=no
+clang_wrapper=no
 
 for arg ; do
 case "$arg" in
@@ -154,7 +158,12 @@ case "$arg" in
 --disable-warnings|--enable-warnings=no) warnings=no ;;
 --enable-visibility|--enable-visibility=yes) visibility=yes ;;
 --disable-visibility|--enable-visibility=no) visibility=no ;;
---enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ;;
+--enable-wrapper|--enable-wrapper=yes) wrapper=detect ;;
+--enable-wrapper=all) wrapper=yes ; gcc_wrapper=yes ; clang_wrapper=yes ;;
+--enable-wrapper=gcc) wrapper=yes ; gcc_wrapper=yes ;;
+--enable-wrapper=clang) wrapper=yes ; clang_wrapper=yes ;;
+--disable-wrapper|--enable-wrapper=no) wrapper=no ;;
+--enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ; gcc_wrapper=yes ;;
 --disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;;
 --enable-*|--disable-*|--with-*|--without-*|--*dir=*|--build=*) ;;
 --host=*|--target=*) target=${arg#*=} ;;
@@ -215,36 +224,51 @@ tryldflag LDFLAGS_TRY -Werror=unknown-wa
 tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument
 
 #
-# Need to know if the compiler is gcc to decide whether to build the
-# musl-gcc wrapper, and for critical bug detection in some gcc versions.
+# Need to know if the compiler is gcc or clang to decide which toolchain
+# wrappers to build.
 #
-printf "checking whether compiler is gcc... "
-if fnmatch '*gcc\ version*' "$(LC_ALL=C $CC -v 2>&1)" ; then
-cc_is_gcc=yes
+printf "checking for C compiler family... "
+cc_ver="$(LC_ALL=C $CC -v 2>&1)"
+cc_family=unknown
+if fnmatch '*gcc\ version*' "$cc_ver" ; then
+cc_family=gcc
+elif fnmatch '*clang\ version*' "$cc_ver" ; then
+cc_family=clang
+fi
+echo "$cc_family"
+
+#
+# Figure out toolchain wrapper to build
+#
+if test "$wrapper" = auto -o "$wrapper" = detect ; then
+echo "#include <stdlib.h>" > "$tmpc"
+echo "#if ! __GLIBC__" >> "$tmpc"
+echo "#error no" >> "$tmpc"
+echo "#endif" >> "$tmpc"
+printf "checking for toolchain wrapper to build... "
+if test "$wrapper" = auto && ! $CC -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then
+echo "none"
+elif test "$cc_family" = gcc ; then
+gcc_wrapper=yes
+echo "gcc"
+elif test "$cc_family" = clang ; then
+clang_wrapper=yes
+echo "clang"
 else
-cc_is_gcc=no
+echo "none"
+if test "$wrapper" = detect ; then
+fail "$0: could not find an appropriate toolchain wrapper"
 fi
-echo "$cc_is_gcc"
-
-#
-# Only build musl-gcc wrapper if toolchain does not already target musl
-#
-if test "$wrapper" = auto ; then
-printf "checking whether to build musl-gcc wrapper... "
-if test "$cc_is_gcc" = yes ; then
-wrapper=yes
-while read line ; do
-case "$line" in */ld-musl-*) wrapper=no ;; esac
-done <<EOF
-$($CC -dumpspecs)
-EOF
-else
-wrapper=no
 fi
-echo "$wrapper"
 fi
 
-
+if test "$gcc_wrapper" = yes ; then
+tools="$tools tools/musl-gcc"
+tool_libs="$tool_libs lib/musl-gcc.specs"
+fi
+if test "$clang_wrapper" = yes ; then
+tools="$tools tools/musl-clang tools/ld.musl-clang"
+fi
 
 #
 # Find the target architecture
@@ -580,11 +604,13 @@ LDFLAGS = $LDFLAGS_AUTO $LDFLAGS
 CROSS_COMPILE = $CROSS_COMPILE
 LIBCC = $LIBCC
 OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS
+ALL_TOOLS = $tools
+TOOL_LIBS = $tool_libs
 EOF
 test "x$static" = xno && echo "STATIC_LIBS ="
 test "x$shared" = xno && echo "SHARED_LIBS ="
-test "x$wrapper" = xno && echo "ALL_TOOLS ="
-test "x$wrapper" = xno && echo "TOOL_LIBS ="
+test "x$cc_family" = xgcc && echo 'WRAPCC_GCC = $(CC)'
+test "x$cc_family" = xclang && echo 'WRAPCC_CLANG = $(CC)'
 exec 1>&3 3>&-
 
 printf "done\n"
--- a/include/ctype.h
+++ b/include/ctype.h
@@ -64,6 +64,7 @@ int   isascii(int);
 int   toascii(int);
 #define _tolower(a) ((a)|0x20)
 #define _toupper(a) ((a)&0x5f)
+#define isascii(a) (0 ? isascii(a) : (unsigned)(a) < 128)
 
 #endif
 
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -76,7 +76,8 @@ size_t wcstombs (char *__restrict, const
 #define EXIT_FAILURE 1
 #define EXIT_SUCCESS 0
 
-#define MB_CUR_MAX ((size_t)+4)
+size_t __ctype_get_mb_cur_max(void);
+#define MB_CUR_MAX (__ctype_get_mb_cur_max())
 
 #define RAND_MAX (0x7fffffff)
 
--- a/include/sys/socket.h
+++ b/include/sys/socket.h
@@ -177,8 +177,11 @@ struct linger
 #define SO_SNDLOWAT     19
 #define SO_RCVTIMEO     20
 #define SO_SNDTIMEO     21
+#define SO_ACCEPTCONN   30
 #define SO_SNDBUFFORCE  32
 #define SO_RCVBUFFORCE  33
+#define SO_PROTOCOL     38
+#define SO_DOMAIN       39
 #endif
 
 #define SO_SECURITY_AUTHENTICATION              22
@@ -195,7 +198,6 @@ struct linger
 #define SO_TIMESTAMP            29
 #define SCM_TIMESTAMP           SO_TIMESTAMP
 
-#define SO_ACCEPTCONN           30
 #define SO_PEERSEC              31
 #define SO_PASSSEC              34
 #define SO_TIMESTAMPNS          35
@@ -203,8 +205,6 @@ struct linger
 #define SO_MARK                 36
 #define SO_TIMESTAMPING         37
 #define SCM_TIMESTAMPING        SO_TIMESTAMPING
-#define SO_PROTOCOL             38
-#define SO_DOMAIN               39
 #define SO_RXQ_OVFL             40
 #define SO_WIFI_STATUS          41
 #define SCM_WIFI_STATUS         SO_WIFI_STATUS
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -185,7 +185,7 @@ int setresgid(gid_t, gid_t, gid_t);
 int getresuid(uid_t *, uid_t *, uid_t *);
 int getresgid(gid_t *, gid_t *, gid_t *);
 char *get_current_dir_name(void);
-void syncfs(int);
+int syncfs(int);
 int euidaccess(const char *, int);
 int eaccess(const char *, int);
 #endif
--- a/src/ctype/__ctype_get_mb_cur_max.c
+++ b/src/ctype/__ctype_get_mb_cur_max.c
@@ -1,6 +1,7 @@
-#include <stddef.h>
+#include <stdlib.h>
+#include "locale_impl.h"
 
 size_t __ctype_get_mb_cur_max()
 {
-	return 4;
+	return MB_CUR_MAX;
 }
--- a/src/ctype/isascii.c
+++ b/src/ctype/isascii.c
@@ -1,4 +1,5 @@
 #include <ctype.h>
+#undef isascii
 
 int isascii(int c)
 {
--- a/src/env/__stack_chk_fail.c
+++ b/src/env/__stack_chk_fail.c
@@ -25,4 +25,8 @@ void __stack_chk_fail_local(void)
 	a_crash();
 }
 
+#else
+
+weak_alias(__stack_chk_fail, __stack_chk_fail_local);
+
 #endif
--- a/src/internal/libc.h
+++ b/src/internal/libc.h
@@ -17,8 +17,6 @@ struct __libc {
 	int secure;
 	volatile int threads_minus_1;
 	size_t *auxv;
-	FILE *ofl_head;
-	volatile int ofl_lock[2];
 	size_t tls_size;
 	size_t page_size;
 	struct __locale_struct global_locale;
--- a/src/internal/locale_impl.h
+++ b/src/internal/locale_impl.h
@@ -1,3 +1,6 @@
+#ifndef _LOCALE_IMPL_H
+#define _LOCALE_IMPL_H
+
 #include <locale.h>
 #include <stdlib.h>
 #include "libc.h"
@@ -12,6 +15,10 @@ struct __locale_map {
 	const struct __locale_map *next;
 };
 
+extern const struct __locale_map __c_dot_utf8;
+extern const struct __locale_struct __c_locale;
+extern const struct __locale_struct __c_dot_utf8_locale;
+
 const struct __locale_map *__get_locale(int, const char *);
 const char *__mo_lookup(const void *, size_t, const char *);
 const char *__lctrans(const char *, const struct __locale_map *);
@@ -20,9 +27,14 @@ const char *__lctrans_cur(const char *);
 #define LCTRANS(msg, lc, loc) __lctrans(msg, (loc)->cat[(lc)])
 #define LCTRANS_CUR(msg) __lctrans_cur(msg)
 
