tools/perf/util/perf_regs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <errno.h>
   3 #include "perf_regs.h"
   4 #include "event.h"
   5
   6 const struct sample_reg __weak sample_reg_masks[] = {
   7         SMPL_REG_END
   8 };
   9
  10 int __weak arch_sdt_arg_parse_op(char *old_op __maybe_unused,
  11                                  char **new_op __maybe_unused)
  12 {
  13         return SDT_ARG_SKIP;
  14 }
  15
  16 #ifdef HAVE_PERF_REGS_SUPPORT
  17 int perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
  18 {
  19         int i, idx = 0;
  20         u64 mask = regs->mask;
  21
  22         if (regs->cache_mask & (1ULL << id))
  23                 goto out;
  24
  25         if (!(mask & (1ULL << id)))
  26                 return -EINVAL;
  27
  28         for (i = 0; i < id; i++) {
  29                 if (mask & (1ULL << i))
  30                         idx++;
  31         }
  32
  33         regs->cache_mask |= (1ULL << id);
  34         regs->cache_regs[id] = regs->regs[idx];
  35
  36 out:
  37         *valp = regs->cache_regs[id];
  38         return 0;
  39 }
  40 #endif