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2016-01-25move static/stub version of dladdr out of dynlink.cRich Felker2-9/+6
2016-01-25factor dlerror and error-setting code out of dynlink.cRich Felker2-32/+55
the ultimate goal of this change is to get all code used in libc.a out of dynlink.c, so that the dynamic linker code can be moved to its own tree and object files in the src tree can all be shared between libc.a and libc.so.
2016-01-25fix arm a_crash for big endianRich Felker1-2/+4
contrary to commit 89e149d275a7699a4a5e4c98bab267648f64cbba, big endian arm does need the instruction bytes in big endian order. rather than trying to use a special encoding that works as arm or thumb, simply encode the simplest/canonical undefined instructions dependent on whether __thumb__ is defined.
2016-01-25add native a_crash primitive for armRich Felker1-0/+10
the .byte directive encodes a guaranteed-undefined instruction, the same one Linux fills the kuser helper page with when it's disabled. the udf mnemonic and and .insn directives are not supported by old binutils versions, and larger-than-byte integer directives would produce the wrong output on big-endian.
2016-01-24add new IP_BIND_ADDRESS_NO_PORT and IPPROTO_MPLS to netinet/in.hSzabolcs Nagy1-0/+2
IP_BIND_ADDRESS_NO_PORT is a SOL_IP socket option to delay src port allocation until connect in case src ip is set with bind(port=0). new in linux v4.2, commit 90c337da1524863838658078ec34241f45d8394d IPPROTO_MPLS protocol number for mpls over ip. new in linux v4.2, commit 730fc4371333636a00fed32c587fc1e85c5367e2
2016-01-24update netinet/tcp.h for linux v4.2Szabolcs Nagy1-0/+7
TCP_CC_INFO is a new socket option to get congestion control info without netlink (union tcp_cc_info is in linux/inet_diag.h kernel header). linux commit 6e9250f59ef9efb932c84850cd221f22c2a03c4a TCP_SAVE_SYN, TCP_SAVED_SYN socket options are for saving and getting the SYN headers of passive connections in a server application. linux commit cd8ae85299d54155702a56811b2e035e63064d3d Add new tcpi_* fields to struct tcp_info implementing RFC4898 counters. linux commit 2efd055c53c06b7e89c167c98069bab9afce7e59
2016-01-24add MS_LAZYTIME mount option to sys/mount.hSzabolcs Nagy1-1/+2
new in linux 4.0 commit 0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8, used to update atime/mtime/ctime only in memory when possible.
2016-01-24add AF_MPLS (PF_MPLS) address family to socket.hSzabolcs Nagy1-0/+2
new in linux 4.0 commit 0189197f441602acdca3f97750d392a895b778fd.
2016-01-24add MSG_FASTOPEN sendmsg/sendto flag to socket.hSzabolcs Nagy1-0/+1
This was new in linux 3.5 in commit cf60af03ca4e71134206809ea892e49b92a88896, needed for tcp fastopen feature (sending data in TCP SYN packet).
2016-01-24clean powerpc syscall.hSzabolcs Nagy1-24/+0
remove ifdefs for powerpc64.
2016-01-24add missing powerpc specific PROT_SAO memory protection flagSzabolcs Nagy1-0/+1
this flag for strong access ordering was added in linux v2.6.27 commit aba46c5027cb59d98052231b36efcbbde9c77a1d
2016-01-24fix powerpc MCL_* mlockall flags in bits/mman.hSzabolcs Nagy1-2/+2
the definitions didn't match the linux uapi headers.
2016-01-24fix aarch64 atomics to load/store 32bit onlySzabolcs Nagy1-2/+2
a_ll/a_sc inline asm used 64bit register operands (%0) instead of 32bit ones (%w0), this at least broke a_and_64 (which always cleared the top 32bit, leaking memory in malloc).
2016-01-23improve aarch64 atomicsRich Felker1-16/+36
aarch64 provides ll/sc variants with acquire/release memory order, freeing us from the need to have full barriers both before and after the ll/sc operation. previously they were not used because the a_cas can fail without performing a_sc, in which case half of the barrier would be omitted. instead, define a custom version of a_cas for aarch64 which uses a_barrier explicitly when aborting the cas operation. aside from cas, other operations built on top of ll/sc are not affected since they never abort but rather loop until they succeed. a split ll/sc version of the pointer-sized a_cas_p is also introduced using the same technique. patch by Szabolcs Nagy.
