367 lines
12 KiB
C
367 lines
12 KiB
C
/* BFD back-end for ns32k a.out-ish binaries.
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Copyright (C) 1990-2022 Free Software Foundation, Inc.
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Contributed by Ian Dall (idall@eleceng.adelaide.edu.au).
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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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#include "sysdep.h"
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#include "bfd.h"
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#include "libbfd.h"
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#include "aout/aout64.h"
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#include "ns32k.h"
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/* Do not "beautify" the CONCAT* macro args. Traditional C will not
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remove whitespace added here, and thus will fail to concatenate
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the tokens. */
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#define MYNS(OP) CONCAT2 (ns32k_aout_,OP)
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reloc_howto_type * MYNS (bfd_reloc_type_lookup) (bfd *, bfd_reloc_code_real_type);
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reloc_howto_type * MYNS (bfd_reloc_name_lookup) (bfd *, const char *);
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bool MYNS (write_object_contents) (bfd *);
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/* Avoid multiple definitions from aoutx if supporting
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standard a.out format(s) as well as this one. */
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#define NAME(x,y) CONCAT3 (ns32kaout,_32_,y)
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void bfd_ns32k_arch (void);
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#include "libaout.h"
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#define MY(OP) MYNS (OP)
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#define MY_swap_std_reloc_in MY (swap_std_reloc_in)
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#define MY_swap_std_reloc_out MY (swap_std_reloc_out)
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/* The ns32k series is ah, unusual, when it comes to relocation.
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There are three storage methods for relocatable objects. There
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are displacements, immediate operands and ordinary twos complement
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data. Of these, only the last fits into the standard relocation
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scheme. Immediate operands are stored huffman encoded and
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immediate operands are stored big endian (where as the natural byte
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order is little endian for this architecture).
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Note that the ns32k displacement storage method is orthogonal to
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whether the relocation is pc relative or not. The "displacement"
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storage scheme is used for essentially all address constants. The
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displacement can be relative to zero (absolute displacement),
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relative to the pc (pc relative), the stack pointer, the frame
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pointer, the static base register and general purpose register etc.
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For example:
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sym1: .long . # pc relative 2's complement
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sym1: .long foo # 2's complement not pc relative
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self: movd @self, r0 # pc relative displacement
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movd foo, r0 # non pc relative displacement
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self: movd self, r0 # pc relative immediate
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movd foo, r0 # non pc relative immediate
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In addition, for historical reasons the encoding of the relocation types
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in the a.out format relocation entries is such that even the relocation
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methods which are standard are not encoded the standard way. */
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reloc_howto_type MY (howto_table)[] =
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{
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/* ns32k immediate operands. */
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HOWTO (BFD_RELOC_NS32K_IMM_8, 0, 1, 8, false, 0, complain_overflow_signed,
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_bfd_ns32k_reloc_imm, "NS32K_IMM_8",
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true, 0x000000ff,0x000000ff, false),
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HOWTO (BFD_RELOC_NS32K_IMM_16, 0, 2, 16, false, 0, complain_overflow_signed,
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_bfd_ns32k_reloc_imm, "NS32K_IMM_16",
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true, 0x0000ffff,0x0000ffff, false),
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HOWTO (BFD_RELOC_NS32K_IMM_32, 0, 4, 32, false, 0, complain_overflow_signed,
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_bfd_ns32k_reloc_imm, "NS32K_IMM_32",
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true, 0xffffffff,0xffffffff, false),
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HOWTO (BFD_RELOC_NS32K_IMM_8_PCREL, 0, 1, 8, true, 0, complain_overflow_signed,
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_bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_8",
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true, 0x000000ff, 0x000000ff, false),
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HOWTO (BFD_RELOC_NS32K_IMM_16_PCREL, 0, 2, 16, true, 0, complain_overflow_signed,
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_bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_16",
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true, 0x0000ffff,0x0000ffff, false),
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HOWTO (BFD_RELOC_NS32K_IMM_32_PCREL, 0, 4, 32, true, 0, complain_overflow_signed,
