#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/bfin.h"
+#include "elf/dwarf2.h"
+#include "hashtab.h"
/* FUNCTION : bfin_pltpc_reloc
ABSTRACT : TODO : figure out how to handle pltpc relocs. */
the relocation stack. . */
#define BFIN_RELOC_MIN 0
-#define BFIN_RELOC_MAX 0x13
+#define BFIN_RELOC_MAX 0x21
#define BFIN_GNUEXT_RELOC_MIN 0x40
#define BFIN_GNUEXT_RELOC_MAX 0x43
#define BFIN_ARELOC_MIN 0xE0
0, /* src_mask. */
0x000003FF, /* dst_mask. */
FALSE), /* pcrel_offset. */
+
+
+ /* A 18-bit signed operand with the GOT offset for the address of
+ the symbol. */
+ HOWTO (R_BFIN_GOT17M4, /* type */
+ 2, /* rightshift */
+ 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 16, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_signed, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_BFIN_GOT12", /* name */
+ FALSE, /* partial_inplace */
+ 0xffff, /* src_mask */
+ 0xffff, /* dst_mask */
+ FALSE), /* pcrel_offset */
+
+ /* The upper 16 bits of the GOT offset for the address of the
+ symbol. */
+ HOWTO (R_BFIN_GOTHI, /* type */
+ 0, /* rightshift */
+ 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 16, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_dont, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_BFIN_GOTHI", /* name */
+ FALSE, /* partial_inplace */
+ 0xffff, /* src_mask */
+ 0xffff, /* dst_mask */
+ FALSE), /* pcrel_offset */
+
+ /* The lower 16 bits of the GOT offset for the address of the
+ symbol. */
+ HOWTO (R_BFIN_GOTLO, /* type */
+ 0, /* rightshift */
+ 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 16, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_dont, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_BFIN_GOTLO", /* name */
+ FALSE, /* partial_inplace */
+ 0xffff, /* src_mask */
+ 0xffff, /* dst_mask */
+ FALSE), /* pcrel_offset */
+
+ /* The 32-bit address of the canonical descriptor of a function. */
+ HOWTO (R_BFIN_FUNCDESC, /* 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, /* special_function */
+ "R_BFIN_FUNCDESC", /* name */
+ FALSE, /* partial_inplace */
+ 0xffffffff, /* src_mask */
+ 0xffffffff, /* dst_mask */
+ FALSE), /* pcrel_offset */
+
+ /* A 12-bit signed operand with the GOT offset for the address of
+ canonical descriptor of a function. */
+ HOWTO (R_BFIN_FUNCDESC_GOT17M4, /* type */
+ 2, /* rightshift */
+ 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 16, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_signed, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_BFIN_FUNCDESC_GOT17M4", /* name */
+ FALSE, /* partial_inplace */
+ 0xffff, /* src_mask */
+ 0xffff, /* dst_mask */
+ FALSE), /* pcrel_offset */
+
+ /* The upper 16 bits of the GOT offset for the address of the
+ canonical descriptor of a function. */
+ HOWTO (R_BFIN_FUNCDESC_GOTHI, /* type */
+ 0, /* rightshift */
+ 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 16, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_dont, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_BFIN_FUNCDESC_GOTHI", /* name */
+ FALSE, /* partial_inplace */
+ 0xffff, /* src_mask */
+ 0xffff, /* dst_mask */
+ FALSE), /* pcrel_offset */
+
+ /* The lower 16 bits of the GOT offset for the address of the
+ canonical descriptor of a function. */
+ HOWTO (R_BFIN_FUNCDESC_GOTLO, /* type */
+ 0, /* rightshift */
+ 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 16, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_dont, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_BFIN_FUNCDESC_GOTLO", /* name */
+ FALSE, /* partial_inplace */
+ 0xffff, /* src_mask */
+ 0xffff, /* dst_mask */
+ FALSE), /* pcrel_offset */
+
+ /* The 32-bit address of the canonical descriptor of a function. */
+ HOWTO (R_BFIN_FUNCDESC_VALUE, /* type */
+ 0, /* rightshift */
+ 2, /* size (0 = byte, 1 = short, 2 = long) */
+ 64, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_bitfield, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_BFIN_FUNCDESC_VALUE", /* name */
+ FALSE, /* partial_inplace */
+ 0xffffffff, /* src_mask */
+ 0xffffffff, /* dst_mask */
+ FALSE), /* pcrel_offset */
+
+ /* A 12-bit signed operand with the GOT offset for the address of
+ canonical descriptor of a function. */
+ HOWTO (R_BFIN_FUNCDESC_GOTOFF17M4, /* type */
+ 2, /* rightshift */
+ 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 16, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_signed, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_BFIN_FUNCDESC_GOTOFF17M4", /* name */
+ FALSE, /* partial_inplace */
+ 0xffff, /* src_mask */
+ 0xffff, /* dst_mask */
+ FALSE), /* pcrel_offset */
+
+ /* The upper 16 bits of the GOT offset for the address of the
+ canonical descriptor of a function. */
+ HOWTO (R_BFIN_FUNCDESC_GOTOFFHI, /* type */
+ 0, /* rightshift */
+ 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 16, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_dont, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_BFIN_FUNCDESC_GOTOFFHI", /* name */
+ FALSE, /* partial_inplace */
+ 0xffff, /* src_mask */
+ 0xffff, /* dst_mask */
+ FALSE), /* pcrel_offset */
+
+ /* The lower 16 bits of the GOT offset for the address of the
+ canonical descriptor of a function. */
+ HOWTO (R_BFIN_FUNCDESC_GOTOFFLO, /* type */
+ 0, /* rightshift */
+ 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 16, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_dont, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_BFIN_FUNCDESC_GOTOFFLO", /* name */
+ FALSE, /* partial_inplace */
+ 0xffff, /* src_mask */
+ 0xffff, /* dst_mask */
+ FALSE), /* pcrel_offset */
+
+ /* A 12-bit signed operand with the GOT offset for the address of
+ the symbol. */
+ HOWTO (R_BFIN_GOTOFF17M4, /* type */
+ 2, /* rightshift */
+ 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 16, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_signed, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_BFIN_GOTOFF17M4", /* name */
+ FALSE, /* partial_inplace */
+ 0xffff, /* src_mask */
+ 0xffff, /* dst_mask */
+ FALSE), /* pcrel_offset */
+
+ /* The upper 16 bits of the GOT offset for the address of the
+ symbol. */
+ HOWTO (R_BFIN_GOTOFFHI, /* type */
+ 0, /* rightshift */
+ 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 16, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_dont, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_BFIN_GOTOFFHI", /* name */
+ FALSE, /* partial_inplace */
+ 0xffff, /* src_mask */
+ 0xffff, /* dst_mask */
+ FALSE), /* pcrel_offset */
+
+ /* The lower 16 bits of the GOT offset for the address of the
+ symbol. */
+ HOWTO (R_BFIN_GOTOFFLO, /* type */
+ 0, /* rightshift */
+ 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 16, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_dont, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_BFIN_GOTOFFLO", /* name */
+ FALSE, /* partial_inplace */
+ 0xffff, /* src_mask */
+ 0xffff, /* dst_mask */
+ FALSE), /* pcrel_offset */
};
static reloc_howto_type bfin_gnuext_howto_table [] =
{ BFD_RELOC_BFIN_11_PCREL, R_pcrel11 },
{ BFD_RELOC_BFIN_GOT, R_got },
{ BFD_RELOC_BFIN_PLTPC, R_pltpc },
+
+ { BFD_RELOC_BFIN_GOT17M4, R_BFIN_GOT17M4 },
+ { BFD_RELOC_BFIN_GOTHI, R_BFIN_GOTHI },
+ { BFD_RELOC_BFIN_GOTLO, R_BFIN_GOTLO },
+ { BFD_RELOC_BFIN_FUNCDESC, R_BFIN_FUNCDESC },
+ { BFD_RELOC_BFIN_FUNCDESC_GOT17M4, R_BFIN_FUNCDESC_GOT17M4 },
+ { BFD_RELOC_BFIN_FUNCDESC_GOTHI, R_BFIN_FUNCDESC_GOTHI },
+ { BFD_RELOC_BFIN_FUNCDESC_GOTLO, R_BFIN_FUNCDESC_GOTLO },
+ { BFD_RELOC_BFIN_FUNCDESC_VALUE, R_BFIN_FUNCDESC_VALUE },
+ { BFD_RELOC_BFIN_FUNCDESC_GOTOFF17M4, R_BFIN_FUNCDESC_GOTOFF17M4 },
+ { BFD_RELOC_BFIN_FUNCDESC_GOTOFFHI, R_BFIN_FUNCDESC_GOTOFFHI },
+ { BFD_RELOC_BFIN_FUNCDESC_GOTOFFLO, R_BFIN_FUNCDESC_GOTOFFLO },
+ { BFD_RELOC_BFIN_GOTOFF17M4, R_BFIN_GOTOFF17M4 },
+ { BFD_RELOC_BFIN_GOTOFFHI, R_BFIN_GOTOFFHI },
+ { BFD_RELOC_BFIN_GOTOFFLO, R_BFIN_GOTOFFLO },
+
{ BFD_RELOC_VTABLE_INHERIT, R_BFIN_GNU_VTINHERIT },
{ BFD_RELOC_VTABLE_ENTRY, R_BFIN_GNU_VTENTRY },
};
return _bfd_elf_is_local_label_name (abfd, label);
}
+extern const bfd_target bfd_elf32_bfinfdpic_vec;
+#define IS_FDPIC(bfd) ((bfd)->xvec == &bfd_elf32_bfinfdpic_vec)
+
+/* An extension of the elf hash table data structure, containing some
+ additional Blackfin-specific data. */
+struct bfinfdpic_elf_link_hash_table
+{
+ struct elf_link_hash_table elf;
+
+ /* A pointer to the .got section. */
+ asection *sgot;
+ /* A pointer to the .rel.got section. */
+ asection *sgotrel;
+ /* A pointer to the .rofixup section. */
+ asection *sgotfixup;
+ /* A pointer to the .plt section. */
+ asection *splt;
+ /* A pointer to the .rel.plt section. */
+ asection *spltrel;
+ /* GOT base offset. */
+ bfd_vma got0;
+ /* Location of the first non-lazy PLT entry, i.e., the number of
+ bytes taken by lazy PLT entries. */
+ bfd_vma plt0;
+ /* A hash table holding information about which symbols were
+ referenced with which PIC-related relocations. */
+ struct htab *relocs_info;
+};
+
+/* Get the Blackfin ELF linker hash table from a link_info structure. */
+
+#define bfinfdpic_hash_table(info) \
+ ((struct bfinfdpic_elf_link_hash_table *) ((info)->hash))
+
+#define bfinfdpic_got_section(info) \
+ (bfinfdpic_hash_table (info)->sgot)
+#define bfinfdpic_gotrel_section(info) \
+ (bfinfdpic_hash_table (info)->sgotrel)
+#define bfinfdpic_gotfixup_section(info) \
+ (bfinfdpic_hash_table (info)->sgotfixup)
+#define bfinfdpic_plt_section(info) \
+ (bfinfdpic_hash_table (info)->splt)
+#define bfinfdpic_pltrel_section(info) \
+ (bfinfdpic_hash_table (info)->spltrel)
+#define bfinfdpic_relocs_info(info) \
+ (bfinfdpic_hash_table (info)->relocs_info)
+#define bfinfdpic_got_initial_offset(info) \
+ (bfinfdpic_hash_table (info)->got0)
+#define bfinfdpic_plt_initial_offset(info) \
+ (bfinfdpic_hash_table (info)->plt0)
+
+/* Create a Blackfin ELF linker hash table. */
+
+static struct bfd_link_hash_table *
+bfinfdpic_elf_link_hash_table_create (bfd *abfd)
+{
+ struct bfinfdpic_elf_link_hash_table *ret;
+ bfd_size_type amt = sizeof (struct bfinfdpic_elf_link_hash_table);
+
+ ret = bfd_zalloc (abfd, amt);
+ if (ret == NULL)
+ return NULL;
+
+ if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
+ _bfd_elf_link_hash_newfunc,
+ sizeof (struct elf_link_hash_entry)))
+ {
+ free (ret);
+ return NULL;
+ }
+
+ return &ret->elf.root;
+}
+
+/* Decide whether a reference to a symbol can be resolved locally or
+ not. If the symbol is protected, we want the local address, but
+ its function descriptor must be assigned by the dynamic linker. */
+#define BFINFDPIC_SYM_LOCAL(INFO, H) \
+ (_bfd_elf_symbol_refs_local_p ((H), (INFO), 1) \
+ || ! elf_hash_table (INFO)->dynamic_sections_created)
+#define BFINFDPIC_FUNCDESC_LOCAL(INFO, H) \
+ ((H)->dynindx == -1 || ! elf_hash_table (INFO)->dynamic_sections_created)
+
+/* This structure collects information on what kind of GOT, PLT or
+ function descriptors are required by relocations that reference a
+ certain symbol. */
+struct bfinfdpic_relocs_info
+{
+ /* The index of the symbol, as stored in the relocation r_info, if
+ we have a local symbol; -1 otherwise. */
+ long symndx;
+ union
+ {
+ /* The input bfd in which the symbol is defined, if it's a local
+ symbol. */
+ bfd *abfd;
+ /* If symndx == -1, the hash table entry corresponding to a global
+ symbol (even if it turns out to bind locally, in which case it
+ should ideally be replaced with section's symndx + addend). */
+ struct elf_link_hash_entry *h;
+ } d;
+ /* The addend of the relocation that references the symbol. */
+ bfd_vma addend;
+
+ /* The fields above are used to identify an entry. The fields below
+ contain information on how an entry is used and, later on, which
+ locations it was assigned. */
+ /* The following 2 fields record whether the symbol+addend above was
+ ever referenced with a GOT relocation. The 17M4 suffix indicates a
+ GOT17M4 relocation; hilo is used for GOTLO/GOTHI pairs. */
+ unsigned got17m4:1;
+ unsigned gothilo:1;
+ /* Whether a FUNCDESC relocation references symbol+addend. */
+ unsigned fd:1;
+ /* Whether a FUNCDESC_GOT relocation references symbol+addend. */
+ unsigned fdgot17m4:1;
+ unsigned fdgothilo:1;
+ /* Whether a FUNCDESC_GOTOFF relocation references symbol+addend. */
+ unsigned fdgoff17m4:1;
+ unsigned fdgoffhilo:1;
+ /* Whether symbol+addend is referenced with GOTOFF17M4, GOTOFFLO or
+ GOTOFFHI relocations. The addend doesn't really matter, since we
+ envision that this will only be used to check whether the symbol
+ is mapped to the same segment as the got. */
+ unsigned gotoff:1;
+ /* Whether symbol+addend is referenced by a LABEL24 relocation. */
+ unsigned call:1;
+ /* Whether symbol+addend is referenced by a 32 or FUNCDESC_VALUE
+ relocation. */
+ unsigned sym:1;
+ /* Whether we need a PLT entry for a symbol. Should be implied by
+ something like:
+ (call && symndx == -1 && ! BFINFDPIC_SYM_LOCAL (info, d.h)) */
+ unsigned plt:1;
+ /* Whether a function descriptor should be created in this link unit
+ for symbol+addend. Should be implied by something like:
+ (plt || fdgotoff17m4 || fdgotofflohi
+ || ((fd || fdgot17m4 || fdgothilo)
+ && (symndx != -1 || BFINFDPIC_FUNCDESC_LOCAL (info, d.h)))) */
+ unsigned privfd:1;
+ /* Whether a lazy PLT entry is needed for this symbol+addend.
