///////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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// Filename: zipelf.cpp
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// Filename: zipelf.cpp
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//
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//
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// Project: Zip CPU -- a small, lightweight, RISC CPU soft core
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// Project: Zip CPU -- a small, lightweight, RISC CPU soft core
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//
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//
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// Purpose:
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// Purpose:
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//
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//
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//
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//
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// Creator: Dan Gisselquist, Ph.D.
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// Creator: Dan Gisselquist, Ph.D.
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// Gisselquist Technology, LLC
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// Gisselquist Technology, LLC
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//
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//
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///////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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// Copyright (C) 2015-2016, Gisselquist Technology, LLC
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// Copyright (C) 2015-2017, Gisselquist Technology, LLC
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//
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//
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// This program is free software (firmware): you can redistribute it and/or
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// This program is free software (firmware): you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as published
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// modify it under the terms of the GNU General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or (at
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// by the Free Software Foundation, either version 3 of the License, or (at
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// your option) any later version.
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// your option) any later version.
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//
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
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// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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// for more details.
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//
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//
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// You should have received a copy of the GNU General Public License along
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// with this program. (It's in the $(ROOT)/doc directory. Run make with no
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// target there if the PDF file isn't present.) If not, see
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// <http://www.gnu.org/licenses/> for a copy.
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//
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// License: GPL, v3, as defined and found on www.gnu.org,
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// License: GPL, v3, as defined and found on www.gnu.org,
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// http://www.gnu.org/licenses/gpl.html
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// http://www.gnu.org/licenses/gpl.html
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//
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//
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//
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//
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///////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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//
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//
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#include <stdlib.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <fcntl.h>
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#include <libelf.h>
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#include <libelf.h>
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#include <assert.h>
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#include <assert.h>
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#include <gelf.h>
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#include <gelf.h>
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#include <string.h>
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#include <string.h>
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#include "zipelf.h"
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#include "zipelf.h"
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bool
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bool
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iself(const char *fname)
