1 // SPDX-License-Identifier: GPL-2.0
2
3 #include <linux/errno.h>
4 #include <linux/kernel.h>
5 #include <linux/perf_event.h>
6 #include <linux/bug.h>
7 #include <linux/sched/task_stack.h>
8 #include <asm/perf_regs.h>
9 #include <asm/ptrace.h>
10
11 u64 perf_reg_value(struct pt_regs *regs, int idx)
12 {
13 if (WARN_ON_ONCE((u32)idx >= PERF_REG_ARM_MAX))
14 return 0;
15
16 return regs->uregs[idx];
17 }
18
19 #define REG_RESERVED (~((1ULL << PERF_REG_ARM_MAX) - 1))
20
21 int perf_reg_validate(u64 mask)
22 {
23 if (!mask || mask & REG_RESERVED)
24 return -EINVAL;
25
26 return 0;
27 }
28
29 u64 perf_reg_abi(struct task_struct *task)
30 {
31 return PERF_SAMPLE_REGS_ABI_32;
32 }
33
34 void perf_get_regs_user(struct perf_regs *regs_user,
35 struct pt_regs *regs)
36 {
37 regs_user->regs = task_pt_regs(current);
38 regs_user->abi = perf_reg_abi(current);
39 }
40
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