/* Read the export table symbols from a portable executable and
|
/* Read the export table symbols from a portable executable and
|
convert to internal format, for GDB. Used as a last resort if no
|
convert to internal format, for GDB. Used as a last resort if no
|
debugging symbols recognized.
|
debugging symbols recognized.
|
|
|
Copyright (C) 2003, 2007, 2008 Free Software Foundation, Inc.
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Copyright (C) 2003, 2007, 2008 Free Software Foundation, Inc.
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|
|
This file is part of GDB.
|
This file is part of GDB.
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|
|
This program is free software; you can redistribute it and/or modify
|
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
|
it under the terms of the GNU General Public License as published by
|
the Free Software Foundation; either version 3 of the License, or
|
the Free Software Foundation; either version 3 of the License, or
|
(at your option) any later version.
|
(at your option) any later version.
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|
|
This program is distributed in the hope that it will be useful,
|
This program is distributed in the hope that it will be useful,
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
GNU General Public License for more details.
|
GNU General Public License for more details.
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|
|
You should have received a copy of the GNU General Public License
|
You should have received a copy of the GNU General Public License
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
Contributed by Raoul M. Gough (RaoulGough@yahoo.co.uk). */
|
Contributed by Raoul M. Gough (RaoulGough@yahoo.co.uk). */
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|
|
#include "coff-pe-read.h"
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#include "coff-pe-read.h"
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|
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#include "bfd.h"
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#include "bfd.h"
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|
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#include "defs.h"
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#include "defs.h"
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#include "gdbtypes.h"
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#include "gdbtypes.h"
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|
|
#include "symtab.h"
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#include "symtab.h"
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#include "symfile.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "objfiles.h"
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|
|
/* Internal section information */
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/* Internal section information */
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|
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struct read_pe_section_data
|
struct read_pe_section_data
|
{
|
{
|
CORE_ADDR vma_offset; /* Offset to loaded address of section. */
|
CORE_ADDR vma_offset; /* Offset to loaded address of section. */
|
unsigned long rva_start; /* Start offset within the pe. */
|
unsigned long rva_start; /* Start offset within the pe. */
|
unsigned long rva_end; /* End offset within the pe. */
|
unsigned long rva_end; /* End offset within the pe. */
|
enum minimal_symbol_type ms_type; /* Type to assign symbols in section. */
|
enum minimal_symbol_type ms_type; /* Type to assign symbols in section. */
|
};
|
};
|
|
|
#define PE_SECTION_INDEX_TEXT 0
|
#define PE_SECTION_INDEX_TEXT 0
|
#define PE_SECTION_INDEX_DATA 1
|
#define PE_SECTION_INDEX_DATA 1
|
#define PE_SECTION_INDEX_BSS 2
|
#define PE_SECTION_INDEX_BSS 2
|
#define PE_SECTION_TABLE_SIZE 3
|
#define PE_SECTION_TABLE_SIZE 3
|
#define PE_SECTION_INDEX_INVALID -1
|
#define PE_SECTION_INDEX_INVALID -1
|
|
|
/* Get the index of the named section in our own array, which contains
|
/* Get the index of the named section in our own array, which contains
|
text, data and bss in that order. Return PE_SECTION_INDEX_INVALID
|
text, data and bss in that order. Return PE_SECTION_INDEX_INVALID
|
if passed an unrecognised section name. */
|
if passed an unrecognised section name. */
|
|
|
static int
|
