usr/src/lib/libtnfctl/targmem.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 1994, by Sun Microsytems, Inc.
  24  */
  25
  26 #pragma ident   "%Z%%M% %I%     %E% SMI"
  27
  28 /*
  29  * Function to allocate memory in target process (used by combinations).
  30  */
  31
  32 #ifndef DEBUG
  33 #define NDEBUG  1
  34 #endif
  35
  36 #include <assert.h>
  37 #include "tnfctl_int.h"
  38 #include "prb_internals.h"
  39 #include "dbg.h"
  40
  41
  42 /*
  43  * _tnfctl_targmem_alloc() - allocates memory in the target process.
  44  */
  45 tnfctl_errcode_t
  46 _tnfctl_targmem_alloc(tnfctl_handle_t *hndl, size_t size, uintptr_t *addr_p)
  47 {
  48         int                     miscstat;
  49         tnf_memseg_t            memseg;
  50
  51         assert(hndl->memseg_p != NULL);
  52         *addr_p = NULL;
  53
  54         /* read the memseg block from the target process */
  55         miscstat = hndl->p_read(hndl->proc_p, hndl->memseg_p, &memseg,
  56                 sizeof (memseg));
  57         if (miscstat)
  58                 return (TNFCTL_ERR_INTERNAL);
  59
  60         /* if there is memory left, allocate it */
  61         if ((memseg.min_p + memseg.i_reqsz) <= (memseg.max_p - size)) {
  62                 memseg.max_p -= size;
  63
  64                 miscstat = hndl->p_write(hndl->proc_p, hndl->memseg_p,
  65                         &memseg, sizeof (memseg));
  66                 if (miscstat)
  67                         return (TNFCTL_ERR_INTERNAL);
  68
  69                 *addr_p = (uintptr_t) memseg.max_p;
  70
  71                 DBG_TNF_PROBE_2(_tnfctl_targmem_alloc_1, "libtnfctl",
  72                         "sunw%verbosity 3",
  73                         tnf_long, size_allocated, size,
  74                         tnf_opaque, at_location, *addr_p);
  75
  76                 return (TNFCTL_ERR_NONE);
  77         } else {
  78                 return (TNFCTL_ERR_INTERNAL);
  79         }
  80 }