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This commit is contained in:
Karl Heuer 1995-06-15 20:45:57 +00:00
parent 7c938215cd
commit 2147fb50c4
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/*
unexec for GNU Emacs on Windows NT.
Copyright (C) 1994 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs 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.
GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
Geoff Voelker (voelker@cs.washington.edu) 8-12-94
*/
#include <stdlib.h> /* _fmode */
#include <stdio.h>
#include <fcntl.h>
#include <windows.h>
extern BOOL ctrl_c_handler (unsigned long type);
#include "ntheap.h"
/* A convenient type for keeping all the info about a mapped file together. */
typedef struct file_data {
char *name;
unsigned long size;
HANDLE file;
HANDLE file_mapping;
unsigned char *file_base;
} file_data;
/* Basically, our "initialized" flag. */
BOOL need_to_recreate_heap = FALSE;
/* So we can find our heap in the file to recreate it. */
unsigned long heap_index_in_executable = 0;
void open_input_file (file_data *p_file, char *name);
void open_output_file (file_data *p_file, char *name, unsigned long size);
void close_file_data (file_data *p_file);
void get_section_info (file_data *p_file);
void copy_executable_and_dump_data_section (file_data *, file_data *);
void dump_bss_and_heap (file_data *p_infile, file_data *p_outfile);
/* Cached info about the .data section in the executable. */
PUCHAR data_start_va = 0;
DWORD data_start_file = 0;
DWORD data_size = 0;
/* Cached info about the .bss section in the executable. */
PUCHAR bss_start = 0;
DWORD bss_size = 0;
/* Startup code for running on NT. When we are running as the dumped
version, we need to bootstrap our heap and .bss section into our
address space before we can actually hand off control to the startup
code supplied by NT (primarily because that code relies upon malloc ()). */
void
_start (void)
{
extern void mainCRTStartup (void);
/* Cache system info, e.g., the NT page size. */
cache_system_info ();
/* If we're a dumped version of emacs then we need to recreate
our heap and play tricks with our .bss section. Do this before
start up. (WARNING: Do not put any code before this section
that relies upon malloc () and runs in the dumped version. It
won't work.) */
if (need_to_recreate_heap)
{
char executable_path[MAX_PATH];
if (GetModuleFileName (NULL, executable_path, MAX_PATH) == 0)
{
printf ("Failed to find path for executable.\n");
exit (1);
}
recreate_heap (executable_path);
need_to_recreate_heap = FALSE;
}
/* The default behavior is to treat files as binary and patch up
text files appropriately, in accordance with the MSDOS code. */
_fmode = O_BINARY;
/* This prevents ctrl-c's in shells running while we're suspended from
having us exit. */
SetConsoleCtrlHandler ((PHANDLER_ROUTINE) ctrl_c_handler, TRUE);
/* Invoke the NT CRT startup routine now that our housecleaning
is finished. */
mainCRTStartup ();
}
/* Dump out .data and .bss sections into a new exectubale. */
void
unexec (char *new_name, char *old_name, void *start_data, void *start_bss,
void *entry_address)
{
file_data in_file, out_file;
char out_filename[MAX_PATH], in_filename[MAX_PATH];
unsigned long size;
char *ptr;
/* Make sure that the input and output filenames have the
".exe" extension...patch them up if they don't. */
strcpy (in_filename, old_name);
ptr = in_filename + strlen (in_filename) - 4;
if (strcmp (ptr, ".exe"))
strcat (in_filename, ".exe");
strcpy (out_filename, new_name);
ptr = out_filename + strlen (out_filename) - 4;
if (strcmp (ptr, ".exe"))
strcat (out_filename, ".exe");
printf ("Dumping from %s\n", in_filename);
printf (" to %s\n", out_filename);
/* We need to round off our heap to NT's allocation unit (64KB). */
round_heap (get_allocation_unit ());
/* Open the undumped executable file. */
open_input_file (&in_file, in_filename);
/* Get the interesting section info, like start and size of .bss... */
get_section_info (&in_file);
/* The size of the dumped executable is the size of the original
executable plus the size of the heap and the size of the .bss section. */
