LXR linux/arch/powerpc/include/asm/kup.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_POWERPC_KUP_H_
   3#define _ASM_POWERPC_KUP_H_
   4
   5#ifdef CONFIG_PPC64
   6#include <asm/book3s/64/kup-radix.h>
   7#endif
   8#ifdef CONFIG_PPC_8xx
   9#include <asm/nohash/32/kup-8xx.h>
  10#endif
  11#ifdef CONFIG_PPC_BOOK3S_32
  12#include <asm/book3s/32/kup.h>
  13#endif
  14
  15#ifdef __ASSEMBLY__
  16#ifndef CONFIG_PPC_KUAP
  17.macro kuap_save_and_lock       sp, thread, gpr1, gpr2, gpr3
  18.endm
  19
  20.macro kuap_restore     sp, current, gpr1, gpr2, gpr3
  21.endm
  22
  23.macro kuap_check       current, gpr
  24.endm
  25
  26#endif
  27
  28#else /* !__ASSEMBLY__ */
  29
  30#include <asm/pgtable.h>
  31
  32void setup_kup(void);
  33
  34#ifdef CONFIG_PPC_KUEP
  35void setup_kuep(bool disabled);
  36#else
  37static inline void setup_kuep(bool disabled) { }
  38#endif /* CONFIG_PPC_KUEP */
  39
  40#ifdef CONFIG_PPC_KUAP
  41void setup_kuap(bool disabled);
  42#else
  43static inline void setup_kuap(bool disabled) { }
  44static inline void allow_user_access(void __user *to, const void __user *from,
  45                                     unsigned long size) { }
  46static inline void prevent_user_access(void __user *to, const void __user *from,
  47                                       unsigned long size) { }
  48static inline bool bad_kuap_fault(struct pt_regs *regs, bool is_write) { return false; }
  49#endif /* CONFIG_PPC_KUAP */
  50
  51static inline void allow_read_from_user(const void __user *from, unsigned long size)
  52{
  53        allow_user_access(NULL, from, size);
  54}
  55
  56static inline void allow_write_to_user(void __user *to, unsigned long size)
  57{
  58        allow_user_access(to, NULL, size);
  59}
  60
  61static inline void prevent_read_from_user(const void __user *from, unsigned long size)
  62{
  63        prevent_user_access(NULL, from, size);
  64}
  65
  66static inline void prevent_write_to_user(void __user *to, unsigned long size)
  67{
  68        prevent_user_access(to, NULL, size);
  69}
  70
  71#endif /* !__ASSEMBLY__ */
  72
  73#endif /* _ASM_POWERPC_KUP_H_ */
  74