1 // SPDX-License-Identifier: GPL-2.0-or-later 2 3 #include <stdio.h> 4 #include <stdlib.h> 5 #include <objtool/check.h> 6 #include <objtool/elf.h> 7 #include <objtool/arch.h> 8 #include <objtool/warn.h> 9 #include <objtool/builtin.h> 10 #include <objtool/endianness.h> 11 12 int arch_ftrace_match(char *name) 13 { 14 return !strcmp(name, "_mcount"); 15 } 16 17 unsigned long arch_dest_reloc_offset(int addend) 18 { 19 return addend; 20 } 21 22 bool arch_callee_saved_reg(unsigned char reg) 23 { 24 return false; 25 } 26 27 int arch_decode_hint_reg(u8 sp_reg, int *base) 28 { 29 exit(-1); 30 } 31 32 const char *arch_nop_insn(int len) 33 { 34 exit(-1); 35 } 36 37 const char *arch_ret_insn(int len) 38 { 39 exit(-1); 40 } 41 42 int arch_decode_instruction(struct objtool_file *file, const struct section *sec, 43 unsigned long offset, unsigned int maxlen, 44 unsigned int *len, enum insn_type *type, 45 unsigned long *immediate, 46 struct list_head *ops_list) 47 { 48 unsigned int opcode; 49 enum insn_type typ; 50 unsigned long imm; 51 u32 insn; 52 53 insn = bswap_if_needed(file->elf, *(u32 *)(sec->data->d_buf + offset)); 54 opcode = insn >> 26; 55 typ = INSN_OTHER; 56 imm = 0; 57 58 switch (opcode) { 59 case 18: /* b[l][a] */ 60 if ((insn & 3) == 1) /* bl */ 61 typ = INSN_CALL; 62 63 imm = insn & 0x3fffffc; 64 if (imm & 0x2000000) 65 imm -= 0x4000000; 66 break; 67 } 68 69 if (opcode == 1) 70 *len = 8; 71 else 72 *len = 4; 73 74 *type = typ; 75 *immediate = imm; 76 77 return 0; 78 } 79 80 unsigned long arch_jump_destination(struct instruction *insn) 81 { 82 return insn->offset + insn->immediate; 83 } 84 85 bool arch_pc_relative_reloc(struct reloc *reloc) 86 { 87 /* 88 * The powerpc build only allows certain relocation types, see 89 * relocs_check.sh, and none of those accepted are PC relative. 90 */ 91 return false; 92 } 93 94 void arch_initial_func_cfi_state(struct cfi_init_state *state) 95 { 96 int i; 97 98 for (i = 0; i < CFI_NUM_REGS; i++) { 99 state->regs[i].base = CFI_UNDEFINED; 100 state->regs[i].offset = 0; 101 } 102 103 /* initial CFA (call frame address) */ 104 state->cfa.base = CFI_SP; 105 state->cfa.offset = 0; 106 107 /* initial LR (return address) */ 108 state->regs[CFI_RA].base = CFI_CFA; 109 state->regs[CFI_RA].offset = 0; 110 } 111