/* BFD back-end for National Semiconductor's CR16 ELF
- Copyright 2007 Free Software Foundation, Inc.
+ Copyright 2007, 2008, 2009 Free Software Foundation, Inc.
Written by M R Swami Reddy.
This file is part of BFD, the Binary File Descriptor library.
#include "elf-bfd.h"
#include "elf/cr16.h"
+/* The cr16 linker needs to keep track of the number of relocs that
+ it decides to copy in check_relocs for each symbol. This is so
+ that it can discard PC relative relocs if it doesn't need them when
+ linking with -Bsymbolic. We store the information in a field
+ extending the regular ELF linker hash table. */
+
+struct elf32_cr16_link_hash_entry {
+ /* The basic elf link hash table entry. */
+ struct elf_link_hash_entry root;
+
+ /* For function symbols, the number of times this function is
+ called directly (ie by name). */
+ unsigned int direct_calls;
+
+ /* For function symbols, the size of this function's stack
+ (if <= 255 bytes). We stuff this into "call" instructions
+ to this target when it's valid and profitable to do so.
+
+ This does not include stack allocated by movm! */
+ unsigned char stack_size;
+
+ /* For function symbols, arguments (if any) for movm instruction
+ in the prologue. We stuff this value into "call" instructions
+ to the target when it's valid and profitable to do so. */
+ unsigned char movm_args;
+
+ /* For function symbols, the amount of stack space that would be allocated
+ by the movm instruction. This is redundant with movm_args, but we
+ add it to the hash table to avoid computing it over and over. */
+ unsigned char movm_stack_size;
+
+/* Used to mark functions which have had redundant parts of their
+ prologue deleted. */
+#define CR16_DELETED_PROLOGUE_BYTES 0x1
+ unsigned char flags;
+
+ /* Calculated value. */
+ bfd_vma value;
+};
+
+/* We derive a hash table from the main elf linker hash table so
+ we can store state variables and a secondary hash table without
+ resorting to global variables. */
+struct elf32_cr16_link_hash_table {
+ /* The main hash table. */
+ struct elf_link_hash_table root;
+
+ /* A hash table for static functions. We could derive a new hash table
+ instead of using the full elf32_cr16_link_hash_table if we wanted
+ to save some memory. */
+ struct elf32_cr16_link_hash_table *static_hash_table;
+
+ /* Random linker state flags. */
+#define CR16_HASH_ENTRIES_INITIALIZED 0x1
+ char flags;
+};
+
+/* For CR16 linker hash table. */
+
+/* Get the CR16 ELF linker hash table from a link_info structure. */
+
+#define elf32_cr16_hash_table(p) \
+ ((struct elf32_cr16_link_hash_table *) ((p)->hash))
+
+#define elf32_cr16_link_hash_traverse(table, func, info) \
+ (elf_link_hash_traverse \
+ (&(table)->root, \
+ (bfd_boolean (*) ((struct elf_link_hash_entry *, void *))) (func), (info)))
+
/* cr16_reloc_map array maps BFD relocation enum into a CRGAS relocation type. */
struct cr16_reloc_map
{BFD_RELOC_CR16_DISP8, R_CR16_DISP8},
{BFD_RELOC_CR16_DISP16, R_CR16_DISP16},
{BFD_RELOC_CR16_DISP24, R_CR16_DISP24},
- {BFD_RELOC_CR16_DISP24a, R_CR16_DISP24a}
+ {BFD_RELOC_CR16_DISP24a, R_CR16_DISP24a},
+ {BFD_RELOC_CR16_SWITCH8, R_CR16_SWITCH8},
+ {BFD_RELOC_CR16_SWITCH16, R_CR16_SWITCH16},
+ {BFD_RELOC_CR16_SWITCH32, R_CR16_SWITCH32},
+ {BFD_RELOC_CR16_GOT_REGREL20, R_CR16_GOT_REGREL20},
+ {BFD_RELOC_CR16_GOTC_REGREL20, R_CR16_GOTC_REGREL20},
+ {BFD_RELOC_CR16_GLOB_DAT, R_CR16_GLOB_DAT}
};
static reloc_howto_type cr16_elf_howto_table[] =
bfd_elf_generic_reloc, /* special_function */
"R_CR16_NUM8", /* name */
FALSE, /* partial_inplace */
- 0xff, /* src_mask */
+ 0x0, /* src_mask */
0xff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_NUM16", /* name */
FALSE, /* partial_inplace */
- 0xffff, /* src_mask */
+ 0x0, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_NUM32", /* name */
FALSE, /* partial_inplace */
- 0xffffffff, /* src_mask */
+ 0x0, /* src_mask */
0xffffffff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_NUM32a", /* name */
FALSE, /* partial_inplace */
- 0xffffffff, /* src_mask */
+ 0x0, /* src_mask */
0xffffffff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_REGREL4", /* name */
FALSE, /* partial_inplace */
- 0xf, /* src_mask */
+ 0x0, /* src_mask */
0xf, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_REGREL4a", /* name */
FALSE, /* partial_inplace */
- 0xf, /* src_mask */
+ 0x0, /* src_mask */
0xf, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_REGREL14", /* name */
FALSE, /* partial_inplace */
- 0x3fff, /* src_mask */
+ 0x0, /* src_mask */
0x3fff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_REGREL14a", /* name */
FALSE, /* partial_inplace */
- 0x3fff, /* src_mask */
+ 0x0, /* src_mask */
0x3fff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_REGREL16", /* name */
FALSE, /* partial_inplace */
- 0xffff, /* src_mask */
+ 0x0, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_REGREL20", /* name */
FALSE, /* partial_inplace */
- 0xfffff, /* src_mask */
+ 0x0, /* src_mask */
0xfffff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_REGREL20a", /* name */
FALSE, /* partial_inplace */
- 0xfffff, /* src_mask */
+ 0x0, /* src_mask */
0xfffff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_ABS20", /* name */
FALSE, /* partial_inplace */
- 0xfffff, /* src_mask */
+ 0x0, /* src_mask */
0xfffff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_ABS24", /* name */
FALSE, /* partial_inplace */
- 0xffffff, /* src_mask */
+ 0x0, /* src_mask */
0xffffff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_IMM4", /* name */
FALSE, /* partial_inplace */
- 0xf, /* src_mask */
+ 0x0, /* src_mask */
0xf, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_IMM8", /* name */
FALSE, /* partial_inplace */
- 0xff, /* src_mask */
+ 0x0, /* src_mask */
0xff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_IMM16", /* name */
FALSE, /* partial_inplace */
- 0xffff, /* src_mask */
+ 0x0, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_IMM20", /* name */
FALSE, /* partial_inplace */
- 0xfffff, /* src_mask */
+ 0x0, /* src_mask */
0xfffff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_IMM24", /* name */
FALSE, /* partial_inplace */
- 0xffffff, /* src_mask */
+ 0x0, /* src_mask */
0xffffff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_IMM32", /* name */
FALSE, /* partial_inplace */
- 0xffffffff, /* src_mask */
+ 0x0, /* src_mask */
0xffffffff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_IMM32a", /* name */
FALSE, /* partial_inplace */
- 0xffffffff, /* src_mask */
+ 0x0, /* src_mask */
0xffffffff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_DISP4", /* name */
FALSE, /* partial_inplace */
- 0xf, /* src_mask */
+ 0x0, /* src_mask */
0xf, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_DISP8", /* name */
FALSE, /* partial_inplace */
- 0x1ff, /* src_mask */
+ 0x0, /* src_mask */
0x1ff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_DISP16", /* name */
FALSE, /* partial_inplace */
- 0x1ffff, /* src_mask */
+ 0x0, /* src_mask */
0x1ffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* REVISIT: DISP24 should be left-shift by 2 as per ISA doc
bfd_elf_generic_reloc, /* special_function */
"R_CR16_DISP24", /* name */
FALSE, /* partial_inplace */
- 0x1ffffff, /* src_mask */
+ 0x0, /* src_mask */
0x1ffffff, /* dst_mask */
FALSE), /* pcrel_offset */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_DISP24a", /* name */
FALSE, /* partial_inplace */
- 0xffffff, /* src_mask */
+ 0x0, /* src_mask */
0xffffff, /* dst_mask */
- FALSE) /* pcrel_offset */
+ FALSE), /* pcrel_offset */
+
+ /* An 8 bit switch table entry. This is generated for an expression
+ such as ``.byte L1 - L2''. The offset holds the difference
+ between the reloc address and L2. */
+ HOWTO (R_CR16_SWITCH8, /* type */
+ 0, /* rightshift */
+ 0, /* size (0 = byte, 1 = short, 2 = long) */
+ 8, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_unsigned, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_CR16_SWITCH8", /* name */
+ FALSE, /* partial_inplace */
+ 0x0, /* src_mask */
+ 0xff, /* dst_mask */
+ TRUE), /* pcrel_offset */
+
+ /* A 16 bit switch table entry. This is generated for an expression
+ such as ``.word L1 - L2''. The offset holds the difference
+ between the reloc address and L2. */
+ HOWTO (R_CR16_SWITCH16, /* type */
+ 0, /* rightshift */
+ 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 16, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_unsigned, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_CR16_SWITCH16", /* name */
+ FALSE, /* partial_inplace */
+ 0x0, /* src_mask */
+ 0xffff, /* dst_mask */
+ TRUE), /* pcrel_offset */
+
+ /* A 32 bit switch table entry. This is generated for an expression
+ such as ``.long L1 - L2''. The offset holds the difference
+ between the reloc address and L2. */
+ HOWTO (R_CR16_SWITCH32, /* type */
+ 0, /* rightshift */
+ 2, /* size (0 = byte, 1 = short, 2 = long) */
+ 32, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_unsigned, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_CR16_SWITCH32", /* name */
+ FALSE, /* partial_inplace */
+ 0x0, /* src_mask */
+ 0xffffffff, /* dst_mask */
+ TRUE), /* pcrel_offset */
+
+ HOWTO (R_CR16_GOT_REGREL20, /* type */
+ 0, /* rightshift */
+ 2, /* size */
+ 20, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_bitfield,/* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_CR16_GOT_REGREL20", /* name */
+ TRUE, /* partial_inplace */
+ 0x0, /* src_mask */
+ 0xfffff, /* dst_mask */
+ FALSE), /* pcrel_offset */
+
+ HOWTO (R_CR16_GOTC_REGREL20, /* type */
+ 0, /* rightshift */
+ 2, /* size */
+ 20, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_bitfield,/* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_CR16_GOTC_REGREL20", /* name */
+ TRUE, /* partial_inplace */
+ 0x0, /* src_mask */
+ 0xfffff, /* dst_mask */
+ FALSE), /* pcrel_offset */
+
+ HOWTO (R_CR16_GLOB_DAT, /* type */
+ 0, /* rightshift */
+ 2, /* size (0 = byte, 1 = short, 2 = long) */
+ 32, /* bitsize */
+ FALSE, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_unsigned, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_CR16_GLOB_DAT", /* name */
+ FALSE, /* partial_inplace */
+ 0x0, /* src_mask */
+ 0xffffffff, /* dst_mask */
+ TRUE) /* pcrel_offset */
};
+
+/* Create the GOT section. */
+
+static bfd_boolean
+_bfd_cr16_elf_create_got_section (bfd * abfd, struct bfd_link_info * info)
+{
+ flagword flags;
+ asection * s;
+ struct elf_link_hash_entry * h;
+ const struct elf_backend_data * bed = get_elf_backend_data (abfd);
+ int ptralign;
+
+ /* This function may be called more than once. */
+ if (bfd_get_section_by_name (abfd, ".got") != NULL)
+ return TRUE;
+
+ switch (bed->s->arch_size)
+ {
+ case 16:
+ ptralign = 1;
+ break;
+
+ case 32:
+ ptralign = 2;
+ break;
+
+ default:
+ bfd_set_error (bfd_error_bad_value);
+ return FALSE;
+ }
+
+ flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
+ | SEC_LINKER_CREATED);
+
+ 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;
+ }
+
+ /* 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;
+
+ /* The first bit of the global offset table is the header. */
+ s->size += bed->got_header_size;
+
+ return TRUE;
+}
+
+
/* Retrieve a howto ptr using a BFD reloc_code. */
static reloc_howto_type *
unsigned int r_type = ELF32_R_TYPE (dst->r_info);
BFD_ASSERT (r_type < (unsigned int) R_CR16_MAX);
- cache_ptr->howto = &cr16_elf_howto_table[r_type];
+ cache_ptr->howto = cr16_elf_howto_table + r_type;
+}
+
+/* Look through the relocs for a section during the first phase.