heap_index_in_executable = round_to_next (in_file.size,
get_allocation_unit ());
size = heap_index_in_executable + get_committed_heap_size () + bss_size;
open_output_file (&out_file, out_filename, size);
/* Set the flag (before dumping). */
need_to_recreate_heap = TRUE;
copy_executable_and_dump_data_section (&in_file, &out_file);
dump_bss_and_heap (&in_file, &out_file);
close_file_data (&in_file);
close_file_data (&out_file);
}
/* File handling. */
void
open_input_file (file_data *p_file, char *filename)
{
HANDLE file;
HANDLE file_mapping;
void *file_base;
unsigned long size, upper_size;
file = CreateFile (filename, GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
if (file == INVALID_HANDLE_VALUE)
{
printf ("Failed to open %s (%d)...bailing.\n",
filename, GetLastError ());
exit (1);
}
size = GetFileSize (file, &upper_size);
file_mapping = CreateFileMapping (file, NULL, PAGE_READONLY,
0, size, NULL);
if (!file_mapping)
{
printf ("Failed to create file mapping of %s (%d)...bailing.\n",
filename, GetLastError ());
exit (1);
}
file_base = MapViewOfFile (file_mapping, FILE_MAP_READ, 0, 0, size);
if (file_base == 0)
{
printf ("Failed to map view of file of %s (%d)...bailing.\n",
filename, GetLastError ());
exit (1);
}
p_file->name = filename;
p_file->size = size;
p_file->file = file;
p_file->file_mapping = file_mapping;
p_file->file_base = file_base;
}
void
open_output_file (file_data *p_file, char *filename, unsigned long size)
{
HANDLE file;
HANDLE file_mapping;
void *file_base;
file = CreateFile (filename, GENERIC_READ | GENERIC_WRITE, 0, NULL,
CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
if (file == INVALID_HANDLE_VALUE)
{
printf ("open_output_file: Failed to open %s (%d).\n",
filename, GetLastError ());
exit (1);
}
file_mapping = CreateFileMapping (file, NULL, PAGE_READWRITE,
0, size, NULL);
if (!file_mapping)
{
printf ("open_output_file: Failed to create file mapping of %s (%d).\n",
filename, GetLastError ());
exit (1);
}
file_base = MapViewOfFile (file_mapping, FILE_MAP_WRITE, 0, 0, size);
if (file_base == 0)
{
printf ("open_output_file: Failed to map view of file of %s (%d).\n",
filename, GetLastError ());
exit (1);
}
p_file->name = filename;
p_file->size = size;
p_file->file = file;
p_file->file_mapping = file_mapping;
p_file->file_base = file_base;
}
/* Close the system structures associated with the given file. */
static void
close_file_data (file_data *p_file)
{
UnmapViewOfFile (p_file->file_base);
CloseHandle (p_file->file_mapping);
CloseHandle (p_file->file);
}
/* Routines to manipulate NT executable file sections. */
static unsigned long
get_section_size (PIMAGE_SECTION_HEADER p_section)
{
/* The section size is in different locations in the different versions. */
switch (get_nt_minor_version ())
{
case 10:
return p_section->SizeOfRawData;
default:
return p_section->Misc.VirtualSize;
}
}
/* Flip through the executable and cache the info necessary for dumping. */
static void
get_section_info (file_data *p_infile)
{
PIMAGE_DOS_HEADER dos_header;
PIMAGE_NT_HEADERS nt_header;
PIMAGE_SECTION_HEADER section;
unsigned char *ptr;
int i;
dos_header = (PIMAGE_DOS_HEADER) p_infile->file_base;
if (dos_header->e_magic != IMAGE_DOS_SIGNATURE)
{
printf ("Unknown EXE header in %s...bailing.\n", p_infile->name);
exit (1);
}
nt_header = (PIMAGE_NT_HEADERS) (((unsigned long) dos_header) +
dos_header->e_lfanew);
if (nt_header == NULL)
{
printf ("Failed to find IMAGE_NT_HEADER in %s...bailing.\n",
p_infile->name);
exit (1);
}
/* Check the NT header signature ... */
if (nt_header->Signature != IMAGE_NT_SIGNATURE)
{
printf ("Invalid IMAGE_NT_SIGNATURE 0x%x in %s...bailing.\n",
nt_header->Signature, p_infile->name);
}
/* Flip through the sections for .data and .bss ... */
section = (PIMAGE_SECTION_HEADER) IMAGE_FIRST_SECTION (nt_header);
for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++)
{
if (!strcmp (section->Name, ".bss"))
{
/* The .bss section. */
ptr = (char *) nt_header->OptionalHeader.ImageBase +
section->VirtualAddress;
bss_start = ptr;
bss_size = get_section_size (section);
}
if (!strcmp (section->Name, ".data"))