static int
|
read_pe_section_index (const char *section_name)
|
read_pe_section_index (const char *section_name)
|
{
|
{
|
if (strcmp (section_name, ".text") == 0)
|
if (strcmp (section_name, ".text") == 0)
|
{
|
{
|
return PE_SECTION_INDEX_TEXT;
|
return PE_SECTION_INDEX_TEXT;
|
}
|
}
|
|
|
else if (strcmp (section_name, ".data") == 0)
|
else if (strcmp (section_name, ".data") == 0)
|
{
|
{
|
return PE_SECTION_INDEX_DATA;
|
return PE_SECTION_INDEX_DATA;
|
}
|
}
|
|
|
else if (strcmp (section_name, ".bss") == 0)
|
else if (strcmp (section_name, ".bss") == 0)
|
{
|
{
|
return PE_SECTION_INDEX_BSS;
|
return PE_SECTION_INDEX_BSS;
|
}
|
}
|
|
|
else
|
else
|
{
|
{
|
return PE_SECTION_INDEX_INVALID;
|
return PE_SECTION_INDEX_INVALID;
|
}
|
}
|
}
|
}
|
|
|
/* Record the virtual memory address of a section. */
|
/* Record the virtual memory address of a section. */
|
|
|
static void
|
static void
|
get_section_vmas (bfd *abfd, asection *sectp, void *context)
|
get_section_vmas (bfd *abfd, asection *sectp, void *context)
|
{
|
{
|
struct read_pe_section_data *sections = context;
|
struct read_pe_section_data *sections = context;
|
int sectix = read_pe_section_index (sectp->name);
|
int sectix = read_pe_section_index (sectp->name);
|
|
|
if (sectix != PE_SECTION_INDEX_INVALID)
|
if (sectix != PE_SECTION_INDEX_INVALID)
|
{
|
{
|
/* Data within the section start at rva_start in the pe and at
|
/* Data within the section start at rva_start in the pe and at
|
bfd_get_section_vma() within memory. Store the offset. */
|
bfd_get_section_vma() within memory. Store the offset. */
|
|
|
sections[sectix].vma_offset
|
sections[sectix].vma_offset
|
= bfd_get_section_vma (abfd, sectp) - sections[sectix].rva_start;
|
= bfd_get_section_vma (abfd, sectp) - sections[sectix].rva_start;
|
}
|
}
|
}
|
}
|
|
|
/* Create a minimal symbol entry for an exported symbol. */
|
/* Create a minimal symbol entry for an exported symbol. */
|
|
|
static void
|
static void
|
add_pe_exported_sym (char *sym_name,
|
add_pe_exported_sym (char *sym_name,
|
unsigned long func_rva,
|
unsigned long func_rva,
|
const struct read_pe_section_data *section_data,
|
const struct read_pe_section_data *section_data,
|
const char *dll_name, struct objfile *objfile)
|
const char *dll_name, struct objfile *objfile)
|
{
|
{
|
/* Add the stored offset to get the loaded address of the symbol. */
|
/* Add the stored offset to get the loaded address of the symbol. */
|
|
|
CORE_ADDR vma = func_rva + section_data->vma_offset;
|
CORE_ADDR vma = func_rva + section_data->vma_offset;
|
|
|
char *qualified_name = 0;
|
char *qualified_name = 0;
|
int dll_name_len = strlen (dll_name);
|
int dll_name_len = strlen (dll_name);
|
int count;
|
int count;
|
|
|
/* Generate a (hopefully unique) qualified name using the first part
|
/* Generate a (hopefully unique) qualified name using the first part
|
of the dll name, e.g. KERNEL32!AddAtomA. This matches the style
|
of the dll name, e.g. KERNEL32!AddAtomA. This matches the style
|
used by windbg from the "Microsoft Debugging Tools for Windows". */
|
used by windbg from the "Microsoft Debugging Tools for Windows". */
|
|
|
qualified_name = xmalloc (dll_name_len + strlen (sym_name) + 2);
|
qualified_name = xmalloc (dll_name_len + strlen (sym_name) + 2);
|
|
|
strncpy (qualified_name, dll_name, dll_name_len);
|
strncpy (qualified_name, dll_name, dll_name_len);
|
qualified_name[dll_name_len] = '!';
|
qualified_name[dll_name_len] = '!';
|
strcpy (qualified_name + dll_name_len + 1, sym_name);
|
strcpy (qualified_name + dll_name_len + 1, sym_name);
|
|
|
prim_record_minimal_symbol (qualified_name,
|
prim_record_minimal_symbol (qualified_name,
|
vma, section_data->ms_type, objfile);
|
vma, section_data->ms_type, objfile);
|
|
|
xfree (qualified_name);
|
xfree (qualified_name);
|
|
|
/* Enter the plain name as well, which might not be unique. */
|
/* Enter the plain name as well, which might not be unique. */
|
prim_record_minimal_symbol (sym_name, vma, section_data->ms_type, objfile);
|
prim_record_minimal_symbol (sym_name, vma, section_data->ms_type, objfile);
|
}
|
}
|
|
|
/* Truncate a dll_name at the first dot character. */
|
/* Truncate a dll_name at the first dot character. */
|
|
|
static void
|
static void
|
read_pe_truncate_name (char *dll_name)
|
read_pe_truncate_name (char *dll_name)
|
{
|
{
|
while (*dll_name)
|
while (*dll_name)
|
{
|
{
|
if ((*dll_name) == '.')
