toolchain/binutils/patches/2.20.1/200-mips_non_pic.patch

   1 --- a/bfd/elf32-mips.c
   2 +++ b/bfd/elf32-mips.c
   3 @@ -1663,6 +1663,15 @@ static const struct ecoff_debug_swap mip
   4  #define elf_backend_plt_readonly       1
   5  #define elf_backend_plt_sym_val                _bfd_mips_elf_plt_sym_val
   6
   7 +/* Most MIPS ELF files do not contain a traditional PLT; only VxWorks
   8 +   and non-PIC dynamic executables do.  These settings only affect
   9 +   _bfd_elf_create_dynamic_sections, which is only called when we
  10 +   do want a traditional PLT.  */
  11 +#undef elf_backend_want_plt_sym
  12 +#define elf_backend_want_plt_sym               1
  13 +#undef elf_backend_plt_readonly
  14 +#define elf_backend_plt_readonly               1
  15 +
  16  #define elf_backend_discard_info       _bfd_mips_elf_discard_info
  17  #define elf_backend_ignore_discarded_relocs \
  18                                         _bfd_mips_elf_ignore_discarded_relocs
  19 @@ -1687,6 +1696,8 @@ static const struct ecoff_debug_swap mip
  20  #define bfd_elf32_bfd_print_private_bfd_data \
  21                                         _bfd_mips_elf_print_private_bfd_data
  22
  23 +#define elf_backend_plt_sym_val                _bfd_mips_elf_plt_sym_val
  24 +
  25  /* Support for SGI-ish mips targets.  */
  26  #define TARGET_LITTLE_SYM              bfd_elf32_littlemips_vec
  27  #define TARGET_LITTLE_NAME             "elf32-littlemips"
  28 @@ -1790,6 +1801,7 @@ mips_vxworks_final_write_processing (bfd
  29  #undef elf_backend_additional_program_headers
  30  #undef elf_backend_modify_segment_map
  31  #undef elf_backend_symbol_processing
  32 +#undef elf_backend_plt_sym_val
  33  /* NOTE: elf_backend_rela_normal is not defined for MIPS.  */
  34
  35  #include "elf32-target.h"
  36 --- a/bfd/elfxx-mips.c
  37 +++ b/bfd/elfxx-mips.c
  38 @@ -694,6 +694,11 @@ static bfd *reldyn_sorting_bfd;
  39  /* Nonzero if ABFD is using NewABI conventions.  */
  40  #define NEWABI_P(abfd) (ABI_N32_P (abfd) || ABI_64_P (abfd))
  41
  42 +/* Nonzero if ABFD is a non-PIC object.  */
  43 +#define NON_PIC_P(abfd) \
  44 +  (((elf_elfheader (abfd)->e_flags & EF_MIPS_PIC) == 0) \
  45 +   && ((elf_elfheader (abfd)->e_flags & EF_MIPS_CPIC) == EF_MIPS_CPIC))
  46 +
  47  /* The IRIX compatibility level we are striving for.  */
  48  #define IRIX_COMPAT(abfd) \
  49    (get_elf_backend_data (abfd)->elf_backend_mips_irix_compat (abfd))
  50 @@ -706,6 +711,9 @@ static bfd *reldyn_sorting_bfd;
  51  #define MIPS_ELF_OPTIONS_SECTION_NAME(abfd) \
  52    (NEWABI_P (abfd) ? ".MIPS.options" : ".options")
  53
  54 +/* The name of the section holding non-PIC to PIC call stubs.  */
  55 +#define NON_PIC_TO_PIC_STUB_SECTION_NAME ".MIPS.pic_stubs"
  56 +
  57  /* True if NAME is the recognized name of any SHT_MIPS_OPTIONS section.
