summaryrefslogtreecommitdiff
path: root/editors/emacs/files/unexmacosx.c
diff options
context:
space:
mode:
Diffstat (limited to 'editors/emacs/files/unexmacosx.c')
-rw-r--r--editors/emacs/files/unexmacosx.c1054
1 files changed, 0 insertions, 1054 deletions
diff --git a/editors/emacs/files/unexmacosx.c b/editors/emacs/files/unexmacosx.c
deleted file mode 100644
index b41c586d2e0..00000000000
--- a/editors/emacs/files/unexmacosx.c
+++ /dev/null
@@ -1,1054 +0,0 @@
-/* Dump Emacs in Mach-O format for use on Mac OS X.
- Copyright (C) 2001, 2002 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. */
-
-/* Contributed by Andrew Choi (akochoi@mac.com). */
-
-/* Documentation note.
-
- Consult the following documents/files for a description of the
- Mach-O format: the file loader.h, man pages for Mach-O and ld, old
- NEXTSTEP documents of the Mach-O format. The tool otool dumps the
- mach header (-h option) and the load commands (-l option) in a
- Mach-O file. The tool nm on Mac OS X displays the symbol table in
- a Mach-O file. For examples of unexec for the Mach-O format, see
- the file unexnext.c in the GNU Emacs distribution, the file
- unexdyld.c in the Darwin port of GNU Emacs 20.7, and unexdyld.c in
- the Darwin port of XEmacs 21.1. Also the Darwin Libc source
- contains the source code for malloc_freezedry and malloc_jumpstart.
- Read that to see what they do. This file was written completely
- from scratch, making use of information from the above sources. */
-
-/* The Mac OS X implementation of unexec makes use of Darwin's `zone'
- memory allocator. All calls to malloc, realloc, and free in Emacs
- are redirected to unexec_malloc, unexec_realloc, and unexec_free in
- this file. When temacs is run, all memory requests are handled in
- the zone EmacsZone. The Darwin memory allocator library calls
- maintain the data structures to manage this zone. Dumping writes
- its contents to data segments of the executable file. When emacs
- is run, the loader recreates the contents of the zone in memory.
- However since the initialization routine of the zone memory
- allocator is run again, this `zone' can no longer be used as a
- heap. That is why emacs uses the ordinary malloc system call to
- allocate memory. Also, when a block of memory needs to be
- reallocated and the new size is larger than the old one, a new
- block must be obtained by malloc and the old contents copied to
- it. */
-
-/* Peculiarity of the Mach-O files generated by ld in Mac OS X
- (possible causes of future bugs if changed).
-
- The file offset of the start of the __TEXT segment is zero. Since
- the Mach header and load commands are located at the beginning of a
- Mach-O file, copying the contents of the __TEXT segment from the
- input file overwrites them in the output file. Despite this,
- unexec works fine as written below because the segment load command
- for __TEXT appears, and is therefore processed, before all other
- load commands except the segment load command for __PAGEZERO, which
- remains unchanged.
-
- Although the file offset of the start of the __TEXT segment is
- zero, none of the sections it contains actually start there. In
- fact, the earliest one starts a few hundred bytes beyond the end of
- the last load command. The linker option -headerpad controls the
- minimum size of this padding. Its setting can be changed in
- s/darwin.h. A value of 0x300, e.g., leaves room for about 15
- additional load commands for the newly created __DATA segments (at
- 56 bytes each). Unexec fails if there is not enough room for these
- new segments.
-
- The __TEXT segment contains the sections __text, __cstring,
- __picsymbol_stub, and __const and the __DATA segment contains the
- sections __data, __la_symbol_ptr, __nl_symbol_ptr, __dyld, __bss,
- and __common. The other segments do not contain any sections.
- These sections are copied from the input file to the output file,
- except for __data, __bss, and __common, which are dumped from
- memory. The types of the sections __bss and __common are changed
- from S_ZEROFILL to S_REGULAR. Note that the number of sections and
- their relative order in the input and output files remain
- unchanged. Otherwise all n_sect fields in the nlist records in the
- symbol table (specified by the LC_SYMTAB load command) will have to
- be changed accordingly.
