Diff: targets/TARGET_NUVOTON/TOOLCHAIN_ARM/sys.cpp

Revision:

187:0387e8f68319

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_NUVOTON/TOOLCHAIN_ARM/sys.cpp	Thu Sep 06 13:40:20 2018 +0100
@@ -0,0 +1,74 @@
+/* mbed Microcontroller Library - stackheap
+ * Copyright (C) 2009-2011 ARM Limited. All rights reserved.
+ *
+ * Setup a fixed single stack/heap memory model,
+ *  between the top of the RW/ZI region and the stackpointer
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if defined(__ARMCC_VERSION) && (__ARMCC_VERSION >= 6010050)
+#include <arm_compat.h>
+#endif
+
+#include <rt_misc.h>
+#include <stdint.h>
+
+extern char Image$$ARM_LIB_STACK$$ZI$$Limit[];
+extern char Image$$ARM_LIB_HEAP$$Base[];
+extern char Image$$ARM_LIB_HEAP$$ZI$$Limit[];
+extern __value_in_regs struct __initial_stackheap _mbed_user_setup_stackheap(uint32_t R0, uint32_t R1, uint32_t R2, uint32_t R3) {
+
+    struct __initial_stackheap r;
+    r.heap_base = (uint32_t)Image$$ARM_LIB_HEAP$$Base;
+    r.heap_limit = (uint32_t)Image$$ARM_LIB_HEAP$$ZI$$Limit;
+    return r;
+}
+
+#if !defined(MBED_CONF_RTOS_PRESENT) || !MBED_CONF_RTOS_PRESENT
+
+/* The single region memory model would check stack collision at run time, verifying that
+ * the heap pointer is underneath the stack pointer. With two-region memory model/RTOS-less or
+ * multiple threads(stacks)/RTOS, the check gets meaningless and we must disable it. */
+#if defined (__ARMCC_VERSION) && (__ARMCC_VERSION >= 6010050)
+__asm(".global __use_two_region_memory\n\t");
+__asm(".global __use_no_semihosting\n\t");
+#else
+#pragma import(__use_two_region_memory)
+#endif
+
+/* Fix __user_setup_stackheap and ARM_LIB_STACK/ARM_LIB_HEAP cannot co-exist in RTOS-less build
+ *
+ * According AN241 (http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dai0241b/index.html),
+ * __rt_entry has the following call sequence:
+ * 1. _platform_pre_stackheap_init
+ * 2. __user_setup_stackheap or setup the Stack Pointer (SP) by another method
+ * 3. _platform_post_stackheap_init
+ * 4. __rt_lib_init
+ * 5. _platform_post_lib_init
+ * 6. main()
+ * 7. exit()
+ *
+ * Per our check, when __user_setup_stackheap and ARM_LIB_STACK/ARM_LIB_HEAP co-exist, neither
+ * does __user_setup_stackheap get called and nor is ARM_LIB_HEAP used to get heap base/limit,
+ * which are required to pass to __rt_lib_init later. To fix the issue, by subclass'ing
+ * __rt_lib_init, heap base/limit are replaced with Image$$ARM_LIB_HEAP$$ZI$$Base/Limit if
+ * ARM_LIB_HEAP region is defined in scatter file.
+ *
+ * The overriding __rt_lib_init is needed only for rtos-less code. For rtos code, __rt_entry is
+ * overridden and the overriding __rt_lib_init here gets meaningless.
+ */
+extern __value_in_regs struct __argc_argv $Super$$__rt_lib_init(unsigned heapbase, unsigned heaptop);
+
+__value_in_regs struct __argc_argv $Sub$$__rt_lib_init (unsigned heapbase, unsigned heaptop)
+{
+    return $Super$$__rt_lib_init((unsigned) Image$$ARM_LIB_HEAP$$Base, (unsigned) Image$$ARM_LIB_HEAP$$ZI$$Limit);
+}
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif