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gnu / binutils-gdb / 511c6575b2febee533a4d8796647bbabc2c27249 / . / bfd / elf32-nios2.c
blob: f6580af95190315c2150700cb99ab4d4b670c1c9 [file] [log] [blame]
/* 32-bit ELF support for Nios II.
Copyright (C) 2012-2024 Free Software Foundation, Inc.
Contributed by Nigel Gray (ngray@altera.com).
Contributed by Mentor Graphics, Inc.
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
/* This file handles Altera Nios II ELF targets. */
#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "bfdlink.h"
#include "genlink.h"
#include "elf-bfd.h"
#include "elf/nios2.h"
#include "opcode/nios2.h"
#include "elf32-nios2.h"
#include "libiberty.h"
/* Use RELA relocations. */
#ifndef USE_RELA
#define USE_RELA
#endif
#ifdef USE_REL
#undef USE_REL
#endif
/* Forward declarations. */
static bfd_reloc_status_type nios2_elf32_ignore_reloc
(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
static bfd_reloc_status_type nios2_elf32_hi16_relocate
(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
static bfd_reloc_status_type nios2_elf32_lo16_relocate
(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
static bfd_reloc_status_type nios2_elf32_hiadj16_relocate
(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
static bfd_reloc_status_type nios2_elf32_pcrel_lo16_relocate
(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
static bfd_reloc_status_type nios2_elf32_pcrel_hiadj16_relocate
(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
static bfd_reloc_status_type nios2_elf32_pcrel16_relocate
(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
static bfd_reloc_status_type nios2_elf32_call26_relocate
(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
static bfd_reloc_status_type nios2_elf32_gprel_relocate
(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
static bfd_reloc_status_type nios2_elf32_ujmp_relocate
(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
static bfd_reloc_status_type nios2_elf32_cjmp_relocate
(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
static bfd_reloc_status_type nios2_elf32_callr_relocate
(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
/* Target vector. */
extern const bfd_target nios2_elf32_le_vec;
extern const bfd_target nios2_elf32_be_vec;
/* Offset of tp and dtp pointers from start of TLS block. */
#define TP_OFFSET 0x7000
#define DTP_OFFSET 0x8000
/* The relocation tables used for SHT_REL sections. There are separate
tables for R1 and R2 encodings. */
static reloc_howto_type elf_nios2_r1_howto_table_rel[] = {
/* No relocation. */
HOWTO (R_NIOS2_NONE, /* type */
0, /* rightshift */
0, /* size */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_NIOS2_NONE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* 16-bit signed immediate relocation. */
HOWTO (R_NIOS2_S16, /* type */
0, /* rightshift */
4, /* size */
16, /* bitsize */
false, /* pc_relative */
6, /* bitpos */
complain_overflow_signed, /* complain on overflow */
bfd_elf_generic_reloc, /* special function */
"R_NIOS2_S16", /* name */
false, /* partial_inplace */
0x003fffc0, /* src_mask */
0x003fffc0, /* dest_mask */
false), /* pcrel_offset */
/* 16-bit unsigned immediate relocation. */
HOWTO (R_NIOS2_U16, /* type */
0, /* rightshift */
4, /* size */
16, /* bitsize */
false, /* pc_relative */
6, /* bitpos */
complain_overflow_unsigned, /* complain on overflow */
bfd_elf_generic_reloc, /* special function */
"R_NIOS2_U16", /* name */
false, /* partial_inplace */
0x003fffc0, /* src_mask */
0x003fffc0, /* dest_mask */
false), /* pcrel_offset */
HOWTO (R_NIOS2_PCREL16, /* type */
0, /* rightshift */
4, /* size */
16, /* bitsize */
true, /* pc_relative */
6, /* bitpos */
complain_overflow_signed, /* complain on overflow */
nios2_elf32_pcrel16_relocate, /* special function */
"R_NIOS2_PCREL16", /* name */
false, /* partial_inplace */
0x003fffc0, /* src_mask */
0x003fffc0, /* dest_mask */
true), /* pcrel_offset */
HOWTO (R_NIOS2_CALL26, /* type */
2, /* rightshift */
4, /* size */
26, /* bitsize */
false, /* pc_relative */
6, /* bitpos */
complain_overflow_dont, /* complain on overflow */
nios2_elf32_call26_relocate, /* special function */
"R_NIOS2_CALL26", /* name */
false, /* partial_inplace */
0xffffffc0, /* src_mask */
0xffffffc0, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_NIOS2_IMM5,
0,
4,
5,
false,
6,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_IMM5",
false,
0x000007c0,
0x000007c0,
false),
HOWTO (R_NIOS2_CACHE_OPX,
0,
4,
5,
false,
22,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_CACHE_OPX",
false,
0x07c00000,
0x07c00000,
false),
HOWTO (R_NIOS2_IMM6,
0,
4,
6,
false,
6,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_IMM6",
false,
0x00000fc0,
0x00000fc0,
false),
HOWTO (R_NIOS2_IMM8,
0,
4,
8,
false,
6,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_IMM8",
false,
0x00003fc0,
0x00003fc0,
false),
HOWTO (R_NIOS2_HI16,
0,
4,
32,
false,
6,
complain_overflow_dont,
nios2_elf32_hi16_relocate,
"R_NIOS2_HI16",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_LO16,
0,
4,
32,
false,
6,
complain_overflow_dont,
nios2_elf32_lo16_relocate,
"R_NIOS2_LO16",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_HIADJ16,
0,
4,
32,
false,
6,
complain_overflow_dont,
nios2_elf32_hiadj16_relocate,
"R_NIOS2_HIADJ16",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_BFD_RELOC_32,
0,
4, /* long */
32,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_BFD_RELOC32",
false,
0xffffffff,
0xffffffff,
false),
HOWTO (R_NIOS2_BFD_RELOC_16,
0,
2, /* short */
16,
false,
0,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_BFD_RELOC16",
false,
0x0000ffff,
0x0000ffff,
false),
HOWTO (R_NIOS2_BFD_RELOC_8,
0,
1, /* byte */
8,
false,
0,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_BFD_RELOC8",
false,
0x000000ff,
0x000000ff,
false),
HOWTO (R_NIOS2_GPREL,
0,
4,
32,
false,
6,
complain_overflow_dont,
nios2_elf32_gprel_relocate,
"R_NIOS2_GPREL",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_GNU_VTINHERIT,
0,
4,
0,
false,
0,
complain_overflow_dont,
NULL,
"R_NIOS2_GNU_VTINHERIT",
false,
0,
0,
false),
HOWTO (R_NIOS2_GNU_VTENTRY,
0,
4,
0,
false,
0,
complain_overflow_dont,
_bfd_elf_rel_vtable_reloc_fn,
"R_NIOS2_GNU_VTENTRY",
false,
0,
0,
false),
HOWTO (R_NIOS2_UJMP,
0,
4,
32,
false,
6,
complain_overflow_dont,
nios2_elf32_ujmp_relocate,
"R_NIOS2_UJMP",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_CJMP,
0,
4,
32,
false,
6,
complain_overflow_dont,
nios2_elf32_cjmp_relocate,
"R_NIOS2_CJMP",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_CALLR,
0,
4,
32,
false,
6,
complain_overflow_dont,
nios2_elf32_callr_relocate,
"R_NIOS2_CALLR",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_ALIGN,
0,
4,
0,
false,
0,
complain_overflow_dont,
nios2_elf32_ignore_reloc,
"R_NIOS2_ALIGN",
false,
0,
0,
true),
HOWTO (R_NIOS2_GOT16,
0,
4,
16,
false,
6,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_GOT16",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_CALL16,
0,
4,
16,
false,
6,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_CALL16",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_GOTOFF_LO,
0,
4,
16,
false,
6,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_GOTOFF_LO",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_GOTOFF_HA,
0,
4,
16,
false,
6,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_GOTOFF_HA",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_PCREL_LO,
0,
4,
16,
true,
6,
complain_overflow_dont,
nios2_elf32_pcrel_lo16_relocate,
"R_NIOS2_PCREL_LO",
false,
0x003fffc0,
0x003fffc0,
true),
HOWTO (R_NIOS2_PCREL_HA,
0,
4,
16,
false, /* This is a PC-relative relocation, but we need to subtract
PC ourselves before the HIADJ. */
6,
complain_overflow_dont,
nios2_elf32_pcrel_hiadj16_relocate,
"R_NIOS2_PCREL_HA",
false,
0x003fffc0,
0x003fffc0,
true),
HOWTO (R_NIOS2_TLS_GD16,
0,
4,
16,
false,
6,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_TLS_GD16",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_TLS_LDM16,
0,
4,
16,
false,
6,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_TLS_LDM16",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_TLS_LDO16,
0,
4,
16,
false,
6,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_TLS_LDO16",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_TLS_IE16,
0,
4,
16,
false,
6,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_TLS_IE16",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_TLS_LE16,
0,
4,
16,
false,
6,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_TLS_LE16",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_TLS_DTPMOD,
0,
4,
32,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_TLS_DTPMOD",
false,
0xffffffff,
0xffffffff,
false),
HOWTO (R_NIOS2_TLS_DTPREL,
0,
4,
32,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_TLS_DTPREL",
false,
0xffffffff,
0xffffffff,
false),
