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* bits/syscall.h: add __NR_fchmodat2 from linux v6.6Gaël PORTAY2024-02-221-0/+1
| | | | | | | | | | | the linux fchmodat syscall lacks a flag argument that is necessary to implement the posix api, see linux commit 09da082b07bbae1c11d9560c8502800039aebcea fs: Add fchmodat2() linux commit 78252deb023cf0879256fcfbafe37022c390762b arch: Register fchmodat2, usually as syscall 452
* bits/syscall.h: add cachestat from linux v6.4Gaël PORTAY2024-02-221-0/+1
| | | | | | | | | | see linux commit cf264e1329fb0307e044f7675849f9f38b44c11a cachestat: implement cachestat syscall linux commit 946e697c69ffeeefdd84dad90eac307284df46be cachestat: wire up cachestat for other architectures
* bits/syscall.h: add set_mempolicy_home_node from linux v5.17Gaël PORTAY2024-02-221-0/+1
| | | | | | | | | | see linux commit c6018b4b254971863bd0ad36bb5e7d0fa0f0ddb0 mm/mempolicy: add set_mempolicy_home_node syscall linux commit 21b084fdf2a49ca1634e8e360e9ab6f9ff0dee11 mm/mempolicy: wire up syscall set_mempolicy_home_node
* bits/syscall.h: add futex_waitv from linux v5.16Gaël PORTAY2024-02-221-0/+1
| | | | | | | | | | | | | | | | | | | see linux commit 039c0ec9bb77446d7ada7f55f90af9299b28ca49 futex,x86: Wire up sys_futex_waitv() linux commit ea7c45fde5aa3e761aaddb7902a31a95cb120e7b futex,arm: Wire up sys_futex_waitv() linux commit b3ff2881ba18b852f79f5476d7631940071f1adb MIPS: syscalls: Wire up futex_waitv syscall linux commit 6c122360cf2f4c5a856fcbd79b4485b7baec942a s390: wire up sys_futex_waitv system call linux commit a0eb2da92b715d0c97b96b09979689ea09faefe6 futex: Wireup futex_waitv syscall
* bits/syscall.h: add process_mrelease from linux v5.15Rich Felker2024-02-221-0/+1
| | | | | | | | | | see linux commit 884a7e5964e06ed93c7771c0d7cf19c09a8946f1 mm: introduce process_mrelease system call linux commit dce49103962840dd61423d7627748d6c558d58c5 mm: wire up syscall process_mrelease
* bits/syscall.h: add landlock syscalls from linux v5.13Szabolcs Nagy2022-03-081-0/+3
| | | | | | | | | | | | | | | | | see linux commit a49f4f81cb48925e8d7cbd9e59068f516e984144 arch: Wire up Landlock syscalls linuxcommit 17ae69aba89dbfa2139b7f8024b757ab3cc42f59 Merge tag 'landlock_v34' of ... jmorris/linux-security Landlock provides for unprivileged application sandboxing. The goal of Landlock is to enable to restrict ambient rights (e.g. global filesystem access) for a set of processes. Landlock is inspired by seccomp-bpf but instead of filtering syscalls and their raw arguments, a Landlock rule can restrict the use of kernel objects like file hierarchies, according to the kernel semantic.
* bits/syscall.h: add mount_setattr from linux v5.12Szabolcs Nagy2022-03-081-0/+1
| | | | | | | | new syscall to change the properties of a mount or a mount tree using file descriptors which the new mount api is based on, see linux commit 2a1867219c7b27f928e2545782b86daaf9ad50bd fs: add mount_setattr()
* bits/syscall.h: add epoll_pwait2 from linux v5.11Szabolcs Nagy2022-03-081-0/+1
| | | | | | | | | | | | see linux commit b0a0c2615f6f199a656ed8549d7dce625d77aa77 epoll: wire up syscall epoll_pwait2 linux commit 58169a52ebc9a733aeb5bea857bc5daa71a301bb epoll: add syscall epoll_pwait2 epoll_wait with struct timespec timeout instead of int. no time32 variant.
