AgeCommit message (Collapse)AuthorLines
2014-05-20release 1.1.1v1.1.1Rich Felker-1/+27
2014-05-20trivial formatting fix for the config.mak generated by configureRich Felker-1/+1
2014-05-19fix unhandled cases in strptimeRich Felker-5/+16
%C, %U, %W, and %y handling were completely missing; %C wrongly fell-through to unrelated cases, and the rest returned failure. for now, they all parse numbers in the proper forms and range-check the values, but they do not store the value anywhere. it's not clear to me whether, as "derived" fields, %U and %W should produce any result. they certainly cannot produce a result unless the year and weekday are also converted, but in this case it might be desirable for them to do so. clarification is needed on the intended behavior of strptime in cases like this. %C and %y have well-defined behavior as long as they are used together (and %y is defined by itself but may change in the future). implementing them (including their correct interaction) is left as a later change to be made. finally, strptime now rejects unknown/invalid format characters instead of ignoring them.
2014-05-19remove unsupported nonstandard sysconf macros and their table entriesRich Felker-120/+0
some of these may have been from ancient (pre-SUSv2) POSIX versions; more likely, they were from POSIX drafts or glibc interpretations of what ancient versions of POSIX should have added (instead they made they described functionality mandatory and/or dropped it completely). others are purely glibc-isms, many of them ill-thought-out, like providing ways to lookup the min/max values of types at runtime (despite the impossibility of them changing at runtime and the impossibility of representing ULONG_MAX in a return value of type long). since our sysconf implementation does not support or return meaningful values for any of these, it's harmful to have the macros around; applications' build scripts may detect and attempt to use them, only to get -1/EINVAL as a result. if removing them does break some applications, and it's determined that the usage was reasonable, some of these could be added back on an as-needed basis, but they should return actual meaningful values, not junk like they were returning before.
2014-05-19rework sysconf table to treat zero entries as invalidRich Felker-10/+13
based on patch by Timo Teräs. previously, the value zero was used as a literal zero, meaning that all invalid sysconf "names", which should result in sysconf returning -1, had to be explicitly listed. (in addition, it was not possible for sysconf to set errno to EINVAL, as there was no distinction between -1 as an error and -1 as a valid result.) now, the value 0 is used for invalid/undefined slots in the table and a new switch table entry is used for returning literal zeros. in addition, an off-by-one error in checking against the table size is fixed.
2014-05-19add configure check for broken gcc 4.9.0 and possibly other versionsRich Felker-5/+37
this is gcc bug #61144. the broken compiler is detected, but the user must manually work around it. this is partly to avoid complex logic for adding workaround CFLAGS and attempting to recheck with them, and partly for the sake of letting the user know the compiler is broken (since the workaround will result in less-efficient code production). some refactoring was also needed to move the check for gcc outside of the check for whether to build the compiler wrapper.
2014-05-13add cp437 and cp850 to available iconv conversionsRich Felker-177/+206
perhaps some additional legacy DOS-era codepages would also be useful to have, but these are the ones for which there has been demand. the size of the diff is due to the fact that legacychars.h is updated in such a way that new characters are inserted into the table in unicode codepoint order; thus other mappings in codepages.h have changed to reflect the new table indices of their characters.
2014-05-12add configure check for working compilerRich Felker-0/+9
without this, broken choices of CC/CPPFLAGS/CFLAGS don't show up until late in the configure process where they are confusingly reported as a different failure such as incorrect long double type.
2014-05-08fix strftime %s not to zero pad with default width=2Szabolcs Nagy-0/+1
2014-05-04remove useless __yield alias for sched_yieldRich Felker-4/+1
this is no longer used for anything, and reportedly clashed with a builtin on certain compilers.
2014-04-30fix arm thread-pointer/atomic asm when compiling to thumb codeRich Felker-6/+7
armv7/thumb2 provides a way to do atomics in thumb mode, but for armv6 we need a call to arm mode. this commit is based on a patch by Stephen Thomas which fixed the armv7 cases but not the armv6 ones. all of this should be revisited if/when runtime selection of thread pointer access and atomics are added.