-*/
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <fcntl.h>
-#include <stdarg.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <mach/mach.h>
-#include <mach-o/loader.h>
-#include <mach-o/reloc.h>
-#if defined (__ppc__)
-#include <mach-o/ppc/reloc.h>
-#endif
-#include <objc/malloc.h>
-
-#define VERBOSE 1
-
-/* Size of buffer used to copy data from the input file to the output
- file in function unexec_copy. */
-#define UNEXEC_COPY_BUFSZ 1024
-
-/* Regions with memory addresses above this value are assumed to be
- mapped to dynamically loaded libraries and will not be dumped. */
-#define VM_DATA_TOP (20 * 1024 * 1024)
-
-/* Used by malloc_freezedry and malloc_jumpstart. */
-int malloc_cookie;
-
-/* Type of an element on the list of regions to be dumped. */
-struct region_t {
- vm_address_t address;
- vm_size_t size;
- vm_prot_t protection;
- vm_prot_t max_protection;
-
- struct region_t *next;
-};
-
-/* Head and tail of the list of regions to be dumped. */
-struct region_t *region_list_head = 0;
-struct region_t *region_list_tail = 0;
-
-/* Pointer to array of load commands. */
-struct load_command **lca;
-
-/* Number of load commands. */
-int nlc;
-
-/* The highest VM address of segments loaded by the input file.
- Regions with addresses beyond this are assumed to be allocated
- dynamically and thus require dumping. */
-vm_address_t infile_lc_highest_addr = 0;
-
-/* The lowest file offset used by the all sections in the __TEXT
- segments. This leaves room at the beginning of the file to store
- the Mach-O header. Check this value against header size to ensure
- the added load commands for the new __DATA segments did not
- overwrite any of the sections in the __TEXT segment. */
-unsigned long text_seg_lowest_offset = 0x10000000;
-
-/* Mach header. */
-struct mach_header mh;
-
-/* Offset at which the next load command should be written. */
-unsigned long curr_header_offset = sizeof (struct mach_header);
-
-/* Current adjustment that needs to be made to offset values because
- of additional data segments. */
-unsigned long delta = 0;
-
-int infd, outfd;
-
-int in_dumped_exec = 0;
-
-malloc_zone_t *emacs_zone;
-
-/* file offset of input file's data segment */
-off_t data_segment_old_fileoff;
-
-struct segment_command *data_segment_scp;
-
-/* Read n bytes from infd into memory starting at address dest.
- Return true if successful, false otherwise. */
-static int
-unexec_read (void *dest, size_t n)
-{
- return n == read (infd, dest, n);
-}
-
-/* Write n bytes from memory starting at address src to outfd starting
- at offset dest. Return true if successful, false otherwise. */
-static int
-unexec_write (off_t dest, const void *src, size_t count)
-{
- if (lseek (outfd, dest, SEEK_SET) != dest)
- return 0;
-
- return write (outfd, src, count) == count;
-}
-
-/* Copy n bytes from starting offset src in infd to starting offset
- dest in outfd. Return true if successful, false otherwise. */
-static int
-unexec_copy (off_t dest, off_t src, ssize_t count)
-{
- ssize_t bytes_read;
- ssize_t bytes_to_read;
-
- char buf[UNEXEC_COPY_BUFSZ];
-
- if (lseek (infd, src, SEEK_SET) != src)
- return 0;
-
- if (lseek (outfd, dest, SEEK_SET) != dest)
- return 0;
-
- while (count > 0)
- {
- bytes_to_read = count > UNEXEC_COPY_BUFSZ ? UNEXEC_COPY_BUFSZ : count;
- bytes_read = read (infd, buf, bytes_to_read);
- if (bytes_read <= 0)
- return 0;
- if (write (outfd, buf, bytes_read) != bytes_read)
- return 0;
- count -= bytes_read;
- }
-
- return 1;
-}
-
-/* Debugging and informational messages routines. */
-
-static void
-unexec_error (char *format, ...)
