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- /* MMIX-specific support for 64-bit ELF.
- Copyright (C) 2001-2022 Free Software Foundation, Inc.
- Contributed by Hans-Peter Nilsson <hp@bitrange.com>
- This file is part of BFD, the Binary File Descriptor library.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
- MA 02110-1301, USA. */
- /* No specific ABI or "processor-specific supplement" defined. */
- /* TODO:
- - "Traditional" linker relaxation (shrinking whole sections).
- - Merge reloc stubs jumping to same location.
- - GETA stub relaxation (call a stub for out of range new
- R_MMIX_GETA_STUBBABLE). */
- #include "sysdep.h"
- #include "bfd.h"
- #include "libbfd.h"
- #include "elf-bfd.h"
- #include "elf/mmix.h"
- #include "opcode/mmix.h"
- #define MINUS_ONE (((bfd_vma) 0) - 1)
- #define MAX_PUSHJ_STUB_SIZE (5 * 4)
- /* Put these everywhere in new code. */
- #define FATAL_DEBUG \
- _bfd_abort (__FILE__, __LINE__, \
- "Internal: Non-debugged code (test-case missing)")
- #define BAD_CASE(x) \
- _bfd_abort (__FILE__, __LINE__, \
- "bad case for " #x)
- struct _mmix_elf_section_data
- {
- struct bfd_elf_section_data elf;
- union
- {
- struct bpo_reloc_section_info *reloc;
- struct bpo_greg_section_info *greg;
- } bpo;
- struct pushj_stub_info
- {
- /* Maximum number of stubs needed for this section. */
- bfd_size_type n_pushj_relocs;
- /* Size of stubs after a mmix_elf_relax_section round. */
- bfd_size_type stubs_size_sum;
- /* Per-reloc stubs_size_sum information. The stubs_size_sum member is the sum
- of these. Allocated in mmix_elf_check_common_relocs. */
- bfd_size_type *stub_size;
- /* Offset of next stub during relocation. Somewhat redundant with the
- above: error coverage is easier and we don't have to reset the
- stubs_size_sum for relocation. */
- bfd_size_type stub_offset;
- } pjs;
- /* Whether there has been a warning that this section could not be
- linked due to a specific cause. FIXME: a way to access the
- linker info or output section, then stuff the limiter guard
- there. */
- bool has_warned_bpo;
- bool has_warned_pushj;
- };
- #define mmix_elf_section_data(sec) \
- ((struct _mmix_elf_section_data *) elf_section_data (sec))
- /* For each section containing a base-plus-offset (BPO) reloc, we attach
- this struct as mmix_elf_section_data (section)->bpo, which is otherwise
- NULL. */
- struct bpo_reloc_section_info
- {
- /* The base is 1; this is the first number in this section. */
- size_t first_base_plus_offset_reloc;
- /* Number of BPO-relocs in this section. */
- size_t n_bpo_relocs_this_section;
- /* Running index, used at relocation time. */
- size_t bpo_index;
- /* We don't have access to the bfd_link_info struct in
- mmix_final_link_relocate. What we really want to get at is the
- global single struct greg_relocation, so we stash it here. */
- asection *bpo_greg_section;
- };
- /* Helper struct (in global context) for the one below.
- There's one of these created for every BPO reloc. */
- struct bpo_reloc_request
- {
- bfd_vma value;
- /* Valid after relaxation. The base is 0; the first register number
- must be added. The offset is in range 0..255. */
- size_t regindex;
- size_t offset;
- /* The order number for this BPO reloc, corresponding to the order in
- which BPO relocs were found. Used to create an index after reloc
- requests are sorted. */
- size_t bpo_reloc_no;
- /* Set when the value is computed. Better than coding "guard values"
- into the other members. Is FALSE only for BPO relocs in a GC:ed
- section. */
- bool valid;
- };
- /* We attach this as mmix_elf_section_data (sec)->bpo in the linker-allocated
- greg contents section (MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME),
- which is linked into the register contents section
- (MMIX_REG_CONTENTS_SECTION_NAME). This section is created by the
- linker; using the same hook as for usual with BPO relocs does not
- collide. */
- struct bpo_greg_section_info
- {
- /* After GC, this reflects the number of remaining, non-excluded
- BPO-relocs. */
- size_t n_bpo_relocs;
- /* This is the number of allocated bpo_reloc_requests; the size of
- sorted_indexes. Valid after the check.*relocs functions are called
- for all incoming sections. It includes the number of BPO relocs in
- sections that were GC:ed. */
- size_t n_max_bpo_relocs;
- /* A counter used to find out when to fold the BPO gregs, since we
- don't have a single "after-relaxation" hook. */
- size_t n_remaining_bpo_relocs_this_relaxation_round;
- /* The number of linker-allocated GREGs resulting from BPO relocs.
- This is an approximation after _bfd_mmix_before_linker_allocation
- and supposedly accurate after mmix_elf_relax_section is called for
- all incoming non-collected sections. */
- size_t n_allocated_bpo_gregs;
- /* Index into reloc_request[], sorted on increasing "value", secondary
- by increasing index for strict sorting order. */
- size_t *bpo_reloc_indexes;
- /* An array of all relocations, with the "value" member filled in by
- the relaxation function. */
- struct bpo_reloc_request *reloc_request;
- };
- extern bool mmix_elf_final_link (bfd *, struct bfd_link_info *);
- extern void mmix_elf_symbol_processing (bfd *, asymbol *);
- /* Only intended to be called from a debugger. */
- extern void mmix_dump_bpo_gregs
- (struct bfd_link_info *, void (*) (const char *, ...));
- static void
- mmix_set_relaxable_size (bfd *, asection *, void *);
- static bfd_reloc_status_type
- mmix_elf_reloc (bfd *, arelent *, asymbol *, void *,
- asection *, bfd *, char **);
- static bfd_reloc_status_type
- mmix_final_link_relocate (reloc_howto_type *, asection *, bfd_byte *, bfd_vma,
- bfd_signed_vma, bfd_vma, const char *, asection *,
- char **);
- /* Watch out: this currently needs to have elements with the same index as
- their R_MMIX_ number. */
- static reloc_howto_type elf_mmix_howto_table[] =
- {
- /* This reloc does nothing. */
- HOWTO (R_MMIX_NONE, /* type */
- 0, /* rightshift */
- 3, /* size (0 = byte, 1 = short, 2 = long) */
- 0, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_MMIX_NONE", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0, /* dst_mask */
- false), /* pcrel_offset */
- /* An 8 bit absolute relocation. */
- HOWTO (R_MMIX_8, /* type */
- 0, /* rightshift */
- 0, /* size (0 = byte, 1 = short, 2 = long) */
- 8, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_MMIX_8", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xff, /* dst_mask */
- false), /* pcrel_offset */
- /* An 16 bit absolute relocation. */
- HOWTO (R_MMIX_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_MMIX_16", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
- /* An 24 bit absolute relocation. */
- HOWTO (R_MMIX_24, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 24, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_MMIX_24", /* name */
- false, /* partial_inplace */
- ~0xffffff, /* src_mask */
- 0xffffff, /* dst_mask */
- false), /* pcrel_offset */
- /* A 32 bit absolute relocation. */
- HOWTO (R_MMIX_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_MMIX_32", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffffffff, /* dst_mask */
- false), /* pcrel_offset */
- /* 64 bit relocation. */
- HOWTO (R_MMIX_64, /* type */
- 0, /* rightshift */
- 4, /* size (0 = byte, 1 = short, 2 = long) */
- 64, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_MMIX_64", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- MINUS_ONE, /* dst_mask */
- false), /* pcrel_offset */
- /* An 8 bit PC-relative relocation. */
- HOWTO (R_MMIX_PC_8, /* type */
- 0, /* rightshift */
- 0, /* size (0 = byte, 1 = short, 2 = long) */
- 8, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_MMIX_PC_8", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xff, /* dst_mask */
- true), /* pcrel_offset */
- /* An 16 bit PC-relative relocation. */
- HOWTO (R_MMIX_PC_16, /* type */
- 0, /* rightshift */
- 1, /* size (0 = byte, 1 = short, 2 = long) */
- 16, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_MMIX_PC_16", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffff, /* dst_mask */
- true), /* pcrel_offset */
- /* An 24 bit PC-relative relocation. */
- HOWTO (R_MMIX_PC_24, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 24, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_MMIX_PC_24", /* name */
- false, /* partial_inplace */
- ~0xffffff, /* src_mask */
- 0xffffff, /* dst_mask */
- true), /* pcrel_offset */
- /* A 32 bit absolute PC-relative relocation. */
- HOWTO (R_MMIX_PC_32, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 32, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_MMIX_PC_32", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffffffff, /* dst_mask */
- true), /* pcrel_offset */
- /* 64 bit PC-relative relocation. */
- HOWTO (R_MMIX_PC_64, /* type */
- 0, /* rightshift */
- 4, /* size (0 = byte, 1 = short, 2 = long) */
- 64, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- bfd_elf_generic_reloc, /* special_function */
- "R_MMIX_PC_64", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- MINUS_ONE, /* dst_mask */
- true), /* pcrel_offset */
- /* GNU extension to record C++ vtable hierarchy. */
- HOWTO (R_MMIX_GNU_VTINHERIT, /* type */
- 0, /* rightshift */
- 0, /* size (0 = byte, 1 = short, 2 = long) */
- 0, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- NULL, /* special_function */
- "R_MMIX_GNU_VTINHERIT", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0, /* dst_mask */
- true), /* pcrel_offset */
- /* GNU extension to record C++ vtable member usage. */
- HOWTO (R_MMIX_GNU_VTENTRY, /* type */
- 0, /* rightshift */
- 0, /* 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_MMIX_GNU_VTENTRY", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0, /* dst_mask */
- false), /* pcrel_offset */
- /* The GETA relocation is supposed to get any address that could
- possibly be reached by the GETA instruction. It can silently expand
- to get a 64-bit operand, but will complain if any of the two least
- significant bits are set. The howto members reflect a simple GETA. */
- HOWTO (R_MMIX_GETA, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 19, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_GETA", /* name */
- false, /* partial_inplace */
- ~0x0100ffff, /* src_mask */
- 0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
- HOWTO (R_MMIX_GETA_1, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 19, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_GETA_1", /* name */
- false, /* partial_inplace */
- ~0x0100ffff, /* src_mask */
- 0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
- HOWTO (R_MMIX_GETA_2, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 19, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_GETA_2", /* name */
- false, /* partial_inplace */
- ~0x0100ffff, /* src_mask */
- 0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
- HOWTO (R_MMIX_GETA_3, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 19, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_GETA_3", /* name */
- false, /* partial_inplace */
- ~0x0100ffff, /* src_mask */
- 0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
- /* The conditional branches are supposed to reach any (code) address.
