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* math: fix sinh overflows in non-nearest roundingSzabolcs Nagy2020-02-217-10/+12
| | | | | | | | | | | | | | The final rounding operation should be done with the correct sign otherwise huge results may incorrectly get rounded to or away from infinity in upward or downward rounding modes. This affected sinh and sinhf which set the sign on the result after a potentially overflowing mul. There may be other non-nearest rounding issues, but this was a known long standing issue with large ulp error (depending on how ulp is defined near infinity). The fix should have no effect on sinh and sinhf performance but may have a tiny effect on cosh and coshf.
* math: fix __rem_pio2 in non-nearest rounding modesSzabolcs Nagy2020-02-213-3/+41
| | | | | | | | | | | | | | | | | | Handle when after reduction |y| > pi/4+tiny. This happens in directed rounding modes because the fast round to int code does not give the nearest integer. In such cases the reduction may not be symmetric between x and -x so e.g. cos(x)==cos(-x) may not hold (but polynomial evaluation is not symmetric either with directed rounding so fixing that would require more changes with bigger performance impact). The fix only adds two predictable branches in nearest rounding mode, simple ubenchmark does not show relevant performance regression in nearest rounding mode. The code could be improved: e.g reducing the medium size threshold such that two step reduction is enough instead of three, and the single precision case can avoid the issue by doing the round to int differently, but this fix was kept minimal.
* release 1.2.0 v1.2.0Rich Felker2020-02-202-1/+37
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* fix remaining direct use of stat syscalls outside fstatat.cRich Felker2020-02-124-6/+10
| | | | | | | | | | | | | | | | | | because struct stat is no longer assumed to correspond to the structure used by the stat-family syscalls, it's not valid to make any of these syscalls directly using a buffer of type struct stat. commit 9493892021eac4edf1776d945bcdd3f7a96f6978 moved all logic around this change for stat-family functions into fstatat.c, making the others wrappers for it. but a few other direct uses of the syscall were overlooked. the ones in tmpnam/tempnam are harmless since the syscalls are just used to test for file existence. however, the uses in fchmodat and __map_file depend on getting accurate file properties, and these functions may actually have been broken one or more mips variants due to removal of conversion hacks from syscall_arch.h. as a low-risk fix, simply use struct kstat in place of struct stat in the affected places.
* remove i386 asm for single and double precision exp-family functionsRich Felker2020-02-069-62/+3
| | | | | | | | | these did not truncate excess precision in the return value. fixing them looks like considerable work, and the current C code seems to outperform them significantly anyway. long double functions are left in place because they are not subject to excess precision issues and probably better than the C code.
* rename i386 exp.s to exp_ld.sRich Felker2020-02-062-0/+1
| | | | this commit is for the sake of reviewable history.
* fix excess precision in return value of i386 log-family functionsRich Felker2020-02-068-0/+20
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* fix excess precision in return value of i386 acos[f] and asin[f]Rich Felker2020-02-066-42/+75
| | | | | analogous to commit 1c9afd69051a64cf085c6fb3674a444ff9a43857 for atan[2][f].
* fix excess precision in return value of i386 atan[2][f]Rich Felker2020-02-064-2/+8
| | | | | | | | | | | | for functions implemented in C, this is a requirement of C11 (F.6); strictly speaking that text does not apply to standard library functions, but it seems to be intended to apply to them, and C2x is expected to make it a requirement. failure to drop excess precision is particularly bad for inverse trig functions, where a value with excess precision can be outside the range of the function (entire range, or range for a particular subdomain), breaking reasonable invariants a caller may expect.
* remove legacy time32 timer[fd] syscalls from public syscall.hRich Felker2020-02-0510-36/+52
| | | | | | | this extends commit 5a105f19b5aae79dd302899e634b6b18b3dcd0d6, removing timer[fd]_settime and timer[fd]_gettime. the timerfd ones are likely to have been used in software that started using them before it could rely on libc exposing functions.
