1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef __ASM_KASAN_H 3*4882a593Smuzhiyun #define __ASM_KASAN_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun #ifndef __ASSEMBLY__ 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #include <linux/linkage.h> 8*4882a593Smuzhiyun #include <asm/memory.h> 9*4882a593Smuzhiyun #include <asm/mte-kasan.h> 10*4882a593Smuzhiyun #include <asm/pgtable-types.h> 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun #define arch_kasan_set_tag(addr, tag) __tag_set(addr, tag) 13*4882a593Smuzhiyun #define arch_kasan_reset_tag(addr) __tag_reset(addr) 14*4882a593Smuzhiyun #define arch_kasan_get_tag(addr) __tag_get(addr) 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun void kasan_init(void); 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun /* 21*4882a593Smuzhiyun * KASAN_SHADOW_START: beginning of the kernel virtual addresses. 22*4882a593Smuzhiyun * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses, 23*4882a593Smuzhiyun * where N = (1 << KASAN_SHADOW_SCALE_SHIFT). 24*4882a593Smuzhiyun * 25*4882a593Smuzhiyun * KASAN_SHADOW_OFFSET: 26*4882a593Smuzhiyun * This value is used to map an address to the corresponding shadow 27*4882a593Smuzhiyun * address by the following formula: 28*4882a593Smuzhiyun * shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET 29*4882a593Smuzhiyun * 30*4882a593Smuzhiyun * (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) shadow addresses that lie in range 31*4882a593Smuzhiyun * [KASAN_SHADOW_OFFSET, KASAN_SHADOW_END) cover all 64-bits of virtual 32*4882a593Smuzhiyun * addresses. So KASAN_SHADOW_OFFSET should satisfy the following equation: 33*4882a593Smuzhiyun * KASAN_SHADOW_OFFSET = KASAN_SHADOW_END - 34*4882a593Smuzhiyun * (1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT)) 35*4882a593Smuzhiyun */ 36*4882a593Smuzhiyun #define _KASAN_SHADOW_START(va) (KASAN_SHADOW_END - (1UL << ((va) - KASAN_SHADOW_SCALE_SHIFT))) 37*4882a593Smuzhiyun #define KASAN_SHADOW_START _KASAN_SHADOW_START(vabits_actual) 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun void kasan_copy_shadow(pgd_t *pgdir); 40*4882a593Smuzhiyun asmlinkage void kasan_early_init(void); 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun #else kasan_init(void)43*4882a593Smuzhiyunstatic inline void kasan_init(void) { } kasan_copy_shadow(pgd_t * pgdir)44*4882a593Smuzhiyunstatic inline void kasan_copy_shadow(pgd_t *pgdir) { } 45*4882a593Smuzhiyun #endif 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun #endif 48*4882a593Smuzhiyun #endif 49