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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.
//go:build amd64
// +build amd64
package kernel
import (
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/errors/linuxerr"
"gvisor.dev/gvisor/pkg/hostarch"
"gvisor.dev/gvisor/pkg/usermem"
)
// ptraceArch implements arch-specific ptrace commands.
func (t *Task) ptraceArch(target *Task, req int64, addr, data hostarch.Addr) error {
switch req {
case linux.PTRACE_PEEKUSR: // aka PTRACE_PEEKUSER
n, err := target.Arch().PtracePeekUser(uintptr(addr))
if err != nil {
return err
}
_, err = n.CopyOut(t, data)
return err
case linux.PTRACE_POKEUSR: // aka PTRACE_POKEUSER
return target.Arch().PtracePokeUser(uintptr(addr), uintptr(data))
case linux.PTRACE_GETREGS:
// "Copy the tracee's general-purpose ... registers ... to the address
// data in the tracer. ... (addr is ignored.) Note that SPARC systems
// have the meaning of data and addr reversed ..."
_, err := target.Arch().PtraceGetRegs(&usermem.IOReadWriter{
Ctx: t,
IO: t.MemoryManager(),
Addr: data,
Opts: usermem.IOOpts{
AddressSpaceActive: true,
},
})
return err
case linux.PTRACE_GETFPREGS:
s := target.Arch().FloatingPointData()
_, err := target.Arch().FloatingPointData().PtraceGetFPRegs(&usermem.IOReadWriter{
Ctx: t,
IO: t.MemoryManager(),
Addr: data,
Opts: usermem.IOOpts{
AddressSpaceActive: true,
},
}, len(*s))
return err
case linux.PTRACE_SETREGS:
_, err := target.Arch().PtraceSetRegs(&usermem.IOReadWriter{
Ctx: t,
IO: t.MemoryManager(),
Addr: data,
Opts: usermem.IOOpts{
AddressSpaceActive: true,
},
})
return err
case linux.PTRACE_SETFPREGS:
s := target.Arch().FloatingPointData()
_, err := s.PtraceSetFPRegs(&usermem.IOReadWriter{
Ctx: t,
IO: t.MemoryManager(),
Addr: data,
Opts: usermem.IOOpts{
AddressSpaceActive: true,
},
}, len(*s))
return err
default:
return linuxerr.EIO
}
}
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