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Diffstat (limited to '')
| -rw-r--r-- | lab7bonus_fig4.s | 29 |
1 files changed, 0 insertions, 29 deletions
diff --git a/lab7bonus_fig4.s b/lab7bonus_fig4.s deleted file mode 100644 index 35e20e0..0000000 --- a/lab7bonus_fig4.s +++ /dev/null @@ -1,29 +0,0 @@ - MOV R6,stack_begin - LDR R6,[R6] // initialize stack pointer - MOV R4, result // R4 contains address of result - MOV R3,#0 - STR R3,[R4] // result = 0; - MOV R0,#1 // R0 contains first parameter - MOV R1,#5 // R1 contains second parameter - MOV R2,#9 // R2 contains third parameter - MOV R3,#20 // R3 contains fourth parameter - BL leaf_example // call leaf_example(1,5,9,20); - STR R0,[R4] // result = leaf_example(1,5,9,20); - HALT -leaf_example: - STR R4,[R6] // save R4 for use afterwards - STR R5,[R6,#-1] // save R5 for use afterwards - ADD R4,R0,R1 // R4 = g + h - ADD R5,R2,R3 // R5 = i + j - MVN R5,R5 // R5 = ~(i + j) - ADD R4,R4,R5 // R4 = (g + h) + ~(i + j) - MOV R5,#1 - ADD R4,R4,R5 // R4 = (g + h) - (i + j) - MOV R0,R4 // R0 = return value (g + h) - (i + j) - LDR R5,[R6,#-1] // restore saved contents of R5 - LDR R4,[R6] // restore saved contents of R4 - BX R7 // return control to caller -stack_begin: - .word 0xFF -result: - .word 0xCCCC |