-{
- va_list ap;
-
- va_start (ap, format);
- fprintf (stderr, "unexec: ");
- vfprintf (stderr, format, ap);
- fprintf (stderr, "\n");
- va_end (ap);
- exit (1);
-}
-
-static void
-print_prot (vm_prot_t prot)
-{
- if (prot == VM_PROT_NONE)
- printf ("none");
- else
- {
- putchar (prot & VM_PROT_READ ? 'r' : ' ');
- putchar (prot & VM_PROT_WRITE ? 'w' : ' ');
- putchar (prot & VM_PROT_EXECUTE ? 'x' : ' ');
- putchar (' ');
- }
-}
-
-static void
-print_region (vm_address_t address, vm_size_t size, vm_prot_t prot,
- vm_prot_t max_prot)
-{
- printf ("%#10x %#8x ", address, size);
- print_prot (prot);
- putchar (' ');
- print_prot (max_prot);
- putchar ('\n');
-}
-
-static void
-print_region_list ()
-{
- struct region_t *r;
-
- printf (" address size prot maxp\n");
-
- for (r = region_list_head; r; r = r->next)
- print_region (r->address, r->size, r->protection, r->max_protection);
-}
-
-void
-print_regions ()
-{
- task_t target_task = mach_task_self ();
- vm_address_t address = (vm_address_t) 0;
- vm_size_t size;
- struct vm_region_basic_info info;
- mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT;
- mach_port_t object_name;
-
- printf (" address size prot maxp\n");
-
- while (vm_region (target_task, &address, &size, VM_REGION_BASIC_INFO,
- (vm_region_info_t) &info, &info_count, &object_name)
- == KERN_SUCCESS && info_count == VM_REGION_BASIC_INFO_COUNT)
- {
- print_region (address, size, info.protection, info.max_protection);
-
- if (object_name != MACH_PORT_NULL)
- mach_port_deallocate (target_task, object_name);
-
- address += size;
- }
-}
-
-/* Build the list of regions that need to be dumped. Regions with
- addresses above VM_DATA_TOP are omitted. Adjacent regions with
- identical protection are merged. Note that non-writable regions
- cannot be omitted because they some regions created at run time are
- read-only. */
-static void
-build_region_list ()
-{
- task_t target_task = mach_task_self ();
- vm_address_t address = (vm_address_t) 0;
- vm_size_t size;
- struct vm_region_basic_info info;
- mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT;
- mach_port_t object_name;
- struct region_t *r;
-
-#if VERBOSE
- printf ("--- List of All Regions ---\n");
- printf (" address size prot maxp\n");
-#endif
-
- while (vm_region (target_task, &address, &size, VM_REGION_BASIC_INFO,
- (vm_region_info_t) &info, &info_count, &object_name)
- == KERN_SUCCESS && info_count == VM_REGION_BASIC_INFO_COUNT)
- {
- /* Done when we reach addresses of shared libraries, which are
- loaded in high memory. */
- if (address >= VM_DATA_TOP)
- break;
-
-#if VERBOSE
- print_region (address, size, info.protection, info.max_protection);
-#endif
-
- /* If a region immediately follows the previous one (the one
- most recently added to the list) and has identical
- protection, merge it with the latter. Otherwise create a
- new list element for it. */
- if (region_list_tail
- && info.protection == region_list_tail->protection
- && info.max_protection == region_list_tail->max_protection
- && region_list_tail->address + region_list_tail->size == address)
- {
- region_list_tail->size += size;
- }
- else
- {
- r = (struct region_t *) malloc (sizeof (struct region_t));
-
- if (!r)
- unexec_error ("cannot allocate region structure");
-
- r->address = address;
- r->size = size;
- r->protection = info.protection;
- r->max_protection = info.max_protection;
-
- r->next = 0;
- if (region_list_head == 0)
- {
- region_list_head = r;
- region_list_tail = r;
- }
- else
- {
- region_list_tail->next = r;
- region_list_tail = r;
- }
-
- /* Deallocate (unused) object name returned by
- vm_region. */
- if (object_name != MACH_PORT_NULL)
- mach_port_deallocate (target_task, object_name);
- }
-
- address += size;
- }
-
