diff options
Diffstat (limited to 'bfd/elf32-m32r.c')
| -rw-r--r-- | bfd/elf32-m32r.c | 2082 |
1 files changed, 2082 insertions, 0 deletions
diff --git a/bfd/elf32-m32r.c b/bfd/elf32-m32r.c new file mode 100644 index 00000000000..b2f852370e9 --- /dev/null +++ b/bfd/elf32-m32r.c @@ -0,0 +1,2082 @@ +/* M32R-specific support for 32-bit ELF. + Copyright (C) 1996, 1997, 1998, 1999 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 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 "libbfd.h" +#include "elf-bfd.h" +#include "elf/m32r.h" + +static bfd_reloc_status_type m32r_elf_10_pcrel_reloc + PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); +static bfd_reloc_status_type m32r_elf_do_10_pcrel_reloc + PARAMS ((bfd *, reloc_howto_type *, asection *, + bfd_byte *, bfd_vma, asection *, bfd_vma, bfd_vma)); +static bfd_reloc_status_type m32r_elf_hi16_reloc + PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); +static void m32r_elf_relocate_hi16 + PARAMS ((bfd *, int, Elf_Internal_Rela *, Elf_Internal_Rela *, + bfd_byte *, bfd_vma)); +bfd_reloc_status_type m32r_elf_lo16_reloc + PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); +static bfd_reloc_status_type m32r_elf_sda16_reloc + PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); +static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup + PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); +static void m32r_info_to_howto_rel + PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); +boolean _bfd_m32r_elf_section_from_bfd_section + PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *, int *)); +void _bfd_m32r_elf_symbol_processing + PARAMS ((bfd *, asymbol *)); +static boolean m32r_elf_add_symbol_hook + PARAMS ((bfd *, struct bfd_link_info *, const Elf_Internal_Sym *, + const char **, flagword *, asection **, bfd_vma *)); +static boolean m32r_elf_relocate_section + PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, + Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); +#if 0 /* not yet */ +static boolean m32r_elf_relax_delete_bytes + PARAMS ((bfd *, asection *, bfd_vma, int)); +#endif + +static bfd_reloc_status_type m32r_elf_final_sda_base + PARAMS ((bfd *, struct bfd_link_info *, const char **, bfd_vma *)); +static boolean m32r_elf_object_p + PARAMS ((bfd *)); +static void m32r_elf_final_write_processing + PARAMS ((bfd *, boolean)); +static boolean m32r_elf_set_private_flags + PARAMS ((bfd *, flagword)); +static boolean m32r_elf_copy_private_bfd_data + PARAMS ((bfd *, bfd *)); +static boolean m32r_elf_merge_private_bfd_data + PARAMS ((bfd *, bfd *)); +static boolean m32r_elf_print_private_bfd_data + PARAMS ((bfd *, PTR)); + +#define NOP_INSN 0x7000 +#define MAKE_PARALLEL(insn) ((insn) | 0x8000) + +/* Use REL instead of RELA to save space. + This only saves space in libraries and object files, but perhaps + relocs will be put in ROM? All in all though, REL relocs are a pain + to work with. */ +#define USE_REL + +static reloc_howto_type m32r_elf_howto_table[] = +{ + /* This reloc does nothing. */ + HOWTO (R_M32R_NONE, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_M32R_NONE", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + false), /* pcrel_offset */ + + /* A 16 bit absolute relocation. */ + HOWTO (R_M32R_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_M32R_16", /* name */ + true, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* A 32 bit absolute relocation. */ + HOWTO (R_M32R_32, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_M32R_32", /* name */ + true, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* A 24 bit address. */ + HOWTO (R_M32R_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 */ + bfd_elf_generic_reloc, /* special_function */ + "R_M32R_24", /* name */ + true, /* partial_inplace */ + 0xffffff, /* src_mask */ + 0xffffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* An PC Relative 10-bit relocation, shifted by 2. + This reloc is complicated because relocations are relative to pc & -4. + i.e. branches in the right insn slot use the address of the left insn + slot for pc. */ + /* ??? It's not clear whether this should have partial_inplace set or not. + Branch relaxing in the assembler can store the addend in the insn, + and if bfd_install_relocation gets called the addend may get added + again. */ + HOWTO (R_M32R_10_PCREL, /* type */ + 2, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 10, /* bitsize */ + true, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + m32r_elf_10_pcrel_reloc, /* special_function */ + "R_M32R_10_PCREL", /* name */ + false, /* partial_inplace */ + 0xff, /* src_mask */ + 0xff, /* dst_mask */ + true), /* pcrel_offset */ + + /* A relative 18 bit relocation, right shifted by 2. */ + HOWTO (R_M32R_18_PCREL, /* type */ + 2, /* rightshift */ + 2, /* 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_M32R_18_PCREL", /* name */ + false, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + true), /* pcrel_offset */ + + /* A relative 26 bit relocation, right shifted by 2. */ + /* ??? It's not clear whether this should have partial_inplace set or not. + Branch relaxing in the assembler can store the addend in the insn, + and if bfd_install_relocation gets called the addend may get added + again. */ + HOWTO (R_M32R_26_PCREL, /* type */ + 2, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 26, /* bitsize */ + true, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_M32R_26_PCREL", /* name */ + false, /* partial_inplace */ + 