1/* BFD back-end data structures for NLM (NetWare Loadable Modules) files.
2   Copyright 1993, 1994, 2001, 2002, 2003, 2005 Free Software Foundation, Inc.
3   Written by Cygnus Support.
4
5   This file is part of BFD, the Binary File Descriptor library.
6
7   This program is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 2 of the License, or
10   (at your option) any later version.
11
12   This program is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program; if not, write to the Free Software
19   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
20
21#ifndef _LIBNLM_H_
22#define _LIBNLM_H_ 1
23
24#ifdef ARCH_SIZE
25#  define NLM_ARCH_SIZE ARCH_SIZE
26#endif
27#include "nlm/common.h"
28#include "nlm/internal.h"
29#include "nlm/external.h"
30
31/* A reloc for an imported NLM symbol.  Normal relocs are associated
32   with sections, and include a symbol.  These relocs are associated
33   with (undefined) symbols, and include a section.  */
34
35struct nlm_relent
36{
37  /* Section of reloc.  */
38  asection *section;
39  /* Reloc info (sym_ptr_ptr field set only when canonicalized).  */
40  arelent reloc;
41};
42
43/* Information we keep for an NLM symbol.  */
44
45typedef struct
46{
47  /* BFD symbol.  */
48  asymbol symbol;
49  /* Number of reloc entries for imported symbol.  */
50  bfd_size_type rcnt;
51  /* Array of reloc information for imported symbol.  */
52  struct nlm_relent *relocs;
53} nlmNAME(symbol_type);
54
55extern bfd_boolean        nlm_mkobject                    (bfd *);
56extern bfd_boolean        nlm_set_arch_mach               (bfd *, enum bfd_architecture, unsigned long);
57extern void               nlmNAME (get_symbol_info)       (bfd *, asymbol *, symbol_info *);
58extern long               nlmNAME (get_symtab_upper_bound)(bfd *);
59extern long               nlmNAME (canonicalize_symtab)   (bfd *, asymbol **);
60extern asymbol *          nlmNAME (make_empty_symbol)     (bfd *);
61extern void               nlmNAME (print_symbol)          (bfd *, void *, asymbol *, bfd_print_symbol_type);
62extern long               nlmNAME (get_reloc_upper_bound) (bfd *, asection *);
63extern long               nlmNAME (canonicalize_reloc)    (bfd *, asection *, arelent **, asymbol **);
64extern const bfd_target * nlmNAME (object_p)              (bfd *);
65extern bfd_boolean        nlmNAME (set_arch_mach)         (bfd *, enum bfd_architecture, unsigned long);
66extern bfd_boolean        nlmNAME (set_section_contents)  (bfd *, asection *, const void *, file_ptr, bfd_size_type);
67extern bfd_boolean        nlmNAME (write_object_contents) (bfd *);
68
69/* Some private data is stashed away for future use using the tdata pointer
70   in the bfd structure.  */
71
72struct nlm_obj_tdata
73{
74  /* Actual data, but ref like ptr */
75  Nlm_Internal_Fixed_Header	nlm_fixed_hdr[1];
76  Nlm_Internal_Variable_Header	nlm_variable_hdr[1];
77  Nlm_Internal_Version_Header	nlm_version_hdr[1];
78  Nlm_Internal_Copyright_Header	nlm_copyright_hdr[1];
79  Nlm_Internal_Extended_Header	nlm_extended_hdr[1];
80  Nlm_Internal_Custom_Header	nlm_custom_hdr[1];
81  Nlm_Internal_Cygnus_Ext_Header nlm_cygnus_ext_hdr[1];
82  /* BFD NLM symbols.  */
83  nlmNAME (symbol_type)	*	nlm_symbols;
84  /* Lowest text and data VMA values.  */
85  bfd_vma			nlm_text_low;
86  bfd_vma			nlm_data_low;
87  /* Caches for data read from object file.  */
88  arelent *			nlm_reloc_fixups;
89  asection **			nlm_reloc_fixup_secs;
90  /* Backend specific information.  This should probably be a pointer,
91     but that would require yet another entry point to initialize the
