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package native
import (
"debug/elf"
"encoding/binary"
"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"
)
// Defined in asm/ptrace.h
const (
_RISCV64_GREGS_SIZE = 32 * 8
_RISCV64_FPREGS_SIZE = (32 * 8) + 4 + 4 // Add 4 bytes to align with 8 due to sys.Iovec uses uint64 as len
)
func ptraceGetGRegs(pid int, regs *linutil.RISCV64PtraceRegs) (err error) {
iov := sys.Iovec{Base: (*byte)(unsafe.Pointer(regs)), Len: _RISCV64_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 ptraceSetGRegs(pid int, regs *linutil.RISCV64PtraceRegs) (err error) {
iov := sys.Iovec{Base: (*byte)(unsafe.Pointer(regs)), Len: _RISCV64_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
}
func ptraceGetFpRegset(tid int, fpregs *linutil.RISCV64PtraceFpRegs) (err error) {
fprBytes := make([]byte, _RISCV64_FPREGS_SIZE)
iov := sys.Iovec{Base: &fprBytes[0], Len: uint64(_RISCV64_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
}
fpregs.Fregs = fprBytes[:iov.Len-8]
fpregs.Fcsr = binary.LittleEndian.Uint32(fprBytes[iov.Len-8 : iov.Len-4])
return
}
func (thread *nativeThread) setPC(pc uint64) error {
ir, err := registers(thread)
if err != nil {
return err
}
r := ir.(*linutil.RISCV64Registers)
r.Regs.Pc = pc
thread.dbp.execPtraceFunc(func() { err = ptraceSetGRegs(thread.ID, r.Regs) })
return err
}
func (thread *nativeThread) setSP(sp uint64) (err error) {
var ir proc.Registers
ir, err = registers(thread)
if err != nil {
return err
}
r := ir.(*linutil.RISCV64Registers)
r.Regs.Sp = sp
thread.dbp.execPtraceFunc(func() { err = ptraceSetGRegs(thread.ID, r.Regs) })
return nil
}
func (thread *nativeThread) SetReg(regNum uint64, reg *op.DwarfRegister) error {
ir, err := registers(thread)
if err != nil {
return err
}
r := ir.(*linutil.RISCV64Registers)
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.RISCV64PtraceRegs
err error
)
thread.dbp.execPtraceFunc(func() { err = ptraceGetGRegs(thread.ID, ®s) })
if err != nil {
return nil, err
}
var tp_tls uint64
if thread.dbp.iscgo {
tp_tls = regs.Tp
}
r := linutil.NewRISCV64Registers(®s, thread.dbp.iscgo, tp_tls,
func(r *linutil.RISCV64Registers) error {
var floatLoadError error
r.Fpregs, r.Fpregset, floatLoadError = thread.fpRegisters()
return floatLoadError
})
return r, nil
}
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