home *** CD-ROM | disk | FTP | other *** search
- /* BFD back-end for ns32k a.out-ish binaries.
- Copyright (C) 1990, 91, 92, 94, 95, 1996 Free Software Foundation, Inc.
- Contributed by Ian Dall (idall@eleceng.adelaide.edu.au).
-
- This file is part of BFD, the Binary File Descriptor library.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-
- #define BYTES_IN_WORD 4
-
- #include "bfd.h"
- #include "aout/aout64.h"
- #include "ns32k.h"
-
- #define MYNS(OP) CAT(ns32kaout_,OP)
- reloc_howto_type *
- MYNS(bfd_reloc_type_lookup)
- PARAMS((bfd *abfd AND
- bfd_reloc_code_real_type code));
-
- boolean
- MYNS(write_object_contents)
- PARAMS((bfd *abfd));
-
- /* Avoid multiple definitions from aoutx if supporting standard a.out format(s)
- * as well as this one
- */
- #define NAME(x,y) CAT3(ns32kaout,_32_,y)
-
- void bfd_ns32k_arch PARAMS ((void));
-
- #include "libaout.h"
-
- #define MY(OP) MYNS(OP)
-
- #define MY_swap_std_reloc_in MY(swap_std_reloc_in)
- #define MY_swap_std_reloc_out MY(swap_std_reloc_out)
-
- static void
- MY_swap_std_reloc_in PARAMS ((bfd *abfd, struct reloc_std_external *bytes,
- arelent *cache_ptr, asymbol **symbols,
- bfd_size_type symcount));
-
- static void
- MY_swap_std_reloc_out PARAMS ((bfd *abfd, arelent *g,
- struct reloc_std_external *natptr));
-
- /* The ns32k series is ah, unusual, when it comes to relocation.
- * There are three storage methods for relocateable objects. There
- * are displacements, immediate operands and ordinary twos complement
- * data. Of these, only the last fits into the standard relocation
- * scheme. Immediate operands are stored huffman encoded and
- * immediate operands are stored big endian (where as the natural byte
- * order is little endian for this achitecture).
-
- * Note that the ns32k displacement storage method is orthogonal to
- * whether the relocation is pc relative or not. The "displacement"
- * storage scheme is used for essentially all address constants. The
- * displacement can be relative to zero (absolute displacement),
- * relative to the pc (pc relative), the stack pointer, the frame
- * pointer, the static base register and general purpose register etc.
-
- * For example:
- *
- * sym1: .long . # pc relative 2's complement
- * sym1: .long foo # 2's complement not pc relative
- *
- * self: movd @self, r0 # pc relative displacement
- * movd foo, r0 # non pc relative displacement
- *
- * self: movd self, r0 # pc relative immediate
- * movd foo, r0 # non pc relative immediate
- *
- * In addition, for historical reasons the encoding of the relocation types
- * in the a.out format relocation entries is such that even the relocation
- * methods which are standard are not encoded the standard way.
