米6体育平台手机版

SLAU132V October 2004 – February 2020

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4.3.8 Specifying Where to Allocate Sections in Memory

The compiler produces relocatable blocks of code and data. These blocks, called sections, are allocated in memory in a variety of ways to conform to a variety of system configurations. See Section 6.1.4 for a complete description of how the compiler uses these sections.

The compiler creates two basic kinds of sections: initialized and uninitialized. Table 4-1 summarizes the initialized sections. Table 4-2 summarizes the uninitialized sections.

Table 4-1 Initialized Sections Created by the Compiler

Name	Contents
.binit	Boot time copy tables (See the MSP430 Assembly Language Tools User's Guide for information on BINIT in linker command files.)
.mspabi.exidx	Index table for exception handling; read-only (see --exceptions option).
.mspabi.extab	Unwinding instructions for exception handling; read-only (see --exceptions option).
.data	Global and static non-const variables that are explicitly initialized.
.init_array	Table of constructors to be called at startup.
.name.load	Compressed image of section name; read-only (See the MSP430 Assembly Language Tools User's Guide for information on copy tables.)
.ovly	Copy tables other than boot time (.binit) copy tables. Read-only data.
.rodata	Global and static variables that have const qualifiers.
.TI.crctab	Generated CRC checking tables. Read-only data.
.TI.noinit	The pragma NOINIT causes a non-initailized variable to be placed in the .TI.noinit section. The default linker command file places this section with .bss. See Section 5.12.22 for details about the NOINIT and PERSISTENT pragmas.
.TI.persistent	The pragma PERSISTENT causes an initialized variable to be placed in the .TI.persistent section. The default linker command file places this section with .data.

Table 4-2 Uninitialized Sections Created by the Compiler

Name	Contents
.args	Linker-created section used to pass arguments from the command line of the loader to the program
.bss	Uninitialized global and static variables
.cio	Buffers for stdio functions from the run-time support library
.stack	Function call frame stack
.sysmem	Memory pool (heap) for dynamic memory allocation (malloc, etc)

When you link your program, you must specify where to allocate the sections in memory. In general, initialized sections are linked into ROM or RAM; uninitialized sections are linked into RAM.

The linker provides MEMORY and SECTIONS directives for allocating sections. For more information about allocating sections into memory, see the MSP430 Assembly Language Tools User's Guide.