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iself(const char *fname)
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{
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{
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FILE *fp;
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FILE *fp;
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bool ret = true;
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bool ret = true;
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fp = fopen(fname, "rb");
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fp = fopen(fname, "rb");
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|
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if (!fp) return false;
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if (!fp) return false;
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if (0x7f != fgetc(fp)) ret = false;
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if (0x7f != fgetc(fp)) ret = false;
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if ('E' != fgetc(fp)) ret = false;
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if ('E' != fgetc(fp)) ret = false;
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if ('L' != fgetc(fp)) ret = false;
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if ('L' != fgetc(fp)) ret = false;
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if ('F' != fgetc(fp)) ret = false;
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if ('F' != fgetc(fp)) ret = false;
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fclose(fp);
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fclose(fp);
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return ret;
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return ret;
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}
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}
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void elfread(const char *fname, unsigned &entry, ELFSECTION **§ions)
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void elfread(const char *fname, unsigned &entry, ELFSECTION **§ions)
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{
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{
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Elf *e;
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Elf *e;
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int fd, i;
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int fd, i;
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size_t n;
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size_t n;
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char *id;
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char *id;
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Elf_Kind ek;
|
Elf_Kind ek;
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GElf_Ehdr ehdr;
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GElf_Ehdr ehdr;
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GElf_Phdr phdr;
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GElf_Phdr phdr;
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const bool dbg = false;
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const bool dbg = false;
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if (elf_version(EV_CURRENT) == EV_NONE) {
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if (elf_version(EV_CURRENT) == EV_NONE) {
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fprintf(stderr, "ELF library initialization err, %s\n", elf_errmsg(-1));
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fprintf(stderr, "ELF library initialization err, %s\n", elf_errmsg(-1));
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perror("O/S Err:");
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perror("O/S Err:");
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exit(EXIT_FAILURE);
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exit(EXIT_FAILURE);
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} if ((fd = open(fname, O_RDONLY, 0)) < 0) {
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} if ((fd = open(fname, O_RDONLY, 0)) < 0) {
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fprintf(stderr, "Could not open %s\n", fname);
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fprintf(stderr, "Could not open %s\n", fname);
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perror("O/S Err:");
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perror("O/S Err:");
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exit(EXIT_FAILURE);
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exit(EXIT_FAILURE);
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} if ((e = elf_begin(fd, ELF_C_READ, NULL))==NULL) {
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} if ((e = elf_begin(fd, ELF_C_READ, NULL))==NULL) {
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fprintf(stderr, "Could not run elf_begin, %s\n", elf_errmsg(-1));
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fprintf(stderr, "Could not run elf_begin, %s\n", elf_errmsg(-1));
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exit(EXIT_FAILURE);
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exit(EXIT_FAILURE);
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}
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}
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ek = elf_kind(e);
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ek = elf_kind(e);
