perf/util/parse-regs-options.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <stdbool.h>
0003 #include <stdlib.h>
0004 #include <stdint.h>
0005 #include <string.h>
0006 #include <stdio.h>
0007 #include "util/debug.h"
0008 #include <subcmd/parse-options.h>
0009 #include "util/perf_regs.h"
0010 #include "util/parse-regs-options.h"
0011
0012 static int
0013 __parse_regs(const struct option *opt, const char *str, int unset, bool intr)
0014 {
0015     uint64_t *mode = (uint64_t *)opt->value;
0016     const struct sample_reg *r = NULL;
0017     char *s, *os = NULL, *p;
0018     int ret = -1;
0019     uint64_t mask;
0020
0021     if (unset)
0022         return 0;
0023
0024     /*
0025      * cannot set it twice
0026      */
0027     if (*mode)
0028         return -1;
0029
0030     if (intr)
0031         mask = arch__intr_reg_mask();
0032     else
0033         mask = arch__user_reg_mask();
0034
0035     /* str may be NULL in case no arg is passed to -I */
0036     if (str) {
0037         /* because str is read-only */
0038         s = os = strdup(str);
0039         if (!s)
0040             return -1;
0041
0042         for (;;) {
0043             p = strchr(s, ',');
0044             if (p)
0045                 *p = '\0';
0046
0047             if (!strcmp(s, "?")) {
0048                 fprintf(stderr, "available registers: ");
0049 #ifdef HAVE_PERF_REGS_SUPPORT
0050                 for (r = sample_reg_masks; r->name; r++) {
0051                     if (r->mask & mask)
0052                         fprintf(stderr, "%s ", r->name);
0053                 }
0054 #endif
0055                 fputc('\n', stderr);
0056                 /* just printing available regs */
0057                 goto error;
0058             }
0059 #ifdef HAVE_PERF_REGS_SUPPORT
0060             for (r = sample_reg_masks; r->name; r++) {
0061                 if ((r->mask & mask) && !strcasecmp(s, r->name))
0062                     break;
0063             }
0064 #endif
0065             if (!r || !r->name) {
0066                 ui__warning("Unknown register \"%s\", check man page or run \"perf record %s?\"\n",
0067                         s, intr ? "-I" : "--user-regs=");
0068                 goto error;
0069             }
0070
0071             *mode |= r->mask;
0072
0073             if (!p)
0074                 break;
0075
0076             s = p + 1;
0077         }
0078     }
0079     ret = 0;
0080
0081     /* default to all possible regs */
0082     if (*mode == 0)
0083         *mode = mask;
0084 error:
0085     free(os);
0086     return ret;
0087 }
0088
0089 int
0090 parse_user_regs(const struct option *opt, const char *str, int unset)
0091 {
0092     return __parse_regs(opt, str, unset, false);
0093 }
0094
0095 int
0096 parse_intr_regs(const struct option *opt, const char *str, int unset)
0097 {
0098     return __parse_regs(opt, str, unset, true);
0099 }