+ Should be implied by something like:
+ (privfd && symndx == -1 && ! BFINFDPIC_SYM_LOCAL (info, d.h)
+ && ! (info->flags & DF_BIND_NOW)) */
+ unsigned lazyplt:1;
+ /* Whether we've already emitted GOT relocations and PLT entries as
+ needed for this symbol. */
+ unsigned done:1;
+
+ /* The number of R_byte4_data, R_BFIN_FUNCDESC and R_BFIN_FUNCDESC_VALUE
+ relocations referencing the symbol. */
+ unsigned relocs32, relocsfd, relocsfdv;
+
+ /* The number of .rofixups entries and dynamic relocations allocated
+ for this symbol, minus any that might have already been used. */
+ unsigned fixups, dynrelocs;
+
+ /* The offsets of the GOT entries assigned to symbol+addend, to the
+ function descriptor's address, and to a function descriptor,
+ respectively. Should be zero if unassigned. The offsets are
+ counted from the value that will be assigned to the PIC register,
+ not from the beginning of the .got section. */
+ bfd_signed_vma got_entry, fdgot_entry, fd_entry;
+ /* The offsets of the PLT entries assigned to symbol+addend,
+ non-lazy and lazy, respectively. If unassigned, should be
+ (bfd_vma)-1. */
+ bfd_vma plt_entry, lzplt_entry;
+};
+
+/* Compute a hash with the key fields of an bfinfdpic_relocs_info entry. */
+static hashval_t
+bfinfdpic_relocs_info_hash (const void *entry_)
+{
+ const struct bfinfdpic_relocs_info *entry = entry_;
+
+ return (entry->symndx == -1
+ ? entry->d.h->root.root.hash
+ : entry->symndx + entry->d.abfd->id * 257) + entry->addend;
+}
+
+/* Test whether the key fields of two bfinfdpic_relocs_info entries are
+ identical. */
+static int
+bfinfdpic_relocs_info_eq (const void *entry1, const void *entry2)
+{
+ const struct bfinfdpic_relocs_info *e1 = entry1;
+ const struct bfinfdpic_relocs_info *e2 = entry2;
+
+ return e1->symndx == e2->symndx && e1->addend == e2->addend
+ && (e1->symndx == -1 ? e1->d.h == e2->d.h : e1->d.abfd == e2->d.abfd);
+}
+
+/* Find or create an entry in a hash table HT that matches the key
+ fields of the given ENTRY. If it's not found, memory for a new
+ entry is allocated in ABFD's obstack. */
+static struct bfinfdpic_relocs_info *
+bfinfdpic_relocs_info_find (struct htab *ht,
+ bfd *abfd,
+ const struct bfinfdpic_relocs_info *entry,
+ enum insert_option insert)
+{
+ struct bfinfdpic_relocs_info **loc =
+ (struct bfinfdpic_relocs_info **) htab_find_slot (ht, entry, insert);
+
+ if (! loc)
+ return NULL;
+
+ if (*loc)
+ return *loc;
+
+ *loc = bfd_zalloc (abfd, sizeof (**loc));
+
+ if (! *loc)
+ return *loc;
+
+ (*loc)->symndx = entry->symndx;
+ (*loc)->d = entry->d;
+ (*loc)->addend = entry->addend;
+ (*loc)->plt_entry = (bfd_vma)-1;
+ (*loc)->lzplt_entry = (bfd_vma)-1;
+
+ return *loc;
+}
+
+/* Obtain the address of the entry in HT associated with H's symbol +
+ addend, creating a new entry if none existed. ABFD is only used
+ for memory allocation purposes. */
+inline static struct bfinfdpic_relocs_info *
+bfinfdpic_relocs_info_for_global (struct htab *ht,
+ bfd *abfd,
+ struct elf_link_hash_entry *h,
+ bfd_vma addend,
+ enum insert_option insert)
+{
+ struct bfinfdpic_relocs_info entry;
+
+ entry.symndx = -1;
+ entry.d.h = h;
+ entry.addend = addend;
+
+ return bfinfdpic_relocs_info_find (ht, abfd, &entry, insert);
+}
+
+/* Obtain the address of the entry in HT associated with the SYMNDXth
+ local symbol of the input bfd ABFD, plus the addend, creating a new
+ entry if none existed. */
+inline static struct bfinfdpic_relocs_info *
+bfinfdpic_relocs_info_for_local (struct htab *ht,
+ bfd *abfd,
+ long symndx,
+ bfd_vma addend,
+ enum insert_option insert)
+{
+ struct bfinfdpic_relocs_info entry;
+
+ entry.symndx = symndx;
+ entry.d.abfd = abfd;
+ entry.addend = addend;
+
+ return bfinfdpic_relocs_info_find (ht, abfd, &entry, insert);
+}
+
+/* Merge fields set by check_relocs() of two entries that end up being
+ mapped to the same (presumably global) symbol. */
+
+inline static void
+bfinfdpic_pic_merge_early_relocs_info (struct bfinfdpic_relocs_info *e2,
+ struct bfinfdpic_relocs_info const *e1)
+{
+ e2->got17m4 |= e1->got17m4;
+ e2->gothilo |= e1->gothilo;
+ e2->fd |= e1->fd;
+ e2->fdgot17m4 |= e1->fdgot17m4;
+ e2->fdgothilo |= e1->fdgothilo;
+ e2->fdgoff17m4 |= e1->fdgoff17m4;
+ e2->fdgoffhilo |= e1->fdgoffhilo;
+ e2->gotoff |= e1->gotoff;
+ e2->call |= e1->call;
+ e2->sym |= e1->sym;
+}
+
+/* Every block of 65535 lazy PLT entries shares a single call to the
+ resolver, inserted in the 32768th lazy PLT entry (i.e., entry #
+ 32767, counting from 0). All other lazy PLT entries branch to it
+ in a single instruction. */
+
+#define LZPLT_RESOLVER_EXTRA 10
+#define LZPLT_NORMAL_SIZE 6
+#define LZPLT_ENTRIES 1362
+
+#define BFINFDPIC_LZPLT_BLOCK_SIZE ((bfd_vma) LZPLT_NORMAL_SIZE * LZPLT_ENTRIES + LZPLT_RESOLVER_EXTRA)
+#define BFINFDPIC_LZPLT_RESOLV_LOC (LZPLT_NORMAL_SIZE * LZPLT_ENTRIES / 2)
+
+/* Add a dynamic relocation to the SRELOC section. */
+
+inline static bfd_vma
+_bfinfdpic_add_dyn_reloc (bfd *output_bfd, asection *sreloc, bfd_vma offset,
+ int reloc_type, long dynindx, bfd_vma addend,
+ struct bfinfdpic_relocs_info *entry)
+{
+ Elf_Internal_Rela outrel;
+ bfd_vma reloc_offset;
+
+ outrel.r_offset = offset;
+ outrel.r_info = ELF32_R_INFO (dynindx, reloc_type);
+ outrel.r_addend = addend;
+
+ reloc_offset = sreloc->reloc_count * sizeof (Elf32_External_Rel);
+ BFD_ASSERT (reloc_offset < sreloc->size);
+ bfd_elf32_swap_reloc_out (output_bfd, &outrel,
+ sreloc->contents + reloc_offset);
+ sreloc->reloc_count++;
+
+ /* If the entry's index is zero, this relocation was probably to a
+ linkonce section that got discarded. We reserved a dynamic
+ relocation, but it was for another entry than the one we got at
+ the time of emitting the relocation. Unfortunately there's no
+ simple way for us to catch this situation, since the relocation
+ is cleared right before calling relocate_section, at which point
+ we no longer know what the relocation used to point to. */
+ if (entry->symndx)
+ {
+ BFD_ASSERT (entry->dynrelocs > 0);
+ entry->dynrelocs--;
+ }
+
+ return reloc_offset;
+}
+
+/* Add a fixup to the ROFIXUP section. */
+
+static bfd_vma
+_bfinfdpic_add_rofixup (bfd *output_bfd, asection *rofixup, bfd_vma offset,
+ struct bfinfdpic_relocs_info *entry)
+{
+ bfd_vma fixup_offset;
+
+ if (rofixup->flags & SEC_EXCLUDE)
+ return -1;
+
+ fixup_offset = rofixup->reloc_count * 4;
+ if (rofixup->contents)
+ {
+ BFD_ASSERT (fixup_offset < rofixup->size);
+ bfd_put_32 (output_bfd, offset, rofixup->contents + fixup_offset);
+ }
+ rofixup->reloc_count++;
+
+ if (entry && entry->symndx)
+ {
+ /* See discussion about symndx == 0 in _bfinfdpic_add_dyn_reloc
+ above. */
+ BFD_ASSERT (entry->fixups > 0);
+ entry->fixups--;
+ }
+
+ return fixup_offset;
+}
+
+/* Find the segment number in which OSEC, and output section, is
+ located. */
+
+static unsigned
+_bfinfdpic_osec_to_segment (bfd *output_bfd, asection *osec)
+{
+ struct elf_segment_map *m;
+ Elf_Internal_Phdr *p;
+
+ /* Find the segment that contains the output_section. */
+ for (m = elf_tdata (output_bfd)->segment_map,
+ p = elf_tdata (output_bfd)->phdr;
+ m != NULL;
+ m = m->next, p++)
+ {
+ int i;
+
+ for (i = m->count - 1; i >= 0; i--)
+ if (m->sections[i] == osec)
+ break;
+
+ if (i >= 0)
+ break;
+ }
+
+ return p - elf_tdata (output_bfd)->phdr;
+}
+
+inline static bfd_boolean
+_bfinfdpic_osec_readonly_p (bfd *output_bfd, asection *osec)
+{
+ unsigned seg = _bfinfdpic_osec_to_segment (output_bfd, osec);
+
+ return ! (elf_tdata (output_bfd)->phdr[seg].p_flags & PF_W);
+}
+
+/* Generate relocations for GOT entries, function descriptors, and
+ code for PLT and lazy PLT entries. */
+
+inline static bfd_boolean
+_bfinfdpic_emit_got_relocs_plt_entries (struct bfinfdpic_relocs_info *entry,
+ bfd *output_bfd,
+ struct bfd_link_info *info,
+ asection *sec,
+ Elf_Internal_Sym *sym,
+ bfd_vma addend)
+
+{
+ bfd_vma fd_lazy_rel_offset = (bfd_vma)-1;
+ int dynindx = -1;
+
+ if (entry->done)
+ return TRUE;
+ entry->done = 1;
+
+ if (entry->got_entry || entry->fdgot_entry || entry->fd_entry)
+ {
+ /* If the symbol is dynamic, consider it for dynamic
+ relocations, otherwise decay to section + offset. */
+ if (entry->symndx == -1 && entry->d.h->dynindx != -1)
+ dynindx = entry->d.h->dynindx;
+ else
+ {
+ if (sec->output_section
+ && ! bfd_is_abs_section (sec->output_section)
+ && ! bfd_is_und_section (sec->output_section))
+ dynindx = elf_section_data (sec->output_section)->dynindx;
+ else
+ dynindx = 0;
+ }
+ }
+
+ /* Generate relocation for GOT entry pointing to the symbol. */
+ if (entry->got_entry)
+ {
+ int idx = dynindx;
+ bfd_vma ad = addend;
+
+ /* If the symbol is dynamic but binds locally, use
+ section+offset. */
+ if (sec && (entry->symndx != -1
+ || BFINFDPIC_SYM_LOCAL (info, entry->d.h)))
+ {
+ if (entry->symndx == -1)
+ ad += entry->d.h->root.u.def.value;
+ else
+ ad += sym->st_value;
+ ad += sec->output_offset;
+ if (sec->output_section && elf_section_data (sec->output_section))
+ idx = elf_section_data (sec->output_section)->dynindx;
+ else
+ idx = 0;
+ }
+
+ /* If we're linking an executable at a fixed address, we can
+ omit the dynamic relocation as long as the symbol is local to
+ this module. */
+ if (info->executable && !info->pie
+ && (entry->symndx != -1
+ || BFINFDPIC_SYM_LOCAL (info, entry->d.h)))
+ {
+ if (sec)
+ ad += sec->output_section->vma;
+ if (entry->symndx != -1
+ || entry->d.h->root.type != bfd_link_hash_undefweak)
+ _bfinfdpic_add_rofixup (output_bfd,
+ bfinfdpic_gotfixup_section (info),
+ bfinfdpic_got_section (info)->output_section
+ ->vma
+ + bfinfdpic_got_section (info)->output_offset
+ + bfinfdpic_got_initial_offset (info)
+ + entry->got_entry, entry);
+ }
+ else
+ _bfinfdpic_add_dyn_reloc (output_bfd, bfinfdpic_gotrel_section (info),
+ _bfd_elf_section_offset
+ (output_bfd, info,
+ bfinfdpic_got_section (info),
+ bfinfdpic_got_initial_offset (info)
+ + entry->got_entry)
+ + bfinfdpic_got_section (info)
+ ->output_section->vma
+ + bfinfdpic_got_section (info)->output_offset,
+ R_byte4_data, idx, ad, entry);
+
+ bfd_put_32 (output_bfd, ad,
+ bfinfdpic_got_section (info)->contents
+ + bfinfdpic_got_initial_offset (info)
+ + entry->got_entry);
+ }
+
+ /* Generate relocation for GOT entry pointing to a canonical
+ function descriptor. */
+ if (entry->fdgot_entry)
+ {
+ int reloc, idx;
+ bfd_vma ad = 0;
+
+ if (! (entry->symndx == -1
+ && entry->d.h->root.type == bfd_link_hash_undefweak
+ && BFINFDPIC_SYM_LOCAL (info, entry->d.h)))
+ {
+ /* If the symbol is dynamic and there may be dynamic symbol
+ resolution because we are, or are linked with, a shared
+ library, emit a FUNCDESC relocation such that the dynamic
+ linker will allocate the function descriptor. If the
+ symbol needs a non-local function descriptor but binds
+ locally (e.g., its visibility is protected, emit a
+ dynamic relocation decayed to section+offset. */
+ if (entry->symndx == -1
+ && ! BFINFDPIC_FUNCDESC_LOCAL (info, entry->d.h)
+ && BFINFDPIC_SYM_LOCAL (info, entry->d.h)
+ && !(info->executable && !info->pie))
+ {
+ reloc = R_BFIN_FUNCDESC;
+ idx = elf_section_data (entry->d.h->root.u.def.section
+ ->output_section)->dynindx;
+ ad = entry->d.h->root.u.def.section->output_offset
+ + entry->d.h->root.u.def.value;
+ }
+ else if (entry->symndx == -1
+ && ! BFINFDPIC_FUNCDESC_LOCAL (info, entry->d.h))
+ {
+ reloc = R_BFIN_FUNCDESC;
+ idx = dynindx;
+ ad = addend;
+ if (ad)
+ return FALSE;
+ }
+ else
+ {
+ /* Otherwise, we know we have a private function descriptor,
+ so reference it directly. */
+ if (elf_hash_table (info)->dynamic_sections_created)
+ BFD_ASSERT (entry->privfd);
+ reloc = R_byte4_data;
+ idx = elf_section_data (bfinfdpic_got_section (info)
+ ->output_section)->dynindx;
+ ad = bfinfdpic_got_section (info)->output_offset
+ + bfinfdpic_got_initial_offset (info) + entry->fd_entry;
+ }
+
+ /* If there is room for dynamic symbol resolution, emit the
+ dynamic relocation. However, if we're linking an
+ executable at a fixed location, we won't have emitted a
+ dynamic symbol entry for the got section, so idx will be
+ zero, which means we can and should compute the address
+ of the private descriptor ourselves. */
+ if (info->executable && !info->pie
+ && (entry->symndx != -1
+ || BFINFDPIC_FUNCDESC_LOCAL (info, entry->d.h)))
+ {
+ ad += bfinfdpic_got_section (info)->output_section->vma;
+ _bfinfdpic_add_rofixup (output_bfd,
+ bfinfdpic_gotfixup_section (info),
+ bfinfdpic_got_section (info)
+ ->output_section->vma
+ + bfinfdpic_got_section (info)
+ ->output_offset
+ + bfinfdpic_got_initial_offset (info)
+ + entry->fdgot_entry, entry);
+ }
+ else
+ _bfinfdpic_add_dyn_reloc (output_bfd,
+ bfinfdpic_gotrel_section (info),
+ _bfd_elf_section_offset
+ (output_bfd, info,
+ bfinfdpic_got_section (info),
+ bfinfdpic_got_initial_offset (info)
+ + entry->fdgot_entry)
+ + bfinfdpic_got_section (info)
+ ->output_section->vma
+ + bfinfdpic_got_section (info)
+ ->output_offset,
+ reloc, idx, ad, entry);
+ }
+
+ bfd_put_32 (output_bfd, ad,
+ bfinfdpic_got_section (info)->contents
+ + bfinfdpic_got_initial_offset (info)
+ + entry->fdgot_entry);
+ }
+
+ /* Generate relocation to fill in a private function descriptor in
+ the GOT. */
+ if (entry->fd_entry)
+ {
+ int idx = dynindx;
+ bfd_vma ad = addend;
+ bfd_vma ofst;
+ long lowword, highword;
+
+ /* If the symbol is dynamic but binds locally, use
+ section+offset. */
+ if (sec && (entry->symndx != -1
+ || BFINFDPIC_SYM_LOCAL (info, entry->d.h)))
+ {
+ if (entry->symndx == -1)
+ ad += entry->d.h->root.u.def.value;
+ else
+ ad += sym->st_value;
+ ad += sec->output_offset;
+ if (sec->output_section && elf_section_data (sec->output_section))
+ idx = elf_section_data (sec->output_section)->dynindx;
+ else
+ idx = 0;
+ }
+
+ /* If we're linking an executable at a fixed address, we can
+ omit the dynamic relocation as long as the symbol is local to
+ this module. */
+ if (info->executable && !info->pie
+ && (entry->symndx != -1 || BFINFDPIC_SYM_LOCAL (info, entry->d.h)))
+ {
+ if (sec)
+ ad += sec->output_section->vma;
+ ofst = 0;
+ if (entry->symndx != -1
+ || entry->d.h->root.type != bfd_link_hash_undefweak)
+ {
+ _bfinfdpic_add_rofixup (output_bfd,
+ bfinfdpic_gotfixup_section (info),
+ bfinfdpic_got_section (info)
+ ->output_section->vma
+ + bfinfdpic_got_section (info)
+ ->output_offset
+ + bfinfdpic_got_initial_offset (info)
+ + entry->fd_entry, entry);
+ _bfinfdpic_add_rofixup (output_bfd,
+ bfinfdpic_gotfixup_section (info),
+ bfinfdpic_got_section (info)
+ ->output_section->vma
+ + bfinfdpic_got_section (info)
+ ->output_offset
+ + bfinfdpic_got_initial_offset (info)
+ + entry->fd_entry + 4, entry);
+ }
+ }
+ else
+ {
+ ofst
+ = _bfinfdpic_add_dyn_reloc (output_bfd,
+ entry->lazyplt
+ ? bfinfdpic_pltrel_section (info)
+ : bfinfdpic_gotrel_section (info),
+ _bfd_elf_section_offset
+ (output_bfd, info,
+ bfinfdpic_got_section (info),
+ bfinfdpic_got_initial_offset (info)
+ + entry->fd_entry)
+ + bfinfdpic_got_section (info)
+ ->output_section->vma
+ + bfinfdpic_got_section (info)
+ ->output_offset,
+ R_BFIN_FUNCDESC_VALUE, idx, ad, entry);
+ }
+
+ /* If we've omitted the dynamic relocation, just emit the fixed
+ addresses of the symbol and of the local GOT base offset. */
+ if (info->executable && !info->pie && sec && sec->output_section)
+ {
+ lowword = ad;
+ highword = bfinfdpic_got_section (info)->output_section->vma
+ + bfinfdpic_got_section (info)->output_offset
+ + bfinfdpic_got_initial_offset (info);
+ }
+ else if (entry->lazyplt)
+ {
+ if (ad)
+ return FALSE;
+
+ fd_lazy_rel_offset = ofst;
+
+ /* A function descriptor used for lazy or local resolving is
+ initialized such that its high word contains the output
+ section index in which the PLT entries are located, and
+ the low word contains the address of the lazy PLT entry
+ entry point, that must be within the memory region
+ assigned to that section. */
+ lowword = entry->lzplt_entry + 4
+ + bfinfdpic_plt_section (info)->output_offset
+ + bfinfdpic_plt_section (info)->output_section->vma;
+ highword = _bfinfdpic_osec_to_segment
+ (output_bfd, bfinfdpic_plt_section (info)->output_section);
+ }
+ else
+ {
+ /* A function descriptor for a local function gets the index
+ of the section. For a non-local function, it's
+ disregarded. */
+ lowword = ad;
+ if (entry->symndx == -1 && entry->d.h->dynindx != -1
+ && entry->d.h->dynindx == idx)
+ highword = 0;
+ else
+ highword = _bfinfdpic_osec_to_segment
+ (output_bfd, sec->output_section);
+ }
+
+ bfd_put_32 (output_bfd, lowword,
+ bfinfdpic_got_section (info)->contents
+ + bfinfdpic_got_initial_offset (info)
+ + entry->fd_entry);
+ bfd_put_32 (output_bfd, highword,
+ bfinfdpic_got_section (info)->contents
+ + bfinfdpic_got_initial_offset (info)
+ + entry->fd_entry + 4);
+ }
+
+ /* Generate code for the PLT entry. */
+ if (entry->plt_entry != (bfd_vma) -1)
+ {
+ bfd_byte *plt_code = bfinfdpic_plt_section (info)->contents
+ + entry->plt_entry;
+
+ BFD_ASSERT (entry->fd_entry);
+
+ /* Figure out what kind of PLT entry we need, depending on the
+ location of the function descriptor within the GOT. */
+ if (entry->fd_entry >= -(1 << (18 - 1))
+ && entry->fd_entry + 4 < (1 << (18 - 1)))
+ {
+ /* P1 = [P3 + fd_entry]; P3 = [P3 + fd_entry + 4] */
+ bfd_put_32 (output_bfd,
+ 0xe519 | ((entry->fd_entry << 14) & 0xFFFF0000),
+ plt_code);
+ bfd_put_32 (output_bfd,
+ 0xe51b | (((entry->fd_entry + 4) << 14) & 0xFFFF0000),
+ plt_code + 4);
+ plt_code += 8;
+ }
+ else
+ {
+ /* P1.L = fd_entry; P1.H = fd_entry;
+ P3 = P3 + P1;
+ P1 = [P3];
+ P3 = [P3 + 4]; */
+ bfd_put_32 (output_bfd,
+ 0xe109 | (entry->fd_entry << 16),
+ plt_code);
+ bfd_put_32 (output_bfd,
+ 0xe149 | (entry->fd_entry & 0xFFFF0000),
+ plt_code + 4);
+ bfd_put_16 (output_bfd, 0x5ad9, plt_code + 8);
+ bfd_put_16 (output_bfd, 0x9159, plt_code + 10);
+ bfd_put_16 (output_bfd, 0xac5b, plt_code + 12);
+ plt_code += 14;
+ }
+ /* JUMP (P1) */
+ bfd_put_16 (output_bfd, 0x0051, plt_code);
+ }
+
+ /* Generate code for the lazy PLT entry. */
+ if (entry->lzplt_entry != (bfd_vma) -1)
+ {
+ bfd_byte *lzplt_code = bfinfdpic_plt_section (info)->contents
+ + entry->lzplt_entry;
+ bfd_vma resolverStub_addr;
+
+ bfd_put_32 (output_bfd, fd_lazy_rel_offset, lzplt_code);
+ lzplt_code += 4;
+
+ resolverStub_addr = entry->lzplt_entry / BFINFDPIC_LZPLT_BLOCK_SIZE
+ * BFINFDPIC_LZPLT_BLOCK_SIZE + BFINFDPIC_LZPLT_RESOLV_LOC;
+ if (resolverStub_addr >= bfinfdpic_plt_initial_offset (info))
+ resolverStub_addr = bfinfdpic_plt_initial_offset (info) - LZPLT_NORMAL_SIZE - LZPLT_RESOLVER_EXTRA;
+
+ if (entry->lzplt_entry == resolverStub_addr)
+ {
+ /* This is a lazy PLT entry that includes a resolver call.
