* First stab at loadable contiki modules in plural form.
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167
core/loader/cmod.c
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167
core/loader/cmod.c
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/*
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* Copyright (c) 2007, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)$Id: cmod.c,v 1.1 2007/01/05 18:01:06 bg- Exp $
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*/
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#include <stdio.h>
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#include <string.h>
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#include "contiki.h"
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#include "loader/cle.h"
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#include "loader/cmod.h"
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#include "lib/malloc.h"
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#include "lib/assert.h"
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#if 1
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#define PRINTF(...) do {} while (0)
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#else
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#define PRINTF(...) printf(__VA_ARGS__)
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#endif
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#ifndef CMOD_NMODULES
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#define CMOD_NMODULES 4
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#endif
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struct cmod_info cmod_module[CMOD_NMODULES];
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int
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cmod_load(unsigned imod,
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cle_scratch scratch,
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int (*pread)(void *, int, off_t),
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off_t off)
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{
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struct cle_info h;
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int ret;
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void (*init)(void);
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if(imod >= CMOD_NMODULES) {
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PRINTF("imod to large");
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return 100;
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}
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if(cmod_module[imod].ram != NULL || cmod_module[imod].fini != NULL) {
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PRINTF("module busy\n");
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return 101;
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}
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/* The (ELF) header is located at the start of the buffer. */
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ret = cle_read_info(&h, pread, off);
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if(ret != CLE_OK) {
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strcpy(scratch, h.name);
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return ret;
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}
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cmod_module[imod].ram = malloc(h.datasize + h.bsssize + h.textsize);
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if(cmod_module[imod].ram == NULL) {
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return CMOD_DATA_TO_LARGE;
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}
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/*
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* Here we specify where we want to relocate to.
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*/
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h.data = cmod_module[imod].ram;
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h.bss = h.data + h.datasize;
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h.text = h.bss + h.bsssize;
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PRINTF("cmod: copy text segment to RAM %p %p\n",
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h.text, h.text + h.textsize);
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ret = pread(h.text, h.textsize, off + h.textoff);
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assert(ret > 0);
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if(h.textrelasize > 0) {
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PRINTF("cmod: relocate text in RAM\n");
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ret = cle_relocate(&h,
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pread,
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off,
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h.text,
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h.textrelaoff, h.textrelasize);
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if(ret != CLE_OK) {
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strcpy(scratch, h.name);
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return ret;
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}
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}
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PRINTF("cmod: copy data segment to RAM %p %p\n",
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h.data, h.data + h.datasize);
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ret = pread(h.data, h.datasize, off + h.dataoff);
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assert(ret > 0);
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if(h.datarelasize > 0) {
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PRINTF("cmod: relocate data segment\n");
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ret = cle_relocate(&h,
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pread,
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off,
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h.data,
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h.datarelaoff, h.datarelasize);
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if(ret != CLE_OK) {
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strcpy(scratch, h.name);
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return ret;
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}
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}
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PRINTF("cmod: zero bss %p %p\n", h.bss, h.bss + h.bsssize);
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memset(h.bss, 0, h.bsssize);
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cmod_module[imod].fini = cle_lookup(&h, pread, off, "_fini");
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init = cle_lookup(&h, pread, off, "_init");
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if(init != NULL) {
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PRINTF("init=%p fini=%p\n", init, cmod_module[imod].fini);
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(*init)();
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return CLE_OK;
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} else
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return CMOD_NO_STARTPOINT;
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}
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void
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cmod_unload(int imod)
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{
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if(cmod_module[imod].fini != NULL) {
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(*cmod_module[imod].fini)();
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cmod_module[imod].fini = NULL;
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}
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if(cmod_module[imod].ram != NULL) {
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free(cmod_module[imod].ram);
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cmod_module[imod].ram = NULL;
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}
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}
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#if 0
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void
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cmod_status(void)
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{
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unsigned i;
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PRINTF("Id Module Address Fini\n");
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for(i = 0; i < CMOD_NMODULES; i++)
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if(cmod_module[i].ram != NULL)
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PRINTF("%2d %-8s %7p %4p\n", i,
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cmod_module[i].name, cmod_module[i].ram, cmod_module[i].fini);
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}
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#endif
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56
core/loader/cmod.h
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56
core/loader/cmod.h
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@ -0,0 +1,56 @@
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/*
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* Copyright (c) 2007, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)$Id: cmod.h,v 1.1 2007/01/05 18:00:55 bg- Exp $
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*/
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#ifndef CMOD_H
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#define CMOD_H
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struct cmod_info {
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cle_addr ram;
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/* cle_addr rom; */
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void (*fini)(void);
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};
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extern struct cmod_info cmod_module[];
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int
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cmod_load(unsigned imod,
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cle_scratch name,
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int (*pread)(void *, int, off_t),
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off_t off);
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void cmod_unload(int imod);
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/* Most error codes are chared with elfloader and cle. */
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#define CMOD_OK 0
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#define CMOD_NO_STARTPOINT 7
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#define CMOD_DATA_TO_LARGE 9
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#endif /* CMOD_H */
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