SPRU513Z
August 2001 – October 2023
SM320F28335-EP
1
Read This First
About This Manual
How to Use This Manual
Notational Conventions
Related Documentation From Texas Instruments
Trademarks
1
Introduction to the Software Development Tools
1.1
Software Development Tools Overview
1.2
Tools Descriptions
2
Introduction to Object Modules
2.1
Object File Format Specifications
2.2
Executable Object Files
2.3
Introduction to Sections
2.3.1
Special Section Names
2.4
How the Assembler Handles Sections
2.4.1
Uninitialized Sections
2.4.2
Initialized Sections
2.4.3
User-Named Sections
2.4.4
Current Section
2.4.5
Section Program Counters
2.4.6
Subsections
2.4.7
Using Sections Directives
2.5
How the Linker Handles Sections
2.5.1
Combining Input Sections
2.5.2
Placing Sections
2.6
Symbols
2.6.1
Global (External) Symbols
2.6.2
Local Symbols
2.6.3
Weak Symbols
2.6.4
The Symbol Table
2.7
Symbolic Relocations
2.7.1
Expressions With Multiple Relocatable Symbols (COFF Only)
2.8
Loading a Program
3
Program Loading and Running
3.1
Loading
3.1.1
Load and Run Addresses
3.1.2
Bootstrap Loading
3.1.2.1
Boot, Load, and Run Addresses
3.1.2.2
Primary Bootloader
3.1.2.3
Secondary Bootloader
3.1.2.4
Boot Table
3.1.2.5
Bootloader Routine
3.1.2.5.1
Sample Secondary Bootloader Routine
3.2
Entry Point
3.3
Run-Time Initialization
3.3.1
The _c_int00 Function
3.3.2
RAM Model vs. ROM Model
3.3.2.1
Autoinitializing Variables at Run Time (--rom_model)
3.3.2.2
Initializing Variables at Load Time (--ram_model)
3.3.2.3
The --rom_model and --ram_model Linker Options
3.3.3
About Linker-Generated Copy Tables
3.3.3.1
BINIT
3.3.3.2
CINIT
3.4
Arguments to main
3.5
Run-Time Relocation
3.6
Additional Information
4
Assembler Description
4.1
Assembler Overview
4.2
The Assembler's Role in the Software Development Flow
4.3
Invoking the Assembler
4.4
Controlling Application Binary Interface
4.5
Naming Alternate Directories for Assembler Input
4.5.1
Using the --include_path Assembler Option
4.5.2
Using the C2000_A_DIR Environment Variable
4.6
Source Statement Format
4.6.1
Label Field
4.6.2
Mnemonic Field
4.6.3
Operand Field
4.6.4
Comment Field
4.7
Literal Constants
4.7.1
Integer Literals
4.7.1.1
Binary Integer Literals
4.7.1.2
Octal Integer Literals
4.7.1.3
Decimal Integer Literals
4.7.1.4
Hexadecimal Integer Literals
4.7.1.5
Character Literals
4.7.2
Character String Literals
4.7.3
Floating-Point Literals
4.8
Assembler Symbols
4.8.1
Identifiers
4.8.2
Labels
4.8.3
Local Labels
4.8.3.1
Local Labels of the Form $n
85
4.8.3.2
Local Labels of the Form name?
