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Why ARM7TDMI cannot interpret arm code ?

Offline arlo lin over 9 years ago

Note: This was originally posted on 18th November 2011 at http://forums.arm.com

arm assembly code : 0xFA000EAE
the instruction code fail to run when i settle the code on ARM7TDMI,throught trace32 powerview,i can see that,
the code is interpreted as undef ,but it's blx on ARM926EJ.

i think that both ARM7TDMI and ARM926EJ support ARMv5 instruction set, why it cannot be known on ARM7TDMI???

does anybody get a clue about this? thanks a lot ...

ARM7TDMI
code              mnemonic                        comment
....
E3A00F42    mov   r0,#0x108
FA000EAE    undef 0xFA000EAE
....
----------------------------------------------------------------------------------------------------------------
ARM926EJ
code              mnemonic         comment
....
E3A00F42    mov   r0,#0x108
FA000EAE    blx 0x3AF0        ;MShell_Calloc
....

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Offline Joseph Yiu over 9 years ago

Note: This was originally posted on 18th November 2011 at http://forums.arm.com

Hi there,

ARM7TDMI is architecture v4T, not v5TE. So, sorry, no BLX support on ARM7TDMI.
(See http://en.wikipedia.org/wiki/List_of_ARM_microprocessor_cores)

regards,
Joseph
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Offline Joseph Yiu over 9 years ago

Note: This was originally posted on 18th November 2011 at http://forums.arm.com

Hi there,

ARM7TDMI is architecture v4T, not v5TE. So, sorry, no BLX support on ARM7TDMI.
(See http://en.wikipedia.org/wiki/List_of_ARM_microprocessor_cores)

regards,
Joseph
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