LoongArch: Fix the issue of excessive relocation generated by GD and IE
Currently, whether GD and IE generate dynamic relocation is determined by SYMBOL_REFERENCES_LOCAL and bfd_link_executable. This results in dynamic relocations still being generated in some situations where dynamic relocations are not necessary (such as the undefined weak symbol in static links). We use RLARCH_TLS_GD_IE_NEED_DYN_RELOC macros to determine whether GD/IE needs dynamic relocation. If GD/IE requires dynamic relocation, set need_reloc to true and indx to be a dynamic index. At the same time, some test cases were modified to use regular expression matching instead of complete disassembly matching.
This commit is contained in:
Lulu Cai
liuzhensong
parent
7918b183ec
commit
b67a17aa7c
3 changed files with 142 additions and 135 deletions
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@ -159,6 +159,27 @@ struct loongarch_elf_link_hash_table
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|| (R_TYPE) == R_LARCH_TLS_LE64_LO20 \
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|| (R_TYPE) == R_LARCH_TLS_LE64_LO20 \
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|| (R_TYPE) == R_LARCH_TLS_LE64_HI12)
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|| (R_TYPE) == R_LARCH_TLS_LE64_HI12)
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/* If TLS GD/IE need dynamic relocations, INDX will be the dynamic indx,
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and set NEED_RELOC to true used in allocate_dynrelocs and
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loongarch_elf_relocate_section for TLS GD/IE. */
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#define LARCH_TLS_GD_IE_NEED_DYN_RELOC(INFO, DYN, H, INDX, NEED_RELOC) \
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do \
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{ \
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if ((H) != NULL \
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&& (H)->dynindx != -1 \
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&& WILL_CALL_FINISH_DYNAMIC_SYMBOL ((DYN), \
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bfd_link_pic (INFO), (H))) \
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(INDX) = (H)->dynindx; \
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if (((H) == NULL \
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|| ELF_ST_VISIBILITY ((H)->other) == STV_DEFAULT \
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|| (H)->root.type != bfd_link_hash_undefweak) \
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&& (!bfd_link_executable (INFO) \
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|| (INDX) != 0)) \
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(NEED_RELOC) = true; \
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} \
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while (0)
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/* Generate a PLT header. */
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/* Generate a PLT header. */
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static bool
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static bool
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@ -1276,40 +1297,24 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
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h->got.offset = s->size;
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h->got.offset = s->size;
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if (tls_type & (GOT_TLS_GD | GOT_TLS_IE | GOT_TLS_GDESC))
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if (tls_type & (GOT_TLS_GD | GOT_TLS_IE | GOT_TLS_GDESC))
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{
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{
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int indx = 0;
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bool need_reloc = false;
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LARCH_TLS_GD_IE_NEED_DYN_RELOC (info, dyn, h, indx,
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need_reloc);
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/* TLS_GD needs two dynamic relocs and two GOT slots. */
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/* TLS_GD needs two dynamic relocs and two GOT slots. */
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if (tls_type & GOT_TLS_GD)
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if (tls_type & GOT_TLS_GD)
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{
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{
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s->size += 2 * GOT_ENTRY_SIZE;
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s->size += 2 * GOT_ENTRY_SIZE;
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if (bfd_link_executable (info))
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if (need_reloc)
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{
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htab->elf.srelgot->size += 2 * sizeof (ElfNN_External_Rela);
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/* Link exe and not defined local. */
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if (!SYMBOL_REFERENCES_LOCAL (info, h))
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htab->elf.srelgot->size += 2 * sizeof (ElfNN_External_Rela);
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}
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else
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{
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if (SYMBOL_REFERENCES_LOCAL (info, h))
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htab->elf.srelgot->size += sizeof (ElfNN_External_Rela);
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else
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htab->elf.srelgot->size += 2 * sizeof (ElfNN_External_Rela);
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}
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}
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}
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/* TLS_IE needs one dynamic reloc and one GOT slot. */
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/* TLS_IE needs one dynamic reloc and one GOT slot. */
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if (tls_type & GOT_TLS_IE)
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if (tls_type & GOT_TLS_IE)
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{
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{
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s->size += GOT_ENTRY_SIZE;
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s->size += GOT_ENTRY_SIZE;
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if (need_reloc)
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if (bfd_link_executable (info))
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htab->elf.srelgot->size += 2 * sizeof (ElfNN_External_Rela);
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{
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/* Link exe and not defined local. */
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if (!SYMBOL_REFERENCES_LOCAL (info, h))
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htab->elf.srelgot->size += sizeof (ElfNN_External_Rela);
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}
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else
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{
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htab->elf.srelgot->size += sizeof (ElfNN_External_Rela);
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}
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}
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}
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/* TLS_DESC needs one dynamic reloc and two GOT slot. */
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/* TLS_DESC needs one dynamic reloc and two GOT slot. */
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@ -2550,13 +2555,18 @@ loongarch_reloc_is_fatal (struct bfd_link_info *info,
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})
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})
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/* Compute the tp/dtp offset of a tls symbol.
