--- a/jdk/make/src/native/fix_empty_sec_hdr_flags/fix_empty_sec_hdr_flags.c Thu Sep 10 14:55:18 2015 -0700
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,181 +0,0 @@
-/*
- * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code 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
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- *
- */
-
-/*
- * Name: fix_empty_sec_hdr_flags.c
- *
- * Description: Remove the SHF_ALLOC flag from "empty" section headers.
- * An "empty" section header has sh_addr == 0 and sh_size == 0.
- *
- * This program is adapted from the example program shown on the
- * elf(3elf) man page and from code from the Solaris compiler
- * driver.
- */
-
-#include <fcntl.h>
-#include <stdio.h>
-#include <libelf.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-static void failure(void);
-
-void
-main(int argc, char ** argv) {
- void * ehdr; /* ELF header */
- unsigned int i; /* section counter */
- int fd; /* descriptor for file */
- Elf * elf; /* ELF descriptor */
- char * elf_ident; /* ELF identity string */
- char * elf_obj; /* elf_obj file */
- int fix_count; /* number of flags fixed */
- int is_elfclass64; /* is an ELFCLASS64 file? */
- Elf_Scn * scn; /* ELF section descriptor */
- void * shdr; /* ELF section header */
- Elf_Data * shstrtab; /* ELF section header string table */
-
- if (argc != 2) {
- (void) fprintf(stderr, "Usage: %s elf_obj\n", argv[0]);
- exit(2);
- }
-
- /* open the elf_obj */
- elf_obj = argv[1];
- if ((fd = open(elf_obj, O_RDWR)) == -1) {
- (void) fprintf(stderr, "%s: cannot open file.\n", elf_obj);
- exit(3);
- }
-
- (void) printf("Opening '%s' for update\n", elf_obj);
- (void) fflush(stdout);
- (void) elf_version(EV_CURRENT); /* coordinate ELF versions */
-
- /* obtain the ELF descriptors from the input file */
- if ((elf = elf_begin(fd, ELF_C_RDWR, NULL)) == NULL) {
- failure();
- }
-
- /* determine if ELFCLASS64 or not? */
- elf_ident = elf_getident(elf, NULL);
- is_elfclass64 = (elf_ident[EI_CLASS] == ELFCLASS64);
-
- /* get the ELF header */
- if (is_elfclass64) {
- ehdr = elf64_getehdr(elf);
- } else {
- ehdr = elf32_getehdr(elf);
- }
- if (ehdr == NULL) {
- failure();
- }
-
- /* get the ELF section descriptor */
- if (is_elfclass64) {
- scn = elf_getscn(elf, ((Elf64_Ehdr *) ehdr)->e_shstrndx);
- } else {
- scn = elf_getscn(elf, ((Elf32_Ehdr *) ehdr)->e_shstrndx);
- }
- if (scn == NULL) {
- failure();
- }
-
- /* get the section header string table */
- shstrtab = elf_getdata(scn, NULL);
- if (shstrtab == NULL) {
- failure();
- }
-
- fix_count = 0;
-
- /* traverse the sections of the input file */
- for (i = 1, scn = NULL; scn = elf_nextscn(elf, scn); i++) {
- int has_flag_set; /* is SHF_ALLOC flag set? */
- int is_empty; /* is section empty? */
- char * name; /* short hand pointer */
-
- /* get the section header */
- if (is_elfclass64) {
- shdr = elf64_getshdr(scn);
- } else {
- shdr = elf32_getshdr(scn);
- }
- if (shdr == NULL) {
- failure();
- }
-
- if (is_elfclass64) {
- name = (char *)shstrtab->d_buf + ((Elf64_Shdr *) shdr)->sh_name;
- } else {
- name = (char *)shstrtab->d_buf + ((Elf32_Shdr *) shdr)->sh_name;
- }
-
- if (is_elfclass64) {
- has_flag_set = ((Elf64_Shdr *) shdr)->sh_flags & SHF_ALLOC;
- is_empty = ((Elf64_Shdr *) shdr)->sh_addr == 0 &&
- ((Elf64_Shdr *) shdr)->sh_size == 0;
- } else {
- has_flag_set = ((Elf32_Shdr *) shdr)->sh_flags & SHF_ALLOC;
- is_empty = ((Elf32_Shdr *) shdr)->sh_addr == 0 &&
- ((Elf32_Shdr *) shdr)->sh_size == 0;
- }
-
- if (is_empty && has_flag_set) {
- (void) printf("section[%u] '%s' is empty, "
- "but SHF_ALLOC flag is set.\n", i, name);
- (void) printf("Clearing the SHF_ALLOC flag.\n");
-
- if (is_elfclass64) {
- ((Elf64_Shdr *) shdr)->sh_flags &= ~SHF_ALLOC;
- } else {
- ((Elf32_Shdr *) shdr)->sh_flags &= ~SHF_ALLOC;
- }
- fix_count++;
- }
- } /* end for each ELF section */
-
- if (fix_count > 0) {
- (void) printf("Saving %d updates to '%s'\n", fix_count, elf_obj);
- (void) fflush(stdout);
- (void) elf_update(elf, ELF_C_NULL); /* recalc ELF memory structures */
- (void) elf_update(elf, ELF_C_WRITE); /* write out changes to ELF obj */
- } else {
- (void) printf("No SHF_ALLOC flags needed to be cleared.\n");
- }
-
- (void) elf_end(elf); /* done with ELF obj */
- (void) close(fd);
-
- (void) printf("Done %s '%s'\n",
- (fix_count > 0) ? "updating" : "with", elf_obj);
- (void) fflush(stdout);
- exit(0);
-} /* end main */
-
-
-static void
-failure() {
- (void) fprintf(stderr, "%s\n", elf_errmsg(elf_errno()));
- exit(6);
-}