[PATCH v4] MIPS support for GNU hash

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[PATCH v4] MIPS support for GNU hash

Mihailo Stojanovic
Hello everyone,

  This patch is a reimplementation of [1] which was submitted in 2015 by
Neil Schellenberger. Copyright issue was sorted out [2] last year.
It proposed a new section (.gnu.xhash) and related dynamic tag
(DT_GNU_XHASH). The new section would be virtually identical to the
existing .gnu.hash except for the translation table (xlat) which would
contain correct MIPS .dynsym indexes corresponding to the hashvals in
chains. This is because MIPS ABI imposes a different ordering on the
dynsyms than the one expected by the .gnu.hash section. Another addition
would be a leading word (ngnusyms) which would contain the number of
entries in the translation table.

  In this patch, the new section name and dynamic tag are changed to
reflect the fact that the section should be treated as MIPS-specific
(.MIPS.xhash and DT_MIPS_XHASH).

  This patch addresses the alignment issue as reported in [3], which is
caused by the leading word added to the .MIPS.xhash section. Leading word
is removed in this patch, and the number of entries in the translation
table is now calculated using DT_MIPS_SYMTABNO dynamic tag (this is
addressed by the corresponding glibc patch).

  Suggestions on coding style in [4] were taken into account. Existing
GNU hash testcase was covered, and another one was added in the MIPS
part of the testsuite.

  The other major change is reserving MIPS ABI version 5 for .MIPS.xhash,
marking the need of support for .MIPS.xhash in the dynamic linker (again,
addressed in the corresponding glibc patch). This is something which I
am not sure of, especially after reading [5]. I am confused on whether
this ABI version is reserved for IFUNC, or it can be used for this
purpose.

Already mentioned glibc patch is submitted at:
https://sourceware.org/ml/libc-alpha/2019-06/msg00456.html

Regards,
Mihailo

[1] https://sourceware.org/ml/binutils/2015-10/msg00057.html
[2] https://sourceware.org/ml/binutils/2018-03/msg00025.html
[3] https://sourceware.org/ml/binutils/2016-01/msg00006.html
[4] https://sourceware.org/ml/binutils/2016-02/msg00097.html
[5] https://sourceware.org/ml/libc-alpha/2016-12/msg00853.html

ld/ChangeLog:

        * emulparams/elf32bmip.sh: Add .MIPS.xhash section.
        * emulparams/elf32bmipn32-defs.sh: Add .MIPS.xhash section.
        * emulparams/elf64bmip-defs.sh: Add .MIPS.xhash section.
        * emultempl/mipself.em: Remove mips_after_parse function.
        * testsuite/ld-elf/hash.d: Update comment.
        * testsuite/ld-mips-elf/hash1.d: New test.
        * testsuite/ld-mips-elf/hash1.s: Ditto.
        * testsuite/ld-mips-elf/hash1a.d: Remove.
        * testsuite/ld-mips-elf/hash1b.d: Ditto.
        * testsuite/ld-mips-elf/hash1c.d: Ditto
        * testsuite/ld-mips-elf/hash2.d: New test.
        * testsuite/ld-mips-elf/mips-elf.exp: New tests.
        * testsuite/ld-mips-elf/start.s: New test.

bfd/ChangeLog:

        * elf-bfd.h (struct elf_backend_data): New members.
        * elflink.c (_bfd_elf_link_create_dynamic_sections): Create
        .gnu.hash section if necessary.
        (struct collect_gnu_hash_codes): New member.
        (elf_gnu_hash_process_symidx): New function name.
        (elf_renumber_gnu_hash_syms): Ignore local and undefined
        symbols. Record xlat location for every symbol which should have
        a .MIPS.xhash entry.
        (bfd_elf_size_dynamic_sections): Add DT_GNU_HASH dynamic tag to
        dynamic section if necessary.
        (GNU_HASH_SECTION_NAME): New define.
        (bfd_elf_size_dynsym_hash_dynstr): Get .MIPS.xhash section.
        Update the section size info.
        * elfxx-mips.c (struct mips_elf_hash_sort_data): New members.
        (struct mips_elf_link_hash_entry): New member.
        (mips_elf_link_hash_newfunc): Initialize .MIPS.xhash translation
        table location.
        (mips_elf_sort_hash_table): Initialize the pointer to the
        .MIPS.xhash section.
        (mips_elf_sort_hash_table_f): Populate the .MIPS.xhash
        translation table entry with the symbol dynindx.
        (_bfd_mips_elf_section_from_shdr): Add SHT_MIPS_XHASH.
        (_bfd_mips_elf_fake_sections): Initialize .MIPS.xhash section
        info.
        (_bfd_mips_elf_create_dynamic_sections): Create .MIPS.xhash
        section.
        (_bfd_mips_elf_size_dynamic_sections): Add DT_MIPS_XHASH tag to
        dynamic section.
        (_bfd_mips_elf_finish_synamic_sections): Add DT_MIPS_XHASH.
        (_bfd_mips_elf_final_write_processing): Set .MIPS.xhash section
        sh_link info.
        (_bfd_mips_elf_get_target_dtag): Get DT_MIPS_XHASH tag.
        (MIPS_LIBC_ABI_XHASH): New ABI version enum value.
        (_bfd_mips_post_process_headers): Mark the ABI version as
        MIPS_LIBC_ABI_XHASH if there exists a .MIPS.xhash section,
        but not a .hash section.
        (_bfd_mips_elf_record_xhash_symbol): New function. Record a
        position in the translation table, associated with the hash
        entry.
        * elfxx-mips.h (literal_reloc_p): Define
        elf_backend_record_xhash_symbol backend hook.
        * elfxx-target.h: Initialize elf_backend_record_xhash_symbol
        backend hook.

include/ChangeLog:

        * elf/mips.h (SHT_GNU_XHASH): New define.
        (DT_GNU_XHASH): New define.

binutils/ChangeLog:

