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Description: Bulletin Board and Q&A for x86 assembly language topics. (Moderated)
 

unsigned/signed in asm 
  Hi How can i make sure, that an 32-Bit-Value (on a 32-Bit-System) is unsigned (positive). As exapmple : 0FFFFFFFFh : How can i make sure, that this is not -1 ? If i call a function, that allows positive and negative arguments, what have i to do ? Here an example: var dword 0 ...... more »
By dl  - Jun 4 - 4 new of 4 messages    

How compilers implement objects in x86 assembly 
  Hi, I'm learning x86 assembly on my free time and I'm trying to find how does high level compilers implement classes and objects in x86 asm. So far I saw some toy compilers that use structs, but the way I understand it, structs are abstraction feature provided by assemblers like MASM e FASM. How would they implement classes and objects without structs? Arrays and offsets?... more »
By danielzaz...@nospicedham.gmail.com  - May 30 - 10 new of 10 messages    

Challenge: More Instructions in Fewer Bytes 
  Hi all, I'm sorry if this is a bit naive. Long ago, in an IRC channel far far away, the following idea for a challenge appeared: Write two versions of the same routine/algorithm where the one using more instructions is fewer bytes in the resulting binary. This may be trivial, particularly since I'm not giving any restrictions... more »
By Johann 'Myrkraverk' Oskarsson  - May 29 - 6 new of 6 messages    

How does this instruction assemble ? 
  Hallo, I have to use an assembler that can only assemble <= 386 instructions (don't ask ...). I want to use instruction: movnti es:[bx],eax from a 16-bit (!) code segment. Does this assemble as: ; movnti es:[bx],eax db 026h,00fh,0c3h,007h 026h : es segment override prefix... more »
By Lars Erdmann  - May 26 - 5 new of 5 messages    

Forcing reading and writing uncached 
  Hallo, I need to read/write memory mapped registers. Suppose the BIOS / OS has not properly marked that memory mapped range as unc-cachable (UC). Is there any instruction in the Intel instruction set so that on read I can bypass the cache and likewise on writing so as to ensure I don't read some... more »
By Lars Erdmann  - May 25 - 13 new of 13 messages    

Trying to find old versions of Tran's PMODE 
  Trying to find old versions of Tran's PMODE, preferably something in the late v2's Anyone have an old copy or know where it's still available? -- Brent C (any direct replies should be sent to x87asm, remove spam tastes awful and the periods)
By Brent C  - May 23 - 5 new of 5 messages    

masm include-problem 
  Hi. I installed the masm32v11r And then i geht this errors, when i start assembling: \masm32\include\windows.inc(15 6) : error A2004: symbol type conflict : bool \masm32\include\windows.inc(78 35) : error A2179: structure improperly initialized This are the parts of windows.inc: Here at line 156: (symbol type conflict : bool)... more »
By dl  - May 15 - 3 new of 3 messages    

My Sincerest Apologies 
  This is a message for Frank B. Kotler Frank, I just want to say how sorry I am that a minor metaphor matastasized into a mountain of misery. At least, it did for me and those around me. It is often the case that we stumble in our ignorance, but I just want you to know no harm was intended. I was just being a jerk in response... more »
By Spam Free  - May 13 - 7 new of 7 messages    

"Wrap around" in protected mode ? 
  Sorry if this is the wrong newsgroup: I have a question about protected mode under x86: Consider this instruction: mov eax, ds:[bx] (mov eax, [bx]) talking about "normal" (not expand down) segments and for sake of simplicity a segment with 1-byte limit granularity: the limit of a segment is compared against the OFFSET specified in say a... more »
By Lars Erdmann  - May 13 - 7 new of 7 messages    

Knuth's "Man or Boy" 
  The following is a PL/I version of Donald Knuth's "Man or Boy" compiler test program: morb: proc options (main) reorder; dcl sysprint file; dcl i fixed bin (31); do i = 0 to 30; put skip edit('i = ', i, a((i), x1, x2, x3, x4, x5)) (a(4), p'z9b', P'---,---,--9');... more »
By Robert AH Prins  - May 10 - 25 new of 25 messages    

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