2014-04-30fix missing SO_RCVBUFFORCE and SO_SNDBUFFORCE in mips socket.hRich Felker-1/+2
2014-04-27fix superh nofpu check on old gcc versionsBobby Bingham-1/+1
As far as gcc3 knows, sh4 is the only processor version that can have an FPU, so it indicates the FPU's presence by defining __SH4__. This is not defined if there is no FPU, even if the processor really is an SH4. Starting with gcc4, there is support for the sh2a processor, which has an FPU but is not an SH4. gcc4 therefore additionally defines __SH_FPU_ANY__ when there is an FPU, but still doesn't define __SH4__ for an FPU-less sh4. Therefore, to support all gcc versions, we must look at both preprocessor symbols.
2014-04-22perform minimal sanity checks on zoneinfo files loaded via TZ variableRich Felker-0/+5
previously, setting TZ to the pathname of a file which was not a valid zoneinfo file would usually cause programs using local time zone based operations to crash. the new code checks the file size and magic at the beginning of the file, which seems sufficient to prevent accidental misconfiguration from causing crashes. attempting to make fully-robust validation would be futile unless we wanted to drop use of mmap (shared zoneinfo) and instead read it into a local buffer, since such validation would be subject to race conditions with modification of the file.
2014-04-22do not try to interpret implementation specific strings as tz definitionTimo Teräs-0/+1
2014-04-21make __init_libc static for non-shared libcRich Felker-0/+3
being static allows it to be inlined in __libc_start_main; inlining should take place at all levels since the function is called exactly once. this further reduces mandatory startup code size for static binaries.
2014-04-21further micro-optimize startup code for sizeRich Felker-23/+14
there is no reason (and seemingly there never was any) for __init_security to be its own function. it's linked unconditionally so it can just be placed inline in __init_libc.
2014-04-21micro-optimize some startup code for sizeRich Felker-7/+4
moving the call to __init_ssp from __init_security to __init_libc makes __init_security a leaf function, which allows the compiler to make it smaller. __init_libc is already non-leaf, and the additional call makes no difference to the amount of register spillage. in addition, it really made no sense for the call to __init_ssp to be buried inside __init_security rather than parallel with other init functions.
2014-04-21allow zoneinfo-path-relative filenames with no slashes in TZ variableRich Felker-12/+8
since the form TZ=name is reserved for POSIX-form time zone strings, TZ=:name needs to be used when the zoneinfo filename is in the top-level zoneinfo directory and therefore does not contain a slash. previously the leading colon was merely dropped, making it impossible to access such zones without a full absolute pathname. changes based on patch by Timo Teräs.
2014-04-20expose public execvpe interfaceM Farkas-Dyck-0/+4
2014-04-18fix false negatives with periodic needles in strstr, wcsstr, and memmemRich Felker-3/+3
in cases where the memorized match range from the right factor exceeded the length of the left factor, it was wrongly treated as a mismatch rather than a match. issue reported by Yves Bastide.
2014-04-17make socketcall types common as they are same for all architecturesTimo Teräs-40/+23
2014-04-16add options when explicitly invoking dynamic loaderRich Felker-2/+21
so far the options are --library-path and --preload which override the corresponding environment variables, and --list which forces the behavior of ldd even if the invocation name is not ldd. both the two-arg form and the one-arg form using an equals sign are supported. based loosely on a patch proposed by Rune.
2014-04-16release 1.1.0v1.1.0Rich Felker-1/+29
2014-04-16add working vdso clock_gettime support, including static linkingRich Felker-5/+108
the vdso symbol lookup code is based on the original 2011 patch by Nicholas J. Kain, with some streamlining, pointer arithmetic fixes, and one symbol version matching fix. on the consumer side (clock_gettime), per-arch macros for the particular symbol name and version to lookup are added in syscall_arch.h, and no vdso code is pulled in on archs which do not define these macros. at this time, vdso is enabled only on x86_64. the vdso support at the dynamic linker level is no longer useful to libc, but is left in place for the sake of debuggers (which may need the vdso in the link map to find its functions) and possibly use with dlsym.
2014-04-15fix deadlock race in pthread_onceRich Felker-2/+1
at the end of successful pthread_once, there was a race window during which another thread calling pthread_once would momentarily change the state back from 2 (finished) to 1 (in-progress). in this case, the status was immediately changed back, but with no wake call, meaning that waiters which arrived during this short window could block forever. there are two possible fixes. one would be adding the wake to the code path where it was missing. but it's better just to avoid reverting the status at all, by using compare-and-swap instead of swap.