- *
- */
-
- reloc_howto_type MY(howto_table)[] =
- {
- /* ns32k immediate operands */
- HOWTO (BFD_RELOC_NS32K_IMM_8, 0, 0, 8, false, 0, true,
- _bfd_ns32k_reloc_imm, "NS32K_IMM_8",
- true, 0x000000ff,0x000000ff, false),
- HOWTO (BFD_RELOC_NS32K_IMM_16, 0, 1, 16, false, 0, true,
- _bfd_ns32k_reloc_imm, "NS32K_IMM_16",
- true, 0x0000ffff,0x0000ffff, false),
- HOWTO (BFD_RELOC_NS32K_IMM_32, 0, 2, 32, false, 0, true,
- _bfd_ns32k_reloc_imm, "NS32K_IMM_32",
- true, 0xffffffff,0xffffffff, false),
- HOWTO (BFD_RELOC_NS32K_IMM_8_PCREL, 0, 0, 8, true, 0, false,
- _bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_8",
- true, 0x000000ff, 0x000000ff, false),
- HOWTO (BFD_RELOC_NS32K_IMM_16_PCREL, 0, 1, 16, true, 0, false,
- _bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_16",
- true, 0x0000ffff,0x0000ffff, false),
- HOWTO (BFD_RELOC_NS32K_IMM_32_PCREL, 0, 2, 32, true, 0, false,
- _bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_32",
- true, 0xffffffff,0xffffffff, false),
-
- /* ns32k displacements */
- HOWTO (BFD_RELOC_NS32K_DISP_8, 0, 0, 8, false, 0, true,
- _bfd_ns32k_reloc_disp, "NS32K_DISP_8",
- true, 0x000000ff,0x000000ff, false),
- HOWTO (BFD_RELOC_NS32K_DISP_16, 0, 1, 16, false, 0, true,
- _bfd_ns32k_reloc_disp, "NS32K_DISP_16",
- true, 0x0000ffff, 0x0000ffff, false),
- HOWTO (BFD_RELOC_NS32K_DISP_32, 0, 2, 32, false, 0, true,
- _bfd_ns32k_reloc_disp, "NS32K_DISP_32",
- true, 0xffffffff, 0xffffffff, false),
- HOWTO (BFD_RELOC_NS32K_DISP_8_PCREL, 0, 0, 8, true, 0, false,
- _bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_8",
- true, 0x000000ff,0x000000ff, false),
- HOWTO (BFD_RELOC_NS32K_DISP_16_PCREL, 0, 1, 16, true, 0, false,
- _bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_16",
- true, 0x0000ffff,0x0000ffff, false),
- HOWTO (BFD_RELOC_NS32K_DISP_32_PCREL, 0, 2, 32, true, 0, false,
- _bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_32",
- true, 0xffffffff,0xffffffff, false),
-
- /* Normal 2's complement */
- HOWTO (BFD_RELOC_8, 0, 0, 8, false, 0, complain_overflow_bitfield,0,
- "8", true, 0x000000ff,0x000000ff, false),
- HOWTO (BFD_RELOC_16, 0, 1, 16, false, 0, complain_overflow_bitfield,0,
- "16", true, 0x0000ffff,0x0000ffff, false),
- HOWTO (BFD_RELOC_32, 0, 2, 32, false, 0, complain_overflow_bitfield,0,
- "32", true, 0xffffffff,0xffffffff, false),
- HOWTO (BFD_RELOC_8_PCREL, 0, 0, 8, true, 0, complain_overflow_signed, 0,
- "PCREL_8", true, 0x000000ff,0x000000ff, false),
- HOWTO (BFD_RELOC_16_PCREL, 0, 1, 16, true, 0, complain_overflow_signed, 0,
- "PCREL_16", true, 0x0000ffff,0x0000ffff, false),
- HOWTO (BFD_RELOC_32_PCREL, 0, 2, 32, true, 0, complain_overflow_signed, 0,
- "PCREL_32", true, 0xffffffff,0xffffffff, false),
- };
-
-
- #define CTOR_TABLE_RELOC_HOWTO(BFD) (MY(howto_table) + 14)
-
- #define RELOC_STD_BITS_NS32K_TYPE_BIG 0x06
- #define RELOC_STD_BITS_NS32K_TYPE_LITTLE 0x60
- #define RELOC_STD_BITS_NS32K_TYPE_SH_BIG 1
