xemacs-beta: src/unexcw.c comparison

comparison src/unexcw.c @ 428:3ecd8885ac67 r21-2-22

Import from CVS: tag r21-2-22

author	cvs
date	Mon, 13 Aug 2007 11:28:15 +0200
parents
children	a5df635868b2

comparison

equal deleted inserted replaced

-:0a0253eac470
+:3ecd8885ac67
+/* unexec for GNU Emacs on Cygwin32.
+Copyright (C) 1994, 1998 Free Software Foundation, Inc.
+This file is part of XEmacs.
+XEmacs 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.
+XEmacs 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 XEmacs; see the file COPYING.  If not, write to the Free
+Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA.
+*/
+/* This is a complete rewrite, some code snarfed from unexnt.c and
+unexec.c, Andy Piper (andy@xemacs.org) 13-1-98 */
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <config.h>
+#include <string.h>
+#include "sysfile.h"
+#define PERROR(arg) perror(arg);exit(-1)
+#ifndef HAVE_A_OUT_H
+unexec (char *, char *, void *, void *,	void *)
+{
+PERROR("cannot unexec() a.out.h not installed");
+}
+#else
+#undef CONST
+#include <windows.h>
+#include <a.out.h>
+#define ALLOC_UNIT 0xFFFF
+#define ALLOC_MASK ~((unsigned long)(ALLOC_UNIT))
+#define ALIGN_ALLOC(addr) \
+((((unsigned long)addr) + ALLOC_UNIT) & ALLOC_MASK)
+/* To prevent zero-initialized variables from being placed into the bss
+section, use non-zero values to represent an uninitialized state.  */
+#define UNINIT_PTR ((void *) 0xF0A0F0A0)
+#define UNINIT_LONG (0xF0A0F0A0L)
+static void get_section_info (int a_out, char* a_name);
+static void copy_executable_and_dump_data_section (int a_out, int a_new);
+static void dup_file_area(int a_out, int a_new, long size);
+#if 0
+static void write_int_to_bss(int a_out, int a_new, void* va, void* newval);
+#endif
+/* Cached info about the .data section in the executable.  */
+void* data_start_va = UNINIT_PTR;
+unsigned long  data_size = UNINIT_LONG;
+/* Cached info about the .bss section in the executable.  */
+void* bss_start = UNINIT_PTR;
+unsigned long  bss_size = UNINIT_LONG;
+int sections_reversed = 0;
+FILHDR f_hdr;
+PEAOUTHDR f_ohdr;
+SCNHDR f_data, f_bss, f_text, f_nextdata;
+#define PERROR(arg) perror(arg);exit(-1)
+#define CHECK_AOUT_POS(a) \
+if (lseek(a_out, 0, SEEK_CUR) != a) \
+{ \
+printf("we are at %lx, should be at %lx\n", \
+	 lseek(a_out, 0, SEEK_CUR), a); \
+exit(-1); \
+}
+/* Dump out .data and .bss sections into a new executable.  */
+void unexec (char *out_name, char *in_name, void *start_data,
+	     void * d1,	void * d2)
+{
+/* ugly nt hack - should be in lisp */
+int a_new, a_out = -1;
+char new_name[MAX_PATH], a_name[MAX_PATH];
+char *ptr;
+/* Make sure that the input and output filenames have the
+".exe" extension...patch them up if they don't.  */
+strcpy (a_name, in_name);
+ptr = a_name + strlen (a_name) - 4;
+if (strcmp (ptr, ".exe"))
+strcat (a_name, ".exe");
+strcpy (new_name, out_name);
+ptr = new_name + strlen (new_name) - 4;
+if (strcmp (ptr, ".exe"))
+strcat (new_name, ".exe");
+/* We need to round off our heap to NT's allocation unit (64KB).  */
+/* round_heap (get_allocation_unit ()); */
+if (a_name && (a_out = open (a_name, O_RDONLY | OPEN_BINARY)) < 0)
+{
+PERROR (a_name);
+}
+if ((a_new = open (new_name, O_WRONLY | O_TRUNC | O_CREAT | OPEN_BINARY,
+		     CREAT_MODE)) < 0)
+{
+PERROR (new_name);
+}
+/* Get the interesting section info, like start and size of .bss...  */
+get_section_info (a_out, a_name);
