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* libc: Move per-arch sys/Makefile.inc to libsysBrooks Davis2024-02-051-7/+0
| | | | | | | | | | | | | | | libc/<arch>/sys/Makefile.inc -> libsys/<arch>/Makefile.sys. Require that libsys/<arch>/Makefile.sys exist. At least for current archtiectures, it's not possible for an architecture to not have and MD syscall bits. powerpcspe/Makefile.sys's structure means it had to be modified when moved so rename detection won't work, but it has trivial contents so the history is unimportant. Reviewed by: kib, emaste, imp Pull Request: https://github.com/freebsd/freebsd-src/pull/908
* libc: remove remaining x86 sys bits to libsysBrooks Davis2024-02-054-252/+0
| | | | | Reviewed by: kib, emaste, imp Pull Request: https://github.com/freebsd/freebsd-src/pull/908
* libsys: relocate implementations and manpagesBrooks Davis2024-02-053-148/+0
| | | | | | | | | Remove core system call implementations and documentation to lib/libsys and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>. Update paths to allow libc to find them in their new home. Reviewed by: kib, emaste, imp Pull Request: https://github.com/freebsd/freebsd-src/pull/908
* {amd64,i386}/SYS.h: add _SYSCALL and _SYSCALL_BODYBrooks Davis2023-12-182-4/+2
| | | | | | | | | | Add a _SYSCALL(name) which calls the SYS_name syscall. Use it to add a _SYSCALL_BODY() macro which invokes the syscall and calls cerror as required. Use the latter to implement PSEUDO() and RSYSCALL(). Reviewed by: imp, markj Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D43059
* libc: don't needlessly add vfork.o to NOASMBrooks Davis2023-12-061-3/+0
| | | | | | | | | | For architectures where vfork.S was named Ovfork.S this was needed, but it was always pointless here as an entry in either MDASM or NOASM is equivalent. Reviewed by: kib Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42914
* Remove never implemented sbrk and sstk syscallsBrooks Davis2023-12-041-1/+1
| | | | | | | | | | | | | Both system calls were stubs returning EOPNOTSUPP and libc did not provide _ or __sys_ prefixed symbols. The actual implementation of sbrk(2) is on top of the undocumented break(2) system call. Technically this is a change in ABI, but no non-contrived program ever called these syscalls. Reviewed by: kib, emaste Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D42872
* lib: Remove ancient SCCS tags.Warner Losh2023-11-272-6/+0
| | | | | | | | Remove ancient SCCS tags from the tree, automated scripting, with two minor fixup to keep things compiling. All the common forms in the tree were removed with a perl script. Sponsored by: Netflix
* libc/<arch>/sys/Makefile.inc: remove cruftBrooks Davis2023-11-151-2/+0
| | | | | | | | Remove stray blank lines left over from $FreeBSD$ removal as well as some CVS-era (perhaps pre-repocopy) version comments. Reviewed by: emaste Differential Revision: https://reviews.freebsd.org/D42611
* libc: Purge unneeded cdefs.hWarner Losh2023-11-014-4/+0
| | | | | | | | | These sys/cdefs.h are not needed. Purge them. They are mostly left-over from the $FreeBSD$ removal. A few in libc are still required for macros that cdefs.h defines. Keep those. Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D42385
* Remove $FreeBSD$: one-line sh patternWarner Losh2023-08-161-1/+0
| | | | Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/
* Remove $FreeBSD$: one-line .c patternWarner Losh2023-08-167-14/+0
| | | | Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/
* spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSDWarner Losh2023-05-124-4/+4
| | | | | | | | | The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch up to that fact and revert to their recommended match of BSD-2-Clause. Discussed with: pfg MFC After: 3 days Sponsored by: Netflix
* sys/param.h: Add _WANT_P_OSRELKonstantin Belousov2023-02-154-8/+4
| | | | | | | | | | | Use it instead of defining IN_RTLD by base sources that want P_OSREL_ defines in userspace, but are not rtld. This allows to remove abuse of IN_RTLD from userspace. Reviewed by: dchagin, markj, imp Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D38585
* libc/<arch>/sys/cerror.S: fix typoKonstantin Belousov2021-04-031-1/+1
| | | | | Sponsored by: The FreeBSD Foundation MFC after: 3 days
* Remove resolver_qual from DEFINE_IFUNC/DEFINE_UIFUNC macros.Konstantin Belousov2019-05-164-4/+4
