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c95949892f
* aoutx.h: Replace "if (x) free (x)" with "free (x)" throughout. * archive.c, * bfd.c, * bfdio.c, * coff-alpha.c, * coff-ppc.c, * coff-sh.c, * coff-stgo32.c, * coffcode.h, * coffgen.c, * cofflink.c, * cpu-arm.c, * doc/chew.c, * dwarf2.c, * ecoff.c, * ecofflink.c, * elf-eh-frame.c, * elf-m10200.c, * elf-m10300.c, * elf-strtab.c, * elf.c, * elf32-arc.c, * elf32-arm.c, * elf32-avr.c, * elf32-bfin.c, * elf32-cr16.c, * elf32-crx.c, * elf32-epiphany.c, * elf32-ft32.c, * elf32-h8300.c, * elf32-ip2k.c, * elf32-m32c.c, * elf32-m68hc11.c, * elf32-m68k.c, * elf32-microblaze.c, * elf32-msp430.c, * elf32-nds32.c, * elf32-nios2.c, * elf32-ppc.c, * elf32-pru.c, * elf32-rl78.c, * elf32-rx.c, * elf32-sh.c, * elf32-spu.c, * elf32-v850.c, * elf32-xtensa.c, * elf64-alpha.c, * elf64-hppa.c, * elf64-ia64-vms.c, * elf64-mips.c * elf64-mmix.c, * elf64-ppc.c, * elf64-sparc.c, * elfcode.h, * elflink.c, * elfnn-ia64.c, * elfnn-riscv.c, * elfxx-mips.c, * elfxx-x86.c, * format.c, * ihex.c, * libbfd.c, * linker.c, * mmo.c, * opncls.c, * pdp11.c, * peXXigen.c, * pef.c, * peicode.h, * simple.c, * som.c, * srec.c, * stabs.c, * syms.c, * targets.c, * vms-lib.c, * xcofflink.c, * xtensa-isa.c: Likewise.
1609 lines
45 KiB
C
1609 lines
45 KiB
C
/* 32-bit ELF support for TI PRU.
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Copyright (C) 2014-2020 Free Software Foundation, Inc.
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Contributed by Dimitar Dimitrov <dimitar@dinux.eu>
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Based on elf32-nios2.c
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/* This file handles TI PRU ELF targets. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "libbfd.h"
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#include "bfdlink.h"
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#include "genlink.h"
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#include "elf-bfd.h"
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#include "elf/pru.h"
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#include "opcode/pru.h"
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#include "libiberty.h"
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/* All users of this file have bfd_octets_per_byte (abfd, sec) == 1. */
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#define OCTETS_PER_BYTE(ABFD, SEC) 1
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#define SWAP_VALS(A,B) \
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do { \
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(A) ^= (B); \
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(B) ^= (A); \
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(A) ^= (B); \
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} while (0)
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/* Enable debugging printout at stdout with this variable. */
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static bfd_boolean debug_relax = FALSE;
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/* Forward declarations. */
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static bfd_reloc_status_type pru_elf32_pmem_relocate
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(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
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static bfd_reloc_status_type pru_elf32_s10_pcrel_relocate
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(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
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static bfd_reloc_status_type pru_elf32_u8_pcrel_relocate
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(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
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static bfd_reloc_status_type pru_elf32_ldi32_relocate
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(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
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static bfd_reloc_status_type bfd_elf_pru_diff_relocate
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(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
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/* Target vector. */
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extern const bfd_target pru_elf32_vec;
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/* The relocation table used for SHT_REL sections. */
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static reloc_howto_type elf_pru_howto_table_rel[] = {
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/* No relocation. */
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HOWTO (R_PRU_NONE, /* type */
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0, /* rightshift */
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0, /* size (0 = byte, 1 = short, 2 = long) */
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3, /* bitsize */
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FALSE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont,/* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_PRU_NONE", /* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0, /* dst_mask */
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FALSE), /* pcrel_offset */
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HOWTO (R_PRU_16_PMEM,
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2,
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1, /* short */
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32,
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FALSE,
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0,
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complain_overflow_dont,
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bfd_elf_generic_reloc,
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"R_PRU_16_PMEM",
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FALSE,
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0, /* src_mask */
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0xffff,
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FALSE),
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HOWTO (R_PRU_U16_PMEMIMM,
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2,
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2,
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32,
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FALSE,
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8,
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complain_overflow_unsigned,
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pru_elf32_pmem_relocate,
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"R_PRU_U16_PMEMIMM",
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FALSE,
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0, /* src_mask */
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0x00ffff00,
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FALSE),
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HOWTO (R_PRU_BFD_RELOC_16,
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0,
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1, /* short */
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16,
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FALSE,
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0,
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complain_overflow_bitfield,
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bfd_elf_generic_reloc,
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"R_PRU_BFD_RELOC16",
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FALSE,
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0, /* src_mask */
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0x0000ffff,
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FALSE),
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/* 16-bit unsigned immediate relocation. */
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HOWTO (R_PRU_U16, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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FALSE, /* pc_relative */
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8, /* bitpos */
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complain_overflow_unsigned, /* complain on overflow */
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bfd_elf_generic_reloc, /* special function */
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"R_PRU_U16", /* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0x00ffff00, /* dest_mask */
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FALSE), /* pcrel_offset */
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HOWTO (R_PRU_32_PMEM,
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2,
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2, /* long */
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32,
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FALSE,
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0,
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complain_overflow_dont,
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pru_elf32_pmem_relocate,
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"R_PRU_32_PMEM",
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FALSE,
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0, /* src_mask */
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0xffffffff,
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FALSE),
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HOWTO (R_PRU_BFD_RELOC_32,
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0,
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2, /* long */
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32,
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FALSE,
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0,
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complain_overflow_dont,
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bfd_elf_generic_reloc,
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"R_PRU_BFD_RELOC32",
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FALSE,
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0, /* src_mask */
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0xffffffff,
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FALSE),
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HOWTO (R_PRU_S10_PCREL,
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2,
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2,
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10,
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TRUE,
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0,
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complain_overflow_bitfield,
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pru_elf32_s10_pcrel_relocate,
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"R_PRU_S10_PCREL",
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FALSE,
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0, /* src_mask */
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0x060000ff,
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TRUE),
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HOWTO (R_PRU_U8_PCREL,
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2,
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2,
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8,
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TRUE,
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0,
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complain_overflow_unsigned,
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pru_elf32_u8_pcrel_relocate,
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"R_PRU_U8_PCREL",
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FALSE,
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0, /* src_mask */
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0x000000ff,
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TRUE),
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HOWTO (R_PRU_LDI32,
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0, /* rightshift */
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4, /* size (4 = 8bytes) */
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32, /* bitsize */
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FALSE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_unsigned, /* complain on overflow */
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pru_elf32_ldi32_relocate, /* special function */
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"R_PRU_LDI32", /* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0xffffffff, /* dest_mask */
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FALSE), /* pcrel_offset */
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/* GNU-specific relocations. */
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HOWTO (R_PRU_GNU_BFD_RELOC_8,
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0,
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0, /* byte */
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8,
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FALSE,
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0,
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complain_overflow_bitfield,
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bfd_elf_generic_reloc,
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"R_PRU_BFD_RELOC8",
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FALSE,
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0, /* src_mask */
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0x000000ff,
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FALSE),
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HOWTO (R_PRU_GNU_DIFF8, /* type */
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0, /* rightshift */
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0, /* size (0 = byte, 1 = short, 2 = long) */
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8, /* bitsize */
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FALSE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_pru_diff_relocate, /* special_function */
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"R_PRU_DIFF8", /* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0xff, /* dst_mask */
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FALSE), /* pcrel_offset */
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HOWTO (R_PRU_GNU_DIFF16, /* type */
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0, /* rightshift */
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1, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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FALSE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_pru_diff_relocate,/* special_function */
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"R_PRU_DIFF16", /* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0xffff, /* dst_mask */
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FALSE), /* pcrel_offset */
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HOWTO (R_PRU_GNU_DIFF32, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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FALSE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_pru_diff_relocate,/* special_function */
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"R_PRU_DIFF32", /* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0xffffffff, /* dst_mask */
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FALSE), /* pcrel_offset */
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HOWTO (R_PRU_GNU_DIFF16_PMEM, /* type */
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0, /* rightshift */
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1, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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FALSE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_pru_diff_relocate,/* special_function */
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"R_PRU_DIFF16_PMEM", /* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0xffff, /* dst_mask */
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FALSE), /* pcrel_offset */
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HOWTO (R_PRU_GNU_DIFF32_PMEM, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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FALSE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_pru_diff_relocate,/* special_function */
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"R_PRU_DIFF32_PMEM", /* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0xffffffff, /* dst_mask */
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FALSE), /* pcrel_offset */
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/* Add other relocations here. */
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};
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static unsigned char elf_code_to_howto_index[R_PRU_ILLEGAL + 1];
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/* Return the howto for relocation RTYPE. */
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static reloc_howto_type *
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lookup_howto (unsigned int rtype)
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{
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static bfd_boolean initialized = FALSE;
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int i;
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int howto_tbl_size = (int) (sizeof (elf_pru_howto_table_rel)
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/ sizeof (elf_pru_howto_table_rel[0]));
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if (! initialized)
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{
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initialized = TRUE;
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memset (elf_code_to_howto_index, 0xff,
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sizeof (elf_code_to_howto_index));
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for (i = 0; i < howto_tbl_size; i++)
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elf_code_to_howto_index[elf_pru_howto_table_rel[i].type] = i;
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}
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if (rtype > R_PRU_ILLEGAL)
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return NULL;
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i = elf_code_to_howto_index[rtype];
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if (i >= howto_tbl_size)
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return NULL;
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return elf_pru_howto_table_rel + i;
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}
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/* Map for converting BFD reloc types to PRU reloc types. */
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struct elf_reloc_map
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{
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bfd_reloc_code_real_type bfd_val;
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enum elf_pru_reloc_type elf_val;
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};
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static const struct elf_reloc_map pru_reloc_map[] =
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{
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{BFD_RELOC_NONE, R_PRU_NONE},
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{BFD_RELOC_PRU_16_PMEM, R_PRU_16_PMEM},
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{BFD_RELOC_PRU_U16_PMEMIMM, R_PRU_U16_PMEMIMM},
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{BFD_RELOC_16, R_PRU_BFD_RELOC_16},
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{BFD_RELOC_PRU_U16, R_PRU_U16},
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{BFD_RELOC_PRU_32_PMEM, R_PRU_32_PMEM},
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{BFD_RELOC_32, R_PRU_BFD_RELOC_32},
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{BFD_RELOC_PRU_S10_PCREL, R_PRU_S10_PCREL},
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{BFD_RELOC_PRU_U8_PCREL, R_PRU_U8_PCREL},
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{BFD_RELOC_PRU_LDI32, R_PRU_LDI32},
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{BFD_RELOC_8, R_PRU_GNU_BFD_RELOC_8},
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{BFD_RELOC_PRU_GNU_DIFF8, R_PRU_GNU_DIFF8},
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{BFD_RELOC_PRU_GNU_DIFF16, R_PRU_GNU_DIFF16},
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{BFD_RELOC_PRU_GNU_DIFF32, R_PRU_GNU_DIFF32},
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{BFD_RELOC_PRU_GNU_DIFF16_PMEM, R_PRU_GNU_DIFF16_PMEM},
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{BFD_RELOC_PRU_GNU_DIFF32_PMEM, R_PRU_GNU_DIFF32_PMEM},
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};
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/* Assorted hash table functions. */
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/* Create an entry in a PRU ELF linker hash table. */
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static struct bfd_hash_entry *
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link_hash_newfunc (struct bfd_hash_entry *entry,
|
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struct bfd_hash_table *table, const char *string)
|
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{
|
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/* Allocate the structure if it has not already been allocated by a
|
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subclass. */
|
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if (entry == NULL)
|
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{
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entry = bfd_hash_allocate (table,
|
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sizeof (struct elf_link_hash_entry));
|
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if (entry == NULL)
|
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return entry;
|
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}
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||
|
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/* Call the allocation method of the superclass. */
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entry = _bfd_elf_link_hash_newfunc (entry, table, string);
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|
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return entry;
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}
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|
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/* Implement bfd_elf32_bfd_reloc_type_lookup:
|
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Given a BFD reloc type, return a howto structure. */
|
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|
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static reloc_howto_type *
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pru_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
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bfd_reloc_code_real_type code)
|
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{
|
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unsigned int i;
|
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|
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for (i = 0; i < ARRAY_SIZE (pru_reloc_map); ++i)
|
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if (pru_reloc_map[i].bfd_val == code)
|
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return lookup_howto ((unsigned int) pru_reloc_map[i].elf_val);
|
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return NULL;
|
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}
|
||
|
||
/* Implement bfd_elf32_bfd_reloc_name_lookup:
|
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Given a reloc name, return a howto structure. */
|
||
|
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static reloc_howto_type *
|
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pru_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
|
||
const char *r_name)
|
||
{
|
||
unsigned int i;
|
||
|
||
for (i = 0; i < ARRAY_SIZE (elf_pru_howto_table_rel); i++)
|
||
if (elf_pru_howto_table_rel[i].name
|
||
&& strcasecmp (elf_pru_howto_table_rel[i].name, r_name) == 0)
|
||
return &elf_pru_howto_table_rel[i];
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/* Implement elf_info_to_howto:
|
||
Given a ELF32 relocation, fill in a arelent structure. */
|
||
|
||
static bfd_boolean
|
||
pru_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 (r_type >= R_PRU_ILLEGAL)
|
||
{
|
||
/* 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 = lookup_howto (r_type);
|
||
return cache_ptr->howto != NULL;
|
||
}
|
||
|
||
/* Do the relocations that require special handling. */
|
||
/* Produce a word address for program memory. Linker scripts will put .text
|
||
at a high offset in order to differentiate it from .data. So here we also
|
||
mask the high bits of PMEM address.
