diff options
Diffstat (limited to 'bfd/elf32-sh.c')
| -rw-r--r-- | bfd/elf32-sh.c | 2059 |
1 files changed, 2059 insertions, 0 deletions
diff --git a/bfd/elf32-sh.c b/bfd/elf32-sh.c new file mode 100644 index 00000000000..ebbe352456e --- /dev/null +++ b/bfd/elf32-sh.c @@ -0,0 +1,2059 @@ +/* Hitachi SH specific support for 32-bit ELF + Copyright 1996, 1997, 1998 Free Software Foundation, Inc. + Contributed by Ian Lance Taylor, Cygnus Support. + +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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#include "bfd.h" +#include "sysdep.h" +#include "bfdlink.h" +#include "libbfd.h" +#include "elf-bfd.h" +#include "elf/sh.h" + +static bfd_reloc_status_type sh_elf_reloc + PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); +static bfd_reloc_status_type sh_elf_ignore_reloc + PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); +static reloc_howto_type *sh_elf_reloc_type_lookup + PARAMS ((bfd *, bfd_reloc_code_real_type)); +static void sh_elf_info_to_howto + PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); +static boolean sh_elf_relax_section + PARAMS ((bfd *, asection *, struct bfd_link_info *, boolean *)); +static boolean sh_elf_relax_delete_bytes + PARAMS ((bfd *, asection *, bfd_vma, int)); +static boolean sh_elf_align_loads + PARAMS ((bfd *, asection *, Elf_Internal_Rela *, bfd_byte *, boolean *)); +static boolean sh_elf_swap_insns + PARAMS ((bfd *, asection *, PTR, bfd_byte *, bfd_vma)); +static boolean sh_elf_relocate_section + PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, + Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); +static bfd_byte *sh_elf_get_relocated_section_contents + PARAMS ((bfd *, struct bfd_link_info *, struct bfd_link_order *, + bfd_byte *, boolean, asymbol **)); + +static reloc_howto_type sh_elf_howto_table[] = +{ + /* No relocation. */ + HOWTO (R_SH_NONE, /* type */ + 0, /* rightshift */ + 0, /* size (0 = byte, 1 = short, 2 = long) */ + 0, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + sh_elf_reloc, /* special_function */ + "R_SH_NONE", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + false), /* pcrel_offset */ + + /* 32 bit absolute relocation. Setting partial_inplace to true and + src_mask to a non-zero value is similar to the COFF toolchain. */ + HOWTO (R_SH_DIR32, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + sh_elf_reloc, /* special_function */ + "R_SH_DIR32", /* name */ + true, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* 32 bit PC relative relocation. */ + HOWTO (R_SH_REL32, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + true, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + sh_elf_reloc, /* special_function */ + "R_SH_REL32", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0xffffffff, /* dst_mask */ + true), /* pcrel_offset */ + + /* 8 bit PC relative branch divided by 2. */ + HOWTO (R_SH_DIR8WPN, /* type */ + 1, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 8, /* bitsize */ + true, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + sh_elf_reloc, /* special_function */ + "R_SH_DIR8WPN", /* name */ + true, /* partial_inplace */ + 0xff, /* src_mask */ + 0xff, /* dst_mask */ + true), /* pcrel_offset */ + + /* 12 bit PC relative branch divided by 2. */ + HOWTO (R_SH_IND12W, /* type */ + 1, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 12, /* bitsize */ + true, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + sh_elf_reloc, /* special_function */ + "R_SH_IND12W", /* name */ + true, /* partial_inplace */ + 0xfff, /* src_mask */ + 0xfff, /* dst_mask */ + true), /* pcrel_offset */ + + /* 8 bit unsigned PC relative divided by 4. */ + HOWTO (R_SH_DIR8WPL, /* type */ + 2, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 8, /* bitsize */ + true, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_unsigned, /* complain_on_overflow */ + sh_elf_reloc, /* special_function */ + "R_SH_DIR8WPL", /* name */ + true, /* partial_inplace */ + 0xff, /* src_mask */ + 0xff, /* dst_mask */ + true), /* pcrel_offset */ + + /* 8 bit unsigned PC relative divided by 2. */ + HOWTO (R_SH_DIR8WPZ, /* type */ + 1, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 8, /* bitsize */ + true, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_unsigned, /* complain_on_overflow */ + sh_elf_reloc, /* special_function */ + "R_SH_DIR8WPZ", /* name */ + true, /* partial_inplace */ + 0xff, /* src_mask */ + 0xff, /* dst_mask */ + true), /* pcrel_offset */ + + /* 8 bit GBR relative. FIXME: This only makes sense if we have some + special symbol for the GBR relative area, and that is not + implemented. */ + HOWTO (R_SH_DIR8BP, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 8, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_unsigned, /* complain_on_overflow */ + sh_elf_reloc, /* special_function */ + "R_SH_DIR8BP", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0xff, /* dst_mask */ + true), /* pcrel_offset */ + + /* 8 bit GBR relative divided by 2. FIXME: This only makes sense if + we have some special symbol for the GBR relative area, and that + is not implemented. */ + HOWTO (R_SH_DIR8W, /* type */ + 1, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 8, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_unsigned, /* complain_on_overflow */ + sh_elf_reloc, /* special_function */ + "R_SH_DIR8W", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0xff, /* dst_mask */ + true), /* pcrel_offset */ + + /* 8 bit GBR relative divided by 4. FIXME: This only makes sense if + we have some special symbol for the GBR relative area, and that + is not implemented. */ + HOWTO (R_SH_DIR8L, /* type */ + 2, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 8, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_unsigned, /* complain_on_overflow */ + sh_elf_reloc, /* special_function */ + "R_SH_DIR8L", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0xff, /* dst_mask */ + true), /* pcrel_offset */ + + { 10 }, + { 11 }, + { 12 }, + { 13 }, + { 14 }, + { 15 }, + { 16 }, + { 17 }, + { 18 }, + { 19 }, + { 20 }, + { 21 }, + { 22 }, + { 23 }, + { 24 }, + + /* The remaining relocs are a GNU extension used for relaxing. The + final pass of the linker never needs to do anything with any of + these relocs. Any required operations are handled by the + relaxation code. */ + + /* 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_SH_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 */ + sh_elf_ignore_reloc, /* special_function */ + "R_SH_SWITCH16", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0, /* 