+ Since we don't do .gots or .plts, we just need to consider the
+ virtual table relocs for gc. */
+
+static bfd_boolean
+cr16_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec,
+ const Elf_Internal_Rela *relocs)
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ Elf_Internal_Sym * isymbuf = NULL;
+ struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
+ const Elf_Internal_Rela *rel;
+ const Elf_Internal_Rela *rel_end;
+ bfd * dynobj;
+ bfd_vma * local_got_offsets;
+ asection * sgot;
+ asection * srelgot;
+
+ sgot = NULL;
+ srelgot = NULL;
+ bfd_boolean result = FALSE;
+
+ if (info->relocatable)
+ return TRUE;
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ sym_hashes = elf_sym_hashes (abfd);
+ 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;
+
+ dynobj = elf_hash_table (info)->dynobj;
+ local_got_offsets = elf_local_got_offsets (abfd);
+ rel_end = relocs + sec->reloc_count;
+ for (rel = relocs; rel < rel_end; rel++)
+ {
+ 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];
+ 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;
+ }
+
+ /* Some relocs require a global offset table. */
+ if (dynobj == NULL)
+ {
+ switch (ELF32_R_TYPE (rel->r_info))
+ {
+ case R_CR16_GOT_REGREL20:
+ case R_CR16_GOTC_REGREL20:
+ elf_hash_table (info)->dynobj = dynobj = abfd;
+ if (! _bfd_cr16_elf_create_got_section (dynobj, info))
+ goto fail;
+ break;
+
+ default:
+ break;
+ }
+ }
+
+ switch (ELF32_R_TYPE (rel->r_info))
+ {
+ case R_CR16_GOT_REGREL20:
+ case R_CR16_GOTC_REGREL20:
+ /* This symbol requires a global offset table entry. */
+
+ if (sgot == NULL)
+ {
+ sgot = bfd_get_section_by_name (dynobj, ".got");
+ BFD_ASSERT (sgot != NULL);
+ }
+
+ if (srelgot == NULL
+ && (h != NULL || info->executable))
+ {
+ srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
+ if (srelgot == NULL)
+ {
+ srelgot = bfd_make_section_with_flags (dynobj,
+ ".rela.got",
+ (SEC_ALLOC
+ | SEC_LOAD
+ | SEC_HAS_CONTENTS
+ | SEC_IN_MEMORY
+ | SEC_LINKER_CREATED
+ | SEC_READONLY));
+ if (srelgot == NULL
+ || ! bfd_set_section_alignment (dynobj, srelgot, 2))
+ goto fail;
+ }
+ }
+
+ if (h != NULL)
+ {
+ if (h->got.offset != (bfd_vma) -1)
+ /* We have already allocated space in the .got. */
+ break;
+
+ h->got.offset = sgot->size;
+
+ /* Make sure this symbol is output as a dynamic symbol. */
+ if (h->dynindx == -1)
+ {
+ if (! bfd_elf_link_record_dynamic_symbol (info, h))
+ goto fail;
+ }
+
+ srelgot->size += sizeof (Elf32_External_Rela);
+ }
+ else
+ {
+ /* This is a global offset table entry for a local
+ symbol. */
+ if (local_got_offsets == NULL)
+ {
+ size_t size;
+ unsigned int i;
+
+ size = symtab_hdr->sh_info * sizeof (bfd_vma);
+ local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size);
+
+ if (local_got_offsets == NULL)
+ goto fail;
+
+ elf_local_got_offsets (abfd) = local_got_offsets;
+
+ for (i = 0; i < symtab_hdr->sh_info; i++)
+ local_got_offsets[i] = (bfd_vma) -1;
+ }
+
+ if (local_got_offsets[r_symndx] != (bfd_vma) -1)
+ /* We have already allocated space in the .got. */
+ break;
+
+ local_got_offsets[r_symndx] = sgot->size;
+
+ if (info->executable)
+ /* If we are generating a shared object, we need to
+ output a R_CR16_RELATIVE reloc so that the dynamic
+ linker can adjust this GOT entry. */
+ srelgot->size += sizeof (Elf32_External_Rela);
+ }
+
+ sgot->size += 4;
+ break;
+
+ }
+ }
+
+ result = TRUE;
+ fail:
+ if (isymbuf != NULL)
+ free (isymbuf);
+
+ return result;
}
/* Perform a relocation as part of a final link. */
static bfd_reloc_status_type
cr16_elf_final_link_relocate (reloc_howto_type *howto,
- bfd *input_bfd,
+ bfd *input_bfd,
bfd *output_bfd ATTRIBUTE_UNUSED,
asection *input_section,
- bfd_byte *contents,
+ bfd_byte *contents,
bfd_vma offset,
- bfd_vma Rvalue,
- bfd_vma addend,
+ bfd_vma Rvalue,
+ bfd_vma addend,
+ struct elf_link_hash_entry * h,
+ unsigned long symndx ATTRIBUTE_UNUSED,
struct bfd_link_info *info ATTRIBUTE_UNUSED,
asection *sec ATTRIBUTE_UNUSED,
int is_local ATTRIBUTE_UNUSED)
bfd_byte *hit_data = contents + offset;
bfd_vma reloc_bits, check, Rvalue1;
+ bfd * dynobj;
+ bfd_vma * local_got_offsets;
+ asection * sgot;
+
+ dynobj = elf_hash_table (info)->dynobj;
+ local_got_offsets = elf_local_got_offsets (input_bfd);
+
+ sgot = NULL;
+
+
switch (r_type)
{
case R_CR16_IMM4:
+ case R_CR16_IMM20:
+ case R_CR16_ABS20:
+ break;
+
case R_CR16_IMM8:
case R_CR16_IMM16:
- case R_CR16_IMM20:
case R_CR16_IMM32:
case R_CR16_IMM32a:
case R_CR16_REGREL4:
case R_CR16_REGREL14a:
case R_CR16_REGREL16:
case R_CR16_REGREL20:
- case R_CR16_ABS20:
+ case R_CR16_REGREL20a:
+ case R_CR16_GOT_REGREL20:
+ case R_CR16_GOTC_REGREL20:
case R_CR16_ABS24:
case R_CR16_DISP16:
case R_CR16_DISP24:
break;
case R_CR16_DISP4:
+ if (is_local)
+ Rvalue += -1;
+ break;
+
case R_CR16_DISP8:
case R_CR16_DISP24a:
+ if (is_local)
+ Rvalue -= -1;
+ break;
+
+ case R_CR16_SWITCH8:
+ case R_CR16_SWITCH16:
+ case R_CR16_SWITCH32:
/* We only care about the addend, where the difference between
expressions is kept. */
- if (is_local) Rvalue -= -1;
-
+ Rvalue = 0;
+
default:
break;
}
bfd_vma. */
reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
- if (((bfd_vma) check & ~reloc_bits) != 0
- && (((bfd_vma) check & ~reloc_bits)
- != (-(bfd_vma) 1 & ~reloc_bits)))
+ /* For GOT and GOTC relocs no boundary checks applied. */
+ if (!((r_type == R_CR16_GOT_REGREL20)
+ || (r_type == R_CR16_GOTC_REGREL20)))
{
- /* The above right shift is incorrect for a signed
- value. See if turning on the upper bits fixes the
- overflow. */
- if (howto->rightshift && (bfd_signed_vma) Rvalue < 0)
+ if (((bfd_vma) check & ~reloc_bits) != 0
+ && (((bfd_vma) check & ~reloc_bits)
+ != (-(bfd_vma) 1 & ~reloc_bits)))
{
- check |= ((bfd_vma) - 1
- & ~((bfd_vma) - 1
- >> howto->rightshift));
+ /* The above right shift is incorrect for a signed
