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* MFC r304928:kib2016-09-032-58/+1
| | | | | | | | | | | | | Do not obliterate errno value in the main thread during ptrace(2) call on x86. MFC r304931: Follow ABI when calling __error from the ptrace(2) wrapper. MFC r305012: Rewrite ptrace(2) wrappers in C. MFC r305022: Restore the requirement of setting errno to zero before calling ptrace(2).
* MFC r285240:trasz2016-01-122-46/+1
| | | | | | | Remove reboot.S (part of libc). It's not needed and was actually broken - returning 0 from reboot(2) resulted in SIGBUS. Sponsored by: The FreeBSD Foundation
* MFC r287292:kib2015-09-052-40/+4
| | | | | | | | | | Switch libc from using _sig{procmask,action,suspend} symbols, which are aliases for the syscall stubs and are plt-interposed, to the libc-private aliases of internally interposed sigprocmask() etc. MFC r287300: Use libthr interposed functions instead of syscalls, in posix_spawn()' child.
* libc: Access _logname_valid more efficiently.jilles2013-08-171-8/+1
| | | | | | | | | | | 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.
* The getcontext() from the __fillcontextx() call in thekib2013-05-281-3/+13
| | | | | | | | | | | | | | | | | | | | | | | | | check_deferred_signal() returns twice, since handle_signal() emulates the return from the normal signal handler by sigreturn(2)ing the passed context. Second return is performed on the destroyed stack frame, because __fillcontextx() has already returned. This causes undefined and bad behaviour, usually the victim thread gets SIGSEGV. Avoid nested frame and the need to return from it by doing direct call to getcontext() in the check_deferred_signal() and using a new private libc helper __fillcontextx2() to complement the context with the extended CPU state if the deferred signal is still present. The __fillcontextx() is now unused, but is kept to allow older libthr.so to be used with the new libc. Mark __fillcontextx() as returning twice [1]. Reported by: pgj Pointy hat to: kib Discussed with: dim Tested by: pgj, dim Suggested by: jilles [1] MFC after: 1 week
* - Correct mispellings of the word occurrencegabor2013-04-173-5/+5
| | | | Submitted by: Christoph Mallon <christoph.mallon@gmx.de> (via private mail)
* Rework the __vdso_* symbols attributes to only make the symbols weak,kib2013-01-301-0/+10
| | | | | | | | | | 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
* libc/i386: Do not export .cerror.jilles2012-09-0511-41/+19
| | | | | | | | | | | | | | | | | | | | | | | 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. Not exporting .cerror causes it to be jumped to directly instead of via the PLT. This change also takes advantage of .cerror's new status by not saving and loading %ebx before jumping to it. (Therefore, .cerror now saves and loads %ebx itself.) Where there was a conditional jump to a jump to .cerror, the conditional jump has been changed to jump to .cerror directly (many modern CPUs don't do static prediction and in any case it is not much of a benefit anyway). This change makes libc.so.7 a few kilobytes smaller. Reviewed by: kib
* Executing CPUID with EAX set to 1 to actually get feature flags.davidxu2012-07-101-1/+1
| | | | PR: 169730
* Use struct vdso_timehands data to implement fast gettimeofday(2) andkib2012-06-222-1/+52
| | | | | | | | | | | | | | | 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
* mdoc: sort prologue macros.joel2012-03-263-3/+3
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* Make the sys/ucontext.h self-contained by changing the return typekib2012-02-011-1/+1
| | | | | | | of __getcontextx_size(3) from size_t to int. PR: ports/164654 MFC after: 1 month
* Add API for obtaining extended machine context states that cannot bekib2012-01-212-1/+134
| | | | | | | | | | | fit into existing mcontext_t. On i386 and amd64 do return the extended FPU states using getcontextx(3). For other architectures, getcontextx(3) returns the same information as getcontext(2). Tested by: pho MFC after: 1 month
* Change index() and rindex() to a weak alias.ed2012-01-052-2/+2
| | | | | | | | This allows people to still write statically linked applications that call strchr() or strrchr() and have a local variable or function called index. Discussed with: bde@
* Merge index() and strchr() together.ed2012-01-035-137/+7
| | | | | | | | | | | | | | | | | As I looked through the C library, I noticed the FreeBSD MIPS port has a hand-written version of index(). This is nice, if it weren't for the fact that most applications call strchr() instead. Also, on the other architectures index() and strchr() are identical, meaning we have two identical pieces of code in the C library and statically linked applications. Solve this by naming the actual file strchr.[cS] and let it use __strong_reference()/STRONG_ALIAS() to provide the index() routine. Do the same for rindex()/strrchr(). This seems to make the C libraries and static binaries slightly smaller, but this reduction in size seems negligible.
