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2012-09-11improve mips syscall asm constraints to use immediates, if possibleRich Felker1-12/+21
by using the "ir" constraint (immediate or register) and the carefully constructed instruction addu $2,$0,%2 which can take either an immediate or a register for %2, the new inline asm admits maximal optimization with no register spillage to the stack when the compiler successfully performs constant propagration, but still works by allocating a register when the syscall number cannot be recognized as a constant. in the case of syscalls with 0-3 arguments it barely matters, but for 4-argument syscalls, using an immediate for the syscall number avoids creating a stack frame for the syscall wrapper function.
2012-09-10eliminate assumption that mips syscall restart preserves r25Rich Felker1-23/+12
all past and current kernel versions have done so, but there seems to be no reason it's necessary and the sentiment from everyone I've asked has been that we should not rely on it. instead, use r7 (an argument register) which will necessarily be preserved upon syscall restart. however this only works for 0-3 argument syscalls, and we have to resort to the function call for 4-argument syscalls.
2012-09-10asm for memmove on i386 and x86_64Rich Felker2-0/+36
for the sake of simplicity, I've only used rep movsb rather than breaking up the copy for using rep movsd/q. on all modern cpus, this seems to be fine, but if there are performance problems, there might be a need to go back and add support for rep movsd/q.
2012-09-10fix another ppoll issue (missing sigset_t size argument)Rich Felker1-1/+1
2012-09-10reenable word-at-at-time copying in memmoveRich Felker1-4/+27
before restrict was added, memove called memcpy for forward copies and used a byte-at-a-time loop for reverse copies. this was changed to avoid invoking UB now that memcpy has an undefined copying order, making memmove considerably slower. performance is still rather bad, so I'll be adding asm soon.
2012-09-10fix ppoll with null timeout argumentRich Felker1-2/+2
2012-09-10add LIBCC (compiler runtime) logic and override to configureRich Felker1-0/+7
this should both fix the issue with ARM needing -lgcc_eh (although that's really a bug in the libgcc build process that's causing considerable bloat, which should be fixed) and make it easier to build musl using clang/llvm in place of gcc. unfortunately I don't know a good way to detect and support pcc's -lpcc since it's not in pcc's default library search path...
2012-09-09add setdomainname syscall, fix getdomainname (previously a stub)Rich Felker3-1/+18
2012-09-09mincore syscall wrapperRich Felker2-0/+9
2012-09-09fix up lfs64 junk for preadv/pwritevRich Felker3-2/+7
2012-09-09add preadv/pwritev syscall wrappersRich Felker3-0/+35
2012-09-09fix typo introduced in poll.hRich Felker1-1/+1
2012-09-09add linux ppoll syscall wrapperRich Felker2-0/+19
2012-09-09reenable sync_file_range; should no longer break on mipsRich Felker1-2/+2
2012-09-09add 7-arg syscall support for mipsRich Felker2-4/+8
no syscalls actually use that many arguments; the issue is that some syscalls with 64-bit arguments have them ordered badly so that breaking them into aligned 32-bit half-arguments wastes slots with padding, and a 7th slot is needed for the last argument.
2012-09-09inline syscall support for armRich Felker1-0/+53
most pure-syscall-wrapper functions compile to the smallest/simplest code possible (save r7 ; load syscall # ; svc 0 ; restore r7 ; tail call to __syscall_ret).
2012-09-09inline syscall support for mipsRich Felker1-0/+57
this drastically reduces the size of some functions which are purely syscall wrappers. disabled for clang due to known bugs satisfying register constraints.
2012-09-09fix mips syscall_cp_asm code (saved register usage)Rich Felker1-2/+2
2012-09-09fix broken mips syscall asmRich Felker1-2/+2
this code was using $10 to save the syscall number, but $10 is not necessarily preserved by the kernel across syscalls. only mattered for syscalls that got interrupted by a signal and restarted. as far as i can tell, $25 is preserved by the kernel across syscalls.
2012-09-08disable sync_file_range for nowRich Felker1-2/+3
something is wrong with the logic for the argument layout, resulting in compile errors on mips due to too many args to syscall... further information on how it's supposed to work will be needed before it can be reactivated.
2012-09-08syscall organization overhaulRich Felker10-655/+420
now public syscall.h only exposes __NR_* and SYS_* constants and the variadic syscall function. no macros or inline functions, no __syscall_ret or other internal details, no 16-/32-bit legacy syscall renaming, etc. this logic has all been moved to src/internal/syscall.h with the arch-specific parts in arch/$(ARCH)/syscall_arch.h, and the amount of arch-specific stuff has been reduced to a minimum. changes still need to be reviewed/double-checked. minimal testing on i386 and mips has already been performed.
2012-09-08add acct syscall source file, omitted in last syscalls commitRich Felker1-0/+9
2012-09-08add acct, accept4, setns, and dup3 syscalls (linux extensions)Rich Felker8-0/+113
based on patch by Justin Cormack
2012-09-08add IPPROTO_HOPOPTS to in.hRich Felker1-0/+1
2012-09-08add IPPROTO_MAX to in.hRich Felker1-0/+1
2012-09-08fix redundant _Noreturn def in err.hRich Felker1-7/+1
not sure why this was missed in the earlier commit.