* bits/syscall.h: add process_madvise from linux v5.10Szabolcs Nagy2021-02-151-0/+1
| | | | | | | | | mainly added to linux to allow a central process management service in android to give MADV_COLD|PAGEOUT hints for other processes, see linux commit ecb8ac8b1f146915aa6b96449b66dd48984caacc mm/madvise: introduce process_madvise() syscall: an external memory hinting API
* bits/syscall.h: add __NR_close_range from linux v5.9Szabolcs Nagy2020-11-291-0/+1
| | | | | | | | | | see linux commit 9b4feb630e8e9801603f3cab3a36369e3c1cf88d arch: wire-up close_range() linux commit 278a5fbaed89dacd04e9d052f4594ffd0e0585de open: add close_range()
* bits/syscall.h: add __NR_faccessat2 from linux v5.8Szabolcs Nagy2020-09-091-0/+1
| | | | | | | | the linux faccessat syscall lacks a flag argument that is necessary to implement the posix api, see linux commit c8ffd8bcdd28296a198f237cc595148a8d4adfbe vfs: add faccessat2 syscall
* add pidfd_getfd and openat2 syscall numbers from linux v5.6Szabolcs Nagy2020-09-091-0/+2
| | | | | | | | | | | | | | | | | | | also added clone3 on sh and m68k, on sh it's still missing (not yet wired up), but reserved so safe to add. see linux commit fddb5d430ad9fa91b49b1d34d0202ffe2fa0e179 open: introduce openat2(2) syscall linux commit 9a2cef09c801de54feecd912303ace5c27237f12 arch: wire up pidfd_getfd syscall linux commit 8649c322f75c96e7ced2fec201e123b2b073bf09 pid: Implement pidfd_getfd syscall linux commit e8bb2a2a1d51511e6b3f7e08125d52ec73c11139 m68k: Wire up clone3() syscall
* remove redundant pthread struct members repeated for layout purposesRich Felker2020-08-271-2/+0
| | | | | | | dtv_copy, canary2, and canary_at_end existed solely to match multiple ABI and asm-accessed layouts simultaneously. now that pthread_arch.h can be included before struct __pthread is defined, the struct layout can depend on macros defined by pthread_arch.h.
* deduplicate __pthread_self thread pointer adjustment out of each archRich Felker2020-08-271-3/+3
| | | | | | | | | | | | | | | | the adjustment made is entirely a function of TLS_ABOVE_TP and TP_OFFSET. aside from avoiding repetition of the TP_OFFSET value and arithmetic, this change makes pthread_arch.h independent of the definition of struct __pthread from pthread_impl.h. this in turn will allow inclusion of pthread_arch.h to be moved to the top of pthread_impl.h so that it can influence the definition of the structure. previously, arch files were very inconsistent about the type used for the thread pointer. this change unifies the new __get_tp interface to always use uintptr_t, which is the most correct when performing arithmetic that may involve addresses outside the actual pointed-to object (due to TP_OFFSET).
* deduplicate TP_ADJ logic out of each arch, replace with TP_OFFSETRich Felker2020-08-241-1/+1
| | | | | | the only part of TP_ADJ that was not uniquely determined by TLS_ABOVE_TP was the 0x7000 adjustment used mainly on mips and powerpc variants.
* define MAP_SYNC on powerpc/powerpc64Samuel Holland2020-03-141-1/+0
| | | | | | Linux defines MAP_SYNC on powerpc and powerpc64 as of commit 22fcea6f85f2 ("mm: move MAP_SYNC to asm-generic/mman-common.h"), so we can stop undefining it on those architectures.
* add clone3 syscall number from linux v5.3Szabolcs Nagy2019-12-301-0/+1
| | | | | | | | | | | | | | 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 Nagy2019-12-301-0/+1
| | | | | | | | | | see linux commit 7615d9e1780e26e0178c93c55b73309a5dc093d7 arch: wire-up pidfd_open() linux commit 32fcb426ec001cb6d5a4a195091a8486ea77e2df pid: add pidfd_open()
* move time_t and suseconds_t definitions to common alltypes.h.inRich Felker2019-11-021-3/+0
| | | | | | | now that all 32-bit archs have 64-bit time_t (and suseconds_t), the arch-provided _Int64 macro (long or long long, as appropriate) can be used to define them, and arch-specific definitions are no longer needed.
