/* 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, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. Geoff Voelker (voelker@cs.washington.edu) 8-12-94 */ #ifndef UNIXSAVE #include #endif /* #include */ /* _fmode */ /* in case the include of config.h defined it */ #undef va_start #include #include #include #include #include /* strrchr */ #ifdef _GNU_H_WINDOWS_H #include "cyglacks.h" #endif /* Include relevant definitions from IMAGEHLP.H, which can be found in \\win32sdk\mstools\samples\image\include\imagehlp.h. */ PIMAGE_NT_HEADERS (__stdcall * pfnCheckSumMappedFile) (LPVOID BaseAddress, DWORD FileLength, LPDWORD HeaderSum, LPDWORD CheckSum); #include #include #include "ntheap.h" /* Info for keeping track of our heap. */ unsigned char *data_region_base = UNINIT_PTR; unsigned char *data_region_end = UNINIT_PTR; unsigned char *real_data_region_end = UNINIT_PTR; unsigned long data_region_size = UNINIT_LONG; unsigned long reserved_heap_size = UNINIT_LONG; extern BOOL ctrl_c_handler (unsigned long type); extern char my_begdata[]; extern char my_edata[]; extern char my_begbss[]; extern char my_endbss[]; extern char *my_begbss_static; extern char *my_endbss_static; #include "ntheap.h" enum { HEAP_UNINITIALIZED = 1, HEAP_UNLOADED, HEAP_LOADED }; /* Basically, our "initialized" flag. */ int heap_state = HEAP_UNINITIALIZED; /* So we can find our heap in the file to recreate it. */ unsigned long heap_index_in_executable = UNINIT_LONG; static void get_section_info (file_data *p_file); static void copy_executable_and_dump_data_section (file_data *, file_data *); static 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 = UNINIT_PTR; DWORD data_start_file = UNINIT_LONG; DWORD data_size = UNINIT_LONG; /* Cached info about the .bss section in the executable. */ PUCHAR bss_start = UNINIT_PTR; DWORD bss_size = UNINIT_LONG; void recreate_heap1() { char executable_path[MAX_PATH]; if (heap_state == HEAP_UNLOADED) { if (GetModuleFileName (NULL, executable_path, MAX_PATH) == 0) { printf ("Failed to find path for executable.\n"); exit (1); } recreate_heap (executable_path); } heap_state = HEAP_LOADED; } #ifdef HAVE_NTGUI HINSTANCE hinst = NULL; HINSTANCE hprevinst = NULL; LPSTR lpCmdLine = ""; int nCmdShow = 0; #endif /* HAVE_NTGUI */ #ifndef UNIXSAVE /* 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); #if 0 /* Give us a way to debug problems with crashes on startup when running under the MSVC profiler. */ if (GetEnvironmentVariable ("EMACS_DEBUG", NULL, 0) > 0) DebugBreak (); #endif /* 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 (heap_state == HEAP_UNLOADED) { char executable_path[MAX_PATH]; if (GetModuleFileName (NULL, executable_path, MAX_PATH) == 0) { printf ("Failed to find path for executable.\n"); exit (1); } #if 1 /* To allow profiling, make sure executable_path names the .exe file, not the ._xe file created by the profiler which contains extra code that makes the stored exe offsets incorrect. (This will not be necessary when unexec properly extends the .bss (or .data as appropriate) section to include the dumped bss data, and dumps the heap into a proper section of its own.) */ { char * p = strrchr (executable_path, '.'); if (p && p[1] == '_') p[1] = 'e'; } /* Using HiProf profiler, exe name is different still. */ { char * p = strrchr (executable_path, '\\'); strcpy (p, "\\emacs.exe"); } #endif recreate_heap (executable_path); heap_state = HEAP_LOADED; } else { /* Grab our malloc arena space now, before CRT starts up. */ sbrk (0); } /* 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. */ #ifdef HAVE_NTGUI /* determine WinMain args like crt0.c does */ hinst = GetModuleHandle(NULL); lpCmdLine = GetCommandLine(); nCmdShow = SW_SHOWDEFAULT; #endif mainCRTStartup (); } #endif /* UNIXSAVE */ /* Dump out .data and .bss sections into a new executable. */ 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; fflush (stdin); /* copy_stdin = *stdin; */ setvbuf(stdin,0,_IONBF,0); setvbuf(stdout,0,_IONBF,0); /* stdin->_data->__sdidinit = 0; */ if (!get_allocation_unit()) cache_system_info (); /* 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") && strcmp (ptr, ".EXE") ) strcat (in_filename, ".exe"); strcpy (out_filename, new_name); ptr = out_filename + strlen (out_filename) - 4; if (strcmp (ptr, ".exe") && 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. */ if (!open_input_file (&in_file, in_filename)) { printf ("Failed to open %s (%d)...bailing.