+ P2 = [P3];
+ R3 = [P3 + 4];
+ JUMP (P2); */
+ bfd_put_32 (output_bfd,
+ 0xa05b915a,
+ lzplt_code);
+ bfd_put_16 (output_bfd, 0x0052, lzplt_code + 4);
+ }
+ else
+ {
+ /* JUMP.S resolverStub */
+ bfd_put_16 (output_bfd,
+ 0x2000
+ | (((resolverStub_addr - entry->lzplt_entry)
+ / 2) & (((bfd_vma)1 << 12) - 1)),
+ lzplt_code);
+ }
+ }
+
+ return TRUE;
+}
+
/* Look through the relocs for a section during the first phase, and
allocate space in the global offset table or procedure linkage
return reloc_class_normal;
}
}
+\f
+/* Relocate an Blackfin ELF section.
+
+ The RELOCATE_SECTION function is called by the new ELF backend linker
+ to handle the relocations for a section.
+
+ The relocs are always passed as Rela structures; if the section
+ actually uses Rel structures, the r_addend field will always be
+ zero.
+
+ This function is responsible for adjusting the section contents as
+ necessary, and (if using Rela relocs and generating a relocatable
+ output file) adjusting the reloc addend as necessary.
+
+ This function does not have to worry about setting the reloc
+ address or the reloc symbol index.
+
+ LOCAL_SYMS is a pointer to the swapped in local symbols.
+
+ LOCAL_SECTIONS is an array giving the section in the input file
+ corresponding to the st_shndx field of each local symbol.
+
+ The global hash table entry for the global symbols can be found
+ via elf_sym_hashes (input_bfd).
+
+ When generating relocatable output, this function must handle
+ STB_LOCAL/STT_SECTION symbols specially. The output symbol is
+ going to be the section symbol corresponding to the output
+ section, which means that the addend must be adjusted
+ accordingly. */
static bfd_boolean
-bfin_relocate_section (bfd * output_bfd,
- struct bfd_link_info *info,
- bfd * input_bfd,
- asection * input_section,
- bfd_byte * contents,
- Elf_Internal_Rela * relocs,
- Elf_Internal_Sym * local_syms,
- asection ** local_sections)
+bfinfdpic_relocate_section (bfd * output_bfd,
+ struct bfd_link_info *info,
+ bfd * input_bfd,
+ asection * input_section,
+ bfd_byte * contents,
+ Elf_Internal_Rela * relocs,
+ Elf_Internal_Sym * local_syms,
+ asection ** local_sections)
{
- bfd *dynobj;
Elf_Internal_Shdr *symtab_hdr;
struct elf_link_hash_entry **sym_hashes;
- bfd_vma *local_got_offsets;
- asection *sgot;
- asection *sreloc;
Elf_Internal_Rela *rel;
Elf_Internal_Rela *relend;
- int i = 0;
+ unsigned isec_segment, got_segment, plt_segment,
+ check_segment[2];
+ int silence_segment_error = !(info->shared || info->pie);
if (info->relocatable)
return TRUE;
- dynobj = elf_hash_table (info)->dynobj;
- symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
+ symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
sym_hashes = elf_sym_hashes (input_bfd);
- local_got_offsets = elf_local_got_offsets (input_bfd);
-
- sgot = NULL;
- sreloc = NULL;
+ relend = relocs + input_section->reloc_count;
+
+ isec_segment = _bfinfdpic_osec_to_segment (output_bfd,
+ input_section->output_section);
+ if (IS_FDPIC (output_bfd) && bfinfdpic_got_section (info))
+ got_segment = _bfinfdpic_osec_to_segment (output_bfd,
+ bfinfdpic_got_section (info)
+ ->output_section);
+ else
+ got_segment = -1;
+ if (IS_FDPIC (output_bfd) && elf_hash_table (info)->dynamic_sections_created)
+ plt_segment = _bfinfdpic_osec_to_segment (output_bfd,
+ bfinfdpic_plt_section (info)
+ ->output_section);
+ else
+ plt_segment = -1;
- rel = relocs;
- relend = relocs + input_section->reloc_count;
- for (; rel < relend; rel++, i++)
+ for (rel = relocs; rel < relend; rel ++)
{
- int r_type;
reloc_howto_type *howto;
unsigned long r_symndx;
- struct elf_link_hash_entry *h;
Elf_Internal_Sym *sym;
asection *sec;
- bfd_vma relocation = 0;
- bfd_boolean unresolved_reloc;
+ struct elf_link_hash_entry *h;
+ bfd_vma relocation;
bfd_reloc_status_type r;
- bfd_vma address;
+ const char * name = NULL;
+ int r_type;
+ asection *osec;
+ struct bfinfdpic_relocs_info *picrel;
+ bfd_vma orig_addend = rel->r_addend;
r_type = ELF32_R_TYPE (rel->r_info);
- if (r_type < 0 || r_type >= 243)
- {
- bfd_set_error (bfd_error_bad_value);
- return FALSE;
- }
- if (r_type == R_BFIN_GNU_VTENTRY
- || r_type == R_BFIN_GNU_VTINHERIT)
+ if (r_type == R_BFIN_GNU_VTINHERIT
+ || r_type == R_BFIN_GNU_VTENTRY)
continue;
+ /* This is a final link. */
+ r_symndx = ELF32_R_SYM (rel->r_info);
howto = bfin_reloc_type_lookup (input_bfd, r_type);
if (howto == NULL)
{
bfd_set_error (bfd_error_bad_value);
return FALSE;
}
- r_symndx = ELF32_R_SYM (rel->r_info);
- h = NULL;
- sym = NULL;
- sec = NULL;
- unresolved_reloc = FALSE;
+ h = NULL;
+ sym = NULL;
+ sec = NULL;
if (r_symndx < symtab_hdr->sh_info)
{
sym = local_syms + r_symndx;
- sec = local_sections[r_symndx];
+ osec = sec = local_sections [r_symndx];
relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
+
+ name = bfd_elf_string_from_elf_section
+ (input_bfd, symtab_hdr->sh_link, sym->st_name);
+ name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
}
else
{
- bfd_boolean warned;
- h = NULL;
- RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
- r_symndx, symtab_hdr, sym_hashes,
- h, sec, relocation,
- unresolved_reloc, warned);
- }
+ h = sym_hashes [r_symndx - symtab_hdr->sh_info];
- address = rel->r_offset;
+ while (h->root.type == bfd_link_hash_indirect
+ || h->root.type == bfd_link_hash_warning)
+ h = (struct elf_link_hash_entry *) h->root.u.i.link;
- /* Then, process normally. */
- switch (r_type)
+ name = h->root.root.string;
+
+ if ((h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ && ! BFINFDPIC_SYM_LOCAL (info, h))
+ {
+ sec = NULL;
+ relocation = 0;
+ }
+ else
+ if (h->root.type == bfd_link_hash_defined
+ || 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);
+ }
+ else if (h->root.type == bfd_link_hash_undefweak)
+ {
+ relocation = 0;
+ }
+ else if (info->unresolved_syms_in_objects == RM_IGNORE
+ && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
+ relocation = 0;
+ else
+ {
+ if (! ((*info->callbacks->undefined_symbol)
+ (info, h->root.root.string, input_bfd,
+ input_section, rel->r_offset,
+ (info->unresolved_syms_in_objects == RM_GENERATE_ERROR
+ || ELF_ST_VISIBILITY (h->other)))))
+ return FALSE;
+ relocation = 0;
+ }
+ osec = sec;
+ }
+
+ switch (r_type)
{
- case R_BFIN_GNU_VTINHERIT:
- case R_BFIN_GNU_VTENTRY:
- return bfd_reloc_ok;
+ case R_pcrel24:
+ case R_pcrel24_jump_l:
+ case R_byte4_data:
+ if (! IS_FDPIC (output_bfd))
+ goto non_fdpic;
+
+ case R_BFIN_GOT17M4:
+ case R_BFIN_GOTHI:
+ case R_BFIN_GOTLO:
+ case R_BFIN_FUNCDESC_GOT17M4:
+ case R_BFIN_FUNCDESC_GOTHI:
+ case R_BFIN_FUNCDESC_GOTLO:
+ case R_BFIN_GOTOFF17M4:
+ case R_BFIN_GOTOFFHI:
+ case R_BFIN_GOTOFFLO:
+ case R_BFIN_FUNCDESC_GOTOFF17M4:
+ case R_BFIN_FUNCDESC_GOTOFFHI:
+ case R_BFIN_FUNCDESC_GOTOFFLO:
+ case R_BFIN_FUNCDESC:
+ case R_BFIN_FUNCDESC_VALUE:
+ if (h != NULL)
+ picrel = bfinfdpic_relocs_info_for_global (bfinfdpic_relocs_info
+ (info), input_bfd, h,
+ orig_addend, INSERT);
+ else
+ /* In order to find the entry we created before, we must
+ use the original addend, not the one that may have been
+ modified by _bfd_elf_rela_local_sym(). */
+ picrel = bfinfdpic_relocs_info_for_local (bfinfdpic_relocs_info
+ (info), input_bfd, r_symndx,
+ orig_addend, INSERT);
+ if (! picrel)
+ return FALSE;
- case R_got:
- /* Relocation is to the address of the entry for this symbol
- in the global offset table. */
- if (h != NULL
- && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
- goto do_default;
- /* Fall through. */
- /* Relocation is the offset of the entry for this symbol in
- the global offset table. */
+ if (!_bfinfdpic_emit_got_relocs_plt_entries (picrel, output_bfd, info,
+ osec, sym,
+ rel->r_addend))
+ {
+ (*_bfd_error_handler)
+ (_("%B: relocation at `%A+0x%x' references symbol `%s' with nonzero addend"),
+ input_bfd, input_section, rel->r_offset, name);
+ return FALSE;
+
+ }
+
+ break;
+
+ default:
+ non_fdpic:
+ picrel = NULL;
+ if (h && ! BFINFDPIC_SYM_LOCAL (info, h))
+ {
+ info->callbacks->warning
+ (info, _("relocation references symbol not defined in the module"),
+ name, input_bfd, input_section, rel->r_offset);
+ return FALSE;
+ }
+ break;
+ }
+
+ switch (r_type)
+ {
+ case R_pcrel24:
+ case R_pcrel24_jump_l:
+ check_segment[0] = isec_segment;
+ if (! IS_FDPIC (output_bfd))
+ check_segment[1] = isec_segment;
+ else if (picrel->plt)
+ {
+ relocation = bfinfdpic_plt_section (info)->output_section->vma
+ + bfinfdpic_plt_section (info)->output_offset
+ + picrel->plt_entry;
+ check_segment[1] = plt_segment;
+ }
+ /* We don't want to warn on calls to undefined weak symbols,
+ as calls to them must be protected by non-NULL tests
+ anyway, and unprotected calls would invoke undefined
+ behavior. */
+ else if (picrel->symndx == -1
+ && picrel->d.h->root.type == bfd_link_hash_undefweak)
+ check_segment[1] = check_segment[0];
+ else
+ check_segment[1] = sec
+ ? _bfinfdpic_osec_to_segment (output_bfd, sec->output_section)
+ : (unsigned)-1;
+ break;
+
+ case R_BFIN_GOT17M4:
+ case R_BFIN_GOTHI:
+ case R_BFIN_GOTLO:
+ relocation = picrel->got_entry;
+ check_segment[0] = check_segment[1] = got_segment;
+ break;
+ case R_BFIN_FUNCDESC_GOT17M4:
+ case R_BFIN_FUNCDESC_GOTHI:
+ case R_BFIN_FUNCDESC_GOTLO:
+ relocation = picrel->fdgot_entry;
+ check_segment[0] = check_segment[1] = got_segment;
+ break;
+
+ case R_BFIN_GOTOFFHI:
+ case R_BFIN_GOTOFF17M4:
+ case R_BFIN_GOTOFFLO:
+ relocation -= bfinfdpic_got_section (info)->output_section->vma
+ + bfinfdpic_got_section (info)->output_offset
+ + bfinfdpic_got_initial_offset (info);
+ check_segment[0] = got_segment;
+ check_segment[1] = sec
+ ? _bfinfdpic_osec_to_segment (output_bfd, sec->output_section)
+ : (unsigned)-1;
+ break;
+
+ case R_BFIN_FUNCDESC_GOTOFF17M4:
+ case R_BFIN_FUNCDESC_GOTOFFHI:
+ case R_BFIN_FUNCDESC_GOTOFFLO:
+ relocation = picrel->fd_entry;
+ check_segment[0] = check_segment[1] = got_segment;
+ break;
+
+ case R_BFIN_FUNCDESC:
{
- bfd_vma off;
+ int dynindx;
+ bfd_vma addend = rel->r_addend;
- if (sgot == NULL)
+ if (! (h && h->root.type == bfd_link_hash_undefweak
+ && BFINFDPIC_SYM_LOCAL (info, h)))
{
- sgot = bfd_get_section_by_name (dynobj, ".got");
- BFD_ASSERT (sgot != NULL);
+ /* If the symbol is dynamic and there may be dynamic
+ symbol resolution because we are or are linked with a
+ shared library, emit a FUNCDESC relocation such that
+ the dynamic linker will allocate the function
+ descriptor. If the symbol needs a non-local function
+ descriptor but binds locally (e.g., its visibility is
+ protected, emit a dynamic relocation decayed to
+ section+offset. */
+ if (h && ! BFINFDPIC_FUNCDESC_LOCAL (info, h)
+ && BFINFDPIC_SYM_LOCAL (info, h)
+ && !(info->executable && !info->pie))
+ {
+ dynindx = elf_section_data (h->root.u.def.section
+ ->output_section)->dynindx;
+ addend += h->root.u.def.section->output_offset
+ + h->root.u.def.value;
+ }
+ else if (h && ! BFINFDPIC_FUNCDESC_LOCAL (info, h))
+ {
+ if (addend)
+ {
+ info->callbacks->warning
+ (info, _("R_BFIN_FUNCDESC references dynamic symbol with nonzero addend"),
+ name, input_bfd, input_section, rel->r_offset);
+ return FALSE;
+ }
+ dynindx = h->dynindx;
+ }
+ else
+ {
+ /* Otherwise, we know we have a private function
+ descriptor, so reference it directly. */
+ BFD_ASSERT (picrel->privfd);
+ r_type = R_byte4_data;
+ dynindx = elf_section_data (bfinfdpic_got_section (info)
+ ->output_section)->dynindx;
+ addend = bfinfdpic_got_section (info)->output_offset
+ + bfinfdpic_got_initial_offset (info)
+ + picrel->fd_entry;
+ }
+
+ /* If there is room for dynamic symbol resolution, emit
+ the dynamic relocation. However, if we're linking an
+ executable at a fixed location, we won't have emitted a
+ dynamic symbol entry for the got section, so idx will
+ be zero, which means we can and should compute the
+ address of the private descriptor ourselves. */
+ if (info->executable && !info->pie
+ && (!h || BFINFDPIC_FUNCDESC_LOCAL (info, h)))
+ {
+ addend += bfinfdpic_got_section (info)->output_section->vma;
+ if ((bfd_get_section_flags (output_bfd,
+ input_section->output_section)
+ & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD))
+ {
+ if (_bfinfdpic_osec_readonly_p (output_bfd,
+ input_section
+ ->output_section))
+ {
+ info->callbacks->warning
+ (info,
+ _("cannot emit fixups in read-only section"),
+ name, input_bfd, input_section, rel->r_offset);
+ return FALSE;
+ }
+ _bfinfdpic_add_rofixup (output_bfd,
+ bfinfdpic_gotfixup_section
+ (info),
+ _bfd_elf_section_offset
+ (output_bfd, info,
+ input_section, rel->r_offset)
+ + input_section
+ ->output_section->vma
+ + input_section->output_offset,
+ picrel);
+ }
+ }
+ else if ((bfd_get_section_flags (output_bfd,
+ input_section->output_section)
+ & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD))
+ {
+ if (_bfinfdpic_osec_readonly_p (output_bfd,
+ input_section
+ ->output_section))
+ {
+ info->callbacks->warning
+ (info,
+ _("cannot emit dynamic relocations in read-only section"),
+ name, input_bfd, input_section, rel->r_offset);
+ return FALSE;
+ }
+ _bfinfdpic_add_dyn_reloc (output_bfd,
+ bfinfdpic_gotrel_section (info),
+ _bfd_elf_section_offset
+ (output_bfd, info,
+ input_section, rel->r_offset)
+ + input_section
+ ->output_section->vma
+ + input_section->output_offset,
+ r_type, dynindx, addend, picrel);
+ }
+ else
+ addend += bfinfdpic_got_section (info)->output_section->vma;
}
- if (h != NULL)
- {
- bfd_boolean dyn;
+ /* We want the addend in-place because dynamic
+ relocations are REL. Setting relocation to it should
+ arrange for it to be installed. */
+ relocation = addend - rel->r_addend;
+ }
+ check_segment[0] = check_segment[1] = got_segment;
+ break;
- off = h->got.offset;
- BFD_ASSERT (off != (bfd_vma) - 1);
- dyn = elf_hash_table (info)->dynamic_sections_created;
+ case R_byte4_data:
+ if (! IS_FDPIC (output_bfd))
+ {
+ check_segment[0] = check_segment[1] = -1;
+ break;
+ }
+ /* Fall through. */
+ case R_BFIN_FUNCDESC_VALUE:
+ {
+ int dynindx;
+ bfd_vma addend = rel->r_addend;
- if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
- || (info->shared
- && (info->symbolic
- || h->dynindx == -1
- || h->forced_local)
- && h->def_regular))
+ /* If the symbol is dynamic but binds locally, use
+ section+offset. */
+ if (h && ! BFINFDPIC_SYM_LOCAL (info, h))
+ {
+ if (addend && r_type == R_BFIN_FUNCDESC_VALUE)
{
- /* 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.
