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DSP Discussion Groups High Performance Digital Signal Processing - C6000 RUN_ADRESS and other linker command myTI_0391262 - 03:08am Sep 29, 2004 CST hi, I would like to use the linker command command run adress. So I've defined my text sections and my new .cmd file as below: SECTIONS { UNION: run = ISRAM, LOAD_START(_union_load_adresse), LOAD_SIZE(_size_totale_union), RUN_SIZE(_size_max_union), RUN_START (_adresse_run) { .section1: load = SDRAM .section2: load = SDRAM } } When I look at my .map file generated at compilation, I can check that .section1 and .section2 are not overlayed in SDRAM and have the same run adress in the "Attibutes/input sections " column. My idea was to move one function dynamically during the program execution by a memcpy: memcpy(adresse_run, <function>,(int)size_max_union); The issue is that both sections are placed together at the run adress in ISRAM when I execute the program, and this before any memcpy. So I can diffrentiate them. Can somebody help me ? thanks |
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RUN_ADRESS and other linker command
Started by ●September 29, 2004
Reply by ●September 29, 20042004-09-29
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bdnremi- What is your target? Where is the MEMORY directive in your linker command file? C6000 has many different memory architectures, unless you are specific about your problem there is a scope for misleading answers from us because we would be only guessing. Anyways here are some clues: 1] The assembly language users guide has a good example on memory overlay techniques along with a complete linker command file. Did you try that? 2] Memory diective: When you are loading and running from the same location, there are no issues- the linker/loader will bind all the sections very well even in a single named memory region one section after another based on a default algorithm. When you are trying to do run time relocation you need to make sure that the sections *inside* the union do not get *loaded* into the same named memory region. Remember the overlay is only at run-time and not at load time. At load time you need to make sure one section doesnt overwrite another, Does that make sense? Anyways, Iam kind of guessing that your probleme here is with your memory directive. My guess is that in your case section2 is overwriting section1 during load time. >.section1: load = SDRAM >.section2: load = SDRAM This shd be probably changed to: >.section1: load = SDRAM1 >.section2: load = SDRAM2 Assume, SDRAM1 starts at 8000 0000 and SDRAM2 starts at 8000 FFFF. Now Section2 doesnt overwrite Section1. let me know if it helps. --Bhooshan ----Original Message Follows---- From: "bdnremi" <> To: Subject: [c6x] RUN_ADRESS and other linker command Date: Wed, 29 Sep 2004 09:52:06 -0000 DSP Discussion Groups High Performance Digital Signal Processing - C6000 RUN_ADRESS and other linker command myTI_0391262 - 03:08am Sep 29, 2004 CST hi, I would like to use the linker command command run adress. So I've defined my text sections and my new .cmd file as below: SECTIONS { UNION: run = ISRAM, LOAD_START(_union_load_adresse), LOAD_SIZE(_size_totale_union), RUN_SIZE(_size_max_union), RUN_START (_adresse_run) { .section1: load = SDRAM .section2: load = SDRAM } } When I look at my .map file generated at compilation, I can check that .section1 and .section2 are not overlayed in SDRAM and have the same run adress in the "Attibutes/input sections " column. My idea was to move one function dynamically during the program execution by a memcpy: memcpy(adresse_run, <function>,(int)size_max_union); The issue is that both sections are placed together at the run adress in ISRAM when I execute the program, and this before any memcpy. So I can diffrentiate them. Can somebody help me ? thanks _____________________________________ Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer. You need to do a "reply all" if you want your answer to be distributed to the entire group. _____________________________________ About this discussion group: To Join: Send an email to To Post: Send an email to To Leave: Send an email to Archives: http://www.yahoogroups.com/group/c6x Other Groups: http://www.dsprelated.com Yahoo! Groups Links _________________________________________________________________ Is your PC infected? Get a FREE online computer virus scan from McAfee Security. http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid963 |
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Reply by ●September 30, 20042004-09-30
