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}
109