米6体育平台手机版

SLAU131V October 2004 – February 2020

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Example 3. Code That Generates Relocation Entries

       1            ** Generating Relocation Entries **
       2                    
       3                    .ref X
       4                    .def Y
       5            
       6 000000               .text
       7 000000 5A0B          ADD.W   R10, R11
       8 000002 4B82          MOV.W   R11, &X
         000004 0000!
       9 000006 4030          BR      #Y
         000008 000A!
      10            
      11 00000a 5B0C  Y       ADD.W   R11, R12

In Example 3, both symbols X and Y are relocatable. Y is defined in the .text section of this module; X is defined in another module. When the code is assembled, X has a value of 0 (the assembler assumes all undefined external symbols have values of 0), and Y has a value of 8. The assembler generates two relocation entries: one for X and one for Y. The reference to X is an external reference and the reference to Y is to an internally defined relocatable symbol (both are indicated by the ! character in the listing).

After the code is linked, suppose that X is relocated to address 0x0800. Suppose also that the .text section is relocated to begin at address 0x0600; Y now has a relocated value of 0x0608. The linker uses the relocation entry for the reference to X to patch the branch instruction in the object code:

4B820000! becomes 4B820800