swi.rar_swi_swi软中断

/*********swi*************/ /* copyright(asm/c) lixiaochun@upth.cn * date 2005-1-20 * description: software interrupt for RAM ***************************/ #include <stdio.h> #include "swi.h" unsigned *swi_vec = (unsigned *)0x08; extern void SWI_Handler(void); unsigned Install_Handler( unsigned routine, unsigned *vector ) { unsigned vec, old_vec; vec = (routine - (unsigned)vector - 8) >> 2; if (vec & 0xff000000) { printf("Handler greater than 32MBytes from vector"); } vec = 0xea000000 | vec; /**//* OR in 'branch always' code */ old_vec = *vector; *vector = vec; return (old_vec); } int main( void ) { int result1, result2; struct four_results res_3; Install_Handler( (unsigned) SWI_Handler, swi_vec ); printf("result1 = multiply_two( 2, 4 ) = %d ", result1 = multiply_two( 2, 4 )); printf("result2 = multiply_two( 3, 6 ) = %d ", result2 = multiply_two( 3, 6 )); printf("add_two( result1, result2 ) = %d ", add_two( result1, result2 )); printf("add_multiply_two( 2, 4, 3, 6 ) = %d ", add_multiply_two( 2, 4, 3, 6 )); res_3 = many_operations( 12, 4, 3, 1 ); printf("res_3.a = %d ", res_3.a ); printf("res_3.b = %d ", res_3.b ); printf("res_3.c = %d ", res_3.c ); printf("res_3.d = %d ", res_3.d ); return 0; }