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if (ek == ELF_K_ELF) {
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if (ek == ELF_K_ELF) {
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; // This is the kind of file we should expect
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; // This is the kind of file we should expect
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} else if (ek == ELF_K_AR) {
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} else if (ek == ELF_K_AR) {
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fprintf(stderr, "Cannot run an archive!\n");
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fprintf(stderr, "Cannot run an archive!\n");
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exit(EXIT_FAILURE);
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exit(EXIT_FAILURE);
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} else if (ek == ELF_K_NONE) {
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} else if (ek == ELF_K_NONE) {
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;
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;
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} else {
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} else {
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fprintf(stderr, "Unexpected ELF file kind!\n");
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fprintf(stderr, "Unexpected ELF file kind!\n");
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exit(EXIT_FAILURE);
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exit(EXIT_FAILURE);
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}
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}
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if (gelf_getehdr(e, &ehdr) == NULL) {
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if (gelf_getehdr(e, &ehdr) == NULL) {
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fprintf(stderr, "getehdr() failed: %s\n", elf_errmsg(-1));
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fprintf(stderr, "getehdr() failed: %s\n", elf_errmsg(-1));
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exit(EXIT_FAILURE);
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exit(EXIT_FAILURE);
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} if ((i=gelf_getclass(e)) == ELFCLASSNONE) {
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} if ((i=gelf_getclass(e)) == ELFCLASSNONE) {
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fprintf(stderr, "getclass() failed: %s\n", elf_errmsg(-1));
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fprintf(stderr, "getclass() failed: %s\n", elf_errmsg(-1));
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exit(EXIT_FAILURE);
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exit(EXIT_FAILURE);
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} if ((id = elf_getident(e, NULL)) == NULL) {
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} if ((id = elf_getident(e, NULL)) == NULL) {
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fprintf(stderr, "getident() failed: %s\n", elf_errmsg(-1));
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fprintf(stderr, "getident() failed: %s\n", elf_errmsg(-1));
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exit(EXIT_FAILURE);
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exit(EXIT_FAILURE);
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} if (i != ELFCLASS32) {
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} if (i != ELFCLASS32) {
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fprintf(stderr, "This is a 64-bit ELF file, ZipCPU ELF files are all 32-bit\n");
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fprintf(stderr, "This is a 64-bit ELF file, ZipCPU ELF files are all 32-bit\n");
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exit(EXIT_FAILURE);
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exit(EXIT_FAILURE);
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}
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}
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if (dbg) {
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if (dbg) {
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printf(" %-20s 0x%jx\n", "e_type", (uintmax_t)ehdr.e_type);
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fprintf(stderr," %-20s 0x%jx\n","e_type", (uintmax_t)ehdr.e_type);
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printf(" %-20s 0x%jx\n", "e_machine", (uintmax_t)ehdr.e_machine);
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fprintf(stderr," %-20s 0x%jx\n","e_machine", (uintmax_t)ehdr.e_machine);
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printf(" %-20s 0x%jx\n", "e_version", (uintmax_t)ehdr.e_version);
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fprintf(stderr," %-20s 0x%jx\n","e_version", (uintmax_t)ehdr.e_version);
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printf(" %-20s 0x%jx\n", "e_entry", (uintmax_t)ehdr.e_entry);
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fprintf(stderr," %-20s 0x%jx\n","e_entry",(uintmax_t)ehdr.e_entry);
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printf(" %-20s 0x%jx\n", "e_phoff", (uintmax_t)ehdr.e_phoff);
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fprintf(stderr," %-20s 0x%jx\n","e_phoff",(uintmax_t)ehdr.e_phoff);
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printf(" %-20s 0x%jx\n", "e_shoff", (uintmax_t)ehdr.e_shoff);
