summaryrefslogtreecommitdiff
path: root/ext/libelf/libelf_phdr.c
diff options
context:
space:
mode:
Diffstat (limited to 'ext/libelf/libelf_phdr.c')
-rw-r--r--ext/libelf/libelf_phdr.c154
1 files changed, 154 insertions, 0 deletions
diff --git a/ext/libelf/libelf_phdr.c b/ext/libelf/libelf_phdr.c
new file mode 100644
index 000000000..1d7e90bca
--- /dev/null
+++ b/ext/libelf/libelf_phdr.c
@@ -0,0 +1,154 @@
+/*-
+ * Copyright (c) 2006 Joseph Koshy
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD: src/lib/libelf/libelf_phdr.c,v 1.2 2006/12/25 02:22:22 jkoshy Exp $
+ */
+
+#include <assert.h>
+#include <stdlib.h>
+
+#include "gelf.h"
+#include "libelf.h"
+#include "_libelf.h"
+
+void *
+_libelf_getphdr(Elf *e, int ec)
+{
+ size_t phnum, phentsize;
+ size_t fsz, msz;
+ uint64_t phoff;
+ Elf32_Ehdr *eh32;
+ Elf64_Ehdr *eh64;
+ void *ehdr, *phdr;
+ void (*xlator)(char *_d, char *_s, size_t _c, int _swap);
+
+ assert(ec == ELFCLASS32 || ec == ELFCLASS64);
+
+ if (e == NULL) {
+ LIBELF_SET_ERROR(ARGUMENT, 0);
+ return (NULL);
+ }
+
+ if ((phdr = (ec == ELFCLASS32 ?
+ (void *) e->e_u.e_elf.e_phdr.e_phdr32 :
+ (void *) e->e_u.e_elf.e_phdr.e_phdr64)) != NULL)
+ return (phdr);
+
+ /*
+ * Check the PHDR related fields in the EHDR for sanity.
+ */
+
+ if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
+ return (NULL);
+
+ phnum = e->e_u.e_elf.e_nphdr;
+
+ if (ec == ELFCLASS32) {
+ eh32 = (Elf32_Ehdr *) ehdr;
+ phentsize = eh32->e_phentsize;
+ phoff = (uint64_t) eh32->e_phoff;
+ } else {
+ eh64 = (Elf64_Ehdr *) ehdr;
+ phentsize = eh64->e_phentsize;
+ phoff = (uint64_t) eh64->e_phoff;
+ }
+
+ fsz = gelf_fsize(e, ELF_T_PHDR, phnum, e->e_version);
+
+ assert(fsz > 0);
+
+ if ((uint64_t) e->e_rawsize < (phoff + fsz)) {
+ LIBELF_SET_ERROR(HEADER, 0);
+ return (NULL);
+ }
+
+ msz = _libelf_msize(ELF_T_PHDR, ec, EV_CURRENT);
+
+ assert(msz > 0);
+
+ if ((phdr = calloc(phnum, msz)) == NULL) {
+ LIBELF_SET_ERROR(RESOURCE, 0);
+ return (NULL);
+ }
+
+ if (ec == ELFCLASS32)
+ e->e_u.e_elf.e_phdr.e_phdr32 = phdr;
+ else
+ e->e_u.e_elf.e_phdr.e_phdr64 = phdr;
+
+
+ xlator = _libelf_get_translator(ELF_T_PHDR, ELF_TOMEMORY, ec);
+ (*xlator)(phdr, e->e_rawfile + phoff, phnum,
+ e->e_byteorder != LIBELF_PRIVATE(byteorder));
+
+ return (phdr);
+}
+
+void *
+_libelf_newphdr(Elf *e, int ec, size_t count)
+{
+ void *ehdr, *newphdr, *oldphdr;
+ size_t msz;
+
+ if (e == NULL) {
+ LIBELF_SET_ERROR(ARGUMENT, 0);
+ return (NULL);
+ }
+
+ if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL) {
+ LIBELF_SET_ERROR(SEQUENCE, 0);
+ return (NULL);
+ }
+
+ assert(e->e_class == ec);
+ assert(ec == ELFCLASS32 || ec == ELFCLASS64);
+ assert(e->e_version == EV_CURRENT);
+
+ msz = _libelf_msize(ELF_T_PHDR, ec, e->e_version);
+
+ assert(msz > 0);
+
+ newphdr = NULL;
+ if (count > 0 && (newphdr = calloc(count, msz)) == NULL) {
+ LIBELF_SET_ERROR(RESOURCE, 0);
+ return (NULL);
+ }
+
+ if (ec == ELFCLASS32) {
+ if ((oldphdr = (void *) e->e_u.e_elf.e_phdr.e_phdr32) != NULL)
+ free(oldphdr);
+ e->e_u.e_elf.e_phdr.e_phdr32 = (Elf32_Phdr *) newphdr;
+ } else {
+ if ((oldphdr = (void *) e->e_u.e_elf.e_phdr.e_phdr64) != NULL)
+ free(oldphdr);
+ e->e_u.e_elf.e_phdr.e_phdr64 = (Elf64_Phdr *) newphdr;
+ }
+
+ e->e_u.e_elf.e_nphdr = count;
+
+ elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY);
+
+ return (newphdr);
+}