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_bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_32",
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true, 0xffffffff,0xffffffff, false),
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/* ns32k displacements. */
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HOWTO (BFD_RELOC_NS32K_DISP_8, 0, 1, 7, false, 0, complain_overflow_signed,
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_bfd_ns32k_reloc_disp, "NS32K_DISP_8",
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true, 0x000000ff,0x000000ff, false),
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HOWTO (BFD_RELOC_NS32K_DISP_16, 0, 2, 14, false, 0, complain_overflow_signed,
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_bfd_ns32k_reloc_disp, "NS32K_DISP_16",
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true, 0x0000ffff, 0x0000ffff, false),
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HOWTO (BFD_RELOC_NS32K_DISP_32, 0, 4, 30, false, 0, complain_overflow_signed,
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_bfd_ns32k_reloc_disp, "NS32K_DISP_32",
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true, 0xffffffff, 0xffffffff, false),
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HOWTO (BFD_RELOC_NS32K_DISP_8_PCREL, 0, 1, 7, true, 0, complain_overflow_signed,
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_bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_8",
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true, 0x000000ff,0x000000ff, false),
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HOWTO (BFD_RELOC_NS32K_DISP_16_PCREL, 0, 2, 14, true, 0, complain_overflow_signed,
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_bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_16",
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true, 0x0000ffff,0x0000ffff, false),
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HOWTO (BFD_RELOC_NS32K_DISP_32_PCREL, 0, 4, 30, true, 0, complain_overflow_signed,
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_bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_32",
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true, 0xffffffff,0xffffffff, false),
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/* Normal 2's complement. */
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HOWTO (BFD_RELOC_8, 0, 1, 8, false, 0, complain_overflow_bitfield,0,
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"8", true, 0x000000ff,0x000000ff, false),
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HOWTO (BFD_RELOC_16, 0, 2, 16, false, 0, complain_overflow_bitfield,0,
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"16", true, 0x0000ffff,0x0000ffff, false),
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HOWTO (BFD_RELOC_32, 0, 4, 32, false, 0, complain_overflow_bitfield,0,
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"32", true, 0xffffffff,0xffffffff, false),
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HOWTO (BFD_RELOC_8_PCREL, 0, 1, 8, true, 0, complain_overflow_signed, 0,
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"PCREL_8", true, 0x000000ff,0x000000ff, false),
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HOWTO (BFD_RELOC_16_PCREL, 0, 2, 16, true, 0, complain_overflow_signed, 0,
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"PCREL_16", true, 0x0000ffff,0x0000ffff, false),
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HOWTO (BFD_RELOC_32_PCREL, 0, 4, 32, true, 0, complain_overflow_signed, 0,
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"PCREL_32", true, 0xffffffff,0xffffffff, false),
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};
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#define CTOR_TABLE_RELOC_HOWTO(BFD) (MY (howto_table) + 14)
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#define RELOC_STD_BITS_NS32K_TYPE_BIG 0x06
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#define RELOC_STD_BITS_NS32K_TYPE_LITTLE 0x60
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#define RELOC_STD_BITS_NS32K_TYPE_SH_BIG 1
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#define RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE 5
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static reloc_howto_type *
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MY (reloc_howto) (bfd *abfd ATTRIBUTE_UNUSED,
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struct reloc_std_external *rel,
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unsigned int *r_index,
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int *r_extern,
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int *r_pcrel)
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{
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unsigned int r_length;
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unsigned int r_ns32k_type;
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*r_index = ((rel->r_index[2] << 16)
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| (rel->r_index[1] << 8)
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| rel->r_index[0] );
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*r_extern = (0 != (rel->r_type[0] & RELOC_STD_BITS_EXTERN_LITTLE));
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*r_pcrel = (0 != (rel->r_type[0] & RELOC_STD_BITS_PCREL_LITTLE));
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r_length = ((rel->r_type[0] & RELOC_STD_BITS_LENGTH_LITTLE)
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>> RELOC_STD_BITS_LENGTH_SH_LITTLE);
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r_ns32k_type = ((rel->r_type[0] & RELOC_STD_BITS_NS32K_TYPE_LITTLE)
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>> RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE);
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if (r_length > 2 || r_ns32k_type > 2)
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return NULL;
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return (MY (howto_table) + r_length + 3 * (*r_pcrel) + 6 * r_ns32k_type);
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}
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#define MY_reloc_howto(BFD, REL, IN, EX, PC) \
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MY (reloc_howto) (BFD, REL, &IN, &EX, &PC)
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static void
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MY (put_reloc) (bfd *abfd,
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int r_extern,
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int r_index,
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bfd_vma value,
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reloc_howto_type *howto,