2016-01-22add arch/abi info to dynamic linker's id/version outputRich Felker1-1/+1
2016-01-22remove arch/$(ARCH)/src from the build systemRich Felker1-1/+1
the files that used to come from extra src dirs under the arch dir have all been removed or moved to appropriate places under the main src tree.
2016-01-22remove sh port's __fpscr_values source fileRich Felker1-5/+0
commit f3ddd173806fd5c60b3f034528ca24542aecc5b9, the dynamic linker bootstrap overhaul, silently disabled the definition of __fpscr_values in this file since libc.so's copy of __fpscr_values now comes from crt_arch.h, the same place the public definition in the main program's crt1.o ultimately comes from. remove this file which is no longer in use.
2016-01-22move sh port's __shcall internal function from arch/sh/src to src treeRich Felker1-0/+0
2016-01-22move sh __unmapself code from arch/sh/src to main src treeRich Felker2-1/+1
2016-01-22move x32 sysinfo impl and syscall fixup code out of arch/x32/srcRich Felker3-1/+0
all such arch-specific translation units are being moved to appropriate arch dirs under the main src tree.
2016-01-22overhaul powerpc atomics for new atomics frameworkRich Felker1-14/+38
previously powerpc had a_cas defined in terms of its native ll/sc style operations, but all other atomics were defined in terms of a_cas. instead define a_ll and a_sc so the compiler can generate optimized versions of all the atomic ops and perform better inlining of a_cas. extracting the result of the sc (stwcx.) instruction is rather awkward because it's natively stored in a condition flag, which is not representable in inline asm. but even with this limitation the new code still seems significantly better.
2016-01-22clean up x86_64 (and x32) atomics for new atomics frameworkRich Felker2-113/+130
this commit mostly makes consistent things like spacing, function ordering in atomic_arch.h, argument names, use of volatile, etc. a_ctz_l was also removed from x86_64 since atomic.h provides it automatically using a_ctz_64.
2016-01-22clean up i386 atomics for new atomics frameworkRich Felker1-66/+58
this commit mostly makes consistent things like spacing, function ordering in atomic_arch.h, argument names, use of volatile, etc. the fake 64-bit and/or atomics are also removed because the shared atomic.h does a better job of implementing them; it avoids making two atomic memory accesses when only one 32-bit half needs to be touched. no major overhaul is needed or possible because x86 actually has native versions of all the usual atomic operations, rather than using ll/sc or needing cas loops.
2016-01-22overhaul mips atomics for new atomics frameworkRich Felker1-53/+31
2016-01-22move arm-specific translation units out of arch/arm/src, to src/*/armRich Felker9-1/+0
this is possible with the new build system that allows src/*/$(ARCH)/* files which do not shadow a file in the parent directory, and yields a more logical organization. eventually it will be possible to remove arch/*/src from the build system.
2016-01-21overhaul arm atomics for new atomics frameworkRich Felker1-142/+38
switch to ll/sc model so that new atomic.h can provide optimized versions of all the atomic primitives without needing an ll/sc loop written in asm for each one. all isa levels which use ldrex/strex now use the inline ll/sc model even if the type of barrier to use is not known until runtime (v6). the cas model is only used for arm v5 and earlier, and it has been optimized to make the call via inline asm with custom constraints rather than as a C function call.
2016-01-21overhaul aarch64 atomics for new atomics frameworkRich Felker1-174/+25
2016-01-21overhaul sh atomics for new atomics framework, add j-core cas.l backendRich Felker6-262/+110
sh needs runtime-selected atomic backends since there are a number of supported models that use non-forwards-compatible (non-smp-compatible) atomic mechanisms. previously, the code paths for this were highly inefficient since they involved C function calls with multiple branches in the callee and heavy spills in the caller. the new code performs calls the runtime-selected asm fragment from inline asm with extremely minimal clobbers, rather than using a function call. for the sh4a case where the atomic mechanism is known and there is no forward-compatibility issue, the movli.l and movco.l instructions are provided as a_ll and a_sc, allowing the new shared atomic.h to generate efficient inline versions of all the basic atomic operations without needing a cas loop.
