469 lines
14 KiB
C
469 lines
14 KiB
C
/* BFD backend for MIPS BSD (a.out) binaries.
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Copyright (C) 1993, 94, 95, 97, 1998 Free Software Foundation, Inc.
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Written by Ralph Campbell.
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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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#define BYTES_IN_WORD 4
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/* #define ENTRY_CAN_BE_ZERO */
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#define N_HEADER_IN_TEXT(x) 1
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#define N_SHARED_LIB(x) 0
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#define N_TXTADDR(x) \
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(N_MAGIC(x) != ZMAGIC ? (x).a_entry : /* object file or NMAGIC */\
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TEXT_START_ADDR + EXEC_BYTES_SIZE /* no padding */\
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)
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#define N_DATADDR(x) (N_TXTADDR(x)+N_TXTSIZE(x))
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#define TEXT_START_ADDR 4096
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#define TARGET_PAGE_SIZE 4096
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#define SEGMENT_SIZE TARGET_PAGE_SIZE
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#define DEFAULT_ARCH bfd_arch_mips
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#define MACHTYPE_OK(mtype) ((mtype) == M_UNKNOWN \
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|| (mtype) == M_MIPS1 || (mtype) == M_MIPS2)
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#define MY_symbol_leading_char '\0'
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#define MY(OP) CAT(mipsbsd_,OP)
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#include "bfd.h"
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#include "sysdep.h"
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#include "libbfd.h"
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#include "libaout.h"
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#define SET_ARCH_MACH(ABFD, EXEC) \
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MY(set_arch_mach)(ABFD, N_MACHTYPE (EXEC)); \
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MY(choose_reloc_size)(ABFD);
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void MY(set_arch_mach) PARAMS ((bfd *abfd, int machtype));
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static void MY(choose_reloc_size) PARAMS ((bfd *abfd));
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#define MY_write_object_contents MY(write_object_contents)
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static boolean MY(write_object_contents) PARAMS ((bfd *abfd));
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/* We can't use MY(x) here because it leads to a recursive call to CAT
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when expanded inside JUMP_TABLE. */
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#define MY_bfd_reloc_type_lookup mipsbsd_reloc_howto_type_lookup
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#define MY_canonicalize_reloc mipsbsd_canonicalize_reloc
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#define MY_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
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#define MY_bfd_link_add_symbols _bfd_generic_link_add_symbols
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#define MY_final_link_callback unused
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#define MY_bfd_final_link _bfd_generic_final_link
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#define MY_backend_data &MY(backend_data)
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#define MY_BFD_TARGET
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#include "aout-target.h"
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void
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MY(set_arch_mach) (abfd, machtype)
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bfd *abfd;
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int machtype;
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{
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enum bfd_architecture arch;
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long machine;
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/* Determine the architecture and machine type of the object file. */
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switch (machtype) {
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case M_MIPS1:
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arch = bfd_arch_mips;
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machine = 3000;
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break;
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case M_MIPS2:
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arch = bfd_arch_mips;
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machine = 4000;
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break;
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default:
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arch = bfd_arch_obscure;
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machine = 0;
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break;
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}
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bfd_set_arch_mach(abfd, arch, machine);
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}
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/* Determine the size of a relocation entry, based on the architecture */
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static void
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MY(choose_reloc_size) (abfd)
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bfd *abfd;
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{
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switch (bfd_get_arch(abfd)) {
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case bfd_arch_sparc:
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case bfd_arch_a29k:
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case bfd_arch_mips:
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obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;
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break;
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default:
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obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;
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break;
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}
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}
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/* Write an object file in BSD a.out format.
