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
 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	else
 70		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, see
 87	 * 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}