\n", in_filename, GetLastError ()); exit (1); } /* 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 = (unsigned long) round_to_next ((unsigned char *) in_file.size, get_allocation_unit ()); /* from lisp we know what to use */ #ifdef IN_UNIXSAVE data_region_end = round_to_next(core_end,0x10000); real_data_region_end = data_region_end; #endif size = heap_index_in_executable + get_committed_heap_size () + bss_size; if (!open_output_file (&out_file, out_filename, size)) { printf ("Failed to open %s (%d)...bailing.\n", out_filename, GetLastError ()); exit (1); } /* Set the flag (before dumping). */ heap_state = HEAP_UNLOADED; copy_executable_and_dump_data_section (&in_file, &out_file); dump_bss_and_heap (&in_file, &out_file); /* Patch up header fields; profiler is picky about this. */ { PIMAGE_DOS_HEADER dos_header; PIMAGE_NT_HEADERS nt_header; HANDLE hImagehelp = LoadLibrary ("imagehlp.dll"); DWORD headersum; DWORD checksum; dos_header = (PIMAGE_DOS_HEADER) out_file.file_base; nt_header = (PIMAGE_NT_HEADERS) ((char *) dos_header + dos_header->e_lfanew); nt_header->OptionalHeader.CheckSum = 0; // nt_header->FileHeader.TimeDateStamp = time (NULL); // dos_header->e_cp = size / 512; // nt_header->OptionalHeader.SizeOfImage = size; pfnCheckSumMappedFile = (void *) GetProcAddress (hImagehelp, "CheckSumMappedFile"); if (pfnCheckSumMappedFile) { // nt_header->FileHeader.TimeDateStamp = time (NULL); pfnCheckSumMappedFile (out_file.file_base, out_file.size, &headersum, &checksum); nt_header->OptionalHeader.CheckSum = checksum; } FreeLibrary (hImagehelp); } close_file_data (&in_file); close_file_data (&out_file); } /* File handling. */ int open_input_file (file_data *p_file, char *filename) { HANDLE file; int changed =0; HANDLE file_mapping; void *file_base; DWORD size, upper_size; /* fix for cygnus pathnames */ if (filename[0]=='/' && filename[1]=='/' ) { filename[1]=filename[2]; filename[2]=':'; filename ++; changed = 1; } file = CreateFile (filename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0); if (changed) { filename --; filename[2]=filename[1]; filename[0]=filename[1]='/'; } if (file == INVALID_HANDLE_VALUE) return FALSE; size = GetFileSize (file, &upper_size); file_mapping = CreateFileMapping (file, NULL, PAGE_READONLY, 0, size, NULL); if (!file_mapping) return FALSE; file_base = MapViewOfFile (file_mapping, FILE_MAP_READ, 0, 0, size); if (file_base == 0) return FALSE; p_file->name = filename; p_file->size = size; p_file->file = file; p_file->file_mapping = file_mapping; p_file->file_base = file_base; return TRUE; } int 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) return FALSE; file_mapping = CreateFileMapping (file, NULL, PAGE_READWRITE, 0, size, NULL); if (!file_mapping) return FALSE; file_base = MapViewOfFile (file_mapping, FILE_MAP_WRITE, 0, 0, size); if (file_base == 0) return FALSE; p_file->name = filename; p_file->size = size; p_file->file = file; p_file->file_mapping = file_mapping; p_file->file_base = file_base; return TRUE; } /* Close the system structures associated with the given file. */ 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. */ #ifdef SEPARATE_BSS_SECTION static void get_bss_info_from_map_file (file_data *p_infile, PUCHAR *p_bss_start, DWORD *p_bss_size) { int n, start, len; char map_filename[MAX_PATH]; char buffer[256]; FILE *map; /* Overwrite the .exe extension on the executable file name with the .map extension. */ strcpy (map_filename, p_infile->name); n = strlen (map_filename) - 3; strcpy (&map_filename[n], "map"); map = fopen (map_filename, "r"); if (!map) { printf ("Failed to open map file %s, error %d...bailing out.\n", map_filename, GetLastError ()); exit (-1); } while (fgets (buffer, sizeof (buffer), map)) { if (!(strstr (buffer, ".bss") && strstr (buffer, "DATA"))) continue; n = sscanf (buffer, " %*d:%x %x", &start, &len); if (n != 2) { printf ("Failed to scan the .bss section line:\n%s", buffer); exit (-1); } break; } *p_bss_start = (PUCHAR) start; *p_bss_size = (DWORD) len; } #endif unsigned long get_section_size (PIMAGE_SECTION_HEADER p_section) { /* The true section size, before rounding. Some linkers swap the meaning of these two values. */ return min (p_section->SizeOfRawData, p_section->Misc.VirtualSize); } /* Return pointer to section header for named section. */ IMAGE_SECTION_HEADER * find_section (char * name, IMAGE_NT_HEADERS * nt_header) { PIMAGE_SECTION_HEADER section; int i; section = IMAGE_FIRST_SECTION (nt_header); for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++) { if (strcmp (section->Name, name) == 0) return section; section++; } return NULL; } /* Return pointer to section header for section containing the given relative virtual address. */ IMAGE_SECTION_HEADER * rva_to_section (DWORD rva, IMAGE_NT_HEADERS * nt_header) { PIMAGE_SECTION_HEADER section; int i; section = IMAGE_FIRST_SECTION (nt_header); for (i = 0; i < nt_header->FileHeader.NumberOfSections; i++) { if (rva >= section->VirtualAddress && rva < section->VirtualAddress + section->SizeOfRawData) return section; section++; } return NULL; } /* 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, data_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++) { #ifdef SEPARATE_BSS_SECTION 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); } #endif #if 0 if (!strcmp (section->Name, ".data")) { /* From lastfile.c */ extern char my_edata[]; /* The .data section. */ data_section = section; ptr = (char *) nt_header->OptionalHeader.ImageBase + section->VirtualAddress; data_start_va = ptr; data_start_file = section->PointerToRawData; /* 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 = my_edata - data_start_va; } #else #ifdef emacs #define DATA_SECTION "EMDATA" #else #define DATA_SECTION ".data" #endif if (!strcmp (section->Name, DATA_SECTION)) { /* The Emacs initialized data section. */ data_section = section; ptr = (char *) nt_header->OptionalHeader.ImageBase + section->VirtualAddress; data_start_va = ptr; data_start_file = section->PointerToRawData; /* Write back the full section. */ data_size = get_section_size (section); } #endif section++; } #ifdef SEPARATE_BSS_SECTION if (bss_start == UNINIT_PTR && bss_size == UNINIT_LONG) { /* Starting with MSVC 4.0, the .bss section has been eliminated and appended virtually to the end of the .data section. Our only hint about where the .bss section starts in the address comes from the SizeOfRawData field in the .data section header. Unfortunately, this field is only approximate, as it is a rounded number and is typically rounded just beyond the start of the .bss section. To find the start and size of the .bss section exactly, we have to peek into the map file. */ get_bss_info_from_map_file (p_infile, &ptr, &bss_size); bss_start = ptr + nt_header->OptionalHeader.ImageBase + data_section->VirtualAddress; } #else /* As noted in lastfile.c, the Alpha (but not the Intel) MSVC linker globally segregates all static and public bss data (ie. across all linked modules, not just per module), so we must take both static and public bss areas into account to determine the true extent of the bss area used by Emacs. To be strictly correct, we should dump the static and public bss areas used by Emacs separately if non-overlapping (since otherwise we are dumping bss data belonging to system libraries, eg. the static bss system data on the Alpha). However, in practice this doesn't seem to matter, since presumably the system libraries always reinitialize their bss variables. */ bss_start = min (my_begbss, my_begbss_static); bss_size = max ((char *)my_endbss, (char *) my_endbss_static) - (char *) bss_start; #endif } /* 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; DWORD 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. */ if (!ReadFile (file, bss_start, bss_size, &n_read, (void *)NULL)) { i = GetLastError (); exit (1); } 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; DWORD size, upper_size, n_read; 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) { return; } /* If we don't succeed with the mapping, then copy from the data into the heap. */ CloseHandle (file_mapping); if (VirtualAlloc (get_heap_start (), get_committed_heap_size (), MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE) == NULL) { i = GetLastError (); exit (1); } /* Seek to the location of the heap data in the executable. */ i = heap_index_in_executable; if (SetFilePointer (file, i, NULL, FILE_BEGIN) == 0xFFFFFFFF) { i = GetLastError (); exit (1); } /* Read in the data. */ if (!ReadFile (file, get_heap_start (), get_committed_heap_size (), &n_read, (void *)NULL)) { i = GetLastError (); exit (1); } CloseHandle (file); } /* ntheap.c */ /* Heap management routines 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, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. Geoff Voelker (voelker@cs.washington.edu) 7-29-94 */ /* */ /* #include "lisp.h" */ /* for VALMASK */ #define VALMASK -1 /* try for 500 MB of address space */ #define VALBITS 29 /* This gives us the page size and the size of the allocation unit on NT. */ SYSTEM_INFO sysinfo_cache; unsigned long syspage_mask = 0; /* These are defined to get Emacs to compile, but are not used. */ int edata; int etext; /* The major and minor versions of NT. */ int nt_major_version; int nt_minor_version; /* Distinguish between Windows NT and Windows 95. */ int os_subtype; /* Cache information describing the NT system for later use. */ void cache_system_info (void) { union { struct info { char major; char minor; short platform; } info; DWORD data; } version; /* Cache the version of the operating system. */ version.data = GetVersion (); nt_major_version = version.info.major; nt_minor_version = version.info.minor; if (version.info.platform & 0x8000) os_subtype = OS_WIN95; else os_subtype = OS_NT; /* Cache page size, allocation unit, processor type, etc. */ GetSystemInfo (&sysinfo_cache); syspage_mask = sysinfo_cache.dwPageSize - 1; } /* Round ADDRESS up to be aligned with ALIGN. */ unsigned char * round_to_next (unsigned char *address, unsigned long align) { unsigned long tmp; tmp = (unsigned long) address; tmp = (tmp + align - 1) / align; return (unsigned char *) (tmp * align); } /* The start of the data segment. */ unsigned char * get_data_start (void) { return data_region_base; } /* The end of the data segment. */ unsigned char * get_data_end (void) { return data_region_end; } static char * allocate_heap (void) { /* The base address for our GNU malloc heap is chosen in conjuction with the link settings for temacs.exe which control the stack size, the initial default process heap size and the executable image base address. The link settings and the malloc heap base below must all correspond; the relationship between these values depends on how NT and Win95 arrange the virtual address space for a process (and on the size of the code and data segments in temacs.exe). The most important thing is to make base address for the executable image high enough to leave enough room between it and the 4MB floor of the process address space on Win95 for the primary thread stack, the process default heap, and other assorted odds and ends (eg. environment strings, private system dll memory etc) that are allocated before temacs has a chance to grab its malloc arena. The malloc heap base can then be set several MB higher than the executable image base, leaving enough room for the code and data segments. Because some parts of Emacs can use rather a lot of stack space (for instance, the regular expression routines can potentially allocate several MB of stack space) we allow 8MB for the stack. Allowing 1MB for the default process heap, and 1MB for odds and ends, we can base the executable at 16MB and still have a generous safety margin. At the moment, the executable has about 810KB of code (for x86) and about 550KB of data - on RISC platforms the code size could be roughly double, so if we allow 4MB for the executable we will have plenty of room for expansion. Thus we would like to set the malloc heap base to 20MB. However, Win95 refuses to allocate the heap starting at this address, so we set the base to 27MB to make it happy. Since Emacs now leaves 28 bits available for pointers, this lets us use the remainder of the region below the 256MB line for our malloc arena - 229MB is still a pretty decent arena to play in! */ unsigned long base = DBEGIN; /* 27MB */ /* unsigned long base = 0x01B00000; */ /* 27MB */ unsigned long end = 1 << VALBITS; /* 