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