* move msghdr and cmsghdr out of bits/socket.hRich Felker2019-11-021-32/+0
| | | | | | | | | | | | | | | these structures can now be defined generically in terms of endianness and long size. previously, the 32-bit archs all shared a common definition from the generic bits header, and each 64-bit arch had to repeat the 64-bit version, with endian conditionals if the arch had variants of each endianness. I would prefer getting rid of the preprocessor conditionals for padding and instead using unnamed bitfield members, like commit 9b2921bea1d5017832e1b45d1fd64220047a9802 did for struct timespec. however, at present sendmsg, recvmsg, and recvmmsg need access to the padding members by name to zero them. this could perhaps be cleaned up in the future.
* use struct pt_regs * rather than void * for powerpc[64] sigcontext regsRich Felker2019-10-191-1/+1
| | | | | | | | this is to match the kernel and glibc interfaces. here, struct pt_regs is an incomplete type, but that's harmless, and if it's completed by inclusion of another header then members of the struct pointed to by the regs member can be accessed directly without going through a cast or intermediate pointer object.
* fix fpregset_t type on powerpc64Rich Felker2019-10-191-5/+1
| | | | | | | | | | the userspace ucontext API has this as an array rather than a structure. commit 3c59a868956636bc8adafb1b168d090897692532 fixed the corresponding mistake for vrregset_t, namely that the original powerpc64 port used a mix of types from 32-bit powerpc and powerpc64 rather than matching the 64-bit types.
* move pthread types out of per-arch alltypes.hRich Felker2019-10-171-8/+0
| | | | | | | | | | | policy has long been that these definitions are purely a function of whether long/pointer is 32- or 64-bit, and that they are not allowed to vary per-arch. move the definition to the shared alltypes.h.in fragment, using integer constant expressions in terms of sizeof to vary the array dimensions appropriately. I'm not sure whether this is more or less ugly than using preprocessor conditionals and two sets of definitions here, but either way is a lot less ugly than repeating the same thing for every arch.
* define LONG_MAX via arch alltypes.h, strip down bits/limits.hRich Felker2019-10-172-7/+2
| | | | | | | | | | | | | | | | | | | | | LLONG_MAX is uniform for all archs we support and plenty of header and code level logic assumes it is, so it does not make sense for limits.h bits mechanism to pretend it's variable. LONG_BIT can be defined in terms of LONG_MAX; there's no reason to put it in bits. by moving LONG_MAX definition to __LONG_MAX in alltypes.h and moving LLONG_MAX out of bits, there are now no plain-C limits that are defined in the bits header, so the bits header only needs to be included in the POSIX or extended profiles. this allows the feature test macro logic to be removed from the bits header, facilitating a long-term goal of getting such logic out of bits. having __LONG_MAX in alltypes.h will allow further generalization of headers. archs without a constant PAGESIZE no longer need bits/limits.h at all.
* remove use of endian.h from arch reloc.h headers, clean upRich Felker2019-10-171-2/+0
| | | | | | | | | | building on commit 97d35a552ec5b6ddf7923dd2f9a8eb973526acea, __BYTE_ORDER is now available wherever alltypes.h is included. since reloc.h is only used from src/internal/dynlink.h, it can be assumed that __BYTE_ORDER is exposed. reloc.h is not permitted to be included in other contexts, and generally, like most arch headers, lacks inclusion guards that would allow such usage. the mips64 version mistakenly included such guards; they are removed for consistency.
* remove indirect use of endian.h from public headersRich Felker2019-10-171-2/+0
| | | | | | | | building on commit 97d35a552ec5b6ddf7923dd2f9a8eb973526acea, __BYTE_ORDER is now available wherever alltypes.h is included. endian.h should not be used since, in the future, it will expose identifiers that are not in the reserved namespace for the headers which were previously using it.
