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/*
ChibiOS - Copyright (C) 2006..2019 Giovanni Di Sirio.
This file is part of ChibiOS.
ChibiOS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file sb/host/sbhost.c
* @brief ARM sandbox host code.
*
* @addtogroup ARM_SANDBOX
* @{
*/
#include "ch.h"
#include "sb.h"
/*===========================================================================*/
/* Module local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Module exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local types. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Module exported functions. */
/*===========================================================================*/
bool sb_is_valid_read_range(sb_class_t *sbcp, const void *start, size_t size) {
const sb_memory_region_t *rp = &sbcp->config->regions[0];
do {
if (((uint32_t)start >= rp->base) && ((uint32_t)start < rp->end) &&
(size <= ((size_t)rp->base - (size_t)start))) {
return true;
}
rp++;
} while (rp < &sbcp->config->regions[SB_NUM_REGIONS]);
return false;
}
bool sb_is_valid_write_range(sb_class_t *sbcp, void *start, size_t size) {
const sb_memory_region_t *rp = &sbcp->config->regions[0];
do {
if (((uint32_t)start >= rp->base) && ((uint32_t)start < rp->end) &&
(size <= ((size_t)rp->base - (size_t)start))) {
return rp->writeable;
}
rp++;
} while (rp < &sbcp->config->regions[SB_NUM_REGIONS]);
return false;
}
/**
* @brief Sandbox object initialization.
*
* @param[out] sbcp pointer to the sandbox object
*
* @init
*/
void sbObjectInit(sb_class_t *sbcp) {
sbcp->config = NULL;
sbcp->tp = NULL;
#if CH_CFG_USE_MESSAGES == TRUE
sbcp->msg_tp = NULL;
#endif
#if CH_CFG_USE_EVENTS == TRUE
chEvtObjectInit(&sbcp->es);
#endif
}
/**
* @brief Starts a sandboxed thread.
*
* @param[in] sbcp pointer to the sandbox object
* @return The function returns only if the operation failed.
*
* @api
*/
void sbStart(sb_class_t *sbcp, const sb_config_t *config) {
uint32_t pc, psp;
const sb_header_t *sbhp;
/* Header location.*/
sbhp = (const sb_header_t *)config->regions[config->code_region].base;
/* Checking header magic numbers.*/
if ((sbhp->hdr_magic1 != SB_MAGIC1) || (sbhp->hdr_magic2 != SB_MAGIC2)) {
return;
}
/* Checking header size and alignment.*/
if (sbhp->hdr_size != sizeof (sb_header_t)) {
return;
}
/* PC initial address, by convention it is immediately after the header.*/
pc = (config->regions[config->code_region].base + sizeof (sb_header_t)) | 1U;
/* PSP initial address.*/
psp = config->regions[config->data_region].end;
/* Additional context information.*/
sbcp->config = config;
sbcp->tp = chThdGetSelfX();
sbcp->tp->ctx.syscall.p = (const void *)sbcp;
sbcp->tp->ctx.syscall.psp = __get_PSP();
/* Jumping to the unprivileged code.*/
port_unprivileged_jump(pc, psp);
/* Must never happen condition.*/
chSysHalt("returned");
}
/** @} */
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