|
||
|
||
But why 1MB when internal Program Memory much smaller? We want to catch
|
||
unintended overflows.
|
||
|
||
Why not use (1<<31) as an offset and a mask? Sitara DDRAM usually resides
|
||
there, and users might want to put some shared carveout memory region in
|
||
their linker scripts. So 0x80000000 might be a valid .data address.
|
||
|
||
Note that we still keep and pass down the original howto. This way we
|
||
can reuse this function for several different relocations. */
|
||
static bfd_reloc_status_type
|
||
pru_elf32_do_pmem_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 &= 0x3fffff;
|
||
return _bfd_final_link_relocate (howto, abfd, input_section,
|
||
data, offset, symbol_value, addend);
|
||
}
|
||
|
||
/* Direct copy of _bfd_final_link_relocate, but with special
|
||
"fill-in". This copy-paste mumbo jumbo is only needed because BFD
|
||
cannot deal correctly with non-contiguous bit fields. */
|
||
static bfd_reloc_status_type
|
||
pru_elf32_do_s10_pcrel_relocate (bfd *input_bfd, reloc_howto_type *howto,
|
||
asection *input_section,
|
||
bfd_byte *contents, bfd_vma address,
|
||
bfd_vma relocation, bfd_vma addend)
|
||
{
|
||
bfd_byte *location;
|
||
bfd_vma x = 0;
|
||
bfd_vma qboff;
|
||
bfd_reloc_status_type flag = bfd_reloc_ok;
|
||
|
||
/* Sanity check the address. */
|
||
if (address > bfd_get_section_limit (input_bfd, input_section))
|
||
return bfd_reloc_outofrange;
|
||
|
||
BFD_ASSERT (howto->pc_relative);
|
||
BFD_ASSERT (howto->pcrel_offset);
|
||
|
||
relocation = relocation + addend - (input_section->output_section->vma
|
||
+ input_section->output_offset) - address;
|
||
|
||
location = contents + address;
|
||
|
||
/* Get the value we are going to relocate. */
|
||
BFD_ASSERT (bfd_get_reloc_size (howto) == 4);
|
||
x = bfd_get_32 (input_bfd, location);
|
||
|
||
qboff = GET_BROFF_SIGNED (x) << howto->rightshift;
|
||
relocation += qboff;
|
||
|
||
BFD_ASSERT (howto->complain_on_overflow == complain_overflow_bitfield);
|
||
|
||
if (relocation > 2047 && relocation < (bfd_vma)-2048l)
|
||
flag = bfd_reloc_overflow;
|
||
|
||
/* Check that target address is word-aligned. */
|
||
if (relocation & ((1 << howto->rightshift) - 1))
|
||
flag = bfd_reloc_outofrange;
|
||
|
||
relocation >>= (bfd_vma) howto->rightshift;
|
||
|
||
/* Fill-in the RELOCATION to the right bits of X. */
|
||
SET_BROFF_URAW (x, relocation);
|
||
|
||
bfd_put_32 (input_bfd, x, location);
|
||
|
||
return flag;
|
||
}
|
||
|
||
static bfd_reloc_status_type
|
||
pru_elf32_do_u8_pcrel_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 relocation;
|
||
|
||
BFD_ASSERT (howto->pc_relative);
|
||
BFD_ASSERT (howto->pcrel_offset);
|
||
|
||
relocation = symbol_value + addend - (input_section->output_section->vma
|
||
+ input_section->output_offset) - offset;
|
||
relocation >>= howto->rightshift;
|
||
|
||
/* 0 and 1 are invalid target labels for LOOP. We cannot
|
||
encode this info in HOWTO, so catch such cases here. */
|
||
if (relocation < 2)
|
||
return bfd_reloc_outofrange;
|
||
|
||
return _bfd_final_link_relocate (howto, abfd, input_section,
|
||
data, offset, symbol_value, addend);
|
||
}
|
||
|
||
/* Idea and code taken from elf32-d30v. */
|
||
static bfd_reloc_status_type
|
||
pru_elf32_do_ldi32_relocate (bfd *abfd, reloc_howto_type *howto,
|
||
asection *input_section,
|
||
bfd_byte *data, bfd_vma offset,
|
||
bfd_vma symbol_value, bfd_vma addend)
|
||
{
|
||
bfd_signed_vma relocation;
|
||
bfd_size_type octets = offset * OCTETS_PER_BYTE (abfd, input_section);
|
||
bfd_byte *location;
|
||
unsigned long in1, in2;
|
||
|
||
/* A hacked-up version of _bfd_final_link_relocate() follows. */
|
||
|
||
/* Sanity check the address. */
|
||
if (octets + bfd_get_reloc_size (howto)
|
||
> bfd_get_section_limit_octets (abfd, input_section))
|
||
return bfd_reloc_outofrange;
|
||
|
||
/* This function assumes that we are dealing with a basic relocation
|
||
against a symbol. We want to compute the value of the symbol to
|
||
relocate to. This is just VALUE, the value of the symbol, plus
|
||
ADDEND, any addend associated with the reloc. */
|
||
relocation = symbol_value + addend;
|
||
|
||
BFD_ASSERT (!howto->pc_relative);
|
||
|
||
/* A hacked-up version of _bfd_relocate_contents() follows. */
|
||
location = data + octets;
|
||
|
||
BFD_ASSERT (!howto->pc_relative);
|
||
|
||
in1 = bfd_get_32 (abfd, location);
|
||
in2 = bfd_get_32 (abfd, location + 4);
|
||
|
||
SET_INSN_FIELD (IMM16, in1, relocation >> 16);
|
||
SET_INSN_FIELD (IMM16, in2, relocation & 0xffff);
|
||
|
||
bfd_put_32 (abfd, in1, location);
|
||
bfd_put_32 (abfd, in2, location + 4);
|
||
|
||
/* Old GAS and LD versions have a bug, where the two
|
||
LDI instructions are swapped. Detect such object
|
||
files and bail. */
|
||
if (GET_INSN_FIELD (RDSEL, in1) != RSEL_31_16)
|
||
{
|
||
/* xgettext:c-format */
|
||
_bfd_error_handler (_("error: %pB: old incompatible object file detected"),
|
||
abfd);
|
||
return bfd_reloc_notsupported;
|
||
}
|
||
|
||
return bfd_reloc_ok;
|
||
}
|
||
|
||
/* HOWTO handlers for relocations that require special handling. */
|
||
|
||
static bfd_reloc_status_type
|
||
pru_elf32_pmem_relocate (bfd *abfd, arelent *reloc_entry,
|
||
asymbol *symbol, void *data,
|
||
asection *input_section, bfd *output_bfd,
|
||
char **error_message)
|
||
{
|
||
