Imported Upstream version 0.8.13upstream

1 files changed, 205 insertions, 0 deletions

diff --git a/lib/opt.delscn.c b/lib/opt.delscn.c
new file mode 100644
index 0000000..2201155
--- /dev/null
+++ b/lib/opt.delscn.c
@@ -0,0 +1,205 @@
+/*
+opt.delscn.c - implementation of the elf_delscn(3) function.
+Copyright (C) 1995 - 2001 Michael Riepe
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+This library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+*/
+
+#include <private.h>
+
+#ifndef lint
+static const char rcsid[] = "@(#) $Id: opt.delscn.c,v 1.12 2008/05/23 08:15:35 michael Exp $";
+#endif /* lint */
+
+static size_t
+_newindex(size_t old, size_t index) {
+    return old == index ? SHN_UNDEF : (old > index ? old - 1 : old);
+}
+
+static void
+_elf32_update_shdr(Elf *elf, size_t index) {
+    Elf32_Shdr *shdr;
+    Elf_Scn *scn;
+
+    ((Elf32_Ehdr*)elf->e_ehdr)->e_shnum = elf->e_scn_n->s_index + 1;
+    for (scn = elf->e_scn_1; scn; scn = scn->s_link) {
+	shdr = &scn->s_shdr32;
+	switch (shdr->sh_type) {
+	    case SHT_REL:
+	    case SHT_RELA:
+		shdr->sh_info = _newindex(shdr->sh_info, index);
+		/* fall through */
+	    case SHT_DYNSYM:
+	    case SHT_DYNAMIC:
+	    case SHT_HASH:
+	    case SHT_SYMTAB:
+#if __LIBELF_SYMBOL_VERSIONS
+#if __LIBELF_SUN_SYMBOL_VERSIONS
+	    case SHT_SUNW_verdef:
+	    case SHT_SUNW_verneed:
+	    case SHT_SUNW_versym:
+#else /* __LIBELF_SUN_SYMBOL_VERSIONS */
+	    case SHT_GNU_verdef:
+	    case SHT_GNU_verneed:
+	    case SHT_GNU_versym:
+#endif /* __LIBELF_SUN_SYMBOL_VERSIONS */
+#endif /* __LIBELF_SYMBOL_VERSIONS */
+		shdr->sh_link = _newindex(shdr->sh_link, index);
+		/* fall through */
+	    default:
+		break;
+	}
+    }
+}
+
+#if __LIBELF64
+
+static void
+_elf64_update_shdr(Elf *elf, size_t index) {
+    Elf64_Shdr *shdr;
+    Elf_Scn *scn;
+
+    ((Elf64_Ehdr*)elf->e_ehdr)->e_shnum = elf->e_scn_n->s_index + 1;
+    for (scn = elf->e_scn_1; scn; scn = scn->s_link) {
+	shdr = &scn->s_shdr64;
+	switch (shdr->sh_type) {
+	    case SHT_REL:
+	    case SHT_RELA:
+		shdr->sh_info = _newindex(shdr->sh_info, index);
+		/* fall through */
+	    case SHT_DYNSYM:
+	    case SHT_DYNAMIC:
+	    case SHT_HASH:
+	    case SHT_SYMTAB:
+#if __LIBELF_SYMBOL_VERSIONS
+#if __LIBELF_SUN_SYMBOL_VERSIONS
+	    case SHT_SUNW_verdef:
+	    case SHT_SUNW_verneed:
+	    case SHT_SUNW_versym:
+#else /* __LIBELF_SUN_SYMBOL_VERSIONS */
+	    case SHT_GNU_verdef:
+	    case SHT_GNU_verneed:
+	    case SHT_GNU_versym:
+#endif /* __LIBELF_SUN_SYMBOL_VERSIONS */
+#endif /* __LIBELF_SYMBOL_VERSIONS */
+		shdr->sh_link = _newindex(shdr->sh_link, index);
+		/* fall through */
+	    default:
+		break;
+	}
+    }
+}
+
+#endif /* __LIBELF64 */
+
+size_t
+elf_delscn(Elf *elf, Elf_Scn *scn) {
+    Elf_Scn *pscn;
+    Scn_Data *sd;
+    Scn_Data *tmp;
+    size_t index;
+
+    if (!elf || !scn) {
+	return SHN_UNDEF;
+    }
+    elf_assert(elf->e_magic == ELF_MAGIC);
+    elf_assert(scn->s_magic == SCN_MAGIC);
+    elf_assert(elf->e_ehdr);
+    if (scn->s_elf != elf) {
+	seterr(ERROR_ELFSCNMISMATCH);
+	return SHN_UNDEF;
+    }
+    elf_assert(elf->e_scn_1);
+    if (scn == elf->e_scn_1) {
+	seterr(ERROR_NULLSCN);
+	return SHN_UNDEF;
+    }
+
+    /*
+     * Find previous section.
+     */
+    for (pscn = elf->e_scn_1; pscn->s_link; pscn = pscn->s_link) {
+	if (pscn->s_link == scn) {
+	    break;
+	}
+    }
+    if (pscn->s_link != scn) {
+	seterr(ERROR_ELFSCNMISMATCH);
+	return SHN_UNDEF;
+    }
+    /*
+     * Unlink section.
+     */
+    if (elf->e_scn_n == scn) {
+	elf->e_scn_n = pscn;
+    }
+    pscn->s_link = scn->s_link;
+    index = scn->s_index;
+    /*
+     * Free section descriptor and data.
+     */
+    for (sd = scn->s_data_1; sd; sd = tmp) {
+	elf_assert(sd->sd_magic == DATA_MAGIC);
+	elf_assert(sd->sd_scn == scn);
+	tmp = sd->sd_link;
+	if (sd->sd_free_data && sd->sd_memdata) {
+	    free(sd->sd_memdata);
+	}
+	if (sd->sd_freeme) {
+	    free(sd);
+	}
+    }
+    if ((sd = scn->s_rawdata)) {
+	elf_assert(sd->sd_magic == DATA_MAGIC);
+	elf_assert(sd->sd_scn == scn);
+	if (sd->sd_free_data && sd->sd_memdata) {
+	    free(sd->sd_memdata);
+	}
+	if (sd->sd_freeme) {
+	    free(sd);
+	}
+    }
+    if (scn->s_freeme) {
+	elf_assert(scn->s_index > 0);
+	free(scn);
+    }
+    /*
+     * Adjust section indices.
+     */
+    for (scn = pscn->s_link; scn; scn = scn->s_link) {
+	elf_assert(scn->s_index > index);
+	scn->s_index--;
+    }
+    /*
+     * Adjust ELF header and well-known section headers.
+     */
+    if (elf->e_class == ELFCLASS32) {
+	_elf32_update_shdr(elf, index);
+	return index;
+    }
+#if __LIBELF64
+    else if (elf->e_class == ELFCLASS64) {
+	_elf64_update_shdr(elf, index);
+	return index;
+    }
+#endif /* __LIBELF64 */
+    else if (valid_class(elf->e_class)) {
+	seterr(ERROR_UNIMPLEMENTED);
+    }
+    else {
+	seterr(ERROR_UNKNOWN_CLASS);
+    }
+    return SHN_UNDEF;
+}