HOWTO (R_NIOS2_TLS_TPREL,
0,
4,
32,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_TLS_TPREL",
false,
0xffffffff,
0xffffffff,
false),
HOWTO (R_NIOS2_COPY,
0,
4,
32,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_COPY",
false,
0,
0,
false),
HOWTO (R_NIOS2_GLOB_DAT,
0,
4,
32,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_GLOB_DAT",
false,
0xffffffff,
0xffffffff,
false),
HOWTO (R_NIOS2_JUMP_SLOT,
0,
4,
32,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_JUMP_SLOT",
false,
0xffffffff,
0xffffffff,
false),
HOWTO (R_NIOS2_RELATIVE,
0,
4,
32,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_RELATIVE",
false,
0xffffffff,
0xffffffff,
false),
HOWTO (R_NIOS2_GOTOFF,
0,
4,
32,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_GOTOFF",
false,
0xffffffff,
0xffffffff,
false),
HOWTO (R_NIOS2_CALL26_NOAT, /* type */
2, /* rightshift */
4, /* size */
26, /* bitsize */
false, /* pc_relative */
6, /* bitpos */
complain_overflow_dont, /* complain on overflow */
nios2_elf32_call26_relocate, /* special function */
"R_NIOS2_CALL26_NOAT", /* name */
false, /* partial_inplace */
0xffffffc0, /* src_mask */
0xffffffc0, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_NIOS2_GOT_LO,
0,
4,
16,
false,
6,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_GOT_LO",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_GOT_HA,
0,
4,
16,
false,
6,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_GOT_HA",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_CALL_LO,
0,
4,
16,
false,
6,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_CALL_LO",
false,
0x003fffc0,
0x003fffc0,
false),
HOWTO (R_NIOS2_CALL_HA,
0,
4,
16,
false,
6,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_CALL_HA",
false,
0x003fffc0,
0x003fffc0,
false),
/* Add other relocations here. */
};
static reloc_howto_type elf_nios2_r2_howto_table_rel[] = {
/* No relocation. */
HOWTO (R_NIOS2_NONE, /* type */
0, /* rightshift */
0, /* size */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_NIOS2_NONE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* 16-bit signed immediate relocation. */
HOWTO (R_NIOS2_S16, /* type */
0, /* rightshift */
4, /* size */
16, /* bitsize */
false, /* pc_relative */
16, /* bitpos */
complain_overflow_signed, /* complain on overflow */
bfd_elf_generic_reloc, /* special function */
"R_NIOS2_S16", /* name */
false, /* partial_inplace */
0xffff0000, /* src_mask */
0xffff0000, /* dest_mask */
false), /* pcrel_offset */
/* 16-bit unsigned immediate relocation. */
HOWTO (R_NIOS2_U16, /* type */
0, /* rightshift */
4, /* size */
16, /* bitsize */
false, /* pc_relative */
16, /* bitpos */
complain_overflow_unsigned, /* complain on overflow */
bfd_elf_generic_reloc, /* special function */
"R_NIOS2_U16", /* name */
false, /* partial_inplace */
0xffff0000, /* src_mask */
0xffff0000, /* dest_mask */
false), /* pcrel_offset */
HOWTO (R_NIOS2_PCREL16, /* type */
0, /* rightshift */
4, /* size */
16, /* bitsize */
true, /* pc_relative */
16, /* bitpos */
complain_overflow_signed, /* complain on overflow */
nios2_elf32_pcrel16_relocate, /* special function */
"R_NIOS2_PCREL16", /* name */
false, /* partial_inplace */
0xffff0000, /* src_mask */
0xffff0000, /* dest_mask */
true), /* pcrel_offset */
HOWTO (R_NIOS2_CALL26, /* type */
2, /* rightshift */
4, /* size */
26, /* bitsize */
false, /* pc_relative */
6, /* bitpos */
complain_overflow_dont, /* complain on overflow */
nios2_elf32_call26_relocate, /* special function */
"R_NIOS2_CALL26", /* name */
false, /* partial_inplace */
0xffffffc0, /* src_mask */
0xffffffc0, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_NIOS2_IMM5,
0,
4,
5,
false,
21,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_IMM5",
false,
0x03e00000,
0x03e00000,
false),
HOWTO (R_NIOS2_CACHE_OPX,
0,
4,
5,
false,
11,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_CACHE_OPX",
false,
0x0000f800,
0x0000f800,
false),
HOWTO (R_NIOS2_IMM6,
0,
4,
6,
false,
26,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_IMM6",
false,
0xfc000000,
0xfc000000,
false),
HOWTO (R_NIOS2_IMM8,
0,
4,
8,
false,
24,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_IMM8",
false,
0xff000000,
0xff000000,
false),
HOWTO (R_NIOS2_HI16,
0,
4,
32,
false,
16,
complain_overflow_dont,
nios2_elf32_hi16_relocate,
"R_NIOS2_HI16",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_LO16,
0,
4,
32,
false,
16,
complain_overflow_dont,
nios2_elf32_lo16_relocate,
"R_NIOS2_LO16",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_HIADJ16,
0,
4,
32,
false,
16,
complain_overflow_dont,
nios2_elf32_hiadj16_relocate,
"R_NIOS2_HIADJ16",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_BFD_RELOC_32,
0,
4, /* long */
32,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_BFD_RELOC32",
false,
0xffffffff,
0xffffffff,
false),
HOWTO (R_NIOS2_BFD_RELOC_16,
0,
2, /* short */
16,
false,
0,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_BFD_RELOC16",
false,
0x0000ffff,
0x0000ffff,
false),
HOWTO (R_NIOS2_BFD_RELOC_8,
0,
1, /* byte */
8,
false,
0,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_BFD_RELOC8",
false,
0x000000ff,
0x000000ff,
false),
HOWTO (R_NIOS2_GPREL,
0,
4,
32,
false,
16,
complain_overflow_dont,
nios2_elf32_gprel_relocate,
"R_NIOS2_GPREL",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_GNU_VTINHERIT,
0,
4,
0,
false,
0,
complain_overflow_dont,
NULL,
"R_NIOS2_GNU_VTINHERIT",
false,
0,
0,
false),
HOWTO (R_NIOS2_GNU_VTENTRY,
0,
4,
0,
false,
0,
complain_overflow_dont,
_bfd_elf_rel_vtable_reloc_fn,
"R_NIOS2_GNU_VTENTRY",
false,
0,
0,
false),
HOWTO (R_NIOS2_UJMP,
0,
4,
32,
false,
16,
complain_overflow_dont,
nios2_elf32_ujmp_relocate,
"R_NIOS2_UJMP",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_CJMP,
0,
4,
32,
false,
16,
complain_overflow_dont,
nios2_elf32_cjmp_relocate,
"R_NIOS2_CJMP",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_CALLR,
0,
4,
32,
false,
16,
complain_overflow_dont,
nios2_elf32_callr_relocate,
"R_NIOS2_CALLR",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_ALIGN,
0,
4,
0,
false,
0,
complain_overflow_dont,
nios2_elf32_ignore_reloc,
"R_NIOS2_ALIGN",
false,
0,
0,
true),
HOWTO (R_NIOS2_GOT16,
0,
4,
16,
false,
16,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_GOT16",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_CALL16,
0,
4,
16,
false,
16,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_CALL16",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_GOTOFF_LO,
0,
4,
16,
false,
16,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_GOTOFF_LO",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_GOTOFF_HA,
0,
4,
16,
false,
16,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_GOTOFF_HA",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_PCREL_LO,
0,
4,
16,
true,
16,
complain_overflow_dont,
nios2_elf32_pcrel_lo16_relocate,
"R_NIOS2_PCREL_LO",
false,
0xffff0000,
0xffff0000,
true),
HOWTO (R_NIOS2_PCREL_HA,
0,
4,
16,
false, /* This is a PC-relative relocation, but we need to subtract
PC ourselves before the HIADJ. */
16,
complain_overflow_dont,
nios2_elf32_pcrel_hiadj16_relocate,
"R_NIOS2_PCREL_HA",
false,
0xffff0000,
0xffff0000,
true),
HOWTO (R_NIOS2_TLS_GD16,
0,
4,
16,
false,
16,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_TLS_GD16",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_TLS_LDM16,
0,
4,
16,
false,
16,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_TLS_LDM16",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_TLS_LDO16,
0,
4,
16,
false,
16,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_TLS_LDO16",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_TLS_IE16,
0,
4,
16,
false,
16,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_TLS_IE16",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_TLS_LE16,
0,
4,
16,
false,
16,
complain_overflow_bitfield,
bfd_elf_generic_reloc,
"R_NIOS2_TLS_LE16",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_TLS_DTPMOD,
0,
4,
32,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_TLS_DTPMOD",
false,
0xffffffff,
0xffffffff,
false),
HOWTO (R_NIOS2_TLS_DTPREL,
0,
4,
32,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_TLS_DTPREL",
false,
0xffffffff,
0xffffffff,
false),
HOWTO (R_NIOS2_TLS_TPREL,
0,
4,
32,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_TLS_TPREL",
false,
0xffffffff,
0xffffffff,
false),
HOWTO (R_NIOS2_COPY,
0,
4,
32,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_COPY",
false,
0,
0,
false),
HOWTO (R_NIOS2_GLOB_DAT,
0,
4,
32,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_GLOB_DAT",
false,
0xffffffff,
0xffffffff,
false),
HOWTO (R_NIOS2_JUMP_SLOT,
0,
4,
32,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_JUMP_SLOT",
false,
0xffffffff,
0xffffffff,
false),
HOWTO (R_NIOS2_RELATIVE,
0,
4,
32,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_RELATIVE",
false,
0xffffffff,
0xffffffff,
false),
