Unify signbitl implementations.
(Unclear why they were different, it was only the comments that
differed)

Add a comment describing why the generic version works for both 80-bit
and 128-bit double.

branches: 1.19.46;
Rename ${SRCS.{alpha,arm,...}.gen} to ${LSRCS.{alpha,arm,...}.gen} because
they ended up in ${LSRCS}, not ${SRCS}. ${SRCS.*} namespace will be used
for more useful things. No functional changes intended.

build frexp_ieee754 and ldexp_ieee754 in the "compat" subtree
(There is an assembler version of modf which needs to be checked.)

rename the files in gen like we did for i386.

Bring sparc64 to the new compat layout.

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: 1.14.6;
* 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.

Avoid using the depreceated __sigreturn14 for longjmp by adapting
Christian Limpachs arch/m68k implementation using setcontext().

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

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.

Rework how dependency generation is performed:

* DPSRCS contains extra dependencies, but is _NOT_ added to CLEANFILES.
This is a change of behaviour. If a Makefile wants the clean semantics
it must specifically append to CLEANFILES.
Resolves PR toolchain/5204.

* To recap: .d (depend) files are generated for all files in SRCS and DPSRCS
that have a suffix of: .c .m .s .S .C .cc .cpp .cxx

* If YHEADER is set, automatically add the .y->.h to DPSRCS & CLEANFILES

* Ensure that ${OBJS} ${POBJS} ${LOBJS} ${SOBJS} *.d depend upon ${DPSRCS}

* Deprecate the (short lived) DEPENDSRCS


Update the various Makefiles to these new semantics; generally either
adding to CLEANFILES (because DPSRCS doesn't do that anymore), or replacing
specific .o dependencies with DPSRCS entries.

Tested with "make -j 8 distribution" and "make distribution".

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.

Merge the nathanw_sa branch.

Clean up some rampant code duplication wrt ieee number handling:
- Add alignment-safe double and float unions.
- Use the above for the __infinity and __nan constants on all
architectures that use the standard ieee754 representation of
those constants.
- Add a single copy of various ieee754 math functions (frexp, isinf,
isnan, ldexp and modf) that had numerous duplicates among the
arch-specific directories.
- Use the above functions on all architectures where the generic C
versions where used. Architectures that had local assembly
routines are untouched (for those functions only).

branches: 1.4.6;
C99: Define a NAN macro in <math.h> which evaulates to a constant expression of
a single-precision quiet NaN; only to be defined on platforms that do support
this value.

Move the bswap functions from libutil to libc (this bups the
minor of libc and the major of libutil). For little-endian architectures
merge the bnswap() assembly versions with nto* and hton* using symbols
aliasing. Use symbol renaming for the bswap function in this case to avoid
namespace pollution.
Declare bswap* in machine/bswap.h, not machine/endian.h. For little-endian
machines, common code for inline macros go in machine/byte_swap.h
Sync libkern with libc.
Adjust #include in kernel sources for machine/bswap.h.

Fix libc signal breakage (I hope).

Add sparc64-specific libc.

rename the files in gen like we did for i386.

Add missing <compat/..> include

Simplify slightly and fix a comment.

Forgot to mention in last commit message: remove some accidently commited
debug code.

Unfortunately we can not restore the signal mask with setcontext() - this
breaks libpthread, which tries to intercept the weak sigprocmask symbol.
So use an explicit sigprocmask call instead.

Avoid using the depreceated __sigreturn14 for longjmp by adapting
Christian Limpachs arch/m68k implementation using setcontext().

rename the files in gen like we did for i386.

Call PIC_PROLOGUE only once.

Store the correct boolean value in sc_onstack.

Too sad - inlining syscall stubs on sparc64 is so much easier than doing
PIC calls to the libc stubs, but unfortunately we need to do the latter-
otherwise we break weak symbol semantics and make libpthread fail.
Thanks to Christian Limpach for the analyzis.

Avoid using the depreceated __sigreturn14 for longjmp by adapting
Christian Limpachs arch/m68k implementation using setcontext().

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

Fix layout of fields in jmp_buf. [N.B. we could make JMP_BUFLEN 9 if we want.]

branches: 1.2.10;
More fixes to signal handling code...