- printf ("--- List of Regions to be Dumped ---\n");
- print_region_list ();
-}
-
-
-#define MAX_UNEXEC_REGIONS 200
-
-int num_unexec_regions;
-vm_range_t unexec_regions[MAX_UNEXEC_REGIONS];
-
-static void
-unexec_regions_recorder (task_t task, void *rr, unsigned type,
- vm_range_t *ranges, unsigned num)
-{
- while (num && num_unexec_regions < MAX_UNEXEC_REGIONS)
- {
- unexec_regions[num_unexec_regions++] = *ranges;
- printf ("%#8x (sz: %#8x)\n", ranges->address, ranges->size);
- ranges++; num--;
- }
- if (num_unexec_regions == MAX_UNEXEC_REGIONS)
- fprintf (stderr, "malloc_freezedry_recorder: too many regions\n");
-}
-
-static kern_return_t
-unexec_reader (task_t task, vm_address_t address, vm_size_t size, void **ptr)
-{
- *ptr = (void *) address;
- return KERN_SUCCESS;
-}
-
-void
-find_emacs_zone_regions ()
-{
- num_unexec_regions = 0;
-
- emacs_zone->introspect->enumerator (mach_task_self(), 0,
- MALLOC_PTR_REGION_RANGE_TYPE
- | MALLOC_ADMIN_REGION_RANGE_TYPE,
- (vm_address_t) emacs_zone,
- unexec_reader,
- unexec_regions_recorder);
-}
-
-static int
-unexec_regions_sort_compare (const void *a, const void *b)
-{
- vm_address_t aa = ((vm_range_t *) a)->address;
- vm_address_t bb = ((vm_range_t *) b)->address;
-
- if (aa < bb)
- return -1;
- else if (aa > bb)
- return 1;
- else
- return 0;
-}
-
-static void
-unexec_regions_merge ()
-{
- int i, n;
- vm_range_t r;
-
- qsort (unexec_regions, num_unexec_regions, sizeof (unexec_regions[0]),
- &unexec_regions_sort_compare);
- n = 0;
- r = unexec_regions[0];
- for (i = 1; i < num_unexec_regions; i++)
- {
- if (r.address + r.size == unexec_regions[i].address)
- {
- r.size += unexec_regions[i].size;
- }
- else
- {
- unexec_regions[n++] = r;
- r = unexec_regions[i];
- }
- }
- unexec_regions[n++] = r;
- num_unexec_regions = n;
-}
-
-
-/* More informational messages routines. */
-
-static void
-print_load_command_name (int lc)
-{
- switch (lc)
- {
- case LC_SEGMENT:
- printf ("LC_SEGMENT ");
- break;
- case LC_LOAD_DYLINKER:
- printf ("LC_LOAD_DYLINKER ");
- break;
- case LC_LOAD_DYLIB:
- printf ("LC_LOAD_DYLIB ");
- break;
- case LC_SYMTAB:
- printf ("LC_SYMTAB ");
- break;
- case LC_DYSYMTAB:
- printf ("LC_DYSYMTAB ");
- break;
- case LC_UNIXTHREAD:
- printf ("LC_UNIXTHREAD ");
- break;
- case LC_PREBOUND_DYLIB:
- printf ("LC_PREBOUND_DYLIB");
- break;
- case LC_TWOLEVEL_HINTS:
- printf ("LC_TWOLEVEL_HINTS");
- break;
- default:
- printf ("unknown ");
- }
-}
-
-static void
-print_load_command (struct load_command *lc)
-{
- print_load_command_name (lc->cmd);
- printf ("%8d", lc->cmdsize);
-
- if (lc->cmd == LC_SEGMENT)
- {
- struct segment_command *scp;
- struct section *sectp;
- int j;
-
- scp = (struct segment_command *) lc;
- printf (" %-16.16s %#10x %#8x\n",
- scp->segname, scp->vmaddr, scp->vmsize);
-
- sectp = (struct section *) (scp + 1);
- for (j = 0; j < scp->nsects; j++)
- {
- printf (" %-16.16s %#10x %#8x\n",
- sectp->sectname, sectp->addr, sectp->size);
- sectp++;
- }
- }
- else
- printf ("\n");
-}
-
-/* Read header and load commands from input file. Store the latter in
- the global array lca. Store the total number of load commands in
- global variable nlc. */
-static void
-read_load_commands ()
-{
- int n, i, j;
-
- if (!unexec_read (&mh, sizeof (struct mach_header)))
- unexec_error ("cannot read mach-o header");
-
- if (mh.magic != MH_MAGIC)
- unexec_error ("input file not in Mach-O format");
-
- if (mh.filetype != MH_EXECUTE)
- unexec_error ("input Mach-O file is not an executable object file");
-
-#if VERBOSE
- printf ("--- Header Information ---\n");
- printf ("Magic = 0x%08x\n", mh.magic);
- printf ("CPUType = %d\n", mh.cputype);
- printf ("CPUSubType = %d\n", mh.cpusubtype);
- printf ("FileType = 0x%x\n", mh.filetype);
- printf ("NCmds = %d\n", mh.ncmds);
