--- /dev/null
+/*
+ * Copyright (c) 1995 by Sun Microsystems, Inc.
+ * All rights reserved.
+ *
+ * This source code is a product of Sun Microsystems, Inc. and is provided
+ * for unrestricted use provided that this legend is included on all tape
+ * media and as a part of the software program in whole or part. Users
+ * may copy or modify this source code without charge, but are not authorized
+ * to license or distribute it to anyone else except as part of a product or
+ * program developed by the user.
+ *
+ * THIS PROGRAM CONTAINS SOURCE CODE COPYRIGHTED BY SUN MICROSYSTEMS, INC.
+ * SUN MICROSYSTEMS, INC., MAKES NO REPRESENTATIONS ABOUT THE SUITABLITY
+ * OF SUCH SOURCE CODE FOR ANY PURPOSE. IT IS PROVIDED "AS IS" WITHOUT
+ * EXPRESS OR IMPLIED WARRANTY OF ANY KIND. SUN MICROSYSTEMS, INC. DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO SUCH SOURCE CODE, INCLUDING ALL IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN
+ * NO EVENT SHALL SUN MICROSYSTEMS, INC. BE LIABLE FOR ANY SPECIAL, INDIRECT,
+ * INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
+ * FROM USE OF SUCH SOURCE CODE, REGARDLESS OF THE THEORY OF LIABILITY.
+ *
+ * This source code is provided with no support and without any obligation on
+ * the part of Sun Microsystems, Inc. to assist in its use, correction,
+ * modification or enhancement.
+ *
+ * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
+ * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS
+ * SOURCE CODE OR ANY PART THEREOF.
+ *
+ * Sun Microsystems, Inc.
+ * 2550 Garcia Avenue
+ * Mountain View, California 94043
+ */
+
+/*
+ * dynodump(3x) dumps a running executable into a specified ELF file. The new
+ * file consists of the memory contents of the original file together with any
+ * heap. This heap is assigned to a new `.heap' section within the new file.
+ *
+ * The new file may be re-executed, and will contain any data modifications
+ * made to the original image up until the time dynodump(3x) was called.
+ *
+ * The original image may have undergone relocations (performed by ld.so.1)
+ * prior to control being transferred to the image. These relocations will
+ * reside as the data copied from the image. To prevent subsequent executions
+ * of the new image from undergoing the same relocations, any relocation entries
+ * (besides copy or jump slot relocations) are nulled out. Note that copy
+ * relocations such as required for __iob must be reinitialized each time the
+ * process starts, so it is not sufficient to simply null out the .dynamic
+ * sections relocation information. The effect of this is that if the new
+ * image was bound to definitions in any shared object dependencies, then these
+ * dependencies *must* reside in the same location as when dynodump(3x) was
+ * called. Any changes to the shared object dependencies of the new image, or
+ * uses of such things as LD_PRELOAD, may result in the bindings encoded in the
+ * image becoming invalid.
+ *
+ * The following flags modify the data of the image created:
+ *
+ * RTLD_SAVREL save the original relocation data. Under this option any
+ * relocation offset is reset to contain the same data as was
+ * found in the images original file.
+ *
+ * This option allows relocation information to be retained in the
+ * new image so that it may be re-executed when the new image is
+ * run. This allows far greater flexibility as the new image can
+ * now take advantage of new shared objects.
+ *
+ * Note. under this mechanism, any data item that undergoes
+ * relocation and is then further modified during the execution of
+ * the image before dynodump(3x) is called will lose the
+ * modification that occured during the applications execution.
+ *
+ * N.B. The above commentary is not quite correct in the flags have been hardwired
+ * to RTLD_SAVREL.
