build frexp/ldexp/modf in the "compat" part (code is identical)
(These are the easy cases where no assembler implementations exist.)

Push back the descriptions of NaN formats, and descriptions of the
distinction between signalling NaNs and quiet NaNs back into the
machine-dependent headers; treat the implementation of __nanf in the
same spirit.

IEEE 754 leaves the distinction between signalling NaNs and quiet NANs
to the implementation, and unlike our headers used to suggest they're
not identical in the interpretation of the fraction's MSb; in due
course, make those of hppa, mips, sh3, and sh5 reflect reality.

branches: 1.13.2;
Add (missed) fabs.c to SRCS.

add missing FP functions, from openbsd.

added new files for context, LWP and siginfo support.

* Turn isinf(3) and isnan(3) into C99-style macros.
* Make it possible for ports to override these (i.e., VAX).
* Remove isnanl(), which was internal to libc only.

Add C99 fpclassify(), isfinite(), isnormal(), and signbit() macros.

It turns out the hppa ABI we're using does not support an extended-
precision type, so drop the library support for now but leave in place
(#ifdef _LP64) the header definitions.

Add __infinityf and __infinityl, float respectively long double analogs
of __infinity.

* Since there is no single portable IEEE 754 format for a long double,
keep a common implementation of isinfl() and isnanl() to be used by
platforms where `long double' == `double'; move others into
machine-dependent code.
* In due course, consider __VFP_FP__ on arm.

Build _isinfl() and _isnanl().

Rename ieee754_function.c to function_ieee754.c, following the convention
used in exec_format.c, loadfile_format.c, subsys_machdep.c etc.
Per discussion with Christos.

* Use the common ieee754_* routines (and add ones we were missing).
* Note that several routines are still missing for hppa.

Changes to allow libc to compile as PIC on the hppa.

Added hppa support (some of it incomplete) to lib/csu, lib/libc,
and lib/libkvm.

hppa longjmp: Use _UC_SIGMASK to restore signal mask.

This way, restoring the signal mask and restoring the stack pointer
happen atomically with respect to signal handler calls, whereas using
sigprocmask would restore the signal mask _before_ the stack pointer,
breaking sigaltstack.

The motivation for using sigprocmask first and then setcontext later,
rather than _UC_SIGMASK in setcontext, was to get SA-based libpthead
sigprocmask interposition. But that's long gone and unlikely to come
back.

Tested under qemu with:

atf-run /usr/tests/lib/libc/setjmp | atf-report
atf-run /usr/tests/lib/libpthread/t_siglongjmp | atf-report

PR lib/57946: longjmp fails to restore stack first before restoring
signal mask on most architectures

branches: 1.6.28;
use __register_t

Shut lint up about dp.

From he@

branches: 1.4.4; 1.4.8;
Remove clause 3 and 4 from TNF licenses

branches: 1.3.18;
__asm__ -> __asm, __volatile__ -> __volatile

Patterned after the other fixes for __longjmp14.c, include
<compat/include/setjmp.h> also here to make these build.

split __longjmp14() into a separate file and make it use setcontext()
instead of __sigreturn14(). translated from MIPS.

Remove some magic numbers by using genassym.cf

Add a space before any non-nullified instruction. NFCI.

Remove unnecesary #define/#undef _LOCORE

Even more trailing whitespace

No need to define PSW_MBS as machine/psl.h provides it for us

branches: 1.5.8; 1.5.46;
Remove clause 3 and 4 from TNF licenses

branches: 1.4.24;
split __longjmp14() into a separate file and make it use setcontext()
instead of __sigreturn14(). translated from MIPS.

Update to new assmbler needs. Add getcontext.S stub.

Changes to allow libc to compile as PIC on the hppa.

Added hppa support (some of it incomplete) to lib/csu, lib/libc,
and lib/libkvm.

branches: 1.2.8;
Remove clause 3 and 4 from TNF licenses

branches: 1.1.30;
Added hppa support (some of it incomplete) to lib/csu, lib/libc,
and lib/libkvm.

hppa _lwp_makecontext: Align stack pointer.