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Section contents have already been written. We write the
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file header, symbols, and relocation. */
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static boolean
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MY(write_object_contents) (abfd)
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bfd *abfd;
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{
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struct external_exec exec_bytes;
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struct internal_exec *execp = exec_hdr (abfd);
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/* Magic number, maestro, please! */
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switch (bfd_get_arch(abfd)) {
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case bfd_arch_m68k:
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switch (bfd_get_mach(abfd)) {
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case bfd_mach_m68010:
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N_SET_MACHTYPE(*execp, M_68010);
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break;
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default:
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case bfd_mach_m68020:
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N_SET_MACHTYPE(*execp, M_68020);
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break;
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}
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break;
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case bfd_arch_sparc:
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N_SET_MACHTYPE(*execp, M_SPARC);
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break;
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case bfd_arch_i386:
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N_SET_MACHTYPE(*execp, M_386);
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break;
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case bfd_arch_a29k:
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N_SET_MACHTYPE(*execp, M_29K);
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break;
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case bfd_arch_mips:
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switch (bfd_get_mach(abfd)) {
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case 4000:
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case 6000:
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N_SET_MACHTYPE(*execp, M_MIPS2);
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break;
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default:
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N_SET_MACHTYPE(*execp, M_MIPS1);
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break;
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}
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break;
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default:
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N_SET_MACHTYPE(*execp, M_UNKNOWN);
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}
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MY(choose_reloc_size)(abfd);
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WRITE_HEADERS(abfd, execp);
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return true;
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}
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/*
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* MIPS relocation types.
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*/
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#define MIPS_RELOC_32 0
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#define MIPS_RELOC_JMP 1
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#define MIPS_RELOC_WDISP16 2
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#define MIPS_RELOC_HI16 3
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#define MIPS_RELOC_HI16_S 4
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#define MIPS_RELOC_LO16 5
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/*
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* This is only called when performing a BFD_RELOC_MIPS_JMP relocation.
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* The jump destination address is formed from the upper 4 bits of the
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* "current" program counter concatenated with the jump instruction's
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* 26 bit field and two trailing zeros.
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* If the destination address is not in the same segment as the "current"
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* program counter, then we need to signal an error.
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*/
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static bfd_reloc_status_type
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mips_fix_jmp_addr (abfd,reloc_entry,symbol,data,input_section,output_bfd)
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bfd *abfd;
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arelent *reloc_entry;
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struct symbol_cache_entry *symbol;
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PTR data;
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asection *input_section;
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bfd *output_bfd;
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{
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bfd_vma relocation, pc;
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/* If this is a partial relocation, just continue. */
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if (output_bfd != (bfd *)NULL)
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return bfd_reloc_continue;
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/* If this is an undefined symbol, return error */
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if (bfd_is_und_section (symbol->section)
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&& (symbol->flags & BSF_WEAK) == 0)
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return bfd_reloc_undefined;
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/*
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* Work out which section the relocation is targetted at and the
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* initial relocation command value.
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*/
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if (bfd_is_com_section (symbol->section))
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relocation = 0;
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else
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relocation = symbol->value;
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relocation += symbol->section->output_section->vma;
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relocation += symbol->section->output_offset;
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relocation += reloc_entry->addend;
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pc = input_section->output_section->vma + input_section->output_offset +
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reloc_entry->address + 4;
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if ((relocation & 0xF0000000) != (pc & 0xF0000000))
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return bfd_reloc_overflow;
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return bfd_reloc_continue;
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}
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/*
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* This is only called when performing a BFD_RELOC_HI16_S relocation.
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* We need to see if bit 15 is set in the result. If it is, we add
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* 0x10000 and continue normally. This will compensate for the sign extension
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* when the low bits are added at run time.
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*/
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static bfd_reloc_status_type
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mips_fix_hi16_s PARAMS ((bfd *, arelent *, asymbol *, PTR,
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asection *, bfd *, char **));
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static bfd_reloc_status_type
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mips_fix_hi16_s (abfd, reloc_entry, symbol, data, input_section,
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output_bfd, error_message)
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bfd *abfd;
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arelent *reloc_entry;
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asymbol *symbol;
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PTR data;
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asection *input_section;
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bfd *output_bfd;
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char **error_message;
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{
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bfd_vma relocation;
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/* If this is a partial relocation, just continue. */
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if (output_bfd != (bfd *)NULL)
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return bfd_reloc_continue;
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/* If this is an undefined symbol, return error */
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if (bfd_is_und_section (symbol->section)
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&& (symbol->flags & BSF_WEAK) == 0)
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return bfd_reloc_undefined;
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/*
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* Work out which section the relocation is targetted at and the
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* initial relocation command value.
