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2021-09-23add qsort_r and make qsort a wrapper around itHEADmasterÉrico Nogueira-17/+36
we make qsort a wrapper by providing a wrapper_cmp function that uses the extra argument as a function pointer. should be optimized to a tail call on most architectures, as long as it's built with -fomit-frame-pointer, so the performance impact should be minimal. to keep the git history clean, for now qsort_r is implemented in qsort.c and qsort is implemented in qsort_nr.c. qsort.c also received a few trivial cleanups, including replacing (*cmp)() calls with cmp(). qsort_nr.c contains only wrapper_cmp and qsort as a qsort_r wrapper itself.
2021-09-23add SPE FPU support to powerpc-sfRich Felker-13/+71
When the soft-float ABI for PowerPC was added in commit 5a92dd95c77cee81755f1a441ae0b71e3ae2bcdb, with Freescale cpus using the alternative SPE FPU as the main use case, it was noted that we could probably support hard float on them, but that it would involve determining some difficult ABI constraints. This commit is the completion of that work. The Power-Arch-32 ABI supplement defines the ABI profiles, and indeed ATR-SPE is built on ATR-SOFT-FLOAT. But setjmp/longjmp compatibility are problematic for the same reason they're problematic on ARM, where optional float-related parts of the register file are "call-saved if present". This requires testing __hwcap, which is now done. In keeping with the existing powerpc-sf subarch definition, which did not have fenv, the fenv macros are not defined for SPE and the SPEFSCR control register is left (and assumed to start in) the default mode.
2021-09-11fix undefined behavior in getdelim via null pointer arithmetic and memcpyRich Felker-3/+5
both passing a null pointer to memcpy with length 0, and adding 0 to a null pointer, are undefined. in some sense this is 'benign' UB, but having it precludes use of tooling that strictly traps on UB. there may be better ways to fix it, but conditioning the operations which are intended to be no-ops in the k==0 case on k being nonzero is a simple and safe solution.
2021-08-12fix excessively slow TLS performance on some mips modelsRich Felker-2/+1
commit 6d99ad91e869aab35a4d76d34c3c9eaf29482bad introduced this regression as part of a larger change, based on an incorrect assumption that rdhwr being part of the mips r2 ISA level meant that the TLS register, known in the mips documentation as UserLocal, was unconditionally present on chips providing this ISA level and would not need trap-and-emulate. this turns out to be false. based on research by Stanislav Kljuhhin and Abilio Marques, who reported the problem as a performance regression on certain routers using OpenWRT vs older uclibc-based versions, it turns out the mips manuals document the UserLocal register as a feature that might or might not be implemented or enabled, reflected by a cpu capability bit in the CONFIG3 register, and that Linux checks for this and has to explicitly enable it on models that have it. thus, it's indeed possible that r2+ chips can lack the feature, bringing us back to the situation where Linux only has a fast trap-and-emulate path for the case where the destination register is $3. so, always read the thread pointer through $3. this may incur a gratuitous move to the desired final register on chips where it's not needed, but it really doesn't matter.
2021-08-06fix error checking in pthread_getname_npÉrico Nogueira-1/+1
len is unsigned and can never be smaller than 0. though unlikely, an error in read() would have lead to an out of bounds write to name. Reported-by: Michael Forney <mforney@mforney.org>
2021-07-29fix libc-internal signal blocking on mips archsRich Felker-2/+2
due to historical reasons, the mips signal set has 128 bits rather than 64 like on every other arch. this was special-cased correctly, at least for 32-bit mips, at one time, but was inadvertently broken in commit 7c440977db9444d7e6b1c3dcb1fdf4ee49ca4158, and seems never to have been right on mips64/n32. as consequenct of this bug, applications making use of high realtime signal numbers on mips may have been able to execute application code in contexts where doing so was unsafe.
2021-07-06fix broken struct shmid_ds on powerpc (32-bit)Rich Felker-1/+1
the kernel structure has padding of the shm_segsz member up to 64 bits, as well as 2 unused longs at the end. somehow that was overlooked when the powerpc port was added, and it has been broken ever since; applications compiled with the wrong definition do not correctly see the shm_segsz, shm_cpid, and shm_lpid members. fixing the definition just by adding the missing padding would break the ABI size of the structure as well as the position of the time64 shm_atime and shm_dtime members we added at the end. instead, just move one of the unused padding members from the original end (before time64) of the structure to the position of the missing padding. this preserves size and preserves correct behavior of any compiled code that was already working. programs affected by the wrong definition need to be recompiled with the correct one.