PR kern/59327: user stack pointer is not aligned properly

hppa _lwp_makecontext, makecontext: Sort includes.

No functional change intended.

PR kern/59327: user stack pointer is not aligned properly

branches: 1.5.56;
Allow storing and receiving the LWP private pointer via ucontext_t
on all platforms except VAX and IA64. Add fast access via register for
AMD64, i386 and SH3 ports. Use this fast access in libpthread to replace
the stack based pthread_self(). Implement skeleton support for Alpha,
HPPA, PowerPC, SPARC and SPARC64, but leave it disabled.

Ports that support this feature provide __HAVE____LWP_GETPRIVATE_FAST in
machine/types.h and a corresponding __lwp_getprivate_fast in
machine/mcontext.h.

This material is based upon work partially supported by
The NetBSD Foundation under a contract with Joerg Sonnenberger.

branches: 1.4.2;
Deal with PLABELs in _lwp_makecontext

branches: 1.3.8;
Remove clause 3 and 4 from TNF licenses

branches: 1.2.18;
Add missing __RCSID()

add *context and LWP support for hppa. translated from MIPS.

Pass PICFLAGS down to cc-as-as and use __PIC__ to decide if it is small
vs big PIC mode. Retire -DPIC and -DBIGPIC.

branches: 1.3.4; 1.3.8; 1.3.28;
Remove clause 3 and 4 from TNF licenses

branches: 1.2.6;
Fix include files and change use LEAF_ENTRY_NOPROFILE function to fix
the unwind entry.

branches: 1.1.16;
add *context and LWP support for hppa. translated from MIPS.

Remove magic numbers. NFCI.

Add a space before any non-nullified instruction. NFCI.

Remove unnecesary #define/#undef _LOCORE

branches: 1.4.8;
Remove clause 3 and 4 from TNF licenses

branches: 1.3.24;
call abort() if longjmperror() returns.

Update to new assmbler needs. Add getcontext.S stub.

Added hppa support (some of it incomplete) to lib/csu, lib/libc,
and lib/libkvm.

Try speling it rite, riasthradhdadhaa or whatever your name is.

On ports without __HAVE_LONG_DOUBLE, make fabsl alias fabs.

For some reason, fabs lives in libc, not in libm, and our tests now
detect when fabs or fabsl is missing from libm. For those ports that
sometimes have long double and sometimes don't, make it conditional.

Still missing: fabs _and_ fabsl on ia64. Need help from an itanium
wizard! Other portmasters: Please take a look and see if I missed
any ports that might have long double where this alias will not work.

branches: 1.4.84; 1.4.86;
oops. __volatile -> volatile

__asm__ -> __asm, __volatile__ -> __volatile

WARNS

add missing FP functions, from openbsd.

Shut lint up.

From he@

branches: 1.4.44;
oops. __volatile -> volatile

__asm__ -> __asm, __volatile__ -> __volatile

Add missing __RCSID()

add missing FP functions, from openbsd.

It turns out the hppa ABI we're using does not support an extended-
precision type, so drop the library support for now but leave in place
(#ifdef _LP64) the header definitions.

C99 7.12.3.1: add IEEE library portions of fpclassify. Don't build these
yet as the VAX implementation is still subject to discussion.

Shut lint up.

From he@

branches: 1.4.44;
oops. __volatile -> volatile

__asm__ -> __asm, __volatile__ -> __volatile

Add missing __RCSID()

add missing FP functions, from openbsd.

Shut lint up.

From he@

branches: 1.4.44;
oops. __volatile -> volatile

__asm__ -> __asm, __volatile__ -> __volatile

Add missing __RCSID()

add missing FP functions, from openbsd.

Shut lint up.

