From d66deb71f1537e2e30dccdfda22eed5d46ec47eb Mon Sep 17 00:00:00 2001 From: Alan Modra Date: Wed, 14 Mar 2018 22:09:33 +1030 Subject: [PATCH] PowerPC64 debian bug 886264, out-of-line save/restore functions This calculation in relocate_section if (stub_entry->stub_type == ppc_stub_save_res) relocation += (stub_sec->output_offset + stub_sec->output_section->vma + stub_sec->size - htab->sfpr->size - htab->sfpr->output_offset - htab->sfpr->output_section->vma); to adjust from the original out-of-line save/restore function address in sfpr to a copy at the end of stub_sec goes wrong when stub_sec is padded, because the copy is no longer at the end of stub_sec. The solution is to pad before copying sfpr, so the copy is always at the end of stub_sec. * elf64-ppc.c (sfpr_define): Adjust for stub_sec size having sfpr size added before defining alias symbols. (ppc64_elf_build_stubs): Add stub section padding before copying sfpr contents and defining save/restore alias symbols. (cherry picked from commit 7dda8d3cf3b089bb7e03c4cdbec827fc6a188c88) --- bfd/ChangeLog | 9 +++++++++ bfd/elf64-ppc.c | 33 ++++++++++++++++++--------------- 2 files changed, 27 insertions(+), 15 deletions(-) diff --git a/bfd/elf64-ppc.c b/bfd/elf64-ppc.c index 6fcdff0..039294f 100644 --- a/bfd/elf64-ppc.c +++ b/bfd/elf64-ppc.c @@ -6645,7 +6645,7 @@ sfpr_define (struct bfd_link_info *info, { s->root.type = bfd_link_hash_defined; s->root.u.def.section = stub_sec; - s->root.u.def.value = (stub_sec->size + s->root.u.def.value = (stub_sec->size - htab->sfpr->size + h->elf.root.u.def.value); s->ref_regular = 1; s->def_regular = 1; @@ -13232,20 +13232,7 @@ ppc64_elf_build_stubs (struct bfd_link_info *info, for (group = htab->group; group != NULL; group = group->next) if (group->needs_save_res) - { - stub_sec = group->stub_sec; - memcpy (stub_sec->contents + stub_sec->size, htab->sfpr->contents, - htab->sfpr->size); - if (htab->params->emit_stub_syms) - { - unsigned int i; - - for (i = 0; i < ARRAY_SIZE (save_res_funcs); i++) - if (!sfpr_define (info, &save_res_funcs[i], stub_sec)) - return FALSE; - } - stub_sec->size += htab->sfpr->size; - } + group->stub_sec->size += htab->sfpr->size; if (htab->relbrlt != NULL) htab->relbrlt->reloc_count = 0; @@ -13259,6 +13246,22 @@ ppc64_elf_build_stubs (struct bfd_link_info *info, } for (group = htab->group; group != NULL; group = group->next) + if (group->needs_save_res) + { + stub_sec = group->stub_sec; + memcpy (stub_sec->contents + stub_sec->size - htab->sfpr->size, + htab->sfpr->contents, htab->sfpr->size); + if (htab->params->emit_stub_syms) + { + unsigned int i; + + for (i = 0; i < ARRAY_SIZE (save_res_funcs); i++) + if (!sfpr_define (info, &save_res_funcs[i], stub_sec)) + return FALSE; + } + } + + for (group = htab->group; group != NULL; group = group->next) if ((stub_sec = group->stub_sec) != NULL) { stub_sec_count += 1; -- 2.9.3