111 lines
2.0 KiB
C
111 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_KUP_BOOKE_H_
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#define _ASM_POWERPC_KUP_BOOKE_H_
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#include <asm/bug.h>
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#ifdef CONFIG_PPC_KUAP
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#ifdef __ASSEMBLY__
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.macro kuap_check_amr gpr1, gpr2
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.endm
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#else
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#include <linux/jump_label.h>
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#include <linux/sched.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_lock(void)
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{
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mtspr(SPRN_PID, 0);
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isync();
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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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regs->kuap = mfspr(SPRN_PID);
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mtspr(SPRN_PID, 0);
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isync();
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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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if (kuap_is_disabled())
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return;
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mtspr(SPRN_PID, current->thread.pid);
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/* Context synchronisation is performed by rfi */
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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 (regs->kuap)
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mtspr(SPRN_PID, current->thread.pid);
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/* Context synchronisation is performed by rfi */
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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 = mfspr(SPRN_PID);
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if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG))
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WARN_ON_ONCE(kuap);
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return kuap;
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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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mtspr(SPRN_PID, current->thread.pid);
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isync();
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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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mtspr(SPRN_PID, 0);
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isync();
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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 = mfspr(SPRN_PID);
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mtspr(SPRN_PID, 0);
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isync();
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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 (flags) {
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mtspr(SPRN_PID, current->thread.pid);
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isync();
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}
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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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return !regs->kuap;
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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_BOOKE_H_ */
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