92     structure.  */
93  union
94    {
95      struct	/* Alpha backend information.  */
96	{
97	  bfd_vma gp;			/* GP value.  */
98	  bfd_vma lita_address;		/* .lita section address.  */
99	  bfd_size_type lita_size;	/* .lita section size.  */
100	}
101      alpha_backend_data;
102    }
103  backend_data;
104};
105
106#define nlm_tdata(bfd)			((bfd) -> tdata.nlm_obj_data)
107#define nlm_fixed_header(bfd)		(nlm_tdata (bfd) -> nlm_fixed_hdr)
108#define nlm_variable_header(bfd)	(nlm_tdata (bfd) -> nlm_variable_hdr)
109#define nlm_version_header(bfd)		(nlm_tdata (bfd) -> nlm_version_hdr)
110#define nlm_copyright_header(bfd)	(nlm_tdata (bfd) -> nlm_copyright_hdr)
111#define nlm_extended_header(bfd)	(nlm_tdata (bfd) -> nlm_extended_hdr)
112#define nlm_custom_header(bfd)		(nlm_tdata (bfd) -> nlm_custom_hdr)
113#define nlm_cygnus_ext_header(bfd)	(nlm_tdata (bfd) -> nlm_cygnus_ext_hdr)
114#define nlm_get_symbols(bfd)		(nlm_tdata (bfd) -> nlm_symbols)
115#define nlm_set_symbols(bfd, p)		(nlm_tdata (bfd) -> nlm_symbols = (p))
116#define nlm_set_text_low(bfd, i)	(nlm_tdata (bfd) -> nlm_text_low = (i))
117#define nlm_get_text_low(bfd)		(nlm_tdata (bfd) -> nlm_text_low)
118#define nlm_set_data_low(bfd, i)	(nlm_tdata (bfd) -> nlm_data_low = (i))
119#define nlm_get_data_low(bfd)		(nlm_tdata (bfd) -> nlm_data_low)
120#define nlm_relocation_fixups(bfd)	(nlm_tdata (bfd) -> nlm_reloc_fixups)
121#define nlm_relocation_fixup_secs(bfd)	(nlm_tdata (bfd) -> nlm_reloc_fixup_secs)
122#define nlm_alpha_backend_data(bfd)    (&nlm_tdata (bfd) -> backend_data.alpha_backend_data)
123
124/* This is used when writing out the external relocs. */
125
126struct reloc_and_sec
127{
128  arelent *rel;
129  asection *sec;
130};
131
132/* We store some function pointer in the backend structure.  This lets
133   different NLM targets share most of the same code, while providing
134   slightly different code where necessary.  */
135
136struct nlm_backend_data
137{
138  /* Signature for this backend.  */
139  char signature[NLM_SIGNATURE_SIZE];
140  /* Size of the fixed header.  */
141  bfd_size_type fixed_header_size;
142  /* Size of optional prefix for this backend.  Some backend may
143     require this to be a function, but so far a constant is OK.  This
144     is for a prefix which precedes the standard NLM fixed header.  */
145  bfd_size_type optional_prefix_size;
146  /* Architecture.  */
147  enum bfd_architecture arch;
148  /* Machine.  */
149  unsigned int mach;
150  /* Some NLM formats do not use the uninitialized data section, so
151     all uninitialized data must be put into the regular data section
152     instead.  */
153  bfd_boolean no_uninitialized_data;
154  /* Some NLM formats have a prefix on the file.  If this function is
155     not NULL, it will be called by nlm_object_p.  It should return
156     TRUE if this file could match this format, and it should leave
157     the BFD such that a bfd_bread will pick up the fixed header.  */
158  bfd_boolean (*nlm_backend_object_p) (bfd *);
159  /* Write out the prefix.  This function may be NULL.  This must
160     write out the same number of bytes as is in the field
161     optional_prefix_size.  */
162  bfd_boolean (*nlm_write_prefix) (bfd *);
163  /* Read a relocation fixup from abfd.  The reloc information is
164     machine specific.  The second argument is the symbol if this is
165     an import, or NULL if this is a reloc fixup.  This function
166     should set the third argument to the section which the reloc