/* If this is a relocatable link (output_bfd test tells us), just
|
||
call the generic function. Any adjustment will be done at final
|
||
link time. */
|
||
if (output_bfd != NULL)
|
||
return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
|
||
input_section, output_bfd, error_message);
|
||
|
||
BFD_ASSERT (0);
|
||
return pru_elf32_do_pmem_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
|
||
pru_elf32_s10_pcrel_relocate (bfd *abfd, arelent *reloc_entry,
|
||
asymbol *symbol, void *data,
|
||
asection *input_section, bfd *output_bfd,
|
||
char **error_message)
|
||
{
|
||
/* If this is a relocatable link (output_bfd test tells us), just
|
||
call the generic function. Any adjustment will be done at final
|
||
link time. */
|
||
if (output_bfd != NULL)
|
||
return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
|
||
input_section, output_bfd, error_message);
|
||
|
||
return pru_elf32_do_s10_pcrel_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
|
||
pru_elf32_u8_pcrel_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
|
||
void *data, asection *input_section,
|
||
bfd *output_bfd,
|
||
char **error_message)
|
||
{
|
||
/* If this is a relocatable link (output_bfd test tells us), just
|
||
call the generic function. Any adjustment will be done at final
|
||
link time. */
|
||
if (output_bfd != NULL)
|
||
return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
|
||
input_section, output_bfd, error_message);
|
||
|
||
return pru_elf32_do_u8_pcrel_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
|
||
pru_elf32_ldi32_relocate (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
|
||
void *data, asection *input_section,
|
||
bfd *output_bfd,
|
||
char **error_message)
|
||
{
|
||
/* If this is a relocatable link (output_bfd test tells us), just
|
||
call the generic function. Any adjustment will be done at final
|
||
link time. */
|
||
if (output_bfd != NULL)
|
||
return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
|
||
input_section, output_bfd, error_message);
|
||
|
||
return pru_elf32_do_ldi32_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);
|
||
}
|
||
|
||
|
||
/* Implement elf_backend_relocate_section. */
|
||
static bfd_boolean
|
||
pru_elf32_relocate_section (bfd *output_bfd,
|
||
struct bfd_link_info *info,
|
||
bfd *input_bfd,
|
||
asection *input_section,
|
||
bfd_byte *contents,
|
||
Elf_Internal_Rela *relocs,
|
||
Elf_Internal_Sym *local_syms,
|
||
asection **local_sections)
|
||
{
|
||
struct bfd_elf_section_data * esd = elf_section_data (input_section);
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
Elf_Internal_Rela *rel;
|
||
Elf_Internal_Rela *relend;
|
||
bfd_boolean is_rel_reloc;
|
||
|
||
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
|
||
sym_hashes = elf_sym_hashes (input_bfd);
|
||
relend = relocs + input_section->reloc_count;
|
||
|
||
/* See if we have a REL type relocation. */
|
||
is_rel_reloc = (esd->rel.hdr != NULL);
|
||
/* Sanity check - only one type of relocation per section.
|
||
FIXME: Theoretically it is possible to have both types,
|
||
but if that happens how can we distinguish between the two ? */
|
||
BFD_ASSERT (! is_rel_reloc || ! esd->rela.hdr);
|
||
|
||
for (rel = relocs; rel < relend; rel++)
|
||
{
|
||
reloc_howto_type *howto;
|
||
unsigned long r_symndx;
|
||
Elf_Internal_Sym *sym;
|
||
asection *sec;
|
||
struct elf_link_hash_entry *h;
|
||
bfd_vma relocation;
|
||
bfd_reloc_status_type r = bfd_reloc_ok;
|
||
const char *name = NULL;
|
||
const char* msg = (const char*) NULL;
|
||
bfd_boolean unresolved_reloc;
|
||
bfd_vma addend;
|
||
|
||
/* If we are using a REL relocation then the addend should be empty. */
|
||
BFD_ASSERT (! is_rel_reloc || rel->r_addend == 0);
|
||
|
||
r_symndx = ELF32_R_SYM (rel->r_info);
|
||
|
||
howto = lookup_howto ((unsigned) ELF32_R_TYPE (rel->r_info));
|
||
h = NULL;
|
||
sym = NULL;
|
||
sec = NULL;
|
||
|
||
if (r_symndx < symtab_hdr->sh_info)
|
||
{
|
||
sym = local_syms + r_symndx;
|
||
sec = local_sections[r_symndx];
|
||
relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
|
||
}
|
||
else
|
||
{
|
||
bfd_boolean warned, ignored;
|
||
|
||
RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
|
||
r_symndx, symtab_hdr, sym_hashes,
|
||
h, sec, relocation,
|
||
unresolved_reloc, warned, ignored);
|
||
}
|
||
|
||
if (sec && discarded_section (sec))
|
||
RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
|
||
rel, 1, relend, howto, 0, contents);
|
||
|
||
/* Nothing more to do unless this is a final link. */
|
||
if (bfd_link_relocatable (info))
|
||
continue;
|
||
|
||
if (howto)
|
||
{
|
||
switch (howto->type)
|
||
{
|
||
case R_PRU_NONE:
|
||
/* We don't need to find a value for this symbol. It's just a
|
||
marker. */
|
||
r = bfd_reloc_ok;
|
||
break;
|
||
|
||
case R_PRU_U16:
|
||
if (is_rel_reloc)
|
||
{
|
||
unsigned long insn;
|
||
insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
|
||
addend = GET_INSN_FIELD (IMM16, insn);
|
||
}
|
||
else
|
||
addend = rel->r_addend;
|
||
r = _bfd_final_link_relocate (howto, input_bfd,
|
||
input_section, contents,
|
||
rel->r_offset, relocation,
|
||
addend);
|
||
break;
|
||
|
||
case R_PRU_U16_PMEMIMM:
|
||
case R_PRU_32_PMEM:
|
||
case R_PRU_16_PMEM:
|
||
if (is_rel_reloc && howto->type == R_PRU_U16_PMEMIMM)
|
||
{
|
||
unsigned long insn;
|
||
insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
|
||
addend = GET_INSN_FIELD (IMM16, insn) << 2;
|
||
}
|
||
else if (is_rel_reloc && howto->type == R_PRU_32_PMEM)
|
||
{
|
||
addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
|
||
addend <<= 2;
|
||
}
|
||
else if (is_rel_reloc && howto->type == R_PRU_16_PMEM)
|
||
{
|
||
addend = bfd_get_16 (input_bfd, contents + rel->r_offset);
|
||
addend <<= 2;
|
||
}
|
||
else
|
||
{
|
||
BFD_ASSERT (!is_rel_reloc);
|
||
addend = rel->r_addend;
|
||
}
|
||
r = pru_elf32_do_pmem_relocate (input_bfd, howto,
|
||
input_section,
|
||
contents, rel->r_offset,
|
||
relocation, addend);
|
||
break;
|
||
case R_PRU_S10_PCREL:
|
||
BFD_ASSERT (! is_rel_reloc);
|
||
r = pru_elf32_do_s10_pcrel_relocate (input_bfd, howto,
|
||
input_section,
|
||
contents,
|
||
rel->r_offset,
|
||
relocation,
|
||
rel->r_addend);
|
||
break;
|
||
case R_PRU_U8_PCREL:
|
||
BFD_ASSERT (! is_rel_reloc);
|
||
r = pru_elf32_do_u8_pcrel_relocate (input_bfd, howto,
|
||
input_section,
|
||
contents,
|
||
rel->r_offset,
|
||
relocation,
|
||
rel->r_addend);
|
||
break;
|
||
case R_PRU_LDI32:
|
||
if (is_rel_reloc)
|
||
{
|
||
unsigned long in1, in2;
|
||
in1 = bfd_get_32 (input_bfd, contents + rel->r_offset);
|
||
in2 = bfd_get_32 (input_bfd, contents + rel->r_offset + 4);
|
||
addend = (GET_INSN_FIELD (IMM16, in1) << 16)
|
||
| GET_INSN_FIELD (IMM16, in2);
|
||
}
|
||
else
|
||
{
|
||
addend = rel->r_addend;
|
||
}
|
||
r = pru_elf32_do_ldi32_relocate (input_bfd, howto,
|
||
input_section,
|
||
contents,
|
||
rel->r_offset,
|
||
relocation,
|
||
addend);
|
||
break;
|
||
case R_PRU_GNU_DIFF8:
|
||
case R_PRU_GNU_DIFF16:
|
||
case R_PRU_GNU_DIFF32:
|
||
case R_PRU_GNU_DIFF16_PMEM:
|
||
case R_PRU_GNU_DIFF32_PMEM:
|
||
/* GNU extensions support only rela. */
|
||
BFD_ASSERT (! is_rel_reloc);
|
||
/* Nothing to do here, as contents already contain the
|
||
diff value. */
|
||
r = bfd_reloc_ok;
|
||
break;
|
||
|
||
case R_PRU_BFD_RELOC_16:
|
||
if (is_rel_reloc)
|
||
addend = bfd_get_16 (input_bfd, contents + rel->r_offset);
|
||
else
|
||
addend = rel->r_addend;
|
||
r = _bfd_final_link_relocate (howto, input_bfd,
|
||
input_section, contents,
|
||
rel->r_offset, relocation,
|
||
addend);
|
||
break;
|
||
|
||
case R_PRU_BFD_RELOC_32:
|
||
if (is_rel_reloc)
|
||
addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
|
||
else
|
||
addend = rel->r_addend;
|
||
r = _bfd_final_link_relocate (howto, input_bfd,
|
||
input_section, contents,
|
||
rel->r_offset, relocation,
|
||
addend);
|
||
break;
|
||
|
||
case R_PRU_GNU_BFD_RELOC_8:
|
||
BFD_ASSERT (! is_rel_reloc);
|
||
r = _bfd_final_link_relocate (howto, input_bfd,
|
||
input_section, contents,
|
||
rel->r_offset, relocation,
|
||
rel->r_addend);
|
||
break;
|
||
|
||
default:
|
||
BFD_ASSERT (0);
|
||
break;
|
||
}
|
||
}
|
||
else
|
||
r = bfd_reloc_notsupported;
|
||
|
||
if (r != bfd_reloc_ok)
|
||
{
|
||
if (h != NULL)
|
||
name = h->root.root.string;
|
||
else
|
||
{
|
||
name = bfd_elf_string_from_elf_section (input_bfd,
|
||
symtab_hdr->sh_link,
|
||
sym->st_name);
|
||
if (name == NULL || *name == '\0')
|
||
name = bfd_section_name (sec);
|
||
}
|
||
|
||
switch (r)
|
||
{
|
||
case bfd_reloc_overflow:
|
||
(*info->callbacks->reloc_overflow) (info, NULL, name,
|
||
howto->name, (bfd_vma) 0,
|
||
input_bfd, input_section,
|
||
rel->r_offset);
|
||
break;
|
||
|
||
case bfd_reloc_undefined:
|
||
(*info->callbacks->undefined_symbol) (info, name, input_bfd,
|
||
input_section,
|
||
rel->r_offset, TRUE);
|
||
break;
|
||
|
||
case bfd_reloc_outofrange:
|
||
if (msg == NULL)
|
||
msg = _("relocation out of range");
|
||
break;
|
||
|
||
case bfd_reloc_notsupported:
|
||
if (msg == NULL)
|
||
msg = _("unsupported relocation");
|
||
break;
|
||
|
||
case bfd_reloc_dangerous:
|
||
if (msg == NULL)
|
||
msg = _("dangerous relocation");
|
||
break;
|
||
|
||
default:
|
||
if (msg == NULL)
|
||
msg = _("unknown error");
|
||
break;
|
||
}
|
||
|
||
if (msg)
|
||
{
|
||
(*info->callbacks->warning) (info, msg, name, input_bfd,
|
||
input_section, rel->r_offset);
|
||
return FALSE;
|
||
}
|
||
}
|
||
}
|
||
return TRUE;
|
||
}
|
||
|
||
|
||
/* Perform a diff relocation. Nothing to do, as the difference value is
|
||
already written into the section's contents. */
|
||
|
||
static bfd_reloc_status_type
|
||
bfd_elf_pru_diff_relocate (bfd *abfd ATTRIBUTE_UNUSED,
|
||
arelent *reloc_entry ATTRIBUTE_UNUSED,
|
||
asymbol *symbol ATTRIBUTE_UNUSED,
|
||
void *data ATTRIBUTE_UNUSED,
|
||
asection *input_section ATTRIBUTE_UNUSED,
|
||
bfd *output_bfd ATTRIBUTE_UNUSED,
|
||
char **error_message ATTRIBUTE_UNUSED)
|
||
{
|
||
return bfd_reloc_ok;
|
||
}
|
||
|
||
|
||
/* Returns whether the relocation type passed is a diff reloc. */
|
||
|
||
static bfd_boolean
|
||
elf32_pru_is_diff_reloc (Elf_Internal_Rela *irel)
|
||
{
|
||
return (ELF32_R_TYPE (irel->r_info) == R_PRU_GNU_DIFF8
|
||
|| ELF32_R_TYPE (irel->r_info) == R_PRU_GNU_DIFF16
|
||
|| ELF32_R_TYPE (irel->r_info) == R_PRU_GNU_DIFF32
|
||
|| ELF32_R_TYPE (irel->r_info) == R_PRU_GNU_DIFF16_PMEM
|
||
|| ELF32_R_TYPE (irel->r_info) == R_PRU_GNU_DIFF32_PMEM);
|
||
}
|
||
|
||
/* Reduce the diff value written in the section by count if the shrinked
|
||
insn address happens to fall between the two symbols for which this
|
||
diff reloc was emitted. */
|
||
|
