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2012-11-05fix numerous mips abi constant definition mismatchesRich Felker3-89/+120
2012-10-19fix struct stat size/padding on microblazeRich Felker1-1/+2
2012-10-18inline syscalls for microblazeRich Felker1-0/+97
2012-10-18better support for reverse-endian variants of arm/mips/microblazeRich Felker3-0/+12
these macros are supported by more compilers
2012-10-18floating point environment/exceptions support for mipsRich Felker1-3/+13
2012-10-15microblaze TLS relocation support, completely untestedRich Felker1-0/+6
2012-10-15add support for TLS variant I, presently needed for arm and mipsRich Felker7-11/+33
despite documentation that makes it sound a lot different, the only ABI-constraint difference between TLS variants II and I seems to be that variant II stores the initial TLS segment immediately below the thread pointer (i.e. the thread pointer points to the end of it) and variant I stores the initial TLS segment above the thread pointer, requiring the thread descriptor to be stored below. the actual value stored in the thread pointer register also tends to have per-arch random offsets applied to it for silly micro-optimization purposes. with these changes applied, TLS should be basically working on all supported archs except microblaze. I'm still working on getting the necessary information and a working toolchain that can build TLS binaries for microblaze, but in theory, static-linked programs with TLS and dynamic-linked programs where only the main executable uses TLS should already work on microblaze. alignment constraints have not yet been heavily tested, so it's possible that this code does not always align TLS segments correctly on archs that need TLS variant I.
2012-10-13ensure pointer decay in inline-asm arg for i386 syscall6Rich Felker1-1/+1
this is actually a rather subtle issue: do arrays decay to pointers when used as inline asm args? gcc says yes, but currently pcc says no. hopefully this discrepency in pcc will be fixed, but since the behavior is not clearly defined anywhere I can find, I'm using an explicit operation to cause the decay to occur.
2012-10-11i386 vsyscall support (vdso-provided sysenter/syscall instruction based)Rich Felker1-66/+7
this doubles the performance of the fastest syscalls on the atom I tested it on; improvement is reportedly much more dramatic on worst-case cpus. cannot be used for cancellable syscalls.
2012-10-05fix incorrect TLS reloc macro names in x86_64 reloc.hRich Felker1-3/+3
2012-10-04dynamic-linked TLS support for everything but dlopen'd libsRich Felker5-5/+63
currently, only i386 is tested. x86_64 and arm should probably work. the necessary relocation types for mips and microblaze have not been added because I don't understand how they're supposed to work, and I'm not even sure if it's defined yet on microblaze. I may be able to reverse engineer the requirements out of gcc/binutils output.
2012-09-29microblaze portRich Felker29-0/+1962
based on initial work by rdp, with heavy modifications. some features including threads are untested because qemu app-level emulation seems to be broken and I do not have a proper system image for testing.
2012-09-22fix IPC_64 in msgctl tooRich Felker1-0/+2
2012-09-22fix broken semctl on systems that don't use IPC_64 flagRich Felker3-0/+6
not tested on mips and arm; they may still be broken. x86_64 should be ok now.
2012-09-15add O_EXEC open modeRich Felker4-0/+4
the linux O_PATH mode provides the necessary semantics for both the O_SEARCH and O_EXEC modes defined and required by POSIX 2008.
2012-09-15fix syscall asm constraints for arm tooRich Felker1-4/+4
no problems were detected so far, but the constraints seem to have been invalid just like the mips ones.
2012-09-15fix buggy constraints in mips inline syscall asmRich Felker1-2/+2
if same register is used for input/output, the compiler must be told. otherwise is generates random junk code that clobbers the result. in pure syscall-wrapper functions, nothing went wrong, but in more complex functions where register allocation is non-trivial, things broke badly.
2012-09-13add O_PATH/O_SEARCH support to fcntl.hRich Felker4-0/+8
I'm not 100% sure that Linux's O_PATH meets the POSIX requirements for O_SEARCH, but it seems very close if not perfect. and old kernels ignore it, so O_SEARCH will still work as desired as long as the caller has read permissions to the directory.
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,$0,%2 which can take either an immediate or a register for %2, the new inline asm admits maximal optimization with no register spillage to the stack when the compiler successfully performs constant propagration, but still works by allocating a register when the syscall number cannot be recognized as a constant. in the case of syscalls with 0-3 arguments it barely matters, but for 4-argument syscalls, using an immediate for the syscall number avoids creating a stack frame for the syscall wrapper function.
2012-09-10eliminate assumption that mips syscall restart preserves r25Rich Felker1-23/+12
all past and current kernel versions have done so, but there seems to be no reason it's necessary and the sentiment from everyone I've asked has been that we should not rely on it. instead, use r7 (an argument register) which will necessarily be preserved upon syscall restart. however this only works for 0-3 argument syscalls, and we have to resort to the function call for 4-argument syscalls.
