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- /* Xstormy16-specific support for 32-bit ELF.
- Copyright (C) 2000-2022 Free Software Foundation, Inc.
- This file is part of BFD, the Binary File Descriptor library.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
- MA 02110-1301, USA. */
- #include "sysdep.h"
- #include "bfd.h"
- #include "libbfd.h"
- #include "elf-bfd.h"
- #include "elf/xstormy16.h"
- #include "libiberty.h"
- /* Handle the R_XSTORMY16_24 reloc, which has an odd bit arrangement. */
- static bfd_reloc_status_type
- xstormy16_elf_24_reloc (bfd *abfd,
- arelent *reloc_entry,
- asymbol *symbol,
- void * data,
- asection *input_section,
- bfd *output_bfd,
- char **error_message ATTRIBUTE_UNUSED)
- {
- bfd_vma relocation, x;
- if (output_bfd != NULL)
- {
- reloc_entry->address += input_section->output_offset;
- return bfd_reloc_ok;
- }
- if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
- return bfd_reloc_outofrange;
- if (bfd_is_com_section (symbol->section))
- relocation = 0;
- else
- relocation = symbol->value;
- relocation += symbol->section->output_section->vma;
- relocation += symbol->section->output_offset;
- relocation += reloc_entry->addend;
- x = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
- x &= 0x0000ff00;
- x |= relocation & 0xff;
- x |= (relocation << 8) & 0xffff0000;
- bfd_put_32 (abfd, x, (bfd_byte *) data + reloc_entry->address);
- if (relocation & ~ (bfd_vma) 0xffffff)
- return bfd_reloc_overflow;
- return bfd_reloc_ok;
- }
- static reloc_howto_type xstormy16_elf_howto_table [] =
- {
- /* This reloc does nothing. */
- HOWTO (R_XSTORMY16_NONE, /* type */
- 0, /* rightshift */
- 3, /* size (0 = byte, 1 = short, 2 = long) */
- 0, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_XSTORMY16_NONE", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0, /* dst_mask */
- false), /* pcrel_offset */
- /* A 32 bit absolute relocation. */
- HOWTO (R_XSTORMY16_32, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 32, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_XSTORMY16_32", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffffffff, /* dst_mask */
- false), /* pcrel_offset */
- /* A 16 bit absolute relocation. */
- HOWTO (R_XSTORMY16_16, /* type */
- 0, /* rightshift */
- 1, /* size (0 = byte, 1 = short, 2 = long) */
- 16, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_XSTORMY16_16", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
- /* An 8 bit absolute relocation. */
- HOWTO (R_XSTORMY16_8, /* 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_XSTORMY16_8", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xff, /* dst_mask */
- false), /* pcrel_offset */
- /* A 32 bit pc-relative relocation. */
- HOWTO (R_XSTORMY16_PC32, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 32, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_XSTORMY16_PC32", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffffffff, /* dst_mask */
- true), /* pcrel_offset */
- /* A 16 bit pc-relative relocation. */
- HOWTO (R_XSTORMY16_PC16, /* type */
- 0, /* rightshift */
- 1, /* size (0 = byte, 1 = short, 2 = long) */
- 16, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_XSTORMY16_PC16", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffffffff, /* dst_mask */
- true), /* pcrel_offset */
- /* An 8 bit pc-relative relocation. */
- HOWTO (R_XSTORMY16_PC8, /* type */
- 0, /* rightshift */
- 0, /* size (0 = byte, 1 = short, 2 = long) */
- 8, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_XSTORMY16_PC8", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffffffff, /* dst_mask */
- true), /* pcrel_offset */
- /* A 12-bit pc-relative relocation suitable for the branch instructions. */
- HOWTO (R_XSTORMY16_REL_12, /* type */
- 1, /* rightshift */
- 1, /* size (0 = byte, 1 = short, 2 = long) */
- 11, /* bitsize */
- true, /* pc_relative */
- 1, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_XSTORMY16_REL_12", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0x0ffe, /* dst_mask */
