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* fix stack protector crashes on x32 & powerpc due to misplaced TLS canaryRich Felker2015-05-065-3/+11
| | | | | | | | | | | | | | | | | | | i386, x86_64, x32, and powerpc all use TLS for stack protector canary values in the default stack protector ABI, but the location only matched the ABI on i386 and x86_64. on x32, the expected location for the canary contained the tid, thus producing spurious mismatches (resulting in process termination) upon fork. on powerpc, the expected location contained the stdio_locks list head, so returning from a function after calling flockfile produced spurious mismatches. in both cases, the random canary was not present, and a predictable value was used instead, making the stack protector hardening much less effective than it should be. in the current fix, the thread structure has been expanded to have canary fields at all three possible locations, and archs that use a non-default location must define a macro in pthread_arch.h to choose which location is used. for most archs (which lack TLS canary ABI) the choice does not matter.
* improve iswdigit macro to diagnose errorsRich Felker2015-05-022-2/+2
| | | | | this is analogous to commit 2ca55a93f2a11185d72dcb69006fd2c30b5c3144 for the macros in ctype.h.
* fix broken cancellation on x32 due to incorrect saved-PC offsetRich Felker2015-05-021-1/+1
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* fix crash in x32 sigsetjmpRich Felker2015-05-021-0/+1
| | | | | | | | | | | the 64-bit push reads not only the 32-bit return address but also the first 32 signal mask bits. if any were nonzero, the return address obtained will be invalid. at some point storage of the return address should probably be moved to follow the saved mask so that there's plenty room and the same code can be used on x32 and regular x86_64, but for now I want a fix that does not risk breaking x86_64, and this simple re-zeroing works.
* fix x32 __set_thread_area failure due to junk in upper bitsRich Felker2015-05-021-1/+1
| | | | | the kernel does not properly clear the upper bits of the syscall argument, so we have to do it before the syscall.
* fix dangling pointers in x32 syscall timespec fixup codeRich Felker2015-05-012-10/+23
| | | | | | | the lifetime of compound literals is the block in which they appear. the temporary struct __timespec_kernel objects created as compound literals no longer existed at the time their addresses were passed to the kernel.
* add IPTOS_CLASS_* macros to netinet/ip.hSzabolcs Nagy2015-05-011-0/+12
| | | | | These macros were introduced in glibc 2.12 to follow RFC 2474 which deprecates "IP Precedence" in favor of "Class Selector Codepoints".
* complex: fix ctanh(+-0+i*nan) and ctanh(+-0+-i*inf)Szabolcs Nagy2015-05-012-2/+4
| | | | | These cases were incorrect in C11 as described by http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1886.htm
* fix integer overflow in elf.h macro SHF_EXCLUDERich Felker2015-05-011-1/+1
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* fix mishandling of ENOMEM return case in internal getgrent_a functionRich Felker2015-05-011-1/+2
| | | | | | | | due to an incorrect return statement in this error case, the previously blocked cancellation state was not restored and no result was stored. this could lead to invalid (read) accesses in the caller resulting in crashes or nonsensical result data in the event of memory exhaustion.
* fix __syscall declaration with wrong visibility in syscall_arch.hSzabolcs Nagy2015-04-305-8/+3
| | | | | remove __syscall declaration where it is not needed (aarch64, arm, microblaze, or1k) and add the hidden attribute where it is (mips).
* aarch64: fix CRTJMP in reloc.hSzabolcs Nagy2015-04-301-1/+1
| | | | | commit f3ddd173806fd5c60b3f034528ca24542aecc5b9 broke the build by using "bx" instead of "br".
* fix sh jmp_buf size to match ABIRich Felker2015-04-272-3/+3
| | | | | | | | | | | | | | | | | while the sh port is still experimental and subject to ABI instability, this is not actually an application/libc boundary ABI change. it only affects third-party APIs where jmp_buf is used in a shared structure at the ABI boundary, because nothing anywhere near the end of the jmp_buf object (which includes the oversized sigset_t) is accessed by libc. both glibc and uclibc have 15-slot jmp_buf for sh. presumably the smaller version was used in musl because the slots for fpu status register and thread pointer register (gbr) were incorrect and must not be restored by longjmp, but the size should have been preserved, as it's generally treated as a libc-agnostic ABI property for the arch, and having extra slots free in case we ever need them for something is useful anyway.