+ info->callbacks->warning
+ (info, _("R_BFIN_FUNCDESC_VALUE references dynamic symbol with nonzero addend"),
+ name, input_bfd, input_section, rel->r_offset);
+ return FALSE;
+ }
+ dynindx = h->dynindx;
+ }
+ else
+ {
+ if (h)
+ addend += h->root.u.def.value;
+ else
+ addend += sym->st_value;
+ if (osec)
+ addend += osec->output_offset;
+ if (osec && osec->output_section
+ && ! bfd_is_abs_section (osec->output_section)
+ && ! bfd_is_und_section (osec->output_section))
+ dynindx = elf_section_data (osec->output_section)->dynindx;
+ else
+ dynindx = 0;
+ }
- 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
+ /* If we're linking an executable at a fixed address, we
+ can omit the dynamic relocation as long as the symbol
+ is defined in the current link unit (which is implied
+ by its output section not being NULL). */
+ if (info->executable && !info->pie
+ && (!h || BFINFDPIC_SYM_LOCAL (info, h)))
+ {
+ if (osec)
+ addend += osec->output_section->vma;
+ if (IS_FDPIC (input_bfd)
+ && (bfd_get_section_flags (output_bfd,
+ input_section->output_section)
+ & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD))
+ {
+ if (_bfinfdpic_osec_readonly_p (output_bfd,
+ input_section
+ ->output_section))
{
- bfd_put_32 (output_bfd, relocation,
- sgot->contents + off);
- h->got.offset |= 1;
+ info->callbacks->warning
+ (info,
+ _("cannot emit fixups in read-only section"),
+ name, input_bfd, input_section, rel->r_offset);
+ return FALSE;
+ }
+ if (!h || h->root.type != bfd_link_hash_undefweak)
+ {
+ _bfinfdpic_add_rofixup (output_bfd,
+ bfinfdpic_gotfixup_section
+ (info),
+ _bfd_elf_section_offset
+ (output_bfd, info,
+ input_section, rel->r_offset)
+ + input_section
+ ->output_section->vma
+ + input_section->output_offset,
+ picrel);
+ if (r_type == R_BFIN_FUNCDESC_VALUE)
+ _bfinfdpic_add_rofixup
+ (output_bfd,
+ bfinfdpic_gotfixup_section (info),
+ _bfd_elf_section_offset
+ (output_bfd, info,
+ input_section, rel->r_offset)
+ + input_section->output_section->vma
+ + input_section->output_offset + 4, picrel);
}
}
- else
- unresolved_reloc = FALSE;
}
else
{
- BFD_ASSERT (local_got_offsets != NULL);
- off = local_got_offsets[r_symndx];
- BFD_ASSERT (off != (bfd_vma) - 1);
-
- /* 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
+ if ((bfd_get_section_flags (output_bfd,
+ input_section->output_section)
+ & (SEC_ALLOC | SEC_LOAD)) == (SEC_ALLOC | SEC_LOAD))
{
- bfd_put_32 (output_bfd, relocation, sgot->contents + off);
-
- if (info->shared)
+ if (_bfinfdpic_osec_readonly_p (output_bfd,
+ input_section
+ ->output_section))
{
- asection *s;
- Elf_Internal_Rela outrel;
- bfd_byte *loc;
-
- s = bfd_get_section_by_name (dynobj, ".rela.got");
- BFD_ASSERT (s != NULL);
-
- outrel.r_offset = (sgot->output_section->vma
- + sgot->output_offset + off);
- outrel.r_info =
- ELF32_R_INFO (0, R_pcrel24);
- outrel.r_addend = relocation;
- loc = s->contents;
- loc +=
- s->reloc_count++ * sizeof (Elf32_External_Rela);
- bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
+ info->callbacks->warning
+ (info,
+ _("cannot emit dynamic relocations in read-only section"),
+ name, input_bfd, input_section, rel->r_offset);
+ return FALSE;
}
-
- local_got_offsets[r_symndx] |= 1;
+ _bfinfdpic_add_dyn_reloc (output_bfd,
+ bfinfdpic_gotrel_section (info),
+ _bfd_elf_section_offset
+ (output_bfd, info,
+ input_section, rel->r_offset)
+ + input_section
+ ->output_section->vma
+ + input_section->output_offset,
+ r_type, dynindx, addend, picrel);
}
+ else if (osec)
+ addend += osec->output_section->vma;
+ /* We want the addend in-place because dynamic
+ relocations are REL. Setting relocation to it
+ should arrange for it to be installed. */
+ relocation = addend - rel->r_addend;
}
- relocation = sgot->output_offset + off;
- rel->r_addend = 0;
- /* bfin : preg = [preg + 17bitdiv4offset] relocation is div by 4. */
- relocation /= 4;
+ if (r_type == R_BFIN_FUNCDESC_VALUE)
+ {
+ /* If we've omitted the dynamic relocation, just emit
+ the fixed addresses of the symbol and of the local
+ GOT base offset. */
+ if (info->executable && !info->pie
+ && (!h || BFINFDPIC_SYM_LOCAL (info, h)))
+ bfd_put_32 (output_bfd,
+ bfinfdpic_got_section (info)->output_section->vma
+ + bfinfdpic_got_section (info)->output_offset
+ + bfinfdpic_got_initial_offset (info),
+ contents + rel->r_offset + 4);
+ else
+ /* A function descriptor used for lazy or local
+ resolving is initialized such that its high word
+ contains the output section index in which the
+ PLT entries are located, and the low word
+ contains the offset of the lazy PLT entry entry
+ point into that section. */
+ bfd_put_32 (output_bfd,
+ h && ! BFINFDPIC_SYM_LOCAL (info, h)
+ ? 0
+ : _bfinfdpic_osec_to_segment (output_bfd,
+ sec
+ ->output_section),
+ contents + rel->r_offset + 4);
+ }
}
- goto do_default;
-
- case R_pcrel24:
- case R_pcrel24_jump_l:
- {
- bfd_vma x;
+ check_segment[0] = check_segment[1] = got_segment;
+ break;
- relocation += rel->r_addend;
+ default:
+ check_segment[0] = isec_segment;
+ check_segment[1] = sec
+ ? _bfinfdpic_osec_to_segment (output_bfd, sec->output_section)
+ : (unsigned)-1;
+ break;
+ }
- /* Perform usual pc-relative correction. */
- relocation -= input_section->output_section->vma + input_section->output_offset;
- relocation -= address;
+ if (check_segment[0] != check_segment[1] && IS_FDPIC (output_bfd))
+ {
+#if 1 /* If you take this out, remove the #error from fdpic-static-6.d
+ in the ld testsuite. */
+ /* This helps catch problems in GCC while we can't do more
+ than static linking. The idea is to test whether the
+ input file basename is crt0.o only once. */
+ if (silence_segment_error == 1)
+ silence_segment_error =
+ (strlen (input_bfd->filename) == 6
+ && strcmp (input_bfd->filename, "crt0.o") == 0)
+ || (strlen (input_bfd->filename) > 6
+ && strcmp (input_bfd->filename
+ + strlen (input_bfd->filename) - 7,
+ "/crt0.o") == 0)
+ ? -1 : 0;
+#endif
+ if (!silence_segment_error
+ /* We don't want duplicate errors for undefined
+ symbols. */
+ && !(picrel && picrel->symndx == -1
+ && picrel->d.h->root.type == bfd_link_hash_undefined))
+ info->callbacks->warning
+ (info,
+ (info->shared || info->pie)
+ ? _("relocations between different segments are not supported")
+ : _("warning: relocation references a different segment"),
+ name, input_bfd, input_section, rel->r_offset);
+ if (!silence_segment_error && (info->shared || info->pie))
+ return FALSE;
+ elf_elfheader (output_bfd)->e_flags |= EF_BFIN_PIC;
+ }
- /* We are getting reloc_entry->address 2 byte off from
- the start of instruction. Assuming absolute postion
- of the reloc data. But, following code had been written assuming
- reloc address is starting at begining of instruction.
- To compensate that I have increased the value of
- relocation by 1 (effectively 2) and used the addr -2 instead of addr. */
+ switch (r_type)
+ {
+ case R_BFIN_GOTOFFHI:
+ /* We need the addend to be applied before we shift the
+ value right. */
+ relocation += rel->r_addend;
+ /* Fall through. */
+ case R_BFIN_GOTHI:
+ case R_BFIN_FUNCDESC_GOTHI:
+ case R_BFIN_FUNCDESC_GOTOFFHI:
+ relocation >>= 16;
+ /* Fall through. */
- relocation += 2;
- address -= 2;
+ case R_BFIN_GOTLO:
+ case R_BFIN_FUNCDESC_GOTLO:
+ case R_BFIN_GOTOFFLO:
+ case R_BFIN_FUNCDESC_GOTOFFLO:
+ relocation &= 0xffff;
+ break;
- relocation >>= 1;
+ default:
+ break;
+ }
- x = bfd_get_16 (input_bfd, contents + address);
- x = (x & 0xff00) | ((relocation >> 16) & 0xff);
- bfd_put_16 (input_bfd, x, contents + address);
+ switch (r_type)
+ {
+ case R_pcrel24:
+ case R_pcrel24_jump_l:
+ if (! IS_FDPIC (output_bfd) || ! picrel->plt)
+ break;
+ /* Fall through. */
- x = bfd_get_16 (input_bfd, contents + address + 2);
- x = relocation & 0xFFFF;
- bfd_put_16 (input_bfd, x, contents + address + 2);
- r = bfd_reloc_ok;
- }
+ /* When referencing a GOT entry, a function descriptor or a
+ PLT, we don't want the addend to apply to the reference,
+ but rather to the referenced symbol. The actual entry
+ will have already been created taking the addend into
+ account, so cancel it out here. */
+ case R_BFIN_GOT17M4:
+ case R_BFIN_GOTHI:
+ case R_BFIN_GOTLO:
+ case R_BFIN_FUNCDESC_GOT17M4:
+ case R_BFIN_FUNCDESC_GOTHI:
+ case R_BFIN_FUNCDESC_GOTLO:
+ case R_BFIN_FUNCDESC_GOTOFF17M4:
+ case R_BFIN_FUNCDESC_GOTOFFHI:
+ case R_BFIN_FUNCDESC_GOTOFFLO:
+ /* Note that we only want GOTOFFHI, not GOTOFFLO or GOTOFF17M4
+ here, since we do want to apply the addend to the others.
+ Note that we've applied the addend to GOTOFFHI before we
+ shifted it right. */
+ case R_BFIN_GOTOFFHI:
+ relocation -= rel->r_addend;
break;
default:
- do_default:
- r = _bfd_final_link_relocate (howto, input_bfd, input_section,
- contents, address,
- relocation, rel->r_addend);
-
break;
}
- /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
- because such sections are not SEC_ALLOC and thus ld.so will
- not process them. */
- if (unresolved_reloc
- && !((input_section->flags & SEC_DEBUGGING) != 0 && h->def_dynamic))
+ if (r_type == R_pcrel24
+ || r_type == R_pcrel24_jump_l)
{
- (*_bfd_error_handler)
- (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
- input_bfd,
- input_section, (long) rel->r_offset, h->root.root.string);
- return FALSE;
+ bfd_vma x;
+ bfd_vma address = rel->r_offset;
+
+ relocation += rel->r_addend;
+
+ /* Perform usual pc-relative correction. */
+ relocation -= input_section->output_section->vma + input_section->output_offset;
+ relocation -= address;
+
+ /* We are getting reloc_entry->address 2 byte off from
+ the start of instruction. Assuming absolute postion
+ of the reloc data. But, following code had been written assuming
+ reloc address is starting at begining of instruction.
+ To compensate that I have increased the value of
+ relocation by 1 (effectively 2) and used the addr -2 instead of addr. */
+
+ relocation += 2;
+ address -= 2;
+
+ relocation >>= 1;
+
+ x = bfd_get_16 (input_bfd, contents + address);
+ x = (x & 0xff00) | ((relocation >> 16) & 0xff);
+ bfd_put_16 (input_bfd, x, contents + address);
+
+ x = bfd_get_16 (input_bfd, contents + address + 2);
+ x = relocation & 0xFFFF;
+ bfd_put_16 (input_bfd, x, contents + address + 2);
+ r = bfd_reloc_ok;
}
+ else
+ r = _bfd_final_link_relocate (howto, input_bfd, input_section,
+ contents, rel->r_offset,
+ relocation, rel->r_addend);
if (r != bfd_reloc_ok)
{
- const char *name;
+ const char * msg = (const char *) NULL;
- if (h != NULL)
- name = h->root.root.string;
- else
+ switch (r)
{
- name = bfd_elf_string_from_elf_section (input_bfd,
- symtab_hdr->sh_link,
- sym->st_name);
+ case bfd_reloc_overflow:
+ r = info->callbacks->reloc_overflow
+ (info, (h ? &h->root : NULL), name, howto->name,
+ (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
+ break;
+
+ case bfd_reloc_undefined:
+ r = info->callbacks->undefined_symbol
+ (info, name, input_bfd, input_section, rel->r_offset, TRUE);
+ break;
+
+ case bfd_reloc_outofrange:
+ msg = _("internal error: out of range error");
+ break;
+
+ case bfd_reloc_notsupported:
+ msg = _("internal error: unsupported relocation error");
+ break;
+
+ case bfd_reloc_dangerous:
+ msg = _("internal error: dangerous relocation");
+ break;
+
+ default:
+ msg = _("internal error: unknown error");
+ break;
+ }
+
+ if (msg)
+ r = info->callbacks->warning
+ (info, msg, name, input_bfd, input_section, rel->r_offset);
+
+ if (! r)
+ return FALSE;
+ }
+ }
+
+ return TRUE;
+}
+
+static bfd_boolean
+bfin_relocate_section (bfd * output_bfd,
+ struct bfd_link_info *info,
+ bfd * input_bfd,
+ asection * input_section,
+ bfd_byte * contents,
+ Elf_Internal_Rela * relocs,
+ Elf_Internal_Sym * local_syms,
+ asection ** local_sections)
+{
+ bfd *dynobj;
+ Elf_Internal_Shdr *symtab_hdr;
+ struct elf_link_hash_entry **sym_hashes;
+ bfd_vma *local_got_offsets;
+ asection *sgot;
+ asection *sreloc;
+ Elf_Internal_Rela *rel;
+ Elf_Internal_Rela *relend;
+ int i = 0;
+
+ if (info->relocatable)
+ return TRUE;
+
+ dynobj = elf_hash_table (info)->dynobj;
+ symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
+ sym_hashes = elf_sym_hashes (input_bfd);
+ local_got_offsets = elf_local_got_offsets (input_bfd);
+
+ sgot = NULL;
+ sreloc = NULL;
+
+ rel = relocs;
+ relend = relocs + input_section->reloc_count;
+ for (; rel < relend; rel++, i++)
+ {
+ int r_type;
+ reloc_howto_type *howto;
+ unsigned long r_symndx;
+ struct elf_link_hash_entry *h;
+ Elf_Internal_Sym *sym;
+ asection *sec;
+ bfd_vma relocation = 0;
+ bfd_boolean unresolved_reloc;
+ bfd_reloc_status_type r;
+ bfd_vma address;
+
+ r_type = ELF32_R_TYPE (rel->r_info);
+ if (r_type < 0 || r_type >= 243)
+ {
+ bfd_set_error (bfd_error_bad_value);
+ return FALSE;
+ }
+
+ if (r_type == R_BFIN_GNU_VTENTRY
+ || r_type == R_BFIN_GNU_VTINHERIT)
+ continue;
+
+ howto = bfin_reloc_type_lookup (input_bfd, r_type);
+ if (howto == NULL)
+ {
+ bfd_set_error (bfd_error_bad_value);
+ return FALSE;
+ }
+ r_symndx = ELF32_R_SYM (rel->r_info);
+
+ h = NULL;
+ sym = NULL;
+ sec = NULL;
+ unresolved_reloc = FALSE;
+
+ if (r_symndx < symtab_hdr->sh_info)
+ {
+ sym = local_syms + r_symndx;
+ sec = local_sections[r_symndx];
+ relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
+ }
+ else
+ {
+ bfd_boolean warned;
+ h = NULL;
+ RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
+ r_symndx, symtab_hdr, sym_hashes,
+ h, sec, relocation,
+ unresolved_reloc, warned);
+ }
+
+ address = rel->r_offset;
+
+ /* Then, process normally. */
+ switch (r_type)
+ {
+ case R_BFIN_GNU_VTINHERIT:
+ case R_BFIN_GNU_VTENTRY:
+ return bfd_reloc_ok;
+
+ case R_got:
+ /* Relocation is to the address of the entry for this symbol
+ in the global offset table. */
+ if (h != NULL
+ && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
+ goto do_default;
+ /* Fall through. */
+ /* Relocation is the offset of the entry for this symbol in
+ the global offset table. */
+
+ {
+ bfd_vma off;
+
+ if (sgot == NULL)
+ {
+ sgot = bfd_get_section_by_name (dynobj, ".got");
+ BFD_ASSERT (sgot != NULL);
+ }
+
+ if (h != NULL)
+ {
+ bfd_boolean dyn;
+
+ off = h->got.offset;
+ BFD_ASSERT (off != (bfd_vma) - 1);
+ dyn = elf_hash_table (info)->dynamic_sections_created;
+
+ if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
+ || (info->shared
+ && (info->symbolic
+ || h->dynindx == -1
+ || h->forced_local)
+ && h->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;
+ }
+ }
+ else
+ unresolved_reloc = FALSE;
+ }
+ else
+ {
+ BFD_ASSERT (local_got_offsets != NULL);
+ off = local_got_offsets[r_symndx];
+ BFD_ASSERT (off != (bfd_vma) - 1);
+
+ /* 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 *s;
+ Elf_Internal_Rela outrel;
+ bfd_byte *loc;
+
+ s = bfd_get_section_by_name (dynobj, ".rela.got");
+ BFD_ASSERT (s != NULL);
+
+ outrel.r_offset = (sgot->output_section->vma
+ + sgot->output_offset + off);
+ outrel.r_info =
+ ELF32_R_INFO (0, R_pcrel24);
+ outrel.r_addend = relocation;
+ loc = s->contents;
+ loc +=
+ s->reloc_count++ * sizeof (Elf32_External_Rela);
+ bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
+ }
+
+ local_got_offsets[r_symndx] |= 1;
+ }
+ }
+
+ relocation = sgot->output_offset + off;
+ rel->r_addend = 0;
+ /* bfin : preg = [preg + 17bitdiv4offset] relocation is div by 4. */
+ relocation /= 4;
+ }
+ goto do_default;
+
+ case R_pcrel24:
+ case R_pcrel24_jump_l:
+ {
+ bfd_vma x;
+
+ relocation += rel->r_addend;
+
+ /* Perform usual pc-relative correction. */
+ relocation -= input_section->output_section->vma + input_section->output_offset;
+ relocation -= address;
+
+ /* We are getting reloc_entry->address 2 byte off from
+ the start of instruction. Assuming absolute postion
+ of the reloc data. But, following code had been written assuming
+ reloc address is starting at begining of instruction.
