ppc64 ld optimises sequences like the following
addis 3,13,wot@tprel@ha
lwz 3,wot@tprel@l(3)
to
nop
lwz 3,wot@tprel(13)
when "wot" is located near enough to the thread pointer.
However, the ABI doesn't require that R_PPC64_TPREL16_HA always be on
an addis rt,13,imm instruction, and while ld checked for that on the
high-part instruction it didn't disable the optimisation on the
low-part instruction. This patch fixes that problem, disabling the
tprel optimisation globally if high-part instructions don't pass
sanity checks. The optimisation is also enabled for ppc32, where
before ld.bfd had the code in the wrong place and ld.gold had it in a
block only enabled for ppc64.
bfd/
* elf32-ppc.c (ppc_elf_check_relocs): Set has_tls_reloc for
high part tprel16 relocs.
(ppc_elf_tls_optimize): Sanity check high part tprel16 relocs.
Clear do_tls_opt on odd instructions.
(ppc_elf_relocate_section): Move TPREL16_HA/LO optimisation later.
Don't sanity check them here.
* elf64-ppc.c (ppc64_elf_check_relocs): Set has_tls_reloc for
high part tprel16 relocs.
(ppc64_elf_tls_optimize): Sanity check high part tprel16 relocs.
Clear do_tls_opt on odd instructions.
(ppc64_elf_relocate_section): Don't sanity check TPREL16_HA.
ld/
* testsuite/ld-powerpc/tls32.d: Update for TPREL_HA/LO optimisation.
* testsuite/ld-powerpc/tlsexe32.d: Likewise.
* testsuite/ld-powerpc/tlsldopt32.d: Likewise.
* testsuite/ld-powerpc/tlsmark32.d: Likewise.
* testsuite/ld-powerpc/tlsopt4_32.d: Likewise.
* testsuite/ld-powerpc/tprel.s,
* testsuite/ld-powerpc/tprel.d,
* testsuite/ld-powerpc/tprel32.d: New tests.
* testsuite/ld-powerpc/tprelbad.s,
* testsuite/ld-powerpc/tprelbad.d: New test.
* testsuite/ld-powerpc/powerpc.exp: Run them.
gold/
* powerpc.cc (Target_powerpc): Add tprel_opt_ and accessors.
(Target_powerpc::Scan::local): Sanity check tprel high relocs.
(Target_powerpc::Scan::global): Likewise.
(Target_powerpc::Relocate::relocate): Control tprel optimisation
with tprel_opt_ and enable for 32-bit.
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README for LD
This is the GNU linker. It is distributed with other "binary
utilities" which should be in ../binutils. See ../binutils/README for
more general notes, including where to send bug reports.
There are many features of the linker:
* The linker uses a Binary File Descriptor library (../bfd)
that it uses to read and write object files. This helps
insulate the linker itself from the format of object files.
* The linker supports a number of different object file
formats. It can even handle multiple formats at once:
Read two input formats and write a third.
* The linker can be configured for cross-linking.
* The linker supports a control language.
* There is a user manual (ld.texi), as well as the
beginnings of an internals manual (ldint.texi).
Installation
============
See ../binutils/README.
If you want to make a cross-linker, you may want to specify
a different search path of -lfoo libraries than the default.
You can do this by setting the LIB_PATH variable in ./Makefile
or using the --with-lib-path configure switch.
To build just the linker, make the target all-ld from the top level
directory (one directory above this one).
Porting to a new target
=======================
See the ldint.texi manual.
Reporting bugs etc
===========================
See ../binutils/README.
Known problems
==============
The Solaris linker normally exports all dynamic symbols from an
executable. The GNU linker does not do this by default. This is
because the GNU linker tries to present the same interface for all
similar targets (in this case, all native ELF targets). This does not
matter for normal programs, but it can make a difference for programs
which try to dlopen an executable, such as PERL or Tcl. You can make
the GNU linker export all dynamic symbols with the -E or
--export-dynamic command line option.
HP/UX 9.01 has a shell bug that causes the linker scripts to be
generated incorrectly. The symptom of this appears to be "fatal error
- scanner input buffer overflow" error messages. There are various
workarounds to this:
* Build and install bash, and build with "make SHELL=bash".
* Update to a version of HP/UX with a working shell (e.g., 9.05).
* Replace "(. ${srcdir}/scripttempl/${SCRIPT_NAME}.sc)" in
genscripts.sh with "sh ${srcdir}..." (no parens) and make sure the
emulparams script used exports any shell variables it sets.
Copyright (C) 2012-2020 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.
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