|
if ((*dll_name) == '.')
|
{
|
{
|
*dll_name = '\0'; /* truncates and causes loop exit. */
|
*dll_name = '\0'; /* truncates and causes loop exit. */
|
}
|
}
|
|
|
else
|
else
|
{
|
{
|
++dll_name;
|
++dll_name;
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
/* Low-level support functions, direct from the ld module pe-dll.c. */
|
/* Low-level support functions, direct from the ld module pe-dll.c. */
|
static unsigned int
|
static unsigned int
|
pe_get16 (bfd *abfd, int where)
|
pe_get16 (bfd *abfd, int where)
|
{
|
{
|
unsigned char b[2];
|
unsigned char b[2];
|
|
|
bfd_seek (abfd, (file_ptr) where, SEEK_SET);
|
bfd_seek (abfd, (file_ptr) where, SEEK_SET);
|
bfd_bread (b, (bfd_size_type) 2, abfd);
|
bfd_bread (b, (bfd_size_type) 2, abfd);
|
return b[0] + (b[1] << 8);
|
return b[0] + (b[1] << 8);
|
}
|
}
|
|
|
static unsigned int
|
static unsigned int
|
pe_get32 (bfd *abfd, int where)
|
pe_get32 (bfd *abfd, int where)
|
{
|
{
|
unsigned char b[4];
|
unsigned char b[4];
|
|
|
bfd_seek (abfd, (file_ptr) where, SEEK_SET);
|
bfd_seek (abfd, (file_ptr) where, SEEK_SET);
|
bfd_bread (b, (bfd_size_type) 4, abfd);
|
bfd_bread (b, (bfd_size_type) 4, abfd);
|
return b[0] + (b[1] << 8) + (b[2] << 16) + (b[3] << 24);
|
return b[0] + (b[1] << 8) + (b[2] << 16) + (b[3] << 24);
|
}
|
}
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|
|
static unsigned int
|
static unsigned int
|
pe_as32 (void *ptr)
|
pe_as32 (void *ptr)
|
{
|
{
|
unsigned char *b = ptr;
|
unsigned char *b = ptr;
|
|
|
return b[0] + (b[1] << 8) + (b[2] << 16) + (b[3] << 24);
|
return b[0] + (b[1] << 8) + (b[2] << 16) + (b[3] << 24);
|
}
|
}
|
|
|
/* Read the (non-debug) export symbol table from a portable
|
/* Read the (non-debug) export symbol table from a portable
|
executable. Code originally lifted from the ld function
|
executable. Code originally lifted from the ld function
|
pe_implied_import_dll in pe-dll.c. */
|
pe_implied_import_dll in pe-dll.c. */
|
|
|
void
|
void
|
read_pe_exported_syms (struct objfile *objfile)
|
read_pe_exported_syms (struct objfile *objfile)
|
{
|
{
|
bfd *dll = objfile->obfd;
|
bfd *dll = objfile->obfd;
|
unsigned long pe_header_offset, opthdr_ofs, num_entries, i;
|
unsigned long pe_header_offset, opthdr_ofs, num_entries, i;
|
unsigned long export_rva, export_size, nsections, secptr, expptr;
|
unsigned long export_rva, export_size, nsections, secptr, expptr;
|
unsigned long exp_funcbase;
|
unsigned long exp_funcbase;
|
unsigned char *expdata, *erva;
|
unsigned char *expdata, *erva;
|
unsigned long name_rvas, ordinals, nexp, ordbase;
|
unsigned long name_rvas, ordinals, nexp, ordbase;
|
char *dll_name;
|
char *dll_name;
|
|
|
/* Array elements are for text, data and bss in that order
|
/* Array elements are for text, data and bss in that order
|
Initialization with start_rva > end_rva guarantees that
