Merge tag 'devicetree-for-linus' of git://git.secretlab.ca/git/linux
[firefly-linux-kernel-4.4.55.git] / arch / arm64 / kernel / perf_regs.c
1 #include <linux/errno.h>
2 #include <linux/kernel.h>
3 #include <linux/perf_event.h>
4 #include <linux/bug.h>
5
6 #include <asm/compat.h>
7 #include <asm/perf_regs.h>
8 #include <asm/ptrace.h>
9
10 u64 perf_reg_value(struct pt_regs *regs, int idx)
11 {
12         if (WARN_ON_ONCE((u32)idx >= PERF_REG_ARM64_MAX))
13                 return 0;
14
15         /*
16          * Compat (i.e. 32 bit) mode:
17          * - PC has been set in the pt_regs struct in kernel_entry,
18          * - Handle SP and LR here.
19          */
20         if (compat_user_mode(regs)) {
21                 if ((u32)idx == PERF_REG_ARM64_SP)
22                         return regs->compat_sp;
23                 if ((u32)idx == PERF_REG_ARM64_LR)
24                         return regs->compat_lr;
25         }
26
27         return regs->regs[idx];
28 }
29
30 #define REG_RESERVED (~((1ULL << PERF_REG_ARM64_MAX) - 1))
31
32 int perf_reg_validate(u64 mask)
33 {
34         if (!mask || mask & REG_RESERVED)
35                 return -EINVAL;
36
37         return 0;
38 }
39
40 u64 perf_reg_abi(struct task_struct *task)
41 {
42         if (is_compat_thread(task_thread_info(task)))
43                 return PERF_SAMPLE_REGS_ABI_32;
44         else
45                 return PERF_SAMPLE_REGS_ABI_64;
46 }