- #define RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE 5
-
- reloc_howto_type *
- MY(reloc_howto)(abfd, rel, r_index, r_extern, r_pcrel)
- bfd *abfd;
- struct reloc_std_external *rel;
- int *r_index;
- int *r_extern;
- int *r_pcrel;
- {
- unsigned int r_length;
- int r_ns32k_type;
- /* BFD_ASSERT(bfd_header_little_endian (abfd)); */
- *r_index = ((rel->r_index[2] << 16)
- | (rel->r_index[1] << 8)
- | rel->r_index[0] );
- *r_extern = (0 != (rel->r_type[0] & RELOC_STD_BITS_EXTERN_LITTLE));
- *r_pcrel = (0 != (rel->r_type[0] & RELOC_STD_BITS_PCREL_LITTLE));
- r_length = ((rel->r_type[0] & RELOC_STD_BITS_LENGTH_LITTLE)
- >> RELOC_STD_BITS_LENGTH_SH_LITTLE);
- r_ns32k_type = ((rel->r_type[0] & RELOC_STD_BITS_NS32K_TYPE_LITTLE)
- >> RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE);
- return (MY(howto_table) + r_length + 3 * (*r_pcrel) + 6 * r_ns32k_type);
- }
-
- #define MY_reloc_howto(BFD,REL,IN,EX,PC) MY(reloc_howto)(BFD, REL, &IN, &EX, &PC)
-
- void
- MY(put_reloc)(abfd, r_extern, r_index, value, howto, reloc)
- bfd *abfd;
- int r_extern;
- int r_index;
- long value;
- reloc_howto_type *howto;
- struct reloc_std_external *reloc;
- {
- unsigned int r_length;
- int r_pcrel;
- int r_ns32k_type;
- PUT_WORD (abfd, value, reloc->r_address);
- r_length = howto->size ; /* Size as a power of two */
- r_pcrel = (int) howto->pc_relative; /* Relative to PC? */
- r_ns32k_type = (howto - MY(howto_table) )/6;
- /* BFD_ASSERT (bfd_header_little_endian (abfd)); */
- reloc->r_index[2] = r_index >> 16;
- reloc->r_index[1] = r_index >> 8;
- reloc->r_index[0] = r_index;
- reloc->r_type[0] =
- (r_extern? RELOC_STD_BITS_EXTERN_LITTLE: 0)
- | (r_pcrel? RELOC_STD_BITS_PCREL_LITTLE: 0)
- | (r_length << RELOC_STD_BITS_LENGTH_SH_LITTLE)
- | (r_ns32k_type << RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE);
- }
-
- #define MY_put_reloc(BFD, EXT, IDX, VAL, HOWTO, RELOC) \
- MY(put_reloc)(BFD, EXT, IDX, VAL, HOWTO, RELOC)
-
- #define STAT_FOR_EXEC
-
- #define MY_final_link_relocate _bfd_ns32k_final_link_relocate
- #define MY_relocate_contents _bfd_ns32k_relocate_contents
-
- #include <aoutx.h>
-
- reloc_howto_type *
- MY(bfd_reloc_type_lookup)(abfd,code)
- bfd *abfd;
- bfd_reloc_code_real_type code;
- {
-
- #define ENTRY(i,j) case i: return &MY(howto_table)[j]
-
- int ext = obj_reloc_entry_size (abfd) == RELOC_EXT_SIZE;
-
- BFD_ASSERT(ext == 0);
- if (code == BFD_RELOC_CTOR)
- switch (bfd_get_arch_info (abfd)->bits_per_address)
- {
- case 32:
- code = BFD_RELOC_32;
- break;
- }
- switch (code)
- {
- ENTRY(BFD_RELOC_NS32K_IMM_8, 0);
- ENTRY(BFD_RELOC_NS32K_IMM_16, 1);
- ENTRY(BFD_RELOC_NS32K_IMM_32, 2);
- ENTRY(BFD_RELOC_NS32K_IMM_8_PCREL, 3);
- ENTRY(BFD_RELOC_NS32K_IMM_16_PCREL, 4);
- ENTRY(BFD_RELOC_NS32K_IMM_32_PCREL, 5);
- ENTRY(BFD_RELOC_NS32K_DISP_8, 6);
- ENTRY(BFD_RELOC_NS32K_DISP_16, 7);
- ENTRY(BFD_RELOC_NS32K_DISP_32, 8);
- ENTRY(BFD_RELOC_NS32K_DISP_8_PCREL, 9);