+#define C_LOCALE ((locale_t)&__c_locale)
+#define UTF8_LOCALE ((locale_t)&__c_dot_utf8_locale)
+
 #define CURRENT_LOCALE (__pthread_self()->locale)
 
 #define CURRENT_UTF8 (!!__pthread_self()->locale->cat[LC_CTYPE])
 
 #undef MB_CUR_MAX
 #define MB_CUR_MAX (CURRENT_UTF8 ? 4 : 1)
+
+#endif
--- a/src/internal/pthread_impl.h
+++ b/src/internal/pthread_impl.h
@@ -94,6 +94,10 @@ struct __timer {
 #define CANARY canary
 #endif
 
+#ifndef DTP_OFFSET
+#define DTP_OFFSET 0
+#endif
+
 #define SIGTIMER 32
 #define SIGCANCEL 33
 #define SIGSYNCCALL 34
--- a/src/internal/sh/syscall.s
+++ b/src/internal/sh/syscall.s
@@ -13,7 +13,7 @@ __syscall:
 	mov.l @r15, r7
 	mov.l @(4,r15), r0
 	mov.l @(8,r15), r1
-	trapa #22
+	trapa #31
 	or r0, r0
 	or r0, r0
 	or r0, r0
--- a/src/internal/stdio_impl.h
+++ b/src/internal/stdio_impl.h
@@ -47,6 +47,7 @@ struct _IO_FILE {
 	unsigned char *shend;
 	off_t shlim, shcnt;
 	FILE *prev_locked, *next_locked;
+	struct __locale_struct *locale;
 };
 
 size_t __stdio_read(FILE *, unsigned char *, size_t);
@@ -75,8 +76,9 @@ int __putc_unlocked(int, FILE *);
 FILE *__fdopen(int, const char *);
 int __fmodeflags(const char *);
 
-#define OFLLOCK() LOCK(libc.ofl_lock)
-#define OFLUNLOCK() UNLOCK(libc.ofl_lock)
+FILE *__ofl_add(FILE *f);
+FILE **__ofl_lock(void);
+void __ofl_unlock(void);
 
 #define feof(f) ((f)->flags & F_EOF)
 #define ferror(f) ((f)->flags & F_ERR)
--- a/src/ldso/dynlink.c
+++ b/src/ldso/dynlink.c
@@ -156,7 +156,7 @@ static uint32_t gnu_hash(const char *s0)
 	const unsigned char *s = (void *)s0;
 	uint_fast32_t h = 5381;
 	for (; *s; s++)
-		h = h*33 + *s;
+		h += h*32 + *s;
 	return h;
 }
 
@@ -174,32 +174,39 @@ static Sym *sysv_lookup(const char *s, u
 	return 0;
 }
 
-static Sym *gnu_lookup(const char *s, uint32_t h1, struct dso *dso)
+static Sym *gnu_lookup(uint32_t h1, uint32_t *hashtab, struct dso *dso, const char *s)
 {
-	Sym *syms = dso->syms;
-	char *strings = dso->strings;
-	uint32_t *hashtab = dso->ghashtab;
 	uint32_t nbuckets = hashtab[0];
 	uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4);
-	uint32_t h2;
-	uint32_t *hashval;
 	uint32_t i = buckets[h1 % nbuckets];
 
 	if (!i) return 0;
 
-	hashval = buckets + nbuckets + (i - hashtab[1]);
+	uint32_t *hashval = buckets + nbuckets + (i - hashtab[1]);
 
 	for (h1 |= 1; ; i++) {
-		h2 = *hashval++;
-		if ((!dso->versym || dso->versym[i] >= 0)
-		    && (h1 == (h2|1)) && !strcmp(s, strings + syms[i].st_name))
-			return syms+i;
+		uint32_t h2 = *hashval++;
+		if ((h1 == (h2|1)) && (!dso->versym || dso->versym[i] >= 0)
+		    && !strcmp(s, dso->strings + dso->syms[i].st_name))
+			return dso->syms+i;
 		if (h2 & 1) break;
 	}
 
 	return 0;
 }
 
+static Sym *gnu_lookup_filtered(uint32_t h1, uint32_t *hashtab, struct dso *dso, const char *s, uint32_t fofs, size_t fmask)
+{
+	const size_t *bloomwords = (const void *)(hashtab+4);
+	size_t f = bloomwords[fofs & (hashtab[2]-1)];
+	if (!(f & fmask)) return 0;
+
+	f >>= (h1 >> hashtab[3]) % (8 * sizeof f);
+	if (!(f & 1)) return 0;
+
+	return gnu_lookup(h1, hashtab, dso, s);
+}
+
 #define OK_TYPES (1<<STT_NOTYPE | 1<<STT_OBJECT | 1<<STT_FUNC | 1<<STT_COMMON | 1<<STT_TLS)
 #define OK_BINDS (1<<STB_GLOBAL | 1<<STB_WEAK | 1<<STB_GNU_UNIQUE)
 
@@ -209,14 +216,20 @@ static Sym *gnu_lookup(const char *s, ui
 
 static struct symdef find_sym(struct dso *dso, const char *s, int need_def)
 {
-	uint32_t h = 0, gh = 0;
+	uint32_t h = 0, gh, gho, *ght;
+	size_t ghm = 0;
 	struct symdef def = {0};
 	for (; dso; dso=dso->next) {
 		Sym *sym;
 		if (!dso->global) continue;
-		if (dso->ghashtab) {
-			if (!gh) gh = gnu_hash(s);
-			sym = gnu_lookup(s, gh, dso);
+		if ((ght = dso->ghashtab)) {
+			if (!ghm) {
+				gh = gnu_hash(s);
+				int maskbits = 8 * sizeof ghm;
+				gho = gh / maskbits;
+				ghm = 1ul << gh % maskbits;
+			}
+			sym = gnu_lookup_filtered(gh, ght, dso, s, gho, ghm);
 		} else {
 			if (!h) h = sysv_hash(s);
 			sym = sysv_lookup(s, h, dso);
@@ -337,7 +350,7 @@ static void do_relocs(struct dso *dso, s
 			*reloc_addr = def.dso->tls_id;
 			break;
 		case REL_DTPOFF:
-			*reloc_addr = tls_val + addend;
+			*reloc_addr = tls_val + addend - DTP_OFFSET;
 			break;
 #ifdef TLS_ABOVE_TP
 		case REL_TPOFF:
@@ -423,6 +436,28 @@ static void reclaim_gaps(struct dso *dso
 	}
 }
 
+static void *mmap_fixed(void *p, size_t n, int prot, int flags, int fd, off_t off)
+{
+	char *q = mmap(p, n, prot, flags, fd, off);
+	if (q != MAP_FAILED || errno != EINVAL) return q;
+	/* Fallbacks for MAP_FIXED failure on NOMMU kernels. */
+	if (flags & MAP_ANONYMOUS) {
+		memset(p, 0, n);
+		return p;
+	}
+	ssize_t r;
+	if (lseek(fd, off, SEEK_SET) < 0) return MAP_FAILED;
+	for (q=p; n; q+=r, off+=r, n-=r) {
+		r = read(fd, q, n);
+		if (r < 0 && errno != EINTR) return MAP_FAILED;
+		if (!r) {
+			memset(q, 0, n);
+			break;
+		}
+	}
+	return p;
+}
+
 static void *map_library(int fd, struct dso *dso)
 {
 	Ehdr buf[(896+sizeof(Ehdr))/sizeof(Ehdr)];
@@ -524,19 +559,20 @@ static void *map_library(int fd, struct
 		prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) |
 			((ph->p_flags&PF_W) ? PROT_WRITE: 0) |
 			((ph->p_flags&PF_X) ? PROT_EXEC : 0));
-		if (mmap(base+this_min, this_max-this_min, prot, MAP_PRIVATE|MAP_FIXED, fd, off_start) == MAP_FAILED)
+		if (mmap_fixed(base+this_min, this_max-this_min, prot, MAP_PRIVATE|MAP_FIXED, fd, off_start) == MAP_FAILED)
 			goto error;
 		if (ph->p_memsz > ph->p_filesz) {
 			size_t brk = (size_t)base+ph->p_vaddr+ph->p_filesz;
 			size_t pgbrk = brk+PAGE_SIZE-1 & -PAGE_SIZE;
 			memset((void *)brk, 0, pgbrk-brk & PAGE_SIZE-1);
-			if (pgbrk-(size_t)base < this_max && mmap((void *)pgbrk, (size_t)base+this_max-pgbrk, prot, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) == MAP_FAILED)
+			if (pgbrk-(size_t)base < this_max && mmap_fixed((void *)pgbrk, (size_t)base+this_max-pgbrk, prot, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) == MAP_FAILED)
 				goto error;
 		}
 	}
 	for (i=0; ((size_t *)(base+dyn))[i]; i+=2)
 		if (((size_t *)(base+dyn))[i]==DT_TEXTREL) {
-			if (mprotect(map, map_len, PROT_READ|PROT_WRITE|PROT_EXEC) < 0)
+			if (mprotect(map, map_len, PROT_READ|PROT_WRITE|PROT_EXEC)
+			    && errno != ENOSYS)
 				goto error;
 			break;
 		}
@@ -927,7 +963,8 @@ static void reloc_all(struct dso *p)
 		do_relocs(p, (void *)(p->base+dyn[DT_RELA]), dyn[DT_RELASZ], 3);
 
 		if (head != &ldso && p->relro_start != p->relro_end &&
-		    mprotect(p->base+p->relro_start, p->relro_end-p->relro_start, PROT_READ) < 0) {
+		    mprotect(p->base+p->relro_start, p->relro_end-p->relro_start, PROT_READ)
+		    && errno != ENOSYS) {
 			error("Error relocating %s: RELRO protection failed: %m",
 				p->name);
 			if (runtime) longjmp(*rtld_fail, 1);
@@ -1078,7 +1115,7 @@ void *__tls_get_new(size_t *v)
 	__block_all_sigs(&set);
 	if (v[0]<=(size_t)self->dtv[0]) {
 		__restore_sigs(&set);
-		return (char *)self->dtv[v[0]]+v[1];
+		return (char *)self->dtv[v[0]]+v[1]+DTP_OFFSET;
 	}
 