        * readelf.c (get_mips_dynamic_type): Return MIPS_XHASH dynamic type.
        (get_mips_section_type_name): Return MI{S_XHASH name string.
        (dynamic_section_mips_val): Initialize the .MIPS.xhash dynamic
        info.
        (process_symbol_table): Initialize the .MIPS.xhash section
        pointer. Adjust the readelf output to support the new section.
        (process_object): Set the .MIPS.xhash dynamic info to zero.
---
 bfd/elf-bfd.h                         |  7 ++++
 bfd/elflink.c                         | 46 ++++++++++++++++-----
 bfd/elfxx-mips.c                      | 78 +++++++++++++++++++++++++++++++++++
 bfd/elfxx-mips.h                      |  4 ++
 bfd/elfxx-target.h                    |  5 +++
 binutils/readelf.c                    | 52 +++++++++++++++++++++--
 include/elf/mips.h                    |  6 +++
 ld/emulparams/elf32bmip.sh            |  1 +
 ld/emulparams/elf32bmipn32-defs.sh    |  1 +
 ld/emulparams/elf64bmip-defs.sh       |  1 +
 ld/emultempl/mipself.em               | 16 -------
 ld/testsuite/ld-elf/hash.d            |  2 +-
 ld/testsuite/ld-mips-elf/hash1.d      | 11 +++++
 ld/testsuite/ld-mips-elf/hash1.s      |  8 +++-
 ld/testsuite/ld-mips-elf/hash1a.d     |  5 ---
 ld/testsuite/ld-mips-elf/hash1b.d     |  4 --
 ld/testsuite/ld-mips-elf/hash1c.d     |  4 --
 ld/testsuite/ld-mips-elf/hash2.d      | 17 ++++++++
 ld/testsuite/ld-mips-elf/mips-elf.exp |  5 +--
 ld/testsuite/ld-mips-elf/start.s      | 12 ++++++
 20 files changed, 237 insertions(+), 48 deletions(-)
 create mode 100644 ld/testsuite/ld-mips-elf/hash1.d
 delete mode 100644 ld/testsuite/ld-mips-elf/hash1a.d
 delete mode 100644 ld/testsuite/ld-mips-elf/hash1b.d
 delete mode 100644 ld/testsuite/ld-mips-elf/hash1c.d
 create mode 100644 ld/testsuite/ld-mips-elf/hash2.d
 create mode 100644 ld/testsuite/ld-mips-elf/start.s

diff --git a/bfd/elf-bfd.h b/bfd/elf-bfd.h
index 0d12f45..803df72 100644
--- a/bfd/elf-bfd.h
+++ b/bfd/elf-bfd.h
@@ -1393,6 +1393,13 @@ struct elf_backend_data
   /* Return TRUE if symbol should be hashed in the `.gnu.hash' section.  */
   bfd_boolean (*elf_hash_symbol) (struct elf_link_hash_entry *);
 
+  /* If non-NULL, called to register the location of XLAT_LOC within
+     .MIPS.xhash at which real final dynindx for H will be written.
+     If XLAT_LOC is zero, the symbol is not included in
+     .MIPS.xhash and no dynindx will be written.  */
+  void (*record_xhash_symbol)
+    (struct elf_link_hash_entry *h, bfd_vma xlat_loc);
+
   /* Return TRUE if type is a function symbol type.  */
   bfd_boolean (*is_function_type) (unsigned int type);
 
diff --git a/bfd/elflink.c b/bfd/elflink.c
index 02ea2dc..69b9088 100644
--- a/bfd/elflink.c
+++ b/bfd/elflink.c
@@ -339,7 +339,7 @@ _bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
       elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
     }
 
-  if (info->emit_gnu_hash)
+  if (info->emit_gnu_hash && bed->record_xhash_symbol == NULL)
     {
       s = bfd_make_section_anyway_with_flags (abfd, ".gnu.hash",
       flags | SEC_READONLY);
@@ -5845,6 +5845,7 @@ struct collect_gnu_hash_codes
   unsigned long int *counts;
   bfd_vma *bitmask;
   bfd_byte *contents;
+  bfd_size_type xlat;
   long int min_dynindx;
   unsigned long int bucketcount;
   unsigned long int symindx;
@@ -5909,10 +5910,12 @@ elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
 }
 
 /* This function will be called though elf_link_hash_traverse to do
-   final dynaminc symbol renumbering.  */
+   final dynamic symbol renumbering in case of .gnu.hash.
+   If using .MIPS.xhash, invoke record_xhash_symbol to add symbol index
+   to the translation table.  */
 
 static bfd_boolean
-elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
+elf_gnu_hash_process_symidx (struct elf_link_hash_entry *h, void *data)
 {
   struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
   unsigned long int bucket;
@@ -5926,7 +5929,15 @@ elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
   if (! (*s->bed->elf_hash_symbol) (h))
     {
       if (h->dynindx >= s->min_dynindx)
- h->dynindx = s->local_indx++;
+ {
+  if (s->bed->record_xhash_symbol != NULL)
+    {
+      (*s->bed->record_xhash_symbol) (h, 0);
+      s->local_indx++;
+    }
+  else
+    h->dynindx = s->local_indx++;
+ }
       return TRUE;
     }
 
@@ -5943,7 +5954,14 @@ elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
   bfd_put_32 (s->output_bfd, val,
       s->contents + (s->indx[bucket] - s->symindx) * 4);
   --s->counts[bucket];
-  h->dynindx = s->indx[bucket]++;
+  if (s->bed->record_xhash_symbol != NULL)
+    {
+      bfd_vma xlat_loc = s->xlat + (s->indx[bucket]++ - s->symindx) * 4;
+
+      (*s->bed->record_xhash_symbol) (h, xlat_loc);
+    }
+  else
+    h->dynindx = s->indx[bucket]++;
   return TRUE;
 }
 
@@ -6972,7 +6990,8 @@ bfd_elf_size_dynamic_sections (bfd *output_bfd,
   if ((info->emit_hash
        && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
       || (info->emit_gnu_hash
-  && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
+  && (bed->record_xhash_symbol == NULL
+      && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0)))
       || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
       || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
       || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
@@ -7093,6 +7112,9 @@ _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
       = elf_hash_table (info)->data_index_section;
 }
 