0xffffff, /* src_mask */ + 0xffffff, /* dst_mask */ + true), /* pcrel_offset */ + + /* High 16 bits of address when lower 16 is or'd in. */ + HOWTO (R_M32R_HI16_ULO, /* type */ + 16, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + m32r_elf_hi16_reloc, /* special_function */ + "R_M32R_HI16_ULO", /* name */ + true, /* partial_inplace */ + 0x0000ffff, /* src_mask */ + 0x0000ffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* High 16 bits of address when lower 16 is added in. */ + HOWTO (R_M32R_HI16_SLO, /* type */ + 16, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + m32r_elf_hi16_reloc, /* special_function */ + "R_M32R_HI16_SLO", /* name */ + true, /* partial_inplace */ + 0x0000ffff, /* src_mask */ + 0x0000ffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* Lower 16 bits of address. */ + HOWTO (R_M32R_LO16, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + m32r_elf_lo16_reloc, /* special_function */ + "R_M32R_LO16", /* name */ + true, /* partial_inplace */ + 0x0000ffff, /* src_mask */ + 0x0000ffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* Small data area 16 bits offset. */ + HOWTO (R_M32R_SDA16, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + m32r_elf_sda16_reloc, /* special_function */ + "R_M32R_SDA16", /* name */ + true, /* partial_inplace */ /* FIXME: correct? */ + 0x0000ffff, /* src_mask */ + 0x0000ffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* GNU extension to record C++ vtable hierarchy */ + HOWTO (R_M32R_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_M32R_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_M32R_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_M32R_GNU_VTENTRY", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + false), /* pcrel_offset */ + +}; + +/* Handle the R_M32R_10_PCREL reloc. */ + +static bfd_reloc_status_type +m32r_elf_10_pcrel_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; +{ + /* This part is from bfd_elf_generic_reloc. */ + if (output_bfd != (bfd *) NULL + && (symbol->flags & BSF_SECTION_SYM) == 0 + && (! reloc_entry->howto->partial_inplace + || reloc_entry->addend == 0)) + { + reloc_entry->address += input_section->output_offset; + return bfd_reloc_ok; + } + + if (output_bfd != NULL) + { + /* FIXME: See bfd_perform_relocation. Is this right? */ + return bfd_reloc_continue; + } + + return m32r_elf_do_10_pcrel_reloc (abfd, reloc_entry->howto, + input_section, + data, reloc_entry->address, + symbol->section, + (symbol->value + + symbol->section->output_section->vma + + symbol->section->output_offset), + reloc_entry->addend); +} + +/* Utility to actually perform an R_M32R_10_PCREL reloc. */ + +static bfd_reloc_status_type +m32r_elf_do_10_pcrel_reloc (abfd, howto, input_section, data, offset, + symbol_section, symbol_value, addend) + bfd *abfd; + reloc_howto_type *howto; + asection *input_section; + bfd_byte *data; + bfd_vma offset; + asection *symbol_section; + bfd_vma symbol_value; + bfd_vma addend; +{ + bfd_signed_vma relocation; + unsigned long x; + bfd_reloc_status_type status; + + /* Sanity check the address (offset in section). */ + if (offset > input_section->_cooked_size) + return bfd_reloc_outofrange; + + relocation = symbol_value + addend; + /* Make it pc relative. */ + relocation -= (input_section->output_section->vma + + input_section->output_offset); + /* These jumps mask off the lower two bits of the current address + before doing pcrel calculations. */ + relocation -= (offset & -4L); + + if (relocation < -0x200 || relocation > 0x1ff) + status = bfd_reloc_overflow; + else + status = bfd_reloc_ok; + + x = bfd_get_16 (abfd, data + offset); + relocation >>= howto->rightshift; + relocation <<= howto->bitpos; + x = (x & ~howto->dst_mask) | (((x & howto->src_mask) + relocation) & howto->dst_mask); + bfd_put_16 (abfd, x, data + offset); + + return status; +} + +/* Handle the R_M32R_HI16_[SU]LO relocs. + HI16_SLO is for the add3 and load/store with displacement instructions. + HI16_ULO is for the or3 instruction. + For R_M32R_HI16_SLO, the lower 16 bits are sign extended when added to + the high 16 bytes so if the lower 16 bits are negative (bit 15 == 1) then + we must add one to the high 16 bytes (which will get subtracted off when + the low 16 bits are added). + These relocs have to be done in combination with an R_M32R_LO16 reloc + because there is a carry from the LO16 to the HI16. Here we just save + the information we need; we do the actual relocation when we see the LO16. + This code is copied from the elf32-mips.c. We also support an arbitrary + number of HI16 relocs to be associated with a single LO16 reloc. The + assembler sorts the relocs to ensure each HI16 immediately precedes its + LO16. However if there are multiple copies, the assembler may not find + the real LO16 so it picks the first one it finds. */ + +struct m32r_hi16 +{ + struct m32r_hi16 *next; + bfd_byte *addr; + bfd_vma addend; +}; + +/* FIXME: This should not be a static variable. */ + +static struct m32r_hi16 *m32r_hi16_list; + +static bfd_reloc_status_type +m32r_elf_hi16_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; +{ + bfd_reloc_status_type ret; + bfd_vma relocation; + struct m32r_hi16 *n; + + /* This part is from bfd_elf_generic_reloc. + If we're relocating, and this an external symbol, we don't want + to change anything. */ + if (output_bfd != (bfd *) NULL + && (symbol->flags & BSF_SECTION_SYM) == 0 + && reloc_entry->addend == 0) + { + reloc_entry->address += input_section->output_offset; + return