/* MMIX-specific support for 64-bit ELF.
- Copyright 2001, 2002 Free Software Foundation, Inc.
+ Copyright (C) 2001-2019 Free Software Foundation, Inc.
Contributed by Hans-Peter Nilsson <hp@bitrange.com>
-This file is part of BFD, the Binary File Descriptor library.
+ 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 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.
+ 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. */
-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. */
/* No specific ABI or "processor-specific supplement" defined. */
/* TODO:
- - Linker relaxation.
- - On-demand register allocation (from R_MMIX_BASE_PLUS_OFFSET). */
+ - "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 "bfd.h"
#include "sysdep.h"
+#include "bfd.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/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__, \
_bfd_abort (__FILE__, __LINE__, \
"bad case for " #x)
-static boolean mmix_elf_link_output_symbol_hook
- PARAMS ((bfd *, struct bfd_link_info *, const char *,
- Elf_Internal_Sym *, asection *));
-
-static bfd_reloc_status_type mmix_elf_reloc
- PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
-
-static reloc_howto_type *bfd_elf64_bfd_reloc_type_lookup
- PARAMS ((bfd *, bfd_reloc_code_real_type));
+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;
-static void mmix_info_to_howto_rela
- PARAMS ((bfd *, arelent *, Elf64_Internal_Rela *));
+ 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. */
+ bfd_boolean has_warned_bpo;
+ bfd_boolean 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;
-static int mmix_elf_sort_relocs PARAMS ((const PTR, const PTR));
+ /* Number of BPO-relocs in this section. */
+ size_t n_bpo_relocs_this_section;
-static boolean mmix_elf_check_relocs
- PARAMS ((bfd *, struct bfd_link_info *, asection *,
- const Elf_Internal_Rela *));
+ /* Running index, used at relocation time. */
+ size_t bpo_index;
-static boolean mmix_elf_relocate_section
- PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
- Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
+ /* 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;
+ };
-static asection * mmix_elf_gc_mark_hook
- PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
- struct elf_link_hash_entry *, Elf_Internal_Sym *));
+/* 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. */
+ bfd_boolean valid;
+ };
-static bfd_reloc_status_type mmix_final_link_relocate
- PARAMS ((reloc_howto_type *, asection *, bfd_byte *,
- bfd_vma, bfd_signed_vma, bfd_vma, const char *, asection *));
+/* 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;
+ };
-static bfd_reloc_status_type mmix_elf_perform_relocation
- PARAMS ((asection *, reloc_howto_type *, PTR, bfd_vma, bfd_vma));
-static boolean mmix_elf_section_from_bfd_section
- PARAMS ((bfd *, asection *, int *));
+extern bfd_boolean mmix_elf_final_link (bfd *, struct bfd_link_info *);
-static boolean mmix_elf_add_symbol_hook
- PARAMS ((bfd *, struct bfd_link_info *, const Elf_Internal_Sym *,
- const char **, flagword *, asection **, bfd_vma *));
+extern void mmix_elf_symbol_processing (bfd *, asymbol *);
-static boolean mmix_elf_is_local_label_name
- PARAMS ((bfd *, const char *));
+/* Only intended to be called from a debugger. */
+extern void mmix_dump_bpo_gregs
+ (struct bfd_link_info *, void (*) (const char *, ...));
-extern boolean mmix_elf_final_link PARAMS ((bfd *, struct bfd_link_info *));
+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 **);
-extern void mmix_elf_symbol_processing PARAMS ((bfd *, asymbol *));
/* Watch out: this currently needs to have elements with the same index as
their R_MMIX_ number. */
/* This reloc does nothing. */
HOWTO (R_MMIX_NONE, /* type */
0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 32, /* bitsize */
- false, /* pc_relative */
+ 3, /* size (0 = byte, 1 = short, 2 = long) */
+ 0, /* bitsize */
+ FALSE, /* pc_relative */
0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
+ complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_MMIX_NONE", /* name */
- false, /* partial_inplace */
+ FALSE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
- false), /* pcrel_offset */
+ 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 */
+ FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_MMIX_8", /* name */
- false, /* partial_inplace */
- 0xff, /* src_mask */
+ FALSE, /* partial_inplace */
+ 0, /* src_mask */
0xff, /* dst_mask */
- false), /* pcrel_offset */
+ 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 */
+ FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_MMIX_16", /* name */
- false, /* partial_inplace */
- 0xffff, /* src_mask */
