mirror of
https://github.com/darlinghq/darling-xnu.git
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144 lines
4.6 KiB
C
144 lines
4.6 KiB
C
/*
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* Copyright (c) 2019 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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#ifndef _ARM64_PAC_ASM_H_
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#define _ARM64_PAC_ASM_H_
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#ifndef __ASSEMBLER__
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#error "This header should only be used in .s files"
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#endif
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#include <pexpert/arm64/board_config.h>
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#include <arm64/proc_reg.h>
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#if HAS_PARAVIRTUALIZED_PAC
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#include "smccc_asm.h"
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#endif
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#include "assym.s"
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#if defined(HAS_APPLE_PAC)
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/* BEGIN IGNORE CODESTYLE */
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/**
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* REPROGRAM_JOP_KEYS
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*
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* Loads a userspace process's JOP key (task->jop_pid) into the CPU, and
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* updates current_cpu_datap()->jop_key accordingly. This reprogramming process
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* is skipped whenever the "new" JOP key has already been loaded into the CPU.
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*
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* skip_label - branch to this label if new_jop_key is already loaded into CPU
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* new_jop_key - process's jop_pid
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* cpudatap - current cpu_data_t *
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* tmp - scratch register
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*/
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.macro REPROGRAM_JOP_KEYS skip_label, new_jop_key, cpudatap, tmp
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ldr \tmp, [\cpudatap, CPU_JOP_KEY]
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cmp \new_jop_key, \tmp
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b.eq \skip_label
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SET_JOP_KEY_REGISTERS \new_jop_key, \tmp
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str \new_jop_key, [\cpudatap, CPU_JOP_KEY]
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.endmacro
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/**
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* REPROGRAM_ROP_KEYS
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*
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* Loads a userspace process's ROP key (task->rop_pid) into the CPU, and
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* updates current_cpu_datap()->rop_key accordingly. This reprogramming process
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* is skipped whenever the "new" ROP key has already been loaded into the CPU.
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*
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* skip_label - branch to this label if new_rop_key is already loaded into CPU
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* new_rop_key - process's rop_pid
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* cpudatap - current cpu_data_t *
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* tmp - scratch register
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*/
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.macro REPROGRAM_ROP_KEYS skip_label, new_rop_key, cpudatap, tmp
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ldr \tmp, [\cpudatap, CPU_ROP_KEY]
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cmp \new_rop_key, \tmp
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b.eq \skip_label
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SET_ROP_KEY_REGISTERS \new_rop_key, \tmp
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str \new_rop_key, [\cpudatap, CPU_ROP_KEY]
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.endmacro
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/**
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* SET_JOP_KEY_REGISTERS
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*
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* Unconditionally loads a userspace process's JOP key (task->jop_pid) into the
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* CPU. The caller is responsible for updating current_cpu_datap()->jop_key as
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* needed.
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*
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* new_jop_key - process's jop_pid
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* tmp - scratch register
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*/
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.macro SET_JOP_KEY_REGISTERS new_jop_key, tmp
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#if HAS_PARAVIRTUALIZED_PAC
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SAVE_SMCCC_CLOBBERED_REGISTERS
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/*
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* We're deliberately calling PAC_SET_EL0_DIVERSIFIER here, even though the
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* EL0 diversifier affects both A (JOP) and B (ROP) keys. We don't want
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* SET_JOP_KEY_REGISTERS to have an impact on the EL1 A key state, since
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* these are the keys the kernel uses to sign pointers on the heap.
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*
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* Using new_jop_key as the EL0 diversifer has the same net effect of giving
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* userspace its own set of JOP keys, but doesn't affect EL1 A key state.
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*/
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MOV64 x0, VMAPPLE_PAC_SET_EL0_DIVERSIFIER
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mov x1, \new_jop_key
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hvc #0
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LOAD_SMCCC_CLOBBERED_REGISTERS
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#endif /* HAS_PARAVIRTUALIZED_PAC */
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.endmacro
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/**
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* SET_ROP_KEY_REGISTERS
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*
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* Unconditionally loads a userspace process's ROP key (task->rop_pid) into the
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* CPU. The caller is responsible for updating current_cpu_datap()->rop_key as
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* needed.
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*
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* new_rop_key - process's rop_pid
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* tmp - scratch register
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*/
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.macro SET_ROP_KEY_REGISTERS new_rop_key, tmp
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#if HAS_PARAVIRTUALIZED_PAC
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SAVE_SMCCC_CLOBBERED_REGISTERS
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MOV64 x0, VMAPPLE_PAC_SET_B_KEYS
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mov x1, \new_rop_key
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hvc #0
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LOAD_SMCCC_CLOBBERED_REGISTERS
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#endif /* HAS_PARAVIRTUALIZED_PAC */
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.endmacro
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/* END IGNORE CODESTYLE */
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#endif /* defined(HAS_APPLE_PAC) */
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#endif /* _ARM64_PAC_ASM_H_ */
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/* vim: set ts=4 ft=asm: */
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