| | | | | | | | | | | | | In all practical situations, the resolver visibility is static. Requested by: markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Approved by: so (emaste) Differential revision: https://reviews.freebsd.org/D20281 Notes: svn path=/head/; revision=347895
* Convert amd64_get/set_fs/gsbase to ifunc.Konstantin Belousov2018-10-307-143/+104
| | | | | | | | | | Note that this is the first use of ifuncs in our userspace. Sponsored by: The FreeBSD Foundation MFC after: 1 month Notes: svn path=/head/; revision=339898
* Reimplement brk() and sbrk() to avoid the use of _end.Mark Johnston2018-06-043-169/+2
| | | | | | | | | | | | | | | | | | | | | | | | | Previously, libc.so would initialize its notion of the break address using _end, a special symbol emitted by the static linker following the bss section. Compatibility issues between lld and ld.bfd could cause the wrong definition of _end (libc.so's definition rather than that of the executable) to be used, breaking the brk()/sbrk() interface. Avoid this problem and future interoperability issues by simply not relying on _end. Instead, modify the break() system call to return the kernel's view of the current break address, and have libc initialize its state using an extra syscall upon the first use of the interface. As a side effect, this appears to fix brk()/sbrk() usage in executables run with rtld direct exec, since the kernel and libc.so no longer maintain separate views of the process' break address. PR: 228574 Reviewed by: kib (previous version) MFC after: 2 months Differential Revision: https://reviews.freebsd.org/D15663 Notes: svn path=/head/; revision=334626
* Replace MD assembly exect() with a portable version.Brooks Davis2018-04-122-55/+1
| | | | | | | | | | | | | | | | | | | | | | | | | Originally, on the VAX exect() enable tracing once the new executable image was loaded. This was possible because tracing was controllable through user space code by setting the PSL_T flag. The following instruction is a system call that activated tracing (as all instructions do) by copying PSL_T to PSL_TP (trace pending). The first instruction of the new executable image would trigger a trace fault. This is not portable to all platforms and the behavior was replaced with ptrace(PT_TRACE_ME, ...) since FreeBSD forked off of the CSRG repository. Platforms either incorrectly call execve(), trigger trace faults inside the original executable, or do contain an implementation of this function. The exect() interfaces is deprecated or removed on NetBSD and OpenBSD. Submitted by: Ali Mashtizadeh <ali@mashtizadeh.com> Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D14989 Notes: svn path=/head/; revision=332443
* Remove caching from getlogin(2).Brooks Davis2018-04-062-54/+1
| | | | | | | | | | | | | | | | This caching has existed since the CSRG import, but serves no obvious purpose. Sure, setlogin() is called rarely, but calls to getlogin() should also be infrequent. The required invalidation was not implemented on aarch64, arm, mips, amd riscv so updates would never occur if getlogin() was called before setlogin(). Reported by: Ali Mashtizadeh <ali@mashtizadeh.com> Reviewed by: kib Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D14965 Notes: svn path=/head/; revision=332119
* Remove architecture specific sigreturn.S files.Brooks Davis2018-04-042-49/+1
| | | | | | | | | | | | | All of these files are identical (modulo license blocks and VCS IDs) to the files generated by lib/libc/sys/Makefile.inc and serve no purpose. Reported by: Ali Mashtizadeh <ali@mashtizadeh.com> Reviewed by: kib Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D14953 Notes: svn path=/head/; revision=332048
* libc: further adoption of SPDX licensing ID tags.Pedro F. Giffuni2017-11-254-0/+8
| | | | | | | | | | | | | | | Mainly focus on files that use BSD 2-Clause license, however the tool I was using mis-identified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Notes: svn path=/head/; revision=326193
* Optimize libc to get and set TLS using the RDFSBASE and RDGSBASEKonstantin Belousov2017-08-217-1/+155
| | | | | | | | | | | | | instructions, if supported both by CPU and kernel. Reviewed by: jhb (previous version) Tested by: pho (previous version) Sponsored by: The FreeBSD Foundation MFC after: 3 weeks Differential revision: https://reviews.freebsd.org/D12023 Notes: svn path=/head/; revision=322763
* Renumber copyright clause 4Warner Losh2017-02-287-7/+7
| | | | | | | | | | | | Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96 Notes: svn path=/head/; revision=314436