 	/* This is safe without any locks held because, if the caller
@@ -1111,7 +1148,7 @@ void *__tls_get_new(size_t *v)
 		if (p->tls_id == v[0]) break;
 	}
 	__restore_sigs(&set);
-	return mem + v[1];
+	return mem + v[1] + DTP_OFFSET;
 }
 
 static void update_tls_size()
@@ -1192,6 +1229,17 @@ _Noreturn void __dls3(size_t *sp)
 	char **argv_orig = argv;
 	char **envp = argv+argc+1;
 
+	/* Find aux vector just past environ[] and use it to initialize
+	 * global data that may be needed before we can make syscalls. */
+	__environ = envp;
+	for (i=argc+1; argv[i]; i++);
+	libc.auxv = auxv = (void *)(argv+i+1);
+	decode_vec(auxv, aux, AUX_CNT);
+	__hwcap = aux[AT_HWCAP];
+	libc.page_size = aux[AT_PAGESZ];
+	libc.secure = ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID]
+		|| aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]);
+
 	/* Setup early thread pointer in builtin_tls for ldso/libc itself to
 	 * use during dynamic linking. If possible it will also serve as the
 	 * thread pointer at runtime. */
@@ -1200,25 +1248,11 @@ _Noreturn void __dls3(size_t *sp)
 		a_crash();
 	}
 
-	/* Find aux vector just past environ[] */
-	for (i=argc+1; argv[i]; i++)
-		if (!memcmp(argv[i], "LD_LIBRARY_PATH=", 16))
-			env_path = argv[i]+16;
-		else if (!memcmp(argv[i], "LD_PRELOAD=", 11))
-			env_preload = argv[i]+11;
-	auxv = (void *)(argv+i+1);
-
-	decode_vec(auxv, aux, AUX_CNT);
-
 	/* Only trust user/env if kernel says we're not suid/sgid */
-	if ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID]
-	  || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]) {
-		env_path = 0;
-		env_preload = 0;
-		libc.secure = 1;
+	if (!libc.secure) {
+		env_path = getenv("LD_LIBRARY_PATH");
+		env_preload = getenv("LD_PRELOAD");
 	}
-	libc.page_size = aux[AT_PAGESZ];
-	libc.auxv = auxv;
 
 	/* If the main program was already loaded by the kernel,
 	 * AT_PHDR will point to some location other than the dynamic
@@ -1523,7 +1557,7 @@ void *__tls_get_addr(size_t *);
 static void *do_dlsym(struct dso *p, const char *s, void *ra)
 {
 	size_t i;
-	uint32_t h = 0, gh = 0;
+	uint32_t h = 0, gh = 0, *ght;
 	Sym *sym;
 	if (p == head || p == RTLD_DEFAULT || p == RTLD_NEXT) {
 		if (p == RTLD_DEFAULT) {
@@ -1541,9 +1575,9 @@ static void *do_dlsym(struct dso *p, con
 	}
 	if (invalid_dso_handle(p))
 		return 0;
-	if (p->ghashtab) {
+	if ((ght = p->ghashtab)) {
 		gh = gnu_hash(s);
-		sym = gnu_lookup(s, gh, p);
+		sym = gnu_lookup(gh, ght, p, s);
 	} else {
 		h = sysv_hash(s);
 		sym = sysv_lookup(s, h, p);
@@ -1553,9 +1587,9 @@ static void *do_dlsym(struct dso *p, con
 	if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES))
 		return p->base + sym->st_value;
 	if (p->deps) for (i=0; p->deps[i]; i++) {
-		if (p->deps[i]->ghashtab) {
+		if ((ght = p->deps[i]->ghashtab)) {
 			if (!gh) gh = gnu_hash(s);
-			sym = gnu_lookup(s, gh, p->deps[i]);
+			sym = gnu_lookup(gh, ght, p->deps[i], s);
 		} else {
 			if (!h) h = sysv_hash(s);
 			sym = sysv_lookup(s, h, p->deps[i]);
--- a/src/linux/syncfs.c
+++ b/src/linux/syncfs.c
@@ -2,7 +2,7 @@
 #include <unistd.h>
 #include "syscall.h"
 
-void syncfs(int fd)
+int syncfs(int fd)
 {
-	__syscall(SYS_syncfs, fd);
+	return syscall(SYS_syncfs, fd);
 }
--- /dev/null
+++ b/src/locale/c_locale.c
@@ -0,0 +1,15 @@
+#include "locale_impl.h"
+#include <stdint.h>
+
+static const uint32_t empty_mo[] = { 0x950412de, 0, -1, -1, -1 };
+
+const struct __locale_map __c_dot_utf8 = {
+	.map = empty_mo,
+	.map_size = sizeof empty_mo,
+	.name = "C.UTF-8"
+};
+
+const struct __locale_struct __c_locale = { 0 };
+const struct __locale_struct __c_dot_utf8_locale = {
+	.cat[LC_CTYPE] = &__c_dot_utf8
+};
--- a/src/locale/iconv.c
+++ b/src/locale/iconv.c
@@ -5,6 +5,7 @@
 #include <stdlib.h>
 #include <limits.h>
 #include <stdint.h>
+#include "locale_impl.h"
 
 #define UTF_32BE    0300
 #define UTF_16LE    0301
@@ -165,9 +166,12 @@ size_t iconv(iconv_t cd0, char **restric
 	int err;
 	unsigned char type = map[-1];
 	unsigned char totype = tomap[-1];
+	locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
 
 	if (!in || !*in || !*inb) return 0;
 
+	*ploc = UTF8_LOCALE;
+
 	for (; *inb; *in+=l, *inb-=l) {
 		c = *(unsigned char *)*in;
 		l = 1;
@@ -431,6 +435,7 @@ size_t iconv(iconv_t cd0, char **restric
 			break;
 		}
 	}
+	*ploc = loc;
 	return x;
 ilseq:
 	err = EILSEQ;
@@ -445,5 +450,6 @@ starved:
 	x = -1;
 end:
 	errno = err;
+	*ploc = loc;
 	return x;
 }
--- a/src/locale/langinfo.c
+++ b/src/locale/langinfo.c
@@ -33,7 +33,8 @@ char *__nl_langinfo_l(nl_item item, loca
 	int idx = item & 65535;
 	const char *str;
 
-	if (item == CODESET) return "UTF-8";
+	if (item == CODESET)
+		return MB_CUR_MAX==1 ? "UTF-8-CODE-UNITS" : "UTF-8";
 	
 	switch (cat) {
 	case LC_NUMERIC:
--- a/src/locale/locale_map.c
+++ b/src/locale/locale_map.c
@@ -24,14 +24,6 @@ static const char envvars[][12] = {
 	"LC_MESSAGES",
 };
 
-static const uint32_t empty_mo[] = { 0x950412de, 0, -1, -1, -1 };
-
-const struct __locale_map __c_dot_utf8 = {
-	.map = empty_mo,
-	.map_size = sizeof empty_mo,
-	.name = "C.UTF-8"
-};
-
 const struct __locale_map *__get_locale(int cat, const char *val)
 {
 	static int lock[2];
@@ -107,8 +99,8 @@ const struct __locale_map *__get_locale(
 	 * sake of being able to do message translations at the
 	 * application level. */
 	if (!new && (new = malloc(sizeof *new))) {
-		new->map = empty_mo;
-		new->map_size = sizeof empty_mo;
+		new->map = __c_dot_utf8.map;
+		new->map_size = __c_dot_utf8.map_size;
 		memcpy(new->name, val, n);
 		new->name[n] = 0;
 		new->next = loc_head;
--- a/src/locale/newlocale.c
+++ b/src/locale/newlocale.c
@@ -3,16 +3,9 @@
 #include "locale_impl.h"
 #include "libc.h"
 
-extern const struct __locale_map __c_dot_utf8;
-
-static const struct __locale_struct c_locale = { 0 };
-static const struct __locale_struct c_dot_utf8_locale = {
-	.cat[LC_CTYPE] = &__c_dot_utf8
-};
-
 int __loc_is_allocated(locale_t loc)
 {
-	return loc && loc != &c_locale && loc != &c_dot_utf8_locale;
+	return loc && loc != C_LOCALE && loc != UTF8_LOCALE;
 }
 
 locale_t __newlocale(int mask, const char *name, locale_t loc)
@@ -44,9 +37,9 @@ locale_t __newlocale(int mask, const cha
 	}
 
 	if (!j)
-		return (locale_t)&c_locale;
-	if (j==1 && tmp.cat[LC_CTYPE]==c_dot_utf8_locale.cat[LC_CTYPE])
-		return (locale_t)&c_dot_utf8_locale;
+		return C_LOCALE;
+	if (j==1 && tmp.cat[LC_CTYPE]==&__c_dot_utf8)
+		return UTF8_LOCALE;
 
 	if ((loc = malloc(sizeof *loc))) *loc = tmp;
 