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It is dtp offset in dynamic tls model (gd/ld) and tp
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offset in static tls model (ie/le). Both offsets are
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calculated the same way on LoongArch, so the same
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function is used. */
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static bfd_vma
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static bfd_vma
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tls_dtpoff_base (struct bfd_link_info *info)
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tlsoff (struct bfd_link_info *info, bfd_vma addr)
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{
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{
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/* If tls_sec is NULL, we should have signalled an error already. */
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/* If tls_sec is NULL, we should have signalled an error already. */
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if (elf_hash_table (info)->tls_sec == NULL)
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if (elf_hash_table (info)->tls_sec == NULL)
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return 0;
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return 0;
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return elf_hash_table (info)->tls_sec->vma;
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return addr - elf_hash_table (info)->tls_sec->vma;
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}
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}
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@ -2890,7 +2900,7 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
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is_undefweak, name, "TLS section not be created");
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is_undefweak, name, "TLS section not be created");
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}
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}
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else
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else
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relocation -= elf_hash_table (info)->tls_sec->vma;
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relocation = tlsoff (info, relocation);
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}
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}
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else
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else
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{
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{
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@ -3416,7 +3426,7 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
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case R_LARCH_TLS_LE_HI20_R:
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case R_LARCH_TLS_LE_HI20_R:
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relocation += rel->r_addend;
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relocation += rel->r_addend;
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relocation -= elf_hash_table (info)->tls_sec->vma;
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relocation = tlsoff (info, relocation);
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RELOCATE_TLS_TP32_HI20 (relocation);
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RELOCATE_TLS_TP32_HI20 (relocation);
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break;
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break;
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@ -3599,7 +3609,7 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
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BFD_ASSERT (resolved_local && elf_hash_table (info)->tls_sec);
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BFD_ASSERT (resolved_local && elf_hash_table (info)->tls_sec);
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relocation += rel->r_addend;
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relocation += rel->r_addend;
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relocation -= elf_hash_table (info)->tls_sec->vma;
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relocation = tlsoff (info, relocation);
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break;
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break;
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/* TLS IE LD/GD process separately is troublesome.
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/* TLS IE LD/GD process separately is troublesome.