2014-04-15fix RLIMIT_ constants for mipsSzabolcs Nagy-2/+10
The mips arch is special in that it uses different RLIMIT_ numbers than other archs, so allow bits/resource.h to override the default RLIMIT_ numbers (empty on all archs except mips). Reported by orc.
2014-04-15add _SC_PHYS_PAGES and _SC_AVPHYS_PAGES extentions to sysconfRich Felker-2/+17
2014-04-15add namespace-protected name for sysinfo functionRich Felker-7/+9
it will be needed to implement some things in sysconf, and the syscall can't easily be used directly because the x32 syscall uses the wrong structure layout. the l (uncreative, for "linux") prefix is used since the symbol name __sysinfo is already taken for AT_SYSINFO from the aux vector. the way the x32 override of this function works is also changed to be simpler and avoid the useless jump instruction.
2014-04-15in sysconf, use getrlimit function rather than raw syscall for rlimitsRich Felker-3/+3
the syscall is deprecated (replaced by prlimit64) and does not work correctly on x32. this change mildly increases size, but is likely needed anyway for newer archs that might omit deprecated syscalls.
2014-04-15avoid linear-time if/else special cases in sysconfRich Felker-20/+35
the previous handling of cases that could not fit in the 16-bit table or which required non-constant results was extremely ugly and could not scale. the new code remaps these keys into a contiguous range that's efficient for a switch statement.
2014-04-14fix fallback code for old kernels in clock_gettimeRich Felker-1/+1
2014-04-14use dmb barrier instruction for atomics on arm v7Rich Felker-2/+9
aside from potentially offering better performance, this change is needed since the old coprocessor-based approach to barriers is deprecated in arm v7, and some compilers/assemblers issue errors when using the deprecated instruction for v7 targets.
2014-04-12use hidden visibility rather than protected for syscall internalsRich Felker-1/+1
the use of visibility at all is purely an optimization to avoid the need for the caller to load the GOT register or similar to prepare for a call via the PLT. there is no reason for these symbols to be externally visible, so hidden works just as well as protected, and using protected visibility is undesirable due to toolchain bugs and the lack of testing it receives. in particular, GCC's microblaze target is known to generate symbolic relocations in the GOT for functions with protected visibility. this in turn results in a dynamic linker which crashes under any nontrivial usage that requires making a syscall before symbolic relocations are processed.
2014-04-11math: fix aliasing violation in long double wrappersSzabolcs Nagy-2/+10
modfl and sincosl were passing long double* instead of double* to the wrapped double precision functions (on archs where long double and double have the same size). This is fixed now by using temporaries (this is not optimized to a single branch so the generated code is a bit bigger). Found by Morten Welinder.
2014-04-09fix search past the end of haystack in memmemTimo Teräs-0/+1
to optimize the search, memchr is used to find the first occurrence of the first character of the needle in the haystack before switching to a search for the full needle. however, the number of characters skipped by this first step were not subtracted from the haystack length, causing memmem to search past the end of the haystack.
2014-04-07fix printf rounding with %g for some corner case midpointsRich Felker-1/+1
the subsequent rounding code assumes the end pointer (z) accurately reflects the end of significance in the decimal expansion, but for certain large integers, spurious trailing zero slots were left behind when applying the binary exponent. issue reported by Morten Welinder; the analysis of the cause was performed by nsz, who also proposed this change.
2014-04-07fix arm atomic asm register constraintRich Felker-1/+1
the "m" constraint could give a memory reference with an offset that's not compatible with ldrex/strex, so the arm-specific "Q" constraint is needed instead.
2014-04-07use inline atomics and thread pointer on arm models supporting themRich Felker-1/+36
this is perhaps not the optimal implementation; a_cas still compiles to nested loops due to the different interface contracts of the kuser helper cas function (whose contract this patch implements) and the a_cas function (whose contract mimics the x86 cmpxchg). fixing this may be possible, but it's more complicated and thus deferred until a later time. aside from improving performance and code size, this patch also provides a means of producing binaries which can run on hardened kernels where the kuser helpers have been disabled. however, at present this requires producing binaries for armv6k or later, which will not run on older cpus. a real solution to the problem of kernels that omit the kuser helpers would be runtime detection, so that universal binaries which run on all arm cpu models can also be compatible with all kernel hardening profiles. robust detection however is a much harder problem, and will be addressed at a later time.