- true), /* pcrel_offset */
- /* A 24-bit absolute relocation suitable for the jump instructions. */
- HOWTO (R_XSTORMY16_24, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 24, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_unsigned, /* complain_on_overflow */
- xstormy16_elf_24_reloc, /* special_function */
- "R_XSTORMY16_24", /* name */
- true, /* partial_inplace */
- 0, /* src_mask */
- 0xffff00ff, /* dst_mask */
- true), /* pcrel_offset */
- /* A 16 bit absolute relocation to a function pointer. */
- HOWTO (R_XSTORMY16_FPTR16, /* type */
- 0, /* rightshift */
- 1, /* size (0 = byte, 1 = short, 2 = long) */
- 16, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_XSTORMY16_FPTR16", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffffffff, /* dst_mask */
- false), /* pcrel_offset */
- /* Low order 16 bit value of a high memory address. */
- HOWTO (R_XSTORMY16_LO16, /* 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_XSTORMY16_LO16", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
- /* High order 16 bit value of a high memory address. */
- HOWTO (R_XSTORMY16_HI16, /* type */
- 16, /* 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_XSTORMY16_HI16", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
- /* A 12 bit absolute relocation. */
- HOWTO (R_XSTORMY16_12, /* type */
- 0, /* rightshift */
- 1, /* size (0 = byte, 1 = short, 2 = long) */
- 12, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_XSTORMY16_12", /* name */
- false, /* partial_inplace */
- 0x0000, /* src_mask */
- 0x0fff, /* dst_mask */
- false), /* pcrel_offset */
- };
- static reloc_howto_type xstormy16_elf_howto_table2 [] =
- {
- /* GNU extension to record C++ vtable hierarchy */
- HOWTO (R_XSTORMY16_GNU_VTINHERIT, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 0, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- NULL, /* special_function */
- "R_XSTORMY16_GNU_VTINHERIT", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0, /* dst_mask */
- false), /* pcrel_offset */
- /* GNU extension to record C++ vtable member usage */
- HOWTO (R_XSTORMY16_GNU_VTENTRY, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 0, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- _bfd_elf_rel_vtable_reloc_fn, /* special_function */
- "R_XSTORMY16_GNU_VTENTRY", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0, /* dst_mask */
- false), /* pcrel_offset */
- };
- /* Map BFD reloc types to XSTORMY16 ELF reloc types. */
- typedef struct xstormy16_reloc_map
- {
- bfd_reloc_code_real_type bfd_reloc_val;
- unsigned int xstormy16_reloc_val;
- reloc_howto_type * table;
- } reloc_map;
- static const reloc_map xstormy16_reloc_map [] =
- {
- { BFD_RELOC_NONE, R_XSTORMY16_NONE, xstormy16_elf_howto_table },
- { BFD_RELOC_32, R_XSTORMY16_32, xstormy16_elf_howto_table },
- { BFD_RELOC_16, R_XSTORMY16_16, xstormy16_elf_howto_table },
- { BFD_RELOC_8, R_XSTORMY16_8, xstormy16_elf_howto_table },
- { BFD_RELOC_32_PCREL, R_XSTORMY16_PC32, xstormy16_elf_howto_table },
- { BFD_RELOC_16_PCREL, R_XSTORMY16_PC16, xstormy16_elf_howto_table },
- { BFD_RELOC_8_PCREL, R_XSTORMY16_PC8, xstormy16_elf_howto_table },
- { BFD_RELOC_XSTORMY16_REL_12, R_XSTORMY16_REL_12, xstormy16_elf_howto_table },
- { BFD_RELOC_XSTORMY16_24, R_XSTORMY16_24, xstormy16_elf_howto_table },
- { BFD_RELOC_XSTORMY16_FPTR16, R_XSTORMY16_FPTR16, xstormy16_elf_howto_table },
- { BFD_RELOC_LO16, R_XSTORMY16_LO16, xstormy16_elf_howto_table },
- { BFD_RELOC_HI16, R_XSTORMY16_HI16, xstormy16_elf_howto_table },
- { BFD_RELOC_XSTORMY16_12, R_XSTORMY16_12, xstormy16_elf_howto_table },
- { BFD_RELOC_VTABLE_INHERIT, R_XSTORMY16_GNU_VTINHERIT, xstormy16_elf_howto_table2 },
- { BFD_RELOC_VTABLE_ENTRY, R_XSTORMY16_GNU_VTENTRY, xstormy16_elf_howto_table2 },
- };
- static reloc_howto_type *
- xstormy16_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
- bfd_reloc_code_real_type code)
- {
- unsigned int i;
- for (i = ARRAY_SIZE (xstormy16_reloc_map); i--;)
- {
- const reloc_map * entry;
- entry = xstormy16_reloc_map + i;
- if (entry->bfd_reloc_val == code)
