From 48026bb824fd2d9cfb00ecd040db6ef3a416bae9 Mon Sep 17 00:00:00 2001
From: Clyne Sullivan <clyne@bitgloo.com>
Date: Fri, 22 Jan 2021 21:43:36 -0500
Subject: upload initial port

---
 ChibiOS_20.3.2/os/sb/host/sbhost.c | 146 +++++++++++++++++++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 ChibiOS_20.3.2/os/sb/host/sbhost.c

(limited to 'ChibiOS_20.3.2/os/sb/host/sbhost.c')

diff --git a/ChibiOS_20.3.2/os/sb/host/sbhost.c b/ChibiOS_20.3.2/os/sb/host/sbhost.c
new file mode 100644
index 0000000..177a144
--- /dev/null
+++ b/ChibiOS_20.3.2/os/sb/host/sbhost.c
@@ -0,0 +1,146 @@
+/*
+    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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