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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_ASM_UACCESS_H #define __ASM_ASM_UACCESS_H #include <asm/alternative-macros.h> #include <asm/asm-extable.h> #include <asm/assembler.h> #include <asm/kernel-pgtable.h> #include <asm/mmu.h> #include <asm/sysreg.h> /* * User access enabling/disabling macros. */ #ifdef CONFIG_ARM64_SW_TTBR0_PAN .macro __uaccess_ttbr0_disable, tmp1 mrs \tmp1, ttbr1_el1 // swapper_pg_dir bic \tmp1, \tmp1, #TTBR_ASID_MASK sub \tmp1, \tmp1, #RESERVED_SWAPPER_OFFSET // reserved_pg_dir msr ttbr0_el1, \tmp1 // set reserved TTBR0_EL1 add \tmp1, \tmp1, #RESERVED_SWAPPER_OFFSET msr ttbr1_el1, \tmp1 // set reserved ASID isb .endm .macro __uaccess_ttbr0_enable, tmp1, tmp2 get_current_task \tmp1 ldr \tmp1, [\tmp1, #TSK_TI_TTBR0] // load saved TTBR0_EL1 mrs \tmp2, ttbr1_el1 extr \tmp2, \tmp2, \tmp1, #48 ror \tmp2, \tmp2, #16 msr ttbr1_el1, \tmp2 // set the active ASID msr ttbr0_el1, \tmp1 // set the non-PAN TTBR0_EL1 isb .endm .macro uaccess_ttbr0_disable, tmp1, tmp2 alternative_if_not ARM64_HAS_PAN save_and_disable_irq \tmp2 // avoid preemption __uaccess_ttbr0_disable \tmp1 restore_irq \tmp2 alternative_else_nop_endif .endm .macro uaccess_ttbr0_enable, tmp1, tmp2, tmp3 alternative_if_not ARM64_HAS_PAN save_and_disable_irq \tmp3 // avoid preemption __uaccess_ttbr0_enable \tmp1, \tmp2 restore_irq \tmp3 alternative_else_nop_endif .endm #else .macro uaccess_ttbr0_disable, tmp1, tmp2 .endm .macro uaccess_ttbr0_enable, tmp1, tmp2, tmp3 .endm #endif #define USER(l, x...) \ 9999: x; \ _asm_extable_uaccess 9999b, l /* * Generate the assembly for LDTR/STTR with exception table entries. * This is complicated as there is no post-increment or pair versions of the * unprivileged instructions, and USER() only works for single instructions. */ .macro user_ldp l, reg1, reg2, addr, post_inc 8888: ldtr \reg1, [\addr]; 8889: ldtr \reg2, [\addr, #8]; add \addr, \addr, \post_inc; _asm_extable_uaccess 8888b, \l; _asm_extable_uaccess 8889b, \l; .endm .macro user_stp l, reg1, reg2, addr, post_inc 8888: sttr \reg1, [\addr]; 8889: sttr \reg2, [\addr, #8]; add \addr, \addr, \post_inc; _asm_extable_uaccess 8888b,\l; _asm_extable_uaccess 8889b,\l; .endm .macro user_ldst l, inst, reg, addr, post_inc 8888: \inst \reg, [\addr]; add \addr, \addr, \post_inc; _asm_extable_uaccess 8888b, \l; .endm #endif