- return entry->table + (entry->xstormy16_reloc_val
- - entry->table[0].type);
- }
- return NULL;
- }
- static reloc_howto_type *
- xstormy16_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
- const char *r_name)
- {
- unsigned int i;
- for (i = 0;
- i < (sizeof (xstormy16_elf_howto_table)
- / sizeof (xstormy16_elf_howto_table[0]));
- i++)
- if (xstormy16_elf_howto_table[i].name != NULL
- && strcasecmp (xstormy16_elf_howto_table[i].name, r_name) == 0)
- return &xstormy16_elf_howto_table[i];
- for (i = 0;
- i < (sizeof (xstormy16_elf_howto_table2)
- / sizeof (xstormy16_elf_howto_table2[0]));
- i++)
- if (xstormy16_elf_howto_table2[i].name != NULL
- && strcasecmp (xstormy16_elf_howto_table2[i].name, r_name) == 0)
- return &xstormy16_elf_howto_table2[i];
- return NULL;
- }
- /* Set the howto pointer for an XSTORMY16 ELF reloc. */
- static bool
- xstormy16_info_to_howto_rela (bfd * abfd,
- arelent * cache_ptr,
- Elf_Internal_Rela * dst)
- {
- unsigned int r_type = ELF32_R_TYPE (dst->r_info);
- if (r_type <= (unsigned int) R_XSTORMY16_12)
- cache_ptr->howto = &xstormy16_elf_howto_table [r_type];
- else if (r_type - R_XSTORMY16_GNU_VTINHERIT
- <= ((unsigned int) R_XSTORMY16_GNU_VTENTRY
- - (unsigned int) R_XSTORMY16_GNU_VTINHERIT))
- cache_ptr->howto
- = &xstormy16_elf_howto_table2 [r_type - R_XSTORMY16_GNU_VTINHERIT];
- else
- {
- /* xgettext:c-format */
- _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
- abfd, r_type);
- bfd_set_error (bfd_error_bad_value);
- return false;
- }
- return true;
- }
- /* We support 16-bit pointers to code above 64k by generating a thunk
- below 64k containing a JMPF instruction to the final address. We
- cannot, unfortunately, minimize the number of thunks unless the
- -relax switch is given, as otherwise we have no idea where the
- sections will fall in the address space. */
- static bool
- xstormy16_elf_check_relocs (bfd *abfd,
- struct bfd_link_info *info,
- asection *sec,
- const Elf_Internal_Rela *relocs)
- {
- const Elf_Internal_Rela *rel, *relend;
- struct elf_link_hash_entry **sym_hashes;
- Elf_Internal_Shdr *symtab_hdr;
- bfd_vma *local_plt_offsets;
- asection *splt;
- bfd *dynobj;
- if (bfd_link_relocatable (info))
- return true;
- symtab_hdr = &elf_tdata(abfd)->symtab_hdr;
- sym_hashes = elf_sym_hashes (abfd);
- local_plt_offsets = elf_local_got_offsets (abfd);
- dynobj = elf_hash_table(info)->dynobj;
- relend = relocs + sec->reloc_count;
- for (rel = relocs; rel < relend; ++rel)
- {
- unsigned long r_symndx;
- struct elf_link_hash_entry *h;
- bfd_vma *offset;
- 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;
- }
- switch (ELF32_R_TYPE (rel->r_info))
- {
- /* This relocation describes a 16-bit pointer to a function.
- We may need to allocate a thunk in low memory; reserve memory
- for it now. */
- case R_XSTORMY16_FPTR16:
- if (rel->r_addend != 0)
- {
- (*info->callbacks->warning)
- (info, _("non-zero addend in @fptr reloc"), 0,
- abfd, 0, 0);
- }
- if (dynobj == NULL)
- elf_hash_table (info)->dynobj = dynobj = abfd;
- splt = elf_hash_table (info)->splt;
- if (splt == NULL)
- {
- flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
- | SEC_IN_MEMORY | SEC_LINKER_CREATED
- | SEC_READONLY | SEC_CODE);
- splt = bfd_make_section_anyway_with_flags (dynobj, ".plt",
- flags);
- elf_hash_table (info)->splt = splt;
- if (splt == NULL
- || !bfd_set_section_alignment (splt, 1))
- return false;
- }
- if (h != NULL)
- offset = &h->plt.offset;
- else
- {
- if (local_plt_offsets == NULL)
- {
- size_t size;
- unsigned int i;
- size = symtab_hdr->sh_info * sizeof (bfd_vma);
- local_plt_offsets = bfd_alloc (abfd, size);
- if (local_plt_offsets == NULL)
- return false;
- elf_local_got_offsets (abfd) = local_plt_offsets;
- for (i = 0; i < symtab_hdr->sh_info; i++)
- local_plt_offsets[i] = (bfd_vma) -1;
- }
- offset = &local_plt_offsets[r_symndx];
- }
- if (*offset == (bfd_vma) -1)
- {
- *offset = splt->size;
- splt->size += 4;
- }
- break;
- /* This relocation describes the C++ object vtable hierarchy.