+ To compensate that I have increased the value of
+ relocation by 1 (effectively 2) and used the addr -2 instead of addr. */
+
+ relocation += 2;
+ address -= 2;
+
+ relocation >>= 1;
+
+ x = bfd_get_16 (input_bfd, contents + address);
+ x = (x & 0xff00) | ((relocation >> 16) & 0xff);
+ bfd_put_16 (input_bfd, x, contents + address);
+
+ x = bfd_get_16 (input_bfd, contents + address + 2);
+ x = relocation & 0xFFFF;
+ bfd_put_16 (input_bfd, x, contents + address + 2);
+ r = bfd_reloc_ok;
+ }
+ break;
+
+ default:
+ do_default:
+ r = _bfd_final_link_relocate (howto, input_bfd, input_section,
+ contents, address,
+ relocation, rel->r_addend);
+
+ break;
+ }
+
+ /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
+ because such sections are not SEC_ALLOC and thus ld.so will
+ not process them. */
+ if (unresolved_reloc
+ && !((input_section->flags & SEC_DEBUGGING) != 0 && h->def_dynamic))
+ {
+ (*_bfd_error_handler)
+ (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
+ input_bfd,
+ input_section, (long) rel->r_offset, h->root.root.string);
+ return FALSE;
+ }
+
+ if (r != bfd_reloc_ok)
+ {
+ const char *name;
+
+ if (h != NULL)
+ name = h->root.root.string;
+ else
+ {
+ name = bfd_elf_string_from_elf_section (input_bfd,
+ symtab_hdr->sh_link,
+ sym->st_name);
if (name == NULL)
return FALSE;
if (*name == '\0')
name = bfd_section_name (input_bfd, sec);
}
- if (r == bfd_reloc_overflow)
- {
- if (!(info->callbacks->reloc_overflow
- (info, (h ? &h->root : NULL), name, howto->name,
- (bfd_vma) 0, input_bfd, input_section, rel->r_offset)))
- return FALSE;
- }
+ if (r == bfd_reloc_overflow)
+ {
+ if (!(info->callbacks->reloc_overflow
+ (info, (h ? &h->root : NULL), name, howto->name,
+ (bfd_vma) 0, input_bfd, input_section, rel->r_offset)))
+ return FALSE;
+ }
+ else
+ {
+ (*_bfd_error_handler)
+ (_("%B(%A+0x%lx): reloc against `%s': error %d"),
+ input_bfd, input_section,
+ (long) rel->r_offset, name, (int) r);
+ return FALSE;
+ }
+ }
+ }
+
+ return TRUE;
+}
+
+static asection *
+bfin_gc_mark_hook (asection * sec,
+ struct bfd_link_info *info ATTRIBUTE_UNUSED,
+ Elf_Internal_Rela * rel,
+ struct elf_link_hash_entry *h,
+ Elf_Internal_Sym * sym)
+{
+ if (h != NULL)
+ {
+ switch (ELF32_R_TYPE (rel->r_info))
+ {
+
+ case R_BFIN_GNU_VTINHERIT:
+ case R_BFIN_GNU_VTENTRY:
+ break;
+
+ default:
+ switch (h->root.type)
+ {
+ default:
+ break;
+
+ case bfd_link_hash_defined:
+ case bfd_link_hash_defweak:
+ return h->root.u.def.section;
+
+ case bfd_link_hash_common:
+ return h->root.u.c.p->section;
+ }
+ }
+ }
+ else
+ return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
+
+ return NULL;
+}
+
+
+/* Update the got entry reference counts for the section being removed. */
+
+static bfd_boolean
+bfinfdpic_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED,
+ struct bfd_link_info *info ATTRIBUTE_UNUSED,
+ asection *sec ATTRIBUTE_UNUSED,
+ const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED)
+{
+ return TRUE;
+}
+
+/* Update the got entry reference counts for the section being removed. */
+
+static bfd_boolean
+bfin_gc_sweep_hook (bfd * abfd,
+ struct bfd_link_info *info,
+ asection * sec,
+ const Elf_Internal_Rela * relocs)
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ struct elf_link_hash_entry **sym_hashes;
+ bfd_signed_vma *local_got_refcounts;
+ const Elf_Internal_Rela *rel, *relend;
+ bfd *dynobj;
+ asection *sgot;
+ asection *srelgot;
+
+ dynobj = elf_hash_table (info)->dynobj;
+ if (dynobj == NULL)
+ return TRUE;
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ sym_hashes = elf_sym_hashes (abfd);
+ local_got_refcounts = elf_local_got_refcounts (abfd);
+
+ sgot = bfd_get_section_by_name (dynobj, ".got");
+ srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
+
+ relend = relocs + sec->reloc_count;
+ for (rel = relocs; rel < relend; rel++)
+ {
+ unsigned long r_symndx;
+ struct elf_link_hash_entry *h;
+
+ switch (ELF32_R_TYPE (rel->r_info))
+ {
+ case R_got:
+ r_symndx = ELF32_R_SYM (rel->r_info);
+ if (r_symndx >= symtab_hdr->sh_info)
+ {
+ h = sym_hashes[r_symndx - symtab_hdr->sh_info];
+ if (h->got.refcount > 0)
+ {
+ --h->got.refcount;
+ if (h->got.refcount == 0)
+ {
+ /* We don't need the .got entry any more. */
+ sgot->size -= 4;
+ srelgot->size -= sizeof (Elf32_External_Rela);
+ }
+ }
+ }
+ else if (local_got_refcounts != NULL)
+ {
+ if (local_got_refcounts[r_symndx] > 0)
+ {
+ --local_got_refcounts[r_symndx];
+ if (local_got_refcounts[r_symndx] == 0)
+ {
+ /* We don't need the .got entry any more. */
+ sgot->size -= 4;
+ if (info->shared)
+ srelgot->size -= sizeof (Elf32_External_Rela);
+ }
+ }
+ }
+ break;
+ default:
+ break;
+ }
+ }
+ return TRUE;
+}
+
+/* We need dynamic symbols for every section, since segments can
+ relocate independently. */
+static bfd_boolean
+_bfinfdpic_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
+ struct bfd_link_info *info
+ ATTRIBUTE_UNUSED,
+ asection *p ATTRIBUTE_UNUSED)
+{
+ switch (elf_section_data (p)->this_hdr.sh_type)
+ {
+ case SHT_PROGBITS:
+ case SHT_NOBITS:
+ /* If sh_type is yet undecided, assume it could be
+ SHT_PROGBITS/SHT_NOBITS. */
+ case SHT_NULL:
+ return FALSE;
+
+ /* There shouldn't be section relative relocations
+ against any other section. */
+ default:
+ return TRUE;
+ }
+}
+
+/* Create a .got section, as well as its additional info field. This
+ is almost entirely copied from
+ elflink.c:_bfd_elf_create_got_section(). */
+
+static bfd_boolean
+_bfin_create_got_section (bfd *abfd, struct bfd_link_info *info)
+{
+ flagword flags, pltflags;
+ asection *s;
+ struct elf_link_hash_entry *h;
+ struct bfd_link_hash_entry *bh;
+ const struct elf_backend_data *bed = get_elf_backend_data (abfd);
+ int ptralign;
+ int offset;
+
+ /* This function may be called more than once. */
+ s = bfd_get_section_by_name (abfd, ".got");
+ if (s != NULL && (s->flags & SEC_LINKER_CREATED) != 0)
+ return TRUE;
+
+ /* Machine specific: although pointers are 32-bits wide, we want the
+ GOT to be aligned to a 64-bit boundary, such that function
+ descriptors in it can be accessed with 64-bit loads and
+ stores. */
+ ptralign = 3;
+
+ flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
+ | SEC_LINKER_CREATED);
+ pltflags = flags;
+
+ s = bfd_make_section_with_flags (abfd, ".got", flags);
+ if (s == NULL
+ || !bfd_set_section_alignment (abfd, s, ptralign))
+ return FALSE;
+
+ if (bed->want_got_plt)
+ {
+ s = bfd_make_section_with_flags (abfd, ".got.plt", flags);
+ if (s == NULL
+ || !bfd_set_section_alignment (abfd, s, ptralign))
+ return FALSE;
+ }
+
+ if (bed->want_got_sym)
+ {
+ /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
+ (or .got.plt) section. We don't do this in the linker script
+ because we don't want to define the symbol if we are not creating
+ a global offset table. */
+ h = _bfd_elf_define_linkage_sym (abfd, info, s, "_GLOBAL_OFFSET_TABLE_");
+ elf_hash_table (info)->hgot = h;
+ if (h == NULL)
+ return FALSE;
+
+ /* Machine-specific: we want the symbol for executables as
+ well. */
+ if (! bfd_elf_link_record_dynamic_symbol (info, h))
+ return FALSE;
+ }
+
+ /* The first bit of the global offset table is the header. */
+ s->size += bed->got_header_size;
+
+ /* This is the machine-specific part. Create and initialize section
+ data for the got. */
+ if (IS_FDPIC (abfd))
+ {
+ bfinfdpic_got_section (info) = s;
+ bfinfdpic_relocs_info (info) = htab_try_create (1,
+ bfinfdpic_relocs_info_hash,
+ bfinfdpic_relocs_info_eq,
+ (htab_del) NULL);
+ if (! bfinfdpic_relocs_info (info))
+ return FALSE;
+
+ s = bfd_make_section_with_flags (abfd, ".rel.got",
+ (flags | SEC_READONLY));
+ if (s == NULL
+ || ! bfd_set_section_alignment (abfd, s, 2))
+ return FALSE;
+
+ bfinfdpic_gotrel_section (info) = s;
+
+ /* Machine-specific. */
+ s = bfd_make_section_with_flags (abfd, ".rofixup",
+ (flags | SEC_READONLY));
+ if (s == NULL
+ || ! bfd_set_section_alignment (abfd, s, 2))
+ return FALSE;
+
+ bfinfdpic_gotfixup_section (info) = s;
+ offset = -2048;
+ flags = BSF_GLOBAL;
+ }
+ else
+ {
+ offset = 2048;
+ flags = BSF_GLOBAL | BSF_WEAK;
+ }
+
+ /* Define _gp in .rofixup, for FDPIC, or .got otherwise. If it
+ turns out that we're linking with a different linker script, the
+ linker script will override it. */
+ bh = NULL;
+ if (!(_bfd_generic_link_add_one_symbol
+ (info, abfd, "_gp", flags, s, offset, (const char *) NULL, FALSE,
+ bed->collect, &bh)))
+ return FALSE;
+ h = (struct elf_link_hash_entry *) bh;
+ h->def_regular = 1;
+ h->type = STT_OBJECT;
+ /* h->other = STV_HIDDEN; */ /* Should we? */
+
+ /* Machine-specific: we want the symbol for executables as well. */
+ if (IS_FDPIC (abfd) && ! bfd_elf_link_record_dynamic_symbol (info, h))
+ return FALSE;
+
+ return TRUE;
+}
+
+/* Make sure the got and plt sections exist, and that our pointers in
+ the link hash table point to them. */
+
+static bfd_boolean
+elf32_bfinfdpic_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
+{
+ /* This is mostly copied from
+ elflink.c:_bfd_elf_create_dynamic_sections(). */
+ flagword flags, pltflags;
+ asection *s;
+ const struct elf_backend_data *bed = get_elf_backend_data (abfd);
+
+ /* 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_CODE | 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;
+ /* Blackfin-specific: remember it. */
+ bfinfdpic_plt_section (info) = s;
+
+ if (bed->want_plt_sym)
+ {
+ /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
+ .plt section. */
+ struct elf_link_hash_entry *h;
+ struct bfd_link_hash_entry *bh = NULL;
+
+ if (! (_bfd_generic_link_add_one_symbol
+ (info, abfd, "_PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL, s, 0, NULL,
+ FALSE, get_elf_backend_data (abfd)->collect, &bh)))
+ return FALSE;
+ h = (struct elf_link_hash_entry *) bh;
+ h->def_regular = 1;
+ h->type = STT_OBJECT;
+
+ if (! info->executable
+ && ! bfd_elf_link_record_dynamic_symbol (info, h))
+ return FALSE;
+ }
+
+ /* Blackfin-specific: we want rel relocations for the plt. */
+ s = bfd_make_section (abfd, ".rel.plt");
+ if (s == NULL
+ || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
+ || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
+ return FALSE;
+ /* Blackfin-specific: remember it. */
+ bfinfdpic_pltrel_section (info) = s;
+
+ /* Blackfin-specific: we want to create the GOT in the Blackfin way. */
+ if (! _bfin_create_got_section (abfd, info))
+ return FALSE;
+
+ /* Blackfin-specific: make sure we created everything we wanted. */
+ BFD_ASSERT (bfinfdpic_got_section (info) && bfinfdpic_gotrel_section (info)
+ /* && bfinfdpic_gotfixup_section (info) */
+ && bfinfdpic_plt_section (info)
+ && bfinfdpic_pltrel_section (info));
+
+ 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 | SEC_LINKER_CREATED))
+ 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, bed->s->log_file_align))
+ return FALSE;
+ }
+ }
+
+ return TRUE;
+}
+
+/* The name of the dynamic interpreter. This is put in the .interp
+ section. */
+
+#define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1"
+
+#define DEFAULT_STACK_SIZE 0x20000
+
+/* This structure is used to collect the number of entries present in
+ each addressable range of the got. */
+struct _bfinfdpic_dynamic_got_info
+{
+ /* Several bits of information about the current link. */
+ struct bfd_link_info *info;
+ /* Total size needed for GOT entries within the 18- or 32-bit
+ ranges. */
+ bfd_vma got17m4, gothilo;
+ /* Total size needed for function descriptor entries within the 18-
+ or 32-bit ranges. */
+ bfd_vma fd17m4, fdhilo;
+ /* Total size needed function descriptor entries referenced in PLT
+ entries, that would be profitable to place in offsets close to
+ the PIC register. */
+ bfd_vma fdplt;
+ /* Total size needed by lazy PLT entries. */
+ bfd_vma lzplt;
+ /* Number of relocations carried over from input object files. */
+ unsigned long relocs;
+ /* Number of fixups introduced by relocations in input object files. */
+ unsigned long fixups;
+};
+
+/* Compute the total GOT size required by each symbol in each range.
