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* - Define LDBL_NBIT to be a mask indicating the position of the integerdas2005-03-071-2/+10
| | | | | | | | | bit in a long double. For architectures that don't have such a bit, LDBL_NBIT is 0. This makes it possible to say `mantissa & ~LDBL_NBIT' in places that previously used an #ifdef to select the right expression. The optimizer should dispense with the extra arithmetic when LDBL_NBIT is 0 anyway. - Add an XXX comment for the big endian case.
* Update my email address.das2005-02-061-1/+1
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* Replace the ldexp() implementation in libc with a renamed copy of thedas2005-01-221-137/+0
| | | | | | | | | | | | | | | | scalbn() implementation from libm. (The two functions are defined to be identical, but ldexp() lives in libc for backwards compatibility.) The old ldexp() implementation... - was more complicated than this one - set errno instead of raising FP exceptions - got some corner cases wrong (e.g. ldexp(1.0, 2000) in round-to-zero mode) The new implementation lives in libc/gen instead of libc/$MACHINE_ARCH/gen, since we don't need N copies of a machine-independent file. The amd64 and i386 platforms retain their fast and correct MD implementations and override this one.
* Eliminate gdtoa.mk and move its contents to ${MACHINE_ARCH}/Makefile.inc.das2005-01-152-5/+4
| | | | | The purpose of having a separate file involved an abandoned scheme that would have kept contrib/gdtoa out of the include path for the rest of libc.
* For variables that are only checked with defined(), don't provideru2004-10-241-1/+1
| | | | any fake value.
* Unbreak memmove(). Return the dst argument. While here, fix the ENDmarcel2004-09-041-7/+6
| | | | macro to actually reference memmove, not memcpy.
* Unbreak memcpy(). memcpy() is defined to return the dst argument.marcel2004-09-041-6/+5
| | | | | | By using r8 instead of r14 to do the swap, we put the dst argument in the return register. Since bcopy() doesn't clobber r8, we don't have to do anything else. This fixes ports/textproc/aspell.
* Make profiling actually work. The gcc compiler emits a call to themarcel2004-08-252-4/+79
| | | | | | | | | | | | | _mcount() stub when profiling is enabled. Emit this code sequence for assembly routines as welli (MCOUNT definition in <machine/asm.h>. We do not pass the GOT entry however as the 4th argument, because it's not used. The _mcount() stub calls __mcount(), which does the actual work. Define _MCOUNT_DECL to define __mcount. We do not have an implementation of mcount(), so we define MCOUNT as empty, but have a weak alias to _mcount() in _mcount.S. Note that the _mcount() stub in the kernel is slightly different from the stub in userland. This is because we do not have to worry about nested routines in the kernel.
* Add support for TLS in statically linked programs.dfr2004-08-152-1/+36
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* Make FLT_ROUNDS correctly reflect the dynamic rounding mode.das2004-07-192-1/+27
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* Replace seven nominally MD implementations of frexp() that are brokendas2004-07-182-57/+1
| | | | for subnormals with one implementation that works.
* Implement the classification macros isfinite(), isinf(), isnan(), anddas2004-07-092-70/+1
| | | | | | | | | | | | | | | | | | | | | isnormal() the hard way, rather than relying on fpclassify(). This is a lose in the sense that we need a total of 12 functions, but it is necessary for binary compatibility because we have never bumped libm's major version number. In particular, isinf(), isnan(), and isnanf() were BSD libc functions before they were C99 macros, so we can't reimplement them in terms of fpclassify() without adding a dependency on libc.so.5. I have tried to arrange things so that programs that could be compiled in FreeBSD 4.X will generate the same external references when compiled in 5.X. At the same time, the new macros should remain C99-compliant. The isinf() and isnan() functions remain in libc for historical reasons; however, I have moved the functions that implement the macros isfinite() and isnormal() to libm where they belong. Moreover, half a dozen MD versions of isinf() and isnan() have been replaced with MI versions that work equally well. Prodded by: kris
* Fix some aliasing problems.das2004-02-161-6/+14
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* style cleanup: Remove duplicate $FreeBSD$ tags.cperciva2004-02-102-4/+0
| | | | | | | | These files had tags after teh copyright notice, inside the comment block (incorrect, removed), and outside the comment block (correct). Approved by: rwatson (mentor)
* Define LDBL_MANH_SIZE and LDBL_MANL_SIZE to be the sizes of thedas2004-01-181-0/+3
| | | | high and low words of the mantissa in bits, respectively.
* Add required headers.nectar2004-01-062-0/+4
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* Virtual addresses in headers of ELF files for dynamic objects needmarcel2003-11-081-6/+9
| | | | to be relocated before they can be used as pointers.
