Programming Forums > Application Development > Assembly

elmo · Oct 12th, 2004, 3:41 AM

Alright, at school we're using the LC3 compiler (Little computer i assume) for assembly, and have some assignments for it.
Problem:
Cant figure out how to save *anything* into a pointer.

example:

(Toggle Plain Text)

...
LEA R2, P; R2 should be a pointer to P now
...
A  .STRINGZ "A"
P  .BLKW 10; should be a pointer with 10 slots

now, no matter what i try, i cant seem to be able to store anything in any of the
pointers location, tried with ST, STI, but it seems like it wont do anything.
Could someone provide me with a example to store 'A' into one of the memory locations of P, using R2?

professor63 · Mar 3rd, 2005, 11:31 AM

The problem is to write a program to store the character 'A' that is pointed to by base address 'A' into the memory location pointed to by the base address 'P' .

.ORIG x3000
LEA R2, P
LEA R1, A
LDR R0,R1,#0
STR R0,R2,#0
HALT
A .STRINGZ "A"
P .BLKW 10
.END

Oct 12th, 2004, 3:41 AM	#1
elmo Newbie Join Date: Oct 2004 Posts: 4 Rep Power: 0	Alright, at school we're using the LC3 compiler (Little computer i assume) for assembly, and have some assignments for it. Problem: Cant figure out how to save anything into a pointer. example: (Toggle Plain Text) ... LEA R2, P; R2 should be a pointer to P now ... A .STRINGZ "A" P .BLKW 10; should be a pointer with 10 slots ... LEA R2, P; R2 should be a pointer to P now ... A .STRINGZ "A" P .BLKW 10; should be a pointer with 10 slots now, no matter what i try, i cant seem to be able to store anything in any of the pointers location, tried with ST, STI, but it seems like it wont do anything. Could someone provide me with a example to store 'A' into one of the memory locations of P, using R2?

Mar 3rd, 2005, 11:31 AM	#2
professor63 Newbie Join Date: Mar 2005 Posts: 1 Rep Power: 0	Pointers in LC3 The problem is to write a program to store the character 'A' that is pointed to by base address 'A' into the memory location pointed to by the base address 'P' . .ORIG x3000 LEA R2, P LEA R1, A LDR R0,R1,#0 STR R0,R2,#0 HALT A .STRINGZ "A" P .BLKW 10 .END

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Programming Forums > Application Development > Assembly

[lc3] Lc3 Pointer Help