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authorRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
committerRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
commit252b5132c753830d5fd56823373aed85f2a0db63 (patch)
tree1af963bfd8d3e55167b81def4207f175eaff3a56 /bfd/nlm32-i386.c
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19990502 sourceware importbinu_ss_19990502
Diffstat (limited to 'bfd/nlm32-i386.c')
-rw-r--r--bfd/nlm32-i386.c451
1 files changed, 451 insertions, 0 deletions
diff --git a/bfd/nlm32-i386.c b/bfd/nlm32-i386.c
new file mode 100644
index 0000000..f16c74d
--- /dev/null
+++ b/bfd/nlm32-i386.c
@@ -0,0 +1,451 @@
+/* Support for 32-bit i386 NLM (NetWare Loadable Module)
+ Copyright (C) 1993 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 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. */
+
+#include "bfd.h"
+#include "sysdep.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"
+
+static boolean nlm_i386_read_reloc
+ PARAMS ((bfd *, nlmNAME(symbol_type) *, asection **, arelent *));
+static boolean nlm_i386_write_import
+ PARAMS ((bfd *, asection *, arelent *));
+static boolean nlm_i386_mangle_relocs
+ PARAMS ((bfd *, asection *, PTR, bfd_vma, bfd_size_type));
+static boolean nlm_i386_read_import
+ PARAMS ((bfd *, nlmNAME(symbol_type) *));
+static boolean nlm_i386_write_external
+ PARAMS ((bfd *, bfd_size_type, asymbol *, struct reloc_and_sec *));
+
+/* 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, /* src_mask */
+ 0xffffffff, /* dst_mask */
+ false); /* pcrel_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, /* src_mask */
+ 0xffffffff, /* dst_mask */
+ true); /* pcrel_offset */
+
+/* Read a NetWare i386 reloc. */
+
+static boolean
+nlm_i386_read_reloc (abfd, sym, secp, rel)
+ bfd *abfd;
+ nlmNAME(symbol_type) *sym;
+ asection **secp;
+ arelent *rel;
+{
+ bfd_byte temp[4];
+ bfd_vma val;
+ const char *name;
+
+ if (bfd_read (temp, sizeof (temp), 1, 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 boolean
+nlm_i386_write_import (abfd, sec, rel)
+ 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_write (temp, sizeof (temp), 1, abfd) != sizeof (temp))
+ return false;
+
+ return true;
+}
+
+/* I want to be able to use objcopy to turn a 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 boolean
+nlm_i386_mangle_relocs (abfd, sec, data, offset, count)
+ bfd *abfd;
+ asection *sec;
+ PTR 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 boolean
+nlm_i386_read_import (abfd, sym)
+ 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_read ((PTR) &symlength, sizeof (symlength), 1, abfd)
+ != sizeof (symlength))
+ return false;
+ sym -> symbol.the_bfd = abfd;
+ name = bfd_alloc (abfd, symlength + 1);
+ if (name == NULL)
+ return false;
+ if (bfd_read (name, symlength, 1, 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_read ((PTR) temp, sizeof (temp), 1, abfd) != sizeof (temp))
+ return false;
+ rcount = bfd_h_get_32 (abfd, temp);
+ nlm_relocs = ((struct nlm_relent *)
+ 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, &section,
+ &nlm_relocs -> reloc)
+ == false)
+ return false;
+ nlm_relocs -> section = section;
+ nlm_relocs++;
+ sym -> rcnt++;
+ }
+ return true;
+}
+
+/* Write out an external reference. */
+
+static boolean
+nlm_i386_write_external (abfd, count, sym, relocs)
+ 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_write (&len, sizeof (bfd_byte), 1, abfd) != sizeof(bfd_byte))
+ || bfd_write (sym->name, len, 1, abfd) != len)
+ return false;
+
+ bfd_put_32 (abfd, count, temp);
+ if (bfd_write (temp, sizeof(temp), 1, abfd) != sizeof (temp))
+ return false;
+
+ for (i = 0; i < count; i++)
+ {
+ if (nlm_i386_write_import (abfd, relocs[i].sec,
+ relocs[i].rel) == false)
+ 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, /* get_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 nlmNAME(i386_vec)
+#define TARGET_BACKEND_DATA &nlm32_i386_backend
+
+#include "nlm-target.h"