- It can silently expand to a 64-bit operand, but will emit an error if
- any of the two least significant bits are set. The howto members
- reflect a simple branch. */
- HOWTO (R_MMIX_CBRANCH, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 19, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_CBRANCH", /* name */
- false, /* partial_inplace */
- ~0x0100ffff, /* src_mask */
- 0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
- HOWTO (R_MMIX_CBRANCH_J, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 19, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_CBRANCH_J", /* name */
- false, /* partial_inplace */
- ~0x0100ffff, /* src_mask */
- 0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
- HOWTO (R_MMIX_CBRANCH_1, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 19, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_CBRANCH_1", /* name */
- false, /* partial_inplace */
- ~0x0100ffff, /* src_mask */
- 0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
- HOWTO (R_MMIX_CBRANCH_2, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 19, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_CBRANCH_2", /* name */
- false, /* partial_inplace */
- ~0x0100ffff, /* src_mask */
- 0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
- HOWTO (R_MMIX_CBRANCH_3, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 19, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_CBRANCH_3", /* name */
- false, /* partial_inplace */
- ~0x0100ffff, /* src_mask */
- 0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
- /* The PUSHJ instruction can reach any (code) address, as long as it's
- the beginning of a function (no usable restriction). It can silently
- expand to a 64-bit operand, but will emit an error if any of the two
- least significant bits are set. It can also expand into a call to a
- stub; see R_MMIX_PUSHJ_STUBBABLE. The howto members reflect a simple
- PUSHJ. */
- HOWTO (R_MMIX_PUSHJ, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 19, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_PUSHJ", /* name */
- false, /* partial_inplace */
- ~0x0100ffff, /* src_mask */
- 0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
- HOWTO (R_MMIX_PUSHJ_1, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 19, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_PUSHJ_1", /* name */
- false, /* partial_inplace */
- ~0x0100ffff, /* src_mask */
- 0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
- HOWTO (R_MMIX_PUSHJ_2, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 19, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_PUSHJ_2", /* name */
- false, /* partial_inplace */
- ~0x0100ffff, /* src_mask */
- 0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
- HOWTO (R_MMIX_PUSHJ_3, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 19, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_PUSHJ_3", /* name */
- false, /* partial_inplace */
- ~0x0100ffff, /* src_mask */
- 0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
- /* A JMP is supposed to reach any (code) address. By itself, it can
- reach +-64M; the expansion can reach all 64 bits. Note that the 64M
- limit is soon reached if you link the program in wildly different
- memory segments. The howto members reflect a trivial JMP. */
- HOWTO (R_MMIX_JMP, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 27, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_JMP", /* name */
- false, /* partial_inplace */
- ~0x1ffffff, /* src_mask */
- 0x1ffffff, /* dst_mask */
- true), /* pcrel_offset */
- HOWTO (R_MMIX_JMP_1, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 27, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_JMP_1", /* name */
- false, /* partial_inplace */
- ~0x1ffffff, /* src_mask */
- 0x1ffffff, /* dst_mask */
- true), /* pcrel_offset */
- HOWTO (R_MMIX_JMP_2, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 27, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_JMP_2", /* name */
- false, /* partial_inplace */
- ~0x1ffffff, /* src_mask */
- 0x1ffffff, /* dst_mask */
- true), /* pcrel_offset */
- HOWTO (R_MMIX_JMP_3, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 27, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_JMP_3", /* name */
- false, /* partial_inplace */
- ~0x1ffffff, /* src_mask */
- 0x1ffffff, /* dst_mask */
- true), /* pcrel_offset */
- /* When we don't emit link-time-relaxable code from the assembler, or
- when relaxation has done all it can do, these relocs are used. For
- GETA/PUSHJ/branches. */
- HOWTO (R_MMIX_ADDR19, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 19, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_ADDR19", /* name */
- false, /* partial_inplace */
- ~0x0100ffff, /* src_mask */
- 0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
- /* For JMP. */
- HOWTO (R_MMIX_ADDR27, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 27, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_ADDR27", /* name */
- false, /* partial_inplace */
- ~0x1ffffff, /* src_mask */
- 0x1ffffff, /* dst_mask */
- true), /* pcrel_offset */
- /* A general register or the value 0..255. If a value, then the
- instruction (offset -3) needs adjusting. */
- HOWTO (R_MMIX_REG_OR_BYTE, /* type */
- 0, /* rightshift */
- 1, /* size (0 = byte, 1 = short, 2 = long) */
- 8, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_REG_OR_BYTE", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xff, /* dst_mask */
- false), /* pcrel_offset */
- /* A general register. */
- HOWTO (R_MMIX_REG, /* type */
- 0, /* rightshift */
- 1, /* size (0 = byte, 1 = short, 2 = long) */
- 8, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_REG", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xff, /* dst_mask */
- false), /* pcrel_offset */
- /* A register plus an index, corresponding to the relocation expression.
- The sizes must correspond to the valid range of the expression, while
- the bitmasks correspond to what we store in the image. */
- HOWTO (R_MMIX_BASE_PLUS_OFFSET, /* type */
- 0, /* rightshift */
- 4, /* size (0 = byte, 1 = short, 2 = long) */
- 64, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_BASE_PLUS_OFFSET", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
- /* A "magic" relocation for a LOCAL expression, asserting that the
- expression is less than the number of global registers. No actual
- modification of the contents is done. Implementing this as a
- relocation was less intrusive than e.g. putting such expressions in a
- section to discard *after* relocation. */
- HOWTO (R_MMIX_LOCAL, /* type */
- 0, /* rightshift */
- 0, /* size (0 = byte, 1 = short, 2 = long) */
- 0, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_LOCAL", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0, /* dst_mask */
- false), /* pcrel_offset */
- HOWTO (R_MMIX_PUSHJ_STUBBABLE, /* type */
- 2, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 19, /* bitsize */
- true, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_signed, /* complain_on_overflow */
- mmix_elf_reloc, /* special_function */
- "R_MMIX_PUSHJ_STUBBABLE", /* name */
- false, /* partial_inplace */
- ~0x0100ffff, /* src_mask */
- 0x0100ffff, /* dst_mask */
- true) /* pcrel_offset */
- };
- /* Map BFD reloc types to MMIX ELF reloc types. */
- struct mmix_reloc_map
- {
- bfd_reloc_code_real_type bfd_reloc_val;
- enum elf_mmix_reloc_type elf_reloc_val;
- };
- static const struct mmix_reloc_map mmix_reloc_map[] =
- {
- {BFD_RELOC_NONE, R_MMIX_NONE},
- {BFD_RELOC_8, R_MMIX_8},
- {BFD_RELOC_16, R_MMIX_16},
- {BFD_RELOC_24, R_MMIX_24},
- {BFD_RELOC_32, R_MMIX_32},
- {BFD_RELOC_64, R_MMIX_64},
- {BFD_RELOC_8_PCREL, R_MMIX_PC_8},
- {BFD_RELOC_16_PCREL, R_MMIX_PC_16},
- {BFD_RELOC_24_PCREL, R_MMIX_PC_24},
- {BFD_RELOC_32_PCREL, R_MMIX_PC_32},
- {BFD_RELOC_64_PCREL, R_MMIX_PC_64},
- {BFD_RELOC_VTABLE_INHERIT, R_MMIX_GNU_VTINHERIT},
- {BFD_RELOC_VTABLE_ENTRY, R_MMIX_GNU_VTENTRY},
- {BFD_RELOC_MMIX_GETA, R_MMIX_GETA},
- {BFD_RELOC_MMIX_CBRANCH, R_MMIX_CBRANCH},
- {BFD_RELOC_MMIX_PUSHJ, R_MMIX_PUSHJ},
- {BFD_RELOC_MMIX_JMP, R_MMIX_JMP},
- {BFD_RELOC_MMIX_ADDR19, R_MMIX_ADDR19},
- {BFD_RELOC_MMIX_ADDR27, R_MMIX_ADDR27},
- {BFD_RELOC_MMIX_REG_OR_BYTE, R_MMIX_REG_OR_BYTE},
- {BFD_RELOC_MMIX_REG, R_MMIX_REG},
- {BFD_RELOC_MMIX_BASE_PLUS_OFFSET, R_MMIX_BASE_PLUS_OFFSET},
- {BFD_RELOC_MMIX_LOCAL, R_MMIX_LOCAL},
- {BFD_RELOC_MMIX_PUSHJ_STUBBABLE, R_MMIX_PUSHJ_STUBBABLE}
- };
- static reloc_howto_type *
- bfd_elf64_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
- bfd_reloc_code_real_type code)
- {
- unsigned int i;
- for (i = 0;
- i < sizeof (mmix_reloc_map) / sizeof (mmix_reloc_map[0]);
- i++)
- {
- if (mmix_reloc_map[i].bfd_reloc_val == code)
- return &elf_mmix_howto_table[mmix_reloc_map[i].elf_reloc_val];
- }
- return NULL;
- }
- static reloc_howto_type *
- bfd_elf64_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
- const char *r_name)
- {
- unsigned int i;
- for (i = 0;
- i < sizeof (elf_mmix_howto_table) / sizeof (elf_mmix_howto_table[0]);
- i++)
- if (elf_mmix_howto_table[i].name != NULL
- && strcasecmp (elf_mmix_howto_table[i].name, r_name) == 0)
- return &elf_mmix_howto_table[i];
- return NULL;
- }
- static bool
- mmix_elf_new_section_hook (bfd *abfd, asection *sec)
- {
- if (!sec->used_by_bfd)
- {
- struct _mmix_elf_section_data *sdata;
- size_t amt = sizeof (*sdata);
- sdata = bfd_zalloc (abfd, amt);
- if (sdata == NULL)
- return false;
- sec->used_by_bfd = sdata;
- }
- return _bfd_elf_new_section_hook (abfd, sec);
- }
- /* This function performs the actual bitfiddling and sanity check for a
- final relocation. Each relocation gets its *worst*-case expansion
- in size when it arrives here; any reduction in size should have been
- caught in linker relaxation earlier. When we get here, the relocation
- looks like the smallest instruction with SWYM:s (nop:s) appended to the
- max size. We fill in those nop:s.
- R_MMIX_GETA: (FIXME: Relaxation should break this up in 1, 2, 3 tetra)
- GETA $N,foo
- ->
- SETL $N,foo & 0xffff
- INCML $N,(foo >> 16) & 0xffff
- INCMH $N,(foo >> 32) & 0xffff
- INCH $N,(foo >> 48) & 0xffff
- R_MMIX_CBRANCH: (FIXME: Relaxation should break this up, but
- condbranches needing relaxation might be rare enough to not be
- worthwhile.)
- [P]Bcc $N,foo
- ->
- [~P]B~cc $N,.+20
- SETL $255,foo & ...
- INCML ...
- INCMH ...
- INCH ...
- GO $255,$255,0
- R_MMIX_PUSHJ: (FIXME: Relaxation...)
- PUSHJ $N,foo
- ->
- SETL $255,foo & ...
- INCML ...
- INCMH ...
- INCH ...
- PUSHGO $N,$255,0
- R_MMIX_JMP: (FIXME: Relaxation...)
- JMP foo
- ->
- SETL $255,foo & ...
- INCML ...
- INCMH ...
- INCH ...