2021-07-06math: fix fmaf not to depend on FE_TOWARDZEROSzabolcs Nagy-11/+10
2021-06-23fix TZ parsing logic for identifying POSIX-form stringsRich Felker-1/+13
previously, the contents of the TZ variable were considered a candidate for a file/path name only if they began with a colon or contained a slash before any comma. the latter was very sloppy logic to avoid treating any valid POSIX TZ string as a file name, but it also triggered on values that are not valid POSIX TZ strings, including 3-letter timezone names without any offset. instead, only treat the TZ variable as POSIX form if it begins with a nonzero standard time name followed by +, -, or a digit. also, special case GMT and UTC to always be treated as POSIX form (with implicit zero offset) so that a stray file by the same name cannot break software that depends on setting TZ=GMT or TZ=UTC.
2021-06-05riscv: rename __NR_fstatat __NR_newfstatatKhem Raj-1/+1
on riscv64 this syscall is called __NR_newfstatat this helps the name match kernel UAPI for external programs
2021-04-27remove return with expression in void functionMichael Forney-1/+1
2021-04-20remove unnecessary cast for map_library returnÉrico Nogueira-1/+1
the function already returns (void *)
2021-04-20add pthread_getname_np functionÉrico Rolim-0/+26
based on the pthread_setname_np implementation
2021-04-20fix popen not to leak pipes from one child to anotherRich Felker-0/+6
POSIX places an obscure requirement on popen which is like a limited version of close-on-exec: "The popen() function shall ensure that any streams from previous popen() calls that remain open in the parent process are closed in the new child process." if the POSIX-future 'e' mode flag is passed, producing a pipe FILE with FD_CLOEXEC on the underlying pipe, this requirement is automatically satisfied. however, for applications which use multiple concurrent popen pipes but don't request close-on-exec, fd leaks from earlier popen calls to later ones could produce deadlock situations where processes are waiting for a pipe EOF that will never happen. to fix this, iterate through all open FILEs and add close actions for those obtained from popen. this requires holding a lock on the open file list across the posix_spawn call so that additional popen FILEs are not created after the list is traversed. note that it's still possible for another popen call to start and create its pipe while the lock is held, but such pipes are created with O_CLOEXEC and only drop close-on-exec status (when 'e' flag is omitted) under control of the lock.
2021-04-20remove spurious lock in popenRich Felker-2/+0
the newly allocated FILE * has not yet leaked to the application and is only visible to stdio internals until popen returns. since we do not change any fields of the structure observed by libc internals, only the pipe_pid member, locking is not necessary.
2021-04-19define __STDC_UTF_{16,32}__ macrosÉrico Nogueira-0/+3
these macros are used to indicate that the implementation uses, respectively, utf-16 and utf-32 encoding for char16_t and char32_t.
2021-04-16fix regression in dl_iterate_phdr reporting of modules with no TLSRich Felker-1/+2
__tls_get_addr should not be called with an invalid TLS module id of 0. in practice it probably "works", returning the DTV length as if it were a pointer, and the callback should probably not inspect dlpi_tls_data in this case, but it's likely that some real-world callbacks use a check on dlpi_tls_data being non-null, rather than on dlpi_tls_modid being nonzero, to conclude that the module has TLS.
2021-04-16nscd: fall back gracefully on kernels without AF_UNIX supportJoakim Sindholt-1/+9
2021-04-16mallocng/aligned_alloc: check for malloc failureDominic Chen-0/+3
With mallocng, calling posix_memalign() or aligned_alloc() will SIGSEGV if the internal malloc() call returns NULL. This does not occur with oldmalloc, which explicitly checks for allocation failure.
2021-04-03make epoll_[p]wait a cancellation pointRich Felker-2/+2
this is a Linux-specific function and not covered by POSIX's requirements for which interfaces are cancellation points, but glibc makes it one and existing software relies on it being one. at some point a review for similar functions that should be made cancellation points should be done.
2021-03-26fix dl_iterate_phdr dlpi_tls_data reporting to match specRich Felker-2/+3
dl_iterate_phdr was wrongly reporting the address of the DSO's PT_TLS image rather than the calling thread's instance of the TLS. the man page, which is essentially normative for a nonstandard function of this sort, clearly specifies the latter. it does not clarify where exactly within/relative-to the image the pointer should point, but the reasonable thing to do is match the ABI's DTP offset, and this seems to be what other implementations do.
2021-03-15remove no-longer-needed special case handling in popenRich Felker-16/+0
popen was special-casing the possibility (only possible when the parent closed stdin and/or stdout) that the child's end of the pipe was already on the final desired fd number, in which case there was no way to get rid of its close-on-exec flag in the child. commit 6fc6ca1a323bc0b6b9e9cdc8fa72221ae18fe206 made this unnecessary by implementing the POSIX-future requirement that dup2 file actions with equal source and destination fd values remove the close-on-exec flag.
