Get rid of GNU libelf and its autoconf nastiness and replace

it with FreeBSD's implementation

--HG--
extra : convert_revision : ef9c4551b9a6b54b76a89f286ff9804c55790621

1 files changed, 133 insertions, 0 deletions

diff --git a/ext/libelf/libelf_extended.c b/ext/libelf/libelf_extended.c
new file mode 100644
index 000000000..01363aafe
--- /dev/null
+++ b/ext/libelf/libelf_extended.c
@@ -0,0 +1,133 @@
+/*-
+ * 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 "libelf.h"
+
+#include "_libelf.h"
+
+/*
+ * Retrieve section #0, allocating a new section if needed.
+ */
+static Elf_Scn *
+_libelf_getscn0(Elf *e)
+{
+        Elf_Scn *s;
+
+        if ((s = STAILQ_FIRST(&e->e_u.e_elf.e_scn)) != NULL)
+                return (s);
+
+        return (_libelf_allocate_scn(e, (size_t) SHN_UNDEF));
+}
+
+int
+_libelf_setshnum(Elf *e, void *eh, int ec, size_t shnum)
+{
+        Elf_Scn *scn;
+
+        if (shnum >= SHN_LORESERVE) {
+                if ((scn = _libelf_getscn0(e)) == NULL)
+                        return (0);
+
+                assert(scn->s_ndx == SHN_UNDEF);
+
+                if (ec == ELFCLASS32)
+                        scn->s_shdr.s_shdr32.sh_size = shnum;
+                else
+                        scn->s_shdr.s_shdr64.sh_size = shnum;
+
+                (void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
+
+                shnum = 0;
+        }
+
+        if (ec == ELFCLASS32)
+                ((Elf32_Ehdr *) eh)->e_shnum = shnum;
+        else
+                ((Elf64_Ehdr *) eh)->e_shnum = shnum;
+
+
+        return (1);
+}
+
+int
+_libelf_setshstrndx(Elf *e, void *eh, int ec, size_t shstrndx)
+{
+        Elf_Scn *scn;
+
+        if (shstrndx >= SHN_LORESERVE) {
+                if ((scn = _libelf_getscn0(e)) == NULL)
+                        return (0);
+
+                assert(scn->s_ndx == SHN_UNDEF);
+
+                if (ec == ELFCLASS32)
+                        scn->s_shdr.s_shdr32.sh_link = shstrndx;
+                else
+                        scn->s_shdr.s_shdr64.sh_link = shstrndx;
+
+                (void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
+
+                shstrndx = SHN_XINDEX;
+        }
+
+        if (ec == ELFCLASS32)
+                ((Elf32_Ehdr *) eh)->e_shstrndx = shstrndx;
+        else
+                ((Elf64_Ehdr *) eh)->e_shstrndx = shstrndx;
+
+        return (1);
+}
+
+int
+_libelf_setphnum(Elf *e, void *eh, int ec, size_t phnum)
+{
+        Elf_Scn *scn;
+
+        if (phnum >= PN_XNUM) {
+                if ((scn = _libelf_getscn0(e)) == NULL)
+                        return (0);
+
+                assert(scn->s_ndx == SHN_UNDEF);
+
+                if (ec == ELFCLASS32)
+                        scn->s_shdr.s_shdr32.sh_info = phnum;
+                else
+                        scn->s_shdr.s_shdr64.sh_info = phnum;
+
+                (void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
+
+                phnum = PN_XNUM;
+        }
+
+        if (ec == ELFCLASS32)
+                ((Elf32_Ehdr *) eh)->e_phnum = phnum;
+        else
+                ((Elf64_Ehdr *) eh)->e_phnum = phnum;
+
+        return (1);
+}
+