--- old/src/os/solaris/fix_empty_sec_hdr_flags/fix_empty_sec_hdr_flags.c Fri Nov 14 13:09:53 2014 +++ /dev/null Fri Nov 14 13:09:53 2014 @@ -1,181 +0,0 @@ -/* - * Copyright (c) 2012, 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 -#include -#include -#include -#include -#include - -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); -}