125b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Alpha specific symbolic name handling. 225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Copyright (C) 2002-2011 Red Hat, Inc. 325b3c049e70834cf33790a28643ab058b507b35cBen Cheng This file is part of Red Hat elfutils. 425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Written by Ulrich Drepper <drepper@redhat.com>, 2002. 525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 625b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is free software; you can redistribute it and/or modify 725b3c049e70834cf33790a28643ab058b507b35cBen Cheng it under the terms of the GNU General Public License as published by the 825b3c049e70834cf33790a28643ab058b507b35cBen Cheng Free Software Foundation; version 2 of the License. 925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 1025b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is distributed in the hope that it will be useful, but 1125b3c049e70834cf33790a28643ab058b507b35cBen Cheng WITHOUT ANY WARRANTY; without even the implied warranty of 1225b3c049e70834cf33790a28643ab058b507b35cBen Cheng MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 1325b3c049e70834cf33790a28643ab058b507b35cBen Cheng General Public License for more details. 1425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 1525b3c049e70834cf33790a28643ab058b507b35cBen Cheng You should have received a copy of the GNU General Public License along 1625b3c049e70834cf33790a28643ab058b507b35cBen Cheng with Red Hat elfutils; if not, write to the Free Software Foundation, 1725b3c049e70834cf33790a28643ab058b507b35cBen Cheng Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 1825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 1925b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is an included package of the Open Invention Network. 2025b3c049e70834cf33790a28643ab058b507b35cBen Cheng An included package of the Open Invention Network is a package for which 2125b3c049e70834cf33790a28643ab058b507b35cBen Cheng Open Invention Network licensees cross-license their patents. No patent 2225b3c049e70834cf33790a28643ab058b507b35cBen Cheng license is granted, either expressly or impliedly, by designation as an 2325b3c049e70834cf33790a28643ab058b507b35cBen Cheng included package. Should you wish to participate in the Open Invention 2425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Network licensing program, please visit www.openinventionnetwork.com 2525b3c049e70834cf33790a28643ab058b507b35cBen Cheng <http://www.openinventionnetwork.com>. */ 2625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 2725b3c049e70834cf33790a28643ab058b507b35cBen Cheng#ifdef HAVE_CONFIG_H 2825b3c049e70834cf33790a28643ab058b507b35cBen Cheng# include <config.h> 2925b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 3025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3125b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <elf.h> 3225b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <stddef.h> 3325b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <string.h> 3425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3525b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define BACKEND alpha_ 3625b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include "libebl_CPU.h" 3725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3925b3c049e70834cf33790a28643ab058b507b35cBen Chengconst char * 4025b3c049e70834cf33790a28643ab058b507b35cBen Chengalpha_dynamic_tag_name (int64_t tag, char *buf __attribute__ ((unused)), 4125b3c049e70834cf33790a28643ab058b507b35cBen Cheng size_t len __attribute__ ((unused))) 4225b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 4325b3c049e70834cf33790a28643ab058b507b35cBen Cheng switch (tag) 4425b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 4525b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DT_ALPHA_PLTRO: 4625b3c049e70834cf33790a28643ab058b507b35cBen Cheng return "ALPHA_PLTRO"; 4725b3c049e70834cf33790a28643ab058b507b35cBen Cheng default: 4825b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 4925b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 5025b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 5125b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 5225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5325b3c049e70834cf33790a28643ab058b507b35cBen Chengbool 5425b3c049e70834cf33790a28643ab058b507b35cBen Chengalpha_dynamic_tag_check (int64_t tag) 5525b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 5625b3c049e70834cf33790a28643ab058b507b35cBen Cheng return tag == DT_ALPHA_PLTRO; 5725b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 5825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5925b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Check for the simple reloc types. */ 6025b3c049e70834cf33790a28643ab058b507b35cBen ChengElf_Type 6125b3c049e70834cf33790a28643ab058b507b35cBen Chengalpha_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type) 6225b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 6325b3c049e70834cf33790a28643ab058b507b35cBen Cheng switch (type) 6425b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 6525b3c049e70834cf33790a28643ab058b507b35cBen Cheng case R_ALPHA_REFLONG: 6625b3c049e70834cf33790a28643ab058b507b35cBen Cheng return ELF_T_WORD; 6725b3c049e70834cf33790a28643ab058b507b35cBen Cheng case R_ALPHA_REFQUAD: 6825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return ELF_T_XWORD; 6925b3c049e70834cf33790a28643ab058b507b35cBen Cheng default: 7025b3c049e70834cf33790a28643ab058b507b35cBen Cheng return ELF_T_NUM; 7125b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 7225b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 7325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7525b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Check whether SHF_MASKPROC flags are valid. */ 7625b3c049e70834cf33790a28643ab058b507b35cBen Chengbool 7725b3c049e70834cf33790a28643ab058b507b35cBen Chengalpha_machine_section_flag_check (GElf_Xword sh_flags) 