Fix libc signal breakage (I hope).

rename the files in gen like we did for i386.

Store the "signal mask saved" flag at the end of the jmp_buf - we now use
more of it than before (and I bet the old place just is a non translated
32bit sparc value).

Fix two inverted comparisions and a few comments.
This makes sparc64 pass the sigsetjmp regression tests.

Use large (-fPIC) relocations.

branches: 1.4.2;
Fix layout of fields in jmp_buf. [N.B. we could make JMP_BUFLEN 9 if we want.]

Update some more assembly code for PIC issues.

Fix PIC bugs.

branches: 1.1.10;
Fix libc signal breakage (I hope).

Avoid lint warnings

branches: 1.6.4;
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: 1.5.8; 1.5.20;
Remove clause 3 and 4 from TNF licenses

branches: 1.4.18;
Add missing __RCSID()

Make sure we reference getcontext() by its internal name.

Merge the nathanw_sa branch.

branches: 1.1.2;
file _lwp.c was initially added on branch nathanw_sa.

Save/restore some global registers (sigsetjmp compatible). Does not realy
make a difference currently, but is a hard to spot blackhole if something
ever starts using the application registers.

Replace the stack unwinding by a much simpler solution taken from
../../arch/sparc/gen/_setjmp.S rev. 1.6. This ended up to be ~identical
to the OpenBSD change triggered by the same sparc change.
Thanks to Stoned Elipot for pointing out the problem.

branches: 1.5.2; 1.5.4;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

Fix libc signal breakage (I hope).

Libc fixes, mostly to work around the new signal stuff.

Bring in definition for stack BIAS.

Add sparc64-specific libc.

Remove the sparc-v7 compatibility wrapper functions (.div, .mul, ... .urem),
the compiler never generates (or did generate in the past) 64bit code to call
them, and they are still present in our 32bit compat library.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

move includes to the top so that this builds in libc context too.

use %g5 instead of %g7 (since we want to use %g7 for the cpu_info pointer
in the kernel). resync libc and libkern versions of this file.

branches: 1.1.12;
Add sparc64-specific libc.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

Floating point argument should be in %f0 (sparcv9 ABI says).

Check how the compiler expects the return value of this function
by testing SOFTFLOATSPARC64_FOR_GCC.

Should fix PR port-sparc64/20140.

branches: 1.2.4;
Fix stack BIAS issues.

branches: 1.1.10;
Add sparc64-specific libc.

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: 1.4.56; 1.4.62;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

Make __dtoul() actually DTRT. The calling convention was totally wrong, and
the `big' value should be 2^63, not 2^31.
Also, nuke __fixunsdfsi(), since this is never output by the sparc64 compiler.

branches: 1.2.8;
Add _dtoul() which gcc generates a lot. Maybe it should go in another file.

Add sparc64-specific libc.

fix old style definitions; XXX: gcc should have picked them up but it did not.

delint

branches: 1.4.44;
__asm__ -> __asm

Add missing __RCSID()

Corrent map order to match sparc/ieeefp.h.

Add sparc64-specific libc.

PR 48384: reorganize struct ieee_ext for sparc64 to only use a high/low
part for the mantissa.
Adjust arch specific code accordingly.

branches: 1.2.4; 1.2.8; 1.2.28;
Remove clause 3 and 4 from TNF licenses

branches: 1.1.30;
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.

fix old style definitions; XXX: gcc should have picked them up but it did not.

delint

branches: 1.4.44;
__asm__ -> __asm

Add missing __RCSID()

Add internal names for fp{get,set}{mask,round,sticky}(), and
externally-visible weak aliases for the internal names.

branches: 1.1.12;
Add sparc64-specific libc.

fix old style definitions; XXX: gcc should have picked them up but it did not.

delint

branches: 1.4.44;
__asm__ -> __asm

Add missing __RCSID()

Add internal names for fp{get,set}{mask,round,sticky}(), and
externally-visible weak aliases for the internal names.

branches: 1.1.12;
Add sparc64-specific libc.

fix old style definitions; XXX: gcc should have picked them up but it did not.

delint

branches: 1.5.4;
While we use hardware (for float and double), but cooperate with softfloat
(to do long double), we need to not only handle the hardware exception
mask and cummulated flags, but also update/query the softfloat variables.
Since this may go away sometime (to make us psABI compliant), ifdef it
properly.

