diff options
Diffstat (limited to 'bfd/elf32-sh.c')
| -rw-r--r-- | bfd/elf32-sh.c | 1834 |
1 files changed, 1820 insertions, 14 deletions
diff --git a/bfd/elf32-sh.c b/bfd/elf32-sh.c index 1f756ee..acbf661 100644 --- a/bfd/elf32-sh.c +++ b/bfd/elf32-sh.c @@ -55,6 +55,27 @@ static boolean sh_elf_relocate_section static bfd_byte *sh_elf_get_relocated_section_contents PARAMS ((bfd *, struct bfd_link_info *, struct bfd_link_order *, bfd_byte *, boolean, asymbol **)); +static boolean sh_elf_check_relocs + PARAMS ((bfd *, struct bfd_link_info *, asection *, + const Elf_Internal_Rela *)); +static struct bfd_hash_entry *sh_elf_link_hash_newfunc + PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); +static struct bfd_link_hash_table *sh_elf_link_hash_table_create + PARAMS ((bfd *)); +static boolean sh_elf_adjust_dynamic_symbol + PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); +static boolean sh_elf_size_dynamic_sections + PARAMS ((bfd *, struct bfd_link_info *)); +static boolean sh_elf_finish_dynamic_symbol + PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, + Elf_Internal_Sym *)); +static boolean sh_elf_finish_dynamic_sections + PARAMS ((bfd *, struct bfd_link_info *)); + +/* The name of the dynamic interpreter. This is put in the .interp + section. */ + +#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" static reloc_howto_type sh_elf_howto_table[] = { @@ -215,14 +236,118 @@ static reloc_howto_type sh_elf_howto_table[] = 0xff, /* dst_mask */ true), /* pcrel_offset */ - EMPTY_HOWTO (10), - EMPTY_HOWTO (11), - EMPTY_HOWTO (12), - EMPTY_HOWTO (13), - EMPTY_HOWTO (14), - EMPTY_HOWTO (15), - EMPTY_HOWTO (16), - EMPTY_HOWTO (17), + HOWTO (R_SH_GOT32, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* */ + "R_SH_GOT32", /* name */ + true, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + false), /* pcrel_offset */ + + HOWTO (R_SH_PLT32, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + true, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* */ + "R_SH_PLT32", /* name */ + true, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + true), /* pcrel_offset */ + + HOWTO (R_SH_COPY, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* */ + "R_SH_COPY", /* name */ + true, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + false), /* pcrel_offset */ + + HOWTO (R_SH_GLOB_DAT, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* */ + "R_SH_GLOB_DAT", /* name */ + true, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + false), /* pcrel_offset */ + + HOWTO (R_SH_JMP_SLOT, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* */ + "R_SH_JMP_SLOT", /* name */ + true, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + false), /* pcrel_offset */ + + HOWTO (R_SH_RELATIVE, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* */ + "R_SH_RELATIVE", /* name */ + true, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + false), /* pcrel_offset */ + + HOWTO (R_SH_GOTOFF, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* */ + "R_SH_GOTOFF", /* name */ + true, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + false), /* pcrel_offset */ + + HOWTO (R_SH_GOTPC, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + true, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* */ + "R_SH_GOTPC", /* name */ + true, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + true), /* pcrel_offset */ + EMPTY_HOWTO (18), EMPTY_HOWTO (19), EMPTY_HOWTO (20), @@ -687,6 +812,14 @@ static const struct elf_reloc_map sh_reloc_map[] = { BFD_RELOC_VTABLE_ENTRY, R_SH_GNU_VTENTRY }, { BFD_RELOC_SH_LOOP_START, R_SH_LOOP_START }, { BFD_RELOC_SH_LOOP_END, R_SH_LOOP_END }, + { BFD_RELOC_32_GOT_PCREL, R_SH_GOT32 }, + { BFD_RELOC_32_PLT_PCREL, R_SH_PLT32 }, + { BFD_RELOC_SH_COPY, R_SH_COPY }, + { BFD_RELOC_SH_GLOB_DAT, R_SH_GLOB_DAT }, + { BFD_RELOC_SH_JMP_SLOT, R_SH_JMP_SLOT }, + { BFD_RELOC_SH_RELATIVE, R_SH_RELATIVE }, + { BFD_RELOC_32_GOTOFF, R_SH_GOTOFF }, + { BFD_RELOC_SH_GOTPC, R_SH_GOTPC }, }; /* Given a BFD reloc code, return the howto structure for the @@ -1819,6 +1952,771 @@ sh_elf_swap_insns (abfd, sec, relocs, contents, addr) return true; } +/* The size in bytes of an entry in the procedure linkage table. */ + +#define PLT_ENTRY_SIZE 28 + +/* First entry in an absolute procedure linkage table look like this. */ + +static const bfd_byte elf_sh_plt0_entry_be[PLT_ENTRY_SIZE] = +{ + 0xd0, 0x04, /* mov.l 1f,r0 */ + 0xd2, 0x05, /* mov.l 2f,r2 */ + 0x60, 0x02, /* mov.l @r0,r0 */ + 0x62, 0x22, /* mov.l @r2,r2 */ + 0x40, 0x2b, /* jmp @r0 */ + 0xe0, 0x00, /* mov #0,r0 */ + 0x00, 0x09, /* nop */ + 0x00, 0x09, /* nop */ + 0x00, 0x09, /* nop */ + 0x00, 0x09, /* nop */ + 0, 0, 0, 0, /* 1: replaced with address of .got.plt + 8. */ + 0, 0, 0, 0, /* 2: replaced with address of .got.plt + 4. */ +}; + +static const bfd_byte elf_sh_plt0_entry_le[PLT_ENTRY_SIZE] = +{ + 0x04, 0xd0, /* mov.l 1f,r0 */ + 0x05, 0xd2, /* mov.l 2f,r2 */ + 0x02, 0x60, /* mov.l @r0,r0 */ + 0x22, 0x62, /* mov.l @r2,r2 */ + 0x2b, 0x40, /* jmp @r0 */ + 0x00, 0xe0, /* mov #0,r0 */ + 0x09, 0x00, /* nop */ + 0x09, 0x00, /* nop */ + 0x09, 0x00, /* nop */ + 0x09, 0x00, /* nop */ + 0, 0, 0, 0, /* 1: replaced with address of .got.plt + 8. */ + 0, 0, 0, 0, /* 2: replaced with address of .got.plt + 4. */ +}; + +/* Sebsequent entries in an absolute procedure linkage table look like + this. */ + +static const bfd_byte elf_sh_plt_entry_be[PLT_ENTRY_SIZE] = +{ + 0xd0, 0x04, /* mov.l 1f,r0 */ + 0x60, 0x02, /* mov.l @r0,r0 */ + 0xd2, 0x02, /* mov.l 0f,r2 */ + 0x40, 0x2b, /* jmp @r0 */ + 0x60, 0x23, /* mov r2,r0 */ + 0xd1, 0x03, /* mov.l 2f,r1 */ + 0x40, 0x2b, /* jmp @r0 */ + 0x00, 0x09, /* nop */ + 0, 0, 0, 0, /* 0: replaced with address of .PLT0. */ + 0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */ + 0, 0, 0, 0, /* 2: replaced with offset into relocation table. */ +}; + +static const bfd_byte elf_sh_plt_entry_le[PLT_ENTRY_SIZE] = +{ + 0x04, 0xd0, /* mov.l 1f,r0 */ + 0x02, 0x60, /* mov.l @r0,r0 */ + 0x02, 0xd2, /* mov.l 0f,r2 */ + 0x2b, 0x40, /* jmp @r0 */ + 0x23, 0x60, /* mov r2,r0 */ + 0x03, 0xd1, /* mov.l 2f,r1 */ + 0x2b, 0x40, /* jmp @r0 */ + 0x09, 0x00, /* nop */ + 0, 0, 0, 0, /* 0: replaced with address of .PLT. */ + 0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */ + 0, 0, 0, 0, /* 2: replaced with offset into relocation table. */ +}; + +/* Entries in a PIC procedure linkage table look like this. */ + +static const bfd_byte elf_sh_pic_plt_entry_be[PLT_ENTRY_SIZE] = +{ + 0xd0, 0x04, /* mov.l 1f,r0 */ + 0x00, 0xce, /* mov.l @(r0,r12),r0 */ + 0x40, 0x2b, /* jmp @r0 */ + 0x00, 0x09, /* nop */ + 0x50, 0xc2, /* 0: mov.l @(8,r12),r0 */ + 0x52, 0xc1, /* 1: mov.l @(4,r12),r2 */ + 0xd1, 0x02, /* mov.l 2f,r1 */ + 0x40, 0x2b, /* jmp @r0 */ + 0xe0, 0x00, /* mov #0,r0 ! shows the type of PLT. */ + 0x00, 0x09, /* nop */ + 0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */ + 0, 0, 0, 0 /* 2: replaced with offset into relocation table. */ +}; + +static const bfd_byte elf_sh_pic_plt_entry_le[PLT_ENTRY_SIZE] = +{ + 0x04, 0xd0, /* mov.l 1f,r0 */ + 0xce, 0x00, /* mov.l @(r0,r12),r0 */ + 0x2b, 0x40, /* jmp @r0 */ + 0x09, 0x00, /* nop */ + 0xc2, 0x50, /* 0: mov.l @(8,r12),r0 */ + 0xc1, 0x52, /* 1: mov.l @(4,r12),r2 */ + 0x02, 0xd1, /* mov.l 2f,r1 */ + 0x2b, 0x40, /* jmp @r0 */ + 0x00, 0xe0, /* mov #0,r0 ! shows the type of PLT. */ + 0x09, 0x00, /* nop */ + 0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */ + 0, 0, 0, 0 /* 2: replaced with offset into relocation table. */ +}; + +static const bfd_byte *elf_sh_plt0_entry; +static const bfd_byte *elf_sh_plt_entry; +static const bfd_byte *elf_sh_pic_plt_entry; + +/* Return size of a PLT entry. */ +#define elf_sh_sizeof_plt(info) PLT_ENTRY_SIZE + +/* Return offset of the PLT0 address in an absolute PLT entry. */ +#define elf_sh_plt_plt0_offset(info) 16 + +/* Return offset of the linker in PLT0 entry. */ +#define elf_sh_plt0_linker_offset(info) 20 + +/* Return offset of the GOT id in PLT0 entry. */ +#define elf_sh_plt0_gotid_offset(info) 24 + +/* Return offset of the tempoline in PLT entry */ +#define elf_sh_plt_temp_offset(info) 8 + +/* Return offset of the symbol in PLT entry. */ +#define elf_sh_plt_symbol_offset(info) 20 + +/* Return offset of the relocation in PLT entry. */ +#define elf_sh_plt_reloc_offset(info) 24 + +/* The sh linker needs to keep track of the number of relocs that it + decides to copy in check_relocs for each symbol. This is so that + it can discard PC relative relocs if it doesn't need them when + linking with -Bsymbolic. We store the information in a field + extending the regular ELF linker hash table. */ + +/* This structure keeps track of the number of PC relative relocs we + have copied for a given symbol. */ + +struct elf_sh_pcrel_relocs_copied +{ + /* Next section. */ + struct elf_sh_pcrel_relocs_copied *next; + /* A section in dynobj. */ + asection *section; + /* Number of relocs copied in this section. */ + bfd_size_type count; +}; + +/* sh ELF linker hash entry. */ + +struct elf_sh_link_hash_entry +{ + struct elf_link_hash_entry root; + + /* Number of PC relative relocs copied for this symbol. */ + struct elf_sh_pcrel_relocs_copied *pcrel_relocs_copied; +}; + +/* sh ELF linker hash table. */ + +struct elf_sh_link_hash_table +{ + struct elf_link_hash_table root; +}; + +/* Declare this now that the above structures are defined. */ + +static boolean sh_elf_discard_copies + PARAMS ((struct elf_sh_link_hash_entry *, PTR)); + +/* Traverse an sh ELF linker hash table. */ + +#define sh_elf_link_hash_traverse(table, func, info) \ + (elf_link_hash_traverse \ + (&(table)->root, \ + (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ + (info))) + +/* Get the sh ELF linker hash table from a link_info structure. */ + +#define sh_elf_hash_table(p) \ + ((struct elf_sh_link_hash_table *) ((p)->hash)) + +/* Create an entry in an sh ELF linker hash table. */ + +static struct bfd_hash_entry * +sh_elf_link_hash_newfunc (entry, table, string) + struct bfd_hash_entry *entry; + struct bfd_hash_table *table; + const char *string; +{ + struct elf_sh_link_hash_entry *ret = + (struct elf_sh_link_hash_entry *) entry; + + /* Allocate the structure if it has not already been allocated by a + subclass. */ + if (ret == (struct elf_sh_link_hash_entry *) NULL) + ret = ((struct elf_sh_link_hash_entry *) + bfd_hash_allocate (table, + sizeof (struct elf_sh_link_hash_entry))); + if (ret == (struct elf_sh_link_hash_entry *) NULL) + return (struct bfd_hash_entry *) ret; + + /* Call the allocation method of the superclass. */ + ret = ((struct elf_sh_link_hash_entry *) + _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, + table, string)); + if (ret != (struct elf_sh_link_hash_entry *) NULL) + { + ret->pcrel_relocs_copied = NULL; + } + + return (struct bfd_hash_entry *) ret; +} + +/* Create an sh ELF linker hash table. */ + +static struct bfd_link_hash_table * +sh_elf_link_hash_table_create (abfd) + bfd *abfd; +{ + struct elf_sh_link_hash_table *ret; + + ret = ((struct elf_sh_link_hash_table *) + bfd_alloc (abfd, sizeof (struct elf_sh_link_hash_table))); + if (ret == (struct elf_sh_link_hash_table *) NULL) + return NULL; + + if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, + sh_elf_link_hash_newfunc)) + { + bfd_release (abfd, ret); + return NULL; + } + + return &ret->root.root; +} + +/* Create dynamic sections when linking against a dynamic object. */ + +static boolean +sh_elf_create_dynamic_sections (abfd, info) + bfd *abfd; + struct bfd_link_info *info; +{ + flagword flags, pltflags; + register asection *s; + struct elf_backend_data *bed = get_elf_backend_data (abfd); + int ptralign = 0; + + switch (bed->s->arch_size) + { + case 32: + ptralign = 2; + break; + + case 64: + ptralign = 3; + break; + + default: + bfd_set_error (bfd_error_bad_value); + return false; + } + + /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and + .rel[a].bss sections. */ + + flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY + | SEC_LINKER_CREATED); + + pltflags = flags; + pltflags |= SEC_CODE; + if (bed->plt_not_loaded) + pltflags &= ~ (SEC_LOAD | SEC_HAS_CONTENTS); + if (bed->plt_readonly) + pltflags |= SEC_READONLY; + + s = bfd_make_section (abfd, ".plt"); + if (s == NULL + || ! bfd_set_section_flags (abfd, s, pltflags) + || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment)) + return false; + + if (bed->want_plt_sym) + { + /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the + .plt section. */ + struct elf_link_hash_entry *h = NULL; + if (! (_bfd_generic_link_add_one_symbol + (info, abfd, "_PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL, s, + (bfd_vma) 0, (const char *) NULL, false, + get_elf_backend_data (abfd)->collect, + (struct bfd_link_hash_entry **) &h))) + return false; + h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; + h->type = STT_OBJECT; + + if (info->shared + && ! _bfd_elf_link_record_dynamic_symbol (info, h)) + return false; + } + + s = bfd_make_section (abfd, + bed->default_use_rela_p ? ".rela.plt" : ".rel.plt"); + if (s == NULL + || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) + || ! bfd_set_section_alignment (abfd, s, ptralign)) + return false; + + if (! _bfd_elf_create_got_section (abfd, info)) + return false; + + { + const char *secname; + char *relname; + flagword secflags; + asection *sec; + + for (sec = abfd->sections; sec; sec = sec->next) + { + secflags = bfd_get_section_flags (abfd, sec); + if ((secflags & (SEC_DATA | SEC_LINKER_CREATED)) + || ((secflags & SEC_HAS_CONTENTS) != SEC_HAS_CONTENTS)) + continue; + secname = bfd_get_section_name (abfd, sec); + relname = (char *) bfd_malloc (strlen (secname) + 6); + strcpy (relname, ".rela"); + strcat (relname, secname); + s = bfd_make_section (abfd, relname); + if (s == NULL + || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) + || ! bfd_set_section_alignment (abfd, s, ptralign)) + return false; + } + } + + if (bed->want_dynbss) + { + /* The .dynbss section is a place to put symbols which are defined + by dynamic objects, are referenced by regular objects, and are + not functions. We must allocate space for them in the process + image and use a R_*_COPY reloc to tell the dynamic linker to + initialize them at run time. The linker script puts the .dynbss + section into the .bss section of the final image. */ + s = bfd_make_section (abfd, ".dynbss"); + if (s == NULL + || ! bfd_set_section_flags (abfd, s, SEC_ALLOC)) + return false; + + /* The .rel[a].bss section holds copy relocs. This section is not + normally needed. We need to create it here, though, so that the + linker will map it to an output section. We can't just create it + only if we need it, because we will not know whether we need it + until we have seen all the input files, and the first time the + main linker code calls BFD after examining all the input files + (size_dynamic_sections) the input sections have already been + mapped to the output sections. If the section turns out not to + be needed, we can discard it later. We will never need this + section when generating a shared object, since they do not use + copy relocs. */ + if (! info->shared) + { + s = bfd_make_section (abfd, + (bed->default_use_rela_p + ? ".rela.bss" : ".rel.bss")); + if (s == NULL + || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) + || ! bfd_set_section_alignment (abfd, s, ptralign)) + return false; + } + } + + return true; +} + + +/* Adjust a symbol defined by a dynamic object and referenced by a + regular object. The current definition is in some section of the + dynamic object, but we're not including those sections. We have to + change the definition to something the rest of the link can + understand. */ + +static boolean +sh_elf_adjust_dynamic_symbol (info, h) + struct bfd_link_info *info; + struct elf_link_hash_entry *h; +{ + bfd *dynobj; + asection *s; + unsigned int power_of_two; + + dynobj = elf_hash_table (info)->dynobj; + + /* Make sure we know what is going on here. */ + BFD_ASSERT (dynobj != NULL + && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) + || h->weakdef != NULL + || ((h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_DYNAMIC) != 0 + && (h->elf_link_hash_flags + & ELF_LINK_HASH_REF_REGULAR) != 0 + && (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0))); + + /* If this is a function, put it in the procedure linkage table. We + will fill in the contents of the procedure linkage table later, + when we know the address of the .got section. */ + if (h->type == STT_FUNC + || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) + { + if (! info->shared + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 + && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0) + { + /* This case can occur if we saw a PLT reloc in an input + file, but the symbol was never referred to by a dynamic + object. In such a case, we don't actually need to build + a procedure linkage table, and we can just do a REL32 + reloc instead. */ + BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); + return true; + } + + /* Make sure this symbol is output as a dynamic symbol. */ + if (h->dynindx == -1) + { + if (! bfd_elf32_link_record_dynamic_symbol (info, h)) + return false; + } + + s = bfd_get_section_by_name (dynobj, ".plt"); + BFD_ASSERT (s != NULL); + + /* If this is the first .plt entry, make room for the special + first entry. */ + if (s->_raw_size == 0) + s->_raw_size += PLT_ENTRY_SIZE; + + /* If this symbol is not defined in a regular file, and we are + not generating a shared library, then set the symbol to this + location in the .plt. This is required to make function + pointers compare as equal between the normal executable and + the shared library. */ + if (! info->shared + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) + { + h->root.u.def.section = s; + h->root.u.def.value = s->_raw_size; + } + + h->plt.offset = s->_raw_size; + + /* Make room for this entry. */ + s->_raw_size += elf_sh_sizeof_plt (info); + + /* We also need to make an entry in the .got.plt section, which + will be placed in the .got section by the linker script. */ + + s = bfd_get_section_by_name (dynobj, ".got.plt"); + BFD_ASSERT (s != NULL); + s->_raw_size += 4; + + /* We also need to make an entry in the .rela.plt section. */ + + s = bfd_get_section_by_name (dynobj, ".rela.plt"); + BFD_ASSERT (s != NULL); + s->_raw_size += sizeof (Elf32_External_Rela); + + return true; + } + + /* If this is a weak symbol, and there is a real definition, the + processor independent code will have arranged for us to see the + real definition first, and we can just use the same value. */ + if (h->weakdef != NULL) + { + BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined + || h->weakdef->root.type == bfd_link_hash_defweak); + h->root.u.def.section = h->weakdef->root.u.def.section; + h->root.u.def.value = h->weakdef->root.u.def.value; + return true; + } + + /* This is a reference to a symbol defined by a dynamic object which + is not a function. */ + + /* If we are creating a shared library, we must presume that the + only references to the symbol are via the global offset table. + For such cases we need not do anything here; the relocations will + be handled correctly by relocate_section. */ + if (info->shared) + return true; + + /* If there are no references to this symbol that do not use the + GOT, we don't need to generate a copy reloc. */ + if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) + return true; + + /* We must allocate the symbol in our .dynbss section, which will + become part of the .bss section of the executable. There will be + an entry for this symbol in the .dynsym section. The dynamic + object will contain position independent code, so all references + from the dynamic object to this symbol will go through the global + offset table. The dynamic linker will use the .dynsym entry to + determine the address it must put in the global offset table, so + both the dynamic object and the regular object will refer to the + same memory location for the variable. */ + + s = bfd_get_section_by_name (dynobj, ".dynbss"); + BFD_ASSERT (s != NULL); + + /* We must generate a R_SH_COPY reloc to tell the dynamic linker to + copy the initial value out of the dynamic object and into the + runtime process image. We need to remember the offset into the + .rela.bss section we are going to use. */ + if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) + { + asection *srel; + + srel = bfd_get_section_by_name (dynobj, ".rela.bss"); + BFD_ASSERT (srel != NULL); + srel->_raw_size += sizeof (Elf32_External_Rela); + h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; + } + + /* We need to figure out the alignment required for this symbol. I + have no idea how ELF linkers handle this. */ + power_of_two = bfd_log2 (h->size); + if (power_of_two > 3) + power_of_two = 3; + + /* Apply the required alignment. */ + s->_raw_size = BFD_ALIGN (s->_raw_size, + (bfd_size_type) (1 << power_of_two)); + if (power_of_two > bfd_get_section_alignment (dynobj, s)) + { + if (! bfd_set_section_alignment (dynobj, s, power_of_two)) + return false; + } + + /* Define the symbol as being at this point in the section. */ + h->root.u.def.section = s; + h->root.u.def.value = s->_raw_size; + + /* Increment the section size to make room for the symbol. */ + s->_raw_size += h->size; + + return true; +} + +/* Set the sizes of the dynamic sections. */ + +static boolean +sh_elf_size_dynamic_sections (output_bfd, info) + bfd *output_bfd; + struct bfd_link_info *info; +{ + bfd *dynobj; + asection *s; + boolean plt; + boolean relocs; + boolean reltext; + + dynobj = elf_hash_table (info)->dynobj; + BFD_ASSERT (dynobj != NULL); + + if (elf_hash_table (info)->dynamic_sections_created) + { + /* Set the contents of the .interp section to the interpreter. */ + if (! info->shared) + { + s = bfd_get_section_by_name (dynobj, ".interp"); + BFD_ASSERT (s != NULL); + s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; + s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; + } + } + else + { + /* We may have created entries in the .rela.got section. + However, if we are not creating the dynamic sections, we will + not actually use these entries. Reset the size of .rela.got, + which will cause it to get stripped from the output file + below. */ + s = bfd_get_section_by_name (dynobj, ".rela.got"); + if (s != NULL) + s->_raw_size = 0; + } + + /* If this is a -Bsymbolic shared link, then we need to discard all + PC relative relocs against symbols defined in a regular object. + We allocated space for them in the check_relocs routine, but we + will not fill them in in the relocate_section routine. */ + if (info->shared && info->symbolic) + sh_elf_link_hash_traverse (sh_elf_hash_table (info), + sh_elf_discard_copies, + (PTR) NULL); + + /* The check_relocs and adjust_dynamic_symbol entry points have + determined the sizes of the various dynamic sections. Allocate + memory for them. */ + plt = false; + relocs = false; + reltext = false; + for (s = dynobj->sections; s != NULL; s = s->next) + { + const char *name; + boolean strip; + + if ((s->flags & SEC_LINKER_CREATED) == 0) + continue; + + /* It's OK to base decisions on the section name, because none + of the dynobj section names depend upon the input files. */ + name = bfd_get_section_name (dynobj, s); + + strip = false; + + if (strcmp (name, ".plt") == 0) + { + if (s->_raw_size == 0) + { + /* Strip this section if we don't need it; see the + comment below. */ + strip = true; + } + else + { + /* Remember whether there is a PLT. */ + plt = true; + } + } + else if (strncmp (name, ".rela", 5) == 0) + { + if (s->_raw_size == 0) + { + /* If we don't need this section, strip it from the + output file. This is mostly to handle .rela.bss and + .rela.plt. We must create both sections in + create_dynamic_sections, because they must be created + before the linker maps input sections to output + sections. The linker does that before + adjust_dynamic_symbol is called, and it is that + function which decides whether anything needs to go + into these sections. */ + strip = true; + } + else + { + asection *target; + + /* Remember whether there are any reloc sections other + than .rela.plt. */ + if (strcmp (name, ".rela.plt") != 0) + { + const char *outname; + + relocs = true; + + /* If this relocation section applies to a read only + section, then we probably need a DT_TEXTREL + entry. The entries in the .rela.plt section + really apply to the .got section, which we + created ourselves and so know is not readonly. */ + outname = bfd_get_section_name (output_bfd, + s->output_section); + target = bfd_get_section_by_name (output_bfd, outname + 5); + if (target != NULL + && (target->flags & SEC_READONLY) != 0 + && (target->flags & SEC_ALLOC) != 0) + reltext = true; + } + + /* We use the reloc_count field as a counter if we need + to copy relocs into the output file. */ + s->reloc_count = 0; + } + } + else if (strncmp (name, ".got", 4) != 0) + { + /* It's not one of our sections, so don't allocate space. */ + continue; + } + + if (strip) + { + _bfd_strip_section_from_output (info, s); + continue; + } + + /* Allocate memory for the section contents. */ + s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size); + if (s->contents == NULL && s->_raw_size != 0) + return false; + } + + if (elf_hash_table (info)->dynamic_sections_created) + { + /* Add some entries to the .dynamic section. We fill in the + values later, in sh_elf_finish_dynamic_sections, but we + must add the entries now so that we get the correct size for + the .dynamic section. The DT_DEBUG entry is filled in by the + dynamic linker and used by the debugger. */ + if (! info->shared) + { + if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) + return false; + } + + if (plt) + { + if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) + || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) + || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA) + || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) + return false; + } + + if (relocs) + { + if (! bfd_elf32_add_dynamic_entry (info, DT_RELA, 0) + || ! bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0) + || ! bfd_elf32_add_dynamic_entry (info, DT_RELAENT, + sizeof (Elf32_External_Rela))) + return false; + } + + if (reltext) + { + if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) + return false; + } + } + + return true; +} + +/* This function is called via sh_elf_link_hash_traverse if we are + creating a shared object with -Bsymbolic. It discards the space + allocated to copy PC relative relocs against symbols which are + defined in regular objects. We allocated space for them in the + check_relocs routine, but we won't fill them in in the + relocate_section routine. */ + +/*ARGSUSED*/ +static boolean +sh_elf_discard_copies (h, ignore) + struct elf_sh_link_hash_entry *h; + PTR ignore ATTRIBUTE_UNUSED; +{ + struct elf_sh_pcrel_relocs_copied *s; + + /* We only discard relocs for symbols defined in a regular object. */ + if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) + return true; + + for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) + s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela); + + return true; +} + + /* Relocate an SH ELF section. */ static boolean @@ -1836,9 +2734,20 @@ sh_elf_relocate_section (output_bfd, info, input_bfd, input_section, Elf_Internal_Shdr *symtab_hdr; struct elf_link_hash_entry **sym_hashes; Elf_Internal_Rela *rel, *relend; + bfd *dynobj; + bfd_vma *local_got_offsets; + asection *sgot; + asection *splt; + asection *sreloc; symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; sym_hashes = elf_sym_hashes (input_bfd); + dynobj = elf_hash_table (info)->dynobj; + local_got_offsets = elf_local_got_offsets (input_bfd); + + sgot = NULL; + splt = NULL; + sreloc = NULL; rel = relocs; relend = relocs + input_section->reloc_count; @@ -1916,12 +2825,55 @@ sh_elf_relocate_section (output_bfd, info, input_bfd, input_section, || h->root.type == bfd_link_hash_defweak) { sec = h->root.u.def.section; - relocation = (h->root.u.def.value - + sec->output_section->vma - + sec->output_offset); + /* In these cases, we don't need the relocation value. + We check specially because in some obscure cases + sec->output_section will be NULL. */ + if (r_type == R_SH_GOTPC + || (r_type == R_SH_PLT32 + && h->plt.offset != (bfd_vma) -1) + || (r_type == R_SH_GOT32 + && elf_hash_table (info)->dynamic_sections_created + && (! info->shared + || (! info->symbolic && h->dynindx != -1) + || (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0)) + /* The cases above are those in which relocation is + overwritten in the switch block below. The cases + below are those in which we must defer relocation + to run-time, because we can't resolve absolute + addresses when creating a shared library. */ + || (info->shared + && ((! info->symbolic && h->dynindx != -1) + || (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0) + && ((r_type == R_SH_DIR32 + && !(ELF_ST_VISIBILITY (h->other) == STV_INTERNAL + || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)) + || r_type == R_SH_REL32) + && ((input_section->flags & SEC_ALLOC) != 0 + /* DWARF will emit R_SH_DIR32 relocations in its + sections against symbols defined externally + in shared libraries. We can't do anything + with them here. */ + || (input_section->flags & SEC_DEBUGGING) != 0))) + relocation = 0; + else if (sec->output_section == NULL) + { + (*_bfd_error_handler) + (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"), + bfd_get_filename (input_bfd), h->root.root.string, + bfd_get_section_name (input_bfd, input_section)); + relocation = 0; + } + else + relocation = (h->root.u.def.value + + sec->output_section->vma + + sec->output_offset); } else if (h->root.type == bfd_link_hash_undefweak) relocation = 0; + else if (info->shared && !info->symbolic && !info->no_undefined) + relocation = 0; else { if (! ((*info->callbacks->undefined_symbol) @@ -1957,7 +2909,271 @@ sh_elf_relocate_section (output_bfd, info, input_bfd, input_section, return false; case R_SH_DIR32: - addend = rel->r_addend; + case R_SH_REL32: + if (info->shared + && (input_section->flags & SEC_ALLOC) != 0 + && (r_type != R_SH_REL32 + || (h != NULL + && h->dynindx != -1 + && (! info->symbolic + || (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0)))) + { + Elf_Internal_Rela outrel; + boolean skip, relocate; + + /* When generating a shared object, these relocations + are copied into the output file to be resolved at run + time. */ + + if (sreloc == NULL) + { + const char *name; + + name = (bfd_elf_string_from_elf_section + (input_bfd, + elf_elfheader (input_bfd)->e_shstrndx, + elf_section_data (input_section)->rel_hdr.sh_name)); + if (name == NULL) + return false; + + BFD_ASSERT (strncmp (name, ".rela", 5) == 0 + && strcmp (bfd_get_section_name (input_bfd, + input_section), + name + 5) == 0); + + sreloc = bfd_get_section_by_name (dynobj, name); + BFD_ASSERT (sreloc != NULL); + } + + skip = false; + + if (elf_section_data (input_section)->stab_info == NULL) + outrel.r_offset = rel->r_offset; + else + { + bfd_vma off; + + off = (_bfd_stab_section_offset + (output_bfd, &elf_hash_table (info)->stab_info, + input_section, + &elf_section_data (input_section)->stab_info, + rel->r_offset)); + if (off == (bfd_vma) -1) + skip = true; + outrel.r_offset = off; + } + + outrel.r_offset += (input_section->output_section->vma + + input_section->output_offset); + + if (skip) + { + memset (&outrel, 0, sizeof outrel); + relocate = false; + } + else if (r_type == R_SH_REL32) + { + BFD_ASSERT (h != NULL && h->dynindx != -1); + relocate = false; + outrel.r_info = ELF32_R_INFO (h->dynindx, R_SH_REL32); + outrel.r_addend = rel->r_addend; + } + else + { + /* h->dynindx may be -1 if this symbol was marked to + become local. */ + if (h == NULL + || ((info->symbolic || h->dynindx == -1) + && (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) != 0)) + { + relocate = true; + outrel.r_info = ELF32_R_INFO (0, R_SH_RELATIVE); + outrel.r_addend = relocation + rel->r_addend; + } + else + { + BFD_ASSERT (h->dynindx != -1); + relocate = false; + outrel.r_info = ELF32_R_INFO (h->dynindx, R_SH_DIR32); + outrel.r_addend = relocation + rel->r_addend; + } + } + + bfd_elf32_swap_reloca_out (output_bfd, &outrel, + (((Elf32_External_Rela *) + sreloc->contents) + + sreloc->reloc_count)); + ++sreloc->reloc_count; + + /* If this reloc is against an external symbol, we do + not want to fiddle with the addend. Otherwise, we + need to include the symbol value so that it becomes + an addend for the dynamic reloc. */ + if (! relocate) + continue; + } + else if (r_type == R_SH_DIR32) + addend = rel->r_addend; + goto final_link_relocate; + + case R_SH_GOT32: + /* Relocation is to the entry for this symbol in the global + offset table. */ + if (sgot == NULL) + { + sgot = bfd_get_section_by_name (dynobj, ".got"); + BFD_ASSERT (sgot != NULL); + } + + if (h != NULL) + { + bfd_vma off; + + off = h->got.offset; + BFD_ASSERT (off != (bfd_vma) -1); + + if (! elf_hash_table (info)->dynamic_sections_created + || (info->shared + && (info->symbolic || h->dynindx == -1 + || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL + || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN) + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) + { + /* This is actually a static link, or it is a + -Bsymbolic link and the symbol is defined + locally, or the symbol was forced to be local + because of a version file. We must initialize + this entry in the global offset table. Since the + offset must always be a multiple of 4, we use the + least significant bit to record whether we have + initialized it already. + + When doing a dynamic link, we create a .rela.got + relocation entry to initialize the value. This + is done in the finish_dynamic_symbol routine. */ + if ((off & 1) != 0) + off &= ~1; + else + { + bfd_put_32 (output_bfd, relocation, + sgot->contents + off); + h->got.offset |= 1; + } + } + + relocation = sgot->output_offset + off; + } + else + { + bfd_vma off; + + BFD_ASSERT (local_got_offsets != NULL + && local_got_offsets[r_symndx] != (bfd_vma) -1); + + off = local_got_offsets[r_symndx]; + + /* The offset must always be a multiple of 4. We use + the least