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// Copyright 2020 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package backend
import (
"fmt"
"github.com/google/syzkaller/sys/targets"
)
func PreviousInstructionPC(target *targets.Target, vm string, pc uint64) uint64 {
if vm == targets.GVisor {
// gVisor coverage returns real PCs that don't need adjustment.
return pc
}
offset := instructionLen(target.Arch)
pc -= offset
// THUMB instructions are 2 or 4 bytes with low bit set.
// ARM instructions are always 4 bytes.
if target.Arch == targets.ARM {
return pc & ^uint64(1)
}
return pc
}
func NextInstructionPC(target *targets.Target, vm string, pc uint64) uint64 {
if vm == targets.GVisor {
return pc
}
offset := instructionLen(target.Arch)
pc += offset
// THUMB instructions are 2 or 4 bytes with low bit set.
// ARM instructions are always 4 bytes.
if target.Arch == targets.ARM {
return pc & ^uint64(1)
}
return pc
}
func instructionLen(arch string) uint64 {
switch arch {
case targets.AMD64:
return 5
case targets.I386:
return 5
case targets.ARM64:
return 4
case targets.ARM:
return 3
case targets.PPC64LE:
return 4
case targets.MIPS64LE:
return 8
case targets.S390x:
return 6
case targets.RiscV64:
return 4
case targets.TestArch64:
return 0
default:
panic(fmt.Sprintf("unknown arch %q", arch))
}
}
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