Include compiler-rt in libc, libm and libkern.

Use generic version of fabs for softfloat.

Explicitly enable FPU support.

divide.S need -marm

Fix compile error.

modsi3/umodsi3 is not needed for earm since __aeabi_*divmod takes care of it.

Match against LIBC_MACHINE_ARCH for MKCOMPAT

When building for earm*, compile __aeabi_[df]cmpun.c and __aeabi_[il]div0.c

add new files to fix static linking

add split files

branches: 1.18.2;
Backout previous. ld.so requires the division routines so this needs
more thought.

On the libc/libgcc clashes cleanup that removed divsi3.o from libc, ARM/evbarm
was forgotten. This patch fixes it making static binaries possible again!

branches: 1.16.6; 1.16.8;
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/ldexp/modf in the "compat" part (code is identical)
(These are the easy cases where no assembler implementations exist.)

compat shuffle.

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: 1.12.6;
* 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.

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

Retire FPA support from this file at last; suggested by Richard Earnshaw
and not objected to by port-arm.

On FPA, switch back `long double' to double-precision. According to
Richard Earnshaw, extended-precision was never supported by the compiler.

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: 1.1.2;
Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of libc.

branches: 1.1.4; 1.1.10;
Add __aeabi_[fd]cmpun for IEEE unordered compares (requires by ARM RTABI).

branches: 1.1.4; 1.1.10;
Add __aeabi_[fd]cmpun for IEEE unordered compares (requires by ARM RTABI).

compat shuffle.

Use RET and RETc macros for returning.

NetBSD/acorn26 has been using APCS-32 for years, so unifdef -U__APCS_26__.

Local label fixup.

Update asm files to use sp instead of r13. Also tweak a couple of bits in the longjmp code to save an instruction.

Changes needed for ARM ELF shared library support.

branches: 1.1.2;
Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of libc.

compat shuffle.

Local label fixup.

Changes needed for ARM ELF shared library support.

branches: 1.1.2;
Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of libc.

Follow the pattern from powerpc, make lint happy.

no need for linted annotations

shut up lint(1)

branches: 1.5.4; 1.5.8;
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: 1.4.40;
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.

arm: setjmp - fix thumb

"mov" should be spelled "movs" for thumb in unified syntax

arm/asm.h: revert PCREL_GET &c in previous (ok riastradh)

This change needs to be redone and re-verified. I have detailed some
issues in the PR, and it also turns out that some of the changes were
in the !_REENTRANT branch of #ifdef and thus not checked at all.
riastradh asked to back out the changes for now.

PR lib/59391: unnecessary __PIC__ conditionals clutter .S files

arm: Nix most __PIC__ conditionals in .S files.

New macros PCREL_GET(rN,label,pclabel) and PCREL_SYM(label,pclabel)
to enable this by the pattern:

ldr rN, label
#ifdef __PIC__
pclabel:
add rN, rN, pc
#endif
...
label:
#ifdef __PIC__
.word (label - (pclabel + 2*sizeof(instruction)))
#else
.word label
#endif

(sizeof(instruction) = 2 for thumb, 4 for non-thumb.)

No binary change in libc with MKPIE=no (i.e., testing both for
changes to the PIC build and changes to the non-PIC build).

In principle, assembly routines could improve instruction scheduling
by splitting up the ldr and add instructions. But in practice, the
maintenance and auditing burden likely makes this worthwhile by
improving legibility vs a tangle of in-line #ifdefs.

brk.S does things a little differently making it harder to unify.
Could redo it but I don't want to make changes without testing them
first.

PR lib/59391: unnecessary __PIC__ conditionals clutter .S files

branches: 1.17.8;
spaces to tab

Use PLT_SYM.

Fix bug introduced in revision 1.13 which meant longjmp would never
work on EABI where VFP didn't exist.

Hi gimpy!

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

Use less got, add END(), make thumb tolerant.

A small optimization

Actually fail if the magic number is found to be wrong in __longjmp.

Avoid overwriting the {,_}longjmp return value in __ARM_EABI__

ok matt@

AAPCS (EABI) requires that VFP D8-D15 are always saved, regardless whether
the soft float or hard float ABI is being used. However, if there isn't a
FPU that can't be done. So only save/restore them if a FPU is present. When
libc initializes, it does a sysctl to determine if there is a FPU and stores
the result which _setjmp/setjmp uses. If there was a FPU, the magic in the
jmp_buf is changed to reflect that the VFP registers were saved. longjmp uses
the magic to determine if it needs to restore the VFP registers.

Use __ARM_PCS_VFP to determine whether the VFP is being used.

Remove all FPA code.
Support VFP for hard float
Allow MKSOFTFLOAT=no

branches: 1.7.2;
Add #error cases in case someone tries to compile hardfloat VFP libraries.

branches: 1.6.16; 1.6.50;
Use RET and RETc macros for returning.

NetBSD/acorn26 has been using APCS-32 for years, so unifdef -U__APCS_26__.

Local label fixup.

