Undo previous; breaks macppc/m68k (at least)

Enable initfini array support for everyone.

Do not pass the main object handle from the assembler startup stub to
the common ___start routine. It's only used for a pointless magic
version check. Thanks to martin@ for testing various architectures.

branches: 1.32.14; 1.32.16;
Revert -O1 hack for GCC 5.3, replaced by workaround in the code.

We need the -O1 hack (for gcc 5.3) for crtbegin.c as well.
Works around PR toolchain/51121.

Revert previous (fallout is more subtle but there).
Rework the conditionon so it depends on .S existence instead of an arch
list.

Gcc 5.3 seems to do fine compiling this for sparc64, so exclude it
from the -O1 hack

For the benefit of compilers not using our native C runtime environment,
install a "sysident.o" file providing the note identifying NetBSD
executables (and marking the currently installed version).

crt0-common.c is miscompiled by gcc 5.3 on evbarm with -O2 so use -O1. Do
this for all non-x86 arches.

add a hack for GCC 5 and non-x86 platforms:

build crtbeginS.o with -O1 as GCC tries to be very smart with the
__DTOR_LIST__ as it believes it knows the size of the array at
compile time (which is not true until link time). on SPARC and
MIPS, the result was emitting a call to 0.

technically, i believe that GCC isn't "wrong" to make this choice,
as the array is declared with a well-known initialiser size in the
crtbegin.c compilation unit, and we have noticed that the libgcc
version of this code has some hacks added, most likely to avoid
being bitten by this optimisation.


this makes sshd work for me on earm and sparc with GCC 5.

Add GENASSYM_CPPFLAGS in two more places.

Using ${LD} -x screws up BE arm. Use ${OBJCOPY} ${OBJCOPYLIBFLAGS} instead
so the $a/$t/$d symbols are preserved.

Simplify previous by using CSU_MACHINE_ARCH. Hint from Takeshi Nakayama.

We do not want to build the code model markes when creating the 32bit
compat libs for sparc64

On sparc64: create additional "marker" object files, that can be used by the
compiler to encode the used code model in binaries.

Explicitly depend on sys/param.h to pick up __NetBSD_Version changes.

Fix previous: use PICFLAGS for crtbeginS.o
Should unbreak sh3 builds.

XXX: PICFLAGS is defined in bsd.lib.mk which lib/csu does not use.
For now supply a local definition. joerg@, please fix appropriately.

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

Add support for a NetBSD MARCH elf note to record the MACHINE_ARCH for
which a program was compiled.

Alpha needs crtfm.o for USE_COMPILERCRTSTUFF=no

Only supplie -fPIE to crtbegin.c if MKPIC is yes.

branches: 1.14.2;
Use -fPIE for crtbegin.o (instead of -fpie).
Fixes linking the firefox js shell. Ok: joerg@

Only install crtbeginS.o, crtbeginT.o and crtendS.o when MKPIC=yes.

Switch arm, earm, powerpc to use crtbegin.c
Use -fpie for crtbegin.

Add -fPIC to compile of crtbeginS.o

Reorder to avoid !exists
Add a crtbegin.h dependency

Add a common crtbegin.c file and use a machine dependent crtbegin.h to
fill in .init/.fini.
Add mips support for USE_COMPILERCRTSTUFF=no (compiled only)

Allow crtbegin to be a C file.

branches: 1.7.2;
Don't pass assembler flags to genassym, it doesn't compile.

Move crt0.S in front of crt0-common.c when building crt0.o and gcrt0.o.
Reading disassembly is easier when the asm crt0.S trampoline is at the
start, not hidden behind the C code in crt0-common.c.

Hmm, funny. I wonder why and how did emacs VC managed to add

Warning: Permanently added the RSA host key for IP address '...' to the list of known hosts.

to the committed file. (hi, new cvs!)

Use -DPIC to compile crtbeginS.o since that's what <machine/asm.h>
headers check.

branches: 1.3.4;
use of .PARSEDIR just doesn't work with .OBJDIR, replace with .CURDIR

branches: 1.2.2;
Build assembler sources with assembler compile rules.

Switch i386 and x86_64 to the new CRT layout. The crt0.c body is shared
between all platforms and a small assembler stub in crt0.S is used for
setting up the proper stack and whatever else MD needs.

Extract crti.S and crtn. from the old dot_init.h files. Prepare other
platforms that use the 6-argument form of __(_)start for this.