+ */
+#pragma ident "@(#) $Id: dynodump.c,v 1.6 1998/03/31 20:10:55 steve Exp $ - SMI"
+
+#define __EXTENSIONS__ 1
+
+#include <sys/param.h>
+#include <sys/procfs.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <libelf.h>
+#include <link.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <malloc.h>
+#include "machdep.h"
+#include "_dynodump.h"
+
+/*
+ * Generic elf error message generator
+ */
+static int
+elferr(const char * str)
+{
+ fprintf(stderr, "%s: %s\n", str, elf_errmsg(elf_errno()));
+ return (1);
+}
+
+int dynodump (const char * file);
+int
+dynodump(const char * file)
+{
+ Elf *ielf, *oelf;
+ Ehdr *iehdr, *oehdr;
+ Phdr *iphdr, *ophdr, *data_phdr = 0;
+ Cache *icache, *ocache, *_icache, *_ocache;
+ Cache *data_cache = 0, *shstr_cache = 0;
+ Cache *heap_cache = 0;
+ Word heap_sz = 0;
+ Elf_Scn *scn;
+ Shdr *shdr;
+ Elf_Data *data, rundata;
+ Half ndx, _ndx;
+ int fd, _fd;
+ Addr edata, _addr;
+ char *istrs, *ostrs, *_ostrs, proc[16];
+ const char heap[] = ".heap";
+ prstatus_t pstat;
+
+ /* make a call to the processor specific un-init stuff */
+ dynodump_uninit();
+
+ /*
+ * Obtain a file descriptor for this process,
+ * for the executable and get a prstatus_t
+ * structure.
+ */
+ sprintf(proc, "/proc/%ld", getpid());
+ if (((_fd = open(proc, O_RDONLY, 0)) == -1) ||
+ ((fd = ioctl(_fd, PIOCOPENM, (void *)0)) == -1) ||
+ (ioctl(_fd, PIOCSTATUS, &pstat) == -1)) {
+ fprintf(stderr, "/proc: initialization error: %s\n",
+ strerror(errno));
+ close(_fd);
+ return (1);
+ }
+ close(_fd);
+
+ /*
+ * Initialize with the ELF library and make sure this is an executable
+ * ELF file we're dealing with.
+ */
+ elf_version(EV_CURRENT);
+ if ((ielf = elf_begin(fd, ELF_C_READ, NULL)) == NULL) {
+ close(fd);
+ return (elferr("elf_begin"));
+ }
+ close(fd);
+
+ if ((elf_kind(ielf) != ELF_K_ELF) ||
+ ((iehdr = elf_getehdr(ielf)) == NULL) ||
+ (iehdr->e_type != ET_EXEC)) {
+ fprintf(stderr, "image is not an ELF executable\n");
+ elf_end(ielf);
+ return (1);
+ }
+ /*
+ * Elf_elf_header(iehdr);
+ */
+
+ /*
+ * Create the new output file.
+ */
+ if ((fd = open(file, O_RDWR | O_CREAT | O_TRUNC, 0777)) == -1) {
+ fprintf(stderr, "%s: open failed: %s\n", file,
+ strerror(errno));
+ elf_end(ielf);
+ return (1);
+ }
+ if ((oelf = elf_begin(fd, ELF_C_WRITE, NULL)) == NULL) {
+ elf_end(ielf);
+ close(fd);
+ return (elferr("elf_begin"));
+ }
+
+ /*
+ * Obtain the input program headers. Remember the data segments
+ * program header entry as this will be updated later to reflect the
+ * new .heap sections size.
+ */
+ if ((iphdr = elf_getphdr(ielf)) == NULL)
+ return (elferr("elf_getphdr"));
+
+ for (ndx = 0, ophdr = iphdr; ndx != iehdr->e_phnum; ndx++, ophdr++) {
+ /*
+ * Save the program header that contains the NOBITS section, or
+ * the last loadable program header if no NOBITS exists.
+ * A NOBITS section translates to a memory size requirement that
+ * is greater than the file data it is mapped from.
+ */
+ if (ophdr->p_type == PT_LOAD) {
+ if (ophdr->p_filesz != ophdr->p_memsz)
+ data_phdr = ophdr;
+ else if (data_phdr) {
+ if (data_phdr->p_vaddr < ophdr->p_vaddr)
+ data_phdr = ophdr;
+ } else
+ data_phdr = ophdr;
+ }
+ }
+ if (data_phdr == 0) {
+ fprintf(stderr, "no data segment found!\n");
+ return (0);
+ }
+
+ /*
+ * Obtain the input files section header string table.
+ */
+ if ((scn = elf_getscn(ielf, iehdr->e_shstrndx)) == NULL)
+ return (elferr("elf_getscn"));
+ if ((data = elf_getdata(scn, NULL)) == NULL)
+ return (elferr("elf_getdata"));
+ istrs = (char *) data->d_buf;
+
+ /*
+ * Construct a cache to maintain the input files section information.