+ FALSE, /* partial_inplace */
+ 0, /* src_mask */
0xffff, /* dst_mask */
- false), /* pcrel_offset */
+ 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 */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0xffffff, /* src_mask */
0xffffff, /* dst_mask */
- false), /* pcrel_offset */
+ 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 */
+ FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_MMIX_32", /* name */
- false, /* partial_inplace */
- 0xffffffff, /* src_mask */
+ FALSE, /* partial_inplace */
+ 0, /* src_mask */
0xffffffff, /* dst_mask */
- false), /* pcrel_offset */
+ 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 */
+ FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_MMIX_64", /* name */
- false, /* partial_inplace */
- MINUS_ONE, /* src_mask */
+ FALSE, /* partial_inplace */
+ 0, /* src_mask */
MINUS_ONE, /* dst_mask */
- false), /* pcrel_offset */
+ 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 */
+ 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 */
- 0xff, /* src_mask */
+ FALSE, /* partial_inplace */
+ 0, /* src_mask */
0xff, /* dst_mask */
- true), /* pcrel_offset */
+ 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 */
+ 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 */
- 0xffff, /* src_mask */
+ FALSE, /* partial_inplace */
+ 0, /* src_mask */
0xffff, /* dst_mask */
- true), /* pcrel_offset */
+ 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 */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0xffffff, /* src_mask */
0xffffff, /* dst_mask */
- true), /* pcrel_offset */
+ 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 */
+ 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 */
- 0xffffffff, /* src_mask */
+ FALSE, /* partial_inplace */
+ 0, /* src_mask */
0xffffffff, /* dst_mask */
- true), /* pcrel_offset */
+ 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 */
+ 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 */
- MINUS_ONE, /* src_mask */
+ FALSE, /* partial_inplace */
+ 0, /* src_mask */
MINUS_ONE, /* dst_mask */
- true), /* pcrel_offset */
+ 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 */
+ FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
NULL, /* special_function */
"R_MMIX_GNU_VTINHERIT", /* name */
- false, /* partial_inplace */
+ FALSE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
- true), /* pcrel_offset */
+ 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 */
+ 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 */
+ FALSE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
- false), /* pcrel_offset */
+ 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
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
19, /* bitsize */
- true, /* pc_relative */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x0100ffff, /* src_mask */
0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
+ TRUE), /* pcrel_offset */
HOWTO (R_MMIX_GETA_1, /* type */
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
19, /* bitsize */
- true, /* pc_relative */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x0100ffff, /* src_mask */
0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
+ TRUE), /* pcrel_offset */
HOWTO (R_MMIX_GETA_2, /* type */
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
19, /* bitsize */
- true, /* pc_relative */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x0100ffff, /* src_mask */
0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
+ TRUE), /* pcrel_offset */
HOWTO (R_MMIX_GETA_3, /* type */
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
19, /* bitsize */
- true, /* pc_relative */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x0100ffff, /* src_mask */
0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
+ 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
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
19, /* bitsize */
- true, /* pc_relative */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x0100ffff, /* src_mask */
0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
+ TRUE), /* pcrel_offset */
HOWTO (R_MMIX_CBRANCH_J, /* type */
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
19, /* bitsize */
- true, /* pc_relative */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x0100ffff, /* src_mask */
0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
+ TRUE), /* pcrel_offset */
HOWTO (R_MMIX_CBRANCH_1, /* type */
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
19, /* bitsize */
- true, /* pc_relative */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x0100ffff, /* src_mask */
0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
+ TRUE), /* pcrel_offset */
HOWTO (R_MMIX_CBRANCH_2, /* type */
