Manage Automatic Storage Dynamically via Modify Automatic Storage Allocation (MODASA)

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Learn the fantastic automatic storage frame (ASF)-operating MI instruction and the implementation details behind it.


From the point of view of a programmer, the ability to change the automatic storage allocation at run time would be fabulous. Automatic storage is thread-private storage; therefore, in a multi-threaded environment you don't need to worry about thread synchronization when you store your program variables in automatic storage. Automatic storage is managed by the system for each individual invocation stack (call stack) entry, so you can simply forget the automatic storage that you have allocated after the end of the invocation. No free operation of the allocated automatic storage is needed.


As an IBM i developer, you can be proud of the fact that you've had the ability to manage automatic storage dynamically (at run time) since System/38. And what makes this ability available for us is the Modify Automatic Storage Allocation (MODASA) MI instruction.

Manage Automatic Storage Dynamically via the MODASA MI Instruction

The Modify Automatic Storage Allocation (MODASA) MI instruction is documented in the IBM i 7.1 Information Center as follows:


Op Code (Hex)

Operand 1

Operand 2


Storage allocation

Modification size

Operand 1: Space pointer data object   or null.

Operand 2: Signed binary scalar.




Bound program   access

Built-in number for MODASA is 159.


         modification_size : signed binary(4) OR   unsigned binary(4)

) : space pointer(16) to a storage   allocation


where 0 < modification size <=   16,773,119.


The modification size operand   corresponds to operand 2 on the MODASA operation;

the return value corresponds to   operand 1.




The automatic storage frame (ASF) of the current invocation is extended or truncated by the modification size specified by operand 2. A positive value indicates that the frame is to be extended; a negative value indicates that the frame is to be truncated; a zero value does not change the ASF. If operand 1 is not null, it will be treated as follows:


  1. ASF extension: receives the address of the first byte of the extension. The ASF extension might not be contiguous with the remainder of the ASF allocation.
  2. ASF truncation: operand 1 should be null for truncation. If operand 1 is not null, then addressability to the first byte of the deallocated space is returned. This value should not be used as a space pointer since it locates space that has been deallocated.
  3. If a value of zero is specified for operand 2: the value returned is unpredictable.


When the ASF is extended, the extension is aligned on a 16-byte boundary. An extension is not initialized.


When the ASF is extended by this instruction, the type of storage, either single level store or teraspace, always matches the existing ASF.


A scalar value invalid (hex 3203) exception is signaled if the truncation amount would include the storage for all automatic data objects for the current invocation, including the initial allocation.


A space pointer machine object cannot be specified for operand 1.


Note that, as mentioned above, when being invoked from a bound program (ILE program), the modification size operand must be a positive value. If it's not, a scalar value invalid (hex 3203) exception (aka MCH5003) is signaled. In other words, the MODASA MI instruction cannot be used for automatic storage truncation in an ILE program.


Another exception to be aware of is the automatic storage overflow (hex 2C1D) (aka MCH4429) exception. An attempt to allocate automatic storage above the limit of the automatic stack will raise the hex 2C1D exception. The limit on the size of the automatic stack of a thread in an MI process is documented in the Machine Managed Storage Limits subsection of the Storage Limitations section of Machine Interface Architecture Introduction. Note that these limitation values have changed in the past releases of IBM i. For example, the maximum teraspace automatic stack size of the initial thread of an MI process is 64 MB and 1G-8M in VRM540 and VRM710, respectively.


Consideration should also be given to the storage model selected for your program that uses the MODASA MI instruction, since the storage modelsingle-level store (SLS) or teraspaceof your program determines the storage of the automatic stackSLS or teraspaceused by your program. As shown above, when the ASF is extended by this instruction, the type of storage, either SLS or teraspace, always matches the existing ASF. You determine the storage model of a program by the Storage model (STGMDL) parameter of the Create command (CRTPGM, CRTBNDRPG, CRTBNDCL, etc.) you used to create the program object.


And finally, a 16 MB SLS segment is allocated for each thread in an MI process as its automatic stack. Thus, program variables allocated in the SLS automatic stack are thread-safe by nature. By contrast, it is possible for one thread to see or change the automatic variables allocated in the teraspace automatic stack of another thread, since the teraspace is visible to all threads within an MI process.