* Reduce duplicate NOASM and PSEUDO definitionsBrooks Davis2016-09-081-3/+1
| | | | | | | | | | | | | | | | The initial value of NOASM is nearly the same in all cases and the initial value of PSEUDO is the same in all cases so reduce duplication (and hopefully, future merge conflicts) by machine independent defaults. Also document the PSEUDO variable. Reviewed by: jhb, kib Obtained from: CheriBSD Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D7820 Notes: svn path=/head/; revision=305630
* Rewrite ptrace(2) wrappers in C.Konstantin Belousov2016-08-292-68/+1
| | | | | | | | | | | | | Besides removing hand-translation to assembler, this also adds missing wrappers for arm64 and risc-v. Reviewed by: emaste, jhb Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D7694 Notes: svn path=/head/; revision=305012
* Follow ABI when calling __error from the ptrace(2) wrapper.Konstantin Belousov2016-08-281-0/+10
| | | | | | | | | | | In particular, preserve syscall arguments on stack, since callee is not required to preserve arg-passing registers. Align stack. Sponsored by: The FreeBSD Foundation MFC after: 1 week Notes: svn path=/head/; revision=304931
* Do not obliterate errno value in the main thread during ptrace(2) call on x86.Konstantin Belousov2016-08-271-4/+6
| | | | | | | | | | | | | | | | | Since ptrace(2) syscall can return -1 for non-error situations, libc wrappers set errno to 0 before performing the syscall, as the service to the caller. On both i386 and amd64, the errno symbol was directly referenced, which only works correctly in single-threaded process. Change assembler wrappers for ptrace(2) to get current thread errno location by calling __error(). Allow __error interposing, as currently allowed in cerror(). Sponsored by: The FreeBSD Foundation MFC after: 1 week Notes: svn path=/head/; revision=304928
* Remove unusedd and obsolete openbsd_poll system call. (Phase 1)George V. Neville-Neil2016-08-181-1/+1
| | | | | | | | | Reported by: brooks Reviewed by: brooks,jhb Differential Revision: https://reviews.freebsd.org/D7548 Notes: svn path=/head/; revision=304395
* Implement userspace gettimeofday(2) with HPET timecounter.Konstantin Belousov2016-08-172-71/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Right now, userspace (fast) gettimeofday(2) on x86 only works for RDTSC. For older machines, like Core2, where RDTSC is not C2/C3 invariant, and which fall to HPET hardware, this means that the call has both the penalty of the syscall and of the uncached hw behind the QPI or PCIe connection to the sought bridge. Nothing can me done against the access latency, but the syscall overhead can be removed. System already provides mappable /dev/hpetX devices, which gives straight access to the HPET registers page. Add yet another algorithm to the x86 'vdso' timehands. Libc is updated to handle both RDTSC and HPET. For HPET, the index of the hpet device to mmap is passed from kernel to userspace, index might be changed and libc invalidates its mapping as needed. Remove cpu_fill_vdso_timehands() KPI, instead require that timecounters which can be used from userspace, to provide tc_fill_vdso_timehands{,32}() methods. Merge i386 and amd64 libc/<arch>/sys/__vdso_gettc.c into one source file in the new libc/x86/sys location. __vdso_gettc() internal interface is changed to move timecounter algorithm detection into the MD code. Measurements show that RDTSC even with the syscall overhead is faster than userspace HPET access. But still, userspace HPET is three-four times faster than syscall HPET on several Core2 and SandyBridge machines. Tested by: Howard Su <howard0su@gmail.com> Sponsored by: The FreeBSD Foundation MFC after: 1 month Differential revision: https://reviews.freebsd.org/D7473 Notes: svn path=/head/; revision=304285
* Replace use of the pipe(2) system call with pipe2(2) with a zero flagsBrooks Davis2016-06-222-54/+1
| | | | | | | | | | | | | | | | | | | value. This eliminates the need for machine dependant assembly wrappers for pipe(2). It also make passing an invalid address to pipe(2) return EFAULT rather than triggering a segfault. Document this behavior (which was already true for pipe2(2), but undocumented). Reviewed by: andrew Approved by: re (gjb) Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D6815 Notes: svn path=/head/; revision=302092
* libc/{i386,amd64}: Do not export .cerror when building WITHOUT_SYMVEREd Maste2016-03-081-0/+1