* remove further legacy time32 clock syscalls from public syscall.hRich Felker2020-02-0510-36/+52
| | | | | this extends commit 5a105f19b5aae79dd302899e634b6b18b3dcd0d6, removing clock_settime, clock_getres, clock_nanosleep, and settimeofday.
* fix incorrect results for catanf and catanl with some inputsRich Felker2020-02-052-26/+2
| | | | | | catan was fixed in 10e4bd3780050e75b72aac5d85c31816419bb17d but the same bug in catanf and catanl was overlooked. the patch is completely analogous.
* move riscv64 register index constants to signal.hRich Felker2020-02-042-6/+9
| | | | | | under _GNU_SOURCE for namespace cleanliness, analogous to other archs. the original placement in sys/reg.h seems not to have been motivated; such a header isn't even present on other implementations.
* remove legacy clock_gettime and gettimeofday from public syscall.hRich Felker2020-01-3010-18/+25
| | | | | | | | | | | | | | | | | | | | | | | some nontrivial number of applications have historically performed direct syscalls for these operations rather than using the public functions. such usage is invalid now that time_t is 64-bit and these syscalls no longer match the types they are used with, and it was already harmful before (by suppressing use of vdso). since syscall() has no type safety, incorrect usage of these syscalls can't be caught at compile-time. so, without manually inspecting or running additional tools to check sources, the risk of such errors slipping through is high. this patch renames the syscalls on 32-bit archs to clock_gettime32 and gettimeofday_time32, so that applications using the original names will fail to build without being fixed. note that there are a number of other syscalls that may also be unsafe to use directly after the time64 switchover, but (1) these are the main two that seem to be in widespread use, and (2) most of the others continue to have valid usage with a null timeval/timespec argument, as the argument is an optional timeout or similar.
* fix misleading use of _POSIX_VDISABLE in sys/ttydefaults.hRich Felker2020-01-291-5/+0
| | | | | | _POSIX_VDISABLE is only visible if unistd.h has already been included, so conditional use of it here makes no sense. the value is always 0 anyway; it does not vary.
* fix unprotected macro argument in sys/ttydefaults.hRich Felker2020-01-291-1/+1
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* math/x32: correct lrintl.s for 32-bit longAlexander Monakov2020-01-271-2/+2
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* move struct dirent to bits header, allow NAME_MAX to varyRich Felker2020-01-253-12/+15
| | | | | | this is not necessary for linux but is a simple, inexpensive change to make that facilitates ports to systems where NAME_MAX needs to be longer.
* fix riscv64 a_cas inline asm operand sign extensionLuís Marques2020-01-221-1/+1
| | | | | | | | This patch adds an explicit cast to the int arguments passed to the inline asm used in the RISC-V's implementation of `a_cas`, to ensure that they are properly sign extended to 64 bits. They aren't automatically sign extended by Clang, and GCC technically also doesn't guarantee that they will be sign extended.
* fix incorrect escaping in add-cfi.*.awk scriptsWill Dietz2020-01-202-2/+2
| | | | gawk 5 complains.
* add thumb2 support to arm assembler memcpyAndre McCurdy2020-01-162-6/+9
| | | | | | | For Thumb2 compatibility, replace two instances of a single instruction "orr with a variable shift" with the two instruction equivalent. Neither of the replacements are in a performance critical loop.
* fix incorrect __hwcap seen in dynamic-linked __set_thread_areaRich Felker2020-01-151-1/+1
| | | | | | | | | | | | | the bug fixed in commit b82cd6c78d812d38c31febba5a9e57dbaa7919c4 was mostly masked on arm because __hwcap was zero at the point of the call from the dynamic linker to __set_thread_area, causing the access to libc.auxv to be skipped and kuser_helper versions of TLS access and atomics to be used instead of the armv6 or v7 versions. however, on kernels with kuser_helper removed for hardening it would crash. since __set_thread_area potentially uses __hwcap, it must be initialized before the function is called. move the AT_HWCAP lookup from stage 3 to stage 2b.
