#ifndef _POWERPC_PERF_CALLCHAIN_H
#define _POWERPC_PERF_CALLCHAIN_H
-int read_user_stack_slow(void __user *ptr, void *buf, int nb);
+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,
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 */
#endif /* CONFIG_PPC64 */
-/*
- * 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 int read_user_stack_32(unsigned int __user *ptr, unsigned int *ret)
+static int read_user_stack_32(const unsigned int __user *ptr, unsigned int *ret)
{
- int rc;
-
- if ((unsigned long)ptr > TASK_SIZE - sizeof(unsigned int) ||
- ((unsigned long)ptr & 3))
- return -EFAULT;
-
- rc = copy_from_user_nofault(ret, ptr, sizeof(*ret));
-
- if (IS_ENABLED(CONFIG_PPC64) && rc)
- return read_user_stack_slow(ptr, ret, 4);
-
- return rc;
+ return __read_user_stack(ptr, ret, sizeof(*ret));
}
/*
* interrupt context, so if the access faults, we read the page tables
* to find which page (if any) is mapped and access it directly.
*/
-int read_user_stack_slow(void __user *ptr, void *buf, int nb)
+int read_user_stack_slow(const void __user *ptr, void *buf, int nb)
{
unsigned long addr = (unsigned long) ptr;
return -EFAULT;
}
-static int read_user_stack_64(unsigned long __user *ptr, unsigned long *ret)
+static int read_user_stack_64(const unsigned long __user *ptr, unsigned long *ret)
{
- if ((unsigned long)ptr > TASK_SIZE - sizeof(unsigned long) ||
- ((unsigned long)ptr & 7))
- return -EFAULT;
-
- if (!copy_from_user_nofault(ret, ptr, sizeof(*ret)))
- return 0;
-
- return read_user_stack_slow(ptr, ret, 8);
+ return __read_user_stack(ptr, ret, sizeof(*ret));
}
/*