* move __BYTE_ORDER definition to alltypes.hRich Felker2019-10-172-5/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | this change is motivated by the intersection of several factors. presently, despite being a nonstandard header, endian.h is exposing the unprefixed byte order macros and functions only if _BSD_SOURCE or _GNU_SOURCE is defined. this is to accommodate use of endian.h from other headers, including bits headers, which need to define structure layout in terms of endianness. with time64 switch-over, even more headers will need to do this. at the same time, the resolution of Austin Group issue 162 makes endian.h a standard header for POSIX-future, requiring that it expose the unprefixed macros and the functions even in standards-conforming profiles. changes to meet this new requirement would break existing internal usage of endian.h by causing it to violate namespace where it's used. instead, have the arch's alltypes.h define __BYTE_ORDER, either as a fixed constant or depending on the right arch-specific predefined macros for determining endianness. explicit literals 1234 and 4321 are used instead of __LITTLE_ENDIAN and __BIG_ENDIAN so that there's no danger of getting the wrong result if a macro is undefined and implicitly evaluates to 0 at the preprocessor level. the powerpc (32-bit) bits/endian.h being removed had logic for varying endianness, but our powerpc arch has never supported that and has always been big-endian-only. this logic is not carried over to the new __BYTE_ORDER definition in alltypes.h.
* remove per-arch definitions for va_listRich Felker2019-10-171-3/+0
| | | | | | | now that commit f7f1079796abc6f97c69521d2334e9c7d3945dd8 removed the legacy i386 conditional definition, va_list is in no way arch-specific, and has no reason to be in the future. move it to the shared part of alltypes.h.in
* add new syscall numbers from linux v5.2Szabolcs Nagy2019-09-111-0/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | new mount api syscalls were added, same numers on all targets, see linux commit a07b20004793d8926f78d63eb5980559f7813404 vfs: syscall: Add open_tree(2) to reference or clone a mount linux commit 2db154b3ea8e14b04fee23e3fdfd5e9d17fbc6ae vfs: syscall: Add move_mount(2) to move mounts around linux commit 24dcb3d90a1f67fe08c68a004af37df059d74005 vfs: syscall: Add fsopen() to prepare for superblock creation linux commit ecdab150fddb42fe6a739335257949220033b782 vfs: syscall: Add fsconfig() for configuring and managing a context linux commit 93766fbd2696c2c4453dd8e1070977e9cd4e6b6d vfs: syscall: Add fsmount() to create a mount for a superblock linux commit cf3cba4a429be43e5527a3f78859b1bfd9ebc5fb vfs: syscall: Add fspick() to select a superblock for reconfiguration linux commit 9c8ad7a2ff0bfe58f019ec0abc1fb965114dde7d uapi, x86: Fix the syscall numbering of the mount API syscalls [ver #2] linux commit d8076bdb56af5e5918376cd1573a6b0007fc1a89 uapi: Wire up the mount API syscalls on non-x86 arches [ver #2]
* fix clash between sys/user.h and kernel ptrace.h on powerpc[64], shRich Felker2019-08-191-6/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | due to historical accident/sloppiness in glibc, the powerpc, powerpc64, and sh versions of struct user, defined by sys/user.h, used struct pt_regs from the kernel asm/ptrace.h for their regs member. this made it impossible to define the type in an API-compatible manner without either including asm/ptrace.h like glibc does (contrary to our policy of not depending on kernel headers), or clashing with asm/ptrace.h's definition of struct pt_regs if both headers are included (which is almost always the case in software using sys/user.h). for a long time I viewed this problem as having no reasonable fix. I even explored the possibility of having the powerpc[64] and sh versions of user.h just include the kernel header (breaking with policy), but that looked like it might introduce new clashes with sys/ptrace.h. and it would also bring in a lot of additional cruft that makes no sense for sys/user.h to expose. glibc goes out of its way to suppress some of that with #undef, possibly leading to different problems. this is a rabbit-hole that should be explored no further. as it turns out, however, nothing actually uses struct user sufficiently to care about the type of the regs member; most software including sys/user.h does not even use struct user at all. so, the problem can be fixed just by doing away with the insistence on strict glibc API compatibility for the struct tag of the regs member. rather than renaming the tag, which might lead to the new name entering use as API, simply use an untagged structure inside struct user with the same members/layout as struct pt_regs. for sh, struct pt_dspregs is just removed entirely since it was not used.
