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https://salsa.debian.org/gnuk-team/gnuk/gnuk.git
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93 lines
2.2 KiB
C
93 lines
2.2 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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/*
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* Note: the address of this routine 'entry' will be in the vectors as
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* RESET, but this will be called from application. It's not RESET
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* state, then.
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*
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* This routine doesn't change PSP and MSP. Application should
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* prepare those stack pointers.
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*/
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static __attribute__ ((naked,section(".text.entry")))
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void entry (void)
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{
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asm volatile ("mov r0, pc\n\t"
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"bic r0, r0, #255\n\t" /* R0 := vector_table address */
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"mov r1, #0x90\n\t" /* R1 := numbers of entries * 4 */
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"ldr r3, .L01\n" /* R3 := -0x20001400 fixed addr */
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"0:\n\t"
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"ldr r2, [r0, r1]\n\t"
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"add r2, r0\n\t" /* Relocate: R0 - 0x20001400 */
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"add r2, r3\n\t"
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"str r2, [r0, r1]\n\t"
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"subs r1, r1, #4\n\t"
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"bne 0b\n\t"
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/* Relocation done. */
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"add r0, r3\n\t"
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"ldr r3, .L00\n"
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".LPIC00:\n\t"
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"add r3, pc\n\t" /* R3 := @_GLOBAL_OFFSET_TABLE_ */
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/* Compute the address of BSS. */
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"ldr r4, .L00+4\n\t"
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"ldr r1, [r3, r4]\n\t"
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"add r1, r0\n\t" /* relocate bss_start */
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"ldr r4, .L00+8\n\t"
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"ldr r2, [r3, r4]\n"
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"add r2, r0\n\t" /* relocate bss_end */
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/* Clear BSS. */
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"mov r0, #0\n\t"
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"0:\n\t"
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"str r0, [r1], #4\n\t"
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"cmp r2, r1\n\t"
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"bhi 0b\n\t"
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"cpsie i\n\t" /* Enable interrupts */
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"mov r0, #0\n\t"
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"mov r1, r0\n\t"
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"bl main\n"
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"1:\n\t"
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"b 1b\n\t"
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".align 2\n"
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".L01:\n\t"
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".word -0x20001400\n"
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".L00:\n\t"
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".word _GLOBAL_OFFSET_TABLE_-(.LPIC00+4)\n\t"
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".word _bss_start(GOT)\n\t"
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".word _bss_end(GOT)"
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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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