From he@

branches: 1.4.44;
oops. __volatile -> volatile

__asm__ -> __asm, __volatile__ -> __volatile

Add missing __RCSID()

add missing FP functions, from openbsd.

Shut lint up.

From he@

branches: 1.5.8;
Sprinkle the "memory" clobber register so the fpsr manipulation actually
happens.

Fixes the ieeefp/except regresion test.

branches: 1.4.26;
oops. __volatile -> volatile

__asm__ -> __asm, __volatile__ -> __volatile

Add missing __RCSID()

add missing FP functions, from openbsd.

Shut lint up.

From he@

branches: 1.5.8;
Sprinkle the "memory" clobber register so the fpsr manipulation actually
happens.

Fixes the ieeefp/except regresion test.

branches: 1.4.26;
oops. __volatile -> volatile

__asm__ -> __asm, __volatile__ -> __volatile

Add missing __RCSID()

add missing FP functions, from openbsd.

Shut lint up.

From he@

branches: 1.5.8;
Sprinkle the "memory" clobber register so the fpsr manipulation actually
happens.

Fixes the ieeefp/except regresion test.

branches: 1.4.26;
oops. __volatile -> volatile

__asm__ -> __asm, __volatile__ -> __volatile

Add missing __RCSID()

add missing FP functions, from openbsd.

* Use the common ieee754_* routines (and add ones we were missing).
* Note that several routines are still missing for hppa.

Added hppa support (some of it incomplete) to lib/csu, lib/libc,
and lib/libkvm.

It turns out the hppa ABI we're using does not support an extended-
precision type, so drop the library support for now but leave in place
(#ifdef _LP64) the header definitions.

Add __infinityf and __infinityl, float respectively long double analogs
of __infinity.

It turns out the hppa ABI we're using does not support an extended-
precision type, so drop the library support for now but leave in place
(#ifdef _LP64) the header definitions.

C99 7.12.3.2: add library portions of isfinite, but don't build these just
yet.

* Use the common ieee754_* routines (and add ones we were missing).
* Note that several routines are still missing for hppa.

Added hppa support (some of it incomplete) to lib/csu, lib/libc,
and lib/libkvm.

It turns out the hppa ABI we're using does not support an extended-
precision type, so drop the library support for now but leave in place
(#ifdef _LP64) the header definitions.

Err, rename some members added in previous to make them reflect their
semantics better.

Retire local union { floating-type; struct ieee_prec; } in favor of those
available from <machine/ieee.h>

* Since there is no single portable IEEE 754 format for a long double,
keep a common implementation of isinfl() and isnanl() to be used by
platforms where `long double' == `double'; move others into
machine-dependent code.
* In due course, consider __VFP_FP__ on arm.

* Use the common ieee754_* routines (and add ones we were missing).
* Note that several routines are still missing for hppa.

Added hppa support (some of it incomplete) to lib/csu, lib/libc,
and lib/libkvm.

It turns out the hppa ABI we're using does not support an extended-
precision type, so drop the library support for now but leave in place
(#ifdef _LP64) the header definitions.

Err, rename some members added in previous to make them reflect their
semantics better.

Retire local union { floating-type; struct ieee_prec; } in favor of those
available from <machine/ieee.h>

* Since there is no single portable IEEE 754 format for a long double,
keep a common implementation of isinfl() and isnanl() to be used by
platforms where `long double' == `double'; move others into
machine-dependent code.
* In due course, consider __VFP_FP__ on arm.

* Use the common ieee754_* routines (and add ones we were missing).
* Note that several routines are still missing for hppa.

Added hppa support (some of it incomplete) to lib/csu, lib/libc,
and lib/libkvm.

hppa makecontext: Use STACK_ALIGNBYTES to refer to stack alignment.

No functional change intended -- just make it clearer and easier to
search.

PR kern/59327: user stack pointer is not aligned properly

hppa _lwp_makecontext, makecontext: Sort includes.

No functional change intended.