+ value. See if turning on the upper bits fixes the
+ overflow. */
+ if (howto->rightshift && (bfd_signed_vma) Rvalue < 0)
+ {
+ check |= ((bfd_vma) - 1
+ & ~((bfd_vma) - 1
+ >> howto->rightshift));
- if (((bfd_vma) check & ~reloc_bits)
- != (-(bfd_vma) 1 & ~reloc_bits))
- return bfd_reloc_overflow;
+ if (((bfd_vma) check & ~reloc_bits)
+ != (-(bfd_vma) 1 & ~reloc_bits))
+ return bfd_reloc_overflow;
+ }
+ else
+ return bfd_reloc_overflow;
}
- else
- return bfd_reloc_overflow;
- }
- /* Drop unwanted bits from the value we are relocating to. */
- Rvalue >>= (bfd_vma) howto->rightshift;
+ /* Drop unwanted bits from the value we are relocating to. */
+ Rvalue >>= (bfd_vma) howto->rightshift;
- /* Apply dst_mask to select only relocatable part of the insn. */
- Rvalue &= howto->dst_mask;
+ /* Apply dst_mask to select only relocatable part of the insn. */
+ Rvalue &= howto->dst_mask;
+ }
switch (howto->size)
{
case 0:
- if ((r_type == R_CR16_IMM4)
- || (r_type == R_CR16_DISP4)
- || (r_type == R_CR16_DISP8))
+ if (r_type == R_CR16_DISP8)
{
Rvalue1 = bfd_get_16 (input_bfd, hit_data);
Rvalue = ((Rvalue1 & 0xf000) | ((Rvalue << 4) & 0xf00)
- | (Rvalue1 & 0x00f0) | (Rvalue & 0xf));
- bfd_put_16 (input_bfd, Rvalue, hit_data);
+ | (Rvalue1 & 0x00f0) | (Rvalue & 0xf));
+ bfd_put_16 (input_bfd, Rvalue, hit_data);
+ }
+ else if (r_type == R_CR16_IMM4)
+ {
+ Rvalue1 = bfd_get_16 (input_bfd, hit_data);
+ Rvalue = (((Rvalue1 & 0xff) << 8) | ((Rvalue << 4) & 0xf0)
+ | ((Rvalue1 & 0x0f00) >> 8));
+ bfd_put_16 (input_bfd, Rvalue, hit_data);
+ }
+ else if (r_type == R_CR16_DISP4)
+ {
+ Rvalue1 = bfd_get_16 (input_bfd, hit_data);
+ Rvalue = (Rvalue1 | ((Rvalue & 0xf) << 4));
+ bfd_put_16 (input_bfd, Rvalue, hit_data);
+ }
+ else
+ {
+ bfd_put_8 (input_bfd, (unsigned char) Rvalue, hit_data);
}
break;
{
Rvalue |= (bfd_get_16 (input_bfd, hit_data));
Rvalue = ((Rvalue & 0xfffe) | ((Rvalue >> 16) & 0x1));
+ }
+ if (r_type == R_CR16_IMM16)
+ {
+ Rvalue1 = bfd_get_16 (input_bfd, hit_data);
+
+ /* Add or subtract the offset value. */
+ if (Rvalue1 & 0x8000)
+ Rvalue -= (~Rvalue1 + 1) & 0xffff;
+ else
+ Rvalue += Rvalue1;
- bfd_put_16 (input_bfd, Rvalue, hit_data);
+ /* Check for range. */
+ if ((long) Rvalue > 0xffff || (long) Rvalue < 0x0)
+ return bfd_reloc_overflow;
}
+
+ bfd_put_16 (input_bfd, Rvalue, hit_data);
break;
case 2:
- if (r_type == R_CR16_ABS20)
- {
- Rvalue |= (((bfd_get_16 (input_bfd, hit_data) << 16)
- | (bfd_get_16 (input_bfd, hit_data + 2)))
- & ~howto->dst_mask);
- Rvalue |= (bfd_get_16 (input_bfd, hit_data + 2) << 16);
-
- /* Relocation on INSTRUCTIONS is different : Instructions are
- word-addressable, that is, each word itself is arranged according
- to little-endian convention, whereas the words are arranged with
- respect to one another in BIG ENDIAN fashion.
- When there is an immediate value that spans a word boundary,
- it is split in a big-endian way with respect to the words. */
- bfd_put_16 (input_bfd, (Rvalue) & 0xffff, hit_data);
- bfd_put_16 (input_bfd, (Rvalue >> 16)& 0xffff, hit_data + 2);
- }
- else if (r_type == R_CR16_ABS24)
+ if ((r_type == R_CR16_ABS20) || (r_type == R_CR16_IMM20))
{
- Rvalue = ((((Rvalue >> 20)& 0xf)
- | (((Rvalue >> 16) & 0xf) << 8)
- | (bfd_get_16 (input_bfd, hit_data)))
- | ((Rvalue & 0xffff) << 16));
+ Rvalue1 = (bfd_get_16 (input_bfd, hit_data + 2)
+ | (((bfd_get_16 (input_bfd, hit_data) & 0xf) <<16)));
- bfd_put_32 (input_bfd, Rvalue, hit_data);
+ /* Add or subtract the offset value. */
+ if (Rvalue1 & 0x80000)
+ Rvalue -= (~Rvalue1 + 1) & 0xfffff;
+ else
+ Rvalue += Rvalue1;
+
+ /* Check for range. */
+ if ((long) Rvalue > 0xfffff || (long) Rvalue < 0x0)
+ return bfd_reloc_overflow;
+
+ bfd_put_16 (input_bfd, ((bfd_get_16 (input_bfd, hit_data) & 0xfff0)
+ | ((Rvalue >> 16) & 0xf)), hit_data);
+ bfd_put_16 (input_bfd, (Rvalue) & 0xffff, hit_data + 2);
}
- else if (r_type == R_CR16_DISP24)
+ else if (r_type == R_CR16_GOT_REGREL20)
{
- Rvalue = ((((Rvalue >> 20)& 0xf) | (((Rvalue >> 16) & 0xf)<<8)
- | (bfd_get_16 (input_bfd, hit_data)))
- | (((Rvalue & 0xfffE) | ((Rvalue >> 24) & 0x1)) << 16));
+ asection * sgot = bfd_get_section_by_name (dynobj, ".got");
+
+ if (h != NULL)
+ {
+ bfd_vma off;
+
+ off = h->got.offset;
+ BFD_ASSERT (off != (bfd_vma) -1);
+
+ if (! elf_hash_table (info)->dynamic_sections_created
+ || SYMBOL_REFERENCES_LOCAL (info, h))
+ /* 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.
+ 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. */
+ bfd_put_32 (output_bfd, Rvalue, sgot->contents + off);
+
+ Rvalue = sgot->output_offset + off;
+ }
+ else
+ {
+ bfd_vma off;
+
+ off = elf_local_got_offsets (input_bfd)[symndx];
+ bfd_put_32 (output_bfd,Rvalue, sgot->contents + off);
+
+ Rvalue = sgot->output_offset + off;
+ }
+
+ Rvalue += addend;
+
+ /* REVISIT: if ((long) Rvalue > 0xffffff ||
+ (long) Rvalue < -0x800000). */
+ if ((long) Rvalue > 0xffffff || (long) Rvalue < 0)
+ return bfd_reloc_overflow;
+
+
+ bfd_put_16 (input_bfd, (bfd_get_16 (input_bfd, hit_data))
+ | (((Rvalue >> 16) & 0xf) << 8), hit_data);
+ bfd_put_16 (input_bfd, (Rvalue) & 0xffff, hit_data + 2);
- bfd_put_32 (input_bfd, Rvalue, hit_data);
}
- else if ((r_type == R_CR16_IMM32) || (r_type == R_CR16_IMM32a))
+ else if (r_type == R_CR16_GOTC_REGREL20)
{
- Rvalue = (((Rvalue >> 16)& 0xffff)
- | (bfd_get_16 (input_bfd, hit_data)))
- | ((Rvalue & 0xffff) << 16);
- bfd_put_32 (input_bfd, Rvalue, hit_data);
+ asection * sgot;
+ sgot = bfd_get_section_by_name (dynobj, ".got");
+
+ if (h != NULL)
+ {
+ bfd_vma off;
+
+ off = h->got.offset;
+ BFD_ASSERT (off != (bfd_vma) -1);
+
+ Rvalue >>=1; /* For code symbols. */
+
+ if (! elf_hash_table (info)->dynamic_sections_created
+ || SYMBOL_REFERENCES_LOCAL (info, h))
+ /* 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.
