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* mips dynamic linker supportRich Felker2012-08-052-0/+49
| | | | | | | | | | | | | | | | | | not heavily tested, but the basics are working. the basic concept is that the dynamic linker entry point code invokes a pure-PIC (no global accesses) C function in reloc.h to perform the early GOT relocations needed to make the dynamic linker itself functional, then invokes __dynlink like on other archs. since mips uses some ugly arch-specific hacks to optimize relocating the GOT (rather than just using the normal DT_REL[A] tables like on other archs), the dynamic linker has been modified slightly to support calling arch-specific relocation code in reloc.h. most of the actual mips-specific behavior was developed by reading the output of readelf on libc.so and simple executable files. i could not find good reference information on which relocation types need to be supported or their semantics, so it's possible that some legitimate usage cases will not work yet.
* more cleanup of dynamic linker internalsRich Felker2012-08-051-8/+9
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* more dynamic linker internals cleanupRich Felker2012-08-051-6/+6
| | | | | | changing the string printed for the dso name is not a regression; the old code was simply using the wrong dso name (head rather than the dso currently being relocated). this will be fixed in a later commit.
* dynamic linker internals cleanupRich Felker2012-08-051-5/+7
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* floating point support for arm setjmp/longjmpRich Felker2012-08-052-2/+54
| | | | | | not heavily tested, but at least they don't seem to break anything on soft float targets with or without coprocessors. they check the auxv AT_HWCAP flags to determine which coprocessor, if any, is available.
* fix argument type error on wcwidth functionRich Felker2012-08-021-2/+2
| | | | | | | since the correct declaration was not visible, and since the representation of the types wchar_t and wint_t always match, a compiler would have to go out of its way to make this bug manifest, but better to fix it anyway.
* fix missing static in getusershell (namespace pollution)Rich Felker2012-08-021-1/+1
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* optimize mempcpy to minimize need for data saved across the callRich Felker2012-07-311-2/+1
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* optimize arm setjmp/longjmp register saving/loadingRich Felker2012-07-272-6/+2
| | | | | the original code was wrongly based on how it would be done in thumb mode, but that's not needed because musl's asm only targets arm.
* save AT_HWCAP from auxv for subsequent use in machine-specific codeRich Felker2012-07-273-0/+4
| | | | | | | it's expected that this will be needed/useful only in asm, so I've given it its own symbol that can be addressed in pc-relative ways from asm rather than adding a field in the __libc structure which would require hard-coding the offset wherever it's used.
* retry on cas failures in sem_trywaitRich Felker2012-07-241-2/+2
| | | | | | | | | this seems counter-intuitive since sem_trywait is supposed to just try once, not wait for the semaphore. however, the retry loop is not a wait. instead, it's to handle the case where the value changes due to a simultaneous post or wait from another thread while the semaphore value remains positive. in such a case, it's absolutely wrong for sem_trywait to fail with EAGAIN because the semaphore is not busy.
* add ioperm/iopl syscallsRich Felker2012-07-232-0/+18
| | | | | | | | | | | | | | | based on patches by orc and Isaac Dunham, with some fixes. sys/io.h exists and contains prototypes for these functions regardless of whether the target arch has them; this is a bit unorthodox but I don't think it will break anything. the function definitions do not exist unless the appropriate SYS_* syscall number macro is defined, which should make sure configure scripts looking for these functions don't find them on other systems. presently, sys/io.h does not have the inb/outb/etc. port io macros/functions. I'd be surprised if ioperm/iopl are useful without them, so they probably need to be added at some point in appropriate bits/io.h files...
* add splice and vmsplice syscallsRich Felker2012-07-232-0/+16
| | | | based on patches by orc and Isaac Dunham.
* add extended attributes syscallsRich Felker2012-07-231-0/+47
| | | | based on patch by orc and Isaac Dunham, with some fixes.
* add pipe2 syscallRich Felker2012-07-231-0/+8
| | | | based on patch by orc and Isaac Dunham, with some details fixed.