7825b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 7925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return (sh_flags &~ (SHF_ALPHA_GPREL)) == 0; 8025b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 8125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8225b3c049e70834cf33790a28643ab058b507b35cBen Chengbool 8325b3c049e70834cf33790a28643ab058b507b35cBen Chengalpha_check_special_section (Ebl *ebl, 8425b3c049e70834cf33790a28643ab058b507b35cBen Cheng int ndx __attribute__ ((unused)), 8525b3c049e70834cf33790a28643ab058b507b35cBen Cheng const GElf_Shdr *shdr, 8625b3c049e70834cf33790a28643ab058b507b35cBen Cheng const char *sname __attribute__ ((unused))) 8725b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 8825b3c049e70834cf33790a28643ab058b507b35cBen Cheng if ((shdr->sh_flags 8925b3c049e70834cf33790a28643ab058b507b35cBen Cheng & (SHF_WRITE | SHF_EXECINSTR)) == (SHF_WRITE | SHF_EXECINSTR) 9025b3c049e70834cf33790a28643ab058b507b35cBen Cheng && shdr->sh_addr != 0) 9125b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 9225b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* This is ordinarily flagged, but is valid for an old-style PLT. 9325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Look for the SHT_DYNAMIC section and the DT_PLTGOT tag in it. 9525b3c049e70834cf33790a28643ab058b507b35cBen Cheng Its d_ptr should match the .plt section's sh_addr. */ 9625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9725b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf_Scn *scn = NULL; 9825b3c049e70834cf33790a28643ab058b507b35cBen Cheng while ((scn = elf_nextscn (ebl->elf, scn)) != NULL) 9925b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 10025b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Shdr scn_shdr; 10125b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (likely (gelf_getshdr (scn, &scn_shdr) != NULL) 10225b3c049e70834cf33790a28643ab058b507b35cBen Cheng && scn_shdr.sh_type == SHT_DYNAMIC 10325b3c049e70834cf33790a28643ab058b507b35cBen Cheng && scn_shdr.sh_entsize != 0) 10425b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 10525b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Addr pltgot = 0; 10625b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf_Data *data = elf_getdata (scn, NULL); 10725b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (data != NULL) 10825b3c049e70834cf33790a28643ab058b507b35cBen Cheng for (size_t i = 0; i < data->d_size / scn_shdr.sh_entsize; ++i) 10925b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 11025b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Dyn dyn; 11125b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely (gelf_getdyn (data, i, &dyn) == NULL)) 11225b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 11325b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (dyn.d_tag == DT_PLTGOT) 11425b3c049e70834cf33790a28643ab058b507b35cBen Cheng pltgot = dyn.d_un.d_ptr; 11525b3c049e70834cf33790a28643ab058b507b35cBen Cheng else if (dyn.d_tag == DT_ALPHA_PLTRO && dyn.d_un.d_val != 0) 11625b3c049e70834cf33790a28643ab058b507b35cBen Cheng return false; /* This PLT should not be writable. */ 11725b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 11825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return pltgot == shdr->sh_addr; 11925b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 12025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 12125b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 12225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 12325b3c049e70834cf33790a28643ab058b507b35cBen Cheng return false; 12425b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 12525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 12625b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Check whether given symbol's st_value and st_size are OK despite failing 12725b3c049e70834cf33790a28643ab058b507b35cBen Cheng normal checks. */ 12825b3c049e70834cf33790a28643ab058b507b35cBen Chengbool 12925b3c049e70834cf33790a28643ab058b507b35cBen Chengalpha_check_special_symbol (Elf *elf __attribute__ ((unused)), 13025b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Ehdr *ehdr __attribute__ ((unused)), 13125b3c049e70834cf33790a28643ab058b507b35cBen Cheng const GElf_Sym *sym __attribute__ ((unused)), 13225b3c049e70834cf33790a28643ab058b507b35cBen Cheng const char *name, 13325b3c049e70834cf33790a28643ab058b507b35cBen Cheng const GElf_Shdr *destshdr __attribute__ ((unused))) 13425b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 13525b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (name == NULL) 13625b3c049e70834cf33790a28643ab058b507b35cBen Cheng return false; 13725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 13825b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0) 13925b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* On Alpha any place in the section is valid. */ 14025b3c049e70834cf33790a28643ab058b507b35cBen Cheng return true; 14125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 14225b3c049e70834cf33790a28643ab058b507b35cBen Cheng return false; 14325b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 14425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 14525b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Check whether only valid bits are set on the st_other symbol flag. 14625b3c049e70834cf33790a28643ab058b507b35cBen Cheng Standard ST_VISIBILITY have already been masked off. */ 14725b3c049e70834cf33790a28643ab058b507b35cBen Chengbool 14825b3c049e70834cf33790a28643ab058b507b35cBen Chengalpha_check_st_other_bits (unsigned char st_other) 14925b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 15025b3c049e70834cf33790a28643ab058b507b35cBen Cheng return ((((st_other & STO_ALPHA_STD_GPLOAD) == STO_ALPHA_NOPV) 15125b3c049e70834cf33790a28643ab058b507b35cBen Cheng || ((st_other & STO_ALPHA_STD_GPLOAD) == STO_ALPHA_STD_GPLOAD)) 15225b3c049e70834cf33790a28643ab058b507b35cBen Cheng && (st_other &~ STO_ALPHA_STD_GPLOAD) == 0); 15325b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 154