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Controlling the Linking Process
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4.3.6 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.
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
.cinit
Tables for explicitly initialized global and static variables
.const
Global and static const variables that are explicitly initialized and contain string
literals. String literals, other than those used in an array initializer, are placed in the
.const:.string subsection to enable greater link-time placement control.
.pinit
Table of constructors to be called at startup
.text
Executable code and constants
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
Global and static variables
.stack
Primary stack
.sysmem
Memory for malloc functions (heap)
.sysstack
Secondary system stack
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. See
Section 6.1.4 for a complete description of how the compiler uses these sections.
The linker provides MEMORY and SECTIONS directives for allocating sections. For more information
about allocating sections into memory, see the TMS320C55x Assembly Language Tools User's Guide.
Allocating Sections
NOTE: When allocating sections, keep in mind that the .stack and .sysstack sections must be on the
same 64K-word data page. Also, only code sections and huge-model data sections are
allowed to cross page boundaries.
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Linking C/C++ Code
Copyright © 2011, Texas Instruments Incorporated
SPRU281G – December 2011
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