1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
4 */
5
6 #ifndef _CHECK_H
7 #define _CHECK_H
8
9 #include <stdbool.h>
10 #include <objtool/cfi.h>
11 #include <objtool/arch.h>
12
13 struct insn_state {
14 struct cfi_state cfi;
15 unsigned int uaccess_stack;
16 bool uaccess;
17 bool df;
18 bool noinstr;
19 s8 instr;
20 };
21
22 struct alt_group {
23 /*
24 * Pointer from a replacement group to the original group. NULL if it
25 * *is* the original group.
26 */
27 struct alt_group *orig_group;
28
29 /* First and last instructions in the group */
30 struct instruction *first_insn, *last_insn, *nop;
31
32 /*
33 * Byte-offset-addressed len-sized array of pointers to CFI structs.
34 * This is shared with the other alt_groups in the same alternative.
35 */
36 struct cfi_state **cfi;
37 };
38
39 #define INSN_CHUNK_BITS 8
40 #define INSN_CHUNK_SIZE (1 << INSN_CHUNK_BITS)
41 #define INSN_CHUNK_MAX (INSN_CHUNK_SIZE - 1)
42
43 struct instruction {
44 struct hlist_node hash;
45 struct list_head call_node;
46 struct section *sec;
47 unsigned long offset;
48 unsigned long immediate;
49
50 u8 len;
51 u8 prev_len;
52 u8 type;
53 s8 instr;
54
55 u32 idx : INSN_CHUNK_BITS,
56 dead_end : 1,
57 ignore : 1,
58 ignore_alts : 1,
59 hint : 1,
60 save : 1,
61 restore : 1,
62 retpoline_safe : 1,
63 noendbr : 1,
64 unret : 1,
65 visited : 4,
66 no_reloc : 1;
67 /* 10 bit hole */
68
69 struct alt_group *alt_group;
70 struct instruction *jump_dest;
71 struct instruction *first_jump_src;
72 union {
73 struct symbol *_call_dest;
74 struct reloc *_jump_table;
75 };
76 struct alternative *alts;
77 struct symbol *sym;
78 struct stack_op *stack_ops;
79 struct cfi_state *cfi;
80 };
81
insn_func(struct instruction * insn)82 static inline struct symbol *insn_func(struct instruction *insn)
83 {
84 struct symbol *sym = insn->sym;
85
86 if (sym && sym->type != STT_FUNC)
87 sym = NULL;
88
89 return sym;
90 }
91
92 #define VISITED_BRANCH 0x01
93 #define VISITED_BRANCH_UACCESS 0x02
94 #define VISITED_BRANCH_MASK 0x03
95 #define VISITED_UNRET 0x04
96
is_static_jump(struct instruction * insn)97 static inline bool is_static_jump(struct instruction *insn)
98 {
99 return insn->type == INSN_JUMP_CONDITIONAL ||
100 insn->type == INSN_JUMP_UNCONDITIONAL;
101 }
102
is_dynamic_jump(struct instruction * insn)103 static inline bool is_dynamic_jump(struct instruction *insn)
104 {
105 return insn->type == INSN_JUMP_DYNAMIC ||
106 insn->type == INSN_JUMP_DYNAMIC_CONDITIONAL;
107 }
108
is_jump(struct instruction * insn)109 static inline bool is_jump(struct instruction *insn)
110 {
111 return is_static_jump(insn) || is_dynamic_jump(insn);
112 }
113
114 struct instruction *find_insn(struct objtool_file *file,
115 struct section *sec, unsigned long offset);
116
117 struct instruction *next_insn_same_sec(struct objtool_file *file, struct instruction *insn);
118
119 #define sec_for_each_insn(file, _sec, insn) \
120 for (insn = find_insn(file, _sec, 0); \
121 insn && insn->sec == _sec; \
122 insn = next_insn_same_sec(file, insn))
123
124 #endif /* _CHECK_H */
125