+ Symbols may require up to 4 words in the GOT: an entry pointing to
+ the symbol, an entry pointing to its function descriptor, and a
+ private function descriptors taking two words. */
+
+static int
+_bfinfdpic_count_got_plt_entries (void **entryp, void *dinfo_)
+{
+ struct bfinfdpic_relocs_info *entry = *entryp;
+ struct _bfinfdpic_dynamic_got_info *dinfo = dinfo_;
+ unsigned relocs = 0, fixups = 0;
+
+ /* Allocate space for a GOT entry pointing to the symbol. */
+ if (entry->got17m4)
+ dinfo->got17m4 += 4;
+ else if (entry->gothilo)
+ dinfo->gothilo += 4;
+ else
+ entry->relocs32--;
+ entry->relocs32++;
+
+ /* Allocate space for a GOT entry pointing to the function
+ descriptor. */
+ if (entry->fdgot17m4)
+ dinfo->got17m4 += 4;
+ else if (entry->fdgothilo)
+ dinfo->gothilo += 4;
+ else
+ entry->relocsfd--;
+ entry->relocsfd++;
+
+ /* Decide whether we need a PLT entry, a function descriptor in the
+ GOT, and a lazy PLT entry for this symbol. */
+ entry->plt = entry->call
+ && entry->symndx == -1 && ! BFINFDPIC_SYM_LOCAL (dinfo->info, entry->d.h)
+ && elf_hash_table (dinfo->info)->dynamic_sections_created;
+ entry->privfd = entry->plt
+ || entry->fdgoff17m4 || entry->fdgoffhilo
+ || ((entry->fd || entry->fdgot17m4 || entry->fdgothilo)
+ && (entry->symndx != -1
+ || BFINFDPIC_FUNCDESC_LOCAL (dinfo->info, entry->d.h)));
+ entry->lazyplt = entry->privfd
+ && entry->symndx == -1 && ! BFINFDPIC_SYM_LOCAL (dinfo->info, entry->d.h)
+ && ! (dinfo->info->flags & DF_BIND_NOW)
+ && elf_hash_table (dinfo->info)->dynamic_sections_created;
+
+ /* Allocate space for a function descriptor. */
+ if (entry->fdgoff17m4)
+ dinfo->fd17m4 += 8;
+ else if (entry->privfd && entry->plt)
+ dinfo->fdplt += 8;
+ else if (entry->privfd)
+ dinfo->fdhilo += 8;
+ else
+ entry->relocsfdv--;
+ entry->relocsfdv++;
+
+ if (entry->lazyplt)
+ dinfo->lzplt += LZPLT_NORMAL_SIZE;
+
+ if (!dinfo->info->executable || dinfo->info->pie)
+ relocs = entry->relocs32 + entry->relocsfd + entry->relocsfdv;
+ else
+ {
+ if (entry->symndx != -1 || BFINFDPIC_SYM_LOCAL (dinfo->info, entry->d.h))
+ {
+ if (entry->symndx != -1
+ || entry->d.h->root.type != bfd_link_hash_undefweak)
+ fixups += entry->relocs32 + 2 * entry->relocsfdv;
+ }
+ else
+ relocs += entry->relocs32 + entry->relocsfdv;
+
+ if (entry->symndx != -1
+ || BFINFDPIC_FUNCDESC_LOCAL (dinfo->info, entry->d.h))
+ {
+ if (entry->symndx != -1
+ || entry->d.h->root.type != bfd_link_hash_undefweak)
+ fixups += entry->relocsfd;
+ }
+ else
+ relocs += entry->relocsfd;
+ }
+
+ entry->dynrelocs += relocs;
+ entry->fixups += fixups;
+ dinfo->relocs += relocs;
+ dinfo->fixups += fixups;
+
+ return 1;
+}
+
+/* This structure is used to assign offsets to got entries, function
+ descriptors, plt entries and lazy plt entries. */
+
+struct _bfinfdpic_dynamic_got_plt_info
+{
+ /* Summary information collected with _bfinfdpic_count_got_plt_entries. */
+ struct _bfinfdpic_dynamic_got_info g;
+
+ /* For each addressable range, we record a MAX (positive) and MIN
+ (negative) value. CUR is used to assign got entries, and it's
+ incremented from an initial positive value to MAX, then from MIN
+ to FDCUR (unless FDCUR wraps around first). FDCUR is used to
+ assign function descriptors, and it's decreased from an initial
+ non-positive value to MIN, then from MAX down to CUR (unless CUR
+ wraps around first). All of MIN, MAX, CUR and FDCUR always point
+ to even words. ODD, if non-zero, indicates an odd word to be
+ used for the next got entry, otherwise CUR is used and
+ incremented by a pair of words, wrapping around when it reaches
+ MAX. FDCUR is decremented (and wrapped) before the next function
+ descriptor is chosen. FDPLT indicates the number of remaining
+ slots that can be used for function descriptors used only by PLT
+ entries. */
+ struct _bfinfdpic_dynamic_got_alloc_data
+ {
+ bfd_signed_vma max, cur, odd, fdcur, min;
+ bfd_vma fdplt;
+ } got17m4, gothilo;
+};
+
+/* Determine the positive and negative ranges to be used by each
+ offset range in the GOT. FDCUR and CUR, that must be aligned to a
+ double-word boundary, are the minimum (negative) and maximum
+ (positive) GOT offsets already used by previous ranges, except for
+ an ODD entry that may have been left behind. GOT and FD indicate
+ the size of GOT entries and function descriptors that must be
+ placed within the range from -WRAP to WRAP. If there's room left,
+ up to FDPLT bytes should be reserved for additional function
+ descriptors. */
+
+inline static bfd_signed_vma
+_bfinfdpic_compute_got_alloc_data (struct _bfinfdpic_dynamic_got_alloc_data *gad,
+ bfd_signed_vma fdcur,
+ bfd_signed_vma odd,
+ bfd_signed_vma cur,
+ bfd_vma got,
+ bfd_vma fd,
+ bfd_vma fdplt,
+ bfd_vma wrap)
+{
+ bfd_signed_vma wrapmin = -wrap;
+
+ /* Start at the given initial points. */
+ gad->fdcur = fdcur;
+ gad->cur = cur;
+
+ /* If we had an incoming odd word and we have any got entries that
+ are going to use it, consume it, otherwise leave gad->odd at
+ zero. We might force gad->odd to zero and return the incoming
+ odd such that it is used by the next range, but then GOT entries
+ might appear to be out of order and we wouldn't be able to
+ shorten the GOT by one word if it turns out to end with an
+ unpaired GOT entry. */
+ if (odd && got)
+ {
+ gad->odd = odd;
+ got -= 4;
+ odd = 0;
+ }
+ else
+ gad->odd = 0;
+
+ /* If we're left with an unpaired GOT entry, compute its location
+ such that we can return it. Otherwise, if got doesn't require an
+ odd number of words here, either odd was already zero in the
+ block above, or it was set to zero because got was non-zero, or
+ got was already zero. In the latter case, we want the value of
+ odd to carry over to the return statement, so we don't want to
+ reset odd unless the condition below is true. */
+ if (got & 4)
+ {
+ odd = cur + got;
+ got += 4;
+ }
+
+ /* Compute the tentative boundaries of this range. */
+ gad->max = cur + got;
+ gad->min = fdcur - fd;
+ gad->fdplt = 0;
+
+ /* If function descriptors took too much space, wrap some of them
+ around. */
+ if (gad->min < wrapmin)
+ {
+ gad->max += wrapmin - gad->min;
+ gad->min = wrapmin;
+ }
+ /* If there is space left and we have function descriptors
+ referenced in PLT entries that could take advantage of shorter
+ offsets, place them here. */
+ else if (fdplt && gad->min > wrapmin)
+ {
+ bfd_vma fds;
+ if ((bfd_vma) (gad->min - wrapmin) < fdplt)
+ fds = gad->min - wrapmin;
+ else
+ fds = fdplt;
+
+ fdplt -= fds;
+ gad->min -= fds;
+ gad->fdplt += fds;
+ }
+
+ /* If GOT entries took too much space, wrap some of them around.
+ This may well cause gad->min to become lower than wrapmin. This
+ will cause a relocation overflow later on, so we don't have to
+ report it here . */
+ if ((bfd_vma) gad->max > wrap)
+ {
+ gad->min -= gad->max - wrap;
+ gad->max = wrap;
+ }
+ /* If there is more space left, try to place some more function
+ descriptors for PLT entries. */
+ else if (fdplt && (bfd_vma) gad->max < wrap)
+ {
+ bfd_vma fds;
+ if ((bfd_vma) (wrap - gad->max) < fdplt)
+ fds = wrap - gad->max;
+ else
+ fds = fdplt;
+
+ fdplt -= fds;
+ gad->max += fds;
+ gad->fdplt += fds;
+ }
+
+ /* If odd was initially computed as an offset past the wrap point,
+ wrap it around. */
+ if (odd > gad->max)
+ odd = gad->min + odd - gad->max;
+
+ /* _bfinfdpic_get_got_entry() below will always wrap gad->cur if needed
+ before returning, so do it here too. This guarantees that,
+ should cur and fdcur meet at the wrap point, they'll both be
+ equal to min. */
+ if (gad->cur == gad->max)
+ gad->cur = gad->min;
+
+ return odd;
+}
+
+/* Compute the location of the next GOT entry, given the allocation
+ data for a range. */
+
+inline static bfd_signed_vma
+_bfinfdpic_get_got_entry (struct _bfinfdpic_dynamic_got_alloc_data *gad)
+{
+ bfd_signed_vma ret;
+
+ if (gad->odd)
+ {
+ /* If there was an odd word left behind, use it. */
+ ret = gad->odd;
+ gad->odd = 0;
+ }
+ else
+ {
+ /* Otherwise, use the word pointed to by cur, reserve the next
+ as an odd word, and skip to the next pair of words, possibly
+ wrapping around. */
+ ret = gad->cur;
+ gad->odd = gad->cur + 4;
+ gad->cur += 8;
+ if (gad->cur == gad->max)
+ gad->cur = gad->min;
+ }
+
+ return ret;
+}
+
+/* Compute the location of the next function descriptor entry in the
+ GOT, given the allocation data for a range. */
+
+inline static bfd_signed_vma
+_bfinfdpic_get_fd_entry (struct _bfinfdpic_dynamic_got_alloc_data *gad)
+{
+ /* If we're at the bottom, wrap around, and only then allocate the
+ next pair of words. */
+ if (gad->fdcur == gad->min)
+ gad->fdcur = gad->max;
+ return gad->fdcur -= 8;
+}
+
+/* Assign GOT offsets for every GOT entry and function descriptor.
+ Doing everything in a single pass is tricky. */
+
+static int
+_bfinfdpic_assign_got_entries (void **entryp, void *info_)
+{
+ struct bfinfdpic_relocs_info *entry = *entryp;
+ struct _bfinfdpic_dynamic_got_plt_info *dinfo = info_;
+
+ if (entry->got17m4)
+ entry->got_entry = _bfinfdpic_get_got_entry (&dinfo->got17m4);
+ else if (entry->gothilo)
+ entry->got_entry = _bfinfdpic_get_got_entry (&dinfo->gothilo);
+
+ if (entry->fdgot17m4)
+ entry->fdgot_entry = _bfinfdpic_get_got_entry (&dinfo->got17m4);
+ else if (entry->fdgothilo)
+ entry->fdgot_entry = _bfinfdpic_get_got_entry (&dinfo->gothilo);
+
+ if (entry->fdgoff17m4)
+ entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->got17m4);
+ else if (entry->plt && dinfo->got17m4.fdplt)
+ {
+ dinfo->got17m4.fdplt -= 8;
+ entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->got17m4);
+ }
+ else if (entry->plt)
+ {
+ dinfo->gothilo.fdplt -= 8;
+ entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->gothilo);
+ }
+ else if (entry->privfd)
+ entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->gothilo);
+
+ return 1;
+}
+
+/* Assign GOT offsets to private function descriptors used by PLT
+ entries (or referenced by 32-bit offsets), as well as PLT entries
+ and lazy PLT entries. */
+
+static int
+_bfinfdpic_assign_plt_entries (void **entryp, void *info_)
+{
+ struct bfinfdpic_relocs_info *entry = *entryp;
+ struct _bfinfdpic_dynamic_got_plt_info *dinfo = info_;
+
+ /* If this symbol requires a local function descriptor, allocate
+ one. */
+ if (entry->privfd && entry->fd_entry == 0)
+ {
+ if (dinfo->got17m4.fdplt)
+ {
+ entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->got17m4);
+ dinfo->got17m4.fdplt -= 8;
+ }
+ else
+ {
+ BFD_ASSERT (dinfo->gothilo.fdplt);
+ entry->fd_entry = _bfinfdpic_get_fd_entry (&dinfo->gothilo);
+ dinfo->gothilo.fdplt -= 8;
+ }
+ }
+
+ if (entry->plt)
+ {
+ int size;
+
+ /* We use the section's raw size to mark the location of the
+ next PLT entry. */
+ entry->plt_entry = bfinfdpic_plt_section (dinfo->g.info)->size;
+
+ /* Figure out the length of this PLT entry based on the
+ addressing mode we need to reach the function descriptor. */
+ BFD_ASSERT (entry->fd_entry);
+ if (entry->fd_entry >= -(1 << (18 - 1))
+ && entry->fd_entry + 4 < (1 << (18 - 1)))
+ size = 10;
+ else
+ size = 16;
+
+ bfinfdpic_plt_section (dinfo->g.info)->size += size;
+ }
+
+ if (entry->lazyplt)
+ {
+ entry->lzplt_entry = dinfo->g.lzplt;
+ dinfo->g.lzplt += LZPLT_NORMAL_SIZE;
+ /* If this entry is the one that gets the resolver stub, account
+ for the additional instruction. */
+ if (entry->lzplt_entry % BFINFDPIC_LZPLT_BLOCK_SIZE
+ == BFINFDPIC_LZPLT_RESOLV_LOC)
+ dinfo->g.lzplt += LZPLT_RESOLVER_EXTRA;
+ }
+
+ return 1;
+}
+
+/* Follow indirect and warning hash entries so that each got entry
+ points to the final symbol definition. P must point to a pointer
+ to the hash table we're traversing. Since this traversal may
+ modify the hash table, we set this pointer to NULL to indicate
+ we've made a potentially-destructive change to the hash table, so
+ the traversal must be restarted. */
+static int
+_bfinfdpic_resolve_final_relocs_info (void **entryp, void *p)
+{
+ struct bfinfdpic_relocs_info *entry = *entryp;
+ htab_t *htab = p;
+
+ if (entry->symndx == -1)
+ {
+ struct elf_link_hash_entry *h = entry->d.h;
+ struct bfinfdpic_relocs_info *oentry;
+
+ while (h->root.type == bfd_link_hash_indirect
+ || h->root.type == bfd_link_hash_warning)
+ h = (struct elf_link_hash_entry *)h->root.u.i.link;
+
+ if (entry->d.h == h)
+ return 1;
+
+ oentry = bfinfdpic_relocs_info_for_global (*htab, 0, h, entry->addend,
+ NO_INSERT);
+
+ if (oentry)
+ {
+ /* Merge the two entries. */
+ bfinfdpic_pic_merge_early_relocs_info (oentry, entry);
+ htab_clear_slot (*htab, entryp);
+ return 1;
+ }
+
+ entry->d.h = h;
+
+ /* If we can't find this entry with the new bfd hash, re-insert
+ it, and get the traversal restarted. */
+ if (! htab_find (*htab, entry))
+ {
+ htab_clear_slot (*htab, entryp);
+ entryp = htab_find_slot (*htab, entry, INSERT);
+ if (! *entryp)
+ *entryp = entry;
+ /* Abort the traversal, since the whole table may have
+ moved, and leave it up to the parent to restart the
+ process. */
+ *(htab_t *)p = NULL;
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+/* Set the sizes of the dynamic sections. */
+
+static bfd_boolean
+elf32_bfinfdpic_size_dynamic_sections (bfd *output_bfd,
+ struct bfd_link_info *info)
+{
+ bfd *dynobj;
+ asection *s;
+ struct _bfinfdpic_dynamic_got_plt_info gpinfo;
+ bfd_signed_vma odd;
+ bfd_vma limit;
+
+ 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->executable)
+ {
+ s = bfd_get_section_by_name (dynobj, ".interp");
+ BFD_ASSERT (s != NULL);
+ s->size = sizeof ELF_DYNAMIC_INTERPRETER;
+ s->contents = (bfd_byte *) ELF_DYNAMIC_INTERPRETER;
+ }
+ }
+
+ memset (&gpinfo, 0, sizeof (gpinfo));
+ gpinfo.g.info = info;
+
+ for (;;)
+ {
+ htab_t relocs = bfinfdpic_relocs_info (info);
+
+ htab_traverse (relocs, _bfinfdpic_resolve_final_relocs_info, &relocs);
+
+ if (relocs == bfinfdpic_relocs_info (info))
+ break;
+ }
+
+ htab_traverse (bfinfdpic_relocs_info (info), _bfinfdpic_count_got_plt_entries,
+ &gpinfo.g);
+
+ odd = 12;
+ /* Compute the total size taken by entries in the 18-bit range,
+ to tell how many PLT function descriptors we can bring into it
+ without causing it to overflow. */
+ limit = odd + gpinfo.g.got17m4 + gpinfo.g.fd17m4;
+ if (limit < (bfd_vma)1 << 18)
+ limit = ((bfd_vma)1 << 18) - limit;
+ else
+ limit = 0;
+ if (gpinfo.g.fdplt < limit)
+ limit = gpinfo.g.fdplt;
+
+ /* Determine the ranges of GOT offsets that we can use for each
+ range of addressing modes. */
+ odd = _bfinfdpic_compute_got_alloc_data (&gpinfo.got17m4,
+ 0,
+ odd,
+ 16,
+ gpinfo.g.got17m4,
+ gpinfo.g.fd17m4,
+ limit,
+ (bfd_vma)1 << (18-1));
+ odd = _bfinfdpic_compute_got_alloc_data (&gpinfo.gothilo,
+ gpinfo.got17m4.min,
+ odd,
+ gpinfo.got17m4.max,
+ gpinfo.g.gothilo,
+ gpinfo.g.fdhilo,
+ gpinfo.g.fdplt - gpinfo.got17m4.fdplt,
+ (bfd_vma)1 << (32-1));
+
+ /* Now assign (most) GOT offsets. */
+ htab_traverse (bfinfdpic_relocs_info (info), _bfinfdpic_assign_got_entries,
+ &gpinfo);
+
+ bfinfdpic_got_section (info)->size = gpinfo.gothilo.max
+ - gpinfo.gothilo.min
+ /* If an odd word is the last word of the GOT, we don't need this
+ word to be part of the GOT. */
+ - (odd + 4 == gpinfo.gothilo.max ? 4 : 0);
+ if (bfinfdpic_got_section (info)->size == 0)
+ bfinfdpic_got_section (info)->flags |= SEC_EXCLUDE;
+ else if (bfinfdpic_got_section (info)->size == 12
+ && ! elf_hash_table (info)->dynamic_sections_created)
+ {
+ bfinfdpic_got_section (info)->flags |= SEC_EXCLUDE;
+ bfinfdpic_got_section (info)->size = 0;
+ }
+ else
+ {
+ bfinfdpic_got_section (info)->contents =
+ (bfd_byte *) bfd_zalloc (dynobj,
+ bfinfdpic_got_section (info)->size);
+ if (bfinfdpic_got_section (info)->contents == NULL)
+ return FALSE;
+ }
+
+ if (elf_hash_table (info)->dynamic_sections_created)
+ /* Subtract the number of lzplt entries, since those will generate
+ relocations in the pltrel section. */
+ bfinfdpic_gotrel_section (info)->size =
+ (gpinfo.g.relocs - gpinfo.g.lzplt / LZPLT_NORMAL_SIZE)
+ * get_elf_backend_data (output_bfd)->s->sizeof_rel;
+ else
+ BFD_ASSERT (gpinfo.g.relocs == 0);
+ if (bfinfdpic_gotrel_section (info)->size == 0)
+ bfinfdpic_gotrel_section (info)->flags |= SEC_EXCLUDE;
+ else
+ {
+ bfinfdpic_gotrel_section (info)->contents =
+ (bfd_byte *) bfd_zalloc (dynobj,
+ bfinfdpic_gotrel_section (info)->size);
+ if (bfinfdpic_gotrel_section (info)->contents == NULL)
+ return FALSE;
+ }
+
+ bfinfdpic_gotfixup_section (info)->size = (gpinfo.g.fixups + 1) * 4;
+ if (bfinfdpic_gotfixup_section (info)->size == 0)
