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2ee0d7fd JP |
1 | #include <linux/errno.h> |
2 | #include <linux/kernel.h> | |
3 | #include <linux/perf_event.h> | |
4 | #include <linux/bug.h> | |
ff268ff7 MS |
5 | |
6 | #include <asm/compat.h> | |
2ee0d7fd JP |
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 | ||
5b75a6af WD |
27 | if ((u32)idx == PERF_REG_ARM64_SP) |
28 | return regs->sp; | |
29 | ||
30 | if ((u32)idx == PERF_REG_ARM64_PC) | |
31 | return regs->pc; | |
32 | ||
2ee0d7fd JP |
33 | return regs->regs[idx]; |
34 | } | |
35 | ||
36 | #define REG_RESERVED (~((1ULL << PERF_REG_ARM64_MAX) - 1)) | |
37 | ||
38 | int perf_reg_validate(u64 mask) | |
39 | { | |
40 | if (!mask || mask & REG_RESERVED) | |
41 | return -EINVAL; | |
42 | ||
43 | return 0; | |
44 | } | |
45 | ||
46 | u64 perf_reg_abi(struct task_struct *task) | |
47 | { | |
48 | if (is_compat_thread(task_thread_info(task))) | |
49 | return PERF_SAMPLE_REGS_ABI_32; | |
50 | else | |
51 | return PERF_SAMPLE_REGS_ABI_64; | |
52 | } | |
88a7c26a AL |
53 | |
54 | void perf_get_regs_user(struct perf_regs *regs_user, | |
55 | struct pt_regs *regs, | |
56 | struct pt_regs *regs_user_copy) | |
57 | { | |
58 | regs_user->regs = task_pt_regs(current); | |
59 | regs_user->abi = perf_reg_abi(current); | |
60 | } |