Rewrite the crtbegin and crtend modules in assembler to make them
compiler independent. Document the interface in README.

Change section flags to "MG" and put it into comdat.
Makes new binutils happy.

branches: 1.3.2; 1.3.6;
Ensure notes are properly padded to 32bit length.

branches: 1.2.2;
Make the .note section mergable and set proper "item" length.
XXX seems to be impossible to do that with gas w/o causing a (bogus)
warning - but the resulting object file is fine.

On sparc64: create additional "marker" object files, that can be used by the
compiler to encode the used code model in binaries.

lib/csu: Add support for RELR relocations in static PIEs.

Same logic as in ld.elf_so, but baked into the executable itself for
static PIEs.

Addendum to proposal on tech-userlevel:
https://mail-index.NetBSD.org/tech-userlevel/2025/04/27/msg014727.html

PR bin/59360: ld.elf_so(8): missing RELR support

PR/59189: RVP: move atexit(cleanup) after _preinit() to allow sanitizer
initialization during preinit as well as atexit interception.

branches: 1.28.2;
declare _libc_init() in header.

Support ifunc on aarch64. The tests pass at least.

Wrap long #if defined(...) || ... and sort. NFCI.

Trailing whitespace

Instead of compiling files with -fcommon, create an include file and declare
the 3 symbols that need to be common using an attribute. Put all the 3 symbol
definitions in libc in one place (initfini.c). Reviewed by joerg@

Re-do previous (always make available preinit/initarray/finiarray), with
less disruption.

Undo previous; breaks macppc/m68k (at least)

Allow both array and non-array constructors for transition.

Do not pass the main object handle from the assembler startup stub to
the common ___start routine. It's only used for a pointless magic
version check. Thanks to martin@ for testing various architectures.

i386/amd64 build fix. Fix "possibly used uninitialized" from gcc.
These changes should make no practical effect - but because external
data is being examined, it would be possible to contrive a situation
(perhaps) where uninit'd vars could actually be used (unless the format
has been checked elsewhere earlier - I did not look ... we have to
appease gcc anyway).

Joerg: Please review (& fix)

Add static PIE support for i386 and AMD64.

The basic glue works with mininal changes for other architectures as
well, but those require linker changes first to avoid leaking dynamic
relocations into the binary.

_DYNAMIC is present for static PIE as well, so loosen rtld check.

branches: 1.16.2;
Move the complex logic for dynamically writing branches from ld.elf_so
into a header for reuse in crt0.o for static ifunc support. Change the
existing logic for sparc64 to use the Bicc variant of ba,a as it allows
+-8MB displacement compared to the BPcc variant's +-1MB. Teach the sparc
variant the same trick for using ba,a and not sethi+jmp when possible.

Add ifunc support for statically linked applications on x86, ppc, sparc
and ARM.

branches: 1.14.14;
Fun fact of the weak: a weak reference doesn't have visibility attached.
As such, reorganize the start/end references to use a weak reference
only, if we use it to remove size knowledge. Otherwise use weak
external declarations.

Add support for PREINIT_ARRAY

Use __weakref_visible (from joerg@)

Make with work with gcc 4.5 or clang.

Fix static weak (to extern weak)

branches: 1.9.2;
Add support for init_array/fini_array (conditionalized on HAVE_INITFINI_ARRAY).
[This is needed for ARM EABI.]

Add some more __dead as exposed by the recent WARN bumps.

branches: 1.7.2; 1.7.6;
Mark ___start as .hidden (for MKPIE=yes executables).

Assert that ps_strings is valid. Use it to drop the first three
arguments to ___start to make the assembler callers simpler.

Pass down ELF Auxillary Vectors for static NetBSD binaries too.
Rename __libc_init to _libc_init and call it explicitly from CSU code.
This enforces the constructor run order for newly linked programs.
Keep it as constructor with run-once semantic for binary compatibility.
Implement dl_iterate_phdr for statically linked programs.

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

Introduce __weakref_visible to handle the different required visibility
for weak references. GCC 4.2+ and Clang require static, older GCC wants
extern. Change __weak_reference to include sym. This requires changes
the existing users to not reuse the name of the symbol, but avoids
further differences between GCC 4.1 and GCC 4.2+/clang.

Allow building with the changed weakref semantic in GCC 4.2 and clang.

