米6体育平台手机版

SLAU131V October 2004 – February 2020

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2.7 Symbolic Relocations

The assembler treats each section as if it began at address 0. Of course, all sections cannot actually begin at address 0 in memory, so the linker must relocate sections. Relocations are symbol-relative rather than section-relative.

The linker can relocate sections by:

Allocating them into the memory map so that they begin at the appropriate address as defined with the linker's MEMORY directive
Adjusting symbol values to correspond to the new section addresses
Adjusting references to relocated symbols to reflect the adjusted symbol values

The linker uses relocation entries to adjust references to symbol values. The assembler creates a relocation entry each time a relocatable symbol is referenced. The linker then uses these entries to patch the references after the symbols are relocated. Example 3 contains a code fragment for a MSP430 device for which the assembler generates relocation entries.