- GO $255,$255,0
- R_MMIX_ADDR19 and R_MMIX_ADDR27 are just filled in. */
- static bfd_reloc_status_type
- mmix_elf_perform_relocation (asection *isec, reloc_howto_type *howto,
- void *datap, bfd_vma addr, bfd_vma value,
- char **error_message)
- {
- bfd *abfd = isec->owner;
- bfd_reloc_status_type flag = bfd_reloc_ok;
- bfd_reloc_status_type r;
- int offs = 0;
- int reg = 255;
- /* The worst case bits are all similar SETL/INCML/INCMH/INCH sequences.
- We handle the differences here and the common sequence later. */
- switch (howto->type)
- {
- case R_MMIX_GETA:
- offs = 0;
- reg = bfd_get_8 (abfd, (bfd_byte *) datap + 1);
- /* We change to an absolute value. */
- value += addr;
- break;
- case R_MMIX_CBRANCH:
- {
- int in1 = bfd_get_16 (abfd, (bfd_byte *) datap) << 16;
- /* Invert the condition and prediction bit, and set the offset
- to five instructions ahead.
- We *can* do better if we want to. If the branch is found to be
- within limits, we could leave the branch as is; there'll just
- be a bunch of NOP:s after it. But we shouldn't see this
- sequence often enough that it's worth doing it. */
- bfd_put_32 (abfd,
- (((in1 ^ ((PRED_INV_BIT | COND_INV_BIT) << 24)) & ~0xffff)
- | (24/4)),
- (bfd_byte *) datap);
- /* Put a "GO $255,$255,0" after the common sequence. */
- bfd_put_32 (abfd,
- ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) | 0xffff00,
- (bfd_byte *) datap + 20);
- /* Common sequence starts at offset 4. */
- offs = 4;
- /* We change to an absolute value. */
- value += addr;
- }
- break;
- case R_MMIX_PUSHJ_STUBBABLE:
- /* If the address fits, we're fine. */
- if ((value & 3) == 0
- /* Note rightshift 0; see R_MMIX_JMP case below. */
- && (r = bfd_check_overflow (complain_overflow_signed,
- howto->bitsize,
- 0,
- bfd_arch_bits_per_address (abfd),
- value)) == bfd_reloc_ok)
- goto pcrel_mmix_reloc_fits;
- else
- {
- bfd_size_type size = isec->rawsize ? isec->rawsize : isec->size;
- /* We have the bytes at the PUSHJ insn and need to get the
- position for the stub. There's supposed to be room allocated
- for the stub. */
- bfd_byte *stubcontents
- = ((bfd_byte *) datap
- - (addr - (isec->output_section->vma + isec->output_offset))
- + size
- + mmix_elf_section_data (isec)->pjs.stub_offset);
- bfd_vma stubaddr;
- if (mmix_elf_section_data (isec)->pjs.n_pushj_relocs == 0)
- {
- /* This shouldn't happen when linking to ELF or mmo, so
- this is an attempt to link to "binary", right? We
- can't access the output bfd, so we can't verify that
- assumption. We only know that the critical
- mmix_elf_check_common_relocs has not been called,
- which happens when the output format is different
- from the input format (and is not mmo). */
- if (! mmix_elf_section_data (isec)->has_warned_pushj)
- {
- /* For the first such error per input section, produce
- a verbose message. */
- *error_message
- = _("invalid input relocation when producing"
- " non-ELF, non-mmo format output;"
- " please use the objcopy program to convert from"
- " ELF or mmo,"
- " or assemble using"
- " \"-no-expand\" (for gcc, \"-Wa,-no-expand\"");
- mmix_elf_section_data (isec)->has_warned_pushj = true;
- return bfd_reloc_dangerous;
- }
- /* For subsequent errors, return this one, which is
- rate-limited but looks a little bit different,
- hopefully without affecting user-friendliness. */
- return bfd_reloc_overflow;
- }
- /* The address doesn't fit, so redirect the PUSHJ to the
- location of the stub. */
- r = mmix_elf_perform_relocation (isec,
- &elf_mmix_howto_table
- [R_MMIX_ADDR19],
- datap,
- addr,
- isec->output_section->vma
- + isec->output_offset
- + size
- + (mmix_elf_section_data (isec)
- ->pjs.stub_offset)
- - addr,
- error_message);
- if (r != bfd_reloc_ok)
- return r;
- stubaddr
- = (isec->output_section->vma
- + isec->output_offset
- + size
- + mmix_elf_section_data (isec)->pjs.stub_offset);
- /* We generate a simple JMP if that suffices, else the whole 5
- insn stub. */
- if (bfd_check_overflow (complain_overflow_signed,
- elf_mmix_howto_table[R_MMIX_ADDR27].bitsize,
- 0,
- bfd_arch_bits_per_address (abfd),
- addr + value - stubaddr) == bfd_reloc_ok)
- {
- bfd_put_32 (abfd, JMP_INSN_BYTE << 24, stubcontents);
- r = mmix_elf_perform_relocation (isec,
- &elf_mmix_howto_table
- [R_MMIX_ADDR27],
- stubcontents,
- stubaddr,
- value + addr - stubaddr,
- error_message);
- mmix_elf_section_data (isec)->pjs.stub_offset += 4;
- if (size + mmix_elf_section_data (isec)->pjs.stub_offset
- > isec->size)
- abort ();
- return r;
- }
- else
- {
- /* Put a "GO $255,0" after the common sequence. */
- bfd_put_32 (abfd,
- ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24)
- | 0xff00, (bfd_byte *) stubcontents + 16);
- /* Prepare for the general code to set the first part of the
- linker stub, and */
- value += addr;
- datap = stubcontents;
- mmix_elf_section_data (isec)->pjs.stub_offset
- += MAX_PUSHJ_STUB_SIZE;
- }
- }
- break;
- case R_MMIX_PUSHJ:
- {
- int inreg = bfd_get_8 (abfd, (bfd_byte *) datap + 1);
- /* Put a "PUSHGO $N,$255,0" after the common sequence. */
- bfd_put_32 (abfd,
- ((PUSHGO_INSN_BYTE | IMM_OFFSET_BIT) << 24)
- | (inreg << 16)
- | 0xff00,
- (bfd_byte *) datap + 16);
- /* We change to an absolute value. */
- value += addr;
- }
- break;
- case R_MMIX_JMP:
- /* This one is a little special. If we get here on a non-relaxing
- link, and the destination is actually in range, we don't need to
- execute the nops.
- If so, we fall through to the bit-fiddling relocs.
- FIXME: bfd_check_overflow seems broken; the relocation is
- rightshifted before testing, so supply a zero rightshift. */
- if (! ((value & 3) == 0
- && (r = bfd_check_overflow (complain_overflow_signed,
- howto->bitsize,
- 0,
- bfd_arch_bits_per_address (abfd),
- value)) == bfd_reloc_ok))
- {
- /* If the relocation doesn't fit in a JMP, we let the NOP:s be
- modified below, and put a "GO $255,$255,0" after the
- address-loading sequence. */
- bfd_put_32 (abfd,
- ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24)
- | 0xffff00,
- (bfd_byte *) datap + 16);
- /* We change to an absolute value. */
- value += addr;
- break;
- }
- /* FALLTHROUGH. */
- case R_MMIX_ADDR19:
- case R_MMIX_ADDR27:
- pcrel_mmix_reloc_fits:
- /* These must be in range, or else we emit an error. */
- if ((value & 3) == 0
- /* Note rightshift 0; see above. */
- && (r = bfd_check_overflow (complain_overflow_signed,
- howto->bitsize,
- 0,
- bfd_arch_bits_per_address (abfd),
- value)) == bfd_reloc_ok)
- {
- bfd_vma in1
- = bfd_get_32 (abfd, (bfd_byte *) datap);
- bfd_vma highbit;
- if ((bfd_signed_vma) value < 0)
- {
- highbit = 1 << 24;
- value += (1 << (howto->bitsize - 1));
- }
- else
- highbit = 0;
- value >>= 2;
- bfd_put_32 (abfd,
- (in1 & howto->src_mask)
- | highbit
- | (value & howto->dst_mask),
- (bfd_byte *) datap);
- return bfd_reloc_ok;
- }
- else
- return bfd_reloc_overflow;
- case R_MMIX_BASE_PLUS_OFFSET:
- {
- struct bpo_reloc_section_info *bpodata
- = mmix_elf_section_data (isec)->bpo.reloc;
- asection *bpo_greg_section;
- struct bpo_greg_section_info *gregdata;
- size_t bpo_index;
- if (bpodata == NULL)
- {
- /* This shouldn't happen when linking to ELF or mmo, so
- this is an attempt to link to "binary", right? We
- can't access the output bfd, so we can't verify that
- assumption. We only know that the critical
- mmix_elf_check_common_relocs has not been called, which
- happens when the output format is different from the
- input format (and is not mmo). */
- if (! mmix_elf_section_data (isec)->has_warned_bpo)
- {
- /* For the first such error per input section, produce
- a verbose message. */
- *error_message
- = _("invalid input relocation when producing"
- " non-ELF, non-mmo format output;"
- " please use the objcopy program to convert from"
- " ELF or mmo,"
- " or compile using the gcc-option"
- " \"-mno-base-addresses\".");
- mmix_elf_section_data (isec)->has_warned_bpo = true;
- return bfd_reloc_dangerous;
- }
- /* For subsequent errors, return this one, which is
- rate-limited but looks a little bit different,
- hopefully without affecting user-friendliness. */
- return bfd_reloc_overflow;
- }
- bpo_greg_section = bpodata->bpo_greg_section;
- gregdata = mmix_elf_section_data (bpo_greg_section)->bpo.greg;
- bpo_index = gregdata->bpo_reloc_indexes[bpodata->bpo_index++];
- /* A consistency check: The value we now have in "relocation" must
- be the same as the value we stored for that relocation. It
- doesn't cost much, so can be left in at all times. */
- if (value != gregdata->reloc_request[bpo_index].value)
- {
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: Internal inconsistency error for value for\n\
- linker-allocated global register: linked: %#" PRIx64 " != relaxed: %#" PRIx64 ""),
- isec->owner,
- (uint64_t) value,
- (uint64_t) gregdata->reloc_request[bpo_index].value);
- bfd_set_error (bfd_error_bad_value);
- return bfd_reloc_overflow;
- }
- /* Then store the register number and offset for that register
- into datap and datap + 1 respectively. */
- bfd_put_8 (abfd,
- gregdata->reloc_request[bpo_index].regindex
- + bpo_greg_section->output_section->vma / 8,
- datap);
- bfd_put_8 (abfd,
- gregdata->reloc_request[bpo_index].offset,
- ((unsigned char *) datap) + 1);
- return bfd_reloc_ok;
- }
- case R_MMIX_REG_OR_BYTE:
- case R_MMIX_REG:
- if (value > 255)
- return bfd_reloc_overflow;
- bfd_put_8 (abfd, value, datap);
- return bfd_reloc_ok;
- default:
- BAD_CASE (howto->type);
- }
- /* This code adds the common SETL/INCML/INCMH/INCH worst-case
- sequence. */
- /* Lowest two bits must be 0. We return bfd_reloc_overflow for
- everything that looks strange. */
- if (value & 3)
- flag = bfd_reloc_overflow;
- bfd_put_32 (abfd,
- (SETL_INSN_BYTE << 24) | (value & 0xffff) | (reg << 16),
- (bfd_byte *) datap + offs);
- bfd_put_32 (abfd,
- (INCML_INSN_BYTE << 24) | ((value >> 16) & 0xffff) | (reg << 16),
- (bfd_byte *) datap + offs + 4);
- bfd_put_32 (abfd,
- (INCMH_INSN_BYTE << 24) | ((value >> 32) & 0xffff) | (reg << 16),
- (bfd_byte *) datap + offs + 8);
- bfd_put_32 (abfd,
- (INCH_INSN_BYTE << 24) | ((value >> 48) & 0xffff) | (reg << 16),
- (bfd_byte *) datap + offs + 12);
- return flag;
- }
- /* Set the howto pointer for an MMIX ELF reloc (type RELA). */
- static bool
- mmix_info_to_howto_rela (bfd *abfd,
- arelent *cache_ptr,
- Elf_Internal_Rela *dst)
- {
- unsigned int r_type;
- r_type = ELF64_R_TYPE (dst->r_info);
- if (r_type >= (unsigned int) R_MMIX_max)