* define RLIMIT_RTTIME, bump RLIMIT_NLIMITSLeah Neukirchen2020-01-111-1/+2
| | | | This macro exists since Linux 2.6.25 and is defined in glibc since 2011.
* fix wcwidth wrongly returning 0 for most of planes 4 and upRich Felker2020-01-011-1/+1
| | | | | | commit 1b0ce9af6d2aa7b92edaf3e9c631cb635bae22bd introduced this bug back in 2012 and it was never noticed, presumably since the affected planes are essentially unused in Unicode.
* unconditonally define alloca as __builtin_allocaMichael Forney2020-01-011-2/+0
| | | | | | | | This enables alternative compilers, which may not define __GNUC__, to implement alloca, which is still fairly widely used. This is similar to how stdarg.h already works in musl; compilers must implement __builtin_va_arg, there is no fallback definition.
* update COPYRIGHT yearRich Felker2020-01-011-1/+1
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* remove gratuitous aligned attribute from __ptrace_syscall_infoRich Felker2020-01-011-1/+2
| | | | | | | | | | | | | | | | | this change was discussed on the mailing list thread for the linux uapi v5.3 patches, and submitted as a v2 patch, but overlooked when I applied the patches much later. revert commit f291c09ec90e2514c954020e9b9bdb30e2adfc7f and apply the v2 as submitted; the net change is just padding. notes by Szabolcs Nagy follow: compared to the linux uapi (and glibc) a padding is used instead of aligned attribute for keeping the layout the same across targets, this means the alignment of the struct may be different on some targets (e.g. m68k where uint64_t is 2 byte aligned) but that should not affect syscalls and this way the abi does not depend on nonstandard extensions.
* fix fdpic regression in dynamic linker with overly smart compilersRich Felker2020-01-011-2/+8
| | | | | | | | | | | at least gcc 9 broke execution of DT_INIT/DT_FINI for fdpic archs (presently only sh) by recognizing that the stores to the compound-literal function descriptor constructed to call them were dead stores. there's no way to make a "may_alias function", so instead launder the descriptor through an asm-statement barrier. in practice just making the compound literal volatile seemed to have worked too, but this should be less of a hack and more accurately convey the semantics of what transformations are not valid.
* fix crashing ldso on archs where __set_thread_area examines auxvRich Felker2019-12-311-13/+13
| | | | | | | | commit 1c84c99913bf1cd47b866ed31e665848a0da84a2 moved the call to __init_tp above the initialization of libc.auxv, inadvertently breaking archs where __set_thread_area examines auxv for the sake of determining the TLS/atomic model needed at runtime. this broke armv6 and sh2.
* move stage3_func typedef out of shared internal dynlink.h headerRich Felker2019-12-312-1/+2
| | | | this interface contract is entirely internal to dynlink.c.