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
19, /* bitsize */
- true, /* pc_relative */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x0100ffff, /* src_mask */
0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
+ TRUE), /* pcrel_offset */
HOWTO (R_MMIX_CBRANCH_3, /* type */
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
19, /* bitsize */
- true, /* pc_relative */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x0100ffff, /* src_mask */
0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
+ 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. The howto members reflect a simple
+ 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 */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x0100ffff, /* src_mask */
0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
+ TRUE), /* pcrel_offset */
HOWTO (R_MMIX_PUSHJ_1, /* type */
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
19, /* bitsize */
- true, /* pc_relative */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x0100ffff, /* src_mask */
0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
+ TRUE), /* pcrel_offset */
HOWTO (R_MMIX_PUSHJ_2, /* type */
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
19, /* bitsize */
- true, /* pc_relative */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x0100ffff, /* src_mask */
0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
+ TRUE), /* pcrel_offset */
HOWTO (R_MMIX_PUSHJ_3, /* type */
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
19, /* bitsize */
- true, /* pc_relative */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x0100ffff, /* src_mask */
0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
+ 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
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
27, /* bitsize */
- true, /* pc_relative */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x1ffffff, /* src_mask */
0x1ffffff, /* dst_mask */
- true), /* pcrel_offset */
+ TRUE), /* pcrel_offset */
HOWTO (R_MMIX_JMP_1, /* type */
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
27, /* bitsize */
- true, /* pc_relative */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x1ffffff, /* src_mask */
0x1ffffff, /* dst_mask */
- true), /* pcrel_offset */
+ TRUE), /* pcrel_offset */
HOWTO (R_MMIX_JMP_2, /* type */
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
27, /* bitsize */
- true, /* pc_relative */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x1ffffff, /* src_mask */
0x1ffffff, /* dst_mask */
- true), /* pcrel_offset */
+ TRUE), /* pcrel_offset */
HOWTO (R_MMIX_JMP_3, /* type */
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
27, /* bitsize */
- true, /* pc_relative */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x1ffffff, /* src_mask */
0x1ffffff, /* dst_mask */
- true), /* pcrel_offset */
+ 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
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
19, /* bitsize */
- true, /* pc_relative */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x0100ffff, /* src_mask */
0x0100ffff, /* dst_mask */
- true), /* pcrel_offset */
+ 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 */
+ 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 */
+ FALSE, /* partial_inplace */
+ ~0x1ffffff, /* src_mask */
0x1ffffff, /* dst_mask */
- true), /* pcrel_offset */
+ TRUE), /* pcrel_offset */
/* A general register or the value 0..255. If a value, then the
instruction (offset -3) needs adjusting. */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
- false, /* pc_relative */
+ 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 */
- 0xff, /* src_mask */
+ FALSE, /* partial_inplace */
+ 0, /* src_mask */
0xff, /* dst_mask */
- false), /* pcrel_offset */
+ 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 */
+ FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
mmix_elf_reloc, /* special_function */
"R_MMIX_REG", /* name */
- false, /* partial_inplace */
- 0xff, /* src_mask */
+ FALSE, /* partial_inplace */
+ 0, /* src_mask */
0xff, /* dst_mask */
- false), /* pcrel_offset */
+ 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
0, /* rightshift */
4, /* size (0 = byte, 1 = short, 2 = long) */
64, /* bitsize */
- false, /* pc_relative */
+ 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 */
- 0xffff, /* src_mask */
+ FALSE, /* partial_inplace */
+ 0, /* src_mask */
0xffff, /* dst_mask */
- false), /* pcrel_offset */
+ FALSE), /* pcrel_offset */
/* A "magic" relocation for a LOCAL expression, asserting that the
expression is less than the number of global registers. No actual
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