{
/* The .data section. */
ptr = (char *) nt_header->OptionalHeader.ImageBase +
section->VirtualAddress;
data_start_va = ptr;
data_start_file = section->PointerToRawData;
data_size = get_section_size (section);
}
section++;
}
}
/* The dump routines. */
static void
copy_executable_and_dump_data_section (file_data *p_infile,
file_data *p_outfile)
{
unsigned char *data_file, *data_va;
unsigned long size, index;
/* Get a pointer to where the raw data should go in the executable file. */
data_file = (char *) p_outfile->file_base + data_start_file;
/* Get a pointer to the raw data in our address space. */
data_va = data_start_va;
size = (DWORD) data_file - (DWORD) p_outfile->file_base;
printf ("Copying executable up to data section...\n");
printf ("\t0x%08x Offset in input file.\n", 0);
printf ("\t0x%08x Offset in output file.\n", 0);
printf ("\t0x%08x Size in bytes.\n", size);
memcpy (p_outfile->file_base, p_infile->file_base, size);
size = data_size;
printf ("Dumping .data section...\n");
printf ("\t0x%08x Address in process.\n", data_va);
printf ("\t0x%08x Offset in output file.\n",
data_file - p_outfile->file_base);
printf ("\t0x%08x Size in bytes.\n", size);
memcpy (data_file, data_va, size);
index = (DWORD) data_file + size - (DWORD) p_outfile->file_base;
size = p_infile->size - index;
printf ("Copying rest of executable...\n");
printf ("\t0x%08x Offset in input file.\n", index);
printf ("\t0x%08x Offset in output file.\n", index);
printf ("\t0x%08x Size in bytes.\n", size);
memcpy ((char *) p_outfile->file_base + index,
(char *) p_infile->file_base + index, size);
}
static void
dump_bss_and_heap (file_data *p_infile, file_data *p_outfile)
{
unsigned char *heap_data, *bss_data;
unsigned long size, index;
printf ("Dumping heap into executable...\n");
index = heap_index_in_executable;
size = get_committed_heap_size ();
heap_data = get_heap_start ();
printf ("\t0x%08x Heap start in process.\n", heap_data);
printf ("\t0x%08x Heap offset in executable.\n", index);
printf ("\t0x%08x Heap size in bytes.\n", size);
memcpy ((PUCHAR) p_outfile->file_base + index, heap_data, size);
printf ("Dumping .bss into executable...\n");
index += size;
size = bss_size;
bss_data = bss_start;
printf ("\t0x%08x BSS start in process.\n", bss_data);
printf ("\t0x%08x BSS offset in executable.\n", index);
printf ("\t0x%08x BSS size in bytes.\n", size);
memcpy ((char *) p_outfile->file_base + index, bss_data, size);
}
/* Reload and remap routines. */
/* Load the dumped .bss section into the .bss area of our address space. */
void
read_in_bss (char *filename)
{
HANDLE file;
unsigned long size, index, n_read, total_read;
char buffer[512], *bss;
int i;
file = CreateFile (filename, GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
if (file == INVALID_HANDLE_VALUE)
{
i = GetLastError ();
exit (1);
}
/* Seek to where the .bss section is tucked away after the heap... */
index = heap_index_in_executable + get_committed_heap_size ();
if (SetFilePointer (file, index, NULL, FILE_BEGIN) == 0xFFFFFFFF)
{
i = GetLastError ();
exit (1);
}
/* Ok, read in the saved .bss section and initialize all
uninitialized variables. */
total_read = 0;
size = bss_size;
bss = bss_start;
while (ReadFile (file, buffer, 512, &n_read, NULL))
{
if (n_read == 0)
break;
memcpy (bss, buffer, n_read);
bss += n_read;
total_read += n_read;
}
CloseHandle (file);
}
/* Map the heap dumped into the executable file into our address space. */
void
map_in_heap (char *filename)
{
HANDLE file;
HANDLE file_mapping;
void *file_base;
unsigned long size, upper_size;
int i;
file = CreateFile (filename, GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
if (file == INVALID_HANDLE_VALUE)
{
i = GetLastError ();
exit (1);
}
size = GetFileSize (file, &upper_size);
file_mapping = CreateFileMapping (file, NULL, PAGE_WRITECOPY,
0, size, NULL);
if (!file_mapping)
{
i = GetLastError ();
exit (1);
}
size = get_committed_heap_size ();
file_base = MapViewOfFileEx (file_mapping, FILE_MAP_COPY, 0,
heap_index_in_executable, size,
get_heap_start ());
if (file_base == 0)
{
i = GetLastError ();
exit (1);
}
}