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117 lines
2.1 KiB
117 lines
2.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_POWERPC_KUP_8XX_H_ |
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#define _ASM_POWERPC_KUP_8XX_H_ |
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#include <asm/bug.h> |
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#include <asm/mmu.h> |
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#ifdef CONFIG_PPC_KUAP |
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#ifndef __ASSEMBLY__ |
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#include <linux/jump_label.h> |
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#include <asm/reg.h> |
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extern struct static_key_false disable_kuap_key; |
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static __always_inline bool kuap_is_disabled(void) |
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{ |
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return static_branch_unlikely(&disable_kuap_key); |
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} |
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static inline void kuap_save_and_lock(struct pt_regs *regs) |
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{ |
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if (kuap_is_disabled()) |
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return; |
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regs->kuap = mfspr(SPRN_MD_AP); |
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mtspr(SPRN_MD_AP, MD_APG_KUAP); |
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} |
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static inline void kuap_user_restore(struct pt_regs *regs) |
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{ |
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} |
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static inline void kuap_kernel_restore(struct pt_regs *regs, unsigned long kuap) |
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{ |
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if (kuap_is_disabled()) |
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return; |
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mtspr(SPRN_MD_AP, regs->kuap); |
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} |
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static inline unsigned long kuap_get_and_assert_locked(void) |
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{ |
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unsigned long kuap; |
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if (kuap_is_disabled()) |
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return MD_APG_INIT; |
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kuap = mfspr(SPRN_MD_AP); |
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if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG)) |
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WARN_ON_ONCE(kuap >> 16 != MD_APG_KUAP >> 16); |
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return kuap; |
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} |
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static inline void kuap_assert_locked(void) |
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{ |
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if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG) && !kuap_is_disabled()) |
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kuap_get_and_assert_locked(); |
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} |
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static inline void allow_user_access(void __user *to, const void __user *from, |
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unsigned long size, unsigned long dir) |
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{ |
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if (kuap_is_disabled()) |
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return; |
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mtspr(SPRN_MD_AP, MD_APG_INIT); |
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} |
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static inline void prevent_user_access(unsigned long dir) |
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{ |
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if (kuap_is_disabled()) |
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return; |
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mtspr(SPRN_MD_AP, MD_APG_KUAP); |
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} |
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static inline unsigned long prevent_user_access_return(void) |
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{ |
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unsigned long flags; |
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if (kuap_is_disabled()) |
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return MD_APG_INIT; |
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flags = mfspr(SPRN_MD_AP); |
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mtspr(SPRN_MD_AP, MD_APG_KUAP); |
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return flags; |
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} |
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static inline void restore_user_access(unsigned long flags) |
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{ |
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if (kuap_is_disabled()) |
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return; |
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mtspr(SPRN_MD_AP, flags); |
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} |
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static inline bool |
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bad_kuap_fault(struct pt_regs *regs, unsigned long address, bool is_write) |
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{ |
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if (kuap_is_disabled()) |
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return false; |
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return !((regs->kuap ^ MD_APG_KUAP) & 0xff000000); |
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} |
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#endif /* !__ASSEMBLY__ */ |
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#endif /* CONFIG_PPC_KUAP */ |
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#endif /* _ASM_POWERPC_KUP_8XX_H_ */
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