HOWTO (R_NIOS2_GOTOFF,
0,
4,
32,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_GOTOFF",
false,
0xffffffff,
0xffffffff,
false),
HOWTO (R_NIOS2_CALL26_NOAT, /* type */
2, /* rightshift */
4, /* size */
26, /* bitsize */
false, /* pc_relative */
6, /* bitpos */
complain_overflow_dont, /* complain on overflow */
nios2_elf32_call26_relocate, /* special function */
"R_NIOS2_CALL26_NOAT", /* name */
false, /* partial_inplace */
0xffffffc0, /* src_mask */
0xffffffc0, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_NIOS2_GOT_LO,
0,
4,
16,
false,
16,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_GOT_LO",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_GOT_HA,
0,
4,
16,
false,
16,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_GOT_HA",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_CALL_LO,
0,
4,
16,
false,
16,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_CALL_LO",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_CALL_HA,
0,
4,
16,
false,
16,
complain_overflow_dont,
bfd_elf_generic_reloc,
"R_NIOS2_CALL_HA",
false,
0xffff0000,
0xffff0000,
false),
HOWTO (R_NIOS2_R2_S12,
0,
4,
12,
false,
16,
complain_overflow_signed,
bfd_elf_generic_reloc,
"R_NIOS2_R2_S12",
false,
0x0fff0000,
0x0fff0000,
false),
HOWTO (R_NIOS2_R2_I10_1_PCREL,
1,
2,
10,
true,
6,
complain_overflow_signed,
bfd_elf_generic_reloc, /* FIXME? */
"R_NIOS2_R2_I10_1_PCREL",
false,
0xffc0,
0xffc0,
true),
HOWTO (R_NIOS2_R2_T1I7_1_PCREL,
1,
2,
7,
true,
9,
complain_overflow_signed,
bfd_elf_generic_reloc, /* FIXME? */
"R_NIOS2_R2_T1I7_1_PCREL",
false,
0xfe00,
0xfe00,
true),
HOWTO (R_NIOS2_R2_T1I7_2,
2,
2,
7,
false,
9,
complain_overflow_unsigned,
bfd_elf_generic_reloc,
"R_NIOS2_R2_T1I7_2",
false,
0xfe00,
0xfe00,
false),
HOWTO (R_NIOS2_R2_T2I4,
0,
2,
4,
false,
12,
complain_overflow_unsigned,
bfd_elf_generic_reloc,
"R_NIOS2_R2_T2I4",
false,
0xf000,
0xf000,
false),
HOWTO (R_NIOS2_R2_T2I4_1,
1,
2,
4,
false,
12,
complain_overflow_unsigned,
bfd_elf_generic_reloc,
"R_NIOS2_R2_T2I4_1",
false,
0xf000,
0xf000,
false),
HOWTO (R_NIOS2_R2_T2I4_2,
2,
2,
4,
false,
12,
complain_overflow_unsigned,
bfd_elf_generic_reloc,
"R_NIOS2_R2_T2I4_2",
false,
0xf000,
0xf000,
false),
HOWTO (R_NIOS2_R2_X1I7_2,
2,
2,
7,
false,
6,
complain_overflow_unsigned,
bfd_elf_generic_reloc,
"R_NIOS2_R2_X1I7_2",
false,
0x1fc0,
0x1fc0,
false),
HOWTO (R_NIOS2_R2_X2L5,
0,
2,
5,
false,
6,
complain_overflow_unsigned,
bfd_elf_generic_reloc,
"R_NIOS2_R2_X2L5",
false,
0x07c0,
0x07c0,
false),
HOWTO (R_NIOS2_R2_F1I5_2,
2,
2,
5,
false,
6,
complain_overflow_unsigned,
bfd_elf_generic_reloc,
"R_NIOS2_R2_F1L5_2",
false,
0x07c0,
0x07c0,
false),
HOWTO (R_NIOS2_R2_L5I4X1,
2,
2,
4,
false,
6,
complain_overflow_unsigned,
bfd_elf_generic_reloc,
"R_NIOS2_R2_L5I4X1",
false,
0x03c0,
0x03c0,
false),
HOWTO (R_NIOS2_R2_T1X1I6,
0,
2,
6,
false,
9,
complain_overflow_unsigned,
bfd_elf_generic_reloc,
"R_NIOS2_R2_T1X1I6",
false,
0x7e00,
0x7e00,
false),
HOWTO (R_NIOS2_R2_T1X1I6_2,
2,
4,
6,
false,
9,
complain_overflow_unsigned,
bfd_elf_generic_reloc,
"R_NIOS2_R2_T1I1X6_2",
false,
0x7e00,
0x7e00,
false),
/* Add other relocations here. */
};
static unsigned char elf_code_to_howto_index[R_NIOS2_ILLEGAL + 1];
/* Return true if producing output for a R2 BFD. */
#define BFD_IS_R2(abfd) (bfd_get_mach (abfd) == bfd_mach_nios2r2)
/* Return the howto for relocation RTYPE. */
static reloc_howto_type *
lookup_howto (unsigned int rtype, bfd *abfd)
{
static int initialized = 0;
int i;
/* R2 relocations are a superset of R1, so use that for the lookup
table. */
int r1_howto_tbl_size = (int) ARRAY_SIZE (elf_nios2_r1_howto_table_rel);
int r2_howto_tbl_size = (int) ARRAY_SIZE (elf_nios2_r2_howto_table_rel);
if (!initialized)
{
initialized = 1;
memset (elf_code_to_howto_index, 0xff,
sizeof (elf_code_to_howto_index));
for (i = 0; i < r2_howto_tbl_size; i++)
{
elf_code_to_howto_index[elf_nios2_r2_howto_table_rel[i].type] = i;
if (i < r1_howto_tbl_size)
BFD_ASSERT (elf_nios2_r2_howto_table_rel[i].type
== elf_nios2_r1_howto_table_rel[i].type);
}
}
if (rtype > R_NIOS2_ILLEGAL)
return NULL;
i = elf_code_to_howto_index[rtype];
if (BFD_IS_R2 (abfd))
{
if (i >= r2_howto_tbl_size)
return NULL;
return elf_nios2_r2_howto_table_rel + i;
}
else
{
if (i >= r1_howto_tbl_size)
return NULL;
return elf_nios2_r1_howto_table_rel + i;
}
}
/* Map for converting BFD reloc types to Nios II reloc types. */
struct elf_reloc_map
{
bfd_reloc_code_real_type bfd_val;
enum elf_nios2_reloc_type elf_val;
};
static const struct elf_reloc_map nios2_reloc_map[] =
{
{BFD_RELOC_NONE, R_NIOS2_NONE},
{BFD_RELOC_NIOS2_S16, R_NIOS2_S16},
{BFD_RELOC_NIOS2_U16, R_NIOS2_U16},
{BFD_RELOC_16_PCREL, R_NIOS2_PCREL16},
{BFD_RELOC_NIOS2_CALL26, R_NIOS2_CALL26},
{BFD_RELOC_NIOS2_IMM5, R_NIOS2_IMM5},
{BFD_RELOC_NIOS2_CACHE_OPX, R_NIOS2_CACHE_OPX},
{BFD_RELOC_NIOS2_IMM6, R_NIOS2_IMM6},
{BFD_RELOC_NIOS2_IMM8, R_NIOS2_IMM8},
{BFD_RELOC_NIOS2_HI16, R_NIOS2_HI16},
{BFD_RELOC_NIOS2_LO16, R_NIOS2_LO16},
{BFD_RELOC_NIOS2_HIADJ16, R_NIOS2_HIADJ16},
{BFD_RELOC_32, R_NIOS2_BFD_RELOC_32},
{BFD_RELOC_16, R_NIOS2_BFD_RELOC_16},
{BFD_RELOC_8, R_NIOS2_BFD_RELOC_8},
{BFD_RELOC_NIOS2_GPREL, R_NIOS2_GPREL},
{BFD_RELOC_VTABLE_INHERIT, R_NIOS2_GNU_VTINHERIT},
{BFD_RELOC_VTABLE_ENTRY, R_NIOS2_GNU_VTENTRY},
{BFD_RELOC_NIOS2_UJMP, R_NIOS2_UJMP},
{BFD_RELOC_NIOS2_CJMP, R_NIOS2_CJMP},
{BFD_RELOC_NIOS2_CALLR, R_NIOS2_CALLR},
{BFD_RELOC_NIOS2_ALIGN, R_NIOS2_ALIGN},
{BFD_RELOC_NIOS2_GOT16, R_NIOS2_GOT16},
{BFD_RELOC_NIOS2_CALL16, R_NIOS2_CALL16},
{BFD_RELOC_NIOS2_GOTOFF_LO, R_NIOS2_GOTOFF_LO},
{BFD_RELOC_NIOS2_GOTOFF_HA, R_NIOS2_GOTOFF_HA},
{BFD_RELOC_NIOS2_PCREL_LO, R_NIOS2_PCREL_LO},
{BFD_RELOC_NIOS2_PCREL_HA, R_NIOS2_PCREL_HA},
{BFD_RELOC_NIOS2_TLS_GD16, R_NIOS2_TLS_GD16},
{BFD_RELOC_NIOS2_TLS_LDM16, R_NIOS2_TLS_LDM16},
{BFD_RELOC_NIOS2_TLS_LDO16, R_NIOS2_TLS_LDO16},
{BFD_RELOC_NIOS2_TLS_IE16, R_NIOS2_TLS_IE16},
{BFD_RELOC_NIOS2_TLS_LE16, R_NIOS2_TLS_LE16},
{BFD_RELOC_NIOS2_TLS_DTPMOD, R_NIOS2_TLS_DTPMOD},
{BFD_RELOC_NIOS2_TLS_DTPREL, R_NIOS2_TLS_DTPREL},
{BFD_RELOC_NIOS2_TLS_TPREL, R_NIOS2_TLS_TPREL},
{BFD_RELOC_NIOS2_COPY, R_NIOS2_COPY},
{BFD_RELOC_NIOS2_GLOB_DAT, R_NIOS2_GLOB_DAT},
{BFD_RELOC_NIOS2_JUMP_SLOT, R_NIOS2_JUMP_SLOT},
{BFD_RELOC_NIOS2_RELATIVE, R_NIOS2_RELATIVE},
{BFD_RELOC_NIOS2_GOTOFF, R_NIOS2_GOTOFF},
{BFD_RELOC_NIOS2_CALL26_NOAT, R_NIOS2_CALL26_NOAT},
{BFD_RELOC_NIOS2_GOT_LO, R_NIOS2_GOT_LO},
{BFD_RELOC_NIOS2_GOT_HA, R_NIOS2_GOT_HA},
{BFD_RELOC_NIOS2_CALL_LO, R_NIOS2_CALL_LO},
{BFD_RELOC_NIOS2_CALL_HA, R_NIOS2_CALL_HA},
{BFD_RELOC_NIOS2_R2_S12, R_NIOS2_R2_S12},
{BFD_RELOC_NIOS2_R2_I10_1_PCREL, R_NIOS2_R2_I10_1_PCREL},
{BFD_RELOC_NIOS2_R2_T1I7_1_PCREL, R_NIOS2_R2_T1I7_1_PCREL},
{BFD_RELOC_NIOS2_R2_T1I7_2, R_NIOS2_R2_T1I7_2},
{BFD_RELOC_NIOS2_R2_T2I4, R_NIOS2_R2_T2I4},
{BFD_RELOC_NIOS2_R2_T2I4_1, R_NIOS2_R2_T2I4_1},
{BFD_RELOC_NIOS2_R2_T2I4_2, R_NIOS2_R2_T2I4_2},
{BFD_RELOC_NIOS2_R2_X1I7_2, R_NIOS2_R2_X1I7_2},
{BFD_RELOC_NIOS2_R2_X2L5, R_NIOS2_R2_X2L5},
{BFD_RELOC_NIOS2_R2_F1I5_2, R_NIOS2_R2_F1I5_2},
{BFD_RELOC_NIOS2_R2_L5I4X1, R_NIOS2_R2_L5I4X1},
{BFD_RELOC_NIOS2_R2_T1X1I6, R_NIOS2_R2_T1X1I6},
{BFD_RELOC_NIOS2_R2_T1X1I6_2, R_NIOS2_R2_T1X1I6_2},
};
enum elf32_nios2_stub_type
{
nios2_stub_call26_before,
nios2_stub_call26_after,
nios2_stub_none
};
struct elf32_nios2_stub_hash_entry
{
/* Base hash table entry structure. */
struct bfd_hash_entry bh_root;
/* The stub section. */
asection *stub_sec;
/* Offset within stub_sec of the beginning of this stub. */
bfd_vma stub_offset;
/* Given the symbol's value and its section we can determine its final
value when building the stubs (so the stub knows where to jump. */
bfd_vma target_value;
asection *target_section;
enum elf32_nios2_stub_type stub_type;
/* The symbol table entry, if any, that this was derived from. */
struct elf32_nios2_link_hash_entry *hh;
/* And the reloc addend that this was derived from. */
bfd_vma addend;
/* Where this stub is being called from, or, in the case of combined
stub sections, the first input section in the group. */
asection *id_sec;
};
#define nios2_stub_hash_entry(ent) \
((struct elf32_nios2_stub_hash_entry *)(ent))
#define nios2_stub_hash_lookup(table, string, create, copy) \
((struct elf32_nios2_stub_hash_entry *) \
bfd_hash_lookup ((table), (string), (create), (copy)))
/* Nios II ELF linker hash entry. */
struct elf32_nios2_link_hash_entry
{
struct elf_link_hash_entry root;
/* A pointer to the most recently used stub hash entry against this
symbol. */
struct elf32_nios2_stub_hash_entry *hsh_cache;
#define GOT_UNKNOWN 0
#define GOT_NORMAL 1
#define GOT_TLS_GD 2
#define GOT_TLS_IE 4
unsigned char tls_type;
/* We need to detect and take special action for symbols which are only
referenced with %call() and not with %got(). Such symbols do not need
a dynamic GOT reloc in shared objects, only a dynamic PLT reloc. Lazy
linking will not work if the dynamic GOT reloc exists.