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*/
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if (bfd_is_com_section (symbol->section))
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relocation = 0;
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else
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relocation = symbol->value;
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relocation += symbol->section->output_section->vma;
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relocation += symbol->section->output_offset;
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relocation += reloc_entry->addend;
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if (relocation & 0x8000)
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reloc_entry->addend += 0x10000;
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return bfd_reloc_continue;
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}
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static reloc_howto_type mips_howto_table_ext[] = {
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{MIPS_RELOC_32, 0, 2, 32, false, 0, complain_overflow_bitfield, 0,
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"32", false, 0, 0xffffffff, false},
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{MIPS_RELOC_JMP, 2, 2, 26, false, 0, complain_overflow_dont,
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mips_fix_jmp_addr,
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"MIPS_JMP", false, 0, 0x03ffffff, false},
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{MIPS_RELOC_WDISP16, 2, 2, 16, true, 0, complain_overflow_signed, 0,
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"WDISP16", false, 0, 0x0000ffff, false},
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{MIPS_RELOC_HI16, 16, 2, 16, false, 0, complain_overflow_bitfield, 0,
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"HI16", false, 0, 0x0000ffff, false},
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{MIPS_RELOC_HI16_S, 16, 2, 16, false, 0, complain_overflow_bitfield,
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mips_fix_hi16_s,
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"HI16_S", false, 0, 0x0000ffff, false},
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{MIPS_RELOC_LO16, 0, 2, 16, false, 0, complain_overflow_dont, 0,
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"LO16", false, 0, 0x0000ffff, false},
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};
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static reloc_howto_type *
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MY(reloc_howto_type_lookup) (abfd, code)
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bfd *abfd;
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bfd_reloc_code_real_type code;
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{
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if (bfd_get_arch (abfd) != bfd_arch_mips)
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return 0;
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switch (code)
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{
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case BFD_RELOC_CTOR:
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case BFD_RELOC_32:
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return (&mips_howto_table_ext[MIPS_RELOC_32]);
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case BFD_RELOC_MIPS_JMP:
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return (&mips_howto_table_ext[MIPS_RELOC_JMP]);
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case BFD_RELOC_16_PCREL_S2:
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return (&mips_howto_table_ext[MIPS_RELOC_WDISP16]);
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case BFD_RELOC_HI16:
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return (&mips_howto_table_ext[MIPS_RELOC_HI16]);
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case BFD_RELOC_HI16_S:
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return (&mips_howto_table_ext[MIPS_RELOC_HI16_S]);
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case BFD_RELOC_LO16:
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return (&mips_howto_table_ext[MIPS_RELOC_LO16]);
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default:
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return 0;
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}
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}
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/*
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* This is just like the standard aoutx.h version but we need to do our
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* own mapping of external reloc type values to howto entries.
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*/
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long
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MY(canonicalize_reloc)(abfd, section, relptr, symbols)
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bfd *abfd;
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sec_ptr section;
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arelent **relptr;
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asymbol **symbols;
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{
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arelent *tblptr = section->relocation;
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unsigned int count, c;
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extern reloc_howto_type NAME(aout,ext_howto_table)[];
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/* If we have already read in the relocation table, return the values. */
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if (section->flags & SEC_CONSTRUCTOR) {
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arelent_chain *chain = section->constructor_chain;
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for (count = 0; count < section->reloc_count; count++) {
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*relptr++ = &chain->relent;
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chain = chain->next;
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}
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*relptr = 0;
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return section->reloc_count;
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}
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if (tblptr && section->reloc_count) {
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for (count = 0; count++ < section->reloc_count;)
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*relptr++ = tblptr++;
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*relptr = 0;
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return section->reloc_count;
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}
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if (!NAME(aout,slurp_reloc_table)(abfd, section, symbols))
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return -1;
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tblptr = section->relocation;
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/* fix up howto entries */
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for (count = 0; count++ < section->reloc_count;)
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{
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c = tblptr->howto - NAME(aout,ext_howto_table);
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tblptr->howto = &mips_howto_table_ext[c];
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*relptr++ = tblptr++;
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}
