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 perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
  10 {
  11         int i, idx = 0;
  12         u64 mask = regs->mask;
  13
  14         if (regs->cache_mask & (1 << id))
  15                 goto out;
  16
  17         if (!(mask & (1 << id)))
  18                 return -EINVAL;
  19
  20         for (i = 0; i < id; i++) {
  21                 if (mask & (1 << i))
  22                         idx++;
  23         }
  24
  25         regs->cache_mask |= (1 << id);
  26         regs->cache_regs[id] = regs->regs[idx];
  27
  28 out:
  29         *valp = regs->cache_regs[id];
  30         return 0;
  31 }