tools/perf/util/perf_regs.c

   1 #include <errno.h>
   2 #include "perf_regs.h"
   3 #include "event.h"
   4
   5 const struct sample_reg __weak sample_reg_masks[] = {
   6         SMPL_REG_END
   7 };
   8
   9 int __weak arch_sdt_arg_parse_op(char *old_op __maybe_unused,
  10                                  char **new_op __maybe_unused)
  11 {
  12         return SDT_ARG_SKIP;
  13 }
  14
  15 #ifdef HAVE_PERF_REGS_SUPPORT
  16 int perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
  17 {
  18         int i, idx = 0;
  19         u64 mask = regs->mask;
  20
  21         if (regs->cache_mask & (1ULL << id))
  22                 goto out;
  23
  24         if (!(mask & (1ULL << id)))
  25                 return -EINVAL;
  26
  27         for (i = 0; i < id; i++) {
  28                 if (mask & (1ULL << i))
  29                         idx++;
  30         }
  31
  32         regs->cache_mask |= (1ULL << id);
  33         regs->cache_regs[id] = regs->regs[idx];
  34
  35 out:
  36         *valp = regs->cache_regs[id];
  37         return 0;
  38 }
  39 #endif