STM32F4: GNU AS: Мигаем светодиодом (Версия для STM32F4 Discovery, Оптимизация) (Часть 3)

Program Size:
      text	   data	    bss	    dec	    hex	filename
        52	      0	  65536	  65588	  10034	Gate_Tester.elf

void min_Reset_Handler();

#define STACK_SIZE       0x00004000      /*!< Stack size (in Words)           */
__attribute__ ((section(".co_stack"))) unsigned long minStack[STACK_SIZE];

__attribute__ ((section(".min_isr_vector"))) void (* const minVectors[])(void) =
{
  (void *)&minStack[STACK_SIZE-1],     /*!< The initial stack pointer*/
  min_Reset_Handler,                   /*!< Reset Handler            */
};

void min_Reset_Handler()
{
	RCC->AHB1ENR |= RCC_AHB1ENR_GPIODEN;
	GPIOD->MODER |= GPIO_MODER_MODER15_0;

	uint32_t counter;
	volatile uint32_t *led = (*(volatile uint32_t *)(PERIPH_BB_BASE + ((((uint32_t)&GPIOD->ODR) - PERIPH_BASE)*32) + 15*4));

	while (true)
	{
		(*led) = counter >> 31;
		counter += 1024;
	}
}

Disassembly of section .text:

08000000 <minVectors>:
 8000000:	fc ff 00 10 09 00 00 08                             ........

08000008 <min_Reset_Handler>:
 8000008:	4b08      	ldr	r3, [pc, #32]	; (800002c <min_Reset_Handler+0x24>)

;RCC->AHB1ENR |= RCC_AHB1ENR_GPIODEN;
 800000a:	6b19      	ldr	r1, [r3, #48]	; 0x30
 800000c:	f041 0108 	orr.w	r1, r1, #8
 8000010:	6319      	str	r1, [r3, #48]	; 0x30

;GPIOD->MODER |= GPIO_MODER_MODER15_0;
 8000012:	f5a3 5330 	sub.w	r3, r3, #11264	; 0x2c00
 8000016:	6819      	ldr	r1, [r3, #0]
 8000018:	f041 4180 	orr.w	r1, r1, #1073741824	; 0x40000000
 800001c:	6019      	str	r1, [r3, #0]

;volatile uint32_t *led = (*(volatile uint32_t *)(PERIPH_BB_BASE + ((((uint32_t)&GPIOD->ODR) - PERIPH_BASE)*32) + 15*4));
 800001e:	4b04      	ldr	r3, [pc, #16]	; (8000030 <min_Reset_Handler+0x28>)

;uint32_t counter;
 8000020:	681b      	ldr	r3, [r3, #0]

<min_Reset_Handler_while>:
 8000022:	0fd1      	lsrs	r1, r2, #31	; 
 8000024:	6019      	str	r1, [r3, #0]    ; (*led) = counter >> 31;
 8000026:	f502 6280 	add.w	r2, r2, #1024	; counter += 1024;
 800002a:	e7fa      	b.n	8000022 <min_Reset_Handler_while>

 800002c:	40023800 	.word	0x40023800
 8000030:	424182bc 	.word	0x424182bc 

или в сыром виде без моих камментов:

OUTPUT_FORMAT ("elf32-littlearm", "elf32-bigarm", "elf32-littlearm")
/* Internal Memory Map*/
MEMORY
{
	rom (rx)  : ORIGIN = 0x08000000, LENGTH = 0x000F8000
	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 0x00020000
	ccm (rwx) : ORIGIN = 0x10000000, LENGTH = 0x00010000
}

_eram = 0x20000000 + 0x00020000;

/* Section Definitions */ 
SECTIONS 
{ 
    .text : 
    { 
	   	. = 0x00000000;
        /*KEEP(*(.isr_vector .isr_vector.*))*/
        KEEP(*(.min_isr_vector .min_isr_vector.*)) 
        *(.text .text.* .gnu.linkonce.t.*) 	      
        *(.glue_7t) *(.glue_7)		                
        *(.rodata .rodata* .gnu.linkonce.r.*)		    	                  
    } > rom
    
    .ARM.extab : 
    {
        *(.ARM.extab* .gnu.linkonce.armextab.*)
    } > rom
    
    __exidx_start = .;
    .ARM.exidx :
    {
        *(.ARM.exidx* .gnu.linkonce.armexidx.*)
    } > rom
    __exidx_end = .;
    
    . = ALIGN(4); 
    _etext = .;
    _sidata = .; 
    		
    .data : AT (_etext) 
    { 
        _sdata = .; 
        *(.data .data.*) 
        . = ALIGN(4); 
        _edata = . ;
    } > ram

    /* .bss section which is used for uninitialized data */ 
    .bss (NOLOAD) : 
    { 
        _sbss = . ; 
        *(.bss .bss.*) 
        *(COMMON) 
        . = ALIGN(4); 
        _ebss = . ; 
    } > ram
    
    /* stack section */
    .co_stack (NOLOAD):
    {
        . = ALIGN(8);
        *(.co_stack .co_stack.*)
    } > ccm
       
    . = ALIGN(4); 
    _end = . ; 
}