|
Initialization with start_rva > end_rva guarantees that
|
unused sections won't be matched. */
|
unused sections won't be matched. */
|
struct read_pe_section_data section_data[PE_SECTION_TABLE_SIZE]
|
struct read_pe_section_data section_data[PE_SECTION_TABLE_SIZE]
|
= { {0, 1, 0, mst_text},
|
= { {0, 1, 0, mst_text},
|
{0, 1, 0, mst_data},
|
{0, 1, 0, mst_data},
|
{0, 1, 0, mst_bss}
|
{0, 1, 0, mst_bss}
|
};
|
};
|
|
|
struct cleanup *back_to = 0;
|
struct cleanup *back_to = 0;
|
|
|
char const *target = bfd_get_target (objfile->obfd);
|
char const *target = bfd_get_target (objfile->obfd);
|
|
|
if ((strcmp (target, "pe-i386") != 0) && (strcmp (target, "pei-i386") != 0))
|
if ((strcmp (target, "pe-i386") != 0) && (strcmp (target, "pei-i386") != 0))
|
{
|
{
|
/* This is not an i386 format file. Abort now, because the code
|
/* This is not an i386 format file. Abort now, because the code
|
is untested on anything else. *FIXME* test on further
|
is untested on anything else. *FIXME* test on further
|
architectures and loosen or remove this test. */
|
architectures and loosen or remove this test. */
|
return;
|
return;
|
}
|
}
|
|
|
/* Get pe_header, optional header and numbers of export entries. */
|
/* Get pe_header, optional header and numbers of export entries. */
|
pe_header_offset = pe_get32 (dll, 0x3c);
|
pe_header_offset = pe_get32 (dll, 0x3c);
|
opthdr_ofs = pe_header_offset + 4 + 20;
|
opthdr_ofs = pe_header_offset + 4 + 20;
|
num_entries = pe_get32 (dll, opthdr_ofs + 92);
|
num_entries = pe_get32 (dll, opthdr_ofs + 92);
|
|
|
if (num_entries < 1) /* No exports. */
|
if (num_entries < 1) /* No exports. */
|
{
|
{
|
return;
|
return;
|
}
|
}
|
|
|
export_rva = pe_get32 (dll, opthdr_ofs + 96);
|
export_rva = pe_get32 (dll, opthdr_ofs + 96);
|
export_size = pe_get32 (dll, opthdr_ofs + 100);
|
export_size = pe_get32 (dll, opthdr_ofs + 100);
|
nsections = pe_get16 (dll, pe_header_offset + 4 + 2);
|
nsections = pe_get16 (dll, pe_header_offset + 4 + 2);
|
secptr = (pe_header_offset + 4 + 20 +
|
secptr = (pe_header_offset + 4 + 20 +
|
pe_get16 (dll, pe_header_offset + 4 + 16));
|
pe_get16 (dll, pe_header_offset + 4 + 16));
|
expptr = 0;
|
expptr = 0;
|
|
|
/* Get the rva and size of the export section. */
|
/* Get the rva and size of the export section. */
|
for (i = 0; i < nsections; i++)
|
for (i = 0; i < nsections; i++)
|
{
|
{
|
char sname[8];
|
char sname[8];
|
unsigned long secptr1 = secptr + 40 * i;
|
unsigned long secptr1 = secptr + 40 * i;
|
unsigned long vaddr = pe_get32 (dll, secptr1 + 12);
|
unsigned long vaddr = pe_get32 (dll, secptr1 + 12);
|
unsigned long vsize = pe_get32 (dll, secptr1 + 16);
|
unsigned long vsize = pe_get32 (dll, secptr1 + 16);
|
unsigned long fptr = pe_get32 (dll, secptr1 + 20);
|
unsigned long fptr = pe_get32 (dll, secptr1 + 20);