+ 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. */
+ bfd_put_32 (output_bfd, Rvalue, sgot->contents + off);
+
+ Rvalue = sgot->output_offset + off;
+ }
+ else
+ {
+ bfd_vma off;
+
+ off = elf_local_got_offsets (input_bfd)[symndx];
+ Rvalue >>= 1;
+ bfd_put_32 (output_bfd,Rvalue, sgot->contents + off);
+ Rvalue = sgot->output_offset + off;
+ }
+
+ Rvalue += addend;
+
+ /* Check if any value in DISP. */
+ Rvalue1 =((bfd_get_32 (input_bfd, hit_data) >>16)
+ | (((bfd_get_32 (input_bfd, hit_data) & 0xfff) >> 8) <<16));
+
+ /* Add or subtract the offset value. */
+ if (Rvalue1 & 0x80000)
+ Rvalue -= (~Rvalue1 + 1) & 0xfffff;
+ else
+ Rvalue += Rvalue1;
+
+ /* Check for range. */
+ /* REVISIT: if ((long) Rvalue > 0xffffff
+ || (long) Rvalue < -0x800000). */
+ if ((long) Rvalue > 0xffffff || (long) Rvalue < 0)
+ return bfd_reloc_overflow;
+
+ bfd_put_16 (input_bfd, (bfd_get_16 (input_bfd, hit_data))
+ | (((Rvalue >> 16) & 0xf) << 8), hit_data);
+ bfd_put_16 (input_bfd, (Rvalue) & 0xffff, hit_data + 2);
}
- else if (r_type == R_CR16_DISP24a)
+ else
{
- Rvalue = (((Rvalue & 0xfffffe) | (Rvalue >> 23)));
- Rvalue = ((Rvalue >> 16) & 0xff) | ((Rvalue & 0xffff) << 16)
- | (bfd_get_32 (input_bfd, hit_data));
+ if (r_type == R_CR16_ABS24)
+ {
+ Rvalue1 = ((bfd_get_32 (input_bfd, hit_data) >> 16)
+ | (((bfd_get_32 (input_bfd, hit_data) & 0xfff) >> 8) <<16)
+ | (((bfd_get_32 (input_bfd, hit_data) & 0xf) <<20)));
+
+ /* Add or subtract the offset value. */
+ if (Rvalue1 & 0x800000)
+ Rvalue -= (~Rvalue1 + 1) & 0xffffff;
+ else
+ Rvalue += Rvalue1;
+
+ /* Check for Range. */
+ if ((long) Rvalue > 0xffffff || (long) Rvalue < 0x0)
+ return bfd_reloc_overflow;
+
+ Rvalue = ((((Rvalue >> 20) & 0xf) | (((Rvalue >> 16) & 0xf)<<8)
+ | (bfd_get_32 (input_bfd, hit_data) & 0xf0f0))
+ | ((Rvalue & 0xffff) << 16));
+ }
+ else if (r_type == R_CR16_DISP24)
+ {
+ Rvalue = ((((Rvalue >> 20)& 0xf) | (((Rvalue >>16) & 0xf)<<8)
+ | (bfd_get_16 (input_bfd, hit_data)))
+ | (((Rvalue & 0xfffe) | ((Rvalue >> 24) & 0x1)) << 16));
+ }
+ else if ((r_type == R_CR16_IMM32) || (r_type == R_CR16_IMM32a))
+ {
+ Rvalue1 =((((bfd_get_32 (input_bfd, hit_data)) >> 16) &0xffff)
+ | (((bfd_get_32 (input_bfd, hit_data)) &0xffff)) << 16);
+
+ /* Add or subtract the offset value. */
+ if (Rvalue1 & 0x80000000)
+ Rvalue -= (~Rvalue1 + 1) & 0xffffffff;
+ else
+ Rvalue += Rvalue1;
+
+ /* Check for range. */
+ if (Rvalue > 0xffffffff || (long) Rvalue < 0x0)
+ return bfd_reloc_overflow;
+
+ Rvalue = (((Rvalue >> 16)& 0xffff) | (Rvalue & 0xffff) << 16);
+ }
+ else if (r_type == R_CR16_DISP24a)
+ {
+ Rvalue = (((Rvalue & 0xfffffe) | (Rvalue >> 23)));
+ Rvalue = ((Rvalue >> 16) & 0xff) | ((Rvalue & 0xffff) << 16)
+ | (bfd_get_32 (input_bfd, hit_data));
+ }
+ else if ((r_type == R_CR16_REGREL20)
+ || (r_type == R_CR16_REGREL20a))
+ {
+ Rvalue1 = ((bfd_get_32 (input_bfd, hit_data) >> 16)
+ | (((bfd_get_32 (input_bfd, hit_data) & 0xfff) >> 8) <<16));
+ /* Add or subtract the offset value. */
+ if (Rvalue1 & 0x80000)
+ Rvalue -= (~Rvalue1 + 1) & 0xfffff;
+ else
+ Rvalue += Rvalue1;
+
+ /* Check for range. */
+ if ((long) Rvalue > 0xfffff || (long) Rvalue < 0x0)
+ return bfd_reloc_overflow;
+
+ Rvalue = (((((Rvalue >> 20)& 0xf) | (((Rvalue >>16) & 0xf)<<8)
+ | ((Rvalue & 0xffff) << 16)))
+ | (bfd_get_32 (input_bfd, hit_data) & 0xf0ff));
+
+ }
+ else if (r_type == R_CR16_NUM32)
+ {
+ Rvalue1 = (bfd_get_32 (input_bfd, hit_data));
+
+ /* Add or subtract the offset value */
+ if (Rvalue1 & 0x80000000)
+ Rvalue -= (~Rvalue1 + 1) & 0xffffffff;
+ else
+ Rvalue += Rvalue1;
+
+ /* Check for Ranga */
+ if (Rvalue > 0xffffffff)
+ return bfd_reloc_overflow;
+ }
bfd_put_32 (input_bfd, Rvalue, hit_data);
}
- else if ((r_type == R_CR16_NUM32) || (r_type == R_CR16_NUM32a))
- {
- bfd_put_32 (input_bfd, Rvalue, hit_data);
- }
- break;
+ break;
default:
return bfd_reloc_notsupported;
for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
/* Get the new reloc address. */
if ((irel->r_offset > addr && irel->r_offset < toaddr))
- irel->r_offset -= count;
+ irel->r_offset -= count;
/* Adjust the local symbols defined in this section. */
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
{
/* Adjust the addend of SWITCH relocations in this section,
which reference this local symbol. */
+#if 0
for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
{
unsigned long r_symndx;
Elf_Internal_Sym *rsym;
bfd_vma addsym, subsym;
+ /* Skip if not a SWITCH relocation. */
+ if (ELF32_R_TYPE (irel->r_info) != (int) R_CR16_SWITCH8
+ && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_SWITCH16
+ && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_SWITCH32)
+ continue;
+
r_symndx = ELF32_R_SYM (irel->r_info);
rsym = (Elf_Internal_Sym *) symtab_hdr->contents + r_symndx;
else
continue;
}
+#endif
isym->st_value -= count;
}
/* Loop only over the symbols whom been already checked. */
for (cur_sym_hashes = start_hashes; cur_sym_hashes < sym_hashes;
cur_sym_hashes++)
- /* If the current symbol is identical to 'sym_hash', that means
- the symbol was already adjusted (or at least checked). */
- if (*cur_sym_hashes == sym_hash)
- break;
+ /* If the current symbol is identical to 'sym_hash', that means
+ the symbol was already adjusted (or at least checked). */
+ if (*cur_sym_hashes == sym_hash)
+ break;
/* Don't adjust the symbol again. */
if (cur_sym_hashes < sym_hashes)
static bfd_boolean
elf32_cr16_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 *input_bfd, asection *input_section,
+ bfd_byte *contents, Elf_Internal_Rela *relocs,
+ Elf_Internal_Sym *local_syms,
+ asection **local_sections)
{
Elf_Internal_Shdr *symtab_hdr;
struct elf_link_hash_entry **sym_hashes;
input_section,
contents, rel->r_offset,
relocation, rel->r_addend,
+ (struct elf_link_hash_entry *) h,
+ r_symndx,
info, sec, h == NULL);
if (r != bfd_reloc_ok)
bfd_size_type amt;
internal_relocs = _bfd_elf_link_read_relocs (input_bfd, input_section,
- NULL, NULL, FALSE);
+ NULL, NULL, FALSE);
if (internal_relocs == NULL)
goto error_return;
return NULL;
}
-/* This function handles relaxing for the CR16.
-
- There's quite a few relaxing opportunites available on the CR16:
+/* Assorted hash table functions. */
- * bcond:24 -> bcond:16 2 bytes
- * bcond:16 -> bcond:8 2 bytes
- * arithmetic imm32 -> arithmetic imm16 2 bytes
+/* Initialize an entry in the link hash table. */
- Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */
+/* Create an entry in an CR16 ELF linker hash table. */
-static bfd_boolean
-elf32_cr16_relax_section (bfd *abfd, asection *sec,
- struct bfd_link_info *link_info, bfd_boolean *again)
+static struct bfd_hash_entry *
+elf32_cr16_link_hash_newfunc (struct bfd_hash_entry *entry,
+ struct bfd_hash_table *table,
+ const char *string)
{
- Elf_Internal_Shdr *symtab_hdr;
- Elf_Internal_Rela *internal_relocs;
- Elf_Internal_Rela *irel, *irelend;
- bfd_byte *contents = NULL;
- Elf_Internal_Sym *isymbuf = NULL;
+ struct elf32_cr16_link_hash_entry *ret =
+ (struct elf32_cr16_link_hash_entry *) entry;
+
+ /* Allocate the structure if it has not already been allocated by a
+ subclass. */
+ if (ret == (struct elf32_cr16_link_hash_entry *) NULL)
+ ret = ((struct elf32_cr16_link_hash_entry *)
+ bfd_hash_allocate (table,
+ sizeof (struct elf32_cr16_link_hash_entry)));
+ if (ret == (struct elf32_cr16_link_hash_entry *) NULL)
+ return (struct bfd_hash_entry *) ret;
+
+ /* Call the allocation method of the superclass. */
+ ret = ((struct elf32_cr16_link_hash_entry *)
+ _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
+ table, string));
+ if (ret != (struct elf32_cr16_link_hash_entry *) NULL)
+ {
+ ret->direct_calls = 0;
+ ret->stack_size = 0;
+ ret->movm_args = 0;
+ ret->movm_stack_size = 0;
+ ret->flags = 0;
+ ret->value = 0;
+ }
- /* Assume nothing changes. */
- *again = FALSE;
+ return (struct bfd_hash_entry *) ret;
+}
- /* We don't have to do anything for a relocatable link, if
- this section does not have relocs, or if this is not a
- code section. */
- if (link_info->relocatable
- || (sec->flags & SEC_RELOC) == 0
- || sec->reloc_count == 0
- || (sec->flags & SEC_CODE) == 0)
- return TRUE;
+/* Create an cr16 ELF linker hash table. */
- symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+static struct bfd_link_hash_table *
+elf32_cr16_link_hash_table_create (bfd *abfd)
+{
+ struct elf32_cr16_link_hash_table *ret;
+ bfd_size_type amt = sizeof (struct elf32_cr16_link_hash_table);
- /* Get a copy of the native relocations. */
- internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
- link_info->keep_memory);
- if (internal_relocs == NULL)
- goto error_return;
+ ret = (struct elf32_cr16_link_hash_table *) bfd_malloc (amt);
+ if (ret == (struct elf32_cr16_link_hash_table *) NULL)
+ return NULL;
- /* Walk through them looking for relaxing opportunities. */
- irelend = internal_relocs + sec->reloc_count;
- for (irel = internal_relocs; irel < irelend; irel++)
+ if (!_bfd_elf_link_hash_table_init (&ret->root, abfd,
+ elf32_cr16_link_hash_newfunc,
+ sizeof (struct elf32_cr16_link_hash_entry)))
{
- bfd_vma symval;
+ free (ret);
+ return NULL;
+ }
+
+ ret->flags = 0;
+ amt = sizeof (struct elf_link_hash_table);
+ ret->static_hash_table
+ = (struct elf32_cr16_link_hash_table *) bfd_malloc (amt);
+ if (ret->static_hash_table == NULL)
+ {
+ free (ret);
+ return NULL;
+ }
+
+ if (!_bfd_elf_link_hash_table_init (&ret->static_hash_table->root, abfd,
+ elf32_cr16_link_hash_newfunc,
+ sizeof (struct elf32_cr16_link_hash_entry)))
+ {
+ free (ret->static_hash_table);
+ free (ret);
+ return NULL;
+ }
+ return &ret->root.root;
+}
+
+/* Free an cr16 ELF linker hash table. */
+
+static void
+elf32_cr16_link_hash_table_free (struct bfd_link_hash_table *hash)
+{
+ struct elf32_cr16_link_hash_table *ret
+ = (struct elf32_cr16_link_hash_table *) hash;
+
+ _bfd_generic_link_hash_table_free
+ ((struct bfd_link_hash_table *) ret->static_hash_table);
+ _bfd_generic_link_hash_table_free
+ ((struct bfd_link_hash_table *) ret);
+}
+
+static unsigned long
+elf_cr16_mach (flagword flags)
+{
+ switch (flags)
+ {
+ case EM_CR16:
+ default:
+ return bfd_mach_cr16;
+ }
+}
+
+/* The final processing done just before writing out a CR16 ELF object
+ file. This gets the CR16 architecture right based on the machine
+ number. */
+
+static void
+_bfd_cr16_elf_final_write_processing (bfd *abfd,
+ bfd_boolean linker ATTRIBUTE_UNUSED)
+{
+ unsigned long val;
+ switch (bfd_get_mach (abfd))
+ {
+ default:
+ case bfd_mach_cr16:
+ val = EM_CR16;
+ break;
+ }
+
+
+ elf_elfheader (abfd)->e_flags |= val;
+}
+
+
+static bfd_boolean
+_bfd_cr16_elf_object_p (bfd *abfd)
+{
+ bfd_default_set_arch_mach (abfd, bfd_arch_cr16,
+ elf_cr16_mach (elf_elfheader (abfd)->e_flags));
+ return TRUE;
+}
+
+/* Merge backend specific data from an object file to the output
+ object file when linking. */
+
+static bfd_boolean
+_bfd_cr16_elf_merge_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;
+
+ if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
+ && bfd_get_mach (obfd) < bfd_get_mach (ibfd))
+ {
+ if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
+ bfd_get_mach (ibfd)))
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+
+/* This function handles relaxing for the CR16.
