/* SPDX-License-Identifier: GPL-2.0-or-later */ #ifndef _POWERPC_PERF_CALLCHAIN_H #define _POWERPC_PERF_CALLCHAIN_H void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs); void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs); static inline bool invalid_user_sp(unsigned long sp) { unsigned long mask = is_32bit_task() ? 3 : 7; unsigned long top = STACK_TOP - (is_32bit_task() ? 16 : 32); return (!sp || (sp & mask) || (sp > top)); } /* * On 32-bit we just access the address and let hash_page create a * HPTE if necessary, so there is no need to fall back to reading * the page tables. Since this is called at interrupt level, * do_page_fault() won't treat a DSI as a page fault. */ static inline int __read_user_stack(const void __user *ptr, void *ret, size_t size) { unsigned long addr = (unsigned long)ptr; if (addr > TASK_SIZE - size || (addr & (size - 1))) return -EFAULT; return copy_from_user_nofault(ret, ptr, size); } #endif /* _POWERPC_PERF_CALLCHAIN_H */