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Diffstat (limited to 'bfd/nlm32-i386.c')
| -rw-r--r-- | bfd/nlm32-i386.c | 429 |
1 files changed, 0 insertions, 429 deletions
diff --git a/bfd/nlm32-i386.c b/bfd/nlm32-i386.c deleted file mode 100644 index b8de2b8..0000000 --- a/bfd/nlm32-i386.c +++ /dev/null @@ -1,429 +0,0 @@ -/* Support for 32-bit i386 NLM (NetWare Loadable Module) - Copyright (C) 1993-2018 Free Software Foundation, Inc. - - 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. */ - -#include "sysdep.h" -#include "bfd.h" -#include "libbfd.h" - -#define ARCH_SIZE 32 - -#include "nlm/i386-ext.h" -#define Nlm_External_Fixed_Header Nlm32_i386_External_Fixed_Header - -#include "libnlm.h" - -/* Adjust the reloc location by an absolute value. */ - -static reloc_howto_type nlm_i386_abs_howto = - HOWTO (0, /* Type. */ - 0, /* Rightshift. */ - 2, /* Size (0 = byte, 1 = short, 2 = long). */ - 32, /* Bitsize. */ - FALSE, /* PC relative. */ - 0, /* Bitpos. */ - complain_overflow_bitfield, /* Complain_on_overflow. */ - 0, /* Special_function. */ - "32", /* Name. */ - TRUE, /* Partial_inplace. */ - 0xffffffff, /* Source mask. */ - 0xffffffff, /* Dest mask. */ - FALSE); /* PR rel_offset. */ - -/* Adjust the reloc location by a PC relative displacement. */ - -static reloc_howto_type nlm_i386_pcrel_howto = - HOWTO (1, /* Type. */ - 0, /* Rightshift. */ - 2, /* Size (0 = byte, 1 = short, 2 = long). */ - 32, /* Bitsize. */ - TRUE, /* PC relative. */ - 0, /* Bitpos. */ - complain_overflow_signed, /* Complain_on_overflow. */ - 0, /* Special_function. */ - "DISP32", /* Name. */ - TRUE, /* Partial_inplace. */ - 0xffffffff, /* Source mask. */ - 0xffffffff, /* Dest mask. */ - TRUE); /* PR rel_offset. */ - -/* Read a NetWare i386 reloc. */ - -static bfd_boolean -nlm_i386_read_reloc (bfd *abfd, - nlmNAME (symbol_type) *sym, - asection **secp, - arelent *rel) -{ - bfd_byte temp[4]; - bfd_vma val; - const char *name; - - if (bfd_bread (temp, (bfd_size_type) sizeof (temp), abfd) != sizeof (temp)) - return FALSE; - - val = bfd_get_32 (abfd, temp); - - /* The value is an offset into either the code or data segment. - This is the location which needs to be adjusted. - - If this is a relocation fixup rather than an imported symbol (the - sym argument is NULL) then the high bit is 0 if the location - needs to be adjusted by the address of the data segment, or 1 if - the location needs to be adjusted by the address of the code - segment. If this is an imported symbol, then the high bit is 0 - if the location is 0 if the location should be adjusted by the - offset to the symbol, or 1 if the location should adjusted by the - absolute value of the symbol. - - The second most significant bit is 0 if the value is an offset - into the data segment, or 1 if the value is an offset into the - code segment. - - All this translates fairly easily into a BFD reloc. */ - - if (sym == NULL) - { - if ((val & NLM_HIBIT) == 0) - name = NLM_INITIALIZED_DATA_NAME; - else - { - name = NLM_CODE_NAME; - val &=~ NLM_HIBIT; - } - rel->sym_ptr_ptr = bfd_get_section_by_name (abfd, name)->symbol_ptr_ptr; - rel->howto = &nlm_i386_abs_howto; - } - else - { - /* In this case we do not need to set the sym_ptr_ptr field. */ - rel->sym_ptr_ptr = NULL; - if ((val & NLM_HIBIT) == 0) - rel->howto = &nlm_i386_pcrel_howto; - else - { - rel->howto = &nlm_i386_abs_howto; - val &=~ NLM_HIBIT; - } - } - - if ((val & (NLM_HIBIT >> 1)) == 0) - *secp = bfd_get_section_by_name (abfd, NLM_INITIALIZED_DATA_NAME); - else - { - *secp = bfd_get_section_by_name (abfd, NLM_CODE_NAME); - val &=~ (NLM_HIBIT >> 1); - } - - rel->address = val; - rel->addend = 0; - - return TRUE; -} - -/* Write a NetWare i386 reloc. */ - -static bfd_boolean -nlm_i386_write_import (bfd * abfd, asection * sec, arelent * rel) -{ - asymbol *sym; - bfd_vma val; - bfd_byte temp[4]; - - /* NetWare only supports two kinds of relocs. We should check - special_function here, as well, but at the moment coff-i386 - relocs uses a special_function