|
|
|
bfd_seek (dll, (file_ptr) secptr1, SEEK_SET);
|
bfd_seek (dll, (file_ptr) secptr1, SEEK_SET);
|
bfd_bread (sname, (bfd_size_type) 8, dll);
|
bfd_bread (sname, (bfd_size_type) 8, dll);
|
|
|
if (vaddr <= export_rva && vaddr + vsize > export_rva)
|
if (vaddr <= export_rva && vaddr + vsize > export_rva)
|
{
|
{
|
expptr = fptr + (export_rva - vaddr);
|
expptr = fptr + (export_rva - vaddr);
|
if (export_rva + export_size > vaddr + vsize)
|
if (export_rva + export_size > vaddr + vsize)
|
export_size = vsize - (export_rva - vaddr);
|
export_size = vsize - (export_rva - vaddr);
|
break;
|
break;
|
}
|
}
|
}
|
}
|
|
|
if (export_size == 0)
|
if (export_size == 0)
|
{
|
{
|
/* Empty export table. */
|
/* Empty export table. */
|
return;
|
return;
|
}
|
}
|
|
|
/* Scan sections and store the base and size of the relevant sections. */
|
/* Scan sections and store the base and size of the relevant sections. */
|
for (i = 0; i < nsections; i++)
|
for (i = 0; i < nsections; i++)
|
{
|
{
|
unsigned long secptr1 = secptr + 40 * i;
|
unsigned long secptr1 = secptr + 40 * i;
|
unsigned long vsize = pe_get32 (dll, secptr1 + 8);
|
unsigned long vsize = pe_get32 (dll, secptr1 + 8);
|
unsigned long vaddr = pe_get32 (dll, secptr1 + 12);
|
unsigned long vaddr = pe_get32 (dll, secptr1 + 12);
|
unsigned long flags = pe_get32 (dll, secptr1 + 36);
|
unsigned long flags = pe_get32 (dll, secptr1 + 36);
|
char sec_name[9];
|
char sec_name[9];
|
int sectix;
|
int sectix;
|
|
|
sec_name[8] = '\0';
|
sec_name[8] = '\0';
|
bfd_seek (dll, (file_ptr) secptr1 + 0, SEEK_SET);
|
bfd_seek (dll, (file_ptr) secptr1 + 0, SEEK_SET);
|
bfd_bread (sec_name, (bfd_size_type) 8, dll);
|
bfd_bread (sec_name, (bfd_size_type) 8, dll);
|
|
|
sectix = read_pe_section_index (sec_name);
|
sectix = read_pe_section_index (sec_name);
|
|
|
if (sectix != PE_SECTION_INDEX_INVALID)
|
if (sectix != PE_SECTION_INDEX_INVALID)
|
{
|
{
|
section_data[sectix].rva_start = vaddr;
|
section_data[sectix].rva_start = vaddr;
|
section_data[sectix].rva_end = vaddr + vsize;
|
section_data[sectix].rva_end = vaddr + vsize;
|
}
|
}
|
}
|
}
|
|
|
expdata = (unsigned char *) xmalloc (export_size);
|
expdata = (unsigned char *) xmalloc (export_size);
|
back_to = make_cleanup (xfree, expdata);
|
back_to = make_cleanup (xfree, expdata);
|
|
|
bfd_seek (dll, (file_ptr) expptr, SEEK_SET);
|
bfd_seek (dll, (file_ptr) expptr, SEEK_SET);
|
bfd_bread (expdata, (bfd_size_type) export_size, dll);
|
bfd_bread (expdata, (bfd_size_type) export_size, dll);
|
erva = expdata - export_rva;
|
erva = expdata - export_rva;
|
|
|
nexp = pe_as32 (expdata + 24);
|
nexp = pe_as32 (expdata + 24);
|
name_rvas = pe_as32 (expdata + 32);
|
name_rvas = pe_as32 (expdata + 32);
|
ordinals = pe_as32 (expdata + 36);
|
ordinals = pe_as32 (expdata + 36);
|
