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73 lines
1.6 KiB
73 lines
1.6 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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#ifdef __ASSEMBLY__ |
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.macro kuap_save_and_lock sp, thread, gpr1, gpr2, gpr3 |
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lis \gpr2, MD_APG_KUAP@h /* only APG0 and APG1 are used */ |
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mfspr \gpr1, SPRN_MD_AP |
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mtspr SPRN_MD_AP, \gpr2 |
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stw \gpr1, STACK_REGS_KUAP(\sp) |
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.endm |
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.macro kuap_restore sp, current, gpr1, gpr2, gpr3 |
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lwz \gpr1, STACK_REGS_KUAP(\sp) |
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mtspr SPRN_MD_AP, \gpr1 |
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.endm |
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.macro kuap_check current, gpr |
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#ifdef CONFIG_PPC_KUAP_DEBUG |
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mfspr \gpr, SPRN_MD_AP |
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rlwinm \gpr, \gpr, 16, 0xffff |
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999: twnei \gpr, MD_APG_KUAP@h |
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EMIT_BUG_ENTRY 999b, __FILE__, __LINE__, (BUGFLAG_WARNING | BUGFLAG_ONCE) |
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#endif |
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.endm |
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#else /* !__ASSEMBLY__ */ |
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#include <asm/reg.h> |
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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_MD_AP, MD_APG_INIT); |
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} |
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static inline void prevent_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_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 = 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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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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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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