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fprintf(stderr," %-20s 0x%jx\n","e_shoff",(uintmax_t)ehdr.e_shoff);
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printf(" %-20s 0x%jx\n", "e_flags", (uintmax_t)ehdr.e_flags);
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fprintf(stderr," %-20s 0x%jx\n","e_flags",(uintmax_t)ehdr.e_flags);
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printf(" %-20s 0x%jx\n", "e_ehsize", (uintmax_t)ehdr.e_ehsize);
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fprintf(stderr," %-20s 0x%jx\n","e_ehsize",(uintmax_t)ehdr.e_ehsize);
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printf(" %-20s 0x%jx\n", "e_phentsize", (uintmax_t)ehdr.e_phentsize);
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fprintf(stderr," %-20s 0x%jx\n","e_phentsize", (uintmax_t)ehdr.e_phentsize);
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printf(" %-20s 0x%jx\n", "e_shentsize", (uintmax_t)ehdr.e_shentsize);
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fprintf(stderr," %-20s 0x%jx\n","e_shentsize", (uintmax_t)ehdr.e_shentsize);
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printf("\n");
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fprintf(stderr,"\n");
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}
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}
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|
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// Check whether or not this is an ELF file for the ZipCPU ...
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// Check whether or not this is an ELF file for the ZipCPU ...
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if (ehdr.e_machine != 0x0dad1) {
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if (ehdr.e_machine != 0x0dad1) {
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fprintf(stderr, "This is not a ZipCPU/8 ELF file\n");
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fprintf(stderr, "This is not a ZipCPU/8 ELF file\n");
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exit(EXIT_FAILURE);
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exit(EXIT_FAILURE);
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}
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}
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// Get our entry address
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// Get our entry address
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entry = ehdr.e_entry;
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entry = ehdr.e_entry;
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// Now, let's go look at the program header
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// Now, let's go look at the program header
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if (elf_getphdrnum(e, &n) != 0) {
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if (elf_getphdrnum(e, &n) != 0) {
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fprintf(stderr, "elf_getphdrnum() failed: %s\n", elf_errmsg(-1));
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fprintf(stderr, "elf_getphdrnum() failed: %s\n", elf_errmsg(-1));
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exit(EXIT_FAILURE);
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exit(EXIT_FAILURE);
|
}
|
}
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|
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assert(n != 0);
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assert(n != 0);
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|
|
unsigned total_octets = 0, current_offset=0, current_section=0;
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unsigned total_octets = 0, current_offset=0, current_section=0;
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for(i=0; i<(int)n; i++) {
|
for(i=0; i<(int)n; i++) {
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total_octets += sizeof(ELFSECTION *)+sizeof(ELFSECTION);
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total_octets += sizeof(ELFSECTION *)+sizeof(ELFSECTION);
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|
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if (gelf_getphdr(e, i, &phdr) != &phdr) {
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if (gelf_getphdr(e, i, &phdr) != &phdr) {
|
fprintf(stderr, "getphdr() failed: %s\n", elf_errmsg(-1));
|
fprintf(stderr, "getphdr() failed: %s\n", elf_errmsg(-1));
|
exit(EXIT_FAILURE);
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exit(EXIT_FAILURE);
|
}
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}
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|
|
if (dbg) {
|
if (dbg) {
|
printf(" %-20s 0x%x\n", "p_type", phdr.p_type);
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fprintf(stderr, " %-20s 0x%x\n", "p_type", phdr.p_type);
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printf(" %-20s 0x%jx\n", "p_offset", phdr.p_offset);
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fprintf(stderr, " %-20s 0x%jx\n", "p_offset", phdr.p_offset);
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printf(" %-20s 0x%jx\n", "p_vaddr", phdr.p_vaddr);
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fprintf(stderr, " %-20s 0x%jx\n", "p_vaddr", phdr.p_vaddr);
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printf(" %-20s 0x%jx\n", "p_paddr", phdr.p_paddr);
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fprintf(stderr, " %-20s 0x%jx\n", "p_paddr", phdr.p_paddr);
