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
5int perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
6{
7 int i, idx = 0;
8 u64 mask = regs->mask;
9
10 if (regs->cache_mask & (1 << id))
11 goto out;
12
13 if (!(mask & (1 << id)))
14 return -EINVAL;
15
16 for (i = 0; i < id; i++) {
17 if (mask & (1 << i))
18 idx++;
19 }
20
21 regs->cache_mask |= (1 << id);
22 regs->cache_regs[id] = regs->regs[idx];
23
24out:
25 *valp = regs->cache_regs[id];
26 return 0;
27}