17c0eda1aSMichal Suchanek /* SPDX-License-Identifier: GPL-2.0-or-later */
27c0eda1aSMichal Suchanek #ifndef _POWERPC_PERF_CALLCHAIN_H
37c0eda1aSMichal Suchanek #define _POWERPC_PERF_CALLCHAIN_H
47c0eda1aSMichal Suchanek
57c0eda1aSMichal Suchanek void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry,
67c0eda1aSMichal Suchanek struct pt_regs *regs);
77c0eda1aSMichal Suchanek void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry,
87c0eda1aSMichal Suchanek struct pt_regs *regs);
97c0eda1aSMichal Suchanek
invalid_user_sp(unsigned long sp)107c0eda1aSMichal Suchanek static inline bool invalid_user_sp(unsigned long sp)
117c0eda1aSMichal Suchanek {
127c0eda1aSMichal Suchanek unsigned long mask = is_32bit_task() ? 3 : 7;
137c0eda1aSMichal Suchanek unsigned long top = STACK_TOP - (is_32bit_task() ? 16 : 32);
147c0eda1aSMichal Suchanek
157c0eda1aSMichal Suchanek return (!sp || (sp & mask) || (sp > top));
167c0eda1aSMichal Suchanek }
177c0eda1aSMichal Suchanek
18d3a133aaSMichal Suchanek /*
19d3a133aaSMichal Suchanek * On 32-bit we just access the address and let hash_page create a
20d3a133aaSMichal Suchanek * HPTE if necessary, so there is no need to fall back to reading
21d3a133aaSMichal Suchanek * the page tables. Since this is called at interrupt level,
22d3a133aaSMichal Suchanek * do_page_fault() won't treat a DSI as a page fault.
23d3a133aaSMichal Suchanek */
__read_user_stack(const void __user * ptr,void * ret,size_t size)24d3a133aaSMichal Suchanek static inline int __read_user_stack(const void __user *ptr, void *ret,
25d3a133aaSMichal Suchanek size_t size)
26d3a133aaSMichal Suchanek {
27d3a133aaSMichal Suchanek unsigned long addr = (unsigned long)ptr;
28d3a133aaSMichal Suchanek
29d3a133aaSMichal Suchanek if (addr > TASK_SIZE - size || (addr & (size - 1)))
30d3a133aaSMichal Suchanek return -EFAULT;
31d3a133aaSMichal Suchanek
32*c3543bacSNicholas Piggin return copy_from_user_nofault(ret, ptr, size);
33d3a133aaSMichal Suchanek }
34d3a133aaSMichal Suchanek
357c0eda1aSMichal Suchanek #endif /* _POWERPC_PERF_CALLCHAIN_H */
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