| | | | | | | | | | | | | | | | | | Further to r240152 (i386) and r240178 (amd64), hide the .cerror symbol so that it is not exported if symbol versioning is not in use. Without this change WITHOUT_SYMVER libc contains .text relocations for .cerror, as described in LLVM PR 26813 (http://llvm.org/pr26813). This is a no-op for the regular build as the symbol version script already controls .cerror visibility. PR: 207712 Submitted by: Rafael Espíndola Reviewed by: jilles, kib Differential Revision: https://reviews.freebsd.org/D5571 Notes: svn path=/head/; revision=296474
* Copy the fencing of the algorithm to do lock-less update and readingKonstantin Belousov2015-08-041-3/+13
| | | | | | | | | | | | | | | | | of the timehands, from the kern_tc.c implementation to vdso. Add comments giving hints where to look for the algorithm explanation. To compensate the removal of rmb() in userspace binuptime(), add explicit lfence instruction before rdtsc. On i386, add usual complications to detect SSE2 presence; assume that old CPUs which do not implement SSE2 also execute rdtsc almost in order. Reviewed by: alc, bde (previous version) Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Notes: svn path=/head/; revision=286284
* Remove reboot.S (part of libc). It's not needed and was actuallyEdward Tomasz Napierala2015-07-072-51/+1
| | | | | | | | | | broken - returning 0 from reboot(2) resulted in SIGBUS. MFC after: 1 month Sponsored by: The FreeBSD Foundation Notes: svn path=/head/; revision=285240
* The lseek(2), mmap(2), truncate(2), ftruncate(2), pread(2), andKonstantin Belousov2015-04-181-3/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | pwrite(2) syscalls are wrapped to provide compatibility with pre-7.x kernels which required padding before the off_t parameter. The fcntl(2) contains compatibility code to handle kernels before the struct flock was changed during the 8.x CURRENT development. The shims were reasonable to allow easier revert to the older kernel at that time. Now, two or three major releases later, shims do not serve any purpose. Such old kernels cannot handle current libc, so revert the compatibility code. Make padded syscalls support conditional under the COMPAT6 config option. For COMPAT32, the syscalls were under COMPAT6 already. Remove WITHOUT_SYSCALL_COMPAT build option, which only purpose was to (partially) disable the removed shims. Reviewed by: jhb, imp (previous versions) Discussed with: peter Sponsored by: The FreeBSD Foundation MFC after: 1 week Notes: svn path=/head/; revision=281714
* Convert from WITHOUT_SYSCALL_COMPAT to MK_SYSCALL_COMPAT.Warner Losh2014-04-051-1/+1
| | | | Notes: svn path=/head/; revision=264155
* Introduce a WEAK_REFERENCE() alias and use it. Get rid of the CNAME and theAndreas Tobler2013-11-215-20/+10
| | | | | | | | | CONCAT macros in SYS.h. Reviewed by: bde, kib Notes: svn path=/head/; revision=258447
* libc: Access _logname_valid more efficiently.Jilles Tjoelker2013-08-171-5/+0
| | | | | | | | | | | | | | The variable _logname_valid is not exported via the version script; therefore, change C and i386/amd64 assembler code to remove indirection (which allowed interposition). This makes the code slightly smaller and faster. Also, remove #define PIC_GOT from i386/amd64 in !PIC mode. Without PIC, there is no place containing the address of each variable, so there is no possible definition for PIC_GOT. Notes: svn path=/head/; revision=254463
* Rework the __vdso_* symbols attributes to only make the symbols weak,Konstantin Belousov2013-01-301-0/+11
| | | | | | | | | | | | | but use normal references instead of weak. This makes the statically linked binaries to use fast gettimeofday(2) by forcing the linker to resolve references and providing the neccessary functions. Reported by: bde Tested by: marius (sparc64) MFC after: 2 weeks Notes: svn path=/head/; revision=246117
* libc/amd64: Do not export .cerror.Jilles Tjoelker2012-09-069-60/+5
| | | | | | | | | | | | | | | | | | | | For some reason, libc exports the symbol .cerror (HIDENAME(cerror)), albeit in the FBSDprivate_1.0 version. It looks like there is no reason for this since it is not used from other libraries. Given that it cannot be accessed from C and its strange calling convention, it is rather unlikely that other things rely on it. Perhaps it is from a time when symbols could not be hidden. Most of the amd64 assembler code jumps to .cerror using the GOT. It can jump to it directly now, as in non-PIC mode. There are also some minor size optimizations to instructions but they yield virtually no benefit in the size of libc.so.7 due to padding. Reviewed by: kib Notes: svn path=/head/; revision=240178
