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 perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
10{
11 int i, idx = 0;
12 u64 mask = regs->mask;
13
14 if (regs->cache_mask & (1 << id))
15 goto out;
16
17 if (!(mask & (1 << id)))
18 return -EINVAL;
19
20 for (i = 0; i < id; i++) {
21 if (mask & (1 << i))
22 idx++;
23 }
24
25 regs->cache_mask |= (1 << id);
26 regs->cache_regs[id] = regs->regs[idx];
27
28out:
29 *valp = regs->cache_regs[id];
30 return 0;
31}