significant bit to record whether we have + already generated the necessary reloc. */ + if ((off & 1) != 0) + off &= ~1; + else + { + bfd_put_32 (output_bfd, relocation, sgot->contents + off); + + if (info->shared) + { + asection *srelgot; + Elf_Internal_Rela outrel; + + srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); + BFD_ASSERT (srelgot != NULL); + + outrel.r_offset = (sgot->output_section->vma + + sgot->output_offset + + off); + outrel.r_info = ELF32_R_INFO (0, R_SH_RELATIVE); + outrel.r_addend = relocation; + bfd_elf32_swap_reloca_out (output_bfd, &outrel, + (((Elf32_External_Rela *) + srelgot->contents) + + srelgot->reloc_count)); + ++srelgot->reloc_count; + } + + local_got_offsets[r_symndx] |= 1; + } + + relocation = sgot->output_offset + off; + } + + goto final_link_relocate; + + case R_SH_GOTOFF: + /* Relocation is relative to the start of the global offset + table. */ + + if (sgot == NULL) + { + sgot = bfd_get_section_by_name (dynobj, ".got"); + BFD_ASSERT (sgot != NULL); + } + + /* Note that sgot->output_offset is not involved in this + calculation. We always want the start of .got. If we + defined _GLOBAL_OFFSET_TABLE in a different way, as is + permitted by the ABI, we might have to change this + calculation. */ + relocation -= sgot->output_section->vma; + + goto final_link_relocate; + + case R_SH_GOTPC: + /* Use global offset table as symbol value. */ + + if (sgot == NULL) + { + sgot = bfd_get_section_by_name (dynobj, ".got"); + BFD_ASSERT (sgot != NULL); + } + + relocation = sgot->output_section->vma; + + goto final_link_relocate; + + case R_SH_PLT32: + /* Relocation is to the entry for this symbol in the + procedure linkage table. */ + + /* Resolve a PLT reloc against a local symbol directly, + without using the procedure linkage table. */ + if (h == NULL) + goto final_link_relocate; + + if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL + || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN) + goto final_link_relocate; + + if (h->plt.offset == (bfd_vma) -1) + { + /* We didn't make a PLT entry for this symbol. This + happens when statically linking PIC code, or when + using -Bsymbolic. */ + goto final_link_relocate; + } + + if (splt == NULL) + { + splt = bfd_get_section_by_name (dynobj, ".plt"); + BFD_ASSERT (splt != NULL); + } + + relocation = (splt->output_section->vma + + splt->output_offset + + h->plt.offset); + goto final_link_relocate; case R_SH_LOOP_START: @@ -2193,6 +3409,8 @@ sh_elf_gc_mark_hook (abfd, info, rel, h, sym) return NULL; } +/* Update the got entry reference counts for the section being removed. */ + static boolean sh_elf_gc_sweep_hook (abfd, info, sec, relocs) bfd *abfd ATTRIBUTE_UNUSED; @@ -2200,7 +3418,10 @@ sh_elf_gc_sweep_hook (abfd, info, sec, relocs) asection *sec ATTRIBUTE_UNUSED; const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; { - /* we don't use got and plt entries for sh. */ + /* We use got and plt entries for sh, but it would seem that the + existing SH code does no sort of reference counting or whatnot on + its GOT and PLT entries, so it is not possible to garbage collect + them at this time. */ return true; } @@ -2219,6 +3440,16 @@ sh_elf_check_relocs (abfd, info, sec, relocs) struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; const Elf_Internal_Rela *rel; const Elf_Internal_Rela *rel_end; + bfd *dynobj; + bfd_vma *local_got_offsets; + asection *sgot; + asection *srelgot; + asection *sreloc; + + sgot = NULL; + srelgot = NULL; + sreloc = NULL; + if (info->relocateable) return true; @@ -2229,6 +3460,9 @@ sh_elf_check_relocs (abfd, info, sec, relocs) if (!elf_bad_symtab (abfd)) sym_hashes_end -= symtab_hdr->sh_info; + dynobj = elf_hash_table (info)->dynobj; + local_got_offsets = elf_local_got_offsets (abfd); + rel_end = relocs + sec->reloc_count; for (rel = relocs; rel < rel_end; rel++) { @@ -2241,6 +3475,24 @@ sh_elf_check_relocs (abfd, info, sec, relocs) else h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + /* Some relocs require a global offset table. */ + if (dynobj == NULL) + { + switch (ELF32_R_TYPE (rel->r_info)) + { + case R_SH_GOT32: + case R_SH_GOTOFF: + case R_SH_GOTPC: + elf_hash_table (info)->dynobj = dynobj = abfd; + if (! _bfd_elf_create_got_section (dynobj, info)) + return false; + break; + + default: + break; + } + } + switch (ELF32_R_TYPE (rel->r_info)) { /* This relocation describes the C++ object vtable hierarchy. @@ -2256,6 +3508,211 @@ sh_elf_check_relocs (abfd, info, sec, relocs) if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) return false; break; + + case R_SH_GOT32: + /* This symbol requires a global offset table entry. */ + + if (sgot == NULL) + { + sgot = bfd_get_section_by_name (dynobj, ".got"); + BFD_ASSERT (sgot != NULL); + } + + if (srelgot == NULL + && (h != NULL || info->shared)) + { + srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); + if (srelgot == NULL) + { + srelgot = bfd_make_section (dynobj, ".rela.got"); + if (srelgot == NULL + || ! bfd_set_section_flags (dynobj, srelgot, + (SEC_ALLOC + | SEC_LOAD + | SEC_HAS_CONTENTS + | SEC_IN_MEMORY + | SEC_LINKER_CREATED + | SEC_READONLY)) + || ! bfd_set_section_alignment (dynobj, srelgot, 2)) + return false; + } + } + + if (h != NULL) + { + if (h->got.offset != (bfd_vma) -1) + { + /* We have already allocated space in the .got. */ + break; + } + h->got.offset = sgot->_raw_size; + + /* Make sure this symbol is output as a dynamic symbol. */ + if (h->dynindx == -1) + { + if (! bfd_elf32_link_record_dynamic_symbol (info, h)) + return false; + } + + srelgot->_raw_size += sizeof (Elf32_External_Rela); + } + else + { + /* This is a global offset table entry for a local + symbol. */ + if (local_got_offsets == NULL) + { + size_t size; + register unsigned int i; + + size = symtab_hdr->sh_info * sizeof (bfd_vma); + local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size); + if (local_got_offsets == NULL) + return false; + elf_local_got_offsets (abfd) = local_got_offsets; + for (i = 0; i < symtab_hdr->sh_info; i++) + local_got_offsets[i] = (bfd_vma) -1; + } + if (local_got_offsets[r_symndx] != (bfd_vma) -1) + { + /* We have already allocated space in the .got. */ + break; + } + local_got_offsets[r_symndx] = sgot->_raw_size; + + if (info->shared) + { + /* If we are generating a shared object, we need to + output a R_SH_RELATIVE reloc so that the dynamic + linker can adjust this GOT entry. */ + srelgot->_raw_size += sizeof (Elf32_External_Rela); + } + } + + sgot->_raw_size += 4; + + break; + + case R_SH_PLT32: + /* This symbol requires a procedure linkage table entry. We + actually build the entry in adjust_dynamic_symbol, + because this might be a case of linking PIC code which is + never referenced by a dynamic object, in which case we + don't need to generate a procedure linkage table entry + after all. */ + + /* If this is a local symbol, we