objtool: Support stack layout changes in alternatives
[linux-2.6-microblaze.git] / tools / objtool / include / objtool / check.h
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 static_call_node;
43         struct section *sec;
44         unsigned long offset;
45         unsigned int len;
46         enum insn_type type;
47         unsigned long immediate;
48         bool dead_end, ignore, ignore_alts;
49         bool hint;
50         bool retpoline_safe;
51         s8 instr;
52         u8 visited;
53         u8 ret_offset;
54         struct alt_group *alt_group;
55         struct symbol *call_dest;
56         struct instruction *jump_dest;
57         struct instruction *first_jump_src;
58         struct reloc *jump_table;
59         struct list_head alts;
60         struct symbol *func;
61         struct list_head stack_ops;
62         struct cfi_state cfi;
63 };
64
65 static inline bool is_static_jump(struct instruction *insn)
66 {
67         return insn->type == INSN_JUMP_CONDITIONAL ||
68                insn->type == INSN_JUMP_UNCONDITIONAL;
69 }
70
71 struct instruction *find_insn(struct objtool_file *file,
72                               struct section *sec, unsigned long offset);
73
74 #define for_each_insn(file, insn)                                       \
75         list_for_each_entry(insn, &file->insn_list, list)
76
77 #define sec_for_each_insn(file, sec, insn)                              \
78         for (insn = find_insn(file, sec, 0);                            \
79              insn && &insn->list != &file->insn_list &&                 \
80                         insn->sec == sec;                               \
81              insn = list_next_entry(insn, list))
82
83 #endif /* _CHECK_H */