diff options
Diffstat (limited to 'binutils-2.25/bfd/mipsbsd.c')
| -rw-r--r-- | binutils-2.25/bfd/mipsbsd.c | 486 |
1 files changed, 486 insertions, 0 deletions
diff --git a/binutils-2.25/bfd/mipsbsd.c b/binutils-2.25/bfd/mipsbsd.c new file mode 100644 index 00000000..202c23fb --- /dev/null +++ b/binutils-2.25/bfd/mipsbsd.c @@ -0,0 +1,486 @@ +/* BFD backend for MIPS BSD (a.out) binaries. + Copyright 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003, + 2005, 2007, 2009, 2011, 2012 Free Software Foundation, Inc. + Written by Ralph Campbell. + + This file is part of BFD, the Binary File Descriptor library. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, + MA 02110-1301, USA. */ + + +/* #define ENTRY_CAN_BE_ZERO */ +#define N_HEADER_IN_TEXT(x) 1 +#define N_TXTADDR(x) \ + (N_MAGIC(x) != ZMAGIC ? (x).a_entry : /* object file or NMAGIC */\ + TEXT_START_ADDR + EXEC_BYTES_SIZE /* no padding */\ + ) +#define N_DATADDR(x) (N_TXTADDR(x)+N_TXTSIZE(x)) +#define TEXT_START_ADDR 4096 +#define TARGET_PAGE_SIZE 4096 +#define SEGMENT_SIZE TARGET_PAGE_SIZE +#define DEFAULT_ARCH bfd_arch_mips +#define MACHTYPE_OK(mtype) ((mtype) == M_UNKNOWN \ + || (mtype) == M_MIPS1 || (mtype) == M_MIPS2) +#define MY_symbol_leading_char '\0' + +/* Do not "beautify" the CONCAT* macro args. Traditional C will not + remove whitespace added here, and thus will fail to concatenate + the tokens. */ +#define MY(OP) CONCAT2 (mipsbsd_,OP) + +#include "sysdep.h" +#include "bfd.h" +#include "libbfd.h" +#include "libaout.h" + +#define SET_ARCH_MACH(ABFD, EXEC) \ + MY(set_arch_mach) (ABFD, N_MACHTYPE (EXEC)); \ + MY(choose_reloc_size) (ABFD); +static void MY(set_arch_mach) (bfd *, unsigned long); +static void MY(choose_reloc_size) (bfd *); + +#define MY_write_object_contents MY(write_object_contents) +static bfd_boolean MY(write_object_contents) (bfd *); + +/* We can't use MY(x) here because it leads to a recursive call to CONCAT2 + when expanded inside JUMP_TABLE. */ +#define MY_bfd_reloc_type_lookup mipsbsd_reloc_type_lookup +#define MY_bfd_reloc_name_lookup mipsbsd_reloc_name_lookup +#define MY_canonicalize_reloc mipsbsd_canonicalize_reloc + +#define MY_bfd_link_hash_table_create _bfd_generic_link_hash_table_create +#define MY_bfd_link_add_symbols _bfd_generic_link_add_symbols +#define MY_final_link_callback unused +#define MY_bfd_final_link _bfd_generic_final_link + +#define MY_backend_data &MY(backend_data) +#define MY_BFD_TARGET + +#include "aout-target.h" + +static bfd_reloc_status_type mips_fix_jmp_addr + (bfd *, arelent *, struct bfd_symbol *, void *, asection *, + bfd *, char **); + +long MY(canonicalize_reloc) (bfd *, sec_ptr, arelent **, asymbol **); + +static void +MY(set_arch_mach) (bfd *abfd, unsigned long machtype) +{ + enum bfd_architecture arch; + unsigned int machine; + + /* Determine the architecture and machine type of the object file. */ + switch (machtype) + { + case M_MIPS1: + arch = bfd_arch_mips; + machine = bfd_mach_mips3000; + break; + + case M_MIPS2: + arch = bfd_arch_mips; + machine = bfd_mach_mips4000; + break; + + default: + arch = bfd_arch_obscure; + machine = 0; + break; + } + + bfd_set_arch_mach (abfd, arch, machine); +} + +/* Determine the size of a relocation entry, based on the architecture */ +static void +MY (choose_reloc_size) (bfd *abfd) +{ + switch (bfd_get_arch (abfd)) + { + case bfd_arch_sparc: + case bfd_arch_mips: + obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE; + break; + default: + obj_reloc_entry_size (abfd) = RELOC_STD_SIZE; + break; + } +} + +/* Write