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;
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 struct instruction {
40 struct list_head list;
41 struct hlist_node hash;
42 struct list_head call_node;
43 struct section *sec;
44 unsigned long offset;
45 unsigned int len;
46 enum insn_type type;
47 unsigned long immediate;
48
49 u16 dead_end : 1,
50 ignore : 1,
51 ignore_alts : 1,
52 hint : 1,
53 save : 1,
54 restore : 1,
55 retpoline_safe : 1,
56 noendbr : 1,
57 entry : 1;
58 /* 7 bit hole */
59
60 s8 instr;
61 u8 visited;
62
63 struct alt_group *alt_group;
64 struct symbol *call_dest;
65 struct instruction *jump_dest;
66 struct instruction *first_jump_src;
67 struct reloc *jump_table;
68 struct reloc *reloc;
69 struct list_head alts;
70 struct symbol *func;
71 struct list_head stack_ops;
72 struct cfi_state *cfi;
73 };
74
75 #define VISITED_BRANCH 0x01
76 #define VISITED_BRANCH_UACCESS 0x02
77 #define VISITED_BRANCH_MASK 0x03
78 #define VISITED_ENTRY 0x04
79
is_static_jump(struct instruction * insn)80 static inline bool is_static_jump(struct instruction *insn)
81 {
82 return insn->type == INSN_JUMP_CONDITIONAL ||
83 insn->type == INSN_JUMP_UNCONDITIONAL;
84 }
85
is_dynamic_jump(struct instruction * insn)86 static inline bool is_dynamic_jump(struct instruction *insn)
87 {
88 return insn->type == INSN_JUMP_DYNAMIC ||
89 insn->type == INSN_JUMP_DYNAMIC_CONDITIONAL;
90 }
91
is_jump(struct instruction * insn)92 static inline bool is_jump(struct instruction *insn)
93 {
94 return is_static_jump(insn) || is_dynamic_jump(insn);
95 }
96
97 struct instruction *find_insn(struct objtool_file *file,
98 struct section *sec, unsigned long offset);
99
100 #define for_each_insn(file, insn) \
101 list_for_each_entry(insn, &file->insn_list, list)
102
103 #define sec_for_each_insn(file, sec, insn) \
104 for (insn = find_insn(file, sec, 0); \
105 insn && &insn->list != &file->insn_list && \
106 insn->sec == sec; \
107 insn = list_next_entry(insn, list))
108
109 #endif /* _CHECK_H */
110