- Reconstruct it for later use during GC. */
- case R_XSTORMY16_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_XSTORMY16_GNU_VTENTRY:
- if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
- return false;
- break;
- }
- }
- return true;
- }
- /* A subroutine of xstormy16_elf_relax_section. If the global symbol H
- is within the low 64k, remove any entry for it in the plt. */
- struct relax_plt_data
- {
- asection *splt;
- bool *again;
- };
- static bool
- xstormy16_relax_plt_check (struct elf_link_hash_entry *h, void * xdata)
- {
- struct relax_plt_data *data = (struct relax_plt_data *) xdata;
- if (h->plt.offset != (bfd_vma) -1)
- {
- bfd_vma address;
- if (h->root.type == bfd_link_hash_undefined
- || h->root.type == bfd_link_hash_undefweak)
- address = 0;
- else
- address = (h->root.u.def.section->output_section->vma
- + h->root.u.def.section->output_offset
- + h->root.u.def.value);
- if (address <= 0xffff)
- {
- h->plt.offset = -1;
- data->splt->size -= 4;
- *data->again = true;
- }
- }
- return true;
- }
- /* A subroutine of xstormy16_elf_relax_section. If the global symbol H
- previously had a plt entry, give it a new entry offset. */
- static bool
- xstormy16_relax_plt_realloc (struct elf_link_hash_entry *h, void * xdata)
- {
- bfd_vma *entry = (bfd_vma *) xdata;
- if (h->plt.offset != (bfd_vma) -1)
- {
- h->plt.offset = *entry;
- *entry += 4;
- }
- return true;
- }
- static bool
- xstormy16_elf_relax_section (bfd *dynobj,
- asection *splt,
- struct bfd_link_info *info,
- bool *again)
- {
- struct relax_plt_data relax_plt_data;
- bfd *ibfd;
- /* Assume nothing changes. */
- *again = false;
- if (bfd_link_relocatable (info)
- || !is_elf_hash_table (info->hash))
- return true;
- /* We only relax the .plt section at the moment. */
- if (dynobj != elf_hash_table (info)->dynobj
- || strcmp (splt->name, ".plt") != 0)
- return true;
- /* Quick check for an empty plt. */
- if (splt->size == 0)
- return true;
- /* Map across all global symbols; see which ones happen to
- fall in the low 64k. */
- relax_plt_data.splt = splt;
- relax_plt_data.again = again;
- elf_link_hash_traverse (elf_hash_table (info), xstormy16_relax_plt_check,
- &relax_plt_data);
- /* Likewise for local symbols, though that's somewhat less convenient
- as we have to walk the list of input bfds and swap in symbol data. */
- for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link.next)
- {
- bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
- Elf_Internal_Shdr *symtab_hdr;
- Elf_Internal_Sym *isymbuf = NULL;
- unsigned int idx;
- if (! local_plt_offsets)
- continue;
- symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
- if (symtab_hdr->sh_info != 0)
- {
- isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
- if (isymbuf == NULL)
- isymbuf = bfd_elf_get_elf_syms (ibfd, symtab_hdr,
- symtab_hdr->sh_info, 0,
- NULL, NULL, NULL);
- if (isymbuf == NULL)
- return false;
- }
- for (idx = 0; idx < symtab_hdr->sh_info; ++idx)
- {
- Elf_Internal_Sym *isym;
- asection *tsec;
- bfd_vma address;
- if (local_plt_offsets[idx] == (bfd_vma) -1)
- continue;
- isym = &isymbuf[idx];
- if (isym->st_shndx == SHN_UNDEF)
- continue;
- else if (isym->st_shndx == SHN_ABS)
- tsec = bfd_abs_section_ptr;
- else if (isym->st_shndx == SHN_COMMON)
- tsec = bfd_com_section_ptr;
- else
- tsec = bfd_section_from_elf_index (ibfd, isym->st_shndx);
- address = (tsec->output_section->vma
- + tsec->output_offset
- + isym->st_value);
- if (address <= 0xffff)
- {
- local_plt_offsets[idx] = -1;
- splt->size -= 4;
- *again = true;
- }
- }