* fix name of sh crt asm directoryRich Felker2015-04-272-0/+0
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* fix build regression in aarch64 sigsetjmpRich Felker2015-04-241-2/+2
| | | | | at least some assembler versions do not accept the register name lr. use the name x30 instead.
* fix ldso name for sh-nofpu subarchRich Felker2015-04-241-1/+7
| | | | | | | | | | | | | | | previously it was using the same name as the default ABI with hard float (floating point args and return value in registers). the test __SH_FPU_ANY__ || __SH4__ matches what's used in the configure script already, and seems correct under casual review against gcc's config/sh.h, but may need tweaks. the logic for predefined macros for sh, and what they all mean, is very complex. eventually this should be documented in comments here. configure already rejects "half-hard" configurations on sh where double=float since these do not conform to Annex F and are not suitable for musl, so these do not need to be considered here.
* fix build regression in sh-nofpu subarch due to missing symbolRich Felker2015-04-241-0/+3
| | | | | | commit 646cb9a4a04e5ed78e2dd928bf9dc6e79202f609 switched sigsetjmp to use the new hidden ___setjmp symbol for setjmp, but the nofpu variant of setjmp.s was not updated to match.
* fix failure of sh reloc.h to properly detect endianness for ldso nameRich Felker2015-04-241-0/+2
| | | | | versions of reloc.h that rely on endian macros much include endian.h to ensure they are available.
* fix misalignment of dtv in static-linked programs with odd-sized TLSRich Felker2015-04-231-1/+2
| | | | | | | | | | both static and dynamic linked versions of the __copy_tls function have a hidden assumption that the alignment of the beginning or end of the memory passed is suitable for storing an array of pointers for the dtv. pthread_create satisfies this requirement except when libc.tls_size is misaligned, which cannot happen with dynamic linking due to way update_tls_size computes the total size, but could happen with static linking and odd-sized TLS.
* remove dead store from static __init_tlsRich Felker2015-04-231-2/+0
| | | | | | commit dab441aea240f3b7c18a26d2ef51979ea36c301c, which made thread pointer init mandatory for all programs, rendered this store obsolete by removing the early-return path for static programs with no TLS.
* make __init_tp function static when static linkingRich Felker2015-04-231-0/+3
| | | | | | | | this slightly reduces the code size cost of TLS/thread-pointer for static linking since __init_tp can be inlined into its only caller and removed. this is analogous to the handling of __init_libc in __libc_start_main, where the function only has external linkage when it needs to be called from the dynamic linker.
* add dependency of dlstart.lo on crt_arch.h to MakefileRich Felker2015-04-231-1/+1
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* fix regression in x86_64 math asm with old binutilsRich Felker2015-04-232-6/+6
| | | | | | | | | the implicit-operand form of fucomip is rejected by binutils 2.19 and perhaps other versions still in use. writing both operands explicitly fixes the issue. there is no change to the resulting output. commit a732e80d33b4fd6f510f7cec4f5573ef5d89bc4e was the source of this regression.
* fix syntax errors in configure scriptRich Felker2015-04-221-2/+2
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* minor optimization to pthread_spin_trylockRich Felker2015-04-222-2/+4
| | | | | | use CAS instead of swap since it's lighter for most archs, and keep EBUSY in the lock value so that the old value obtained by CAS can be used directly as the return value for pthread_spin_trylock.