- {
- /* xgettext:c-format */
- _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
- abfd, r_type);
- bfd_set_error (bfd_error_bad_value);
- return false;
- }
- cache_ptr->howto = &elf_mmix_howto_table[r_type];
- return true;
- }
- /* Any MMIX-specific relocation gets here at assembly time or when linking
- to other formats (such as mmo); this is the relocation function from
- the reloc_table. We don't get here for final pure ELF linking. */
- static bfd_reloc_status_type
- mmix_elf_reloc (bfd *abfd,
- arelent *reloc_entry,
- asymbol *symbol,
- void * data,
- asection *input_section,
- bfd *output_bfd,
- char **error_message)
- {
- bfd_vma relocation;
- bfd_reloc_status_type r;
- asection *reloc_target_output_section;
- bfd_reloc_status_type flag = bfd_reloc_ok;
- bfd_vma output_base = 0;
- r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
- input_section, output_bfd, error_message);
- /* If that was all that was needed (i.e. this isn't a final link, only
- some segment adjustments), we're done. */
- if (r != bfd_reloc_continue)
- return r;
- if (bfd_is_und_section (symbol->section)
- && (symbol->flags & BSF_WEAK) == 0
- && output_bfd == (bfd *) NULL)
- return bfd_reloc_undefined;
- /* Is the address of the relocation really within the section? */
- if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
- return bfd_reloc_outofrange;
- /* Work out which section the relocation is targeted at and the
- initial relocation command value. */
- /* Get symbol value. (Common symbols are special.) */
- if (bfd_is_com_section (symbol->section))
- relocation = 0;
- else
- relocation = symbol->value;
- reloc_target_output_section = bfd_asymbol_section (symbol)->output_section;
- /* Here the variable relocation holds the final address of the symbol we
- are relocating against, plus any addend. */
- if (output_bfd)
- output_base = 0;
- else
- output_base = reloc_target_output_section->vma;
- relocation += output_base + symbol->section->output_offset;
- if (output_bfd != (bfd *) NULL)
- {
- /* Add in supplied addend. */
- relocation += reloc_entry->addend;
- /* This is a partial relocation, and we want to apply the
- relocation to the reloc entry rather than the raw data.
- Modify the reloc inplace to reflect what we now know. */
- reloc_entry->addend = relocation;
- reloc_entry->address += input_section->output_offset;
- return flag;
- }
- return mmix_final_link_relocate (reloc_entry->howto, input_section,
- data, reloc_entry->address,
- reloc_entry->addend, relocation,
- bfd_asymbol_name (symbol),
- reloc_target_output_section,
- error_message);
- }
- /* Relocate an MMIX ELF section. Modified from elf32-fr30.c; look to it
- for guidance if you're thinking of copying this. */
- static int
- mmix_elf_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED,
- struct bfd_link_info *info,
- bfd *input_bfd,
- asection *input_section,
- bfd_byte *contents,
- Elf_Internal_Rela *relocs,
- Elf_Internal_Sym *local_syms,
- asection **local_sections)
- {
- Elf_Internal_Shdr *symtab_hdr;
- struct elf_link_hash_entry **sym_hashes;
- Elf_Internal_Rela *rel;
- Elf_Internal_Rela *relend;
- bfd_size_type size;
- size_t pjsno = 0;
- size = input_section->rawsize ? input_section->rawsize : input_section->size;
- symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
- sym_hashes = elf_sym_hashes (input_bfd);
- relend = relocs + input_section->reloc_count;
- /* Zero the stub area before we start. */
- if (input_section->rawsize != 0
- && input_section->size > input_section->rawsize)
- memset (contents + input_section->rawsize, 0,
- input_section->size - input_section->rawsize);
- for (rel = relocs; rel < relend; rel ++)
- {
- reloc_howto_type *howto;
- unsigned long r_symndx;
- Elf_Internal_Sym *sym;
- asection *sec;
- struct elf_link_hash_entry *h;
- bfd_vma relocation;
- bfd_reloc_status_type r;
- const char *name = NULL;
- int r_type;
- bool undefined_signalled = false;
- r_type = ELF64_R_TYPE (rel->r_info);
- if (r_type == R_MMIX_GNU_VTINHERIT
- || r_type == R_MMIX_GNU_VTENTRY)
- continue;
- r_symndx = ELF64_R_SYM (rel->r_info);
- howto = elf_mmix_howto_table + ELF64_R_TYPE (rel->r_info);
- h = NULL;
- sym = NULL;
- sec = NULL;
- if (r_symndx < symtab_hdr->sh_info)
- {
- sym = local_syms + r_symndx;
- sec = local_sections [r_symndx];
- relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
- name = bfd_elf_string_from_elf_section (input_bfd,
- symtab_hdr->sh_link,
- sym->st_name);
- if (name == NULL)
- name = bfd_section_name (sec);
- }
- else
- {
- bool unresolved_reloc, ignored;
- RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
- r_symndx, symtab_hdr, sym_hashes,
- h, sec, relocation,
- unresolved_reloc, undefined_signalled,
- ignored);
- name = h->root.root.string;
- }
- if (sec != NULL && discarded_section (sec))
- RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
- rel, 1, relend, howto, 0, contents);
- if (bfd_link_relocatable (info))
- {
- /* This is a relocatable link. For most relocs 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 (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
- rel->r_addend += sec->output_offset;
- /* For PUSHJ stub relocs however, we may need to change the
- reloc and the section contents, if the reloc doesn't reach
- beyond the end of the output section and previous stubs.
- Then we change the section contents to be a PUSHJ to the end
- of the input section plus stubs (we can do that without using
- a reloc), and then we change the reloc to be a R_MMIX_PUSHJ
- at the stub location. */
- if (r_type == R_MMIX_PUSHJ_STUBBABLE)
- {
- /* We've already checked whether we need a stub; use that
- knowledge. */
- if (mmix_elf_section_data (input_section)->pjs.stub_size[pjsno]
- != 0)
- {
- Elf_Internal_Rela relcpy;
- if (mmix_elf_section_data (input_section)
- ->pjs.stub_size[pjsno] != MAX_PUSHJ_STUB_SIZE)
- abort ();
- /* There's already a PUSHJ insn there, so just fill in
- the offset bits to the stub. */
- if (mmix_final_link_relocate (elf_mmix_howto_table
- + R_MMIX_ADDR19,
- input_section,
- contents,
- rel->r_offset,
- 0,
- input_section
- ->output_section->vma
- + input_section->output_offset
- + size
- + mmix_elf_section_data (input_section)
- ->pjs.stub_offset,
- NULL, NULL, NULL) != bfd_reloc_ok)
- return false;
- /* Put a JMP insn at the stub; it goes with the
- R_MMIX_JMP reloc. */
- bfd_put_32 (output_bfd, JMP_INSN_BYTE << 24,
- contents
- + size
- + mmix_elf_section_data (input_section)
- ->pjs.stub_offset);
- /* Change the reloc to be at the stub, and to a full
- R_MMIX_JMP reloc. */
- rel->r_info = ELF64_R_INFO (r_symndx, R_MMIX_JMP);
- rel->r_offset
- = (size
- + mmix_elf_section_data (input_section)
- ->pjs.stub_offset);
- mmix_elf_section_data (input_section)->pjs.stub_offset
- += MAX_PUSHJ_STUB_SIZE;
- /* Shift this reloc to the end of the relocs to maintain
- the r_offset sorted reloc order. */
- relcpy = *rel;
- memmove (rel, rel + 1, (char *) relend - (char *) rel);
- relend[-1] = relcpy;
- /* Back up one reloc, or else we'd skip the next reloc
- in turn. */
- rel--;
- }
- pjsno++;
- }
- continue;
- }
- r = mmix_final_link_relocate (howto, input_section,
- contents, rel->r_offset,
- rel->r_addend, relocation, name, sec, NULL);
- if (r != bfd_reloc_ok)
- {
- const char * msg = (const char *) NULL;
- switch (r)
- {
- case bfd_reloc_overflow:
- info->callbacks->reloc_overflow
- (info, (h ? &h->root : NULL), name, howto->name,
- (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
- break;
- case bfd_reloc_undefined:
- /* We may have sent this message above. */
- if (! undefined_signalled)
- info->callbacks->undefined_symbol
- (info, name, input_bfd, input_section, rel->r_offset, true);
- undefined_signalled = true;
- break;
- case bfd_reloc_outofrange:
- msg = _("internal error: out of range error");
- break;
- case bfd_reloc_notsupported:
- msg = _("internal error: unsupported relocation error");
- break;
- case bfd_reloc_dangerous:
- msg = _("internal error: dangerous relocation");
- break;
- default:
- msg = _("internal error: unknown error");
- break;
- }
- if (msg)
- (*info->callbacks->warning) (info, msg, name, input_bfd,
- input_section, rel->r_offset);
- }
- }
- return true;
- }
- /* Perform a single relocation. By default we use the standard BFD
- routines. A few relocs we have to do ourselves. */
- static bfd_reloc_status_type
- mmix_final_link_relocate (reloc_howto_type *howto, asection *input_section,
- bfd_byte *contents, bfd_vma r_offset,
- bfd_signed_vma r_addend, bfd_vma relocation,
- const char *symname, asection *symsec,
- char **error_message)
- {
- bfd_reloc_status_type r = bfd_reloc_ok;
- bfd_vma addr
- = (input_section->output_section->vma
- + input_section->output_offset
- + r_offset);
- bfd_signed_vma srel
- = (bfd_signed_vma) relocation + r_addend;
- switch (howto->type)
- {
- /* All these are PC-relative. */
- case R_MMIX_PUSHJ_STUBBABLE:
- case R_MMIX_PUSHJ:
- case R_MMIX_CBRANCH:
- case R_MMIX_ADDR19:
- case R_MMIX_GETA:
- case R_MMIX_ADDR27:
- case R_MMIX_JMP:
- contents += r_offset;
- srel -= (input_section->output_section->vma
- + input_section->output_offset
- + r_offset);
- r = mmix_elf_perform_relocation (input_section, howto, contents,
- addr, srel, error_message);
- break;
- case R_MMIX_BASE_PLUS_OFFSET:
- if (symsec == NULL)
- return bfd_reloc_undefined;
- /* Check that we're not relocating against a register symbol. */
- if (strcmp (bfd_section_name (symsec),
- MMIX_REG_CONTENTS_SECTION_NAME) == 0
- || strcmp (bfd_section_name (symsec),
- MMIX_REG_SECTION_NAME) == 0)
- {
- /* Note: This is separated out into two messages in order
- to ease the translation into other languages. */
- if (symname == NULL || *symname == 0)
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: base-plus-offset relocation against register symbol:"
- " (unknown) in %pA"),
- input_section->owner, symsec);
- else
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: base-plus-offset relocation against register symbol:"
- " %s in %pA"),
- input_section->owner, symname, symsec);
- return bfd_reloc_overflow;
- }
- goto do_mmix_reloc;
- case R_MMIX_REG_OR_BYTE:
- case R_MMIX_REG:
- /* For now, we handle these alike. They must refer to an register
- symbol, which is either relative to the register section and in
- the range 0..255, or is in the register contents section with vma
- regno * 8. */
- /* FIXME: A better way to check for reg contents section?