- false, /* pc_relative */
+ FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
mmix_elf_reloc, /* special_function */
"R_MMIX_LOCAL", /* name */
- false, /* partial_inplace */
+ FALSE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
- false), /* pcrel_offset */
+ 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 */
};
{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_LOCAL, R_MMIX_LOCAL},
+ {BFD_RELOC_MMIX_PUSHJ_STUBBABLE, R_MMIX_PUSHJ_STUBBABLE}
};
static reloc_howto_type *
-bfd_elf64_bfd_reloc_type_lookup (abfd, code)
- bfd *abfd ATTRIBUTE_UNUSED;
- bfd_reloc_code_real_type code;
+bfd_elf64_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
+ bfd_reloc_code_real_type code)
{
unsigned int i;
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 bfd_boolean
+mmix_elf_new_section_hook (bfd *abfd, asection *sec)
+{
+ if (!sec->used_by_bfd)
+ {
+ struct _mmix_elf_section_data *sdata;
+ bfd_size_type 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
R_MMIX_ADDR19 and R_MMIX_ADDR27 are just filled in. */
static bfd_reloc_status_type
-mmix_elf_perform_relocation (isec, howto, datap, addr, value)
- asection *isec;
- reloc_howto_type *howto;
- PTR datap;
- bfd_vma addr ATTRIBUTE_UNUSED;
- bfd_vma value;
+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;
}
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);
value += addr;
break;
}
- /* FALLTHROUGH. */
+ /* 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. */
if ((bfd_signed_vma) value < 0)
{
- highbit = (1 << 24);
+ highbit = 1 << 24;
value += (1 << (howto->bitsize - 1));
}
else
value >>= 2;
bfd_put_32 (abfd,
- (in1 & ~howto->src_mask)
+ (in1 & howto->src_mask)
| highbit
| (value & howto->dst_mask),
(bfd_byte *) datap);
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)
/* Set the howto pointer for an MMIX ELF reloc (type RELA). */
-static void
-mmix_info_to_howto_rela (abfd, cache_ptr, dst)
- bfd *abfd ATTRIBUTE_UNUSED;
- arelent *cache_ptr;
- Elf64_Internal_Rela *dst;
+static bfd_boolean
+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);
- BFD_ASSERT (r_type < (unsigned int) R_MMIX_max);
+ 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
the reloc_table. We don't get here for final pure ELF linking. */
static bfd_reloc_status_type
-mmix_elf_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 ATTRIBUTE_UNUSED;
+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;
- bfd_vma addr;
r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
input_section, output_bfd, error_message);
return bfd_reloc_undefined;
/* Is the address of the relocation really within the section? */
- if (reloc_entry->address > input_section->_cooked_size)
+ if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
return bfd_reloc_outofrange;
- /* Work out which section the relocation is targetted at and the
+ /* Work out which section the relocation is targeted at and the
initial relocation command value. */
/* Get symbol value. (Common symbols are special.) */
relocation += output_base + symbol->section->output_offset;
- /* Get position of relocation. */
- addr = (reloc_entry->address + input_section->output_section->vma
- + input_section->output_offset);
if (output_bfd != (bfd *) NULL)
{
/* Add in supplied addend. */
data, reloc_entry->address,
reloc_entry->addend, relocation,
bfd_asymbol_name (symbol),
- reloc_target_output_section);
+ reloc_target_output_section,
+ error_message);
}
\f
/* Relocate an MMIX ELF section. Modified from elf32-fr30.c; look to it
for guidance if you're thinking of copying this. */
-static boolean
-mmix_elf_relocate_section (output_bfd, info, input_bfd, input_section,
- contents, relocs, local_syms, local_sections)
- 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;
+static bfd_boolean
+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;
bfd_reloc_status_type r;
const char *name = NULL;
int r_type;
- boolean undefined_signalled = false;
+ bfd_boolean undefined_signalled = FALSE;
r_type = ELF64_R_TYPE (rel->r_info);
r_symndx = ELF64_R_SYM (rel->r_info);
- if (info->relocateable)
- {
- /* This is a relocateable link. We don't have to change
- anything, unless the reloc is against a section symbol,
- in which case we have to adjust according to where the
- section symbol winds up in the output section. */
- if (r_symndx < symtab_hdr->sh_info)
- {
- sym = local_syms + r_symndx;
-
- if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
- {
- sec = local_sections [r_symndx];
- rel->r_addend += sec->output_offset + sym->st_value;
- }
- }
-
- continue;
- }
-
- /* This is a final link. */
howto = elf_mmix_howto_table + ELF64_R_TYPE (rel->r_info);
h = NULL;
sym = NULL;
{