PR kern/59327: user stack pointer is not aligned properly

branches: 1.6.44;
Shut lint up about dp.

From he@

branches: 1.5.2;
Explicitly add back __resumecontext wrapper

Mark _resumecontext as dead. ANSIfy all declarations for it.

branches: 1.3.8;
Remove clause 3 and 4 from TNF licenses

branches: 1.2.18;
__asm__ -> __asm, __volatile__ -> __volatile

add *context and LWP support for hppa. translated from MIPS.

Make NAN a compile time constant (with help from the compiler). Suggested
by krister. Fixes PR 40695.
Make references to the old construct (which we can't remove for binary
compatibility reasons) emit a linker warning.

branches: 1.1.2; 1.1.32;
Push back the descriptions of NaN formats, and descriptions of the
distinction between signalling NaNs and quiet NaNs back into the
machine-dependent headers; treat the implementation of __nanf in the
same spirit.

IEEE 754 leaves the distinction between signalling NaNs and quiet NANs
to the implementation, and unlike our headers used to suggest they're
not identical in the interpretation of the fraction's MSb; in due
course, make those of hppa, mips, sh3, and sh5 reflect reality.

Whitespace.

branches: 1.4.2; 1.4.8;
Mark _resumecontext as dead. ANSIfy all declarations for it.

branches: 1.3.8;
Remove clause 3 and 4 from TNF licenses

branches: 1.2.10;
Sync all resumecontext.c versions with the changes originally made
by Matthias Drochner to i386 and alpha:

-check for a NULL uc_link before calling setcontext(2); do a real exit(3)
instead with exit handlers and all that
-If setcontext(2) returns (which it shouldn't), do an _exit(-1) rather
than relying on a sensible return value to use as exit code. Makes
it less likely that an ucontext corruption goes unnoticed.

branches: 1.1.10;
add *context and LWP support for hppa. translated from MIPS.

Changes to allow libc to compile as PIC on the hppa.

Added hppa support (some of it incomplete) to lib/csu, lib/libc,
and lib/libkvm.

Remove '_OFFSETOF' prefix for genassm(1) generate CPP identifers for
consistency with other arches.

NFCI and libc.so is the same before and after.

Add a space before any non-nullified instruction. NFCI.

Provide a genassym.cf in libc for hppa and use it.

branches: 1.5.2;
setcontext() used to be incompatible with -lpthread since it affected
the TLS pointer, therefore wrecking the pthread environement.

Some ports had _UC_TLSBASE flag or equivalent (_UC_UNIQUE on alpha)
that controlled whether setcontext() would change the TLS pointer.
This change let libpthread override setcontext() with its own version
that unsets _UC_TLSBASE, enabling safe usage of setcontext() with
-lpthread.

We also have the following required changes here:
- rename alpha's _UC_UNIQUE into _UC_TLSBASE
- add _UC_TLSBASE definition in header file for all ports
(powerpc, sh3, sparc and sparc64 lack the implementation for now)
- introduce a libc stub that can be overriden for setcontext()
- modify MD libcs swapcontext() implementations so that they use the
setcontext() libc stub instead of doing a plain system call.

While we are there:
- document various MD _UC_* flags in header file
- add libc and libpthread tests for swapcontext() behavior
(hopefully helpful to spot MD problems introduced with this change)

Future work:
- Deciding whether kernel support or _UC_TLSBASE should be added for
powerpc, sh3, sparc and sparc64 is left to portmasters
sparc64

Approved by core@

branches: 1.4.4; 1.4.8;
Remove clause 3 and 4 from TNF licenses

branches: 1.3.6;
Remove unused include.

Fix unwind info with S/ENTRY/LEAF_&/

Set up the tail of the instruction address queue so that
we don't have to rely on luck for swapcontext(3) to work.

This fixes a problem pointed out to me by Chuck Silvers.

branches: 1.1.10; 1.1.12; 1.1.16;
add *context and LWP support for hppa. translated from MIPS.