+
+ There's quite a few relaxing opportunites available on the CR16:
+
+ * bcond:24 -> bcond:16 1 byte
+ * bcond:16 -> bcond:8 1 byte
+ * arithmetic imm32 -> arithmetic imm20 12 bits
+ * arithmetic imm20/imm16 -> arithmetic imm4 12/16 bits
+
+ Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */
+
+static bfd_boolean
+elf32_cr16_relax_section (bfd *abfd, asection *sec,
+ struct bfd_link_info *link_info, bfd_boolean *again)
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ Elf_Internal_Rela *internal_relocs;
+ Elf_Internal_Rela *irel, *irelend;
+ bfd_byte *contents = NULL;
+ Elf_Internal_Sym *isymbuf = NULL;
+
+ /* Assume nothing changes. */
+ *again = FALSE;
+
+ /* We don't have to do anything for a relocatable link, if
+ this section does not have relocs, or if this is not a
+ code section. */
+ if (link_info->relocatable
+ || (sec->flags & SEC_RELOC) == 0
+ || sec->reloc_count == 0
+ || (sec->flags & SEC_CODE) == 0)
+ return TRUE;
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+
+ /* Get a copy of the native relocations. */
+ internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
+ link_info->keep_memory);
+ if (internal_relocs == NULL)
+ goto error_return;
+
+ /* Walk through them looking for relaxing opportunities. */
+ irelend = internal_relocs + sec->reloc_count;
+ for (irel = internal_relocs; irel < irelend; irel++)
+ {
+ bfd_vma symval;
/* If this isn't something that can be relaxed, then ignore
this reloc. */
if (ELF32_R_TYPE (irel->r_info) != (int) R_CR16_DISP16
- && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_DISP24)
+ && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_DISP24
+ && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_IMM32
+ && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_IMM20
+ && ELF32_R_TYPE (irel->r_info) != (int) R_CR16_IMM16)
continue;
/* Get the section contents if we haven't done so already. */
the linker is run. */
/* Try to turn a 24 branch/call into a 16bit relative
- * branch/call. */
+ branch/call. */
if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_DISP24)
{
bfd_vma value = symval;
/* Verify it's a 'bcond' and fix the opcode. */
if ((code & 0xffff) == 0x0010)
- {
- bfd_put_16 (abfd, 0x1800 | ((0xf & (code >>20))<<4), contents + irel->r_offset);
- bfd_put_16 (abfd, value, contents + irel->r_offset+2);
- }
+ bfd_put_16 (abfd, 0x1800 | ((0xf & (code >> 20)) << 4), contents + irel->r_offset);
else
continue;
/* See if the value will fit in 8 bits, note the high value is
0xfc + 2 as the target will be two bytes closer if we are
able to relax. */
- if ((long) value < 0xfe && (long) value > -0x100)
+ /*if ((long) value < 0x1fa && (long) value > -0x100) REVISIT:range */
+ if ((long) value < 0xfa && (long) value > -0x100)
{
unsigned short code;
/* Get the opcode. */
code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
- /* Verify it's a 'bcond' opcode. */
- if ((code & 0xff00) == 0x1800)
- {
- bfd_put_8 (abfd, 0x1 | ((0xf & (code>>4))<<4), contents + irel->r_offset);
- bfd_put_8 (abfd, value, contents + irel->r_offset+2);
- }
+ /* Verify it's a 'bcond' and fix the opcode. */
+ if ((code & 0xff0f) == 0x1800)
+ bfd_put_16 (abfd, (code & 0xf0f0), contents + irel->r_offset);
else
continue;
}
}
-#if 0 // REVISIT: To support IMM relaxation in CR16 target
- /* Try to turn a 32bit immediate address into
- a 20bit immediate address. */
+ /* Try to turn a 32-bit IMM address into a 20/16-bit IMM address */
if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM32)
{
bfd_vma value = symval;
+ unsigned short is_add_mov = 0;
+ bfd_vma value1 = 0;
+
+ /* Get the existing value from the mcode */
+ value1 = ((bfd_get_32 (abfd, contents + irel->r_offset + 2) >> 16)
+ |(((bfd_get_32 (abfd, contents + irel->r_offset + 2) & 0xffff) << 16)));
/* See if the value will fit in 20 bits. */
- if ((long) value < 0x7ffff && (long) value > -0x80000)
+ if ((long) (value + value1) < 0xfffff && (long) (value + value1) > 0)
{
unsigned short code;
/* Get the opcode. */
code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
- /* Verify it's a 'arithmetic double'. */
- if ((code & 0xfff0) != 0x0070)
- continue;
+ /* Verify it's a 'arithmetic ADDD or MOVD instruction'.
+ For ADDD and MOVD only, convert to IMM32 -> IMM20. */
+
+ if (((code & 0xfff0) == 0x0070) || ((code & 0xfff0) == 0x0020))
+ is_add_mov = 1;
+
+ if (is_add_mov)
+ {
+ /* Note that we've changed the relocs, section contents,
+ etc. */
+ elf_section_data (sec)->relocs = internal_relocs;
+ elf_section_data (sec)->this_hdr.contents = contents;
+ symtab_hdr->contents = (unsigned char *) isymbuf;
+
+ /* Fix the opcode. */
+ if ((code & 0xfff0) == 0x0070) /* For movd. */
+ bfd_put_8 (abfd, 0x05, contents + irel->r_offset + 1);
+ else /* code == 0x0020 for addd. */
+ bfd_put_8 (abfd, 0x04, contents + irel->r_offset + 1);
+
+ bfd_put_8 (abfd, (code & 0xf) << 4, contents + irel->r_offset);
+
+ /* If existing value is nagavive adjust approriately
+ place the 16-20bits (ie 4 bit) in new opcode,
+ as the 0xffffxxxx, the higher 2 byte values removed. */
+ if (value1 & 0x80000000)
+ bfd_put_8 (abfd, (0x0f | (bfd_get_8(abfd, contents + irel->r_offset))), contents + irel->r_offset);
+ else
+ bfd_put_8 (abfd, (((value1 >> 16)&0xf) | (bfd_get_8(abfd, contents + irel->r_offset))), contents + irel->r_offset);
+
+ /* Fix the relocation's type. */
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_CR16_IMM20);
+
+ /* Delete two bytes of data. */
+ if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec,
+ irel->r_offset + 2, 2))
+ goto error_return;
+
+ /* That will change things, so, we should relax again.
+ Note that this is not required, and it may be slow. */
+ *again = TRUE;
+ }
+ }
+
+ /* See if the value will fit in 16 bits. */
+ if ((!is_add_mov)
+ && ((long)(value + value1) < 0x7fff && (long)(value + value1) > 0))
+ {
+ unsigned short code;
+
+ /* Get the opcode. */
+ code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
/* Note that we've changed the relocs, section contents, etc. */
elf_section_data (sec)->relocs = internal_relocs;
symtab_hdr->contents = (unsigned char *) isymbuf;
/* Fix the opcode. */
- bfd_put_8 (abfd, (code & 0xff) - 0x10, contents + irel->r_offset);
+ if ((code & 0xf0) == 0x70) /* For movd. */
+ bfd_put_8 (abfd, 0x54, contents + irel->r_offset + 1);
+ else if ((code & 0xf0) == 0x20) /* For addd. */
+ bfd_put_8 (abfd, 0x60, contents + irel->r_offset + 1);
+ else if ((code & 0xf0) == 0x90) /* For cmpd. */
+ bfd_put_8 (abfd, 0x56, contents + irel->r_offset + 1);
+ else
+ continue;
+
+ bfd_put_8 (abfd, 0xb0 | (code & 0xf), contents + irel->r_offset);
+
+ /* If existing value is nagavive adjust approriately
+ place the 12-16bits (ie 4 bit) in new opcode,
+ as the 0xfffffxxx, the higher 2 byte values removed. */
+ if (value1 & 0x80000000)
+ bfd_put_8 (abfd, (0x0f | (bfd_get_8(abfd, contents + irel->r_offset))), contents + irel->r_offset);
+ else
+ bfd_put_16 (abfd, value1, contents + irel->r_offset + 2);
+
/* Fix the relocation's type. */
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
- R_CR16_IMM20);
+ R_CR16_IMM16);
/* Delete two bytes of data. */
if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec,
- irel->r_offset + 2, 2))
+ irel->r_offset + 2, 2))
goto error_return;
/* That will change things, so, we should relax again.