--- a/src/locale/uselocale.c
+++ b/src/locale/uselocale.c
@@ -8,9 +8,7 @@ locale_t __uselocale(locale_t new)
 	locale_t old = self->locale;
 	locale_t global = &libc.global_locale;
 
-	if (new == LC_GLOBAL_LOCALE) new = global;
-
-	self->locale = new;
+	if (new) self->locale = new == LC_GLOBAL_LOCALE ? global : new;
 
 	return old == global ? LC_GLOBAL_LOCALE : old;
 }
--- a/src/malloc/calloc.c
+++ b/src/malloc/calloc.c
@@ -1,22 +1,13 @@
 #include <stdlib.h>
 #include <errno.h>
 
+void *__malloc0(size_t);
+
 void *calloc(size_t m, size_t n)
 {
-	void *p;
-	size_t *z;
 	if (n && m > (size_t)-1/n) {
 		errno = ENOMEM;
 		return 0;
 	}
-	n *= m;
-	p = malloc(n);
-	if (!p) return 0;
-	/* Only do this for non-mmapped chunks */
-	if (((size_t *)p)[-1] & 7) {
-		/* Only write words that are not already zero */
-		m = (n + sizeof *z - 1)/sizeof *z;
-		for (z=p; m; m--, z++) if (*z) *z=0;
-	}
-	return p;
+	return __malloc0(n * m);
 }
--- /dev/null
+++ b/src/malloc/expand_heap.c
@@ -0,0 +1,72 @@
+#include <limits.h>
+#include <stdint.h>
+#include <errno.h>
+#include <sys/mman.h>
+#include "libc.h"
+#include "syscall.h"
+
+/* This function returns true if the interval [old,new]
+ * intersects the 'len'-sized interval below &libc.auxv
+ * (interpreted as the main-thread stack) or below &b
+ * (the current stack). It is used to defend against
+ * buggy brk implementations that can cross the stack. */
+
+static int traverses_stack_p(uintptr_t old, uintptr_t new)
+{
+	const uintptr_t len = 8<<20;
+	uintptr_t a, b;
+
+	b = (uintptr_t)libc.auxv;
+	a = b > len ? b-len : 0;
+	if (new>a && old<b) return 1;
+
+	b = (uintptr_t)&b;
+	a = b > len ? b-len : 0;
+	if (new>a && old<b) return 1;
+
+	return 0;
+}
+
+void *__mmap(void *, size_t, int, int, int, off_t);
+
+/* Expand the heap in-place if brk can be used, or otherwise via mmap,
+ * using an exponential lower bound on growth by mmap to make
+ * fragmentation asymptotically irrelevant. The size argument is both
+ * an input and an output, since the caller needs to know the size
+ * allocated, which will be larger than requested due to page alignment
+ * and mmap minimum size rules. The caller is responsible for locking
+ * to prevent concurrent calls. */
+
+void *__expand_heap(size_t *pn)
+{
+	static uintptr_t brk;
+	static unsigned mmap_step;
+	size_t n = *pn;
+
+	if (n > SIZE_MAX/2 - PAGE_SIZE) {
+		errno = ENOMEM;
+		return 0;
+	}
+	n += -n & PAGE_SIZE-1;
+
+	if (!brk) {
+		brk = __syscall(SYS_brk, 0);
+		brk += -brk & PAGE_SIZE-1;
+	}
+
+	if (n < SIZE_MAX-brk && !traverses_stack_p(brk, brk+n)
+	    && __syscall(SYS_brk, brk+n)==brk+n) {
+		*pn = n;
+		brk += n;
+		return (void *)(brk-n);
+	}
+
+	size_t min = (size_t)PAGE_SIZE << mmap_step/2;
+	if (n < min) n = min;
+	void *area = __mmap(0, n, PROT_READ|PROT_WRITE,
+		MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
+	if (area == MAP_FAILED) return 0;
+	*pn = n;
+	mmap_step++;
+	return area;
+}
--- a/src/malloc/lite_malloc.c
+++ b/src/malloc/lite_malloc.c
@@ -4,43 +4,47 @@
 #include <errno.h>
 #include "libc.h"
 
-uintptr_t __brk(uintptr_t);
-
 #define ALIGN 16
 
+void *__expand_heap(size_t *);
+
 void *__simple_malloc(size_t n)
 {
-	static uintptr_t cur, brk;
-	uintptr_t base, new;
+	static char *cur, *end;
 	static volatile int lock[2];
-	size_t align=1;
+	size_t align=1, pad;
+	void *p;
 
 	if (!n) n++;
-	if (n > SIZE_MAX/2) goto toobig;
-
 	while (align<n && align<ALIGN)
 		align += align;
-	n = n + align - 1 & -align;
 
 	LOCK(lock);
-	if (!cur) cur = brk = __brk(0)+16;
-	base = cur + align-1 & -align;
-	if (n > SIZE_MAX - PAGE_SIZE - base) goto fail;
-	if (base+n > brk) {
-		new = base+n + PAGE_SIZE-1 & -PAGE_SIZE;
-		if (__brk(new) != new) goto fail;
-		brk = new;
-	}
-	cur = base+n;
-	UNLOCK(lock);
 
-	return (void *)base;
+	pad = -(uintptr_t)cur & align-1;
+
+	if (n <= SIZE_MAX/2 + ALIGN) n += pad;
+
+	if (n > end-cur) {
+		size_t m = n;
+		char *new = __expand_heap(&m);
+		if (!new) {
+			UNLOCK(lock);
+			return 0;
+		}
+		if (new != end) {
+			cur = new;
+			n -= pad;
+			pad = 0;
+		}
+		end = new + m;
+	}
 
-fail:
+	p = cur + pad;
+	cur += n;
 	UNLOCK(lock);
-toobig:
-	errno = ENOMEM;
-	return 0;
+	return p;
 }
 
 weak_alias(__simple_malloc, malloc);
+weak_alias(__simple_malloc, __malloc0);
--- a/src/malloc/malloc.c
+++ b/src/malloc/malloc.c
@@ -13,7 +13,6 @@
 #define inline inline __attribute__((always_inline))
 #endif
 
-uintptr_t __brk(uintptr_t);
 void *__mmap(void *, size_t, int, int, int, off_t);
 int __munmap(void *, size_t);
 void *__mremap(void *, size_t, size_t, int, ...);
@@ -31,13 +30,9 @@ struct bin {
 };
 
 static struct {
-	uintptr_t brk;
-	size_t *heap;
 	volatile uint64_t binmap;
 	struct bin bins[64];
-	volatile int brk_lock[2];
 	volatile int free_lock[2];
-	unsigned mmap_step;
 } mal;
 
 
@@ -152,69 +147,52 @@ void __dump_heap(int x)
 }
 #endif
 
+void *__expand_heap(size_t *);
+
 static struct chunk *expand_heap(size_t n)
 {
-	static int init;
+	static int heap_lock[2];
+	static void *end;
+	void *p;
 	struct chunk *w;
-	uintptr_t new;
-
-	lock(mal.brk_lock);
-
-	if (!init) {
-		mal.brk = __brk(0);
-#ifdef SHARED
-		mal.brk = mal.brk + PAGE_SIZE-1 & -PAGE_SIZE;
-#endif
-		mal.brk = mal.brk + 2*SIZE_ALIGN-1 & -SIZE_ALIGN;
-		mal.heap = (void *)mal.brk;
-		init = 1;
-	}
-
-	if (n > SIZE_MAX - mal.brk - 2*PAGE_SIZE) goto fail;
-	new = mal.brk + n + SIZE_ALIGN + PAGE_SIZE - 1 & -PAGE_SIZE;
-	n = new - mal.brk;
-
-	if (__brk(new) != new) {
-		size_t min = (size_t)PAGE_SIZE << mal.mmap_step/2;
-		n += -n & PAGE_SIZE-1;
-		if (n < min) n = min;
-		void *area = __mmap(0, n, PROT_READ|PROT_WRITE,
-			MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
-		if (area == MAP_FAILED) goto fail;
 
-		mal.mmap_step++;
-		area = (char *)area + SIZE_ALIGN - OVERHEAD;
-		w = area;
+	/* The argument n already accounts for the caller's chunk
+	 * overhead needs, but if the heap can't be extended in-place,
+	 * we need room for an extra zero-sized sentinel chunk. */
+	n += SIZE_ALIGN;
+
+	lock(heap_lock);
+
+	p = __expand_heap(&n);
+	if (!p) {
+		unlock(heap_lock);
+		return 0;
+	}
+
+	/* If not just expanding existing space, we need to make a
+	 * new sentinel chunk below the allocated space. */
+	if (p != end) {
+		/* Valid/safe because of the prologue increment. */
 		n -= SIZE_ALIGN;
+		p = (char *)p + SIZE_ALIGN;
+		w = MEM_TO_CHUNK(p);
 		w->psize = 0 | C_INUSE;
-		w->csize = n | C_INUSE;
-		w = NEXT_CHUNK(w);
-		w->psize = n | C_INUSE;
-		w->csize = 0 | C_INUSE;
-
-		unlock(mal.brk_lock);
-
-		return area;
 	}
 