- FIXME: Postpone section->scaling to mmix_elf_perform_relocation? */
- if (symsec == NULL)
- return bfd_reloc_undefined;
- if (strcmp (bfd_section_name (symsec),
- MMIX_REG_CONTENTS_SECTION_NAME) == 0)
- {
- if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8)
- {
- /* The bfd_reloc_outofrange return value, though intuitively
- a better value, will not get us an error. */
- return bfd_reloc_overflow;
- }
- srel /= 8;
- }
- else if (strcmp (bfd_section_name (symsec),
- MMIX_REG_SECTION_NAME) == 0)
- {
- if (srel < 0 || srel > 255)
- /* The bfd_reloc_outofrange return value, though intuitively a
- better value, will not get us an error. */
- return bfd_reloc_overflow;
- }
- else
- {
- /* Note: This is separated out into two messages in order
- to ease the translation into other languages. */
- if (symname == NULL || *symname == 0)
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: register relocation against non-register symbol:"
- " (unknown) in %pA"),
- input_section->owner, symsec);
- else
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: register relocation against non-register symbol:"
- " %s in %pA"),
- input_section->owner, symname, symsec);
- /* The bfd_reloc_outofrange return value, though intuitively a
- better value, will not get us an error. */
- return bfd_reloc_overflow;
- }
- do_mmix_reloc:
- contents += r_offset;
- r = mmix_elf_perform_relocation (input_section, howto, contents,
- addr, srel, error_message);
- break;
- case R_MMIX_LOCAL:
- /* This isn't a real relocation, it's just an assertion that the
- final relocation value corresponds to a local register. We
- ignore the actual relocation; nothing is changed. */
- {
- asection *regsec
- = bfd_get_section_by_name (input_section->output_section->owner,
- MMIX_REG_CONTENTS_SECTION_NAME);
- bfd_vma first_global;
- /* Check that this is an absolute value, or a reference to the
- register contents section or the register (symbol) section.
- Absolute numbers can get here as undefined section. Undefined
- symbols are signalled elsewhere, so there's no conflict in us
- accidentally handling it. */
- if (!bfd_is_abs_section (symsec)
- && !bfd_is_und_section (symsec)
- && strcmp (bfd_section_name (symsec),
- MMIX_REG_CONTENTS_SECTION_NAME) != 0
- && strcmp (bfd_section_name (symsec),
- MMIX_REG_SECTION_NAME) != 0)
- {
- _bfd_error_handler
- (_("%pB: directive LOCAL valid only with a register or absolute value"),
- input_section->owner);
- return bfd_reloc_overflow;
- }
- /* If we don't have a register contents section, then $255 is the
- first global register. */
- if (regsec == NULL)
- first_global = 255;
- else
- {
- first_global = bfd_section_vma (regsec) / 8;
- if (strcmp (bfd_section_name (symsec),
- MMIX_REG_CONTENTS_SECTION_NAME) == 0)
- {
- if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8)
- /* The bfd_reloc_outofrange return value, though
- intuitively a better value, will not get us an error. */
- return bfd_reloc_overflow;
- srel /= 8;
- }
- }
- if ((bfd_vma) srel >= first_global)
- {
- /* FIXME: Better error message. */
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: LOCAL directive: "
- "register $%" PRId64 " is not a local register;"
- " first global register is $%" PRId64),
- input_section->owner, (int64_t) srel, (int64_t) first_global);
- return bfd_reloc_overflow;
- }
- }
- r = bfd_reloc_ok;
- break;
- default:
- r = _bfd_final_link_relocate (howto, input_section->owner, input_section,
- contents, r_offset,
- relocation, r_addend);
- }
- return r;
- }
- /* Return the section that should be marked against GC for a given
- relocation. */
- static asection *
- mmix_elf_gc_mark_hook (asection *sec,
- struct bfd_link_info *info,
- Elf_Internal_Rela *rel,
- struct elf_link_hash_entry *h,
- Elf_Internal_Sym *sym)
- {
- if (h != NULL)
- switch (ELF64_R_TYPE (rel->r_info))
- {
- case R_MMIX_GNU_VTINHERIT:
- case R_MMIX_GNU_VTENTRY:
- return NULL;
- }
- return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
- }
- /* Sort register relocs to come before expanding relocs. */
- static int
- mmix_elf_sort_relocs (const void * p1, const void * p2)
- {
- const Elf_Internal_Rela *r1 = (const Elf_Internal_Rela *) p1;
- const Elf_Internal_Rela *r2 = (const Elf_Internal_Rela *) p2;
- int r1_is_reg, r2_is_reg;
- /* Sort primarily on r_offset & ~3, so relocs are done to consecutive
- insns. */
- if ((r1->r_offset & ~(bfd_vma) 3) > (r2->r_offset & ~(bfd_vma) 3))
- return 1;
- else if ((r1->r_offset & ~(bfd_vma) 3) < (r2->r_offset & ~(bfd_vma) 3))
- return -1;
- r1_is_reg
- = (ELF64_R_TYPE (r1->r_info) == R_MMIX_REG_OR_BYTE
- || ELF64_R_TYPE (r1->r_info) == R_MMIX_REG);
- r2_is_reg
- = (ELF64_R_TYPE (r2->r_info) == R_MMIX_REG_OR_BYTE
- || ELF64_R_TYPE (r2->r_info) == R_MMIX_REG);
- if (r1_is_reg != r2_is_reg)
- return r2_is_reg - r1_is_reg;
- /* Neither or both are register relocs. Then sort on full offset. */
- if (r1->r_offset > r2->r_offset)
- return 1;
- else if (r1->r_offset < r2->r_offset)
- return -1;
- return 0;
- }
- /* Subset of mmix_elf_check_relocs, common to ELF and mmo linking. */
- static bool
- mmix_elf_check_common_relocs (bfd *abfd,
- struct bfd_link_info *info,
- asection *sec,
- const Elf_Internal_Rela *relocs)
- {
- bfd *bpo_greg_owner = NULL;
- asection *allocated_gregs_section = NULL;
- struct bpo_greg_section_info *gregdata = NULL;
- struct bpo_reloc_section_info *bpodata = NULL;
- const Elf_Internal_Rela *rel;
- const Elf_Internal_Rela *rel_end;
- /* We currently have to abuse this COFF-specific member, since there's
- no target-machine-dedicated member. There's no alternative outside
- the bfd_link_info struct; we can't specialize a hash-table since
- they're different between ELF and mmo. */
- bpo_greg_owner = (bfd *) info->base_file;
- rel_end = relocs + sec->reloc_count;
- for (rel = relocs; rel < rel_end; rel++)
- {
- switch (ELF64_R_TYPE (rel->r_info))
- {
- /* This relocation causes a GREG allocation. We need to count
- them, and we need to create a section for them, so we need an
- object to fake as the owner of that section. We can't use
- the ELF dynobj for this, since the ELF bits assume lots of
- DSO-related stuff if that member is non-NULL. */
- case R_MMIX_BASE_PLUS_OFFSET:
- /* We don't do anything with this reloc for a relocatable link. */
- if (bfd_link_relocatable (info))
- break;
- if (bpo_greg_owner == NULL)
- {
- bpo_greg_owner = abfd;
- info->base_file = bpo_greg_owner;
- }
- if (allocated_gregs_section == NULL)
- allocated_gregs_section
- = bfd_get_section_by_name (bpo_greg_owner,
- MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
- if (allocated_gregs_section == NULL)
- {
- allocated_gregs_section
- = bfd_make_section_with_flags (bpo_greg_owner,
- MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME,
- (SEC_HAS_CONTENTS
- | SEC_IN_MEMORY
- | SEC_LINKER_CREATED));
- /* Setting both SEC_ALLOC and SEC_LOAD means the section is
- treated like any other section, and we'd get errors for
- address overlap with the text section. Let's set none of
- those flags, as that is what currently happens for usual
- GREG allocations, and that works. */
- if (allocated_gregs_section == NULL
- || !bfd_set_section_alignment (allocated_gregs_section, 3))
- return false;
- gregdata = (struct bpo_greg_section_info *)
- bfd_zalloc (bpo_greg_owner, sizeof (struct bpo_greg_section_info));
- if (gregdata == NULL)
- return false;
- mmix_elf_section_data (allocated_gregs_section)->bpo.greg
- = gregdata;
- }
- else if (gregdata == NULL)
- gregdata
- = mmix_elf_section_data (allocated_gregs_section)->bpo.greg;
- /* Get ourselves some auxiliary info for the BPO-relocs. */
- if (bpodata == NULL)
- {
- /* No use doing a separate iteration pass to find the upper
- limit - just use the number of relocs. */
- bpodata = (struct bpo_reloc_section_info *)
- bfd_alloc (bpo_greg_owner,
- sizeof (struct bpo_reloc_section_info)
- * (sec->reloc_count + 1));
- if (bpodata == NULL)
- return false;
- mmix_elf_section_data (sec)->bpo.reloc = bpodata;
- bpodata->first_base_plus_offset_reloc
- = bpodata->bpo_index
- = gregdata->n_max_bpo_relocs;
- bpodata->bpo_greg_section
- = allocated_gregs_section;
- bpodata->n_bpo_relocs_this_section = 0;
- }
- bpodata->n_bpo_relocs_this_section++;
- gregdata->n_max_bpo_relocs++;
- /* We don't get another chance to set this before GC; we've not
- set up any hook that runs before GC. */
- gregdata->n_bpo_relocs
- = gregdata->n_max_bpo_relocs;
- break;
- case R_MMIX_PUSHJ_STUBBABLE:
- mmix_elf_section_data (sec)->pjs.n_pushj_relocs++;
- break;
- }
- }
- /* Allocate per-reloc stub storage and initialize it to the max stub
- size. */
- if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs != 0)
- {
- size_t i;
- mmix_elf_section_data (sec)->pjs.stub_size
- = bfd_alloc (abfd, mmix_elf_section_data (sec)->pjs.n_pushj_relocs
- * sizeof (mmix_elf_section_data (sec)
- ->pjs.stub_size[0]));
- if (mmix_elf_section_data (sec)->pjs.stub_size == NULL)
- return false;
- for (i = 0; i < mmix_elf_section_data (sec)->pjs.n_pushj_relocs; i++)
- mmix_elf_section_data (sec)->pjs.stub_size[i] = MAX_PUSHJ_STUB_SIZE;
- }
- return true;
- }
- /* Look through the relocs for a section during the first phase. */
- static bool
- mmix_elf_check_relocs (bfd *abfd,
- struct bfd_link_info *info,
- asection *sec,
- const Elf_Internal_Rela *relocs)
- {
- Elf_Internal_Shdr *symtab_hdr;
- struct elf_link_hash_entry **sym_hashes;
- const Elf_Internal_Rela *rel;
- const Elf_Internal_Rela *rel_end;
- symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
- sym_hashes = elf_sym_hashes (abfd);
- /* First we sort the relocs so that any register relocs come before
- expansion-relocs to the same insn. FIXME: Not done for mmo. */
- qsort ((void *) relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
- mmix_elf_sort_relocs);
- /* Do the common part. */
- if (!mmix_elf_check_common_relocs (abfd, info, sec, relocs))
- return false;
- if (bfd_link_relocatable (info))
- return true;
- 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 = ELF64_R_SYM (rel->r_info);
- if (r_symndx < symtab_hdr->sh_info)
- h = NULL;
- else
- {
- h = sym_hashes[r_symndx - symtab_hdr->sh_info];
- while (h->root.type == bfd_link_hash_indirect
- || h->root.type == bfd_link_hash_warning)
- h = (struct elf_link_hash_entry *) h->root.u.i.link;
- }
- switch (ELF64_R_TYPE (rel->r_info))
- {
- /* This relocation describes the C++ object vtable hierarchy.
