125b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Alpha specific symbolic name handling. 225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Copyright (C) 2002-2011 Red Hat, Inc. 303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes This file is part of elfutils. 425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Written by Ulrich Drepper <drepper@redhat.com>, 2002. 525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes This file is free software; you can redistribute it and/or modify 703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes it under the terms of either 825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes * the GNU Lesser General Public License as published by the Free 1003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes Software Foundation; either version 3 of the License, or (at 1103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes your option) any later version 1203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 1303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes or 1403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 1503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes * the GNU General Public License as published by the Free 1603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes Software Foundation; either version 2 of the License, or (at 1703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes your option) any later version 1803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 1903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes or both in parallel, as here. 2003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 2103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes elfutils is distributed in the hope that it will be useful, but 2225b3c049e70834cf33790a28643ab058b507b35cBen Cheng WITHOUT ANY WARRANTY; without even the implied warranty of 2325b3c049e70834cf33790a28643ab058b507b35cBen Cheng MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 2425b3c049e70834cf33790a28643ab058b507b35cBen Cheng General Public License for more details. 2525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 2603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes You should have received copies of the GNU General Public License and 2703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes the GNU Lesser General Public License along with this program. If 2803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes not, see <http://www.gnu.org/licenses/>. */ 2925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3025b3c049e70834cf33790a28643ab058b507b35cBen Cheng#ifdef HAVE_CONFIG_H 3125b3c049e70834cf33790a28643ab058b507b35cBen Cheng# include <config.h> 3225b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 3325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3425b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <elf.h> 3525b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <stddef.h> 3625b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <string.h> 3725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3825b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define BACKEND alpha_ 3925b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include "libebl_CPU.h" 4025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4225b3c049e70834cf33790a28643ab058b507b35cBen Chengconst char * 4325b3c049e70834cf33790a28643ab058b507b35cBen Chengalpha_dynamic_tag_name (int64_t tag, char *buf __attribute__ ((unused)), 4425b3c049e70834cf33790a28643ab058b507b35cBen Cheng size_t len __attribute__ ((unused))) 4525b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 4625b3c049e70834cf33790a28643ab058b507b35cBen Cheng switch (tag) 4725b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 4825b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DT_ALPHA_PLTRO: 4925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return "ALPHA_PLTRO"; 5025b3c049e70834cf33790a28643ab058b507b35cBen Cheng default: 5125b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 5225b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 5325b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 5425b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 5525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5625b3c049e70834cf33790a28643ab058b507b35cBen Chengbool 5725b3c049e70834cf33790a28643ab058b507b35cBen Chengalpha_dynamic_tag_check (int64_t tag) 5825b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 5925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return tag == DT_ALPHA_PLTRO; 6025b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 6125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 6225b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Check for the simple reloc types. */ 6325b3c049e70834cf33790a28643ab058b507b35cBen ChengElf_Type 6425b3c049e70834cf33790a28643ab058b507b35cBen Chengalpha_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type) 6525b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 6625b3c049e70834cf33790a28643ab058b507b35cBen Cheng switch (type) 6725b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 6825b3c049e70834cf33790a28643ab058b507b35cBen Cheng case R_ALPHA_REFLONG: 6925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return ELF_T_WORD; 7025b3c049e70834cf33790a28643ab058b507b35cBen Cheng case R_ALPHA_REFQUAD: 7125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return ELF_T_XWORD; 7225b3c049e70834cf33790a28643ab058b507b35cBen Cheng default: 7325b3c049e70834cf33790a28643ab058b507b35cBen Cheng return ELF_T_NUM; 7425b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 7525b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 7625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7825b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Check whether SHF_MASKPROC flags are valid. */ 7925b3c049e70834cf33790a28643ab058b507b35cBen Chengbool 8025b3c049e70834cf33790a28643ab058b507b35cBen Chengalpha_machine_section_flag_check (GElf_Xword sh_flags) 8125b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 8225b3c049e70834cf33790a28643ab058b507b35cBen Cheng return (sh_flags &~ (SHF_ALPHA_GPREL)) == 0; 8325b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 8425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8525b3c049e70834cf33790a28643ab058b507b35cBen Chengbool 8625b3c049e70834cf33790a28643ab058b507b35cBen Chengalpha_check_special_section (Ebl *ebl, 8725b3c049e70834cf33790a28643ab058b507b35cBen Cheng int ndx __attribute__ ((unused)), 8825b3c049e70834cf33790a28643ab058b507b35cBen Cheng const GElf_Shdr *shdr, 8925b3c049e70834cf33790a28643ab058b507b35cBen Cheng const char *sname __attribute__ ((unused))) 9025b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 9125b3c049e70834cf33790a28643ab058b507b35cBen Cheng if ((shdr->sh_flags 9225b3c049e70834cf33790a28643ab058b507b35cBen Cheng & (SHF_WRITE | SHF_EXECINSTR)) == (SHF_WRITE | SHF_EXECINSTR) 9325b3c049e70834cf33790a28643ab058b507b35cBen Cheng && shdr->sh_addr != 0) 9425b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 9525b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* This is ordinarily flagged, but is valid for an old-style PLT. 9625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9725b3c049e70834cf33790a28643ab058b507b35cBen Cheng Look for the SHT_DYNAMIC section and the DT_PLTGOT tag in it. 9825b3c049e70834cf33790a28643ab058b507b35cBen Cheng Its d_ptr should match the .plt section's sh_addr. */ 9925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 10025b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf_Scn *scn = NULL; 10125b3c049e70834cf33790a28643ab058b507b35cBen Cheng while ((scn = elf_nextscn (ebl->elf, scn)) != NULL) 10225b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 10325b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Shdr scn_shdr; 10425b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (likely (gelf_getshdr (scn, &scn_shdr) != NULL) 10525b3c049e70834cf33790a28643ab058b507b35cBen Cheng && scn_shdr.sh_type == SHT_DYNAMIC 10625b3c049e70834cf33790a28643ab058b507b35cBen Cheng && scn_shdr.sh_entsize != 0) 10725b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 10825b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Addr pltgot = 0; 10925b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf_Data *data = elf_getdata (scn, NULL); 11025b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (data != NULL) 11125b3c049e70834cf33790a28643ab058b507b35cBen Cheng for (size_t i = 0; i < data->d_size / scn_shdr.sh_entsize; ++i) 11225b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 11325b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Dyn dyn; 11425b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely (gelf_getdyn (data, i, &dyn) == NULL)) 11525b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 11625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (dyn.d_tag == DT_PLTGOT) 11725b3c049e70834cf33790a28643ab058b507b35cBen Cheng pltgot = dyn.d_un.d_ptr; 11825b3c049e70834cf33790a28643ab058b507b35cBen Cheng else if (dyn.d_tag == DT_ALPHA_PLTRO && dyn.d_un.d_val != 0) 11925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return false; /* This PLT should not be writable. */ 12025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 12125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return pltgot == shdr->sh_addr; 12225b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 12325b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 12425b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 12525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 12625b3c049e70834cf33790a28643ab058b507b35cBen Cheng return false; 12725b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 12825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 12925b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Check whether given symbol's st_value and st_size are OK despite failing 13025b3c049e70834cf33790a28643ab058b507b35cBen Cheng normal checks. */ 13125b3c049e70834cf33790a28643ab058b507b35cBen Chengbool 13225b3c049e70834cf33790a28643ab058b507b35cBen Chengalpha_check_special_symbol (Elf *elf __attribute__ ((unused)), 13325b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Ehdr *ehdr __attribute__ ((unused)), 13425b3c049e70834cf33790a28643ab058b507b35cBen Cheng const GElf_Sym *sym __attribute__ ((unused)), 13525b3c049e70834cf33790a28643ab058b507b35cBen Cheng const char *name, 13625b3c049e70834cf33790a28643ab058b507b35cBen Cheng const GElf_Shdr *destshdr __attribute__ ((unused))) 13725b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 13825b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (name == NULL) 13925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return false; 14025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 14125b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0) 14225b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* On Alpha any place in the section is valid. */ 14325b3c049e70834cf33790a28643ab058b507b35cBen Cheng return true; 14425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 14525b3c049e70834cf33790a28643ab058b507b35cBen Cheng return false; 14625b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 14725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 14825b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Check whether only valid bits are set on the st_other symbol flag. 14925b3c049e70834cf33790a28643ab058b507b35cBen Cheng Standard ST_VISIBILITY have already been masked off. */ 15025b3c049e70834cf33790a28643ab058b507b35cBen Chengbool 15125b3c049e70834cf33790a28643ab058b507b35cBen Chengalpha_check_st_other_bits (unsigned char st_other) 15225b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 15325b3c049e70834cf33790a28643ab058b507b35cBen Cheng return ((((st_other & STO_ALPHA_STD_GPLOAD) == STO_ALPHA_NOPV) 15425b3c049e70834cf33790a28643ab058b507b35cBen Cheng || ((st_other & STO_ALPHA_STD_GPLOAD) == STO_ALPHA_STD_GPLOAD)) 15525b3c049e70834cf33790a28643ab058b507b35cBen Cheng && (st_other &~ STO_ALPHA_STD_GPLOAD) == 0); 15625b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 157