*again = TRUE;
}
}
- /* Try to turn a 20bit/16bit immediate address into
- a 4bit immediate address. */
- if ((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM20)
- || (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM16))
+
+#if 0
+ /* Try to turn a 16bit immediate address into a 4bit
+ immediate address. */
+ if ((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM20)
+ || (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM16))
{
bfd_vma value = symval;
+ bfd_vma value1 = 0;
+
+ /* Get the existing value from the mcode */
+ value1 = ((bfd_get_16 (abfd, contents + irel->r_offset + 2) & 0xffff));
+
+ if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM20)
+ {
+ value1 |= ((bfd_get_16 (abfd, contents + irel->r_offset + 1) & 0xf000) << 0x4);
+ }
/* See if the value will fit in 4 bits. */
- if ((long) value < 0x7 && (long) value > -0x8)
+ if ((((long) (value + value1)) < 0xf)
+ && (((long) (value + value1)) > 0))
{
unsigned short code;
/* Get the opcode. */
- code = (unsigned short) bfd_get_8 (abfd, contents + irel->r_offset);
-
- /* Verify it's a 'arithmetic double'. */
- if (((code & 0xff) != 0x50) || ((code & 0xff) != 0x45))
- continue;
+ code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
/* Note that we've changed the relocs, section contents, etc. */
elf_section_data (sec)->relocs = internal_relocs;
symtab_hdr->contents = (unsigned char *) isymbuf;
/* Fix the opcode. */
- bfd_put_8 (abfd, (code & 0xff) - 0x10, contents + irel->r_offset);
+ if (((code & 0x0f00) == 0x0400) || ((code & 0x0f00) == 0x0500))
+ {
+ if ((code & 0x0f00) == 0x0400) /* For movd imm20. */
+ bfd_put_8 (abfd, 0x60, contents + irel->r_offset);
+ else /* For addd imm20. */
+ bfd_put_8 (abfd, 0x54, contents + irel->r_offset);
+ bfd_put_8 (abfd, (code & 0xf0) >> 4, contents + irel->r_offset + 1);
+ }
+ else
+ {
+ if ((code & 0xfff0) == 0x56b0) /* For cmpd imm16. */
+ bfd_put_8 (abfd, 0x56, contents + irel->r_offset);
+ else if ((code & 0xfff0) == 0x54b0) /* For movd imm16. */
+ bfd_put_8 (abfd, 0x54, contents + irel->r_offset);
+ else if ((code & 0xfff0) == 0x58b0) /* For movb imm16. */
+ bfd_put_8 (abfd, 0x58, contents + irel->r_offset);
+ else if ((code & 0xfff0) == 0x5Ab0) /* For movw imm16. */
+ bfd_put_8 (abfd, 0x5A, contents + irel->r_offset);
+ else if ((code & 0xfff0) == 0x60b0) /* For addd imm16. */
+ bfd_put_8 (abfd, 0x60, contents + irel->r_offset);
+ else if ((code & 0xfff0) == 0x30b0) /* For addb imm16. */
+ bfd_put_8 (abfd, 0x30, contents + irel->r_offset);
+ else if ((code & 0xfff0) == 0x2Cb0) /* For addub imm16. */
+ bfd_put_8 (abfd, 0x2C, contents + irel->r_offset);
+ else if ((code & 0xfff0) == 0x32b0) /* For adduw imm16. */
+ bfd_put_8 (abfd, 0x32, contents + irel->r_offset);
+ else if ((code & 0xfff0) == 0x38b0) /* For subb imm16. */
+ bfd_put_8 (abfd, 0x38, contents + irel->r_offset);
+ else if ((code & 0xfff0) == 0x3Cb0) /* For subcb imm16. */
+ bfd_put_8 (abfd, 0x3C, contents + irel->r_offset);
+ else if ((code & 0xfff0) == 0x3Fb0) /* For subcw imm16. */
+ bfd_put_8 (abfd, 0x3F, contents + irel->r_offset);
+ else if ((code & 0xfff0) == 0x3Ab0) /* For subw imm16. */
+ bfd_put_8 (abfd, 0x3A, contents + irel->r_offset);
+ else if ((code & 0xfff0) == 0x50b0) /* For cmpb imm16. */
+ bfd_put_8 (abfd, 0x50, contents + irel->r_offset);
+ else if ((code & 0xfff0) == 0x52b0) /* For cmpw imm16. */
+ bfd_put_8 (abfd, 0x52, contents + irel->r_offset);
+ else
+ continue;
+
+ bfd_put_8 (abfd, (code & 0xf), contents + irel->r_offset + 1);
+ }
/* Fix the relocation's type. */
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
/* Delete two bytes of data. */
if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec,
- irel->r_offset + 2, 2))
+ irel->r_offset + 2, 2))
goto error_return;
/* That will change things, so, we should relax again.
if (! link_info->keep_memory)
free (isymbuf);
else
- {
- /* Cache the symbols for elf_link_input_bfd. */
- symtab_hdr->contents = (unsigned char *) isymbuf;
- }
+ /* Cache the symbols for elf_link_input_bfd. */
+ symtab_hdr->contents = (unsigned char *) isymbuf;
}
if (contents != NULL
if (! link_info->keep_memory)
free (contents);
else
- {
- /* Cache the section contents for elf_link_input_bfd. */
- elf_section_data (sec)->this_hdr.contents = contents;
- }
+ /* Cache the section contents for elf_link_input_bfd. */
+ elf_section_data (sec)->this_hdr.contents = contents;
+
}
if (internal_relocs != NULL
static asection *
elf32_cr16_gc_mark_hook (asection *sec,
- struct bfd_link_info *info ATTRIBUTE_UNUSED,
- Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
- struct elf_link_hash_entry *h,
- Elf_Internal_Sym *sym)
+ struct bfd_link_info *info ATTRIBUTE_UNUSED,
+ Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
+ struct elf_link_hash_entry *h,
+ Elf_Internal_Sym *sym)
{
if (h == NULL)
return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
static bfd_boolean
elf32_cr16_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)
+ struct bfd_link_info *info ATTRIBUTE_UNUSED,
+ asection *sec ATTRIBUTE_UNUSED,
+ const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED)
{
/* We don't support garbage collection of GOT and PLT relocs yet. */
return TRUE;
}
+/* Create dynamic sections when linking against a dynamic object. */
+
+static bfd_boolean
+_bfd_cr16_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
+{
+ flagword flags;
+ asection * s;
+ const struct elf_backend_data * bed = get_elf_backend_data (abfd);
+ int ptralign = 0;
+
+ switch (bed->s->arch_size)
+ {
+ case 16:
+ ptralign = 1;
+ break;
+
+ case 32:
+ ptralign = 2;
+ break;
+
+ default:
+ bfd_set_error (bfd_error_bad_value);
+ return FALSE;
+ }
+
+ /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
+ .rel[a].bss sections. */
+
+ flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
+ | SEC_LINKER_CREATED);
+
+ s = bfd_make_section_with_flags (abfd,
+ (bed->default_use_rela_p
+ ? ".rela.plt" : ".rel.plt"),
+ flags | SEC_READONLY);
+ if (s == NULL
+ || ! bfd_set_section_alignment (abfd, s, ptralign))
+ return FALSE;
+
+ if (! _bfd_cr16_elf_create_got_section (abfd, info))
+ return FALSE;
+
+ {
+ const char * secname;
+ char * relname;
+ flagword secflags;
+ asection * sec;
+
+ for (sec = abfd->sections; sec; sec = sec->next)
+ {
+ secflags = bfd_get_section_flags (abfd, sec);
+ if ((secflags & (SEC_DATA | SEC_LINKER_CREATED))
+ || ((secflags & SEC_HAS_CONTENTS) != SEC_HAS_CONTENTS))
+ continue;
+
+ secname = bfd_get_section_name (abfd, sec);
+ relname = (char *) bfd_malloc (strlen (secname) + 6);
+ strcpy (relname, ".rela");
+ strcat (relname, secname);
+
+ s = bfd_make_section_with_flags (abfd, relname,
+ flags | SEC_READONLY);
+ if (s == NULL
+ || ! bfd_set_section_alignment (abfd, s, ptralign))
+ return FALSE;
+ }
+ }
+
+ if (bed->want_dynbss)
+ {
+ /* The .dynbss section is a place to put symbols which are defined
+ by dynamic objects, are referenced by regular objects, and are
+ not functions. We must allocate space for them in the process
+ image and use a R_*_COPY reloc to tell the dynamic linker to
+ initialize them at run time. The linker script puts the .dynbss
+ section into the .bss section of the final image. */
+ s = bfd_make_section_with_flags (abfd, ".dynbss",
+ SEC_ALLOC | SEC_LINKER_CREATED);
+ if (s == NULL)
+ 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->executable)
+ {
+ s = bfd_make_section_with_flags (abfd,
+ (bed->default_use_rela_p
+ ? ".rela.bss" : ".rel.bss"),
+ flags | SEC_READONLY);
+ if (s == NULL
+ || ! bfd_set_section_alignment (abfd, s, ptralign))
+ return FALSE;
+ }
+ }
+
+ return TRUE;
+}
+\f
+/* Adjust a symbol defined by a dynamic object and referenced by a
+ regular object. The current definition is in some section of the
+ dynamic object, but we're not including those sections. We have to
+ change the definition to something the rest of the link can
+ understand. */
+
+static bfd_boolean
+_bfd_cr16_elf_adjust_dynamic_symbol (struct bfd_link_info * info,
+ struct elf_link_hash_entry * h)
+{
+ bfd * dynobj;
+ asection * s;
+
+ dynobj = elf_hash_table (info)->dynobj;
+
+ /* Make sure we know what is going on here. */
+ BFD_ASSERT (dynobj != NULL
+ && (h->needs_plt
+ || h->u.weakdef != NULL
+ || (h->def_dynamic
+ && h->ref_regular
+ && !h->def_regular)));
+
+ /* If this is a function, put it in the procedure linkage table. We
+ will fill in the contents of the procedure linkage table later,
+ when we know the address of the .got section. */
+ if (h->type == STT_FUNC
+ || h->needs_plt)
+ {
+ if (! info->executable
+ && !h->def_dynamic
+ && !h->ref_dynamic)
+ {
+ /* This case can occur if we saw a PLT reloc in an input
+ file, but the symbol was never referred to by a dynamic
+ object. In such a case, we don't actually need to build
+ a procedure linkage table, and we can just do a REL32
+ reloc instead. */
+ BFD_ASSERT (h->needs_plt);
+ return TRUE;
+ }
+
+ /* Make sure this symbol is output as a dynamic symbol. */
+ if (h->dynindx == -1)
+ {
+ if (! bfd_elf_link_record_dynamic_symbol (info, h))
+ return FALSE;
+ }
+
+ /* We also need to make an entry in the .got.plt section, which
+ will be placed in the .got section by the linker script. */
+
+ s = bfd_get_section_by_name (dynobj, ".got.plt");
+ BFD_ASSERT (s != NULL);
+ s->size += 4;
+
+ /* We also need to make an entry in the .rela.plt section. */
+
+ s = bfd_get_section_by_name (dynobj, ".rela.plt");
+ BFD_ASSERT (s != NULL);
+ s->size += sizeof (Elf32_External_Rela);
+
+ return TRUE;
+ }
+
+ /* If this is a weak symbol, and there is a real definition, the
+ processor independent code will have arranged for us to see the
+ real definition first, and we can just use the same value. */
+ if (h->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;
+ }
+
+ /* This is a reference to a symbol defined by a dynamic object which
+ is not a function. */
+
+ /* If we are creating a shared library, we must presume that the
+ only references to the symbol are via the global offset table.