2014-04-07add getauxval functionRich Felker-0/+28
in a sense this implementation is incomplete since it doesn't provide the HWCAP_* macros for use with AT_HWCAP, which is perhaps the most important intended usage case for getauxval. they will be added at a later time.
2014-04-07fix failure of printf %g to strip trailing zeros in some casesRich Felker-1/+1
the code to strip trailing zeros was only looking in the last slot for up to 9 zeros, assuming that the rounding code had already removed fully-zero slots from the end. however, this ignored cases where the rounding code did not run at all, which occur when the value being printed is exactly representable in the requested precision. the simplest solution is to move the code that strips trailing zero slots to run unconditionally, immediately after rounding, rather than as the last step of rounding.
2014-04-07fix carry into uninitialized slots during printf floating point roundingRich Felker-1/+1
in cases where rounding caused a carry, the slot into which the carry was taking place was unconditionally treated as valid, despite the possibility that it could be a new slot prior to the beginning of the existing non-rounded number. in theory this could lead to unbounded runaway carry, but in order for that to happen, the whole uninitialized buffer would need to have been pre-filled with 32-bit integer values greater than or equal to 999999999. patch based on proposed fix by Morten Welinder, who also discovered and reported the bug.
2014-04-07remove some cruft from libc/tls init codeRich Felker-3/+0
2014-04-04remove cruft left behind when lazy thread pointer init was removedRich Felker-8/+0
the function itself was static, but the weak alias provided an externally visible reference and thus prevented the dead code from being omitted from the output. so this change actually reduces bloat in mandatory static-linked code.
2014-04-02add __sigsetjmp ABI-compat alias for sigsetjmpRich Felker-1/+28
2014-04-02remove struct elem entirely from hsearch.csin-29/+22
There are two changes here, both of which make sense to be done in a single patch: - Remove hash from struct elem and compute it at runtime wherever necessary. - Eliminate struct elem and use ENTRY directly. As a result we cut down on the memory usage as each element in the hash table now contains only an ENTRY not an ENTRY + size_t for the hash. The downside is that the hash needs to be computed at runtime.
2014-04-02implement hcreate_r, hdestroy_r and hsearch_rsin-30/+85
the size and alignment of struct hsearch_data are matched to the glibc definition for binary compatibility. the members of the structure do not match, which should not be a problem as long as applications correctly treat the structure as opaque. unlike the glibc implementation, this version of hcreate_r does not require the caller to zero-fill the structure before use.
2014-04-02avoid malloc failure for small requests when brk can't be extendedRich Felker-1/+23
this issue mainly affects PIE binaries and execution of programs via direct invocation of the dynamic linker binary: depending on kernel behavior, in these cases the initial brk may be placed at at location where it cannot be extended, due to conflicting adjacent maps. when brk fails, mmap is used instead to expand the heap. in order to avoid expensive bookkeeping for managing fragmentation by merging these new heap regions, the minimum size for new heap regions increases exponentially in the number of regions. this limits the number of regions, and thereby the number of fixed fragmentation points, to a quantity which is logarithmic with respect to the size of virtual address space and thus negligible. the exponential growth is tuned so as to avoid expanding the heap by more than approximately 50% of its current total size.
2014-04-02fix microblaze syscall register clobbersRich Felker-7/+7
the kernel entry point for syscalls on microblaze nominally saves and restores all registers, and testing on qemu always worked since qemu behaves this way too. however, the real kernel treats r3:r4 as a potential 64-bit return value from the syscall function, and copies both over top of the saved registers before returning to userspace. thus, we need to treat r4 as always-clobbered.
2014-03-25remove lazy ssp initializationTimo Teräs-28/+5
now that thread pointer is initialized always, ssp canary initialization can be done unconditionally. this simplifies the ldso as it does not try to detect ssp usage, and the init function itself as it is always called exactly once. this also merges ssp init path for shared and static linking.