我搞了十几年嵌入式，才发现全局变量是这样初始化的

int counter, accumulator = 0, limit_value = 1000000;unsigned char str_aa55[2] = {0xAA,0x55};unsigned int int_1122334455667788 = 0x11223344;unsigned int int_55667788 = 0x55667788;int bss_val;void main(void){    }

  -- Clear local RAM  mov ___ghs_ramstart, r6  -- start of local RAM  mov ___ghs_ramend, r7    -- end of local RAM  mov r0, r11:  st.dw   r0, 0[r6]  addi    8, r6, r6  cmp r7, r6  bl 1b  -- Jump to the HW initialisation function  jarl  ___lowinit, lp  -- Jump to the initialisation functions of the library  -- and from there to main()  jr __start

int counter, accumulator = 0, limit_value = 1000000;unsigned char str_aa55[2] = {0xAA,0x55};unsigned int  int_1122334455667788 = 0x11223344;unsigned int  int_55667788 = 0x55667788;int bss_val;

    /* Init .data and .bss sections */    ldr     r0,=init_data_bss    blx     r0

void init_data_bss(void){    /* ...... */    /* Data */    data_ram        = (uint8_t *)__DATA_RAM;    data_rom        = (uint8_t *)__DATA_ROM;    data_rom_end    = (uint8_t *)__DATA_END;    /* ...... */    /* BSS */    bss_start       = (uint8_t *)__BSS_START;    bss_end         = (uint8_t *)__BSS_END;    /* ...... */        /* Copy initialized data from ROM to RAM */    while (data_rom_end != data_rom)    {        *data_ram = *data_rom;        data_ram++;        data_rom++;    }        /* ...... */    /* Clear the zero-initialized data section */    while(bss_end != bss_start)    {        *bss_start = 0;        bss_start++;    }    /* ...... */}

/* Specify the memory areas */MEMORY{  /* … */  /* SRAM_L */  m_data   (RW)  : ORIGIN = 0x1FFF8000, LENGTH = 0x00008000 m_data_2  (RW)  : ORIGIN = 0x20000000, LENGTH = 0x00007000
  /* … */  .data : AT(__DATA_ROM)  {    . = ALIGN(4);    __DATA_RAM = .;    __data_start__ = .;      /* Create a global symbol at data start. */    *(.data)                 /* .data sections */    *(.data*)                /* .data* sections */    . = ALIGN(4);    __data_end__ = .;        /* Define a global symbol at data end. */  } > m_data
  __DATA_END = __DATA_ROM + (__data_end__ - __data_start__);  __CODE_ROM = __DATA_END; /* Symbol is used by code initialization. */

  /* Uninitialized data section. */  .bss :  {    /* This is used by the startup in order to initialize the .bss section. */    . = ALIGN(4);    __BSS_START = .;    __bss_start__ = .;    *(.bss)    *(.bss*)    *(COMMON)    . = ALIGN(4);    __bss_end__ = .;    __BSS_END = .;  } > m_data_2

.data           0x1fff8400      0x42c load address 0x000009cc                0x1fff8400                . = ALIGN (0x4)                0x1fff8400                __DATA_RAM = .                0x1fff8400                __data_start__ = . *(.data) *(.data*) .data.limit_value                0x1fff8400        0x4 ./src/main.o                0x1fff8400                limit_value .data.str_aa55                0x1fff8404        0x2 ./src/main.o                0x1fff8404                str_aa55 *fill*         0x1fff8406        0x2  .data.int_11223344                0x1fff8408        0x4 ./src/main.o                0x1fff8408                int_11223344 .data.int_55667788                0x1fff840c        0x4 ./src/main.o                0x1fff840c                int_55667788

.bss            0x20000000       0x28                0x20000000                . = ALIGN (0x4)                0x20000000                __BSS_START = .                0x20000000                __bss_start__ = . *(.bss) *(.bss*) .bss.accumulator                0x2000001c        0x4 ./src/main.o                0x2000001c                accumulator *(COMMON) COMMON         0x20000020        0x8 ./src/main.o                0x20000020                bss_val                0x20000024                counter                0x20000028                . = ALIGN (0x4)                0x20000028                __bss_end__ = .                0x20000028                __BSS_END = .
                0x000009cc                __DATA_ROM = .

int limit_value = 1000000;unsigned char str_aa55[2] = {0xAA,0x55};unsigned int  int_1122334455667788 = 0x11223344;unsigned int  int_55667788 = 0x55667788;