initfini array support for everyone.

branches: 1.21.2;
Rework ifunc support to address a number of short comings:
- Move to a shared _rtld_call_ifunc for rel and rela architectures
- Architectures using rel format must patch IRELATIVE non-PLT
relocations like RELATIVE in additition to the later ifunc handling
- Consistently record the delta to the end of the relocation group for
non-PLT IRELATIVE relocations

Hidden ifunc is now supported on all ifunc platforms, even when using
-fno-plt. The combination of -fno-plt and relro is broken due to
incorrect GNU ld output though.

branches: 1.20.24;
For earm, emit a MARCH note.

Consistently use LDELFSO_MACHINE_ARCH.

Provide a default LDELFSO_MACHINE_ARCH. hi matt!

atf-run works again - the init/fini stuff didn't get run otherwise.

Changes for MKCOMPAT for earm.

Add support for PT_ARM_EXIDX and __gnu_Unwind_Find_exidx for libgcc's support
of the ARM EHABI.

Handle CPUFLAGS being empty

Make sure CFLAGS is not empty.

If you are using aapcs, you must be using INITFINI

branches: 1.12.2;
Add .init_array/.fini_array support (conditionalized on HAVE_INITFINI_ARRAY).

branches: 1.11.42; 1.11.46;
Explicitly prefix ld(1) options in LDFLAGS with "-Wl," rather than
using the ${LDFLAGS:@F@-Wl,$F@} make substitution because that breaks
if LDFLAGS is already set.

Move common LDFLAGS into Makefile from arch/*/Makefile.inc

Whitespace.

Remove vestiges of VARPSZ.

Do the _rtld_relocate_nonplt_self() thing here, and nuke the ld script.

Only one linker script is needed.

Nuke RTLD_RELOCATE_SELF on ARM.

Make _rtld_setup_pltgot() a consistent interface on all platforms.

branches: 1.3.2;
Grumble. Put compiler options back into CPPFLAGS for now, since
they're needed to build .S files with the correct PIC options.

XXX Really needs cleanup in <bsd.*.mk> to do this properly.

Don't put compiler options into CPPFLAGS.

Initial support for dynamic ELF support on ARM.

Don't provide __gnu_Unwind_Find_exidx if __ARM_DWARF_EH__ is defined

branches: 1.3.2; 1.3.8;
Remove trailing whitespace

Use relocbase, not mapbase.

Add a ld.elf_so internals version of __gnu_Unwind_Find_exidx for that the
libgcc EHABI can find the exception tables for a supplied PC.

Do the _rtld_relocate_nonplt_self() thing here, and nuke the ld script.

Only one linker script is needed.

Only one linker script is needed.

Nuke RTLD_RELOCATE_SELF on ARM.

Only one linker script is needed.

Nuke RTLD_RELOCATE_SELF on ARM.

ld.elf_so(1): Nix trailing whitespace.

No functional change intended.

ld.elf_so: Cite reference for Arm ELF relocations.

PR lib/58455: Missing references for processor-specific ELF
relocation semantics

branches: 1.46.2;
Fix interactions of initial-exec TLS model and dlopen

(1) If an initial-exec relocation was used for a non-local symbol
(i.e. the definition of the symbol is in a different DSO), the
computation of the static TLS offset used the wrong DSO.
This would effectively mean the wrong address was computed
(PR toolchain/50277, PR pkg/57445).

Fix this by forcing the computation of the correct DSO (the one defining
the symbol).

This code uses __UNCONST to avoid the vast interface changes for this
special case.

(2) If symbols from a DSO loaded via dlopen are used with both
global-dynamic/local-dynamic and initial-exec relocations AND
a initial-exec relocation was resolved first in a thread, a split brain
situation could exist where the dynamic relocations would use one memory
block (separate allocation) and the initial-exec relocations the static
per-thread TLS space.

(3) If the initial-exec relocation in (2) is seen after any thread has
already used a GD/LD allocation, bail out. Since IE relocations are used
only in the GOT, this will prevent the dlopen. This is a bit more
aggressive than necessary, but a full blown reference counting doesn't
seem to be justified.

branches: 1.45.6;
R_ARM_TLS_TPOFF32 needs to adjust the existing value, not blindly
overwrite it.

branches: 1.44.4;
Rework ifunc support to address a number of short comings:
- Move to a shared _rtld_call_ifunc for rel and rela architectures
- Architectures using rel format must patch IRELATIVE non-PLT
relocations like RELATIVE in additition to the later ifunc handling
- Consistently record the delta to the end of the relocation group for
non-PLT IRELATIVE relocations

Hidden ifunc is now supported on all ifunc platforms, even when using
-fno-plt. The combination of -fno-plt and relro is broken due to
incorrect GNU ld output though.

branches: 1.43.2;
init/fini for the main program is handled by crt0.o, so ifunc handling
is skipped right now as it iterates the same list. Don't repeat that
mistake and explicitly take care of it in the dynamic linker.

Add IRELATIVE support for ARM, X86 and PowerPC.

Expand symnum, GCC's uninitialized used tracking is too imprecise.

Drop symbol number from default branch diagnostic, it isn't set at this
point and most likely not valid either.

Replace COMBREL with just-in-time check in _rtld_relocate_nonplt_objects.

The COMBREL logic predates thread-safety of the dynamic linker and
breaks the use of shared locks for the common symbol lookup case. It is
unlikely to provide any benefit for lazy binding or PLT lookups, so
provide equivalent functionality in the non-PLT relocation handling loop
by checking if the symbol used by the current relocation is the same as
the one used during the last lookup. No inter-object cachine is done as
it is also unlikely to be benefical.

