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 int __weak arch_sdt_arg_parse_op(char *old_op __maybe_unused,
   7                                  char **new_op __maybe_unused)
   8 {
   9         return SDT_ARG_SKIP;
  10 }
  11
  12 uint64_t __weak arch__intr_reg_mask(void)
  13 {
  14         return PERF_REGS_MASK;
  15 }
  16
  17 uint64_t __weak arch__user_reg_mask(void)
  18 {
  19         return PERF_REGS_MASK;
  20 }
  21
  22 #ifdef HAVE_PERF_REGS_SUPPORT
  23 int perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
  24 {
  25         int i, idx = 0;
  26         u64 mask = regs->mask;
  27
  28         if (regs->cache_mask & (1ULL << id))
  29                 goto out;
  30
  31         if (!(mask & (1ULL << id)))
  32                 return -EINVAL;
  33
  34         for (i = 0; i < id; i++) {
  35                 if (mask & (1ULL << i))
  36                         idx++;
  37         }
  38
  39         regs->cache_mask |= (1ULL << id);
  40         regs->cache_regs[id] = regs->regs[idx];
  41
  42 out:
  43         *valp = regs->cache_regs[id];
  44         return 0;
  45 }
  46 #endif