+#define GNU_HASH_SECTION_NAME(bed)    \
+  (bed)->record_xhash_symbol != NULL ? ".MIPS.xhash" : ".gnu.hash"
+
 bfd_boolean
 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
 {
@@ -7259,12 +7281,12 @@ bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
       return FALSE;
     }
 
-  s = bfd_get_linker_section (dynobj, ".gnu.hash");
+  s = bfd_get_linker_section (dynobj, GNU_HASH_SECTION_NAME (bed));
   BFD_ASSERT (s != NULL);
 
   if (cinfo.nsyms == 0)
     {
-      /* Empty .gnu.hash section is special.  */
+      /* Empty .gnu.hash or .MIPS.xhash section is special.  */
       BFD_ASSERT (cinfo.min_dynindx == -1);
       free (cinfo.hashcodes);
       s->size = 5 * 4 + bed->s->arch_size / 8;
@@ -7344,6 +7366,8 @@ bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
 
       s->size = (4 + bucketcount + cinfo.nsyms) * 4;
       s->size += cinfo.maskbits / 8;
+      if (bed->record_xhash_symbol != NULL)
+ s->size += cinfo.nsyms * 4;
       contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
       if (contents == NULL)
  {
@@ -7370,9 +7394,11 @@ bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
 
       cinfo.contents = contents;
 
-      /* Renumber dynamic symbols, populate .gnu.hash section.  */
+      cinfo.xlat = contents + cinfo.nsyms * 4 - s->contents;
+      /* Renumber dynamic symbols, if populating .gnu.hash section.
+ If using .MIPS.xhash, populate the translation table.  */
       elf_link_hash_traverse (elf_hash_table (info),
-      elf_renumber_gnu_hash_syms, &cinfo);
+      elf_gnu_hash_process_symidx, &cinfo);
 
       contents = s->contents + 16;
       for (i = 0; i < maskwords; ++i)
diff --git a/bfd/elfxx-mips.c b/bfd/elfxx-mips.c
index 55f891d..b91daae 100644
--- a/bfd/elfxx-mips.c
+++ b/bfd/elfxx-mips.c
@@ -322,6 +322,11 @@ struct mips_elf_hash_sort_data
   /* The greatest dynamic symbol table index corresponding to an external
      symbol without a GOT entry.  */
   bfd_size_type max_non_got_dynindx;
+  /* If non-NULL, output BFD for .MIPS.xhash finalization.  */
+  bfd *output_bfd;
+  /* If non-NULL, pointer to contents of .MIPS.xhash for filling in
+     real final dynindx.  */
+  bfd_byte *mipsxhash;
 };
 
 /* We make up to two PLT entries if needed, one for standard MIPS code
@@ -379,6 +384,9 @@ struct mips_elf_link_hash_entry
      being called returns a floating point value.  */
   asection *call_fp_stub;
 
+  /* If non-zero, location in .MIPS.xhash to write real final dynindx.  */
+  bfd_vma mipsxhash_loc;
+
   /* The highest GGA_* value that satisfies all references to this symbol.  */
   unsigned int global_got_area : 2;
 
@@ -1335,6 +1343,7 @@ mips_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
       ret->fn_stub = NULL;
       ret->call_stub = NULL;
       ret->call_fp_stub = NULL;
+      ret->mipsxhash_loc = 0;
       ret->global_got_area = GGA_NONE;
       ret->got_only_for_calls = TRUE;
       ret->readonly_reloc = FALSE;
@@ -3907,6 +3916,18 @@ mips_elf_sort_hash_table (bfd *abfd, struct bfd_link_info *info)
      at the head of the table; see `_bfd_elf_link_renumber_dynsyms'.  */
   hsd.max_local_dynindx = count_section_dynsyms (abfd, info) + 1;
   hsd.max_non_got_dynindx = htab->root.local_dynsymcount + 1;
+  hsd.output_bfd = abfd;
+  if (htab->root.dynobj != NULL
+      && htab->root.dynamic_sections_created
+      && info->emit_gnu_hash)
+    {
+      asection *s = bfd_get_linker_section (htab->root.dynobj, ".MIPS.xhash");
+      BFD_ASSERT (s != NULL);
+      hsd.mipsxhash = s->contents;
+      BFD_ASSERT (hsd.mipsxhash != NULL);
+    }
+  else
+    hsd.mipsxhash = NULL;
   mips_elf_link_hash_traverse (htab, mips_elf_sort_hash_table_f, &hsd);
 
   /* There should have been enough room in the symbol table to
@@ -3958,6 +3979,12 @@ mips_elf_sort_hash_table_f (struct mips_elf_link_hash_entry *h, void *data)
       break;
     }
 
+  /* Populate the .MIPS.xhash translation table entry with
+     the symbol dynindx.  */
+  if (h->mipsxhash_loc != 0 && hsd->mipsxhash != NULL)
+    bfd_put_32 (hsd->output_bfd, h->root.dynindx,
+ hsd->mipsxhash + h->mipsxhash_loc);
+
   return TRUE;
 }
 
@@ -7475,6 +7502,9 @@ _bfd_mips_elf_section_from_shdr (bfd *abfd,
   && ! CONST_STRNEQ (name, ".MIPS.post_rel"))
  return FALSE;
       break;
+    case SHT_MIPS_XHASH:
+      if (strcmp (name, ".MIPS.xhash") != 0)
+ return FALSE;
     default:
       break;
     }
@@ -7708,6 +7738,12 @@ _bfd_mips_elf_fake_sections (bfd *abfd, Elf_Internal_Shdr *hdr, asection *sec)
       hdr->sh_flags |= SHF_ALLOC;
       hdr->sh_entsize = 8;
     }
+  else if (strcmp (name, ".MIPS.xhash") == 0)
+    {
+      hdr->sh_type = SHT_MIPS_XHASH;
+      hdr->sh_flags |= SHF_ALLOC;
+      hdr->sh_entsize = get_elf_backend_data(abfd)->s->arch_size == 64 ? 0 : 4;
+    }
 
   /* The generic elf_fake_sections will set up REL_HDR using the default
    kind of relocations.  We used to set up a second header for the
@@ -7994,6 +8030,11 @@ _bfd_mips_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
  return FALSE;
     }
 
