1 /* RISC-V specific symbolic name handling. 2 This file is part of elfutils. 3 4 This file is free software; you can redistribute it and/or modify 5 it under the terms of either 6 7 * the GNU Lesser General Public License as published by the Free 8 Software Foundation; either version 3 of the License, or (at 9 your option) any later version 10 11 or 12 13 * the GNU General Public License as published by the Free 14 Software Foundation; either version 2 of the License, or (at 15 your option) any later version 16 17 or both in parallel, as here. 18 19 elfutils is distributed in the hope that it will be useful, but 20 WITHOUT ANY WARRANTY; without even the implied warranty of 21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 22 General Public License for more details. 23 24 You should have received copies of the GNU General Public License and 25 the GNU Lesser General Public License along with this program. If 26 not, see <http://www.gnu.org/licenses/>. */ 27 28 #ifdef HAVE_CONFIG_H 29 # include <config.h> 30 #endif 31 32 #include <assert.h> 33 #include <elf.h> 34 #include <stddef.h> 35 #include <string.h> 36 37 #define BACKEND riscv_ 38 #include "libebl_CPU.h" 39 40 41 /* Check for the simple reloc types. */ 42 Elf_Type 43 riscv_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type, 44 int *addsub) 45 { 46 switch (type) 47 { 48 case R_RISCV_SET8: 49 return ELF_T_BYTE; 50 case R_RISCV_SET16: 51 return ELF_T_HALF; 52 case R_RISCV_32: 53 case R_RISCV_SET32: 54 return ELF_T_WORD; 55 case R_RISCV_64: 56 return ELF_T_XWORD; 57 case R_RISCV_ADD16: 58 *addsub = 1; 59 return ELF_T_HALF; 60 case R_RISCV_SUB16: 61 *addsub = -1; 62 return ELF_T_HALF; 63 case R_RISCV_ADD32: 64 *addsub = 1; 65 return ELF_T_WORD; 66 case R_RISCV_SUB32: 67 *addsub = -1; 68 return ELF_T_WORD; 69 case R_RISCV_ADD64: 70 *addsub = 1; 71 return ELF_T_XWORD; 72 case R_RISCV_SUB64: 73 *addsub = -1; 74 return ELF_T_XWORD; 75 default: 76 return ELF_T_NUM; 77 } 78 } 79 80 /* Check whether machine flags are valid. */ 81 bool 82 riscv_machine_flag_check (GElf_Word flags) 83 { 84 return ((flags &~ (EF_RISCV_RVC 85 | EF_RISCV_FLOAT_ABI)) == 0); 86 } 87 88 /* Check whether given symbol's st_value and st_size are OK despite failing 89 normal checks. */ 90 bool 91 riscv_check_special_symbol (Elf *elf, const GElf_Sym *sym, 92 const char *name, const GElf_Shdr *destshdr) 93 { 94 if (name == NULL) 95 return false; 96 97 size_t shstrndx; 98 if (elf_getshdrstrndx (elf, &shstrndx) != 0) 99 return false; 100 const char *sname = elf_strptr (elf, shstrndx, destshdr->sh_name); 101 if (sname == NULL) 102 return false; 103 104 /* _GLOBAL_OFFSET_TABLE_ points to the start of the .got section, but it 105 is preceded by the .got.plt section in the output .got section. */ 106 if (strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0) 107 return (strcmp (sname, ".got") == 0 108 && sym->st_value >= destshdr->sh_addr 109 && sym->st_value < destshdr->sh_addr + destshdr->sh_size); 110 111 /* __global_pointer$ points to the .sdata section with an offset of 112 0x800. It might however fall in the .got section, in which case we 113 cannot check the offset. The size always should be zero. */ 114 if (strcmp (name, "__global_pointer$") == 0) 115 return (((strcmp (sname, ".sdata") == 0 116 && sym->st_value == destshdr->sh_addr + 0x800) 117 || strcmp (sname, ".got") == 0) 118 && sym->st_size == 0); 119 120 return false; 121 } 122