__asm__ -> __asm

Add missing __RCSID()

Add internal names for fp{get,set}{mask,round,sticky}(), and
externally-visible weak aliases for the internal names.

branches: 1.1.12;
Add sparc64-specific libc.

convert to ANSI C definitions.

branches: 1.6.2;
delint

branches: 1.5.4;
While we use hardware (for float and double), but cooperate with softfloat
(to do long double), we need to not only handle the hardware exception
mask and cummulated flags, but also update/query the softfloat variables.
Since this may go away sometime (to make us psABI compliant), ifdef it
properly.

__asm__ -> __asm

Add missing __RCSID()

Add internal names for fp{get,set}{mask,round,sticky}(), and
externally-visible weak aliases for the internal names.

branches: 1.1.12;
Add sparc64-specific libc.

sparc64/fpsetround: avoid shifting into the sign bit

Lint had warned about the constant expression '0x03 << 30' but not about
the structurally equal nonconstant expression '(rnd_dir & 0x03) << 30'.

No binary change.

fix lint

convert to ANSI C definitions.

While we are using softfloat for 128 bit long double values, make fpsetround
update the softfloat rounding mode as well.

branches: 1.5.2;
delint

branches: 1.4.44; 1.4.46;
__asm__ -> __asm

Add missing __RCSID()

Add internal names for fp{get,set}{mask,round,sticky}(), and
externally-visible weak aliases for the internal names.

branches: 1.1.12;
Add sparc64-specific libc.

convert to ANSI C definitions.

branches: 1.6.2;
delint

branches: 1.5.4;
While we use hardware (for float and double), but cooperate with softfloat
(to do long double), we need to not only handle the hardware exception
mask and cummulated flags, but also update/query the softfloat variables.
Since this may go away sometime (to make us psABI compliant), ifdef it
properly.

__asm__ -> __asm

Add missing __RCSID()

Add internal names for fp{get,set}{mask,round,sticky}(), and
externally-visible weak aliases for the internal names.

branches: 1.1.12;
Add sparc64-specific libc.

Clean up some rampant code duplication wrt ieee number handling:
- Add alignment-safe double and float unions.
- Use the above for the __infinity and __nan constants on all
architectures that use the standard ieee754 representation of
those constants.
- Add a single copy of various ieee754 math functions (frexp, isinf,
isnan, ldexp and modf) that had numerous duplicates among the
arch-specific directories.
- Use the above functions on all architectures where the generic C
versions where used. Architectures that had local assembly
routines are untouched (for those functions only).

branches: 1.4.10;
Trivial KNF.

Make the C version of frexp() consitent across platforms, and handle the
Inf/NaN case.

Just some minor cleanup.

Add sparc64-specific libc.

Clean up some rampant code duplication wrt ieee number handling:
- Add alignment-safe double and float unions.
- Use the above for the __infinity and __nan constants on all
architectures that use the standard ieee754 representation of
those constants.
- Add a single copy of various ieee754 math functions (frexp, isinf,
isnan, ldexp and modf) that had numerous duplicates among the
arch-specific directories.
- Use the above functions on all architectures where the generic C
versions where used. Architectures that had local assembly
routines are untouched (for those functions only).

branches: 1.3.2;
check LIBC_SCCS

delint

Add sparc64-specific libc.

Add missing __RCSID()

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

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

branches: 1.1.30;
C99 7.12.3.2: add library portions of isfinite, but don't build these just
yet.

Clean up some rampant code duplication wrt ieee number handling:
- Add alignment-safe double and float unions.
- Use the above for the __infinity and __nan constants on all
architectures that use the standard ieee754 representation of
those constants.
- Add a single copy of various ieee754 math functions (frexp, isinf,
isnan, ldexp and modf) that had numerous duplicates among the
arch-specific directories.
- Use the above functions on all architectures where the generic C
versions where used. Architectures that had local assembly
routines are untouched (for those functions only).

branches: 1.5.6;
Delint.

Separate isnan() into a separate module, and make isinf()/isnan() use ieee.h.

delint

Need internal names for isinf() and isnan().

