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* work around nasty gcc bug in the i386 syscall asmRich Felker2012-04-041-4/+4
| | | | | | | | | | | | | | | | | | | | | when the "r" (register) constraint is used to let gcc choose a register, gcc will sometimes assign the same register that was used for one of the other fixed-register operands, if it knows the values are the same. one common case is multiple zero arguments to a syscall. this horribly breaks the intended usage, which is swapping the GOT pointer from ebx into the temp register and back to perform the syscall. presumably there is a way to fix this with advanced usage of register constaints on the inline asm, but having bad memories about hellish compatibility issues with different gcc versions, for the time being i'm just going to hard-code specific registers to be used. this may hurt the compiler's ability to optimize, but it will fix serious miscompilation issues. so far the only function i know what compiled incorrectly is getrlimit.c, and naturally the bug only applies to shared (PIC) builds, but it may be more extensive and may have gone undetected..
* fix DECIMAL_DIG definitionsRich Felker2012-03-213-0/+6
| | | | | | | | | | | | | DECIMAL_DIG is not the same as LDBL_DIG type_DIG is the maximimum number of decimal digits that can survive a round trip from decimal to type and back to decimal. DECIMAL_DIG is the minimum number of decimal digits required in order for any floating point type to survive the round trip to decimal and back, and it is generally larger than LDBL_DIG. since the exact formula is non-trivial, and defining it larger than necessary may be legal but wasteful, just define the right value in bits/float.h.
* use __attribute__((const)) on arm __pthread_self functionRich Felker2012-02-251-1/+3
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* add float_t and double_t to math.hRich Felker2012-02-153-0/+9
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* replace bad cancellation cleanup abi with a sane oneRich Felker2012-02-093-37/+0
| | | | | | | | | | | | | | | | | | | | | | the old abi was intended to duplicate glibc's abi at the expense of being ugly and slow, but it turns out glib was not even using that abi except on non-gcc-compatible compilers (which it doesn't even support) and was instead using an exceptions-in-c/unwind-based approach whose abi we could not duplicate anyway without nasty dwarf2/unwind integration. the new abi is copied from a very old glibc abi, which seems to still be supported/present in current glibc. it avoids all unwinding, whether by sjlj or exceptions, and merely maintains a linked list of cleanup functions to be called from the context of pthread_exit. i've made some care to ensure that longjmp out of a cleanup function should work, even though it is not required to. this change breaks abi compatibility with programs which were using pthread cancellation, which is unfortunate, but that's why i'm making the change now rather than later. considering that most pthread features have not been usable until recently anyway, i don't see it as a major issue at this point.
* add prlimit syscall wrapperRich Felker2012-01-201-0/+2
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* fix some details in ugly stuff that doesn't belong in libcRich Felker2011-10-171-6/+6
| | | | | patches by sh4rm4, presumably needed to make gdb or some similar junk happy...
* don't define wchar_t on c++Rich Felker2011-10-153-0/+6
| | | | | | it's a keyword in c++ (wtf). i'm not sure this is the cleanest solution; it might be better to avoid ever defining __NEED_wchar_t on c++. but in any case, this works for now.
* fix fcntl O_* flags for armRich Felker2011-10-051-4/+4
| | | | no idea why these 4 are permuted and the rest are standard/generic
* typo (copy 2) in arm reloc.hRich Felker2011-10-011-1/+1
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* typo in arm reloc.hRich Felker2011-10-011-1/+1
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* first attempt at arm dynamic linkingRich Felker2011-10-011-0/+26
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* "optimize" arm __pthread_selfRich Felker2011-09-221-4/+1
| | | | | | actually this is just to avoid gcc being stupid and refusing to inline the function version, even when the size cost is essentially identical whether it's inlined or not.
* fix x86_64 user.h (previously was just a copy of i386)Rich Felker2011-09-221-48/+13
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* cleanup/debloat i386 user.hRich Felker2011-09-221-43/+11
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* wrong __WORDSIZE in x86_64 headerRich Felker2011-09-221-1/+1
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* update syscalls with off_t arguments to handle argument alignment, if neededRich Felker2011-09-213-3/+6
| | | | | | the arm syscall abi requires 64-bit arguments to be aligned on an even register boundary. these new macros facilitate meeting the abi requirement without imposing significant ugliness on the code.