||
static void
|
||
elf32_pru_adjust_diff_reloc_value (bfd *abfd,
|
||
struct bfd_section *isec,
|
||
Elf_Internal_Rela *irel,
|
||
bfd_vma symval,
|
||
bfd_vma shrinked_insn_address,
|
||
int count)
|
||
{
|
||
unsigned char *reloc_contents = NULL;
|
||
unsigned char *isec_contents = elf_section_data (isec)->this_hdr.contents;
|
||
if (isec_contents == NULL)
|
||
{
|
||
if (! bfd_malloc_and_get_section (abfd, isec, &isec_contents))
|
||
return;
|
||
|
||
elf_section_data (isec)->this_hdr.contents = isec_contents;
|
||
}
|
||
|
||
reloc_contents = isec_contents + irel->r_offset;
|
||
|
||
/* Read value written in object file. */
|
||
bfd_signed_vma x = 0;
|
||
switch (ELF32_R_TYPE (irel->r_info))
|
||
{
|
||
case R_PRU_GNU_DIFF8:
|
||
{
|
||
x = bfd_get_signed_8 (abfd, reloc_contents);
|
||
break;
|
||
}
|
||
case R_PRU_GNU_DIFF16:
|
||
{
|
||
x = bfd_get_signed_16 (abfd, reloc_contents);
|
||
break;
|
||
}
|
||
case R_PRU_GNU_DIFF32:
|
||
{
|
||
x = bfd_get_signed_32 (abfd, reloc_contents);
|
||
break;
|
||
}
|
||
case R_PRU_GNU_DIFF16_PMEM:
|
||
{
|
||
x = bfd_get_signed_16 (abfd, reloc_contents) * 4;
|
||
break;
|
||
}
|
||
case R_PRU_GNU_DIFF32_PMEM:
|
||
{
|
||
x = bfd_get_signed_32 (abfd, reloc_contents) * 4;
|
||
break;
|
||
}
|
||
default:
|
||
{
|
||
BFD_FAIL ();
|
||
}
|
||
}
|
||
|
||
/* For a diff reloc sym1 - sym2 the diff at assembly time (x) is written
|
||
into the object file at the reloc offset. sym2's logical value is
|
||
symval (<start_of_section>) + reloc addend. Compute the start and end
|
||
addresses and check if the shrinked insn falls between sym1 and sym2. */
|
||
|
||
bfd_vma end_address = symval + irel->r_addend;
|
||
bfd_vma start_address = end_address - x;
|
||
|
||
/* Shrink the absolute DIFF value (get the to labels "closer"
|
||
together), because we have removed data between labels. */
|
||
if (x < 0)
|
||
{
|
||
x += count;
|
||
/* In case the signed x is negative, restore order. */
|
||
SWAP_VALS (end_address, start_address);
|
||
}
|
||
else
|
||
{
|
||
x -= count;
|
||
}
|
||
|
||
/* Reduce the diff value by count bytes and write it back into section
|
||
contents. */
|
||
|
||
if (shrinked_insn_address >= start_address
|
||
&& shrinked_insn_address <= end_address)
|
||
{
|
||
switch (ELF32_R_TYPE (irel->r_info))
|
||
{
|
||
case R_PRU_GNU_DIFF8:
|
||
{
|
||
bfd_put_signed_8 (abfd, x & 0xFF, reloc_contents);
|
||
break;
|
||
}
|
||
case R_PRU_GNU_DIFF16:
|
||
{
|
||
bfd_put_signed_16 (abfd, x & 0xFFFF, reloc_contents);
|
||
break;
|
||
}
|
||
case R_PRU_GNU_DIFF32:
|
||
{
|
||
bfd_put_signed_32 (abfd, x & 0xFFFFFFFF, reloc_contents);
|
||
break;
|
||
}
|
||
case R_PRU_GNU_DIFF16_PMEM:
|
||
{
|
||
bfd_put_signed_16 (abfd, (x / 4) & 0xFFFF, reloc_contents);
|
||
break;
|
||
}
|
||
case R_PRU_GNU_DIFF32_PMEM:
|
||
{
|
||
bfd_put_signed_32 (abfd, (x / 4) & 0xFFFFFFFF, reloc_contents);
|
||
break;
|
||
}
|
||
default:
|
||
{
|
||
BFD_FAIL ();
|
||
}
|
||
}
|
||
|
||
}
|
||
}
|
||
|
||
/* Delete some bytes from a section while changing the size of an instruction.
|
||
The parameter "addr" denotes the section-relative offset pointing just
|
||
behind the shrinked instruction. "addr+count" point at the first
|
||
byte just behind the original unshrinked instruction.
|
||
|
||
Idea copied from the AVR port. */
|
||
|
||
static bfd_boolean
|
||
pru_elf_relax_delete_bytes (bfd *abfd,
|
||
asection *sec,
|
||
bfd_vma addr,
|
||
int count)
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
unsigned int sec_shndx;
|
||
bfd_byte *contents;
|
||
Elf_Internal_Rela *irel, *irelend;
|
||
Elf_Internal_Sym *isym;
|
||
Elf_Internal_Sym *isymbuf = NULL;
|
||
bfd_vma toaddr;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
struct elf_link_hash_entry **end_hashes;
|
||
unsigned int symcount;
|
||
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
|
||
contents = elf_section_data (sec)->this_hdr.contents;
|
||
|
||
toaddr = sec->size;
|
||
|
||
irel = elf_section_data (sec)->relocs;
|
||
irelend = irel + sec->reloc_count;
|
||
|
||
/* Actually delete the bytes. */
|
||
if (toaddr - addr - count > 0)
|
||
memmove (contents + addr, contents + addr + count,
|
||
(size_t) (toaddr - addr - count));
|
||
sec->size -= count;
|
||
|
||
/* Adjust all the reloc addresses. */
|
||
for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
|
||
{
|
||
bfd_vma old_reloc_address;
|
||
|
||
old_reloc_address = (sec->output_section->vma
|
||
+ sec->output_offset + irel->r_offset);
|
||
|
||
/* Get the new reloc address. */
|
||
if ((irel->r_offset > addr
|
||
&& irel->r_offset < toaddr))
|
||
{
|
||
if (debug_relax)
|
||
printf ("Relocation at address 0x%x needs to be moved.\n"
|
||
"Old section offset: 0x%x, New section offset: 0x%x \n",
|
||
(unsigned int) old_reloc_address,
|
||
(unsigned int) irel->r_offset,
|
||
(unsigned int) ((irel->r_offset) - count));
|
||
|
||
irel->r_offset -= count;
|
||
}
|
||
|
||
}
|
||
|
||
/* The reloc's own addresses are now ok. However, we need to readjust
|
||
the reloc's addend, i.e. the reloc's value if two conditions are met:
|
||
1.) the reloc is relative to a symbol in this section that
|
||
is located in front of the shrinked instruction
|
||
2.) symbol plus addend end up behind the shrinked instruction.
|
||
|
||
The most common case where this happens are relocs relative to
|
||
the section-start symbol.