* add support for powerpc/powerpc64 unaligned relocationsSamuel Holland2019-08-111-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | R_PPC_UADDR32 (R_PPC64_UADDR64) has the same meaning as R_PPC_ADDR32 (R_PPC64_ADDR64), except that its address need not be aligned. For powerpc64, BFD ld(1) will automatically convert between ADDR<->UADDR relocations when the address is/isn't at its native alignment. This will happen if, for example, there is a pointer in a packed struct. gold and lld do not currently generate R_PPC64_UADDR64, but pass through misaligned R_PPC64_ADDR64 relocations from object files, possibly relaxing them to misaligned R_PPC64_RELATIVE. In both cases (relaxed or not) this violates the PSABI, which defines the relevant field type as "a 64-bit field occupying 8 bytes, the alignment of which is 8 bytes unless otherwise specified." All three linkers violate the PSABI on 32-bit powerpc, where the only difference is that the field is 32 bits wide, aligned to 4 bytes. Currently musl fails to load executables linked by BFD ld containing R_PPC64_UADDR64, with the error "unsupported relocation type 43". This change provides compatibility with BFD ld on powerpc64, and any static linker on either architecture that starts following the PSABI more closely.
* get/setsockopt: add fallback for new time64 SO_RCVTIMEO/SO_SNDTIMEORich Felker2019-07-311-0/+3
| | | | | | | | | | without this, the SO_RCVTIMEO and SO_SNDTIMEO socket options would stop working on pre-5.1 kernels after time_t is switched to 64-bit and their values are changed to the new time64 versions. new code is written such that it's statically unreachable on 64-bit archs, and on existing 32-bit archs until the macro values are changed to activate 64-bit time_t.
* move IPC_64 from public bits/ipc.h to syscall_arch.hRich Felker2019-07-301-3/+0
| | | | | | | | | | | | | | | | | | | | the definition of the IPC_64 macro controls the interface between libc and the kernel through syscalls; it's not a public API. the meaning is rather obscure. long ago, Linux's sysvipc *id_ds structures used 16-bit uids/gids and wrong types for a few other fields. this was in the libc5 era, before glibc. the IPC_64 flag (64 is a misnomer; it's more like 32) tells the kernel to use the modern[-ish] versions of the structures. the definition of IPC_64 has nothing to do with whether the arch is 32- or 64-bit. rather, due to either historical accident or intentional obnoxiousness, the kernel only accepts and masks off the 0x100 IPC_64 flag conditional on CONFIG_ARCH_WANT_IPC_PARSE_VERSION, i.e. for archs that want to provide, or that accidentally provided, both. for archs which don't define this option, no masking is performed and commands with the 0x100 bit set will fail as invalid. so ultimately, the definition is just a matter of matching an arbitrary switch defined per-arch in the kernel.
* remove duplicates of new generic bits/msg.hRich Felker2019-07-291-12/+0
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* remove duplicates of new generic bits/sem.hRich Felker2019-07-291-13/+0
| | | | | | some of these were not exact duplicates, but had gratuitously different naming for padding, or omitted the endian checks because the arch is fixed-endian.
* remove trailing newlines from various versions of bits/shm.hRich Felker2019-07-291-1/+0
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* decouple struct stat from kernel typeRich Felker2019-07-181-0/+19
| | | | | | | | | | | | | | | presently, all archs/ABIs have struct stat matching the kernel stat[64] type, except mips/mipsn32/mips64 which do conversion hacks in syscall_arch.h to work around bugs in the kernel type. this patch completely decouples them and adds a translation step to the success path of fstatat. at present, this is just a gratuitous copying, but it opens up multiple possibilities for future support for 64-bit time_t on 32-bit archs and for cleaned-up/unified ABIs. for clarity, the mips hacks are not yet removed in this commit, so the mips kstat structs still correspond to the output of the hacks in their syscall_arch.h files, not the raw kernel type. a subsequent commit will fix this.
