--- /dev/null
+/* 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 <config.h>
+#include "lisp.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+
+#define DONT_ENCAPSULATE /* filenames are external in unex*.c */
+#include "sysfile.h"
+
+#define PERROR(arg) perror(arg);exit(-1)
+
+#if !defined(HAVE_A_OUT_H) && !defined(WIN32_NATIVE)
+unexec (char *, char *, void *, void *, void *)
+{
+ PERROR("cannot unexec() a.out.h not installed");
+}
+#else
+
+#ifndef MAX_PATH
+#define MAX_PATH 260
+#endif
+
+#ifdef MINGW
+#include <../../include/a.out.h>
+#else
+#include <a.out.h>
+#endif
+
+#define STACK_SIZE 0x800000
+#define ALLOC_UNIT 0xFFFF
+#define ALLOC_MASK ~((unsigned long)(ALLOC_UNIT))
+#define ALIGN_ALLOC(addr) \
+((((unsigned long)addr) + ALLOC_UNIT) & ALLOC_MASK)
+/* Note that all sections must be aligned on a 0x1000 boundary so
+ this is the minimum size that our dummy bss can be. */
+#ifndef NO_DEBUG
+#define BSS_PAD_SIZE 0x1000
+#else
+#define BSS_PAD_SIZE 0
+#endif
+
+/* 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. */
+int
+unexec (char *out_name, char *in_name, uintptr_t start_data,
+ uintptr_t d1, uintptr_t 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,
+ 0755)) < 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);
+ return 0;
+}
+
+/* Flip through the executable and cache the info necessary for dumping. */
+static void get_section_info (int a_out, char* a_name)
+{
+ extern char 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
+ *normalized 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;
+ }
+
+ if ((new_bss_size - bss_size) < BSS_PAD_SIZE)
+ {
+ PERROR (".bss free space too small");
+ }
+
+ file_sz_change=(new_bss_size + data_padding) - BSS_PAD_SIZE;
+ 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;
+#ifdef NO_DEBUG
+ f_hdr.f_nscns--;
+#endif
+
+ 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 )
+ {
+ printf("warning: new data size is < approx\n");
+ }
+ f_ohdr.dsize=new_data_size;
+ f_ohdr.bsize=BSS_PAD_SIZE;
+ /* Prevent stack overflow with regexp usage. */
+ f_ohdr.SizeOfStackReserve = STACK_SIZE;
+
+ 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");
+ }
+#ifndef NO_DEBUG
+ /* Write small bss section. */
+ if (!sections_reversed)
+ {
+ f_bss.s_size = BSS_PAD_SIZE;
+ f_bss.s_paddr = BSS_PAD_SIZE;
+ f_bss.s_vaddr = f_data.s_vaddr - BSS_PAD_SIZE;
+ if (write(a_new, &f_bss, sizeof(f_bss)) != sizeof(f_bss))
+ {
+ PERROR("failed to write bss header");
+ }
+ }
+#endif
+ /* 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");
+ }
+#ifndef NO_DEBUG
+ /* Write small bss section. */
+ if (sections_reversed)
+ {
+ f_bss.s_size = BSS_PAD_SIZE;
+ f_bss.s_paddr = BSS_PAD_SIZE;
+ f_bss.s_vaddr = f_nextdata.s_vaddr - BSS_PAD_SIZE;
+ if (write(a_new, &f_bss, sizeof(f_bss)) != sizeof(f_bss))
+ {
+ PERROR("failed to write bss header");
+ }
+ }
+#endif
+ 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, §ion, 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, §ion, sizeof(section)) != sizeof(section))
+ {
+ PERROR("failed to write data header");
+ }
+ }
+#ifdef NO_DEBUG
+ /* 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");
+ }
+#endif
+ 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, sans small bss pad */
+ 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) - BSS_PAD_SIZE;
+ if (bss_padding < 0)
+ {
+ PERROR("padded .bss too small");
+ }
+ 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 pad 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) - BSS_PAD_SIZE;
+ if (bss_padding < 0)
+ {
+ PERROR("padded .bss too small");
+ }
+ 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 */
projects / chise / xemacs-chise.git / blobdiff