Update asm files to use sp instead of r13. Also tweak a couple of bits in the longjmp code to save an instruction.

Changes needed for ARM ELF shared library support.

branches: 1.1.2;
Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of libc.

Thumbify & add END

branches: 1.4.16; 1.4.50; 1.4.56;
Use RET and RETc macros for returning.

NetBSD/acorn26 has been using APCS-32 for years, so unifdef -U__APCS_26__.

Update arm libc files for 8 byte aligned stack.

branches: 1.1.2;
Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of libc.

Use reach-over sources from common/lib/libc

Use RET and RETc macros for returning.

NetBSD/acorn26 has been using APCS-32 for years, so unifdef -U__APCS_26__.

Avoid leaving junk in the top half of R0 on return.
This fixes port-arm/17440.

branches: 1.1.2; 1.1.4;
Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of libc.

Use reach-over sources from common/lib/libc

Use RET and RETc macros for returning.

NetBSD/acorn26 has been using APCS-32 for years, so unifdef -U__APCS_26__.

Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of libc.

Use reach-over sources from common/lib/libc

Use RET and RETc macros for returning.

NetBSD/acorn26 has been using APCS-32 for years, so unifdef -U__APCS_26__.

Local label fixup.

Update arm libc files for 8 byte aligned stack.

Changes needed for ARM ELF shared library support.

branches: 1.1.2;
Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of libc.

GC

branches: 1.3.44; 1.3.50;
make sure there is a prototype in scope.

__STDC__ is always defined on NetBSD.

branches: 1.1.2;
Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of libc.

fix various typos, mainly in comments, but also log messages, docs, game text.

Call libc's fpgetround.

branches: 1.4.10;
Use c89 function declaration.

branches: 1.3.44;
Fix typos, reported by Alexey Dobriyan ("Gathered from Linux"),
forwarded by jmc@openbsd.

Add missing __RCSID()

Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of 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: 1.1.2;
Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of libc.

Retire FPA support from this file at last; suggested by Richard Earnshaw
and not objected to by port-arm.

On FPA, switch back `long double' to double-precision. According to
Richard Earnshaw, extended-precision was never supported by the compiler.

Redo the VFP/endianness conditional logic of this file, making it easier
to read. No functional change except for the side-effect of fixing the
ARMEB FPA case, which wasn't supported anyway.

Replace infinity.c with one in the style of the new ieee754_infinity.c, but
with extra #ifdefs for FPA-format doubles. This gets it compiling again.

Handle machines using VFP-format doubles (as we do in ARM ELF) and big-endian
systems correctly.

branches: 1.1.2;
Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of libc.

Retire FPA support from this file at last; suggested by Richard Earnshaw
and not objected to by port-arm.

On FPA, switch back `long double' to double-precision. According to
Richard Earnshaw, extended-precision was never supported by the compiler.

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

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).

Change isnan() and isinf() to use a union to convert from double to
struct ieee_double, rather than a pointer cast. This seems to enable
GCC 2.95.3 to get the instruction dependencies right (the old one fell
foul of ANSI aliasing rules), and it also generates more sensible code in
general.

If this is the correct solution, it should be applied to the other ports.
If it's not, someone should come up with one that _is_ correct.

branches: 1.1.2;
Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of libc.

On FPA, switch back `long double' to double-precision. According to
Richard Earnshaw, extended-precision was never supported by the compiler.

Remove an unnecessary line continuation backslash from previous.

Update for FPA 80-bit extended-precision format.

Swap VFP and FPA sections to match the style of most other code;
no functional change.

* 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).

Change isnan() and isinf() to use a union to convert from double to
struct ieee_double, rather than a pointer cast. This seems to enable
GCC 2.95.3 to get the instruction dependencies right (the old one fell
foul of ANSI aliasing rules), and it also generates more sensible code in
general.

If this is the correct solution, it should be applied to the other ports.
If it's not, someone should come up with one that _is_ correct.

branches: 1.1.2;
Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of libc.

On FPA, switch back `long double' to double-precision. According to
Richard Earnshaw, extended-precision was never supported by the compiler.

Update for FPA 80-bit extended-precision format.

Swap VFP and FPA sections to match the style of most other code;
no functional change.

* 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).

Rename a parameter to fix build problem with new toolchain.

branches: 1.1.2;
Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of libc.

no need for linted annotations

branches: 1.3.4; 1.3.8; 1.3.26;
Remove clause 3 and 4 from TNF licenses

branches: 1.2.30;
Merge the nathanw_sa branch.

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

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: 1.1.2;
Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of 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: 1.1.2;
Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of libc.

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;
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: 1.2.16;
Merge the nathanw_sa branch.

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

arm: setjmp - fix thumb

"mov" should be spelled "movs" for thumb in unified syntax

arm/asm.h: revert PCREL_GET &c in previous (ok riastradh)

This change needs to be redone and re-verified. I have detailed some
issues in the PR, and it also turns out that some of the changes were
in the !_REENTRANT branch of #ifdef and thus not checked at all.
riastradh asked to back out the changes for now.