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_SH_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 */ + sh_elf_ignore_reloc, /* special_function */ + "R_SH_SWITCH32", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + true), /* pcrel_offset */ + + /* Indicates a .uses pseudo-op. The compiler will generate .uses + pseudo-ops when it finds a function call which can be relaxed. + The offset field holds the PC relative offset to the instruction + which loads the register used in the function call. */ + HOWTO (R_SH_USES, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 0, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_unsigned, /* complain_on_overflow */ + sh_elf_ignore_reloc, /* special_function */ + "R_SH_USES", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + true), /* pcrel_offset */ + + /* The assembler will generate this reloc for addresses referred to + by the register loads associated with USES relocs. The offset + field holds the number of times the address is referenced in the + object file. */ + HOWTO (R_SH_COUNT, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 0, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_unsigned, /* complain_on_overflow */ + sh_elf_ignore_reloc, /* special_function */ + "R_SH_COUNT", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + true), /* pcrel_offset */ + + /* Indicates an alignment statement. The offset field is the power + of 2 to which subsequent portions of the object file must be + aligned. */ + HOWTO (R_SH_ALIGN, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 0, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_unsigned, /* complain_on_overflow */ + sh_elf_ignore_reloc, /* special_function */ + "R_SH_ALIGN", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + true), /* pcrel_offset */ + + /* The assembler will generate this reloc before a block of + instructions. A section should be processed as assumining it + contains data, unless this reloc is seen. */ + HOWTO (R_SH_CODE, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 0, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_unsigned, /* complain_on_overflow */ + sh_elf_ignore_reloc, /* special_function */ + "R_SH_CODE", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + true), /* pcrel_offset */ + + /* The assembler will generate this reloc after a block of + instructions when it sees data that is not instructions. */ + HOWTO (R_SH_DATA, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 0, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_unsigned, /* complain_on_overflow */ + sh_elf_ignore_reloc, /* special_function */ + "R_SH_DATA", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + true), /* pcrel_offset */ + + /* The assembler generates this reloc for each label within a block + of instructions. This permits the linker to avoid swapping + instructions which are the targets of branches. */ + HOWTO (R_SH_LABEL, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 0, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_unsigned, /* complain_on_overflow */ + sh_elf_ignore_reloc, /* special_function */ + "R_SH_LABEL", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + true), /* pcrel_offset */ + + /* An 8 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_SH_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 */ + sh_elf_ignore_reloc, /* special_function */ + "R_SH_SWITCH8", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + true), /* pcrel_offset */ + + /* GNU extension to record C++ vtable hierarchy */ + HOWTO (R_SH_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_SH_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_SH_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_SH_GNU_VTENTRY", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + false), /* pcrel_offset */ + +}; + +/* This function is used for normal relocs. This is like the COFF + function, and is almost certainly incorrect for other ELF targets. */ + +static bfd_reloc_status_type +sh_elf_reloc (abfd, reloc_entry, symbol_in, data, input_section, output_bfd, + error_message) + bfd *abfd; + arelent *reloc_entry; + asymbol *symbol_in; + PTR data; + asection *input_section; + bfd *output_bfd; + char **error_message; +{ + unsigned long insn; + bfd_vma sym_value; + enum elf_sh_reloc_type r_type; + bfd_vma addr = reloc_entry->address; + bfd_byte *hit_data = addr + (bfd_byte *) data; + + r_type = (enum elf_sh_reloc_type) reloc_entry->howto->type; + + if (output_bfd != NULL) + { + /* Partial linking--do nothing. */ + reloc_entry->address += input_section->output_offset; + return bfd_reloc_ok; + } + + /* Almost all relocs have to do with relaxing. If any work must be + done for them, it has been done in sh_relax_section. */ + if (r_type != R_SH_DIR32 + && (r_type != R_SH_IND12W + || (symbol_in->flags & BSF_LOCAL) != 0)) + return bfd_reloc_ok; + + if (symbol_in != NULL + && bfd_is_und_section (symbol_in->section)) + return bfd_reloc_undefined; + + if (bfd_is_com_section (symbol_in->section)) + sym_value = 0; + else + sym_value = (symbol_in->value + + symbol_in->section->output_section->vma + + symbol_in->section->output_offset); + + switch (r_type) + { + case R_SH_DIR32: + insn = bfd_get_32 (abfd, hit_data); + insn += sym_value + reloc_entry->addend; + bfd_put_32 (abfd, insn, hit_data); + break; + case R_SH_IND12W: + insn = bfd_get_16 (abfd, hit_data); + sym_value += reloc_entry->addend; + sym_value -= (input_section->output_section->vma + + input_section->output_offset + + addr + + 4); + sym_value += (insn & 0xfff) << 1; + if (insn & 0x800) + sym_value -= 0x1000; + insn = (insn & 0xf000) | (sym_value & 0xfff); + bfd_put_16 (abfd, insn, hit_data); + if (sym_value < (bfd_vma) -0x1000 || sym_value >= 0x1000) + return bfd_reloc_overflow; + break; + default: + abort (); + break; + } + + return bfd_reloc_ok; +} + +/* This function is used for relocs which are only used for relaxing, + which the linker should otherwise ignore. */ + +static bfd_reloc_status_type +sh_elf_ignore_reloc (abfd, reloc_entry, symbol, data, input_section, + output_bfd, error_message) + bfd *abfd; + arelent *reloc_entry; + asymbol *symbol; + PTR data; + asection *input_section; + bfd *output_bfd; + char **error_message; +{ + if (output_bfd != NULL) + reloc_entry->address += input_section->output_offset; + return bfd_reloc_ok; +} + +/* This structure is used to map BFD reloc codes to SH ELF relocs. */ + +struct elf_reloc_map +{ + bfd_reloc_code_real_type bfd_reloc_val; + unsigned char