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90 lines
2.2 KiB
90 lines
2.2 KiB
/* 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-macros.h> |
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#include <asm/kernel-pgtable.h> |
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#include <asm/mmu.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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bic \tmp1, \tmp1, #TTBR_ASID_MASK |
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sub \tmp1, \tmp1, #RESERVED_SWAPPER_OFFSET // reserved_pg_dir |
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msr ttbr0_el1, \tmp1 // set reserved TTBR0_EL1 |
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isb |
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add \tmp1, \tmp1, #RESERVED_SWAPPER_OFFSET |
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msr ttbr1_el1, \tmp1 // set reserved ASID |
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isb |
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.endm |
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.macro __uaccess_ttbr0_enable, tmp1, tmp2 |
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get_current_task \tmp1 |
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ldr \tmp1, [\tmp1, #TSK_TI_TTBR0] // load saved TTBR0_EL1 |
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mrs \tmp2, ttbr1_el1 |
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extr \tmp2, \tmp2, \tmp1, #48 |
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ror \tmp2, \tmp2, #16 |
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msr ttbr1_el1, \tmp2 // set the active ASID |
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isb |
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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, 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_disable \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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.macro uaccess_ttbr0_enable, tmp1, tmp2, tmp3 |
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alternative_if_not ARM64_HAS_PAN |
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save_and_disable_irq \tmp3 // avoid preemption |
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__uaccess_ttbr0_enable \tmp1, \tmp2 |
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restore_irq \tmp3 |
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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, tmp2 |
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.endm |
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.macro uaccess_ttbr0_enable, tmp1, tmp2, tmp3 |
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.endm |
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#endif |
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/* |
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* Generate the assembly for LDTR/STTR with exception table entries. |
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* This is complicated as there is no post-increment or pair versions of the |
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* unprivileged instructions, and USER() only works for single instructions. |
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*/ |
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.macro user_ldp l, reg1, reg2, addr, post_inc |
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8888: ldtr \reg1, [\addr]; |
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8889: ldtr \reg2, [\addr, #8]; |
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add \addr, \addr, \post_inc; |
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_asm_extable 8888b,\l; |
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_asm_extable 8889b,\l; |
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.endm |
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.macro user_stp l, reg1, reg2, addr, post_inc |
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8888: sttr \reg1, [\addr]; |
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8889: sttr \reg2, [\addr, #8]; |
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add \addr, \addr, \post_inc; |
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_asm_extable 8888b,\l; |
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_asm_extable 8889b,\l; |
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.endm |
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.macro user_ldst l, inst, reg, addr, post_inc |
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8888: \inst \reg, [\addr]; |
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add \addr, \addr, \post_inc; |
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_asm_extable 8888b,\l; |
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.endm |
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#endif
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