To check for this condition efficiently, we compare got_types_used against
CALL_USED, meaning
(got_types_used & (GOT_USED | CALL_USED)) == CALL_USED.
*/
#define GOT_USED 1
#define CALL_USED 2
unsigned char got_types_used;
};
#define elf32_nios2_hash_entry(ent) \
((struct elf32_nios2_link_hash_entry *) (ent))
/* Get the Nios II elf linker hash table from a link_info structure. */
#define elf32_nios2_hash_table(info) \
((struct elf32_nios2_link_hash_table *) ((info)->hash))
/* Nios II ELF linker hash table. */
struct elf32_nios2_link_hash_table
{
/* The main hash table. */
struct elf_link_hash_table root;
/* The stub hash table. */
struct bfd_hash_table bstab;
/* Linker stub bfd. */
bfd *stub_bfd;
/* Linker call-backs. */
asection * (*add_stub_section) (const char *, asection *, bool);
void (*layout_sections_again) (void);
/* Array to keep track of which stub sections have been created, and
information on stub grouping. */
struct map_stub
{
/* These are the section to which stubs in the group will be
attached. */
asection *first_sec, *last_sec;
/* The stub sections. There might be stubs inserted either before
or after the real section.*/
asection *first_stub_sec, *last_stub_sec;
} *stub_group;
/* Assorted information used by nios2_elf32_size_stubs. */
unsigned int bfd_count;
unsigned int top_index;
asection **input_list;
Elf_Internal_Sym **all_local_syms;
/* Short-cuts to get to dynamic linker sections. */
asection *sbss;
/* GOT pointer symbol _gp_got. */
struct elf_link_hash_entry *h_gp_got;
union {
bfd_signed_vma refcount;
bfd_vma offset;
} tls_ldm_got;
bfd_vma res_n_size;
};
struct nios2_elf32_obj_tdata
{
struct elf_obj_tdata root;
/* tls_type for each local got entry. */
char *local_got_tls_type;
/* TRUE if TLS GD relocs have been seen for this object. */
bool has_tlsgd;
};
#define elf32_nios2_tdata(abfd) \
((struct nios2_elf32_obj_tdata *) (abfd)->tdata.any)
#define elf32_nios2_local_got_tls_type(abfd) \
(elf32_nios2_tdata (abfd)->local_got_tls_type)
/* The name of the dynamic interpreter. This is put in the .interp
section. */
#define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1"
/* PLT implementation for position-dependent code. */
static const bfd_vma nios2_plt_entry[] = { /* .PLTn: */
0x03c00034, /* movhi r15, %hiadj(plt_got_slot_address) */
0x7bc00017, /* ldw r15, %lo(plt_got_slot_address)(r15) */
0x7800683a /* jmp r15 */
};
static const bfd_vma nios2_plt0_entry[] = { /* .PLTresolve */
0x03800034, /* movhi r14, %hiadj(res_0) */
0x73800004, /* addi r14, r14, %lo(res_0) */
0x7b9fc83a, /* sub r15, r15, r14 */
0x03400034, /* movhi r13, %hiadj(_GLOBAL_OFFSET_TABLE_) */
0x6b800017, /* ldw r14, %lo(_GLOBAL_OFFSET_TABLE_+4)(r13) */
0x6b400017, /* ldw r13, %lo(_GLOBAL_OFFSET_TABLE_+8)(r13) */
0x6800683a /* jmp r13 */
};
/* PLT implementation for position-independent code. */
static const bfd_vma nios2_so_plt_entry[] = { /* .PLTn */
0x03c00034, /* movhi r15, %hiadj(index * 4) */
0x7bc00004, /* addi r15, r15, %lo(index * 4) */
0x00000006 /* br .PLTresolve */
};
static const bfd_vma nios2_so_plt0_entry[] = { /* .PLTresolve */
0x001ce03a, /* nextpc r14 */
0x03400034, /* movhi r13, %hiadj(_GLOBAL_OFFSET_TABLE_) */
0x6b9b883a, /* add r13, r13, r14 */
0x6b800017, /* ldw r14, %lo(_GLOBAL_OFFSET_TABLE_+4)(r13) */
0x6b400017, /* ldw r13, %lo(_GLOBAL_OFFSET_TABLE_+8)(r13) */
0x6800683a /* jmp r13 */
};
/* CALL26 stub. */
static const bfd_vma nios2_call26_stub_entry[] = {
0x00400034, /* orhi at, r0, %hiadj(dest) */
0x08400004, /* addi at, at, %lo(dest) */
0x0800683a /* jmp at */
};
/* Install 16-bit immediate value VALUE at offset OFFSET into section SEC. */
static void
nios2_elf32_install_imm16 (asection *sec, bfd_vma offset, bfd_vma value)
{
bfd_vma word = bfd_get_32 (sec->owner, sec->contents + offset);
bfd_put_32 (sec->owner, word | ((value & 0xffff) << 6),
sec->contents + offset);
}
/* Install COUNT 32-bit values DATA starting at offset OFFSET into
section SEC. */
static void
nios2_elf32_install_data (asection *sec, const bfd_vma *data, bfd_vma offset,
int count)
{
while (count--)
{
bfd_put_32 (sec->owner, *data, sec->contents + offset);
offset += 4;
++data;
}
}
/* The usual way of loading a 32-bit constant into a Nios II register is to
load the high 16 bits in one instruction and then add the low 16 bits with
a signed add. This means that the high halfword needs to be adjusted to
compensate for the sign bit of the low halfword. This function returns the
adjusted high halfword for a given 32-bit constant. */
static
bfd_vma hiadj (bfd_vma symbol_value)
{
return ((symbol_value + 0x8000) >> 16) & 0xffff;
}
/* Implement elf_backend_grok_prstatus:
Support for core dump NOTE sections. */
static bool
nios2_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
{
int offset;
size_t size;
switch (note->descsz)
{
default:
return false;
case 212: /* Linux/Nios II */
/* pr_cursig */
elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
/* pr_pid */
elf_tdata (abfd)->core->pid = bfd_get_32 (abfd, note->descdata + 24);
/* pr_reg */
offset = 72;
size = 136;
break;
}
/* Make a ".reg/999" section. */
return _bfd_elfcore_make_pseudosection (abfd, ".reg",
size, note->descpos + offset);
}
/* Implement elf_backend_grok_psinfo. */
static bool
nios2_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
{
switch (note->descsz)
{
default:
return false;
case 124: /* Linux/Nios II elf_prpsinfo */
elf_tdata (abfd)->core->program
= _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
elf_tdata (abfd)->core->command
= _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
}
/* Note that for some reason, a spurious space is tacked
onto the end of the args in some (at least one anyway)
implementations, so strip it off if it exists. */
{
char *command = elf_tdata (abfd)->core->command;
int n = strlen (command);
if (0 < n && command[n - 1] == ' ')
command[n - 1] = '\0';
}
return true;
}
/* Assorted hash table functions. */
/* Initialize an entry in the stub hash table. */
static struct bfd_hash_entry *
stub_hash_newfunc (struct bfd_hash_entry *entry,
struct bfd_hash_table *table,
const char *string)
{
/* Allocate the structure if it has not already been allocated by a
subclass. */
if (entry == NULL)
{
entry = bfd_hash_allocate (table,
sizeof (struct elf32_nios2_stub_hash_entry));
if (entry == NULL)
return entry;
}
/* Call the allocation method of the superclass. */
entry = bfd_hash_newfunc (entry, table, string);
if (entry != NULL)
{
struct elf32_nios2_stub_hash_entry *hsh;
/* Initialize the local fields. */
hsh = (struct elf32_nios2_stub_hash_entry *) entry;
hsh->stub_sec = NULL;
hsh->stub_offset = 0;
hsh->target_value = 0;
hsh->target_section = NULL;
hsh->stub_type = nios2_stub_none;
hsh->hh = NULL;
hsh->id_sec = NULL;
}
return entry;
}
/* Create an entry in a Nios II ELF linker hash table. */
static struct bfd_hash_entry *
link_hash_newfunc (struct bfd_hash_entry *entry,
struct bfd_hash_table *table, const char *string)
{
/* Allocate the structure if it has not already been allocated by a
subclass. */
if (entry == NULL)
{
entry = bfd_hash_allocate (table,
sizeof (struct elf32_nios2_link_hash_entry));
if (entry == NULL)
return entry;
}
/* Call the allocation method of the superclass. */
entry = _bfd_elf_link_hash_newfunc (entry, table, string);
if (entry)
{
struct elf32_nios2_link_hash_entry *eh;
eh = (struct elf32_nios2_link_hash_entry *) entry;
eh->hsh_cache = NULL;
eh->tls_type = GOT_UNKNOWN;
eh->got_types_used = 0;
}
return entry;
}
/* Section name for stubs is the associated section name plus this
string. */
#define STUB_SUFFIX ".stub"
/* Build a name for an entry in the stub hash table. */
static char *
nios2_stub_name (const asection *input_section,
const asection *sym_sec,
const struct elf32_nios2_link_hash_entry *hh,
const Elf_Internal_Rela *rel,
enum elf32_nios2_stub_type stub_type)
{
char *stub_name;
bfd_size_type len;
char stubpos = (stub_type == nios2_stub_call26_before) ? 'b' : 'a';
if (hh)
{
len = 8 + 1 + 1 + 1+ strlen (hh->root.root.root.string) + 1 + 8 + 1;
stub_name = bfd_malloc (len);
if (stub_name != NULL)
{
sprintf (stub_name, "%08x_%c_%s+%x",
input_section->id & 0xffffffff,
stubpos,
hh->root.root.root.string,
(int) rel->r_addend & 0xffffffff);
}
}
else
{
len = 8 + 1 + 1 + 1+ 8 + 1 + 8 + 1 + 8 + 1;
stub_name = bfd_malloc (len);
if (stub_name != NULL)
{
sprintf (stub_name, "%08x_%c_%x:%x+%x",
input_section->id & 0xffffffff,
stubpos,
sym_sec->id & 0xffffffff,
(int) ELF32_R_SYM (rel->r_info) & 0xffffffff,
(int) rel->r_addend & 0xffffffff);
}
}
return stub_name;
}
/* Look up an entry in the stub hash. Stub entries are cached because
creating the stub name takes a bit of time. */
static struct elf32_nios2_stub_hash_entry *
nios2_get_stub_entry (const asection *input_section,
const asection *sym_sec,
struct elf32_nios2_link_hash_entry *hh,
const Elf_Internal_Rela *rel,
struct elf32_nios2_link_hash_table *htab,
enum elf32_nios2_stub_type stub_type)
{
struct elf32_nios2_stub_hash_entry *hsh;
const asection *id_sec;
/* If this input section is part of a group of sections sharing one
stub section, then use the id of the first/last section in the group,
depending on the stub section placement relative to the group.
