67 lines
1.8 KiB
Go
67 lines
1.8 KiB
Go
// Copyright 2019 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build arm64
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package ring0
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// HaltAndResume halts execution and point the pointer to the resume function.
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//go:nosplit
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func HaltAndResume()
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// HaltEl1SvcAndResume calls Hooks.KernelSyscall and resume.
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//go:nosplit
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func HaltEl1SvcAndResume()
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// init initializes architecture-specific state.
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func (k *Kernel) init(opts KernelOpts) {
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// Save the root page tables.
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k.PageTables = opts.PageTables
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}
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// init initializes architecture-specific state.
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func (c *CPU) init() {
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// Set the kernel stack pointer(virtual address).
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c.registers.Sp = uint64(c.StackTop())
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}
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// StackTop returns the kernel's stack address.
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//
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//go:nosplit
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func (c *CPU) StackTop() uint64 {
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return uint64(kernelAddr(&c.stack[0])) + uint64(len(c.stack))
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}
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// IsCanonical indicates whether addr is canonical per the arm64 spec.
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//
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//go:nosplit
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func IsCanonical(addr uint64) bool {
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return addr <= 0x0000ffffffffffff || addr > 0xffff000000000000
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}
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//go:nosplit
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func (c *CPU) SwitchToUser(switchOpts SwitchOpts) (vector Vector) {
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// Sanitize registers.
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regs := switchOpts.Registers
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regs.Pstate &= ^uint64(UserFlagsClear)
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regs.Pstate |= UserFlagsSet
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kernelExitToEl0()
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vector = c.vecCode
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// Perform the switch.
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return
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}
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