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

   1// SPDX-License-Identifier: GPL-2.0
   2#include "perf.h"
   3#include "util/util.h"
   4#include "util/debug.h"
   5#include <subcmd/parse-options.h>
   6#include "util/parse-regs-options.h"
   7
   8int
   9parse_regs(const struct option *opt, const char *str, int unset)
  10{
  11        uint64_t *mode = (uint64_t *)opt->value;
  12        const struct sample_reg *r;
  13        char *s, *os = NULL, *p;
  14        int ret = -1;
  15
  16        if (unset)
  17                return 0;
  18
  19        /*
  20         * cannot set it twice
  21         */
  22        if (*mode)
  23                return -1;
  24
  25        /* str may be NULL in case no arg is passed to -I */
  26        if (str) {
  27                /* because str is read-only */
  28                s = os = strdup(str);
  29                if (!s)
  30                        return -1;
  31
  32                for (;;) {
  33                        p = strchr(s, ',');
  34                        if (p)
  35                                *p = '\0';
  36
  37                        if (!strcmp(s, "?")) {
  38                                fprintf(stderr, "available registers: ");
  39                                for (r = sample_reg_masks; r->name; r++) {
  40                                        fprintf(stderr, "%s ", r->name);
  41                                }
  42                                fputc('\n', stderr);
  43                                /* just printing available regs */
  44                                return -1;
  45                        }
  46                        for (r = sample_reg_masks; r->name; r++) {
  47                                if (!strcasecmp(s, r->name))
  48                                        break;
  49                        }
  50                        if (!r->name) {
  51                                ui__warning("unknown register %s,"
  52                                            " check man page\n", s);
  53                                goto error;
  54                        }
  55
  56                        *mode |= r->mask;
  57
  58                        if (!p)
  59                                break;
  60
  61                        s = p + 1;
  62                }
  63        }
  64        ret = 0;
  65
  66        /* default to all possible regs */
  67        if (*mode == 0)
  68                *mode = PERF_REGS_MASK;
  69error:
  70        free(os);
  71        return ret;
  72}
  73