-	w = MEM_TO_CHUNK(mal.heap);
-	w->psize = 0 | C_INUSE;
-
-	w = MEM_TO_CHUNK(new);
+	/* Record new heap end and fill in footer. */
+	end = (char *)p + n;
+	w = MEM_TO_CHUNK(end);
 	w->psize = n | C_INUSE;
 	w->csize = 0 | C_INUSE;
 
-	w = MEM_TO_CHUNK(mal.brk);
+	/* Fill in header, which may be new or may be replacing a
+	 * zero-size sentinel header at the old end-of-heap. */
+	w = MEM_TO_CHUNK(p);
 	w->csize = n | C_INUSE;
-	mal.brk = new;
-	
-	unlock(mal.brk_lock);
+
+	unlock(heap_lock);
 
 	return w;
-fail:
-	unlock(mal.brk_lock);
-	errno = ENOMEM;
-	return 0;
 }
 
 static int adjust_size(size_t *n)
@@ -378,6 +356,17 @@ void *malloc(size_t n)
 	return CHUNK_TO_MEM(c);
 }
 
+void *__malloc0(size_t n)
+{
+	void *p = malloc(n);
+	if (p && !IS_MMAPPED(MEM_TO_CHUNK(p))) {
+		size_t *z;
+		n = (n + sizeof *z - 1)/sizeof *z;
+		for (z=p; n; n--, z++) if (*z) *z=0;
+	}
+	return p;
+}
+
 void *realloc(void *p, size_t n)
 {
 	struct chunk *self, *next;
--- a/src/misc/syslog.c
+++ b/src/misc/syslog.c
@@ -48,12 +48,8 @@ void closelog(void)
 
 static void __openlog()
 {
-	int fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
-	if (fd < 0) return;
-	if (connect(fd, (void *)&log_addr, sizeof log_addr) < 0)
-		close(fd);
-	else
-		log_fd = fd;
+	log_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
+	if (log_fd >= 0) connect(log_fd, (void *)&log_addr, sizeof log_addr);
 }
 
 void openlog(const char *ident, int opt, int facility)
@@ -78,6 +74,11 @@ void openlog(const char *ident, int opt,
 	pthread_setcancelstate(cs, 0);
 }
 
+static int is_lost_conn(int e)
+{
+	return e==ECONNREFUSED || e==ECONNRESET || e==ENOTCONN || e==EPIPE;
+}
+
 static void _vsyslog(int priority, const char *message, va_list ap)
 {
 	char timebuf[16];
@@ -107,7 +108,10 @@ static void _vsyslog(int priority, const
 		if (l2 >= sizeof buf - l) l = sizeof buf - 1;
 		else l += l2;
 		if (buf[l-1] != '\n') buf[l++] = '\n';
-		if (send(log_fd, buf, l, 0) < 0 && (log_opt & LOG_CONS)) {
+		if (send(log_fd, buf, l, 0) < 0 && (!is_lost_conn(errno)
+		    || connect(log_fd, (void *)&log_addr, sizeof log_addr) < 0
+		    || send(log_fd, buf, l, 0) < 0)
+		    && (log_opt & LOG_CONS)) {
 			fd = open("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
 			if (fd >= 0) {
 				dprintf(fd, "%.*s", l-hlen, buf+hlen);
--- a/src/multibyte/btowc.c
+++ b/src/multibyte/btowc.c
@@ -1,7 +1,10 @@
 #include <stdio.h>
 #include <wchar.h>
+#include <stdlib.h>
+#include "internal.h"
 
 wint_t btowc(int c)
 {
-	return c<128U ? c : EOF;
+	int b = (unsigned char)c;
+	return b<128U ? b : (MB_CUR_MAX==1 && c!=EOF) ? CODEUNIT(c) : WEOF;
 }
--- a/src/multibyte/internal.h
+++ b/src/multibyte/internal.h
@@ -23,3 +23,10 @@ extern const uint32_t bittab[];
 
 #define SA 0xc2u
 #define SB 0xf4u
+
+/* Arbitrary encoding for representing code units instead of characters. */
+#define CODEUNIT(c) (0xdfff & (signed char)(c))
+#define IS_CODEUNIT(c) ((unsigned)(c)-0xdf80 < 0x80)
+
+/* Get inline definition of MB_CUR_MAX. */
+#include "locale_impl.h"
--- a/src/multibyte/mbrtowc.c
+++ b/src/multibyte/mbrtowc.c
@@ -4,6 +4,7 @@
  * unnecessary.
  */
 
+#include <stdlib.h>
 #include <wchar.h>
 #include <errno.h>
 #include "internal.h"
@@ -27,6 +28,7 @@ size_t mbrtowc(wchar_t *restrict wc, con
 	if (!n) return -2;
 	if (!c) {
 		if (*s < 0x80) return !!(*wc = *s);
+		if (MB_CUR_MAX==1) return (*wc = CODEUNIT(*s)), 1;
 		if (*s-SA > SB-SA) goto ilseq;
 		c = bittab[*s++-SA]; n--;
 	}
--- a/src/multibyte/mbsrtowcs.c
+++ b/src/multibyte/mbsrtowcs.c
@@ -7,6 +7,8 @@
 #include <stdint.h>
 #include <wchar.h>
 #include <errno.h>
+#include <string.h>
+#include <stdlib.h>
 #include "internal.h"
 
 size_t mbsrtowcs(wchar_t *restrict ws, const char **restrict src, size_t wn, mbstate_t *restrict st)
@@ -24,6 +26,23 @@ size_t mbsrtowcs(wchar_t *restrict ws, c
 		}
 	}
 
+	if (MB_CUR_MAX==1) {
+		if (!ws) return strlen((const char *)s);
+		for (;;) {
+			if (!wn) {
+				*src = (const void *)s;
+				return wn0;
+			}
+			if (!*s) break;
+			c = *s++;
+			*ws++ = CODEUNIT(c);
+			wn--;
+		}
+		*ws = 0;
+		*src = 0;
+		return wn0-wn;
+	}
+
 	if (!ws) for (;;) {
 		if (*s-1u < 0x7f && (uintptr_t)s%4 == 0) {
 			while (!(( *(uint32_t*)s | *(uint32_t*)s-0x01010101) & 0x80808080)) {
--- a/src/multibyte/mbtowc.c
+++ b/src/multibyte/mbtowc.c
@@ -4,6 +4,7 @@
  * unnecessary.
  */
 
+#include <stdlib.h>
 #include <wchar.h>
 #include <errno.h>
 #include "internal.h"
@@ -19,6 +20,7 @@ int mbtowc(wchar_t *restrict wc, const c
 	if (!wc) wc = &dummy;
 
 	if (*s < 0x80) return !!(*wc = *s);
+	if (MB_CUR_MAX==1) return (*wc = CODEUNIT(*s)), 1;
 	if (*s-SA > SB-SA) goto ilseq;
 	c = bittab[*s++-SA];
 
--- a/src/multibyte/wcrtomb.c
+++ b/src/multibyte/wcrtomb.c
@@ -4,8 +4,10 @@
  * unnecessary.
  */
 
+#include <stdlib.h>
 #include <wchar.h>
 #include <errno.h>
+#include "internal.h"
 
 size_t wcrtomb(char *restrict s, wchar_t wc, mbstate_t *restrict st)
 {
@@ -13,6 +15,13 @@ size_t wcrtomb(char *restrict s, wchar_t
 	if ((unsigned)wc < 0x80) {
 		*s = wc;
 		return 1;
+	} else if (MB_CUR_MAX == 1) {
+		if (!IS_CODEUNIT(wc)) {
+			errno = EILSEQ;
+			return -1;
+		}
+		*s = wc;
+		return 1;
 	} else if ((unsigned)wc < 0x800) {
 		*s++ = 0xc0 | (wc>>6);
 		*s = 0x80 | (wc&0x3f);
--- a/src/multibyte/wctob.c
+++ b/src/multibyte/wctob.c
@@ -1,8 +1,10 @@
-#include <stdio.h>
 #include <wchar.h>
+#include <stdlib.h>
+#include "internal.h"
 
 int wctob(wint_t c)
 {
 	if (c < 128U) return c;
+	if (MB_CUR_MAX==1 && IS_CODEUNIT(c)) return (unsigned char)c;
 	return EOF;
 }
--- a/src/network/ns_parse.c
+++ b/src/network/ns_parse.c
@@ -95,7 +95,7 @@ int ns_skiprr(const unsigned char *ptr,
 			p += r;
 		}
 	}
-	return ptr - p;
+	return p - ptr;
 bad:
 	errno = EMSGSIZE;
 	return -1;
--- a/src/passwd/nscd_query.c
+++ b/src/passwd/nscd_query.c
@@ -32,6 +32,7 @@ FILE *__nscd_query(int32_t req, const ch
 		},
 		.msg_iovlen = 2
 	};
+	int errno_save = errno;
 
 	*swap = 0;
 retry:
@@ -50,11 +51,14 @@ retry:
 		return f;
 
 	if (connect(fd, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
-		/* If there isn't a running nscd we return -1 to indicate that
-		 * that is precisely what happened
-		 */
-		if (errno == EACCES || errno == ECONNREFUSED || errno == ENOENT)
+		/* If there isn't a running nscd we simulate a "not found"
+		 * result and the caller is responsible for calling
+		 * fclose on the (unconnected) socket. The value of
+		 * errno must be left unchanged in this case.  */
+		if (errno == EACCES || errno == ECONNREFUSED || errno == ENOENT) {
+			errno = errno_save;
 			return f;
+		}
 		goto error;
 	}
 