bfd_reloc_ok; + } + + /* Sanity check the address (offset in section). */ + if (reloc_entry->address > input_section->_cooked_size) + return bfd_reloc_outofrange; + + ret = bfd_reloc_ok; + if (bfd_is_und_section (symbol->section) + && output_bfd == (bfd *) NULL) + ret = bfd_reloc_undefined; + + 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; + + /* Save the information, and let LO16 do the actual relocation. */ + n = (struct m32r_hi16 *) bfd_malloc (sizeof *n); + if (n == NULL) + return bfd_reloc_outofrange; + n->addr = (bfd_byte *) data + reloc_entry->address; + n->addend = relocation; + n->next = m32r_hi16_list; + m32r_hi16_list = n; + + if (output_bfd != (bfd *) NULL) + reloc_entry->address += input_section->output_offset; + + return ret; +} + +/* Handle an M32R ELF HI16 reloc. */ + +static void +m32r_elf_relocate_hi16 (input_bfd, type, relhi, rello, contents, addend) + bfd *input_bfd; + int type; + Elf_Internal_Rela *relhi; + Elf_Internal_Rela *rello; + bfd_byte *contents; + bfd_vma addend; +{ + unsigned long insn; + bfd_vma addlo; + + insn = bfd_get_32 (input_bfd, contents + relhi->r_offset); + + addlo = bfd_get_32 (input_bfd, contents + rello->r_offset); + if (type == R_M32R_HI16_SLO) + addlo = ((addlo & 0xffff) ^ 0x8000) - 0x8000; + else + addlo &= 0xffff; + + addend += ((insn & 0xffff) << 16) + addlo; + + /* Reaccount for sign extension of low part. */ + if (type == R_M32R_HI16_SLO + && (addend & 0x8000) != 0) + addend += 0x10000; + + bfd_put_32 (input_bfd, + (insn & 0xffff0000) | ((addend >> 16) & 0xffff), + contents + relhi->r_offset); +} + +/* Do an R_M32R_LO16 relocation. This is a straightforward 16 bit + inplace relocation; this function exists in order to do the + R_M32R_HI16_[SU]LO relocation described above. */ + +bfd_reloc_status_type +m32r_elf_lo16_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 (m32r_hi16_list != NULL) + { + struct m32r_hi16 *l; + + l = m32r_hi16_list; + while (l != NULL) + { + unsigned long insn; + unsigned long val; + unsigned long vallo; + struct m32r_hi16 *next; + + /* Do the HI16 relocation. Note that we actually don't need + to know anything about the LO16 itself, except where to + find the low 16 bits of the addend needed by the LO16. */ + insn = bfd_get_32 (abfd, l->addr); + vallo = ((bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address) + & 0xffff) ^ 0x8000) - 0x8000; + val = ((insn & 0xffff) << 16) + vallo; + val += l->addend; + + /* Reaccount for sign extension of low part. */ + if ((val & 0x8000) != 0) + val += 0x10000; + + insn = (insn &~ 0xffff) | ((val >> 16) & 0xffff); + bfd_put_32 (abfd, insn, l->addr); + + next = l->next; + free (l); + l = next; + } + + m32r_hi16_list = NULL; + } + + /* Now do the LO16 reloc in the usual way. */ + return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, + input_section, output_bfd, error_message); +} + +/* Handle the R_M32R_SDA16 reloc. + This reloc is used to compute the address of objects in the small data area + and to perform loads and stores from that area. + The lower 16 bits are sign extended and added to the register specified + in the instruction, which is assumed to point to _SDA_BASE_. */ + +static bfd_reloc_status_type +m32r_elf_sda16_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; +{ + /* This part is from bfd_elf_generic_reloc. */ + if (output_bfd != (bfd *) NULL + && (symbol->flags & BSF_SECTION_SYM) == 0 + && (! reloc_entry->howto->partial_inplace + || reloc_entry->addend == 0)) + { + reloc_entry->address += input_section->output_offset; + return bfd_reloc_ok; + } + + if (output_bfd != NULL) + { + /* FIXME: See bfd_perform_relocation. Is this right? */ + return bfd_reloc_continue; + } + + /* FIXME: not sure what to do here yet. But then again, the linker + may never call us. */ + abort (); +} + +/* Map BFD reloc types to M32R ELF reloc types. */ + +struct m32r_reloc_map +{ + bfd_reloc_code_real_type bfd_reloc_val; + unsigned char elf_reloc_val; +}; + +static const struct m32r_reloc_map m32r_reloc_map[] = +{ + { BFD_RELOC_NONE, R_M32R_NONE }, + { BFD_RELOC_16, R_M32R_16 }, + { BFD_RELOC_32, R_M32R_32 }, + { BFD_RELOC_M32R_24, R_M32R_24 }, + { BFD_RELOC_M32R_10_PCREL, R_M32R_10_PCREL }, + { BFD_RELOC_M32R_18_PCREL, R_M32R_18_PCREL }, + { BFD_RELOC_M32R_26_PCREL, R_M32R_26_PCREL }, + { BFD_RELOC_M32R_HI16_ULO, R_M32R_HI16_ULO }, + { BFD_RELOC_M32R_HI16_SLO, R_M32R_HI16_SLO }, + { BFD_RELOC_M32R_LO16, R_M32R_LO16 }, + { BFD_RELOC_M32R_SDA16, R_M32R_SDA16 }, + { BFD_RELOC_VTABLE_INHERIT, R_M32R_GNU_VTINHERIT }, + { BFD_RELOC_VTABLE_ENTRY, R_M32R_GNU_VTENTRY }, +}; + +static reloc_howto_type * +bfd_elf32_bfd_reloc_type_lookup (abfd, code) + bfd *abfd; + bfd_reloc_code_real_type code; +{ + unsigned int i; + + for (i = 0; + i < sizeof (m32r_reloc_map) / sizeof (struct m32r_reloc_map); + i++) + { + if (m32r_reloc_map[i].bfd_reloc_val == code) + return &m32r_elf_howto_table[m32r_reloc_map[i].elf_reloc_val]; + } + + return NULL; +} + +/* Set the howto pointer for an M32R ELF reloc. */ + +static void +m32r_info_to_howto_rel (abfd, cache_ptr, dst) + bfd *abfd; + arelent *cache_ptr; + Elf32_Internal_Rel *dst; +{ + unsigned int r_type; + + r_type = ELF32_R_TYPE (dst->r_info); + BFD_ASSERT (r_type < (unsigned int) R_M32R_max); + cache_ptr->howto = &m32r_elf_howto_table[r_type]; +} + +/* Given a BFD section, try to locate the corresponding ELF section + index. */ + +boolean +_bfd_m32r_elf_section_from_bfd_section (abfd, hdr, sec, retval) + bfd *abfd; + Elf32_Internal_Shdr *hdr; + asection *sec; + int *retval; +{ + if (strcmp (bfd_get_section_name (abfd, sec), ".scommon") == 0) + { + *retval = SHN_M32R_SCOMMON; + return true; + } + return false; +} + +/* M32R ELF uses two common sections. One is the usual one, and the other + is for small objects. All the small objects are kept together, and then + referenced via one register, which yields faster assembler code. It is + up to the compiler to emit an instruction to load the register with + _SDA_BASE. This is what we use for the small common section. This + approach is copied from elf32-mips.c. */ +static asection m32r_elf_scom_section; +static asymbol m32r_elf_scom_symbol; +static asymbol *m32r_elf_scom_symbol_ptr; + +/* Handle the special M32R section numbers that a symbol may use. */ + +void +_bfd_m32r_elf_symbol_processing (abfd, asym) + bfd *abfd; + asymbol *asym; +{ + elf_symbol_type *elfsym; + + elfsym = (elf_symbol_type *) asym; + + switch (elfsym->internal_elf_sym.st_shndx) + { + case SHN_M32R_SCOMMON: + if (m32r_elf_scom_section.name == NULL) + { + /* Initialize the small common section. */ + m32r_elf_scom_section.name = ".scommon"; + m32r_elf_scom_section.flags = SEC_IS_COMMON; + m32r_elf_scom_section.output_section = &m32r_elf_scom_section; + m32r_elf_scom_section.symbol = &m32r_elf_scom_symbol; + m32r_elf_scom_section.symbol_ptr_ptr = &m32r_elf_scom_symbol_ptr; + m32r_elf_scom_symbol.name = ".scommon"; + m32r_elf_scom_symbol.flags = BSF_SECTION_SYM; + m32r_elf_scom_symbol.section = &m32r_elf_scom_section; + m32r_elf_scom_symbol_ptr = &m32r_elf_scom_symbol; + } + asym->section = &m32r_elf_scom_section; + asym->value = elfsym->internal_elf_sym.st_size; + break; + } +} + +/* Hook called by the linker routine which adds symbols from an object + file. We must handle the special M32R section numbers here. + We also keep watching for whether we need to create the sdata special + linker sections. */ + +static boolean +m32r_elf_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp) + bfd *abfd; + struct bfd_link_info *info; + const Elf_Internal_Sym *sym; + const char **namep; + flagword *flagsp; + asection **secp; + bfd_vma *valp; +{ + if (! info->relocateable + && (*namep)[0] == '_' && (*namep)[1] == 'S' + && strcmp (*namep, "_SDA_BASE_") == 0) + { + /* This is simpler than using _bfd_elf_create_linker_section + (our needs are simpler than ppc's needs). Also + _bfd_elf_create_linker_section currently has a bug where if a .sdata + section already exists a new one is created that follows it which + screws of _SDA_BASE_ address calcs because output_offset != 0. */ + struct elf_link_hash_entry *h; + asection *s = bfd_get_section_by_name (abfd, ".sdata"); + + /* The following code was cobbled from elf32-ppc.c and elflink.c. */ + + if (s == NULL) + { + int flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS + | SEC_IN_MEMORY | SEC_LINKER_CREATED); + + s = bfd_make_section_anyway (abfd, ".sdata"); + if (s == NULL) + return false; + bfd_set_section_flags (abfd, s, flags); + bfd_set_section_alignment (abfd, s, 2); + } + + h = (struct elf_link_hash_entry *) + bfd_link_hash_lookup (info->hash, "_SDA_BASE_", false, false, false); + + if ((h == NULL || h->root.type == bfd_link_hash_undefined) + && !(_bfd_generic_link_add_one_symbol (info, + abfd, + "_SDA_BASE_", + BSF_GLOBAL, + s, + 32768, + (const char *) NULL, + false, + get_elf_backend_data (abfd)->collect, + (struct bfd_link_hash_entry **) &h))) + return false; + h->type = STT_OBJECT; + } + + switch (sym->st_shndx) + { + case SHN_M32R_SCOMMON: + *secp = bfd_make_section_old_way (abfd, ".scommon"); + (*secp)->flags |= SEC_IS_COMMON; + *valp = sym->st_size; + break; + } + + return true; +} + +/* We have to figure out the SDA_BASE value, so that we can adjust the + symbol value correctly. We look up the symbol _SDA_BASE_ in the output + BFD. If we can't find it, we're stuck. We cache it in the ELF + target data. We don't need to adjust the symbol value for an + external symbol if we are producing relocateable output. */ + +static bfd_reloc_status_type +m32r_elf_final_sda_base (output_bfd, info, error_message, psb) + bfd *output_bfd; + struct bfd_link_info *info; + const char **error_message; + bfd_vma *psb; +{ + if (elf_gp (output_bfd) == 0) + { + struct bfd_link_hash_entry *h; + + h = bfd_link_hash_lookup (info->hash, "_SDA_BASE_", false, false, true); + if (h != (struct bfd_link_hash_entry *) NULL + && h->type == bfd_link_hash_defined) + elf_gp (output_bfd) = (h->u.def.value + + h->u.def.section->output_section->vma + + h->u.def.section->output_offset); + else + { + /* Only get the error once. */ + *psb = elf_gp (output_bfd) = 4; + *error_message = + (const char *) _("SDA relocation when _SDA_BASE_ not defined"); + return bfd_reloc_dangerous; + } + } + *psb = elf_gp (output_bfd); + return bfd_reloc_ok; +} + +/* Relocate an M32R/D ELF section. + There is some attempt to make this function usable for many architectures, + both USE_REL and USE_RELA ['twould be nice if such a critter existed], + if only to serve as a learning tool. + + 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 adjust the section contents as + necessary, and (if using Rela relocs and generating a + relocateable 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 relocateable 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 boolean +m32r_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 = &elf_tdata (input_bfd)->symtab_hdr; + struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd); + Elf_Internal_Rela *rel, *relend; + /* Assume success. */ + boolean ret = true; + + rel = relocs; + relend = relocs + input_section->reloc_count; + for (; rel < relend; rel++) + { + int r_type; + reloc_howto_type *howto; + unsigned long r_symndx; + /* We can't modify r_addend here as elf_link_input_bfd has an assert to + ensure it's zero (we use REL relocs, not RELA). Therefore this + should be assigning zero to `addend', but for clarity we use + `r_addend'. */ + bfd_vma addend = rel->r_addend; + bfd_vma offset = rel->r_offset; + struct elf_link_hash_entry *h; + Elf_Internal_Sym *sym; + asection *sec; + const char *sym_name; + bfd_reloc_status_type r; + const char *errmsg = NULL; + + h = NULL; + r_type = ELF32_R_TYPE (rel->r_info); + if (r_type < 0 || r_type >= (int) R_M32R_max) + { + (*_bfd_error_handler) (_("%s: unknown relocation type %d"), + bfd_get_filename (input_bfd), + (int) r_type); + bfd_set_error (bfd_error_bad_value); + ret = false; + continue; + } + + if (r_type == R_M32R_GNU_VTENTRY + || r_type == R_M32R_GNU_VTINHERIT) + continue; + + howto = m32r_elf_howto_table + r_type; + 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. */ + sec = NULL; + if (r_symndx >= symtab_hdr->sh_info) + { + /* External symbol. */ + continue; + } + + /* Local symbol. */ + sym = local_syms + r_symndx; + sym_name = "<local symbol>"; + /* STT_SECTION: symbol is associated with a section. */ + if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) + { + /* Symbol isn't associated with a section. Nothing to do. */ + continue; + } + + sec = local_sections[r_symndx]; + addend += sec->output_offset + sym->st_value; +#ifndef USE_REL + /* This can't be done for USE_REL because it doesn't mean anything + and elf_link_input_bfd asserts this stays zero. */ + rel->r_addend = addend; +#endif + +#ifndef USE_REL + /* Addends are stored with relocs. We're done. */ + continue; +#else /* USE_REL */ + /* If partial_inplace, we need to store any additional addend + back in the section. */ + if (! howto->partial_inplace) + continue; + /* ??? Here is a nice place to call a special_function + like handler. */ + if (r_type != R_M32R_HI16_SLO && r_type != R_M32R_HI16_ULO) + r = _bfd_relocate_contents (howto, input_bfd, + addend, contents + offset); + else + { + Elf_Internal_Rela *lorel; + + /* We allow an arbitrary number of HI16 relocs before the + LO16 reloc. This permits gcc to emit the HI and LO relocs + itself. */ + for (lorel = rel + 1; + (lorel < relend + && (ELF32_R_TYPE (lorel->r_info) == R_M32R_HI16_SLO + || ELF32_R_TYPE (lorel->r_info) == R_M32R_HI16_ULO)); + lorel++) + continue; + if (lorel < relend + && ELF32_R_TYPE (lorel->r_info) == R_M32R_LO16) + { + m32r_elf_relocate_hi16 (input_bfd, r_type, rel, lorel, + contents, addend); + r = bfd_reloc_ok; + } + else + r = _bfd_relocate_contents (howto, input_bfd, + addend, contents + offset); + } +#endif /* USE_REL */ + } + else + { + bfd_vma relocation; + + /* This is a final link. */ + sym = NULL; + sec = NULL; + + if (r_symndx < symtab_hdr->sh_info) + { + /* Local symbol. */ + sym = local_syms + r_symndx; + sec = local_sections[r_symndx]; + sym_name = "<local symbol>"; + relocation = (sec->output_section->vma + + sec->output_offset + + sym->st_value); + } + else + { + /* External symbol. */ + 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; + sym_name = h->root.root.string; + + if (h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak) + { + sec = h->root.u.def.section; + if (sec->output_section == NULL) + relocation = 0; + else + relocation = (h->root.u.def.value + + sec->output_section->vma + + sec->output_offset); + } + else if (h->root.type == bfd_link_hash_undefweak) + relocation = 0; + else + { + if (! ((*info->callbacks->undefined_symbol) + (info, h->root.root.string, input_bfd, + input_section, offset))) + return false; + relocation = 0; + } + } + + /* Sanity check the address. */ + if (offset > input_section->_raw_size) + { + r = bfd_reloc_outofrange; + goto check_reloc; + } + + switch ((int) r_type) + { + case (int) R_M32R_10_PCREL : + r = m32r_elf_do_10_pcrel_reloc (input_bfd, howto, input_section, + contents, offset, + sec, relocation, addend); + break; + + case (int) R_M32R_HI16_SLO : + case (int) R_M32R_HI16_ULO : + { + Elf_Internal_Rela *lorel; + + /* We allow an arbitrary number of HI16 relocs before the + LO16 reloc. This permits gcc to emit the HI and LO relocs + itself. */ + for (lorel = rel + 1; + (lorel < relend + && (ELF32_R_TYPE (lorel->r_info) == R_M32R_HI16_SLO + || ELF32_R_TYPE (lorel->r_info) == R_M32R_HI16_ULO)); + lorel++) + continue; + if (lorel < relend + && ELF32_R_TYPE (lorel->r_info) == R_M32R_LO16) + { + m32r_elf_relocate_hi16 (input_bfd, r_type, rel, lorel, + contents, relocation + addend); + r = bfd_reloc_ok; + } + else + r = _bfd_final_link_relocate (howto, input_bfd, input_section, + contents, offset, + relocation, addend); + } + break; + + case (int) R_M32R_SDA16 : + { + const char *name; + + BFD_ASSERT (sec != NULL); + name = bfd_get_section_name (abfd, sec); + + if (strcmp (name, ".sdata") == 0 + || strcmp (name, ".sbss") == 0 + || strcmp (name, ".scommon") == 0) + { + bfd_vma sda_base; + bfd *out_bfd = sec->output_section->owner; + + r = m32r_elf_final_sda_base (out_bfd, info, + &errmsg, + &sda_base); + if (r != bfd_reloc_ok) + { + ret = false; + goto check_reloc; + } + + /* At this point `relocation' contains the object's + address. */ + relocation -= sda_base; + /* Now it contains the offset from _SDA_BASE_. */ + } + else + { + (*_bfd_error_handler) (_("%s: The target (%s) of an %s relocation is in the wrong section (%s)"), + bfd_get_filename (input_bfd), + sym_name, + m32r_elf_howto_table[(int) r_type].name, + bfd_get_section_name (abfd, sec)); + /*bfd_set_error (bfd_error_bad_value); ??? why? */ + ret = false; + continue; + } + } + /* fall through */ + + default : + r = _bfd_final_link_relocate (howto, input_bfd, input_section, + contents, offset, + relocation, addend); + break; + } + } + + check_reloc: + + if (r != bfd_reloc_ok) + { + /* FIXME: This should be generic enough to go in a utility. */ + 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 || *name == '\0') + name = bfd_section_name (input_bfd, sec); + } + + if (errmsg != NULL) + goto common_error; + + switch (r) + { + case bfd_reloc_overflow: + if (! ((*info->callbacks->reloc_overflow) + (info, name, howto->name, (bfd_vma) 0, + input_bfd, input_section, offset))) + return false; + break; + + case bfd_reloc_undefined: + if (! ((*info->callbacks->undefined_symbol) + (info, name, input_bfd, input_section, + offset))) + return false; + break; + + case bfd_reloc_outofrange: + errmsg = _("internal error: out of range error"); + goto common_error; + + case bfd_reloc_notsupported: + errmsg = _("internal error: unsupported relocation error"); + goto common_error; + + case bfd_reloc_dangerous: + errmsg = _("internal error: dangerous error"); + goto common_error; + + default: + errmsg = _("internal error: unknown error"); + /* fall through */ + + common_error: + if (!((*info->callbacks->warning) + (info, errmsg, name, input_bfd, input_section, + offset))) + return false; + break; + } + } + } + + return ret; +} + +#if 0 /* relaxing not supported yet */ + +/* This function handles relaxing for the m32r. + Relaxing on the m32r is tricky because of instruction alignment + requirements (4 byte instructions must be aligned on 4 byte boundaries). + + The following relaxing opportunities are handled: + + seth/add3/jl -> bl24 or bl8 + seth/add3 -> ld24 + + It would be nice to handle bl24 -> bl8 but given: + + - 4 byte insns must be on 4 byte boundaries + - branch instructions only branch to insns on 4 byte boundaries + + this isn't much of a win because the insn in the 2 "deleted" bytes + must become a nop. With some complexity some real relaxation could be + done but the frequency just wouldn't make it worth it; it's better to + try to do all the code compaction one can elsewhere. + When the chip supports parallel 16 bit insns, things may change. +*/ + +static boolean +m32r_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; + /* The Rela structures are used here because that's what + _bfd_elf32_link_read_relocs uses [for convenience - it sets the addend + field to 0]. */ + Elf_Internal_Rela *internal_relocs; + Elf_Internal_Rela *free_relocs = NULL; + 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; + + /* Assume nothing changes. */ + *again = false; + + /* We don't have to do anything for a relocateable link, if + this section does not have relocs, or if this is not a + code section. */ + if (link_info->relocateable + || (sec->flags & SEC_RELOC) == 0 + || sec->reloc_count == 0 + || (sec->flags & SEC_CODE) == 0 + || 0 /* FIXME: check SHF_M32R_CAN_RELAX */) + 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; + + /* Get a copy of the native relocations. */ + 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; + + /* 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_M32R_HI16_SLO) + continue; + + /* Get the section contents if we haven't done so already. */ + if (contents == NULL) + { + /* Get cached copy if it exists. */ + if (elf_section_data (sec)->this_hdr.contents != NULL) + contents = elf_section_data (sec)->this_hdr.contents; + else + { + /* Go get them off disk. */ + 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; + } + } + + /* Read this BFD's symbols if we haven't done so already. */ + if (extsyms == NULL) + { + /* Get cached copy if it exists. */ + if (symtab_hdr->contents != NULL) + extsyms = (Elf32_External_Sym *) symtab_hdr->contents; + else + { + /* Go get them off disk. */ + 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 (irel->r_info) < symtab_hdr->sh_info) + { + Elf_Internal_Sym isym; + asection *sym_sec; + + /* A local symbol. */ + bfd_elf32_swap_symbol_in (abfd, + extsyms + ELF32_R_SYM (irel->r_info), + &isym); + + sym_sec = bfd_section_from_elf_index (abfd, isym.st_shndx); + symval = (isym.st_value + + sym_sec->output_section->vma + + sym_sec->output_offset); + } + 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) + { + /* 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); + } + + /* 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. */ + + /* Try to change a seth/add3/jl subroutine call to bl24 or bl8. + This sequence is generated by the compiler when compiling in + 32 bit mode. Also look for seth/add3 -> ld24. */ + + if (ELF32_R_TYPE (irel->r_info) == (int) R_M32R_HI16_SLO) + { + Elf_Internal_Rela *nrel; + bfd_vma pc = (sec->output_section->vma + sec->output_offset + + irel->r_offset); + bfd_signed_vma pcrel_value = symval - pc; + unsigned int code,reg; + int addend,nop_p,bl8_p,to_delete; + + /* The tests are ordered so that we get out as quickly as possible + if this isn't something we can relax, taking into account that + we are looking for two separate possibilities (jl/ld24). */ + + /* Do nothing if no room in the section for this to be what we're + looking for. */ + if (irel->r_offset > sec->_cooked_size - 8) + continue; + + /* Make sure the next relocation applies to the next + instruction and that it's the add3's reloc. */ + nrel = irel + 1; + if (nrel == irelend + || irel->r_offset + 4 != nrel->r_offset + || ELF32_R_TYPE (nrel->r_info) != (int) R_M32R_LO16) + continue; + + /* See if the instructions are seth/add3. */ + /* FIXME: This is where macros from cgen can come in. */ + code = bfd_get_16 (abfd, contents + irel->r_offset + 0); + if ((code & 0xf0ff) != 0xd0c0) + continue; /* not seth rN,foo */ + reg = (code & 0x0f00) >> 8; + code = bfd_get_16 (abfd, contents + irel->r_offset + 4); + if (code != (0x80a0 | reg | (reg << 8))) + continue; /* not add3 rN,rN,foo */ + + /* At this point we've confirmed we have seth/add3. Now check + whether the next insn is a jl, in which case try to change this + to bl24 or bl8. */ + + /* Ensure the branch target is in range. + The bl24 instruction has a 24 bit operand which is the target + address right shifted by 2, giving a signed range of 26 bits. + Note that 4 bytes are added to the high value because the target + will be at least 4 bytes closer if we can relax. It'll actually + be 4 or 8 bytes closer, but we don't know which just yet and + the difference isn't significant enough to worry about. */ +#ifndef USE_REL /* put in for learning purposes */ + pcrel_value += irel->r_addend; +#else + addend = bfd_get_signed_16 (abfd, contents + irel->r_offset + 2); + pcrel_value += addend; +#endif + + if (pcrel_value >= -(1 << 25) && pcrel_value < (1 << 25) + 4 + /* Do nothing if no room in the section for this to be what we're + looking for. */ + && (irel->r_offset <= sec->_cooked_size - 12) + /* Ensure the next insn is "jl rN". */ + && ((code = bfd_get_16 (abfd, contents + irel->r_offset + 8)), + code != (0x1ec0 | reg))) + { + /* We can relax to bl24/bl8. */ + + /* See if there's a nop following the jl. + Also see if we can use a bl8 insn. */ + code = bfd_get_16 (abfd, contents + irel->r_offset + 10); + nop_p = (code & 0x7fff) == NOP_INSN; + bl8_p = pcrel_value >= -0x200 && pcrel_value < 0x200; + + if (bl8_p) + { + /* Change "seth rN,foo" to "bl8 foo || nop". + We OR in CODE just in case it's not a nop (technically, + CODE currently must be a nop, but for cleanness we + allow it to be anything). */ +#ifndef USE_REL /* put in for learning purposes */ + code = 0x7e000000 | MAKE_PARALLEL (code); +#else + code = (0x7e000000 + (((addend >> 2) & 0xff) << 16)) | MAKE_PARALLEL (code); +#endif + to_delete = 8; + } + else + { + /* Change the seth rN,foo to a bl24 foo. */ +#ifndef USE_REL /* put in for learning purposes */ + code = 0xfe000000; +#else + code = 0xfe000000 + ((addend >> 2) & 0xffffff); +#endif + to_delete = nop_p ? 8 : 4; + } + + bfd_put_32 (abfd, code, contents + irel->r_offset); + + /* Set the new reloc type. */ + irel->r_info = ELF32_R_INFO (ELF32_R_SYM (nrel->r_info), + bl8_p ? R_M32R_10_PCREL : R_M32R_26_PCREL); + + /* Delete the add3 reloc by making it a null reloc. */ + nrel->r_info = ELF32_R_INFO (ELF32_R_SYM (nrel->r_info), + R_M32R_NONE); + } + else if (addend >= 0 + && symval + addend <= 0xffffff) + { + /* We can relax to ld24. */ + + code = 0xe0000000 | (reg << 24) | (addend & 0xffffff); + bfd_put_32 (abfd, code, contents + irel->r_offset); + to_delete = 4; + /* Tell the following code a nop filler isn't needed. */ + nop_p = 1; + } + else + { + /* Can't do anything here. */ + continue; + } + + /* Note that we've changed the relocs, section contents, etc. */ + 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; + + /* Delete TO_DELETE bytes of data. */ + if (!m32r_elf_relax_delete_bytes (abfd, sec, + irel->r_offset + 4, to_delete)) + goto error_return; + + /* Now that the following bytes have been moved into place, see if + we need to replace the jl with a nop. This happens when we had + to use a bl24 insn and the insn following the jl isn't a nop. + Technically, this situation can't happen (since the insn can + never be executed) but to be clean we do this. When the chip + supports parallel 16 bit insns things may change. + We don't need to do this in the case of relaxing to ld24, + and the above code sets nop_p so this isn't done. */ + if (! nop_p && to_delete == 4) + bfd_put_16 (abfd, NOP_INSN, contents + irel->r_offset + 4); + + /* That will change things, so we should relax again. + Note that this is not required, and it may be slow. */ + *again = true; + + continue; + } + + /* loop to try the next reloc */ + } + + 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. */ + +static boolean +m32r_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; + + 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; + + /* Actually delete the bytes. */ + memmove (contents + addr, contents + addr + count, toaddr - addr - count); + sec->_cooked_size -= count; + + /* Adjust all the relocs. */ + 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; + } + + /* 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; + } + } + + return true; +} + +/* This is a version of bfd_generic_get_relocated_section_contents + which uses m32r_elf_relocate_section. */ + +static bfd_byte * +m32r_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 if (isymp->st_shndx == SHN_M32R_SCOMMON) + isec = &m32r_elf_scom_section; + else + { + /* Who knows? */ + isec = NULL; + } + + *secpp = isec; + } + + if (! m32r_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; +} + +#endif /* #if 0 */ + +/* Set the right machine number. */ +static boolean +m32r_elf_object_p (abfd) + bfd *abfd; +{ + switch (elf_elfheader (abfd)->e_flags & EF_M32R_ARCH) + { + default: + case E_M32R_ARCH: (void) bfd_default_set_arch_mach (abfd, bfd_arch_m32r, bfd_mach_m32r); break; + } + return true; +} + +/* Store the machine number in the flags field. */ +static void +m32r_elf_final_write_processing (abfd, linker) + bfd * abfd; + boolean linker; +{ + unsigned long val; + + switch (bfd_get_mach (abfd)) + { + default: + case bfd_mach_m32r: val = E_M32R_ARCH; break; + } + + elf_elfheader (abfd)->e_flags &=~ EF_M32R_ARCH; + elf_elfheader (abfd)->e_flags |= val; +} + +/* Function to keep M32R specific file flags. */ +static boolean +m32r_elf_set_private_flags (abfd, flags) + bfd * abfd; + flagword flags; +{ + BFD_ASSERT (!elf_flags_init (abfd) + || elf_elfheader (abfd)->e_flags == flags); + + elf_elfheader (abfd)->e_flags = flags; + elf_flags_init (abfd) = true; + return true; +} + +/* Copy backend specific data from one object module to another */ +static boolean +m32r_elf_copy_private_bfd_data (ibfd, obfd) + bfd * ibfd; + bfd * obfd; +{ + if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour + || bfd_get_flavour (obfd) != bfd_target_elf_flavour) + return true; + + BFD_ASSERT (!elf_flags_init (obfd) + || (elf_elfheader (obfd)->e_flags + == elf_elfheader (ibfd)->e_flags)); + + elf_gp (obfd) = elf_gp (ibfd); + elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags; + elf_flags_init (obfd) = true; + return true; +} + +/* Merge backend specific data from an object file to the output + object file when linking. */ +static boolean +m32r_elf_merge_private_bfd_data (ibfd, obfd) + bfd * ibfd; + bfd * obfd; +{ + flagword out_flags; + flagword in_flags; + + if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour + || bfd_get_flavour (obfd) != bfd_target_elf_flavour) + return true; + + in_flags = elf_elfheader (ibfd)->e_flags; + out_flags = elf_elfheader (obfd)->e_flags; + + if (! elf_flags_init (obfd)) + { + /* If the input is the default architecture then do not + bother setting the flags for the output architecture, + instead allow future merges to do this. If no future + merges ever set these flags then they will retain their + unitialised values, which surprise surprise, correspond + to the default values. */ + if (bfd_get_arch_info (ibfd)->the_default) + return true; + + elf_flags_init (obfd) = true; + elf_elfheader (obfd)->e_flags = in_flags; + + if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) + && bfd_get_arch_info (obfd)->the_default) + { + return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd)); + } + + return true; + } + + /* Check flag compatibility. */ + if (in_flags == out_flags) + return true; + + if ((in_flags & EF_M32R_ARCH) != (out_flags & EF_M32R_ARCH)) + { + if ((in_flags & EF_M32R_ARCH) != E_M32R_ARCH) + { + _bfd_error_handler (_("%s: Instruction set mismatch with previous modules"), + bfd_get_filename (ibfd)); + + bfd_set_error (bfd_error_bad_value); + return false; + } + } + + return true; +} + +/* Display the flags field */ +static boolean +m32r_elf_print_private_bfd_data (abfd, ptr) + bfd * abfd; + PTR ptr; +{ + FILE * file = (FILE *) ptr; + + BFD_ASSERT (abfd != NULL && ptr != NULL) + + _bfd_elf_print_private_bfd_data (abfd, ptr); + + fprintf (file, _("private flags = %lx"), elf_elfheader (abfd)->e_flags); + + switch (elf_elfheader (abfd)->e_flags & EF_M32R_ARCH) + { + default: + case E_M32R_ARCH: fprintf (file, _(": m32r instructions")); break; + } + + fputc ('\n', file); + + return true; +} + +asection * +m32r_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_M32R_GNU_VTINHERIT: + case R_M32R_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 +m32r_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 m32r */ + 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 +m32r_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_M32R_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_M32R_GNU_VTENTRY: + if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset)) + return false; + break; + } + } + + return true; +} + + + + +#define ELF_ARCH bfd_arch_m32r +#define ELF_MACHINE_CODE EM_CYGNUS_M32R +#define ELF_MAXPAGESIZE 0x1000 + +#define TARGET_BIG_SYM bfd_elf32_m32r_vec +#define TARGET_BIG_NAME "elf32-m32r" + +#define elf_info_to_howto 0 +#define elf_info_to_howto_rel m32r_info_to_howto_rel +#define elf_backend_section_from_bfd_section _bfd_m32r_elf_section_from_bfd_section +#define elf_backend_symbol_processing _bfd_m32r_elf_symbol_processing +#define elf_backend_add_symbol_hook m32r_elf_add_symbol_hook +#define elf_backend_relocate_section m32r_elf_relocate_section +#define elf_backend_gc_mark_hook m32r_elf_gc_mark_hook +#define elf_backend_gc_sweep_hook m32r_elf_gc_sweep_hook +#define elf_backend_check_relocs m32r_elf_check_relocs + +#define elf_backend_can_gc_sections 1 +#if 0 /* not yet */ +/* relax support */ +#define bfd_elf32_bfd_relax_section m32r_elf_relax_section +#define bfd_elf32_bfd_get_relocated_section_contents \ + m32r_elf_get_relocated_section_contents +#endif + +#define elf_backend_object_p m32r_elf_object_p +#define elf_backend_final_write_processing m32r_elf_final_write_processing +#define bfd_elf32_bfd_copy_private_bfd_data m32r_elf_copy_private_bfd_data +#define bfd_elf32_bfd_merge_private_bfd_data m32r_elf_merge_private_bfd_data +#define bfd_elf32_bfd_set_private_flags m32r_elf_set_private_flags +#define bfd_elf32_bfd_print_private_bfd_data m32r_elf_print_private_bfd_data + +#include "elf32-target.h" |