+copy_executable_and_dump_data_section (a_out, a_new);
+close(a_out);
+close(a_new);
+}
+/* Flip through the executable and cache the info necessary for dumping.  */
+static void get_section_info (int a_out, char* a_name)
+{
+extern int my_ebss;
+/* From lastfile.c  */
+extern char my_edata[];
+if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
+{
+PERROR (a_name);
+}
+if (f_hdr.e_magic != DOSMAGIC)
+{
+PERROR("unknown exe header");
+}
+/* Check the NT header signature ...  */
+if (f_hdr.nt_signature != NT_SIGNATURE)
+{
+PERROR("invalid nt header");
+}
+/* Flip through the sections for .data and .bss ...  */
+if (f_hdr.f_opthdr > 0)
+{
+if (read (a_out, &f_ohdr, AOUTSZ) != AOUTSZ)
+	{
+	  PERROR (a_name);
+	}
+}
+/* Loop through .data & .bss section headers, copying them in.
+With newer lds these are reversed so we have to cope with both */
+lseek (a_out, sizeof (f_hdr) + f_hdr.f_opthdr, 0);
+if (read (a_out, &f_text, sizeof (f_text)) != sizeof (f_text)
+||
+strcmp (f_text.s_name, ".text"))
+{
+PERROR ("no .text section");
+}
+/* The .bss section.  */
+if (read (a_out, &f_bss, sizeof (f_bss)) != sizeof (f_bss)
+||
+(strcmp (f_bss.s_name, ".bss") && strcmp (f_bss.s_name, ".data")))
+{
+PERROR ("no .bss / .data section");
+}
+/* check for reversed .bss and .data */
+if (!strcmp(f_bss.s_name, ".data"))
+{
+printf(".data and .bss reversed\n");
+sections_reversed = 1;
+memcpy(&f_data, &f_bss, sizeof(f_bss));
+}
+/* The .data section.  */
+if (!sections_reversed)
+{
+if (read (a_out, &f_data, sizeof (f_data)) != sizeof (f_data)
+	  ||
+	  strcmp (f_data.s_name, ".data"))
+	{
+	  PERROR ("no .data section");
+	}
+}
+else
+{
+if (read (a_out, &f_bss, sizeof (f_bss)) != sizeof (f_bss)
+	  ||
+	  strcmp (f_bss.s_name, ".bss"))
+	{
+	  PERROR ("no .bss section");
+	}
+}
+bss_start = (void *) ((char*)f_ohdr.ImageBase + f_bss.s_vaddr);
+bss_size = (unsigned long)((char*)&my_ebss-(char*)bss_start);
+/* must keep bss data that we want to be blank as blank */
+printf("found bss - keeping %lx of %lx bytes\n", bss_size, f_ohdr.bsize);
+/* The .data section.  */
+data_start_va = (void *) ((char*)f_ohdr.ImageBase + f_data.s_vaddr);
+/* We want to only write Emacs data back to the executable,
+not any of the library data (if library data is included,
+then a dumped Emacs won't run on system versions other
+than the one Emacs was dumped on).  */
+data_size = (unsigned long)my_edata - (unsigned long)data_start_va;
+printf("found data - keeping %lx of %lx bytes\n", data_size, f_ohdr.dsize);
+/* The following data section - often .idata */
+if (read (a_out, &f_nextdata, sizeof (f_nextdata)) != sizeof (f_nextdata)
+&&
+strcmp (&f_nextdata.s_name[2], "data"))
+{
+PERROR ("no other data section");
+}
+}
+/* The dump routines.  */
+static void
+copy_executable_and_dump_data_section (int a_out, int a_new)
+{
+long size=0;
+unsigned long new_data_size, new_bss_size,
+bss_padding, file_sz_change, data_padding=0,
+f_data_s_vaddr = f_data.s_vaddr,
+f_data_s_scnptr = f_data.s_scnptr,
+f_bss_s_vaddr = f_bss.s_vaddr,
+f_nextdata_s_scnptr = f_nextdata.s_scnptr;
+int i;
+void* empty_space;
+extern int static_heap_dumped;
+SCNHDR section;
+/* calculate new sizes f_ohdr.dsize is the total initialized data
+size on disk which is f_data.s_size + f_idata.s_size.
+f_ohdr.data_start is the base addres of all data and so should
+not be changed. *.s_vaddr is the virtual address of the start
+of the section normalzed from f_ohdr.ImageBase. *.s_paddr
