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// Copyright 2019 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build arm64
package kvm
import (
"unsafe"
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
)
// dieArchSetup initialies the state for dieTrampoline.
//
// The arm64 dieTrampoline requires the vCPU to be set in R1, and the last PC
// to be in R0. The trampoline then simulates a call to dieHandler from the
// provided PC.
//
//go:nosplit
func dieArchSetup(c *vCPU, context *arch.SignalContext64, guestRegs *userRegs) {
// If the vCPU is in user mode, we set the stack to the stored stack
// value in the vCPU itself. We don't want to unwind the user stack.
if guestRegs.Regs.Pstate&ring0.PSR_MODE_MASK == ring0.PSR_MODE_EL0t {
regs := c.CPU.Registers()
context.Regs[0] = regs.Regs[0]
context.Sp = regs.Sp
context.Regs[29] = regs.Regs[29] // stack base address
} else {
context.Regs[0] = guestRegs.Regs.Pc
context.Sp = guestRegs.Regs.Sp
context.Regs[29] = guestRegs.Regs.Regs[29]
context.Pstate = guestRegs.Regs.Pstate
}
context.Regs[1] = uint64(uintptr(unsafe.Pointer(c)))
context.Pc = uint64(dieTrampolineAddr)
}
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