1 /* PPC64 specific symbolic name handling. 2 Copyright (C) 2004, 2005, 2014 Red Hat, Inc. 3 This file is part of elfutils. 4 Written by Ulrich Drepper <drepper (at) redhat.com>, 2004. 5 6 This file is free software; you can redistribute it and/or modify 7 it under the terms of either 8 9 * the GNU Lesser General Public License as published by the Free 10 Software Foundation; either version 3 of the License, or (at 11 your option) any later version 12 13 or 14 15 * the GNU General Public License as published by the Free 16 Software Foundation; either version 2 of the License, or (at 17 your option) any later version 18 19 or both in parallel, as here. 20 21 elfutils is distributed in the hope that it will be useful, but 22 WITHOUT ANY WARRANTY; without even the implied warranty of 23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 24 General Public License for more details. 25 26 You should have received copies of the GNU General Public License and 27 the GNU Lesser General Public License along with this program. If 28 not, see <http://www.gnu.org/licenses/>. */ 29 30 #ifdef HAVE_CONFIG_H 31 # include <config.h> 32 #endif 33 34 #include <assert.h> 35 #include <elf.h> 36 #include <stddef.h> 37 #include <string.h> 38 39 #define BACKEND ppc64_ 40 #include "libebl_CPU.h" 41 42 43 /* Check for the simple reloc types. */ 44 Elf_Type 45 ppc64_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type, 46 int *addsub __attribute__ ((unused))) 47 { 48 switch (type) 49 { 50 case R_PPC64_ADDR64: 51 case R_PPC64_UADDR64: 52 return ELF_T_XWORD; 53 case R_PPC64_ADDR32: 54 case R_PPC64_UADDR32: 55 return ELF_T_WORD; 56 case R_PPC64_UADDR16: 57 return ELF_T_HALF; 58 default: 59 return ELF_T_NUM; 60 } 61 } 62 63 64 const char * 65 ppc64_dynamic_tag_name (int64_t tag, char *buf __attribute__ ((unused)), 66 size_t len __attribute__ ((unused))) 67 { 68 switch (tag) 69 { 70 case DT_PPC64_GLINK: 71 return "PPC64_GLINK"; 72 case DT_PPC64_OPD: 73 return "PPC64_OPD"; 74 case DT_PPC64_OPDSZ: 75 return "PPC64_OPDSZ"; 76 case DT_PPC64_OPT: 77 return "PPC64_OPT"; 78 default: 79 break; 80 } 81 return NULL; 82 } 83 84 85 bool 86 ppc64_dynamic_tag_check (int64_t tag) 87 { 88 return (tag == DT_PPC64_GLINK 89 || tag == DT_PPC64_OPD 90 || tag == DT_PPC64_OPDSZ 91 || tag == DT_PPC64_OPT); 92 } 93 94 95 /* Check whether given symbol's st_value and st_size are OK despite failing 96 normal checks. */ 97 bool 98 ppc64_check_special_symbol (Elf *elf, 99 const GElf_Sym *sym __attribute__ ((unused)), 100 const char *name __attribute__ ((unused)), 101 const GElf_Shdr *destshdr) 102 { 103 size_t shstrndx; 104 if (elf_getshdrstrndx (elf, &shstrndx) != 0) 105 return false; 106 const char *sname = elf_strptr (elf, shstrndx, destshdr->sh_name); 107 if (sname == NULL) 108 return false; 109 return strcmp (sname, ".opd") == 0; 110 } 111 112 113 /* Check if backend uses a bss PLT in this file. */ 114 bool 115 ppc64_bss_plt_p (Elf *elf __attribute__ ((unused))) 116 { 117 return true; 118 } 119 120 /* Check whether machine flags are valid. PPC64 has three possible values: 121 0 - for unspecified ABI, or not using any specific ABI features. 122 1 - for the original ELF PPC64 ABI using function descriptors. 123 2 - for the revised ELFv2 PPC64 ABI without function descriptors. */ 124 bool 125 ppc64_machine_flag_check (GElf_Word flags) 126 { 127 return flags == 0 || flags == 1 || flags == 2; 128 } 129 130 bool 131 ppc64_check_st_other_bits (unsigned char st_other) 132 { 133 return (PPC64_LOCAL_ENTRY_OFFSET (st_other) != 0); 134 } 135