2021-03-15use internal malloc for posix_spawn file actions objectsRich Felker-0/+5
this makes it possible to perform actions on file actions objects with a libc-internal lock held without creating lock order relationships that are silently imposed on an application-provided malloc.
2021-03-05don't fail to map library/executable with zero-length segment mapsRich Felker-0/+1
reportedly the GNU linker can emit such segments, causing spurious failure to load due to mmap with a length of zero producing EINVAL. no action is required for such a load map (it's effectively a nop in the program headers table) so just treat it as always successful.
2021-02-25suppress isascii() macro for C++Érico Rolim-0/+2
analogous to commit a60457c84a4b59ab564d7f4abb660a70283ba98d.
2021-02-22guard against compilers failing to handle setjmp specially by defaultRich Felker-3/+11
since 4.1, gcc has had the __returns_twice__ attribute and has required functions which return twice to carry it; however it's always applied it automatically to known setjmp-like function names. clang however does not do this reliably, at least not with -ffreestanding and possibly under other conditions, resulting in silent emission of wrong code. since the symbol name setjmp is in no way special (setjmp is specified as a macro that could expand to use any implementation-specific symbol name or names), a compiler is justified not to do anything special without further hints, and it's reasonable to do what we can to provide such hints. gcc 4.0.x and earlier do not recognize the attribute, so make use conditional on __GNUC__ macros. clang and other gcc-like compilers report (and have always reported) a later "GNUC" version so the preprocessor conditional should function as desired for them as too. undefine the internal macro after use so that nothing abuses it as a public feature.
2021-02-15aarch64/bits/mman.h: add PROT_MTE from linux v5.10Szabolcs Nagy-0/+1
see linux commit 9f3419315f3cdc41a7318e4d50ba18a592b30c8c arm64: mte: Add PROT_MTE support to mmap() and mprotect()
2021-02-15aarch64/bits/hwcap.h: add HWCAP2_MTE from linux v5.10Szabolcs Nagy-0/+1
see linux commit 3b714d24ef173f81c78af16f73dcc9b40428c803 arm64: mte: CPU feature detection and initial sysreg configuration
2021-02-15add aarch64/bits/mman.h with PROT_BTI from linux v5.8Szabolcs Nagy-0/+1
this was missing, see linux commit 8ef8f360cf30be12382f89ff48a57fbbd9b31c14 arm64: Basic Branch Target Identification support
2021-02-15aarch64/bits/hwcap.h: add HWCAP2_BTI from linux v5.8Szabolcs Nagy-0/+1
hwcap for BTI was missing, see linux commit 8ef8f360cf30be12382f89ff48a57fbbd9b31c14 arm64: Basic Branch Target Identification support
2021-02-15signal.h: add MTE specific SIGSEGV codes from linux v5.10Szabolcs Nagy-0/+2
add synchronouse and asynchronous tag check failure codes, see linux commit 74f1082487feb90bbf880af14beb8e29c3030c9f arm64: mte: Add specific SIGSEGV codes
2021-02-15sys/prctl.h: add MTE related constants from linux v5.10Szabolcs Nagy-0/+7
these are for the aarch64 MTE (memory tagging extension), see linux commit 1c101da8b971a36695319dce7a24711dc567a0dd arm64: mte: Allow user control of the tag check mode via prctl() linux commit af5ce95282dc99d08a27a407a02c763dde1c5558 arm64: mte: Allow user control of the generated random tags via prctl()
2021-02-15elf.h: add NT_ARM_TAGGED_ADDR_CTRL from linux v5.10Szabolcs Nagy-0/+1
see linux commit 2200aa7154cb7ef76bac93e98326883ba64bfa2e arm64: mte: ptrace: Add NT_ARM_TAGGED_ADDR_CTRL regset
2021-02-15sys/mman.h: add MAP_HUGE_16KB from linux v5.10Szabolcs Nagy-0/+1
see linux commit e47168f3d1b14af5281cf50c59561d59d28201f9 powerpc/8xx: Support 16k hugepages with 4k pages
2021-02-15sys/mount.h: add MS_NOSYMFOLLOW from linux v5.10Szabolcs Nagy-0/+1
path resolution does not follow symlinks on nosymfollow mounts (but readlink still does), see linux commit dab741e0e02bd3c4f5e2e97be74b39df2523fc6e Add a "nosymfollow" mount option.
2021-02-15sys/membarrier.h: add new constants from linux v5.10Szabolcs Nagy-0/+4
can cause rseq restart on another cpu to synchronize with global memory access from rseq critical sections, see linux commit 2a36ab717e8fe678d98f81c14a0b124712719840 rseq/membarrier: Add MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ
2021-02-15bits/syscall.h: add process_madvise from linux v5.10Szabolcs Nagy-0/+16
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
2021-02-13fix error return value for cuseridRich Felker-2/+3
the historical function was specified to return an empty string in the caller-provided buffer, not a null pointer, to indicate error when the argument is non-null. only when the argument is null should it return a null pointer on error.