256MB */ void *ptr = NULL; #define NTHEAP_PROBE_BASE 1 #if NTHEAP_PROBE_BASE /* This is never normally defined */ /* Try various addresses looking for one the kernel will let us have. */ while (!ptr && (base < end)) { reserved_heap_size = end - base; ptr = VirtualAlloc ((void *) base, get_reserved_heap_size (), MEM_RESERVE, PAGE_NOACCESS); base += 0x00100000; /* 1MB increment */ } #else reserved_heap_size = end - base; ptr = VirtualAlloc ((void *) base, get_reserved_heap_size (), MEM_RESERVE, PAGE_NOACCESS); #endif return ptr; } /* Emulate Unix sbrk. */ void * sbrk (unsigned long increment) { void *result; long size = (long) increment; /* Allocate our heap if we haven't done so already. */ if (data_region_base == UNINIT_PTR) { data_region_base = allocate_heap (); if (!data_region_base) return NULL; /* Ensure that the addresses don't use the upper tag bits since the Lisp type goes there. */ if (((unsigned long) data_region_base & ~VALMASK) != 0) { printf ("Error: The heap was allocated in upper memory.\n"); exit (1); } data_region_end = data_region_base; real_data_region_end = data_region_end; data_region_size = get_reserved_heap_size (); } result = data_region_end; /* If size is negative, shrink the heap by decommitting pages. */ if (size < 0) { int new_size; unsigned char *new_data_region_end; size = -size; /* Sanity checks. */ if ((data_region_end - size) < data_region_base) return NULL; /* We can only decommit full pages, so allow for partial deallocation [cga]. */ new_data_region_end = (data_region_end - size); new_data_region_end = (unsigned char *) ((long) (new_data_region_end + syspage_mask) & ~syspage_mask); new_size = real_data_region_end - new_data_region_end; real_data_region_end = new_data_region_end; if (new_size > 0) { /* Decommit size bytes from the end of the heap. */ if (!VirtualFree (real_data_region_end, new_size, MEM_DECOMMIT)) return NULL; } data_region_end -= size; } /* If size is positive, grow the heap by committing reserved pages. */ else if (size > 0) { /* Sanity checks. */ if ((data_region_end + size) > (data_region_base + get_reserved_heap_size ())) return NULL; /* Commit more of our heap. */ if (VirtualAlloc (data_region_end, size, MEM_COMMIT, PAGE_READWRITE) == NULL) return NULL; data_region_end += size; /* We really only commit full pages, so record where the real end of committed memory is [cga]. */ real_data_region_end = (unsigned char *) ((long) (data_region_end + syspage_mask) & ~syspage_mask); } return result; } /* Recreate the heap from the data that was dumped to the executable. EXECUTABLE_PATH tells us where to find the executable. */ void recreate_heap (char *executable_path) { unsigned char *tmp; /* First reserve the upper part of our heap. (We reserve first because there have been problems in the past where doing the mapping first has loaded DLLs into the VA space of our heap.) */ tmp = VirtualAlloc ((void *) get_heap_end (), get_reserved_heap_size () - get_committed_heap_size (), MEM_RESERVE, PAGE_NOACCESS); if (!tmp) exit (1); /* We read in the data for the .bss section from the executable first and map in the heap from the executable second to prevent any funny interactions between file I/O and file mapping. */ read_in_bss (executable_path); map_in_heap (executable_path); /* Update system version information to match current system. */ cache_system_info (); } /* Round the heap up to the given alignment. */ void round_heap (unsigned long align) { unsigned long needs_to_be; unsigned long need_to_alloc; needs_to_be = (unsigned long) round_to_next (get_heap_end (), align); need_to_alloc = needs_to_be - (unsigned long) get_heap_end (); if (need_to_alloc) sbrk (need_to_alloc); } #if (_MSC_VER >= 1000) /* MSVC 4.2 invokes these functions from mainCRTStartup to initialize a heap via HeapCreate. They are normally defined by the runtime, but we override them here so that the unnecessary HeapCreate call is not performed. */ int __cdecl _heap_init (void) { /* Stepping through the assembly indicates that mainCRTStartup is expecting a nonzero success return value. */ return 1; } void __cdecl _heap_term (void) #endif #ifdef UNIXSAVE BOOL ctrl_c_handler (unsigned long type) { sigint(); return 0; } #include "save.c" #endif