1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
2 | #ifndef _POWERPC_PERF_CALLCHAIN_H |
3 | #define _POWERPC_PERF_CALLCHAIN_H |
4 | |
5 | void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry, |
6 | struct pt_regs *regs); |
7 | void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry, |
8 | struct pt_regs *regs); |
9 | |
10 | static inline bool invalid_user_sp(unsigned long sp) |
11 | { |
12 | unsigned long mask = is_32bit_task() ? 3 : 7; |
13 | unsigned long top = STACK_TOP - (is_32bit_task() ? 16 : 32); |
14 | |
15 | return (!sp || (sp & mask) || (sp > top)); |
16 | } |
17 | |
18 | /* |
19 | * On 32-bit we just access the address and let hash_page create a |
20 | * HPTE if necessary, so there is no need to fall back to reading |
21 | * the page tables. Since this is called at interrupt level, |
22 | * do_page_fault() won't treat a DSI as a page fault. |
23 | */ |
24 | static inline int __read_user_stack(const void __user *ptr, void *ret, |
25 | size_t size) |
26 | { |
27 | unsigned long addr = (unsigned long)ptr; |
28 | |
29 | if (addr > TASK_SIZE - size || (addr & (size - 1))) |
30 | return -EFAULT; |
31 | |
32 | return copy_from_user_nofault(dst: ret, src: ptr, size); |
33 | } |
34 | |
35 | #endif /* _POWERPC_PERF_CALLCHAIN_H */ |
36 | |