Examples of Using the MODASA MI Instruction

The following code samples are the source of an OMI program (asa01.emi), an ILE RPG program (asa02.rpgle), and an ILE C program (asa03.c). They demonstrate how to extend the ASF (or in other words, allocate automatic storage) of the current invocation at run time. OMI program ASA01 also invokes MODASA to truncate the ASF.



brk     '1'                     ;

       modasa p@, 95         ; /* ASF extention */

brk     '2'                     ;

       modasa p@, -95         ; /* ASF truncation */

brk     'END'                    ;

       rtx     *               ;

dcl spcptr p@ auto             ;

pend                           ;



     h dftactgrp(*no)


     /if defined(HAVE_I5TOOLKIT)

     /copy mih-pgmexec



     * @BIF _MODASA (Modify Automatic   Storage Allocation (MODASA))


     * @remark Note that unlike MI   instruction MODASA, builtin

     *         _MODASA cannot be used to truncate   ASF. Passing a

     *         negative value to _MODASA will raise   a Scalar Value

     *         Invalid exception (3203)


     d modasa         pr             *   extproc('_MODASA')

     d       mod_size                 10u 0   value



     d auto_buf       s           256a     based(auto@)


           auto@ = modasa(%size(auto_buf));

           // @var auto_buf is now available   for use


           *inlr = *on;




# include <stdlib.h>


# pragma linkage(_MODASA,   builtin)

void *_MODASA(int);


void *p = NULL;


int asa_op() {

p = _MODASA(95);

return 255;



int main() {


return 0;



More examples of using the MODASA MI instruction can be found in the IBM i Information Center (e.g., Example: Common MI programming techniques) or here (e.g., t133.rpgle, which retrieves UPS information via the MATMATR MI instruction).

Implementation Details Behind the MODASA MI Instruction

To understand the implementation details behind the MODASA MI instruction, you should start with the user code generated for a program or procedure that invokes MODASA. The PowerPC instruction stream generated (at VRM540) for the modasa p@, 95 MI instruction (which extends the ASF) in OMI program asa01.emi might look like the following:



     000084     3860005F         ADDI 3,0,95           01 [1]

     000088     4B800983         BLA   0X3800980         [2]

     00008C   7C0103E6         SETTAG                 [4]

     000090     E8408110         LD   2,0X8110(0)         [3]

     000094     786001E4         RLDICR   0,3,0,39

     000098     E8808118         LD 4,0X8118(0)

     00009C   2C200000         CMPI 0,1,0,0

     0000A0     7882131E         SELRR 2,4,2,38

     0000A4   F85E0052         STQ 2,0X50(30)         [4]



  1. Operand 2 (of value 95) of MODASA is set in General Purpose Register (GPR) 3 (i.e., r3) by the Add Immediate instruction ADDI 3,0,95.
  2. Branch to absolute address FFFFFFFFFF 800980 with the Link Register (LR) set to the effective address (EA) of the instruction following instruction BLA 0X3800980. Address FFFFFFFFFF 800980 is within the text section of LIC module #cfgrbla and the instruction at address FFFFFFFFFF 800980, ba 0x2131520, simply branches to absolute address FFFFFFFFFE 131520, which is the start of the LIC module that actually implements the ASF extension aimodasa1. aimodasa1 implements its task, stores the address of the start of the new ASF extension in r3, and returns to the user code via the bclr 20,0 instruction (branch unconditionally to the effective address saved in LR).
  3. After returning from aimodasa1, the 8-byte address (stored in r3) of the new ASF extension is tested for validity. If the higher 5 byte segment (Segment ID (SID) portion) of the returned address is hex 0000000000, it is regarded as an invalid address and the higher 8 bytes (the pointer type bytes) of the resulting 16-byte MI pointer are set to hex AF00000000000000 (meaning an invalid MI pointer). Otherwise, the pointer type bytes are set to hex 8000000000000000, which indicates an MI space pointer.
  4. Finally the STQ 2,0X50(30) instruction in conjunction with the previous SETTAG instruction store the 8-byte pointer type bytes and the returned address of the new ASF extension stored in r2 and r3 to the resulting 16-byte MI space pointer in storage and make sure tag bits of the MI pointer are set properly.


As for the details of how the LIC module aimodasa1 implements an ASF extension, I decided not to explain the LIC module instruction by instruction. If you really love the system, you can investigate the PowerPC instructions of the LIC module aimodasa1 yourself via tools such as the System Service Tools (SST). Generally speaking, tasks of the LIC module aimodasa1 include rounding the input ASF extension value (stored in r3) to a 32-byte boundary, checking the extension value for validity (e.g., the extension value should be neither zero nor negative, and the extension value should not be greater than the maximum value of a single ASF extension), increasing r31 (which always addresses the end of ASF of the current invocation) by the rounded extension value to extend the ASF, and returning the old value of r31 to its caller as the address of the new ASF extension via r3.


For detailed documentation about the PowerPC instruction set, please refer to the Assembler language reference in the AIX Information Center. The Programming Environments Manual for 64-bit Microprocessors would be a nice reference for the PowerPC architecture. Also note that instructions such as SETTAG (Set Tag), SELRR, and STQ (Store Quad Word) are IBM i-specific PowerPC instructions. I've never found public documentation about these instructions. However, they have been discussed by several AS/400 gurus in the MI400 mailing list.