* Despite official i386 ABI does not mandate any stack alignment besideskib2011-11-022-0/+28
| | | | | | | | the word alignment, some versions of gcc do require 16-byte alignment. Make sure the stack is 16-byte aligned before calling a subroutine. Inspired by: PR amd64/162214 MFC after: 1 week
* Replace a proliferation of buggy MD implementations of modf() with adas2011-10-213-89/+1
| | | | | | | working MI one. The MI one only needs to be overridden on machines with non-IEEE754 arithmetic. (The last supported one was the VAX.) It can also be overridden if someone comes up with a faster one that actually passes the regression tests -- but this is harder than it sounds.
* Remove duplicate .note.GNU-stack section declaration. bcopy alreadykib2011-02-042-4/+0
| | | | | | made the neccessary provisions. Reported by: arundel
* Add section .note.GNU-stack for assembly files used by 386 and amd64.kib2011-01-0743-0/+85
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* libc: Remove the i386 assembler version of strlen(3).jilles2010-10-012-55/+1
| | | | | | | | | | | | | On anything modern, the C version, which processes a word at a time, is much faster. The Intel optimization manual explicitly warns against using REP prefixes with SCAS or CMPS, which is exactly what the assembler version does. A simple test on a Phenom II showed the C version, compiled with -O2, to be about twice as fast determining the length of 100000 strings between 0 and 255 bytes long. MFC after: 2 weeks
* Retire the amd64 and i386 specific inline assembly versions of ldexp.c,dim2010-09-301-68/+0
| | | | | | | | as they are slower than the generic version in C, at least on modern hardware. This leaves us with just five implementations. Suggested by: bde Approved by: rpaulo (mentor)
* Workaround LLVM bug #4434:rpaulo2010-09-211-3/+7
| | | | | | | | | | Reorder inline assembly arguments temp2, temp, value and texp to follow the st(0), st(1), etc. style. Also mark the temp2 variable as volatile to workaround another clang bug. This allows clang to buildworld FreeBSD/i386. Submitted by: dim
* Remove hand-written labs/abs implementations. GCC is smart enough.ed2009-06-233-95/+1
| | | | | | | It turns out GCC generates code that's a couple of bytes big bigger, but performs no branching whatsoever. Submitted by: Christoph Mallon
* Remove unneeded stores back into the function arguments.ed2009-06-222-4/+0
| | | | Submitted by: Christoph Mallon
* Unconditionally build wrappers for i386_get_ioperm(), i386_set_ioperm(),kib2009-04-011-4/+3
| | | | | | | i386_get_ldt() and i386_set_ldt(). In collaboration with: pho Reviewed by: jhb
* On i386, the primary function that SYSCALL() generates is with thepeter2008-11-153-3/+3
| | | | | __sys_ prefix. Make END() match. This didn't cause a compile error, but the function size is attached to the .weak symbol, not the real one.
* Mark uname(), getdomainname() and setdomainname() with COMPAT_FREEBSD4.ed2008-11-091-2/+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
* Add missing END() macros, as per rev 184547 for amd64. The lack of thesepeter2008-11-0243-4/+59
| | | | is mostly harmless, but it does upset some of valgrind's functionality.
* We should also save and restore the MXCSR as on amd64, but detectingdas2008-06-282-2/+0
| | | | whether the CPU supports SSE or not here is rather odious.
* Add an alternative view of the bits in an 80-bit long double (64+16bde2008-01-171-1/+6
| | | | | | | | | | | | | | | | | | | | instead of 32+32+15+1) on all arches that have such long doubles (amd64, ia64 and i386). Large objects should be be accessed in large units, and the 32+32+15+1[+padding] decomposition asks for almost the opposite of that, sometimes resulting in very slow accesses depending on how well the compiler ignores what we ask for and converts to the best units for the given machine. E.g., on Athlons, there is a 10-20 cycle penalty for accessing the middle 32-bit word immediately after an 80-bit store. Whether actually using the alternative view is better is very machine- dependent. A 32+32+16 view is probably best with old 32-bit systems and gcc through 4.2.1. The compiler should mostly avoid the view and generate best accesses, but gcc-4.2.1 is far from doing that. I think 64+16 is best for now. Similarly for doubles -- they should be using 64+0 especially on 64-bit machines, but fdlibm uses 32+32 extensively for them. Fortunately, in 64-bit mode for doubles, gcc already ignores the 32+32-bit view and generates best accesses in many cases.
