GNU Linux-libre 4.19.211-gnu1
[releases.git] / 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