87
4.8.4
Symbolic Constants
4.8.5
Defining Symbolic Constants (--asm_define Option)
4.8.6
Predefined Symbolic Constants
4.8.7
Registers
4.8.8
Substitution Symbols
4.9
Expressions
4.9.1
Mathematical and Logical Operators
4.9.2
Relational Operators and Conditional Expressions
4.9.3
Well-Defined Expressions
4.9.4
Legal Expressions
4.10
Built-in Functions and Operators
4.10.1
Built-In Math and Trigonometric Functions
4.11
TMS320C28x Assembler Extensions
4.11.1
C28x Support
4.11.2
C28x FPU32 and FPU64 Extensions
4.11.3
C28x CLA Extensions
4.12
Source Listings
4.13
Debugging Assembly Source
4.14
Cross-Reference Listings
4.15
Smart Encoding
4.16
Pipeline Conflict Detection
4.16.1
Protected and Unprotected Pipeline Instructions
4.16.2
Pipeline Conflict Prevention and Detection
4.16.3
Pipeline Conflicts Detected
5
Assembler Directives
5.1
Directives Summary
5.2
Directives that Define Sections
5.3
Directives that Initialize Values
5.4
Directives that Perform Alignment and Reserve Space
5.5
Directives that Format the Output Listings
5.6
Directives that Reference Other Files
5.7
Directives that Enable Conditional Assembly
5.8
Directives that Define Union or Structure Types
5.9
Directives that Define Enumerated Types
5.10
Directives that Define Symbols at Assembly Time
5.11
Miscellaneous Directives
5.12
Directives Reference
.align
.asg/.define/.eval
.asmfunc/.endasmfunc
.bits
.bss
.byte/.ubyte/.char/.uchar
.cdecls
.clink
.common
.copy/.include
.cstruct/.cunion/.endstruct/.endunion/.tag
.data
.drlist/.drnolist
.elfsym
.emsg/.mmsg/.wmsg
.end
.fclist/.fcnolist
.field
.float/.xfloat/.xldouble
.global/.def/.ref
.group/.gmember/.endgroup
.if/.elseif/.else/.endif
.int/.unint/.word/.uword
.label
.length/.width
.list/.nolist
.long/.ulong/.xlong
.loop/.endloop/.break
.macro/.endm
.mlib
.mlist/.mnolist
.newblock
.option
.page
.retain / .retainrefs
.sblock
.sect
.set
.space/.bes
.sslist/.ssnolist
.string/.cstring/.pstring
.struct/.endstruct/.tag
.symdepend
.tab
.text
.title
.unasg/.undefine
.union/.endunion/.tag
.usect
.var
.weak
6
Macro Language Description
6.1
Using Macros
6.2
Defining Macros
6.3
Macro Parameters/Substitution Symbols
6.3.1
Directives That Define Substitution Symbols
6.3.2
Built-In Substitution Symbol Functions
6.3.3
Recursive Substitution Symbols
6.3.4
Forced Substitution
6.3.5
Accessing Individual Characters of Subscripted Substitution Symbols
6.3.6
Substitution Symbols as Local Variables in Macros
6.4
Macro Libraries
6.5
Using Conditional Assembly in Macros
6.6
Using Labels in Macros
6.7
Producing Messages in Macros
6.8
Using Directives to Format the Output Listing
6.9
Using Recursive and Nested Macros
6.10
Macro Directives Summary
7
Archiver Description
7.1
Archiver Overview
7.2
The Archiver's Role in the Software Development Flow
7.3
Invoking the Archiver
7.4
Archiver Examples
7.5
Library Information Archiver Description
7.5.1
Invoking the Library Information Archiver
7.5.2
Library Information Archiver Example
7.5.3
Listing the Contents of an Index Library
7.5.4
Requirements
8
Linker Description
8.1
Linker Overview
8.2
The Linker's Role in the Software Development Flow
8.3
Invoking the Linker
8.4
Linker Options
8.4.1
Wildcards in File, Section, and Symbol Patterns
8.4.2
Specifying C/C++ Symbols with Linker Options
8.4.3
Relocation Capabilities (--absolute_exe and --relocatable Options)
8.4.3.1
Producing an Absolute Output Module (--absolute_exe option)
8.4.3.2
Producing a Relocatable Output Module (--relocatable option)
8.4.4
Allocate Memory for Use by the Loader to Pass Arguments (--arg_size Option)
8.4.5
Compression (--cinit_compression and --copy_compression Option)
8.4.6
Compress DWARF Information (--compress_dwarf Option)
8.4.7
Control Linker Diagnostics
8.4.8
Automatic Library Selection (--disable_auto_rts Option)
8.4.9
Disable Conditional Linking (--disable_clink Option)
8.4.10
