/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_ASM_UACCESS_H #define __ASM_ASM_UACCESS_H #include #include #include #include #include /* * 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_TTBR0_SIZE // reserved_ttbr0 just before swapper_pg_dir msr ttbr0_el1, \tmp1 // set reserved TTBR0_EL1 isb add \tmp1, \tmp1, #RESERVED_TTBR0_SIZE 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 isb 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 /* * These macros are no-ops when UAO is present. */ .macro uaccess_disable_not_uao, tmp1, tmp2 uaccess_ttbr0_disable \tmp1, \tmp2 alternative_if ARM64_ALT_PAN_NOT_UAO SET_PSTATE_PAN(1) alternative_else_nop_endif .endm .macro uaccess_enable_not_uao, tmp1, tmp2, tmp3 uaccess_ttbr0_enable \tmp1, \tmp2, \tmp3 alternative_if ARM64_ALT_PAN_NOT_UAO SET_PSTATE_PAN(0) alternative_else_nop_endif .endm #endif