nes-proj/core/loader/cmod.c

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/*
* Copyright (c) 2007, Swedish Institute of Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)$Id: cmod.c,v 1.3 2007/04/26 13:38:52 bg- Exp $
*/
#include <stdio.h>
#include <string.h>
#include "contiki.h"
#include "loader/elf32.h"
#include "loader/cle.h"
#include "loader/cmod.h"
#include "lib/malloc.h"
#include "lib/assert.h"
#if 1
#define PRINTF(...) do {} while (0)
#else
#define PRINTF(...) printf(__VA_ARGS__)
#endif
#ifndef CMOD_NMODULES
#define CMOD_NMODULES 4
#endif
struct cmod_info cmod_module[CMOD_NMODULES];
int
cmod_load(unsigned imod,
cle_scratch scratch,
int (*pread)(void *, int, off_t),
off_t off)
{
struct cle_info h;
int ret;
void (*init)(void);
if(imod >= CMOD_NMODULES) {
PRINTF("imod to large");
return 100;
}
if(cmod_module[imod].ram != NULL || cmod_module[imod].fini != NULL) {
PRINTF("module busy\n");
return 101;
}
/* The (ELF) header is located at the start of the buffer. */
ret = cle_read_info(&h, pread, off);
if(ret != CLE_OK) {
strcpy(scratch, h.name);
return ret;
}
cmod_module[imod].ram = malloc(h.datasize + h.bsssize + h.textsize);
if(cmod_module[imod].ram == NULL) {
return CMOD_DATA_TO_LARGE;
}
/*
* Here we specify where we want to relocate to.
*/
h.data = cmod_module[imod].ram;
h.bss = h.data + h.datasize;
h.text = (cle_addr)h.bss + h.bsssize;
PRINTF("cmod: copy text segment to RAM %p %p\n",
h.text, h.text + h.textsize);
ret = pread((void *)h.text, h.textsize, off + h.textoff);
assert(ret > 0);
if(h.textrelasize > 0) {
PRINTF("cmod: relocate text in RAM\n");
ret = cle_relocate(&h,
pread,
off,
(void *)h.text,
h.textrelaoff, h.textrelasize);
if(ret != CLE_OK) {
strcpy(scratch, h.name);
return ret;
}
}
PRINTF("cmod: copy data segment to RAM %p %p\n",
h.data, h.data + h.datasize);
ret = pread(h.data, h.datasize, off + h.dataoff);
assert(ret > 0);
if(h.datarelasize > 0) {
PRINTF("cmod: relocate data segment\n");
ret = cle_relocate(&h,
pread,
off,
h.data,
h.datarelaoff, h.datarelasize);
if(ret != CLE_OK) {
strcpy(scratch, h.name);
return ret;
}
}
PRINTF("cmod: zero bss %p %p\n", h.bss, h.bss + h.bsssize);
memset(h.bss, 0, h.bsssize);
cmod_module[imod].fini = cle_lookup(&h, pread, off, "_fini");
init = cle_lookup(&h, pread, off, "_init");
if(init != NULL) {
PRINTF("init=%p fini=%p\n", init, cmod_module[imod].fini);
(*init)();
return CLE_OK;
} else
return CMOD_NO_STARTPOINT;
}
void
cmod_unload(int imod)
{
if(cmod_module[imod].fini != NULL) {
(*cmod_module[imod].fini)();
cmod_module[imod].fini = NULL;
}
if(cmod_module[imod].ram != NULL) {
free(cmod_module[imod].ram);
cmod_module[imod].ram = NULL;
}
}
#if 0
void
cmod_status(void)
{
unsigned i;
PRINTF("Id Module Address Fini\n");
for(i = 0; i < CMOD_NMODULES; i++)
if(cmod_module[i].ram != NULL)
PRINTF("%2d %-8s %7p %4p\n", i,
cmod_module[i].name, cmod_module[i].ram, cmod_module[i].fini);
}
#endif