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struct reloc_std_external *reloc)
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{
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unsigned int r_length;
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int r_pcrel;
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int r_ns32k_type;
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PUT_WORD (abfd, value, reloc->r_address);
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r_length = bfd_log2 (bfd_get_reloc_size (howto));
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r_pcrel = (int) howto->pc_relative; /* Relative to PC? */
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r_ns32k_type = (howto - MY (howto_table) )/6;
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reloc->r_index[2] = r_index >> 16;
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reloc->r_index[1] = r_index >> 8;
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reloc->r_index[0] = r_index;
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reloc->r_type[0] =
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(r_extern? RELOC_STD_BITS_EXTERN_LITTLE: 0)
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| (r_pcrel? RELOC_STD_BITS_PCREL_LITTLE: 0)
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| (r_length << RELOC_STD_BITS_LENGTH_SH_LITTLE)
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| (r_ns32k_type << RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE);
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}
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#define MY_put_reloc(BFD, EXT, IDX, VAL, HOWTO, RELOC) \
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MY (put_reloc) (BFD, EXT, IDX, VAL, HOWTO, RELOC)
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#define STAT_FOR_EXEC
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#define MY_final_link_relocate _bfd_ns32k_final_link_relocate
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#define MY_relocate_contents _bfd_ns32k_relocate_contents
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static void MY_swap_std_reloc_in (bfd *, struct reloc_std_external *, arelent *, asymbol **, bfd_size_type);
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static void MY_swap_std_reloc_out (bfd *, arelent *, struct reloc_std_external *);
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#include "aoutx.h"
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reloc_howto_type *
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MY (bfd_reloc_type_lookup) (bfd *abfd, bfd_reloc_code_real_type code)
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{
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#define ENTRY(i,j) case i: return &MY (howto_table)[j]
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int ext = obj_reloc_entry_size (abfd) == RELOC_EXT_SIZE;
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BFD_ASSERT (ext == 0);
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if (code == BFD_RELOC_CTOR)
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switch (bfd_arch_bits_per_address (abfd))
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{
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case 32:
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code = BFD_RELOC_32;
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break;
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default:
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break;
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}
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switch (code)
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{
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ENTRY (BFD_RELOC_NS32K_IMM_8, 0);
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ENTRY (BFD_RELOC_NS32K_IMM_16, 1);
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ENTRY (BFD_RELOC_NS32K_IMM_32, 2);
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ENTRY (BFD_RELOC_NS32K_IMM_8_PCREL, 3);
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ENTRY (BFD_RELOC_NS32K_IMM_16_PCREL, 4);
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ENTRY (BFD_RELOC_NS32K_IMM_32_PCREL, 5);
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ENTRY (BFD_RELOC_NS32K_DISP_8, 6);
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ENTRY (BFD_RELOC_NS32K_DISP_16, 7);
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ENTRY (BFD_RELOC_NS32K_DISP_32, 8);
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ENTRY (BFD_RELOC_NS32K_DISP_8_PCREL, 9);
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ENTRY (BFD_RELOC_NS32K_DISP_16_PCREL, 10);
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ENTRY (BFD_RELOC_NS32K_DISP_32_PCREL, 11);
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ENTRY (BFD_RELOC_8, 12);
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ENTRY (BFD_RELOC_16, 13);
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ENTRY (BFD_RELOC_32, 14);
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ENTRY (BFD_RELOC_8_PCREL, 15);
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ENTRY (BFD_RELOC_16_PCREL, 16);
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ENTRY (BFD_RELOC_32_PCREL, 17);
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default:
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return NULL;
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}
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#undef ENTRY
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}
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reloc_howto_type *
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MY (bfd_reloc_name_lookup) (bfd *abfd ATTRIBUTE_UNUSED,
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const char *r_name)
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{
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unsigned int i;
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for (i = 0;
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i < sizeof (MY (howto_table)) / sizeof (MY (howto_table)[0]);
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i++)
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if (MY (howto_table)[i].name != NULL
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&& strcasecmp (MY (howto_table)[i].name, r_name) == 0)
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return &MY (howto_table)[i];
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return NULL;
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}
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static void
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MY_swap_std_reloc_in (bfd *abfd,