* mips: add clone3 syscall numbers from linux v5.4Szabolcs Nagy2019-12-303-0/+3
| | | | | | | the syscall numbers were reserved in v5.3 but not wired up on mips, see linux commit 0671c5b84e9e0a6d42d22da9b5d093787ac1c5f3 MIPS: Wire up clone3 syscall
* mips: add hwcap bits from linux v5.4Szabolcs Nagy2019-12-301-0/+11
| | | | | | | | mips application specific isa extensions were previously not exported in hwcaps so userspace could not apply optimized code at runtime. linux commit 38dffe1e4dde1d3174fdce09d67370412843ebb5 MIPS: elf_hwcap: Export userspace ASEs
* sys/wait.h: add P_PIDFD from linux v5.4Szabolcs Nagy2019-12-301-1/+2
| | | | | | | | allows waiting on a pidfd, in the future it might allow retrieving the exit status by a non-parent process, see linux commit 3695eae5fee0605f316fbaad0b9e3de791d7dfaf pidfd: add P_PIDFD to waitid()
* netinet/tcp.h: add new tcp_info fields from linux v5.4Szabolcs Nagy2019-12-301-0/+2
| | | | | | | | | | | | tcpi_rcv_ooopack for tracking connection quality: linux commit f9af2dbbfe01def62765a58af7fbc488351893c3 tcp: Add TCP_INFO counter for packets received out-of-order tcpi_snd_wnd peer window size for diagnosing tcp performance problems: linux commit 8f7baad7f03543451af27f5380fc816b008aa1f2 tcp: Add snd_wnd to TCP_INFO
* sys/prctl.h: add PR_*_TAGGED_ADDR_* from linux v5.4Szabolcs Nagy2019-12-301-0/+4
| | | | | | | | | per thread prctl commands to relax the syscall abi such that top bits of user pointers are ignored in the kernel. this allows the use of those bits by hwasan or by mte to color pointers and memory on aarch64: linux commit 63f0c60379650d82250f22e4cf4137ef3dc4f43d arm64: Introduce prctl() options to control the tagged user addresses ABI
* sys/mman.h: add MADV_COLD and MADV_PAGEOUT from linux v5.4Szabolcs Nagy2019-12-301-0/+2
| | | | | | | | | | | | | | | | | | These were mainly introduced so android can optimize the memory usage of unused apps. MADV_COLD hints that the memory range is currently not needed (unlike with MADV_FREE the content is not garbage, it needs to be swapped): linux commit 9c276cc65a58faf98be8e56962745ec99ab87636 mm: introduce MADV_COLD MADV_PAGEOUT hints that the memory range is not needed for a long time so it can be reclaimed immediately independently of memory pressure (unlike with MADV_DONTNEED the content is not garbage): linux commit 1a4e58cce84ee88129d5d49c064bd2852b481357 mm: introduce MADV_PAGEOUT
* add clone3 syscall number from linux v5.3Szabolcs Nagy2019-12-3011-0/+12
| | | | | | | | | | | | | | the syscall number is reserved on all targets, but it is not wired up on all targets, see linux commit 8f6ccf6159aed1f04c6d179f61f6fb2691261e84 Merge tag 'clone3-v5.3' of ... brauner/linux linux commit 8f3220a806545442f6f26195bc491520f5276e7c arch: wire-up clone3() syscall linux commit 7f192e3cd316ba58c88dfa26796cf77789dd9872 fork: add clone3
* add pidfd_open syscall number from linux v5.3Szabolcs Nagy2019-12-3016-0/+16
| | | | | | | | | | see linux commit 7615d9e1780e26e0178c93c55b73309a5dc093d7 arch: wire-up pidfd_open() linux commit 32fcb426ec001cb6d5a4a195091a8486ea77e2df pid: add pidfd_open()
* sys/ptrace.h: add PTRACE_GET_SYSCALL_INFO from linux v5.3Szabolcs Nagy2019-12-301-0/+28
| | | | | | | | | | ptrace API to get details of the syscall the tracee is blocked in, see linux commit 201766a20e30f982ccfe36bebfad9602c3ff574a ptrace: add PTRACE_GET_SYSCALL_INFO request the align attribute was used to keep the layout the same across targets e.g. on m68k uint32_t is 2 byte aligned, this helps with compat ptrace.
