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 | |