104 lines
2.7 KiB
Go
104 lines
2.7 KiB
Go
package native
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import (
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"debug/elf"
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"fmt"
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"syscall"
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"unsafe"
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sys "golang.org/x/sys/unix"
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"github.com/go-delve/delve/pkg/proc"
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"github.com/go-delve/delve/pkg/proc/linutil"
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)
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const (
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AARCH64_GREGS_SIZE = 34 * 8
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AARCH64_FPREGS_SIZE = 32*16 + 8
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)
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func ptraceGetGRegs(pid int, regs *linutil.ARM64PtraceRegs) (err error) {
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iov := sys.Iovec{Base: (*byte)(unsafe.Pointer(regs)), Len: AARCH64_GREGS_SIZE}
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_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETREGSET, uintptr(pid), uintptr(elf.NT_PRSTATUS), uintptr(unsafe.Pointer(&iov)), 0, 0)
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if err == syscall.Errno(0) {
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err = nil
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}
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return
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}
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func ptraceSetGRegs(pid int, regs *linutil.ARM64PtraceRegs) (err error) {
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iov := sys.Iovec{Base: (*byte)(unsafe.Pointer(regs)), Len: AARCH64_GREGS_SIZE}
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_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_SETREGSET, uintptr(pid), uintptr(elf.NT_PRSTATUS), uintptr(unsafe.Pointer(&iov)), 0, 0)
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if err == syscall.Errno(0) {
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err = nil
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}
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return
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}
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// PtraceGetFpRegset returns floating point registers of the specified thread
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// using PTRACE.
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func PtraceGetFpRegset(tid int) (fpregset []byte, err error) {
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var arm64_fpregs [AARCH64_FPREGS_SIZE]byte
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iov := sys.Iovec{Base: &arm64_fpregs[0], Len: AARCH64_FPREGS_SIZE}
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_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETREGSET, uintptr(tid), uintptr(elf.NT_FPREGSET), uintptr(unsafe.Pointer(&iov)), 0, 0)
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if err != syscall.Errno(0) {
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if err == syscall.ENODEV {
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err = nil
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}
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return
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} else {
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err = nil
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}
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fpregset = arm64_fpregs[:iov.Len-8]
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return fpregset, err
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}
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// SetPC sets PC to the value specified by 'pc'.
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func (thread *Thread) SetPC(pc uint64) error {
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ir, err := registers(thread, false)
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if err != nil {
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return err
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}
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r := ir.(*linutil.ARM64Registers)
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r.Regs.Pc = pc
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thread.dbp.execPtraceFunc(func() { err = ptraceSetGRegs(thread.ID, r.Regs) })
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return err
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}
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// SetSP sets RSP to the value specified by 'sp'
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func (thread *Thread) SetSP(sp uint64) (err error) {
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var ir proc.Registers
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ir, err = registers(thread, false)
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if err != nil {
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return err
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}
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r := ir.(*linutil.ARM64Registers)
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r.Regs.Sp = sp
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thread.dbp.execPtraceFunc(func() { err = ptraceSetGRegs(thread.ID, r.Regs) })
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return
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}
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func (thread *Thread) SetDX(dx uint64) (err error) {
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return fmt.Errorf("not supported")
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}
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func registers(thread *Thread, floatingPoint bool) (proc.Registers, error) {
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var (
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regs linutil.ARM64PtraceRegs
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err error
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)
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thread.dbp.execPtraceFunc(func() { err = ptraceGetGRegs(thread.ID, ®s) })
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if err != nil {
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return nil, err
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}
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r := &linutil.ARM64Registers{®s, nil, nil}
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if floatingPoint {
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r.Fpregs, r.Fpregset, err = thread.fpRegisters()
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if err != nil {
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return nil, err
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}
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}
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return r, nil
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}
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