PR lib/59391: unnecessary __PIC__ conditionals clutter .S files

arm: Nix most __PIC__ conditionals in .S files.

New macros PCREL_GET(rN,label,pclabel) and PCREL_SYM(label,pclabel)
to enable this by the pattern:

ldr rN, label
#ifdef __PIC__
pclabel:
add rN, rN, pc
#endif
...
label:
#ifdef __PIC__
.word (label - (pclabel + 2*sizeof(instruction)))
#else
.word label
#endif

(sizeof(instruction) = 2 for thumb, 4 for non-thumb.)

No binary change in libc with MKPIE=no (i.e., testing both for
changes to the PIC build and changes to the non-PIC build).

In principle, assembly routines could improve instruction scheduling
by splitting up the ldr and add instructions. But in practice, the
maintenance and auditing burden likely makes this worthwhile by
improving legibility vs a tangle of in-line #ifdefs.

brk.S does things a little differently making it harder to unify.
Could redo it but I don't want to make changes without testing them
first.

PR lib/59391: unnecessary __PIC__ conditionals clutter .S files

branches: 1.19.2;
arm longjmp: Restore stack first, then signal mask.

Otherwise, a pending signal may be delivered on the wrong stack when
we restore the signal mask.

While here:

- Move the botched sp and lr tests earlier.

PR lib/57946

branches: 1.18.2;
Trailing whitespace

branches: 1.17.28;
Use PLT_SYM.

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

Use less got, add END(), make thumb tolerant.

A small optimization

Actually fail if the magic number is found to be wrong in __longjmp.

Avoid overwriting the {,_}longjmp return value in __ARM_EABI__

ok matt@

AAPCS (EABI) requires that VFP D8-D15 are always saved, regardless whether
the soft float or hard float ABI is being used. However, if there isn't a
FPU that can't be done. So only save/restore them if a FPU is present. When
libc initializes, it does a sysctl to determine if there is a FPU and stores
the result which _setjmp/setjmp uses. If there was a FPU, the magic in the
jmp_buf is changed to reflect that the VFP registers were saved. longjmp uses
the magic to determine if it needs to restore the VFP registers.

Use __ARM_PCS_VFP to determine whether the VFP is being used.

Remove all FPA code.
Support VFP for hard float
Allow MKSOFTFLOAT=no

branches: 1.9.2;
Add #error cases in case someone tries to compile hardfloat VFP libraries.

branches: 1.8.10; 1.8.44;
more renaming.

compat shuffle.

Use RET and RETc macros for returning.

NetBSD/acorn26 has been using APCS-32 for years, so unifdef -U__APCS_26__.

Local label fixup.

Update arm libc files for 8 byte aligned stack.

Changes needed for ARM ELF shared library support.

branches: 1.1.2;
Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of libc.

Use PLT_SYM.

Use less got, add END(), make thumb tolerant.

Ignore VFP bit in magic.

branches: 1.5.10; 1.5.44; 1.5.50;
more renaming.

compat shuffle.

Local label fixup.

Changes needed for ARM ELF shared library support.

branches: 1.1.2;
Create shared ARM source for libc, and move arm26 port over to using it.
The code is (almost) a direct copy of the current arm26 sources.
It's identical to the current arm32 sources, with the following exceptions:
- _C_LABEL is used on references to C labels from assembler.
- Function returns in assembler have APCS-26 versions in #ifdef __APCS_26__.
- It uses SoftFloat 2a rather than SoftFloat 1a.

The first two of these should be inconsequential. I believe that SoftFloat 2a
should work on arm32 and be backward-compatible with existing code, but this
is not obviously true. For now, arm32 remains using its own bits of libc.

Do previous differtly by pushing two registers in the same way as the
_INVOKE_CERROR macro

Fix previous. For Thumb-1:
- sp cannot be manipulated directly
- {add,sub}s should be used instead of {add,sub}

Align sp to 8-byte boundary as required by EABI.

IIUC, this change only affects libc compiled for ``Thumb-mode userland'',
which we've not officially supported yet.

branches: 1.15.2;
Fix a comment

branches: 1.14.24; 1.14.26;
Use PLT_SYM.

Fix the .cfi correctly.

Fix build by matching .cfi/#if.

only emit cfi if __ARM_EABI__ && __UNWIND_TABLES__

Use less got, add END(), make thumb tolerant.

Add missing registers.

Remove magic numbers.

Fixup the stack pointer in the ucontext returned by getcontext.

This fixes the following tests

lib/libc/sys/t_swapcontext.c
lib/libpthread/t_swapcontext.c

branches: 1.6.2;
Ensure stack alignment. "looks fine" matt@

branches: 1.5.4; 1.5.8; 1.5.24; 1.5.26;
Remove clause 3 and 4 from TNF licenses

branches: 1.4.16; 1.4.24;
Use RET and RETc macros for returning.

NetBSD/acorn26 has been using APCS-32 for years, so unifdef -U__APCS_26__.

Merge the nathanw_sa branch.

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