- Reconstruct it for later use during GC. */
- case R_MMIX_GNU_VTINHERIT:
- if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
- return false;
- break;
- /* This relocation describes which C++ vtable entries are actually
- used. Record for later use during GC. */
- case R_MMIX_GNU_VTENTRY:
- if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
- return false;
- break;
- }
- }
- return true;
- }
- /* Wrapper for mmix_elf_check_common_relocs, called when linking to mmo.
- Copied from elf_link_add_object_symbols. */
- bool
- _bfd_mmix_check_all_relocs (bfd *abfd, struct bfd_link_info *info)
- {
- asection *o;
- for (o = abfd->sections; o != NULL; o = o->next)
- {
- Elf_Internal_Rela *internal_relocs;
- bool ok;
- if ((o->flags & SEC_RELOC) == 0
- || o->reloc_count == 0
- || ((info->strip == strip_all || info->strip == strip_debugger)
- && (o->flags & SEC_DEBUGGING) != 0)
- || bfd_is_abs_section (o->output_section))
- continue;
- internal_relocs
- = _bfd_elf_link_read_relocs (abfd, o, NULL,
- (Elf_Internal_Rela *) NULL,
- info->keep_memory);
- if (internal_relocs == NULL)
- return false;
- ok = mmix_elf_check_common_relocs (abfd, info, o, internal_relocs);
- if (! info->keep_memory)
- free (internal_relocs);
- if (! ok)
- return false;
- }
- return true;
- }
- /* Change symbols relative to the reg contents section to instead be to
- the register section, and scale them down to correspond to the register
- number. */
- static int
- mmix_elf_link_output_symbol_hook (struct bfd_link_info *info ATTRIBUTE_UNUSED,
- const char *name ATTRIBUTE_UNUSED,
- Elf_Internal_Sym *sym,
- asection *input_sec,
- struct elf_link_hash_entry *h ATTRIBUTE_UNUSED)
- {
- if (input_sec != NULL
- && input_sec->name != NULL
- && ELF_ST_TYPE (sym->st_info) != STT_SECTION
- && strcmp (input_sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0)
- {
- sym->st_value /= 8;
- sym->st_shndx = SHN_REGISTER;
- }
- return 1;
- }
- /* We fake a register section that holds values that are register numbers.
- Having a SHN_REGISTER and register section translates better to other
- formats (e.g. mmo) than for example a STT_REGISTER attribute.
- This section faking is based on a construct in elf32-mips.c. */
- static asection mmix_elf_reg_section;
- static const asymbol mmix_elf_reg_section_symbol =
- GLOBAL_SYM_INIT (MMIX_REG_SECTION_NAME, &mmix_elf_reg_section);
- static asection mmix_elf_reg_section =
- BFD_FAKE_SECTION (mmix_elf_reg_section, &mmix_elf_reg_section_symbol,
- MMIX_REG_SECTION_NAME, 0, SEC_NO_FLAGS);
- /* Handle the special section numbers that a symbol may use. */
- void
- mmix_elf_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, asymbol *asym)
- {
- elf_symbol_type *elfsym;
- elfsym = (elf_symbol_type *) asym;
- switch (elfsym->internal_elf_sym.st_shndx)
- {
- case SHN_REGISTER:
- asym->section = &mmix_elf_reg_section;
- break;
- default:
- break;
- }
- }
- /* Given a BFD section, try to locate the corresponding ELF section
- index. */
- static bool
- mmix_elf_section_from_bfd_section (bfd * abfd ATTRIBUTE_UNUSED,
- asection * sec,
- int * retval)
- {
- if (strcmp (bfd_section_name (sec), MMIX_REG_SECTION_NAME) == 0)
- *retval = SHN_REGISTER;
- else
- return false;
- return true;
- }
- /* Hook called by the linker routine which adds symbols from an object
- file. We must handle the special SHN_REGISTER section number here.
- We also check that we only have *one* each of the section-start
- symbols, since otherwise having two with the same value would cause
- them to be "merged", but with the contents serialized. */
- static bool
- mmix_elf_add_symbol_hook (bfd *abfd,
- struct bfd_link_info *info ATTRIBUTE_UNUSED,
- Elf_Internal_Sym *sym,
- const char **namep ATTRIBUTE_UNUSED,
- flagword *flagsp ATTRIBUTE_UNUSED,
- asection **secp,
- bfd_vma *valp ATTRIBUTE_UNUSED)
- {
- if (sym->st_shndx == SHN_REGISTER)
- {
- *secp = bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME);
- (*secp)->flags |= SEC_LINKER_CREATED;
- }
- else if ((*namep)[0] == '_' && (*namep)[1] == '_' && (*namep)[2] == '.'
- && startswith (*namep, MMIX_LOC_SECTION_START_SYMBOL_PREFIX))
- {
- /* See if we have another one. */
- struct bfd_link_hash_entry *h = bfd_link_hash_lookup (info->hash,
- *namep,
- false,
- false,
- false);
- if (h != NULL && h->type != bfd_link_hash_undefined)
- {
- /* How do we get the asymbol (or really: the filename) from h?
- h->u.def.section->owner is NULL. */
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%pB: error: multiple definition of `%s'; start of %s "
- "is set in a earlier linked file"),
- abfd, *namep,
- *namep + strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX));
- bfd_set_error (bfd_error_bad_value);
- return false;
- }
- }
- return true;
- }
- /* We consider symbols matching "L.*:[0-9]+" to be local symbols. */
- static bool
- mmix_elf_is_local_label_name (bfd *abfd, const char *name)
- {
- const char *colpos;
- int digits;
- /* Also include the default local-label definition. */
- if (_bfd_elf_is_local_label_name (abfd, name))
- return true;
- if (*name != 'L')
- return false;
- /* If there's no ":", or more than one, it's not a local symbol. */
- colpos = strchr (name, ':');
- if (colpos == NULL || strchr (colpos + 1, ':') != NULL)
- return false;
- /* Check that there are remaining characters and that they are digits. */
- if (colpos[1] == 0)
- return false;
- digits = strspn (colpos + 1, "0123456789");
- return digits != 0 && colpos[1 + digits] == 0;
- }
- /* We get rid of the register section here. */
- bool
- mmix_elf_final_link (bfd *abfd, struct bfd_link_info *info)
- {
- /* We never output a register section, though we create one for
- temporary measures. Check that nobody entered contents into it. */
- asection *reg_section;
- reg_section = bfd_get_section_by_name (abfd, MMIX_REG_SECTION_NAME);
- if (reg_section != NULL)
- {
- /* FIXME: Pass error state gracefully. */
- if (bfd_section_flags (reg_section) & SEC_HAS_CONTENTS)
- _bfd_abort (__FILE__, __LINE__, _("register section has contents\n"));
- /* Really remove the section, if it hasn't already been done. */
- if (!bfd_section_removed_from_list (abfd, reg_section))
- {
- bfd_section_list_remove (abfd, reg_section);
- --abfd->section_count;
- }
- }
- if (! bfd_elf_final_link (abfd, info))
- return false;
- /* Since this section is marked SEC_LINKER_CREATED, it isn't output by
- the regular linker machinery. We do it here, like other targets with
- special sections. */
- if (info->base_file != NULL)
- {
- asection *greg_section
- = bfd_get_section_by_name ((bfd *) info->base_file,
- MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
- if (!bfd_set_section_contents (abfd,
- greg_section->output_section,
- greg_section->contents,
- (file_ptr) greg_section->output_offset,
- greg_section->size))
- return false;
- }
- return true;
- }
- /* We need to include the maximum size of PUSHJ-stubs in the initial
- section size. This is expected to shrink during linker relaxation. */
- static void
- mmix_set_relaxable_size (bfd *abfd ATTRIBUTE_UNUSED,
- asection *sec,
- void *ptr)
- {
- struct bfd_link_info *info = ptr;
- /* Make sure we only do this for section where we know we want this,
- otherwise we might end up resetting the size of COMMONs. */
- if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0)
- return;
- sec->rawsize = sec->size;
- sec->size += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs
- * MAX_PUSHJ_STUB_SIZE);
- /* For use in relocatable link, we start with a max stubs size. See
- mmix_elf_relax_section. */
- if (bfd_link_relocatable (info) && sec->output_section)
- mmix_elf_section_data (sec->output_section)->pjs.stubs_size_sum
- += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs
- * MAX_PUSHJ_STUB_SIZE);
- }
- /* Initialize stuff for the linker-generated GREGs to match
- R_MMIX_BASE_PLUS_OFFSET relocs seen by the linker. */
- bool
- _bfd_mmix_before_linker_allocation (bfd *abfd ATTRIBUTE_UNUSED,
- struct bfd_link_info *info)
- {
- asection *bpo_gregs_section;
- bfd *bpo_greg_owner;
- struct bpo_greg_section_info *gregdata;
- size_t n_gregs;
- bfd_vma gregs_size;
- size_t i;
- size_t *bpo_reloc_indexes;
- bfd *ibfd;
- /* Set the initial size of sections. */
- for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
- bfd_map_over_sections (ibfd, mmix_set_relaxable_size, info);
- /* The bpo_greg_owner bfd is supposed to have been set by
- mmix_elf_check_relocs when the first R_MMIX_BASE_PLUS_OFFSET is seen.
