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 #ifdef HAVE_PERF_REGS_SUPPORT
  10 int perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
  11 {
  12         int i, idx = 0;
  13         u64 mask = regs->mask;
  14
  15         if (regs->cache_mask & (1ULL << id))
  16                 goto out;
  17
  18         if (!(mask & (1ULL << id)))
  19                 return -EINVAL;
  20
  21         for (i = 0; i < id; i++) {
  22                 if (mask & (1ULL << i))
  23                         idx++;
  24         }
  25
  26         regs->cache_mask |= (1ULL << id);
  27         regs->cache_regs[id] = regs->regs[idx];
  28
  29 out:
  30         *valp = regs->cache_regs[id];
  31         return 0;
  32 }
  33 #endif