Stub names need to include a section id, as there may well be
more than one stub used to reach say, printf, and we need to
distinguish between them. */
if (stub_type == nios2_stub_call26_before)
id_sec = htab->stub_group[input_section->id].first_sec;
else
id_sec = htab->stub_group[input_section->id].last_sec;
if (hh != NULL && hh->hsh_cache != NULL
&& hh->hsh_cache->hh == hh
&& hh->hsh_cache->id_sec == id_sec
&& hh->hsh_cache->stub_type == stub_type)
{
hsh = hh->hsh_cache;
}
else
{
char *stub_name;
stub_name = nios2_stub_name (id_sec, sym_sec, hh, rel, stub_type);
if (stub_name == NULL)
return NULL;
hsh = nios2_stub_hash_lookup (&htab->bstab,
stub_name, false, false);
if (hh != NULL)
hh->hsh_cache = hsh;
free (stub_name);
}
return hsh;
}
/* Add a new stub entry to the stub hash. Not all fields of the new
stub entry are initialised. */
static struct elf32_nios2_stub_hash_entry *
nios2_add_stub (const char *stub_name,
asection *section,
struct elf32_nios2_link_hash_table *htab,
enum elf32_nios2_stub_type stub_type)
{
asection *link_sec;
asection *stub_sec;
asection **secptr, **linkptr;
struct elf32_nios2_stub_hash_entry *hsh;
bool afterp;
if (stub_type == nios2_stub_call26_before)
{
link_sec = htab->stub_group[section->id].first_sec;
secptr = &(htab->stub_group[section->id].first_stub_sec);
linkptr = &(htab->stub_group[link_sec->id].first_stub_sec);
afterp = false;
}
else
{
link_sec = htab->stub_group[section->id].last_sec;
secptr = &(htab->stub_group[section->id].last_stub_sec);
linkptr = &(htab->stub_group[link_sec->id].last_stub_sec);
afterp = true;
}
stub_sec = *secptr;
if (stub_sec == NULL)
{
stub_sec = *linkptr;
if (stub_sec == NULL)
{
size_t namelen;
bfd_size_type len;
char *s_name;
namelen = strlen (link_sec->name);
len = namelen + sizeof (STUB_SUFFIX);
s_name = bfd_alloc (htab->stub_bfd, len);
if (s_name == NULL)
return NULL;
memcpy (s_name, link_sec->name, namelen);
memcpy (s_name + namelen, STUB_SUFFIX, sizeof (STUB_SUFFIX));
stub_sec = (*htab->add_stub_section) (s_name, link_sec, afterp);
if (stub_sec == NULL)
return NULL;
*linkptr = stub_sec;
}
*secptr = stub_sec;
}
/* Enter this entry into the linker stub hash table. */
hsh = nios2_stub_hash_lookup (&htab->bstab, stub_name,
true, false);
if (hsh == NULL)
{
/* xgettext:c-format */
_bfd_error_handler (_("%pB: cannot create stub entry %s"),
section->owner,
stub_name);
return NULL;
}
hsh->stub_sec = stub_sec;
hsh->stub_offset = 0;
hsh->id_sec = link_sec;
return hsh;
}
/* Set up various things so that we can make a list of input sections
for each output section included in the link. Returns -1 on error,
0 when no stubs will be needed, and 1 on success. */
int
nios2_elf32_setup_section_lists (bfd *output_bfd, struct bfd_link_info *info)
{
bfd *input_bfd;
unsigned int bfd_count;
unsigned int top_id, top_index;
asection *section;
asection **input_list, **list;
size_t amt;
struct elf32_nios2_link_hash_table *htab = elf32_nios2_hash_table (info);
/* Count the number of input BFDs and find the top input section id. */
for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0;
input_bfd != NULL;
input_bfd = input_bfd->link.next)
{
bfd_count += 1;
for (section = input_bfd->sections;
section != NULL;
section = section->next)
{
if (top_id < section->id)
top_id = section->id;
}
}
htab->bfd_count = bfd_count;
amt = sizeof (struct map_stub) * (top_id + 1);
htab->stub_group = bfd_zmalloc (amt);
if (htab->stub_group == NULL)
return -1;
/* We can't use output_bfd->section_count here to find the top output
section index as some sections may have been removed, and
strip_excluded_output_sections doesn't renumber the indices. */
for (section = output_bfd->sections, top_index = 0;
section != NULL;
section = section->next)
{
if (top_index < section->index)
top_index = section->index;
}
htab->top_index = top_index;
amt = sizeof (asection *) * (top_index + 1);
input_list = bfd_malloc (amt);
htab->input_list = input_list;
if (input_list == NULL)
return -1;
/* For sections we aren't interested in, mark their entries with a
value we can check later. */
list = input_list + top_index;
do
*list = bfd_abs_section_ptr;
while (list-- != input_list);
for (section = output_bfd->sections;
section != NULL;
section = section->next)
{
/* FIXME: This is a bit of hack. Currently our .ctors and .dtors
* have PC relative relocs in them but no code flag set. */
if (((section->flags & SEC_CODE) != 0) ||
strcmp(".ctors", section->name) ||
strcmp(".dtors", section->name))
input_list[section->index] = NULL;
}
return 1;
}
/* The linker repeatedly calls this function for each input section,
in the order that input sections are linked into output sections.
Build lists of input sections to determine groupings between which
we may insert linker stubs. */
void
nios2_elf32_next_input_section (struct bfd_link_info *info, asection *isec)
{
struct elf32_nios2_link_hash_table *htab = elf32_nios2_hash_table (info);
if (isec->output_section->index <= htab->top_index)
{
asection **list = htab->input_list + isec->output_section->index;
if (*list != bfd_abs_section_ptr)
{
/* Steal the last_sec pointer for our list.
This happens to make the list in reverse order,
which is what we want. */
htab->stub_group[isec->id].last_sec = *list;
*list = isec;
}
}
}
/* Segment mask for CALL26 relocation relaxation. */
#define CALL26_SEGMENT(x) ((x) & 0xf0000000)
/* Fudge factor for approximate maximum size of all stubs that might
be inserted by the linker. This does not actually limit the number
of stubs that might be inserted, and only affects strategy for grouping
and placement of stubs. Perhaps this should be computed based on number
of relocations seen, or be specifiable on the command line. */
#define MAX_STUB_SECTION_SIZE 0xffff
/* See whether we can group stub sections together. Grouping stub
sections may result in fewer stubs. More importantly, we need to
put all .init* and .fini* stubs at the end of the .init or
.fini output sections respectively, because glibc splits the
_init and _fini functions into multiple parts. Putting a stub in
the middle of a function is not a good idea.
Rather than computing groups of a maximum fixed size, for Nios II
CALL26 relaxation it makes more sense to compute the groups based on
sections that fit within a 256MB address segment. Also do not allow
a group to span more than one output section, since different output
sections might correspond to different memory banks on a bare-metal
target, etc. */
static void
group_sections (struct elf32_nios2_link_hash_table *htab)
{
asection **list = htab->input_list + htab->top_index;
do
{
/* The list is in reverse order so we'll search backwards looking
for the first section that begins in the same memory segment,
marking sections along the way to point at the tail for this
group. */
asection *tail = *list;
if (tail == bfd_abs_section_ptr)
continue;
while (tail != NULL)
{
bfd_vma start = tail->output_section->vma + tail->output_offset;
bfd_vma end = start + tail->size;
bfd_vma segment = CALL26_SEGMENT (end);
asection *prev;
if (segment != CALL26_SEGMENT (start)
|| segment != CALL26_SEGMENT (end + MAX_STUB_SECTION_SIZE))
/* This section spans more than one memory segment, or is
close enough to the end of the segment that adding stub
sections before it might cause it to move so that it
spans memory segments, or that stubs added at the end of
this group might overflow into the next memory segment.