+ */
+ if ((icache = (Cache *) malloc(iehdr->e_shnum * sizeof (Cache))) == 0) {
+ fprintf(stderr, "malloc failed: %s\n", strerror(errno));
+ return (1);
+ }
+ _icache = icache;
+ _icache++;
+
+ /*
+ * Traverse each section from the input file.
+ */
+ for (ndx = 1, scn = 0;
+ (_icache->c_scn = elf_nextscn(ielf, scn));
+ ndx++, scn = _icache->c_scn, _icache++) {
+
+ if ((_icache->c_shdr = shdr = elf_getshdr(_icache->c_scn)) == NULL)
+ return (elferr("elf_getshdr"));
+
+ if ((_icache->c_data = elf_getdata(_icache->c_scn, NULL)) == NULL)
+ return (elferr("elf_getdata"));
+
+ _icache->c_name = istrs + (size_t)(shdr->sh_name);
+
+ /*
+ * For each section that has a virtual address reestablish the
+ * data buffer to point to the memory image.
+ *
+ * if (shdr->sh_addr)
+ * _icache->c_data->d_buf = (void *)shdr->sh_addr;
+ */
+
+ /*
+ * Remember the last section of the data segment, the new .heap
+ * section will be added after this section.
+ * If we already have one, then set data_cache to the previous
+ * section and set heap_cache to this one.
+ */
+ if ((shdr->sh_addr + shdr->sh_size)
+ == (data_phdr->p_vaddr + data_phdr->p_memsz)) {
+ if (strcmp(_icache->c_name, heap) == 0) {
+#ifdef DEBUG
+ printf("Found a previous .heap section\n");
+#endif
+ data_cache = _icache - 1;
+ heap_cache = _icache;
+ heap_sz = shdr->sh_size;
+ } else {
+ data_cache = _icache;
+ }
+ }
+
+ /*
+ * Remember the section header string table as this will be
+ * rewritten with the new .heap name.
+ */
+ if ((shdr->sh_type == SHT_STRTAB) &&
+ ((strcmp(_icache->c_name, ".shstrtab")) == 0))
+ shstr_cache = _icache;
+ }
+ if (data_cache == 0) {
+ fprintf(stderr, "final data section not found!\n");
+ return (0);
+ }
+
+ /*
+ * Determine the new .heap section to create.
+ */
+ rundata.d_buf = (void *)(data_cache->c_shdr->sh_addr +
+ data_cache->c_shdr->sh_size);
+ rundata.d_size = (int)sbrk(0) - (int)rundata.d_buf;
+ rundata.d_type = ELF_T_BYTE;
+ rundata.d_off = 0;
+ rundata.d_align = 1;
+ rundata.d_version = EV_CURRENT;
+
+ /*
+ * From the new data buffer determine the new value for _end and _edata.
+ * This will also be used to update the data segment program header.
+ *
+ * If we had a .heap section, then its size is part of the program
+ * headers notion of data size. Because we're only going to output one
+ * heap section (ignoring the one in the running binary) we need to
+ * subract the size of that which we're ignoring.
+ */
+ if (heap_cache) {
+ edata = S_ROUND((data_phdr->p_vaddr
+ + data_phdr->p_memsz
+ - heap_sz), rundata.d_align) + rundata.d_size;
+ } else {
+ edata = S_ROUND((data_phdr->p_vaddr + data_phdr->p_memsz),
+ rundata.d_align) + rundata.d_size;
+ }
+
+ /*
+ * We're now ready to construct the new elf image.
+ *
+ * Obtain a new elf header and initialize it with any basic information
+ * that isn't calculated as part of elf_update(). Bump the section
+ * header string table index to account for the .heap section we'll be
+ * adding.