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@ -3654,71 +3664,72 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
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/* If a tls variable is accessed in multiple ways, GD uses
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/* If a tls variable is accessed in multiple ways, GD uses
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the first two slots of GOT, desc follows with two slots,
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the first two slots of GOT, desc follows with two slots,
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and IE uses one slot at the end. */
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and IE uses one slot at the end. */
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desc_off = 0;
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off = 0;
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if (GOT_TLS_GD_BOTH_P (tls_type))
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if (tls_type & GOT_TLS_GD)
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desc_off = 2 * GOT_ENTRY_SIZE;
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off += 2 * GOT_ENTRY_SIZE;
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desc_off = off;
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ie_off = 0;
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if (tls_type & GOT_TLS_GDESC)
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if (GOT_TLS_GD_BOTH_P (tls_type) && (tls_type & GOT_TLS_IE))
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off += 2 * GOT_ENTRY_SIZE;
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ie_off = 4 * GOT_ENTRY_SIZE;
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ie_off = off;
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else if (GOT_TLS_GD_ANY_P (tls_type) && (tls_type & GOT_TLS_IE))
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ie_off = 2 * GOT_ENTRY_SIZE;
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if ((got_off & 1) == 0)
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if ((got_off & 1) == 0)
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{
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{
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Elf_Internal_Rela rela;
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Elf_Internal_Rela rela;
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asection *relgot = htab->elf.srelgot;
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asection *relgot = htab->elf.srelgot;
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bfd_vma tls_block_off = 0;
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if (SYMBOL_REFERENCES_LOCAL (info, h))
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int indx = 0;
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{
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bool need_reloc = false;
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BFD_ASSERT (elf_hash_table (info)->tls_sec);
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LARCH_TLS_GD_IE_NEED_DYN_RELOC (info, is_dyn, h, indx,
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tls_block_off = relocation
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need_reloc);
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- elf_hash_table (info)->tls_sec->vma;
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}
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if (tls_type & GOT_TLS_GD)
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if (tls_type & GOT_TLS_GD)
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{
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{
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rela.r_offset = sec_addr (got) + got_off;
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if (need_reloc)
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rela.r_addend = 0;
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if (SYMBOL_REFERENCES_LOCAL (info, h))
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{
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{
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/* Local sym, used in exec, set module id 1. */
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/* Dynamic resolved Module ID. */
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if (bfd_link_executable (info))
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rela.r_offset = sec_addr (got) + got_off;
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bfd_put_NN (output_bfd, 1, got->contents + got_off);
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rela.r_addend = 0;
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rela.r_info = ELFNN_R_INFO (indx,R_LARCH_TLS_DTPMODNN);
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bfd_put_NN (output_bfd, 0, got->contents + got_off);
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loongarch_elf_append_rela (output_bfd, relgot, &rela);
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if (indx == 0)
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{
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/* Local symbol, tp offset has been known. */
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BFD_ASSERT (! unresolved_reloc);
