LXR linux/tools/perf/util/perf

   1#include <errno.h>
   2#include "perf_regs.h"
   3#include "event.h"
   4
   5int 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
  24out:
  25        *valp = regs->cache_regs[id];
  26        return 0;
  27}
  28