linux/tools/objtool/arch/powerpc/decode.c

// SPDX-License-Identifier: GPL-2.0-or-later

#include <stdio.h>
#include <stdlib.h>
#include <objtool/check.h>
#include <objtool/elf.h>
#include <objtool/arch.h>
#include <objtool/warn.h>
#include <objtool/builtin.h>
#include <objtool/endianness.h>

unsigned long arch_dest_reloc_offset(int addend)
{
	return addend;
}

bool arch_callee_saved_reg(unsigned char reg)
{
	return false;
}

int arch_decode_hint_reg(u8 sp_reg, int *base)
{
	exit(-1);
}

const char *arch_nop_insn(int len)
{
	exit(-1);
}

const char *arch_ret_insn(int len)
{
	exit(-1);
}

int arch_decode_instruction(struct objtool_file *file, const struct section *sec,
			    unsigned long offset, unsigned int maxlen,
			    unsigned int *len, enum insn_type *type,
			    unsigned long *immediate,
			    struct list_head *ops_list)
{
	unsigned int opcode;
	enum insn_type typ;
	unsigned long imm;
	u32 insn;

	insn = bswap_if_needed(file->elf, *(u32 *)(sec->data->d_buf + offset));
	opcode = insn >> 26;
	typ = INSN_OTHER;
	imm = 0;

	if (opcode == 1)
		*len = 8;
	else
		*len = 4;

	*type = typ;
	*immediate = imm;

	return 0;
}

unsigned long arch_jump_destination(struct instruction *insn)
{
	return insn->offset + insn->immediate;
}

void arch_initial_func_cfi_state(struct cfi_init_state *state)
{
	int i;

	for (i = 0; i < CFI_NUM_REGS; i++) {
		state->regs[i].base = CFI_UNDEFINED;
		state->regs[i].offset = 0;
	}

	/* initial CFA (call frame address) */
	state->cfa.base = CFI_SP;
	state->cfa.offset = 0;

	/* initial LR (return address) */
	state->regs[CFI_RA].base = CFI_CFA;
	state->regs[CFI_RA].offset = 0;
}