1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/compiler.h>
3 #include <sys/types.h>
4 #include <regex.h>
5 #include <stdlib.h>
6
7 struct arm64_annotate {
8 regex_t call_insn,
9 jump_insn;
10 };
11
arm64_mov__parse(struct arch * arch __maybe_unused,struct ins_operands * ops,struct map_symbol * ms __maybe_unused)12 static int arm64_mov__parse(struct arch *arch __maybe_unused,
13 struct ins_operands *ops,
14 struct map_symbol *ms __maybe_unused)
15 {
16 char *s = strchr(ops->raw, ','), *target, *endptr;
17
18 if (s == NULL)
19 return -1;
20
21 *s = '\0';
22 ops->source.raw = strdup(ops->raw);
23 *s = ',';
24
25 if (ops->source.raw == NULL)
26 return -1;
27
28 target = ++s;
29 ops->target.raw = strdup(target);
30 if (ops->target.raw == NULL)
31 goto out_free_source;
32
33 ops->target.addr = strtoull(target, &endptr, 16);
34 if (endptr == target)
35 goto out_free_target;
36
37 s = strchr(endptr, '<');
38 if (s == NULL)
39 goto out_free_target;
40 endptr = strchr(s + 1, '>');
41 if (endptr == NULL)
42 goto out_free_target;
43
44 *endptr = '\0';
45 *s = ' ';
46 ops->target.name = strdup(s);
47 *s = '<';
48 *endptr = '>';
49 if (ops->target.name == NULL)
50 goto out_free_target;
51
52 return 0;
53
54 out_free_target:
55 zfree(&ops->target.raw);
56 out_free_source:
57 zfree(&ops->source.raw);
58 return -1;
59 }
60
61 static int mov__scnprintf(struct ins *ins, char *bf, size_t size,
62 struct ins_operands *ops, int max_ins_name);
63
64 static struct ins_ops arm64_mov_ops = {
65 .parse = arm64_mov__parse,
66 .scnprintf = mov__scnprintf,
67 };
68
arm64__associate_instruction_ops(struct arch * arch,const char * name)69 static struct ins_ops *arm64__associate_instruction_ops(struct arch *arch, const char *name)
70 {
71 struct arm64_annotate *arm = arch->priv;
72 struct ins_ops *ops;
73 regmatch_t match[2];
74
75 if (!regexec(&arm->jump_insn, name, 2, match, 0))
76 ops = &jump_ops;
77 else if (!regexec(&arm->call_insn, name, 2, match, 0))
78 ops = &call_ops;
79 else if (!strcmp(name, "ret"))
80 ops = &ret_ops;
81 else
82 ops = &arm64_mov_ops;
83
84 arch__associate_ins_ops(arch, name, ops);
85 return ops;
86 }
87
arm64__annotate_init(struct arch * arch,char * cpuid __maybe_unused)88 static int arm64__annotate_init(struct arch *arch, char *cpuid __maybe_unused)
89 {
90 struct arm64_annotate *arm;
91 int err;
92
93 if (arch->initialized)
94 return 0;
95
96 arm = zalloc(sizeof(*arm));
97 if (!arm)
98 return ENOMEM;
99
100 /* bl, blr */
101 err = regcomp(&arm->call_insn, "^blr?$", REG_EXTENDED);
102 if (err)
103 goto out_free_arm;
104 /* b, b.cond, br, cbz/cbnz, tbz/tbnz */
105 err = regcomp(&arm->jump_insn, "^[ct]?br?\\.?(cc|cs|eq|ge|gt|hi|le|ls|lt|mi|ne|pl)?n?z?$",
106 REG_EXTENDED);
107 if (err)
108 goto out_free_call;
109
110 arch->initialized = true;
111 arch->priv = arm;
112 arch->associate_instruction_ops = arm64__associate_instruction_ops;
113 arch->objdump.comment_char = '/';
114 arch->objdump.skip_functions_char = '+';
115 return 0;
116
117 out_free_call:
118 regfree(&arm->call_insn);
119 out_free_arm:
120 free(arm);
121 return SYMBOL_ANNOTATE_ERRNO__ARCH_INIT_REGEXP;
122 }
123