+ */
+ if ((oehdr = elf_newehdr(oelf)) == NULL)
+ return (elferr("elf_newehdr"));
+
+ oehdr->e_entry = iehdr->e_entry;
+ oehdr->e_machine = iehdr->e_machine;
+ oehdr->e_type = iehdr->e_type;
+ oehdr->e_flags = iehdr->e_flags;
+ /*
+ * If we already have a heap section, we don't need any adjustment
+ */
+ if (heap_cache)
+ oehdr->e_shstrndx = iehdr->e_shstrndx;
+ else
+ oehdr->e_shstrndx = iehdr->e_shstrndx + 1;
+
+#ifdef DEBUG
+ printf("iehdr->e_flags = %x\n", iehdr->e_flags);
+ printf("iehdr->e_entry = %x\n", iehdr->e_entry);
+ printf("iehdr->e_shstrndx= %d\n", iehdr->e_shstrndx);
+ printf("iehdr->e_machine = %d\n", iehdr->e_machine);
+ printf("iehdr->e_type = 0x%x\n", iehdr->e_type);
+ printf("oehdr->e_machine = %d\n", oehdr->e_machine);
+ printf("oehdr->e_type = 0x%x\n", oehdr->e_type);
+#endif
+
+ /*
+ * Obtain a new set of program headers. Initialize these with the same
+ * information as the input program headers and update the data segment
+ * to reflect the new .heap section.
+ */
+ if ((ophdr = elf_newphdr(oelf, iehdr->e_phnum)) == NULL)
+ return (elferr("elf_newphdr"));
+
+ for (ndx = 0; ndx != iehdr->e_phnum; ndx++, iphdr++, ophdr++) {
+ *ophdr = *iphdr;
+ if (data_phdr == iphdr)
+ ophdr->p_filesz = ophdr->p_memsz = edata - ophdr->p_vaddr;
+ }
+
+ /*
+ * Obtain a new set of sections.
+ */
+ _icache = icache;
+ _icache++;
+ for (ndx = 1; ndx != iehdr->e_shnum; ndx++, _icache++) {
+ /*
+ * Skip the heap section of the running executable
+ */
+ if (_icache == heap_cache)
+ continue;
+ /*
+ * Create a matching section header in the output file.
+ */
+ if ((scn = elf_newscn(oelf)) == NULL)
+ return (elferr("elf_newscn"));
+ if ((shdr = elf_getshdr(scn)) == NULL)
+ return (elferr("elf_getshdr"));
+ *shdr = *_icache->c_shdr;
+
+ /*
+ * Create a matching data buffer for this section.
+ */
+ if ((data = elf_newdata(scn)) == NULL)
+ return (elferr("elf_newdata"));
+ *data = *_icache->c_data;
+
+ /*
+ * For each section that has a virtual address reestablish the
+ * data buffer to point to the memory image. Note, we skip
+ * the plt section.
+ */
+ if ((shdr->sh_addr) && (!((shdr->sh_type == SHT_PROGBITS)
+ && (strcmp(_icache->c_name, ".plt") == 0))))
+ data->d_buf = (void *)shdr->sh_addr;
+
+ /*
+ * Update any NOBITS section to indicate that it now contains
+ * data.
+ */
+ if (shdr->sh_type == SHT_NOBITS)
+ shdr->sh_type = SHT_PROGBITS;
+
+ /*
+ * Add the new .heap section after the last section of the
+ * present data segment. If we had a heap section, then
+ * this is the section preceding it.
+ */
+ if (data_cache == _icache) {
+ if ((scn = elf_newscn(oelf)) == NULL)
+ return (elferr("elf_newscn"));
+ if ((shdr = elf_getshdr(scn)) == NULL)
+ return (elferr("elf_getshdr"));
+ shdr->sh_type = SHT_PROGBITS;
+ shdr->sh_flags = SHF_ALLOC | SHF_WRITE;
+
+ if ((data = elf_newdata(scn)) == NULL)
+ return (elferr("elf_newdata"));
+ *data = rundata;
+ }
+
+ /*
+ * Update the section header string table size to reflect the
+ * new section name (only if we didn't already have a heap).
+ */
+ if (!heap_cache) {
+ if (shstr_cache && (shstr_cache == _icache)) {
+ data->d_size += sizeof (heap);
+ }
+ }
+ }
+
+ /*
+ * Write out the new image, and obtain a new elf descriptor that will
+ * allow us to write to the new image.