* The FP status register allows for 6 traps to be masked. One of them,marcel2003-10-222-3/+3
| | | | | | | | | | | | the denormal/unnormal trap, is not a standard IEEE trap. We did not exclude it from being returned by fpgetmask(), nor did we make sure that fpsetmask() didn't clobber it. Since the non-IEEE trap is not part of fp_except_t, users of ifpgetmask()/fpsetmask() would be confronted with unexpected behaviour, one of which is a SIGFPE for denormal/unnormal FP results. This commit makes sure that we don't leak the denormal/unnormal mask bit in fp_except_t and also that we don't clobber it.
* Add the mlockall() and munlockall() system calls.bms2003-08-111-1/+1
| | | | | | | | | | | | | | | | | | | | | | | - All those diffs to syscalls.master for each architecture *are* necessary. This needed clarification; the stub code generation for mlockall() was disabled, which would prevent applications from linking to this API (suggested by mux) - Giant has been quoshed. It is no longer held by the code, as the required locking has been pushed down within vm_map.c. - Callers must specify VM_MAP_WIRE_HOLESOK or VM_MAP_WIRE_NOHOLES to express their intention explicitly. - Inspected at the vmstat, top and vm pager sysctl stats level. Paging-in activity is occurring correctly, using a test harness. - The RES size for a process may appear to be greater than its SIZE. This is believed to be due to mappings of the same shared library page being wired twice. Further exploration is needed. - Believed to back out of allocations and locks correctly (tested with WITNESS, MUTEX_PROFILING, INVARIANTS and DIAGNOSTIC). PR: kern/43426, standards/54223 Reviewed by: jake, alc Approved by: jake (mentor) MFC after: 2 weeks
* o There are 6 trap disable bits in ar.fpsr, not five. Even though wemarcel2003-08-092-4/+4
| | | | | | | | | | | | | didn't provide a constant for one of them (non-IEEE denormal trap), in an attempt to not support it probably, it's not we are left with the lower 5 bits. o Properly mask the passed or returned fp_except_t. Not doing so causes instant core dumps by trying to write an invalid value to ar.fpsr. Now that we're masking, stop using exclusive-or to invert bits. This fixes the illegal instruction fault encountered when building mozilla.
* Override the default stubs for getcontext(2) and swapcontext(2) somarcel2003-08-023-2/+80
| | | | | | | | | | | | | that we can flush the register stack prior to entering the kernel. This avoids having dirty registers and saves us from having to manually write them to the backing store from within the kernel. In that respect, flushing the RSE is both functionally required as well as performance optimal. On average we had 18 dirty registers when getcontext(2) was called from libthr. Since libthr does not switch back to a context created by getcontext(2), not having dealt with the dirty registers was harmless.
* The END() must expand to the .endp directive with the same name asmarcel2003-08-013-6/+5
| | | | | | | on the corresponding .proc directive, or the .endp must not have a name at all. While here, remove an artificial dependency in Ovfork.S by performing manual register renaming.
* Revert previous commit. We don't use setjmp()/longjmp() for contextmarcel2003-07-251-4/+2
| | | | | | switching anymore, so there's no need to save and restore GP. This change breaks threaded applications linked against libc_r. Pull the tier 2 card again: relink. This will link against libthr instead.
* Implement signalcontext(). Needed by libpthread (aka libkse).marcel2003-06-242-1/+123
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* o Fix a cut-n-paste bug. We were clobbering rp with gp...marcel2003-06-021-2/+2
| | | | | | o Make sure the arguments to ctx_wrapper() are loaded from the backing store by forcing an underflow. Do this by making all registers in the register frame local.
* Rough implement of makecontext() needed to support libthr.marcel2003-05-312-1/+122
| | | | | | | | | | | | | | o Up to 8 arguments are allowed. This is the number of arguments passed in registers. Subsequent registers are passed on the stack. Trying to deal with this is not easy in C and likely forces us to use assembly code. Let's avoid that for now. There's no indication that more than 8 arguments is a strong requirement (Linux also has an 8 argument limit). o We expect that the stack base is 16-byte aligned and the stack size is a multiple of 16-byte. We bomb out if this is not the case. We probably want to be less strict by enforcing it ourselves. For now it's better to not hide gross alignment bogons by silently correcting it.