  58     Some IRIX system files do not use MIPS_ELF_OPTIONS_SECTION_NAME.  */
  59  #define MIPS_ELF_OPTIONS_SECTION_NAME_P(NAME) \
  60 @@ -7619,7 +7627,9 @@ _bfd_mips_elf_check_relocs (bfd *abfd, s
  61
  62               /* We need a stub, not a plt entry for the undefined
  63                  function.  But we record it as if it needs plt.  See
  64 -                _bfd_elf_adjust_dynamic_symbol.  */
  65 +                _bfd_elf_adjust_dynamic_symbol.  Note that these relocations
  66 +                are always used for PIC calls, even when using the new
  67 +                non-PIC ABI.  */
  68               h->needs_plt = 1;
  69               h->type = STT_FUNC;
  70             }
  71 @@ -7725,6 +7735,8 @@ _bfd_mips_elf_check_relocs (bfd *abfd, s
  72         case R_MIPS_32:
  73         case R_MIPS_REL32:
  74         case R_MIPS_64:
  75 +         if (h != NULL)
  76 +           h->non_got_ref = TRUE;
  77           /* In VxWorks executables, references to external symbols
  78              are handled using copy relocs or PLT stubs, so there's
  79              no need to add a .rela.dyn entry for this relocation.  */
  80 @@ -7780,11 +7792,21 @@ _bfd_mips_elf_check_relocs (bfd *abfd, s
  81         case R_MIPS_GPREL16:
  82         case R_MIPS_LITERAL:
  83         case R_MIPS_GPREL32:
  84 +         if (h != NULL
  85 +             && (r_type == R_MIPS_GPREL16 || r_type == R_MIPS_GPREL32))
  86 +           h->non_got_ref = TRUE;
  87 +
  88           if (SGI_COMPAT (abfd))
  89             mips_elf_hash_table (info)->compact_rel_size +=
  90               sizeof (Elf32_External_crinfo);
  91           break;
  92
  93 +       case R_MIPS_HI16:
  94 +       case R_MIPS_LO16:
  95 +         if (h != NULL && strcmp (h->root.root.string, "_gp_disp") != 0)
  96 +           h->non_got_ref = TRUE;
  97 +         break;
  98 +
  99           /* This relocation describes the C++ object vtable hierarchy.
 100              Reconstruct it for later use during GC.  */
 101         case R_MIPS_GNU_VTINHERIT:
 102 @@ -7807,20 +7829,20 @@ _bfd_mips_elf_check_relocs (bfd *abfd, s
 103
 104        /* We must not create a stub for a symbol that has relocations
 105          related to taking the function's address.  This doesn't apply to
 106 -        VxWorks, where CALL relocs refer to a .got.plt entry instead of
 107 -        a normal .got entry.  */
 108 +        VxWorks or the non-PIC ABI, where CALL relocs refer to a
 109 +        .got.plt entry instead of a normal .got entry.  */
 110        if (!htab->is_vxworks && h != NULL)
 111         switch (r_type)
 112           {
 113 -         default:
 114 -           ((struct mips_elf_link_hash_entry *) h)->no_fn_stub = TRUE;
 115 -           break;
 116           case R_MIPS16_CALL16:
 117           case R_MIPS_CALL16:
 118           case R_MIPS_CALL_HI16:
 119           case R_MIPS_CALL_LO16:
 120           case R_MIPS_JALR:
 121             break;
 122 +         default:
 123 +           ((struct mips_elf_link_hash_entry *) h)->no_fn_stub = TRUE;
 124 +           break;
 125           }
 126
 127        /* See if this reloc would need to refer to a MIPS16 hard-float stub,
 128 @@ -12514,7 +12536,9 @@ _bfd_mips_elf_merge_private_bfd_data (bf
