Fix the start symbol.

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.

Fix the dynamic linker for hppa using ELF.

Lazy binding doesn't work 100% of the time so force immediate binding.
One possible reason is that the PLT stub blows away r20 which the
compiler might not take into account.

Remove the millicode hack - its not needed anymore.

Get the entry point right.

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

Whitespace.

Remove vestiges of VARPSZ.

Add support for dynamic linking on HP PA-RISC.

KNF and remove trailing whitespace in previous.

skip R_PARISC_NONE reloc entries instead of segfaulting on them
now windowmaker runs on my C360

ld.elf_so: Cite reference for HP PA-RISC ELF relocations.

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

branches: 1.50.2;
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: 1.49.2;
Set DP early so that any binary functions that override others get the
right value if they're called before _start. This is true of bash where
it provides its own getenv.

Part of port-hppa/56118: sporadic app crashes in HPPA -current

Restore the fptr_t type of {init,fini}{,_array} that was removed when initial
support for indirect functions was added. This fixes {init,fini}_array support
on hppa where each member of the array is (already) a plabel.

Discussed with joerg.

4 files changed, 29 insertions(+), 39 deletions(-)
: ----------------------------------------------------------------------

Avoid compiler warnings about uninitialised symnum

Trailing whitespace

branches: 1.45.6;
Add IRELATIVE support for ARM, X86 and PowerPC.

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: 1.43.8;
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: 1.42.18;
Implement lazy binding on hppa. rump_server needs it!?!?!

Mostly from OpenBSD.

Use the tlsoffset from the correct object.

branches: 1.40.2;
gcc 4.5 generates an extra plabel in ld.elf_so,
so expand the array of preallocated ones.

Add basic locking to ld.elf_so.

Another TLS reloc. Thanks to joerg for a hint.

More PLABELS are required due to TLS stuff.

Handle some TLS relocs.

Whitespace.

Wrap long lines

Reformat comments.

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

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@

ld.elf_so grew more PLABELS with dlinfo so bump HPPA_PLABEL_PRE.

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

After a recent WARNS= bump on ld.elf_so it fails to build on hppa,
complaining that we're "discarding qualifier from pointer target
type".

Use const char * instead of caddr_t to avoid the warning and get
distribution building on hppa again.

branches: 1.27.4;
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: 1.26.2;
Remove clause 3 and 4 from TNF licenses

branches: 1.25.16;
Create _rtld_relocate_plt_object and use it in _rtld_bind and
_rtld_relocate_plt_objects.

No functional change.

Support unaligned DIR32 relocs.

Closes PR 18293

Add __RCSID.

appease gcc -Wuninitialized on hp700.

Copyright maintenance.

Fix the dynamic linker for hppa using ELF.

Lazy binding doesn't work 100% of the time so force immediate binding.
One possible reason is that the PLT stub blows away r20 which the
compiler might not take into account.

Wrap a couple of lines to <80 columns

Whitespace.

Update to new reality. XXX _rtld_bind still needs to be written.

ANSIfy and de-__P().

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

Nuke -DRTLD_RELOCATE_SELF and `dodebug' from orbit.

Move another declaration that doesn't belong in MI source.

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

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.

Remove unused arguments of _rtld_find_symdef().

Make _rtld_setup_pltgot() a consistent interface on all platforms.

Add support for dynamic linking on HP PA-RISC.

Fix the dynamic linker for hppa using ELF.

Lazy binding doesn't work 100% of the time so force immediate binding.
One possible reason is that the PLT stub blows away r20 which the
compiler might not take into account.

Update to new reality. XXX _rtld_bind still needs to be written.

Add support for dynamic linking on HP PA-RISC.

Remove unused file.

branches: 1.1.4;
First cut at mdtls.c for hppa.

Set DP early so that any binary functions that override others get the
right value if they're called before _start. This is true of bash where
it provides its own getenv.

Part of port-hppa/56118: sporadic app crashes in HPPA -current

Trailing whitespace

branches: 1.12.42;
Implement lazy binding on hppa. rump_server needs it!?!?!

Mostly from OpenBSD.

branches: 1.11.2;
match EXIT() with LEAF_ENTRY() so that sizes are actually constants.
fixes binutils 2.21 build issues reported by he and chuq.

Whitespace.

Add the magic branch instruction that is used by GCC's
__canonicalize_funcptr_for_compare() function to fixup relocations in
order to do function pointer comparisons.

From OpenBSD.

Wrap long lines

Reformat comments.

Small tidyup.

Remove clause 3 and 4 from TNF licenses

branches: 1.5.16;
Reformat a comment.

Correct the frame size for a couple of ENTRYs

Fix the dynamic linker for hppa using ELF.

Lazy binding doesn't work 100% of the time so force immediate binding.
One possible reason is that the PLT stub blows away r20 which the
compiler might not take into account.

Update to new reality. XXX _rtld_bind still needs to be written.

Add support for dynamic linking on HP PA-RISC.