+appears to be the number of bytes in the section actually used
+(whereas *.s_size is aligned).
+bsize is now 0 since subsumed into .data
+dsize is dsize + (f_data.s_vaddr - f_bss.s_vaddr)
+f_data.s_vaddr is f_bss.s_vaddr
+f_data.s_size is new dsize maybe.
+what about s_paddr & s_scnptr?  */
+/* this is the amount the file increases in size */
+if (!sections_reversed)
+{
+new_bss_size = f_data.s_vaddr - f_bss.s_vaddr;
+data_padding = 0;
+}
+else
+{
+new_bss_size = f_nextdata.s_vaddr - f_bss.s_vaddr;
+data_padding = (f_bss.s_vaddr - f_data.s_vaddr) - f_data.s_size;
+}
+file_sz_change=new_bss_size + data_padding;
+new_data_size=f_ohdr.dsize + file_sz_change;
+if (!sections_reversed)
+{
+f_data.s_vaddr = f_bss.s_vaddr;
+}
+f_data.s_paddr += file_sz_change;
+#if 0
+if (f_data.s_size + f_nextdata.s_size != f_ohdr.dsize)
+{
+printf("section size doesn't tally with dsize %lx != %lx\n",
+	     f_data.s_size + f_nextdata.s_size, f_ohdr.dsize);
+}
+#endif
+f_data.s_size += file_sz_change;
+lseek (a_new, 0, SEEK_SET);
+/* write file header */
+f_hdr.f_symptr += file_sz_change;
+f_hdr.f_nscns--;
+printf("writing file header\n");
+if (write(a_new, &f_hdr, sizeof(f_hdr)) != sizeof(f_hdr))
+{
+PERROR("failed to write file header");
+}
+/* write optional header fixing dsize & bsize*/
+printf("writing optional header\n");
+printf("new data size is %lx, >= %lx\n", new_data_size,
+	 f_ohdr.dsize + f_ohdr.bsize);
+if (new_data_size < f_ohdr.dsize + f_ohdr.bsize )
+{
+PERROR("new data size is < approx");
+}
+f_ohdr.dsize=new_data_size;
+f_ohdr.bsize=0;
+if (write(a_new, &f_ohdr, sizeof(f_ohdr)) != sizeof(f_ohdr))
+{
+PERROR("failed to write optional header");
+}
+/* write text as is */
+printf("writing text header (unchanged)\n");
+if (write(a_new, &f_text, sizeof(f_text)) != sizeof(f_text))
+{
+PERROR("failed to write text header");
+}
+/* write new data header */
+printf("writing .data header\n");
+if (write(a_new, &f_data, sizeof(f_data)) != sizeof(f_data))
+{
+PERROR("failed to write data header");
+}
+printf("writing following data header\n");
+f_nextdata.s_scnptr += file_sz_change;
+if (f_nextdata.s_lnnoptr != 0) f_nextdata.s_lnnoptr += file_sz_change;
+if (f_nextdata.s_relptr != 0) f_nextdata.s_relptr += file_sz_change;
+if (write(a_new, &f_nextdata, sizeof(f_nextdata)) != sizeof(f_nextdata))
+{
+PERROR("failed to write nextdata header");
+}
+/* copy other section headers adjusting the file offset */
+for (i=0; i<(f_hdr.f_nscns-3); i++)
+{
+if (read (a_out, &section, sizeof (section)) != sizeof (section))
+	{
+	  PERROR ("no .data section");
+	}
+section.s_scnptr += file_sz_change;
+if (section.s_lnnoptr != 0) section.s_lnnoptr += file_sz_change;
+if (section.s_relptr != 0) section.s_relptr += file_sz_change;
+if (write(a_new, &section, sizeof(section)) != sizeof(section))
+	{
+	  PERROR("failed to write data header");
+	}
+}
+/* dump bss to maintain offsets */
+memset(&f_bss, 0, sizeof(f_bss));
+if (write(a_new, &f_bss, sizeof(f_bss)) != sizeof(f_bss))
+{
+PERROR("failed to write bss header");
+}
+size=lseek(a_new, 0, SEEK_CUR);
+CHECK_AOUT_POS(size);
+/* copy eveything else until start of data */
+size = f_data_s_scnptr - lseek (a_out, 0, SEEK_CUR);
+printf ("copying executable up to data section ... %lx bytes\n",
+	  size);
+dup_file_area(a_out, a_new, size);
+CHECK_AOUT_POS(f_data_s_scnptr);
+if (!sections_reversed)
+{
+/* dump bss + padding between sections */
+printf ("dumping .bss into executable... %lx bytes\n", bss_size);