+ */
+ if (elf_update(oelf, ELF_C_WRITE) == -1)
+ return (elferr("elf_update"));
+ elf_end(oelf);
+ if ((oelf = elf_begin(fd, ELF_C_RDWR, NULL)) == NULL)
+ return (elferr("elf_begin"));
+ if ((oehdr = elf_getehdr(oelf)) == NULL)
+ return (elferr("elf_getehdr"));
+
+ /*
+ * Obtain the output files section header string table.
+ */
+ if ((scn = elf_getscn(oelf, oehdr->e_shstrndx)) == NULL)
+ return (elferr("elf_getscn"));
+ if ((data = elf_getdata(scn, NULL)) == NULL)
+ return (elferr("elf_getdata"));
+ ostrs = _ostrs = (char *) data->d_buf;
+ *_ostrs++ = '\0';
+
+ /*
+ * Construct a cache to maintain the output files section information.
+ */
+ if ((ocache = (Cache *)malloc(oehdr->e_shnum * sizeof (Cache))) == 0) {
+ fprintf(stderr, "malloc failed: %s\n", strerror(errno));
+ return (1);
+ }
+ _ocache = ocache;
+ _ocache++;
+ _icache = icache;
+ _icache++;
+
+ /*
+ * Traverse each section from the input file rebuilding the section
+ * header string table as we go.
+ */
+ _ndx = _addr = 0;
+ for (ndx = 1, scn = 0;
+ (_ocache->c_scn = elf_nextscn(oelf, scn));
+ ndx++, scn = _ocache->c_scn, _ocache++, _icache++) {
+
+ const char *strs;
+
+ if (_icache == heap_cache) {
+#ifdef DEBUG
+ printf("ignoring .heap section in input\n");
+#endif
+ _icache++;
+ }
+
+ if ((_ocache->c_shdr = shdr =
+ elf_getshdr(_ocache->c_scn)) == NULL)
+ return (elferr("elf_getshdr"));
+ if ((_ocache->c_data =
+ elf_getdata(_ocache->c_scn, NULL)) == NULL)
+ return (elferr("elf_getdata"));
+
+ /*
+ * If were inserting the new .heap section, insert the new
+ * section name and initialize its virtual address.
+ */
+ if (_addr) {
+ strs = heap;
+ shdr->sh_addr = S_ROUND(_addr, shdr->sh_addralign);
+ _addr = 0;
+ } else {
+ strs = istrs + (size_t)(_icache->c_shdr->sh_name);
+ }
+
+ strcpy(_ostrs, strs);
+ shdr->sh_name = _ostrs - ostrs;
+ _ocache->c_name = _ostrs;
+ _ostrs += strlen(strs) + 1;
+
+ /*
+ * If we've inserted a new section any later section may need
+ * their sh_link fields updated.
+ * If we already had a heap section, then this is not required.
+ */
+ if (!heap_cache) {
+ if (_ndx) {
+ if (_ocache->c_shdr->sh_link >= _ndx)
+ _ocache->c_shdr->sh_link++;
+ }
+ }
+
+ /*
+ * If this is the last section of the original data segment
+ * determine sufficient information to initialize the new .heap
+ * section which will be obtained next.
+ */
+ if (data_cache == _icache) {
+ _ndx = ndx + 1;
+ _addr = shdr->sh_addr + shdr->sh_size;
+ _icache--;
+ data_cache = 0;
+ }
+ }
+
+ /*
+ * Now that we have a complete description of the new image update any
+ * sections that are required.
+ *
+ * o update the value of _edata and _end.
+ *
+ * o reset any relocation entries if necessary.
+ */
+ _ocache = &ocache[1];
+ _icache = &icache[1];
+ for (ndx = 1; ndx < oehdr->e_shnum; ndx++, _ocache++, _icache++) {
+ if ((_ocache->c_shdr->sh_type == SHT_SYMTAB) ||
+ (_ocache->c_shdr->sh_type == SHT_DYNSYM))
+ update_sym(ocache, _ocache, edata);
+
+ if (_ocache->c_shdr->sh_type == M_REL_SHT_TYPE)
+ update_reloc(ocache, _ocache, icache, _icache, oehdr->e_shnum);
+ }
+
+ if (elf_update(oelf, ELF_C_WRITE) == -1)
+ return (elferr("elf_update"));
+
+ elf_end(oelf);
+ elf_end(ielf);
+ return (0);
+}
projects / chise / xemacs-chise.git / blobdiff