- printf ("SizeOfCmds = %d\n", mh.sizeofcmds);
- printf ("Flags = 0x%08x\n", mh.flags);
-#endif
-
- nlc = mh.ncmds;
- lca = (struct load_command **) malloc (nlc * sizeof (struct load_command *));
-
- for (i = 0; i < nlc; i++)
- {
- struct load_command lc;
- /* Load commands are variable-size: so read the command type and
- size first and then read the rest. */
- if (!unexec_read (&lc, sizeof (struct load_command)))
- unexec_error ("cannot read load command");
- lca[i] = (struct load_command *) malloc (lc.cmdsize);
- memcpy (lca[i], &lc, sizeof (struct load_command));
- if (!unexec_read (lca[i] + 1, lc.cmdsize - sizeof (struct load_command)))
- unexec_error ("cannot read content of load command");
- if (lc.cmd == LC_SEGMENT)
- {
- struct segment_command *scp = (struct segment_command *) lca[i];
-
- if (scp->vmaddr + scp->vmsize > infile_lc_highest_addr)
- infile_lc_highest_addr = scp->vmaddr + scp->vmsize;
-
- if (strncmp (scp->segname, SEG_TEXT, 16) == 0)
- {
- struct section *sectp = (struct section *) (scp + 1);
- int j;
-
- for (j = 0; j < scp->nsects; j++)
- if (sectp->offset < text_seg_lowest_offset)
- text_seg_lowest_offset = sectp->offset;
- }
- }
- }
-
- printf ("Highest address of load commands in input file: %#8x\n",
- infile_lc_highest_addr);
-
- printf ("Lowest offset of all sections in __TEXT segment: %#8x\n",
- text_seg_lowest_offset);
-
- printf ("--- List of Load Commands in Input File ---\n");
- printf ("# cmd cmdsize name address size\n");
-
- for (i = 0; i < nlc; i++)
- {
- printf ("%1d ", i);
- print_load_command (lca[i]);
- }
-}
-
-/* Copy a LC_SEGMENT load command other than the __DATA segment from
- the input file to the output file, adjusting the file offset of the
- segment and the file offsets of sections contained in it. */
-static void
-copy_segment (struct load_command *lc)
-{
- struct segment_command *scp = (struct segment_command *) lc;
- unsigned long old_fileoff = scp->fileoff;
- struct section *sectp;
- int j;
-
- scp->fileoff += delta;
-
- sectp = (struct section *) (scp + 1);
- for (j = 0; j < scp->nsects; j++)
- {
- sectp->offset += delta;
- sectp++;
- }
-
- printf ("Writing segment %-16.16s at %#8x - %#8x (sz: %#8x)\n",
- scp->segname, scp->fileoff, scp->fileoff + scp->filesize,
- scp->filesize);
-
- if (!unexec_copy (scp->fileoff, old_fileoff, scp->filesize))
- unexec_error ("cannot copy segment from input to output file");
- if (!unexec_write (curr_header_offset, lc, lc->cmdsize))
- unexec_error ("cannot write load command to header");
-
- curr_header_offset += lc->cmdsize;
-}
-
-/* Copy a LC_SEGMENT load command for the __DATA segment in the input
- file to the output file. We assume that only one such segment load
- command exists in the input file and it contains the sections
- __data, __bss, __common, __la_symbol_ptr, __nl_symbol_ptr, and
- __dyld. The first three of these should be dumped from memory and
- the rest should be copied from the input file. Note that the
- sections __bss and __common contain no data in the input file
- because their flag fields have the value S_ZEROFILL. Dumping these
- from memory makes it necessary to adjust file offset fields in
- subsequently dumped load commands. Then, create new __DATA segment
- load commands for regions on the region list other than the one
- corresponding to the __DATA segment in the input file. */
-static void
-copy_data_segment (struct load_command *lc)
-{
- struct segment_command *scp = (struct segment_command *) lc;
- struct section *sectp;
- int j;
- unsigned long header_offset, file_offset, old_file_offset;
- struct region_t *r;
-
- printf ("Writing segment %-16.16s at %#8x - %#8x (sz: %#8x)\n",
- scp->segname, scp->fileoff, scp->fileoff + scp->filesize,
- scp->filesize);
-
