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