* fix the definition of struct statvfs to match lsb abiRich Felker2011-09-193-44/+18
| | | | | at the same time, make struct statfs match the traditional definition and make it more useful, especially the fsid_t stuff.
* cleanup redundancy in bits/signal.h versionsRich Felker2011-09-193-372/+31
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* fix the type of wchar_t on arm; support wchar_t varying with archRich Felker2011-09-194-6/+14
| | | | | | | | | | | | | | really wchar_t should never vary, but the ARM EABI defines it as an unsigned 32-bit int instead of a signed one, and gcc follows this nonsense. thus, to give a conformant environment, we have to follow (otherwise L""[0] and L'\0' would be 0U rather than 0, but the application would be unaware due to a mismatched definition for WCHAR_MIN and WCHAR_MAX, and Bad Things could happen with respect to signed/unsigned comparisons, promotions, etc.). fortunately no rules are imposed by the C standard on the relationship between wchar_t and wint_t, and WEOF has type wint_t, so we can still make wint_t always-signed and use -1 for WEOF.
* fix incorrect long double parameters on arm (and other future ports)Rich Felker2011-09-191-10/+10
| | | | | this was the cause of crashes in printf when attempting to print floating point values.
* initial commit of the arm portRich Felker2011-09-1827-0/+2076
| | | | | | | | | | | | | this port assumes eabi calling conventions, eabi linux syscall convention, and presence of the kernel helpers at 0xffff0f?0 needed for threads support. otherwise it makes very few assumptions, and the code should work even on armv4 without thumb support, as well as on systems with thumb interworking. the bits headers declare this a little endian system, but as far as i can tell the code should work equally well on big endian. some small details are probably broken; so far, testing has been limited to qemu/aboriginal linux.
* cleanup more bits cruft (sysmacros and socket)Rich Felker2011-09-184-413/+0
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* more bits junk (tcp.h)Rich Felker2011-09-182-2/+0
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* move invariant netinet/in.h stuff out of bits/in.hRich Felker2011-09-182-290/+0
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* security hardening: ensure suid programs have valid stdin/out/errRich Felker2011-08-232-0/+10
| | | | | | | | | | | this behavior (opening fds 0-2 for a suid program) is explicitly allowed (but not required) by POSIX to protect badly-written suid programs from clobbering files they later open. this commit does add some cost in startup code, but the availability of auxv and the security flag will be useful elsewhere in the future. in particular auxv is needed for static-linked vdso support, which is still waiting to be committed (sorry nik!)
* typo in macro definitions for x86_64Rich Felker2011-08-141-1/+1
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* ensure the compiler does not move around thread-register-based readsRich Felker2011-08-062-2/+2
| | | | | | if gcc decided to move this across a conditional that checks validity of the thread register, an invalid thread-register-based read could be performed and raise sigsegv.
* socket headers macro adjustment - workaround for buggy programsRich Felker2011-07-212-2/+2
| | | | some program was undefining AF_NETLINK and thereby breaking AF_ROUTE...
* fix some symbol resolution issues in dynamic linkerRich Felker2011-06-252-0/+2
| | | | | 1. search was wrongly beginning with lib itself rather than dso head 2. inconsistent resolution of function pointers for functions in plt
* move all limits that don't vary out of bits/limits.h, into main limits.hRich Felker2011-06-252-53/+2
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* proper path searching for dynamic linkerRich Felker2011-06-252-0/+4
| | | | | first, use $LD_LIBRARY_PATH unless suid. if that fails, read path from /etc/ld-musl-$ARCH.path and fallback to a builtin default.