- if (delta != 0)
- unexec_error ("cannot handle multiple DATA segments in input file");
-
- /* Offsets in the output file for writing the next section structure
- and segment data block, respectively. */
- header_offset = curr_header_offset + sizeof (struct segment_command);
-
- sectp = (struct section *) (scp + 1);
- for (j = 0; j < scp->nsects; j++)
- {
- old_file_offset = sectp->offset;
- sectp->offset = sectp->addr - scp->vmaddr + scp->fileoff;
- /* The __data section is dumped from memory. The __bss and
- __common sections are also dumped from memory but their flag
- fields require changing (from S_ZEROFILL to S_REGULAR). The
- other three kinds of sections are just copied from the input
- file. */
- if (strncmp (sectp->sectname, SECT_DATA, 16) == 0)
- {
- if (!unexec_write (sectp->offset, (void *) sectp->addr, sectp->size))
- unexec_error ("cannot write section %s", SECT_DATA);
- if (!unexec_write (header_offset, sectp, sizeof (struct section)))
- unexec_error ("cannot write section %s's header", SECT_DATA);
- }
- else if (strncmp (sectp->sectname, SECT_BSS, 16) == 0
- || strncmp (sectp->sectname, SECT_COMMON, 16) == 0)
- {
- sectp->flags = S_REGULAR;
- if (!unexec_write (sectp->offset, (void *) sectp->addr, sectp->size))
- unexec_error ("cannot write section %s", SECT_DATA);
- if (!unexec_write (header_offset, sectp, sizeof (struct section)))
- unexec_error ("cannot write section %s's header", SECT_DATA);
- }
- else if (strncmp (sectp->sectname, "__la_symbol_ptr", 16) == 0
- || strncmp (sectp->sectname, "__nl_symbol_ptr", 16) == 0
- || strncmp (sectp->sectname, "__dyld", 16) == 0
- || strncmp (sectp->sectname, "__const", 16) == 0
- || strncmp (sectp->sectname, "__cfstring", 16) == 0)
- {
- if (!unexec_copy (sectp->offset, old_file_offset, sectp->size))
- unexec_error ("cannot copy section %s", sectp->sectname);
- if (!unexec_write (header_offset, sectp, sizeof (struct section)))
- unexec_error ("cannot write section %s's header", sectp->sectname);
- }
- else
- unexec_error ("unrecognized section name in __DATA segment");
-
- printf (" section %-16.16s at %#8x - %#8x (sz: %#8x)\n",
- sectp->sectname, sectp->offset, sectp->offset + sectp->size,
- sectp->size);
-
- header_offset += sizeof (struct section);
- sectp++;
- }
-
- /* The new filesize of the segment is set to its vmsize because data
- blocks for segments must start at region boundaries. Note that
- this may leave unused locations at the end of the segment data
- block because the total of the sizes of all sections in the
- segment is generally smaller than vmsize. */
- delta = scp->vmsize - scp->filesize;
- scp->filesize = scp->vmsize;
- if (!unexec_write (curr_header_offset, scp, sizeof (struct segment_command)))
- unexec_error ("cannot write header of __DATA segment");
- curr_header_offset += lc->cmdsize;
-
- /* Create new __DATA segment load commands for regions on the region
- list that do not corresponding to any segment load commands in
- the input file.
- */
- file_offset = scp->fileoff + scp->filesize;
- for (j = 0; j < num_unexec_regions; j++)
- {
- struct segment_command sc;
-
- sc.cmd = LC_SEGMENT;
- sc.cmdsize = sizeof (struct segment_command);
- strncpy (sc.segname, SEG_DATA, 16);
- sc.vmaddr = unexec_regions[j].address;
- sc.vmsize = unexec_regions[j].size;
- sc.fileoff = file_offset;
- sc.filesize = unexec_regions[j].size;
- sc.maxprot = VM_PROT_READ | VM_PROT_WRITE;
- sc.initprot = VM_PROT_READ | VM_PROT_WRITE;
- sc.nsects = 0;
- sc.flags = 0;
-
- printf ("Writing segment %-16.16s at %#8x - %#8x (sz: %#8x)\n",
- sc.segname, sc.fileoff, sc.fileoff + sc.filesize,
- sc.filesize);
-
- if (!unexec_write (sc.fileoff, (void *) sc.vmaddr, sc.vmsize))
- unexec_error ("cannot write new __DATA segment");
- delta += sc.filesize;