- if (isymbuf != NULL
- && symtab_hdr->contents != (unsigned char *) isymbuf)
- {
- if (! info->keep_memory)
- free (isymbuf);
- else
- {
- /* Cache the symbols for elf_link_input_bfd. */
- symtab_hdr->contents = (unsigned char *) isymbuf;
- }
- }
- }
- /* If we changed anything, walk the symbols again to reallocate
- .plt entry addresses. */
- if (*again && splt->size > 0)
- {
- bfd_vma entry = 0;
- elf_link_hash_traverse (elf_hash_table (info),
- xstormy16_relax_plt_realloc, &entry);
- for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link.next)
- {
- bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
- unsigned int nlocals = elf_tdata (ibfd)->symtab_hdr.sh_info;
- unsigned int idx;
- if (! local_plt_offsets)
- continue;
- for (idx = 0; idx < nlocals; ++idx)
- if (local_plt_offsets[idx] != (bfd_vma) -1)
- {
- local_plt_offsets[idx] = entry;
- entry += 4;
- }
- }
- }
- return true;
- }
- static bool
- xstormy16_elf_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
- struct bfd_link_info *info)
- {
- bfd *dynobj;
- asection *splt;
- if (bfd_link_relocatable (info))
- return true;
- dynobj = elf_hash_table (info)->dynobj;
- if (dynobj == NULL)
- return true;
- splt = elf_hash_table (info)->splt;
- BFD_ASSERT (splt != NULL);
- splt->contents = bfd_zalloc (dynobj, splt->size);
- if (splt->contents == NULL)
- return false;
- return true;
- }
- /* Relocate an XSTORMY16 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 int
- xstormy16_elf_relocate_section (bfd * output_bfd ATTRIBUTE_UNUSED,
- 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)
- {
- Elf_Internal_Shdr * symtab_hdr;
- struct elf_link_hash_entry ** sym_hashes;
- Elf_Internal_Rela * rel;
- Elf_Internal_Rela * relend;
- asection *splt;
- symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
- sym_hashes = elf_sym_hashes (input_bfd);
- relend = relocs + input_section->reloc_count;
- splt = elf_hash_table (info)->splt;
- for (rel = relocs; rel < relend; rel ++)
- {
- reloc_howto_type * howto;
- unsigned long r_symndx;
- Elf_Internal_Sym * sym;
- asection * sec;
- struct elf_link_hash_entry * h;
- bfd_vma relocation;
- bfd_reloc_status_type r;
- const char * name = NULL;
- int r_type;
- r_type = ELF32_R_TYPE (rel->r_info);
- if ( r_type == R_XSTORMY16_GNU_VTINHERIT
- || r_type == R_XSTORMY16_GNU_VTENTRY)
- continue;
- r_symndx = ELF32_R_SYM (rel->r_info);
- howto = xstormy16_elf_howto_table + ELF32_R_TYPE (rel->r_info);
- h = NULL;
- sym = NULL;
- sec = NULL;
- 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
- {
- bool unresolved_reloc, warned, ignored;
- RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
- r_symndx, symtab_hdr, sym_hashes,
- h, sec, relocation,
- unresolved_reloc, warned, ignored);
- }
- if (sec != NULL && discarded_section (sec))
- RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
- rel, 1, relend, howto, 0, contents);
- if (bfd_link_relocatable (info))
- continue;
- 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 || *name == '\0')
- name = bfd_section_name (sec);
- }
- switch (ELF32_R_TYPE (rel->r_info))
- {
- case R_XSTORMY16_24:
- {
- bfd_vma reloc = relocation + rel->r_addend;
- unsigned int x;
- x = bfd_get_32 (input_bfd, contents + rel->r_offset);
- x &= 0x0000ff00;
- x |= reloc & 0xff;
- x |= (reloc << 8) & 0xffff0000;
- bfd_put_32 (input_bfd, x, contents + rel->r_offset);
- if (reloc & ~0xffffff)
- r = bfd_reloc_overflow;
- else
- r = bfd_reloc_ok;
- break;
- }
- case R_XSTORMY16_FPTR16:
- {
- bfd_vma *plt_offset;
- if (h != NULL)
- plt_offset = &h->plt.offset;
- else
