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finish fibseq #1

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finish fibseq #1

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8392e71
finish fibseq
tjjh89017 Jul 31, 2014
707c2d8
finish mutex impl
tjjh89017 Aug 1, 2014
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14 changes: 9 additions & 5 deletions lab-1/fib.s
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Original file line number Diff line number Diff line change
Expand Up @@ -15,19 +15,23 @@ fibonacci:

@ R4 = R0 - 0 (update flags)
@ if(R0 <= 0) goto .L3 (which returns 0)

subs r4, r0, #0
ble .L3
@ Compare R4 wtih 1
@ If R4 == 1 goto .L4 (which returns 1)

subs r0, r4, #1
beq .L4
@ R0 = R4 - 1
@ Recursive call to fibonacci with R4 - 1 as parameter

bl fibonacci
@ R5 = R0
@ R0 = R4 - 2
@ Recursive call to fibonacci with R4 - 2 as parameter

mov r5, r0
sub r0, r4, #2
bl fibonacci
@ R0 = R5 + R0 (update flags)

adds r0, r0, r5
pop {r3, r4, r5, pc} @EPILOG

@ END CODE MODIFICATION
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25 changes: 20 additions & 5 deletions lab-2/mutex.s
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Original file line number Diff line number Diff line change
Expand Up @@ -8,19 +8,34 @@
.global lock_mutex
.type lock_mutex, function
lock_mutex:
@ INSERT CODE BELOW

@ END CODE INSERT
@ INSERT CODE BELOW
ldr r1, =locked
.L1:
ldrex r2, [r0]
cmp r2, #0
bne .L2
strex r2, r1, [r0]
cmp r2, #0
beq .L1
dmb
bx lr
.L2:
wfe
b .L1
@ END CODE INSERT

.size lock_mutex, .-lock_mutex

.global unlock_mutex
.type unlock_mutex, function
unlock_mutex:
@ INSERT CODE BELOW

@ END CODE INSERT
ldr r1, =unlocked
dmb
str r1, [r0]
dsb
sev
@ END CODE INSERT
bx lr
.size unlock_mutex, .-unlock_mutex

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