+ For such cases we need not do anything here; the relocations will
+ be handled correctly by relocate_section. */
+ if (info->executable)
+ return TRUE;
+
+ /* If there are no references to this symbol that do not use the
+ GOT, we don't need to generate a copy reloc. */
+ if (!h->non_got_ref)
+ return TRUE;
+
+ if (h->size == 0)
+ {
+ (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
+ h->root.root.string);
+ return TRUE;
+ }
+
+ /* We must allocate the symbol in our .dynbss section, which will
+ become part of the .bss section of the executable. There will be
+ an entry for this symbol in the .dynsym section. The dynamic
+ object will contain position independent code, so all references
+ from the dynamic object to this symbol will go through the global
+ offset table. The dynamic linker will use the .dynsym entry to
+ determine the address it must put in the global offset table, so
+ both the dynamic object and the regular object will refer to the
+ same memory location for the variable. */
+
+ s = bfd_get_section_by_name (dynobj, ".dynbss");
+ BFD_ASSERT (s != NULL);
+
+ /* We must generate a R_CR16_COPY reloc to tell the dynamic linker to
+ copy the initial value out of the dynamic object and into the
+ runtime process image. We need to remember the offset into the
+ .rela.bss section we are going to use. */
+ if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
+ {
+ asection * srel;
+
+ srel = bfd_get_section_by_name (dynobj, ".rela.bss");
+ BFD_ASSERT (srel != NULL);
+ srel->size += sizeof (Elf32_External_Rela);
+ h->needs_copy = 1;
+ }
+
+ return _bfd_elf_adjust_dynamic_copy (h, s);
+}
+
+/* Set the sizes of the dynamic sections. */
+
+static bfd_boolean
+_bfd_cr16_elf_size_dynamic_sections (bfd * output_bfd,
+ struct bfd_link_info * info)
+{
+ bfd * dynobj;
+ asection * s;
+ bfd_boolean plt;
+ bfd_boolean relocs;
+ bfd_boolean reltext;
+
+ dynobj = elf_hash_table (info)->dynobj;
+ BFD_ASSERT (dynobj != NULL);
+
+ if (elf_hash_table (info)->dynamic_sections_created)
+ {
+ /* Set the contents of the .interp section to the interpreter. */
+ if (info->executable)
+ {
+#if 0
+ s = bfd_get_section_by_name (dynobj, ".interp");
+ BFD_ASSERT (s != NULL);
+ s->size = sizeof ELF_DYNAMIC_INTERPRETER;
+ s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
+#endif
+ }
+ }
+ else
+ {
+ /* We may have created entries in the .rela.got section.
+ However, if we are not creating the dynamic sections, we will
+ not actually use these entries. Reset the size of .rela.got,
+ which will cause it to get stripped from the output file
+ below. */
+ s = bfd_get_section_by_name (dynobj, ".rela.got");
+ if (s != NULL)
+ s->size = 0;
+ }
+
+ /* The check_relocs and adjust_dynamic_symbol entry points have
+ determined the sizes of the various dynamic sections. Allocate
+ memory for them. */
+ plt = FALSE;
+ relocs = FALSE;
+ reltext = FALSE;
+ for (s = dynobj->sections; s != NULL; s = s->next)
+ {
+ const char * name;
+
+ if ((s->flags & SEC_LINKER_CREATED) == 0)
+ continue;
+
+ /* It's OK to base decisions on the section name, because none
+ of the dynobj section names depend upon the input files. */
+ name = bfd_get_section_name (dynobj, s);
+
+ if (strcmp (name, ".plt") == 0)
+ {
+ /* Remember whether there is a PLT. */
+ plt = s->size != 0;
+ }
+ else if (CONST_STRNEQ (name, ".rela"))
+ {
+ if (s->size != 0)
+ {
+ asection * target;
+
+ /* Remember whether there are any reloc sections other
+ than .rela.plt. */
+ if (strcmp (name, ".rela.plt") != 0)
+ {
+ const char * outname;
+
+ relocs = TRUE;
+
+ /* If this relocation section applies to a read only
+ section, then we probably need a DT_TEXTREL
+ entry. The entries in the .rela.plt section
+ really apply to the .got section, which we
+ created ourselves and so know is not readonly. */
+ outname = bfd_get_section_name (output_bfd,
+ s->output_section);
+ target = bfd_get_section_by_name (output_bfd, outname + 5);
+ if (target != NULL
+ && (target->flags & SEC_READONLY) != 0
+ && (target->flags & SEC_ALLOC) != 0)
+ reltext = TRUE;
+ }
+
+ /* We use the reloc_count field as a counter if we need
+ to copy relocs into the output file. */
+ s->reloc_count = 0;
+ }
+ }
+ else if (! CONST_STRNEQ (name, ".got")
+ && strcmp (name, ".dynbss") != 0)
+ /* It's not one of our sections, so don't allocate space. */
+ continue;
+
+ if (s->size == 0)
+ {
+ /* If we don't need this section, strip it from the
+ output file. This is mostly to handle .rela.bss and
+ .rela.plt. We must create both sections in
+ create_dynamic_sections, because they must be created
+ before the linker maps input sections to output
+ sections. The linker does that before
+ adjust_dynamic_symbol is called, and it is that
+ function which decides whether anything needs to go
+ into these sections. */
+ s->flags |= SEC_EXCLUDE;
+ continue;
+ }
+
+ if ((s->flags & SEC_HAS_CONTENTS) == 0)
+ continue;
+
+ /* Allocate memory for the section contents. We use bfd_zalloc
+ here in case unused entries are not reclaimed before the
+ section's contents are written out. This should not happen,
+ but this way if it does, we get a R_CR16_NONE reloc
+ instead of garbage. */
+ s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
+ if (s->contents == NULL)
+ return FALSE;
+ }
+
+ if (elf_hash_table (info)->dynamic_sections_created)
+ {
+ /* Add some entries to the .dynamic section. We fill in the
+ values later, in _bfd_cr16_elf_finish_dynamic_sections,
+ but we must add the entries now so that we get the correct
+ size for the .dynamic section. The DT_DEBUG entry is filled
+ in by the dynamic linker and used by the debugger. */
+ if (! info->executable)
+ {
+ if (!_bfd_elf_add_dynamic_entry (info, DT_DEBUG, 0))
+ return FALSE;
+ }
+
+ if (plt)
+ {
+ if (!_bfd_elf_add_dynamic_entry (info, DT_PLTGOT, 0)
+ || !_bfd_elf_add_dynamic_entry (info, DT_PLTRELSZ, 0)
+ || !_bfd_elf_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
+ || !_bfd_elf_add_dynamic_entry (info, DT_JMPREL, 0))
+ return FALSE;
+ }
+
+ if (relocs)
+ {
+ if (!_bfd_elf_add_dynamic_entry (info, DT_RELA, 0)
+ || !_bfd_elf_add_dynamic_entry (info, DT_RELASZ, 0)
+ || !_bfd_elf_add_dynamic_entry (info, DT_RELAENT,
+ sizeof (Elf32_External_Rela)))
+ return FALSE;
+ }
+
+ if (reltext)
+ {
+ if (!_bfd_elf_add_dynamic_entry (info, DT_TEXTREL, 0))
+ return FALSE;
+ }
+ }
+
+ return TRUE;
+}
+
+/* Finish up dynamic symbol handling. We set the contents of various
+ dynamic sections here. */
+
+static bfd_boolean
+_bfd_cr16_elf_finish_dynamic_symbol (bfd * output_bfd,
+ struct bfd_link_info * info,
+ struct elf_link_hash_entry * h,
+ Elf_Internal_Sym * sym)
+{
+ bfd * dynobj;
+
+ dynobj = elf_hash_table (info)->dynobj;
+
+ if (h->got.offset != (bfd_vma) -1)
+ {
+ asection * sgot;
+ asection * srel;
+ Elf_Internal_Rela rel;
+
+ /* This symbol has an entry in the global offset table. Set it up. */
+
+ sgot = bfd_get_section_by_name (dynobj, ".got");
+ srel = bfd_get_section_by_name (dynobj, ".rela.got");
+ BFD_ASSERT (sgot != NULL && srel != NULL);
+
+ rel.r_offset = (sgot->output_section->vma
+ + sgot->output_offset
+ + (h->got.offset & ~1));
+
+ /* If this is a -Bsymbolic link, and the symbol is defined
+ locally, we just want to emit a RELATIVE reloc. Likewise if
+ the symbol was forced to be local because of a version file.