+  /* Create .MIPS.xhash section.  */
+  if (info->emit_gnu_hash)
+    s = bfd_make_section_anyway_with_flags (abfd, ".MIPS.xhash",
+    flags | SEC_READONLY);
+
   /* On IRIX5, we adjust add some additional symbols and change the
      alignments of several sections.  There is no ABI documentation
      indicating that this is necessary on IRIX6, nor any evidence that
@@ -10176,6 +10217,10 @@ _bfd_mips_elf_size_dynamic_sections (bfd *output_bfd,
   if (! MIPS_ELF_ADD_DYNAMIC_ENTRY (info, DT_MIPS_GOTSYM, 0))
     return FALSE;
 
+  if (info->emit_gnu_hash
+      && ! MIPS_ELF_ADD_DYNAMIC_ENTRY (info, DT_MIPS_XHASH, 0))
+    return FALSE;
+
   if (IRIX_COMPAT (dynobj) == ict_irix5
       && ! MIPS_ELF_ADD_DYNAMIC_ENTRY (info, DT_MIPS_HIPAGENO, 0))
     return FALSE;
@@ -11953,6 +11998,12 @@ _bfd_mips_elf_finish_dynamic_sections (bfd *output_bfd,
  swap_out_p = FALSE;
       break;
 
+    case DT_MIPS_XHASH:
+      name = ".MIPS.xhash";
+      s = bfd_get_linker_section (dynobj, name);
+      dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
+      break;
+
     default:
       swap_out_p = FALSE;
       if (htab->is_vxworks
@@ -12435,6 +12486,10 @@ _bfd_mips_elf_final_write_processing (bfd *abfd,
   (*hdrpp)->sh_link = elf_section_data (sec)->this_idx;
   break;
 
+ case SHT_MIPS_XHASH:
+  sec = bfd_get_section_by_name (abfd, ".dynsym");
+  if (sec != NULL)
+    (*hdrpp)->sh_link = elf_section_data (sec)->this_idx;
  }
     }
 }
@@ -15931,6 +15986,8 @@ _bfd_mips_elf_get_target_dtag (bfd_vma dtag)
       return "DT_MIPS_PLTGOT";
     case DT_MIPS_RWPLT:
       return "DT_MIPS_RWPLT";
+    case DT_MIPS_XHASH:
+      return "DT_MIPS_XHASH";
     }
 }
 
@@ -16264,6 +16321,7 @@ const struct bfd_elf_special_section _bfd_mips_elf_special_sections[] =
   { STRING_COMMA_LEN (".sbss"), -2, SHT_NOBITS,     SHF_ALLOC + SHF_WRITE + SHF_MIPS_GPREL },
   { STRING_COMMA_LEN (".sdata"), -2, SHT_PROGBITS,   SHF_ALLOC + SHF_WRITE + SHF_MIPS_GPREL },
   { STRING_COMMA_LEN (".ucode"),  0, SHT_MIPS_UCODE, 0 },
+  { STRING_COMMA_LEN (".MIPS.xhash"),  0, SHT_MIPS_XHASH,   SHF_ALLOC },
   { NULL,      0,  0, 0,     0 }
 };
 
@@ -16578,6 +16636,7 @@ enum
   MIPS_LIBC_ABI_UNIQUE,
   MIPS_LIBC_ABI_MIPS_O32_FP64,
   MIPS_LIBC_ABI_ABSOLUTE,
+  MIPS_LIBC_ABI_XHASH,
   MIPS_LIBC_ABI_MAX
 };
 
@@ -16605,6 +16664,11 @@ _bfd_mips_post_process_headers (bfd *abfd, struct bfd_link_info *link_info)
   if (htab != NULL && htab->use_absolute_zero && htab->gnu_target)
     i_ehdrp->e_ident[EI_ABIVERSION] = MIPS_LIBC_ABI_ABSOLUTE;
 
+  /* Mark that we need support for .MIPS.xhash in the dynamic linker,
+     if it is the only hash section that will be created.  */
+  if (link_info && link_info->emit_gnu_hash && !link_info->emit_hash)
+    i_ehdrp->e_ident[EI_ABIVERSION] = MIPS_LIBC_ABI_XHASH;
+
   _bfd_elf_post_process_headers (abfd, link_info);
 }
 
@@ -16623,3 +16687,17 @@ _bfd_mips_elf_cant_unwind_opcode
 {
   return COMPACT_EH_CANT_UNWIND_OPCODE;
 }
+
+/* Record a position XLAT_LOC in the xlat translation table, associated with
+   the hash entry H.  The entry in the translation table will later be
+   populated with the real symbol dynindx.  */
+
+void
+_bfd_mips_elf_record_xhash_symbol (struct elf_link_hash_entry *h,
+   bfd_vma xlat_loc)
+{
+  struct mips_elf_link_hash_entry *hmips;
+
+  hmips = (struct mips_elf_link_hash_entry *) h;
+  hmips->mipsxhash_loc = xlat_loc;
+}
diff --git a/bfd/elfxx-mips.h b/bfd/elfxx-mips.h
index acd9d79..bbbd672 100644
--- a/bfd/elfxx-mips.h
+++ b/bfd/elfxx-mips.h
@@ -171,6 +171,9 @@ extern bfd_boolean _bfd_mips_elf_common_definition (Elf_Internal_Sym *);
 extern int _bfd_mips_elf_compact_eh_encoding (struct bfd_link_info *);
 extern int _bfd_mips_elf_cant_unwind_opcode (struct bfd_link_info *);
 
+extern void _bfd_mips_elf_record_xhash_symbol
+  (struct elf_link_hash_entry *h, bfd_vma xlat_loc);
+
 static inline bfd_boolean
 gprel16_reloc_p (unsigned int r_type)
 {
@@ -196,4 +199,5 @@ literal_reloc_p (int r_type)
 #define elf_backend_post_process_headers _bfd_mips_post_process_headers
 #define elf_backend_compact_eh_encoding _bfd_mips_elf_compact_eh_encoding
 #define elf_backend_cant_unwind_opcode _bfd_mips_elf_cant_unwind_opcode
+#define elf_backend_record_xhash_symbol _bfd_mips_elf_record_xhash_symbol
 #define elf_backend_always_renumber_dynsyms TRUE
diff --git a/bfd/elfxx-target.h b/bfd/elfxx-target.h
index e4e7546..e5f8ea2 100644
--- a/bfd/elfxx-target.h
+++ b/bfd/elfxx-target.h
@@ -734,6 +734,10 @@
 #define elf_backend_hash_symbol _bfd_elf_hash_symbol
 #endif
 
