Add missing sigaction()

Minimize differences between powerpc and powerpc64
Fix powerpc64 assembly to use right instructions for 64bit CPUs.
Use hidden for __curbrk and __minbrk to avoid GOT/TOC relocations.

branches: 1.1.64;
ppc64 build framework first pass

Merge all MD __sigaction14_sigtramp.c copies into one:
- sparc and sparc64 were not using version 0 sigcontext when there were
no arguments in the signal version. This was probably a bug.
- vax is using +1 the version numbers of the other archs.
- Only hppa was defining __LIBC12_SOURCE__ so it was getting a working
sigcontext before. all the other ports that supported sigcontext had
the compat code disabled.
[pointed out by thorpej, thanks!]
If we want to remove sigcontext support from userland at least now there
is less work to do so.

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

branches: 1.1.18;
Add missing sigaction()

Minimize differences between powerpc and powerpc64
Fix powerpc64 assembly to use right instructions for 64bit CPUs.
Use hidden for __curbrk and __minbrk to avoid GOT/TOC relocations.

branches: 1.3.24;
Kill _NOREGNAMES. Everything should be using %rX now. If it doesn't it
soon will.

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

branches: 1.1.18;
ppc64 build framework first pass

Rename "syscall" to "_syscall" and provide "syscall" as a weak alias.

branches: 1.2.16;
Minimize differences between powerpc and powerpc64
Fix powerpc64 assembly to use right instructions for 64bit CPUs.
Use hidden for __curbrk and __minbrk to avoid GOT/TOC relocations.

branches: 1.1.64;
ppc64 build framework first pass

Minimize differences between powerpc and powerpc64
Fix powerpc64 assembly to use right instructions for 64bit CPUs.
Use hidden for __curbrk and __minbrk to avoid GOT/TOC relocations.

branches: 1.1.64;
we need the current vfork

Minimize differences between powerpc and powerpc64
Fix powerpc64 assembly to use right instructions for 64bit CPUs.
Use hidden for __curbrk and __minbrk to avoid GOT/TOC relocations.

branches: 1.4.20;
Everything else uses PIC branches to __cerror except those two...

fix @toc reference macro

rewrite for ppc elf64 reloc

ppc64 build framework first pass

Replace the branch to __cerror() in powerpc64 syscall stubs
with inline code which does what __cerror() was doing. #ifdef
that code (i.e. all code) out of cerror.S; __cerror() is no more.
This seems to be necessary to fix the link of rescue/rescue, and
should have the pleasant side effect of making all other workarounds
done to keep the 'b __cerror' working unnecessary.

Minimize differences between powerpc and powerpc64
Fix powerpc64 assembly to use right instructions for 64bit CPUs.
Use hidden for __curbrk and __minbrk to avoid GOT/TOC relocations.

branches: 1.5.4;
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: 1.4.2;
PowerPC doesn't have CERROR since it never had a.out.
Use _C_LABEL(__cerror) instead.

Make __cerror protected to restore ABI leak in older libc versions,
where e.g. librt referenced the copy from libc. This still allows libc
to use PC-relative jumps.

branches: 1.2.2; 1.2.4;
Sync with other ports: in PIC mode make __cerror hidden; it is not supposed
to be used outside libc.

ppc64 build framework first pass

Mark exect(3) obsolete and bind it to plain execve(2) on all platforms

The original exect(2) from BSD4.2 was enabling bit for tracing
(single-step mode) and calling execve(2). The purpose of it was to generate
a signal for a tracer once the application will change its image to a new
program.

This approach no longer works as:
- exect(2) traces (single-steps) libc and it requires hundreds or
thousands steps before entering a new image
- it's vax and x86 specific code
- this functionality has been moved to the kernel - once a process is
traced it will generate SIGTRAP with si_code TRAP_EXEC and route it to
its debugger
- the side effects and unportability make this interface unusable
- there are no known users of this interface
- it apparently never worked better since day0 of NetBSD ("day0 bug")

Users are requested to move to other execve(2) variants. Calling current
execve(2) as it is the most similar behavior to this one from BSD4.2.

Discussed several times on mailing lists and in PR/51700.

Add warning to exect(3) telling about marking this function obsolete.

This function is prepared to be removed in next libc major bump.

Sponsored by <The NetBSD Foundation>

branches: 1.1.68; 1.1.72;
ppc64 build framework first pass

Minimize differences between powerpc and powerpc64
Fix powerpc64 assembly to use right instructions for 64bit CPUs.
Use hidden for __curbrk and __minbrk to avoid GOT/TOC relocations.

branches: 1.1.64;
ppc64 build framework first pass

Minimize differences between powerpc and powerpc64
Fix powerpc64 assembly to use right instructions for 64bit CPUs.
Use hidden for __curbrk and __minbrk to avoid GOT/TOC relocations.

branches: 1.4.20;
Everything else uses PIC branches to __cerror except those two...

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

branches: 1.2.18;
convert PIC linkage

ppc64 build framework first pass

Minimize differences between powerpc and powerpc64
Fix powerpc64 assembly to use right instructions for 64bit CPUs.
Use hidden for __curbrk and __minbrk to avoid GOT/TOC relocations.

branches: 1.1.64;
ppc64 build framework first pass

Minimize differences between powerpc and powerpc64
Fix powerpc64 assembly to use right instructions for 64bit CPUs.
Use hidden for __curbrk and __minbrk to avoid GOT/TOC relocations.

branches: 1.2.4;
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: 1.1.44; 1.1.50;
ppc64 build framework first pass

Minimize differences between powerpc and powerpc64
Fix powerpc64 assembly to use right instructions for 64bit CPUs.
Use hidden for __curbrk and __minbrk to avoid GOT/TOC relocations.

Spell LdAddr consistently

branches: 1.3.64;
fix @toc reference macro

convert remaining ppc32 code to ppc64

ppc64 build framework first pass

ppc64 build framework first pass

Minimize differences between powerpc and powerpc64
Fix powerpc64 assembly to use right instructions for 64bit CPUs.
Use hidden for __curbrk and __minbrk to avoid GOT/TOC relocations.

branches: 1.1.64;
ppc64 build framework first pass