--- /dev/null
+++ b/src/process/sh/vfork.s
@@ -0,0 +1,23 @@
+.global __vfork
+.weak vfork
+.type __vfork,@function
+.type vfork,@function
+__vfork:
+vfork:
+	mov #95, r3
+	add r3, r3
+
+	trapa #31
+	or    r0, r0
+	or    r0, r0
+	or    r0, r0
+	or    r0, r0
+	or    r0, r0
+
+	mov r0, r4
+	mov.l 1f, r0
+2:	braf r0
+	 nop
+	.align 2
+	.hidden __syscall_ret
+1:	.long __syscall_ret@PLT-(2b+4-.)
--- a/src/regex/fnmatch.c
+++ b/src/regex/fnmatch.c
@@ -18,6 +18,7 @@
 #include <stdlib.h>
 #include <wchar.h>
 #include <wctype.h>
+#include "locale_impl.h"
 
 #define END 0
 #define UNMATCHABLE -2
@@ -229,7 +230,7 @@ static int fnmatch_internal(const char *
 	 * On illegal sequences we may get it wrong, but in that case
 	 * we necessarily have a matching failure anyway. */
 	for (s=endstr; s>str && tailcnt; tailcnt--) {
-		if (s[-1] < 128U) s--;
+		if (s[-1] < 128U || MB_CUR_MAX==1) s--;
 		else while ((unsigned char)*--s-0x80U<0x40 && s>str);
 	}
 	if (tailcnt) return FNM_NOMATCH;
--- a/src/signal/sh/restore.s
+++ b/src/signal/sh/restore.s
@@ -2,7 +2,7 @@
 .type   __restore, @function
 __restore:
 	mov   #119, r3  !__NR_sigreturn
-	trapa #16
+	trapa #31
 
 	or    r0, r0
 	or    r0, r0
@@ -15,7 +15,7 @@ __restore:
 __restore_rt:
 	mov   #100, r3  !__NR_rt_sigreturn
 	add   #73, r3
-	trapa #16
+	trapa #31
 
 	or    r0, r0
 	or    r0, r0
--- a/src/stdio/__fdopen.c
+++ b/src/stdio/__fdopen.c
@@ -54,13 +54,7 @@ FILE *__fdopen(int fd, const char *mode)
 	if (!libc.threaded) f->lock = -1;
 
 	/* Add new FILE to open file list */
-	OFLLOCK();
-	f->next = libc.ofl_head;
-	if (libc.ofl_head) libc.ofl_head->prev = f;
-	libc.ofl_head = f;
-	OFLUNLOCK();
-
-	return f;
+	return __ofl_add(f);
 }
 
 weak_alias(__fdopen, fdopen);
--- a/src/stdio/__stdio_exit.c
+++ b/src/stdio/__stdio_exit.c
@@ -16,8 +16,7 @@ static void close_file(FILE *f)
 void __stdio_exit(void)
 {
 	FILE *f;
-	OFLLOCK();
-	for (f=libc.ofl_head; f; f=f->next) close_file(f);
+	for (f=*__ofl_lock(); f; f=f->next) close_file(f);
 	close_file(__stdin_used);
 	close_file(__stdout_used);
 }
--- a/src/stdio/__stdio_read.c
+++ b/src/stdio/__stdio_read.c
@@ -1,12 +1,5 @@
 #include "stdio_impl.h"
 #include <sys/uio.h>
-#include <pthread.h>
-
-static void cleanup(void *p)
-{
-	FILE *f = p;
-	if (!f->lockcount) __unlockfile(f);
-}
 
 size_t __stdio_read(FILE *f, unsigned char *buf, size_t len)
 {
@@ -16,9 +9,7 @@ size_t __stdio_read(FILE *f, unsigned ch
 	};
 	ssize_t cnt;
 
-	pthread_cleanup_push(cleanup, f);
-	cnt = syscall_cp(SYS_readv, f->fd, iov, 2);
-	pthread_cleanup_pop(0);
+	cnt = syscall(SYS_readv, f->fd, iov, 2);
 	if (cnt <= 0) {
 		f->flags |= F_EOF ^ ((F_ERR^F_EOF) & cnt);
 		return cnt;
--- a/src/stdio/__stdio_write.c
+++ b/src/stdio/__stdio_write.c
@@ -1,12 +1,5 @@
 #include "stdio_impl.h"
 #include <sys/uio.h>
-#include <pthread.h>
-
-static void cleanup(void *p)
-{
-	FILE *f = p;
-	if (!f->lockcount) __unlockfile(f);
-}
 
 size_t __stdio_write(FILE *f, const unsigned char *buf, size_t len)
 {
@@ -19,9 +12,7 @@ size_t __stdio_write(FILE *f, const unsi
 	int iovcnt = 2;
 	ssize_t cnt;
 	for (;;) {
-		pthread_cleanup_push(cleanup, f);
-		cnt = syscall_cp(SYS_writev, f->fd, iov, iovcnt);
-		pthread_cleanup_pop(0);
+		cnt = syscall(SYS_writev, f->fd, iov, iovcnt);
 		if (cnt == rem) {
 			f->wend = f->buf + f->buf_size;
 			f->wpos = f->wbase = f->buf;
@@ -34,11 +25,8 @@ size_t __stdio_write(FILE *f, const unsi
 		}
 		rem -= cnt;
 		if (cnt > iov[0].iov_len) {
-			f->wpos = f->wbase = f->buf;
 			cnt -= iov[0].iov_len;
 			iov++; iovcnt--;
-		} else if (iovcnt == 2) {
-			f->wbase += cnt;
 		}
 		iov[0].iov_base = (char *)iov[0].iov_base + cnt;
 		iov[0].iov_len -= cnt;
--- a/src/stdio/fclose.c
+++ b/src/stdio/fclose.c
@@ -14,11 +14,11 @@ int fclose(FILE *f)
 	__unlist_locked_file(f);
 
 	if (!(perm = f->flags & F_PERM)) {
-		OFLLOCK();
+		FILE **head = __ofl_lock();
 		if (f->prev) f->prev->next = f->next;
 		if (f->next) f->next->prev = f->prev;
-		if (libc.ofl_head == f) libc.ofl_head = f->next;
-		OFLUNLOCK();
+		if (*head == f) *head = f->next;
+		__ofl_unlock();
 	}
 
 	r = fflush(f);
--- a/src/stdio/fflush.c
+++ b/src/stdio/fflush.c
@@ -35,13 +35,12 @@ int fflush(FILE *f)
 
 	r = __stdout_used ? fflush(__stdout_used) : 0;
 
-	OFLLOCK();
-	for (f=libc.ofl_head; f; f=f->next) {
+	for (f=*__ofl_lock(); f; f=f->next) {
 		FLOCK(f);
 		if (f->wpos > f->wbase) r |= __fflush_unlocked(f);
 		FUNLOCK(f);
 	}
-	OFLUNLOCK();
+	__ofl_unlock();
 	
 	return r;
 }
--- a/src/stdio/fgetwc.c
+++ b/src/stdio/fgetwc.c
@@ -1,8 +1,9 @@
 #include "stdio_impl.h"
+#include "locale_impl.h"
 #include <wchar.h>
 #include <errno.h>
 
-wint_t __fgetwc_unlocked(FILE *f)
+static wint_t __fgetwc_unlocked_internal(FILE *f)
 {
 	mbstate_t st = { 0 };
 	wchar_t wc;
@@ -10,8 +11,6 @@ wint_t __fgetwc_unlocked(FILE *f)
 	unsigned char b;
 	size_t l;
 
-	f->mode |= f->mode+1;
-
 	/* Convert character from buffer if possible */
 	if (f->rpos < f->rend) {
 		l = mbrtowc(&wc, (void *)f->rpos, f->rend - f->rpos, &st);
@@ -39,6 +38,16 @@ wint_t __fgetwc_unlocked(FILE *f)
 	return wc;
 }
 
+wint_t __fgetwc_unlocked(FILE *f)
+{
+	locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
+	if (f->mode <= 0) fwide(f, 1);
+	*ploc = f->locale;
+	wchar_t wc = __fgetwc_unlocked_internal(f);
+	*ploc = loc;
+	return wc;
+}
+
 wint_t fgetwc(FILE *f)
 {
 	wint_t c;
--- a/src/stdio/fmemopen.c
+++ b/src/stdio/fmemopen.c
@@ -110,11 +110,5 @@ FILE *fmemopen(void *restrict buf, size_
 
 	if (!libc.threaded) f->lock = -1;
 
-	OFLLOCK();
-	f->next = libc.ofl_head;
-	if (libc.ofl_head) libc.ofl_head->prev = f;
-	libc.ofl_head = f;
-	OFLUNLOCK();
-
-	return f;
+	return __ofl_add(f);
 }
--- a/src/stdio/fopen.c
+++ b/src/stdio/fopen.c
@@ -18,7 +18,7 @@ FILE *fopen(const char *restrict filenam
 	/* Compute the flags to pass to open() */
 	flags = __fmodeflags(mode);
 