* fix conflicting mips and powerpc definitions for TIOCSER_TEMT macroSamuel Holland2019-07-101-1/+1
| | | | | | | | Commit 3517d74a5e04a377192d1f4882ad6c8dc22ce69a changed the token in sys/ioctl.h from 0x01 to 1, so bits/termios.h no longer matches. Revert the bits/termios.h change to keep the headers in sync. This reverts commit 9eda4dc69c33852c97c6f69176bf45ffc80b522f.
* add new syscall numbers from linux v5.1Szabolcs Nagy2019-07-011-0/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | syscall numbers are now synced up across targets (starting from 403 the numbers are the same on all targets other than an arch specific offset) IPC syscalls sem*, shm*, msg* got added where they were missing (except for semop: only semtimedop got added), the new semctl, shmctl, msgctl imply IPC_64, see linux commit 0d6040d4681735dfc47565de288525de405a5c99 arch: add split IPC system calls where needed new 64bit time_t syscall variants got added on 32bit targets, see linux commit 48166e6ea47d23984f0b481ca199250e1ce0730a y2038: add 64-bit time_t syscalls to all 32-bit architectures new async io syscalls got added, see linux commit 2b188cc1bb857a9d4701ae59aa7768b5124e262e Add io_uring IO interface linux commit edafccee56ff31678a091ddb7219aba9b28bc3cb io_uring: add support for pre-mapped user IO buffers a new syscall got added that uses the fd of /proc/<pid> as a stable handle for processes: allows sending signals without pid reuse issues, intended to eventually replace rt_sigqueueinfo, kill, tgkill and rt_tgsigqueueinfo, see linux commit 3eb39f47934f9d5a3027fe00d906a45fe3a15fad signal: add pidfd_send_signal() syscall on some targets (arm, m68k, s390x, sh) some previously missing syscall numbers got added as well.
* make powerpc64 vrregset_t logical layout match expected APIRich Felker2019-05-221-1/+4
| | | | | | | | | between v2 and v3 of the powerpc64 port patch, the change was made from a 32x4 array of 32-bit unsigned ints for vrregs[] to a 32-element array of __int128. this mismatches the API applications working with mcontext_t expect from glibc, and seems to have been motivated by a misinterpretation of a comment on how aarch64 did things as a suggestion to do the same on powerpc64.
* fix vrregset_t layout and member naming on powerpc64Rich Felker2019-05-221-4/+8
| | | | | | | | | | | | | | | | | | the mistaken layout seems to have been adapted from 32-bit powerpc, where vscr and vrsave are packed into the same 128-bit slot in a way that looks like it relies on non-overlapping-ness of the value bits in big endian. the powerpc64 port accounted for the fact that the 64-bit ABI puts each in its own 128-bit slot, but ordered them incorrectly (matching the bit order used on the 32-bit ABI), and failed to account for vscr being padded according to endianness so that it can be accessed via vector moves. in addition to ABI layout, our definition used different logical member layout/naming from glibc, where vscr is a structure to facilitate access as a 32-bit word or a 128-bit vector. the inconsistency here was unintentional, so fix it.
* powerpc: add PTRACE_SYSEMU from linux v4.20Szabolcs Nagy2019-03-131-0/+2
| | | | added in linux commit 5521eb4bca2db733952f068c37bdf3cd656ad23c
* move arch-invariant definitions out of bits/ioctl.hBobby Bingham2019-02-071-97/+0
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* add io_pgetevents and rseq syscall numbers from linux v4.18Szabolcs Nagy2018-12-091-0/+2
| | | | | | | | io_pgetevents is new in linux commit 7a074e96dee62586c935c80cecd931431bfdd0be rseq is new in linux commit d7822b1e24f2df5df98c76f0e94a5416349ff759
* make thread-pointer-loading asm non-volatileRich Felker2018-10-161-1/+1
| | | | | | | | | | this will allow the compiler to cache and reuse the result, meaning we no longer have to take care not to load it more than once for the sake of archs where the load may be expensive. depends on commit 1c84c99913bf1cd47b866ed31e665848a0da84a2 for correctness, since otherwise the compiler could hoist loads during stage 3 of dynamic linking before the initial thread-pointer setup.
