SLAU131V User guide | 德州仪器 TI.com.cn

SLAU131V October 2004 – February 2020

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4.8.8 Substitution Symbols

Symbols can be assigned a string value. This enables you to create aliases for character strings by equating them to symbolic names. Symbols that represent character strings are called substitution symbols. When the assembler encounters a substitution symbol, its string value is substituted for the symbol name. Unlike symbolic constants, substitution symbols can be redefined.

A string can be assigned to a substitution symbol anywhere within a program; for example:

    .asg   "SP", stack-pointer
       ; Assigns the string SP to the substitution symbol
       ; stack-pointer.
    .asg   "#0x20", block2
       ; Assigns the string #0x20 to the substitution
       ; symbol block2.
    ADD   block2, stack-pointer
       ; Adds the value in SP to #0x20 and stores the
       ; result in SP.

When you are using macros, substitution symbols are important because macro parameters are actually substitution symbols that are assigned a macro argument. The following code shows how substitution symbols are used in macros:

myadd  .macro src, dest
          ; addl macro definition
       ADD src, dest
          ; Add the value in register dest to the value in
          ; register src.
       .endm

*myadd invocation
       myadd R4, R5
          ; Calls the macro addl and substitutes R4 for src
          ; and R5 for dest. The macro adds the value of R4
          ; and the value of R5.

See Section 6 for more information about macros.