+ bfinfdpic_gotfixup_section (info)->flags |= SEC_EXCLUDE;
+ else
+ {
+ bfinfdpic_gotfixup_section (info)->contents =
+ (bfd_byte *) bfd_zalloc (dynobj,
+ bfinfdpic_gotfixup_section (info)->size);
+ if (bfinfdpic_gotfixup_section (info)->contents == NULL)
+ return FALSE;
+ }
+
+ if (elf_hash_table (info)->dynamic_sections_created)
+ {
+ bfinfdpic_pltrel_section (info)->size =
+ gpinfo.g.lzplt / LZPLT_NORMAL_SIZE * get_elf_backend_data (output_bfd)->s->sizeof_rel;
+ if (bfinfdpic_pltrel_section (info)->size == 0)
+ bfinfdpic_pltrel_section (info)->flags |= SEC_EXCLUDE;
+ else
+ {
+ bfinfdpic_pltrel_section (info)->contents =
+ (bfd_byte *) bfd_zalloc (dynobj,
+ bfinfdpic_pltrel_section (info)->size);
+ if (bfinfdpic_pltrel_section (info)->contents == NULL)
+ return FALSE;
+ }
+ }
+
+ /* Add 4 bytes for every block of at most 65535 lazy PLT entries,
+ such that there's room for the additional instruction needed to
+ call the resolver. Since _bfinfdpic_assign_got_entries didn't
+ account for them, our block size is 4 bytes smaller than the real
+ block size. */
+ if (elf_hash_table (info)->dynamic_sections_created)
+ {
+ bfinfdpic_plt_section (info)->size = gpinfo.g.lzplt
+ + ((gpinfo.g.lzplt + (BFINFDPIC_LZPLT_BLOCK_SIZE - 4) - LZPLT_NORMAL_SIZE)
+ / (BFINFDPIC_LZPLT_BLOCK_SIZE - 4) * LZPLT_RESOLVER_EXTRA);
+ }
+
+ /* Reset it, such that _bfinfdpic_assign_plt_entries() can use it to
+ actually assign lazy PLT entries addresses. */
+ gpinfo.g.lzplt = 0;
+
+ /* Save information that we're going to need to generate GOT and PLT
+ entries. */
+ bfinfdpic_got_initial_offset (info) = -gpinfo.gothilo.min;
+
+ if (get_elf_backend_data (output_bfd)->want_got_sym)
+ elf_hash_table (info)->hgot->root.u.def.value
+ += bfinfdpic_got_initial_offset (info);
+
+ if (elf_hash_table (info)->dynamic_sections_created)
+ bfinfdpic_plt_initial_offset (info) =
+ bfinfdpic_plt_section (info)->size;
+
+ htab_traverse (bfinfdpic_relocs_info (info), _bfinfdpic_assign_plt_entries,
+ &gpinfo);
+
+ /* Allocate the PLT section contents only after
+ _bfinfdpic_assign_plt_entries has a chance to add the size of the
+ non-lazy PLT entries. */
+ if (elf_hash_table (info)->dynamic_sections_created)
+ {
+ if (bfinfdpic_plt_section (info)->size == 0)
+ bfinfdpic_plt_section (info)->flags |= SEC_EXCLUDE;
+ else
+ {
+ bfinfdpic_plt_section (info)->contents =
+ (bfd_byte *) bfd_zalloc (dynobj,
+ bfinfdpic_plt_section (info)->size);
+ if (bfinfdpic_plt_section (info)->contents == NULL)
+ return FALSE;
+ }
+ }
+
+ if (elf_hash_table (info)->dynamic_sections_created)
+ {
+ if (bfinfdpic_got_section (info)->size)
+ if (!_bfd_elf_add_dynamic_entry (info, DT_PLTGOT, 0))
+ return FALSE;
+
+ if (bfinfdpic_pltrel_section (info)->size)
+ if (!_bfd_elf_add_dynamic_entry (info, DT_PLTRELSZ, 0)
+ || !_bfd_elf_add_dynamic_entry (info, DT_PLTREL, DT_REL)
+ || !_bfd_elf_add_dynamic_entry (info, DT_JMPREL, 0))
+ return FALSE;
+
+ if (bfinfdpic_gotrel_section (info)->size)
+ if (!_bfd_elf_add_dynamic_entry (info, DT_REL, 0)
+ || !_bfd_elf_add_dynamic_entry (info, DT_RELSZ, 0)
+ || !_bfd_elf_add_dynamic_entry (info, DT_RELENT,
+ sizeof (Elf32_External_Rel)))
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+static bfd_boolean
+elf32_bfinfdpic_always_size_sections (bfd *output_bfd,
+ struct bfd_link_info *info)
+{
+ if (!info->relocatable)
+ {
+ struct elf_link_hash_entry *h;
+ asection *sec;
+
+ /* Force a PT_GNU_STACK segment to be created. */
+ if (! elf_tdata (output_bfd)->stack_flags)
+ elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X;
+
+ /* Define __stacksize if it's not defined yet. */
+ h = elf_link_hash_lookup (elf_hash_table (info), "__stacksize",
+ FALSE, FALSE, FALSE);
+ if (! h || h->root.type != bfd_link_hash_defined
+ || h->type != STT_OBJECT
+ || !h->def_regular)
+ {
+ struct bfd_link_hash_entry *bh = NULL;
+
+ if (!(_bfd_generic_link_add_one_symbol
+ (info, output_bfd, "__stacksize",
+ BSF_GLOBAL, bfd_abs_section_ptr, DEFAULT_STACK_SIZE,
+ (const char *) NULL, FALSE,
+ get_elf_backend_data (output_bfd)->collect, &bh)))
+ return FALSE;
+
+ h = (struct elf_link_hash_entry *) bh;
+ h->def_regular = 1;
+ h->type = STT_OBJECT;
+ }
+
+ /* Create a stack section, and set its alignment. */
+ sec = bfd_make_section (output_bfd, ".stack");
+
+ if (sec == NULL
+ || ! bfd_set_section_alignment (output_bfd, sec, 3))
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+static bfd_boolean
+elf32_bfinfdpic_modify_segment_map (bfd *output_bfd,
+ struct bfd_link_info *info)
+{
+ struct elf_segment_map *m;
+
+ /* objcopy and strip preserve what's already there using
+ elf32_bfinfdpic_copy_private_bfd_data (). */
+ if (! info)
+ return TRUE;
+
+ for (m = elf_tdata (output_bfd)->segment_map; m != NULL; m = m->next)
+ if (m->p_type == PT_GNU_STACK)
+ break;
+
+ if (m)
+ {
+ asection *sec = bfd_get_section_by_name (output_bfd, ".stack");
+ struct elf_link_hash_entry *h;
+
+ if (sec)
+ {
+ /* Obtain the pointer to the __stacksize symbol. */
+ h = elf_link_hash_lookup (elf_hash_table (info), "__stacksize",
+ FALSE, FALSE, FALSE);
+ while (h->root.type == bfd_link_hash_indirect
+ || h->root.type == bfd_link_hash_warning)
+ h = (struct elf_link_hash_entry *)h->root.u.i.link;
+ BFD_ASSERT (h->root.type == bfd_link_hash_defined);
+
+ /* Set the section size from the symbol value. We
+ intentionally ignore the symbol section. */
+ if (h->root.type == bfd_link_hash_defined)
+ sec->size = h->root.u.def.value;
else
+ sec->size = DEFAULT_STACK_SIZE;
+
+ /* Add the stack section to the PT_GNU_STACK segment,
+ such that its size and alignment requirements make it
+ to the segment. */
+ m->sections[m->count] = sec;
+ m->count++;
+ }
+ }
+
+ return TRUE;
+}
+
+static bfd_boolean
+elf32_bfinfdpic_finish_dynamic_sections (bfd *output_bfd,
+ struct bfd_link_info *info)
+{
+ bfd *dynobj;
+ asection *sdyn;
+
+ dynobj = elf_hash_table (info)->dynobj;
+
+ if (bfinfdpic_got_section (info))
+ {
+ BFD_ASSERT (bfinfdpic_gotrel_section (info)->size
+ == (bfinfdpic_gotrel_section (info)->reloc_count
+ * sizeof (Elf32_External_Rel)));
+
+ if (bfinfdpic_gotfixup_section (info))
+ {
+ struct elf_link_hash_entry *hgot = elf_hash_table (info)->hgot;
+ bfd_vma got_value = hgot->root.u.def.value
+ + hgot->root.u.def.section->output_section->vma
+ + hgot->root.u.def.section->output_offset;
+
+ _bfinfdpic_add_rofixup (output_bfd, bfinfdpic_gotfixup_section (info),
+ got_value, 0);
+
+ if (bfinfdpic_gotfixup_section (info)->size
+ != (bfinfdpic_gotfixup_section (info)->reloc_count * 4))
{
(*_bfd_error_handler)
- (_("%B(%A+0x%lx): reloc against `%s': error %d"),
- input_bfd, input_section,
- (long) rel->r_offset, name, (int) r);
+ ("LINKER BUG: .rofixup section size mismatch");
return FALSE;
}
}
}
+ if (elf_hash_table (info)->dynamic_sections_created)
+ {
+ BFD_ASSERT (bfinfdpic_pltrel_section (info)->size
+ == (bfinfdpic_pltrel_section (info)->reloc_count
+ * sizeof (Elf32_External_Rel)));
+ }
+
+ sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
+
+ if (elf_hash_table (info)->dynamic_sections_created)
+ {
+ Elf32_External_Dyn * dyncon;
+ Elf32_External_Dyn * dynconend;
+
+ BFD_ASSERT (sdyn != NULL);
+
+ dyncon = (Elf32_External_Dyn *) sdyn->contents;
+ dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
+
+ for (; dyncon < dynconend; dyncon++)
+ {
+ Elf_Internal_Dyn dyn;
+
+ bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
+
+ switch (dyn.d_tag)
+ {
+ default:
+ break;
+
+ case DT_PLTGOT:
+ dyn.d_un.d_ptr = bfinfdpic_got_section (info)->output_section->vma
+ + bfinfdpic_got_section (info)->output_offset
+ + bfinfdpic_got_initial_offset (info);
+ bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
+ break;
+
+ case DT_JMPREL:
+ dyn.d_un.d_ptr = bfinfdpic_pltrel_section (info)
+ ->output_section->vma
+ + bfinfdpic_pltrel_section (info)->output_offset;
+ bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
+ break;
+
+ case DT_PLTRELSZ:
+ dyn.d_un.d_val = bfinfdpic_pltrel_section (info)->size;
+ bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
+ break;
+ }
+ }
+ }
+
+ return TRUE;
+}
+
+/* Adjust a symbol defined by a dynamic object and referenced by a
+ regular object. */
+
+static bfd_boolean
+elf32_bfinfdpic_adjust_dynamic_symbol
+(struct bfd_link_info *info ATTRIBUTE_UNUSED,
+ struct elf_link_hash_entry *h ATTRIBUTE_UNUSED)
+{
+ bfd * dynobj;
+
+ dynobj = elf_hash_table (info)->dynobj;
+
+ /* Make sure we know what is going on here. */
+ BFD_ASSERT (dynobj != NULL
+ && (h->u.weakdef != NULL
+ || (h->def_dynamic
+ && h->ref_regular
+ && !h->def_regular)));
+
+ /* 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->u.weakdef != NULL)
+ {
+ BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
+ || h->u.weakdef->root.type == bfd_link_hash_defweak);
+ h->root.u.def.section = h->u.weakdef->root.u.def.section;
+ h->root.u.def.value = h->u.weakdef->root.u.def.value;
+ }
return TRUE;
}
-static asection *
-bfin_gc_mark_hook (asection * sec,
- struct bfd_link_info *info ATTRIBUTE_UNUSED,
- Elf_Internal_Rela * rel,
- struct elf_link_hash_entry *h,
- Elf_Internal_Sym * sym)
+/* Perform any actions needed for dynamic symbols. */
+
+static bfd_boolean
+elf32_bfinfdpic_finish_dynamic_symbol
+(bfd *output_bfd ATTRIBUTE_UNUSED,
+ struct bfd_link_info *info ATTRIBUTE_UNUSED,
+ struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
+ Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
{
- if (h != NULL)
- {
- switch (ELF32_R_TYPE (rel->r_info))
- {
+ return TRUE;
+}
- case R_BFIN_GNU_VTINHERIT:
- case R_BFIN_GNU_VTENTRY:
- break;
+/* Decide whether to attempt to turn absptr or lsda encodings in
+ shared libraries into pcrel within the given input section. */
- default:
- switch (h->root.type)
- {
- default:
- break;
+static bfd_boolean
+bfinfdpic_elf_use_relative_eh_frame
+(bfd *input_bfd ATTRIBUTE_UNUSED,
+ struct bfd_link_info *info ATTRIBUTE_UNUSED,
+ asection *eh_frame_section ATTRIBUTE_UNUSED)
+{
+ /* We can't use PC-relative encodings in FDPIC binaries, in general. */
+ return FALSE;
+}
- case bfd_link_hash_defined:
- case bfd_link_hash_defweak:
- return h->root.u.def.section;
+/* Adjust the contents of an eh_frame_hdr section before they're output. */
- case bfd_link_hash_common:
- return h->root.u.c.p->section;
- }
- }
- }
- else
- return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
+static bfd_byte
+bfinfdpic_elf_encode_eh_address (bfd *abfd,
+ struct bfd_link_info *info,
+ asection *osec, bfd_vma offset,
+ asection *loc_sec, bfd_vma loc_offset,
+ bfd_vma *encoded)
+{
+ struct elf_link_hash_entry *h;
- return NULL;
+ h = elf_hash_table (info)->hgot;
+ BFD_ASSERT (h && h->root.type == bfd_link_hash_defined);
+
+ if (! h || (_bfinfdpic_osec_to_segment (abfd, osec)
+ == _bfinfdpic_osec_to_segment (abfd, loc_sec->output_section)))
+ return _bfd_elf_encode_eh_address (abfd, info, osec, offset,
+ loc_sec, loc_offset, encoded);
+
+ BFD_ASSERT (_bfinfdpic_osec_to_segment (abfd, osec)
+ == (_bfinfdpic_osec_to_segment
+ (abfd, h->root.u.def.section->output_section)));
+
+ *encoded = osec->vma + offset
+ - (h->root.u.def.value
+ + h->root.u.def.section->output_section->vma
+ + h->root.u.def.section->output_offset);
+
+ return DW_EH_PE_datarel | DW_EH_PE_sdata4;
}
-/* Update the got entry reference counts for the section being removed. */
+
+/* Look through the relocs for a section during the first phase.
+
+ Besides handling virtual table relocs for gc, we have to deal with
+ all sorts of PIC-related relocations. We describe below the
+ general plan on how to handle such relocations, even though we only
+ collect information at this point, storing them in hash tables for
+ perusal of later passes.
+
+ 32 relocations are propagated to the linker output when creating
+ position-independent output. LO16 and HI16 relocations are not
+ supposed to be encountered in this case.
+
+ LABEL16 should always be resolvable by the linker, since it's only
+ used by branches.
+
+ LABEL24, on the other hand, is used by calls. If it turns out that
+ the target of a call is a dynamic symbol, a PLT entry must be
+ created for it, which triggers the creation of a private function
+ descriptor and, unless lazy binding is disabled, a lazy PLT entry.
+
+ GPREL relocations require the referenced symbol to be in the same
+ segment as _gp, but this can only be checked later.
+
+ All GOT, GOTOFF and FUNCDESC relocations require a .got section to
+ exist. LABEL24 might as well, since it may require a PLT entry,
+ that will require a got.
+
+ Non-FUNCDESC GOT relocations require a GOT entry to be created
+ regardless of whether the symbol is dynamic. However, since a
+ global symbol that turns out to not be exported may have the same
+ address of a non-dynamic symbol, we don't assign GOT entries at
+ this point, such that we can share them in this case. A relocation
+ for the GOT entry always has to be created, be it to offset a
+ private symbol by the section load address, be it to get the symbol
+ resolved dynamically.
+
+ FUNCDESC GOT relocations require a GOT entry to be created, and
+ handled as if a FUNCDESC relocation was applied to the GOT entry in
+ an object file.
+
+ FUNCDESC relocations referencing a symbol that turns out to NOT be
+ dynamic cause a private function descriptor to be created. The
+ FUNCDESC relocation then decays to a 32 relocation that points at
+ the private descriptor. If the symbol is dynamic, the FUNCDESC
+ relocation is propagated to the linker output, such that the
+ dynamic linker creates the canonical descriptor, pointing to the
+ dynamically-resolved definition of the function.
+
+ Non-FUNCDESC GOTOFF relocations must always refer to non-dynamic
+ symbols that are assigned to the same segment as the GOT, but we
+ can only check this later, after we know the complete set of
+ symbols defined and/or exported.
+
+ FUNCDESC GOTOFF relocations require a function descriptor to be
+ created and, unless lazy binding is disabled or the symbol is not
+ dynamic, a lazy PLT entry. Since we can't tell at this point
+ whether a symbol is going to be dynamic, we have to decide later
+ whether to create a lazy PLT entry or bind the descriptor directly
+ to the private function.
+
+ FUNCDESC_VALUE relocations are not supposed to be present in object
+ files, but they may very well be simply propagated to the linker
+ output, since they have no side effect.
+
+
+ A function descriptor always requires a FUNCDESC_VALUE relocation.
+ Whether it's in .plt.rel or not depends on whether lazy binding is
+ enabled and on whether the referenced symbol is dynamic.
+
+ The existence of a lazy PLT requires the resolverStub lazy PLT
+ entry to be present.
+
+
+ As for assignment of GOT, PLT and lazy PLT entries, and private
+ descriptors, we might do them all sequentially, but we can do
+ better than that. For example, we can place GOT entries and
+ private function descriptors referenced using 12-bit operands
+ closer to the PIC register value, such that these relocations don't
+ overflow. Those that are only referenced with LO16 relocations
+ could come next, but we may as well place PLT-required function
+ descriptors in the 12-bit range to make them shorter. Symbols
+ referenced with LO16/HI16 may come next, but we may place
+ additional function descriptors in the 16-bit range if we can
+ reliably tell that we've already placed entries that are ever
+ referenced with only LO16. PLT entries are therefore generated as
+ small as possible, while not introducing relocation overflows in
+ GOT or FUNCDESC_GOTOFF relocations. Lazy PLT entries could be
+ generated before or after PLT entries, but not intermingled with
+ them, such that we can have more lazy PLT entries in range for a
+ branch to the resolverStub. The resolverStub should be emitted at
+ the most distant location from the first lazy PLT entry such that
+ it's still in range for a branch, or closer, if there isn't a need
+ for so many lazy PLT entries. Additional lazy PLT entries may be
+ emitted after the resolverStub, as long as branches are still in
+ range. If the branch goes out of range, longer lazy PLT entries
+ are emitted.
+
+ We could further optimize PLT and lazy PLT entries by giving them
+ priority in assignment to closer-to-gr17 locations depending on the
+ number of occurrences of references to them (assuming a function
+ that's called more often is more important for performance, so its
+ PLT entry should be faster), or taking hints from the compiler.