One additional point to mention is that in the user code generated for an ILE program that invokes the _MODASA system built-in (e.g., asa02.rpgle or asa03.c), the returned ASF address (after extension) is also checked for a teraspace address. If the higher 4 bits of the returned address is equal to hex 9, the 8-byte pointer type bytes of the result MI space pointer is set to hex 4000000000000000, which indicates a teraspace pointer.


The user code generated (at VRM540) for the modasa p@, -95 MI instruction (which truncates the ASF) in OMI program asa01.emi is the following:



     0000A8   389E0040         ADDI 4,30,64           02

     0000AC   3860FFA1         ADDI 3,0,-95

     0000B0     4B80098B         BLA 0X3800988

     0000B4     7C0103E6         SETTAG

     0000B8     E8808110         LD 4,0X8110(0)

     0000BC     786001E4         RLDICR   0,3,0,39

     0000C0   E8408118         LD 2,0X8118(0)

     0000C4   2C200000         CMPI 0,1,0,0

     0000C8   7842231E         SELRR 2,2,4,38

     0000CC     F85E0052         STQ 2,0X50(30)


The important difference in the user code generated for MI instruction modasa p@, -95 is the LIC module being invoked. The bla 0X3800988 instruction branches to the absolute address FFFFFFFFFF 800988, where a ba 0x22170a0 instruction branches to the target LIC module aimodasa2 at address FFFFFFFFFE 2170A0. The aimodasa2 module truncates the ASF by decreasing r31 with the rounded truncation value stored in r3 and returns the old value of r31 via r3. As mentioned in MODASA's document, "This value should not be used as a space pointer since it locates space that has been deallocated."


Junlei Li

Junlei Li is a programmer from Tianjin, China, with 10 years of experience in software design and programming. Junlei Li began programming under i5/OS (formerly known as AS/400, iSeries) in late 2005. He is familiar with most programming languages available on i5/OS—from special-purpose languages such as OPM/ILE RPG to CL to general-purpose languages such as C, C++, Java; from strong-typed languages to script languages such as QShell and REXX. One of his favorite programming languages on i5/OS is machine interface (MI) instructions, through which one can discover some of the internal behaviors of i5/OS and some of the highlights of i5/OS in terms of operating system design.


Junlei Li's Web site is, where his open-source project i5/OS Programmer's Toolkit ( is documented.



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    SB PowerTech WC GenericIn this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

    Don't miss this chance to take your knowledge of IBM i security beyond the basics.



  • 5 IBM i Security Quick Wins

    SB PowerTech WC GenericIn today’s threat landscape, upper management is laser-focused on cybersecurity. You need to make progress in securing your systems—and make it fast.
    There’s no shortage of actions you could take, but what tactics will actually deliver the results you need? And how can you find a security strategy that fits your budget and time constraints?
    Join top IBM i security expert Robin Tatam as he outlines the five fastest and most impactful changes you can make to strengthen IBM i security this year.
    Your system didn’t become unsecure overnight and you won’t be able to turn it around overnight either. But quick wins are possible with IBM i security, and Robin Tatam will show you how to achieve them.

  • How to Meet the Newest Encryption Requirements on IBM i

    SB PowerTech WC GenericA growing number of compliance mandates require sensitive data to be encrypted. But what kind of encryption solution will satisfy an auditor and how can you implement encryption on IBM i? Watch this on-demand webinar to find out how to meet today’s most common encryption requirements on IBM i. You’ll also learn:

    • Why disk encryption isn’t enough
    • What sets strong encryption apart from other solutions
    • Important considerations before implementing encryption



  • Security Bulletin: Malware Infection Discovered on IBM i Server!

    SB PowerTech WC GenericMalicious programs can bring entire businesses to their knees—and IBM i shops are not immune. It’s critical to grasp the true impact malware can have on IBM i and the network that connects to it. Attend this webinar to gain a thorough understanding of the relationships between:

    • Viruses, native objects, and the integrated file system (IFS)
    • Power Systems and Windows-based viruses and malware
    • PC-based anti-virus scanning versus native IBM i scanning

    There are a number of ways you can minimize your exposure to viruses. IBM i security expert Sandi Moore explains the facts, including how to ensure you're fully protected and compliant with regulations such as PCI.



  • Fight Cyber Threats with IBM i Encryption

    SB PowerTech WC GenericCyber attacks often target mission-critical servers, and those attack strategies are constantly changing. To stay on top of these threats, your cybersecurity strategies must evolve, too. In this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access




  • 10 Practical IBM i Security Tips for Surviving Covid-19 and Working From Home

    SB PowerTech WC GenericNow that many organizations have moved to a work from home model, security concerns have risen.

    During this session Carol Woodbury will discuss the issues that the world is currently seeing such as increased malware attacks and then provide practical actions you can take to both monitor and protect your IBM i during this challenging time.