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Sorry for the details I've forgotten: - my target is DM642. - I read the Assembly Language User uide to write the modified .cmd file, but I couldn't find any details about my issue I think it's not a problem in the load time, but rather I think I do a misuse of the RUN_START linker command. Let me explain: I'm sure that the sections are not overlayed during the load time, because I check the .map file, before the program execution. Each sections has its own adress in the SDRAM (nevertheless I tried youe solution with 2 SDRAMs, but I didn't have better result) Here is the part of the .map file (in this exmaple each section is just one function which returns recpectively 1 end 2): output attributes/ section page origin length input sections -------- ---- ---------- ---------- ---------------- .section1 * 0 81006a00 00000020 RUN ADDR = 000003e0 81006a00 00000020 essai_MBAFF.obj(.section1) .section2 * 0 81006a20 00000020 RUN ADDR = 000003e0 81006a20 00000020 essai_MBAFF.obj(.section2) In the column "attributes" you can see that the run adress is the same as I specified by the Union statement in the .cmd file Here is my problem: I would like that this run adress would be a adress where I can move dynamically one of the two functions during the execution. Actually, when I run the program and stop it by a break point before the call of one of the two functions, I see that the adress of function in section1 is the same as the one of function in section1 and botha are equal to RUN_ADDR. I don't want that the relocation in the run-time adress becomes automatically. Do you see what I mean ? Thanks a lot --- In , "Bhooshan iyer" <bhooshaniyer@h...> wrote: > bdnremi- > > What is your target? Where is the MEMORY directive in your linker command > file? > C6000 has many different memory architectures, unless you are specific about > your problem there is a scope for misleading answers from us because we > would be only guessing. Anyways here are some clues: > > 1] The assembly language users guide has a good example on memory overlay > techniques along with a complete linker command file. Did you try that? > > 2] Memory diective: > > When you are loading and running from the same location, there are no > issues- the linker/loader will bind all the sections very well even in a > single named memory region one section after another based on a default > algorithm. > > When you are trying to do run time relocation you need to make sure that the > sections *inside* the union do not get *loaded* into the same named memory > region. Remember the overlay is only at run-time and not at load time. At > load time you need to make sure one section doesnt overwrite another, Does > that make sense? > > Anyways, Iam kind of guessing that your probleme here is with your memory > directive. My guess is that in your case section2 is overwriting section1 > during load time. > > >.section1: load = SDRAM > >.section2: load = SDRAM > > This shd be probably changed to: > > >.section1: load = SDRAM1 > >.section2: load = SDRAM2 > > Assume, SDRAM1 starts at 8000 0000 and SDRAM2 starts at 8000 FFFF. > > Now Section2 doesnt overwrite Section1. > > let me know if it helps. > > --Bhooshan > > ----Original Message Follows---- > From: "bdnremi" <bdnremi@y...> > To: > Subject: [c6x] RUN_ADRESS and other linker command > Date: Wed, 29 Sep 2004 09:52:06 -0000 > > DSP Discussion Groups High Performance Digital Signal Processing - > C6000 > > RUN_ADRESS and other linker command > > myTI_0391262 - 03:08am Sep 29, 2004 CST > > hi, > > I would like to use the linker command command run adress. So I've > defined my text sections and my new .cmd file as below: > > SECTIONS > { > UNION: run = ISRAM, LOAD_START(_union_load_adresse), > LOAD_SIZE(_size_totale_union), RUN_SIZE(_size_max_union), RUN_START > (_adresse_run) > { > .section1: load = SDRAM > .section2: load = SDRAM > } > } > > When I look at my .map file generated at compilation, I can check > that .section1 and .section2 are not overlayed in SDRAM and have the > same run adress in the "Attibutes/input sections " column. > > My idea was to move one function dynamically during the program > execution by a memcpy: > > memcpy(adresse_run, <function>,(int)size_max_union); > > The issue is that both sections are placed together at the run > adress in ISRAM when I execute the program, and this before any > memcpy. > > So I can diffrentiate them. Can somebody help me ? > > thanks > > _____________________________________ > Note: If you do a simple "reply" with your email client, only the author of > this message will receive your answer. You need to do a "reply all" if you > want your answer to be distributed to the entire group. > > _____________________________________ > About this discussion group: > > To Join: Send an email to > > To Post: Send an email to > > To Leave: Send an email to > > Archives: http://www.yahoogroups.com/group/c6x > > Other Groups: http://www.dsprelated.com > > Yahoo! Groups Links > > > _________________________________________________________________ > Is your PC infected? Get a FREE online computer virus scan from McAfee > Security. http://clinic.mcafee.com/clinic/ibuy/campaign.asp? cid963 |
