1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2#ifndef _POWERPC_PERF_CALLCHAIN_H
 3#define _POWERPC_PERF_CALLCHAIN_H
 4
 5void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry,
 6			    struct pt_regs *regs);
 7void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry,
 8			    struct pt_regs *regs);
 9
10static 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 */
24static 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 */