Testing with Firefox startup on AMD64 shows a small performance gain by
the new method.

branches: 1.38.8;
Add basic support for indirect functions. It allows providing a public
function symbol with an implementation choosen at run time.
Refactor calls to functions by address in ld.elf_so to create temporary
function descriptors on the stack, if the address is not leaked outside.

Limitations:
- no support for initialising static storage with function pointers
- no support for unnamed resolver functions

Inspired by FreeBSD's r228435 by kib@freebsd.org.

branches: 1.37.18;
Hook up TLS support on ARM. Tested by martin@, kernel support from matt@

branches: 1.36.4;
Add support for TLS relocations.
From Joerg Sonnenberger

Add basic locking to ld.elf_so.

Reduce header pollution for mdreloc.c. Make Obj_Entry argument of
_rtld_relocate_nonplt_objects non-const in preparation for TLS support.

Make DEBUG build compile.

Shut gcc up.

PR/39240: Satoshi Suetake: Don't fail when attempting to resolve weak symbols
when we are doing immediate binding, leave them alone and they will be dealt
with later during lazy binding. From skrll@

Remove trailing \n in calls to _rtld_error: a newline is automatically
added by a call to the function.

Fix const issues (cast const pointers to "const uint8_t *" instead of "caddr_t")

NOTE: change based on ../i386/mdreloc.c 1.27
XXX: not compile tested

branches: 1.28.4; 1.28.6;
Refactor common code to _rtld_relocate_plt_object to i386 and arm so they
act like the other versions.
In _rtld_bind, if the result is 0, call _rtld_die.
Initialize _rtld_sym_zero.st_value to -_rtld_objself.maprelocbase. Now when
the symbol is resolved, st_value + maprelocbase will equal 0 and the above
check in _rtld_bind will fire and a call to NULL will be avoided.

branches: 1.27.20;
Remove leading __ from __(const|inline|signed|volatile) -- it is obsolete.

Add __RCSID.

ELF32_ST_TYPE -> ELF_ST_TYPE

Check the type of symbols; if it's a Thumb function, then set the Thumb
bit in the relocated value (JUMP_SLOT, ABS32 & GLOB_DAT).

branches: 1.23.4;
include <string.h> or <stdlib.h> for all prototypes

ANSIfy and de-__P().

Support immediate binding on arm.

Skip the lazy PLT relocation if relocbase==0 (useful if libraries are loaded
at their VMA address).

Remove the `self' args to _rtld_relocate_objects() and
_rtld_relocate_nonplt_objects().

Push the _rtld_bind() interface into MD code -- it's just a trivial wrapper
anyway.

No PC24 relocs will ever be unaligned. Pointed out by mycroft.

It is possible for reloc entries to point to unaligned locations; handle
this.

Use the addend on GLOB_DAT relocs (same as ABS32).

Nuke -DRTLD_RELOCATE_SELF and `dodebug' from orbit.

_rtld_bind_start() is not used in MI code, so declare it in the MD code.

Do the _rtld_relocate_nonplt_self() thing here, and nuke the ld script.

Add $NetBSD$.

Nuke RTLD_RELOCATE_SELF on ARM.

Pass down an additional flag to _rtld_relocate_nonplt_objects() which
indicates whether we're relocating ld.elf_so itself. Use this in some places
rather than hackish tests on `dodebug'. (The Alpha and HPPA `dodebug' tests
were actually noops, because RTLD_RELOCATE_SELF is not set, and therefore
dodebug is always true.)

Introduce a new flag, `isdynamic', which is used to remember whether the
executable was of type ET_DYN. Use this instead of `mainprog' to determine
whether we need to do base-relative fixups of the PLT. (This allows loading
non-relocatable objects, should we desire to do that at some point...)

Re-poison a lot of consts, now that the mark shite is gone.

Split _rtld_relocate_plt_object() into two MD functions:
* _rtld_relocate_plt_lazy() fixes up all the relocs pointing to the PLT. (On
most platforms it just does a simple base-relative fixup; on SPARC it does
nothing.)
* _rtld_relocate_plt_object() does immediate binding for a PLT entry.
The basic gist is that this saves a bit of time on SPARC (where the iteration
through the pltrela table was gratuitous), and a little less time on all other
platforms. A whole lot of #ifdef'ed crap is moved out of reloc.c, too.

NOT tested on: hppa sh x86_64

Partially fix up some debug printf()s that don't need to use defobj.

A few things:
* Pass a symbol number to _rtld_find_symdef(), not a r_info.
* Don't try to do a symbol lookup when we find an unsupported relocation;
instead get the symbol name from the referencing object's strtab.
* Add preliminary support for `-z combreloc'-style startup optimization on
i386, `#ifdef COMBRELOC'.

Rename _rtld_relocate_nonplt_object() to _rtld_relocate_nonplt_objects(),
and push the outer loop into it. This actually shaves a couple % off startup
time at least on PCs.

Split _rtld_relocate_nonplt_object() into separate MD files.

Make _rtld_setup_pltgot() a consistent interface on all platforms.

Don't use GOT relocations. Use PC relative for the GOT and GOTOFF for
_DYNAMIC. Make thumb friendly.

branches: 1.11.2;
Add a comment for EABI. Use "pop" instructions to save one instruction.

branches: 1.10.6; 1.10.10;
Add RCSID

Remove clause 3 and 4 from TNF licenses

branches: 1.8.24;
Use BX if available.

Update comments.

Pass the calculated relocation offset down to _rtld().

Do the _rtld_relocate_nonplt_self() thing here, and nuke the ld script.

Nuke RTLD_RELOCATE_SELF on ARM.

branches: 1.3.2;
Fix binder routine to not use a volatile register.

Bugfix for _rtld_start. Enable common plt processing code for arm

Initial support for dynamic ELF support on ARM.