2016-01-21refactor internal atomic.hRich Felker15-834/+491
rather than having each arch provide its own atomic.h, there is a new shared atomic.h in src/internal which pulls arch-specific definitions from arc/$(ARCH)/atomic_arch.h. the latter can be extremely minimal, defining only a_cas or new ll/sc type primitives which the shared atomic.h will use to construct everything else. this commit avoids making heavy changes to the individual archs' atomic implementations. definitions which are identical or near-identical to what the new shared atomic.h would produce have been removed, but otherwise the changes made are just hooking up the arch-specific files to the new infrastructure. major changes to take advantage of the new system will come in subsequent commits.
2016-01-20fix global visibility (vis.h) support for out-of-tree buildsRich Felker1-1/+1
commit 2f853dd6b9a95d5b13ee8f9df762125e0588df5d failed to change the test for -include vis.h support to use $srcdir, so vis.h was always disabled by configure for out-of-tree builds.
2016-01-20exclude vis.h when compiling assembly filesKhem Raj1-1/+1
otherwise C declarations are included into preprocessed (.S) asm source files, producing errors from the assembler.
2016-01-20simplify "make clean" and remove unneeded lib dir from treeRich Felker2-7/+1
the lib dir is automatically created if needed by the out-of-tree build logic, and now that all generated files are in obj and lib, deleting them is much simpler. using "rm -rf" is also more thorough, as it picks up object files that were left around from source files that no longer exist or which are no longer to be used because an arch-specific replacement file was added or removed.
2016-01-20deduplicate compiler invocation command line in makefileRich Felker1-7/+9
also clean up duplication of CFLAGS passing to assembler.
2016-01-20remove outdated/incorrect comment about AS_CMD from makefileRich Felker1-1/+0
2016-01-20remove support for subarch .sub files from the makefileRich Felker1-16/+2
as of commit af21a82ccc8687aa16e85def7db95efeae4cf72e, .sub files are no longer in use. removing the makefile machinery to handle them not only cleans up and simplifies the makefile, but also significantly reduces make's startup time.
2016-01-20fix build regression for arm pre-v7 from out-of-tree build patchRich Felker3-1/+1
commit 2f853dd6b9a95d5b13ee8f9df762125e0588df5d failed to replicate the old makefile logic that caused arch/arm/src/arm/atomics.s to be built. since this was the only .s file under arch/*/src, rather than trying to reproduce the old logic, I'm just moving it up a level and adjusting the glob pattern in the makefile to catch it. eventually arch/*/src will probably be removed in favor of moving all these files to appropriate src/*/$(ARCH) locations.
2016-01-20switch arm, sh, and mips fenv asm from .sub system to .S filesRich Felker12-6/+21
2016-01-20switch sh and mips setjmp asm from .sub system to .S filesRich Felker20-109/+12
2016-01-20fix dynamic linker path file selection for arm vs armhfRich Felker1-3/+3
the __SOFTFP__ macro which was wrongly being used does not reflect the ABI (arm vs armhf) but just the availability of floating point instructions/registers, so -mfloat-abi=softfp was wrongly being treated as armhf. __ARM_PCS_VFP is the correct predefined macro to check for the armhf EABI variant. this macro usage was corrected for the build process in commit 4918c2bb206bfaaf5a1f7d3448c2f63d5e2b7d56 but reloc.h was apparently overlooked at the time.
2016-01-20replace armhf math asm source files with inline asmRich Felker16-40/+60
this makes it possible to inline them with LTO, and is the simplest approach to eliminating the use of .sub files. this also makes VFP sqrt available for use with the standard EABI (plain arm rather than armhf subarch) when libc is built with -mfloat-abi=softfp. the same could have been done for fabs, but when the argument and return value are in integer registers, moving to VFP registers and back is almost certainly more costly than a simple integer operation.