- file_offset += sc.filesize;
-
- if (!unexec_write (curr_header_offset, &sc, sc.cmdsize))
- unexec_error ("cannot write new __DATA segment's header");
- curr_header_offset += sc.cmdsize;
- mh.ncmds++;
- }
-}
-
-/* Copy a LC_SYMTAB load command from the input file to the output
- file, adjusting the file offset fields. */
-static void
-copy_symtab (struct load_command *lc)
-{
- struct symtab_command *stp = (struct symtab_command *) lc;
-
- stp->symoff += delta;
- stp->stroff += delta;
-
- printf ("Writing LC_SYMTAB command\n");
-
- if (!unexec_write (curr_header_offset, lc, lc->cmdsize))
- unexec_error ("cannot write symtab command to header");
-
- curr_header_offset += lc->cmdsize;
-}
-
-/* Fix up relocation entries. */
-static void
-unrelocate (const char *name, off_t reloff, int nrel)
-{
- int i, unreloc_count;
- struct relocation_info reloc_info;
- struct scattered_relocation_info *sc_reloc_info
- = (struct scattered_relocation_info *) &reloc_info;
-
- for (unreloc_count = 0, i = 0; i < nrel; i++)
- {
- if (lseek (infd, reloff, L_SET) != reloff)
- unexec_error ("unrelocate: %s:%d cannot seek to reloc_info", name, i);
- if (!unexec_read (&reloc_info, sizeof (reloc_info)))
- unexec_error ("unrelocate: %s:%d cannot read reloc_info", name, i);
- reloff += sizeof (reloc_info);
-
- if (sc_reloc_info->r_scattered == 0)
- switch (reloc_info.r_type)
- {
- case GENERIC_RELOC_VANILLA:
- if (reloc_info.r_address >= data_segment_scp->vmaddr
- && reloc_info.r_address < (data_segment_scp->vmaddr
- + data_segment_scp->vmsize))
- {
- off_t src_off = data_segment_old_fileoff
- + reloc_info.r_address - data_segment_scp->vmaddr;
- off_t dst_off = data_segment_scp->fileoff
- + reloc_info.r_address - data_segment_scp->vmaddr;
-
- if (!unexec_copy (dst_off, src_off, 1 << reloc_info.r_length))
- unexec_error ("unrelocate: %s:%d cannot copy original value",
- name, i);
- unreloc_count++;
- }
- break;
- default:
- unexec_error ("unrelocate: %s:%d cannot handle type = %d",
- name, i, reloc_info.r_type);
- }
- else
- switch (sc_reloc_info->r_type)
- {
-#if defined (__ppc__)
- case PPC_RELOC_PB_LA_PTR:
- /* nothing to do for prebound lazy pointer */
- break;
-#endif
- default:
- unexec_error ("unrelocate: %s:%d cannot handle scattered type = %d",
- name, i, sc_reloc_info->r_type);
- }
- }
-
- if (nrel > 0)
- printf ("Fixed up %d/%d %s relocation entries in data segment.\n",
- unreloc_count, nrel, name);
-}
-
-/* Copy a LC_DYSYMTAB load command from the input file to the output
- file, adjusting the file offset fields. */
-static void
-copy_dysymtab (struct load_command *lc)
-{
- struct dysymtab_command *dstp = (struct dysymtab_command *) lc;
-
- unrelocate ("local", dstp->locreloff, dstp->nlocrel);
- unrelocate ("external", dstp->extreloff, dstp->nextrel);
-
- if (dstp->nextrel > 0) {
- dstp->extreloff += delta;
- }
-
- if (dstp->nlocrel > 0) {
- dstp->locreloff += delta;
- }
-
- if (dstp->nindirectsyms > 0)
- dstp->indirectsymoff += delta;
-
- printf ("Writing LC_DYSYMTAB command\n");
-
- if (!unexec_write (curr_header_offset, lc, lc->cmdsize))
- unexec_error ("cannot write symtab command to header");
-
- curr_header_offset += lc->cmdsize;
-}
-
-/* Copy a LC_TWOLEVEL_HINTS load command from the input file to the output
- file, adjusting the file offset fields. */
-static void
-copy_twolevelhints (struct load_command *lc)
-{
- struct twolevel_hints_command *tlhp = (struct twolevel_hints_command *) lc;
-
- if (tlhp->nhints > 0) {
- tlhp->offset += delta;
- }
-
- printf ("Writing LC_TWOLEVEL_HINTS command\n");
-
- if (!unexec_write (curr_header_offset, lc, lc->cmdsize))
- unexec_error ("cannot write two level hint command to header");
-
- curr_header_offset += lc->cmdsize;
-}
-