ordbase = pe_as32 (expdata + 16);
|
ordbase = pe_as32 (expdata + 16);
|
exp_funcbase = pe_as32 (expdata + 28);
|
exp_funcbase = pe_as32 (expdata + 28);
|
|
|
/* Use internal dll name instead of full pathname. */
|
/* Use internal dll name instead of full pathname. */
|
dll_name = pe_as32 (expdata + 12) + erva;
|
dll_name = pe_as32 (expdata + 12) + erva;
|
|
|
bfd_map_over_sections (dll, get_section_vmas, section_data);
|
bfd_map_over_sections (dll, get_section_vmas, section_data);
|
|
|
/* Adjust the vma_offsets in case this PE got relocated. This
|
/* Adjust the vma_offsets in case this PE got relocated. This
|
assumes that *all* sections share the same relocation offset
|
assumes that *all* sections share the same relocation offset
|
as the text section. */
|
as the text section. */
|
for (i = 0; i < PE_SECTION_TABLE_SIZE; i++)
|
for (i = 0; i < PE_SECTION_TABLE_SIZE; i++)
|
{
|
{
|
section_data[i].vma_offset
|
section_data[i].vma_offset
|
+= ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
|
+= ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
|
}
|
}
|
|
|
/* Truncate name at first dot. Should maybe also convert to all
|
/* Truncate name at first dot. Should maybe also convert to all
|
lower case for convenience on Windows. */
|
lower case for convenience on Windows. */
|
read_pe_truncate_name (dll_name);
|
read_pe_truncate_name (dll_name);
|
|
|
/* Iterate through the list of symbols. */
|
/* Iterate through the list of symbols. */
|
for (i = 0; i < nexp; i++)
|
for (i = 0; i < nexp; i++)
|
{
|
{
|
/* Pointer to the names vector. */
|
/* Pointer to the names vector. */
|
unsigned long name_rva = pe_as32 (erva + name_rvas + i * 4);
|
unsigned long name_rva = pe_as32 (erva + name_rvas + i * 4);
|
|
|
/* Pointer to the function address vector. */
|
/* Pointer to the function address vector. */
|
unsigned long func_rva = pe_as32 (erva + exp_funcbase + i * 4);
|
unsigned long func_rva = pe_as32 (erva + exp_funcbase + i * 4);
|
|
|
/* Find this symbol's section in our own array. */
|
/* Find this symbol's section in our own array. */
|
int sectix = 0;
|
int sectix = 0;
|
|
|
for (sectix = 0; sectix < PE_SECTION_TABLE_SIZE; ++sectix)
|
for (sectix = 0; sectix < PE_SECTION_TABLE_SIZE; ++sectix)
|
{
|
{
|
if ((func_rva >= section_data[sectix].rva_start)
|
if ((func_rva >= section_data[sectix].rva_start)
|
&& (func_rva < section_data[sectix].rva_end))
|
&& (func_rva < section_data[sectix].rva_end))
|
{
|
{
|
add_pe_exported_sym (erva + name_rva,
|
add_pe_exported_sym (erva + name_rva,
|
func_rva,
|
func_rva,
|
section_data + sectix, dll_name, objfile);
|
section_data + sectix, dll_name, objfile);
|
break;
|
break;
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
/* discard expdata. */
|
/* discard expdata. */
|
do_cleanups (back_to);
|
do_cleanups (back_to);
|
}
|
}
|
|
|
