86 lines
1.8 KiB
Go
86 lines
1.8 KiB
Go
package sbpf
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import (
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"errors"
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"fmt"
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)
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// VM is the virtual machine abstraction, implemented by each executor.
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type VM interface {
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VMContext() any
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Read(addr uint64, p []byte) error
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Read8(addr uint64) (uint8, error)
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Read16(addr uint64) (uint16, error)
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Read32(addr uint64) (uint32, error)
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Read64(addr uint64) (uint64, error)
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Write(addr uint64, p []byte) error
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Write8(addr uint64, x uint8) error
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Write16(addr uint64, x uint16) error
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Write32(addr uint64, x uint32) error
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Write64(addr uint64, x uint64) error
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}
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// VMOpts specifies virtual machine parameters.
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type VMOpts struct {
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// Machine parameters
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HeapSize int
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Syscalls SyscallRegistry
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Tracer TraceSink
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// Execution parameters
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Context any // passed to syscalls
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MaxCU int
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Input []byte // mapped at VaddrInput
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}
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type Exception struct {
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PC int64
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Detail error
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}
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func (e *Exception) Error() string {
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return fmt.Sprintf("exception at %d: %s", e.PC, e.Detail)
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}
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func (e *Exception) Unwrap() error {
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return e.Detail
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}
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// Exception codes.
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var (
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ExcDivideByZero = errors.New("division by zero")
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ExcDivideOverflow = errors.New("divide overflow")
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ExcOutOfCU = errors.New("compute unit overrun")
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ExcCallDepth = errors.New("call depth exceeded")
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)
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type ExcBadAccess struct {
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Addr uint64
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Size uint32
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Write bool
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Reason string
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}
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func NewExcBadAccess(addr uint64, size uint32, write bool, reason string) ExcBadAccess {
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return ExcBadAccess{
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Addr: addr,
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Size: size,
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Write: write,
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Reason: reason,
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}
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}
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func (e ExcBadAccess) Error() string {
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return fmt.Sprintf("bad memory access at %#x (size=%d write=%v), reason: %s", e.Addr, e.Size, e.Write, e.Reason)
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}
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type ExcCallDest struct {
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Imm uint32
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}
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func (e ExcCallDest) Error() string {
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return fmt.Sprintf("unknown symbol or syscall 0x%08x", e.Imm)
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}
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