tools/perf/util/perf_regs.c

   1 #include <errno.h>
   2 #include "perf_regs.h"
   3 #include "event.h"
   4
   5 int perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
   6 {
   7         int i, idx = 0;
   8         u64 mask = regs->mask;
   9
  10         if (regs->cache_mask & (1 << id))
  11                 goto out;
  12
  13         if (!(mask & (1 << id)))
  14                 return -EINVAL;
  15
  16         for (i = 0; i < id; i++) {
  17                 if (mask & (1 << i))
  18                         idx++;
  19         }
  20
  21         regs->cache_mask |= (1 << id);
  22         regs->cache_regs[id] = regs->regs[idx];
  23
  24 out:
  25         *valp = regs->cache_regs[id];
  26         return 0;
  27 }