resolve it directly without + creating a procedure linkage table entry. */ + if (h == NULL) + continue; + + if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL + || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN) + break; + + h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; + + break; + + case R_SH_DIR32: + case R_SH_REL32: + if (h != NULL) + h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; + + /* If we are creating a shared library, and this is a reloc + against a global symbol, or a non PC relative reloc + against a local symbol, then we need to copy the reloc + into the shared library. However, if we are linking with + -Bsymbolic, we do not need to copy a reloc against a + global symbol which is defined in an object we are + including in the link (i.e., DEF_REGULAR is set). At + this point we have not seen all the input files, so it is + possible that DEF_REGULAR is not set now but will be set + later (it is never cleared). We account for that + possibility below by storing information in the + pcrel_relocs_copied field of the hash table entry. */ + if (info->shared + && (sec->flags & SEC_ALLOC) != 0 + && (ELF32_R_TYPE (rel->r_info) != R_SH_REL32 + || (h != NULL + && (! info->symbolic + || (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0)))) + { + /* When creating a shared object, we must copy these + reloc types into the output file. We create a reloc + section in dynobj and make room for this reloc. */ + if (sreloc == NULL) + { + const char *name; + + name = (bfd_elf_string_from_elf_section + (abfd, + elf_elfheader (abfd)->e_shstrndx, + elf_section_data (sec)->rel_hdr.sh_name)); + if (name == NULL) + return false; + + BFD_ASSERT (strncmp (name, ".rela", 5) == 0 + && strcmp (bfd_get_section_name (abfd, sec), + name + 5) == 0); + + sreloc = bfd_get_section_by_name (dynobj, name); + if (sreloc == NULL) + { + flagword flags; + + sreloc = bfd_make_section (dynobj, name); + flags = (SEC_HAS_CONTENTS | SEC_READONLY + | SEC_IN_MEMORY | SEC_LINKER_CREATED); + if ((sec->flags & SEC_ALLOC) != 0) + flags |= SEC_ALLOC | SEC_LOAD; + if (sreloc == NULL + || ! bfd_set_section_flags (dynobj, sreloc, flags) + || ! bfd_set_section_alignment (dynobj, sreloc, 2)) + return false; + } + } + + sreloc->_raw_size += sizeof (Elf32_External_Rela); + + /* If we are linking with -Bsymbolic, and this is a + global symbol, we count the number of PC relative + relocations we have entered for this symbol, so that + we can discard them again if the symbol is later + defined by a regular object. Note that this function + is only called if we are using an elf_sh linker + hash table, which means that h is really a pointer to + an elf_sh_link_hash_entry. */ + if (h != NULL && info->symbolic + && ELF32_R_TYPE (rel->r_info) == R_SH_REL32) + { + struct elf_sh_link_hash_entry *eh; + struct elf_sh_pcrel_relocs_copied *p; + + eh = (struct elf_sh_link_hash_entry *) h; + + for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) + if (p->section == sreloc) + break; + + if (p == NULL) + { + p = ((struct elf_sh_pcrel_relocs_copied *) + bfd_alloc (dynobj, sizeof *p)); + if (p == NULL) + return false; + p->next = eh->pcrel_relocs_copied; + eh->pcrel_relocs_copied = p; + p->section = sreloc; + p->count = 0; + } + + ++p->count; + } + } + + break; } } @@ -2366,6 +3823,337 @@ sh_elf_merge_private_data (ibfd, obfd) return sh_elf_set_mach_from_flags (obfd); } +/* Finish up dynamic symbol handling. We set the contents of various + dynamic sections here. */ + +static boolean +sh_elf_finish_dynamic_symbol (output_bfd, info, h, sym) + bfd *output_bfd; + struct bfd_link_info *info; + struct elf_link_hash_entry *h; + Elf_Internal_Sym *sym; +{ + bfd *dynobj; + + dynobj = elf_hash_table (info)->dynobj; + + if (h->plt.offset != (bfd_vma) -1) + { + asection *splt; + asection *sgot; + asection *srel; + + bfd_vma plt_index; + bfd_vma got_offset; + Elf_Internal_Rela rel; + + /* This symbol has an entry in the procedure linkage table. Set + it up. */ + + BFD_ASSERT (h->dynindx != -1); + + splt = bfd_get_section_by_name (dynobj, ".plt"); + sgot = bfd_get_section_by_name (dynobj, ".got.plt"); + srel = bfd_get_section_by_name (dynobj, ".rela.plt"); + BFD_ASSERT (splt != NULL && sgot != NULL && srel != NULL); + + /* Get the index in the procedure linkage table which + corresponds to this symbol. This is the index of this symbol + in all the symbols for which we are making plt entries. The + first entry in the procedure linkage table is reserved. */ + plt_index = h->plt.offset / elf_sh_sizeof_plt (info) - 1; + + /* Get the offset into the .got table of the entry that + corresponds to this function. Each .got entry is 4 bytes. + The first three are reserved. */ + got_offset = (plt_index + 3) * 4; + + /* Fill in the entry in the procedure linkage table. */ + if (! info->shared) + { + if (elf_sh_plt_entry == NULL) + { + elf_sh_plt_entry = (bfd_big_endian (output_bfd)? + elf_sh_plt_entry_be : elf_sh_plt_entry_le); + } + memcpy (splt->contents + h->plt.offset, elf_sh_plt_entry, + elf_sh_sizeof_plt (info)); + bfd_put_32 (output_bfd, + (sgot->output_section->vma + + sgot->output_offset + + got_offset), + (splt->contents + h->plt.offset + + elf_sh_plt_symbol_offset (info))); + + bfd_put_32 (output_bfd, + (splt->output_section->vma + splt->output_offset), + (splt->contents + h->plt.offset + + elf_sh_plt_plt0_offset (info))); + } + else + { + if (elf_sh_pic_plt_entry == NULL) + { + elf_sh_pic_plt_entry = (bfd_big_endian (output_bfd)? + elf_sh_pic_plt_entry_be : + elf_sh_pic_plt_entry_le); + } + memcpy (splt->contents + h->plt.offset, elf_sh_pic_plt_entry, + elf_sh_sizeof_plt (info)); + bfd_put_32 (output_bfd, got_offset, + (splt->contents + h->plt.offset + + elf_sh_plt_symbol_offset (info))); + } + + bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), + (splt->contents + h->plt.offset + + elf_sh_plt_reloc_offset (info))); + + /* Fill in the entry in the global offset table. */ + bfd_put_32 (output_bfd, + (splt->output_section->vma + + splt->output_offset + + h->plt.offset + + elf_sh_plt_temp_offset (info)), + sgot->contents + got_offset); + + /* Fill in the entry in the .rela.plt section. */ + rel.r_offset = (sgot->output_section->vma + + sgot->output_offset + + got_offset); + rel.r_info = ELF32_R_INFO (h->dynindx, R_SH_JMP_SLOT); + rel.r_addend = 0; + bfd_elf32_swap_reloca_out (output_bfd, &rel, + ((Elf32_External_Rela *) srel->contents + + plt_index)); + + if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) + { + /* Mark the symbol as undefined, rather than as defined in + the .plt section. Leave the value alone. */ + sym->st_shndx = SHN_UNDEF; + } + } + + if (h->got.offset != (bfd_vma) -1) + { + asection *sgot; + asection *srel; + Elf_Internal_Rela rel; + + /* This symbol has an entry in the global offset table. Set it + up. */ + + sgot = bfd_get_section_by_name (dynobj, ".got"); + srel = bfd_get_section_by_name (dynobj, ".rela.got"); + BFD_ASSERT (sgot != NULL && srel != NULL); + + rel.r_offset = (sgot->output_section->vma + + sgot->output_offset + + (h->got.offset &~ 1)); + + /* If this is a -Bsymbolic link, and the symbol is defined + locally, we just want to emit a RELATIVE reloc. Likewise if + the symbol was forced to be local because of a version file. + The entry in the global offset table will already have been + initialized in the relocate_section function. */ + if (info->shared + && (info->symbolic || h->dynindx == -1) + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) + { + rel.r_info = ELF32_R_INFO (0, R_SH_RELATIVE); + rel.r_addend = (h->root.u.def.value + + h->root.u.def.section->output_section->vma + + h->root.u.def.section->output_offset); + } + else + { + bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); + rel.r_info = ELF32_R_INFO (h->dynindx, R_SH_GLOB_DAT); + rel.r_addend = 0; + } + + bfd_elf32_swap_reloca_out (output_bfd, &rel, + ((Elf32_External_Rela *) srel->contents + + srel->reloc_count)); + ++srel->reloc_count; + } + + if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) + { + asection *s; + Elf_Internal_Rela rel; + + /* This symbol needs a copy reloc. Set it up. */ + + BFD_ASSERT (h->dynindx != -1 + && (h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak)); + + s = bfd_get_section_by_name (h->root.u.def.section->owner, + ".rela.bss"); + BFD_ASSERT (s != NULL); + + rel.r_offset = (h->root.u.def.value + + h->root.u.def.section->output_section->vma + + h->root.u.def.section->output_offset); + rel.r_info = ELF32_R_INFO (h->dynindx, R_SH_COPY); + rel.r_addend = 0; + bfd_elf32_swap_reloca_out (output_bfd, &rel, + ((Elf32_External_Rela *) s->contents + + s->reloc_count)); + ++s->reloc_count; + } + + /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ + if (strcmp (h->root.root.string, "_DYNAMIC") == 0 + || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) + sym->st_shndx = SHN_ABS; + + return true; +} + +/* Finish up the dynamic sections. */ + +static boolean +sh_elf_finish_dynamic_sections (output_bfd, info) + bfd *output_bfd; + struct bfd_link_info *info; +{ + bfd *dynobj; + asection *sgot; + asection *sdyn; + + dynobj = elf_hash_table (info)->dynobj; + + sgot = bfd_get_section_by_name (dynobj, ".got.plt"); + BFD_ASSERT (sgot != NULL); + sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); + + if (elf_hash_table (info)->dynamic_sections_created) + { + asection *splt; + Elf32_External_Dyn *dyncon, *dynconend; + + BFD_ASSERT (sdyn != NULL); + + dyncon = (Elf32_External_Dyn *) sdyn->contents; + dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); + for (; dyncon < dynconend; dyncon++) + { + Elf_Internal_Dyn dyn; + const char *name; + asection *s; + + bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); + + switch (dyn.d_tag) + { + default: + break; + + case DT_PLTGOT: + name = ".got"; + goto get_vma; + + case DT_JMPREL: + name = ".rela.plt"; + get_vma: + s = bfd_get_section_by_name (output_bfd, name); + BFD_ASSERT (s != NULL); + dyn.d_un.d_ptr = s->vma; + bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); + break; + + case DT_PLTRELSZ: + s = bfd_get_section_by_name (output_bfd, ".rela.plt"); + BFD_ASSERT (s != NULL); + if (s->_cooked_size != 0) + dyn.d_un.d_val = s->_cooked_size; + else + dyn.d_un.d_val = s->_raw_size; + bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); + break; + + case DT_RELASZ: + /* My reading of the SVR4 ABI indicates that the + procedure linkage table relocs (DT_JMPREL) should be + included in the overall relocs (DT_RELA). This is + what Solaris does. However, UnixWare can not handle + that case. Therefore, we override the DT_RELASZ entry + here to make it not include the JMPREL relocs. Since + the linker script arranges for .rela.plt to follow all + other relocation sections, we don't have to worry + about changing the DT_RELA entry. */ + s = bfd_get_section_by_name (output_bfd, ".rela.plt"); + if (s != NULL) + { + if (s->_cooked_size != 0) + dyn.d_un.d_val -= s->_cooked_size; + else + dyn.d_un.d_val -= s->_raw_size; + } + bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); + break; + } + } + + /* Fill in the first entry in the procedure linkage table. */ + splt = bfd_get_section_by_name (dynobj, ".plt"); + if (splt && splt->_raw_size > 0) + { + if (info->shared) + { + if (elf_sh_pic_plt_entry == NULL) + { + elf_sh_pic_plt_entry = (bfd_big_endian (output_bfd)? + elf_sh_pic_plt_entry_be : + elf_sh_pic_plt_entry_le); + } + memcpy (splt->contents, elf_sh_pic_plt_entry, + elf_sh_sizeof_plt (info)); + } + else + { + if (elf_sh_plt0_entry == NULL) + { + elf_sh_plt0_entry = (bfd_big_endian (output_bfd)? + elf_sh_plt0_entry_be : + elf_sh_plt0_entry_le); + } + memcpy (splt->contents, elf_sh_plt0_entry, PLT_ENTRY_SIZE); + bfd_put_32 (output_bfd, + sgot->output_section->vma + sgot->output_offset + 4, + splt->contents + elf_sh_plt0_gotid_offset (info)); + bfd_put_32 (output_bfd, + sgot->output_section->vma + sgot->output_offset + 8, + splt->contents + elf_sh_plt0_linker_offset (info)); + } + + /* UnixWare sets the entsize of .plt to 4, although that doesn't + really seem like the right value. */ + elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; + } + } + + /* Fill in the first three entries in the global offset table. */ + if (sgot->_raw_size > 0) + { + if (sdyn == NULL) + bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); + else + bfd_put_32 (output_bfd, + sdyn->output_section->vma + sdyn->output_offset, + sgot->contents); + bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); + bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); + } + + elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; + + return true; +} + #define TARGET_BIG_SYM bfd_elf32_sh_vec #define TARGET_BIG_NAME "elf32-sh" #define TARGET_LITTLE_SYM bfd_elf32_shl_vec @@ -2394,5 +4182,23 @@ sh_elf_merge_private_data (ibfd, obfd) #define elf_backend_gc_sweep_hook sh_elf_gc_sweep_hook #define elf_backend_check_relocs sh_elf_check_relocs -#define elf_backend_can_gc_sections 1 +#define elf_backend_can_gc_sections 1 +#define elf_backend_create_dynamic_sections \ + sh_elf_create_dynamic_sections +#define bfd_elf32_bfd_link_hash_table_create \ + sh_elf_link_hash_table_create +#define elf_backend_adjust_dynamic_symbol \ + sh_elf_adjust_dynamic_symbol +#define elf_backend_size_dynamic_sections \ + sh_elf_size_dynamic_sections +#define elf_backend_finish_dynamic_symbol \ + sh_elf_finish_dynamic_symbol +#define elf_backend_finish_dynamic_sections \ + sh_elf_finish_dynamic_sections + +#define elf_backend_want_got_plt 1 +#define elf_backend_plt_readonly 1 +#define elf_backend_want_plt_sym 0 +#define elf_backend_got_header_size 12 +#define elf_backend_plt_header_size PLT_ENTRY_SIZE #include "elf32-target.h" |