strace/numa.c

/*
 * Copyright (c) 2003-2007 Ulrich Drepper <drepper@redhat.com>
 * Copyright (c) 2005-2016 Dmitry V. Levin <ldv@altlinux.org>
 * Copyright (c) 2016-2018 The strace developers.
 * All rights reserved.
 *
 * SPDX-License-Identifier: LGPL-2.1-or-later
 */

#include "defs.h"

static bool
print_node(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
{
	if (elem_size < sizeof(kernel_ulong_t)) {
		tprintf("%#0*x", (int) elem_size * 2 + 2,
			*(unsigned int *) elem_buf);
	} else {
		tprintf("%#0*" PRI_klx, (int) elem_size * 2 + 2,
			*(kernel_ulong_t *) elem_buf);
	}

	return true;
}

static void
print_nodemask(struct tcb *const tcp, const kernel_ulong_t addr,
	       const kernel_ulong_t maxnodes)
{
	const unsigned int bits_per_long = 8 * current_wordsize;
	const kernel_ulong_t nmemb =
		(maxnodes + bits_per_long - 2) / bits_per_long;

	if (nmemb < maxnodes / bits_per_long ||
	    (maxnodes && !nmemb)) {
		printaddr(addr);
		return;
	}

	kernel_ulong_t buf;
	print_array(tcp, addr, nmemb, &buf, current_wordsize,
		    tfetch_mem, print_node, 0);
}

SYS_FUNC(migrate_pages)
{
	tprintf("%d, %" PRI_klu ", ", (int) tcp->u_arg[0], tcp->u_arg[1]);
	print_nodemask(tcp, tcp->u_arg[2], tcp->u_arg[1]);
	tprints(", ");
	print_nodemask(tcp, tcp->u_arg[3], tcp->u_arg[1]);

	return RVAL_DECODED;
}

#include "xlat/policies.h"
#include "xlat/mbindflags.h"

SYS_FUNC(mbind)
{
	printaddr(tcp->u_arg[0]);
	tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
	printxval64(policies, tcp->u_arg[2], "MPOL_???");
	tprints(", ");
	print_nodemask(tcp, tcp->u_arg[3], tcp->u_arg[4]);
	tprintf(", %" PRI_klu ", ", tcp->u_arg[4]);
	printflags(mbindflags, tcp->u_arg[5], "MPOL_???");

	return RVAL_DECODED;
}

SYS_FUNC(set_mempolicy)
{
	printxval(policies, tcp->u_arg[0], "MPOL_???");
	tprints(", ");
	print_nodemask(tcp, tcp->u_arg[1], tcp->u_arg[2]);
	tprintf(", %" PRI_klu, tcp->u_arg[2]);

	return RVAL_DECODED;
}

#include "xlat/mempolicyflags.h"

SYS_FUNC(get_mempolicy)
{
	if (exiting(tcp)) {
		int pol;
		if (!umove_or_printaddr(tcp, tcp->u_arg[0], &pol)) {
			tprints("[");
			printxval(policies, pol, "MPOL_???");
			tprints("]");
		}
		tprints(", ");
		print_nodemask(tcp, tcp->u_arg[1], tcp->u_arg[2]);
		tprintf(", %" PRI_klu ", ", tcp->u_arg[2]);
		printaddr(tcp->u_arg[3]);
		tprints(", ");
		printflags64(mempolicyflags, tcp->u_arg[4], "MPOL_???");
	}
	return 0;
}

#include "xlat/move_pages_flags.h"

static bool
print_addr(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
{
	kernel_ulong_t addr;

	if (elem_size < sizeof(addr)) {
		addr = *(unsigned int *) elem_buf;
	} else {
		addr = *(kernel_ulong_t *) elem_buf;
	}

	printaddr(addr);

	return true;
}

static bool
print_status(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
{
	const int status = *(int *) elem_buf;

	if (status < 0 && (unsigned) -status < nerrnos)
		tprintf("-%s", errnoent[-status]);
	else
		tprintf("%d", status);

	return true;
}

SYS_FUNC(move_pages)
{
	const kernel_ulong_t npages = tcp->u_arg[1];
	kernel_ulong_t buf;

	if (entering(tcp)) {
		tprintf("%d, %" PRI_klu ", ", (int) tcp->u_arg[0], npages);
		print_array(tcp, tcp->u_arg[2], npages, &buf, current_wordsize,
			    tfetch_mem, print_addr, 0);
		tprints(", ");
		print_array(tcp, tcp->u_arg[3], npages, &buf, sizeof(int),
			    tfetch_mem, print_int32_array_member, 0);
		tprints(", ");
	} else {
		print_array(tcp, tcp->u_arg[4], npages, &buf, sizeof(int),
			    tfetch_mem, print_status, 0);
		tprints(", ");
		printflags(move_pages_flags, tcp->u_arg[5], "MPOL_???");
	}
	return 0;
}