- If there is no such object, there was no R_MMIX_BASE_PLUS_OFFSET. */
- bpo_greg_owner = (bfd *) info->base_file;
- if (bpo_greg_owner == NULL)
- return true;
- bpo_gregs_section
- = bfd_get_section_by_name (bpo_greg_owner,
- MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
- if (bpo_gregs_section == NULL)
- return true;
- /* We use the target-data handle in the ELF section data. */
- gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
- if (gregdata == NULL)
- return false;
- n_gregs = gregdata->n_bpo_relocs;
- gregdata->n_allocated_bpo_gregs = n_gregs;
- /* When this reaches zero during relaxation, all entries have been
- filled in and the size of the linker gregs can be calculated. */
- gregdata->n_remaining_bpo_relocs_this_relaxation_round = n_gregs;
- /* Set the zeroth-order estimate for the GREGs size. */
- gregs_size = n_gregs * 8;
- if (!bfd_set_section_size (bpo_gregs_section, gregs_size))
- return false;
- /* Allocate and set up the GREG arrays. They're filled in at relaxation
- time. Note that we must use the max number ever noted for the array,
- since the index numbers were created before GC. */
- gregdata->reloc_request
- = bfd_zalloc (bpo_greg_owner,
- sizeof (struct bpo_reloc_request)
- * gregdata->n_max_bpo_relocs);
- gregdata->bpo_reloc_indexes
- = bpo_reloc_indexes
- = bfd_alloc (bpo_greg_owner,
- gregdata->n_max_bpo_relocs
- * sizeof (size_t));
- if (bpo_reloc_indexes == NULL)
- return false;
- /* The default order is an identity mapping. */
- for (i = 0; i < gregdata->n_max_bpo_relocs; i++)
- {
- bpo_reloc_indexes[i] = i;
- gregdata->reloc_request[i].bpo_reloc_no = i;
- }
- return true;
- }
- /* Fill in contents in the linker allocated gregs. Everything is
- calculated at this point; we just move the contents into place here. */
- bool
- _bfd_mmix_after_linker_allocation (bfd *abfd ATTRIBUTE_UNUSED,
- struct bfd_link_info *link_info)
- {
- asection *bpo_gregs_section;
- bfd *bpo_greg_owner;
- struct bpo_greg_section_info *gregdata;
- size_t n_gregs;
- size_t i, j;
- size_t lastreg;
- bfd_byte *contents;
- /* The bpo_greg_owner bfd is supposed to have been set by mmix_elf_check_relocs
- when the first R_MMIX_BASE_PLUS_OFFSET is seen. If there is no such
- object, there was no R_MMIX_BASE_PLUS_OFFSET. */
- bpo_greg_owner = (bfd *) link_info->base_file;
- if (bpo_greg_owner == NULL)
- return true;
- bpo_gregs_section
- = bfd_get_section_by_name (bpo_greg_owner,
- MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
- /* This can't happen without DSO handling. When DSOs are handled
- without any R_MMIX_BASE_PLUS_OFFSET seen, there will be no such
- section. */
- if (bpo_gregs_section == NULL)
- return true;
- /* We use the target-data handle in the ELF section data. */
- gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
- if (gregdata == NULL)
- return false;
- n_gregs = gregdata->n_allocated_bpo_gregs;
- bpo_gregs_section->contents
- = contents = bfd_alloc (bpo_greg_owner, bpo_gregs_section->size);
- if (contents == NULL)
- return false;
- /* Sanity check: If these numbers mismatch, some relocation has not been
- accounted for and the rest of gregdata is probably inconsistent.
- It's a bug, but it's more helpful to identify it than segfaulting
- below. */
- if (gregdata->n_remaining_bpo_relocs_this_relaxation_round
- != gregdata->n_bpo_relocs)
- {
- _bfd_error_handler
- /* xgettext:c-format */
- (_("internal inconsistency: remaining %lu != max %lu;"
- " please report this bug"),
- (unsigned long) gregdata->n_remaining_bpo_relocs_this_relaxation_round,
- (unsigned long) gregdata->n_bpo_relocs);
- return false;
- }
- for (lastreg = 255, i = 0, j = 0; j < n_gregs; i++)
- if (gregdata->reloc_request[i].regindex != lastreg)
- {
- bfd_put_64 (bpo_greg_owner, gregdata->reloc_request[i].value,
- contents + j * 8);
- lastreg = gregdata->reloc_request[i].regindex;
- j++;
- }
- return true;
- }
- /* Sort valid relocs to come before non-valid relocs, then on increasing
- value. */
- static int
- bpo_reloc_request_sort_fn (const void * p1, const void * p2)
- {
- const struct bpo_reloc_request *r1 = (const struct bpo_reloc_request *) p1;
- const struct bpo_reloc_request *r2 = (const struct bpo_reloc_request *) p2;
- /* Primary function is validity; non-valid relocs sorted after valid
- ones. */
- if (r1->valid != r2->valid)
- return r2->valid - r1->valid;
- /* Then sort on value. Don't simplify and return just the difference of
- the values: the upper bits of the 64-bit value would be truncated on
- a host with 32-bit ints. */
- if (r1->value != r2->value)
- return r1->value > r2->value ? 1 : -1;
- /* As a last re-sort, use the relocation number, so we get a stable
- sort. The *addresses* aren't stable since items are swapped during
- sorting. It depends on the qsort implementation if this actually
- happens. */
- return r1->bpo_reloc_no > r2->bpo_reloc_no
- ? 1 : (r1->bpo_reloc_no < r2->bpo_reloc_no ? -1 : 0);
- }
- /* For debug use only. Dumps the global register allocations resulting
- from base-plus-offset relocs. */
- void
- mmix_dump_bpo_gregs (struct bfd_link_info *link_info,
- void (*pf) (const char *fmt, ...))
- {
- bfd *bpo_greg_owner;
- asection *bpo_gregs_section;
- struct bpo_greg_section_info *gregdata;
- unsigned int i;
- if (link_info == NULL || link_info->base_file == NULL)
- return;
- bpo_greg_owner = (bfd *) link_info->base_file;
- bpo_gregs_section
- = bfd_get_section_by_name (bpo_greg_owner,
- MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
- if (bpo_gregs_section == NULL)
- return;
- gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
- if (gregdata == NULL)
- return;
- if (pf == NULL)
- pf = _bfd_error_handler;
- /* These format strings are not translated. They are for debug purposes
- only and never displayed to an end user. Should they escape, we
- surely want them in original. */
- (*pf) (" n_bpo_relocs: %u\n n_max_bpo_relocs: %u\n n_remain...round: %u\n\
- n_allocated_bpo_gregs: %u\n", gregdata->n_bpo_relocs,
- gregdata->n_max_bpo_relocs,
- gregdata->n_remaining_bpo_relocs_this_relaxation_round,
- gregdata->n_allocated_bpo_gregs);
- if (gregdata->reloc_request)
- for (i = 0; i < gregdata->n_max_bpo_relocs; i++)
- (*pf) ("%4u (%4u)/%4u#%u: 0x%08lx%08lx r: %3u o: %3u\n",
- i,
- (gregdata->bpo_reloc_indexes != NULL
- ? gregdata->bpo_reloc_indexes[i] : (size_t) -1),
- gregdata->reloc_request[i].bpo_reloc_no,
- gregdata->reloc_request[i].valid,
- (unsigned long) (gregdata->reloc_request[i].value >> 32),
- (unsigned long) gregdata->reloc_request[i].value,
- gregdata->reloc_request[i].regindex,
- gregdata->reloc_request[i].offset);
- }
- /* This links all R_MMIX_BASE_PLUS_OFFSET relocs into a special array, and
- when the last such reloc is done, an index-array is sorted according to
- the values and iterated over to produce register numbers (indexed by 0
- from the first allocated register number) and offsets for use in real
- relocation. (N.B.: Relocatable runs are handled, not just punted.)
- PUSHJ stub accounting is also done here.
- Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */
- static bool
- mmix_elf_relax_section (bfd *abfd,
- asection *sec,
- struct bfd_link_info *link_info,
- bool *again)
- {
- Elf_Internal_Shdr *symtab_hdr;
- Elf_Internal_Rela *internal_relocs;
- Elf_Internal_Rela *irel, *irelend;
- asection *bpo_gregs_section = NULL;
- struct bpo_greg_section_info *gregdata;
- struct bpo_reloc_section_info *bpodata
- = mmix_elf_section_data (sec)->bpo.reloc;
- /* The initialization is to quiet compiler warnings. The value is to
- spot a missing actual initialization. */
- size_t bpono = (size_t) -1;
- size_t pjsno = 0;
- size_t pjsno_undefs = 0;
- Elf_Internal_Sym *isymbuf = NULL;
- bfd_size_type size = sec->rawsize ? sec->rawsize : sec->size;
- mmix_elf_section_data (sec)->pjs.stubs_size_sum = 0;
- /* Assume nothing changes. */
- *again = false;
- /* We don't have to do anything if this section does not have relocs, or
- if this is not a code section. */
- if ((sec->flags & SEC_RELOC) == 0
- || sec->reloc_count == 0
- || (sec->flags & SEC_CODE) == 0
- || (sec->flags & SEC_LINKER_CREATED) != 0
- /* If no R_MMIX_BASE_PLUS_OFFSET relocs and no PUSHJ-stub relocs,
- then nothing to do. */
- || (bpodata == NULL
- && mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0))
- return true;
- symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
- if (bpodata != NULL)
- {
- bpo_gregs_section = bpodata->bpo_greg_section;
- gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg;
- bpono = bpodata->first_base_plus_offset_reloc;
- }
- else
- gregdata = NULL;
- /* Get a copy of the native relocations. */
- internal_relocs
- = _bfd_elf_link_read_relocs (abfd, sec, NULL,
- (Elf_Internal_Rela *) NULL,
- link_info->keep_memory);
- if (internal_relocs == NULL)
- goto error_return;
- /* Walk through them looking for relaxing opportunities. */
- irelend = internal_relocs + sec->reloc_count;
- for (irel = internal_relocs; irel < irelend; irel++)
- {
- bfd_vma symval;
- struct elf_link_hash_entry *h = NULL;
- /* We only process two relocs. */
- if (ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_BASE_PLUS_OFFSET
- && ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_PUSHJ_STUBBABLE)
- continue;
- /* We process relocs in a distinctly different way when this is a
- relocatable link (for one, we don't look at symbols), so we avoid
- mixing its code with that for the "normal" relaxation. */
- if (bfd_link_relocatable (link_info))
- {
- /* The only transformation in a relocatable link is to generate
- a full stub at the location of the stub calculated for the
- input section, if the relocated stub location, the end of the
- output section plus earlier stubs, cannot be reached. Thus
- relocatable linking can only lead to worse code, but it still
- works. */
- if (ELF64_R_TYPE (irel->r_info) == R_MMIX_PUSHJ_STUBBABLE)
- {
- /* If we can reach the end of the output-section and beyond
- any current stubs, then we don't need a stub for this
- reloc. The relaxed order of output stub allocation may
- not exactly match the straightforward order, so we always
- assume presence of output stubs, which will allow
- relaxation only on relocations indifferent to the
- presence of output stub allocations for other relocations
- and thus the order of output stub allocation. */
- if (bfd_check_overflow (complain_overflow_signed,
- 19,
- 0,
- bfd_arch_bits_per_address (abfd),
- /* Output-stub location. */
- sec->output_section->rawsize
- + (mmix_elf_section_data (sec
- ->output_section)
- ->pjs.stubs_size_sum)
- /* Location of this PUSHJ reloc. */
- - (sec->output_offset + irel->r_offset)
- /* Don't count *this* stub twice. */
- - (mmix_elf_section_data (sec)
- ->pjs.stub_size[pjsno]
- + MAX_PUSHJ_STUB_SIZE))
- == bfd_reloc_ok)
- mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0;
- mmix_elf_section_data (sec)->pjs.stubs_size_sum
- += mmix_elf_section_data (sec)->pjs.stub_size[pjsno];
- pjsno++;
- }
- continue;
- }
- /* Get the value of the symbol referred to by the reloc. */
- if (ELF64_R_SYM (irel->r_info) < symtab_hdr->sh_info)
- {
- /* A local symbol. */
- Elf_Internal_Sym *isym;
- asection *sym_sec;
- /* Read this BFD's local symbols if we haven't already. */
- if (isymbuf == NULL)
- {
- isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
- if (isymbuf == NULL)
- isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
- symtab_hdr->sh_info, 0,
- NULL, NULL, NULL);
- if (isymbuf == 0)
- goto error_return;
- }
- isym = isymbuf + ELF64_R_SYM (irel->r_info);
- if (isym->st_shndx == SHN_UNDEF)
- sym_sec = bfd_und_section_ptr;
- else if (isym->st_shndx == SHN_ABS)
- sym_sec = bfd_abs_section_ptr;
- else if (isym->st_shndx == SHN_COMMON)
- sym_sec = bfd_com_section_ptr;
- else
- 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;
- /* An external symbol. */
- indx = ELF64_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_undefweak)
- /* FIXME: for R_MMIX_PUSHJ_STUBBABLE, there are alternatives to
- the canonical value 0 for an unresolved weak symbol to
- consider: as the debug-friendly approach, resolve to "abort"
- (or a port-specific function), or as the space-friendly
- approach resolve to the next instruction (like some other
- ports, notably ARM and AArch64). These alternatives require
- matching code in mmix_elf_perform_relocation or its caller. */
- symval = 0;
- else if (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- symval = (h->root.u.def.value
- + h->root.u.def.section->output_section->vma
- + h->root.u.def.section->output_offset);
- else
- {
- /* This appears to be a reference to an undefined symbol. Just
- ignore it--it will be caught by the regular reloc processing.
