tools/perf/util/parse-regs-options.c

   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
  12 static 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 #ifdef HAVE_PERF_REGS_SUPPORT
  50                                 for (r = sample_reg_masks; r->name; r++) {
  51                                         if (r->mask & mask)
  52                                                 fprintf(stderr, "%s ", r->name);
  53                                 }
  54 #endif
  55                                 fputc('\n', stderr);
  56                                 /* just printing available regs */
  57                                 goto error;
  58                         }
  59 #ifdef HAVE_PERF_REGS_SUPPORT
  60                         for (r = sample_reg_masks; r->name; r++) {
  61                                 if ((r->mask & mask) && !strcasecmp(s, r->name))
  62                                         break;
  63                         }
  64 #endif
  65                         if (!r || !r->name) {
  66                                 ui__warning("Unknown register \"%s\", check man page or run \"perf record %s?\"\n",
  67                                             s, intr ? "-I" : "--user-regs=");
  68                                 goto error;
  69                         }
  70
  71                         *mode |= r->mask;
  72
  73                         if (!p)
  74                                 break;
  75
  76                         s = p + 1;
  77                 }
  78         }
  79         ret = 0;
  80
  81         /* default to all possible regs */
  82         if (*mode == 0)
  83                 *mode = mask;
  84 error:
  85         free(os);
  86         return ret;
  87 }
  88
  89 int
  90 parse_user_regs(const struct option *opt, const char *str, int unset)
  91 {
  92         return __parse_regs(opt, str, unset, false);
  93 }
  94
  95 int
  96 parse_intr_regs(const struct option *opt, const char *str, int unset)
  97 {
  98         return __parse_regs(opt, str, unset, true);
  99 }