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package native
import (
"debug/elf"
"syscall"
"unsafe"
sys "golang.org/x/sys/unix"
"github.com/go-delve/delve/pkg/dwarf/op"
"github.com/go-delve/delve/pkg/proc"
"github.com/go-delve/delve/pkg/proc/linutil"
)
const (
_AARCH64_GREGS_SIZE = 34 * 8
_AARCH64_FPREGS_SIZE = 32*16 + 8
_NT_ARM_TLS = 0x401 // used in PTRACE_GETREGSET on ARM64 to retrieve the value of TPIDR_EL0, see source/include/uapi/linux/elf.h and source/arch/arm64/kernel/ptrace.c
)
func ptraceGetGRegs(pid int, regs *linutil.ARM64PtraceRegs) (err error) {
iov := sys.Iovec{Base: (*byte)(unsafe.Pointer(regs)), Len: _AARCH64_GREGS_SIZE}
_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETREGSET, uintptr(pid), uintptr(elf.NT_PRSTATUS), uintptr(unsafe.Pointer(&iov)), 0, 0)
if err == syscall.Errno(0) {
err = nil
}
return
}
func ptraceGetTpidr_el0(pid int, tpidr_el0 *uint64) (err error) {
iov := sys.Iovec{Base: (*byte)(unsafe.Pointer(tpidr_el0)), Len: uint64(unsafe.Sizeof(*tpidr_el0))}
_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETREGSET, uintptr(pid), uintptr(_NT_ARM_TLS), uintptr(unsafe.Pointer(&iov)), 0, 0)
if err == syscall.Errno(0) {
err = nil
}
return
}
func ptraceSetGRegs(pid int, regs *linutil.ARM64PtraceRegs) (err error) {
iov := sys.Iovec{Base: (*byte)(unsafe.Pointer(regs)), Len: _AARCH64_GREGS_SIZE}
_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_SETREGSET, uintptr(pid), uintptr(elf.NT_PRSTATUS), uintptr(unsafe.Pointer(&iov)), 0, 0)
if err == syscall.Errno(0) {
err = nil
}
return
}
// ptraceGetFpRegset returns floating point registers of the specified thread
// using PTRACE.
func ptraceGetFpRegset(tid int) (fpregset []byte, err error) {
var arm64_fpregs [_AARCH64_FPREGS_SIZE]byte
iov := sys.Iovec{Base: &arm64_fpregs[0], Len: _AARCH64_FPREGS_SIZE}
_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETREGSET, uintptr(tid), uintptr(elf.NT_FPREGSET), uintptr(unsafe.Pointer(&iov)), 0, 0)
if err != syscall.Errno(0) {
if err == syscall.ENODEV {
err = nil
}
return
} else {
err = nil
}
fpregset = arm64_fpregs[:iov.Len-8]
return fpregset, err
}
// setPC sets PC to the value specified by 'pc'.
func (thread *nativeThread) setPC(pc uint64) error {
ir, err := registers(thread)
if err != nil {
return err
}
r := ir.(*linutil.ARM64Registers)
r.Regs.Pc = pc
thread.dbp.execPtraceFunc(func() { err = ptraceSetGRegs(thread.ID, r.Regs) })
return err
}
func (thread *nativeThread) SetReg(regNum uint64, reg *op.DwarfRegister) error {
ir, err := registers(thread)
if err != nil {
return err
}
r := ir.(*linutil.ARM64Registers)
fpchanged, err := r.SetReg(regNum, reg)
if err != nil {
return err
}
thread.dbp.execPtraceFunc(func() {
err = ptraceSetGRegs(thread.ID, r.Regs)
if err != syscall.Errno(0) && err != nil {
return
}
if fpchanged && r.Fpregset != nil {
iov := sys.Iovec{Base: &r.Fpregset[0], Len: uint64(len(r.Fpregset))}
_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_SETREGSET, uintptr(thread.ID), uintptr(elf.NT_FPREGSET), uintptr(unsafe.Pointer(&iov)), 0, 0)
}
})
if err == syscall.Errno(0) {
err = nil
}
return err
}
func registers(thread *nativeThread) (proc.Registers, error) {
var (
regs linutil.ARM64PtraceRegs
err error
)
thread.dbp.execPtraceFunc(func() { err = ptraceGetGRegs(thread.ID, ®s) })
if err != nil {
return nil, err
}
var tpidr_el0 uint64
if thread.dbp.iscgo {
thread.dbp.execPtraceFunc(func() { err = ptraceGetTpidr_el0(thread.ID, &tpidr_el0) })
if err != nil {
return nil, err
}
}
r := linutil.NewARM64Registers(®s, thread.dbp.iscgo, tpidr_el0, func(r *linutil.ARM64Registers) error {
var floatLoadError error
r.Fpregs, r.Fpregset, floatLoadError = thread.fpRegisters()
return floatLoadError
})
return r, nil
}
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