Commit Graph

154 Commits

Author SHA1 Message Date
David Schultz
7b74e4a759 Remove fpsetsticky(). This was added for SysV compatibility, but due
to mistakes from day 1, it has always had semantics inconsistent with
SVR4 and its successors.  In particular, given argument M:

- On Solaris and FreeBSD/{alpha,sparc64}, it clobbers the old flags
  and *sets* the new flag word to M.  (NetBSD, too?)
- On FreeBSD/{amd64,i386}, it *clears* the flags that are specified in M
  and leaves the remaining flags unchanged (modulo a small bug on amd64.)
- On FreeBSD/ia64, it is not implemented.

There is no way to fix fpsetsticky() to DTRT for both old FreeBSD apps
and apps ported from other operating systems, so the best approach
seems to be to kill the function and fix any apps that break.  I
couldn't find any ports that use it, and any such ports would already
be broken on FreeBSD/ia64 and Linux anyway.

By the way, the routine has always been undocumented in FreeBSD,
except for an MLINK to a manpage that doesn't describe it.  This
manpage has stated since 5.3-RELEASE that the functions it describes
are deprecated, so that must mean that functions that it is *supposed*
to describe but doesn't are even *more* deprecated.  ;-)

Note that fpresetsticky() has been retained on FreeBSD/i386.  As far
as I can tell, no other operating systems or ports of FreeBSD
implement it, so there's nothing for it to be inconsistent with.

PR:		75862
Suggested by:	bde
2005-03-15 15:53:39 +00:00
David Schultz
1dfab5edec Define LDBL_NBIT to be a mask indicating the position of the integer
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.
2005-03-07 04:55:22 +00:00
David Schultz
f154b03b25 Update my email address. 2005-02-06 03:23:31 +00:00
David Schultz
bd15659f64 Eliminate gdtoa.mk and move its contents to ${MACHINE_ARCH}/Makefile.inc.
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.
2005-01-15 05:23:58 +00:00
Peter Wemm
66e1a311f5 Fix brk(3). The stack was unbalanced when we jumped to cerror. Oops!
This causes nasty things like SEGV or a cpu spin when we return.

Submitted by: "James R. Van Artsalen" <james@jrv.org>
2004-10-27 17:11:43 +00:00
Ruslan Ermilov
a35d88931c For variables that are only checked with defined(), don't provide
any fake value.
2004-10-24 15:33:08 +00:00
Doug Rabson
ccd13c49b5 Add support for TLS in statically linked programs. 2004-08-15 16:18:52 +00:00
David Xu
d3c6a920f1 1. Use correct alignment mask, -15 != ~15
2. Make end of frames
2004-07-31 01:41:41 +00:00
David Xu
0187c8ff4e Set fpu context flags to known values, zero is illegal. 2004-07-28 13:08:24 +00:00
David Schultz
479f8d2214 Make FLT_ROUNDS correctly reflect the dynamic rounding mode. 2004-07-19 08:17:25 +00:00
David Schultz
39bcea8689 Replace seven nominally MD implementations of frexp() that are broken
for subnormals with one implementation that works.
2004-07-18 21:23:39 +00:00
David Schultz
240dbabfa8 Implement the classification macros isfinite(), isinf(), isnan(), and
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
2004-07-09 03:32:40 +00:00
David Xu
2ff285bf2e Avoid to touch red zone, in libpthread, ucontext may be saved by kernel's
get_mcontext, and libpthread will use signalcontext to deliver signal in
userland, it looks same as kernel's send_sig does.

Reviewed by: deischen, tjr
2004-06-15 21:46:36 +00:00
Peter Wemm
3726033348 Fix Yet Another 16 byte stack alignment bug. Thankfully, this one is
solved by a simple 'make world'.  The signalcontext function was going
to the trouble of generating an even 16 byte alignment, but in fact it
needed to be odd aligned to simulate the 8-byte return address having
been pushed by the caller.  This fixes yet another group of crashes in
applications using libpthread.  And yet again, it was my fault all along.

