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Help on Improper fixup

Rudolf Waller

Dear Sirs,

My C Startup code is written in assembly and has those lines (copied from HARDCHA.LST):

------                 1803     ?PR?STARTUP1?HARDWARE_DRV_CH_ASM  SEGMENT CODE
------                 1804                     RSEG    ?PR?STARTUP1?HARDWARE_DRV_CH_ASM
...
00013A 020000     E    2212                     LJMP    ?C_START


LX51 linker shows:

*** ERROR L121: IMPROPER FIXUP
    MODULE:  .\Temp\HarDCha.obj (?HARDWARE_DRV_CH_ASM)
    SEGMENT: ?PR?STARTUP1?HARDWARE_DRV_CH_ASM
    OFFSET:  00013BH


The map file has:

MEMORY MAP OF MODULE:  .\Temp\TP_KIca.a03 (KERNEL)
START     STOP      LENGTH    ALIGN  RELOC    MEMORY CLASS   SEGMENT NAME
=========================================================================
* * * * * * * * * * *   C O D E   M E M O R Y   * * * * * * * * * * * * *

***   CODE BANK 0   ***
002700H   00277FH   000080H   BYTE   UNIT     CODE/B0        ?C_C51STARTUP
...
***   COMMON AREA   ***
001A68H   001BADH   000146H   BYTE   UNIT     CODE           ?PR?STARTUP1?HARDWARE_DRV_CH_ASM
...
PUBLIC SYMBOLS OF MODULE:  .\Temp\TP_KIca.a03 (KERNEL)
      VALUE       CLASS    TYPE      PUBLIC SYMBOL NAME
      =================================================
      0080273BH   CODE/B0  ---       ?C_START


Why this error happens? I'm using LJMP and LX51 can put a 16 bit address on 13BH address.

What's a meanning of "E" letter after 020000 on HARDCHA.LST?

Parents
  • 0 in reply to Andy Neil

    Yes.

    LX51 User's Guide:

    GENERAL: LOCATING IMPROPER FIXUP INSTRUCTIONS:

    CAUSE
    A fixup error is generated when it is impossible to generate an instruction address that reaches an operand. This is frequently the case with instructions that implement relative jumps or branches. Typically, improper fixups are caused by in-line assembly code that attempts to access an address that is too far away.

    LX51 can put destination address (273BH) on 2 byte of LJMP operand (address ?PR?STARTUP1?HARDWARE_DRV_CH_ASM + 013BH).

Reply
  • 0 in reply to Andy Neil

    Yes.

    LX51 User's Guide:

    GENERAL: LOCATING IMPROPER FIXUP INSTRUCTIONS:

    CAUSE
    A fixup error is generated when it is impossible to generate an instruction address that reaches an operand. This is frequently the case with instructions that implement relative jumps or branches. Typically, improper fixups are caused by in-line assembly code that attempts to access an address that is too far away.

    LX51 can put destination address (273BH) on 2 byte of LJMP operand (address ?PR?STARTUP1?HARDWARE_DRV_CH_ASM + 013BH).

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