| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
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| 2 | #ifndef _POWERPC_PERF_CALLCHAIN_H |
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| 3 | #define _POWERPC_PERF_CALLCHAIN_H |
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| 4 | |
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| 5 | void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry, |
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| 6 | struct pt_regs *regs); |
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| 7 | void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry, |
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| 8 | struct pt_regs *regs); |
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| 9 | |
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| 10 | static inline bool invalid_user_sp(unsigned long sp) |
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| 11 | { |
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| 12 | unsigned long mask = is_32bit_task() ? 3 : 7; |
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| 13 | unsigned long top = STACK_TOP - (is_32bit_task() ? 16 : 32); |
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| 14 | |
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| 15 | return (!sp || (sp & mask) || (sp > top)); |
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| 16 | } |
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| 17 | |
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| 18 | /* |
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| 19 | * On 32-bit we just access the address and let hash_page create a |
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| 20 | * HPTE if necessary, so there is no need to fall back to reading |
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| 21 | * the page tables. Since this is called at interrupt level, |
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| 22 | * do_page_fault() won't treat a DSI as a page fault. |
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| 23 | */ |
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| 24 | static inline int __read_user_stack(const void __user *ptr, void *ret, |
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| 25 | size_t size) |
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| 26 | { |
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| 27 | unsigned long addr = (unsigned long)ptr; |
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| 28 | |
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| 29 | if (addr > TASK_SIZE - size || (addr & (size - 1))) |
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| 30 | return -EFAULT; |
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| 31 | |
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| 32 | return copy_from_user_nofault(dst: ret, src: ptr, size); |
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| 33 | } |
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| 34 | |
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| 35 | #endif /* _POWERPC_PERF_CALLCHAIN_H */ |
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| 36 | |
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