+#ifndef elf_backend_record_xhash_symbol
+#define elf_backend_record_xhash_symbol NULL
+#endif
+
 #ifndef elf_backend_is_function_type
 #define elf_backend_is_function_type _bfd_elf_is_function_type
 #endif
@@ -858,6 +862,7 @@ static struct elf_backend_data elfNN_bed =
   elf_backend_common_section,
   elf_backend_merge_symbol,
   elf_backend_hash_symbol,
+  elf_backend_record_xhash_symbol,
   elf_backend_is_function_type,
   elf_backend_maybe_function_sym,
   elf_backend_get_reloc_section,
diff --git a/binutils/readelf.c b/binutils/readelf.c
index febfd1a..2e8ea53 100644
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -232,6 +232,7 @@ static unsigned int dynamic_syminfo_nent;
 static char program_interpreter[PATH_MAX];
 static bfd_vma dynamic_info[DT_ENCODING];
 static bfd_vma dynamic_info_DT_GNU_HASH;
+static bfd_vma dynamic_info_DT_MIPS_XHASH;
 static bfd_vma version_info[16];
 static Elf_Internal_Dyn *  dynamic_section;
 static elf_section_list * symtab_shndx_list;
@@ -335,6 +336,10 @@ static const char * get_symbol_version_string
  (ADDR) &= ~1; \
     } \
   while (0)
+
+/* Get the correct GNU hash section name.  */
+#define GNU_HASH_SECTION_NAME \
+  dynamic_info_DT_MIPS_XHASH ? ".MIPS.xhash" : ".gnu.hash"
 
 /* Print a BFD_VMA to an internal buffer, for use in error messages.
    BFD_FMA_FMT can't be used in translated strings.  */
@@ -1874,6 +1879,7 @@ get_mips_dynamic_type (unsigned long type)
     case DT_MIPS_AUX_DYNAMIC: return "MIPS_AUX_DYNAMIC";
     case DT_MIPS_PLTGOT: return "MIPS_PLTGOT";
     case DT_MIPS_RWPLT: return "MIPS_RWPLT";
+    case DT_MIPS_XHASH: return "MIPS_XHASH";
     default:
       return NULL;
     }
@@ -4098,6 +4104,7 @@ get_mips_section_type_name (unsigned int sh_type)
     case SHT_MIPS_XLATE_OLD: return "MIPS_XLATE_OLD";
     case SHT_MIPS_PDR_EXCEPTION: return "MIPS_PDR_EXCEPTION";
     case SHT_MIPS_ABIFLAGS: return "MIPS_ABIFLAGS";
+    case SHT_MIPS_XHASH: return "MIPS_XHASH";
     default:
       break;
     }
@@ -9496,6 +9503,11 @@ dynamic_section_mips_val (Elf_Internal_Dyn * entry)
       print_vma (entry->d_un.d_val, DEC);
       break;
 
+    case DT_MIPS_XHASH:
+      dynamic_info_DT_MIPS_XHASH = entry->d_un.d_val;
+      dynamic_info_DT_GNU_HASH = entry->d_un.d_val;
+      /* Falls through.  */
+
     default:
       print_vma (entry->d_un.d_ptr, PREFIX_HEX);
     }
@@ -11632,6 +11644,7 @@ process_symbol_table (Filedata * filedata)
   bfd_vma ngnubuckets = 0;
   bfd_vma * gnubuckets = NULL;
   bfd_vma * gnuchains = NULL;
+  bfd_vma * mipsxlat = NULL;
   bfd_vma gnusymidx = 0;
   bfd_size_type ngnuchains = 0;
 
@@ -11797,7 +11810,31 @@ process_symbol_table (Filedata * filedata)
       gnuchains = get_dynamic_data (filedata, maxchain, 4);
       ngnuchains = maxchain;
 
+      if (gnuchains == NULL)
+ goto no_gnu_hash;
+
+      if (dynamic_info_DT_MIPS_XHASH)
+ {
+  if (fseek (filedata->handle,
+     (archive_file_offset
+      + offset_from_vma (filedata, (buckets_vma
+    + 4 * (ngnubuckets
+   + maxchain)), 4)),
+     SEEK_SET))
+    {
+      error (_("Unable to seek to start of dynamic information\n"));
+      goto no_gnu_hash;
+    }
+
+  mipsxlat = get_dynamic_data (filedata, maxchain, 4);
+ }
+
     no_gnu_hash:
+      if (dynamic_info_DT_MIPS_XHASH && mipsxlat == NULL)
+ {
+  free (gnuchains);
+  gnuchains = NULL;
+ }
       if (gnuchains == NULL)
  {
   free (gnubuckets);
@@ -11847,7 +11884,8 @@ process_symbol_table (Filedata * filedata)
 
       if (dynamic_info_DT_GNU_HASH)
  {
-  printf (_("\nSymbol table of `.gnu.hash' for image:\n"));
+  printf (_("\nSymbol table of `%s' for image:\n"),
+  GNU_HASH_SECTION_NAME);
   if (is_32bit_elf)
     printf (_("  Num Buc:    Value  Size   Type   Bind Vis      Ndx Name\n"));
   else
@@ -11861,7 +11899,10 @@ process_symbol_table (Filedata * filedata)
 
  do
   {
-    print_dynamic_symbol (filedata, si, hn);
+    if (dynamic_info_DT_MIPS_XHASH)
+      print_dynamic_symbol (filedata, mipsxlat[off], hn);
+    else
+      print_dynamic_symbol (filedata, si, hn);
     si++;
   }
  while (off < ngnuchains && (gnuchains[off++] & 1) == 0);
@@ -12084,11 +12125,12 @@ process_symbol_table (Filedata * filedata)
       unsigned long nzero_counts = 0;
       unsigned long nsyms = 0;
 