* optimize spin lock not to dirty cache line while spinningRich Felker2015-04-221-1/+1
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* in visibility preinclude, remove overrides for stdin/stdout/stderrRich Felker2015-04-221-3/+0
| | | | | | | | | | | | the motivation for this change is that the extra declaration (with or without visibility) using "struct _IO_FILE" instead of "FILE" seems to trigger a bug in gcc 3.x where it considers the types mismatched. however, this change also results in slightly better code and it is valid because (1) these three objects are constant, and (2) applying the & operator to any of them is invalid C, since they are not even specified to be objects. thus it does not matter if the application and libc see different addresses for them, as long as the (initial, unchanging) value is seen the same by both.
* fix inconsistent visibility for __hwcap and __sysinfo symbolsRich Felker2015-04-222-5/+3
| | | | | these are used as hidden by asm files (and such use is the whole reason they exist), but their actual definitions were not hidden.
* remove additional libc struct accessor cruftRich Felker2015-04-221-12/+0
| | | | | commit f9cccfc16e58b39ee381fbdfb8688db3bb8e3555 left behind the part in libc.c; remove it too.
* remove useless visibility application from static-linking-only codeRich Felker2015-04-222-3/+2
| | | | | part of the goal here is to eliminate use of the ATTR_LIBC_VISIBILITY macro outside of libc.h, since it was never intended to be 'public'.
* remove libc.h dependency from otherwise-independent multibyte codeRich Felker2015-04-221-2/+4
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* remove cruft for libc struct accessor function and broken visibilityRich Felker2015-04-222-18/+0
| | | | | | | | | these were hacks to work around toolchains that could not properly optimize PIC accesses based on visibility and would generate GOT lookups even for hidden data, which broke the old dynamic linker. since commit f3ddd173806fd5c60b3f034528ca24542aecc5b9 it no longer matters; the dynamic linker does not assume accessibility of this data until stage 3.
* make configure check for visibility preinclude compatible with pccRich Felker2015-04-221-3/+3
| | | | | | | | | | | | | pcc does not search for -include relative to the working directory unless -I. is used. rather than adding -I., which could be problematic if there's extra junk in the top-level directory, switch back to the old method (reverting commit 60ed988fd6c67b489d7cc186ecaa9db4e5c25b8c) of using -include vis.h and relying on -I./src/internal being present on the command line (which the Makefile guarantees). to fix the breakage that was present in trycppif checks with the old method, $CFLAGS_AUTO is removed from the command line passed to trycppif; this is valid since $CFLAGS_AUTO should not contain options that alter compiler semantics or ABI, only optimizations, warnings, etc.
* fix duplocale clobbering of new locale struct with memcpy of oldRich Felker2015-04-211-1/+2
| | | | | | | | | | | | | | | when the non-stub duplocale code was added as part of the locale framework in commit 0bc03091bb674ebb9fa6fe69e4aec1da3ac484f2, the old code to memcpy the old locale object to the new one was left behind. the conditional for the memcpy no longer makes sense, because the conditions are now always-true when it's reached, and the memcpy is wrong because it clobbers the new->messages_name pointer setup just above. since the messages_name and ctype_utf8 members have already been copied, all that remains is the cat[] array. these pointers are volatile, so using memcpy to copy them is formally wrong; use a for loop instead.
* configure: check for -march and -mtune passed via CCAndre McCurdy2015-04-211-2/+4
| | | | | | | | Some build environments pass -march and -mtune as part of CC, therefore update configure to check both CC and CFLAGS before making the decision to fall back to generic -march and -mtune options for x86. Signed-off-by: Andre McCurdy <armccurdy@gmail.com>
* remove dead case for F_SETLKW in fcntlRich Felker2015-04-211-1/+0
| | | | | | the first switch already returns in the F_SETLKW code path so it need not be handled in the second switch. moreover the code in the second switch is wrong for the F_SETLKW command: it's not cancellable.
* fix mmap leak in sem_open failure path for link callRich Felker2015-04-211-0/+1
| | | | | | | the leak was found by static analysis (reported by Alexander Monakov), not tested/observed, but seems to have occured both when failing due to O_EXCL, and in a race condition with O_CREAT but not O_EXCL where a semaphore by the same name was created concurrently.