Do Not Remove Unused Sections (--unused_section_elimination Option)
8.4.11
Linker Command File Preprocessing (--disable_pp, --define and --undefine Options)
8.4.12
Error Correcting Code Testing (--ecc Options)
8.4.13
Define an Entry Point (--entry_point Option)
8.4.14
Set Default Fill Value (--fill_value Option)
8.4.15
Define Heap Size (--heap_size Option)
8.4.16
Hiding Symbols
8.4.17
Alter the Library Search Algorithm (--library, --search_path, and C2000_C_DIR )
8.4.17.1
Name an Alternate Library Directory (--search_path Option)
8.4.17.2
Name an Alternate Library Directory ( C2000_C_DIR Environment Variable)
8.4.17.3
Exhaustively Read and Search Libraries (--reread_libs and --priority Options)
8.4.18
Change Symbol Localization
8.4.18.1
Make All Global Symbols Static (--make_static Option)
8.4.19
Create a Map File (--map_file Option)
8.4.20
Manage Map File Contents (--mapfile_contents Option)
8.4.21
Disable Name Demangling (--no_demangle)
8.4.22
Disable Merging of Symbolic Debugging Information (--no_sym_merge Option)
8.4.23
Strip Symbolic Information (--no_symtable Option)
8.4.24
Name an Output Module (--output_file Option)
8.4.25
Prioritizing Function Placement (--preferred_order Option)
8.4.26
C Language Options (--ram_model and --rom_model Options)
8.4.27
Retain Discarded Sections (--retain Option)
8.4.28
Create an Absolute Listing File (--run_abs Option)
8.4.29
Scan All Libraries for Duplicate Symbol Definitions (--scan_libraries)
8.4.30
Define Stack Size (--stack_size Option)
8.4.31
Mapping of Symbols (--symbol_map Option)
8.4.32
Introduce an Unresolved Symbol (--undef_sym Option)
8.4.33
Display a Message When an Undefined Output Section Is Created (--warn_sections)
8.4.34
Generate XML Link Information File (--xml_link_info Option)
8.4.35
Zero Initialization (--zero_init Option)
8.5
Linker Command Files
8.5.1
Reserved Names in Linker Command Files
8.5.2
Constants in Linker Command Files
8.5.3
Accessing Files and Libraries from a Linker Command File
8.5.4
The MEMORY Directive
8.5.4.1
Default Memory Model
8.5.4.2
MEMORY Directive Syntax
8.5.4.3
Expressions and Address Operators
8.5.5
The SECTIONS Directive
8.5.5.1
SECTIONS Directive Syntax
8.5.5.2
Section Allocation and Placement
8.5.5.2.1
Example: Placing Functions in RAM
8.5.5.2.2
Binding
8.5.5.2.3
Named Memory
8.5.5.2.4
Controlling Placement Using The HIGH Location Specifier
8.5.5.2.4.1
Linker Placement With the HIGH Specifier
265
8.5.5.2.4.2
Linker Placement Without HIGH Specifier
8.5.5.2.5
Alignment and Blocking
8.5.5.2.6
Alignment With Padding
8.5.5.2.7
Using the Page Method
8.5.5.3
Specifying Input Sections
8.5.5.3.1
The Most Common Method of Specifying Section Contents
272
8.5.5.4
Using Multi-Level Subsections
8.5.5.5
Specifying Library or Archive Members as Input to Output Sections
8.5.5.5.1
Archive Members to Output Sections
276
8.5.5.6
Allocation Using Multiple Memory Ranges
8.5.5.7
Automatic Splitting of Output Sections Among Non-Contiguous Memory Ranges
8.5.6
Placing a Section at Different Load and Run Addresses
8.5.6.1
Specifying Load and Run Addresses
281
8.5.6.2
Referring to the Load Address by Using the .label Directive
8.5.7
Using GROUP and UNION Statements
8.5.7.1
Grouping Output Sections Together
8.5.7.2
Overlaying Sections With the UNION Statement
8.5.7.3
Using Memory for Multiple Purposes
8.5.7.4
Nesting UNIONs and GROUPs
8.5.7.5
Checking the Consistency of Allocators
8.5.7.6
Naming UNIONs and GROUPs
8.5.8
Overlaying Pages
8.5.8.1
Using the MEMORY Directive to Define Overlay Pages
8.5.8.2
Example of Overlay Pages
8.5.8.2.1
MEMORY Directive With Overlay Pages
294
8.5.8.3
Using Overlay Pages With the SECTIONS Directive
8.5.8.3.1
SECTIONS Directive Definition for Overlays
297
8.5.8.4
Memory Allocation for Overlaid Pages
8.5.9
Special Section Types (DSECT, COPY, NOLOAD, and NOINIT)
8.5.10