-      printf (ngettext ("\nHistogram for `.gnu.hash' bucket list length "
+      printf (ngettext ("\nHistogram for `%s' bucket list length "
  "(total of %lu bucket):\n",
- "\nHistogram for `.gnu.hash' bucket list length "
+ "\nHistogram for `%s' bucket list length "
  "(total of %lu buckets):\n",
  (unsigned long) ngnubuckets),
+      GNU_HASH_SECTION_NAME,
       (unsigned long) ngnubuckets);
 
       lengths = (unsigned long *) calloc (ngnubuckets, sizeof (*lengths));
@@ -12145,6 +12187,7 @@ process_symbol_table (Filedata * filedata)
       free (lengths);
       free (gnubuckets);
       free (gnuchains);
+      free (mipsxlat);
     }
 
   return TRUE;
@@ -19625,6 +19668,7 @@ process_object (Filedata * filedata)
   for (i = ARRAY_SIZE (dynamic_info); i--;)
     dynamic_info[i] = 0;
   dynamic_info_DT_GNU_HASH = 0;
+  dynamic_info_DT_MIPS_XHASH = 0;
 
   /* Process the file.  */
   if (show_name)
diff --git a/include/elf/mips.h b/include/elf/mips.h
index b76d450..cd6779f 100644
--- a/include/elf/mips.h
+++ b/include/elf/mips.h
@@ -452,6 +452,9 @@ END_RELOC_NUMBERS (R_MIPS_maxext)
 /* ABI related flags section.  */
 #define SHT_MIPS_ABIFLAGS 0x7000002a
 
+/* GNU style symbol hash table with xlat.  */
+#define SHT_MIPS_XHASH 0x7000002b
+
 /* A section of type SHT_MIPS_LIBLIST contains an array of the
    following structure.  The sh_link field is the section index of the
    string table.  The sh_info field is the number of entries in the
@@ -759,6 +762,9 @@ extern void bfd_mips_elf32_swap_reginfo_out
 
 /* Relative offset of run time loader map, used for debugging.  */
 #define DT_MIPS_RLD_MAP_REL    0x70000035
+
+/* Address of .MIPS.xhash section.  */
+#define DT_MIPS_XHASH       0x70000036
 
 /* Flags which may appear in a DT_MIPS_FLAGS entry.  */
 
diff --git a/ld/emulparams/elf32bmip.sh b/ld/emulparams/elf32bmip.sh
index abbcb5b..1e0200a 100644
--- a/ld/emulparams/elf32bmip.sh
+++ b/ld/emulparams/elf32bmip.sh
@@ -19,6 +19,7 @@ fi
 INITIAL_READONLY_SECTIONS="${INITIAL_READONLY_SECTIONS}
   .MIPS.abiflags ${RELOCATING-0} : { *(.MIPS.abiflags) }
   .reginfo       ${RELOCATING-0} : { *(.reginfo) }
+  .MIPS.xhash    ${RELOCATING-0} : { *(.MIPS.xhash) }
 "
 OTHER_TEXT_SECTIONS='*(.mips16.fn.*) *(.mips16.call.*)'
 # Unlike most targets, the MIPS backend puts all dynamic relocations
diff --git a/ld/emulparams/elf32bmipn32-defs.sh b/ld/emulparams/elf32bmipn32-defs.sh
index bd01790..80dce8f 100644
--- a/ld/emulparams/elf32bmipn32-defs.sh
+++ b/ld/emulparams/elf32bmipn32-defs.sh
@@ -87,6 +87,7 @@ if test -z "${CREATE_SHLIB}"; then
 fi
 INITIAL_READONLY_SECTIONS="${INITIAL_READONLY_SECTIONS}
   .MIPS.abiflags      ${RELOCATING-0} : { *(.MIPS.abiflags) }
+  .MIPS.xhash      ${RELOCATING-0} : { *(.MIPS.xhash) }
   .reginfo      ${RELOCATING-0} : { *(.reginfo) }"
 # Discard any .MIPS.content* or .MIPS.events* sections.  The linker
 # doesn't know how to adjust them.
diff --git a/ld/emulparams/elf64bmip-defs.sh b/ld/emulparams/elf64bmip-defs.sh
index 61d6c00..4165f51 100644
--- a/ld/emulparams/elf64bmip-defs.sh
+++ b/ld/emulparams/elf64bmip-defs.sh
@@ -2,5 +2,6 @@ source_sh ${srcdir}/emulparams/elf32bmipn32-defs.sh
 COMMONPAGESIZE="CONSTANT (COMMONPAGESIZE)"
 INITIAL_READONLY_SECTIONS="
   .MIPS.abiflags      ${RELOCATING-0} : { *(.MIPS.abiflags) }
+  .MIPS.xhash      ${RELOCATING-0} : { *(.MIPS.xhash) }
   .MIPS.options : { *(.MIPS.options) }
 "
diff --git a/ld/emultempl/mipself.em b/ld/emultempl/mipself.em
index ec908d7..fe46e0d 100644
--- a/ld/emultempl/mipself.em
+++ b/ld/emultempl/mipself.em
@@ -46,21 +46,6 @@ static bfd_boolean insn32;
 static bfd_boolean ignore_branch_isa;
 static bfd_boolean compact_branches;
 
-static void
-mips_after_parse (void)
-{
-  /* .gnu.hash and the MIPS ABI require .dynsym to be sorted in different
-     ways.  .gnu.hash needs symbols to be grouped by hash code whereas the
-     MIPS ABI requires a mapping between the GOT and the symbol table.  */
-  if (link_info.emit_gnu_hash)
-    {
-      einfo (_("%X%P: .gnu.hash is incompatible with the MIPS ABI\n"));
-      link_info.emit_hash = TRUE;
-      link_info.emit_gnu_hash = FALSE;
-    }
-  gld${EMULATION_NAME}_after_parse ();
-}
-
 struct hook_stub_info
 {
   lang_statement_list_type add;
@@ -337,6 +322,5 @@ PARSE_AND_LIST_ARGS_CASES='
       break;
 '
 
-LDEMUL_AFTER_PARSE=mips_after_parse
 LDEMUL_BEFORE_ALLOCATION=mips_before_allocation
 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=mips_create_output_section_statements
diff --git a/ld/testsuite/ld-elf/hash.d b/ld/testsuite/ld-elf/hash.d
index fb07912..efe675e 100644
--- a/ld/testsuite/ld-elf/hash.d
+++ b/ld/testsuite/ld-elf/hash.d
@@ -3,7 +3,7 @@
 #ld: -shared --hash-style=gnu
 #target: *-*-linux* *-*-gnu* arm*-*-uclinuxfdpiceabi
 #xfail: mips*-*-*
-# GNU hash is not supported for MIPS targets due to psABI restrictions
+# MIPS uses a different style of GNU hash due to psABI restrictions
 # on dynsym table ordering.
 