* fix broken atomic store on powerpc[64]Rich Felker2018-09-141-8/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | in our memory model, all atomics are supposed to be full barriers; stores are not release-only. this is important because store is used as an unlock operation in places where it needs to acquire the waiter count to determine if a futex wake is needed. at least in the malloc-internal locks, but possibly elsewhere, soft deadlocks from missing futex wake (breakable by poking the threads to restart the syscall, e.g. by attaching a tracer) were reported to occur. once the malloc lock is replaced with Jens Gustedt's new lock implementation (see commit 47d0bcd4762f223364e5b58d5a381aaa0cbd7c38), malloc will not be affected by the issue, but it's not clear that other uses won't be. reducing the strength of the ordering properties required from a_store would require a thorough analysis of how it's used. to fix the problem, I'm removing the powerpc[64]-specific a_store definition; now, the top-level atomic.h will implement a_store using a_barrier on both sides of the store. it's not clear to me yet whether there might be issues with the other atomics. it's possible that a_post_llsc needs to be replaced with a full barrier to guarantee the formal semanics we want, but either way I think the difference is unlikely to impact the way we use them.
* add support for arch-specific ptrace command macrosSzabolcs Nagy2018-07-171-0/+23
| | | | | | | | | | | | | | | | | | | | | | | | sys/ptrace.h is target specific, use bits/ptrace.h to add target specific macro definitions. these macros are kept in the generic sys/ptrace.h even though some targets don't support them: PTRACE_GETREGS PTRACE_SETREGS PTRACE_GETFPREGS PTRACE_SETFPREGS PTRACE_GETFPXREGS PTRACE_SETFPXREGS so no macro definition got removed in this patch on any target. only s390x has a numerically conflicting macro definition (PTRACE_SINGLEBLOCK). the PT_ aliases follow glibc headers, otherwise the definitions come from linux uapi headers except ones that are skipped in glibc and there is no real kernel support (s390x PTRACE_*_AREA) or need special type definitions (mips PTRACE_*_WATCH_*) or only relevant for linux 2.4 compatibility (PTRACE_OLDSETOPTIONS).
* fix regression in powerpc[64] SO_PEERSEC definitionRich Felker2018-06-261-0/+1
| | | | | | | commit 587f5a53bc3a68d80b239ba515d583df690a96df moved the definition of SO_PEERSEC to bits/socket.h for archs where the SO_* macros differ from their standard values, but failed to add copies of the generic definition for powerpc and powerpc64.
* powerpc: add pkey syscall numbers from linux v4.16Szabolcs Nagy2018-06-191-0/+3
| | | | | | add pkey_mprotect, pkey_alloc, pkey_free syscall numbers, new in linux commits 3350eb2ea127978319ced883523d828046af4045 and 9499ec1b5e82321829e1c1510bcc37edc20b6f38
* fix TLS layout of TLS variant I when there is a gap above TPSzabolcs Nagy2018-06-021-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | In TLS variant I the TLS is above TP (or above a fixed offset from TP) but on some targets there is a reserved gap above TP before TLS starts. This matters for the local-exec tls access model when the offsets of TLS variables from the TP are hard coded by the linker into the executable, so the libc must compute these offsets the same way as the linker. The tls offset of the main module has to be alignup(GAP_ABOVE_TP, main_tls_align). If there is no TLS in the main module then the gap can be ignored since musl does not use it and the tls access models of shared libraries are not affected. The previous setup only worked if (tls_align & -GAP_ABOVE_TP) == 0 (i.e. TLS did not require large alignment) because the gap was treated as a fixed offset from TP. Now the TP points at the end of the pthread struct (which is aligned) and there is a gap above it (which may also need alignment). The fix required changing TP_ADJ and __pthread_self on affected targets (aarch64, arm and sh) and in the tlsdesc asm the offset to access the dtv changed too.
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