Cregit: Linux 6.12: callchain.h

Contributors: 6
Author	Tokens	Token Proportion	Commits	Commit Proportion
Michal Suchanek	117	75.00%	3	37.50%
Paul Mackerras	29	18.59%	1	12.50%
Frédéric Weisbecker	6	3.85%	1	12.50%
Arnaldo Carvalho de Melo	2	1.28%	1	12.50%
Christoph Hellwig	1	0.64%	1	12.50%
Nicholas Piggin	1	0.64%	1	12.50%
Total	156		8

/* 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 */