 #...
diff --git a/ld/testsuite/ld-mips-elf/hash1.d b/ld/testsuite/ld-mips-elf/hash1.d
new file mode 100644
index 0000000..3b9725d
--- /dev/null
+++ b/ld/testsuite/ld-mips-elf/hash1.d
@@ -0,0 +1,11 @@
+#source: hash1.s
+#readelf: -d -I
+#ld: -nostdlib -shared --hash-style=gnu
+#target: [check_shared_lib_support]
+#xfail: mips*-*-irix*
+
+#...
+ +0x[0-9a-z]+ +\(MIPS_XHASH\) +0x[0-9a-z]+
+#...
+ +1 +1 +\( 50.0%\) +100.0%
+#...
diff --git a/ld/testsuite/ld-mips-elf/hash1.s b/ld/testsuite/ld-mips-elf/hash1.s
index 4e7fe2f..587cef1 100644
--- a/ld/testsuite/ld-mips-elf/hash1.s
+++ b/ld/testsuite/ld-mips-elf/hash1.s
@@ -1 +1,7 @@
- nop
+.globl foo
+
+.text
+
+foo:
+    jr $ra
+    nop
diff --git a/ld/testsuite/ld-mips-elf/hash1a.d b/ld/testsuite/ld-mips-elf/hash1a.d
deleted file mode 100644
index c189c93..0000000
--- a/ld/testsuite/ld-mips-elf/hash1a.d
+++ /dev/null
@@ -1,5 +0,0 @@
-#source: hash1.s
-#ld: -shared --hash-style=sysv
-#objdump: -dr
-#target: [check_shared_lib_support]
-#pass
diff --git a/ld/testsuite/ld-mips-elf/hash1b.d b/ld/testsuite/ld-mips-elf/hash1b.d
deleted file mode 100644
index 5cafede..0000000
--- a/ld/testsuite/ld-mips-elf/hash1b.d
+++ /dev/null
@@ -1,4 +0,0 @@
-#source: hash1.s
-#ld: -shared --hash-style=both
-#target: [check_shared_lib_support]
-#error: .gnu.hash is incompatible with the MIPS ABI
diff --git a/ld/testsuite/ld-mips-elf/hash1c.d b/ld/testsuite/ld-mips-elf/hash1c.d
deleted file mode 100644
index 379620a..0000000
--- a/ld/testsuite/ld-mips-elf/hash1c.d
+++ /dev/null
@@ -1,4 +0,0 @@
-#source: hash1.s
-#ld: -shared --hash-style=gnu
-#target: [check_shared_lib_support]
-#error: .gnu.hash is incompatible with the MIPS ABI
diff --git a/ld/testsuite/ld-mips-elf/hash2.d b/ld/testsuite/ld-mips-elf/hash2.d
new file mode 100644
index 0000000..79fda3c
--- /dev/null
+++ b/ld/testsuite/ld-mips-elf/hash2.d
@@ -0,0 +1,17 @@
+#source: start.s
+#readelf: -d -s -D
+#ld: -shared --hash-style=gnu
+#target: [check_shared_lib_support]
+#xfail: mips*-*-irix*
+
+#...
+ +0x[0-9a-z]+ +\(MIPS_XHASH\) +0x[0-9a-z]+
+#...
+ +[0-9]+ +[0-9]+: +[0-9a-f]+ +[0-9]+ +NOTYPE +GLOBAL +DEFAULT +[1-9] _start
+#...
+ +[0-9]+ +[0-9]+: +[0-9a-f]+ +[0-9]+ +NOTYPE +GLOBAL +DEFAULT +[1-9] main
+#...
+ +[0-9]+ +[0-9]+: +[0-9a-f]+ +[0-9]+ +NOTYPE +GLOBAL +DEFAULT +[1-9] start
+#...
+ +[0-9]+ +[0-9]+: +[0-9a-f]+ +[0-9]+ +NOTYPE +GLOBAL +DEFAULT +[1-9] __start
+#...
diff --git a/ld/testsuite/ld-mips-elf/mips-elf.exp b/ld/testsuite/ld-mips-elf/mips-elf.exp
index 1fee8ef..3c7ce6a 100644
--- a/ld/testsuite/ld-mips-elf/mips-elf.exp
+++ b/ld/testsuite/ld-mips-elf/mips-elf.exp
@@ -854,9 +854,8 @@ if { $linux_gnu } {
 
 run_dump_test_n32 "emit-relocs-1" {{as -EB} {ld -EB}}
 
-run_dump_test "hash1a"
-run_dump_test "hash1b"
-run_dump_test "hash1c"
+run_dump_test "hash1"
+run_dump_test "hash2"
 
 if { $linux_gnu && $has_abi(o32) } {
     # The number of symbols that are always included in the symbol table
diff --git a/ld/testsuite/ld-mips-elf/start.s b/ld/testsuite/ld-mips-elf/start.s
new file mode 100644
index 0000000..ee26ab3
--- /dev/null
+++ b/ld/testsuite/ld-mips-elf/start.s
@@ -0,0 +1,12 @@
+ .text
+ .globl start
+start:
+ .globl _start
+_start:
+ .globl __start
+__start:
+ .globl main
+main:
+ .globl _main
+_main:
+ .dc.a 0
--
2.7.4

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Re: [PATCH v4] MIPS support for GNU hash

Mihailo Stojanovic
Hello again,

I would like to inquire about the state of the RT-RK copyright
assignment for binutils, which is what is currently blocking
this patch. Is there anything else to be done on our side?