+if (write(a_new, bss_start, bss_size) != (int)bss_size)
+	{
+	  PERROR("failed to write bss section");
+	}
+/* pad, needs to be zero */
+bss_padding = new_bss_size - bss_size;
+printf ("padding .bss ... %lx bytes\n", bss_padding);
+empty_space = malloc(bss_padding);
+memset(empty_space, 0, bss_padding);
+if (write(a_new, empty_space, bss_padding) != (int)bss_padding)
+	{
+	  PERROR("failed to write bss section");
+	}
+free(empty_space);
+}
+/* tell dumped version not to free pure heap */
+static_heap_dumped = 1;
+/* Get a pointer to the raw data in our address space.  */
+printf ("dumping .data section... %lx bytes\n", data_size);
+if (write(a_new, data_start_va, data_size) != (int)data_size)
+{
+PERROR("failed to write data section");
+}
+/* were going to use free again ... */
+static_heap_dumped = 0;
+size = lseek(a_out, f_data_s_scnptr + data_size, SEEK_SET);
+if (!sections_reversed)
+{
+size = f_nextdata_s_scnptr - size;
+dup_file_area(a_out, a_new, size);
+}
+else
+{
+/* need to bad to bss with data in file */
+printf ("padding .data ... %lx bytes\n", data_padding);
+size = (f_bss_s_vaddr - f_data_s_vaddr) - data_size;
+dup_file_area(a_out, a_new, size);
+/* dump bss + padding between sections */
+printf ("dumping .bss into executable... %lx bytes\n", bss_size);
+if (write(a_new, bss_start, bss_size) != (int)bss_size)
+	{
+	  PERROR("failed to write bss section");
+	}
+/* pad, needs to be zero */
+bss_padding = new_bss_size - bss_size;
+printf ("padding .bss ... %lx bytes\n", bss_padding);
+empty_space = malloc(bss_padding);
+memset(empty_space, 0, bss_padding);
+if (write(a_new, empty_space, bss_padding) != (int)bss_padding)
+	{
+	  PERROR("failed to write bss section");
+	}
+free(empty_space);
+if (lseek(a_new, 0, SEEK_CUR) != f_nextdata.s_scnptr)
+	{
+	  printf("at %lx should be at %lx\n",
+		 lseek(a_new, 0, SEEK_CUR),
+		 f_nextdata.s_scnptr);
+	  PERROR("file positioning error\n");
+	}
+lseek(a_out, f_nextdata_s_scnptr, SEEK_SET);
+}
+CHECK_AOUT_POS(f_nextdata_s_scnptr);
+/* now dump - nextdata don't need to do this cygwin ds is in .data! */
+printf ("dumping following data section... %lx bytes\n", f_nextdata.s_size);
+dup_file_area(a_out,a_new,f_nextdata.s_size);
+/* write rest of file */
+printf ("writing rest of file\n");
+size = lseek(a_out, 0, SEEK_END);
+size = size - (f_nextdata_s_scnptr + f_nextdata.s_size); /* length remaining in a_out */
+lseek(a_out, f_nextdata_s_scnptr + f_nextdata.s_size, SEEK_SET);
+dup_file_area(a_out, a_new, size);
+}
+/*
+* copy from aout to anew
+*/
+static void dup_file_area(int a_out, int a_new, long size)
+{
+char page[BUFSIZ];
+long n;
+for (; size > 0; size -= sizeof (page))
+{
+n = size > sizeof (page) ? sizeof (page) : size;
+if (read (a_out, page, n) != n || write (a_new, page, n) != n)
+	{
+	  PERROR ("dump_out()");
+	}
+}
+}
+#if 0
+static void write_int_to_bss(int a_out, int a_new, void* va, void* newval)
+{
+int cpos;
+cpos = lseek(a_new, 0, SEEK_CUR);
+if (va < bss_start || va > bss_start + f_data.s_size)
+{
+PERROR("address not in data space\n");
+}
+lseek(a_new, f_data.s_scnptr + ((unsigned long)va -
+				  (unsigned long)bss_start), SEEK_SET);
+if (write(a_new, newval, sizeof(int)) != (int)sizeof(int))
+{
+PERROR("failed to write int value");
+}
+lseek(a_new, cpos, SEEK_SET);
+}
+#endif
+#endif /* HAVE_A_OUT_H */

Mercurial > hg > xemacs-beta

comparison src/unexcw.c @ 428:3ecd8885ac67 r21-2-22