Timeline for First steps with amd64 assembly
Current License: CC BY-SA 3.0
15 events
| when toggle format | what | by | license | comment | |
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| Mar 6, 2014 at 21:10 | vote | accept | FUZxxl | ||
| Mar 6, 2014 at 16:25 | answer | added | ChrisW | timeline score: 3 | |
| Mar 6, 2014 at 15:43 | history | edited | konijn |
edited tags
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| Oct 27, 2012 at 19:13 | comment | added | Hawken | In 64bit it would seem that it's required, so you were right, I should have known. I'm currently writing 16bit x86 assembly without an OS where segmentation is needed to address your full 20bit address space. Thanks for correcting me. | |
| Oct 27, 2012 at 11:32 | history | edited | FUZxxl | CC BY-SA 3.0 |
Change segment to section as to avoid confusion
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| Oct 27, 2012 at 10:12 | comment | added | FUZxxl | Okay. My bad. This code really is x86 code, but nevertless it is written for linux. Linux, in a similar way as most x86 operating systems today, does not use segmentation (except for some special threading related concepts). All segment registers are set to zero; all accesses to memory are done in the same address space. | |
| Oct 26, 2012 at 21:43 | comment | added | Hawken | Hmm, I did not know that. wiki.osdev.org/X86-64 contains information on this for anyone else who did not know. | |
| Oct 26, 2012 at 20:48 | comment | added | FUZxxl | @Hawken You see that this code is written for x86-64 linux which uses a flat memory modell? All segment registers except %fs and %gs which serve a special purpose are set to zero. | |
| Oct 26, 2012 at 20:43 | comment | added | Hawken |
all memory is referenced using the segment specified by %ds or if it's on the stack, %ss. Unless you have personally set the segment register, mov %cs,%ds, or your assembler is adding a custom segment offset, you can't read from outside .data. I don't know if modern OSs allow you to read from .text at all even if you did.
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| Oct 23, 2012 at 5:02 | comment | added | FUZxxl | @Hawken How do you come to this conclusion? | |
| Oct 22, 2012 at 23:42 | comment | added | Hawken | I don't think you can access data unless it's in the data segment. | |
| Apr 24, 2012 at 20:10 | history | tweeted | twitter.com/#!/StackCodeReview/status/194881092870877184 | ||
| Apr 23, 2012 at 20:58 | history | edited | FUZxxl | CC BY-SA 3.0 |
edited body
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| Apr 23, 2012 at 13:35 | history | edited | FUZxxl | CC BY-SA 3.0 |
deleted 1 characters in body
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| Apr 23, 2012 at 10:46 | history | asked | FUZxxl | CC BY-SA 3.0 |