mirror of
https://github.com/go-delve/delve.git
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94 lines
3.5 KiB
Go
94 lines
3.5 KiB
Go
package native
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import (
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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/amd64util"
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)
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// ptraceGetRegset returns floating point registers of the specified thread
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// using PTRACE.
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// See i386_linux_fetch_inferior_registers in gdb/i386-linux-nat.c.html
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// and i386_supply_xsave in gdb/i386-tdep.c.html
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// and Section 13.1 (and following) of Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 1: Basic Architecture
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func ptraceGetRegset(tid int) (regset amd64util.AMD64Xstate, err error) {
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_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETFPREGS, uintptr(tid), uintptr(0), uintptr(unsafe.Pointer(®set.AMD64PtraceFpRegs)), 0, 0)
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if err == syscall.Errno(0) || err == syscall.ENODEV {
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// ignore ENODEV, it just means this CPU doesn't have X87 registers (??)
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err = nil
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}
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xstateargs := make([]byte, amd64util.AMD64XstateMaxSize())
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iov := sys.Iovec{Base: &xstateargs[0], Len: uint32(len(xstateargs))}
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_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETREGSET, uintptr(tid), _NT_X86_XSTATE, uintptr(unsafe.Pointer(&iov)), 0, 0)
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if err != syscall.Errno(0) {
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if err == syscall.ENODEV || err == syscall.EIO || err == syscall.EINVAL {
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// ignore ENODEV, it just means this CPU or kernel doesn't support XSTATE, see https://github.com/go-delve/delve/issues/1022
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// also ignore EIO, it means that we are running on an old kernel (pre 2.6.34) and PTRACE_GETREGSET is not implemented
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// also ignore EINVAL, it means the kernel itself does not support the NT_X86_XSTATE argument (but does support PTRACE_GETREGSET)
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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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regset.Xsave = xstateargs[:iov.Len]
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err = amd64util.AMD64XstateRead(regset.Xsave, false, ®set)
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return
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}
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// ptraceGetTls return the addr of tls by PTRACE_GET_THREAD_AREA for specify thread.
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// See http://man7.org/linux/man-pages/man2/ptrace.2.html for detail about PTRACE_GET_THREAD_AREA.
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// struct user_desc at https://golang.org/src/runtime/sys_linux_386.s
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//
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// type UserDesc struct {
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// EntryNumber uint32
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// BaseAddr uint32
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// Limit uint32
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// Flag uint32
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// }
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func ptraceGetTls(gs int32, tid int) (uint32, error) {
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ud := [4]uint32{}
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// Gs usually is 0x33
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_, _, err := syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GET_THREAD_AREA, uintptr(tid), uintptr(gs>>3), uintptr(unsafe.Pointer(&ud)), 0, 0)
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if err == syscall.ENODEV || err == syscall.EIO {
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return 0, fmt.Errorf("%s", err)
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}
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return uint32(ud[1]), nil
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}
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// processVmRead calls process_vm_readv
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func processVmRead(tid int, addr uintptr, data []byte) (int, error) {
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len_iov := uint32(len(data))
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local_iov := sys.Iovec{Base: &data[0], Len: len_iov}
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remote_iov := remoteIovec{base: addr, len: uintptr(len_iov)}
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p_local := uintptr(unsafe.Pointer(&local_iov))
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p_remote := uintptr(unsafe.Pointer(&remote_iov))
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n, _, err := syscall.Syscall6(sys.SYS_PROCESS_VM_READV, uintptr(tid), p_local, 1, p_remote, 1, 0)
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if err != syscall.Errno(0) {
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return 0, err
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}
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return int(n), nil
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}
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// processVmWrite calls process_vm_writev
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func processVmWrite(tid int, addr uintptr, data []byte) (int, error) {
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len_iov := uint32(len(data))
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local_iov := sys.Iovec{Base: &data[0], Len: len_iov}
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remote_iov := remoteIovec{base: addr, len: uintptr(len_iov)}
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p_local := uintptr(unsafe.Pointer(&local_iov))
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p_remote := uintptr(unsafe.Pointer(&remote_iov))
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n, _, err := syscall.Syscall6(sys.SYS_PROCESS_VM_WRITEV, uintptr(tid), p_local, 1, p_remote, 1, 0)
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if err != syscall.Errno(0) {
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return 0, err
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}
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return int(n), nil
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}
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