sym = local_syms + r_symndx;
sec = local_sections [r_symndx];
- relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
+ 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);
- name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
+ name = bfd_elf_string_from_elf_section (input_bfd,
+ symtab_hdr->sh_link,
+ sym->st_name);
+ if (name == NULL)
+ name = bfd_section_name (input_bfd, sec);
}
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;
+ bfd_boolean 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 (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- {
- sec = h->root.u.def.section;
- relocation = (h->root.u.def.value
- + sec->output_section->vma
- + sec->output_offset);
- }
- else if (h->root.type == bfd_link_hash_undefweak)
- relocation = 0;
- else if (info->shared
- && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
- relocation = 0;
- else
+ 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)
{
- /* The test on undefined_signalled is redundant at the
- moment, but kept for symmetry. */
- if (! undefined_signalled
- && ! ((*info->callbacks->undefined_symbol)
- (info, h->root.root.string, input_bfd,
- input_section, rel->r_offset, true)))
- return false;
- undefined_signalled = true;
- relocation = 0;
+ /* 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);
+ rel->r_addend, relocation, name, sec, NULL);
if (r != bfd_reloc_ok)
{
- boolean check_ok = true;
const char * msg = (const char *) NULL;
switch (r)
{
case bfd_reloc_overflow:
- check_ok = info->callbacks->reloc_overflow
- (info, name, howto->name, (bfd_vma) 0,
- input_bfd, input_section, rel->r_offset);
+ 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)
- check_ok = info->callbacks->undefined_symbol
- (info, name, input_bfd, input_section, rel->r_offset,
- true);
- undefined_signalled = true;
+ info->callbacks->undefined_symbol
+ (info, name, input_bfd, input_section, rel->r_offset, TRUE);
+ undefined_signalled = TRUE;
break;
case bfd_reloc_outofrange:
}
if (msg)
- check_ok = info->callbacks->warning
- (info, msg, name, input_bfd, input_section, rel->r_offset);
-
- if (! check_ok)
- return false;
+ (*info->callbacks->warning) (info, msg, name, input_bfd,
+ input_section, rel->r_offset);
}
}
- return true;
+ return TRUE;
}
\f
/* 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 (howto, input_section, contents,
- r_offset, r_addend, relocation, symname, symsec)
- 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;
+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
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:
+ r_offset);
r = mmix_elf_perform_relocation (input_section, howto, contents,
- addr, srel);
+ 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_get_section_name (symsec->owner, symsec),
+ MMIX_REG_CONTENTS_SECTION_NAME) == 0
+ || strcmp (bfd_get_section_name (symsec->owner, 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
}
else
{
- /* Note: This is seperated out into two messages in order
+ /* 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)
- (_("%s: register relocation against non-register symbol: (unknown) in %s"),
- bfd_get_filename (input_section->owner),
- bfd_get_section_name (symsec->owner, symsec));
+ _bfd_error_handler
+ /* xgettext:c-format */
+ (_("%pB: register relocation against non-register symbol:"
+ " (unknown) in %pA"),
+ input_section->owner, symsec);
else
- (*_bfd_error_handler)
- (_("%s: register relocation against non-register symbol: %s in %s"),
- bfd_get_filename (input_section->owner), symname,
- bfd_get_section_name (symsec->owner, symsec));
+ _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);
+ addr, srel, error_message);
break;
case R_MMIX_LOCAL:
&& strcmp (bfd_get_section_name (symsec->owner, symsec),
MMIX_REG_SECTION_NAME) != 0)
{
- (*_bfd_error_handler)
- (_("%s: directive LOCAL valid only with a register or absolute value"),
- bfd_get_filename (input_section->owner));
+ _bfd_error_handler
+ (_("%pB: directive LOCAL valid only with a register or absolute value"),
+ input_section->owner);
return bfd_reloc_overflow;
}
first_global = 255;
else
{
- first_global = bfd_get_section_vma (abfd, regsec) / 8;
+ first_global
+ = bfd_get_section_vma (input_section->output_section->owner,
+ regsec) / 8;
if (strcmp (bfd_get_section_name (symsec->owner, symsec),
MMIX_REG_CONTENTS_SECTION_NAME) == 0)
{
if ((bfd_vma) srel >= first_global)
{
/* FIXME: Better error message. */
- (*_bfd_error_handler)
- (_("%s: LOCAL directive: Register $%ld is not a local register. First global register is $%ld."),
- bfd_get_filename (input_section->owner), (long) srel, (long) first_global);
+ _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;
}
