86 lines
2.6 KiB
ArmAsm
86 lines
2.6 KiB
ArmAsm
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; -- _____ ______ _____ -
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; -- |_ _| | ____|/ ____| -
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; -- | | _ __ | |__ | (___ Institute of Embedded Systems -
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; -- | | | '_ \| __| \___ \ Zurich University of -
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; -- _| |_| | | | |____ ____) | Applied Sciences -
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; -- |_____|_| |_|______|_____/ 8401 Winterthur, Switzerland -
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; ------------------------------------------------------------------
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; --
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; -- arithm.s
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; --
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; -- CT1 P05 Summe und Differenz
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; --
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; -- $Id: arithm.s 549 2014-09-01 13:00:11Z muln $
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; ------------------------------------------------------------------
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;Directives
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PRESERVE8
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THUMB
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; ------------------------------------------------------------------
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; -- myCode
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; ------------------------------------------------------------------
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AREA MyCode, CODE, READONLY
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main PROC
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EXPORT main
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user_prog
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; ------------------------------------------------------------------
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; -- Increment/Decrement with ADDS and SUBS
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MOVS R1, #0
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ADDS R1, R1, #1
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ADDS R1, R1, #1
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SUBS R1, R1, #1
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SUBS R1, R1, #1
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SUBS R1, R1, #1
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SUBS R1, R1, #1
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SUBS R1, R1, #1
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ADDS R1, R1, #1
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ADDS R1, R1, #1
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ADDS R1, R1, #1
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ADDS R1, R1, #1
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ADDS R1, R1, #1
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; ------------------------------------------------------------------
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; -- ADDS and SUBS (negative, positive, overflow)
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LDR R0, =0x6a000000
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LDR R1, =0x2efffffe
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ADDS R1, R1, R1
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ADDS R0, R0, R1
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ADDS R0, R0, R1
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LDR R0, =0xa1000000
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LDR R1, =0x5efffffe
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SUBS R0, R0, R1
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SUBS R0, R0, R1
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; ------------------------------------------------------------------
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; -- ADDS and RSBS vs. SUBS (compare R0 and R2)
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LDR R0, =0x4a000000
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LDR R1, =0x2efffffe
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MOV R2, R0
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SUBS R0, R0, R1
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RSBS R1, R1, #0
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ADDS R2, R2, R1
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; ------------------------------------------------------------------
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; -- MUL flags and cut-off if result needs more than 32 bits
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LDR R0, =0x0000e200
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LDR R1, =0x00002201
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MULS R0, R1, R0
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LDR R1, =0x00000f20
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MULS R0, R1, R0
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MULS R0, R1, R0
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B user_prog
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ALIGN
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; ------------------------------------------------------------------
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; End of code
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; ------------------------------------------------------------------
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ENDP
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END
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