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?$", REG_EXTENDED);
102 	if (err)
103 		goto out_free_arm;
104 	/* b, b.cond, br, cbz/cbnz, tbz/tbnz */
105 	err = regcomp(&arm->jump_insn, "^[ct]?br?\\.?(cc|cs|eq|ge|gt|hi|hs|le|lo|ls|lt|mi|ne|pl|vc|vs)?n?z?$",
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