76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_ASM_UACCESS_H
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#define __ASM_ASM_UACCESS_H
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#include <asm/alternative.h>
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#include <asm/kernel-pgtable.h>
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#include <asm/sysreg.h>
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#include <asm/assembler.h>
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/*
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* User access enabling/disabling macros.
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*/
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#ifdef CONFIG_ARM64_SW_TTBR0_PAN
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.macro __uaccess_ttbr0_disable, tmp1
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mrs \tmp1, ttbr1_el1 // swapper_pg_dir
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add \tmp1, \tmp1, #SWAPPER_DIR_SIZE // reserved_ttbr0 at the end of swapper_pg_dir
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msr ttbr0_el1, \tmp1 // set reserved TTBR0_EL1
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isb
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.endm
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.macro __uaccess_ttbr0_enable, tmp1
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get_thread_info \tmp1
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ldr \tmp1, [\tmp1, #TSK_TI_TTBR0] // load saved TTBR0_EL1
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msr ttbr0_el1, \tmp1 // set the non-PAN TTBR0_EL1
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isb
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.endm
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.macro uaccess_ttbr0_disable, tmp1
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alternative_if_not ARM64_HAS_PAN
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__uaccess_ttbr0_disable \tmp1
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alternative_else_nop_endif
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.endm
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.macro uaccess_ttbr0_enable, tmp1, tmp2
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alternative_if_not ARM64_HAS_PAN
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save_and_disable_irq \tmp2 // avoid preemption
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__uaccess_ttbr0_enable \tmp1
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restore_irq \tmp2
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alternative_else_nop_endif
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.endm
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#else
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.macro uaccess_ttbr0_disable, tmp1
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.endm
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.macro uaccess_ttbr0_enable, tmp1, tmp2
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.endm
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#endif
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/*
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* These macros are no-ops when UAO is present.
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*/
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.macro uaccess_disable_not_uao, tmp1
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uaccess_ttbr0_disable \tmp1
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alternative_if ARM64_ALT_PAN_NOT_UAO
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SET_PSTATE_PAN(1)
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alternative_else_nop_endif
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.endm
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.macro uaccess_enable_not_uao, tmp1, tmp2
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uaccess_ttbr0_enable \tmp1, \tmp2
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alternative_if ARM64_ALT_PAN_NOT_UAO
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SET_PSTATE_PAN(0)
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alternative_else_nop_endif
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.endm
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/*
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* Remove the address tag from a virtual address, if present.
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*/
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.macro clear_address_tag, dst, addr
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tst \addr, #(1 << 55)
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bic \dst, \addr, #(0xff << 56)
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csel \dst, \dst, \addr, eq
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.endm
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#endif
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