Put it in a group by itself to localize the effects. */
{
prev = htab->stub_group[tail->id].last_sec;
htab->stub_group[tail->id].last_sec = tail;
htab->stub_group[tail->id].first_sec = tail;
}
else
/* Collect more sections for this group. */
{
asection *curr, *first;
for (curr = tail; ; curr = prev)
{
prev = htab->stub_group[curr->id].last_sec;
if (!prev
|| tail->output_section != prev->output_section
|| (CALL26_SEGMENT (prev->output_section->vma
+ prev->output_offset)
!= segment))
break;
}
first = curr;
for (curr = tail; ; curr = prev)
{
prev = htab->stub_group[curr->id].last_sec;
htab->stub_group[curr->id].last_sec = tail;
htab->stub_group[curr->id].first_sec = first;
if (curr == first)
break;
}
}
/* Reset tail for the next group. */
tail = prev;
}
}
while (list-- != htab->input_list);
free (htab->input_list);
}
/* Determine the type of stub needed, if any, for a call. */
static enum elf32_nios2_stub_type
nios2_type_of_stub (asection *input_sec,
const Elf_Internal_Rela *rel,
struct elf32_nios2_link_hash_entry *hh,
struct elf32_nios2_link_hash_table *htab,
bfd_vma destination,
struct bfd_link_info *info ATTRIBUTE_UNUSED)
{
bfd_vma location, segment, start, end;
asection *s0, *s1, *s;
if (hh != NULL &&
!(hh->root.root.type == bfd_link_hash_defined
|| hh->root.root.type == bfd_link_hash_defweak))
return nios2_stub_none;
/* Determine where the call point is. */
location = (input_sec->output_section->vma
+ input_sec->output_offset + rel->r_offset);
segment = CALL26_SEGMENT (location);
/* Nios II CALL and JMPI instructions can transfer control to addresses
within the same 256MB segment as the PC. */
if (segment == CALL26_SEGMENT (destination))
return nios2_stub_none;
/* Find the start and end addresses of the stub group. Also account for
any already-created stub sections for this group. Note that for stubs
in the end section, only the first instruction of the last stub
(12 bytes long) needs to be within range. */
s0 = htab->stub_group[input_sec->id].first_sec;
s = htab->stub_group[s0->id].first_stub_sec;
if (s != NULL && s->size > 0)
start = s->output_section->vma + s->output_offset;
else
start = s0->output_section->vma + s0->output_offset;
s1 = htab->stub_group[input_sec->id].last_sec;
s = htab->stub_group[s1->id].last_stub_sec;
if (s != NULL && s->size > 0)
end = s->output_section->vma + s->output_offset + s->size - 8;
else
end = s1->output_section->vma + s1->output_offset + s1->size;
BFD_ASSERT (start < end);
BFD_ASSERT (start <= location);
BFD_ASSERT (location < end);
/* Put stubs at the end of the group unless that is not a valid
location and the beginning of the group is. It might be that
neither the beginning nor end works if we have an input section
so large that it spans multiple segment boundaries. In that
case, punt; the end result will be a relocation overflow error no
matter what we do here.
Note that adding stubs pushes up the addresses of all subsequent
sections, so that stubs allocated on one pass through the
relaxation loop may not be valid on the next pass. (E.g., we may
allocate a stub at the beginning of the section on one pass and
find that the call site has been bumped into the next memory
segment on the next pass.) The important thing to note is that
we never try to reclaim the space allocated to such unused stubs,
so code size and section addresses can only increase with each
iteration. Accounting for the start and end addresses of the
already-created stub sections ensures that when the algorithm
converges, it converges accurately, with the entire appropriate
stub section accessible from the call site and not just the
address at the start or end of the stub group proper. */
if (segment == CALL26_SEGMENT (end))
return nios2_stub_call26_after;
else if (segment == CALL26_SEGMENT (start))
return nios2_stub_call26_before;
else
/* Perhaps this should be a dedicated error code. */
return nios2_stub_none;
}
static bool
nios2_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg ATTRIBUTE_UNUSED)
{
struct elf32_nios2_stub_hash_entry *hsh
= (struct elf32_nios2_stub_hash_entry *) gen_entry;
asection *stub_sec = hsh->stub_sec;
bfd_vma sym_value;
struct bfd_link_info *info;
info = (struct bfd_link_info *) in_arg;
/* Fail if the target section could not be assigned to an output
section. The user should fix his linker script. */
if (hsh->target_section->output_section == NULL
&& info->non_contiguous_regions)
info->callbacks->einfo (_("%F%P: Could not assign `%pA' to an output section. "
"Retry without --enable-non-contiguous-regions.\n"),
hsh->target_section);
/* Make a note of the offset within the stubs for this entry. */
hsh->stub_offset = stub_sec->size;
switch (hsh->stub_type)
{
case nios2_stub_call26_before:
case nios2_stub_call26_after:
/* A call26 stub looks like:
orhi at, %hiadj(dest)
addi at, at, %lo(dest)
jmp at
Note that call/jmpi instructions can't be used in PIC code
so there is no reason for the stub to be PIC, either. */
sym_value = (hsh->target_value
+ hsh->target_section->output_offset
+ hsh->target_section->output_section->vma
+ hsh->addend);
nios2_elf32_install_data (stub_sec, nios2_call26_stub_entry,
hsh->stub_offset, 3);
nios2_elf32_install_imm16 (stub_sec, hsh->stub_offset,
hiadj (sym_value));
nios2_elf32_install_imm16 (stub_sec, hsh->stub_offset + 4,
sym_value);
stub_sec->size += 12;
break;
default:
BFD_FAIL ();
return false;
}
return true;
}
/* As above, but don't actually build the stub. Just bump offset so
we know stub section sizes. */
static bool
nios2_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg ATTRIBUTE_UNUSED)
{
struct elf32_nios2_stub_hash_entry *hsh
= (struct elf32_nios2_stub_hash_entry *) gen_entry;
switch (hsh->stub_type)
{
case nios2_stub_call26_before:
case nios2_stub_call26_after:
hsh->stub_sec->size += 12;
break;
default:
BFD_FAIL ();
return false;
}
return true;
}
/* Read in all local syms for all input bfds.
Returns -1 on error, 0 otherwise. */
static int
get_local_syms (bfd *output_bfd ATTRIBUTE_UNUSED, bfd *input_bfd,
struct bfd_link_info *info)
{
unsigned int bfd_indx;
Elf_Internal_Sym *local_syms, **all_local_syms;
struct elf32_nios2_link_hash_table *htab = elf32_nios2_hash_table (info);
/* We want to read in symbol extension records only once. To do this
we need to read in the local symbols in parallel and save them for
later use; so hold pointers to the local symbols in an array. */
size_t amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count;
all_local_syms = bfd_zmalloc (amt);
htab->all_local_syms = all_local_syms;
if (all_local_syms == NULL)
return -1;
/* Walk over all the input BFDs, swapping in local symbols. */
for (bfd_indx = 0;
input_bfd != NULL;
input_bfd = input_bfd->link.next, bfd_indx++)
{
Elf_Internal_Shdr *symtab_hdr;
/* We'll need the symbol table in a second. */
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
if (symtab_hdr->sh_info == 0)
continue;
/* We need an array of the local symbols attached to the input bfd. */
local_syms = (Elf_Internal_Sym *) symtab_hdr->contents;
if (local_syms == NULL)
{
local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
symtab_hdr->sh_info, 0,
NULL, NULL, NULL);
/* Cache them for elf_link_input_bfd. */
symtab_hdr->contents = (unsigned char *) local_syms;
}
if (local_syms == NULL)
return -1;
all_local_syms[bfd_indx] = local_syms;
}
return 0;
}
/* Determine and set the size of the stub section for a final link. */
bool
nios2_elf32_size_stubs (bfd *output_bfd, bfd *stub_bfd,
struct bfd_link_info *info,
asection *(*add_stub_section) (const char *,
asection *, bool),
void (*layout_sections_again) (void))
{
bool stub_changed = false;
struct elf32_nios2_link_hash_table *htab = elf32_nios2_hash_table (info);
/* Stash our params away. */
htab->stub_bfd = stub_bfd;
htab->add_stub_section = add_stub_section;
htab->layout_sections_again = layout_sections_again;
/* FIXME: We only compute the section groups once. This could cause
problems if adding a large stub section causes following sections,
or parts of them, to move into another segment. However, this seems
to be consistent with the way other back ends handle this.... */
group_sections (htab);
if (get_local_syms (output_bfd, info->input_bfds, info))
{
if (htab->all_local_syms)
goto error_ret_free_local;
return false;
}
while (1)
{
bfd *input_bfd;
unsigned int bfd_indx;
asection *stub_sec;
for (input_bfd = info->input_bfds, bfd_indx = 0;
input_bfd != NULL;
input_bfd = input_bfd->link.next, bfd_indx++)
{
Elf_Internal_Shdr *symtab_hdr;
asection *section;
Elf_Internal_Sym *local_syms;
/* We'll need the symbol table in a second. */
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
if (symtab_hdr->sh_info == 0)
continue;
local_syms = htab->all_local_syms[bfd_indx];
/* Walk over each section attached to the input bfd. */
for (section = input_bfd->sections;
section != NULL;
section = section->next)
{
Elf_Internal_Rela *internal_relocs, *irelaend, *irela;
