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The Old New Thing
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    The Old New Thing

    July 2015 | The Old New Thing

    The Itanium processor, part 5: The GP register, calling functions, and function pointers
    The Itanium processor, part 5: The GP register, calling functions, and function pointers
    Raymond ChenRaymond ChenJuly 31, 2015Jul 31, 201507/31/15
    We saw a brief mention of the gp register last time, where we saw it used when we calculated the address of a global variable. The only addressing mode supported by the Itanium processor is register indirect (possibly with post-increment). There is no absolute addressing mode. If you want to access a global variable, you need to calculate its...

    Comments are closed.0Other
    The Itanium processor, part 3b: How does spilling actually work?
    The Itanium processor, part 3b: How does spilling actually work?
    Raymond ChenRaymond ChenJuly 30, 2015Jul 30, 201507/30/15
    Answering some interesting questions that arose yesterday. I didn't know the answers either, so I went and read the manual, specifically Volume 2 (IA-64 System Architecture), chapter 6 (IA-64 Register Stack Engine). Evan asks, Is the spilling to the stack done by the hardware, or does it trap into the OS?" According to the manual: The RSE ...

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    The Itanium processor, part 4: The Windows calling convention, leaf functions
    The Itanium processor, part 4: The Windows calling convention, leaf functions
    Raymond ChenRaymond ChenJuly 30, 2015Jul 30, 201507/30/15
    Last time, we looked at the general rules for parameter passing on the Itanium. But those rules are relaxed for leaf functions (functions which call no other functions). Before we start, I need to correct some of the explanation I had given when introducing the calling convention. I used that explanation because it makes for an easier ...

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    The Itanium processor, part 3: The Windows calling convention, how parameters are passed
    The Itanium processor, part 3: The Windows calling convention, how parameters are passed
    Raymond ChenRaymond ChenJuly 29, 2015Jul 29, 201507/29/15
    The calling convention on Itanium uses a variable-sized register window. The mechanism by which this is done is rather complicated, so I'm first going to present a conceptual version, and then I'll come back and fix up some of the implementation details. For today, I'm just going to talk about how parameters are passed. There are other aspects...

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    The Itanium processor, part 2: Instruction encoding, templates, and stops
    The Itanium processor, part 2: Instruction encoding, templates, and stops
    Raymond ChenRaymond ChenJuly 28, 2015Jul 28, 201507/28/15
    Instructions on Itanium are grouped into chunks of three, known as bundles, and each of the three positions in a bundle is known as a slot. A bundle is 128 bits long (16 bytes) and always resides on a 16-byte boundary, so that the last digit of the address is always zero. The Windows debugging engine disassembler shows the three slots as if ...

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    The Itanium processor, part 1: Warming up
    The Itanium processor, part 1: Warming up
    Raymond ChenRaymond ChenJuly 27, 2015Jul 27, 201507/27/15
    The Itanium may not have been much of a commercial success, but it is interesting as a processor architecture because it is different from anything else commonly seen today. It's like learning a foreign language: It gives you an insight into how others view the world. The next two weeks will be devoted to an introduction to the Itanium ...

    Comments are closed.0Other
    The curse of the redefinition of the symbol HLOG
    The curse of the redefinition of the symbol HLOG
    Raymond ChenRaymond ChenJuly 24, 2015Jul 24, 201507/24/15
    A customer was running into a compiler error complaining about redefinition of the symbol HLOG. The result is "Our project uses both performance counters (pdh.h) and networking (lm.h). What can we do to avoid this conflict?" We've seen this before. The conflict arises from two problems. First is hubris/lack of creativity. "My component ...

    Comments are closed.0Code
    Corrupted file causes application to crash; is that a security vulnerability?
    Corrupted file causes application to crash; is that a security vulnerability?
    Raymond ChenRaymond ChenJuly 23, 2015Jul 23, 201507/23/15
    A security vulnerability report came in that went something like this: We have found a vulnerability in the XYZ application when it opens the attached corrupted file. The error message says, "Unhandled exception: System.OverflowException. Value was either too large or too small for an Int16." For a nominal subscription fee, you can learn ...

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    When you think you found a problem with a function, make sure you’re actually calling the function, episode 2
    When you think you found a problem with a function, make sure you’re actually calling the function, episode 2
    Raymond ChenRaymond ChenJuly 22, 2015Jul 22, 201507/22/15
    A customer reported that the Duplicate­Handle function was failing with ERROR_INVALID_HANDLE even though the handle being passed to it seemed legitimate: The handle in m_Event appears to be valid. It is non-null, and we can still set and reset it. But we can't duplicate it. Now, before claiming that a function doesn't work, you should ...

    Comments are closed.0Code
    Please enjoy the new eco-friendly printers, now arguably less eco-friendly
    Please enjoy the new eco-friendly printers, now arguably less eco-friendly
    Raymond ChenRaymond ChenJuly 21, 2015Jul 21, 201507/21/15
    Some years ago, the IT department replaced the printers multifunction devices with new reportedly eco-friendly models. One feature of the new devices is that when you send a job to the printer, it doesn't print out immediately. Printing doesn't begin until you go to the device and swipe your badge through the card reader. The theory here is ...

    Comments are closed.0Non-Computer
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