- plt_offset = elf_local_got_offsets (input_bfd) + r_symndx;
- if (relocation <= 0xffff)
- {
- /* If the symbol is in range for a 16-bit address, we should
- have deallocated the plt entry in relax_section. */
- BFD_ASSERT (*plt_offset == (bfd_vma) -1);
- }
- else
- {
- /* If the symbol is out of range for a 16-bit address,
- we must have allocated a plt entry. */
- BFD_ASSERT (*plt_offset != (bfd_vma) -1);
- /* If this is the first time we've processed this symbol,
- fill in the plt entry with the correct symbol address. */
- if ((*plt_offset & 1) == 0)
- {
- unsigned int x;
- x = 0x00000200; /* jmpf */
- x |= relocation & 0xff;
- x |= (relocation << 8) & 0xffff0000;
- bfd_put_32 (input_bfd, x, splt->contents + *plt_offset);
- *plt_offset |= 1;
- }
- relocation = (splt->output_section->vma
- + splt->output_offset
- + (*plt_offset & -2));
- }
- r = _bfd_final_link_relocate (howto, input_bfd, input_section,
- contents, rel->r_offset,
- relocation, 0);
- break;
- }
- default:
- r = _bfd_final_link_relocate (howto, input_bfd, input_section,
- contents, rel->r_offset,
- relocation, rel->r_addend);
- break;
- }
- if (r != bfd_reloc_ok)
- {
- const char * msg = NULL;
- switch (r)
- {
- case bfd_reloc_overflow:
- (*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:
- (*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)
- (*info->callbacks->warning) (info, msg, name, input_bfd,
- input_section, rel->r_offset);
- }
- }
- return true;
- }
- /* This must exist if dynobj is ever set. */
- static bool
- xstormy16_elf_finish_dynamic_sections (bfd *abfd ATTRIBUTE_UNUSED,
- struct bfd_link_info *info)
- {
- bfd *dynobj = elf_hash_table (info)->dynobj;
- asection *splt = elf_hash_table (info)->splt;
- /* As an extra sanity check, verify that all plt entries have
- been filled in. */
- if (dynobj != NULL && splt != NULL)
- {
- bfd_byte *contents = splt->contents;
- unsigned int i, size = splt->size;
- for (i = 0; i < size; i += 4)
- {
- unsigned int x = bfd_get_32 (dynobj, contents + i);
- BFD_ASSERT (x != 0);
- }
- }
- return true;
- }
- /* Return the section that should be marked against GC for a given
- relocation. */
- static asection *
- xstormy16_elf_gc_mark_hook (asection *sec,
- struct bfd_link_info *info,
- 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_XSTORMY16_GNU_VTINHERIT:
- case R_XSTORMY16_GNU_VTENTRY:
- return NULL;
- }
- return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
- }
- #define ELF_ARCH bfd_arch_xstormy16
- #define ELF_MACHINE_CODE EM_XSTORMY16
- #define ELF_MAXPAGESIZE 0x100
- #define TARGET_LITTLE_SYM xstormy16_elf32_vec
- #define TARGET_LITTLE_NAME "elf32-xstormy16"
- #define elf_info_to_howto_rel NULL
- #define elf_info_to_howto xstormy16_info_to_howto_rela
- #define elf_backend_relocate_section xstormy16_elf_relocate_section
- #define elf_backend_gc_mark_hook xstormy16_elf_gc_mark_hook
- #define elf_backend_check_relocs xstormy16_elf_check_relocs
- #define elf_backend_always_size_sections \
- xstormy16_elf_always_size_sections
- #define elf_backend_omit_section_dynsym \
- _bfd_elf_omit_section_dynsym_all
- #define elf_backend_finish_dynamic_sections \
- xstormy16_elf_finish_dynamic_sections
- #define elf_backend_can_gc_sections 1
- #define elf_backend_rela_normal 1
- #define bfd_elf32_bfd_reloc_type_lookup xstormy16_reloc_type_lookup
- #define bfd_elf32_bfd_reloc_name_lookup \
- xstormy16_reloc_name_lookup
- #define bfd_elf32_bfd_relax_section xstormy16_elf_relax_section
- #include "elf32-target.h"
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