Consider the following ARM assembly code: function1: push {r4-r10, fp} fp,sp,#28 add // allocate local variable space // r4=r0+r1 // r5=r2+r3 // r6=r4+r5 // A=r4 add sp,sp,#-4 r4,r0,rl r5,r2,r3 r6,r4,r5 r6,[fp,#-32] r0,[fp, #-32] // rl=A sp,fp,#28 {r4-r10,fp} lr add add add str 1dr sub pop bx For the given ARM code, what is the minimal set of registers that must be saved by the routine "function1" a) {r4-r5} b) {r4-г6; c) {r4} d) {r4-r10}

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Consider the following ARM assembly code:
function1: push {r4-r10, fp}
fp,sp,#28
add
sp,sp,#-4
r4,r0,r1
r5,r2,r3
r6,r4,r5
r6, [fp,#-32]
r0,[fp, #-32] // r1=A
sp,fp,#28
{r4-r10,fp}
lr
// allocate local variable space
// r4=r0+rl
// r5=r2+r3
// r6=r4+r5
// A=r4
add
add
add
add
str
ldr
sub
pop
bx
For the given ARM code, what is the minimal set of registers that must be saved by the routine
"function1"
a) {r4-r5}
b) {r4-r6}
c) {r4}
d) {r4-r10}
Transcribed Image Text:Consider the following ARM assembly code: function1: push {r4-r10, fp} fp,sp,#28 add sp,sp,#-4 r4,r0,r1 r5,r2,r3 r6,r4,r5 r6, [fp,#-32] r0,[fp, #-32] // r1=A sp,fp,#28 {r4-r10,fp} lr // allocate local variable space // r4=r0+rl // r5=r2+r3 // r6=r4+r5 // A=r4 add add add add str ldr sub pop bx For the given ARM code, what is the minimal set of registers that must be saved by the routine "function1" a) {r4-r5} b) {r4-r6} c) {r4} d) {r4-r10}
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