|
||
|
||
This step needs to be done for all of the sections of the bfd. */
|
||
|
||
{
|
||
struct bfd_section *isec;
|
||
|
||
for (isec = abfd->sections; isec; isec = isec->next)
|
||
{
|
||
bfd_vma symval;
|
||
bfd_vma shrinked_insn_address;
|
||
|
||
if (isec->reloc_count == 0)
|
||
continue;
|
||
|
||
shrinked_insn_address = (sec->output_section->vma
|
||
+ sec->output_offset + addr);
|
||
|
||
irel = elf_section_data (isec)->relocs;
|
||
/* PR 12161: Read in the relocs for this section if necessary. */
|
||
if (irel == NULL)
|
||
irel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, TRUE);
|
||
|
||
for (irelend = irel + isec->reloc_count;
|
||
irel < irelend;
|
||
irel++)
|
||
{
|
||
/* Read this BFD's local symbols if we haven't done
|
||
so already. */
|
||
if (isymbuf == NULL && symtab_hdr->sh_info != 0)
|
||
{
|
||
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 == NULL)
|
||
return FALSE;
|
||
}
|
||
|
||
/* Get the value of the symbol referred to by the reloc. */
|
||
if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
|
||
{
|
||
/* A local symbol. */
|
||
asection *sym_sec;
|
||
|
||
isym = isymbuf + ELF32_R_SYM (irel->r_info);
|
||
sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
|
||
symval = isym->st_value;
|
||
/* If the reloc is absolute, it will not have
|
||
a symbol or section associated with it. */
|
||
if (sym_sec == sec)
|
||
{
|
||
symval += sym_sec->output_section->vma
|
||
+ sym_sec->output_offset;
|
||
|
||
if (debug_relax)
|
||
printf ("Checking if the relocation's "
|
||
"addend needs corrections.\n"
|
||
"Address of anchor symbol: 0x%x \n"
|
||
"Address of relocation target: 0x%x \n"
|
||
"Address of relaxed insn: 0x%x \n",
|
||
(unsigned int) symval,
|
||
(unsigned int) (symval + irel->r_addend),
|
||
(unsigned int) shrinked_insn_address);
|
||
|
||
/* Shrink the special DIFF relocations. */
|
||
if (elf32_pru_is_diff_reloc (irel))
|
||
{
|
||
elf32_pru_adjust_diff_reloc_value (abfd, isec, irel,
|
||
symval,
|
||
shrinked_insn_address,
|
||
count);
|
||
}
|
||
|
||
/* Fix the addend, if it is affected. */
|
||
if (symval <= shrinked_insn_address
|
||
&& (symval + irel->r_addend) > shrinked_insn_address)
|
||
{
|
||
|
||
irel->r_addend -= count;
|
||
|
||
if (debug_relax)
|
||
printf ("Relocation's addend needed to be fixed \n");
|
||
}
|
||
}
|
||
/* else...Reference symbol is absolute.
|
||
No adjustment needed. */
|
||
}
|
||
/* else...Reference symbol is extern. No need for adjusting
|
||
the addend. */
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Adjust the local symbols defined in this section. */
|
||
isym = (Elf_Internal_Sym *) symtab_hdr->contents;
|
||
/* Fix PR 9841, there may be no local symbols. */
|
||
if (isym != NULL)
|
||
{
|
||
Elf_Internal_Sym *isymend;
|
||
|
||
isymend = isym + symtab_hdr->sh_info;
|
||
for (; isym < isymend; isym++)
|
||
{
|
||
if (isym->st_shndx == sec_shndx)
|
||
{
|
||
if (isym->st_value > addr
|
||
&& isym->st_value <= toaddr)
|
||
isym->st_value -= count;
|
||
|
||
if (isym->st_value <= addr
|
||
&& isym->st_value + isym->st_size > addr)
|
||
{
|
||
/* If this assert fires then we have a symbol that ends
|
||
part way through an instruction. Does that make
|
||
sense? */
|
||
BFD_ASSERT (isym->st_value + isym->st_size >= addr + count);
|
||
isym->st_size -= count;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Now adjust the global symbols defined in this section. */
|
||
symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
|
||
- symtab_hdr->sh_info);
|
||
sym_hashes = elf_sym_hashes (abfd);
|
||
end_hashes = sym_hashes + symcount;
|
||
for (; sym_hashes < end_hashes; sym_hashes++)
|
||
{
|
||
struct elf_link_hash_entry *sym_hash = *sym_hashes;
|
||
if ((sym_hash->root.type == bfd_link_hash_defined
|
||
|| sym_hash->root.type == bfd_link_hash_defweak)
|
||
&& sym_hash->root.u.def.section == sec)
|
||
{
|
||
if (sym_hash->root.u.def.value > addr
|
||
&& sym_hash->root.u.def.value <= toaddr)
|
||
sym_hash->root.u.def.value -= count;
|
||
|
||
if (sym_hash->root.u.def.value <= addr
|
||
&& (sym_hash->root.u.def.value + sym_hash->size > addr))
|
||
{
|
||
/* If this assert fires then we have a symbol that ends
|
||
part way through an instruction. Does that make
|
||
sense? */
|
||
BFD_ASSERT (sym_hash->root.u.def.value + sym_hash->size
|
||
>= addr + count);
|
||
sym_hash->size -= count;
|
||
}
|
||
}
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
static bfd_boolean
|
||
pru_elf32_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;
|
||
Elf_Internal_Rela * irelend;
|
||
bfd_byte * contents = NULL;
|
||
Elf_Internal_Sym * isymbuf = NULL;
|
||
|
||
/* Assume nothing changes. */
|
||
*again = FALSE;
|
||
|
||
/* We don't have to do anything for a relocatable link, if
|
||
this section does not have relocs, or if this is not a
|
||
code section. */
|
||
if (bfd_link_relocatable (link_info)
|
||
|| (sec->flags & SEC_RELOC) == 0
|
||
|| sec->reloc_count == 0 || (sec->flags & SEC_CODE) == 0)
|
||
return TRUE;
|
||
|
||
symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
|
||
|
||
/* Get a copy of the native relocations. */
|
||
internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, 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;
|
||
|
||
/* Get the section contents if we haven't done so already. */
|
||
if (contents == NULL)
|
||
{
|
||
/* Get cached copy if it exists. */
|
||
if (elf_section_data (sec)->this_hdr.contents != NULL)
|
||
contents = elf_section_data (sec)->this_hdr.contents;
|
||
else if (! bfd_malloc_and_get_section (abfd, sec, &contents))
|
||
goto error_return;
|
||
}
|
||
|
||
/* Read this BFD's local symbols if we haven't done so already. */
|
||
if (isymbuf == NULL && symtab_hdr->sh_info != 0)
|
||
{
|
||
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 == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
/* Get the value of the symbol referred to by the reloc. */
|
||
if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
|
||
{
|
||
/* A local symbol. */
|
||
Elf_Internal_Sym *isym;
