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Introduce new ptrace(2) interface: PT_SET_SIGINFO and PT_GET_SIGINFO

This interface is designed to read signal information emited to tracee and
fake this signal with new value.

This functionality is required to distinguish types of events that occured
in the tracee and intercepted by a debugger.

These accessors introduce a new structure type ptrace_siginfo:
/*
 * Signal Information structure
 */
typedef struct ptrace_siginfo {
       siginfo_t       psi_siginfo;    /* signal information structure */
       lwpid_t         psi_lwpid;      /* destination LWP of the signal
                                        * value 0 means the whole process
                                        * (route signal to all LWPs) */
} ptrace_siginfo_t;

Include <sys/siginfo.h> in <sys/ptrace.h> in order to not break existing
software due to unknown symbol siginfo_t.

This interface has been proposed to the tech-kern@ mailing list.

Sponsored by <The NetBSD Foundation>

/*	$NetBSD: core_netbsd.c,v 1.23 2017/01/06 22:53:17 kamil Exp $	*/

/*
 * Copyright (c) 1997 Charles D. Cranor and Washington University.
 * Copyright (c) 1991, 1993 The Regents of the University of California.
 * Copyright (c) 1988 University of Utah.
 *
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
 *      @(#)vm_unix.c   8.1 (Berkeley) 6/11/93
 * from: NetBSD: uvm_unix.c,v 1.25 2001/11/10 07:37:01 lukem Exp
 */

/*
 * core_netbsd.c: Support for the historic NetBSD core file format.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: core_netbsd.c,v 1.23 2017/01/06 22:53:17 kamil Exp $");

#ifdef _KERNEL_OPT
#include "opt_coredump.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/exec.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/core.h>

#include <uvm/uvm_extern.h>

#ifndef CORENAME
#define	CORENAME(x)	x
#endif
#ifdef COREINC
#include COREINC
#endif

#ifdef COREDUMP

struct coredump_state {
	struct coredump_iostate *iocookie;
	struct CORENAME(core) core;
};

static int	CORENAME(coredump_writesegs_netbsd)(struct uvm_coredump_state *);

int
CORENAME(coredump_netbsd)(struct lwp *l, struct coredump_iostate *iocookie)
{
	struct coredump_state cs;
	struct proc *p = l->l_proc;
	struct vmspace *vm = p->p_vmspace;
	int error;

	cs.iocookie = iocookie;
	cs.core.c_midmag = 0;
	strncpy(cs.core.c_name, p->p_comm, MAXCOMLEN);
	cs.core.c_nseg = 0;
	cs.core.c_signo = p->p_sigctx.ps_info._signo;
	cs.core.c_ucode = p->p_sigctx.ps_info._code;
	cs.core.c_cpusize = 0;
	cs.core.c_tsize = (u_long)ctob(vm->vm_tsize);
	cs.core.c_dsize = (u_long)ctob(vm->vm_dsize);
	cs.core.c_ssize = (u_long)round_page(ctob(vm->vm_ssize));

	error = CORENAME(cpu_coredump)(l, NULL, &cs.core);
	if (error)
		return (error);
	cs.core.c_nseg = uvm_coredump_count_segs(p);

	/* First write out the core header. */
	error = coredump_write(iocookie, UIO_SYSSPACE, &cs.core,
	    cs.core.c_hdrsize);
	if (error)
		return (error);

	/* Then the CPU specific stuff */
	error = CORENAME(cpu_coredump)(l, iocookie, &cs.core);
	if (error)
		return (error);

	/* Finally, the address space dump */
	return uvm_coredump_walkmap(p, CORENAME(coredump_writesegs_netbsd),
	    &cs);
}

static int
CORENAME(coredump_writesegs_netbsd)(struct uvm_coredump_state *us)
{
	struct coredump_state *cs = us->cookie;
	struct CORENAME(coreseg) cseg;
	int flag, error;

	if (us->flags & UVM_COREDUMP_STACK)
		flag = CORE_STACK;
	else
		flag = CORE_DATA;

	/*
	 * Set up a new core file segment.
	 */
	CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(cs->core), flag);
	cseg.c_addr = us->start;

	if (us->start == us->realend)
		/* Not really wanted, but counted... */
		cseg.c_size = 0;
	else
		cseg.c_size = us->end - us->start;

	error = coredump_write(cs->iocookie, UIO_SYSSPACE,
	    &cseg, cs->core.c_seghdrsize);
	if (error)
		return (error);

	return coredump_write(cs->iocookie, UIO_USERSPACE,
	    (void *)(vaddr_t)us->start, cseg.c_size);
}

#else	/* COREDUMP */

int
CORENAME(coredump_netbsd)(struct lwp *l, struct coredump_iostate *cookie)
{

	return ENOSYS;
}

#endif	/* COREDUMP */