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IT arm asm

mosfet mosfet
Note: This was originally posted on 14th December 2009 at http://forums.arm.com

Hi,

When disassembling with IDA an arm binary I can see the following:

__text:000049CA                 RSBS.W  R3, R2, #1    ;R3 = 1 - var_height
__text:000049CE                 IT CC
__text:000049D0                 MOVCC   R3, #0
__text:000049D2                 CMP     R0, #0
__text:000049D4                 ITE NE
__text:000049D6                 MOVNE   R4, R3
__text:000049D8                 ORREQ.W R4, R3, #1
__text:000049DC                 MOV     R5, R0

I cannot find references about IT/ITE opcode, where can I find it ?

Thanks
Parents
  • Note: This was originally posted on 15th December 2009 at http://forums.arm.com

    Hi,

    When disassembling with IDA an arm binary I can see the following:

    __text:000049CA                 RSBS.W  R3, R2, #1    ;R3 = 1 - var_height
    __text:000049CE                 IT CC
    __text:000049D0                 MOVCC   R3, #0
    __text:000049D2                 CMP     R0, #0
    __text:000049D4                 ITE NE
    __text:000049D6                 MOVNE   R4, R3
    __text:000049D8                 ORREQ.W R4, R3, #1
    __text:000049DC                 MOV     R5, R0

    I cannot find references about IT/ITE opcode, where can I find it ?

    Thanks


    Hi,mosfet

        IT means "If-Then",it is a 16-bit new thumb instruction after ARM-v6T2,ARM-v7 architecture.
    you can find it in Cortex-M3 reference maunal or ARM-v7 reference maunal,or Thumb instructions reference maunal.

        best regards!
Reply
  • Note: This was originally posted on 15th December 2009 at http://forums.arm.com

    Hi,

    When disassembling with IDA an arm binary I can see the following:

    __text:000049CA                 RSBS.W  R3, R2, #1    ;R3 = 1 - var_height
    __text:000049CE                 IT CC
    __text:000049D0                 MOVCC   R3, #0
    __text:000049D2                 CMP     R0, #0
    __text:000049D4                 ITE NE
    __text:000049D6                 MOVNE   R4, R3
    __text:000049D8                 ORREQ.W R4, R3, #1
    __text:000049DC                 MOV     R5, R0

    I cannot find references about IT/ITE opcode, where can I find it ?

    Thanks


    Hi,mosfet

        IT means "If-Then",it is a 16-bit new thumb instruction after ARM-v6T2,ARM-v7 architecture.
    you can find it in Cortex-M3 reference maunal or ARM-v7 reference maunal,or Thumb instructions reference maunal.

        best regards!
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