Regards,
Mihailo

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Re: [PATCH v4] MIPS support for GNU hash

Nick Clifton
Hi Mihailo,

> I would like to inquire about the state of the RT-RK copyright
> assignment for binutils, which is what is currently blocking
> this patch. Is there anything else to be done on our side?

Sorry, but at this point all you can is wait.  The FSF will process
the assignment, but sometimes it does take a little while.

Cheers
  Nick


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Re: [PATCH v4] MIPS support for GNU hash

Carlos O'Donell-6
On 7/22/19 10:11 AM, Nick Clifton wrote:
> Hi Mihailo,
>
>> I would like to inquire about the state of the RT-RK copyright
>> assignment for binutils, which is what is currently blocking
>> this patch. Is there anything else to be done on our side?
>
> Sorry, but at this point all you can is wait.  The FSF will process
> the assignment, but sometimes it does take a little while.

If we're blocked on the binutils pieces is there any benefit in getting
the glibc pieces in place for 2.30 (August 1st release)?

Would it allow glibc to be able to immediately consume the new GNU hash
support?

Are these patches at the point (version 4) where we think they are pretty
much done and acceptable. I'd hate to commit something to 2.30 that is
then broken with whatever final form is committed to binutils.

--
Cheers,
Carlos.
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Re: [PATCH v4] MIPS support for GNU hash

Carlos O'Donell-6
In reply to this post by Mihailo Stojanovic
On 7/15/19 9:08 AM, Mihailo Stojanović wrote:
> Hello again,
>
> I would like to inquire about the state of the RT-RK copyright
> assignment for binutils, which is what is currently blocking
> this patch. Is there anything else to be done on our side?

I'm surprised it's taking this long.

You already have copyright for gcc, gdb, and glibc.

It's only binutils that is being added.

I would follow up with the FSF again and ask for status.

--
Cheers,
Carlos.
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Re: [PATCH v4] MIPS support for GNU hash

Petar Jovanovic-3


-------- Original Message --------
Subject: Re: [PATCH v4] MIPS support for GNU hash
Date: Tuesday, July 23, 2019 11:35 PM CEST
From: Carlos O'Donell <[hidden email]>
Organization: Red Hat
To: Mihailo Stojanović <[hidden email]>, [hidden email]
CC: Nick Clifton <[hidden email]>, Chenghua Xu <[hidden email]>, Joseph Myers <[hidden email]>, "Maciej W . Rozycki" <[hidden email]>, Petar Jovanovic <[hidden email]>, Dragan Mladjenovic <[hidden email]>
References: <[hidden email]> <[hidden email]>

> I'm surprised it's taking this long.
>
> You already have copyright for gcc, gdb, and glibc.
>
> It's only binutils that is being added.
>
> I would follow up with the FSF again and ask for status.
>

We did. No response from the FSF. I assume it has been sorted out there, can somebody check?

Regards,
Petar

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Re: [PATCH v4] MIPS support for GNU hash

Nick Clifton
Hi Guys,

On 23/07/2019 23:10, Petar Jovanovic wrote:
> We did. No response from the FSF. I assume it has been sorted out there, can somebody check?

Sorry, but according to the latest version of the copyright
list fetched from fencepost, the assignments are:

  GCC GDB GLIBC RT-RK Computer Based Systems LLC 2017-09-05
  Assigns past and future changes.
  Milenko Beric (CFO)

So there has been no update.  I will however ping the FSF and see
if I can get a response myself.

Cheers
  Nick
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Re: [PATCH v4] MIPS support for GNU hash

Dragan Mladjenovic-2
In reply to this post by Carlos O'Donell-6
On 23.07.2019. 23:34, Carlos O'Donell wrote:

> On 7/22/19 10:11 AM, Nick Clifton wrote:
>> Hi Mihailo,
>>
>>> I would like to inquire about the state of the RT-RK copyright
>>> assignment for binutils, which is what is currently blocking
>>> this patch. Is there anything else to be done on our side?
>>
>> Sorry, but at this point all you can is wait.  The FSF will process
>> the assignment, but sometimes it does take a little while.
>
> If we're blocked on the binutils pieces is there any benefit in getting
> the glibc pieces in place for 2.30 (August 1st release)?
>
> Would it allow glibc to be able to immediately consume the new GNU hash
> support?
   Yes, It would be beneficial to have glibc support ready before next
binutils release.
   At least for us, it will allow for shipping of this feature in the
next release of vendor tool-chain.
>
>
> Are these patches at the point (version 4) where we think they are pretty
> much done and acceptable. I'd hate to commit something to 2.30 that is
> then broken with whatever final form is committed to binutils.
>
  I believe so, but it is for Nick Clifton to confirm that.
  Actual ABI hasn't changed since v2 and both submissions are kept in sync.

Best regards,

Dragan
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Re: [PATCH v4] MIPS support for GNU hash

Nick Clifton
Hi Guys,

>> Are these patches at the point (version 4) where we think they are pretty
>> much done and acceptable. I'd hate to commit something to 2.30 that is
>> then broken with whatever final form is committed to binutils.
>>
>  I believe so, but it is for Nick Clifton to confirm that.

Yes - the v4 patch is commit ready as far as I am concerned.

Cheers
  Nick


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Re: [PATCH v4] MIPS support for GNU hash

Mihailo Stojanovic
In reply to this post by Mihailo Stojanovic
Hi,

According to the latest information I have, the copyright assignment
has been processed by the FSF. Could somebody check?

Thanks,
Mihailo

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Re: [PATCH v4] MIPS support for GNU hash

Nick Clifton
Hi Mihailo,

> According to the latest information I have, the copyright assignment
> has been processed by the FSF. Could somebody check?

I received the notification as well.  Give me a moment to find the v4
patch in my logs and I will check it in...

Cheers
  Nick


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Re: [PATCH v4] MIPS support for GNU hash

Nick Clifton
In reply to this post by Mihailo Stojanovic
Hi Mihailo,

  ... and the patch is in!

  Thanks very much for persisting with this submission.

Cheers
  Nick