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(ret, ptr, size);
33 }
34
35 #endif /* _POWERPC_PERF_CALLCHAIN_H */
36
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