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
7struct arm64_annotate {
8	regex_t call_insn,
9		jump_insn;
10};
11
12static 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
54out_free_target:
55	zfree(&ops->target.raw);
56out_free_source:
57	zfree(&ops->source.raw);
58	return -1;
59}
60
61static int mov__scnprintf(struct ins *ins, char *bf, size_t size,
62			  struct ins_operands *ops, int max_ins_name);
63
64static struct ins_ops arm64_mov_ops = {
65	.parse	   = arm64_mov__parse,
66	.scnprintf = mov__scnprintf,
67};
68
69static 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
88static 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
117out_free_call:
118	regfree(&arm->call_insn);
119out_free_arm:
120	free(arm);
121	return SYMBOL_ANNOTATE_ERRNO__ARCH_INIT_REGEXP;
122}
123