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.syntax unified
.thumb
.section .vector_table, "a"
.word __stack_top /* Initial stack pointer */
.word _start /* Reset Handler */
.word _hang /* Non Maskable Interrupts */
.word _hang /* Hard Fault */
.word _hang /* Memory Management Fault */
.word _hang /* Bus Fault */
.word _hang /* Usage Fault */
.skip 16 /* Reserved */
.word _hang /* SVCall */
.skip 8 /* Reserved */
.word _hang /* PendSV */
.word _hang /* SysTick */
.text
.align
.thumb_func
_start:
/* Zero init BSS */
_bss_init_start:
/* BSS section start and end addresses are 4-bytes aligned thanks to the linker script */
ldr r0, =__bss_start
ldr r1, =__bss_end
mov r2, #0
_bss_init_loop:
cmp r0, r1
beq _bss_init_end
str r2, [r0], #4
b _bss_init_loop
_bss_init_end:
/* Init data section */
_data_init_start:
/* Data section start and end addresses are also 4-bytes aligned */
ldr r0, =__data_lma
ldr r1, =__data_start
ldr r2, =__data_end
__data_init_loop:
cmp r1, r2
beq _data_init_end
ldr r4, [r0], #4
ldr r4, [r1], #4
b __data_init_loop
_data_init_end:
/* Reset all general purpose registers */
mov r0, #0
mov r1, #0
mov r2, #0
mov r3, #0
mov r4, #0
mov r5, #0
mov r6, #0
mov r7, #0
mov r8, #0
mov r9, #0
mov r10, #0
mov r11, #0
mov r12, #0
bl main
_hang:
b .
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