* Use struct vdso_timehands data to implement fast gettimeofday(2) andKonstantin Belousov2012-06-222-1/+51
| | | | | | | | | | | | | | | | | | clock_gettime(2) functions if supported. The speedup seen in microbenchmarks is in range 4x-7x depending on the hardware. Only amd64 and i386 architectures are supported. Libc uses rdtsc and kernel data to calculate current time, if enabled by kernel. Hopefully, this code is going to migrate into vdso in some future. Discussed with: bde Reviewed by: jhb Tested by: flo MFC after: 1 month Notes: svn path=/head/; revision=237434
* Add section .note.GNU-stack for assembly files used by 386 and amd64.Konstantin Belousov2011-01-0711-0/+21
| | | | Notes: svn path=/head/; revision=217106
* Mark uname(), getdomainname() and setdomainname() with COMPAT_FREEBSD4.Ed Schouten2008-11-091-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | Looking at our source code history, it seems the uname(), getdomainname() and setdomainname() system calls got deprecated somewhere after FreeBSD 1.1, but they have never been phased out properly. Because we don't have a COMPAT_FREEBSD1, just use COMPAT_FREEBSD4. Also fix the Linuxolator to build without the setdomainname() routine by just making it call userland_sysctl on kern.domainname. Also replace the setdomainname()'s implementation to use this approach, because we're duplicating code with sysctl_domainname(). I wasn't able to keep these three routines working in our COMPAT_FREEBSD32, because that would require yet another keyword for syscalls.master (COMPAT4+NOPROTO). Because this routine is probably unused already, this won't be a problem in practice. If it turns out to be a problem, we'll just restore this functionality. Reviewed by: rdivacky, kib Notes: svn path=/head/; revision=184789
* We've been lax about matching END() macros in asm code for some time. ThisPeter Wemm2008-11-029-0/+10
| | | | | | | | | | is used to set the ELF size attribute for functions. It isn't normally critical but some things can make use of it (gdb for stack traces). Valgrind needs it so I'm adding it in. The problem is present on all branches and on both i386 and amd64. Notes: svn path=/head/; revision=184547
* Classify mmap, lseek, pread, pwrite, truncate, ftruncate as pseudoPeter Wemm2007-07-041-3/+5
| | | | | | | | | | | | | syscalls, unless WITHOUT_SYSCALL_COMPAT is defined. The default case will have the .c wrappers still. If you define WITHOUT_SYSCALL_COMPAT, the .c wrappers will go away and libc will make direct syscalls. After 7-stable starts, the direct syscall method will be default. Approved by: re (kensmith) Notes: svn path=/head/; revision=171218
* Per Regents of the University of Calfornia letter, remove advertisingWarner Losh2007-01-0910-40/+0
| | | | | | | | | clause. # If I've done so improperly on a file, please let me know. Notes: svn path=/head/; revision=165903
* Do not try to store 64 bits into 32 bit errno variable. With the changed libcAlexander Kabaev2005-04-211-1/+1
| | | | | | | | data layout, this was corrupting _PathLocale variable leading to programs dumping core in non-default locales. Notes: svn path=/head/; revision=145356
* Fix brk(3). The stack was unbalanced when we jumped to cerror. Oops!Peter Wemm2004-10-271-0/+1
| | | | | | | | | This causes nasty things like SEGV or a cpu spin when we return. Submitted by: "James R. Van Artsalen" <james@jrv.org> Notes: svn path=/head/; revision=136994
* Change the syscall stub branch orders so that the static branch predictionPeter Wemm2004-02-223-3/+45
| | | | | | | will assume that syscalls will succeed rather than fail. Notes: svn path=/head/; revision=126107
* Provide sysarch(2) prototypes in the MD sysarch.h headers. While I'mJacques Vidrine2004-01-094-12/+4
| | | | | | | | | | | | | at it, use the ANSI C generic pointer type for the second argument, thus matching the documentation. Remove the now extraneous (and now conflicting) function declarations in various libc sources. Remove now unnecessary casts. Reviewed by: bde Notes: svn path=/head/; revision=124296
* Add implementations of amd64_[gs]et_[fg]sbase().Peter Wemm2003-10-235-0/+158
| | | | Notes: svn path=/head/; revision=121407
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