* Since nan() is supposed to work the same as strtod("nan(...)", NULL),das2007-12-181-3/+0
| | | | | | | | | | | | my original implementation made both use the same code. Unfortunately, this meant libm depended on a vendor header at compile time and previously- unexposed vendor bits in libc at runtime. Hence, I just wrote my own version of the relevant vendor routine. As it turns out, mine has a factor of 8 fewer of lines of code, and is a bit more readable anyway. The strtod() and *scanf() routines still use vendor code. Reviewed by: bde
* Export gdtoa's __ULto{x,Q}_D2A routine in a private namespace sodas2007-12-161-0/+3
| | | | libm can use it.
* Arrange so that the NaN returned by strtod("nan", NULL) is the same asdas2007-12-161-4/+4
| | | | the NaN returned by strtod("nan()", NULL).
* In scanf, round according to the current rounding mode.das2007-12-031-1/+1
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* Classify mmap, lseek, pread, pwrite, truncate, ftruncate as pseudopeter2007-07-041-3/+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)
* Adjust the syscall stub macros to be consistent in their meaning. Inpeter2007-07-041-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | particular: SYSCALL() makes a syscall, with errno handling, and continues execution directly after the macro in the non-error case. RSYSCALL() is just like SYSCALL(), but returns after success. Both SYSCALL(name) and RSYSCALL(name) export "__sys_name" as a strong symbol, with "_name" and "name" as weak aliases. PSEUDO() is just like RSYSCALL(), but skipping the "name" weak alias. It still does "__sys_name" and "_name". Change i386 to add errno handling to PSEUDO. The same for amd64 and sparc64, with appear to have copied the behavior. ia64 was correct (as was alpha). Just remove some apparently unused variants of the macros. (untested!) I believe powerpc is correct. Fix arm to not export "name" from the PSEUDO case. Remove apparently extra unused variants. (untested!) The errno problem manifested on i386/amd64/sparc64 by having "PSEUDO" classified syscalls return without setting errno. eg: "addr = mmap()" could return with "addr" = 22 instead of setting errno to 22 and returning -1. Approved by: re (kensmith)
* Some libc symbol map cleanups.deischen2007-05-311-4/+0
| | | | | | | | | | | | | | | | | | | | | net: endhostdnsent is named _endhostdnsent and is private to netdb family of functions. posix1e: acl_size.c has been never compiled in, so there's no "acl_size". rpc: "getnetid" is a static function. stdtime: "gtime" is #ifdef'ed out in the source. some symbols are specific only to some architectures, e.g., ___tls_get_addr is only defined on i386. __htonl, __htons, __ntohl and __ntohs are no longer functions, they are now (internal) defines in <machine/endian.h>. Submitted by: ru
* Remove .mcount from gmon's Symbol map and add it to the appropriatedeischen2007-05-131-0/+1
| | | | | | | arch. It can be named differently depending on the arch (.mcount, _mcount). Submitted by: marius
* Use C comments since we now preprocess these files with CPP.deischen2007-04-291-9/+11
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* Clean-ip TLS symbol versions. [_]__tls_get_addr function is part ofkan2007-04-091-0/+1
| | | | | | | the platform ABI and as such does not belong in FBSDprivate. __libc_tls_* functions do not have to be visible to outside world at all.
* Per Regents of the University of Calfornia letter, remove advertisingimp2007-01-0923-91/+0
| | | | | | clause. # If I've done so improperly on a file, please let me know.
* Handle inf/nan correctly.das2007-01-061-2/+14
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* The distinction between quiet and signaling NaN formats isdas2007-01-031-0/+21
| | | | | machine-dependent; these files tell the latest version of gdtoa what to do.
* Instead of re-implementing hton[ls] and friends for each arch, add a new MIcognet2006-11-065-206/+0
| | | | | | | file, net/ntoh.c, which just implement them using the inline functions from <sys/endian.h>. Suggested by: bde
* Forgot to bump the document date.ru2006-10-131-1/+1
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* Some word smithing adopted from the PR.ru2006-10-131-14/+14
| | | | | | | PR: docs/54451 Originally by: Andreas Fuchs Adopted by: jhb MFC after: 3 days
* Markup fixes.ru2006-09-171-6/+6
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* GC dead code. If we want to stay polite to the foreign compilers,ru2006-09-052-63/+1
| | | | | | we can find another way to issue an #error, but using a preprocessed assembler for that purpose and clobbering libc.a with an empty .o just for the sake of #error reporting is way too much of a burden.
* Replace absolute addressing in the call instructions with position-independendkib2006-06-051-2/+3
| | | | | | | | calls. This eliminates TEXTREL from libc, making its text segment relocatable. PR: i386/85242 Approved by: kan (mentor) MFC after: 1 month
* A few minor wording changes and a clarification about error conditions.bsd2006-05-031-10/+10
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