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assembler function: warning: padding bytes

Lars Berger

Hi,

using this assembler function in my c-code, I will get a warning message from the keil µvision compiler (warning: A1581W: added 2 bytes of padding at address 0xe)

 __asm void jump_to_application(void)
{
    ; program stack pointer of application
    LDR     R0, =0x10000
    LDR     SP, [R0]

    ; extract entry point into application
    LDR     R0, =0x10004

    ; jump
    LDR     PC, [R0]
}

Which steps do I have to add to solve this warning message?

best regards
Lars

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  • 0 in reply to Jimmy

    This warning is telling you that the assembler is doing something that you did not specifically instruct it to do, but is likely going to be very helpful to you.  Probably asking the assembler to specifically do what it is doing is the best way to remove the warning.  You want to add the ALIGN keyword to the AREA directive.  The Assembler aligning your data to a 4 byte boundary.  To officially ask it to align to a 4 byte boundary, add the ALIGN=2 to the AREA directive.  Often AREA's are aligned to 8-byte boundary with ALIGN=3 and I would suggest you do this unless you specially understand why you would want to make it different.

    AREA CUBE_lut, DATA, READWRITE, ALIGN=2

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  • 0 in reply to Jimmy

    This warning is telling you that the assembler is doing something that you did not specifically instruct it to do, but is likely going to be very helpful to you.  Probably asking the assembler to specifically do what it is doing is the best way to remove the warning.  You want to add the ALIGN keyword to the AREA directive.  The Assembler aligning your data to a 4 byte boundary.  To officially ask it to align to a 4 byte boundary, add the ALIGN=2 to the AREA directive.  Often AREA's are aligned to 8-byte boundary with ALIGN=3 and I would suggest you do this unless you specially understand why you would want to make it different.

    AREA CUBE_lut, DATA, READWRITE, ALIGN=2

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