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netbsd.cpp revision 1.1 
      1 /*	$NetBSD: netbsd.cpp,v 1.1 2013/04/28 12:11:26 kiyohara Exp $	*/
      2 /*
      3  * Copyright (c) 2012 KIYOHARA Takashi
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
     19  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     23  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
     24  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     25  * POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 #include <e32cons.h>
     28 #include <e32std.h>
     29 #include <f32file.h>
     30 
     31 #include "e32boot.h"
     32 #include "elf.h"
     33 #include "netbsd.h"
     34 
     35 
     36 NetBSD *
     37 NetBSD::New(const TDesC &aFilename)
     38 {
     39 	NetBSD *netbsd = NULL;
     40 	RFs fsSession;
     41 	RFile file;
     42 	TInt size;
     43 	union {
     44 		Elf32_Ehdr elf;
     45 	} hdr;
     46 
     47 	/* Connect to FileServer Session */
     48 	User::LeaveIfError(fsSession.Connect());
     49 
     50 	User::LeaveIfError(file.Open(fsSession, aFilename, EFileRead));
     51 	User::LeaveIfError(file.Size(size));
     52 
     53 	TPtr hdrBuf((TUint8 *)&hdr, sizeof(hdr));
     54 	User::LeaveIfError(file.Read(hdrBuf));
     55 	/* Currently support is ELF only. */
     56 	if (Mem::Compare((TUint8 *)hdr.elf.e_ident, SELFMAG,
     57 					(TUint8 *)ELFMAG, SELFMAG) == 0) {
     58 		netbsd = new (ELeave) ELF(size);
     59 	} else
     60 		User::Leave(KErrNotSupported);
     61 	TInt pos = 0;
     62 	User::LeaveIfError(file.Seek(ESeekStart, pos));
     63 
     64 	TPtr fileBuf(netbsd->Buffer, size);
     65 	User::LeaveIfError(file.Read(fileBuf));
     66 	if (fileBuf.Length() != size)
     67 		User::Leave(KErrNotFound);
     68 	file.Close();
     69 
     70 	/* Close FileServer Session */
     71 	fsSession.Close();
     72 
     73 	netbsd->LoadDescriptor =
     74 	    (struct loaddesc *)PAGE_ALIGN(User::AllocL(ALIGN_SAFE_PAGE_SIZE));
     75 
     76 	return netbsd;
     77 }
     78 
     79 
     80 void
     81 ELF::ParseHeader(void)
     82 {
     83 	struct loaddesc *loaddesc = LoadDescriptor;
     84 	Elf32_Ehdr ehdr;
     85 	Elf32_Phdr *phdr = NULL;
     86 	int PhdrSize, i;
     87 
     88 	Mem::Copy(&ehdr, Buffer, sizeof(ehdr));
     89 	PhdrSize = sizeof(Elf32_Phdr) * ehdr.e_phnum;
     90 	phdr = (Elf32_Phdr *) new (ELeave) TUint8[PhdrSize];
     91 	Mem::Copy(phdr, Buffer + ehdr.e_phoff, PhdrSize);
     92 
     93 	for (i = 0; i < ehdr.e_phnum; i++) {
     94 		if (phdr[i].p_type != PT_LOAD ||
     95 		    (phdr[i].p_flags & (PF_W | PF_X)) == 0)
     96 			continue;
     97 
     98 		loaddesc->addr = VTOP(phdr[i].p_vaddr);
     99 		loaddesc->offset = phdr[i].p_offset;
    100 		loaddesc->size = phdr[i].p_filesz;
    101 		loaddesc++;
    102 	}
    103 	/* Terminate loaddesc. */
    104 	loaddesc->addr = 0xffffffff;
    105 	loaddesc->offset = 0xffffffff;
    106 	loaddesc->size = 0xffffffff;
    107 
    108 	EntryPoint = ehdr.e_entry;
    109 }
    110