* sys/socket.h: add SO_DETACH_REUSEPORT_BPF from linux v5.3Szabolcs Nagy2019-12-301-0/+1
| | | | | | | see linux commit 99f3a064bc2e4bd5fe50218646c5be342f2ad18c bpf: net: Add SO_DETACH_REUSEPORT_BPF
* netinet/if_ether.h: add ETH_P_LLDP from linux v5.3Szabolcs Nagy2019-12-301-0/+1
| | | | | | | see linux commit c54c2c72b2b90a3ba61b8cad032a578ce2bf5b35 net: Add a define for LLDP ethertype
* netinet/tcp.h: add TCP_TX_DELAY from linux v5.3Szabolcs Nagy2019-12-301-0/+1
| | | | | | | see linux commit a842fe1425cb20f457abd3f8ef98b468f83ca98b tcp: add optional per socket transmit delay
* fix types for mips sigcontext/mcontext_t regset membersKhem Raj2019-12-301-2/+6
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* spare archs without time32 legacy the cost of ioctl fallback conversionsRich Felker2019-12-221-1/+1
| | | | | | adding this condition makes the entire convert_ioctl_struct function and compat_map table statically unreachable, and thereby optimized out by dead code elimination, on archs where they are not needed.
* add further ioctl time64 fallback conversion for device-specific commandRich Felker2019-12-221-0/+3
| | | | | | | | VIDIOC_OMAP3ISP_STAT_REQ is a device-specific command for the omap3isp video device. the command number is in a device-private range and therefore could theoretically be used by other devices too in the future, but problematic clashes should not be able to arise without intentional misuse.
* add uapi guards for new netinet/ip.h conflict with struct iphdrA. Wilcox2019-12-221-0/+2
| | | | | | | | This ensures that the musl definition of 'struct iphdr' does not conflict with the Linux kernel UAPI definition of it. Some software, i.e. net-tools, will not compile against 5.4 kernel headers without this patch and the corresponding Linux kernel patch.
* adjust utmpx struct layout for time64, 32-/64-bit arch compatRich Felker2019-12-221-1/+6
| | | | | | | | | | | | | | | | | | | | | since time64 switchover has changed the size and layout of the struct anyway, take the opportunity to fix it up so that it can be shared between 32- and 64-bit ABIs on the same system as long as byte order matches. the ut_type member is explicitly padded to make up for m68k having only 2-byte alignment; explicit padding has no effect on other archs. ut_session is changed from long to int, with endian-matched padding. this affects 64-bit archs as well, but brings the type into alignment with glibc's x86_64 struct, so it should not break software, and does not break on-disk format. the semantic type is int (pid-like) anyway. the padding produces correct alignment for the ut_tv member on 32-bit archs that don't naturally align it, so that ABI matches 64-bit. this type is presently not used anywhere in the ABI between libc and libc consumers; it's only used between pairs of consumers if a third-party utmp library using the system utmpx.h is in use.
* fix elf_prstatus regression on time64, existing wrong definition on x32Rich Felker2019-12-221-4/+3
| | | | | | | | | | | | | | | | | | | the elf_prstatus structure is used in core dumps, and the timeval structures in it are longs matching the elf class, *not* the kernel "old timeval" for the arch. this means using timeval here for x32 was always wrong, despite kernel uapi headers and glibc also exposing it this way, and of course it's wrong for any arch with 64-bit time_t. rather than just changing the type on affected archs, use a tagless struct containing long tv_sec and tv_usec members in place of the timevals. this intentionally breaks use of them as timevals (e.g. assignment, passing address, etc.) on 64-bit archs as well so that any usage unsafe for 32-bit archs is caught even in software that only gets tested on 64-bit archs. from what I could gather, there is not any software using these members anyway. the only reason they need to be fixed to begin with is that the only members which are commonly used, the saved registers, follow the time members and have the wrong offset if the time members are sized incorrectly.
* don't continue looping through ioctl compat_map after finding matchRich Felker2019-12-211-0/+1
| | | | | | there's only one matching entry for any given command so this had no functional distinction, but additional loops are pointless and wasteful.
* revert unwanted and inadvertent change that slipped into mmap.cRich Felker2019-12-201-1/+0
| | | | | | | commit ae388becb529428ac926da102f1d025b3c3968da accidentally introduced #define SYSCALL_NO_TLS 1 in mmap.c, which was probably a stale change left around from unrelated syscall timing measurements. reverse it.
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