mirror of
https://github.com/Qortal/Brooklyn.git
synced 2025-02-01 07:42:18 +00:00
75 lines
1.6 KiB
C
75 lines
1.6 KiB
C
/* 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) & 0xff000000),
|
|
"Bug: fault blocked by AP register !");
|
|
}
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#endif /* CONFIG_PPC_KUAP */
|
|
|
|
#endif /* _ASM_POWERPC_KUP_8XX_H_ */
|