/* If there aren't any relocs, then there's nothing more
to do. */
if ((section->flags & SEC_RELOC) == 0
|| section->reloc_count == 0)
continue;
/* If this section is a link-once section that will be
discarded, then don't create any stubs. */
if (section->output_section == NULL
|| section->output_section->owner != output_bfd)
continue;
/* Get the relocs. */
internal_relocs
= _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL,
info->keep_memory);
if (internal_relocs == NULL)
goto error_ret_free_local;
/* Now examine each relocation. */
irela = internal_relocs;
irelaend = irela + section->reloc_count;
for (; irela < irelaend; irela++)
{
unsigned int r_type, r_indx;
enum elf32_nios2_stub_type stub_type;
struct elf32_nios2_stub_hash_entry *hsh;
asection *sym_sec;
bfd_vma sym_value;
bfd_vma destination;
struct elf32_nios2_link_hash_entry *hh;
char *stub_name;
const asection *id_sec;
r_type = ELF32_R_TYPE (irela->r_info);
r_indx = ELF32_R_SYM (irela->r_info);
if (r_type >= (unsigned int) R_NIOS2_ILLEGAL)
{
bfd_set_error (bfd_error_bad_value);
error_ret_free_internal:
if (elf_section_data (section)->relocs == NULL)
free (internal_relocs);
goto error_ret_free_local;
}
/* Only look for stubs on CALL and JMPI instructions. */
if (r_type != (unsigned int) R_NIOS2_CALL26)
continue;
/* Now determine the call target, its name, value,
section. */
sym_sec = NULL;
sym_value = 0;
destination = 0;
hh = NULL;
if (r_indx < symtab_hdr->sh_info)
{
/* It's a local symbol. */
Elf_Internal_Sym *sym;
Elf_Internal_Shdr *hdr;
unsigned int shndx;
sym = local_syms + r_indx;
if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
sym_value = sym->st_value;
shndx = sym->st_shndx;
if (shndx < elf_numsections (input_bfd))
{
hdr = elf_elfsections (input_bfd)[shndx];
sym_sec = hdr->bfd_section;
destination = (sym_value + irela->r_addend
+ sym_sec->output_offset
+ sym_sec->output_section->vma);
}
}
else
{
/* It's an external symbol. */
int e_indx;
e_indx = r_indx - symtab_hdr->sh_info;
hh = ((struct elf32_nios2_link_hash_entry *)
elf_sym_hashes (input_bfd)[e_indx]);
while (hh->root.root.type == bfd_link_hash_indirect
|| hh->root.root.type == bfd_link_hash_warning)
hh = ((struct elf32_nios2_link_hash_entry *)
hh->root.root.u.i.link);
if (hh->root.root.type == bfd_link_hash_defined
|| hh->root.root.type == bfd_link_hash_defweak)
{
sym_sec = hh->root.root.u.def.section;
sym_value = hh->root.root.u.def.value;
if (sym_sec->output_section != NULL)
destination = (sym_value + irela->r_addend
+ sym_sec->output_offset
+ sym_sec->output_section->vma);
else
continue;
}
else if (hh->root.root.type == bfd_link_hash_undefweak)
{
if (! bfd_link_pic (info))
continue;
}
else if (hh->root.root.type == bfd_link_hash_undefined)
{
if (! (info->unresolved_syms_in_objects == RM_IGNORE
&& (ELF_ST_VISIBILITY (hh->root.other)
== STV_DEFAULT)))
continue;
}
else
{
bfd_set_error (bfd_error_bad_value);
goto error_ret_free_internal;
}
}
/* Determine what (if any) linker stub is needed. */
stub_type = nios2_type_of_stub (section, irela, hh, htab,
destination, info);
if (stub_type == nios2_stub_none)
continue;
/* Support for grouping stub sections. */
if (stub_type == nios2_stub_call26_before)
id_sec = htab->stub_group[section->id].first_sec;
else
id_sec = htab->stub_group[section->id].last_sec;
/* Get the name of this stub. */
stub_name = nios2_stub_name (id_sec, sym_sec, hh, irela,
stub_type);
if (!stub_name)
goto error_ret_free_internal;
hsh = nios2_stub_hash_lookup (&htab->bstab,
stub_name,
false, false);
if (hsh != NULL)
{
/* The proper stub has already been created. */
free (stub_name);
continue;
}
hsh = nios2_add_stub (stub_name, section, htab, stub_type);
if (hsh == NULL)
{
free (stub_name);
goto error_ret_free_internal;
}
hsh->target_value = sym_value;
hsh->target_section = sym_sec;
hsh->stub_type = stub_type;
hsh->hh = hh;
hsh->addend = irela->r_addend;
stub_changed = true;
}
/* We're done with the internal relocs, free them. */
if (elf_section_data (section)->relocs == NULL)
free (internal_relocs);
}
}
if (!stub_changed)
break;
/* OK, we've added some stubs. Find out the new size of the
stub sections. */
for (stub_sec = htab->stub_bfd->sections;
stub_sec != NULL;
stub_sec = stub_sec->next)
stub_sec->size = 0;
bfd_hash_traverse (&htab->bstab, nios2_size_one_stub, htab);
/* Ask the linker to do its stuff. */
(*htab->layout_sections_again) ();
stub_changed = false;
}
free (htab->all_local_syms);
return true;
error_ret_free_local:
free (htab->all_local_syms);
return false;
}
/* Build all the stubs associated with the current output file. The
stubs are kept in a hash table attached to the main linker hash
table. This function is called via nios2elf_finish in the linker. */
bool
nios2_elf32_build_stubs (struct bfd_link_info *info)
{
asection *stub_sec;
struct bfd_hash_table *table;
struct elf32_nios2_link_hash_table *htab;
htab = elf32_nios2_hash_table (info);
for (stub_sec = htab->stub_bfd->sections;
stub_sec != NULL;
stub_sec = stub_sec->next)
/* The stub_bfd may contain non-stub sections if it is also the
dynobj. Any such non-stub sections are created with the
SEC_LINKER_CREATED flag set, while stub sections do not
have that flag. Ignore any non-stub sections here. */
if ((stub_sec->flags & SEC_LINKER_CREATED) == 0)
{
bfd_size_type size;
/* Allocate memory to hold the linker stubs. */
size = stub_sec->size;
stub_sec->contents = bfd_zalloc (htab->stub_bfd, size);
if (stub_sec->contents == NULL && size != 0)
return false;
stub_sec->size = 0;
}
/* Build the stubs as directed by the stub hash table. */
table = &htab->bstab;
bfd_hash_traverse (table, nios2_build_one_stub, info);
return true;
}
#define is_nios2_elf(bfd) \
(bfd_get_flavour (bfd) == bfd_target_elf_flavour \
&& elf_object_id (bfd) == NIOS2_ELF_DATA)
/* Merge backend specific data from an object file to the output
object file when linking. */
static bool
nios2_elf32_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
{
bfd *obfd = info->output_bfd;
flagword old_flags;
flagword new_flags;
if (!is_nios2_elf (ibfd) || !is_nios2_elf (obfd))
return true;
/* Check if we have the same endianness. */
if (! _bfd_generic_verify_endian_match (ibfd, info))
return false;
new_flags = elf_elfheader (ibfd)->e_flags;
old_flags = elf_elfheader (obfd)->e_flags;
if (!elf_flags_init (obfd))
{
/* First call, no flags set. */
elf_flags_init (obfd) = true;
elf_elfheader (obfd)->e_flags = new_flags;
switch (new_flags)
{
default:
case EF_NIOS2_ARCH_R1:
bfd_default_set_arch_mach (obfd, bfd_arch_nios2, bfd_mach_nios2r1);
break;
case EF_NIOS2_ARCH_R2:
if (bfd_big_endian (ibfd))
{
_bfd_error_handler
(_("error: %pB: big-endian R2 is not supported"), ibfd);
bfd_set_error (bfd_error_bad_value);
return false;
}
bfd_default_set_arch_mach (obfd, bfd_arch_nios2, bfd_mach_nios2r2);
break;
}
}
/* Incompatible flags. */
else if (new_flags != old_flags)
{
/* So far, the only incompatible flags denote incompatible
architectures. */
_bfd_error_handler
/* xgettext:c-format */
(_("error: %pB: conflicting CPU architectures %d/%d"),
ibfd, new_flags, old_flags);
bfd_set_error (bfd_error_bad_value);
return false;
}
/* Merge Tag_compatibility attributes and any common GNU ones. */
_bfd_elf_merge_object_attributes (ibfd, info);
return true;
}
/* Implement bfd_elf32_bfd_reloc_type_lookup:
Given a BFD reloc type, return a howto structure. */
static reloc_howto_type *
nios2_elf32_bfd_reloc_type_lookup (bfd *abfd,
bfd_reloc_code_real_type code)
{
int i;
for (i = 0; i < (int) ARRAY_SIZE (nios2_reloc_map); ++i)
if (nios2_reloc_map[i].bfd_val == code)
return lookup_howto (nios2_reloc_map[i].elf_val, abfd);
return NULL;
}
/* Implement bfd_elf32_bfd_reloc_name_lookup:
Given a reloc name, return a howto structure. */
static reloc_howto_type *
nios2_elf32_bfd_reloc_name_lookup (bfd *abfd,
const char *r_name)
{
int i;
reloc_howto_type *howto_tbl;
int howto_tbl_size;
if (BFD_IS_R2 (abfd))
{
howto_tbl = elf_nios2_r2_howto_table_rel;
howto_tbl_size = (int) ARRAY_SIZE (elf_nios2_r2_howto_table_rel);
}
else
{
howto_tbl = elf_nios2_r1_howto_table_rel;
howto_tbl_size = (int) ARRAY_SIZE (elf_nios2_r1_howto_table_rel);
}
for (i = 0; i < howto_tbl_size; i++)
if (howto_tbl[i].name && strcasecmp (howto_tbl[i].name, r_name) == 0)
return howto_tbl + i;
return NULL;
}
/* Implement elf_info_to_howto:
Given a ELF32 relocation, fill in a arelent structure. */
static bool
nios2_elf32_info_to_howto (bfd *abfd, arelent *cache_ptr,
Elf_Internal_Rela *dst)
{
unsigned int r_type;
r_type = ELF32_R_TYPE (dst->r_info);
if ((cache_ptr->howto = lookup_howto (r_type, abfd)) == NULL)
{
/* xgettext:c-format */
_bfd_error_handler (_("%pB: unsupported relocation type %#x"),
abfd, r_type);
bfd_set_error (bfd_error_bad_value);
return false;
}
return true;
}
/* Return the base VMA address which should be subtracted from real addresses
when resolving @dtpoff relocation.
