the bits file is retained, but as a single generic version, to allow
for the unlikely future possibility of letting a new arch define
something differently.
this change is purely to document that they are the same in
preparation to remove the arch-specific headers for these archs and
replace them with a generic version that matches riscv32 and can be
shared by these and all future archs.
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
see
linux commit cf264e1329fb0307e044f7675849f9f38b44c11a
cachestat: implement cachestat syscall
linux commit 946e697c69ffeeefdd84dad90eac307284df46be
cachestat: wire up cachestat for other architectures
see
linux commit c6018b4b254971863bd0ad36bb5e7d0fa0f0ddb0
mm/mempolicy: add set_mempolicy_home_node syscall
linux commit 21b084fdf2a49ca1634e8e360e9ab6f9ff0dee11
mm/mempolicy: wire up syscall set_mempolicy_home_node
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
see
linux commit 884a7e5964e06ed93c7771c0d7cf19c09a8946f1
mm: introduce process_mrelease system call
linux commit dce49103962840dd61423d7627748d6c558d58c5
mm: wire up syscall process_mrelease
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.
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()
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.
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
see
linux commit 9b4feb630e8e9801603f3cab3a36369e3c1cf88d
arch: wire-up close_range()
linux commit 278a5fbaed89dacd04e9d052f4594ffd0e0585de
open: add close_range()
the ABI type for the vector registers in fpregset_t, struct
fpsimd_context, and struct user_fpsimd_struct is __uint128_t, which
was presumably originally not used because it's a nonstandard type,
but its existence is mandated by the aarch64 psABI. use of the wrong
type here broke software using these structures, and encouraged
incorrect fixes with casts rather than reinterpretation of
representation.
the linux faccessat syscall lacks a flag argument that is necessary
to implement the posix api, see
linux commit c8ffd8bcdd28296a198f237cc595148a8d4adfbe
vfs: add faccessat2 syscall
added in
linux commit 1a50ec0b3b2e9a83f1b1245ea37a853aac2f741c
arm64: Implement archrandom.h for ARMv8.5-RNG
linux commit d4209d8b717311d114b5d47ba7f8249fd44e97c2
arm64: cpufeature: Export matrix and other features to userspace
these were missed before, added in
linux commit 1201937491822b61641c1878ebcd16a93aed4540
arm64: Expose ARMv8.5 CondM capability to userspace
linux commit ca9503fc9e9812aa6258e55d44edb03eb30fc46f
arm64: Expose FRINT capabilities to userspace
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
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).
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
see
linux commit 7615d9e1780e26e0178c93c55b73309a5dc093d7
arch: wire-up pidfd_open()
linux commit 32fcb426ec001cb6d5a4a195091a8486ea77e2df
pid: add pidfd_open()
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.
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
9b2921bea1 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.
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.
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.
building on commit 97d35a552e,
__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.
building on commit 97d35a552e,
__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.
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.
now that commit f7f1079796 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
AT_HWCAP2 flags, see
linux commit 671db581815faf17cbedd7fcbc48823a247d90b1
arm64: Expose DC CVADP to userspace
linux commit 06a916feca2b262ab0c1a2aeb68882f4b1108a07
arm64: Expose SVE2 features for userspace
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]
these differ from generic only in using endian-matched padding with a
short __ipc_perm_seq field in place of the int field in generic. this
is not a documented public interface anyway, and the original intent
was to use int here. some ports just inadvertently slipped in the
kernel short+padding form.
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.
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.
various padding fields in the generic bits/sem.h were defined in terms
of time_t as a cheap hack standing in for "kernel long", to allow x32
to use the generic version of the file. this was a really bad idea, as
it ended up getting copied into lots of arch-specific versions of the
bits file, and is a blocker to changing time_t to 64-bit on 32-bit
archs.
this commit adds an x32-specific version of the header, and changes
padding type back from time_t to long (currently the same type on all
archs but x32) in the generic header and all the others the hack got
copied into.
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.
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.
C99 has ways to support fenv access, but compilers don't implement it
and assume nearest rounding mode and no fp status flag access. (gcc has
-frounding-math and then it does not assume nearest rounding mode, but
it still assumes the compiled code itself does not change the mode.
Even if the C99 mechanism was implemented it is not ideal: it requires
all code in the library to be compiled with FENV_ACCESS "on" to make it
usable in non-nearest rounding mode, but that limits optimizations more
than necessary.)
The math functions should give reasonable results in all rounding modes
(but the quality may be degraded in non-nearest rounding modes) and the
fp status flag settings should follow the spec, so fenv side-effects are
important and code transformations that break them should be prevented.
Unfortunately compilers don't give any help with this, the best we can
do is to add fp barriers to the code using volatile local variables
(they create a stack frame and undesirable memory accesses to it) or
inline asm (gcc specific, requires target specific fp reg constraints,
often creates unnecessary reg moves and multiple barriers are needed to
express that an operation has side-effects) or extern call (only useful
in tail-call position to avoid stack-frame creation and does not work
with lto).
We assume that in a math function if an operation depends on the input
and the output depends on it, then the operation will be evaluated at
runtime when the function is called, producing all the expected fenv
side-effects (this is not true in case of lto and in case the operation
is evaluated with excess precision that is not rounded away). So fp
barriers are needed (1) to prevent the move of an operation within a
function (in case it may be moved from an unevaluated code path into an
evaluated one or if it may be moved across a fenv access), (2) force the
evaluation of an operation for its side-effect when it has no input
dependency (may be constant folded) or (3) when its output is unused. I
belive that fp_barrier and fp_force_eval can take care of these and they
should not be needed in hot code paths.
HWCAP_SB - speculation barrier instruction available added in linux
commit bd4fb6d270bc423a9a4098108784f7f9254c4e6d
HWCAP_PACA, HWCAP_PACG - pointer authentication instructions available
(address and generic) added in linux commit
7503197562567b57ec14feb3a9d5400ebc56812f
