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binutils-gdb/ld/pe-dll.c

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/* Routines to help build PEI-format DLLs (Win32 etc)
Copyright 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
Written by DJ Delorie <dj@cygnus.com>
This file is part of GLD, the Gnu Linker.
GLD 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, or (at your option)
any later version.
GLD 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 GLD; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#include "bfd.h"
#include "sysdep.h"
#include "bfdlink.h"
#include "libiberty.h"
#include "safe-ctype.h"
#include <time.h>
#include "ld.h"
#include "ldexp.h"
#include "ldlang.h"
#include "ldwrite.h"
#include "ldmisc.h"
#include "ldgram.h"
#include "ldmain.h"
#include "ldfile.h"
#include "ldemul.h"
#include "coff/internal.h"
#include "../bfd/libcoff.h"
#include "deffile.h"
#include "pe-dll.h"
/* This file turns a regular Windows PE image into a DLL. Because of
the complexity of this operation, it has been broken down into a
number of separate modules which are all called by the main function
at the end of this file. This function is not re-entrant and is
normally only called once, so static variables are used to reduce
the number of parameters and return values required.
See also: ld/emultempl/pe.em. */
/* Auto-import feature by Paul Sokolovsky
Quick facts:
1. With this feature on, DLL clients can import variables from DLL
without any concern from their side (for example, without any source
code modifications).
2. This is done completely in bounds of the PE specification (to be fair,
there's a place where it pokes nose out of, but in practise it works).
So, resulting module can be used with any other PE compiler/linker.
3. Auto-import is fully compatible with standard import method and they
can be mixed together.
4. Overheads: space: 8 bytes per imported symbol, plus 20 for each
reference to it; load time: negligible; virtual/physical memory: should be
less than effect of DLL relocation, and I sincerely hope it doesn't affect
DLL sharability (too much).
Idea
The obvious and only way to get rid of dllimport insanity is to make client
access variable directly in the DLL, bypassing extra dereference. I.e.,
whenever client contains someting like
mov dll_var,%eax,
address of dll_var in the command should be relocated to point into loaded
DLL. The aim is to make OS loader do so, and than make ld help with that.
Import section of PE made following way: there's a vector of structures
each describing imports from particular DLL. Each such structure points
to two other parellel vectors: one holding imported names, and one which
will hold address of corresponding imported name. So, the solution is
de-vectorize these structures, making import locations be sparse and
pointing directly into code. Before continuing, it is worth a note that,
while authors strives to make PE act ELF-like, there're some other people
make ELF act PE-like: elfvector, ;-) .
Implementation
For each reference of data symbol to be imported from DLL (to set of which
belong symbols with name <sym>, if __imp_<sym> is found in implib), the
import fixup entry is generated. That entry is of type
IMAGE_IMPORT_DESCRIPTOR and stored in .idata$3 subsection. Each
fixup entry contains pointer to symbol's address within .text section
(marked with __fuN_<sym> symbol, where N is integer), pointer to DLL name
(so, DLL name is referenced by multiple entries), and pointer to symbol
name thunk. Symbol name thunk is singleton vector (__nm_th_<symbol>)
pointing to IMAGE_IMPORT_BY_NAME structure (__nm_<symbol>) directly
containing imported name. Here comes that "om the edge" problem mentioned
above: PE specification rambles that name vector (OriginalFirstThunk)
should run in parallel with addresses vector (FirstThunk), i.e. that they
should have same number of elements and terminated with zero. We violate
this, since FirstThunk points directly into machine code. But in practise,
OS loader implemented the sane way: it goes thru OriginalFirstThunk and
puts addresses to FirstThunk, not something else. It once again should be
noted that dll and symbol name structures are reused across fixup entries
and should be there anyway to support standard import stuff, so sustained
overhead is 20 bytes per reference. Other question is whether having several
IMAGE_IMPORT_DESCRIPTORS for the same DLL is possible. Answer is yes, it is
done even by native compiler/linker (libth32's functions are in fact reside
in windows9x kernel32.dll, so if you use it, you have two
IMAGE_IMPORT_DESCRIPTORS for kernel32.dll). Yet other question is whether
referencing the same PE structures several times is valid. The answer is why
not, prohibitting that (detecting violation) would require more work on
behalf of loader than not doing it.
See also: ld/emultempl/pe.em. */
static void
add_bfd_to_link PARAMS ((bfd *, const char *, struct bfd_link_info *));
/* For emultempl/pe.em. */
def_file * pe_def_file = 0;
int pe_dll_export_everything = 0;
int pe_dll_do_default_excludes = 1;
int pe_dll_kill_ats = 0;
int pe_dll_stdcall_aliases = 0;
int pe_dll_warn_dup_exports = 0;
int pe_dll_compat_implib = 0;
int pe_dll_extra_pe_debug = 0;
/* Static variables and types. */
static bfd_vma image_base;
static bfd *filler_bfd;
static struct sec *edata_s, *reloc_s;
static unsigned char *edata_d, *reloc_d;
static size_t edata_sz, reloc_sz;
typedef struct
{
char *target_name;
char *object_target;
unsigned int imagebase_reloc;
int pe_arch;
int bfd_arch;
int underscored;
}
pe_details_type;
typedef struct
{
char *name;
int len;
}
autofilter_entry_type;
#define PE_ARCH_i386 1
#define PE_ARCH_sh 2
#define PE_ARCH_mips 3
#define PE_ARCH_arm 4
#define PE_ARCH_arm_epoc 5
static pe_details_type pe_detail_list[] =
{
{
"pei-i386",
"pe-i386",
7 /* R_IMAGEBASE */,
PE_ARCH_i386,
bfd_arch_i386,
1
},
{
"pei-shl",
"pe-shl",
16 /* R_SH_IMAGEBASE */,
PE_ARCH_sh,
bfd_arch_sh,
1
},
{
"pei-mips",
"pe-mips",
34 /* MIPS_R_RVA */,
PE_ARCH_mips,
bfd_arch_mips,
0
},
{
"pei-arm-little",
"pe-arm-little",
11 /* ARM_RVA32 */,
PE_ARCH_arm,
bfd_arch_arm,
0
},
{
"epoc-pei-arm-little",
"epoc-pe-arm-little",
11 /* ARM_RVA32 */,
PE_ARCH_arm_epoc,
bfd_arch_arm,
0
},
{ NULL, NULL, 0, 0, 0, 0 }
};
static pe_details_type *pe_details;
static autofilter_entry_type autofilter_symbollist[] =
{
{ "DllMain@12", 10 },
{ "DllEntryPoint@0", 15 },
{ "DllMainCRTStartup@12", 20 },
{ "_cygwin_dll_entry@12", 20 },
{ "_cygwin_crt0_common@8", 21 },
{ "_cygwin_noncygwin_dll_entry@12", 30 },
{ "impure_ptr", 10 },
{ NULL, 0 }
};
/* Do not specify library suffix explicitly, to allow for dllized versions. */
static autofilter_entry_type autofilter_liblist[] =
{
{ "libgcc.", 7 },
{ "libstdc++.", 10 },
{ "libmingw32.", 11 },
{ NULL, 0 }
};
static autofilter_entry_type autofilter_objlist[] =
{
{ "crt0.o", 6 },
{ "crt1.o", 6 },
{ "crt2.o", 6 },
{ NULL, 0 }
};
static autofilter_entry_type autofilter_symbolprefixlist[] =
{
/* { "__imp_", 6 }, */
/* Do __imp_ explicitly to save time. */
{ "__rtti_", 7 },
{ "__builtin_", 10 },
/* Don't export symbols specifying internal DLL layout. */
{ "_head_", 6 },
{ "_fmode", 6 },
{ "_impure_ptr", 11 },
{ "cygwin_attach_dll", 17 },
{ "cygwin_premain0", 15 },
{ "cygwin_premain1", 15 },
{ "cygwin_premain2", 15 },
{ "cygwin_premain3", 15 },
{ "environ", 7 },
{ NULL, 0 }
};
static autofilter_entry_type autofilter_symbolsuffixlist[] =
{
{ "_iname", 6 },
{ NULL, 0 }
};
#define U(str) (pe_details->underscored ? "_" str : str)
static int reloc_sort PARAMS ((const void *, const void *));
static int pe_export_sort PARAMS ((const void *, const void *));
static int auto_export PARAMS ((bfd *, def_file *, const char *));
static void process_def_file PARAMS ((bfd *, struct bfd_link_info *));
static void build_filler_bfd PARAMS ((int));
static void generate_edata PARAMS ((bfd *, struct bfd_link_info *));
static void fill_exported_offsets PARAMS ((bfd *, struct bfd_link_info *));
static void fill_edata PARAMS ((bfd *, struct bfd_link_info *));
static void generate_reloc PARAMS ((bfd *, struct bfd_link_info *));
static void quoteput PARAMS ((char *, FILE *, int));
static asection *quick_section PARAMS ((bfd *, const char *, int, int));
static void quick_symbol
PARAMS ((bfd *, const char *, const char *, const char *,
asection *, int, int));
static void quick_reloc PARAMS ((bfd *, int, int, int));
static bfd *make_head PARAMS ((bfd *));
static bfd *make_tail PARAMS ((bfd *));
static bfd *make_one PARAMS ((def_file_export *, bfd *));
static bfd *make_singleton_name_thunk PARAMS ((const char *, bfd *));
static char *make_import_fixup_mark PARAMS ((arelent *));
static bfd *make_import_fixup_entry
PARAMS ((const char *, const char *, const char *, bfd *));
static unsigned int pe_get16 PARAMS ((bfd *, int));
static unsigned int pe_get32 PARAMS ((bfd *, int));
static unsigned int pe_as32 PARAMS ((void *));
void
pe_dll_id_target (target)
const char *target;
{
int i;
for (i = 0; pe_detail_list[i].target_name; i++)
if (strcmp (pe_detail_list[i].target_name, target) == 0
|| strcmp (pe_detail_list[i].object_target, target) == 0)
{
pe_details = pe_detail_list + i;
return;
}
einfo (_("%XUnsupported PEI architecture: %s\n"), target);
exit (1);
}
/* Helper functions for qsort. Relocs must be sorted so that we can write
them out by pages. */
typedef struct
{
bfd_vma vma;
char type;
short extra;
}
reloc_data_type;
static int
reloc_sort (va, vb)
const void *va, *vb;
{
bfd_vma a = ((reloc_data_type *) va)->vma;
bfd_vma b = ((reloc_data_type *) vb)->vma;
return (a > b) ? 1 : ((a < b) ? -1 : 0);
}
static int
pe_export_sort (va, vb)
const void *va, *vb;
{
def_file_export *a = (def_file_export *) va;
def_file_export *b = (def_file_export *) vb;
return strcmp (a->name, b->name);
}
/* Read and process the .DEF file. */
/* These correspond to the entries in pe_def_file->exports[]. I use
exported_symbol_sections[i] to tag whether or not the symbol was
defined, since we can't export symbols we don't have. */
static bfd_vma *exported_symbol_offsets;
static struct sec **exported_symbol_sections;
static int export_table_size;
static int count_exported;
static int count_exported_byname;
static int count_with_ordinals;
static const char *dll_name;
static int min_ordinal, max_ordinal;
static int *exported_symbols;
typedef struct exclude_list_struct
{
char *string;
struct exclude_list_struct *next;
}
exclude_list_struct;
static struct exclude_list_struct *excludes = 0;
void
pe_dll_add_excludes (new_excludes)
const char *new_excludes;
{
char *local_copy;
char *exclude_string;
local_copy = xstrdup (new_excludes);
exclude_string = strtok (local_copy, ",:");
for (; exclude_string; exclude_string = strtok (NULL, ",:"))
{
struct exclude_list_struct *new_exclude;
new_exclude = ((struct exclude_list_struct *)
xmalloc (sizeof (struct exclude_list_struct)));
new_exclude->string = (char *) xmalloc (strlen (exclude_string) + 1);
strcpy (new_exclude->string, exclude_string);
new_exclude->next = excludes;
excludes = new_exclude;
}
free (local_copy);
}
/* abfd is a bfd containing n (or NULL)
It can be used for contextual checks. */
static int
auto_export (abfd, d, n)
bfd *abfd;
def_file *d;
const char *n;
{
int i;
struct exclude_list_struct *ex;
autofilter_entry_type *afptr;
/* We should not re-export imported stuff. */
if (strncmp (n, "_imp__", 6) == 0)
return 0;
for (i = 0; i < d->num_exports; i++)
if (strcmp (d->exports[i].name, n) == 0)
return 0;
if (pe_dll_do_default_excludes)
{
char * p;
int len;
if (pe_dll_extra_pe_debug)
printf ("considering exporting: %s, abfd=%p, abfd->my_arc=%p\n",
n, abfd, abfd->my_archive);
/* First of all, make context checks:
Don't export anything from libgcc. */
if (abfd && abfd->my_archive)
{
afptr = autofilter_liblist;
while (afptr->name)
{
if (strstr (abfd->my_archive->filename, afptr->name))
return 0;
afptr++;
}
}
/* Next, exclude symbols from certain startup objects. */
afptr = autofilter_objlist;
while (afptr->name)
{
if (abfd &&
(p = strstr (abfd->filename, afptr->name)) &&
(*(p + afptr->len - 1) == 0))
return 0;
afptr ++;
}
/* Don't try to blindly exclude all symbols
that begin with '__'; this was tried and
it is too restrictive. */
/* Then, exclude specific symbols. */
afptr = autofilter_symbollist;
while (afptr->name)
{
if (strcmp (n, afptr->name) == 0)
return 0;
afptr ++;
}
/* Next, exclude symbols starting with ... */
afptr = autofilter_symbolprefixlist;
while (afptr->name)
{
if (strncmp (n, afptr->name, afptr->len) == 0)
return 0;
afptr ++;
}
/* Finally, exclude symbols ending with ... */
len = strlen (n);
afptr = autofilter_symbolsuffixlist;
while (afptr->name)
{
if ((len >= afptr->len) &&
/* Add 1 to insure match with trailing '\0'. */
strncmp (n + len - afptr->len, afptr->name,
afptr->len + 1) == 0)
return 0;
afptr ++;
}
}
for (ex = excludes; ex; ex = ex->next)
if (strcmp (n, ex->string) == 0)
return 0;
return 1;
}
static void
process_def_file (abfd, info)
bfd *abfd ATTRIBUTE_UNUSED;
struct bfd_link_info *info;
{
int i, j;
struct bfd_link_hash_entry *blhe;
bfd *b;
struct sec *s;
def_file_export *e = 0;
if (!pe_def_file)
pe_def_file = def_file_empty ();
/* First, run around to all the objects looking for the .drectve
sections, and push those into the def file too. */
for (b = info->input_bfds; b; b = b->link_next)
{
s = bfd_get_section_by_name (b, ".drectve");
if (s)
{
int size = bfd_get_section_size_before_reloc (s);
char *buf = xmalloc (size);
bfd_get_section_contents (b, s, buf, 0, size);
def_file_add_directive (pe_def_file, buf, size);
free (buf);
}
}
/* Now, maybe export everything else the default way. */
if (pe_dll_export_everything || pe_def_file->num_exports == 0)
{
for (b = info->input_bfds; b; b = b->link_next)
{
asymbol **symbols;
int nsyms, symsize;
symsize = bfd_get_symtab_upper_bound (b);
symbols = (asymbol **) xmalloc (symsize);
nsyms = bfd_canonicalize_symtab (b, symbols);
for (j = 0; j < nsyms; j++)
{
/* We should export symbols which are either global or not
anything at all. (.bss data is the latter)
We should not export undefined symbols. */
if (symbols[j]->section != &bfd_und_section
&& ((symbols[j]->flags & BSF_GLOBAL)
|| (symbols[j]->flags == BFD_FORT_COMM_DEFAULT_VALUE)))
{
const char *sn = symbols[j]->name;
/* We should not re-export imported stuff. */
{
char *name = (char *) xmalloc (strlen (sn) + 2 + 6);
sprintf (name, "%s%s", U("_imp_"), sn);
blhe = bfd_link_hash_lookup (info->hash, name,
false, false, false);
free (name);
if (blhe && blhe->type == bfd_link_hash_defined)
continue;
}
if (*sn == '_')
sn++;
if (auto_export (b, pe_def_file, sn))
{
def_file_export *p;
p=def_file_add_export (pe_def_file, sn, 0, -1);
/* Fill data flag properly, from dlltool.c. */
p->flag_data = !(symbols[j]->flags & BSF_FUNCTION);
}
}
}
}
}
#undef NE
#define NE pe_def_file->num_exports
/* Canonicalize the export list. */
if (pe_dll_kill_ats)
{
for (i = 0; i < NE; i++)
{
if (strchr (pe_def_file->exports[i].name, '@'))
{
/* This will preserve internal_name, which may have been
pointing to the same memory as name, or might not
have. */
char *tmp = xstrdup (pe_def_file->exports[i].name);
*(strchr (tmp, '@')) = 0;
pe_def_file->exports[i].name = tmp;
}
}
}
if (pe_dll_stdcall_aliases)
{
for (i = 0; i < NE; i++)
{
if (strchr (pe_def_file->exports[i].name, '@'))
{
char *tmp = xstrdup (pe_def_file->exports[i].name);
*(strchr (tmp, '@')) = 0;
if (auto_export (NULL, pe_def_file, tmp))
def_file_add_export (pe_def_file, tmp,
pe_def_file->exports[i].internal_name,
-1);
else
free (tmp);
}
}
}
/* Convenience, but watch out for it changing. */
e = pe_def_file->exports;
exported_symbol_offsets = (bfd_vma *) xmalloc (NE * sizeof (bfd_vma));
exported_symbol_sections = (struct sec **) xmalloc (NE * sizeof (struct sec *));
memset (exported_symbol_sections, 0, NE * sizeof (struct sec *));
max_ordinal = 0;
min_ordinal = 65536;
count_exported = 0;
count_exported_byname = 0;
count_with_ordinals = 0;
qsort (pe_def_file->exports, NE, sizeof (pe_def_file->exports[0]), pe_export_sort);
for (i = 0, j = 0; i < NE; i++)
{
if (i > 0 && strcmp (e[i].name, e[i - 1].name) == 0)
{
/* This is a duplicate. */
if (e[j - 1].ordinal != -1
&& e[i].ordinal != -1
&& e[j - 1].ordinal != e[i].ordinal)
{
if (pe_dll_warn_dup_exports)
/* xgettext:c-format */
einfo (_("%XError, duplicate EXPORT with ordinals: %s (%d vs %d)\n"),
e[j - 1].name, e[j - 1].ordinal, e[i].ordinal);
}
else
{
if (pe_dll_warn_dup_exports)
/* xgettext:c-format */
einfo (_("Warning, duplicate EXPORT: %s\n"),
e[j - 1].name);
}
if (e[i].ordinal != -1)
e[j - 1].ordinal = e[i].ordinal;
e[j - 1].flag_private |= e[i].flag_private;
e[j - 1].flag_constant |= e[i].flag_constant;
e[j - 1].flag_noname |= e[i].flag_noname;
e[j - 1].flag_data |= e[i].flag_data;
}
else
{
if (i != j)
e[j] = e[i];
j++;
}
}
pe_def_file->num_exports = j; /* == NE */
for (i = 0; i < NE; i++)
{
char *name = (char *) xmalloc (strlen (pe_def_file->exports[i].internal_name) + 2);
if (pe_details->underscored)
{
*name = '_';
strcpy (name + 1, pe_def_file->exports[i].internal_name);
}
else
strcpy (name, pe_def_file->exports[i].internal_name);
blhe = bfd_link_hash_lookup (info->hash,
name,
false, false, true);
if (blhe
&& (blhe->type == bfd_link_hash_defined
|| (blhe->type == bfd_link_hash_common)))
{
count_exported++;
if (!pe_def_file->exports[i].flag_noname)
count_exported_byname++;
/* Only fill in the sections. The actual offsets are computed
in fill_exported_offsets() after common symbols are laid
out. */
if (blhe->type == bfd_link_hash_defined)
exported_symbol_sections[i] = blhe->u.def.section;
else
exported_symbol_sections[i] = blhe->u.c.p->section;
if (pe_def_file->exports[i].ordinal != -1)
{
if (max_ordinal < pe_def_file->exports[i].ordinal)
max_ordinal = pe_def_file->exports[i].ordinal;
if (min_ordinal > pe_def_file->exports[i].ordinal)
min_ordinal = pe_def_file->exports[i].ordinal;
count_with_ordinals++;
}
}
else if (blhe && blhe->type == bfd_link_hash_undefined)
{
/* xgettext:c-format */
einfo (_("%XCannot export %s: symbol not defined\n"),
pe_def_file->exports[i].internal_name);
}
else if (blhe)
{
/* xgettext:c-format */
einfo (_("%XCannot export %s: symbol wrong type (%d vs %d)\n"),
pe_def_file->exports[i].internal_name,
blhe->type, bfd_link_hash_defined);
}
else
{
/* xgettext:c-format */
einfo (_("%XCannot export %s: symbol not found\n"),
pe_def_file->exports[i].internal_name);
}
free (name);
}
}
/* Build the bfd that will contain .edata and .reloc sections. */
static void
build_filler_bfd (include_edata)
int include_edata;
{
lang_input_statement_type *filler_file;
filler_file = lang_add_input_file ("dll stuff",
lang_input_file_is_fake_enum,
NULL);
filler_file->the_bfd = filler_bfd = bfd_create ("dll stuff", output_bfd);
if (filler_bfd == NULL
|| !bfd_set_arch_mach (filler_bfd,
bfd_get_arch (output_bfd),
bfd_get_mach (output_bfd)))
{
einfo ("%X%P: can not create BFD %E\n");
return;
}
if (include_edata)
{
edata_s = bfd_make_section_old_way (filler_bfd, ".edata");
if (edata_s == NULL
|| !bfd_set_section_flags (filler_bfd, edata_s,
(SEC_HAS_CONTENTS
| SEC_ALLOC
| SEC_LOAD
| SEC_KEEP
| SEC_IN_MEMORY)))
{
einfo ("%X%P: can not create .edata section: %E\n");
return;
}
bfd_set_section_size (filler_bfd, edata_s, edata_sz);
}
reloc_s = bfd_make_section_old_way (filler_bfd, ".reloc");
if (reloc_s == NULL
|| !bfd_set_section_flags (filler_bfd, reloc_s,
(SEC_HAS_CONTENTS
| SEC_ALLOC
| SEC_LOAD
| SEC_KEEP
| SEC_IN_MEMORY)))
{
einfo ("%X%P: can not create .reloc section: %E\n");
return;
}
bfd_set_section_size (filler_bfd, reloc_s, 0);
ldlang_add_file (filler_file);
}
/* Gather all the exported symbols and build the .edata section. */
static void
generate_edata (abfd, info)
bfd *abfd;
struct bfd_link_info *info ATTRIBUTE_UNUSED;
{
int i, next_ordinal;
int name_table_size = 0;
const char *dlnp;
/* First, we need to know how many exported symbols there are,
and what the range of ordinals is. */
if (pe_def_file->name)
dll_name = pe_def_file->name;
else
{
dll_name = abfd->filename;
for (dlnp = dll_name; *dlnp; dlnp++)
if (*dlnp == '\\' || *dlnp == '/' || *dlnp == ':')
dll_name = dlnp + 1;
}
if (count_with_ordinals && max_ordinal > count_exported)
{
if (min_ordinal > max_ordinal - count_exported + 1)
min_ordinal = max_ordinal - count_exported + 1;
}
else
{
min_ordinal = 1;
max_ordinal = count_exported;
}
export_table_size = max_ordinal - min_ordinal + 1;
exported_symbols = (int *) xmalloc (export_table_size * sizeof (int));
for (i = 0; i < export_table_size; i++)
exported_symbols[i] = -1;
/* Now we need to assign ordinals to those that don't have them. */
for (i = 0; i < NE; i++)
{
if (exported_symbol_sections[i])
{
if (pe_def_file->exports[i].ordinal != -1)
{
int ei = pe_def_file->exports[i].ordinal - min_ordinal;
int pi = exported_symbols[ei];
if (pi != -1)
{
/* xgettext:c-format */
einfo (_("%XError, ordinal used twice: %d (%s vs %s)\n"),
pe_def_file->exports[i].ordinal,
pe_def_file->exports[i].name,
pe_def_file->exports[pi].name);
}
exported_symbols[ei] = i;
}
name_table_size += strlen (pe_def_file->exports[i].name) + 1;
}
}
next_ordinal = min_ordinal;
for (i = 0; i < NE; i++)
if (exported_symbol_sections[i])
if (pe_def_file->exports[i].ordinal == -1)
{
while (exported_symbols[next_ordinal - min_ordinal] != -1)
next_ordinal ++;
exported_symbols[next_ordinal - min_ordinal] = i;
pe_def_file->exports[i].ordinal = next_ordinal;
}
/* OK, now we can allocate some memory. */
edata_sz = (40 /* directory */
+ 4 * export_table_size /* addresses */
+ 4 * count_exported_byname /* name ptrs */
+ 2 * count_exported_byname /* ordinals */
+ name_table_size + strlen (dll_name) + 1);
}
/* Fill the exported symbol offsets. The preliminary work has already
been done in process_def_file(). */
static void
fill_exported_offsets (abfd, info)
bfd *abfd ATTRIBUTE_UNUSED;
struct bfd_link_info *info;
{
int i;
struct bfd_link_hash_entry *blhe;
for (i = 0; i < pe_def_file->num_exports; i++)
{
char *name = (char *) xmalloc (strlen (pe_def_file->exports[i].internal_name) + 2);
if (pe_details->underscored)
{
*name = '_';
strcpy (name + 1, pe_def_file->exports[i].internal_name);
}
else
strcpy (name, pe_def_file->exports[i].internal_name);
blhe = bfd_link_hash_lookup (info->hash,
name,
false, false, true);
if (blhe && (blhe->type == bfd_link_hash_defined))
exported_symbol_offsets[i] = blhe->u.def.value;
free (name);
}
}
static void
fill_edata (abfd, info)
bfd *abfd;
struct bfd_link_info *info ATTRIBUTE_UNUSED;
{
int i, hint;
unsigned char *edirectory;
unsigned long *eaddresses;
unsigned long *enameptrs;
unsigned short *eordinals;
unsigned char *enamestr;
time_t now;
time (&now);
edata_d = (unsigned char *) xmalloc (edata_sz);
/* Note use of array pointer math here. */
edirectory = edata_d;
eaddresses = (unsigned long *) (edata_d + 40);
enameptrs = eaddresses + export_table_size;
eordinals = (unsigned short *) (enameptrs + count_exported_byname);
enamestr = (char *) (eordinals + count_exported_byname);
#define ERVA(ptr) (((unsigned char *)(ptr) - edata_d) + edata_s->output_section->vma - image_base)
memset (edata_d, 0, edata_sz);
bfd_put_32 (abfd, now, edata_d + 4);
if (pe_def_file->version_major != -1)
{
bfd_put_16 (abfd, pe_def_file->version_major, edata_d + 8);
bfd_put_16 (abfd, pe_def_file->version_minor, edata_d + 10);
}
bfd_put_32 (abfd, ERVA (enamestr), edata_d + 12);
strcpy (enamestr, dll_name);
enamestr += strlen (enamestr) + 1;
bfd_put_32 (abfd, min_ordinal, edata_d + 16);
bfd_put_32 (abfd, export_table_size, edata_d + 20);
bfd_put_32 (abfd, count_exported_byname, edata_d + 24);
bfd_put_32 (abfd, ERVA (eaddresses), edata_d + 28);
bfd_put_32 (abfd, ERVA (enameptrs), edata_d + 32);
bfd_put_32 (abfd, ERVA (eordinals), edata_d + 36);
fill_exported_offsets (abfd, info);
/* Ok, now for the filling in part. */
hint = 0;
for (i = 0; i < export_table_size; i++)
{
int s = exported_symbols[i];
if (s != -1)
{
struct sec *ssec = exported_symbol_sections[s];
unsigned long srva = (exported_symbol_offsets[s]
+ ssec->output_section->vma
+ ssec->output_offset);
int ord = pe_def_file->exports[s].ordinal;
bfd_put_32 (abfd, srva - image_base,
(void *) (eaddresses + ord - min_ordinal));
if (!pe_def_file->exports[s].flag_noname)
{
char *ename = pe_def_file->exports[s].name;
bfd_put_32 (abfd, ERVA (enamestr), (void *) enameptrs);
enameptrs++;
strcpy (enamestr, ename);
enamestr += strlen (enamestr) + 1;
bfd_put_16 (abfd, ord - min_ordinal, (void *) eordinals);
eordinals++;
pe_def_file->exports[s].hint = hint++;
}
}
}
}
static struct sec *current_sec;
void
pe_walk_relocs_of_symbol (info, name, cb)
struct bfd_link_info *info;
const char *name;
int (*cb) (arelent *, asection *);
{
bfd *b;
asection *s;
for (b = info->input_bfds; b; b = b->link_next)
{
asymbol **symbols;
int nsyms, symsize;
symsize = bfd_get_symtab_upper_bound (b);
symbols = (asymbol **) xmalloc (symsize);
nsyms = bfd_canonicalize_symtab (b, symbols);
for (s = b->sections; s; s = s->next)
{
arelent **relocs;
int relsize, nrelocs, i;
int flags = bfd_get_section_flags (b, s);
/* Skip discarded linkonce sections. */
if (flags & SEC_LINK_ONCE
&& s->output_section == bfd_abs_section_ptr)
continue;
current_sec = s;
relsize = bfd_get_reloc_upper_bound (b, s);
relocs = (arelent **) xmalloc ((size_t) relsize);
nrelocs = bfd_canonicalize_reloc (b, s, relocs, symbols);
for (i = 0; i < nrelocs; i++)
{
struct symbol_cache_entry *sym = *relocs[i]->sym_ptr_ptr;
if (!strcmp (name, sym->name))
cb (relocs[i], s);
}
free (relocs);
/* Warning: the allocated symbols are remembered in BFD and reused
later, so don't free them! */
/* free (symbols); */
}
}
}
/* Gather all the relocations and build the .reloc section. */
static void
generate_reloc (abfd, info)
bfd *abfd;
struct bfd_link_info *info;
{
/* For .reloc stuff. */
reloc_data_type *reloc_data;
int total_relocs = 0;
int i;
unsigned long sec_page = (unsigned long) (-1);
unsigned long page_ptr, page_count;
int bi;
bfd *b;
struct sec *s;
total_relocs = 0;
for (b = info->input_bfds; b; b = b->link_next)
for (s = b->sections; s; s = s->next)
total_relocs += s->reloc_count;
reloc_data =
(reloc_data_type *) xmalloc (total_relocs * sizeof (reloc_data_type));
total_relocs = 0;
bi = 0;
for (bi = 0, b = info->input_bfds; b; bi++, b = b->link_next)
{
arelent **relocs;
int relsize, nrelocs, i;
for (s = b->sections; s; s = s->next)
{
unsigned long sec_vma = s->output_section->vma + s->output_offset;
asymbol **symbols;
int nsyms, symsize;
/* If it's not loaded, we don't need to relocate it this way. */
if (!(s->output_section->flags & SEC_LOAD))
continue;
/* I don't know why there would be a reloc for these, but I've
seen it happen - DJ */
if (s->output_section == &bfd_abs_section)
continue;
if (s->output_section->vma == 0)
{
/* Huh? Shouldn't happen, but punt if it does. */
einfo ("DJ: zero vma section reloc detected: `%s' #%d f=%d\n",
s->output_section->name, s->output_section->index,
s->output_section->flags);
continue;
}
symsize = bfd_get_symtab_upper_bound (b);
symbols = (asymbol **) xmalloc (symsize);
nsyms = bfd_canonicalize_symtab (b, symbols);
relsize = bfd_get_reloc_upper_bound (b, s);
relocs = (arelent **) xmalloc ((size_t) relsize);
nrelocs = bfd_canonicalize_reloc (b, s, relocs, symbols);
for (i = 0; i < nrelocs; i++)
{
if (pe_dll_extra_pe_debug)
{
struct symbol_cache_entry *sym = *relocs[i]->sym_ptr_ptr;
printf("rel: %s\n",sym->name);
}
if (!relocs[i]->howto->pc_relative
&& relocs[i]->howto->type != pe_details->imagebase_reloc)
{
bfd_vma sym_vma;
struct symbol_cache_entry *sym = *relocs[i]->sym_ptr_ptr;
sym_vma = (relocs[i]->addend
+ sym->value
+ sym->section->vma
+ sym->section->output_offset
+ sym->section->output_section->vma);
reloc_data[total_relocs].vma = sec_vma + relocs[i]->address;
#define BITS_AND_SHIFT(bits, shift) (bits * 1000 | shift)
switch BITS_AND_SHIFT (relocs[i]->howto->bitsize,
relocs[i]->howto->rightshift)
{
case BITS_AND_SHIFT (32, 0):
reloc_data[total_relocs].type = 3;
total_relocs++;
break;
case BITS_AND_SHIFT (16, 0):
reloc_data[total_relocs].type = 2;
total_relocs++;
break;
case BITS_AND_SHIFT (16, 16):
reloc_data[total_relocs].type = 4;
/* FIXME: we can't know the symbol's right value
yet, but we probably can safely assume that
CE will relocate us in 64k blocks, so leaving
it zero is safe. */
reloc_data[total_relocs].extra = 0;
total_relocs++;
break;
case BITS_AND_SHIFT (26, 2):
reloc_data[total_relocs].type = 5;
total_relocs++;
break;
default:
/* xgettext:c-format */
einfo (_("%XError: %d-bit reloc in dll\n"),
relocs[i]->howto->bitsize);
break;
}
}
}
free (relocs);
/* Warning: the allocated symbols are remembered in BFD and
reused later, so don't free them! */
#if 0
free (symbol);
#endif
}
}
/* At this point, we have total_relocs relocation addresses in
reloc_addresses, which are all suitable for the .reloc section.
We must now create the new sections. */
qsort (reloc_data, total_relocs, sizeof (*reloc_data), reloc_sort);
for (i = 0; i < total_relocs; i++)
{
unsigned long this_page = (reloc_data[i].vma >> 12);
if (this_page != sec_page)
{
reloc_sz = (reloc_sz + 3) & ~3; /* 4-byte align. */
reloc_sz += 8;
sec_page = this_page;
}
reloc_sz += 2;
if (reloc_data[i].type == 4)
reloc_sz += 2;
}
reloc_sz = (reloc_sz + 3) & ~3; /* 4-byte align. */
reloc_d = (unsigned char *) xmalloc (reloc_sz);
sec_page = (unsigned long) (-1);
reloc_sz = 0;
page_ptr = (unsigned long) (-1);
page_count = 0;
for (i = 0; i < total_relocs; i++)
{
unsigned long rva = reloc_data[i].vma - image_base;
unsigned long this_page = (rva & ~0xfff);
if (this_page != sec_page)
{
while (reloc_sz & 3)
reloc_d[reloc_sz++] = 0;
if (page_ptr != (unsigned long) (-1))
bfd_put_32 (abfd, reloc_sz - page_ptr, reloc_d + page_ptr + 4);
bfd_put_32 (abfd, this_page, reloc_d + reloc_sz);
page_ptr = reloc_sz;
reloc_sz += 8;
sec_page = this_page;
page_count = 0;
}
bfd_put_16 (abfd, (rva & 0xfff) + (reloc_data[i].type << 12),
reloc_d + reloc_sz);
reloc_sz += 2;
if (reloc_data[i].type == 4)
{
bfd_put_16 (abfd, reloc_data[i].extra, reloc_d + reloc_sz);
reloc_sz += 2;
}
page_count++;
}
while (reloc_sz & 3)
reloc_d[reloc_sz++] = 0;
if (page_ptr != (unsigned long) (-1))
bfd_put_32 (abfd, reloc_sz - page_ptr, reloc_d + page_ptr + 4);
while (reloc_sz < reloc_s->_raw_size)
reloc_d[reloc_sz++] = 0;
}
/* Given the exiting def_file structure, print out a .DEF file that
corresponds to it. */
static void
quoteput (s, f, needs_quotes)
char *s;
FILE *f;
int needs_quotes;
{
char *cp;
for (cp = s; *cp; cp++)
if (*cp == '\''
|| *cp == '"'
|| *cp == '\\'
|| ISSPACE (*cp)
|| *cp == ','
|| *cp == ';')
needs_quotes = 1;
if (needs_quotes)
{
putc ('"', f);
while (*s)
{
if (*s == '"' || *s == '\\')
putc ('\\', f);
putc (*s, f);
s++;
}
putc ('"', f);
}
else
fputs (s, f);
}
void
pe_dll_generate_def_file (pe_out_def_filename)
const char *pe_out_def_filename;
{
int i;
FILE *out = fopen (pe_out_def_filename, "w");
if (out == NULL)
/* xgettext:c-format */
einfo (_("%s: Can't open output def file %s\n"),
program_name, pe_out_def_filename);
if (pe_def_file)
{
if (pe_def_file->name)
{
if (pe_def_file->is_dll)
fprintf (out, "LIBRARY ");
else
fprintf (out, "NAME ");
quoteput (pe_def_file->name, out, 1);
if (pe_data (output_bfd)->pe_opthdr.ImageBase)
fprintf (out, " BASE=0x%lx",
(unsigned long) pe_data (output_bfd)->pe_opthdr.ImageBase);
fprintf (out, "\n");
}
if (pe_def_file->description)
{
fprintf (out, "DESCRIPTION ");
quoteput (pe_def_file->description, out, 1);
fprintf (out, "\n");
}
if (pe_def_file->version_minor != -1)
fprintf (out, "VERSION %d.%d\n", pe_def_file->version_major,
pe_def_file->version_minor);
else if (pe_def_file->version_major != -1)
fprintf (out, "VERSION %d\n", pe_def_file->version_major);
if (pe_def_file->stack_reserve != -1 || pe_def_file->heap_reserve != -1)
fprintf (out, "\n");
if (pe_def_file->stack_commit != -1)
fprintf (out, "STACKSIZE 0x%x,0x%x\n",
pe_def_file->stack_reserve, pe_def_file->stack_commit);
else if (pe_def_file->stack_reserve != -1)
fprintf (out, "STACKSIZE 0x%x\n", pe_def_file->stack_reserve);
if (pe_def_file->heap_commit != -1)
fprintf (out, "HEAPSIZE 0x%x,0x%x\n",
pe_def_file->heap_reserve, pe_def_file->heap_commit);
else if (pe_def_file->heap_reserve != -1)
fprintf (out, "HEAPSIZE 0x%x\n", pe_def_file->heap_reserve);
if (pe_def_file->num_section_defs > 0)
{
fprintf (out, "\nSECTIONS\n\n");
for (i = 0; i < pe_def_file->num_section_defs; i++)
{
fprintf (out, " ");
quoteput (pe_def_file->section_defs[i].name, out, 0);
if (pe_def_file->section_defs[i].class)
{
fprintf (out, " CLASS ");
quoteput (pe_def_file->section_defs[i].class, out, 0);
}
if (pe_def_file->section_defs[i].flag_read)
fprintf (out, " READ");
if (pe_def_file->section_defs[i].flag_write)
fprintf (out, " WRITE");
if (pe_def_file->section_defs[i].flag_execute)
fprintf (out, " EXECUTE");
if (pe_def_file->section_defs[i].flag_shared)
fprintf (out, " SHARED");
fprintf (out, "\n");
}
}
if (pe_def_file->num_exports > 0)
{
fprintf (out, "EXPORTS\n");
for (i = 0; i < pe_def_file->num_exports; i++)
{
def_file_export *e = pe_def_file->exports + i;
fprintf (out, " ");
quoteput (e->name, out, 0);
if (e->internal_name && strcmp (e->internal_name, e->name))
{
fprintf (out, " = ");
quoteput (e->internal_name, out, 0);
}
if (e->ordinal != -1)
fprintf (out, " @%d", e->ordinal);
if (e->flag_private)
fprintf (out, " PRIVATE");
if (e->flag_constant)
fprintf (out, " CONSTANT");
if (e->flag_noname)
fprintf (out, " NONAME");
if (e->flag_data)
fprintf (out, " DATA");
fprintf (out, "\n");
}
}
if (pe_def_file->num_imports > 0)
{
fprintf (out, "\nIMPORTS\n\n");
for (i = 0; i < pe_def_file->num_imports; i++)
{
def_file_import *im = pe_def_file->imports + i;
fprintf (out, " ");
if (im->internal_name
&& (!im->name || strcmp (im->internal_name, im->name)))
{
quoteput (im->internal_name, out, 0);
fprintf (out, " = ");
}
quoteput (im->module->name, out, 0);
fprintf (out, ".");
if (im->name)
quoteput (im->name, out, 0);
else
fprintf (out, "%d", im->ordinal);
fprintf (out, "\n");
}
}
}
else
fprintf (out, _("; no contents available\n"));
if (fclose (out) == EOF)
/* xgettext:c-format */
einfo (_("%P: Error closing file `%s'\n"), pe_out_def_filename);
}
/* Generate the import library. */
static asymbol **symtab;
static int symptr;
static int tmp_seq;
static const char *dll_filename;
static char *dll_symname;
#define UNDSEC (asection *) &bfd_und_section
static asection *
quick_section (abfd, name, flags, align)
bfd *abfd;
const char *name;
int flags;
int align;
{
asection *sec;
asymbol *sym;
sec = bfd_make_section_old_way (abfd, name);
bfd_set_section_flags (abfd, sec, flags | SEC_ALLOC | SEC_LOAD | SEC_KEEP);
bfd_set_section_alignment (abfd, sec, align);
/* Remember to undo this before trying to link internally! */
sec->output_section = sec;
sym = bfd_make_empty_symbol (abfd);
symtab[symptr++] = sym;
sym->name = sec->name;
sym->section = sec;
sym->flags = BSF_LOCAL;
sym->value = 0;
return sec;
}
static void
quick_symbol (abfd, n1, n2, n3, sec, flags, addr)
bfd *abfd;
const char *n1;
const char *n2;
const char *n3;
asection *sec;
int flags;
int addr;
{
asymbol *sym;
char *name = (char *) xmalloc (strlen (n1) + strlen (n2) + strlen (n3) + 1);
strcpy (name, n1);
strcat (name, n2);
strcat (name, n3);
sym = bfd_make_empty_symbol (abfd);
sym->name = name;
sym->section = sec;
sym->flags = flags;
sym->value = addr;
symtab[symptr++] = sym;
}
static arelent *reltab = 0;
static int relcount = 0, relsize = 0;
static void
quick_reloc (abfd, address, which_howto, symidx)
bfd *abfd;
int address;
int which_howto;
int symidx;
{
if (relcount >= (relsize - 1))
{
relsize += 10;
if (reltab)
reltab = (arelent *) xrealloc (reltab, relsize * sizeof (arelent));
else
reltab = (arelent *) xmalloc (relsize * sizeof (arelent));
}
reltab[relcount].address = address;
reltab[relcount].addend = 0;
reltab[relcount].howto = bfd_reloc_type_lookup (abfd, which_howto);
reltab[relcount].sym_ptr_ptr = symtab + symidx;
relcount++;
}
static void
save_relocs (asection *sec)
{
int i;
sec->relocation = reltab;
sec->reloc_count = relcount;
sec->orelocation = (arelent **) xmalloc ((relcount + 1) * sizeof (arelent *));
for (i = 0; i < relcount; i++)
sec->orelocation[i] = sec->relocation + i;
sec->orelocation[relcount] = 0;
sec->flags |= SEC_RELOC;
reltab = 0;
relcount = relsize = 0;
}
/* .section .idata$2
.global __head_my_dll
__head_my_dll:
.rva hname
.long 0
.long 0
.rva __my_dll_iname
.rva fthunk
.section .idata$5
.long 0
fthunk:
.section .idata$4
.long 0
hname: */
static bfd *
make_head (parent)
bfd *parent;
{
asection *id2, *id5, *id4;
unsigned char *d2, *d5, *d4;
char *oname;
bfd *abfd;
oname = (char *) xmalloc (20);
sprintf (oname, "d%06d.o", tmp_seq);
tmp_seq++;
abfd = bfd_create (oname, parent);
bfd_find_target (pe_details->object_target, abfd);
bfd_make_writable (abfd);
bfd_set_format (abfd, bfd_object);
bfd_set_arch_mach (abfd, pe_details->bfd_arch, 0);
symptr = 0;
symtab = (asymbol **) xmalloc (6 * sizeof (asymbol *));
id2 = quick_section (abfd, ".idata$2", SEC_HAS_CONTENTS, 2);
id5 = quick_section (abfd, ".idata$5", SEC_HAS_CONTENTS, 2);
id4 = quick_section (abfd, ".idata$4", SEC_HAS_CONTENTS, 2);
quick_symbol (abfd, U ("_head_"), dll_symname, "", id2, BSF_GLOBAL, 0);
quick_symbol (abfd, U (""), dll_symname, "_iname", UNDSEC, BSF_GLOBAL, 0);
/* OK, pay attention here. I got confused myself looking back at
it. We create a four-byte section to mark the beginning of the
list, and we include an offset of 4 in the section, so that the
pointer to the list points to the *end* of this section, which is
the start of the list of sections from other objects. */
bfd_set_section_size (abfd, id2, 20);
d2 = (unsigned char *) xmalloc (20);
id2->contents = d2;
memset (d2, 0, 20);
d2[0] = d2[16] = 4; /* Reloc addend. */
quick_reloc (abfd, 0, BFD_RELOC_RVA, 2);
quick_reloc (abfd, 12, BFD_RELOC_RVA, 4);
quick_reloc (abfd, 16, BFD_RELOC_RVA, 1);
save_relocs (id2);
bfd_set_section_size (abfd, id5, 4);
d5 = (unsigned char *) xmalloc (4);
id5->contents = d5;
memset (d5, 0, 4);
bfd_set_section_size (abfd, id4, 4);
d4 = (unsigned char *) xmalloc (4);
id4->contents = d4;
memset (d4, 0, 4);
bfd_set_symtab (abfd, symtab, symptr);
bfd_set_section_contents (abfd, id2, d2, 0, 20);
bfd_set_section_contents (abfd, id5, d5, 0, 4);
bfd_set_section_contents (abfd, id4, d4, 0, 4);
bfd_make_readable (abfd);
return abfd;
}
/* .section .idata$4
.long 0
.section .idata$5
.long 0
.section idata$7
.global __my_dll_iname
__my_dll_iname:
.asciz "my.dll" */
static bfd *
make_tail (parent)
bfd *parent;
{
asection *id4, *id5, *id7;
unsigned char *d4, *d5, *d7;
int len;
char *oname;
bfd *abfd;
oname = (char *) xmalloc (20);
sprintf (oname, "d%06d.o", tmp_seq);
tmp_seq++;
abfd = bfd_create (oname, parent);
bfd_find_target (pe_details->object_target, abfd);
bfd_make_writable (abfd);
bfd_set_format (abfd, bfd_object);
bfd_set_arch_mach (abfd, pe_details->bfd_arch, 0);
symptr = 0;
symtab = (asymbol **) xmalloc (5 * sizeof (asymbol *));
id4 = quick_section (abfd, ".idata$4", SEC_HAS_CONTENTS, 2);
id5 = quick_section (abfd, ".idata$5", SEC_HAS_CONTENTS, 2);
id7 = quick_section (abfd, ".idata$7", SEC_HAS_CONTENTS, 2);
quick_symbol (abfd, U (""), dll_symname, "_iname", id7, BSF_GLOBAL, 0);
bfd_set_section_size (abfd, id4, 4);
d4 = (unsigned char *) xmalloc (4);
id4->contents = d4;
memset (d4, 0, 4);
bfd_set_section_size (abfd, id5, 4);
d5 = (unsigned char *) xmalloc (4);
id5->contents = d5;
memset (d5, 0, 4);
len = strlen (dll_filename) + 1;
if (len & 1)
len++;
bfd_set_section_size (abfd, id7, len);
d7 = (unsigned char *) xmalloc (len);
id7->contents = d7;
strcpy (d7, dll_filename);
bfd_set_symtab (abfd, symtab, symptr);
bfd_set_section_contents (abfd, id4, d4, 0, 4);
bfd_set_section_contents (abfd, id5, d5, 0, 4);
bfd_set_section_contents (abfd, id7, d7, 0, len);
bfd_make_readable (abfd);
return abfd;
}
/* .text
.global _function
.global ___imp_function
.global __imp__function
_function:
jmp *__imp__function:
.section idata$7
.long __head_my_dll
.section .idata$5
___imp_function:
__imp__function:
iat?
.section .idata$4
iat?
.section .idata$6
ID<ordinal>:
.short <hint>
.asciz "function" xlate? (add underscore, kill at) */
static unsigned char jmp_ix86_bytes[] =
{
0xff, 0x25, 0x00, 0x00, 0x00, 0x00, 0x90, 0x90
};
/* _function:
mov.l ip+8,r0
mov.l @r0,r0
jmp @r0
nop
.dw __imp_function */
static unsigned char jmp_sh_bytes[] =
{
0x01, 0xd0, 0x02, 0x60, 0x2b, 0x40, 0x09, 0x00, 0x00, 0x00, 0x00, 0x00
};
/* _function:
lui $t0,<high:__imp_function>
lw $t0,<low:__imp_function>
jr $t0
nop */
static unsigned char jmp_mips_bytes[] =
{
0x00, 0x00, 0x08, 0x3c, 0x00, 0x00, 0x08, 0x8d,
0x08, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00
};
static bfd *
make_one (exp, parent)
def_file_export *exp;
bfd *parent;
{
asection *tx, *id7, *id5, *id4, *id6;
unsigned char *td = NULL, *d7, *d5, *d4, *d6 = NULL;
int len;
char *oname;
bfd *abfd;
unsigned char *jmp_bytes = NULL;
int jmp_byte_count = 0;
switch (pe_details->pe_arch)
{
case PE_ARCH_i386:
jmp_bytes = jmp_ix86_bytes;
jmp_byte_count = sizeof (jmp_ix86_bytes);
break;
case PE_ARCH_sh:
jmp_bytes = jmp_sh_bytes;
jmp_byte_count = sizeof (jmp_sh_bytes);
break;
case PE_ARCH_mips:
jmp_bytes = jmp_mips_bytes;
jmp_byte_count = sizeof (jmp_mips_bytes);
break;
default:
abort ();
}
oname = (char *) xmalloc (20);
sprintf (oname, "d%06d.o", tmp_seq);
tmp_seq++;
abfd = bfd_create (oname, parent);
bfd_find_target (pe_details->object_target, abfd);
bfd_make_writable (abfd);
bfd_set_format (abfd, bfd_object);
bfd_set_arch_mach (abfd, pe_details->bfd_arch, 0);
symptr = 0;
symtab = (asymbol **) xmalloc (11 * sizeof (asymbol *));
tx = quick_section (abfd, ".text", SEC_CODE|SEC_HAS_CONTENTS, 2);
id7 = quick_section (abfd, ".idata$7", SEC_HAS_CONTENTS, 2);
id5 = quick_section (abfd, ".idata$5", SEC_HAS_CONTENTS, 2);
id4 = quick_section (abfd, ".idata$4", SEC_HAS_CONTENTS, 2);
id6 = quick_section (abfd, ".idata$6", SEC_HAS_CONTENTS, 2);
if (! exp->flag_data)
quick_symbol (abfd, U (""), exp->internal_name, "", tx, BSF_GLOBAL, 0);
quick_symbol (abfd, U ("_head_"), dll_symname, "", UNDSEC, BSF_GLOBAL, 0);
quick_symbol (abfd, U ("_imp__"), exp->internal_name, "", id5, BSF_GLOBAL, 0);
/* Symbol to reference ord/name of imported
symbol, used to implement auto-import. */
quick_symbol (abfd, U("_nm__"), exp->internal_name, "", id6, BSF_GLOBAL, 0);
if (pe_dll_compat_implib)
quick_symbol (abfd, U ("__imp_"), exp->internal_name, "",
id5, BSF_GLOBAL, 0);
if (! exp->flag_data)
{
bfd_set_section_size (abfd, tx, jmp_byte_count);
td = (unsigned char *) xmalloc (jmp_byte_count);
tx->contents = td;
memcpy (td, jmp_bytes, jmp_byte_count);
switch (pe_details->pe_arch)
{
case PE_ARCH_i386:
quick_reloc (abfd, 2, BFD_RELOC_32, 2);
break;
case PE_ARCH_sh:
quick_reloc (abfd, 8, BFD_RELOC_32, 2);
break;
case PE_ARCH_mips:
quick_reloc (abfd, 0, BFD_RELOC_HI16_S, 2);
quick_reloc (abfd, 0, BFD_RELOC_LO16, 0); /* MIPS_R_PAIR */
quick_reloc (abfd, 4, BFD_RELOC_LO16, 2);
break;
default:
abort ();
}
save_relocs (tx);
}
bfd_set_section_size (abfd, id7, 4);
d7 = (unsigned char *) xmalloc (4);
id7->contents = d7;
memset (d7, 0, 4);
quick_reloc (abfd, 0, BFD_RELOC_RVA, 6);
save_relocs (id7);
bfd_set_section_size (abfd, id5, 4);
d5 = (unsigned char *) xmalloc (4);
id5->contents = d5;
memset (d5, 0, 4);
if (exp->flag_noname)
{
d5[0] = exp->ordinal;
d5[1] = exp->ordinal >> 8;
d5[3] = 0x80;
}
else
{
quick_reloc (abfd, 0, BFD_RELOC_RVA, 4);
save_relocs (id5);
}
bfd_set_section_size (abfd, id4, 4);
d4 = (unsigned char *) xmalloc (4);
id4->contents = d4;
memset (d4, 0, 4);
if (exp->flag_noname)
{
d4[0] = exp->ordinal;
d4[1] = exp->ordinal >> 8;
d4[3] = 0x80;
}
else
{
quick_reloc (abfd, 0, BFD_RELOC_RVA, 4);
save_relocs (id4);
}
if (exp->flag_noname)
{
len = 0;
bfd_set_section_size (abfd, id6, 0);
}
else
{
len = strlen (exp->name) + 3;
if (len & 1)
len++;
bfd_set_section_size (abfd, id6, len);
d6 = (unsigned char *) xmalloc (len);
id6->contents = d6;
memset (d6, 0, len);
d6[0] = exp->hint & 0xff;
d6[1] = exp->hint >> 8;
strcpy (d6 + 2, exp->name);
}
bfd_set_symtab (abfd, symtab, symptr);
bfd_set_section_contents (abfd, tx, td, 0, jmp_byte_count);
bfd_set_section_contents (abfd, id7, d7, 0, 4);
bfd_set_section_contents (abfd, id5, d5, 0, 4);
bfd_set_section_contents (abfd, id4, d4, 0, 4);
if (!exp->flag_noname)
bfd_set_section_contents (abfd, id6, d6, 0, len);
bfd_make_readable (abfd);
return abfd;
}
static bfd *
make_singleton_name_thunk (import, parent)
const char *import;
bfd *parent;
{
/* Name thunks go to idata$4. */
asection *id4;
unsigned char *d4;
char *oname;
bfd *abfd;
oname = (char *) xmalloc (20);
sprintf (oname, "nmth%06d.o", tmp_seq);
tmp_seq++;
abfd = bfd_create (oname, parent);
bfd_find_target (pe_details->object_target, abfd);
bfd_make_writable (abfd);
bfd_set_format (abfd, bfd_object);
bfd_set_arch_mach (abfd, pe_details->bfd_arch, 0);
symptr = 0;
symtab = (asymbol **) xmalloc (3 * sizeof (asymbol *));
id4 = quick_section (abfd, ".idata$4", SEC_HAS_CONTENTS, 2);
quick_symbol (abfd, U ("_nm_thnk_"), import, "", id4, BSF_GLOBAL, 0);
quick_symbol (abfd, U ("_nm_"), import, "", UNDSEC, BSF_GLOBAL, 0);
bfd_set_section_size (abfd, id4, 8);
d4 = (unsigned char *) xmalloc (4);
id4->contents = d4;
memset (d4, 0, 8);
quick_reloc (abfd, 0, BFD_RELOC_RVA, 2);
save_relocs (id4);
bfd_set_symtab (abfd, symtab, symptr);
bfd_set_section_contents (abfd, id4, d4, 0, 8);
bfd_make_readable (abfd);
return abfd;
}
static char *
make_import_fixup_mark (rel)
arelent *rel;
{
/* We convert reloc to symbol, for later reference. */
static int counter;
static char *fixup_name = NULL;
static size_t buffer_len = 0;
struct symbol_cache_entry *sym = *rel->sym_ptr_ptr;
bfd *abfd = bfd_asymbol_bfd (sym);
struct coff_link_hash_entry *myh = NULL;
if (!fixup_name)
{
fixup_name = (char *) xmalloc (384);
buffer_len = 384;
}
if (strlen (sym->name) + 25 > buffer_len)
/* Assume 25 chars for "__fu" + counter + "_". If counter is
bigger than 20 digits long, we've got worse problems than
overflowing this buffer... */
{
free (fixup_name);
/* New buffer size is length of symbol, plus 25, but then
rounded up to the nearest multiple of 128. */
buffer_len = ((strlen (sym->name) + 25) + 127) & ~127;
fixup_name = (char *) xmalloc (buffer_len);
}
sprintf (fixup_name, "__fu%d_%s", counter++, sym->name);
bfd_coff_link_add_one_symbol (&link_info, abfd, fixup_name, BSF_GLOBAL,
current_sec, /* sym->section, */
rel->address, NULL, true, false,
(struct bfd_link_hash_entry **) &myh);
#if 0
printf ("type:%d\n", myh->type);
printf ("%s\n", myh->root.u.def.section->name);
#endif
return fixup_name;
}
/* .section .idata$3
.rva __nm_thnk_SYM (singleton thunk with name of func)
.long 0
.long 0
.rva __my_dll_iname (name of dll)
.rva __fuNN_SYM (pointer to reference (address) in text) */
static bfd *
make_import_fixup_entry (name, fixup_name, dll_symname,parent)
const char *name;
const char *fixup_name;
const char *dll_symname;
bfd *parent;
{
asection *id3;
unsigned char *d3;
char *oname;
bfd *abfd;
oname = (char *) xmalloc (20);
sprintf (oname, "fu%06d.o", tmp_seq);
tmp_seq++;
abfd = bfd_create (oname, parent);
bfd_find_target (pe_details->object_target, abfd);
bfd_make_writable (abfd);
bfd_set_format (abfd, bfd_object);
bfd_set_arch_mach (abfd, pe_details->bfd_arch, 0);
symptr = 0;
symtab = (asymbol **) xmalloc (6 * sizeof (asymbol *));
id3 = quick_section (abfd, ".idata$3", SEC_HAS_CONTENTS, 2);
#if 0
quick_symbol (abfd, U ("_head_"), dll_symname, "", id2, BSF_GLOBAL, 0);
#endif
quick_symbol (abfd, U ("_nm_thnk_"), name, "", UNDSEC, BSF_GLOBAL, 0);
quick_symbol (abfd, U (""), dll_symname, "_iname", UNDSEC, BSF_GLOBAL, 0);
quick_symbol (abfd, "", fixup_name, "", UNDSEC, BSF_GLOBAL, 0);
bfd_set_section_size (abfd, id3, 20);
d3 = (unsigned char *) xmalloc (20);
id3->contents = d3;
memset (d3, 0, 20);
quick_reloc (abfd, 0, BFD_RELOC_RVA, 1);
quick_reloc (abfd, 12, BFD_RELOC_RVA, 2);
quick_reloc (abfd, 16, BFD_RELOC_RVA, 3);
save_relocs (id3);
bfd_set_symtab (abfd, symtab, symptr);
bfd_set_section_contents (abfd, id3, d3, 0, 20);
bfd_make_readable (abfd);
return abfd;
}
void
pe_create_import_fixup (rel)
arelent *rel;
{
char buf[300];
struct symbol_cache_entry *sym = *rel->sym_ptr_ptr;
struct bfd_link_hash_entry *name_thunk_sym;
const char *name = sym->name;
char *fixup_name = make_import_fixup_mark (rel);
sprintf (buf, U ("_nm_thnk_%s"), name);
name_thunk_sym = bfd_link_hash_lookup (link_info.hash, buf, 0, 0, 1);
if (!name_thunk_sym || name_thunk_sym->type != bfd_link_hash_defined)
{
bfd *b = make_singleton_name_thunk (name, output_bfd);
add_bfd_to_link (b, b->filename, &link_info);
/* If we ever use autoimport, we have to cast text section writable. */
config.text_read_only = false;
}
{
extern char * pe_data_import_dll; /* Defined in emultempl/pe.em. */
bfd *b = make_import_fixup_entry (name, fixup_name, pe_data_import_dll,
output_bfd);
add_bfd_to_link (b, b->filename, &link_info);
}
}
void
pe_dll_generate_implib (def, impfilename)
def_file *def;
const char *impfilename;
{
int i;
bfd *ar_head;
bfd *ar_tail;
bfd *outarch;
bfd *head = 0;
dll_filename = (def->name) ? def->name : dll_name;
dll_symname = xstrdup (dll_filename);
for (i = 0; dll_symname[i]; i++)
if (!ISALNUM (dll_symname[i]))
dll_symname[i] = '_';
unlink (impfilename);
outarch = bfd_openw (impfilename, 0);
if (!outarch)
{
/* xgettext:c-format */
einfo (_("%XCan't open .lib file: %s\n"), impfilename);
return;
}
/* xgettext:c-format */
einfo (_("Creating library file: %s\n"), impfilename);
bfd_set_format (outarch, bfd_archive);
outarch->has_armap = 1;
/* Work out a reasonable size of things to put onto one line. */
ar_head = make_head (outarch);
for (i = 0; i < def->num_exports; i++)
{
/* The import library doesn't know about the internal name. */
char *internal = def->exports[i].internal_name;
bfd *n;
def->exports[i].internal_name = def->exports[i].name;
n = make_one (def->exports + i, outarch);
n->next = head;
head = n;
def->exports[i].internal_name = internal;
}
ar_tail = make_tail (outarch);
if (ar_head == NULL || ar_tail == NULL)
return;
/* Now stick them all into the archive. */
ar_head->next = head;
ar_tail->next = ar_head;
head = ar_tail;
if (! bfd_set_archive_head (outarch, head))
einfo ("%Xbfd_set_archive_head: %s\n", bfd_errmsg (bfd_get_error ()));
if (! bfd_close (outarch))
einfo ("%Xbfd_close %s: %s\n", impfilename, bfd_errmsg (bfd_get_error ()));
while (head != NULL)
{
bfd *n = head->next;
bfd_close (head);
head = n;
}
}
static void
add_bfd_to_link (abfd, name, link_info)
bfd *abfd;
const char *name;
struct bfd_link_info *link_info;
{
lang_input_statement_type *fake_file;
fake_file = lang_add_input_file (name,
lang_input_file_is_fake_enum,
NULL);
fake_file->the_bfd = abfd;
ldlang_add_file (fake_file);
if (!bfd_link_add_symbols (abfd, link_info))
einfo ("%Xaddsym %s: %s\n", name, bfd_errmsg (bfd_get_error ()));
}
void
pe_process_import_defs (output_bfd, link_info)
bfd *output_bfd;
struct bfd_link_info *link_info;
{
def_file_module *module;
pe_dll_id_target (bfd_get_target (output_bfd));
if (!pe_def_file)
return;
for (module = pe_def_file->modules; module; module = module->next)
{
int i, do_this_dll;
dll_filename = module->name;
dll_symname = xstrdup (module->name);
for (i = 0; dll_symname[i]; i++)
if (!ISALNUM (dll_symname[i]))
dll_symname[i] = '_';
do_this_dll = 0;
for (i = 0; i < pe_def_file->num_imports; i++)
if (pe_def_file->imports[i].module == module)
{
def_file_export exp;
struct bfd_link_hash_entry *blhe;
/* See if we need this import. */
char *name = (char *) xmalloc (strlen (pe_def_file->imports[i].internal_name) + 2 + 6);
sprintf (name, "%s%s", U (""), pe_def_file->imports[i].internal_name);
blhe = bfd_link_hash_lookup (link_info->hash, name,
false, false, false);
if (!blhe || (blhe && blhe->type != bfd_link_hash_undefined))
{
sprintf (name, "%s%s", U ("_imp__"),
pe_def_file->imports[i].internal_name);
blhe = bfd_link_hash_lookup (link_info->hash, name,
false, false, false);
}
free (name);
if (blhe && blhe->type == bfd_link_hash_undefined)
{
bfd *one;
/* We do. */
if (!do_this_dll)
{
bfd *ar_head = make_head (output_bfd);
add_bfd_to_link (ar_head, ar_head->filename, link_info);
do_this_dll = 1;
}
exp.internal_name = pe_def_file->imports[i].internal_name;
exp.name = pe_def_file->imports[i].name;
exp.ordinal = pe_def_file->imports[i].ordinal;
exp.hint = exp.ordinal >= 0 ? exp.ordinal : 0;
exp.flag_private = 0;
exp.flag_constant = 0;
exp.flag_data = 0;
exp.flag_noname = exp.name ? 0 : 1;
one = make_one (&exp, output_bfd);
add_bfd_to_link (one, one->filename, link_info);
}
}
if (do_this_dll)
{
bfd *ar_tail = make_tail (output_bfd);
add_bfd_to_link (ar_tail, ar_tail->filename, link_info);
}
free (dll_symname);
}
}
/* We were handed a *.DLL file. Parse it and turn it into a set of
IMPORTS directives in the def file. Return true if the file was
handled, false if not. */
static unsigned int
pe_get16 (abfd, where)
bfd *abfd;
int where;
{
unsigned char b[2];
bfd_seek (abfd, (file_ptr) where, SEEK_SET);
bfd_bread (b, (bfd_size_type) 2, abfd);
return b[0] + (b[1] << 8);
}
static unsigned int
pe_get32 (abfd, where)
bfd *abfd;
int where;
{
unsigned char b[4];
bfd_seek (abfd, (file_ptr) where, SEEK_SET);
bfd_bread (b, (bfd_size_type) 4, abfd);
return b[0] + (b[1] << 8) + (b[2] << 16) + (b[3] << 24);
}
#if 0 /* This is not currently used. */
static unsigned int
pe_as16 (ptr)
void *ptr;
{
unsigned char *b = ptr;
return b[0] + (b[1] << 8);
}
#endif
static unsigned int
pe_as32 (ptr)
void *ptr;
{
unsigned char *b = ptr;
return b[0] + (b[1] << 8) + (b[2] << 16) + (b[3] << 24);
}
boolean
pe_implied_import_dll (filename)
const char *filename;
{
bfd *dll;
unsigned long pe_header_offset, opthdr_ofs, num_entries, i;
unsigned long export_rva, export_size, nsections, secptr, expptr;
unsigned char *expdata, *erva;
unsigned long name_rvas, ordinals, nexp, ordbase;
const char *dll_name;
/* No, I can't use bfd here. kernel32.dll puts its export table in
the middle of the .rdata section. */
dll = bfd_openr (filename, pe_details->target_name);
if (!dll)
{
einfo ("%Xopen %s: %s\n", filename, bfd_errmsg (bfd_get_error ()));
return false;
}
/* PEI dlls seem to be bfd_objects. */
if (!bfd_check_format (dll, bfd_object))
{
einfo ("%X%s: this doesn't appear to be a DLL\n", filename);
return false;
}
dll_name = filename;
for (i = 0; filename[i]; i++)
if (filename[i] == '/' || filename[i] == '\\' || filename[i] == ':')
dll_name = filename + i + 1;
pe_header_offset = pe_get32 (dll, 0x3c);
opthdr_ofs = pe_header_offset + 4 + 20;
num_entries = pe_get32 (dll, opthdr_ofs + 92);
if (num_entries < 1) /* No exports. */
return false;
export_rva = pe_get32 (dll, opthdr_ofs + 96);
export_size = pe_get32 (dll, opthdr_ofs + 100);
nsections = pe_get16 (dll, pe_header_offset + 4 + 2);
secptr = (pe_header_offset + 4 + 20 +
pe_get16 (dll, pe_header_offset + 4 + 16));
expptr = 0;
for (i = 0; i < nsections; i++)
{
char sname[8];
unsigned long secptr1 = secptr + 40 * i;
unsigned long vaddr = pe_get32 (dll, secptr1 + 12);
unsigned long vsize = pe_get32 (dll, secptr1 + 16);
unsigned long fptr = pe_get32 (dll, secptr1 + 20);
bfd_seek (dll, (file_ptr) secptr1, SEEK_SET);
bfd_bread (sname, (bfd_size_type) 8, dll);
if (vaddr <= export_rva && vaddr + vsize > export_rva)
{
expptr = fptr + (export_rva - vaddr);
if (export_rva + export_size > vaddr + vsize)
export_size = vsize - (export_rva - vaddr);
break;
}
}
expdata = (unsigned char *) xmalloc (export_size);
bfd_seek (dll, (file_ptr) expptr, SEEK_SET);
bfd_bread (expdata, (bfd_size_type) export_size, dll);
erva = expdata - export_rva;
if (pe_def_file == 0)
pe_def_file = def_file_empty ();
nexp = pe_as32 (expdata + 24);
name_rvas = pe_as32 (expdata + 32);
ordinals = pe_as32 (expdata + 36);
ordbase = pe_as32 (expdata + 16);
for (i = 0; i < nexp; i++)
{
unsigned long name_rva = pe_as32 (erva + name_rvas + i * 4);
def_file_import *imp;
imp = def_file_add_import (pe_def_file, erva + name_rva, dll_name,
i, 0);
}
return true;
}
/* These are the main functions, called from the emulation. The first
is called after the bfds are read, so we can guess at how much space
we need. The second is called after everything is placed, so we
can put the right values in place. */
void
pe_dll_build_sections (abfd, info)
bfd *abfd;
struct bfd_link_info *info;
{
pe_dll_id_target (bfd_get_target (abfd));
process_def_file (abfd, info);
generate_edata (abfd, info);
build_filler_bfd (1);
}
void
pe_exe_build_sections (abfd, info)
bfd *abfd;
struct bfd_link_info *info ATTRIBUTE_UNUSED;
{
pe_dll_id_target (bfd_get_target (abfd));
build_filler_bfd (0);
}
void
pe_dll_fill_sections (abfd, info)
bfd *abfd;
struct bfd_link_info *info;
{
pe_dll_id_target (bfd_get_target (abfd));
image_base = pe_data (abfd)->pe_opthdr.ImageBase;
generate_reloc (abfd, info);
if (reloc_sz > 0)
{
bfd_set_section_size (filler_bfd, reloc_s, reloc_sz);
/* Resize the sections. */
lang_size_sections (stat_ptr->head, abs_output_section,
&stat_ptr->head, 0, (bfd_vma) 0, NULL);
/* Redo special stuff. */
ldemul_after_allocation ();
/* Do the assignments again. */
lang_do_assignments (stat_ptr->head,
abs_output_section,
(fill_type) 0, (bfd_vma) 0);
}
fill_edata (abfd, info);
pe_data (abfd)->dll = 1;
edata_s->contents = edata_d;
reloc_s->contents = reloc_d;
}
void
pe_exe_fill_sections (abfd, info)
bfd *abfd;
struct bfd_link_info *info;
{
pe_dll_id_target (bfd_get_target (abfd));
image_base = pe_data (abfd)->pe_opthdr.ImageBase;
generate_reloc (abfd, info);
if (reloc_sz > 0)
{
bfd_set_section_size (filler_bfd, reloc_s, reloc_sz);
/* Resize the sections. */
lang_size_sections (stat_ptr->head, abs_output_section,
&stat_ptr->head, 0, (bfd_vma) 0, NULL);
/* Redo special stuff. */
ldemul_after_allocation ();
/* Do the assignments again. */
lang_do_assignments (stat_ptr->head,
abs_output_section,
(fill_type) 0, (bfd_vma) 0);
}
reloc_s->contents = reloc_d;
}
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