?? asm1_b.s
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#*********************************************************************************************
# NAME: asm1_a.s *
# Author: Embest *
# Desc: ARM instruction examples *
# History: shw.He 2005.02.22 *
#*********************************************************************************************
/*------------------------------------------------------------------------------------------*/
/* constant define */
/*------------------------------------------------------------------------------------------*/
.equ x, 45 /* x=45 */
.equ y, 64 /* y=64 */
.equ z, 87 /* z=87 */
.equ stack_top, 0x1000 /* define the top address for stacks */
.global _start
/*------------------------------------------------------------------------------------------*/
/* code */
/*------------------------------------------------------------------------------------------*/
.text
_start: /* code start */
mov r0, #x /* put x value into R0 */
mov r0, r0, lsl #8 /* R0 = R0 << 8 */
mov r1, #y /* put y value into R1 */
add r2, r0, r1, lsr #1 /* R2 = (R1>>1) + R0 */
MOV sp, #0x1000
STR r2, [sp]
mov r0, #z /* put z value into R0 */
and r0, r0, #0xFF /* get low 8 bit from R0 */
mov r1, #y /* put y value into R1 */
add r2, r0, r1, lsr #1 /* R2 = (R1>>1) + R0 */
LDR r0, [sp] /* put y value into R1 */
MOV r1, #0x01
ORR r0, r0, r1
mov r1, R2 /* put y value into R1 */
add r2, r0, r1, lsr #1 /* R2 = (R1>>1) + R0 */
stop:
b stop /* end the code ，cycling*/
.end
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