projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c0eda1a MS |
1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 2 | #ifndef _POWERPC_PERF_CALLCHAIN_H | |
| 3 | #define _POWERPC_PERF_CALLCHAIN_H | |
| 4 | ||
| 7c0eda1a MS |
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 | ||
| d3a133aa MS |
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; | |
| d3a133aa MS |
28 | |
| 29 | if (addr > TASK_SIZE - size || (addr & (size - 1))) | |
| 30 | return -EFAULT; | |
| 31 | ||
| 8b91cee5 | 32 | return copy_from_user_nofault(ret, ptr, size); |
| d3a133aa MS |
33 | } |
| 34 | ||
| 7c0eda1a | 35 | #endif /* _POWERPC_PERF_CALLCHAIN_H */ |