which does not affect what we do - here. */ - if (rel->addend != 0 - || rel->howto == NULL - || rel->howto->rightshift != 0 - || rel->howto->size != 2 - || rel->howto->bitsize != 32 - || rel->howto->bitpos != 0 - || rel->howto->src_mask != 0xffffffff - || rel->howto->dst_mask != 0xffffffff) - { - bfd_set_error (bfd_error_invalid_operation); - return FALSE; - } - - sym = *rel->sym_ptr_ptr; - - /* The value we write out is the offset into the appropriate - segment. This offset is the section vma, adjusted by the vma of - the lowest section in that segment, plus the address of the - relocation. */ - val = bfd_get_section_vma (abfd, sec) + rel->address; - - /* The second most significant bit is 0 if the value is an offset - into the data segment, or 1 if the value is an offset into the - code segment. */ - if (bfd_get_section_flags (abfd, sec) & SEC_CODE) - { - val -= nlm_get_text_low (abfd); - val |= NLM_HIBIT >> 1; - } - else - val -= nlm_get_data_low (abfd); - - if (! bfd_is_und_section (bfd_get_section (sym))) - { - /* NetWare only supports absolute internal relocs. */ - if (rel->howto->pc_relative) - { - bfd_set_error (bfd_error_invalid_operation); - return FALSE; - } - - /* The high bit is 1 if the reloc is against the code section, 0 - if against the data section. */ - if (bfd_get_section_flags (abfd, bfd_get_section (sym)) & SEC_CODE) - val |= NLM_HIBIT; - } - else - { - /* The high bit is 1 if this is an absolute reloc, 0 if it is PC - relative. */ - if (! rel->howto->pc_relative) - val |= NLM_HIBIT; - else - { - /* PC relative relocs on NetWare must be pcrel_offset. */ - if (! rel->howto->pcrel_offset) - { - bfd_set_error (bfd_error_invalid_operation); - return FALSE; - } - } - } - - bfd_put_32 (abfd, val, temp); - if (bfd_bwrite (temp, (bfd_size_type) sizeof (temp), abfd) != sizeof (temp)) - return FALSE; - - return TRUE; -} - -/* I want to be able to use objcopy to turn an i386 a.out or COFF file - into a NetWare i386 module. That means that the relocs from the - source file have to be mapped into relocs that apply to the target - file. This function is called by nlm_set_section_contents to give - it a chance to rework the relocs. - - This is actually a fairly general concept. However, this is not a - general implementation. */ - -static bfd_boolean -nlm_i386_mangle_relocs (bfd *abfd, - asection *sec, - const void * data, - bfd_vma offset, - bfd_size_type count) -{ - arelent **rel_ptr_ptr, **rel_end; - - rel_ptr_ptr = sec->orelocation; - rel_end = rel_ptr_ptr + sec->reloc_count; - for (; rel_ptr_ptr < rel_end; rel_ptr_ptr++) - { - arelent *rel; - asymbol *sym; - bfd_vma addend; - - rel = *rel_ptr_ptr; - sym = *rel->sym_ptr_ptr; - - /* Note that no serious harm will ensue if we fail to change a - reloc. We will wind up failing in nlm_i386_write_import. */ - - /* Make sure this reloc is within the data we have. We only 4 - byte relocs here, so we insist on having 4 bytes. */ - if (rel->address < offset - || rel->address + 4 > offset + count) - continue; - - /* NetWare doesn't support reloc addends, so we get rid of them - here by simply adding them into the object data. We handle - the symbol value, if any, the same way. */ - addend = rel->addend + sym->value; - - /* The value of a symbol is the offset into the section. If the - symbol is in the .bss segment, we need to include the size of - the data segment in the offset as well. Fortunately, we know - that at this point the size of the data section is in the NLM - header. */ - if (((bfd_get_section_flags (abfd, bfd_get_section (sym)) - & SEC_LOAD) == 0) - && ((bfd_get_section_flags (abfd, bfd_get_section (sym)) - & SEC_ALLOC) != 0)) - addend += nlm_fixed_header (abfd)->dataImageSize; - - if (addend != 0 - && rel->howto != NULL - && rel->howto->rightshift == 0 - && rel->howto->size == 2 - && rel->howto->bitsize == 32 - && rel->howto->bitpos == 0 - && rel->howto->src_mask == 0xffffffff - && rel->howto->dst_mask == 0xffffffff) - { - bfd_vma val; - - val = bfd_get_32 (abfd, (bfd_byte *) data + rel->address - offset); - val += addend; - bfd_put_32 (abfd, val, (bfd_byte *) data + rel->address - offset); - rel->addend = 0; - } - - /* NetWare uses a reloc with pcrel_offset set. We adjust - pc_relative relocs accordingly. We are going to change the - howto field, so we can only do this if the current one is - compatible. We should check special_function here, but at - the moment coff-i386 uses a special_function which does not - affect what we are doing here. */ - if (rel->howto != NULL - && rel->howto->pc_relative - && ! rel->howto->pcrel_offset - && rel->howto->rightshift == 0 - && rel->howto->size == 2 - && rel->howto->bitsize == 32 - && rel->howto->bitpos == 0 - && rel->howto->src_mask == 0xffffffff - && rel->howto->dst_mask == 0xffffffff) - { - bfd_vma val; - - /* When pcrel_offset is not set, it means that the negative - of the address of the memory location is stored in the - memory location. We must add it back in. */ - val = bfd_get_32 (abfd, (bfd_byte *) data + rel->address - offset); - val += rel->address; - bfd_put_32 (abfd, val, (bfd_byte *) data + rel->address - offset); - - rel->howto = &nlm_i386_pcrel_howto; - } - } - - return TRUE; -} - -/* Read a NetWare i386 import record. */ - -static bfd_boolean -nlm_i386_read_import (bfd * abfd, nlmNAME (symbol_type) * sym) -{ - struct nlm_relent *nlm_relocs; /* Relocation records for symbol. */ - bfd_size_type rcount; /* Number of relocs. */ - bfd_byte temp[NLM_TARGET_LONG_SIZE]; /* Temporary 32-bit value. */ - unsigned char symlength; /* Length of symbol name. */ - char *name; - - if (bfd_bread (& symlength, (bfd_size_type) sizeof (symlength), abfd) - != sizeof (symlength)) - return FALSE; - sym -> symbol.the_bfd = abfd; - name = bfd_alloc (abfd, (bfd_size_type) symlength + 1); - if (name == NULL) - return FALSE; - if (bfd_bread (name, (bfd_size_type) symlength, abfd) != symlength) - return FALSE; - name[symlength] = '\0'; - sym -> symbol.name = name; - sym -> symbol.flags = 0; - sym -> symbol.value = 0; - sym -> symbol.section = bfd_und_section_ptr; - if (bfd_bread (temp, (bfd_size_type) sizeof (temp), abfd) != sizeof (temp)) - return FALSE; - rcount = H_GET_32 (abfd, temp); - nlm_relocs = bfd_alloc (abfd, rcount * sizeof (struct nlm_relent)); - if (!nlm_relocs) - return FALSE; - sym -> relocs = nlm_relocs; - sym -> rcnt = 0; - while (sym -> rcnt < rcount) - { - asection *section; - - if (! nlm_i386_read_reloc (abfd, sym, §ion, &nlm_relocs -> reloc)) - return FALSE; - nlm_relocs -> section = section; - nlm_relocs++; - sym -> rcnt++; - } - return TRUE; -} - -/* Write out an external reference. */ - -static bfd_boolean -nlm_i386_write_external (bfd *abfd, - bfd_size_type count, - asymbol *sym, - struct reloc_and_sec *relocs) -{ - unsigned int i; - bfd_byte len; - unsigned char temp[NLM_TARGET_LONG_SIZE]; - - len = strlen (sym->name); - if ((bfd_bwrite (&len, (bfd_size_type) sizeof (bfd_byte), abfd) - != sizeof (bfd_byte)) - || bfd_bwrite (sym->name, (bfd_size_type) len, abfd) != len) - return FALSE; - - bfd_put_32 (abfd, count, temp); - if (bfd_bwrite (temp, (bfd_size_type) sizeof (temp), abfd) != sizeof (temp)) - return FALSE; - - for (i = 0; i < count; i++) - if (! nlm_i386_write_import (abfd, relocs[i].sec, relocs[i].rel)) - return FALSE; - - return TRUE; -} - -#include "nlmswap.h" - -static const struct nlm_backend_data nlm32_i386_backend = -{ - "NetWare Loadable Module\032", - sizeof (Nlm32_i386_External_Fixed_Header), - 0, /* Optional_prefix_size. */ - bfd_arch_i386, - 0, - FALSE, - 0, /* Backend_object_p. */ - 0, /* Write_prefix_func. */ - nlm_i386_read_reloc, - nlm_i386_mangle_relocs, - nlm_i386_read_import, - nlm_i386_write_import, - 0, /* Set_public_section. */ - 0, /* Set_public_offset. */ - nlm_swap_fixed_header_in, - nlm_swap_fixed_header_out, - nlm_i386_write_external, - 0, /* Write_export. */ -}; - -#define TARGET_LITTLE_NAME "nlm32-i386" -#define TARGET_LITTLE_SYM i386_nlm32_vec -#define TARGET_BACKEND_DATA & nlm32_i386_backend - -#include "nlm-target.h" |