* remove scanf dependency from getaddrinfo /etc/services supportRich Felker2012-07-221-5/+4
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* getaddrinfo /etc/services lookup supportRich Felker2012-07-221-3/+16
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* add floating point register saving/restoring to mips setjmp/longjmpRich Felker2012-07-222-1/+29
| | | | | | | also fix the alignment of jmp_buf to meet the abi. linux always emulates fpu on mips if it's not present, so enabling this code unconditionally is "safe" but may be slow. in the long term it may be preferable to find a way to disable it on soft float builds.
* make getservby*_r return error code rather than -1 (and using errno)Rich Felker2012-07-222-19/+35
| | | | untested but should be correct..
* fix logic error for skipping failed interfaces in if_nameindexRich Felker2012-07-211-8/+7
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* fix getservby*() with null pointer for protocol argumentRich Felker2012-07-142-0/+8
| | | | not sure this is the best fix but it should work
* avoid blx instruction which does not exist on armv4t or armv4Rich Felker2012-07-141-1/+2
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* make dynamic linker tell the debugger its own pathnameRich Felker2012-07-131-0/+5
| | | | | use the main program's PT_INTERP header if possible, since this is sure to be a correct (and hopefully absolute) pathname.
* sigsetjmp asm for mipsRich Felker2012-07-121-0/+27
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* workaround another sendmsg kernel bug on 64-bit machinesRich Felker2012-07-121-0/+13
| | | | | | | | | the kernel wrongly expects the cmsg length field to be size_t instead of socklen_t. in order to work around the issue, we have to impose a length limit and copy to a local buffer. the length limit should be more than sufficient for any real-world use; these headers are only used for passing file descriptors and permissions between processes over unix sockets.
* fix several locks that weren't updated right for new futex-based __lockRich Felker2012-07-124-10/+10
| | | | | | these could have caused memory corruption due to invalid accesses to the next field. all should be fixed now; I found the errors with fgrep -r '__lock(&', which is bogus since the argument should be an array.
* fix pthread_kill unlockingRich Felker2012-07-121-1/+1
| | | | it had not been updated for the futex-based locks
* fix breakage of x86_64 sigaction from recent changes for mipsRich Felker2012-07-121-1/+1
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* fix potential race condition in detached threadsRich Felker2012-07-112-4/+10
| | | | | | | after the thread unmaps its own stack/thread structure, the kernel, performing child tid clear and futex wake, could clobber a new mapping made at the same location as the just-removed thread's tid field. disable kernel clearing of child tid to prevent this.
* mips clone: don't free stack space used to copy argRich Felker2012-07-111-1/+0
| | | | | | the mips abi reserves stack space equal to the size of the in-register args for the callee to save the args, if desired. this would cause the beginning of the thread structure to be clobbered...
* fix mips clone() on real linux kernelRich Felker2012-07-111-4/+7
| | | | | | the old code worked in qemu app-level emulation, but not on real kernels where the clone syscall does not copy the register values to the new thread. save arguments on the new thread stack instead.
* fix clone() on mips (args were in wrong order)Rich Felker2012-07-111-3/+2
| | | | with this change, threads on mips seem to be working
* first attempt at making threads work on mipsRich Felker2012-07-113-0/+67
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* generic c version of __set_thread_area for archs where it worksRich Felker2012-07-111-1/+5
| | | | on other archs, like x86[_64], asm version is required
* initial version of mips (o32) port, based on work by Richard Pennington (rdp)Rich Felker2012-07-115-0/+105
| | | | | | | | | | | | | basically, this version of the code was obtained by starting with rdp's work from his ellcc source tree, adapting it to musl's build system and coding style, auditing the bits headers for discrepencies with kernel definitions or glibc/LSB ABI or large file issues, fixing up incompatibility with the old binutils from aboriginal linux, and adding some new special cases to deal with the oddities of sigaction and pipe syscall interfaces on mips. at present, minimal test programs work, but some interfaces are broken or missing. threaded programs probably will not link.
* remove unused var in new sigaction codeRich Felker2012-07-111-1/+1
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* use unsigned bitmask for consistency in ksigactionRich Felker2012-07-111-1/+1
| | | | | the type doesn't actually matter, just the size, but it's nice to be consistent...
