Get rid of GNU libelf and its autoconf nastiness and replace

it with FreeBSD's implementation

--HG--
extra : convert_revision : ef9c4551b9a6b54b76a89f286ff9804c55790621

1 files changed, 143 insertions, 0 deletions

diff --git a/ext/libelf/gelf_rela.c b/ext/libelf/gelf_rela.c
new file mode 100644
index 000000000..fbd2a2cc8
--- /dev/null
+++ b/ext/libelf/gelf_rela.c
@@ -0,0 +1,143 @@
+/*-
+ * 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 <limits.h>
+
+#include <assert.h>
+#include "gelf.h"
+
+#include "_libelf.h"
+
+GElf_Rela *
+gelf_getrela(Elf_Data *d, int ndx, GElf_Rela *dst)
+{
+        int ec;
+        Elf *e;
+        Elf_Scn *scn;
+        Elf32_Rela *rela32;
+        Elf64_Rela *rela64;
+        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_RELA) {
+                LIBELF_SET_ERROR(ARGUMENT, 0);
+                return (NULL);
+        }
+
+        msz = _libelf_msize(ELF_T_RELA, ec, e->e_version);
+
+        assert(msz > 0);
+
+        if (msz * ndx >= d->d_size) {
+                LIBELF_SET_ERROR(ARGUMENT, 0);
+                return (NULL);
+        }
+
+        if (ec == ELFCLASS32) {
+                rela32 = (Elf32_Rela *) d->d_buf + ndx;
+
+                dst->r_offset = (Elf64_Addr) rela32->r_offset;
+                dst->r_info   = (Elf64_Xword) rela32->r_info;
+                dst->r_addend = (Elf64_Sxword) rela32->r_addend;
+
+        } else {
+
+                rela64 = (Elf64_Rela *) d->d_buf + ndx;
+
+                *dst = *rela64;
+        }
+
+        return (dst);
+}
+
+int
+gelf_update_rela(Elf_Data *d, int ndx, GElf_Rela *dr)
+{
+        int ec;
+        Elf *e;
+        Elf_Scn *scn;
+        Elf32_Rela *rela32;
+        Elf64_Rela *rela64;
+        size_t msz;
+        uint32_t sh_type;
+
+        if (d == NULL || ndx < 0 || dr == 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_RELA) {
+                LIBELF_SET_ERROR(ARGUMENT, 0);
+                return (0);
+        }
+
+        msz = _libelf_msize(ELF_T_RELA, ec, e->e_version);
+        assert(msz > 0);
+
+        if (msz * ndx >= d->d_size) {
+                LIBELF_SET_ERROR(ARGUMENT, 0);
+                return (0);
+        }
+
+        if (ec == ELFCLASS32) {
+                rela32 = (Elf32_Rela *) d->d_buf + ndx;
+
+                LIBELF_COPY_U32(rela32, dr, r_offset);
+                LIBELF_COPY_U32(rela32, dr, r_info);
+                LIBELF_COPY_S32(rela32, dr, r_addend);
+        } else {
+                rela64 = (Elf64_Rela *) d->d_buf + ndx;
+
+                *rela64 = *dr;
+        }
+
+        return (1);
+}