an object file in BSD a.out format. + Section contents have already been written. We write the + file header, symbols, and relocation. */ + +static bfd_boolean +MY (write_object_contents) (bfd *abfd) +{ + struct external_exec exec_bytes; + struct internal_exec *execp = exec_hdr (abfd); + + /* Magic number, maestro, please! */ + switch (bfd_get_arch (abfd)) + { + case bfd_arch_m68k: + switch (bfd_get_mach (abfd)) + { + case bfd_mach_m68010: + N_SET_MACHTYPE (*execp, M_68010); + break; + default: + case bfd_mach_m68020: + N_SET_MACHTYPE (*execp, M_68020); + break; + } + break; + case bfd_arch_sparc: + N_SET_MACHTYPE (*execp, M_SPARC); + break; + case bfd_arch_i386: + N_SET_MACHTYPE (*execp, M_386); + break; + case bfd_arch_mips: + switch (bfd_get_mach (abfd)) + { + case bfd_mach_mips4000: + case bfd_mach_mips6000: + N_SET_MACHTYPE (*execp, M_MIPS2); + break; + default: + N_SET_MACHTYPE (*execp, M_MIPS1); + break; + } + break; + default: + N_SET_MACHTYPE (*execp, M_UNKNOWN); + } + + MY (choose_reloc_size) (abfd); + + WRITE_HEADERS (abfd, execp); + + return TRUE; +} + +/* MIPS relocation types. */ +#define MIPS_RELOC_32 0 +#define MIPS_RELOC_JMP 1 +#define MIPS_RELOC_WDISP16 2 +#define MIPS_RELOC_HI16 3 +#define MIPS_RELOC_HI16_S 4 +#define MIPS_RELOC_LO16 5 + +/* This is only called when performing a BFD_RELOC_MIPS_JMP relocation. + The jump destination address is formed from the upper 4 bits of the + "current" program counter concatenated with the jump instruction's + 26 bit field and two trailing zeros. + If the destination address is not in the same segment as the "current" + program counter, then we need to signal an error. */ + +static bfd_reloc_status_type +mips_fix_jmp_addr (bfd *abfd ATTRIBUTE_UNUSED, + arelent *reloc_entry, + struct bfd_symbol *symbol, + void * data ATTRIBUTE_UNUSED, + asection *input_section, + bfd *output_bfd, + char **error_message ATTRIBUTE_UNUSED) +{ + bfd_vma relocation, pc; + + /* If this is a partial relocation, just continue. */ + if (output_bfd != (bfd *) NULL) + return bfd_reloc_continue; + + /* If this is an undefined symbol, return error */ + if (bfd_is_und_section (symbol->section) + && (symbol->flags & BSF_WEAK) == 0) + return bfd_reloc_undefined; + + /* Work out which section the relocation is targeted at and the + initial relocation command value. */ + if (bfd_is_com_section (symbol->section)) + relocation = 0; + else + relocation = symbol->value; + + relocation += symbol->section->output_section->vma; + relocation += symbol->section->output_offset; + relocation += reloc_entry->addend; + + pc = input_section->output_section->vma + input_section->output_offset + + reloc_entry->address + 4; + + if ((relocation & 0xF0000000) != (pc & 0xF0000000)) + return bfd_reloc_overflow; + + return bfd_reloc_continue; +} + +/* This is only called when performing a BFD_RELOC_HI16_S relocation. + We need to see if bit 15 is set in the result. If it is, we add + 0x10000 and continue normally. This will compensate for the sign extension + when the low bits are added at run time. */ + +static bfd_reloc_status_type +mips_fix_hi16_s (bfd *abfd ATTRIBUTE_UNUSED, + arelent *reloc_entry, + asymbol *symbol, + void * data ATTRIBUTE_UNUSED, + asection *input_section ATTRIBUTE_UNUSED, + bfd *output_bfd, + char **error_message ATTRIBUTE_UNUSED) +{ + bfd_vma relocation; + + /* If this is a partial relocation, just continue. */ + if (output_bfd != (bfd *)NULL) + return bfd_reloc_continue; + + /* If this is an undefined symbol, return error. */ + if (bfd_is_und_section (symbol->section) + && (symbol->flags & BSF_WEAK) == 0) + return bfd_reloc_undefined; + + /* Work out which section the relocation is targeted at and the + initial relocation command value. */ + if (bfd_is_com_section (symbol->section)) + relocation = 0; + else + relocation = symbol->value; + + relocation += symbol->section->output_section->vma; + relocation += symbol->section->output_offset; + relocation += reloc_entry->addend; + + if (relocation & 0x8000) + reloc_entry->addend += 0x10000; + + return bfd_reloc_continue; +} + +static reloc_howto_type mips_howto_table_ext[] = +{ + {MIPS_RELOC_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 0, + "32", FALSE, 0, 0xffffffff, FALSE}, + {MIPS_RELOC_JMP, 2, 2, 26, FALSE, 0, complain_overflow_dont, + mips_fix_jmp_addr, + "MIPS_JMP", FALSE, 0, 0x03ffffff, FALSE}, + {MIPS_RELOC_WDISP16, 2, 2, 16, TRUE, 0, complain_overflow_signed, 0, + "WDISP16", FALSE, 0, 0x0000ffff, FALSE}, + {MIPS_RELOC_HI16, 16, 2, 16, FALSE, 0, complain_overflow_bitfield, 0, + "HI16", FALSE, 0, 0x0000ffff, FALSE}, + {MIPS_RELOC_HI16_S, 16, 2, 16, FALSE, 0, complain_overflow_bitfield, + mips_fix_hi16_s, + "HI16_S", FALSE, 0, 0x0000ffff, FALSE}, + {MIPS_RELOC_LO16, 0, 2, 16, FALSE, 0, complain_overflow_dont, 0, + "LO16", FALSE, 0, 0x0000ffff, FALSE}, +}; + +static reloc_howto_type * +MY(reloc_type_lookup) (bfd *abfd, bfd_reloc_code_real_type code) +{ + if (bfd_get_arch (abfd) != bfd_arch_mips) + return NULL; + + switch (code) + { + case BFD_RELOC_CTOR: + case BFD_RELOC_32: + return (&mips_howto_table_ext[MIPS_RELOC_32]); + case BFD_RELOC_MIPS_JMP: + return (&mips_howto_table_ext[MIPS_RELOC_JMP]); + case BFD_RELOC_16_PCREL_S2: + return (&mips_howto_table_ext[MIPS_RELOC_WDISP16]); + case BFD_RELOC_HI16: + return (&mips_howto_table_ext[MIPS_RELOC_HI16]); + case BFD_RELOC_HI16_S: + return (&mips_howto_table_ext[MIPS_RELOC_HI16_S]); + case BFD_RELOC_LO16: + return (&mips_howto_table_ext[MIPS_RELOC_LO16]); + default: + return NULL; + } +} + +static reloc_howto_type * +MY(reloc_name_lookup) (bfd *abfd ATTRIBUTE_UNUSED, + const char *r_name) +{ + unsigned int i; + + for (i = 0; + i < sizeof (mips_howto_table_ext) / sizeof (mips_howto_table_ext[0]); + i++) + if (mips_howto_table_ext[i].name != NULL + && strcasecmp (mips_howto_table_ext[i].name, r_name) == 0) + return &mips_howto_table_ext[i]; + + return NULL; +} + +/* This is just like the standard aoutx.h version but we need to do our + own mapping of external reloc type values to howto entries. */ +long +MY(canonicalize_reloc) (bfd *abfd, + sec_ptr section, + arelent **relptr, + asymbol **symbols) +{ + arelent *tblptr = section->relocation; + unsigned int count, c; + extern reloc_howto_type NAME(aout,ext_howto_table)[]; + + /* If we have already read in the relocation table, return the values. */ + if (section->flags & SEC_CONSTRUCTOR) + { + arelent_chain *chain = section->constructor_chain; + + for (count = 0; count < section->reloc_count; count++) + { + *relptr++ = &chain->relent; + chain = chain->next; + } + *relptr = 0; + return section->reloc_count; + } + + if (tblptr && section->reloc_count) + { + for (count = 0; count++ < section->reloc_count;) + *relptr++ = tblptr++; + *relptr = 0; + return section->reloc_count; + } + + if (!NAME(aout,slurp_reloc_table) (abfd, section, symbols)) + return -1; + tblptr = section->relocation; + + /* fix up howto entries. */ + for (count = 0; count++ < section->reloc_count;) + { + c = tblptr->howto - NAME(aout,ext_howto_table); + tblptr->howto = &mips_howto_table_ext[c]; + + *relptr++ = tblptr++; + } + *relptr = 0; + return section->reloc_count; +} + +static const struct aout_backend_data MY(backend_data) = +{ + 0, /* zmagic contiguous */ + 1, /* text incl header */ + 0, /* entry is text address */ + 0, /* exec_hdr_flags */ + TARGET_PAGE_SIZE, /* text vma */ + MY_set_sizes, + 0, /* text size includes exec header */ + 0, /* add_dynamic_symbols */ + 0, /* add_one_symbol */ + 0, /* link_dynamic_object */ + 0, /* write_dynamic_symbol */ + 0, /* check_dynamic_reloc */ + 0 /* finish_dynamic_link */ +}; + +extern const bfd_target aout_mips_big_vec; + +const bfd_target aout_mips_little_vec = +{ + "a.out-mips-little", /* name */ + bfd_target_aout_flavour, + BFD_ENDIAN_LITTLE, /* target byte order (little) */ + BFD_ENDIAN_LITTLE, /* target headers byte order (little) */ + (HAS_RELOC | EXEC_P | /* object flags */ + HAS_LINENO | HAS_DEBUG | + HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), + (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA), + MY_symbol_leading_char, + ' ', /* ar_pad_char */ + 15, /* ar_max_namelen */ + 0, /* match priority. */ + bfd_getl64, bfd_getl_signed_64, bfd_putl64, + bfd_getl32, bfd_getl_signed_32, bfd_putl32, + bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */ + bfd_getl64, bfd_getl_signed_64, bfd_putl64, + bfd_getl32, bfd_getl_signed_32, bfd_putl32, + bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */ + {_bfd_dummy_target, MY_object_p, /* bfd_check_format */ + bfd_generic_archive_p, MY_core_file_p}, + {bfd_false, MY_mkobject, /* bfd_set_format */ + _bfd_generic_mkarchive, bfd_false}, + {bfd_false, MY_write_object_contents, /* bfd_write_contents */ + _bfd_write_archive_contents, bfd_false}, + + BFD_JUMP_TABLE_GENERIC (MY), + BFD_JUMP_TABLE_COPY (MY), + BFD_JUMP_TABLE_CORE (MY), + BFD_JUMP_TABLE_ARCHIVE (MY), + BFD_JUMP_TABLE_SYMBOLS (MY), + BFD_JUMP_TABLE_RELOCS (MY), + BFD_JUMP_TABLE_WRITE (MY), + BFD_JUMP_TABLE_LINK (MY), + BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), + + & aout_mips_big_vec, + + MY_backend_data + }; + +const bfd_target aout_mips_big_vec = + { + "a.out-mips-big", /* name */ + bfd_target_aout_flavour, + BFD_ENDIAN_BIG, /* target byte order (big) */ + BFD_ENDIAN_BIG, /* target headers byte order (big) */ + (HAS_RELOC | EXEC_P | /* object flags */ + HAS_LINENO | HAS_DEBUG | + HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), + (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA), + MY_symbol_leading_char, + ' ', /* ar_pad_char */ + 15, /* ar_max_namelen */ + 0, /* match priority. */ + bfd_getb64, bfd_getb_signed_64, bfd_putb64, + bfd_getb32, bfd_getb_signed_32, bfd_putb32, + bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */ + bfd_getb64, bfd_getb_signed_64, bfd_putb64, + bfd_getb32, bfd_getb_signed_32, bfd_putb32, + bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */ + {_bfd_dummy_target, MY_object_p, /* bfd_check_format */ + bfd_generic_archive_p, MY_core_file_p}, + {bfd_false, MY_mkobject, /* bfd_set_format */ + _bfd_generic_mkarchive, bfd_false}, + {bfd_false, MY_write_object_contents, /* bfd_write_contents */ + _bfd_write_archive_contents, bfd_false}, + + BFD_JUMP_TABLE_GENERIC (MY), + BFD_JUMP_TABLE_COPY (MY), + BFD_JUMP_TABLE_CORE (MY), + BFD_JUMP_TABLE_ARCHIVE (MY), + BFD_JUMP_TABLE_SYMBOLS (MY), + BFD_JUMP_TABLE_RELOCS (MY), + BFD_JUMP_TABLE_WRITE (MY), + BFD_JUMP_TABLE_LINK (MY), + BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), + + & aout_mips_little_vec, + + MY_backend_data + }; 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