relocation. */
static asection *
-mmix_elf_gc_mark_hook (abfd, info, rel, h, sym)
- bfd *abfd;
- struct bfd_link_info *info ATTRIBUTE_UNUSED;
- Elf_Internal_Rela *rel;
- struct elf_link_hash_entry *h;
- Elf_Internal_Sym *sym;
+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:
- 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;
-
- default:
- break;
- }
- }
- }
- else
- {
- return bfd_section_from_elf_index (abfd, sym->st_shndx);
- }
+ switch (ELF64_R_TYPE (rel->r_info))
+ {
+ case R_MMIX_GNU_VTINHERIT:
+ case R_MMIX_GNU_VTENTRY:
+ return NULL;
+ }
- return NULL;
+ return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
}
\f
/* Sort register relocs to come before expanding relocs. */
static int
-mmix_elf_sort_relocs (p1, p2)
- const PTR p1;
- const PTR p2;
+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;
return 0;
}
+/* Subset of mmix_elf_check_relocs, common to ELF and mmo linking. */
+
+static bfd_boolean
+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 (bpo_greg_owner,
+ 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 boolean
-mmix_elf_check_relocs (abfd, info, sec, relocs)
- bfd *abfd;
- struct bfd_link_info *info;
- asection *sec;
- const Elf_Internal_Rela *relocs;
+static bfd_boolean
+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, **sym_hashes_end;
+ struct elf_link_hash_entry **sym_hashes;
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(Elf64_External_Sym);
- if (!elf_bad_symtab (abfd))
- sym_hashes_end -= symtab_hdr->sh_info;
/* First we sort the relocs so that any register relocs come before
expansion-relocs to the same insn. FIXME: Not done for mmo. */
- qsort ((PTR) relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
+ 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++)
{
r_symndx = ELF64_R_SYM (rel->r_info);
if (r_symndx < symtab_hdr->sh_info)
- h = NULL;
+ h = NULL;
else
- h = sym_hashes[r_symndx - symtab_hdr->sh_info];
+ {
+ 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_elf64_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_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend))
- return false;
- break;
- }
+ {
+ /* 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:
+ BFD_ASSERT (h != NULL);
+ if (h != NULL
+ && !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. */
+
+bfd_boolean
+_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;
+ bfd_boolean 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;
+ return TRUE;
}
\f
/* 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 boolean
-mmix_elf_link_output_symbol_hook (abfd, info, name, sym, input_sec)
- bfd *abfd ATTRIBUTE_UNUSED;
- struct bfd_link_info *info ATTRIBUTE_UNUSED;
- const char *name ATTRIBUTE_UNUSED;
- Elf_Internal_Sym *sym;
- asection *input_sec;
+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
sym->st_shndx = SHN_REGISTER;
}
- return true;
+ return 1;
}
/* We fake a register section that holds values that are register numbers.
static asymbol mmix_elf_reg_section_symbol;
static asymbol *mmix_elf_reg_section_symbol_ptr;
-/* Handle the special MIPS section numbers that a symbol may use.
- This is used for both the 32-bit and the 64-bit ABI. */
+/* Handle the special section numbers that a symbol may use. */
void
-mmix_elf_symbol_processing (abfd, asym)
- bfd *abfd ATTRIBUTE_UNUSED;
- asymbol *asym;
+mmix_elf_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, asymbol *asym)
{
elf_symbol_type *elfsym;
/* Given a BFD section, try to locate the corresponding ELF section
index. */
-static boolean
-mmix_elf_section_from_bfd_section (abfd, sec, retval)
- bfd * abfd ATTRIBUTE_UNUSED;
- asection * sec;
- int * retval;
+static bfd_boolean
+mmix_elf_section_from_bfd_section (bfd * abfd ATTRIBUTE_UNUSED,
+ asection * sec,
+ int * retval)
{
if (strcmp (bfd_get_section_name (abfd, sec), MMIX_REG_SECTION_NAME) == 0)
*retval = SHN_REGISTER;
else
- return false;
+ return FALSE;
- return true;
+ return TRUE;
}
/* Hook called by the linker routine which adds symbols from an object
symbols, since otherwise having two with the same value would cause
them to be "merged", but with the contents serialized. */
-boolean
-mmix_elf_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp)
- bfd *abfd;
- struct bfd_link_info *info ATTRIBUTE_UNUSED;
- const Elf_Internal_Sym *sym;
- const char **namep ATTRIBUTE_UNUSED;
- flagword *flagsp ATTRIBUTE_UNUSED;
- asection **secp;
- bfd_vma *valp ATTRIBUTE_UNUSED;
+static bfd_boolean
+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 = bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME);
+ (*secp)->flags |= SEC_LINKER_CREATED;
+ }
else if ((*namep)[0] == '_' && (*namep)[1] == '_' && (*namep)[2] == '.'