* remove always-true conditional in dynamic linker TLSDESC processingRich Felker2015-04-211-1/+1
| | | | | | the allocating path which can fail is for dynamic TLS, which can only occur at runtime, and the check for runtime was already made in the outer conditional.
* remove redundant code in do_dlsym functionRich Felker2015-04-211-1/+1
| | | | | | | commit 637dd2d383cc1f63bf02a732f03786857b22c7bd introduced the checks for RTLD_DEFAULT and RTLD_NEXT here, claiming they fixed a regression, but the above conditional block clearly already covered these cases, and removing the checks produces no difference in the generated code.
* fix breakage in x32 dynamic linker due to mismatching register sizeRich Felker2015-04-201-1/+1
| | | | | | the jmp instruction requires a 64-bit register, so cast the desired PC address up to uint64_t, going through uintptr_t to ensure that it's zero-extended rather than possibly sign-extended.
* fix regression in configure script with new visibility optionRich Felker2015-04-201-3/+3
| | | | | | | | | commit de2b67f8d41e08caa56bf6540277f6561edb647f introduced a regression by adding a -include option to CFLAGS_AUTO which did not work without additional -I options. this broke subsequent trycppif tests and caused x86_64 to be misdetected as x32, among other issues. simply using the full relative pathname to vis.h rather than -I is the cleanest way to fix the problem.
* add optional global visibility overrideRich Felker2015-04-193-1/+72
| | | | | | | | | | | | this is implemented via the build system and does not affect source files. the idea is to use protected or hidden visibility to prevent the compiler from pessimizing function calls within a shared (or position-independent static) libc in the form of overhead setting up for a call through the PLT. the ld-time symbol binding via the -Bsymbolic-functions option already optimized out the PLT itself, but not the code in the caller needed to support a call through the PLT. on some archs this overhead can be substantial; on others it's trivial.
* remove invalid PLT calls from or1k asmRich Felker2015-04-192-3/+7
| | | | analogous to commit 646cb9a4a04e5ed78e2dd928bf9dc6e79202f609 for sh.
* remove possible-textrels from powerpc asmRich Felker2015-04-192-2/+6
| | | | | | | these are perfectly fine with ld-time symbol binding, but otherwise result in textrels. they cannot be replaced with @PLT jump targets because the PLT thunks require a GOT register to be setup, so use a hidden alias instead.
* remove invalid PLT calls from microblaze asmRich Felker2015-04-192-2/+6
| | | | analogous to commit 646cb9a4a04e5ed78e2dd928bf9dc6e79202f609 for sh.
* remove invalid PLT calls from sh asmRich Felker2015-04-192-2/+6
| | | | | | these are perfectly fine with ld-time symbol binding, but if the calls go through a PLT thunk, they are invalid because the caller does not setup a GOT register. use a hidden alias to bypass the issue.
* remove potentially PIC-incompatible relocations from x86_64 and x32 asmRich Felker2015-04-186-7/+11
| | | | analogous to commit 8ed66ecbcba1dd0f899f22b534aac92a282f42d5 for i386.
* remove the last of possible-textrels from i386 asmRich Felker2015-04-186-4/+16
| | | | | | | | | | | | none of these are actual textrels because of ld-time binding performed by -Bsymbolic-functions, but I'm changing them with the goal of making ld-time binding purely an optimization rather than relying on it for semantic purposes. in the case of memmove's call to memcpy, making it explicit that the memmove asm is assuming the forward-copying behavior of the memcpy asm is desirable anyway; in case memcpy is ever changed, the semantic mismatch would be apparent while editing memmcpy.s.
* make dlerror state and message thread-local and dynamically-allocatedRich Felker2015-04-183-32/+65
| | | | | | | | | this fixes truncation of error messages containing long pathnames or symbol names. the dlerror state was previously required by POSIX to be global. the resolution of bug 97 relaxed the requirements to allow thread-safe implementations of dlerror with thread-local state and message buffer.
* add missing 'void' in prototypes of internal pthread functionsAlexander Monakov2015-04-181-6/+6
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