36 lines
1.1 KiB
C
36 lines
1.1 KiB
C
|
/* 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 */
|