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68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
#include "types.h"
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static void fatal (void)
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{
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for (;;);
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}
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static void none (void)
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{
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}
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/* Note: it is not reset */
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static __attribute__ ((naked))
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void entry (void)
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{
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asm volatile ("ldr r0, =__ram_end__\n\t"
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"ldr r1, =__main_stack_size__\n\t"
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"subs r0, r0, r1\n\t"
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"msr PSP, r0\n\t" /* Process (main routine) stack */
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"movs r0, #0\n\t"
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"ldr r1, =_bss_start\n\t"
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"ldr r2, =_bss_start\n"
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"0:\n\t"
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"cmp r1, r2\n\t"
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"bge 1f\n\t"
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"str r0, [r1]\n\t"
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"adds r1, r1, #4\n\t"
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"b 0b\n"
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"1:\n\t"
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"movs r0, #2\n\t" /* Switch to PSP */
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"msr CONTROL, r0\n\t"
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"isb\n\t"
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"movs r0, #0\n\t"
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"msr BASEPRI, r0\n\t" /* Enable interrupts */
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"cpsie i\n\t"
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"mov r1, r0\n\t"
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"bl main\n"
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"2:\n\t"
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"b 2b\n"
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: /* no output */ : /* no input */ : "memory");
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}
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typedef void (*handler)(void);
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extern uint8_t __ram_end__;
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extern void usb_interrupt_handler (void);
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handler vector_table[] __attribute__ ((section(".vectors"))) = {
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(handler)&__ram_end__,
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entry,
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fatal, /* nmi */
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fatal, /* hard fault */
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/* 10 */
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fatal, /* mem manage */
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fatal, /* bus fault */
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fatal, /* usage fault */
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none,
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/* 20 */
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none, none, none, none, none, none, none, none,
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/* 40 */
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none, none, none, none, none, none, none, none,
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/* 60 */
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none, none, none, none, none, none, none, none,
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/* 80 */
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none, none, none, none,
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/* 90 */
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usb_interrupt_handler,
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};
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