2012-09-09inline syscall support for armRich Felker1-0/+53
most pure-syscall-wrapper functions compile to the smallest/simplest code possible (save r7 ; load syscall # ; svc 0 ; restore r7 ; tail call to __syscall_ret).
2012-09-09inline syscall support for mipsRich Felker1-0/+57
this drastically reduces the size of some functions which are purely syscall wrappers. disabled for clang due to known bugs satisfying register constraints.
2012-09-08syscall organization overhaulRich Felker8-632/+282
now public syscall.h only exposes __NR_* and SYS_* constants and the variadic syscall function. no macros or inline functions, no __syscall_ret or other internal details, no 16-/32-bit legacy syscall renaming, etc. this logic has all been moved to src/internal/syscall.h with the arch-specific parts in arch/$(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, accept4, setns, and dup3 syscalls (linux extensions)Rich Felker1-0/+3
based on patch by Justin Cormack
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.
2012-09-02avoid "inline" in public headers for strict c89 compatibilityRich Felker4-35/+35
while musl itself requires a c99 compiler, some applications insist on being compiled with c89 compilers, and use of "inline" in the headers was breaking them. much of this had been avoided already by just skipping the inline keyword in pre-c99 compilers or modes, but this new unified solution is cleaner and may/should result in better code generation in the default gcc configuration.
2012-08-11avoid need for -march=mips2 to compile mips atomic.h asmRich Felker1-0/+8
linux guarantees ll/sc are always available. on mips1, they will be emulated by the kernel. thus they are part of the linux mips1 abi and safe to use.
2012-08-10use int instead of long for ptrdiff_t on all 32-bit archsRich Felker2-2/+2
this is needed to match the underlying "ABI" standards. it's not really an ABI issue since the binary representations are the same, but having the wrong type can lead to errors when the type arising from a difference-of-pointers expression does not match the defined type of ptrdiff_t. most of the problems affect C++, not C.
2012-08-10fix incorrect ptrdiff_t type on mipsRich Felker1-1/+1
2012-08-09add defines for number of sigset_t bytes syscalls expectRich Felker4-0/+8
yet another gratuitous mips incompatibility...
2012-08-07further fixes for mips ioctl.h headerRich Felker1-4/+4
untested; hopefully it's right now
2012-08-07fix another mips gratuitous-incompatibility bug: ioctl numbersRich Felker1-2/+2
2012-08-05fix socket.h on mipsRich Felker1-0/+3
why does mips have to be gratuitously incompatible in every possible imaginable way?
2012-08-05more stuff lost committing mips dynamic linkerRich Felker1-2/+2
2012-08-05mips dynamic linker supportRich Felker1-3/+53
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.
2012-07-22add floating point register saving/restoring to mips setjmp/longjmpRich Felker1-1/+1
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.
2012-07-12fix broken mips a_fetch_addRich Felker1-7/+7
sc was overwriting the result
2012-07-12mipsel (little endian) supportRich Felker1-1/+1
the fields in the mcontext_t are long long (for no good reason) even on 32-bit mips, so the offset of the instruction pointer (as a word) varies depending on endianness.
2012-07-12workaround another sendmsg kernel bug on 64-bit machinesRich Felker4-0/+29
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.
2012-07-12fix redef of sigprocmask constants on mipsRich Felker1-0/+3
this fix is easier than trying to reorder the header stuff
2012-07-12more mips bits-header fixesRich Felker1-2/+6
signal handling was very broken because of this
2012-07-12fix mips syscalls with long long argsRich Felker1-1/+1
like arm, mips requires 64-bit arguments to be "aligned" on an even register boundary.
2012-07-12fix mips mcontext_t structure sizeRich Felker1-1/+5
otherwise offs in ucontext_t will be wrong, and break code that inspects or modifies the signal makes (including cancellation code).
2012-07-11fix MAP_ANONYMOUS value for mips, remove cruft copied from i386Rich Felker1-2/+1
2012-07-11initial version of mips (o32) port, based on work by Richard Pennington (rdp)Rich Felker29-0/+2037
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.
2012-07-10support -mfpmath=387 on x86_64Rich Felker1-0/+4
apparently somebody wants this for something... and it doesn't hurt.
2012-07-10fix wrong value of FLT_EVAL_METHOD for x86_64Rich Felker1-1/+1
2012-07-08make arm syscalls (still non-inline) more efficientRich Felker1-6/+6
no need to pass zero for unused arguments; just omit them.
2012-07-08remove little-endian assumption from arm atomic.hRich Felker1-4/+6
this hidden endian dependency had left big endian arm badly broken.
2012-07-03jmp_buf overhaul fixing several issuesRich Felker3-3/+3
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.
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