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bfd_put_NN (output_bfd,
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tlsoff (info, relocation),
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(got->contents + got_off + GOT_ENTRY_SIZE));
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}
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else
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else
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{
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{
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rela.r_info = ELFNN_R_INFO (0, R_LARCH_TLS_DTPMODNN);
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/* Dynamic resolved block offset. */
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bfd_put_NN (output_bfd, 0,
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got->contents + got_off + GOT_ENTRY_SIZE);
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rela.r_info = ELFNN_R_INFO (indx,
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R_LARCH_TLS_DTPRELNN);
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rela.r_offset += GOT_ENTRY_SIZE;
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loongarch_elf_append_rela (output_bfd, relgot, &rela);
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loongarch_elf_append_rela (output_bfd, relgot, &rela);
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}
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}
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bfd_put_NN (output_bfd, tls_block_off,
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got->contents + got_off + GOT_ENTRY_SIZE);
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}
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}
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/* Dynamic resolved. */
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else
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else
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{
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{
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/* Dynamic relocate module id. */
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/* In a static link or an executable link with the symbol
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rela.r_info = ELFNN_R_INFO (h->dynindx,
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binding locally. Mark it as belonging to module 1. */
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R_LARCH_TLS_DTPMODNN);
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bfd_put_NN (output_bfd, 1, got->contents + got_off);
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loongarch_elf_append_rela (output_bfd, relgot, &rela);
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bfd_put_NN (output_bfd, tlsoff (info, relocation),
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got->contents + got_off + GOT_ENTRY_SIZE);
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/* Dynamic relocate offset of block. */
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rela.r_offset += GOT_ENTRY_SIZE;
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rela.r_info = ELFNN_R_INFO (h->dynindx,
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R_LARCH_TLS_DTPRELNN);
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loongarch_elf_append_rela (output_bfd, relgot, &rela);
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}
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}
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}
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}
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if (tls_type & GOT_TLS_GDESC)
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if (tls_type & GOT_TLS_GDESC)
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{
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{
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/* Unless it is a static link, DESC always emits a
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/* Unless it is a static link, DESC always emits a
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dynamic relocation. */
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dynamic relocation. */
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int indx = h && h->dynindx != -1 ? h->dynindx : 0;
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indx = h && h->dynindx != -1 ? h->dynindx : 0;
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rela.r_offset = sec_addr (got) + got_off + desc_off;
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rela.r_offset = sec_addr (got) + got_off + desc_off;
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rela.r_addend = 0;
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rela.r_addend = 0;
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if (indx == 0)
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if (indx == 0)
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rela.r_addend = relocation - tls_dtpoff_base (info);
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rela.r_addend = tlsoff (info, relocation);
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rela.r_info = ELFNN_R_INFO (indx, R_LARCH_TLS_DESCNN);
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rela.r_info = ELFNN_R_INFO (indx, R_LARCH_TLS_DESCNN);