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struct reloc_std_external *bytes,
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arelent *cache_ptr,
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asymbol **symbols,
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bfd_size_type symcount ATTRIBUTE_UNUSED)
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{
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unsigned int r_index;
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int r_extern;
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int r_pcrel;
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struct aoutdata *su = &(abfd->tdata.aout_data->a);
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cache_ptr->address = H_GET_32 (abfd, bytes->r_address);
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/* Now the fun stuff. */
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cache_ptr->howto = MY_reloc_howto (abfd, bytes, r_index, r_extern, r_pcrel);
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MOVE_ADDRESS (0);
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}
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static void
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MY_swap_std_reloc_out (bfd *abfd,
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arelent *g,
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struct reloc_std_external *natptr)
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{
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int r_index;
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asymbol *sym = *(g->sym_ptr_ptr);
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int r_extern;
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asection *output_section = sym->section->output_section;
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/* Name was clobbered by aout_write_syms to be symbol index. */
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/* If this relocation is relative to a symbol then set the
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r_index to the symbols index, and the r_extern bit.
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Absolute symbols can come in in two ways, either as an offset
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from the abs section, or as a symbol which has an abs value.
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Check for that here. */
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if (bfd_is_com_section (output_section)
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|| bfd_is_abs_section (output_section)
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|| bfd_is_und_section (output_section))
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{
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if (bfd_abs_section_ptr->symbol == sym)
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{
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/* Whoops, looked like an abs symbol, but is really an offset
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from the abs section. */
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r_index = 0;
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r_extern = 0;
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}
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else
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{
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/* Fill in symbol. */
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r_extern = 1;
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#undef KEEPIT
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#define KEEPIT udata.i
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r_index = (*(g->sym_ptr_ptr))->KEEPIT;
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#undef KEEPIT
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}
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}
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else
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{
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/* Just an ordinary section. */
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r_extern = 0;
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r_index = output_section->target_index;
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}
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MY_put_reloc (abfd, r_extern, r_index, g->address, g->howto, natptr);
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}
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bfd_reloc_status_type
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_bfd_ns32k_relocate_contents (reloc_howto_type *howto,
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bfd *input_bfd,
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bfd_vma relocation,
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bfd_byte *location)
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{
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int r_ns32k_type = (howto - MY (howto_table)) / 6;
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bfd_vma (*get_data) (bfd_byte *, int);
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void (*put_data) (bfd_vma, bfd_byte *, int);
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switch (r_ns32k_type)
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{
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case 0:
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get_data = _bfd_ns32k_get_immediate;
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put_data = _bfd_ns32k_put_immediate;
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break;
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case 1:
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get_data = _bfd_ns32k_get_displacement;
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put_data = _bfd_ns32k_put_displacement;
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break;
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case 2:
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return _bfd_relocate_contents (howto, input_bfd, relocation,
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location);
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default:
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return bfd_reloc_notsupported;
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}
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return _bfd_do_ns32k_reloc_contents (howto, input_bfd, relocation,
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location, get_data, put_data);
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}
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