-/* Copy other kinds of load commands from the input file to the output
- file, ones that do not require adjustments of file offsets. */
-static void
-copy_other (struct load_command *lc)
-{
- printf ("Writing ");
- print_load_command_name (lc->cmd);
- printf (" command\n");
-
- if (!unexec_write (curr_header_offset, lc, lc->cmdsize))
- unexec_error ("cannot write symtab command to header");
-
- curr_header_offset += lc->cmdsize;
-}
-
-/* Loop through all load commands and dump them. Then write the Mach
- header. */
-static void
-dump_it ()
-{
- int i;
-
- printf ("--- Load Commands written to Output File ---\n");
-
- for (i = 0; i < nlc; i++)
- switch (lca[i]->cmd)
- {
- case LC_SEGMENT:
- {
- struct segment_command *scp = (struct segment_command *) lca[i];
- if (strncmp (scp->segname, SEG_DATA, 16) == 0)
- {
- /* save data segment file offset and segment_command for
- unrelocate */
- data_segment_old_fileoff = scp->fileoff;
- data_segment_scp = scp;
-
- copy_data_segment (lca[i]);
- }
- else
- {
- copy_segment (lca[i]);
- }
- }
- break;
- case LC_SYMTAB:
- copy_symtab (lca[i]);
- break;
- case LC_DYSYMTAB:
- copy_dysymtab (lca[i]);
- break;
- case LC_TWOLEVEL_HINTS:
- copy_twolevelhints (lca[i]);
- break;
- default:
- copy_other (lca[i]);
- break;
- }
-
- if (curr_header_offset > text_seg_lowest_offset)
- unexec_error ("not enough room for load commands for new __DATA segments");
-
- printf ("%d unused bytes follow Mach-O header\n",
- text_seg_lowest_offset - curr_header_offset);
-
- mh.sizeofcmds = curr_header_offset - sizeof (struct mach_header);
- if (!unexec_write (0, &mh, sizeof (struct mach_header)))
- unexec_error ("cannot write final header contents");
-}
-
-/* Take a snapshot of Emacs and make a Mach-O format executable file
- from it. The file names of the output and input files are outfile
- and infile, respectively. The three other parameters are
- ignored. */
-void
-unexec (char *outfile, char *infile, void *start_data, void *start_bss,
- void *entry_address)
-{
- infd = open (infile, O_RDONLY, 0);
- if (infd < 0)
- {
- unexec_error ("cannot open input file `%s'", infile);
- }
-
- outfd = open (outfile, O_WRONLY | O_TRUNC | O_CREAT, 0755);
- if (outfd < 0)
- {
- close (infd);
- unexec_error ("cannot open output file `%s'", outfile);
- }
-
- build_region_list ();
- read_load_commands ();
-
- find_emacs_zone_regions ();
- unexec_regions_merge ();
-
- in_dumped_exec = 1;
-
- dump_it ();
-
- close (outfd);
-}
-
-
-void
-unexec_init_emacs_zone ()
-{
- emacs_zone = malloc_create_zone (0, 0);
- malloc_set_zone_name (emacs_zone, "EmacsZone");
-}
-
-int
-ptr_in_unexec_regions (void *ptr)
-{
- int i;
-
- for (i = 0; i < num_unexec_regions; i++)
- if ((vm_address_t) ptr - unexec_regions[i].address
- < unexec_regions[i].size)
- return 1;
-
- return 0;
-}
-
-void *
-unexec_malloc (size_t size)
-{
- if (in_dumped_exec)
- return malloc (size);
- else
- return malloc_zone_malloc (emacs_zone, size);
-}
-
-void *
-unexec_realloc (void *old_ptr, size_t new_size)
-{
- if (in_dumped_exec)
- if (ptr_in_unexec_regions (old_ptr))
- {
- char *p = malloc (new_size);
- /* 2002-04-15 T. Ikegami <ikegami@adam.uprr.pr>. The original
- code to get size failed to reallocate read_buffer
- (lread.c). */
- int old_size = malloc_default_zone()->size (emacs_zone, old_ptr);
- int size = new_size > old_size ? old_size : new_size;
-
- if (size)
- memcpy (p, old_ptr, size);
- return p;
- }
- else
- return realloc (old_ptr, new_size);
- else
- return malloc_zone_realloc (emacs_zone, old_ptr, new_size);
-}
-
-void
-unexec_free (void *ptr)
-{
- if (in_dumped_exec)
- {
- if (!ptr_in_unexec_regions (ptr))
- free (ptr);
- }
- else
- malloc_zone_free (emacs_zone, ptr);
-}
-
-/* arch-tag: 1a784f7b-a184-4c4f-9544-da8619593d72
- (do not change this comment) */