2012-09-08remove all remaining redundant __restrict/__inline/_Noreturn defsRich Felker14-76/+14
2012-09-08sysmacros major/minor: result should have type unsigned int, not dev_tRich Felker1-2/+2
2012-09-08add linux tee syscallRich Felker2-0/+9
2012-09-08add linux sync_file_range syscallRich Felker2-0/+20
2012-09-08move fallocate syscall wrapper to linux-specific syscalls dirRich Felker1-0/+0
2012-09-08add linux readahead syscallRich Felker2-0/+9
2012-09-08add fallocate (nonstandardized) functionRich Felker2-0/+12
this is equivalent to posix_fallocate except that it has an extra mode/flags argument to control its behavior, and stores the error in errno rather than returning an error code.
2012-09-08fix broken fallocate syscall in posix_fallocateRich Felker1-1/+1
the syscall takes an extra flag argument which should be zero to meet the POSIX requirements.
2012-09-08add timerfd interfaces (untested)Rich Felker2-0/+35
2012-09-08add stdnoreturn.h (C11)Rich Felker1-0/+5
features.h contains the fallback logic for pre-C11 compilers
2012-09-07TCP_* is in the reserved namespace for tcp.h; make use of thatRich Felker1-3/+4
2012-09-07remove unneeded judgemental commentary from ftw.hRich Felker1-4/+0
2012-09-07default features: make musl usable without feature test macrosRich Felker48-129/+102
the old behavior of exposing nothing except plain ISO C can be obtained by defining __STRICT_ANSI__ or using a compiler option (such as -std=c99) that predefines it. the new default featureset is POSIX with XSI plus _BSD_SOURCE. any explicit feature test macros will inhibit the default. installation docs have also been updated to reflect this change.
2012-09-07add clang-compatible thread-pointer code for mipsRich Felker1-0/+4
clang does not presently support the "v" constraint we want to use to get the result from $3, and trying to use register...__asm__("$3") to do the same invokes serious compiler bugs. so for now, i'm working around the issue with an extra temp register and putting $3 in the clobber list instead of using it as output. when the bugs in clang are fixed, this issue should be revisited to generate smaller/faster code like what gcc gets.
2012-09-07cleanup src/linux and src/misc trees, etc.Rich Felker45-98/+74
previously, it was pretty much random which one of these trees a given function appeared in. they have now been organized into: src/linux: non-POSIX linux syscalls (possibly shard with other nixen) src/legacy: various obsolete/legacy functions, mostly wrappers src/misc: still mostly uncategorized; some misc POSIX, some nonstd src/crypt: crypt hash functions further cleanup will be done later.
2012-09-06fix constraint violation in ftwRich Felker1-1/+4
void* does not implicitly convert to function pointer types.
2012-09-06provide loff_t for splice syscallRich Felker1-0/+1
so far, this is the only actual use of loff_t i've found. some software, including glib, assumes loff_t must exist if splice exists; this is a reasonable assumption since the official prototype for splice uses loff_t, as it always works with 64-bit offsets regardless of the selected libc off_t size. i'm using #define for now rather than a typedef to make it easy to define in other headers if necessary (like the LFS64 ugliness), but it may be necessary to add it to alltypes.h eventually if other functions end up needing it.
2012-09-06further use of _Noreturn, for non-plain-C functionsRich Felker11-19/+47
note that POSIX does not specify these functions as _Noreturn, because POSIX is aligned with C99, not the new C11 standard. when POSIX is eventually updated to C11, it will almost surely give these functions the _Noreturn attribute. for now, the actual _Noreturn keyword is not used anyway when compiling with a c99 compiler, which is what POSIX requires; the GCC __attribute__ is used instead if it's available, however. in a few places, I've added infinite for loops at the end of _Noreturn functions to silence compiler warnings. presumably __buildin_unreachable could achieve the same thing, but it would only work on newer GCCs and would not be portable. the loops should have near-zero code size cost anyway. like the previous _Noreturn commit, this one is based on patches contributed by philomath.
2012-09-06fix invalid implicit pointer conversion in gnulib-compat functionsRich Felker1-1/+1
2012-09-06add _Noreturn function attribute, with fallback for pre-C11 GNUCRich Felker6-9/+23
2012-09-06dladdr should be available under _BSD_SOURCE as well as _GNU_SOURCERich Felker1-1/+1
2012-09-06use restrict everywhere it's required by c99 and/or posix 2008Rich Felker192-382/+552
to deal with the fact that the public headers may be used with pre-c99 compilers, __restrict is used in place of restrict, and defined appropriately for any supported compiler. we also avoid the form [restrict] since older versions of gcc rejected it due to a bug in the original c99 standard, and instead use the form *restrict.
2012-09-06remove dependency of wmemmove on wmemcpy directionRich Felker1-4/+4
unlike the memmove commit, this one should be fine to leave in place. wmemmove is not performance-critical, and even if it were, it's already copying whole 32-bit words at a time instead of bytes.
2012-09-06remove dependency of memmove on memcpy directionRich Felker1-5/+4
this commit introduces a performance regression in many uses of memmove, which will need to be addressed before the next release. i'm making it as a temporary measure so that the restrict patch can be committed without invoking undefined behavior when memmove calls memcpy with overlapping regions.
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