 129           break;
 130         }
 131      }
 132 -  if (null_input_bfd)
 133 +  /* Dynamic objects normally have no sections, and do not reach
 134 +     here - but they might if used as DYNOBJ.  */
 135 +  if (null_input_bfd || (ibfd->flags & DYNAMIC) != 0)
 136      return TRUE;
 137
 138    ok = TRUE;
 139 --- a/bfd/elfxx-mips.h
 140 +++ b/bfd/elfxx-mips.h
 141 @@ -63,6 +63,9 @@ extern bfd_boolean _bfd_mips_elf_finish_
 142  extern bfd_boolean _bfd_mips_vxworks_finish_dynamic_symbol
 143    (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
 144     Elf_Internal_Sym *);
 145 +extern bfd_boolean _bfd_mips_nonpic_finish_dynamic_symbol
 146 +  (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
 147 +   Elf_Internal_Sym *);
 148  extern bfd_boolean _bfd_mips_elf_finish_dynamic_sections
 149    (bfd *, struct bfd_link_info *);
 150  extern void _bfd_mips_elf_final_write_processing
 151 @@ -153,6 +156,15 @@ extern const struct bfd_elf_special_sect
 152
 153  extern bfd_boolean _bfd_mips_elf_common_definition (Elf_Internal_Sym *);
 154
 155 +extern bfd_vma _bfd_mips_elf_plt_sym_val
 156 +  (bfd_vma, const asection *, const arelent *);
 157 +extern void _bfd_mips_elf_begin_write_processing
 158 +  (bfd *abfd, struct bfd_link_info *link_info);
 159 +extern bfd_boolean bfd_mips_elf_maybe_create_non_pic_to_pic_stubs_section
 160 +  (struct bfd_link_info *);
 161 +extern void _bfd_mips_post_process_headers
 162 +  (bfd *abfd, struct bfd_link_info *link_info);
 163 +
 164  #define elf_backend_common_definition   _bfd_mips_elf_common_definition
 165  #define elf_backend_name_local_section_symbols \
 166    _bfd_mips_elf_name_local_section_symbols
 167 --- a/gas/config/tc-mips.c
 168 +++ b/gas/config/tc-mips.c
 169 @@ -1891,6 +1891,12 @@ md_begin (void)
 170         as_bad (_("-G may not be used in position-independent code"));
 171        g_switch_value = 0;
 172      }
 173 +  else if (mips_abicalls)
 174 +    {
 175 +      if (g_switch_seen && g_switch_value != 0)
 176 +       as_bad (_("-G may not be used with abicalls"));
 177 +      g_switch_value = 0;
 178 +    }
 179
 180    if (! bfd_set_arch_mach (stdoutput, bfd_arch_mips, file_mips_arch))
 181      as_warn (_("Could not set architecture and machine"));
 182 @@ -11258,6 +11264,7 @@ enum options
 183      OPTION_PDR,
 184      OPTION_NO_PDR,
 185      OPTION_MVXWORKS_PIC,
 186 +    OPTION_NON_PIC_ABICALLS,
 187  #endif /* OBJ_ELF */
 188      OPTION_END_OF_ENUM
 189    };
 190 @@ -11359,6 +11366,7 @@ struct option md_longopts[] =
 191    {"mpdr", no_argument, NULL, OPTION_PDR},
 192    {"mno-pdr", no_argument, NULL, OPTION_NO_PDR},
 193    {"mvxworks-pic", no_argument, NULL, OPTION_MVXWORKS_PIC},
 194 +  {"mnon-pic-abicalls", no_argument, NULL, OPTION_NON_PIC_ABICALLS},
 195  #endif /* OBJ_ELF */
 196
 197    {NULL, no_argument, NULL, 0}
 198 @@ -11783,6 +11791,11 @@ md_parse_option (int c, char *arg)
 199      case OPTION_MVXWORKS_PIC:
 200        mips_pic = VXWORKS_PIC;
 201        break;
 202 +
 203 +    case OPTION_NON_PIC_ABICALLS:
 204 +      mips_pic = NO_PIC;
 205 +      mips_abicalls = TRUE;
 206 +      break;
 207  #endif /* OBJ_ELF */
 208
 209      default: