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 struct instruction *insn) 45 { 46 unsigned int opcode; 47 enum insn_type typ; 48 unsigned long imm; 49 u32 ins; 50 51 ins = bswap_if_needed(file->elf, *(u32 *)(sec->data->d_buf + offset)); 52 opcode = ins >> 26; 53 typ = INSN_OTHER; 54 imm = 0; 55 56 switch (opcode) { 57 case 18: /* b[l][a] */ 58 if ((ins & 3) == 1) /* bl */ 59 typ = INSN_CALL; 60 61 imm = ins & 0x3fffffc; 62 if (imm & 0x2000000) 63 imm -= 0x4000000; 64 break; 65 } 66 67 if (opcode == 1) 68 insn->len = 8; 69 else 70 insn->len = 4; 71 72 insn->type = typ; 73 insn->immediate = imm; 74 75 return 0; 76 } 77 78 unsigned long arch_jump_destination(struct instruction *insn) 79 { 80 return insn->offset + insn->immediate; 81 } 82 83 bool arch_pc_relative_reloc(struct reloc *reloc) 84 { 85 /* 86 * The powerpc build only allows certain relocation types, see 87 * relocs_check.sh, and none of those accepted are PC relative. 88 */ 89 return false; 90 } 91 92 void arch_initial_func_cfi_state(struct cfi_init_state *state) 93 { 94 int i; 95 96 for (i = 0; i < CFI_NUM_REGS; i++) { 97 state->regs[i].base = CFI_UNDEFINED; 98 state->regs[i].offset = 0; 99 } 100 101 /* initial CFA (call frame address) */ 102 state->cfa.base = CFI_SP; 103 state->cfa.offset = 0; 104 105 /* initial LR (return address) */ 106 state->regs[CFI_RA].base = CFI_CFA; 107 state->regs[CFI_RA].offset = 0; 108 } 109