2021-02-13fix misuse of getpwuid_r in cuseridRich Felker-1/+2
getpwuid_r can return 0 but without a result in the case where there was no error but no record exists. in that case cuserid was treating it as success and copying junk out of pw.pw_name to the output buffer.
2021-02-13cuserid: don't return truncated resultsRich Felker-1/+5
checking the length also drops the need to pull in snprintf.
2021-02-13cuserid: support invocation with a null pointer argumentSören Tempel-0/+2
this function was removed from the standard in 2001 but appeared in SUSv2 with an obligation to support calls with a null pointer argument, using a static buffer.
2021-02-12riscv64: define ELF_NFPREGKhem Raj-0/+1
ELF_NFPREG is used by some userspace applications like gdb
2021-02-10math: fix expm1f overflow thresholdSzabolcs Nagy-2/+1
the threshold was wrong so expm1f overflowed to inf a bit too early and on most targets uint32_t compare is faster than float compare so use that. this also fixes sinhf incorrectly returning nan for some values where the internal expm1f overflowed.
2021-02-10math: fix acoshf for negative inputsSzabolcs Nagy-4/+4
on some negative inputs (e.g. -0x1.1e6ae8p+5) acoshf failed to return nan. ensure that negative inputs result nan without introducing new branches. this was tried before in commit 101e6012856918440b5d7474739c3fc22a8d3b85 math: fix acoshf on negative values but that fix was wrong. there are 3 formulas used: log1p(x-1 + sqrt((x-1)*(x-1)+2*(x-1))) log(2*x - 1/(x+sqrt(x*x-1))) log(x) + 0.693147180559945309417232121458176568 the first fails on large negative inputs (may compute log1p(0) or log1p(inf)), the second one fails on some mid range or large negative inputs (may compute log(large) or log(inf)) and the last one fails on -0 (returns -inf).
2021-01-30fix possible fd leak via missing O_CLOEXEC in pthread_setname_npÉrico Rolim-1/+1
the omission of the flag here seems to have been an oversight when the function was added in 8fb28b0b3e7a5e958fb844722a4b2ef9bc244af1
2021-01-30oldmalloc: preserve errno across freeRich Felker-0/+4
as an outcome of Austin Group issue #385, future versions of the standard will require free not to alter the value of errno. save and restore it individually around the calls to madvise and munmap so that the cost is not imposed on calls to free that do not result in any syscall.
2021-01-30fix build regression in oldmallocRich Felker-1/+1
commit 8d37958d58cf36f53d5fcc7a8aa6d633da6071b2 inadvertently broke oldmalloc by having it implement __libc_malloc rather than __libc_malloc_impl.
2021-01-30preserve errno across freeRich Felker-2/+10
as an outcome of Austin Group issue #385, future versions of the standard will require free not to alter the value of errno. save and restore it individually around the calls to madvise and munmap so that the cost is not imposed on calls to free that do not result in any syscall.
2021-01-30fix inconsistent signature of __libc_start_mainRich Felker-1/+2
commit 7586360badcae6e73f04eb1b8189ce630281c4b2 removed the unused arguments from the definition of __libc_start_main, making it incompatible with the declaration at the point of call, which still passed 6 arguments. calls with mismatched function type have undefined behavior, breaking LTO and any other tooling that checks for function signature mismatch. removing the extra arguments from the point of call (crt1) is not an option for fixing this, since that would be a change in ABI surface between application and libc. adding back the extra arguments requires some care. on archs that pass arguments on the stack or that reserve argument spill space for the callee on the stack, it imposes an ABI requirement on the caller to provide such space. the modern crt1.c entry point provides such space, but originally there was arch-specific asm for the call to __libc_start_main. the last of this asm was removed in commit 6fef8cafbd0f6f185897bc87feb1ff66e2e204e1, and manual review of the code removed and its prior history was performed to check that all archs/variants passed the legacy init/fini/ldso_fini arguments.
2021-01-30fail posix_spawn file_actions operations with negative fdsRich Felker-0/+4
these functions are specified to fail with EBADF on negative fd arguments. apart from close, they are also specified to fail if the value exceeds OPEN_MAX, but as written it is not clear that this imposes any requirement when OPEN_MAX is not defined, and it's undesirable to impose a dynamic limit (via setrlimit) here since the limit at the time of posix_spawn may be different from the limit at the time of setting up the file actions. this may require revisiting later.