* Revamp of the syscall path, exception and context handling. Themarcel2003-05-163-12/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | prime objectives are: o Implement a syscall path based on the epc inststruction (see sys/ia64/ia64/syscall.s). o Revisit the places were we need to save and restore registers and define those contexts in terms of the register sets (see sys/ia64/include/_regset.h). Secundairy objectives: o Remove the requirement to use contigmalloc for kernel stacks. o Better handling of the high FP registers for SMP systems. o Switch to the new cpu_switch() and cpu_throw() semantics. o Add a good unwinder to reconstruct contexts for the rare cases we need to (see sys/contrib/ia64/libuwx) Many files are affected by this change. Functionally it boils down to: o The EPC syscall doesn't preserve registers it does not need to preserve and places the arguments differently on the stack. This affects libc and truss. o The address of the kernel page directory (kptdir) had to be unstaticized for use by the nested TLB fault handler. The name has been changed to ia64_kptdir to avoid conflicts. The renaming affects libkvm. o The trapframe only contains the special registers and the scratch registers. For syscalls using the EPC syscall path no scratch registers are saved. This affects all places where the trapframe is accessed. Most notably the unaligned access handler, the signal delivery code and the debugger. o Context switching only partly saves the special registers and the preserved registers. This affects cpu_switch() and triggered the move to the new semantics, which additionally affects cpu_throw(). o The high FP registers are either in the PCB or on some CPU. context switching for them is done lazily. This affects trap(). o The mcontext has room for all registers, but not all of them have to be defined in all cases. This mostly affects signal delivery code now. The *context syscalls are as of yet still unimplemented. Many details went into the removal of the requirement to use contigmalloc for kernel stacks. The details are mostly CPU specific and limited to exception_save() and exception_restore(). The few places where we create, destroy or switch stacks were mostly simplified by not having to construct physical addresses and additionally saving the virtual addresses for later use. Besides more efficient context saving and restoring, which of course yields a noticable speedup, this also fixes the dreaded SMP bootup problem as a side-effect. The details of which are still not fully understood. This change includes all the necessary backward compatibility code to have it handle older userland binaries that use the break instruction for syscalls. Support for break-based syscalls has been pessimized in favor of a clean implementation. Due to the overall better performance of the kernel, this will still be notived as an improvement if it's noticed at all. Approved by: re@ (jhb)
* Add a comment describing why it's important for the values in thisdas2003-05-081-0/+7
| | | | | | file to be correct, and how to generate them automatically. Caused much pain and suffering for: peter
* Add __ldtoa(), a wrapper around gdtoa() to make it look like dtoa().das2003-04-051-0/+5
| | | | | | | In support of this, add some MD macros to assist in converting long doubles to the format expected by gdtoa(). Reviewed by: silence on standards@
* Replace our ancient dtoa/strtod implementation with the gdtoadas2003-03-122-0/+35
| | | | | | | | | | | | | | | | | | package, a more recent, generalized set of routines. Among the changes: - Declare strtof() and strtold() in stdlib.h. - Add glue to libc to support these routines for all kinds of ``long double''. - Update printf() to reflect the fact that dtoa works slightly differently now. As soon as I see that nothing has blown up, I will kill src/lib/libc/stdlib/strtod.c. Soon printf() will be able to use the new routines to output long doubles without loss of precision, but numerous bugs in the existing code must be addressed first. Reviewed by: bde (briefly), mike (mentor), obrien
* Fix threaded applications on ia64 that are linked dynamicly. We didmarcel2003-03-051-3/+5
| | | | | | | | | | | | | | | | | not save (restore) the global pointer (GP) in the jmpbuf in setjmp (longjmp) because it's not needed in general. GP is considered a scratch register at callsites and hence is always restored after a call (when it's possible that the call resolves to a symbol in a different loadmodule; otherwise GP does not have to be saved and restored at all), including calls to setjmp/longjmp. There's just one problem with this now that we use setjmp/longjmp for context switching: A new context must have GP defined properly for the thread's entry point. This means that we need to put GP in the jmpbuf and consequently that we have to restore is in longjmp. This automaticly requires us to save it as well. When setjmp/longjmp isn't used for context switching, this can be reverted again.
* ABI breaker: Move the J_SIGMASK field in the jmpbuf beforemarcel2003-03-051-2/+2
| | | | | | | | | | | the J_SIG0 field. While here, rename J_SIG0 to J_SIGSET and remove J_SIG1. The main reason for this change is that the 128-bit sigset_t is now aligned on a 16-byte boundary, which allows us to use 16-byte atomic loads and stores on CPUs that support it. The removal of J_SIG1 is done to avoid confusion: it is never accessed and should not be. Renaming J_SIG0 to J_SIGSET is the icing on the cake that's better done now than later.