|
||
asection *sym_sec;
|
||
|
||
isym = isymbuf + ELF32_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;
|
||
struct elf_link_hash_entry *h;
|
||
|
||
/* An external symbol. */
|
||
indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
|
||
h = elf_sym_hashes (abfd)[indx];
|
||
BFD_ASSERT (h != NULL);
|
||
|
||
if (h->root.type != bfd_link_hash_defined
|
||
&& h->root.type != bfd_link_hash_defweak)
|
||
/* This appears to be a reference to an undefined
|
||
symbol. Just ignore it--it will be caught by the
|
||
regular reloc processing. */
|
||
continue;
|
||
|
||
symval = (h->root.u.def.value
|
||
+ h->root.u.def.section->output_section->vma
|
||
+ h->root.u.def.section->output_offset);
|
||
}
|
||
|
||
/* For simplicity of coding, we are going to modify the section
|
||
contents, the section relocs, and the BFD symbol table. We
|
||
must tell the rest of the code not to free up this
|
||
information. It would be possible to instead create a table
|
||
of changes which have to be made, as is done in coff-mips.c;
|
||
that would be more work, but would require less memory when
|
||
the linker is run. */
|
||
|
||
/* Check if we can remove an LDI instruction from the LDI32
|
||
pseudo instruction if the upper 16 operand bits are zero. */
|
||
if (ELF32_R_TYPE (irel->r_info) == (int) R_PRU_LDI32)
|
||
{
|
||
bfd_vma value = symval + irel->r_addend;
|
||
|
||
if (debug_relax)
|
||
printf ("R_PRU_LDI32 with value=0x%lx\n", (long) value);
|
||
|
||
if ((long) value >> 16 == 0)
|
||
{
|
||
unsigned long insn;
|
||
|
||
/* Note that we've changed the relocs, section contents. */
|
||
elf_section_data (sec)->relocs = internal_relocs;
|
||
elf_section_data (sec)->this_hdr.contents = contents;
|
||
symtab_hdr->contents = (unsigned char *) isymbuf;
|
||
|
||
/* Make the second instruction load the 16-bit constant
|
||
into the full 32-bit register. */
|
||
insn = bfd_get_32 (abfd, contents + irel->r_offset + 4);
|
||
|
||
/* Old GAS and LD versions have a bug, where the two
|
||
LDI instructions are swapped. Detect such object
|
||
files and bail. */
|
||
if (GET_INSN_FIELD (RDSEL, insn) != RSEL_15_0)
|
||
{
|
||
/* xgettext:c-format */
|
||
_bfd_error_handler (_("error: %pB: old incompatible object file detected"),
|
||
abfd);
|
||
goto error_return;
|
||
}
|
||
|
||
SET_INSN_FIELD (RDSEL, insn, RSEL_31_0);
|
||
bfd_put_32 (abfd, insn, contents + irel->r_offset + 4);
|
||
|
||
/* Delete the first LDI instruction. Note that there should
|
||
be no relocations or symbols pointing to the second LDI
|
||
instruction. */
|
||
if (!pru_elf_relax_delete_bytes (abfd, sec, irel->r_offset, 4))
|
||
goto error_return;
|
||
|
||
/* We're done with deletion of the first instruction.
|
||
Set a regular LDI relocation for the second instruction
|
||
we left to load the 16-bit value into the 32-bit
|
||
register. */
|
||
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
|
||
R_PRU_U16);
|
||
|
||
/* That will change things, so, we should relax again.
|
||
Note that this is not required, and it may be slow. */
|
||
*again = TRUE;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
|
||
{
|
||
if (!link_info->keep_memory)
|
||
free (isymbuf);
|
||
else
|
||
{
|
||
/* Cache the symbols for elf_link_input_bfd. */
|
||
symtab_hdr->contents = (unsigned char *) isymbuf;
|
||
}
|
||
}
|
||
|
||
if (contents != NULL
|
||
&& elf_section_data (sec)->this_hdr.contents != contents)
|
||
{
|
||
if (!link_info->keep_memory)
|
||
free (contents);
|
||
else
|
||
{
|
||
/* Cache the section contents for elf_link_input_bfd. */
|
||
elf_section_data (sec)->this_hdr.contents = contents;
|
||
}
|
||
}
|
||
|
||
if (elf_section_data (sec)->relocs != internal_relocs)
|
||
free (internal_relocs);
|
||
|
||
return TRUE;
|
||
|
||
error_return:
|
||
if (symtab_hdr->contents != (unsigned char *) isymbuf)
|
||
free (isymbuf);
|
||
if (elf_section_data (sec)->this_hdr.contents != contents)
|
||
free (contents);
|
||
if (elf_section_data (sec)->relocs != internal_relocs)
|
||
free (internal_relocs);
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
/* Free the derived linker hash table. */
|
||
static void
|
||
pru_elf32_link_hash_table_free (bfd *obfd)
|
||
{
|
||
_bfd_elf_link_hash_table_free (obfd);
|
||
}
|
||
|
||
/* Implement bfd_elf32_bfd_link_hash_table_create. */
|
||
static struct bfd_link_hash_table *
|
||
pru_elf32_link_hash_table_create (bfd *abfd)
|
||
{
|
||
struct elf_link_hash_table *ret;
|
||
size_t amt = sizeof (struct elf_link_hash_table);
|
||
|
||
ret = bfd_zmalloc (amt);
|
||
if (ret == NULL)
|
||
return NULL;
|
||
|
||
if (!_bfd_elf_link_hash_table_init (ret, abfd,
|
||
link_hash_newfunc,
|
||
sizeof (struct
|
||
elf_link_hash_entry),
|
||
PRU_ELF_DATA))
|
||
{
|
||
free (ret);
|
||
return NULL;
|
||
}
|
||
|
||
ret->root.hash_table_free = pru_elf32_link_hash_table_free;
|
||
|
||
return &ret->root;
|
||
}
|
||
|
||
#define ELF_ARCH bfd_arch_pru
|
||
#define ELF_TARGET_ID PRU_ELF_DATA
|
||
#define ELF_MACHINE_CODE EM_TI_PRU
|
||
|
||
#define ELF_MAXPAGESIZE 1
|
||
|
||
#define bfd_elf32_bfd_link_hash_table_create \
|
||
pru_elf32_link_hash_table_create
|
||
|
||
/* Relocation table lookup macros. */
|
||
|
||
#define bfd_elf32_bfd_reloc_type_lookup pru_elf32_bfd_reloc_type_lookup
|
||
#define bfd_elf32_bfd_reloc_name_lookup pru_elf32_bfd_reloc_name_lookup
|
||
|
||
#define elf_info_to_howto pru_elf32_info_to_howto
|
||
#define elf_info_to_howto_rel NULL
|
||
|
||
/* elf backend functions. */
|
||
|
||
/* TI folks like to use a mix of REL and RELA relocations. See also
|
||
the MSP430 and TI C6X backends. */
|
||
#define elf_backend_may_use_rel_p 1
|
||
#define elf_backend_may_use_rela_p 1
|
||
#define elf_backend_default_use_rela_p 1
|
||
|
||
#define elf_backend_rela_normal 1
|
||
|
||
#define elf_backend_relocate_section pru_elf32_relocate_section
|
||
#define bfd_elf32_bfd_relax_section pru_elf32_relax_section
|
||
|
||
#define TARGET_LITTLE_SYM pru_elf32_vec
|
||
#define TARGET_LITTLE_NAME "elf32-pru"
|
||
|
||
#include "elf32-target.h"
|