While here, rename the duplicate internal ctx_wrapper() functions to
makectx_wrapper() and sigctx_wrapper() so that traces aren't ambiguous.
2004-03-31 07:27:31 +00:00
Peter Wemm
efbef97de9 Change the syscall stub branch orders so that the static branch prediction
will assume that syscalls will succeed rather than fail.
2004-02-22 02:11:39 +00:00
David Schultz
0f6da645e5 Fix a typo in the !__GNUC__ case and remove an obsolete comment. 2004-02-16 10:02:51 +00:00
David Schultz
36e22bed27 Fix some aliasing problems. 2004-02-16 10:02:40 +00:00
Peter Wemm
47ae38b543 Rewrite fabs.S to use pure SSE2 operations. I got the clues how to do
this from looking at code generated by gcc.
2004-02-08 21:21:45 +00:00
David Schultz
a8cb7cca02 Define LDBL_MANH_SIZE and LDBL_MANL_SIZE to be the sizes of the
high and low words of the mantissa in bits, respectively.
2004-01-18 07:57:02 +00:00
Jacques Vidrine
e4dc8baa84 Provide sysarch(2) prototypes in the MD sysarch.h headers. While I'm
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
2004-01-09 16:52:09 +00:00
Peter Wemm
04cb6b3aa6 "Fix" makecontext() so that the C code begins execution with its
ABI-required stack alignment.  C code expects that the push of the
return address disturbed the 16 byte alignment and it will take corrective
measures to fix it before making another call.  Of course, if its wrong
to start with, then all hell breaks loose.  Essentially we "fix" this
by making the stack alignment odd to start with.

This was one of the things that broke on libkse with apps that use
floating point/varargs/etc.

Approved by:  re (scottl)
2003-12-05 01:36:44 +00:00
Peter Wemm
d9484cc915 Add implementations of amd64_[gs]et_[fg]sbase(). 2003-10-23 06:07:09 +00:00
Alan Cox
44b0fd1cf6 Add rfork_thread(3). 2003-10-13 20:32:33 +00:00
Peter Wemm
ee9003796a Fix fabs(). This commit brought to you by the letter 'l'.
(fstp stores a mem32 value, fstpl stores a mem64 value)

This fixes ghostscript for 'make release' on amd64.  Ghostscript for some
reason thinks it is a good idea to use -fno-builtin, which means it is
vulnerable to bugs in libc that are normally hidden by the builtin gcc
functions.  Oops.
2003-09-26 01:49:48 +00:00
Peter Wemm
eda60a1613 Sigh. I can't win anything. Use addq rather than addl with %rsp. 2003-09-04 00:31:45 +00:00
Peter Wemm
294b146f2a Apply same basic fix for getcontext(2) as for i386. Store the return
value for getcontext() in a preserved register rather than on the stack.
The second time around, the stack value would likely have changed so we
can't depend on it for the return value.
2003-09-04 00:29:12 +00:00
Peter Wemm
c95f58c2f1 Fix some minor whitespace botches 2003-09-04 00:26:40 +00:00
Bruce M Simpson
abd498aa71 Add the mlockall() and munlockall() system calls.
- 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
2003-08-11 07:14:08 +00:00
David Xu
4160fed551 Set mc_len to sizeof(mcontext_t), otherwise it is an invalid context. 2003-07-26 12:58:28 +00:00
Peter Wemm
a1f8a9b1e8 Instantiate explicit callable versions of the machine/ieeefp.h inlines
for the use of non-GCC compilers and C++ code.
2003-07-22 06:46:17 +00:00
Peter Wemm
58452af3e5 Turn off the libc/quad functions since they are not needed for amd64
and just cause lots of warnings.
2003-07-22 06:34:57 +00:00
Daniel Eischen
4adc354c34 Add amd64 versions of makecontext() and signalcontext() needed
for libkse (makecontext() is also needed for libthr).
These probably will need some tweaking.
2003-07-19 04:41:08 +00:00
Peter Wemm
70de0c73a5 This is unusable on amd64. Remove it before it causes more confusion.
It is only possible to do this on an ABI that has a compulsory frame
pointer, which the amd64 ABI does not.  Thus, it is only possible to
implement this as a compiler builtin.
2003-06-13 21:56:30 +00:00
David E. O'Brien
11f0fab4fa Use C99 compatible ASM statements.
(untested, but existing state breaks
http://triangle.rtp.freebsd.org/~des/tinderbox-CURRENT-amd64-amd64.brief)
2003-06-10 21:17:55 +00:00
Peter Wemm
3191d840e0 Cosmetic; record offsets used within jmpbuf 2003-06-02 22:37:53 +00:00
Peter Wemm
b8f8813c6e Fix sigsetjmp(). It helps if we do not try to save the old signal mask
to a random memory location.  Perl works a lot better with this.
2003-06-02 21:59:13 +00:00
Peter Wemm
b3aa27a531 Repair PIC mode. It seems I was a bit too excited about the
implications of native PC relative addressing.
2003-05-24 17:35:23 +00:00
Peter Wemm
6b22ec82bf Update ldexp.c for amd64. 2003-05-10 00:47:52 +00:00
David Schultz
b7412bf571 Add a comment describing why it's important for the values in this
file to be correct, and how to generate them automatically.