This is PT_TLS segment p_vaddr. */
static bfd_vma
dtpoff_base (struct bfd_link_info *info)
{
/* If tls_sec is NULL, we should have signalled an error already. */
if (elf_hash_table (info)->tls_sec == NULL)
return 0;
return elf_hash_table (info)->tls_sec->vma;
}
/* Return the relocation value for @tpoff relocation
if STT_TLS virtual address is ADDRESS. */
static bfd_vma
tpoff (struct bfd_link_info *info, bfd_vma address)
{
struct elf_link_hash_table *htab = elf_hash_table (info);
/* If tls_sec is NULL, we should have signalled an error already. */
if (htab->tls_sec == NULL)
return 0;
return address - htab->tls_sec->vma;
}
/* Set the GP value for OUTPUT_BFD. Returns FALSE if this is a
dangerous relocation. */
static bool
nios2_elf_assign_gp (bfd *output_bfd, bfd_vma *pgp, struct bfd_link_info *info)
{
bool gp_found;
struct bfd_hash_entry *h;
struct bfd_link_hash_entry *lh;
/* If we've already figured out what GP will be, just return it. */
*pgp = _bfd_get_gp_value (output_bfd);
if (*pgp)
return true;
h = bfd_hash_lookup (&info->hash->table, "_gp", false, false);
lh = (struct bfd_link_hash_entry *) h;
lookup:
if (lh)
{
switch (lh->type)
{
case bfd_link_hash_undefined:
case bfd_link_hash_undefweak:
case bfd_link_hash_common:
gp_found = false;
break;
case bfd_link_hash_defined:
case bfd_link_hash_defweak:
gp_found = true;
{
asection *sym_sec = lh->u.def.section;
bfd_vma sym_value = lh->u.def.value;
if (sym_sec->output_section)
sym_value = (sym_value + sym_sec->output_offset
+ sym_sec->output_section->vma);
*pgp = sym_value;
}
break;
case bfd_link_hash_indirect:
case bfd_link_hash_warning:
lh = lh->u.i.link;
/* @@FIXME ignoring warning for now */
goto lookup;
case bfd_link_hash_new:
default:
abort ();
}
}
else
gp_found = false;
if (!gp_found)
{
/* Only get the error once. */
*pgp = 4;
_bfd_set_gp_value (output_bfd, *pgp);
return false;
}
_bfd_set_gp_value (output_bfd, *pgp);
return true;
}
/* Retrieve the previously cached _gp pointer, returning bfd_reloc_dangerous
if it's not available as we don't have a link_info pointer available here
to look it up in the output symbol table. We don't need to adjust the
symbol value for an external symbol if we are producing relocatable
output. */
static bfd_reloc_status_type
nios2_elf_final_gp (bfd *output_bfd, asymbol *symbol, bool relocatable,
char **error_message, bfd_vma *pgp)
{
if (bfd_is_und_section (symbol->section) && !relocatable)
{
*pgp = 0;
return bfd_reloc_undefined;
}
*pgp = _bfd_get_gp_value (output_bfd);
if (*pgp == 0 && (!relocatable || (symbol->flags & BSF_SECTION_SYM) != 0))
{
if (relocatable)
{
/* Make up a value. */
*pgp = symbol->section->output_section->vma + 0x4000;
_bfd_set_gp_value (output_bfd, *pgp);
}
else
{
*error_message
= (char *) _("global pointer relative relocation when _gp not defined");
return bfd_reloc_dangerous;
}
}
return bfd_reloc_ok;
}
/* Do the relocations that require special handling. */
static bfd_reloc_status_type
nios2_elf32_do_hi16_relocate (bfd *abfd, reloc_howto_type *howto,
asection *input_section,
bfd_byte *data, bfd_vma offset,
bfd_vma symbol_value, bfd_vma addend)
{
symbol_value = symbol_value + addend;
addend = 0;
symbol_value = (symbol_value >> 16) & 0xffff;
return _bfd_final_link_relocate (howto, abfd, input_section,
data, offset, symbol_value, addend);
}
static bfd_reloc_status_type
nios2_elf32_do_lo16_relocate (bfd *abfd, reloc_howto_type *howto,
asection *input_section,
bfd_byte *data, bfd_vma offset,
bfd_vma symbol_value, bfd_vma addend)
{
symbol_value = symbol_value + addend;
addend = 0;
symbol_value = symbol_value & 0xffff;
return _bfd_final_link_relocate (howto, abfd, input_section,
data, offset, symbol_value, addend);
}
static bfd_reloc_status_type
nios2_elf32_do_hiadj16_relocate (bfd *abfd, reloc_howto_type *howto,
asection *input_section,
bfd_byte *data, bfd_vma offset,
bfd_vma symbol_value, bfd_vma addend)
{
symbol_value = symbol_value + addend;
addend = 0;
symbol_value = hiadj(symbol_value);
return _bfd_final_link_relocate (howto, abfd, input_section, data, offset,
symbol_value, addend);
}
static bfd_reloc_status_type
nios2_elf32_do_pcrel_lo16_relocate (bfd *abfd, reloc_howto_type *howto,
asection *input_section,
bfd_byte *data, bfd_vma offset,
bfd_vma symbol_value, bfd_vma addend)
{
symbol_value = symbol_value + addend;
addend = 0;
symbol_value = symbol_value & 0xffff;
return _bfd_final_link_relocate (howto, abfd, input_section,
data, offset, symbol_value, addend);
}
static bfd_reloc_status_type
nios2_elf32_do_pcrel_hiadj16_relocate (bfd *abfd, reloc_howto_type *howto,
asection *input_section,
bfd_byte *data, bfd_vma offset,
bfd_vma symbol_value, bfd_vma addend)
{
symbol_value = symbol_value + addend;
symbol_value -= (input_section->output_section->vma
+ input_section->output_offset);
symbol_value -= offset;
addend = 0;
symbol_value = hiadj(symbol_value);
return _bfd_final_link_relocate (howto, abfd, input_section, data, offset,
symbol_value, addend);
}
static bfd_reloc_status_type
nios2_elf32_do_pcrel16_relocate (bfd *abfd, reloc_howto_type *howto,
asection *input_section,
bfd_byte *data, bfd_vma offset,
bfd_vma symbol_value, bfd_vma addend)
{
/* NIOS2 pc relative relocations are relative to the next 32-bit instruction
so we need to subtract 4 before doing a final_link_relocate. */
symbol_value = symbol_value + addend - 4;
addend = 0;
return _bfd_final_link_relocate (howto, abfd, input_section,
data, offset, symbol_value, addend);
}
static bfd_reloc_status_type
nios2_elf32_do_call26_relocate (bfd *abfd, reloc_howto_type *howto,
asection *input_section,
bfd_byte *data, bfd_vma offset,
bfd_vma symbol_value, bfd_vma addend)
{
/* Check that the relocation is in the same page as the current address. */
if (CALL26_SEGMENT (symbol_value + addend)
!= CALL26_SEGMENT (input_section->output_section->vma
+ input_section->output_offset
+ offset))
return bfd_reloc_overflow;
/* Check that the target address is correctly aligned on a 4-byte
boundary. */
if ((symbol_value + addend) & 0x3)
return bfd_reloc_overflow;
return _bfd_final_link_relocate (howto, abfd, input_section,
data, offset, symbol_value, addend);
}
static bfd_reloc_status_type
nios2_elf32_do_gprel_relocate (bfd *abfd, reloc_howto_type *howto,
asection *input_section,
bfd_byte *data, bfd_vma offset,
bfd_vma symbol_value, bfd_vma addend)
{
/* Because we need the output_bfd, the special handling is done
in nios2_elf32_relocate_section or in nios2_elf32_gprel_relocate. */
return _bfd_final_link_relocate (howto, abfd, input_section,
data, offset, symbol_value, addend);
}
static bfd_reloc_status_type
nios2_elf32_do_ujmp_relocate (bfd *abfd, reloc_howto_type *howto,
asection *input_section,
bfd_byte *data, bfd_vma offset,
bfd_vma symbol_value, bfd_vma addend)
{
bfd_vma symbol_lo16, symbol_hi16;
bfd_reloc_status_type r;
symbol_value = symbol_value + addend;
addend = 0;
symbol_hi16 = (symbol_value >> 16) & 0xffff;
symbol_lo16 = symbol_value & 0xffff;
r = _bfd_final_link_relocate (howto, abfd, input_section,
data, offset, symbol_hi16, addend);
if (r == bfd_reloc_ok)
return _bfd_final_link_relocate (howto, abfd, input_section,
data, offset + 4, symbol_lo16, addend);
return r;
}
static bfd_reloc_status_type
nios2_elf32_do_cjmp_relocate (bfd *abfd, reloc_howto_type *howto,
asection *input_section,
bfd_byte *data, bfd_vma offset,
bfd_vma symbol_value, bfd_vma addend)
{
bfd_vma symbol_lo16, symbol_hi16;
bfd_reloc_status_type r;
symbol_value = symbol_value + addend;
addend = 0;
symbol_hi16 = (symbol_value >> 16) & 0xffff;
symbol_lo16 = symbol_value & 0xffff;
r = _bfd_final_link_relocate (howto, abfd, input_section,
data, offset, symbol_hi16, addend);
if (r == bfd_reloc_ok)
return _bfd_final_link_relocate (howto, abfd, input_section,
data, offset + 4, symbol_lo16, addend);
return r;
}
static bfd_reloc_status_type
nios2_elf32_do_callr_relocate (bfd *abfd, reloc_howto_type *howto,
asection *input_section,
bfd_byte *data, bfd_vma offset,
bfd_vma symbol_value, bfd_vma addend)
{
bfd_vma symbol_lo16, symbol_hi16;
bfd_reloc_status_type r;
symbol_value = symbol_value + addend;
addend = 0;
symbol_hi16 = (symbol_value >> 16) & 0xffff;
symbol_lo16 = symbol_value & 0xffff;
r = _bfd_final_link_relocate (howto, abfd, input_section,
data, offset, symbol_hi16, addend);
if (r == bfd_reloc_ok)
return _bfd_final_link_relocate (howto, abfd, input_section,
data, offset + 4, symbol_lo16, addend);
return r;
}
/* HOWTO handlers for relocations that require special handling. */
/* This is for relocations used only when relaxing to ensure
changes in size of section don't screw up .align. */
static bfd_reloc_status_type
nios2_elf32_ignore_reloc (bfd *abfd ATTRIBUTE_UNUSED, arelent *reloc_entry,
asymbol *symbol ATTRIBUTE_UNUSED,
void *data ATTRIBUTE_UNUSED, asection *input_section,
bfd *output_bfd,
char **error_message ATTRIBUTE_UNUSED)
{
if (output_bfd != NULL)
reloc_entry->address += input_section->output_offset;
return bfd_reloc_ok;
}
static bfd_reloc_status_type
nios2_elf32_hi16_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
void *data, asection *input_section,
bfd *output_bfd,
char **error_message ATTRIBUTE_UNUSED)
{
/* This part is from bfd_elf_generic_reloc. */
if (output_bfd != NULL
&& (symbol->flags & BSF_SECTION_SYM) == 0
&& (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
{
reloc_entry->address += input_section->output_offset;
return bfd_reloc_ok;
}
if (output_bfd != NULL)
/* FIXME: See bfd_perform_relocation. Is this right? */
return bfd_reloc_continue;
return nios2_elf32_do_hi16_relocate (abfd, reloc_entry->howto,
input_section,
data, reloc_entry->address,
(symbol->value
+ symbol->section->output_section->vma
+ symbol->section->output_offset),
reloc_entry->addend);
}
static bfd_reloc_status_type
nios2_elf32_lo16_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
void *data, asection *input_section,
bfd *output_bfd,
char **error_message ATTRIBUTE_UNUSED)
{
/* This part is from bfd_elf_generic_reloc. */
if (output_bfd != NULL
&& (symbol->flags & BSF_SECTION_SYM) == 0
&& (!reloc_entry->howto->partial_inplace || reloc_entry->addend == 0))
{
reloc_entry->address += input_section->output_offset;
return bfd_reloc_ok;
}
if (output_bfd != NULL)
/* FIXME: See bfd_perform_relocation. Is this right? */
return bfd_reloc_continue;
return nios2_elf32_do_lo16_relocate (abfd, reloc_entry->howto,