Distinguish between a corrupt obj pointer and a null obj pointer.

branches: 1.1.2;
Switch i386 and x86_64 to the new CRT layout. The crt0.c body is shared
between all platforms and a small assembler stub in crt0.S is used for
setting up the proper stack and whatever else MD needs.

Extract crti.S and crtn. from the old dot_init.h files. Prepare other
platforms that use the 6-argument form of __(_)start for this.

Rewrite the crtbegin and crtend modules in assembler to make them
compiler independent. Document the interface in README.

Undo previous; breaks macppc/m68k (at least)

Avoid duplicate definitions on arm (reported by kre@)

Allow both array and non-array constructors for transition.

branches: 1.14.4;
.eh_frame should be read-only on MIPS too.

branches: 1.13.8;
For some mind-boogling reasons, GCC 5.4 believes that a weak reference
cannot alias with an extern. While this is clearly bogus, avoid yet
another alias handling bug and use strong aliases. It's actually
slightly simpler, too.

Fun fact of the weak: a weak reference doesn't have visibility attached.
As such, reorganize the start/end references to use a weak reference
only, if we use it to remove size knowledge. Otherwise use weak
external declarations.

Make older GCC and Clang happy and use weak references to the elements,
not declared as arrays.

PR toolchain/51121:
__CTOR_LIST__ and __CTOR_LIST_END__ are logically the same object, but
due to the start marker, the former has to be declared as array of fixed
size. Newer GCC versions take the liberty of exploiting the UB of
accessing global objects past the end to unconditionally load zero
values in that case. Two fixes are possible:
(1) Pruning via inline assembler as done by GCC's own CRT copy.
(2) Pruning via weak references as done for linker sets.
Since the second part is known and required to work anyway, prefer this
approach. In theory, the labels could be replaced completely, except
that GNU as doesn't provide start/end symbols for sections containing
dots.

branches: 1.9.2; 1.9.6;
Make EHABI optional.

branches: 1.8.2;
Also make sure the __CTOR_LIST__ is just aligned to a pointer boundary.
By default, mips N32 will aligned to a 64-bit boundary not 32-bit
which causes an extra NULL entry to be added.
Fix "segfault on exit" several people have noticed on mips N32,
caused by a jr to a NULL address.

Make sure the __CTOR_LIST__ is just aligned to a pointer boundary.
By default, mips N32 will aligned to a 64-bit boundary not 32-bit
which causes an extra NULL entry to be added.

Include crtbegin.h first to make it possible to build with the stricter
attribute consistency checks in clang.

MIPS wants a read/write eh_frame.

Put the ctors code in .text.startup and dtors code in .text.exit

Switch arm, earm, powerpc to use crtbegin.c
Use -fpie for crtbegin.

Make dwarf_eh_object is 8 words long

Add a common crtbegin.c file and use a machine dependent crtbegin.h to
fill in .init/.fini.
Add mips support for USE_COMPILERCRTSTUFF=no (compiled only)

declare _libc_init() in header.

Instead of compiling files with -fcommon, create an include file and declare
the 3 symbols that need to be common using an attribute. Put all the 3 symbol
definitions in libc in one place (initfini.c). Reviewed by joerg@

Ensure notes are properly padded to 32bit length.

branches: 1.2.2;
Add support for a NetBSD MARCH elf note to record the MACHINE_ARCH for
which a program was compiled.

branches: 1.1.6; 1.1.12;
Switch i386 and x86_64 to the new CRT layout. The crt0.c body is shared
between all platforms and a small assembler stub in crt0.S is used for
setting up the proper stack and whatever else MD needs.

Extract crti.S and crtn. from the old dot_init.h files. Prepare other
platforms that use the 6-argument form of __(_)start for this.

Rewrite the crtbegin and crtend modules in assembler to make them
compiler independent. Document the interface in README.

On sparc64: create additional "marker" object files, that can be used by the
compiler to encode the used code model in binaries.

MARCH note is conditional

Add support for a NetBSD MARCH elf note to record the MACHINE_ARCH for
which a program was compiled.

branches: 1.1.6; 1.1.12;
Switch i386 and x86_64 to the new CRT layout. The crt0.c body is shared
between all platforms and a small assembler stub in crt0.S is used for
setting up the proper stack and whatever else MD needs.

Extract crti.S and crtn. from the old dot_init.h files. Prepare other
platforms that use the 6-argument form of __(_)start for this.

Rewrite the crtbegin and crtend modules in assembler to make them
compiler independent. Document the interface in README.