1// SPDX-License-Identifier: GPL-2.0
2#include <stdbool.h>
3#include <stdlib.h>
4#include <stdint.h>
5#include <string.h>
6#include <stdio.h>
7#include "util/debug.h"
8#include <subcmd/parse-options.h>
9#include "util/perf_regs.h"
10#include "util/parse-regs-options.h"
11
12static int
13__parse_regs(const struct option *opt, const char *str, int unset, bool intr)
14{
15 uint64_t *mode = (uint64_t *)opt->value;
16 const struct sample_reg *r = NULL;
17 char *s, *os = NULL, *p;
18 int ret = -1;
19 uint64_t mask;
20
21 if (unset)
22 return 0;
23
24 /*
25 * cannot set it twice
26 */
27 if (*mode)
28 return -1;
29
30 if (intr)
31 mask = arch__intr_reg_mask();
32 else
33 mask = arch__user_reg_mask();
34
35 /* str may be NULL in case no arg is passed to -I */
36 if (str) {
37 /* because str is read-only */
38 s = os = strdup(str);
39 if (!s)
40 return -1;
41
42 for (;;) {
43 p = strchr(s, ',');
44 if (p)
45 *p = '\0';
46
47 if (!strcmp(s, "?")) {
48 fprintf(stderr, "available registers: ");
49 for (r = arch__sample_reg_masks(); r->name; r++) {
50 if (r->mask & mask)
51 fprintf(stderr, "%s ", r->name);
52 }
53 fputc('\n', stderr);
54 /* just printing available regs */
55 goto error;
56 }
57 for (r = arch__sample_reg_masks(); r->name; r++) {
58 if ((r->mask & mask) && !strcasecmp(s, r->name))
59 break;
60 }
61 if (!r || !r->name) {
62 ui__warning("Unknown register \"%s\", check man page or run \"perf record %s?\"\n",
63 s, intr ? "-I" : "--user-regs=");
64 goto error;
65 }
66
67 *mode |= r->mask;
68
69 if (!p)
70 break;
71
72 s = p + 1;
73 }
74 }
75 ret = 0;
76
77 /* default to all possible regs */
78 if (*mode == 0)
79 *mode = mask;
80error:
81 free(os);
82 return ret;
83}
84
85int
86parse_user_regs(const struct option *opt, const char *str, int unset)
87{
88 return __parse_regs(opt, str, unset, false);
89}
90
91int
92parse_intr_regs(const struct option *opt, const char *str, int unset)
93{
94 return __parse_regs(opt, str, unset, true);
95}
96

source code of linux/tools/perf/util/parse-regs-options.c