Caused much pain and suffering for:	peter
2003-05-08 13:50:44 +00:00
Peter Wemm
0b1bb81ae6 SIG_SETMASK is 3, not 1. Sigh. 2003-05-08 07:41:24 +00:00
Peter Wemm
7ef6516c60 Fix an embarresing transcription error from i386 to amd64. Put the arguments
to sigprocmask(2) int the correct order. *blush*.
For sigsetjmp(), match up the pushq/popq in the non-savemask case.
2003-05-08 06:25:03 +00:00
Peter Wemm
dffecce67c Tidy up modf.S and make it actually work. It wasn't extracting
the value out of ST(0) before copying it to %xmm0.  Also remove bogus stack
frame and work in the red zone.
2003-05-08 03:19:37 +00:00
Peter Wemm
74b0b3cfcb Fix typo, even though this is unused. 2003-05-08 00:02:47 +00:00
Peter Wemm
c48f718c25 Like ia64, amd64 has got a 16 byte sized and aligned 'long double'.
Obtained from:	re (blanket amd64)
2003-05-08 00:02:03 +00:00
Peter Wemm
cf2720dda4 Turn off alloca.S - it cannot possibly work like this since on AMD64, gcc
doesn't use stack frames.  It uses offsets relative to %rsp, not %rbp.  So
we cannot just change %rsp like this.

Approved by:	re (blanket amd64)
2003-05-07 23:49:24 +00:00
Peter Wemm
be78acdf64 Actually use the correct values for AMD64. It is a 64 bit platform,
configure gdtoa as such.
2003-05-07 23:48:05 +00:00
David E. O'Brien
d37f19f084 Convert the i386 alloca(3) to the x86-64 ISA.
Alignment hack from:	NetBSD
2003-05-01 16:04:38 +00:00
Peter Wemm
adcebdf45d Delete i386_* syscall wrappers and manpages. Rename Ovfork.S to vfork.S. 2003-04-30 18:17:07 +00:00
Peter Wemm
0191e03a4e Update for AMD64 after repocopy from i386/sys/*. This means:
- strip out the nasty PIC_PROLOGUE/EPILOGUE stuff, since we dont have
to lose a register in PIC mode anymore (we use %rip-relative addressing).
- update for C register argument passing conventions.
- convert 32 bit to 64 bit register sizes etc.
2003-04-30 18:16:33 +00:00
Peter Wemm
0b8d851ef7 I have no idea why the reboot(2) syscall wrapper ends with iret, but
update it to be iretq for completeness.
2003-04-30 18:14:44 +00:00