- We need to keep BPO reloc accounting consistent, though
- else we'll abort instead of emitting an error message. */
- if (ELF64_R_TYPE (irel->r_info) == R_MMIX_BASE_PLUS_OFFSET
- && gregdata != NULL)
- {
- gregdata->n_remaining_bpo_relocs_this_relaxation_round--;
- bpono++;
- }
- /* Similarly, keep accounting consistent for PUSHJ
- referring to an undefined symbol. */
- if (ELF64_R_TYPE (irel->r_info) == R_MMIX_PUSHJ_STUBBABLE)
- pjsno_undefs++;
- continue;
- }
- }
- if (ELF64_R_TYPE (irel->r_info) == (int) R_MMIX_PUSHJ_STUBBABLE)
- {
- bfd_vma value = symval + irel->r_addend;
- bfd_vma dot
- = (sec->output_section->vma
- + sec->output_offset
- + irel->r_offset);
- bfd_vma stubaddr
- = (sec->output_section->vma
- + sec->output_offset
- + size
- + mmix_elf_section_data (sec)->pjs.stubs_size_sum);
- if ((value & 3) == 0
- && bfd_check_overflow (complain_overflow_signed,
- 19,
- 0,
- bfd_arch_bits_per_address (abfd),
- value - dot
- - (value > dot
- ? mmix_elf_section_data (sec)
- ->pjs.stub_size[pjsno]
- : 0))
- == bfd_reloc_ok)
- /* If the reloc fits, no stub is needed. */
- mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0;
- else
- /* Maybe we can get away with just a JMP insn? */
- if ((value & 3) == 0
- && bfd_check_overflow (complain_overflow_signed,
- 27,
- 0,
- bfd_arch_bits_per_address (abfd),
- value - stubaddr
- - (value > dot
- ? mmix_elf_section_data (sec)
- ->pjs.stub_size[pjsno] - 4
- : 0))
- == bfd_reloc_ok)
- /* Yep, account for a stub consisting of a single JMP insn. */
- mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 4;
- else
- /* Nope, go for the full insn stub. It doesn't seem useful to
- emit the intermediate sizes; those will only be useful for
- a >64M program assuming contiguous code. */
- mmix_elf_section_data (sec)->pjs.stub_size[pjsno]
- = MAX_PUSHJ_STUB_SIZE;
- mmix_elf_section_data (sec)->pjs.stubs_size_sum
- += mmix_elf_section_data (sec)->pjs.stub_size[pjsno];
- pjsno++;
- continue;
- }
- /* We're looking at a R_MMIX_BASE_PLUS_OFFSET reloc. */
- gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono]].value
- = symval + irel->r_addend;
- gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono++]].valid = true;
- gregdata->n_remaining_bpo_relocs_this_relaxation_round--;
- }
- /* Check if that was the last BPO-reloc. If so, sort the values and
- calculate how many registers we need to cover them. Set the size of
- the linker gregs, and if the number of registers changed, indicate
- that we need to relax some more because we have more work to do. */
- if (gregdata != NULL
- && gregdata->n_remaining_bpo_relocs_this_relaxation_round == 0)
- {
- size_t i;
- bfd_vma prev_base;
- size_t regindex;
- /* First, reset the remaining relocs for the next round. */
- gregdata->n_remaining_bpo_relocs_this_relaxation_round
- = gregdata->n_bpo_relocs;
- qsort (gregdata->reloc_request,
- gregdata->n_max_bpo_relocs,
- sizeof (struct bpo_reloc_request),
- bpo_reloc_request_sort_fn);
- /* Recalculate indexes. When we find a change (however unlikely
- after the initial iteration), we know we need to relax again,
- since items in the GREG-array are sorted by increasing value and
- stored in the relaxation phase. */
- for (i = 0; i < gregdata->n_max_bpo_relocs; i++)
- if (gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no]
- != i)
- {
- gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no]
- = i;
- *again = true;
- }
- /* Allocate register numbers (indexing from 0). Stop at the first
- non-valid reloc. */
- for (i = 0, regindex = 0, prev_base = gregdata->reloc_request[0].value;
- i < gregdata->n_bpo_relocs;
- i++)
- {
- if (gregdata->reloc_request[i].value > prev_base + 255)
- {
- regindex++;
- prev_base = gregdata->reloc_request[i].value;
- }
- gregdata->reloc_request[i].regindex = regindex;
- gregdata->reloc_request[i].offset
- = gregdata->reloc_request[i].value - prev_base;
- }
- /* If it's not the same as the last time, we need to relax again,
- because the size of the section has changed. I'm not sure we
- actually need to do any adjustments since the shrinking happens
- at the start of this section, but better safe than sorry. */
- if (gregdata->n_allocated_bpo_gregs != regindex + 1)
- {
- gregdata->n_allocated_bpo_gregs = regindex + 1;
- *again = true;
- }
- bpo_gregs_section->size = (regindex + 1) * 8;
- }
- if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents)
- {
- if (! link_info->keep_memory)
- free (isymbuf);
- else
- {
- /* Cache the symbols for elf_link_input_bfd. */
- symtab_hdr->contents = (unsigned char *) isymbuf;
- }
- }
- BFD_ASSERT(pjsno + pjsno_undefs
- == mmix_elf_section_data (sec)->pjs.n_pushj_relocs);
- if (elf_section_data (sec)->relocs != internal_relocs)
- free (internal_relocs);
- if (sec->size < size + mmix_elf_section_data (sec)->pjs.stubs_size_sum)
- abort ();
- if (sec->size > size + mmix_elf_section_data (sec)->pjs.stubs_size_sum)
- {
- sec->size = size + mmix_elf_section_data (sec)->pjs.stubs_size_sum;
- *again = true;
- }
- return true;
- error_return:
- if ((unsigned char *) isymbuf != symtab_hdr->contents)
- free (isymbuf);
- if (elf_section_data (sec)->relocs != internal_relocs)
- free (internal_relocs);
- return false;
- }
- #define ELF_ARCH bfd_arch_mmix
- #define ELF_MACHINE_CODE EM_MMIX
- /* According to mmix-doc page 36 (paragraph 45), this should be (1LL << 48LL).
- However, that's too much for something somewhere in the linker part of
- BFD; perhaps the start-address has to be a non-zero multiple of this
- number, or larger than this number. The symptom is that the linker
- complains: "warning: allocated section `.text' not in segment". We
- settle for 64k; the page-size used in examples is 8k.
- #define ELF_MAXPAGESIZE 0x10000
- Unfortunately, this causes excessive padding in the supposedly small
- for-education programs that are the expected usage (where people would
- inspect output). We stick to 256 bytes just to have *some* default
- alignment. */
- #define ELF_MAXPAGESIZE 0x100
- #define TARGET_BIG_SYM mmix_elf64_vec
- #define TARGET_BIG_NAME "elf64-mmix"
- #define elf_info_to_howto_rel NULL
- #define elf_info_to_howto mmix_info_to_howto_rela
- #define elf_backend_relocate_section mmix_elf_relocate_section
- #define elf_backend_gc_mark_hook mmix_elf_gc_mark_hook
- #define elf_backend_link_output_symbol_hook \
- mmix_elf_link_output_symbol_hook
- #define elf_backend_add_symbol_hook mmix_elf_add_symbol_hook
- #define elf_backend_check_relocs mmix_elf_check_relocs
- #define elf_backend_symbol_processing mmix_elf_symbol_processing
- #define elf_backend_omit_section_dynsym _bfd_elf_omit_section_dynsym_all
- #define bfd_elf64_bfd_copy_link_hash_symbol_type \
- _bfd_generic_copy_link_hash_symbol_type
- #define bfd_elf64_bfd_is_local_label_name \
- mmix_elf_is_local_label_name
- #define elf_backend_may_use_rel_p 0
- #define elf_backend_may_use_rela_p 1
- #define elf_backend_default_use_rela_p 1
- #define elf_backend_can_gc_sections 1
- #define elf_backend_section_from_bfd_section \
- mmix_elf_section_from_bfd_section
- #define bfd_elf64_new_section_hook mmix_elf_new_section_hook
- #define bfd_elf64_bfd_final_link mmix_elf_final_link
- #define bfd_elf64_bfd_relax_section mmix_elf_relax_section
- #include "elf64-target.h"
|