Squashed 'third_party/elfutils/' content from commit 555e15e
Change-Id: I61cde98949e47e5c8c09c33260de17f30921be79
git-subtree-dir: third_party/elfutils
git-subtree-split: 555e15ebe8bf1eb33d00747173cfc80cc65648a4
diff --git a/backends/alpha_symbol.c b/backends/alpha_symbol.c
new file mode 100644
index 0000000..657d9ee
--- /dev/null
+++ b/backends/alpha_symbol.c
@@ -0,0 +1,156 @@
+/* Alpha specific symbolic name handling.
+ Copyright (C) 2002-2011 Red Hat, Inc.
+ This file is part of elfutils.
+ Written by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+ This file is free software; you can redistribute it and/or modify
+ it under the terms of either
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at
+ your option) any later version
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at
+ your option) any later version
+
+ or both in parallel, as here.
+
+ elfutils 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
+ General Public License for more details.
+
+ You should have received copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <elf.h>
+#include <stddef.h>
+#include <string.h>
+
+#define BACKEND alpha_
+#include "libebl_CPU.h"
+
+
+const char *
+alpha_dynamic_tag_name (int64_t tag, char *buf __attribute__ ((unused)),
+ size_t len __attribute__ ((unused)))
+{
+ switch (tag)
+ {
+ case DT_ALPHA_PLTRO:
+ return "ALPHA_PLTRO";
+ default:
+ break;
+ }
+ return NULL;
+}
+
+bool
+alpha_dynamic_tag_check (int64_t tag)
+{
+ return tag == DT_ALPHA_PLTRO;
+}
+
+/* Check for the simple reloc types. */
+Elf_Type
+alpha_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type)
+{
+ switch (type)
+ {
+ case R_ALPHA_REFLONG:
+ return ELF_T_WORD;
+ case R_ALPHA_REFQUAD:
+ return ELF_T_XWORD;
+ default:
+ return ELF_T_NUM;
+ }
+}
+
+
+/* Check whether SHF_MASKPROC flags are valid. */
+bool
+alpha_machine_section_flag_check (GElf_Xword sh_flags)
+{
+ return (sh_flags &~ (SHF_ALPHA_GPREL)) == 0;
+}
+
+bool
+alpha_check_special_section (Ebl *ebl,
+ int ndx __attribute__ ((unused)),
+ const GElf_Shdr *shdr,
+ const char *sname __attribute__ ((unused)))
+{
+ if ((shdr->sh_flags
+ & (SHF_WRITE | SHF_EXECINSTR)) == (SHF_WRITE | SHF_EXECINSTR)
+ && shdr->sh_addr != 0)
+ {
+ /* This is ordinarily flagged, but is valid for an old-style PLT.
+
+ Look for the SHT_DYNAMIC section and the DT_PLTGOT tag in it.
+ Its d_ptr should match the .plt section's sh_addr. */
+
+ Elf_Scn *scn = NULL;
+ while ((scn = elf_nextscn (ebl->elf, scn)) != NULL)
+ {
+ GElf_Shdr scn_shdr;
+ if (likely (gelf_getshdr (scn, &scn_shdr) != NULL)
+ && scn_shdr.sh_type == SHT_DYNAMIC
+ && scn_shdr.sh_entsize != 0)
+ {
+ GElf_Addr pltgot = 0;
+ Elf_Data *data = elf_getdata (scn, NULL);
+ if (data != NULL)
+ for (size_t i = 0; i < data->d_size / scn_shdr.sh_entsize; ++i)
+ {
+ GElf_Dyn dyn;
+ if (unlikely (gelf_getdyn (data, i, &dyn) == NULL))
+ break;
+ if (dyn.d_tag == DT_PLTGOT)
+ pltgot = dyn.d_un.d_ptr;
+ else if (dyn.d_tag == DT_ALPHA_PLTRO && dyn.d_un.d_val != 0)
+ return false; /* This PLT should not be writable. */
+ }
+ return pltgot == shdr->sh_addr;
+ }
+ }
+ }
+
+ return false;
+}
+
+/* Check whether given symbol's st_value and st_size are OK despite failing
+ normal checks. */
+bool
+alpha_check_special_symbol (Elf *elf __attribute__ ((unused)),
+ GElf_Ehdr *ehdr __attribute__ ((unused)),
+ const GElf_Sym *sym __attribute__ ((unused)),
+ const char *name,
+ const GElf_Shdr *destshdr __attribute__ ((unused)))
+{
+ if (name == NULL)
+ return false;
+
+ if (strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0)
+ /* On Alpha any place in the section is valid. */
+ return true;
+
+ return false;
+}
+
+/* Check whether only valid bits are set on the st_other symbol flag.
+ Standard ST_VISIBILITY have already been masked off. */
+bool
+alpha_check_st_other_bits (unsigned char st_other)
+{
+ return ((((st_other & STO_ALPHA_STD_GPLOAD) == STO_ALPHA_NOPV)
+ || ((st_other & STO_ALPHA_STD_GPLOAD) == STO_ALPHA_STD_GPLOAD))
+ && (st_other &~ STO_ALPHA_STD_GPLOAD) == 0);
+}