STM32堆栈

只看该作者 · 2015-3-20 22:41

1.堆和栈大小

定义大小在startup_stm32f2xx.s

Stack_Size EQU 0x00000400

AREA STACK, NOINIT, READWRITE, ALIGN=3
Stack_Mem SPACE Stack_Size
__initial_sp

; <h> Heap Configuration
; <o> Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
; </h>

Heap_Size EQU 0x00000200

AREA HEAP, NOINIT, READWRITE, ALIGN=3
__heap_base

只看该作者 · 2015-3-20 22:42

2.堆和栈位置

通过MAP文件可知

HEAP 0x200106f8 Section 512 startup_stm32f2xx.o(HEAP)
STACK 0x200108f8 Section 1024 startup_stm32f2xx.o(STACK)

__heap_base                            0x200106f8 Data          0  startup_stm32f2xx.o(HEAP)
__heap_limit                            0x200108f8 Data          0  startup_stm32f2xx.o(HEAP)
__initial_sp                            0x20010cf8 Data          0  startup_stm32f2xx.o(STACK)

显然 Cortex-m3资料可知：__initial_sp是堆栈指针，它就是FLASH的0x8000000地址前面4个字节（它根据堆栈大小，由编译器自动生成）

显然堆和栈是相邻的。