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1// SPDX-License-Identifier: GPL-2.0-or-later2 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 12int arch_ftrace_match(char *name)13{14 return !strcmp(name, "_mcount");15}16 17unsigned long arch_dest_reloc_offset(int addend)18{19 return addend;20}21 22bool arch_callee_saved_reg(unsigned char reg)23{24 return false;25}26 27int arch_decode_hint_reg(u8 sp_reg, int *base)28{29 exit(-1);30}31 32const char *arch_nop_insn(int len)33{34 exit(-1);35}36 37const char *arch_ret_insn(int len)38{39 exit(-1);40}41 42int 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 else70 insn->len = 4;71 72 insn->type = typ;73 insn->immediate = imm;74 75 return 0;76}77 78unsigned long arch_jump_destination(struct instruction *insn)79{80 return insn->offset + insn->immediate;81}82 83bool arch_pc_relative_reloc(struct reloc *reloc)84{85 /*86 * The powerpc build only allows certain relocation types, see87 * relocs_check.sh, and none of those accepted are PC relative.88 */89 return false;90}91 92void 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