This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Why does ARMSim# not recognize instruction 'addw'?

Robert over 10 years ago

Hi,

For the below code, ARMSim# does not recognize '.arch armv7-r'. It says:
"unknown opcode or directive: .arch"It does not recognize 'addw' either, says:
"unknown opcode or directive: addw"I have check ARMTRM. 'addw' is a legal assembly code.
'.arch' is also used in some assembler.
How do you think ARMSim# want?
Thanks.
////////////////////
.arch armv7-r
.syntax unified
.text
.thumb
        .global foo
foo:
@ Section A6.1.3 "Use of 0b1101 as a register specifier".@ R13 as the source or destination register of a mov instruction.
@ only register to register transfers without shifts are supported,
@ with no flag settingmov        sp,r0
mov        r0,sp@ Using the following instructions to adjust r13 up or down by a
@ multiple of 4:add        sp,sp,#0
addw        sp,sp,#0

0 Yasuhiko Koumoto over 10 years ago

Hello,
I am not familiar with ARMSim# but it would be a simulator for ARM7TDMI processor according to a search engine.
Is there ARMv7 version?
If it was the ARM7TDMII simulator, the "addw" would not be supported because it is a Thumb-2 instruction.
If it supported the ARMv7, the "addw" notation would be "add.w", I think.
Best regards,
Yasuhiko Koumoto.
Cancel
Vote up 0 Vote down

Cancel
0 Yasuhiko Koumoto over 10 years ago in reply to Robert

Hello,
ARMv5 does not support Thumb-2 but only supports Thumb.
Best regards,
Yasuhiko Koumoto.
Cancel
Vote up 0 Vote down

Cancel
0 Robert over 10 years ago in reply to Yasuhiko Koumoto

Hi,
Your answer is right.
Although the help window of ARMSim# says ARMv5, its user manual says that it is ARM7TDMI processor.
Thanks,
Cancel
Vote up 0 Vote down

Cancel