Add sparc64-specific libc.

PR 48384: reorganize struct ieee_ext for sparc64 to only use a high/low
part for the mantissa.
Adjust arch specific code accordingly.

branches: 1.4.56; 1.4.62;
* 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.

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.

Clean up some rampant code duplication wrt ieee number handling:
- Add alignment-safe double and float unions.
- Use the above for the __infinity and __nan constants on all
architectures that use the standard ieee754 representation of
those constants.
- Add a single copy of various ieee754 math functions (frexp, isinf,
isnan, ldexp and modf) that had numerous duplicates among the
arch-specific directories.
- Use the above functions on all architectures where the generic C
versions where used. Architectures that had local assembly
routines are untouched (for those functions only).

branches: 1.4.6;
Delint.

Separate isnan() into a separate module, and make isinf()/isnan() use ieee.h.

Need internal names for isinf() and isnan().

Add sparc64-specific libc.

PR 48384: reorganize struct ieee_ext for sparc64 to only use a high/low
part for the mantissa.
Adjust arch specific code accordingly.

branches: 1.4.56; 1.4.62;
* 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.

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.

Clean up some rampant code duplication wrt ieee number handling:
- Add alignment-safe double and float unions.
- Use the above for the __infinity and __nan constants on all
architectures that use the standard ieee754 representation of
those constants.
- Add a single copy of various ieee754 math functions (frexp, isinf,
isnan, ldexp and modf) that had numerous duplicates among the
arch-specific directories.
- Use the above functions on all architectures where the generic C
versions where used. Architectures that had local assembly
routines are untouched (for those functions only).

fix for -Wshadow

branches: 1.8.10;
Another microoptimization. Take advantage of the addition already having set
the flags for the <=0 comparison.

Reuse the trick of loading 0.0 (rather than 1.0) and then modifying the
exponent. It's a bit faster on some machines.

Remove more unused mulexp variables.

ldexp(denormal, exp>1023) would generate the wrong result in all non-overflow
cases. Totally rework this code to fix this bug *and* make it faster.

Don't ever return -0.0.

Minor style change.

Just some minor cleanup.

Add sparc64-specific libc.

sparc, sparc64 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.

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

branches: 1.7.44;
delint

branches: 1.6.4;
Fix previous: the way we calculate, we need to test the size of sigjmp_buf

Add another compile time assert: catch overflows of jmp_buf

Rearange jmp_buf content again: storing the sigsetjmp() save_mask midway
inside the environment is not a good idea, we may overwrite it when
fetching other details of the sigjmp environment.
Instead move it to the very end again.
Do not bother to save volatile (caller saved) global registers.
Fixes PR port-sparc64/44918.

Fix offsets used in the assembly code to save global registers into a
jmp_buf, add a compile time assert to catch this kind of divergence
in the C code.
Move the fixed "%npc = %pc + 4" computation to longjmp, this frees
the sigcontext sc_npc value. Use this space to save the savemask
for siglongjmp (we have run out of space behind the globals).
Fixes the tests/lib/libc/setjmp/t_threadjmp tests, and also hopefully
fixes PR port-sparc64/44902.

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

branches: 1.1.18;
rename the files in gen like we did for i386.

delint

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

branches: 1.3.18;
in makecontext(), sp is unsigned * so don't assign signed *'s to it.

Merge the nathanw_sa branch.

branches: 1.1.2;
file makecontext.c was initially added on branch nathanw_sa.

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: 1.4.56; 1.4.62;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

Fix modf() (I hope. Can't be any worse than the old version.)

Fix stack BIAS issues.

branches: 1.1.10;
Add sparc64-specific libc.

Use reach-over sources from common/lib/libc

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

Add sparc64-specific libc.

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: 1.3.2; 1.3.32;
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.

Clean up some rampant code duplication wrt ieee number handling:
- Add alignment-safe double and float unions.
- Use the above for the __infinity and __nan constants on all
architectures that use the standard ieee754 representation of
those constants.
- Add a single copy of various ieee754 math functions (frexp, isinf,
isnan, ldexp and modf) that had numerous duplicates among the
arch-specific directories.
- Use the above functions on all architectures where the generic C
versions where used. Architectures that had local assembly
routines are untouched (for those functions only).

branches: 1.1.6;
C99: Define a NAN macro in <math.h> which evaulates to a constant expression of
a single-precision quiet NaN; only to be defined on platforms that do support
this value.

