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// syscall_linux.go -- GNU/Linux specific syscall interface.
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package syscall
import "unsafe"
func libc_ptrace(request int, pid Pid_t, addr uintptr, data *byte) _C_long __asm__ ("ptrace")
var dummy *byte
const sizeofPtr uintptr = uintptr(unsafe.Sizeof(dummy))
func ptracePeek(req int, pid int, addr uintptr, out []byte) (count int, errno int) {
// The peek requests are machine-size oriented, so we wrap it
// to retrieve arbitrary-length data.
var buf [sizeofPtr]byte;
// Leading edge. PEEKTEXT/PEEKDATA don't require aligned
// access (PEEKUSER warns that it might), but if we don't
// align our reads, we might straddle an unmapped page
// boundary and not get the bytes leading up to the page
// boundary.
n := 0;
if addr % sizeofPtr != 0 {
SetErrno(0);
val := libc_ptrace(req, Pid_t(pid), addr - addr%sizeofPtr, nil);
if errno := GetErrno(); errno != 0 {
return 0, errno;
}
*(*_C_long)(unsafe.Pointer(&buf[0])) = val;
n += copy(out, buf[addr%sizeofPtr:]);
out = out[n:];
}
// Remainder.
for len(out) > 0 {
// We use an internal buffer to gaurantee alignment.
// It's not documented if this is necessary, but we're paranoid.
SetErrno(0);
val := libc_ptrace(req, Pid_t(pid), addr+uintptr(n), nil);
if errno = GetErrno(); errno != 0 {
return n, errno;
}
*(*_C_long)(unsafe.Pointer(&buf[0])) = val;
copied := copy(out, buf[0:]);
n += copied;
out = out[copied:];
}
return n, 0;
}
func PtracePeekText(pid int, addr uintptr, out []byte) (count int, errno int) {
return ptracePeek(_PTRACE_PEEKTEXT, pid, addr, out);
}
func PtracePeekData(pid int, addr uintptr, out []byte) (count int, errno int) {
return ptracePeek(_PTRACE_PEEKDATA, pid, addr, out);
}
func ptracePoke(pokeReq int, peekReq int, pid int, addr uintptr, data []byte) (count int, errno int) {
// As for ptracePeek, we need to align our accesses to deal
// with the possibility of straddling an invalid page.
// Leading edge.
n := 0;
if addr % sizeofPtr != 0 {
var buf [sizeofPtr]byte;
if libc_ptrace(peekReq, Pid_t(pid), addr - addr%sizeofPtr, &buf[0]) < 0 {
return 0, GetErrno();
}
n += copy(buf[addr%sizeofPtr:], data);
word := (*byte)(unsafe.Pointer(*((*uintptr)(unsafe.Pointer(&buf[0])))));
if libc_ptrace(pokeReq, Pid_t(pid), addr - addr%sizeofPtr, word) < 0 {
return 0, GetErrno();
}
data = data[n:len(data)];
}
// Interior.
for uintptr(len(data)) > sizeofPtr {
word := (*byte)(unsafe.Pointer(*((*uintptr)(unsafe.Pointer(&data[0])))));
if libc_ptrace(pokeReq, Pid_t(pid), addr+uintptr(n), word) < 0 {
return n, GetErrno();
}
n += int(sizeofPtr);
data = data[sizeofPtr:len(data)];
}
// Trailing edge.
if len(data) > 0 {
var buf [sizeofPtr]byte;
if libc_ptrace(peekReq, Pid_t(pid), addr+uintptr(n), &buf[0]) < 0 {
return n, GetErrno();
}
copy(buf[0:], data);
word := (*byte)(unsafe.Pointer(*((*uintptr)(unsafe.Pointer(&buf[0])))));
if libc_ptrace(pokeReq, Pid_t(pid), addr+uintptr(n), word) < 0 {
return n, GetErrno();
}
n += len(data);
}
return n, 0;
}
func PtracePokeText(pid int, addr uintptr, data []byte) (count int, errno int) {
return ptracePoke(_PTRACE_POKETEXT, _PTRACE_PEEKTEXT, pid, addr, data);
}
func PtracePokeData(pid int, addr uintptr, data []byte) (count int, errno int) {
return ptracePoke(_PTRACE_POKEDATA, _PTRACE_PEEKDATA, pid, addr, data);
}
func PtraceGetRegs(pid int, regsout *PtraceRegs) (errno int) {
if libc_ptrace(_PTRACE_GETREGS, Pid_t(pid), 0, (*byte)(unsafe.Pointer(regsout))) < 0 {
return GetErrno();
} else {
return 0;
}
}
func PtraceSetRegs(pid int, regs *PtraceRegs) (errno int) {
if libc_ptrace(_PTRACE_SETREGS, Pid_t(pid), 0, (*byte)(unsafe.Pointer(regs))) < 0 {
return GetErrno();
} else {
return 0;
}
}
func PtraceSetOptions(pid int, options int) (errno int) {
if libc_ptrace(_PTRACE_SETOPTIONS, Pid_t(pid), 0, (*byte)(unsafe.Pointer(uintptr(options)))) < 0 {
return GetErrno();
} else {
return 0;
}
}
func PtraceGetEventMsg(pid int) (msg uint, errno int) {
var data _C_long;
if libc_ptrace(_PTRACE_GETEVENTMSG, Pid_t(pid), 0, (*byte)(unsafe.Pointer(&data))) < 0 {
errno = GetErrno();
}
msg = uint(data);
return;
}
func PtraceCont(pid int, signal int) (errno int) {
if libc_ptrace(_PTRACE_CONT, Pid_t(pid), 0, (*byte)(unsafe.Pointer(uintptr(signal)))) < 0 {
return GetErrno();
} else {
return 0;
}
}
func PtraceSingleStep(pid int) (errno int) {
if libc_ptrace(_PTRACE_SINGLESTEP, Pid_t(pid), 0, nil) < 0 {
return GetErrno();
} else {
return 0;
}
}
func PtraceAttach(pid int) (errno int) {
if libc_ptrace(_PTRACE_ATTACH, Pid_t(pid), 0, nil) < 0 {
return GetErrno();
} else {
return 0;
}
}
func PtraceDetach(pid int) (errno int) {
if libc_ptrace(_PTRACE_DETACH, Pid_t(pid), 0, nil) < 0 {
return GetErrno();
} else {
return 0;
}
}
func Tgkill(tgid int, tid int, sig int) (errno int) {
r1, r2, err := Syscall(SYS_TGKILL, uintptr(tgid), uintptr(tid),
uintptr(sig));
return int(err);
}
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