1 // SPDX-License-Identifier: GPL-2.0
2 #include <errno.h>
3 #include <regex.h>
4 #include <string.h>
5 #include <linux/kernel.h>
6 #include <linux/zalloc.h>
7
8 #include "../../../util/debug.h"
9 #include "../../../util/event.h"
10 #include "../../../util/perf_regs.h"
11
12 const struct sample_reg sample_reg_masks[] = {
13 SMPL_REG(x0, PERF_REG_ARM64_X0),
14 SMPL_REG(x1, PERF_REG_ARM64_X1),
15 SMPL_REG(x2, PERF_REG_ARM64_X2),
16 SMPL_REG(x3, PERF_REG_ARM64_X3),
17 SMPL_REG(x4, PERF_REG_ARM64_X4),
18 SMPL_REG(x5, PERF_REG_ARM64_X5),
19 SMPL_REG(x6, PERF_REG_ARM64_X6),
20 SMPL_REG(x7, PERF_REG_ARM64_X7),
21 SMPL_REG(x8, PERF_REG_ARM64_X8),
22 SMPL_REG(x9, PERF_REG_ARM64_X9),
23 SMPL_REG(x10, PERF_REG_ARM64_X10),
24 SMPL_REG(x11, PERF_REG_ARM64_X11),
25 SMPL_REG(x12, PERF_REG_ARM64_X12),
26 SMPL_REG(x13, PERF_REG_ARM64_X13),
27 SMPL_REG(x14, PERF_REG_ARM64_X14),
28 SMPL_REG(x15, PERF_REG_ARM64_X15),
29 SMPL_REG(x16, PERF_REG_ARM64_X16),
30 SMPL_REG(x17, PERF_REG_ARM64_X17),
31 SMPL_REG(x18, PERF_REG_ARM64_X18),
32 SMPL_REG(x19, PERF_REG_ARM64_X19),
33 SMPL_REG(x20, PERF_REG_ARM64_X20),
34 SMPL_REG(x21, PERF_REG_ARM64_X21),
35 SMPL_REG(x22, PERF_REG_ARM64_X22),
36 SMPL_REG(x23, PERF_REG_ARM64_X23),
37 SMPL_REG(x24, PERF_REG_ARM64_X24),
38 SMPL_REG(x25, PERF_REG_ARM64_X25),
39 SMPL_REG(x26, PERF_REG_ARM64_X26),
40 SMPL_REG(x27, PERF_REG_ARM64_X27),
41 SMPL_REG(x28, PERF_REG_ARM64_X28),
42 SMPL_REG(x29, PERF_REG_ARM64_X29),
43 SMPL_REG(lr, PERF_REG_ARM64_LR),
44 SMPL_REG(sp, PERF_REG_ARM64_SP),
45 SMPL_REG(pc, PERF_REG_ARM64_PC),
46 SMPL_REG_END
47 };
48
49 /* %xNUM */
50 #define SDT_OP_REGEX1 "^(x[1-2]?[0-9]|3[0-1])$"
51
52 /* [sp], [sp, NUM] */
53 #define SDT_OP_REGEX2 "^\\[sp(, )?([0-9]+)?\\]$"
54
55 static regex_t sdt_op_regex1, sdt_op_regex2;
56
sdt_init_op_regex(void)57 static int sdt_init_op_regex(void)
58 {
59 static int initialized;
60 int ret = 0;
61
62 if (initialized)
63 return 0;
64
65 ret = regcomp(&sdt_op_regex1, SDT_OP_REGEX1, REG_EXTENDED);
66 if (ret)
67 goto error;
68
69 ret = regcomp(&sdt_op_regex2, SDT_OP_REGEX2, REG_EXTENDED);
70 if (ret)
71 goto free_regex1;
72
73 initialized = 1;
74 return 0;
75
76 free_regex1:
77 regfree(&sdt_op_regex1);
78 error:
79 pr_debug4("Regex compilation error.\n");
80 return ret;
81 }
82
83 /*
84 * SDT marker arguments on Arm64 uses %xREG or [sp, NUM], currently
85 * support these two formats.
86 */
arch_sdt_arg_parse_op(char * old_op,char ** new_op)87 int arch_sdt_arg_parse_op(char *old_op, char **new_op)
88 {
89 int ret, new_len;
90 regmatch_t rm[5];
91
92 ret = sdt_init_op_regex();
93 if (ret < 0)
94 return ret;
95
96 if (!regexec(&sdt_op_regex1, old_op, 3, rm, 0)) {
97 /* Extract xNUM */
98 new_len = 2; /* % NULL */
99 new_len += (int)(rm[1].rm_eo - rm[1].rm_so);
100
101 *new_op = zalloc(new_len);
102 if (!*new_op)
103 return -ENOMEM;
104
105 scnprintf(*new_op, new_len, "%%%.*s",
106 (int)(rm[1].rm_eo - rm[1].rm_so), old_op + rm[1].rm_so);
107 } else if (!regexec(&sdt_op_regex2, old_op, 5, rm, 0)) {
108 /* [sp], [sp, NUM] or [sp,NUM] */
109 new_len = 7; /* + ( % s p ) NULL */
110
111 /* If the argument is [sp], need to fill offset '0' */
112 if (rm[2].rm_so == -1)
113 new_len += 1;
114 else
115 new_len += (int)(rm[2].rm_eo - rm[2].rm_so);
116
117 *new_op = zalloc(new_len);
118 if (!*new_op)
119 return -ENOMEM;
120
121 if (rm[2].rm_so == -1)
122 scnprintf(*new_op, new_len, "+0(%%sp)");
123 else
124 scnprintf(*new_op, new_len, "+%.*s(%%sp)",
125 (int)(rm[2].rm_eo - rm[2].rm_so),
126 old_op + rm[2].rm_so);
127 } else {
128 pr_debug4("Skipping unsupported SDT argument: %s\n", old_op);
129 return SDT_ARG_SKIP;
130 }
131
132 return SDT_ARG_VALID;
133 }
134