Mark _resumecontext as dead. ANSIfy all declarations for it.

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

branches: 1.3.10;
Pull over rev. 1.5 of the i386 version (../../i386/resumecontext.S),
quoting Matthias Drochner:

> -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.

This also fixes regress/lib/libc/context for sparc64.

branches: 1.2.16;
Merge the nathanw_sa branch.

branches: 1.1.2;
file resumecontext.c was initially added on branch nathanw_sa.

Use reach-over sources from common/lib/libc

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

Update some more assembly code for PIC issues.

branches: 1.1.10;
Add sparc64-specific libc.

Consistently pass 0 as first and ignored argument to sigprocmask in the
setjmp implementations.

NFCI.

Trailing whitespace

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: 1.9.4; 1.9.10;
Rearange jmp_buf content again: storing the sigsetjmp() save_mask midway
inside the environment is not a good idea, we may overwrite it when
fetching other details of the sigjmp environment.
Instead move it to the very end again.
Do not bother to save volatile (caller saved) global registers.
Fixes PR port-sparc64/44918.

Fix offsets used in the assembly code to save global registers into a
jmp_buf, add a compile time assert to catch this kind of divergence
in the C code.
Move the fixed "%npc = %pc + 4" computation to longjmp, this frees
the sigcontext sc_npc value. Use this space to save the savemask
for siglongjmp (we have run out of space behind the globals).
Fixes the tests/lib/libc/setjmp/t_threadjmp tests, and also hopefully
fixes PR port-sparc64/44902.

rename the files in gen like we did for i386.

Bring sparc64 to the new compat layout.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

Fix layout of fields in jmp_buf. [N.B. we could make JMP_BUFLEN 9 if we want.]

branches: 1.3.10;
Fix libc signal breakage (I hope).

Libc fixes, mostly to work around the new signal stuff.

Add sparc64-specific libc.

Unify signbitl implementations.
(Unclear why they were different, it was only the comments that
differed)

Add a comment describing why the generic version works for both 80-bit
and 128-bit double.

branches: 1.2.8; 1.2.64;
Remove clause 3 and 4 from TNF licenses

branches: 1.1.30;
Add C99 fpclassify(), isfinite(), isnormal(), and signbit() macros.

Redo previous to fix build break.

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: 1.10.4; 1.10.10;
Rearange jmp_buf content again: storing the sigsetjmp() save_mask midway
inside the environment is not a good idea, we may overwrite it when
fetching other details of the sigjmp environment.
Instead move it to the very end again.
Do not bother to save volatile (caller saved) global registers.
Fixes PR port-sparc64/44918.

Fix offsets used in the assembly code to save global registers into a
jmp_buf, add a compile time assert to catch this kind of divergence
in the C code.
Move the fixed "%npc = %pc + 4" computation to longjmp, this frees
the sigcontext sc_npc value. Use this space to save the savemask
for siglongjmp (we have run out of space behind the globals).
Fixes the tests/lib/libc/setjmp/t_threadjmp tests, and also hopefully
fixes PR port-sparc64/44902.

rename the files in gen like we did for i386.

Bring sparc64 to the new compat layout.

Use large (-fPIC) relocations.

branches: 1.5.2;
Fix layout of fields in jmp_buf. [N.B. we could make JMP_BUFLEN 9 if we want.]

Update some more assembly code for PIC issues.

Fix PIC bugs.

branches: 1.2.10;
Fix libc signal breakage (I hope).

Add sparc64-specific libc.

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

Fix register usage

branches: 1.6.2;
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: 1.5.4;
ABI police: avoid cluttering global registers %g2 and %g7. Not quite there
yet for %g2, but the target is not very well defined. %g7 should be clean
now.

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

branches: 1.3.30;
Declare global register.

Merge the nathanw_sa branch.

branches: 1.1.2;
file swapcontext.S was initially added on branch nathanw_sa.

Use reach-over sources from common/lib/libc

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

Add sparc64-specific libc.