- ENTRY(BFD_RELOC_NS32K_DISP_16_PCREL, 10);
- ENTRY(BFD_RELOC_NS32K_DISP_32_PCREL, 11);
- ENTRY(BFD_RELOC_8, 12);
- ENTRY(BFD_RELOC_16, 13);
- ENTRY(BFD_RELOC_32, 14);
- ENTRY(BFD_RELOC_8_PCREL, 15);
- ENTRY(BFD_RELOC_16_PCREL, 16);
- ENTRY(BFD_RELOC_32_PCREL, 17);
- default: return (reloc_howto_type *) NULL;
- }
- #undef ENTRY
- }
-
-
- static void
- MY_swap_std_reloc_in (abfd, bytes, cache_ptr, symbols, symcount)
- bfd *abfd;
- struct reloc_std_external *bytes;
- arelent *cache_ptr;
- asymbol **symbols;
- bfd_size_type symcount;
- {
- int r_index;
- int r_extern;
- int r_pcrel;
- struct aoutdata *su = &(abfd->tdata.aout_data->a);
-
- cache_ptr->address = bfd_h_get_32 (abfd, bytes->r_address);
-
- /* now the fun stuff */
-
- cache_ptr->howto = MY_reloc_howto(abfd, bytes, r_index, r_extern, r_pcrel);
-
- MOVE_ADDRESS(0);
- }
-
- static void
- MY_swap_std_reloc_out (abfd, g, natptr)
- bfd *abfd;
- arelent *g;
- struct reloc_std_external *natptr;
- {
- int r_index;
- asymbol *sym = *(g->sym_ptr_ptr);
- int r_extern;
- unsigned int r_addend;
- asection *output_section = sym->section->output_section;
-
- r_addend = g->addend + (*(g->sym_ptr_ptr))->section->output_section->vma;
-
- /* name was clobbered by aout_write_syms to be symbol index */
-
- /* If this relocation is relative to a symbol then set the
- r_index to the symbols index, and the r_extern bit.
-
- Absolute symbols can come in in two ways, either as an offset
- from the abs section, or as a symbol which has an abs value.
- Check for that here. */
-
- if (bfd_is_com_section (output_section)
- || output_section == &bfd_abs_section
- || output_section == &bfd_und_section)
- {
- if (bfd_abs_section.symbol == sym)
- {
- /* Whoops, looked like an abs symbol, but is really an offset
- from the abs section */
- r_index = 0;
- r_extern = 0;
- }
- else
- {
- /* Fill in symbol */
- r_extern = 1;
- #undef KEEPIT
- #define KEEPIT udata.i
- r_index = (*(g->sym_ptr_ptr))->KEEPIT;
- #undef KEEPIT
- }
- }
- else
- {
- /* Just an ordinary section */
- r_extern = 0;
- r_index = output_section->target_index;
- }
-
- MY_put_reloc (abfd, r_extern, r_index, g->address, g->howto, natptr);
- }
-
- bfd_reloc_status_type
- _bfd_ns32k_relocate_contents (howto, input_bfd, relocation, location)
- reloc_howto_type *howto;
- bfd *input_bfd;
- bfd_vma relocation;
- bfd_byte *location;
- {
- int r_ns32k_type = (howto - MY(howto_table)) / 6;
- long (*get_data)();
- int (*put_data)();
-
- switch (r_ns32k_type)
- {
- case 0:
- get_data = _bfd_ns32k_get_immediate;
- put_data = _bfd_ns32k_put_immediate;
- break;
- case 1:
- get_data = _bfd_ns32k_get_displacement;
- put_data = _bfd_ns32k_put_displacement;
- break;
- case 2:
- return _bfd_relocate_contents (howto, input_bfd, relocation,
- location);
- /* NOT REACHED */
- break;
- }
- return _bfd_do_ns32k_reloc_contents (howto, input_bfd, relocation,
- location, get_data, put_data);
- }
-