+ The entry in the global offset table will already have been
+ initialized in the relocate_section function. */
+ if (info->executable
+ && (info->symbolic || h->dynindx == -1)
+ && h->def_regular)
+ {
+ rel.r_info = ELF32_R_INFO (0, R_CR16_GOT_REGREL20);
+ rel.r_addend = (h->root.u.def.value
+ + h->root.u.def.section->output_section->vma
+ + h->root.u.def.section->output_offset);
+ }
+ else
+ {
+ bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
+ rel.r_info = ELF32_R_INFO (h->dynindx, R_CR16_GOT_REGREL20);
+ rel.r_addend = 0;
+ }
+
+ bfd_elf32_swap_reloca_out (output_bfd, &rel,
+ (bfd_byte *) ((Elf32_External_Rela *) srel->contents
+ + srel->reloc_count));
+ ++ srel->reloc_count;
+ }
+
+ if (h->needs_copy)
+ {
+ asection * s;
+ Elf_Internal_Rela rel;
+
+ /* This symbol needs a copy reloc. Set it up. */
+ BFD_ASSERT (h->dynindx != -1
+ && (h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak));
+
+ s = bfd_get_section_by_name (h->root.u.def.section->owner,
+ ".rela.bss");
+ BFD_ASSERT (s != NULL);
+
+ rel.r_offset = (h->root.u.def.value
+ + h->root.u.def.section->output_section->vma
+ + h->root.u.def.section->output_offset);
+ rel.r_info = ELF32_R_INFO (h->dynindx, R_CR16_GOT_REGREL20);
+ rel.r_addend = 0;
+ bfd_elf32_swap_reloca_out (output_bfd, &rel,
+ (bfd_byte *) ((Elf32_External_Rela *) s->contents
+ + s->reloc_count));
+ ++ s->reloc_count;
+ }
+
+ /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
+ if (strcmp (h->root.root.string, "_DYNAMIC") == 0
+ || h == elf_hash_table (info)->hgot)
+ sym->st_shndx = SHN_ABS;
+
+ return TRUE;
+}
+
+/* Finish up the dynamic sections. */
+
+static bfd_boolean
+_bfd_cr16_elf_finish_dynamic_sections (bfd * output_bfd,
+ struct bfd_link_info * info)
+{
+ bfd * dynobj;
+ asection * sgot;
+ asection * sdyn;
+
+ dynobj = elf_hash_table (info)->dynobj;
+
+ sgot = bfd_get_section_by_name (dynobj, ".got.plt");
+ BFD_ASSERT (sgot != NULL);
+ sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
+
+ if (elf_hash_table (info)->dynamic_sections_created)
+ {
+ 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;
+ const char * name;
+ asection * s;
+
+ bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
+
+ switch (dyn.d_tag)
+ {
+ default:
+ break;
+
+ case DT_PLTGOT:
+ name = ".got";
+ goto get_vma;
+
+ case DT_JMPREL:
+ name = ".rela.plt";
+ get_vma:
+ s = bfd_get_section_by_name (output_bfd, name);
+ BFD_ASSERT (s != NULL);
+ dyn.d_un.d_ptr = s->vma;
+ bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
+ break;
+
+ case DT_PLTRELSZ:
+ s = bfd_get_section_by_name (output_bfd, ".rela.plt");
+ BFD_ASSERT (s != NULL);
+ dyn.d_un.d_val = s->size;
+ bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
+ break;
+
+ case DT_RELASZ:
+ /* My reading of the SVR4 ABI indicates that the
+ procedure linkage table relocs (DT_JMPREL) should be
+ included in the overall relocs (DT_RELA). This is
+ what Solaris does. However, UnixWare can not handle
+ that case. Therefore, we override the DT_RELASZ entry
+ here to make it not include the JMPREL relocs. Since
+ the linker script arranges for .rela.plt to follow all
+ other relocation sections, we don't have to worry
+ about changing the DT_RELA entry. */
+ s = bfd_get_section_by_name (output_bfd, ".rela.plt");
+ if (s != NULL)
+ dyn.d_un.d_val -= s->size;
+ bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
+ break;
+ }
+ }
+
+ }
+
+ /* Fill in the first three entries in the global offset table. */
+ if (sgot->size > 0)
+ {
+ if (sdyn == NULL)
+ bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
+ else
+ bfd_put_32 (output_bfd,
+ sdyn->output_section->vma + sdyn->output_offset,
+ sgot->contents);
+ }
+
+ elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
+
+ return TRUE;
+}
+
+/* Given a .data.rel 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
+ linker when the --embedded-relocs switch is used. This is called
+ after the add_symbols entry point has been called for all the
+ objects, and before the final_link entry point is called. */
+
+bfd_boolean
+bfd_cr16_elf32_create_embedded_relocs (bfd *abfd,
+ struct bfd_link_info *info,
+ asection *datasec,
+ asection *relsec,
+ char **errmsg)
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ Elf_Internal_Sym *isymbuf = NULL;
+ Elf_Internal_Rela *internal_relocs = NULL;
+ Elf_Internal_Rela *irel, *irelend;
+ bfd_byte *p;
+ bfd_size_type amt;
+
+ BFD_ASSERT (! info->relocatable);
+
+ *errmsg = NULL;
+
+ if (datasec->reloc_count == 0)
+ return TRUE;
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+
+ /* Get a copy of the native relocations. */
+ internal_relocs = (_bfd_elf_link_read_relocs
+ (abfd, datasec, NULL, NULL, info->keep_memory));
+ if (internal_relocs == NULL)
+ goto error_return;
+
+ amt = (bfd_size_type) datasec->reloc_count * 8;
+ relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
+ if (relsec->contents == NULL)
+ goto error_return;
+
+ p = relsec->contents;
+
+ irelend = internal_relocs + datasec->reloc_count;
+ for (irel = internal_relocs; irel < irelend; irel++, p += 8)
+ {
+ asection *targetsec;
+
+ /* We are going to write a four byte longword into the runtime
+ reloc section. The longword will be the address in the data
+ section which must be relocated. It is followed by the name
+ of the target section NUL-padded or truncated to 8
+ characters. */
+
+ /* We can only relocate absolute longword relocs at run time. */
+ if (!((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_NUM32a)
+ || (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_NUM32)))
+ {
+ *errmsg = _("unsupported reloc type");
+ bfd_set_error (bfd_error_bad_value);
+ goto error_return;
+ }
+
+ /* Get the target section referred to by the reloc. */
+ if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
+ {
+ /* A local symbol. */
+ Elf_Internal_Sym *isym;
+
+ /* Read this BFD's local symbols if we haven't done so already. */
+ if (isymbuf == NULL)
+ {
+ isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
+ if (isymbuf == NULL)
+ isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
+ symtab_hdr->sh_info, 0,
+ NULL, NULL, NULL);
+ if (isymbuf == NULL)
+ goto error_return;
+ }
+
+ isym = isymbuf + ELF32_R_SYM (irel->r_info);
+ targetsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
+ }
+ else
+ {
+ unsigned long indx;
+ struct elf_link_hash_entry *h;
+
+ /* An external symbol. */
+ indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
+ h = elf_sym_hashes (abfd)[indx];
+ BFD_ASSERT (h != NULL);
+ if (h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ targetsec = h->root.u.def.section;
+ else
+ targetsec = NULL;
+ }
+
+ bfd_put_32 (abfd, irel->r_offset + datasec->output_offset, p);
+ memset (p + 4, 0, 4);
+ if ((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_NUM32a)
+ && (targetsec != NULL) )
+ strncpy ((char *) p + 4, targetsec->output_section->name, 4);
+ }
+
+ if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
+ free (isymbuf);
+ if (internal_relocs != NULL
+ && elf_section_data (datasec)->relocs != internal_relocs)
+ free (internal_relocs);
+ return TRUE;
+
+error_return:
+ if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
+ free (isymbuf);
+ if (internal_relocs != NULL
+ && elf_section_data (datasec)->relocs != internal_relocs)
+ free (internal_relocs);
+ return FALSE;
+}
+
+
+/* Classify relocation types, such that combreloc can sort them
+ properly. */
+
+static enum elf_reloc_type_class
+_bfd_cr16_elf_reloc_type_class (const Elf_Internal_Rela *rela)
+{
+ switch ((int) ELF32_R_TYPE (rela->r_info))
+ {
+ case R_CR16_GOT_REGREL20:
+ case R_CR16_GOTC_REGREL20:
+ return reloc_class_relative;
+ default:
+ return reloc_class_normal;
+ }
+}
+
/* Definitions for setting CR16 target vector. */
#define TARGET_LITTLE_SYM bfd_elf32_cr16_vec
#define TARGET_LITTLE_NAME "elf32-cr16"
#define ELF_ARCH bfd_arch_cr16
#define ELF_MACHINE_CODE EM_CR16
+#define ELF_MACHINE_ALT1 EM_CR16_OLD
#define ELF_MAXPAGESIZE 0x1
#define elf_symbol_leading_char '_'
#define elf_backend_gc_sweep_hook elf32_cr16_gc_sweep_hook
#define elf_backend_can_gc_sections 1
#define elf_backend_rela_normal 1
+#define elf_backend_check_relocs cr16_elf_check_relocs
+/* So we can set bits in e_flags. */
+#define elf_backend_final_write_processing \
+ _bfd_cr16_elf_final_write_processing
+#define elf_backend_object_p _bfd_cr16_elf_object_p
+
+#define bfd_elf32_bfd_merge_private_bfd_data \
+ _bfd_cr16_elf_merge_private_bfd_data
+
+
+#define bfd_elf32_bfd_link_hash_table_create \
+ elf32_cr16_link_hash_table_create
+#define bfd_elf32_bfd_link_hash_table_free \
+ elf32_cr16_link_hash_table_free
+
+#define elf_backend_create_dynamic_sections \
+ _bfd_cr16_elf_create_dynamic_sections
+#define elf_backend_adjust_dynamic_symbol \
+ _bfd_cr16_elf_adjust_dynamic_symbol
+#define elf_backend_size_dynamic_sections \
+ _bfd_cr16_elf_size_dynamic_sections
+#define elf_backend_omit_section_dynsym \
+ ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
+#define elf_backend_finish_dynamic_symbol \
+ _bfd_cr16_elf_finish_dynamic_symbol
+#define elf_backend_finish_dynamic_sections \
+ _bfd_cr16_elf_finish_dynamic_sections
+
+#define elf_backend_reloc_type_class _bfd_cr16_elf_reloc_type_class
+
+
+#define elf_backend_want_got_plt 1
+#define elf_backend_plt_readonly 1
+#define elf_backend_want_plt_sym 0
+#define elf_backend_got_header_size 12
#include "elf32-target.h"
projects / msp430-binutils.git / blobdiff