Configuring Error Correcting Code (ECC) with the Linker
8.5.10.1
Using the ECC Specifier in the Memory Map
8.5.10.2
Using the ECC Directive
8.5.10.3
Using the VFILL Specifier in the Memory Map
8.5.11
Assigning Symbols at Link Time
8.5.11.1
Syntax of Assignment Statements
8.5.11.2
Assigning the SPC to a Symbol
8.5.11.3
Assignment Expressions
8.5.11.4
Symbols Automatically Defined by the Linker
8.5.11.5
Assigning Exact Start, End, and Size Values of a Section to a Symbol
8.5.11.6
Why the Dot Operator Does Not Always Work
8.5.11.7
Address and Dimension Operators
8.5.11.7.1
Input Items
8.5.11.7.2
Output Section
8.5.11.7.3
GROUPs
8.5.11.7.4
UNIONs
8.5.11.8
LAST Operator
8.5.12
Creating and Filling Holes
8.5.12.1
Initialized and Uninitialized Sections
8.5.12.2
Creating Holes
8.5.12.3
Filling Holes
8.5.12.4
Explicit Initialization of Uninitialized Sections
8.6
Linker Symbols
8.6.1
Linker-Defined Functions and Arrays
8.6.2
Linker-Defined Integer Values
8.6.3
Linker-Defined Addresses
8.6.4
More About the _symval Operator
8.6.5
Weak Symbols
8.6.5.1
Weak Symbol References
8.6.5.2
Weak Symbol Definitions
8.6.6
Resolving Symbols with Object Libraries
8.7
Default Placement Algorithm
8.7.1
How the Allocation Algorithm Creates Output Sections
8.7.2
Reducing Memory Fragmentation
8.8
Using Linker-Generated Copy Tables
8.8.1
Using Copy Tables for Boot Loading
8.8.2
Using Built-in Link Operators in Copy Tables
8.8.3
Overlay Management Example
8.8.4
Generating Copy Tables With the table() Operator
8.8.4.1
The table() Operator
8.8.4.2
Boot-Time Copy Tables
8.8.4.3
Using the table() Operator to Manage Object Components
8.8.4.4
Linker-Generated Copy Table Sections and Symbols
8.8.4.5
Splitting Object Components and Overlay Management
8.8.5
Compression
8.8.5.1
Compressed Copy Table Format
8.8.5.2
Compressed Section Representation in the Object File
8.8.5.3
Compressed Data Layout
8.8.5.4
Run-Time Decompression
8.8.5.5
Compression Algorithms
350
8.8.6
Copy Table Contents
8.8.7
General Purpose Copy Routine
8.9
Linker-Generated CRC Tables and CRC Over Memory Ranges
8.9.1
Using the crc_table() Operator in the SECTIONS Directive
8.9.1.1
Restrictions when using the crc_table() Operator
8.9.1.2
Examples
8.9.1.2.1
Using crc_table() Operator to Compute the CRC Value for .text Data
358
8.9.1.2.2
Specifying an Algorithm in the crc_table() Operator
360
8.9.1.2.3
Using a Single Table for Multiple Sections
362
8.9.1.2.4
Applying the crc_table() Operator to a GROUP or UNION
364
8.9.1.3
Interface When Using the crc_table() Operator
8.9.1.3.1
The CRC Table Header, crc_tbl.h
8.9.2
Using the crc() Operator in the MEMORY Directive
8.9.2.1
Restrictions when Using the crc() Operator
8.9.2.2
Using the VFILL Specifier within a GROUP
8.9.2.3
Generate CRC for Most or All of Flash Memory
8.9.2.4
Computing CRCs for Both Memory Ranges and Sections
8.9.2.5
Example Specifying Memory Range CRCs
8.9.2.6
Interface When Using the crc() Operator
8.9.3
A Special Note Regarding 16-Bit char
8.10
Partial (Incremental) Linking
8.11
Linking C/C++ Code
8.11.1
Run-Time Initialization
8.11.2
Object Libraries and Run-Time Support
8.11.3
Setting the Size of the Stack and Heap Sections
8.11.4
Initializing and AutoInitialzing Variables at Run Time
8.12
Linker Example
9
Absolute Lister Description
9.1
Producing an Absolute Listing
9.2
Invoking the Absolute Lister
9.3
Absolute Lister Example
10
Cross-Reference Lister Description
10.1
Producing a Cross-Reference Listing
10.2
Invoking the Cross-Reference Lister
10.3
Cross-Reference Listing Example
11
Object File Utilities
11.1
Invoking the Object File Display Utility
11.2
Invoking the Disassembler
11.3
Invoking the Name Utility
11.4
Invoking the Strip Utility
12
Hex Conversion Utility Description
12.1
The Hex Conversion Utility's Role in the Software Development Flow
12.2
Invoking the Hex Conversion Utility
12.2.1