- && strncmp (*namep, MMIX_LOC_SECTION_START_SYMBOL_PREFIX,
- strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX)) == 0)
+ && CONST_STRNEQ (*namep, MMIX_LOC_SECTION_START_SYMBOL_PREFIX))
{
/* See if we have another one. */
- struct elf_link_hash_entry *h
- = (struct elf_link_hash_entry *) bfd_link_hash_lookup (info->hash,
- *namep,
- false,
- false, false);
+ struct bfd_link_hash_entry *h = bfd_link_hash_lookup (info->hash,
+ *namep,
+ FALSE,
+ FALSE,
+ FALSE);
- if (h != NULL && h->root.type != bfd_link_hash_undefined)
+ if (h != NULL && h->type != bfd_link_hash_undefined)
{
/* How do we get the asymbol (or really: the filename) from h?
- h->root.u.def.section->owner is NULL. */
- ((*_bfd_error_handler)
- (_("%s: Error: multiple definition of `%s'; start of %s is set in a earlier linked file\n"),
- bfd_get_filename (abfd), *namep,
- *namep + strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX)));
+ 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 FALSE;
}
}
- return true;
+ return TRUE;
}
/* We consider symbols matching "L.*:[0-9]+" to be local symbols. */
-boolean
-mmix_elf_is_local_label_name (abfd, name)
- bfd *abfd;
- const char *name;
+static bfd_boolean
+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;
+ return TRUE;
if (*name != 'L')
- return false;
+ 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;
+ return FALSE;
/* Check that there are remaining characters and that they are digits. */
if (colpos[1] == 0)
- return false;
+ return FALSE;
digits = strspn (colpos + 1, "0123456789");
return digits != 0 && colpos[1 + digits] == 0;
/* We get rid of the register section here. */
-boolean
-mmix_elf_final_link (abfd, info)
- bfd *abfd;
- struct bfd_link_info *info;
+bfd_boolean
+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;
- asection **secpp;
reg_section = bfd_get_section_by_name (abfd, MMIX_REG_SECTION_NAME);
{
/* FIXME: Pass error state gracefully. */
if (bfd_get_section_flags (abfd, reg_section) & SEC_HAS_CONTENTS)
- _bfd_abort (__FILE__, __LINE__, _("Register section has contents\n"));
-
- /* Really remove the section. */
- for (secpp = &abfd->sections;
- *secpp != reg_section;
- secpp = &(*secpp)->next)
- ;
- bfd_section_list_remove (abfd, secpp);
- --abfd->section_count;
+ _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_elf64_bfd_final_link (abfd, info))
- return false;
+ if (! bfd_elf_final_link (abfd, info))
+ return FALSE;
- return true;
+ /* 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. */
+
+bfd_boolean
+_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_greg_owner, 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;
+}
+\f
+/* Fill in contents in the linker allocated gregs. Everything is
+ calculated at this point; we just move the contents into place here. */
+
+bfd_boolean
+_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 bfd_boolean
+mmix_elf_relax_section (bfd *abfd,
+ asection *sec,
+ struct bfd_link_info *link_info,
+ bfd_boolean *again)
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ Elf_Internal_Rela *internal_relocs;
+ Elf_Internal_Rela *irel, *irelend;
+ 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;
+ 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++;
+ }
+ 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 == mmix_elf_section_data (sec)->pjs.n_pushj_relocs);
+
+ if (internal_relocs != NULL
+ && 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 (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents)
+ free (isymbuf);
+ if (internal_relocs != NULL
+ && elf_section_data (sec)->relocs != internal_relocs)
+ free (internal_relocs);
+ return FALSE;
}
\f
#define ELF_ARCH bfd_arch_mmix
-#define ELF_MACHINE_CODE EM_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
alignment. */
#define ELF_MAXPAGESIZE 0x100
-#define TARGET_BIG_SYM bfd_elf64_mmix_vec
+#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_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"
projects / thirdparty / binutils-gdb.git / blobdiff