[PPC32] Emit R_PPC_GOT_TPREL16 instead R_PPC_GOT_TPREL16_LO
Unlike ppc64, which has ADDISgotTprelHA+LDgotTprelL pairs, ppc32 just
uses LDgotTprelL32, so it does not make lots of sense to use _LO
without a paired _HA.
Emit R_PPC_GOT_TPREL16 instead R_PPC_GOT_TPREL16_LO to match GCC, and
get better linker relocation check. Note, R_PPC_GOT_TPREL16_{HA,LO}
don't have good linker support:
(a) lld does not support R_PPC_GOT_TPREL16_{HA,LO}.
(b) Top of tree ld.bfd does not support R_PPC_GOT_REL16_HA
Initial-Exec -> Local-Exec relaxation:
// a.o
addis 3, 3, tsd_tls@got@tprel@ha
lwz 3, tsd_tls@got@tprel@l(3)
add 3, 3, tsd_tls@tls
// b.o
.section .tdata,"awT"; .globl tsd_tls; tsd_tls:
// ld/ld-new a.o b.o
internal error, aborting at ../../bfd/elf32-ppc.c:7952 in
ppc_elf_relocate_section
Reviewed By: adalava
Differential Revision: https://reviews.llvm.org/D66925
This allows use of LLD for linking 32-bit static binaries on
FreeBSD/powerpc.
Submitted by: Alfredo Dal'Ava Júnior <alfredo.junior@eldorado.org.br>
617ea2e6c8