Invoking the Hex Conversion Utility From the Command Line
12.2.2
Invoking the Hex Conversion Utility With a Command File
12.3
Understanding Memory Widths
12.3.1
Target Width
12.3.2
Specifying the Memory Width
12.3.3
Partitioning Data Into Output Files
12.3.4
Specifying Word Order for Output Words
12.4
The ROMS Directive
12.4.1
When to Use the ROMS Directive
12.4.2
An Example of the ROMS Directive
12.5
The SECTIONS Directive
12.6
The Load Image Format (--load_image Option)
12.6.1
Load Image Section Formation
12.6.2
Load Image Characteristics
12.7
Excluding a Specified Section
12.8
Assigning Output Filenames
12.9
Image Mode and the --fill Option
12.9.1
Generating a Memory Image
12.9.2
Specifying a Fill Value
12.9.3
Steps to Follow in Using Image Mode
12.10
Array Output Format
12.11
Building a Table for an On-Chip Boot Loader
12.11.1
Description of the Boot Table
12.11.2
The Boot Table Format
12.11.3
How to Build the Boot Table
12.11.3.1
Building the Boot Table
12.11.3.2
Leaving Room for the Boot Table
12.11.4
Booting From a Device Peripheral
12.11.5
Setting the Entry Point for the Boot Table
12.11.6
Using the C28x Boot Loader
12.11.6.1
Sample Command File for Booting From 8-Bit SPI Boot
429
12.11.6.2
Sample Command File for C28x 16-Bit Parallel Boot GP I/O
431
12.11.6.3
Sample Command File for Booting From 8-Bit SCI Boot
433
12.12
Using Secure Flash Boot on TMS320F2838x Devices
12.13
Controlling the ROM Device Address
12.14
Control Hex Conversion Utility Diagnostics
12.15
Description of the Object Formats
12.15.1
ASCII-Hex Object Format (--ascii Option)
12.15.2
Intel MCS-86 Object Format (--intel Option)
12.15.3
Motorola Exorciser Object Format (--motorola Option)
12.15.4
Extended Tektronix Object Format (--tektronix Option)
12.15.5
Texas Instruments SDSMAC (TI-Tagged) Object Format (--ti_tagged Option)
12.15.6
TI-TXT Hex Format (--ti_txt Option)
12.15.6.1
TI-TXT Object Format
12.16
Hex Conversion Utility Error Messages
13
Sharing C/C++ Header Files With Assembly Source
13.1
Overview of the .cdecls Directive
13.2
Notes on C/C++ Conversions
13.2.1
Comments
13.2.2
Conditional Compilation (#if/#else/#ifdef/etc.)
13.2.3
Pragmas
13.2.4
The #error and #warning Directives
13.2.5
Predefined symbol __ASM_HEADER__
13.2.6
Usage Within C/C++ asm( ) Statements
13.2.7
The #include Directive
13.2.8
Conversion of #define Macros
13.2.9
The #undef Directive
13.2.10
Enumerations
13.2.11
C Strings
13.2.12
C/C++ Built-In Functions
13.2.13
Structures and Unions
13.2.14
Function/Variable Prototypes
13.2.15
C Constant Suffixes
13.2.16
Basic C/C++ Types
13.3
Notes on C++ Specific Conversions
13.3.1
Name Mangling
13.3.2
Derived Classes
13.3.3
Templates
13.3.4
Virtual Functions
13.4
Special Assembler Support
13.4.1
Enumerations (.enum/.emember/.endenum)
13.4.2
The .define Directive
13.4.3
The .undefine/.unasg Directives
13.4.4
The $defined( ) Built-In Function
13.4.5
The $sizeof Built-In Function
13.4.6
Structure/Union Alignment and $alignof( )
13.4.7
The .cstring Directive
A Symbolic Debugging Directives
A.1 DWARF Debugging Format
A.2 Debug Directive Syntax
B XML Link Information File Description
B.1 XML Information File Element Types
B.2 Document Elements
B.2.1 Header Elements
B.2.2 Input File List
B.2.3 Object Component List
B.2.4 Logical Group List
B.2.5 Placement Map
B.2.6 Symbol Table
C CRC Reference Implementation
C.1 Compilation Instructions
C.2 Reference CRC Calculation Routine
C.2.1 Reference Implementation of a CRC Calculation Function: ref_crc.c
C.3 Linker-Generated Copy Tables and CRC Tables
C.3.1 Main Routine for Example Application: main.c
C.3.2 Checking CRC Values: check_crc.c
C.3.3 Task1 Routine: task1.c
C.3.4 Task2 Routine: task2.c
C.3.5 Task3 Routine: task3.c
C.3.6 Example 1 Command File: ex1.cmd (for COFF)
D Glossary
D.1 Terminology
E Revision History
User's Guide
TMS320C28x Assembly Language Tools
v22.6.0.LTS