43 строки
1.2 KiB
C
43 строки
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _POWERPC_PERF_CALLCHAIN_H
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#define _POWERPC_PERF_CALLCHAIN_H
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int read_user_stack_slow(const void __user *ptr, void *buf, int nb);
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void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry,
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struct pt_regs *regs);
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void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry,
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struct pt_regs *regs);
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static inline bool invalid_user_sp(unsigned long sp)
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{
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unsigned long mask = is_32bit_task() ? 3 : 7;
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unsigned long top = STACK_TOP - (is_32bit_task() ? 16 : 32);
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return (!sp || (sp & mask) || (sp > top));
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}
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/*
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* On 32-bit we just access the address and let hash_page create a
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* HPTE if necessary, so there is no need to fall back to reading
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* the page tables. Since this is called at interrupt level,
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* do_page_fault() won't treat a DSI as a page fault.
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*/
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static inline int __read_user_stack(const void __user *ptr, void *ret,
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size_t size)
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{
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unsigned long addr = (unsigned long)ptr;
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int rc;
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if (addr > TASK_SIZE - size || (addr & (size - 1)))
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return -EFAULT;
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rc = copy_from_user_nofault(ret, ptr, size);
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if (IS_ENABLED(CONFIG_PPC64) && !radix_enabled() && rc)
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return read_user_stack_slow(ptr, ret, size);
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return rc;
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}
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#endif /* _POWERPC_PERF_CALLCHAIN_H */
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