2016-01-20adapt build of arm memcpy asm not to use .sub filesRich Felker4-2/+7
this depends on commit 9f5eb77992b42d484d69e879d24ef86466f20f21, which made it possible to use a .c file for arch-specific replacements, and on commit 2f853dd6b9a95d5b13ee8f9df762125e0588df5d, the out-of-tree build support, which made it so that src/*/$(ARCH)/* 'replacement' files get used even if they don't match the base name of a .c file in the parent directory.
2016-01-19eliminate separate static/shared CFLAGS vars in makefileRich Felker1-13/+13
this allows the rules for .o and .lo files to be identical, with -fPIC and -DSHARED added for .lo files via target-specific variable append. this is arguably cleaner now and will allow more cleanup and removal of redundant rule bodies after other prerequisite changes are made.
2016-01-19add support for arch-provided replacement files as .c or .SRich Felker1-3/+9
previously, replacement files provided in $(ARCH) dirs under src/ had to be .s files. in order to replace a file with C source, an empty .s file was needed there to suppress the original file, and a separate .c file was needed in arch/$(ARCH)/src/. support for .S is new and is aimed at short-term use eliminating .sub files. asm source files are still expected not to make any heavy preprocessor use, just simple conditionals on subarch. eventually most affected files may be replaced with C source files with minimal inline asm instead of asm source files.
2016-01-17netinet/tcp: Add TCPOPT, TCPOLEN constantsKylie McClain1-0/+13
Programs such as iptables depend on these constants, which can also be found defined in other libcs. Since only TCP_* is reserved as part of tcp.h's namespace, we hide them behind _BSD_SOURCE (and therefore _DEFAULT_SOURCE) to expose them by default, but keep it standard conforming.
2016-01-17fix if_nametoindex return value when socket open failsRon Yorston1-1/+1
The return value of if_nametoindex is unsigned; it should return 0 on error.
2016-01-17support out-of-tree buildPetr Hosek3-60/+101
this change adds support for building musl outside of the source tree. the implementation is similar to autotools where running configure in a different directory creates config.mak in the current working directory and symlinks the makefile, which contains the logic for creating all necessary directories and resolving paths relative to the source directory. to support both in-tree and out-of-tree builds with implicit make rules, all object files are now placed into a separate directory.
2016-01-06add missing protocols to protoent lookup functionsTimo Teräs1-1/+16
2015-12-29adjust mips crt_arch entry point asm to avoid assembler bugsRich Felker1-1/+4
apparently the .gpword directive does not work reliably with local text labels; values produced were offset by 64k from the correct value, resulting in incorrect computation of the got pointer at runtime. instead, use an external label so that the assembler does not munge the relocation; the linker will then get it right. commit 6fef8cafbd0f6f185897bc87feb1ff66e2e204e1 exposed this issue by removing the old, non-PIE-compatible handwritten crt1.s, which was not affected. presumably mips PIE executables (using Scrt1.o produced from crt_arch.h) were already affected at the time.
2015-12-29adjust i386 max_align_t definition to work around some broken compilersRich Felker1-3/+5
at least gcc 4.7 claims c++11 support but does not accept the alignas keyword, causing breakage when stddef.h is included in c++11 mode. instead, prefer using __attribute__((__aligned__)) on any compiler with GNU extensions, and only use the alignas keyword as a fallback for other C++ compilers. C code should not be affected by this patch.
2015-12-20fix overly pessimistic realloc strategy in getdelimRich Felker1-1/+1
previously, getdelim was allocating twice the space needed every time it expanded its buffer to implement exponential buffer growth (in order to avoid quadratic run time). however, this doubling was performed even when the final buffer length needed was already known, which is the common case that occurs whenever the delimiter is in the FILE's buffer. this patch makes two changes to remedy the situation: 1. over-allocation is no longer performed if the delimiter has already been found when realloc is needed. 2. growth factor is reduced from 2x to 1.5x to reduce the relative excess allocation in cases where the delimiter is not initially in the buffer, including unbuffered streams. in theory these changes could lead to quadratic time if the same buffer is reused to process a sequence of lines successively increasing in length, but once this length exceeds the stdio buffer size, the delimiter will not be found in the buffer right away and exponential growth will still kick in.
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