  • How to Transfer IBM i Data to Microsoft Excel

    SB_HelpSystems_WC_Generic3 easy ways to get IBM i data into Excel every time
    There’s an easy, more reliable way to import your IBM i data to Excel? It’s called Sequel. During this webinar, our data access experts demonstrate how you can simplify the process of getting data from multiple sources—including Db2 for i—into Excel. Watch to learn how to:

    • Download your IBM i data to Excel in a single step
    • Deliver data to business users in Excel via email or a scheduled job
    • Access IBM i data directly using the Excel add-in in Sequel

    Make 2020 the year you finally see your data clearly, quickly, and securely. Start by giving business users the ability to access crucial business data from IBM i the way they want it—in Microsoft Excel.



  • HA Alternatives: MIMIX Is Not Your Only Option on IBM i

    SB_HelpSystems_WC_GenericIn this recorded webinar, our experts introduce you to the new HA transition technology available with our Robot HA software. You’ll learn how to:

    • Transition your rules from MIMIX (if you’re happy with them)
    • Simplify your day-to-day activities around high availability
    • Gain back time in your work week
    • Make your CEO happy about reducing IT costs

    Don’t stick with a legacy high availability solution that makes you uncomfortable when transitioning to something better can be simple, safe, and cost-effective.



  • Node Webinar Series Pt. 1: The World of Node.js on IBM i

    SB Profound WC GenericHave you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application.
    Part 1 will teach you what Node.js is, why it's a great option for IBM i shops, and how to take advantage of the ecosystem surrounding Node.
    In addition to background information, our Director of Product Development Scott Klement will demonstrate applications that take advantage of the Node Package Manager (npm).
    Watch Now.

  • The Biggest Mistakes in IBM i Security

    SB Profound WC Generic The Biggest Mistakes in IBM i Security
    Here’s the harsh reality: cybersecurity pros have to get their jobs right every single day, while an attacker only has to succeed once to do incredible damage.
    Whether that’s thousands of exposed records, millions of dollars in fines and legal fees, or diminished share value, it’s easy to judge organizations that fall victim. IBM i enjoys an enviable reputation for security, but no system is impervious to mistakes.
    Join this webinar to learn about the biggest errors made when securing a Power Systems server.
    This knowledge is critical for ensuring integrity of your application data and preventing you from becoming the next Equifax. It’s also essential for complying with all formal regulations, including SOX, PCI, GDPR, and HIPAA
    Watch Now.

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  • Backup and Recovery on IBM i: Your Strategy for the Unexpected

    SB HelpSystems SC 5413Robot automates the routine tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:
    - Simplified backup procedures
    - Easy data encryption
    - Save media management
    - Guided restoration
    - Seamless product integration
    Make sure your data survives when catastrophe hits. Try the Robot Backup and Recovery Solution FREE for 30 days.

  • Manage IBM i Messages by Exception with Robot

    SB HelpSystems SC 5413Managing messages on your IBM i can be more than a full-time job if you have to do it manually. How can you be sure you won’t miss important system events?
    Automate your message center with the Robot Message Management Solution. Key features include:
    - Automated message management
    - Tailored notifications and automatic escalation
    - System-wide control of your IBM i partitions
    - Two-way system notifications from your mobile device
    - Seamless product integration
    Try the Robot Message Management Solution FREE for 30 days.

  • Easiest Way to Save Money? Stop Printing IBM i Reports

    SB HelpSystems SC 5413Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing.
    Manage your reports with the Robot Report Management Solution. Key features include:

    - Automated report distribution
    - View online without delay
    - Browser interface to make notes
    - Custom retention capabilities
    - Seamless product integration
    Rerun another report? Never again. Try the Robot Report Management Solution FREE for 30 days.

  • Hassle-Free IBM i Operations around the Clock

    SB HelpSystems SC 5413For over 30 years, Robot has been a leader in systems management for IBM i.
    Manage your job schedule with the Robot Job Scheduling Solution. Key features include:
    - Automated batch, interactive, and cross-platform scheduling
    - Event-driven dependency processing
    - Centralized monitoring and reporting
    - Audit log and ready-to-use reports
    - Seamless product integration
    Scale your software, not your staff. Try the Robot Job Scheduling Solution FREE for 30 days.

  • ACO MONITOR Manages your IBM i 24/7 and Notifies You When Your IBM i Needs Assistance!

    SB DDL Systems 5429More than a paging system - ACO MONITOR is a complete systems management solution for your Power Systems running IBM i. ACO MONITOR manages your Power System 24/7, uses advanced technology (like two-way messaging) to notify on-duty support personnel, and responds to complex problems before they reach critical status.

    ACO MONITOR is proven technology and is capable of processing thousands of mission-critical events daily. The software is pre-configured, easy to install, scalable, and greatly improves data center efficiency.