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