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Diffstat (limited to 'pkg/ring0/defs_amd64.go')
| -rw-r--r-- | pkg/ring0/defs_amd64.go | 167 |
1 files changed, 0 insertions, 167 deletions
diff --git a/pkg/ring0/defs_amd64.go b/pkg/ring0/defs_amd64.go deleted file mode 100644 index 81e90dbf7..000000000 --- a/pkg/ring0/defs_amd64.go +++ /dev/null @@ -1,167 +0,0 @@ -// Copyright 2018 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. - -//go:build amd64 -// +build amd64 - -package ring0 - -import ( - "gvisor.dev/gvisor/pkg/hostarch" -) - -var ( - // UserspaceSize is the total size of userspace. - UserspaceSize = uintptr(1) << (VirtualAddressBits() - 1) - - // MaximumUserAddress is the largest possible user address. - MaximumUserAddress = (UserspaceSize - 1) & ^uintptr(hostarch.PageSize-1) - - // KernelStartAddress is the starting kernel address. - KernelStartAddress = ^uintptr(0) - (UserspaceSize - 1) -) - -// Segment indices and Selectors. -const ( - // Index into GDT array. - _ = iota // Null descriptor first. - _ // Reserved (Linux is kernel 32). - segKcode // Kernel code (64-bit). - segKdata // Kernel data. - segUcode32 // User code (32-bit). - segUdata // User data. - segUcode64 // User code (64-bit). - segTss // Task segment descriptor. - segTssHi // Upper bits for TSS. - segLast // Last segment (terminal, not included). -) - -// Selectors. -const ( - Kcode Selector = segKcode << 3 - Kdata Selector = segKdata << 3 - Ucode32 Selector = (segUcode32 << 3) | 3 - Udata Selector = (segUdata << 3) | 3 - Ucode64 Selector = (segUcode64 << 3) | 3 - Tss Selector = segTss << 3 -) - -// Standard segments. -var ( - UserCodeSegment32 SegmentDescriptor - UserDataSegment SegmentDescriptor - UserCodeSegment64 SegmentDescriptor - KernelCodeSegment SegmentDescriptor - KernelDataSegment SegmentDescriptor -) - -// KernelArchState contains architecture-specific state. -type KernelArchState struct { - // cpuEntries is array of kernelEntry for all cpus. - cpuEntries []kernelEntry - - // globalIDT is our set of interrupt gates. - globalIDT *idt64 -} - -// kernelEntry contains minimal CPU-specific arch state -// that can be mapped at the upper of the address space. -// Malicious APP might steal info from it via CPU bugs. -type kernelEntry struct { - // stack is the stack used for interrupts on this CPU. - stack [256]byte - - // scratch space for temporary usage. - scratch0 uint64 - - // stackTop is the top of the stack. - stackTop uint64 - - // cpuSelf is back reference to CPU. - cpuSelf *CPU - - // kernelCR3 is the cr3 used for sentry kernel. - kernelCR3 uintptr - - // gdt is the CPU's descriptor table. - gdt descriptorTable - - // tss is the CPU's task state. - tss TaskState64 -} - -// CPUArchState contains CPU-specific arch state. -type CPUArchState struct { - // errorCode is the error code from the last exception. - errorCode uintptr - - // errorType indicates the type of error code here, it is always set - // along with the errorCode value above. - // - // It will either by 1, which indicates a user error, or 0 indicating a - // kernel error. If the error code below returns false (kernel error), - // then it cannot provide relevant information about the last - // exception. - errorType uintptr - - *kernelEntry - - // Copies of global variables, stored in CPU so that they can be used by - // syscall and exception handlers (in the upper address space). - hasXSAVE bool - hasXSAVEOPT bool -} - -// ErrorCode returns the last error code. -// -// The returned boolean indicates whether the error code corresponds to the -// last user error or not. If it does not, then fault information must be -// ignored. This is generally the result of a kernel fault while servicing a -// user fault. -// -//go:nosplit -func (c *CPU) ErrorCode() (value uintptr, user bool) { - return c.errorCode, c.errorType != 0 -} - -// ClearErrorCode resets the error code. -// -//go:nosplit -func (c *CPU) ClearErrorCode() { - c.errorCode = 0 // No code. - c.errorType = 1 // User mode. -} - -// SwitchArchOpts are embedded in SwitchOpts. -type SwitchArchOpts struct { - // UserPCID indicates that the application PCID to be used on switch, - // assuming that PCIDs are supported. - // - // Per pagetables_x86.go, a zero PCID implies a flush. - UserPCID uint16 - - // KernelPCID indicates that the kernel PCID to be used on return, - // assuming that PCIDs are supported. - // - // Per pagetables_x86.go, a zero PCID implies a flush. - KernelPCID uint16 -} - -func init() { - KernelCodeSegment.setCode64(0, 0, 0) - KernelDataSegment.setData(0, 0xffffffff, 0) - UserCodeSegment32.setCode64(0, 0, 3) - UserDataSegment.setData(0, 0xffffffff, 3) - UserCodeSegment64.setCode64(0, 0, 3) -} |