elf_reloc_val; +}; + +/* An array mapping BFD reloc codes to SH ELF relocs. */ + +static const struct elf_reloc_map sh_reloc_map[] = +{ + { BFD_RELOC_NONE, R_SH_NONE }, + { BFD_RELOC_32, R_SH_DIR32 }, + { BFD_RELOC_CTOR, R_SH_DIR32 }, + { BFD_RELOC_32_PCREL, R_SH_REL32 }, + { BFD_RELOC_SH_PCDISP8BY2, R_SH_DIR8WPN }, + { BFD_RELOC_SH_PCDISP12BY2, R_SH_IND12W }, + { BFD_RELOC_SH_PCRELIMM8BY2, R_SH_DIR8WPZ }, + { BFD_RELOC_SH_PCRELIMM8BY4, R_SH_DIR8WPL }, + { BFD_RELOC_8_PCREL, R_SH_SWITCH8 }, + { BFD_RELOC_SH_SWITCH16, R_SH_SWITCH16 }, + { BFD_RELOC_SH_SWITCH32, R_SH_SWITCH32 }, + { BFD_RELOC_SH_USES, R_SH_USES }, + { BFD_RELOC_SH_COUNT, R_SH_COUNT }, + { BFD_RELOC_SH_ALIGN, R_SH_ALIGN }, + { BFD_RELOC_SH_CODE, R_SH_CODE }, + { BFD_RELOC_SH_DATA, R_SH_DATA }, + { BFD_RELOC_SH_LABEL, R_SH_LABEL }, + { BFD_RELOC_VTABLE_INHERIT, R_SH_GNU_VTINHERIT }, + { BFD_RELOC_VTABLE_ENTRY, R_SH_GNU_VTENTRY }, +}; + +/* Given a BFD reloc code, return the howto structure for the + corresponding SH ELf reloc. */ + +static reloc_howto_type * +sh_elf_reloc_type_lookup (abfd, code) + bfd *abfd; + bfd_reloc_code_real_type code; +{ + unsigned int i; + + for (i = 0; i < sizeof (sh_reloc_map) / sizeof (struct elf_reloc_map); i++) + { + if (sh_reloc_map[i].bfd_reloc_val == code) + return &sh_elf_howto_table[(int) sh_reloc_map[i].elf_reloc_val]; + } + + return NULL; +} + +/* Given an ELF reloc, fill in the howto field of a relent. */ + +static void +sh_elf_info_to_howto (abfd, cache_ptr, dst) + bfd *abfd; + arelent *cache_ptr; + Elf_Internal_Rela *dst; +{ + unsigned int r; + + r = ELF32_R_TYPE (dst->r_info); + + BFD_ASSERT (r < (unsigned int) R_SH_max); + BFD_ASSERT (r < R_SH_FIRST_INVALID_RELOC || r > R_SH_LAST_INVALID_RELOC); + + cache_ptr->howto = &sh_elf_howto_table[r]; +} + +/* This function handles relaxing for SH ELF. See the corresponding + function in coff-sh.c for a description of what this does. FIXME: + There is a lot of duplication here between this code and the COFF + specific code. The format of relocs and symbols is wound deeply + into this code, but it would still be better if the duplication + could be eliminated somehow. Note in particular that although both + functions use symbols like R_SH_CODE, those symbols have different + values; in coff-sh.c they come from include/coff/sh.h, whereas here + they come from enum elf_sh_reloc_type in include/elf/sh.h. */ + +static boolean +sh_elf_relax_section (abfd, sec, link_info, again) + bfd *abfd; + asection *sec; + struct bfd_link_info *link_info; + boolean *again; +{ + Elf_Internal_Shdr *symtab_hdr; + Elf_Internal_Rela *internal_relocs; + Elf_Internal_Rela *free_relocs = NULL; + boolean have_code; + Elf_Internal_Rela *irel, *irelend; + bfd_byte *contents = NULL; + bfd_byte *free_contents = NULL; + Elf32_External_Sym *extsyms = NULL; + Elf32_External_Sym *free_extsyms = NULL; + + *again = false; + + if (link_info->relocateable + || (sec->flags & SEC_RELOC) == 0 + || sec->reloc_count == 0) + return true; + + /* If this is the first time we have been called for this section, + initialize the cooked size. */ + if (sec->_cooked_size == 0) + sec->_cooked_size = sec->_raw_size; + + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + + internal_relocs = (_bfd_elf32_link_read_relocs + (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL, + link_info->keep_memory)); + if (internal_relocs == NULL) + goto error_return; + if (! link_info->keep_memory) + free_relocs = internal_relocs; + + have_code = false; + + irelend = internal_relocs + sec->reloc_count; + for (irel = internal_relocs; irel < irelend; irel++) + { + bfd_vma laddr, paddr, symval; + unsigned short insn; + Elf_Internal_Rela *irelfn, *irelscan, *irelcount; + bfd_signed_vma foff; + + if (ELF32_R_TYPE (irel->r_info) == (int) R_SH_CODE) + have_code = true; + + if (ELF32_R_TYPE (irel->r_info) != (int) R_SH_USES) + continue; + + /* Get the section contents. */ + if (contents == NULL) + { + if (elf_section_data (sec)->this_hdr.contents != NULL) + contents = elf_section_data (sec)->this_hdr.contents; + else + { + contents = (bfd_byte *) bfd_malloc (sec->_raw_size); + if (contents == NULL) + goto error_return; + free_contents = contents; + + if (! bfd_get_section_contents (abfd, sec, contents, + (file_ptr) 0, sec->_raw_size)) + goto error_return; + } + } + + /* The r_addend field of the R_SH_USES reloc will point us to + the register load. The 4 is because the r_addend field is + computed as though it were a jump offset, which are based + from 4 bytes after the jump instruction. */ + laddr = irel->r_offset + 4 + irel->r_addend; + if (laddr >= sec->_raw_size) + { + (*_bfd_error_handler) (_("%s: 0x%lx: warning: bad R_SH_USES offset"), + bfd_get_filename (abfd), + (unsigned long) irel->r_offset); + continue; + } + insn = bfd_get_16 (abfd, contents + laddr); + + /* If the instruction is not mov.l NN,rN, we don't know what to + do. */ + if ((insn & 0xf000) != 0xd000) + { + ((*_bfd_error_handler) + (_("%s: 0x%lx: warning: R_SH_USES points to unrecognized insn 0x%x"), + bfd_get_filename (abfd), (unsigned long) irel->r_offset, insn)); + continue; + } + + /* Get the address from which the register is being loaded. The + displacement in the mov.l instruction is quadrupled. It is a + displacement from four bytes after the movl instruction, but, + before adding in the PC address, two least significant bits + of the PC are cleared. We assume that the section is aligned + on a four byte boundary. */ + paddr = insn & 0xff; + paddr *= 4; + paddr += (laddr + 4) &~ 3; + if (paddr >= sec->_raw_size) + { + ((*_bfd_error_handler) + (_("%s: 0x%lx: warning: bad R_SH_USES load offset"), + bfd_get_filename (abfd), (unsigned long) irel->r_offset)); + continue; + } + + /* Get the reloc for the address from which the register is + being loaded. This reloc will tell us which function is + actually being called. */ + for (irelfn = internal_relocs; irelfn < irelend; irelfn++) + if (irelfn->r_offset == paddr + && ELF32_R_TYPE (irelfn->r_info) == (int) R_SH_DIR32) + break; + if (irelfn >= irelend) + { + ((*_bfd_error_handler) + (_("%s: 0x%lx: warning: could not find expected reloc"), + bfd_get_filename (abfd), (unsigned long) paddr)); + continue; + } + + /* Read this BFD's symbols if we haven't done so already. */ + if (extsyms == NULL) + { + if (symtab_hdr->contents != NULL) + extsyms = (Elf32_External_Sym *) symtab_hdr->contents; + else + { + extsyms = ((Elf32_External_Sym *) + bfd_malloc (symtab_hdr->sh_size)); + if (extsyms == NULL) + goto error_return; + free_extsyms = extsyms; + if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0 + || (bfd_read (extsyms, 1, symtab_hdr->sh_size, abfd) + != symtab_hdr->sh_size)) + goto error_return; + } + } + + /* Get the value of the symbol referred to by the reloc. */ + if (ELF32_R_SYM (irelfn->r_info) < symtab_hdr->sh_info) + { + Elf_Internal_Sym isym; + + /* A local symbol. */ + bfd_elf32_swap_symbol_in (abfd, + extsyms + ELF32_R_SYM (irelfn->r_info), + &isym); + + if (isym.st_shndx != _bfd_elf_section_from_bfd_section (abfd, sec)) + { + ((*_bfd_error_handler) + (_("%s: 0x%lx: warning: symbol in unexpected section"), + bfd_get_filename (abfd), (unsigned long) paddr)); + continue; + } + + symval = (isym.st_value + + sec->output_section->vma + + sec->output_offset); + } + else + { + unsigned long indx; + struct elf_link_hash_entry *h; + + indx = ELF32_R_SYM (irelfn->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) + { + /* This appears to be a reference to an undefined + symbol. Just ignore it--it will be caught by the + regular reloc processing. */ + continue; + } + + symval = (h->root.u.def.value + + h->root.u.def.section->output_section->vma + + h->root.u.def.section->output_offset); + } + + symval += bfd_get_32 (abfd, contents + paddr); + + /* See if this function call can be shortened. */ + foff = (symval + - (irel->r_offset + + sec->output_section->vma + + sec->output_offset + + 4)); + if (foff < -0x1000 || foff >= 0x1000) + { + /* After all that work, we can't shorten this function call. */ + continue; + } + + /* Shorten the function call. */ + + /* For simplicity of coding, we are going to modify the section + contents, the section relocs, and the BFD symbol table. We + must tell the rest of the code not to free up this + information. It would be possible to instead create a table + of changes which have to be made, as is done in coff-mips.c; + that would be more work, but would require less memory when + the linker is run. */ + + elf_section_data (sec)->relocs = internal_relocs; + free_relocs = NULL; + + elf_section_data (sec)->this_hdr.contents = contents; + free_contents = NULL; + + symtab_hdr->contents = (bfd_byte *) extsyms; + free_extsyms = NULL; + + /* Replace the jsr with a bsr. */ + + /* Change the R_SH_USES reloc into an R_SH_IND12W reloc, and + replace the jsr with a bsr. */ + irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irelfn->r_info), R_SH_IND12W); + if (ELF32_R_SYM (irelfn->r_info) < symtab_hdr->sh_info) + { + /* If this needs to be changed because of future relaxing, + it will be handled here like other internal IND12W + relocs. */ + bfd_put_16 (abfd, + 0xb000 | ((foff >> 1) & 0xfff), + contents + irel->r_offset); + } + else + { + /* We can't fully resolve this yet, because the external + symbol value may be changed by future relaxing. We let + the final link phase handle it. */ + bfd_put_16 (abfd, 0xb000, contents + irel->r_offset); + } + + /* See if there is another R_SH_USES reloc referring to the same + register load. */ + for (irelscan = internal_relocs; irelscan < irelend; irelscan++) + if (ELF32_R_TYPE (irelscan->r_info) == (int) R_SH_USES + && laddr == irelscan->r_offset + 4 + irelscan->r_addend) + break; + if (irelscan < irelend) + { + /* Some other function call depends upon this register load, + and we have not yet converted that function call. + Indeed, we may never be able to convert it. There is + nothing else we can do at this point. */ + continue; + } + + /* Look for a R_SH_COUNT reloc on the location where the + function address is stored. Do this before deleting any + bytes, to avoid confusion about the address. */ + for (irelcount = internal_relocs; irelcount < irelend; irelcount++) + if (irelcount->r_offset == paddr + && ELF32_R_TYPE (irelcount->r_info) == (int) R_SH_COUNT) + break; + + /* Delete the register load. */ + if (! sh_elf_relax_delete_bytes (abfd, sec, laddr, 2)) + goto error_return; + + /* That will change things, so, just in case it permits some + other function call to come within range, we should relax + again. Note that this is not required, and it may be slow. */ + *again = true; + + /* Now check whether we got a COUNT reloc. */ + if (irelcount >= irelend) + { + ((*_bfd_error_handler) + (_("%s: 0x%lx: warning: could not find expected COUNT reloc"), + bfd_get_filename (abfd), (unsigned long) paddr)); + continue; + } + + /* The number of uses is stored in the r_addend field. We've + just deleted one. */ + if (irelcount->r_addend == 0) + { + ((*_bfd_error_handler) (_("%s: 0x%lx: warning: bad count"), + bfd_get_filename (abfd), + (unsigned long) paddr)); + continue; + } + + --irelcount->r_addend; + + /* If there are no more uses, we can delete the address. Reload + the address from irelfn, in case it was changed by the + previous call to sh_elf_relax_delete_bytes. */ + if (irelcount->r_addend == 0) + { + if (! sh_elf_relax_delete_bytes (abfd, sec, irelfn->r_offset, 4)) + goto error_return; + } + + /* We've done all we can with that function call. */ + } + + /* Look for load and store instructions that we can align on four + byte boundaries. */ + if (have_code) + { + boolean swapped; + + /* Get the section contents. */ + if (contents == NULL) + { + if (elf_section_data (sec)->this_hdr.contents != NULL) + contents = elf_section_data (sec)->this_hdr.contents; + else + { + contents = (bfd_byte *) bfd_malloc (sec->_raw_size); + if (contents == NULL) + goto error_return; + free_contents = contents; + + if (! bfd_get_section_contents (abfd, sec, contents, + (file_ptr) 0, sec->_raw_size)) + goto error_return; + } + } + + if (! sh_elf_align_loads (abfd, sec, internal_relocs, contents, + &swapped)) + goto error_return; + + if (swapped) + { + elf_section_data (sec)->relocs = internal_relocs; + free_relocs = NULL; + + elf_section_data (sec)->this_hdr.contents = contents; + free_contents = NULL; + + symtab_hdr->contents = (bfd_byte *) extsyms; + free_extsyms = NULL; + } + } + + if (free_relocs != NULL) + { + free (free_relocs); + free_relocs = NULL; + } + + if (free_contents != NULL) + { + if (! link_info->keep_memory) + free (free_contents); + else + { + /* Cache the section contents for elf_link_input_bfd. */ + elf_section_data (sec)->this_hdr.contents = contents; + } + free_contents = NULL; + } + + if (free_extsyms != NULL) + { + if (! link_info->keep_memory) + free (free_extsyms); + else + { + /* Cache the symbols for elf_link_input_bfd. */ + symtab_hdr->contents = extsyms; + } + free_extsyms = NULL; + } + + return true; + + error_return: + if (free_relocs != NULL) + free (free_relocs); + if (free_contents != NULL) + free (free_contents); + if (free_extsyms != NULL) + free (free_extsyms); + return false; +} + +/* Delete some bytes from a section while relaxing. FIXME: There is a + lot of duplication between this function and sh_relax_delete_bytes + in coff-sh.c. */ + +static boolean +sh_elf_relax_delete_bytes (abfd, sec, addr, count) + bfd *abfd; + asection *sec; + bfd_vma addr; + int count; +{ + Elf_Internal_Shdr *symtab_hdr; + Elf32_External_Sym *extsyms; + int shndx, index; + bfd_byte *contents; + Elf_Internal_Rela *irel, *irelend; + Elf_Internal_Rela *irelalign; + bfd_vma toaddr; + Elf32_External_Sym *esym, *esymend; + struct elf_link_hash_entry *sym_hash; + asection *o; + + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + extsyms = (Elf32_External_Sym *) symtab_hdr->contents; + + shndx = _bfd_elf_section_from_bfd_section (abfd, sec); + + contents = elf_section_data (sec)->this_hdr.contents; + + /* The deletion must stop at the next ALIGN reloc for an aligment + power larger than the number of bytes we are deleting. */ + + irelalign = NULL; + toaddr = sec->_cooked_size; + + irel = elf_section_data (sec)->relocs; + irelend = irel + sec->reloc_count; + for (; irel < irelend; irel++) + { + if (ELF32_R_TYPE (irel->r_info) == (int) R_SH_ALIGN + && irel->r_offset > addr + && count < (1 << irel->r_addend)) + { + irelalign = irel; + toaddr = irel->r_offset; + break; + } + } + + /* Actually delete the bytes. */ + memmove (contents + addr, contents + addr + count, toaddr - addr - count); + if (irelalign == NULL) + sec->_cooked_size -= count; + else + { + int i; + +#define NOP_OPCODE (0x0009) + + BFD_ASSERT ((count & 1) == 0); + for (i = 0; i < count; i += 2) + bfd_put_16 (abfd, NOP_OPCODE, contents + toaddr - count + i); + } + + /* Adjust all the relocs. */ + for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) + { + bfd_vma nraddr, stop; + bfd_vma start = 0; + int insn = 0; + Elf_Internal_Sym sym; + int off, adjust, oinsn; + bfd_signed_vma voff = 0; + boolean overflow; + + /* Get the new reloc address. */ + nraddr = irel->r_offset; + if ((irel->r_offset > addr + && irel->r_offset < toaddr) + || (ELF32_R_TYPE (irel->r_info) == (int) R_SH_ALIGN + && irel->r_offset == toaddr)) + nraddr -= count; + + /* See if this reloc was for the bytes we have deleted, in which + case we no longer care about it. Don't delete relocs which + represent addresses, though. */ + if (irel->r_offset >= addr + && irel->r_offset < addr + count + && ELF32_R_TYPE (irel->r_info) != (int) R_SH_ALIGN + && ELF32_R_TYPE (irel->r_info) != (int) R_SH_CODE + && ELF32_R_TYPE (irel->r_info) != (int) R_SH_DATA + && ELF32_R_TYPE (irel->r_info) != (int) R_SH_LABEL) + irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), + (int) R_SH_NONE); + + /* If this is a PC relative reloc, see if the range it covers + includes the bytes we have deleted. */ + switch ((enum elf_sh_reloc_type) ELF32_R_TYPE (irel->r_info)) + { + default: + break; + + case R_SH_DIR8WPN: + case R_SH_IND12W: + case R_SH_DIR8WPZ: + case R_SH_DIR8WPL: + start = irel->r_offset; + insn = bfd_get_16 (abfd, contents + nraddr); + break; + } + + switch ((enum elf_sh_reloc_type) ELF32_R_TYPE (irel->r_info)) + { + default: + start = stop = addr; + break; + + case R_SH_DIR32: + /* If this reloc is against a symbol defined in this + section, and the symbol will not be adjusted below, we + must check the addend to see it will put the value in + range to be adjusted, and hence must be changed. */ + if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) + { + bfd_elf32_swap_symbol_in (abfd, + extsyms + ELF32_R_SYM (irel->r_info), + &sym); + if (sym.st_shndx == shndx + && (sym.st_value <= addr + || sym.st_value >= toaddr)) + { + bfd_vma val; + + val = bfd_get_32 (abfd, contents + nraddr); + val += sym.st_value; + if (val > addr && val < toaddr) + bfd_put_32 (abfd, val - count, contents + nraddr); + } + } + start = stop = addr; + break; + + case R_SH_DIR8WPN: + off = insn & 0xff; + if (off & 0x80) + off -= 0x100; + stop = (bfd_vma) ((bfd_signed_vma) start + 4 + off * 2); + break; + + case R_SH_IND12W: + if (ELF32_R_SYM (irel->r_info) >= symtab_hdr->sh_info) + start = stop = addr; + else + { + off = insn & 0xfff; + if (off & 0x800) + off -= 0x1000; + stop = (bfd_vma) ((bfd_signed_vma) start + 4 + off * 2); + } + break; + + case R_SH_DIR8WPZ: + off = insn & 0xff; + stop = start + 4 + off * 2; + break; + + case R_SH_DIR8WPL: + off = insn & 0xff; + stop = (start &~ (bfd_vma) 3) + 4 + off * 4; + break; + + case R_SH_SWITCH8: + case R_SH_SWITCH16: + case R_SH_SWITCH32: + /* These relocs types represent + .word L2-L1 + The r_offset field holds the difference between the reloc + address and L1. That is the start of the reloc, and + adding in the contents gives us the top. We must adjust + both the r_offset field and the section contents. */ + + start = irel->r_offset; + stop = (bfd_vma) ((bfd_signed_vma) start - (long) irel->r_addend); + + if (start > addr + && start < toaddr + && (stop <= addr || stop >= toaddr)) + irel->r_addend += count; + else if (stop > addr + && stop < toaddr + && (start <= addr || start >= toaddr)) + irel->r_addend -= count; + + start = stop; + + if (ELF32_R_TYPE (irel->r_info) == (int) R_SH_SWITCH16) + voff = bfd_get_signed_16 (abfd, contents + nraddr); + else if (ELF32_R_TYPE (irel->r_info) == (int) R_SH_SWITCH8) + voff = bfd_get_8 (abfd, contents + nraddr); + else + voff = bfd_get_signed_32 (abfd, contents + nraddr); + stop = (bfd_vma) ((bfd_signed_vma) start + voff); + + break; + + case R_SH_USES: + start = irel->r_offset; + stop = (bfd_vma) ((bfd_signed_vma) start + + (long) irel->r_addend + + 4); + break; + } + + if (start > addr + && start < toaddr + && (stop <= addr || stop >= toaddr)) + adjust = count; + else if (stop > addr + && stop < toaddr + && (start <= addr || start >= toaddr)) + adjust = - count; + else + adjust = 0; + + if (adjust != 0) + { + oinsn = insn; + overflow = false; + switch ((enum elf_sh_reloc_type) ELF32_R_TYPE (irel->r_info)) + { + default: + abort (); + break; + + case R_SH_DIR8WPN: + case R_SH_DIR8WPZ: + insn += adjust / 2; + if ((oinsn & 0xff00) != (insn & 0xff00)) + overflow = true; + bfd_put_16 (abfd, insn, contents + nraddr); + break; + + case R_SH_IND12W: + insn += adjust / 2; + if ((oinsn & 0xf000) != (insn & 0xf000)) + overflow = true; + bfd_put_16 (abfd, insn, contents + nraddr); + break; + + case R_SH_DIR8WPL: + BFD_ASSERT (adjust == count || count >= 4); + if (count >= 4) + insn += adjust / 4; + else + { + if ((irel->r_offset & 3) == 0) + ++insn; + } + if ((oinsn & 0xff00) != (insn & 0xff00)) + overflow = true; + bfd_put_16 (abfd, insn, contents + nraddr); + break; + + case R_SH_SWITCH16: + voff += adjust; + if (voff < - 0x8000 || voff >= 0x8000) + overflow = true; + bfd_put_signed_16 (abfd, voff, contents + nraddr); + break; + + case R_SH_SWITCH32: + voff += adjust; + bfd_put_signed_32 (abfd, voff, contents + nraddr); + break; + + case R_SH_USES: + irel->r_addend += adjust; + break; + } + + if (overflow) + { + ((*_bfd_error_handler) + (_("%s: 0x%lx: fatal: reloc overflow while relaxing"), + bfd_get_filename (abfd), (unsigned long) irel->r_offset)); + bfd_set_error (bfd_error_bad_value); + return false; + } + } + + irel->r_offset = nraddr; + } + + /* Look through all the other sections. If there contain any IMM32 + relocs against internal symbols which we are not going to adjust + below, we may need to adjust the addends. */ + for (o = abfd->sections; o != NULL; o = o->next) + { + Elf_Internal_Rela *internal_relocs; + Elf_Internal_Rela *irelscan, *irelscanend; + bfd_byte *ocontents; + + if (o == sec + || (o->flags & SEC_RELOC) == 0 + || o->reloc_count == 0) + continue; + + /* We always cache the relocs. Perhaps, if info->keep_memory is + false, we should free them, if we are permitted to, when we + leave sh_coff_relax_section. */ + internal_relocs = (_bfd_elf32_link_read_relocs + (abfd, o, (PTR) NULL, (Elf_Internal_Rela *) NULL, + true)); + if (internal_relocs == NULL) + return false; + + ocontents = NULL; + irelscanend = internal_relocs + o->reloc_count; + for (irelscan = internal_relocs; irelscan < irelscanend; irelscan++) + { + Elf_Internal_Sym sym; + + if (ELF32_R_TYPE (irelscan->r_info) != (int) R_SH_DIR32) + continue; + + if (ELF32_R_SYM (irelscan->r_info) >= symtab_hdr->sh_info) + continue; + + bfd_elf32_swap_symbol_in (abfd, + extsyms + ELF32_R_SYM (irelscan->r_info), + &sym); + + if (sym.st_shndx == shndx + && (sym.st_value <= addr + || sym.st_value >= toaddr)) + { + bfd_vma val; + + if (ocontents == NULL) + { + if (elf_section_data (o)->this_hdr.contents != NULL) + ocontents = elf_section_data (o)->this_hdr.contents; + else + { + /* We always cache the section contents. + Perhaps, if info->keep_memory is false, we + should free them, if we are permitted to, + when we leave sh_coff_relax_section. */ + ocontents = (bfd_byte *) bfd_malloc (o->_raw_size); + if (ocontents == NULL) + return false; + if (! bfd_get_section_contents (abfd, o, ocontents, + (file_ptr) 0, + o->_raw_size)) + return false; + elf_section_data (o)->this_hdr.contents = ocontents; + } + } + + val = bfd_get_32 (abfd, ocontents + irelscan->r_offset); + val += sym.st_value; + if (val > addr && val < toaddr) + bfd_put_32 (abfd, val - count, + ocontents + irelscan->r_offset); + } + } + } + + /* Adjust the local symbols defined in this section. */ + esym = extsyms; + esymend = esym + symtab_hdr->sh_info; + for (; esym < esymend; esym++) + { + Elf_Internal_Sym isym; + + bfd_elf32_swap_symbol_in (abfd, esym, &isym); + + if (isym.st_shndx == shndx + && isym.st_value > addr + && isym.st_value < toaddr) + { + isym.st_value -= count; + bfd_elf32_swap_symbol_out (abfd, &isym, esym); + } + } + + /* Now adjust the global symbols defined in this section. */ + esym = extsyms + symtab_hdr->sh_info; + esymend = extsyms + (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)); + for (index = 0; esym < esymend; esym++, index++) + { + Elf_Internal_Sym isym; + + bfd_elf32_swap_symbol_in (abfd, esym, &isym); + sym_hash = elf_sym_hashes (abfd)[index]; + if (isym.st_shndx == shndx + && ((sym_hash)->root.type == bfd_link_hash_defined + || (sym_hash)->root.type == bfd_link_hash_defweak) + && (sym_hash)->root.u.def.section == sec + && (sym_hash)->root.u.def.value > addr + && (sym_hash)->root.u.def.value < toaddr) + { + (sym_hash)->root.u.def.value -= count; + } + } + + /* See if we can move the ALIGN reloc forward. We have adjusted + r_offset for it already. */ + if (irelalign != NULL) + { + bfd_vma alignto, alignaddr; + + alignto = BFD_ALIGN (toaddr, 1 << irelalign->r_addend); + alignaddr = BFD_ALIGN (irelalign->r_offset, + 1 << irelalign->r_addend); + if (alignto != alignaddr) + { + /* Tail recursion. */ + return sh_elf_relax_delete_bytes (abfd, sec, alignaddr, + alignto - alignaddr); + } + } + + return true; +} + +/* Look for loads and stores which we can align to four byte + boundaries. This is like sh_align_loads in coff-sh.c. */ + +static boolean +sh_elf_align_loads (abfd, sec, internal_relocs, contents, pswapped) + bfd *abfd; + asection *sec; + Elf_Internal_Rela *internal_relocs; + bfd_byte *contents; + boolean *pswapped; +{ + Elf_Internal_Rela *irel, *irelend; + bfd_vma *labels = NULL; + bfd_vma *label, *label_end; + + *pswapped = false; + + irelend = internal_relocs + sec->reloc_count; + + /* Get all the addresses with labels on them. */ + labels = (bfd_vma *) bfd_malloc (sec->reloc_count * sizeof (bfd_vma)); + if (labels == NULL) + goto error_return; + label_end = labels; + for (irel = internal_relocs; irel < irelend; irel++) + { + if (ELF32_R_TYPE (irel->r_info) == (int) R_SH_LABEL) + { + *label_end = irel->r_offset; + ++label_end; + } + } + + /* Note that the assembler currently always outputs relocs in + address order. If that ever changes, this code will need to sort + the label values and the relocs. */ + + label = labels; + + for (irel = internal_relocs; irel < irelend; irel++) + { + bfd_vma start, stop; + + if (ELF32_R_TYPE (irel->r_info) != (int) R_SH_CODE) + continue; + + start = irel->r_offset; + + for (irel++; irel < irelend; irel++) + if (ELF32_R_TYPE (irel->r_info) == (int) R_SH_DATA) + break; + if (irel < irelend) + stop = irel->r_offset; + else + stop = sec->_cooked_size; + + if (! _bfd_sh_align_load_span (abfd, sec, contents, sh_elf_swap_insns, + (PTR) internal_relocs, &label, + label_end, start, stop, pswapped)) + goto error_return; + } + + free (labels); + + return true; + + error_return: + if (labels != NULL) + free (labels); + return false; +} + +/* Swap two SH instructions. This is like sh_swap_insns in coff-sh.c. */ + +static boolean +sh_elf_swap_insns (abfd, sec, relocs, contents, addr) + bfd *abfd; + asection *sec; + PTR relocs; + bfd_byte *contents; + bfd_vma addr; +{ + Elf_Internal_Rela *internal_relocs = (Elf_Internal_Rela *) relocs; + unsigned short i1, i2; + Elf_Internal_Rela *irel, *irelend; + + /* Swap the instructions themselves. */ + i1 = bfd_get_16 (abfd, contents + addr); + i2 = bfd_get_16 (abfd, contents + addr + 2); + bfd_put_16 (abfd, i2, contents + addr); + bfd_put_16 (abfd, i1, contents + addr + 2); + + /* Adjust all reloc addresses. */ + irelend = internal_relocs + sec->reloc_count; + for (irel = internal_relocs; irel < irelend; irel++) + { + enum elf_sh_reloc_type type; + int add; + + /* There are a few special types of relocs that we don't want to + adjust. These relocs do not apply to the instruction itself, + but are only associated with the address. */ + type = (enum elf_sh_reloc_type) ELF32_R_TYPE (irel->r_info); + if (type == R_SH_ALIGN + || type == R_SH_CODE + || type == R_SH_DATA + || type == R_SH_LABEL) + continue; + + /* If an R_SH_USES reloc points to one of the addresses being + swapped, we must adjust it. It would be incorrect to do this + for a jump, though, since we want to execute both + instructions after the jump. (We have avoided swapping + around a label, so the jump will not wind up executing an + instruction it shouldn't). */ + if (type == R_SH_USES) + { + bfd_vma off; + + off = irel->r_offset + 4 + irel->r_addend; + if (off == addr) + irel->r_offset += 2; + else if (off == addr + 2) + irel->r_offset -= 2; + } + + if (irel->r_offset == addr) + { + irel->r_offset += 2; + add = -2; + } + else if (irel->r_offset == addr + 2) + { + irel->r_offset -= 2; + add = 2; + } + else + add = 0; + + if (add != 0) + { + bfd_byte *loc; + unsigned short insn, oinsn; + boolean overflow; + + loc = contents + irel->r_offset; + overflow = false; + switch (type) + { + default: + break; + + case R_SH_DIR8WPN: + case R_SH_DIR8WPZ: + insn = bfd_get_16 (abfd, loc); + oinsn = insn; + insn += add / 2; + if ((oinsn & 0xff00) != (insn & 0xff00)) + overflow = true; + bfd_put_16 (abfd, insn, loc); + break; + + case R_SH_IND12W: + insn = bfd_get_16 (abfd, loc); + oinsn = insn; + insn += add / 2; + if ((oinsn & 0xf000) != (insn & 0xf000)) + overflow = true; + bfd_put_16 (abfd, insn, loc); + break; + + case R_SH_DIR8WPL: + /* This reloc ignores the least significant 3 bits of + the program counter before adding in the offset. + This means that if ADDR is at an even address, the + swap will not affect the offset. If ADDR is an at an + odd address, then the instruction will be crossing a + four byte boundary, and must be adjusted. */ + if ((addr & 3) != 0) + { + insn = bfd_get_16 (abfd, loc); + oinsn = insn; + insn += add / 2; + if ((oinsn & 0xff00) != (insn & 0xff00)) + overflow = true; + bfd_put_16 (abfd, insn, loc); + } + + break; + } + + if (overflow) + { + ((*_bfd_error_handler) + (_("%s: 0x%lx: fatal: reloc overflow while relaxing"), + bfd_get_filename (abfd), (unsigned long) irel->r_offset)); + bfd_set_error (bfd_error_bad_value); + return false; + } + } + } + + return true; +} + +/* Relocate an SH ELF section. */ + +static boolean +sh_elf_relocate_section (output_bfd, info, input_bfd, input_section, + contents, relocs, local_syms, local_sections) + 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; +{ + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + Elf_Internal_Rela *rel, *relend; + + symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (input_bfd); + + rel = relocs; + relend = relocs + input_section->reloc_count; + for (; rel < relend; rel++) + { + int r_type; + reloc_howto_type *howto; + unsigned long r_symndx; + Elf_Internal_Sym *sym; + asection *sec; + struct elf_link_hash_entry *h; + bfd_vma relocation; + bfd_vma addend = (bfd_vma)0; + bfd_reloc_status_type r; + + r_symndx = ELF32_R_SYM (rel->r_info); + + if (info->relocateable) + { + /* This is a relocateable link. We don't have to change + anything, unless the reloc is against a section symbol, + in which case we have to adjust according to where the + section symbol winds up in the output section. */ + if (r_symndx < symtab_hdr->sh_info) + { + sym = local_syms + r_symndx; + if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) + { + sec = local_sections[r_symndx]; + rel->r_addend += sec->output_offset + sym->st_value; + } + } + + continue; + } + + r_type = ELF32_R_TYPE (rel->r_info); + + /* Many of the relocs are only used for relaxing, and are + handled entirely by the relaxation code. */ + if (r_type > (int) R_SH_LAST_INVALID_RELOC) + continue; + + if (r_type < 0 + || r_type >= (int) R_SH_FIRST_INVALID_RELOC) + { + bfd_set_error (bfd_error_bad_value); + return false; + } + + /* FIXME: This is certainly incorrect. However, it is how the + COFF linker works. */ + if (r_type != (int) R_SH_DIR32 + && r_type != (int) R_SH_IND12W) + continue; + + howto = sh_elf_howto_table + r_type; + + /* This is a final link. */ + h = NULL; + sym = NULL; + sec = NULL; + if (r_symndx < symtab_hdr->sh_info) + { + /* There is nothing to be done for an internal IND12W + relocation. FIXME: This is probably wrong, but it's how + the COFF relocations work. */ + if (r_type == (int) R_SH_IND12W) + continue; + sym = local_syms + r_symndx; + sec = local_sections[r_symndx]; + relocation = (sec->output_section->vma + + sec->output_offset + + sym->st_value); + } + 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; + if (h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak) + { + sec = h->root.u.def.section; + relocation = (h->root.u.def.value + + sec->output_section->vma + + sec->output_offset); + } + else if (h->root.type == bfd_link_hash_undefweak) + relocation = 0; + else + { + if (! ((*info->callbacks->undefined_symbol) + (info, h->root.root.string, input_bfd, + input_section, rel->r_offset))) + return false; + relocation = 0; + } + } + + /* FIXME: This is how the COFF relocations work. */ + if (r_type == (int) R_SH_IND12W) + relocation -= 4; + + switch ((int)r_type) + { + case (int)R_SH_DIR32: + addend = rel->r_addend; + break; + } + + /* COFF relocs don't use the addend. The addend is used for R_SH_DIR32 + to be compatible with other compilers. */ + r = _bfd_final_link_relocate (howto, input_bfd, input_section, + contents, rel->r_offset, + relocation, addend); + + if (r != bfd_reloc_ok) + { + switch (r) + { + default: + case bfd_reloc_outofrange: + abort (); + case bfd_reloc_overflow: + { + const char *name; + + if (h != NULL) + name = h->root.root.string; + else + { + name = (bfd_elf_string_from_elf_section + (input_bfd, symtab_hdr->sh_link, sym->st_name)); + if (name == NULL) + return false; + if (*name == '\0') + name = bfd_section_name (input_bfd, sec); + } + if (! ((*info->callbacks->reloc_overflow) + (info, name, howto->name, (bfd_vma) 0, + input_bfd, input_section, rel->r_offset))) + return false; + } + break; + } + } + } + + return true; +} + +/* This is a version of