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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _POWERPC_PERF_CALLCHAIN_H
#define _POWERPC_PERF_CALLCHAIN_H
int read_user_stack_slow(const void __user *ptr, void *buf, int nb);
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;
int rc;
if (addr > TASK_SIZE - size || (addr & (size - 1)))
return -EFAULT;
rc = copy_from_user_nofault(ret, ptr, size);
if (IS_ENABLED(CONFIG_PPC64) && rc)
return read_user_stack_slow(ptr, ret, size);
return rc;
}
#endif /* _POWERPC_PERF_CALLCHAIN_H */
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