167     belongs in, and the fourth argument to the reloc itself; it does
168     not need to fill in the sym_ptr_ptr field for a reloc against an
169     import symbol.  */
170  bfd_boolean (*nlm_read_reloc) (bfd *, nlmNAME (symbol_type) *, asection **, arelent *);
171  /* To make objcopy to an i386 NLM work, the i386 backend needs a
172     chance to work over the relocs.  This is a bit icky.  */
173  bfd_boolean (*nlm_mangle_relocs) (bfd *, asection *, const void *, bfd_vma,  bfd_size_type);
174  /* Read an import record from abfd.  It would be nice if this
175     were in a machine-dependent format, but it doesn't seem to be. */
176  bfd_boolean (*nlm_read_import) (bfd *, nlmNAME (symbol_type) *);
177  /* Write an import record to abfd. */
178  bfd_boolean (*nlm_write_import) (bfd *, asection *, arelent *);
179  /* Set the section for a public symbol.  This may be NULL, in which
180     case a default method will be used.  */
181  bfd_boolean (*nlm_set_public_section) (bfd *, nlmNAME (symbol_type) *);
182  /* Get the offset to write out for a public symbol.  This may be
183     NULL, in which case a default method will be used.  */
184  bfd_vma (*nlm_get_public_offset) (bfd *, asymbol *);
185  /* Swap the fixed header in and out */
186  void (*nlm_swap_fhdr_in)  (bfd *, void *, Nlm_Internal_Fixed_Header *);
187  void (*nlm_swap_fhdr_out) (bfd *, struct nlm_internal_fixed_header *, void *);
188  /* Write out an external reference.  */
189  bfd_boolean (*nlm_write_external) (bfd *, bfd_size_type, asymbol *, struct reloc_and_sec *);
190  bfd_boolean (*nlm_write_export) (bfd *, asymbol *, bfd_vma);
191};
192
193#define nlm_backend(bfd)   ((struct nlm_backend_data *)((bfd) -> xvec -> backend_data))
194#define nlm_signature(bfd)                 (nlm_backend (bfd) -> signature)
195#define nlm_fixed_header_size(bfd)         (nlm_backend (bfd) -> fixed_header_size)
196#define nlm_optional_prefix_size(bfd)      (nlm_backend (bfd) -> optional_prefix_size)
197#define nlm_architecture(bfd)              (nlm_backend (bfd) -> arch)
198#define nlm_machine(bfd)                   (nlm_backend (bfd) -> mach)
199#define nlm_no_uninitialized_data(bfd)     (nlm_backend (bfd) -> no_uninitialized_data)
200#define nlm_backend_object_p_func(bfd)     (nlm_backend (bfd) -> nlm_backend_object_p)
201#define nlm_write_prefix_func(bfd)         (nlm_backend (bfd) -> nlm_write_prefix)
202#define nlm_read_reloc_func(bfd)           (nlm_backend (bfd) -> nlm_read_reloc)
203#define nlm_mangle_relocs_func(bfd)        (nlm_backend (bfd) -> nlm_mangle_relocs)
204#define nlm_read_import_func(bfd)          (nlm_backend (bfd) -> nlm_read_import)
205#define nlm_write_import_func(bfd)         (nlm_backend (bfd) -> nlm_write_import)
206#define nlm_set_public_section_func(bfd)   (nlm_backend (bfd) -> nlm_set_public_section)
207#define nlm_get_public_offset_func(bfd)    (nlm_backend (bfd) -> nlm_get_public_offset)
208#define nlm_swap_fixed_header_in_func(bfd) (nlm_backend (bfd) -> nlm_swap_fhdr_in)
209#define nlm_swap_fixed_header_out_func(bfd)(nlm_backend (bfd) -> nlm_swap_fhdr_out)
210#define nlm_write_external_func(bfd)       (nlm_backend (bfd) -> nlm_write_external)
211#define nlm_write_export_func(bfd)         (nlm_backend (bfd) -> nlm_write_export)
212
213/* The NLM code, data, and uninitialized sections have no names defined
214   in the NLM, but bfd wants to give them names, so use the traditional
215   UNIX names.  */
216
217#define NLM_CODE_NAME			".text"
218#define NLM_INITIALIZED_DATA_NAME	".data"
219#define NLM_UNINITIALIZED_DATA_NAME	".bss"
220
221#endif /* _LIBNLM_H_ */
222