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loongarch_elf_append_rela (output_bfd, relgot, &rela);
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loongarch_elf_append_rela (output_bfd, relgot, &rela);
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@ -3727,28 +3738,24 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
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}
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}
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if (tls_type & GOT_TLS_IE)
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if (tls_type & GOT_TLS_IE)
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{
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{
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rela.r_offset = sec_addr (got) + got_off + ie_off;
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if (need_reloc)
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if (SYMBOL_REFERENCES_LOCAL (info, h))
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{
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{
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/* Local sym, used in exec, set module id 1. */
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bfd_put_NN (output_bfd, 0,
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if (!bfd_link_executable (info))
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got->contents + got_off + ie_off);
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{
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rela.r_offset = sec_addr (got) + got_off + ie_off;
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rela.r_info = ELFNN_R_INFO (0, R_LARCH_TLS_TPRELNN);
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rela.r_addend = 0;
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rela.r_addend = tls_block_off;
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loongarch_elf_append_rela (output_bfd, relgot, &rela);
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}
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bfd_put_NN (output_bfd, tls_block_off,
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if (indx == 0)
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got->contents + got_off + ie_off);
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rela.r_addend = tlsoff (info, relocation);
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rela.r_info = ELFNN_R_INFO (indx, R_LARCH_TLS_TPRELNN);
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loongarch_elf_append_rela (output_bfd, relgot, &rela);
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}
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}
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/* Dynamic resolved. */
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else
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else
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{
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{
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/* Dynamic relocate offset of block. */
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/* In a static link or an executable link with the symbol
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rela.r_info = ELFNN_R_INFO (h->dynindx,
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bindinglocally, compute offset directly. */
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R_LARCH_TLS_TPRELNN);
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bfd_put_NN (output_bfd, tlsoff (info, relocation),
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rela.r_addend = 0;
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got->contents + got_off + ie_off);
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loongarch_elf_append_rela (output_bfd, relgot, &rela);
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}
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}
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}
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}
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}
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}
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@ -3787,7 +3794,7 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
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tls_type = _bfd_loongarch_elf_tls_type (input_bfd, h, r_symndx);
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tls_type = _bfd_loongarch_elf_tls_type (input_bfd, h, r_symndx);
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/* Use both TLS_GD and TLS_DESC. */
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/* Use both TLS_GD and TLS_DESC. */
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if ((tls_type & GOT_TLS_GD) && (tls_type & GOT_TLS_GDESC))
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if (GOT_TLS_GD_BOTH_P (tls_type))
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relocation += 2 * GOT_ENTRY_SIZE;
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relocation += 2 * GOT_ENTRY_SIZE;
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if (r_type == R_LARCH_TLS_DESC64_PC_LO20)
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if (r_type == R_LARCH_TLS_DESC64_PC_LO20)
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@ -9,6 +9,6 @@ Disassembly of section .text:
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[0-9a-f]+ <fn1>:
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[0-9a-f]+ <fn1>:
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+[0-9a-f]+: 1a000084 pcalau12i \$a0, .*
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+[0-9a-f]+: 1a000084 pcalau12i \$a0, .*
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+[0-9a-f]+: 28cca084 ld.d \$a0, \$a0, .*
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+[0-9a-f]+: 28cd0084 ld.d \$a0, \$a0, .*
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+[0-9a-f]+: 1a000084 pcalau12i \$a0, .*
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+[0-9a-f]+: 1a000084 pcalau12i \$a0, .*
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+[0-9a-f]+: 28cca084 ld.d \$a0, \$a0, .*
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+[0-9a-f]+: 28cd0084 ld.d \$a0, \$a0, .*
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@ -8,53 +8,53 @@
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Disassembly of section .text:
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Disassembly of section .text:
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0+448 <fun_gl1>:
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[0-9a-f]+ <fun_gl1>:
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448: 18021584 pcaddi \$a0, 4268
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+[0-9a-f]+: 18021584 pcaddi \$a0, 4268
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44c: 1a000084 pcalau12i \$a0, 4
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+[0-9a-f]+: 1a000084 pcalau12i \$a0, 4
|
||||||
450: 28dc2084 ld.d \$a0, \$a0, 1800
|
+[0-9a-f]+: 28dd4084 ld.d \$a0, \$a0, 1872
|
||||||
454: 18021364 pcaddi \$a0, 4251
|
+[0-9a-f]+: 18021364 pcaddi \$a0, 4251
|
||||||
458: 180213c4 pcaddi \$a0, 4254
|
+[0-9a-f]+: 180213c4 pcaddi \$a0, 4254
|
||||||
45c: 28c00081 ld.d \$ra, \$a0, 0
|
+[0-9a-f]+: 28c00081 ld.d \$ra, \$a0, 0
|
||||||
460: 4c000021 jirl \$ra, \$ra, 0
|
+[0-9a-f]+: 4c000021 jirl \$ra, \$ra, 0
|
||||||
464: 1a000084 pcalau12i \$a0, 4
|
+[0-9a-f]+: 1a000084 pcalau12i \$a0, 4
|
||||||
468: 28dae084 ld.d \$a0, \$a0, 1720
|
+[0-9a-f]+: 28dc0084 ld.d \$a0, \$a0, 1792
|
||||||
46c: 1a000084 pcalau12i \$a0, 4
|
+[0-9a-f]+: 1a000084 pcalau12i \$a0, 4
|
||||||
470: 28dae084 ld.d \$a0, \$a0, 1720
|
+[0-9a-f]+: 28dc0084 ld.d \$a0, \$a0, 1792
|
||||||
474: 18021364 pcaddi \$a0, 4251
|
+[0-9a-f]+: 18021364 pcaddi \$a0, 4251
|
||||||
478: 18021344 pcaddi \$a0, 4250
|
+[0-9a-f]+: 180213c4 pcaddi \$a0, 4254
|
||||||
47c: 28c00081 ld.d \$ra, \$a0, 0
|
+[0-9a-f]+: 28c00081 ld.d \$ra, \$a0, 0
|
||||||
480: 4c000021 jirl \$ra, \$ra, 0
|
+[0-9a-f]+: 4c000021 jirl \$ra, \$ra, 0
|
||||||
484: 1a000084 pcalau12i \$a0, 4
|
+[0-9a-f]+: 1a000084 pcalau12i \$a0, 4
|
||||||
488: 28dbc084 ld.d \$a0, \$a0, 1776
|
+[0-9a-f]+: 28dce084 ld.d \$a0, \$a0, 1848
|
||||||
|
|
||||||
0+48c <fun_lo>:
|
[0-9a-f]+ <fun_lo>:
|
||||||
48c: 1a000084 pcalau12i \$a0, 4
|
+[0-9a-f]+: 1a000084 pcalau12i \$a0, 4
|
||||||
490: 28d98084 ld.d \$a0, \$a0, 1632
|
+[0-9a-f]+: 28daa084 ld.d \$a0, \$a0, 1704
|
||||||
494: 18020de4 pcaddi \$a0, 4207
|
+[0-9a-f]+: 18020de4 pcaddi \$a0, 4207
|
||||||
498: 18020f04 pcaddi \$a0, 4216
|
+[0-9a-f]+: 18020f04 pcaddi \$a0, 4216
|
||||||
49c: 28c00081 ld.d \$ra, \$a0, 0
|
+[0-9a-f]+: 28c00081 ld.d \$ra, \$a0, 0
|
||||||
4a0: 4c000021 jirl \$ra, \$ra, 0
|
+[0-9a-f]+: 4c000021 jirl \$ra, \$ra, 0
|
||||||
4a4: 18020e24 pcaddi \$a0, 4209
|
+[0-9a-f]+: 18020e24 pcaddi \$a0, 4209
|
||||||
4a8: 1a000084 pcalau12i \$a0, 4
|
+[0-9a-f]+: 1a000084 pcalau12i \$a0, 4
|
||||||
4ac: 28da2084 ld.d \$a0, \$a0, 1672
|
+[0-9a-f]+: 28db4084 ld.d \$a0, \$a0, 1744
|
||||||
4b0: 1a000084 pcalau12i \$a0, 4
|
+[0-9a-f]+: 1a000084 pcalau12i \$a0, 4
|
||||||
4b4: 28da2084 ld.d \$a0, \$a0, 1672
|
+[0-9a-f]+: 28db4084 ld.d \$a0, \$a0, 1744
|
||||||
4b8: 18020ec4 pcaddi \$a0, 4214
|
+[0-9a-f]+: 18020f44 pcaddi \$a0, 4218
|
||||||
4bc: 28c00081 ld.d \$ra, \$a0, 0
|
+[0-9a-f]+: 28c00081 ld.d \$ra, \$a0, 0
|
||||||
4c0: 4c000021 jirl \$ra, \$ra, 0
|
+[0-9a-f]+: 4c000021 jirl \$ra, \$ra, 0
|
||||||
4c4: 18020e64 pcaddi \$a0, 4211
|
+[0-9a-f]+: 18020e64 pcaddi \$a0, 4211
|
||||||
4c8: 1a000084 pcalau12i \$a0, 4
|
+[0-9a-f]+: 1a000084 pcalau12i \$a0, 4
|
||||||
4cc: 28da8084 ld.d \$a0, \$a0, 1696
|
+[0-9a-f]+: 28dba084 ld.d \$a0, \$a0, 1768
|
||||||
|
|
||||||
0+4d0 <fun_external>:
|
[0-9a-f]+ <fun_external>:
|
||||||
4d0: 18020ec4 pcaddi \$a0, 4214
|
+[0-9a-f]+: 18020ec4 pcaddi \$a0, 4214
|
||||||
4d4: 28c00081 ld.d \$ra, \$a0, 0
|
+[0-9a-f]+: 28c00081 ld.d \$ra, \$a0, 0
|
||||||
4d8: 4c000021 jirl \$ra, \$ra, 0
|
+[0-9a-f]+: 4c000021 jirl \$ra, \$ra, 0
|
||||||
|
|
||||||
0+4dc <fun_hidden>:
|
[0-9a-f]+ <fun_hidden>:
|
||||||
4dc: 18021224 pcaddi \$a0, 4241
|
+[0-9a-f]+: 18021224 pcaddi \$a0, 4241
|
||||||
4e0: 28c00081 ld.d \$ra, \$a0, 0
|
+[0-9a-f]+: 28c00081 ld.d \$ra, \$a0, 0
|
||||||
4e4: 4c000021 jirl \$ra, \$ra, 0
|
+[0-9a-f]+: 4c000021 jirl \$ra, \$ra, 0
|
||||||
4e8: 18021144 pcaddi \$a0, 4234
|
+[0-9a-f]+: 18021144 pcaddi \$a0, 4234
|
||||||
4ec: 28c00081 ld.d \$ra, \$a0, 0
|
+[0-9a-f]+: 28c00081 ld.d \$ra, \$a0, 0
|
||||||
4f0: 4c000021 jirl \$ra, \$ra, 0
|
+[0-9a-f]+: 4c000021 jirl \$ra, \$ra, 0
|
||||||
|
|
|
||||||
Loading…
Add table
Add a link
Reference in a new issue