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printf(" %-20s 0x%jx\n", "p_filesz", phdr.p_filesz);
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fprintf(stderr, " %-20s 0x%jx\n", "p_filesz", phdr.p_filesz);
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printf(" %-20s 0x%jx\n", "p_memsz", phdr.p_memsz);
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fprintf(stderr, " %-20s 0x%jx\n", "p_memsz", phdr.p_memsz);
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printf(" %-20s 0x%x [", "p_flags", phdr.p_flags);
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fprintf(stderr, " %-20s 0x%x [", "p_flags", phdr.p_flags);
|
|
|
if (phdr.p_flags & PF_X) printf(" Execute");
|
if (phdr.p_flags & PF_X) fprintf(stderr, " Execute");
|
if (phdr.p_flags & PF_R) printf(" Read");
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if (phdr.p_flags & PF_R) fprintf(stderr, " Read");
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if (phdr.p_flags & PF_W) printf(" Write");
|
if (phdr.p_flags & PF_W) fprintf(stderr, " Write");
|
printf("]\n");
|
fprintf(stderr, "]\n");
|
printf(" %-20s 0x%jx\n", "p_align", phdr.p_align);
|
fprintf(stderr, " %-20s 0x%jx\n", "p_align", phdr.p_align);
|
}
|
}
|
|
|
total_octets += phdr.p_memsz;
|
total_octets += phdr.p_filesz;
|
}
|
}
|
|
|
char *d = (char *)malloc(total_octets + sizeof(ELFSECTION)+sizeof(ELFSECTION *));
|
char *d = (char *)malloc(total_octets + sizeof(ELFSECTION)+sizeof(ELFSECTION *));
|
memset(d, 0, total_octets);
|
memset(d, 0, total_octets);
|
|
|
ELFSECTION **r = sections = (ELFSECTION **)d;
|
ELFSECTION **r = sections = (ELFSECTION **)d;
|
current_offset = (n+1)*sizeof(ELFSECTION *);
|
current_offset = (n+1)*sizeof(ELFSECTION *);
|
current_section = 0;
|
current_section = 0;
|
|
|
for(i=0; i<(int)n; i++) {
|
for(i=0; i<(int)n; i++) {
|
|
if (dbg) fprintf(stderr, "Working with &d[%d]\n", current_offset);
|
r[i] = (ELFSECTION *)(&d[current_offset]);
|
r[i] = (ELFSECTION *)(&d[current_offset]);
|
|
|
if (gelf_getphdr(e, i, &phdr) != &phdr) {
|
if (gelf_getphdr(e, i, &phdr) != &phdr) {
|
fprintf(stderr, "getphdr() failed: %s\n", elf_errmsg(-1));
|
fprintf(stderr, "getphdr() failed: %s\n", elf_errmsg(-1));
|
exit(EXIT_FAILURE);
|
exit(EXIT_FAILURE);
|
}
|
}
|
|
|
if (dbg) {
|
if (dbg) {
|
printf(" %-20s 0x%jx\n", "p_offset", phdr.p_offset);
|
fprintf(stderr, " %-20s 0x%jx\n", "p_offset", phdr.p_offset);
|
printf(" %-20s 0x%jx\n", "p_vaddr", phdr.p_vaddr);
|
fprintf(stderr, " %-20s 0x%jx\n", "p_vaddr", phdr.p_vaddr);
|
printf(" %-20s 0x%jx\n", "p_paddr", phdr.p_paddr);
|
fprintf(stderr, " %-20s 0x%jx\n", "p_paddr", phdr.p_paddr);
|
printf(" %-20s 0x%jx\n", "p_filesz", phdr.p_filesz);
|
fprintf(stderr, " %-20s 0x%jx\n", "p_filesz", phdr.p_filesz);
|
printf(" %-20s 0x%jx\n", "p_memsz", phdr.p_memsz);
|
fprintf(stderr, " %-20s 0x%jx\n", "p_memsz", phdr.p_memsz);
|
printf(" %-20s 0x%x [", "p_flags", phdr.p_flags);
|
fprintf(stderr, " %-20s 0x%x [", "p_flags", phdr.p_flags);
|
|
|
if (phdr.p_flags & PF_X) printf(" Execute");
|
if (phdr.p_flags & PF_X) fprintf(stderr, " Execute");
|
if (phdr.p_flags & PF_R) printf(" Read");
|
if (phdr.p_flags & PF_R) fprintf(stderr, " Read");
|
if (phdr.p_flags & PF_W) printf(" Write");
|
if (phdr.p_flags & PF_W) fprintf(stderr, " Write");
|
printf("]\n");
|
fprintf(stderr, "]\n");
|
|
|
printf(" %-20s 0x%jx\n", "p_align", phdr.p_align);
|
fprintf(stderr, " %-20s 0x%jx\n", "p_align", phdr.p_align);
|
}
|
}
|
|
|
current_section++;
|
current_section++;
|
|
|
r[i]->m_start = phdr.p_paddr;
|
r[i]->m_start = phdr.p_paddr;
|
r[i]->m_len = phdr.p_filesz;
|
r[i]->m_len = phdr.p_filesz;
|
|
|
current_offset += phdr.p_memsz + sizeof(ELFSECTION);
|
current_offset += phdr.p_filesz + sizeof(ELFSECTION);
|
|
|
// Now, let's read in our section ...
|
// Now, let's read in our section ...
|
if (lseek(fd, phdr.p_offset, SEEK_SET) < 0) {
|
if (lseek(fd, phdr.p_offset, SEEK_SET) < 0) {
|
fprintf(stderr, "Could not seek to file position %08lx\n", phdr.p_offset);
|
fprintf(stderr, "Could not seek to file position %08lx\n", phdr.p_offset);
|
perror("O/S Err:");
|
perror("O/S Err:");
|
exit(EXIT_FAILURE);
|
exit(EXIT_FAILURE);
|
} if (phdr.p_filesz > phdr.p_memsz)
|
} if (phdr.p_filesz > phdr.p_memsz)
|
phdr.p_filesz = 0;
|
phdr.p_filesz = 0;
|
if (read(fd, r[i]->m_data, phdr.p_filesz) != (int)phdr.p_filesz) {
|
if (read(fd, r[i]->m_data, phdr.p_filesz) != (int)phdr.p_filesz) {
|
fprintf(stderr, "Didnt read entire section\n");
|
fprintf(stderr, "Didnt read entire section\n");
|
perror("O/S Err:");
|
perror("O/S Err:");
|
exit(EXIT_FAILURE);
|
exit(EXIT_FAILURE);
|
}
|
}
|
|
|
/*
|
/*
|
// Next, we need to byte swap it from big to little endian
|
// Next, we need to byte swap it from big to little endian
|
for(unsigned j=0; j<r[i]->m_len; j++)
|
for(unsigned j=0; j<r[i]->m_len; j++)
|
r[i]->m_data[j] = byteswap(r[i]->m_data[j]);
|
r[i]->m_data[j] = byteswap(r[i]->m_data[j]);
|
*/
|
*/
|
|
|
if (dbg) for(unsigned j=0; j<r[i]->m_len; j++)
|
if (dbg) for(unsigned j=0; j<r[i]->m_len; j++)
|
fprintf(stderr, "ADR[%04x] = %02x\n", r[i]->m_start+j,
|
fprintf(stderr, "ADR[%04x] = %02x\n", r[i]->m_start+j,
|
r[i]->m_data[j] & 0x0ff);
|
r[i]->m_data[j] & 0x0ff);
|
}
|
}
|
|
|
r[i] = (ELFSECTION *)(&d[current_offset]);
|
r[i] = (ELFSECTION *)(&d[current_offset]);
|
r[current_section]->m_start = 0;
|
r[current_section]->m_start = 0;
|
r[current_section]->m_len = 0;
|
r[current_section]->m_len = 0;
|
|
|
elf_end(e);
|
elf_end(e);
|
close(fd);
|
close(fd);
|
}
|
}
|
|
|
|
|