bfd_generic_get_relocated_section_contents + which uses sh_elf_relocate_section. */ + +static bfd_byte * +sh_elf_get_relocated_section_contents (output_bfd, link_info, link_order, + data, relocateable, symbols) + bfd *output_bfd; + struct bfd_link_info *link_info; + struct bfd_link_order *link_order; + bfd_byte *data; + boolean relocateable; + asymbol **symbols; +{ + Elf_Internal_Shdr *symtab_hdr; + asection *input_section = link_order->u.indirect.section; + bfd *input_bfd = input_section->owner; + asection **sections = NULL; + Elf_Internal_Rela *internal_relocs = NULL; + Elf32_External_Sym *external_syms = NULL; + Elf_Internal_Sym *internal_syms = NULL; + + /* We only need to handle the case of relaxing, or of having a + particular set of section contents, specially. */ + if (relocateable + || elf_section_data (input_section)->this_hdr.contents == NULL) + return bfd_generic_get_relocated_section_contents (output_bfd, link_info, + link_order, data, + relocateable, + symbols); + + symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; + + memcpy (data, elf_section_data (input_section)->this_hdr.contents, + input_section->_raw_size); + + if ((input_section->flags & SEC_RELOC) != 0 + && input_section->reloc_count > 0) + { + Elf_Internal_Sym *isymp; + asection **secpp; + Elf32_External_Sym *esym, *esymend; + + if (symtab_hdr->contents != NULL) + external_syms = (Elf32_External_Sym *) symtab_hdr->contents; + else + { + external_syms = ((Elf32_External_Sym *) + bfd_malloc (symtab_hdr->sh_info + * sizeof (Elf32_External_Sym))); + if (external_syms == NULL && symtab_hdr->sh_info > 0) + goto error_return; + if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0 + || (bfd_read (external_syms, sizeof (Elf32_External_Sym), + symtab_hdr->sh_info, input_bfd) + != (symtab_hdr->sh_info * sizeof (Elf32_External_Sym)))) + goto error_return; + } + + internal_relocs = (_bfd_elf32_link_read_relocs + (input_bfd, input_section, (PTR) NULL, + (Elf_Internal_Rela *) NULL, false)); + if (internal_relocs == NULL) + goto error_return; + + internal_syms = ((Elf_Internal_Sym *) + bfd_malloc (symtab_hdr->sh_info + * sizeof (Elf_Internal_Sym))); + if (internal_syms == NULL && symtab_hdr->sh_info > 0) + goto error_return; + + sections = (asection **) bfd_malloc (symtab_hdr->sh_info + * sizeof (asection *)); + if (sections == NULL && symtab_hdr->sh_info > 0) + goto error_return; + + isymp = internal_syms; + secpp = sections; + esym = external_syms; + esymend = esym + symtab_hdr->sh_info; + for (; esym < esymend; ++esym, ++isymp, ++secpp) + { + asection *isec; + + bfd_elf32_swap_symbol_in (input_bfd, esym, isymp); + + if (isymp->st_shndx == SHN_UNDEF) + isec = bfd_und_section_ptr; + else if (isymp->st_shndx > 0 && isymp->st_shndx < SHN_LORESERVE) + isec = bfd_section_from_elf_index (input_bfd, isymp->st_shndx); + else if (isymp->st_shndx == SHN_ABS) + isec = bfd_abs_section_ptr; + else if (isymp->st_shndx == SHN_COMMON) + isec = bfd_com_section_ptr; + else + { + /* Who knows? */ + isec = NULL; + } + + *secpp = isec; + } + + if (! sh_elf_relocate_section (output_bfd, link_info, input_bfd, + input_section, data, internal_relocs, + internal_syms, sections)) + goto error_return; + + if (sections != NULL) + free (sections); + sections = NULL; + if (internal_syms != NULL) + free (internal_syms); + internal_syms = NULL; + if (external_syms != NULL && symtab_hdr->contents == NULL) + free (external_syms); + external_syms = NULL; + if (internal_relocs != elf_section_data (input_section)->relocs) + free (internal_relocs); + internal_relocs = NULL; + } + + return data; + + error_return: + if (internal_relocs != NULL + && internal_relocs != elf_section_data (input_section)->relocs) + free (internal_relocs); + if (external_syms != NULL && symtab_hdr->contents == NULL) + free (external_syms); + if (internal_syms != NULL) + free (internal_syms); + if (sections != NULL) + free (sections); + return NULL; +} +static asection * +sh_elf_gc_mark_hook (abfd, info, rel, h, sym) + bfd *abfd; + 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_SH_GNU_VTINHERIT: + case R_SH_GNU_VTENTRY: + break; + + default: + switch (h->root.type) + { + case bfd_link_hash_defined: + case bfd_link_hash_defweak: + return h->root.u.def.section; + + case bfd_link_hash_common: + return h->root.u.c.p->section; + } + } + } + else + { + if (!(elf_bad_symtab (abfd) + && ELF_ST_BIND (sym->st_info) != STB_LOCAL) + && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) + && sym->st_shndx != SHN_COMMON)) + { + return bfd_section_from_elf_index (abfd, sym->st_shndx); + } + } + return NULL; +} + +static boolean +sh_elf_gc_sweep_hook (abfd, info, sec, relocs) + bfd *abfd; + struct bfd_link_info *info; + asection *sec; + const Elf_Internal_Rela *relocs; +{ + /* we don't use got and plt entries for sh. */ + return true; +} + +/* 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 boolean +sh_elf_check_relocs (abfd, info, sec, relocs) + bfd *abfd; + struct bfd_link_info *info; + asection *sec; + const Elf_Internal_Rela *relocs; +{ + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; + const Elf_Internal_Rela *rel; + const Elf_Internal_Rela *rel_end; + + if (info->relocateable) + 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; + + 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]; + + switch (ELF32_R_TYPE (rel->r_info)) + { + /* This relocation describes the C++ object vtable hierarchy. + Reconstruct it for later use during GC. */ + case R_SH_GNU_VTINHERIT: + if (!_bfd_elf32_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_SH_GNU_VTENTRY: + if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) + return false; + break; + } + } + + return true; +} + +#define TARGET_BIG_SYM bfd_elf32_sh_vec +#define TARGET_BIG_NAME "elf32-sh" +#define TARGET_LITTLE_SYM bfd_elf32_shl_vec +#define TARGET_LITTLE_NAME "elf32-shl" +#define ELF_ARCH bfd_arch_sh +#define ELF_MACHINE_CODE EM_SH +#define ELF_MAXPAGESIZE 0x1 + +#define elf_symbol_leading_char '_' + +#define bfd_elf32_bfd_reloc_type_lookup sh_elf_reloc_type_lookup +#define elf_info_to_howto sh_elf_info_to_howto +#define bfd_elf32_bfd_relax_section sh_elf_relax_section +#define elf_backend_relocate_section sh_elf_relocate_section +#define bfd_elf32_bfd_get_relocated_section_contents \ + sh_elf_get_relocated_section_contents + +#define elf_backend_gc_mark_hook sh_elf_gc_mark_hook +#define elf_backend_gc_sweep_hook sh_elf_gc_sweep_hook +#define elf_backend_check_relocs sh_elf_check_relocs + +#define elf_backend_can_gc_sections 1 +#include "elf32-target.h" |