mirror of
https://github.com/go-delve/delve.git
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2925c0310a
Implements the function call injection protocol introduced in go 1.11 by https://go-review.googlesource.com/c/go/+/109699. This is only the basic support, see TODO comments in pkg/proc/fncall.go for a list of missing features. Updates #119
84 lines
2.6 KiB
Go
84 lines
2.6 KiB
Go
package native
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import (
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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/derekparker/delve/pkg/proc"
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)
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// PtraceAttach executes the sys.PtraceAttach call.
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func PtraceAttach(pid int) error {
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return sys.PtraceAttach(pid)
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}
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// PtraceDetach calls ptrace(PTRACE_DETACH).
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func PtraceDetach(tid, sig int) error {
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_, _, err := sys.Syscall6(sys.SYS_PTRACE, sys.PTRACE_DETACH, uintptr(tid), 1, uintptr(sig), 0, 0)
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if err != syscall.Errno(0) {
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return err
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}
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return nil
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}
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// PtraceCont executes ptrace PTRACE_CONT
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func PtraceCont(tid, sig int) error {
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return sys.PtraceCont(tid, sig)
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}
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// PtraceSingleStep executes ptrace PTRACE_SINGLE_STEP.
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func PtraceSingleStep(tid int) error {
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return sys.PtraceSingleStep(tid)
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}
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// PtracePokeUser execute ptrace PTRACE_POKE_USER.
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func PtracePokeUser(tid int, off, addr uintptr) error {
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_, _, err := sys.Syscall6(sys.SYS_PTRACE, sys.PTRACE_POKEUSR, uintptr(tid), uintptr(off), uintptr(addr), 0, 0)
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if err != syscall.Errno(0) {
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return err
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}
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return nil
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}
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// PtracePeekUser execute ptrace PTRACE_PEEK_USER.
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func PtracePeekUser(tid int, off uintptr) (uintptr, error) {
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var val uintptr
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_, _, err := syscall.Syscall6(syscall.SYS_PTRACE, syscall.PTRACE_PEEKUSR, uintptr(tid), uintptr(off), uintptr(unsafe.Pointer(&val)), 0, 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 val, nil
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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 amd64_linux_fetch_inferior_registers in gdb/amd64-linux-nat.c.html
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// and amd64_supply_xsave in gdb/amd64-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 proc.LinuxX86Xstate, err error) {
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_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETFPREGS, uintptr(tid), uintptr(0), uintptr(unsafe.Pointer(®set.PtraceFpRegs)), 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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var xstateargs [_X86_XSTATE_MAX_SIZE]byte
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iov := sys.Iovec{Base: &xstateargs[0], Len: _X86_XSTATE_MAX_SIZE}
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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 {
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// ignore ENODEV, it just means this CPU or kernel doesn't support XSTATE, see https://github.com/derekparker/delve/issues/1022
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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 = proc.LinuxX86XstateRead(regset.Xsave, false, ®set)
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return regset, err
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}
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