* experimental dynamic linker!Rich Felker2011-06-182-0/+54
| | | | | | | | some notes: - library search path is hard coded - x86_64 code is untested and may not work - dlopen/dlsym is not yet implemented - relocations in read-only memory won't work
* __syscall5 inline is having trouble with PIC; just use the function for nowRich Felker2011-06-141-0/+7
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* use __WCHAR_TYPE__ on i386 if it is definedRich Felker2011-06-071-0/+4
| | | | | | | | | | | | | | unfortunately traditional i386 practice was to use "long" rather than "int" for wchar_t, despite the latter being much more natural and logical. we followed this practice, but it seems some compilers (clang and maybe certain gcc builds or others too..?) have switched to using int, resulting in spurious pointer type mismatches when L"..." wide strings are used. the best solution I could find is to use the compiler's definition of wchar_t if it exists, and otherwise fallback to the traditional definition. there's no point in duplicating this approach on 64-bit archs, as their only 32-bit type is int.
* use compiler builtins for variadic macros when availableRich Felker2011-04-272-1/+5
| | | | | | | | | | | this slightly cuts down on the degree musl "fights with" gcc, but more importantly, it fixes a critical bug when gcc inlines a variadic function and optimizes out the variadic arguments due to noticing that they were "not used" (by __builtin_va_arg). we leave the old code in place if __GNUC__ >= 3 is false; it seems like it might be necessary at least for tinycc support and perhaps if anyone ever gets around to fixing gcc 2.95.3 enough to make it work..
* add word-sized ctz function to atomic.hRich Felker2011-04-272-4/+16
| | | | | | strictly speaking this and a few other ops should be factored into asm.h or the file should just be renamed to asm.h, but whatever. clean it up someday.
* move wait.h macros out of bits. they do not vary.Rich Felker2011-04-214-46/+0
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* namespace fixes for sys/mman.hRich Felker2011-04-202-30/+30
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* add syscall wrappers for posix_fadvise, posix_fallocateRich Felker2011-04-202-0/+6
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* overhaul pthread cancellationRich Felker2011-04-175-9/+12
| | | | | | | | | | | | | | | | | | | | | | this patch improves the correctness, simplicity, and size of cancellation-related code. modulo any small errors, it should now be completely conformant, safe, and resource-leak free. the notion of entering and exiting cancellation-point context has been completely eliminated and replaced with alternative syscall assembly code for cancellable syscalls. the assembly is responsible for setting up execution context information (stack pointer and address of the syscall instruction) which the cancellation signal handler can use to determine whether the interrupted code was in a cancellable state. these changes eliminate race conditions in the previous generation of cancellation handling code (whereby a cancellation request received just prior to the syscall would not be processed, leaving the syscall to block, potentially indefinitely), and remedy an issue where non-cancellable syscalls made from signal handlers became cancellable if the signal handler interrupted a cancellation point. x86_64 asm is untested and may need a second try to get it right.
* fix O_SYNC definition, cleanup fcntl.hRich Felker2011-04-142-22/+10
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* fix FAPPEND typo on x86_64 (previously only fixed on i386)Rich Felker2011-04-141-1/+1
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* fcntl.h: move macros that do not vary between archs out of bitsRich Felker2011-04-142-48/+0
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* fix broken fcntl locks on x86_64Rich Felker2011-04-141-3/+3
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* fix typo in legacy FAPPEND definitionRich Felker2011-04-141-1/+1
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* numerous fixes to sysv ipcRich Felker2011-04-136-48/+36
| | | | | | | | | | some of these definitions were just plain wrong, others based on outdated ancient "non-64" versions of the kernel interface. as much as possible has now been moved out of bits/* these changes break abi (the old abi for these functions was wrong), but since they were not working anyway it can hardly matter.
* fix and cleanup suseconds_t/timeval stuff (broken on 64-bit)Rich Felker2011-04-131-1/+1
| | | | | trash in the upper 32 bits was making the kernel sleep forever in select on 64-bit systems.
* more types cleanupRich Felker2011-04-112-6/+0
| | | | | | | | the basic idea is that the only things in alltypes.h should be types that either vary from system to system (in practice, not just in theoretical la-la land - this is the implementation so we choose what constraints we want to impose on ports) or which are needed by multiple system headers.
* cleanup types stuff in headers, fix missing u_int*_t in sys/types.hRich Felker2011-04-112-22/+0
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