lib/libtnfctl/targmem.c

	targmem.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1994, by Sun Microsytems, Inc.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * Function to allocate memory in target process (used by combinations).
 */

#ifndef DEBUG
#define NDEBUG  1
#endif

#include <assert.h>
#include "tnfctl_int.h"
#include "prb_internals.h"
#include "dbg.h"


/*
 * _tnfctl_targmem_alloc() - allocates memory in the target process.
 */
tnfctl_errcode_t
_tnfctl_targmem_alloc(tnfctl_handle_t *hndl, size_t size, uintptr_t *addr_p)
{
    int         miscstat;
    tnf_memseg_t        memseg;

    assert(hndl->memseg_p != NULL);
    *addr_p = NULL;

    /* read the memseg block from the target process */
    miscstat = hndl->p_read(hndl->proc_p, hndl->memseg_p, &memseg,
        sizeof (memseg));
    if (miscstat)
        return (TNFCTL_ERR_INTERNAL);

    /* if there is memory left, allocate it */
    if ((memseg.min_p + memseg.i_reqsz) <= (memseg.max_p - size)) {
        memseg.max_p -= size;

        miscstat = hndl->p_write(hndl->proc_p, hndl->memseg_p,
            &memseg, sizeof (memseg));
        if (miscstat)
            return (TNFCTL_ERR_INTERNAL);

        *addr_p = (uintptr_t) memseg.max_p;

        DBG_TNF_PROBE_2(_tnfctl_targmem_alloc_1, "libtnfctl",
            "sunw%verbosity 3",
            tnf_long, size_allocated, size,
            tnf_opaque, at_location, *addr_p);

        return (TNFCTL_ERR_NONE);
    } else {
        return (TNFCTL_ERR_INTERNAL);
    }
}