powerpc/perf/callchain.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 #ifndef _POWERPC_PERF_CALLCHAIN_H
0003 #define _POWERPC_PERF_CALLCHAIN_H
0004
0005 void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry,
0006                 struct pt_regs *regs);
0007 void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry,
0008                 struct pt_regs *regs);
0009
0010 static inline bool invalid_user_sp(unsigned long sp)
0011 {
0012     unsigned long mask = is_32bit_task() ? 3 : 7;
0013     unsigned long top = STACK_TOP - (is_32bit_task() ? 16 : 32);
0014
0015     return (!sp || (sp & mask) || (sp > top));
0016 }
0017
0018 /*
0019  * On 32-bit we just access the address and let hash_page create a
0020  * HPTE if necessary, so there is no need to fall back to reading
0021  * the page tables.  Since this is called at interrupt level,
0022  * do_page_fault() won't treat a DSI as a page fault.
0023  */
0024 static inline int __read_user_stack(const void __user *ptr, void *ret,
0025                     size_t size)
0026 {
0027     unsigned long addr = (unsigned long)ptr;
0028
0029     if (addr > TASK_SIZE - size || (addr & (size - 1)))
0030         return -EFAULT;
0031
0032     return copy_from_user_nofault(ret, ptr, size);
0033 }
0034
0035 #endif /* _POWERPC_PERF_CALLCHAIN_H */