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*relptr = 0;
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return section->reloc_count;
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}
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static CONST struct aout_backend_data MY(backend_data) = {
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0, /* zmagic contiguous */
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1, /* text incl header */
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0, /* entry is text address */
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0, /* exec_hdr_flags */
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TARGET_PAGE_SIZE, /* text vma */
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MY_set_sizes,
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0, /* text size includes exec header */
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0, /* add_dynamic_symbols */
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0, /* add_one_symbol */
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0, /* link_dynamic_object */
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0, /* write_dynamic_symbol */
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0, /* check_dynamic_reloc */
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0 /* finish_dynamic_link */
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};
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const bfd_target aout_mips_little_vec =
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{
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"a.out-mips-little", /* name */
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bfd_target_aout_flavour,
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BFD_ENDIAN_LITTLE, /* target byte order (little) */
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BFD_ENDIAN_LITTLE, /* target headers byte order (little) */
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(HAS_RELOC | EXEC_P | /* object flags */
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HAS_LINENO | HAS_DEBUG |
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HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
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(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
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MY_symbol_leading_char,
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' ', /* ar_pad_char */
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15, /* ar_max_namelen */
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bfd_getl64, bfd_getl_signed_64, bfd_putl64,
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bfd_getl32, bfd_getl_signed_32, bfd_putl32,
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bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
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bfd_getl64, bfd_getl_signed_64, bfd_putl64,
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bfd_getl32, bfd_getl_signed_32, bfd_putl32,
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bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
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{_bfd_dummy_target, MY_object_p, /* bfd_check_format */
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bfd_generic_archive_p, MY_core_file_p},
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{bfd_false, MY_mkobject, /* bfd_set_format */
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_bfd_generic_mkarchive, bfd_false},
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{bfd_false, MY_write_object_contents, /* bfd_write_contents */
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_bfd_write_archive_contents, bfd_false},
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BFD_JUMP_TABLE_GENERIC (MY),
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BFD_JUMP_TABLE_COPY (MY),
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BFD_JUMP_TABLE_CORE (MY),
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BFD_JUMP_TABLE_ARCHIVE (MY),
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BFD_JUMP_TABLE_SYMBOLS (MY),
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BFD_JUMP_TABLE_RELOCS (MY),
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BFD_JUMP_TABLE_WRITE (MY),
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BFD_JUMP_TABLE_LINK (MY),
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BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
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(PTR) MY_backend_data,
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};
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const bfd_target aout_mips_big_vec =
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{
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"a.out-mips-big", /* name */
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bfd_target_aout_flavour,
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BFD_ENDIAN_BIG, /* target byte order (big) */
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BFD_ENDIAN_BIG, /* target headers byte order (big) */
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(HAS_RELOC | EXEC_P | /* object flags */
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HAS_LINENO | HAS_DEBUG |
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HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
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(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
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MY_symbol_leading_char,
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' ', /* ar_pad_char */
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15, /* ar_max_namelen */
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bfd_getb64, bfd_getb_signed_64, bfd_putb64,
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bfd_getb32, bfd_getb_signed_32, bfd_putb32,
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bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
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bfd_getb64, bfd_getb_signed_64, bfd_putb64,
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bfd_getb32, bfd_getb_signed_32, bfd_putb32,
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bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
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{_bfd_dummy_target, MY_object_p, /* bfd_check_format */
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bfd_generic_archive_p, MY_core_file_p},
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{bfd_false, MY_mkobject, /* bfd_set_format */
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_bfd_generic_mkarchive, bfd_false},
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{bfd_false, MY_write_object_contents, /* bfd_write_contents */
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_bfd_write_archive_contents, bfd_false},
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BFD_JUMP_TABLE_GENERIC (MY),
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BFD_JUMP_TABLE_COPY (MY),
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BFD_JUMP_TABLE_CORE (MY),
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BFD_JUMP_TABLE_ARCHIVE (MY),
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BFD_JUMP_TABLE_SYMBOLS (MY),
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BFD_JUMP_TABLE_RELOCS (MY),
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BFD_JUMP_TABLE_WRITE (MY),
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BFD_JUMP_TABLE_LINK (MY),
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BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
|
|
|
|
(PTR) MY_backend_data,
|
|
};
|