s390: Do not rewrite insns and their relocs in linker if --no-relax
Under certain conditions the linker rewrites:
- GOT access using lgrl to larl, changing the GOTENT to a PC32DBL reloc
- GOT access using lg to larl, changing the GOT20 to a PC32DBL reloc
- Relative long addressing instructions of weak symbols, which
definitively resolve to zero to either (1) load address of zero,
(2) a NOP, or (3) a trapping instruction, changing the relocation to
a NONE reloc.
Suppress rewriting of non-TLS instructions and related relocations in
linker if option --no-relax is specified. This aligns with LLVM linker
behavior on s390.
Like x86-64 do not actually enable the linker relaxation option by
default, as other targets would do using ENABLE_RELAXATION or
TARGET_ENABLE_RELAXATION in their linker emulation scripts. Instead
perform linker instruction/relocation rewrites by default unless linker
option --no-relax is explicitly specified by the user. This ensures no
functional change unless --no-relax is used.
bfd/
* elf64-s390.c (elf_s390_relocate_section): Do not rewrite
non-TLS instructions and related relocations if --no-relax.
* elf32-s390.c (elf_s390_relocate_section): Likewise.
ld/testsuite/
* ld-s390/s390.exp: New tests. Same as gotreloc_*-1a and
weakundef-*a, but with linker option --no-relax, to verify
suppression of linker non-TLS insn and reloc rewrites.
* ld-s390/gotreloc_31-1b.dd: Likewise.
* ld-s390/gotreloc_31-no-pie-1b.dd: Likewise.
* ld-s390/gotreloc_64-no-pie-1b.dd: Likewise.
* ld-s390/gotreloc_64-norelro-1b.dd: Likewise.
* ld-s390/gotreloc_64-relro-1b.dd: Likewise.
* ld-s390/weakundef-1b.d: Likewise. Check for expected reloc
overflows.
* ld-s390/weakundef-2b.d: Likewise.
Signed-off-by: Jens Remus <jremus@linux.ibm.com>
10 files changed