+ Given infinite time and money... :-) */
static bfd_boolean
-bfin_gc_sweep_hook (bfd * abfd,
- struct bfd_link_info *info,
- asection * sec,
- const Elf_Internal_Rela * relocs)
+bfinfdpic_check_relocs (bfd *abfd, struct bfd_link_info *info,
+ asection *sec, const Elf_Internal_Rela *relocs)
{
Elf_Internal_Shdr *symtab_hdr;
- struct elf_link_hash_entry **sym_hashes;
- bfd_signed_vma *local_got_refcounts;
- const Elf_Internal_Rela *rel, *relend;
+ struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
+ const Elf_Internal_Rela *rel;
+ const Elf_Internal_Rela *rel_end;
bfd *dynobj;
- asection *sgot;
- asection *srelgot;
+ struct bfinfdpic_relocs_info *picrel;
- dynobj = elf_hash_table (info)->dynobj;
- if (dynobj == NULL)
+ if (info->relocatable)
return TRUE;
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
sym_hashes = elf_sym_hashes (abfd);
- local_got_refcounts = elf_local_got_refcounts (abfd);
-
- sgot = bfd_get_section_by_name (dynobj, ".got");
- srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
+ sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym);
+ if (!elf_bad_symtab (abfd))
+ sym_hashes_end -= symtab_hdr->sh_info;
- relend = relocs + sec->reloc_count;
- for (rel = relocs; rel < relend; rel++)
+ dynobj = elf_hash_table (info)->dynobj;
+ rel_end = relocs + sec->reloc_count;
+ for (rel = relocs; rel < rel_end; rel++)
{
- unsigned long r_symndx;
struct elf_link_hash_entry *h;
+ unsigned long r_symndx;
+
+ r_symndx = ELF32_R_SYM (rel->r_info);
+ if (r_symndx < symtab_hdr->sh_info)
+ h = NULL;
+ else
+ h = sym_hashes[r_symndx - symtab_hdr->sh_info];
switch (ELF32_R_TYPE (rel->r_info))
{
- case R_got:
- r_symndx = ELF32_R_SYM (rel->r_info);
- if (r_symndx >= symtab_hdr->sh_info)
+ case R_BFIN_GOT17M4:
+ case R_BFIN_GOTHI:
+ case R_BFIN_GOTLO:
+ case R_BFIN_FUNCDESC_GOT17M4:
+ case R_BFIN_FUNCDESC_GOTHI:
+ case R_BFIN_FUNCDESC_GOTLO:
+ case R_BFIN_GOTOFF17M4:
+ case R_BFIN_GOTOFFHI:
+ case R_BFIN_GOTOFFLO:
+ case R_BFIN_FUNCDESC_GOTOFF17M4:
+ case R_BFIN_FUNCDESC_GOTOFFHI:
+ case R_BFIN_FUNCDESC_GOTOFFLO:
+ case R_BFIN_FUNCDESC:
+ case R_BFIN_FUNCDESC_VALUE:
+ if (! IS_FDPIC (abfd))
+ goto bad_reloc;
+ /* Fall through. */
+ case R_pcrel24:
+ case R_pcrel24_jump_l:
+ case R_byte4_data:
+ if (IS_FDPIC (abfd) && ! dynobj)
{
- h = sym_hashes[r_symndx - symtab_hdr->sh_info];
- if (h->got.refcount > 0)
- {
- --h->got.refcount;
- if (h->got.refcount == 0)
- {
- /* We don't need the .got entry any more. */
- sgot->size -= 4;
- srelgot->size -= sizeof (Elf32_External_Rela);
- }
- }
+ elf_hash_table (info)->dynobj = dynobj = abfd;
+ if (! _bfin_create_got_section (abfd, info))
+ return FALSE;
}
- else if (local_got_refcounts != NULL)
+ if (! IS_FDPIC (abfd))
{
- if (local_got_refcounts[r_symndx] > 0)
- {
- --local_got_refcounts[r_symndx];
- if (local_got_refcounts[r_symndx] == 0)
- {
- /* We don't need the .got entry any more. */
- sgot->size -= 4;
- if (info->shared)
- srelgot->size -= sizeof (Elf32_External_Rela);
- }
- }
+ picrel = NULL;
+ break;
+ }
+ if (h != NULL)
+ {
+ if (h->dynindx == -1)
+ switch (ELF_ST_VISIBILITY (h->other))
+ {
+ case STV_INTERNAL:
+ case STV_HIDDEN:
+ break;
+ default:
+ bfd_elf_link_record_dynamic_symbol (info, h);
+ break;
+ }
+ picrel
+ = bfinfdpic_relocs_info_for_global (bfinfdpic_relocs_info (info),
+ abfd, h,
+ rel->r_addend, INSERT);
}
+ else
+ picrel = bfinfdpic_relocs_info_for_local (bfinfdpic_relocs_info
+ (info), abfd, r_symndx,
+ rel->r_addend, INSERT);
+ if (! picrel)
+ return FALSE;
break;
+
default:
+ picrel = NULL;
break;
}
+
+ switch (ELF32_R_TYPE (rel->r_info))
+ {
+ case R_pcrel24:
+ case R_pcrel24_jump_l:
+ if (IS_FDPIC (abfd))
+ picrel->call = 1;
+ break;
+
+ case R_BFIN_FUNCDESC_VALUE:
+ picrel->relocsfdv++;
+ if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
+ picrel->relocs32--;
+ /* Fall through. */
+
+ case R_byte4_data:
+ if (! IS_FDPIC (abfd))
+ break;
+
+ picrel->sym = 1;
+ if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
+ picrel->relocs32++;
+ break;
+
+ case R_BFIN_GOT17M4:
+ picrel->got17m4 = 1;
+ break;
+
+ case R_BFIN_GOTHI:
+ case R_BFIN_GOTLO:
+ picrel->gothilo = 1;
+ break;
+
+ case R_BFIN_FUNCDESC_GOT17M4:
+ picrel->fdgot17m4 = 1;
+ break;
+
+ case R_BFIN_FUNCDESC_GOTHI:
+ case R_BFIN_FUNCDESC_GOTLO:
+ picrel->fdgothilo = 1;
+ break;
+
+ case R_BFIN_GOTOFF17M4:
+ case R_BFIN_GOTOFFHI:
+ case R_BFIN_GOTOFFLO:
+ picrel->gotoff = 1;
+ break;
+
+ case R_BFIN_FUNCDESC_GOTOFF17M4:
+ picrel->fdgoff17m4 = 1;
+ break;
+
+ case R_BFIN_FUNCDESC_GOTOFFHI:
+ case R_BFIN_FUNCDESC_GOTOFFLO:
+ picrel->fdgoffhilo = 1;
+ break;
+
+ case R_BFIN_FUNCDESC:
+ picrel->fd = 1;
+ picrel->relocsfd++;
+ break;
+
+ /* This relocation describes the C++ object vtable hierarchy.
+ Reconstruct it for later use during GC. */
+ case R_BFIN_GNU_VTINHERIT:
+ if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
+ return FALSE;
+ break;
+
+ /* This relocation describes which C++ vtable entries are actually
+ used. Record for later use during GC. */
+ case R_BFIN_GNU_VTENTRY:
+ if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
+ return FALSE;
+ break;
+
+ case R_huimm16:
+ case R_luimm16:
+ case R_pcrel12_jump_s:
+ case R_pcrel10:
+ break;
+
+ default:
+ bad_reloc:
+ (*_bfd_error_handler)
+ (_("%B: unsupported relocation type %i"),
+ abfd, ELF32_R_TYPE (rel->r_info));
+ return FALSE;
+ }
}
return TRUE;
}
+/* Set the right machine number for a Blackfin ELF file. */
+
+static bfd_boolean
+elf32_bfin_object_p (bfd *abfd)
+{
+ bfd_default_set_arch_mach (abfd, bfd_arch_bfin, 0);
+ return (((elf_elfheader (abfd)->e_flags & EF_BFIN_FDPIC) != 0)
+ == (IS_FDPIC (abfd)));
+}
-/* Merge backend specific data from an object file to the output
- object file when linking. */
static bfd_boolean
-elf32_bfin_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
+elf32_bfin_set_private_flags (bfd * abfd, flagword flags)
{
- flagword out_flags;
- flagword in_flags;
+ elf_elfheader (abfd)->e_flags = flags;
+ elf_flags_init (abfd) = TRUE;
+ return TRUE;
+}
+/* Copy backend specific data from one object module to another. */
+
+static bfd_boolean
+bfin_elf_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
+{
if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
|| bfd_get_flavour (obfd) != bfd_target_elf_flavour)
return TRUE;
- in_flags = elf_elfheader (ibfd)->e_flags;
- out_flags = elf_elfheader (obfd)->e_flags;
-
- if (!elf_flags_init (obfd))
- {
- elf_flags_init (obfd) = TRUE;
- elf_elfheader (obfd)->e_flags = in_flags;
- }
+ BFD_ASSERT (!elf_flags_init (obfd)
+ || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags);
+ elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags;
+ elf_flags_init (obfd) = TRUE;
return TRUE;
}
-
static bfd_boolean
-elf32_bfin_set_private_flags (bfd * abfd, flagword flags)
+elf32_bfinfdpic_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
{
- elf_elfheader (abfd)->e_flags = flags;
- elf_flags_init (abfd) = TRUE;
+ unsigned i;
+
+ if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
+ || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
+ return TRUE;
+
+ if (! bfin_elf_copy_private_bfd_data (ibfd, obfd))
+ return FALSE;
+
+ if (! elf_tdata (ibfd) || ! elf_tdata (ibfd)->phdr
+ || ! elf_tdata (obfd) || ! elf_tdata (obfd)->phdr)
+ return TRUE;
+
+ /* Copy the stack size. */
+ for (i = 0; i < elf_elfheader (ibfd)->e_phnum; i++)
+ if (elf_tdata (ibfd)->phdr[i].p_type == PT_GNU_STACK)
+ {
+ Elf_Internal_Phdr *iphdr = &elf_tdata (ibfd)->phdr[i];
+
+ for (i = 0; i < elf_elfheader (obfd)->e_phnum; i++)
+ if (elf_tdata (obfd)->phdr[i].p_type == PT_GNU_STACK)
+ {
+ memcpy (&elf_tdata (obfd)->phdr[i], iphdr, sizeof (*iphdr));
+
+ /* Rewrite the phdrs, since we're only called after they
+ were first written. */
+ if (bfd_seek (obfd, (bfd_signed_vma) get_elf_backend_data (obfd)
+ ->s->sizeof_ehdr, SEEK_SET) != 0
+ || get_elf_backend_data (obfd)->s
+ ->write_out_phdrs (obfd, elf_tdata (obfd)->phdr,
+ elf_elfheader (obfd)->e_phnum) != 0)
+ return FALSE;
+ break;
+ }
+
+ break;
+ }
+
return TRUE;
}
elf32_bfin_print_private_bfd_data (bfd * abfd, PTR ptr)
{
FILE *file = (FILE *) ptr;
+ flagword flags;
BFD_ASSERT (abfd != NULL && ptr != NULL);
/* Print normal ELF private data. */
_bfd_elf_print_private_bfd_data (abfd, ptr);
- /* Ignore init flag - it may not be set, despite the flags field
- containing valid data. */
+ flags = elf_elfheader (abfd)->e_flags;
/* xgettext:c-format */
fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
+ if (flags & EF_BFIN_PIC)
+ fprintf (file, " -fpic");
+
+ if (flags & EF_BFIN_FDPIC)
+ fprintf (file, " -mfdpic");
+
fputc ('\n', file);
return TRUE;
}
+/* Merge backend specific data from an object file to the output
+ object file when linking. */
+
+static bfd_boolean
+elf32_bfin_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
+{
+ flagword old_flags, old_partial;
+ flagword new_flags, new_partial;
+ bfd_boolean error = FALSE;
+
+ new_flags = elf_elfheader (ibfd)->e_flags;
+ old_flags = elf_elfheader (obfd)->e_flags;
+
+ if (new_flags & EF_BFIN_FDPIC)
+ new_flags &= ~EF_BFIN_PIC;
+
+#ifdef DEBUG
+ (*_bfd_error_handler) ("old_flags = 0x%.8lx, new_flags = 0x%.8lx, init = %s, filename = %s",
+ old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no",
+ bfd_get_filename (ibfd));
+#endif
+
+ if (!elf_flags_init (obfd)) /* First call, no flags set. */
+ {
+ elf_flags_init (obfd) = TRUE;
+ old_flags = new_flags;
+ }
+
+ else if (new_flags == old_flags) /* Compatible flags are ok. */
+ ;
+
+ else /* Possibly incompatible flags. */
+ {
+ /* We don't have to do anything if the pic flags are the same, or the new
+ module(s) were compiled with -mlibrary-pic. */
+ new_partial = (new_flags & EF_BFIN_PIC_FLAGS);
+ old_partial = (old_flags & EF_BFIN_PIC_FLAGS);
+ if (new_partial == old_partial)
+ ;
+
+ /* If we have mixtures of -fpic and -fPIC, or in both bits. */
+ else if (new_partial != 0 && old_partial != 0)
+ old_flags |= new_partial;
+
+ /* One module was compiled for pic and the other was not, see if we have
+ had any relocations that are not pic-safe. */
+ else
+ old_flags |= new_partial;
+
+ }
+
+ /* Update the old flags now with changes made above. */
+ elf_elfheader (obfd)->e_flags = old_flags;
+
+ if (((new_flags & EF_BFIN_FDPIC) == 0)
+ != (! IS_FDPIC (ibfd)))
+ {
+ error = TRUE;
+ if (IS_FDPIC (obfd))
+ (*_bfd_error_handler)
+ (_("%s: cannot link non-fdpic object file into fdpic executable"),
+ bfd_get_filename (ibfd));
+ else
+ (*_bfd_error_handler)
+ (_("%s: cannot link fdpic object file into non-fdpic executable"),
+ bfd_get_filename (ibfd));
+ }
+
+ if (error)
+ bfd_set_error (bfd_error_bad_value);
+
+ return !error;
+}
+\f
/* bfin ELF linker hash entry. */
struct bfin_link_hash_entry
static struct bfd_hash_entry *
bfin_link_hash_newfunc (struct bfd_hash_entry *entry,
- struct bfd_hash_table *table, const char *string)
+ struct bfd_hash_table *table, const char *string)
{
struct bfd_hash_entry *ret = entry;
struct bfin_link_hash_table *ret;
bfd_size_type amt = sizeof (struct bfin_link_hash_table);
- ret = (struct bfin_link_hash_table *) bfd_malloc (amt);
- if (ret == (struct bfin_link_hash_table *) NULL)
+ ret = bfd_zalloc (abfd, amt);
+ if (ret == NULL)
return NULL;
if (!_bfd_elf_link_hash_table_init (&ret->root, abfd,
bfin_link_hash_newfunc,
- sizeof (struct bfin_link_hash_entry)))
+ sizeof (struct elf_link_hash_entry)))
{
free (ret);
return NULL;
return TRUE;
}
-/* Set the sizes of the dynamic sections. */
-#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
-
static bfd_boolean
bfin_size_dynamic_sections (bfd * output_bfd ATTRIBUTE_UNUSED,
struct bfd_link_info *info)
return TRUE;
}
-
+\f
/* Given a .data section and a .emreloc in-memory section, store
relocation information into the .emreloc section which can be
used at runtime to relocate the section. This is called by the
free (internal_relocs);
return FALSE;
}
-
+\f
#define TARGET_LITTLE_SYM bfd_elf32_bfin_vec
#define TARGET_LITTLE_NAME "elf32-bfin"
#define ELF_ARCH bfd_arch_bfin
#define bfd_elf32_bfd_reloc_type_lookup bfin_bfd_reloc_type_lookup
#define elf_info_to_howto bfin_info_to_howto
#define elf_info_to_howto_rel 0
+#define elf_backend_object_p elf32_bfin_object_p
#define bfd_elf32_bfd_is_local_label_name \
bfin_is_local_label_name
bfin_link_hash_table_create
#define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link
-#define elf_backend_check_relocs bfin_check_relocs
+#define elf_backend_check_relocs bfin_check_relocs
#define elf_backend_adjust_dynamic_symbol \
bfin_adjust_dynamic_symbol
#define elf_backend_size_dynamic_sections \
#define elf_backend_got_header_size 12
#define elf_backend_rela_normal 1
+#include "elf32-target.h"
+
+#undef TARGET_LITTLE_SYM
+#define TARGET_LITTLE_SYM bfd_elf32_bfinfdpic_vec
+#undef TARGET_LITTLE_NAME
+#define TARGET_LITTLE_NAME "elf32-bfinfdpic"
+#undef elf32_bed
+#define elf32_bed elf32_bfinfdpic_bed
+
+#undef elf_backend_gc_sweep_hook
+#define elf_backend_gc_sweep_hook bfinfdpic_gc_sweep_hook
+
+#undef elf_backend_got_header_size
+#define elf_backend_got_header_size 0
+
+#undef elf_backend_relocate_section
+#define elf_backend_relocate_section bfinfdpic_relocate_section
+#undef elf_backend_check_relocs
+#define elf_backend_check_relocs bfinfdpic_check_relocs
+
+#undef bfd_elf32_bfd_link_hash_table_create
+#define bfd_elf32_bfd_link_hash_table_create \
+ bfinfdpic_elf_link_hash_table_create
+#undef elf_backend_always_size_sections
+#define elf_backend_always_size_sections \
+ elf32_bfinfdpic_always_size_sections
+#undef elf_backend_modify_segment_map
+#define elf_backend_modify_segment_map \
+ elf32_bfinfdpic_modify_segment_map
+#undef bfd_elf32_bfd_copy_private_bfd_data
+#define bfd_elf32_bfd_copy_private_bfd_data \
+ elf32_bfinfdpic_copy_private_bfd_data
+
+#undef elf_backend_create_dynamic_sections
+#define elf_backend_create_dynamic_sections \
+ elf32_bfinfdpic_create_dynamic_sections
+#undef elf_backend_adjust_dynamic_symbol
+#define elf_backend_adjust_dynamic_symbol \
+ elf32_bfinfdpic_adjust_dynamic_symbol
+#undef elf_backend_size_dynamic_sections
+#define elf_backend_size_dynamic_sections \
+ elf32_bfinfdpic_size_dynamic_sections
+#undef elf_backend_finish_dynamic_symbol
+#define elf_backend_finish_dynamic_symbol \
+ elf32_bfinfdpic_finish_dynamic_symbol
+#undef elf_backend_finish_dynamic_sections
+#define elf_backend_finish_dynamic_sections \
+ elf32_bfinfdpic_finish_dynamic_sections
+
+#undef elf_backend_can_make_relative_eh_frame
+#define elf_backend_can_make_relative_eh_frame \
+ bfinfdpic_elf_use_relative_eh_frame
+#undef elf_backend_can_make_lsda_relative_eh_frame
+#define elf_backend_can_make_lsda_relative_eh_frame \
+ bfinfdpic_elf_use_relative_eh_frame
+#undef elf_backend_encode_eh_address
+#define elf_backend_encode_eh_address \
+ bfinfdpic_elf_encode_eh_address
+
+#undef elf_backend_may_use_rel_p
+#define elf_backend_may_use_rel_p 1
+#undef elf_backend_may_use_rela_p
+#define elf_backend_may_use_rela_p 1
+/* We use REL for dynamic relocations only. */
+#undef elf_backend_default_use_rela_p
+#define elf_backend_default_use_rela_p 1
+
+#undef elf_backend_omit_section_dynsym
+#define elf_backend_omit_section_dynsym _bfinfdpic_link_omit_section_dynsym
#include "elf32-target.h"
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