查看HC32的源代码

=== Debug ===

查看生成的变量地址：

<source lang=bash>
$ ../../../toolchain/gcc-arm-none-eabi/bin/arm-none-eabi-nm -n build/main.elf  | grep k
00000108 T _Z15key_irq_handlerv
00000190 T SystemCoreClockUpdate
000001a0 T systick_init
00000368 W _sbrk
000003a0 T _kill
000003d0 T _lseek
000003f0 T _link
00000958 T Sysctrl_GetHClkFreq
00000a78 T Sysctrl_GetPClkFreq
00000b2c T SysTick_Handler
0000144c T _sbrk_r
00001470 T __malloc_lock
00001472 T __malloc_unlock
00001498 t .udivsi3_skip_div0_test
000015ac t .divsi3_skip_div0_test
20000000 D SystemCoreClock
20000004 d _tx_ok
20000094 B k
200001a8 b secTicks
200001b0 B __malloc_sbrk_start
200001b4 B msTicks_cnt
200001b8 B msTicks
200005c0 ? stack
20001c00 A __StackLimit
20002000 A __stack
20002000 B __StackTop
</source>

查看 .data .bss 段大小：
<source lang=bash>
$ ../../../toolchain/gcc-arm-none-eabi/bin/arm-none-eabi-size.exe build/main.elf
   text    data     bss     dec     hex filename
   9740     124     324   10188    27cc build/main.elf

set the global var 'int k = 0':
$ ../../../toolchain/gcc-arm-none-eabi/bin/arm-none-eabi-size.exe build/main.elf
   text    data     bss     dec     hex filename
   9760     120     328   10208    27e0 build/main.elf
</source>

* .data：初始值存储在 Flash 中，启动时复制到 RAM
* .bss：只需要记录大小信息，不需要在 Flash 中存储 0 值。（Block Started by Symbol）段存放：
** '''未初始化'''的'''全局变量'''
** '''未初始化'''的静态变量
** '''初始化为 0''' 的变量（包括静态变量）

<source lang=bash>
FLASH 存储器：
    +---------------+
    | .text (代码)  |
    +---------------+
    | .rodata (常量)|
    +---------------+
    | .data (初始值)|
    +---------------+
    | ...           |
    +---------------+

RAM 存储器：
    +---------------+
    | .data (副本)  | ← 从 Flash 复制过来
    +---------------+
    | .bss          | ← 启动时清零
    +---------------+
    | 堆 (heap)     |
    +---------------+
    | 栈 (stack)    |
    +---------------+
</source>


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