-	fd = sys_open_cp(filename, flags, 0666);
+	fd = sys_open(filename, flags, 0666);
 	if (fd < 0) return 0;
 	if (flags & O_CLOEXEC)
 		__syscall(SYS_fcntl, fd, F_SETFD, FD_CLOEXEC);
--- a/src/stdio/fputwc.c
+++ b/src/stdio/fputwc.c
@@ -1,4 +1,5 @@
 #include "stdio_impl.h"
+#include "locale_impl.h"
 #include <wchar.h>
 #include <limits.h>
 #include <ctype.h>
@@ -7,8 +8,10 @@ wint_t __fputwc_unlocked(wchar_t c, FILE
 {
 	char mbc[MB_LEN_MAX];
 	int l;
+	locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
 
-	f->mode |= f->mode+1;
+	if (f->mode <= 0) fwide(f, 1);
+	*ploc = f->locale;
 
 	if (isascii(c)) {
 		c = putc_unlocked(c, f);
@@ -20,6 +23,8 @@ wint_t __fputwc_unlocked(wchar_t c, FILE
 		l = wctomb(mbc, c);
 		if (l < 0 || __fwritex((void *)mbc, l, f) < l) c = WEOF;
 	}
+	if (c==WEOF) f->flags |= F_ERR;
+	*ploc = loc;
 	return c;
 }
 
--- a/src/stdio/fputws.c
+++ b/src/stdio/fputws.c
@@ -1,23 +1,28 @@
 #include "stdio_impl.h"
+#include "locale_impl.h"
 #include <wchar.h>
 
 int fputws(const wchar_t *restrict ws, FILE *restrict f)
 {
 	unsigned char buf[BUFSIZ];
 	size_t l=0;
+	locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
 
 	FLOCK(f);
 
-	f->mode |= f->mode+1;
+	fwide(f, 1);
+	*ploc = f->locale;
 
 	while (ws && (l = wcsrtombs((void *)buf, (void*)&ws, sizeof buf, 0))+1 > 1)
 		if (__fwritex(buf, l, f) < l) {
 			FUNLOCK(f);
+			*ploc = loc;
 			return -1;
 		}
 
 	FUNLOCK(f);
 
+	*ploc = loc;
 	return l; /* 0 or -1 */
 }
 
--- a/src/stdio/fwide.c
+++ b/src/stdio/fwide.c
@@ -1,13 +1,14 @@
-#include <wchar.h>
 #include "stdio_impl.h"
-
-#define SH (8*sizeof(int)-1)
-#define NORMALIZE(x) ((x)>>SH | -((-(x))>>SH))
+#include "locale_impl.h"
 
 int fwide(FILE *f, int mode)
 {
 	FLOCK(f);
-	if (!f->mode) f->mode = NORMALIZE(mode);
+	if (mode) {
+		if (!f->locale) f->locale = MB_CUR_MAX==1
+			? C_LOCALE : UTF8_LOCALE;
+		if (!f->mode) f->mode = mode>0 ? 1 : -1;
+	}
 	mode = f->mode;
 	FUNLOCK(f);
 	return mode;
--- /dev/null
+++ b/src/stdio/ofl.c
@@ -0,0 +1,16 @@
+#include "stdio_impl.h"
+#include "libc.h"
+
+static FILE *ofl_head;
+static volatile int ofl_lock[2];
+
+FILE **__ofl_lock()
+{
+	LOCK(ofl_lock);
+	return &ofl_head;
+}
+
+void __ofl_unlock()
+{
+	UNLOCK(ofl_lock);
+}
--- /dev/null
+++ b/src/stdio/ofl_add.c
@@ -0,0 +1,11 @@
+#include "stdio_impl.h"
+
+FILE *__ofl_add(FILE *f)
+{
+	FILE **head = __ofl_lock();
+	f->next = *head;
+	if (*head) (*head)->prev = f;
+	*head = f;
+	__ofl_unlock();
+	return f;
+}
--- a/src/stdio/open_memstream.c
+++ b/src/stdio/open_memstream.c
@@ -79,11 +79,5 @@ FILE *open_memstream(char **bufp, size_t
 
 	if (!libc.threaded) f->lock = -1;
 
-	OFLLOCK();
-	f->next = libc.ofl_head;
-	if (libc.ofl_head) libc.ofl_head->prev = f;
-	libc.ofl_head = f;
-	OFLUNLOCK();
-
-	return f;
+	return __ofl_add(f);
 }
--- a/src/stdio/open_wmemstream.c
+++ b/src/stdio/open_wmemstream.c
@@ -81,11 +81,5 @@ FILE *open_wmemstream(wchar_t **bufp, si
 
 	if (!libc.threaded) f->lock = -1;
 
-	OFLLOCK();
-	f->next = libc.ofl_head;
-	if (libc.ofl_head) libc.ofl_head->prev = f;
-	libc.ofl_head = f;
-	OFLUNLOCK();
-
-	return f;
+	return __ofl_add(f);
 }
--- a/src/stdio/ungetwc.c
+++ b/src/stdio/ungetwc.c
@@ -1,4 +1,5 @@
 #include "stdio_impl.h"
+#include "locale_impl.h"
 #include <wchar.h>
 #include <limits.h>
 #include <ctype.h>
@@ -8,21 +9,19 @@ wint_t ungetwc(wint_t c, FILE *f)
 {
 	unsigned char mbc[MB_LEN_MAX];
 	int l=1;
-
-	if (c == WEOF) return c;
-
-	/* Try conversion early so we can fail without locking if invalid */
-	if (!isascii(c) && (l = wctomb((void *)mbc, c)) < 0)
-		return WEOF;
+	locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
 
 	FLOCK(f);
 
-	f->mode |= f->mode+1;
+	if (f->mode <= 0) fwide(f, 1);
+	*ploc = f->locale;
 
 	if (!f->rpos) __toread(f);
-	if (!f->rpos || f->rpos < f->buf - UNGET + l) {
+	if (!f->rpos || f->rpos < f->buf - UNGET + l || c == WEOF ||
+	    (!isascii(c) && (l = wctomb((void *)mbc, c)) < 0)) {
 		FUNLOCK(f);
-		return EOF;
+		*ploc = loc;
+		return WEOF;
 	}
 
 	if (isascii(c)) *--f->rpos = c;
@@ -31,5 +30,6 @@ wint_t ungetwc(wint_t c, FILE *f)
 	f->flags &= ~F_EOF;
 
 	FUNLOCK(f);
+	*ploc = loc;
 	return c;
 }
--- a/src/stdio/vfwprintf.c
+++ b/src/stdio/vfwprintf.c
@@ -293,7 +293,10 @@ static int wprintf_core(FILE *f, const w
 			if ((fl&LEFT_ADJ)) fprintf(f, "%.*s", w-p, "");
 			l=w;
 			continue;
+		case 'm':
+			arg.p = strerror(errno);
 		case 's':
+			if (!arg.p) arg.p = "(null)";
 			bs = arg.p;
 			if (p<0) p = INT_MAX;
 			for (i=l=0; l<p && (i=mbtowc(&wc, bs, MB_LEN_MAX))>0; bs+=i, l++);
@@ -356,7 +359,7 @@ int vfwprintf(FILE *restrict f, const wc
 	}
 
 	FLOCK(f);
-	f->mode |= f->mode+1;
+	fwide(f, 1);
 	olderr = f->flags & F_ERR;
 	f->flags &= ~F_ERR;
 	ret = wprintf_core(f, fmt, &ap2, nl_arg, nl_type);
--- a/src/stdio/vfwscanf.c
+++ b/src/stdio/vfwscanf.c
@@ -104,7 +104,7 @@ int vfwscanf(FILE *restrict f, const wch
 
 	FLOCK(f);
 
-	f->mode |= f->mode+1;
+	fwide(f, 1);
 
 	for (p=fmt; *p; p++) {
 
--- a/src/string/strverscmp.c
+++ b/src/string/strverscmp.c
@@ -2,40 +2,33 @@
 #include <ctype.h>
 #include <string.h>
 
-int strverscmp(const char *l, const char *r)
+int strverscmp(const char *l0, const char *r0)
 {
-	int haszero=1;
-	while (*l==*r) {
-		if (!*l) return 0;
+	const unsigned char *l = (const void *)l0;
+	const unsigned char *r = (const void *)r0;
+	size_t i, dp, j;
+	int z = 1;
 
-		if (*l=='0') {
-			if (haszero==1) {
-				haszero=0;
-			}
-		} else if (isdigit(*l)) {
-			if (haszero==1) {
-				haszero=2;
-			}
-		} else {
-			haszero=1;
-		}
-		l++; r++;
+	/* Find maximal matching prefix and track its maximal digit
+	 * suffix and whether those digits are all zeros. */
+	for (dp=i=0; l[i]==r[i]; i++) {
+		int c = l[i];
+		if (!c) return 0;
+		if (!isdigit(c)) dp=i+1, z=1;
+		else if (c!='0') z=0;
 	}
-	if (haszero==1 && (*l=='0' || *r=='0')) {
-		haszero=0;
-	}
-	if ((isdigit(*l) && isdigit(*r) ) && haszero) {
-		size_t lenl=0, lenr=0;
-		while (isdigit(l[lenl]) ) lenl++;
-		while (isdigit(r[lenr]) ) lenr++;
-		if (lenl==lenr) {
-			return (*l -  *r);
-		} else if (lenl>lenr) {
-			return 1;
-		} else {
-			return -1;
-		}
-	} else {
-		return (*l -  *r);
+
+	if (l[dp]!='0' && r[dp]!='0') {
+		/* If we're not looking at a digit sequence that began
+		 * with a zero, longest digit string is greater. */
+		for (j=i; isdigit(l[j]); j++)
+			if (!isdigit(r[j])) return 1;
+		if (isdigit(r[j])) return -1;
+	} else if (z && dp<i && (isdigit(l[i]) || isdigit(r[i]))) {
+		/* Otherwise, if common prefix of digit sequence is
+		 * all zeros, digits order less than non-digits. */
+		return (unsigned char)(l[i]-'0') - (unsigned char)(r[i]-'0');
 	}
+
+	return l[i] - r[i];
 }
--- a/src/thread/__tls_get_addr.c
+++ b/src/thread/__tls_get_addr.c
@@ -8,9 +8,9 @@ void *__tls_get_addr(size_t *v)
 	__attribute__((__visibility__("hidden")))
 	void *__tls_get_new(size_t *);
 	if (v[0]<=(size_t)self->dtv[0])
-		return (char *)self->dtv[v[0]]+v[1];
+		return (char *)self->dtv[v[0]]+v[1]+DTP_OFFSET;
 	return __tls_get_new(v);
 #else
-	return (char *)self->dtv[1]+v[1];
+	return (char *)self->dtv[1]+v[1]+DTP_OFFSET;
 #endif
 }
--- /dev/null
+++ b/src/thread/__unmapself.c
@@ -0,0 +1,29 @@
+#include "pthread_impl.h"
+#include "atomic.h"
+#include "syscall.h"
+/* cheat and reuse CRTJMP macro from dynlink code */
+#include "dynlink.h"
+
+static volatile int lock;
+static void *unmap_base;
+static size_t unmap_size;
+static char shared_stack[256];
+
+static void do_unmap()
+{
+	__syscall(SYS_munmap, unmap_base, unmap_size);
+	__syscall(SYS_exit);
+}
+
+void __unmapself(void *base, size_t size)
+{
+	int tid=__pthread_self()->tid;
+	char *stack = shared_stack + sizeof shared_stack;
+	stack -= (uintptr_t)stack % 16;
+	while (lock || a_cas(&lock, 0, tid))
+		a_spin();
+	__syscall(SYS_set_tid_address, &lock);
+	unmap_base = base;
+	unmap_size = size;
+	CRTJMP(do_unmap, stack);
+}
--- a/src/thread/mips/__unmapself.s
+++ b/src/thread/mips/__unmapself.s
@@ -2,6 +2,7 @@
 .global __unmapself
 .type   __unmapself,@function
 __unmapself:
+	move $sp, $25
 	li $2, 4091
 	syscall
 	li $4, 0
--- a/src/thread/pthread_create.c
+++ b/src/thread/pthread_create.c
@@ -191,8 +191,9 @@ int __pthread_create(pthread_t *restrict
 	if (!libc.can_do_threads) return ENOSYS;
 	self = __pthread_self();
 	if (!libc.threaded) {
-		for (FILE *f=libc.ofl_head; f; f=f->next)
+		for (FILE *f=*__ofl_lock(); f; f=f->next)
 			init_file_lock(f);
+		__ofl_unlock();
 		init_file_lock(__stdin_used);
 		init_file_lock(__stdout_used);
 		init_file_lock(__stderr_used);
@@ -231,7 +232,8 @@ int __pthread_create(pthread_t *restrict
 		if (guard) {
 			map = __mmap(0, size, PROT_NONE, MAP_PRIVATE|MAP_ANON, -1, 0);
 			if (map == MAP_FAILED) goto fail;
-			if (__mprotect(map+guard, size-guard, PROT_READ|PROT_WRITE)) {
+			if (__mprotect(map+guard, size-guard, PROT_READ|PROT_WRITE)
+			    && errno != ENOSYS) {
 				__munmap(map, size);
 				goto fail;
 			}
--- a/src/thread/sh/__set_thread_area.s
+++ b/src/thread/sh/__set_thread_area.s
@@ -1,6 +0,0 @@
-.global __set_thread_area
-.type   __set_thread_area, @function
-__set_thread_area:
-	ldc r4, gbr
-	rts
-	 mov #0, r0
--- a/src/thread/sh/__unmapself.s
+++ b/src/thread/sh/__unmapself.s
@@ -1,9 +1,9 @@
 .text
-.global __unmapself
-.type   __unmapself, @function
-__unmapself:
+.global __unmapself_sh_mmu
+.type   __unmapself_sh_mmu, @function
+__unmapself_sh_mmu:
 	mov   #91, r3  ! SYS_munmap
-	trapa #18
+	trapa #31
 
 	or    r0, r0
 	or    r0, r0
@@ -13,7 +13,7 @@ __unmapself:
 
 	mov   #1, r3   ! SYS_exit
 	mov   #0, r4
-	trapa #17
+	trapa #31
 
 	or    r0, r0
 	or    r0, r0
--- a/src/thread/sh/clone.s
+++ b/src/thread/sh/clone.s
@@ -17,7 +17,7 @@ __clone:
 	mov.l @r15,     r6   ! r6 = ptid
 	mov.l @(8,r15), r7   ! r7 = ctid
 	mov.l @(4,r15), r0   ! r0 = tls
-	trapa #21
+	trapa #31
 
 	or r0, r0
 	or r0, r0
@@ -38,7 +38,7 @@ __clone:
 
 	mov   #1, r3   ! __NR_exit
 	mov   r0, r4
-	trapa #17
+	trapa #31
 
 	or   r0, r0
 	or   r0, r0
--- a/src/thread/sh/syscall_cp.s
+++ b/src/thread/sh/syscall_cp.s
@@ -31,7 +31,7 @@ L1:	.long __cancel@PLT-(1b-.)
 	mov.l @(4,r15), r7
 	mov.l @(8,r15), r0
 	mov.l @(12,r15), r1
-	trapa #22
+	trapa #31
 
 __cp_end:
 	! work around hardware bug
--- a/src/time/__tz.c
+++ b/src/time/__tz.c
@@ -125,7 +125,8 @@ static void do_tzset()
 		"/usr/share/zoneinfo/\0/share/zoneinfo/\0/etc/zoneinfo/\0";
 
 	s = getenv("TZ");
-	if (!s || !*s) s = "/etc/localtime";
+	if (!s) s = "/etc/localtime";
+	if (!*s) s = __gmt;
 
 	if (old_tz && !strcmp(s, old_tz)) return;
 
--- a/src/unistd/sh/pipe.s
+++ b/src/unistd/sh/pipe.s
@@ -2,7 +2,7 @@
 .type   pipe, @function
 pipe:
 	mov    #42, r3
-	trapa  #17
+	trapa  #31
 
 	! work around hardware bug
 	or     r0, r0
--- /dev/null
+++ b/tools/ld.musl-clang.in
@@ -0,0 +1,51 @@
+#!/bin/sh
+cc="@CC@"
+libc_lib="@LIBDIR@"
+ldso="@LDSO@"
+cleared=
+shared=
+userlinkdir=
+userlink=
+
+for x ; do
+    test "$cleared" || set -- ; cleared=1
+
+    case "$x" in
+        -L-user-start)
+            userlinkdir=1
+            ;;
+        -L-user-end)
+            userlinkdir=
+            ;;
+        -L*)
+            test "$userlinkdir" && set -- "$@" "$x"
+            ;;
+        -l-user-start)
+            userlink=1
+            ;;
+        -l-user-end)
+            userlink=
+            ;;
+        crtbegin*.o|crtend*.o)
+            set -- "$@" $($cc -print-file-name=$x)
+            ;;
+        -lgcc|-lgcc_eh)
+            file=lib${x#-l}.a
+            set -- "$@" $($cc -print-file-name=$file)
+            ;;
+        -l*)
+            test "$userlink" && set -- "$@" "$x"
+            ;;
+        -shared)
+            shared=1
+            set -- "$@" -shared
+            ;;
+        -sysroot=*|--sysroot=*)
+            ;;
+        *)
+            set -- "$@" "$x"
+            ;;
+    esac
+done
+
+exec $($cc -print-prog-name=ld) -nostdlib "$@" -lc -dynamic-linker "$ldso"
--- /dev/null
+++ b/tools/musl-clang.in
@@ -0,0 +1,35 @@
+#!/bin/sh
+cc="@CC@"
+libc="@PREFIX@"
+libc_inc="@INCDIR@"
+libc_lib="@LIBDIR@"
+thisdir="`cd "$(dirname "$0")"; pwd`"
+
+# prevent clang from running the linker (and erroring) on no input.
+sflags=
+eflags=
+for x ; do
+    case "$x" in
+        -l*) input=1 ;;
+        *) input= ;;
+    esac
+    if test "$input" ; then
+        sflags="-l-user-start"
+        eflags="-l-user-end"
+        break
+    fi
+done
+
+exec $cc \
+    -B"$thisdir" \
+    -fuse-ld=musl-clang \
+    -static-libgcc \
+    -nostdinc \
+    --sysroot "$libc" \
+    -isystem "$libc_inc" \
+    -L-user-start \
+    $sflags \
+    "$@" \
+    $eflags \
+    -L"$libc_lib" \
+    -L-user-end