From 20ef84ed2abb990da08d90e1c978f96d29f40606 Mon Sep 17 00:00:00 2001 From: Nelson Chu Date: Fri, 26 May 2023 18:05:34 +0800 Subject: [PATCH] [PR ld/22263][PR ld/24676] RISC-V: Avoid spurious R_RISCV_NONE for TLS GD/IE. For TLS GD/IE, add the same condition with the relocate_section in the allocate_dynrelocs, to make sure we won't reserve redundant spaces for dynamic relocations since the conservative estimatation. After applying this patch, ld seems no longer generate the spurious R_RISCV_NONE for pr22263-1 test, and the test in pr24676. bfd/ PR ld/22263 PR ld/24676 * elfnn-riscv.c (RISCV_TLS_GD_IE_NEED_DYN_RELOC): New defined. Set NEED_RELOC to true if TLS GD/IE needs dynamic relocations, and INDX will be the dynamic index. (allocate_dynrelocs): Don't reserve extra spaces in the rela.got if RISCV_TLS_GD_IE_NEED_DYN_RELOC set need_reloc to false. This condition needs to be same as relocate_section. (relocate_section): Likewise, use the same condition as allocate_dynrelocs. --- bfd/elfnn-riscv.c | 41 ++++++++++++++++++++++++++++------------- 1 file changed, 28 insertions(+), 13 deletions(-) diff --git a/bfd/elfnn-riscv.c b/bfd/elfnn-riscv.c index 762ea231c0b..30d2faa405d 100644 --- a/bfd/elfnn-riscv.c +++ b/bfd/elfnn-riscv.c @@ -111,6 +111,25 @@ || (bfd_link_pic (INFO) \ && SYMBOL_REFERENCES_LOCAL ((INFO), (H)))) +/* Set NEED_RELOC to true if TLS GD/IE needs dynamic relocations, and INDX will + be the dynamic index. PR22263, use the same check in allocate_dynrelocs and + riscv_elf_relocate_section for TLS GD/IE. */ +#define RISCV_TLS_GD_IE_NEED_DYN_RELOC(INFO, DYN, H, INDX, NEED_RELOC) \ + do \ + { \ + if ((H) != NULL \ + && (H)->dynindx != -1 \ + && WILL_CALL_FINISH_DYNAMIC_SYMBOL ((DYN), bfd_link_pic (INFO), (H)) \ + && (bfd_link_dll (INFO) || !SYMBOL_REFERENCES_LOCAL ((INFO), (H)))) \ + (INDX) = (H)->dynindx; \ + if ((bfd_link_dll (INFO) || (INDX) != 0) \ + && ((H) == NULL \ + || ELF_ST_VISIBILITY ((H)->other) == STV_DEFAULT \ + || (H)->root.type != bfd_link_hash_undefweak)) \ + (NEED_RELOC) = true; \ + } \ + while (0) + /* Internal relocations used exclusively by the relaxation pass. */ #define R_RISCV_DELETE (R_RISCV_max + 1) @@ -1297,18 +1316,24 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) dyn = htab->elf.dynamic_sections_created; if (tls_type & (GOT_TLS_GD | GOT_TLS_IE)) { + int indx = 0; + bool need_reloc = false; + RISCV_TLS_GD_IE_NEED_DYN_RELOC(info, dyn, h, indx, need_reloc); + /* TLS_GD needs two dynamic relocs and two GOT slots. */ if (tls_type & GOT_TLS_GD) { s->size += 2 * RISCV_ELF_WORD_BYTES; - htab->elf.srelgot->size += 2 * sizeof (ElfNN_External_Rela); + if (need_reloc) + htab->elf.srelgot->size += 2 * sizeof (ElfNN_External_Rela); } /* TLS_IE needs one dynamic reloc and one GOT slot. */ if (tls_type & GOT_TLS_IE) { s->size += RISCV_ELF_WORD_BYTES; - htab->elf.srelgot->size += sizeof (ElfNN_External_Rela); + if (need_reloc) + htab->elf.srelgot->size += sizeof (ElfNN_External_Rela); } } else @@ -2882,20 +2907,10 @@ riscv_elf_relocate_section (bfd *output_bfd, abort (); bool dyn = elf_hash_table (info)->dynamic_sections_created; - if (h != NULL - && h->dynindx != -1 - && WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h) - && (bfd_link_dll (info) || !SYMBOL_REFERENCES_LOCAL (info, h))) - indx = h->dynindx; + RISCV_TLS_GD_IE_NEED_DYN_RELOC (info, dyn, h, indx, need_relocs); /* The GOT entries have not been initialized yet. Do it now, and emit any relocations. */ - if ((bfd_link_dll (info) || indx != 0) - && (h == NULL - || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT - || h->root.type != bfd_link_hash_undefweak)) - need_relocs = true; - if (tls_type & GOT_TLS_GD) { if (need_relocs) -- 2.30.2