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November 22nd, 2003
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#1 (permalink) |
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Ar-digital Intelligence
 Join Date: Nov 2003
Location: PC heaven
Posts: 53
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HELP... CPU instructions, Little-Endian or Big-Endian?
please help,
i'm writing a PS2 emu and i just came to the part of interpreting CPU instructions, i want to extract, for instance, the opcode num from the instruction set, BUT: should i treat the instruction as Little-Endian byte order, or Big-Endian? i mean, for instance, is the opcode in the FIRST byte in the ELF file, or in the FOURTH one??? PLEASE help me out! thanx.
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 My system: [Motherboard:] Gigabyte 8IPE1000Pro-G (Intel 865PE chipset) [Processor:] Intel Pentium 4 2.80E (FSB800, 1MB cache, HyperThreading support) [RAM:] 512MB DDR400 [Video card:] nVidia GeForce FX 5900 Ultra 256MB DDR (ASUS V9950 Ultra) [Hard drive:] 80GB Seagate Barracuda 7200.7 |
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November 23rd, 2003
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#2 (permalink) |
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Administrator
 Join Date: Dec 2001
Location: Montreal, Canada
Posts: 7,067
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Re: HELP... CPU instructions, Little-Endian or Big-Endian?
psycho_cyclone this is just a little advice. you would probably have better luck asking these kind of questions directly to an emu author. most authors dont visit the board (there are some exceptions of course) and you would probably get a faster answer by contacting via email an author
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November 23rd, 2003
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#3 (permalink) |
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"Insert witty title here"
Join Date: Jun 2003
Location: In a house
Posts: 1,046
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Re: HELP... CPU instructions, Little-Endian or Big-Endian?
I saw on a site somewhere that the PS2 has the same endianness(is that a word?) as the PC. If that's true, it would of course be little endian.
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November 23rd, 2003
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#4 (permalink) |
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Emu author
 Join Date: Aug 2003
Location: Victorville(Near Los Angeles or LA for those who are on the DL)
Posts: 839
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Re: HELP... CPU instructions, Little-Endian or Big-Endian?
These questions really should be simple to find out, just look around for documentation. Also I'm fairly certain that it is little-endian byte order, meaning no byte-order conversion need be done.
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----------------- Emu Tinkerer and C++ Programmer |
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November 24th, 2003
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#5 (permalink) |
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"Insert witty title here"
Join Date: Jun 2003
Location: In a house
Posts: 1,046
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Re: HELP... CPU instructions, Little-Endian or Big-Endian?
Hmm, zenogais, excuse me if I sound stupid, but I thought little-endian was having the higher bytes after the low bytes. Wouldn't it be big-endian that needs no conversion? Again, excuse me if I sound stupid, I'm no expert.
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November 24th, 2003
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#6 (permalink) | |
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B( o Y o )BS?
Join Date: Feb 2002
Location: Spain
Posts: 847
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Re: HELP... CPU instructions, Little-Endian or Big-Endian?
Quote:
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