* Use __FBSDID.obrien2003-03-0335-44/+85
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* ia64 actually uses 80-bit long doubles and must support big and littlemike2003-02-262-3/+27
| | | | | | endian at compile-time. Reviewed by: das
* o Implement C99 classification macros isfinite(), isinf(), isnan(),mike2003-02-121-0/+5
| | | | | | | | | isnormal(). The current isinf() and isnan() are perserved for binary compatibility with 5.0, but new programs will use the macros. o Implement C99 comparison macros isgreater(), isgreaterequal(), isless(), islessequal(), islessgreater(), isunordered(). Submitted by: David Schultz <dschultz@uclink.Berkeley.EDU>
* Implement fpclassify():mike2003-02-082-0/+43
| | | | | | | | | | | | | | | | | | | | | | | | | | | o Add a MD header private to libc called _fpmath.h; this header contains bitfield layouts of MD floating-point types. o Add a MI header private to libc called fpmath.h; this header contains bitfield layouts of MI floating-point types. o Add private libc variables to lib/libc/$arch/gen/infinity.c for storing NaN values. o Add __double_t and __float_t to <machine/_types.h>, and provide double_t and float_t typedefs in <math.h>. o Add some C99 manifest constants (FP_ILOGB0, FP_ILOGBNAN, HUGE_VALF, HUGE_VALL, INFINITY, NAN, and return values for fpclassify()) to <math.h> and others (FLT_EVAL_METHOD, DECIMAL_DIG) to <float.h> via <machine/float.h>. o Add C99 macro fpclassify() which calls __fpclassify{d,f,l}() based on the size of its argument. __fpclassifyl() is never called on alpha because (sizeof(long double) == sizeof(double)), which is good since __fpclassifyl() can't deal with such a small `long double'. This was developed by David Schultz and myself with input from bde and fenner. PR: 23103 Submitted by: David Schultz <dschultz@uclink.Berkeley.EDU> (significant portions) Reviewed by: bde, fenner (earlier versions)
* Implement missing fpgetround() and fpsetround().marcel2003-01-113-2/+84
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* Correct typos, mostly s/ a / an / where appropriate. Some whitespace cleanup,schweikh2003-01-012-2/+2
| | | | especially in troff files.
* Sort SRCS.marcel2002-11-161-5/+4
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* o Fix _longjmp() to return 1 when the return value is given as 0.marcel2002-11-141-52/+25
| | | | | | | | | | | | | o Remove the unwanted smartness in _longjmp() where it compares the current ar.bspstore with the saved ar.bspstore and restores ar.rnat based on it. This either avoids saving ar.rnat in the jmp_buf or is the consequence of not saving ar.rnat. All this complexity breaks libc_r where we use longjmp() to switch to different threads and the current ar.bspstore has no relation to the saved ar.bspstore. Thus: we save ar.rnat in setjmp() and simply restore ar.bspstore and ar.rnat in longjmp(). This code needs a cleanup.
* ia64 ABI breaker:marcel2002-11-113-38/+6
| | | | | | | | | | | | | Don't force 16-byte alignment at run-time. Do it at compile-time. This saves us the pointer fiddling by the setjmp functions and reduces complexity. While here, increase the jmp_buf by 16 bytes to an even 512 bytes. Coincidentally, due to the way alignment was handled prior to this change, the jmp_buf has not changed in size, but only in how the space is used. Prior to this change the 16 bytes were reserved for enforcing alignment; now they are reserved by us for future extensions. Therefore, this ABI breaker is relatively save: the failure is always an alignment trap.
* Re-apply the previously backed-out commit that fixes the problem wherearchie2002-10-311-1/+1
| | | | | | | | HUGE_VAL is not properly aligned on some architectures. The previous fix now works because the two versions of 'math.h' (include/math.h and lib/msun/src/math.h) have since been merged into one. PR: bin/43544
* Revert previous commit to unbreak world until we figure out thearchie2002-09-201-1/+1
| | | | right way to do it.
* Fix a problem with the definition of HUGE_VAL causing the gcc warningarchie2002-09-191-1/+1
| | | | | | "cast increases required alignment of target type" on some platforms. Reviewed by: bde
* We cannot use an alloc with only inputs and/or locals. The kernelmarcel2002-08-231-11/+16
| | | | | | assumes that the parameters are passed in output registers. Remove the alloc entirely, but don't depend on the kernel not trashing our registers.
* Generate the normal asm stubs for all sysv system calls. Use these insteadjake2002-05-231-5/+3
| | | | | | | of C wrappers for the *sys indirect system calls. The indirect system calls are horribly broken on sparc64. Submitted by: tmm
* Our default syscall.S is identical to what was explicitly being done forobrien2002-05-152-34/+1
| | | | Alpha and IA-64. So there is no need for special handling.
* Implement _Unwind_FindTableEntry(). This function is part of GCCmarcel2002-04-132-0/+130
| | | | | for some configurations, but not for FreeBSD (yet?). Have one in libc in the mean time.
* Fix the style of the SCM ID's.obrien2002-03-221-2/+3
| | | | I believe have made all of libc .h's as consistent as possible.
* Fix the style of the SCM ID's.obrien2002-03-227-9/+21
| | | | I believe have made all of libc .c's as consistent as possible.
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