/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_POWERPC_KUP_8XX_H_ #define _ASM_POWERPC_KUP_8XX_H_ #include <asm/bug.h> #include <asm/mmu.h> #ifdef CONFIG_PPC_KUAP #ifdef __ASSEMBLY__ .macro kuap_save_and_lock sp, thread, gpr1, gpr2, gpr3 lis \gpr2, MD_APG_KUAP@h /* only APG0 and APG1 are used */ mfspr \gpr1, SPRN_MD_AP mtspr SPRN_MD_AP, \gpr2 stw \gpr1, STACK_REGS_KUAP(\sp) .endm .macro kuap_restore sp, current, gpr1, gpr2, gpr3 lwz \gpr1, STACK_REGS_KUAP(\sp) mtspr SPRN_MD_AP, \gpr1 .endm .macro kuap_check current, gpr #ifdef CONFIG_PPC_KUAP_DEBUG mfspr \gpr, SPRN_MD_AP rlwinm \gpr, \gpr, 16, 0xffff 999: twnei \gpr, MD_APG_KUAP@h EMIT_BUG_ENTRY 999b, __FILE__, __LINE__, (BUGFLAG_WARNING | BUGFLAG_ONCE) #endif .endm #else /* !__ASSEMBLY__ */ #include <asm/reg.h> static inline void allow_user_access(void __user *to, const void __user *from, unsigned long size, unsigned long dir) { mtspr(SPRN_MD_AP, MD_APG_INIT); } static inline void prevent_user_access(void __user *to, const void __user *from, unsigned long size, unsigned long dir) { mtspr(SPRN_MD_AP, MD_APG_KUAP); } static inline unsigned long prevent_user_access_return(void) { unsigned long flags = mfspr(SPRN_MD_AP); mtspr(SPRN_MD_AP, MD_APG_KUAP); return flags; } static inline void restore_user_access(unsigned long flags) { mtspr(SPRN_MD_AP, flags); } static inline bool bad_kuap_fault(struct pt_regs *regs, unsigned long address, bool is_write) { return WARN(!((regs->kuap ^ MD_APG_KUAP) & 0xf0000000), "Bug: fault blocked by AP register !"); } #endif /* !__ASSEMBLY__ */ #endif /* CONFIG_PPC_KUAP */ #endif /* _ASM_POWERPC_KUP_8XX_H_ */