/*
 * See the dyninst/COPYRIGHT file for copyright information.
 *
 * We provide the Paradyn Tools (below described as "Paradyn")
 * on an AS IS basis, and do not warrant its validity or performance.
 * We reserve the right to update, modify, or discontinue this
 * software at any time.  We shall have no obligation to supply such
 * updates or modifications or any other form of support to you.
 *
 * By your use of Paradyn, you understand and agree that we (or any
 * other person or entity with proprietary rights in Paradyn) are
 * under no obligation to provide either maintenance services,
 * update services, notices of latent defects, or correction of
 * defects for Paradyn.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/* $Id: RTheap-linux.c,v 1.9 2008/01/31 18:01:54 legendre Exp $ */
/* RTheap-linux.c: Linux-specific heap components */

#include "RTheap.h"
#include <assert.h>
#include <fcntl.h> /* open() */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>   /* str* */
#include <sys/mman.h> /* mmap() */
#include <sys/stat.h> /* open() */
#include <sys/types.h>
#include <sys/uio.h> /* read() */
#include <unistd.h>  /* sbrk(), read(), mmap */

#if 1  // defined(MUTATEE64)

int DYNINSTheap_align = 4; /* heaps are word-aligned */

Address DYNINSTheap_loAddr = 0x10000; /* Bump to 64k to make SELinux happier */
Address DYNINSTheap_hiAddr = ~(Address) 0x0;
#elif defined(arch_power)
int     DYNINSTheap_align = 4; /* heaps are word-aligned */
Address DYNINSTheap_loAddr =
    ~(Address) 0;  // should be defined by getpagesize() when used.
Address DYNINSTheap_hiAddr = ~(Address) 0;
#else
int DYNINSTheap_align = 4; /* heaps are word-aligned */

Address DYNINSTheap_loAddr = 0x50000000;
Address DYNINSTheap_hiAddr = 0xb0000000;
#endif

int DYNINSTheap_mmapFlags = MAP_ANONYMOUS | MAP_PRIVATE;

RT_Boolean
DYNINSTheap_useMalloc(void* lo, void* hi)
{
    /* We do not save footprint space by allocating in
       the user's heap on this platform, so we stay out of it. */
    (void) lo; /* unused parameter */
    (void) hi; /* unused parameter */
    return RT_FALSE;
}

int
DYNINSTheap_mmapFdOpen(void)
{
    int fd = open("/dev/zero", O_RDWR);
    return fd;
}

void
DYNINSTheap_mmapFdClose(int fd)
{
    close(fd);
}

int
DYNINSTgetMemoryMap(unsigned* nump, dyninstmm_t** mapp)
{
    FILE*   procmaps;
    Address saddr = 0, eaddr = 0;
    int     num_matches;
    procmaps          = fopen("/proc/self/maps", "r");
    dyninstmm_t* maps = *mapp;
    if(procmaps == NULL) return -1;
    *nump = 0;
    while(((num_matches = fscanf(procmaps, "%lx-%lx", &saddr, &eaddr)) != EOF) &&
          (*nump < 1024))
    {
        if(num_matches == 2)
        {
            maps[*nump].pr_vaddr = saddr;
            maps[*nump].pr_size  = eaddr - saddr;
            (*nump)++;
            // skip to next line
            int ch;
            while((ch = fgetc(procmaps)) != '\n' && ch != EOF)
            {
                if(ch == EOF) break;
            }
        }
        else
        {
            break;
        }
    }
    fclose(procmaps);
    return *nump < 1024;

    /*
       Here are two lines from 'cat /proc/self/maps' on Linux 2.2.  Each
       describes a segment of the address space.  We parse out the first
       two addresses for the start address and length of the segment.  We
       throw away the rest.

       |SADDR-| |EADDR-|
       0804a000-0804c000 rw-p 00001000 08:09 12089      /bin/cat
       0804c000-0804f000 rwxp 00000000 00:00 0
    */
}