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 uint64_t __weak arch__intr_reg_mask(void)
  17 {
  18         return PERF_REGS_MASK;
  19 }
  20
  21 uint64_t __weak arch__user_reg_mask(void)
  22 {
  23         return PERF_REGS_MASK;
  24 }
  25
  26 #ifdef HAVE_PERF_REGS_SUPPORT
  27 int perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
  28 {
  29         int i, idx = 0;
  30         u64 mask = regs->mask;
  31
  32         if (regs->cache_mask & (1ULL << id))
  33                 goto out;
  34
  35         if (!(mask & (1ULL << id)))
  36                 return -EINVAL;
  37
  38         for (i = 0; i < id; i++) {
  39                 if (mask & (1ULL << i))
  40                         idx++;
  41         }
  42
  43         regs->cache_mask |= (1ULL << id);
  44         regs->cache_regs[id] = regs->regs[idx];
  45
  46 out:
  47         *valp = regs->cache_regs[id];
  48         return 0;
  49 }
  50 #endif