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/ppc_symbol.c b/backends/ppc_symbol.c
new file mode 100644
index 0000000..4b32003
--- /dev/null
+++ b/backends/ppc_symbol.c
@@ -0,0 +1,184 @@
+/* PPC specific symbolic name handling.
+ Copyright (C) 2004, 2005, 2007, 2014, 2015 Red Hat, Inc.
+ This file is part of elfutils.
+ Written by Ulrich Drepper <drepper@redhat.com>, 2004.
+
+ 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 <assert.h>
+#include <elf.h>
+#include <stddef.h>
+#include <string.h>
+
+#define BACKEND ppc_
+#include "libebl_CPU.h"
+
+
+/* Check for the simple reloc types. */
+Elf_Type
+ppc_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type)
+{
+ switch (type)
+ {
+ case R_PPC_ADDR32:
+ case R_PPC_UADDR32:
+ return ELF_T_WORD;
+ case R_PPC_UADDR16:
+ return ELF_T_HALF;
+ default:
+ return ELF_T_NUM;
+ }
+}
+
+
+/* Check whether machine flags are valid. */
+bool
+ppc_machine_flag_check (GElf_Word flags)
+{
+ return ((flags &~ (EF_PPC_EMB
+ | EF_PPC_RELOCATABLE
+ | EF_PPC_RELOCATABLE_LIB)) == 0);
+}
+
+
+const char *
+ppc_dynamic_tag_name (int64_t tag, char *buf __attribute__ ((unused)),
+ size_t len __attribute__ ((unused)))
+{
+ switch (tag)
+ {
+ case DT_PPC_GOT:
+ return "PPC_GOT";
+ case DT_PPC_OPT:
+ return "PPC_OPT";
+ default:
+ break;
+ }
+ return NULL;
+}
+
+
+bool
+ppc_dynamic_tag_check (int64_t tag)
+{
+ return (tag == DT_PPC_GOT
+ || tag == DT_PPC_OPT);
+}
+
+
+/* Look for DT_PPC_GOT. */
+static bool
+find_dyn_got (Elf *elf, GElf_Addr *addr)
+{
+ size_t phnum;
+ if (elf_getphdrnum (elf, &phnum) != 0)
+ return false;
+
+ for (size_t i = 0; i < phnum; ++i)
+ {
+ GElf_Phdr phdr_mem;
+ GElf_Phdr *phdr = gelf_getphdr (elf, i, &phdr_mem);
+ if (phdr == NULL || phdr->p_type != PT_DYNAMIC)
+ continue;
+
+ Elf_Scn *scn = gelf_offscn (elf, phdr->p_offset);
+ GElf_Shdr shdr_mem;
+ GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
+ Elf_Data *data = elf_getdata (scn, NULL);
+ if (shdr != NULL && shdr->sh_type == SHT_DYNAMIC && data != NULL
+ && shdr->sh_entsize != 0)
+ for (unsigned int j = 0; j < shdr->sh_size / shdr->sh_entsize; ++j)
+ {
+ GElf_Dyn dyn_mem;
+ GElf_Dyn *dyn = gelf_getdyn (data, j, &dyn_mem);
+ if (dyn != NULL && dyn->d_tag == DT_PPC_GOT)
+ {
+ *addr = dyn->d_un.d_ptr;
+ return true;
+ }
+ }
+
+ /* There is only one PT_DYNAMIC entry. */
+ break;
+ }
+
+ return false;
+}
+
+
+/* Check whether given symbol's st_value and st_size are OK despite failing
+ normal checks. */
+bool
+ppc_check_special_symbol (Elf *elf, GElf_Ehdr *ehdr, const GElf_Sym *sym,
+ const char *name, const GElf_Shdr *destshdr)
+{
+ if (name == NULL)
+ return false;
+
+ if (strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0)
+ {
+ /* In -msecure-plt mode, DT_PPC_GOT is present and must match. */
+ GElf_Addr gotaddr;
+ if (find_dyn_got (elf, &gotaddr))
+ return sym->st_value == gotaddr;
+
+ /* In -mbss-plt mode, any place in the section is valid. */
+ return true;
+ }
+
+ const char *sname = elf_strptr (elf, ehdr->e_shstrndx, destshdr->sh_name);
+ if (sname == NULL)
+ return false;
+
+ /* Small data area. Normally points to .sdata, in which case we
+ check it is at an offset of 0x8000. It might however fall in the
+ .data section, in which case we cannot check the offset. The
+ size always should be zero. */
+ if (strcmp (name, "_SDA_BASE_") == 0)
+ return (((strcmp (sname, ".sdata") == 0
+ && sym->st_value == destshdr->sh_addr + 0x8000)
+ || strcmp (sname, ".data") == 0)
+ && sym->st_size == 0);
+
+ if (strcmp (name, "_SDA2_BASE_") == 0)
+ return (strcmp (sname, ".sdata2") == 0
+ && sym->st_value == destshdr->sh_addr + 0x8000
+ && sym->st_size == 0);
+
+ return false;
+}
+
+
+/* Check if backend uses a bss PLT in this file. */
+bool
+ppc_bss_plt_p (Elf *elf)
+{
+ GElf_Addr addr;
+ return ! find_dyn_got (elf, &addr);
+}