* fix breakage from last commit: forgot to include ksigaction.hRich Felker2012-07-111-0/+6
| | | | this file can be overridden by a same-named file in an arch dir.
* changes to kernel sigaction struct handling in preparation for mips portRich Felker2012-07-112-14/+17
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* make dynamic linker depend on -DSHARED not -fPICRich Felker2012-07-111-1/+1
| | | | | | if libc.a is compiled PIC for use in static PIE code, this should not cause the dynamic linker (which still does not support static-linked main program) to be built into libc.a.
* fix lots of breakage on dlopen, mostly with explicit pathnamesRich Felker2012-07-111-14/+21
| | | | | | | | | | | | | | | | | | most importantly, the name for such libs was being set from an uninitialized buffer. also, shortname always had an initial '/' character, making it useless for looking up already-loaded libraries by name, and thus causing repeated searches through the library path. major changes now: - shortname is the base name for library lookups with no explicit pathname. it's initially clear for libraries loaded with an explicit pathname (and for the main program), but will be set if the same library (detected via inodes match) is later found by a search. - exact name match is never used to identify libraries loaded with an explicit pathname. in this case, there's no explicit search, so we can just stat the file and check for inode match.
* fix dlsym RTLD_NEXT supportRich Felker2012-07-071-1/+3
| | | | | | | | previously this was being handled the same as a library-specific, dependency-order lookup on the next library in the global chain, which is likely to be utterly meaningless. instead the lookup needs to be in the global namespace, but omitting the initial portion of the global library chain up through the calling library.
* putw is supposed to return 0 (not the value written) on successRich Felker2012-07-041-1/+1
| | | | | this is not a standard but it's the traditional behavior and it's more useful because the caller can reliably detect errors.
* make sure getw/putw agree with prototypes by defining _GNU_SOURCERich Felker2012-07-042-0/+2
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* jmp_buf overhaul fixing several issuesRich Felker2012-07-032-10/+7
| | | | | | | | | | | | | on arm, the location of the saved-signal-mask flag and mask were off by one between sigsetjmp and siglongjmp, causing incorrect behavior restoring the signal mask. this is because the siglongjmp code assumed an extra slot was in the non-sig jmp_buf for the flag, but arm did not have this. now, the extra slot is removed for all archs since it was useless. also, arm eabi requires jmp_buf to have 8-byte alignment. we achieve that using long long as the type rather than with non-portable gcc attribute tags.
* fix sigsetjmp on arm (needs asm)Rich Felker2012-07-021-0/+13
| | | | | | no idea why gcc refuses to compile the C code to use a tail call, but it's best to use asm anyway so we don't have to rely on the quality of the compiler's optimizations for correct code.
* fix missing function declarations for __stdio_exitRich Felker2012-07-022-0/+4
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* fix missing prototype and simplify sincosl on ld64 archsRich Felker2012-07-021-4/+2
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* fix invalid implicit pointer conversion in ld64 modflRich Felker2012-07-021-1/+1
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* replace old and ugly crypt implementationRich Felker2012-06-293-2574/+1055
| | | | | | | | | | | | | | | | | | | | | | | | | the new version is largely the work of Solar Designer, with minor changes for integration with musl. compared to the old code, text size is reduced by about 7k, stack space usage by about 70k, and performance is greatly improved by avoiding expensive calculation of constant tables on each run. this version also adds support for extended des-based password hashes, which allow for unlimited key (password) length and configurable iteration counts. i've also published the interface for crypt_r in a new crypt.h header. especially since this is not a standard interface, i did not feel compelled to match the glibc abi for the crypt_data structure. the glibc structure is way too big to allocate on the stack; in fact it's so big that the first usage may cause the main thread to exceed its pre-committed stack size of 128k and thus could cause the program to crash even on systems with overcommit disabled. the only legitimate use of crypt_data for crypt_r is to store the hash string to return, so i've reserved 256 bytes, which should be more than sufficient (longest known password hashes are ~60 characters, and beyond that is possibly even exceeding some implementations' passwd file field size limit).
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