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-rw-r--r--ext/libelf/gelf_dyn.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/ext/libelf/gelf_dyn.c b/ext/libelf/gelf_dyn.c
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+++ b/ext/libelf/gelf_dyn.c
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+/*-
+ * 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.
+ */
+
+#include <assert.h>
+#include <limits.h>
+
+#include "gelf.h"
+#include "_libelf.h"
+
+GElf_Dyn *
+gelf_getdyn(Elf_Data *d, int ndx, GElf_Dyn *dst)
+{
+ int ec;
+ Elf *e;
+ Elf_Scn *scn;
+ Elf32_Dyn *dyn32;
+ Elf64_Dyn *dyn64;
+ size_t msz;
+ uint32_t sh_type;
+
+ if (d == NULL || ndx < 0 || dst == NULL ||
+ (scn = d->d_scn) == NULL ||
+ (e = scn->s_elf) == NULL) {
+ LIBELF_SET_ERROR(ARGUMENT, 0);
+ return (NULL);
+ }
+
+ ec = e->e_class;
+ assert(ec == ELFCLASS32 || ec == ELFCLASS64);
+
+ if (ec == ELFCLASS32)
+ sh_type = scn->s_shdr.s_shdr32.sh_type;
+ else
+ sh_type = scn->s_shdr.s_shdr64.sh_type;
+
+ if (_libelf_xlate_shtype(sh_type) != ELF_T_DYN) {
+ LIBELF_SET_ERROR(ARGUMENT, 0);
+ return (NULL);
+ }
+
+ msz = _libelf_msize(ELF_T_DYN, ec, e->e_version);
+
+ assert(msz > 0);
+
+ if (msz * ndx >= d->d_size) {
+ LIBELF_SET_ERROR(ARGUMENT, 0);
+ return (NULL);
+ }
+
+ if (ec == ELFCLASS32) {
+ dyn32 = (Elf32_Dyn *) d->d_buf + ndx;
+
+ dst->d_tag = dyn32->d_tag;
+ dst->d_un.d_val = (Elf64_Xword) dyn32->d_un.d_val;
+
+ } else {
+
+ dyn64 = (Elf64_Dyn *) d->d_buf + ndx;
+
+ *dst = *dyn64;
+ }
+
+ return (dst);
+}
+
+int
+gelf_update_dyn(Elf_Data *d, int ndx, GElf_Dyn *ds)
+{
+ int ec;
+ Elf *e;
+ Elf_Scn *scn;
+ Elf32_Dyn *dyn32;
+ Elf64_Dyn *dyn64;
+ size_t msz;
+ uint32_t sh_type;
+
+ if (d == NULL || ndx < 0 || ds == NULL ||
+ (scn = d->d_scn) == NULL ||
+ (e = scn->s_elf) == NULL) {
+ LIBELF_SET_ERROR(ARGUMENT, 0);
+ return (0);
+ }
+
+ ec = e->e_class;
+ assert(ec == ELFCLASS32 || ec == ELFCLASS64);
+
+ if (ec == ELFCLASS32)
+ sh_type = scn->s_shdr.s_shdr32.sh_type;
+ else
+ sh_type = scn->s_shdr.s_shdr64.sh_type;
+
+ if (_libelf_xlate_shtype(sh_type) != ELF_T_DYN) {
+ LIBELF_SET_ERROR(ARGUMENT, 0);
+ return (0);
+ }
+
+ msz = _libelf_msize(ELF_T_DYN, ec, e->e_version);
+ assert(msz > 0);
+
+ if (msz * ndx >= d->d_size) {
+ LIBELF_SET_ERROR(ARGUMENT, 0);
+ return (0);
+ }
+
+ if (ec == ELFCLASS32) {
+ dyn32 = (Elf32_Dyn *) d->d_buf + ndx;
+
+ LIBELF_COPY_S32(dyn32, ds, d_tag);
+ LIBELF_COPY_U32(dyn32, ds, d_un.d_val);
+ } else {
+ dyn64 = (Elf64_Dyn *) d->d_buf + ndx;
+
+ *dyn64 = *ds;
+ }
+
+ return (1);
+}