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,struct disasm_line * dl __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 struct disasm_line *dl __maybe_unused)
16 {
17 char *s = strchr(ops->raw, ','), *target, *endptr;
18
19 if (s == NULL)
20 return -1;
21
22 *s = '\0';
23 ops->source.raw = strdup(ops->raw);
24 *s = ',';
25
26 if (ops->source.raw == NULL)
27 return -1;
28
29 target = ++s;
30 ops->target.raw = strdup(target);
31 if (ops->target.raw == NULL)
32 goto out_free_source;
33
34 ops->target.addr = strtoull(target, &endptr, 16);
35 if (endptr == target)
36 goto out_free_target;
37
38 s = strchr(endptr, '<');
39 if (s == NULL)
40 goto out_free_target;
41 endptr = strchr(s + 1, '>');
42 if (endptr == NULL)
43 goto out_free_target;
44
45 *endptr = '\0';
46 *s = ' ';
47 ops->target.name = strdup(s);
48 *s = '<';
49 *endptr = '>';
50 if (ops->target.name == NULL)
51 goto out_free_target;
52
53 return 0;
54
55 out_free_target:
56 zfree(&ops->target.raw);
57 out_free_source:
58 zfree(&ops->source.raw);
59 return -1;
60 }
61
62 static int mov__scnprintf(struct ins *ins, char *bf, size_t size,
63 struct ins_operands *ops, int max_ins_name);
64
65 static struct ins_ops arm64_mov_ops = {
66 .parse = arm64_mov__parse,
67 .scnprintf = mov__scnprintf,
68 };
69
arm64__associate_instruction_ops(struct arch * arch,const char * name)70 static struct ins_ops *arm64__associate_instruction_ops(struct arch *arch, const char *name)
71 {
72 struct arm64_annotate *arm = arch->priv;
73 struct ins_ops *ops;
74 regmatch_t match[2];
75
76 if (!regexec(&arm->jump_insn, name, 2, match, 0))
77 ops = &jump_ops;
78 else if (!regexec(&arm->call_insn, name, 2, match, 0))
79 ops = &call_ops;
80 else if (!strcmp(name, "ret"))
81 ops = &ret_ops;
82 else
83 ops = &arm64_mov_ops;
84
85 arch__associate_ins_ops(arch, name, ops);
86 return ops;
87 }
88
arm64__annotate_init(struct arch * arch,char * cpuid __maybe_unused)89 static int arm64__annotate_init(struct arch *arch, char *cpuid __maybe_unused)
90 {
91 struct arm64_annotate *arm;
92 int err;
93
94 if (arch->initialized)
95 return 0;
96
97 arm = zalloc(sizeof(*arm));
98 if (!arm)
99 return ENOMEM;
100
101 /* bl, blr */
102 err = regcomp(&arm->call_insn, "^blr?$", REG_EXTENDED);
103 if (err)
104 goto out_free_arm;
105 /* b, b.cond, br, cbz/cbnz, tbz/tbnz */
106 err = regcomp(&arm->jump_insn, "^[ct]?br?\\.?(cc|cs|eq|ge|gt|hi|hs|le|lo|ls|lt|mi|ne|pl|vc|vs)?n?z?$",
107 REG_EXTENDED);
108 if (err)
109 goto out_free_call;
110
111 arch->initialized = true;
112 arch->priv = arm;
113 arch->associate_instruction_ops = arm64__associate_instruction_ops;
114 arch->objdump.comment_char = '/';
115 arch->objdump.skip_functions_char = '+';
116 return 0;
117
118 out_free_call:
119 regfree(&arm->call_insn);
120 out_free_arm:
121 free(arm);
122 return SYMBOL_ANNOTATE_ERRNO__ARCH_INIT_REGEXP;
123 }
124