Linked by Thom Holwerda on Mon 4th Dec 2006 19:47 UTC, submitted by RISCOSMike
RISC OS A cheeky programmer has produced an unofficial patch to allow the previously Iyonix-only Firefox 2 port to run on A9home computers. The hack intercepts low level ARMv5 instructions that the Iyonix's IOP321 XScale can execute, and converts them into instructions suitable for the ARMv4 Samsung ARM920T processor in the A9home. On a related note, RPCEmu has been updated to work with RISC OS 6.
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More Like an Emulator...
by NeoSmart on Mon 4th Dec 2006 23:18 UTC
NeoSmart
Member since:
2006-06-26

Anything that intercepts low-level calls to the OS/Platform and then converts them is technically a "emulator" and not a "port" per-say.

That said, this more in line with Wine's "emulator" (if you could call it that) more than a virtualization layer.

Explanation:
Virtualization layer would involve an entire platform "faked" to pretend to be lyonix. This instead just has its own API that can intercept and convert the ARMv5 instructions to the ARMv4 - to be exact this is what Rosetta on Mac OS X does (except bridging two different platforms).

Now if it were a 'port' it would involve re-writing the Firefox 2's high-level source code - something totally different.

Either way, the result is the same, it now works at near-full speed on ARMv4. Thank you ;)

Reply Score: 2

RE: More Like an Emulator...
by helf on Mon 4th Dec 2006 23:59 UTC in reply to "More Like an Emulator..."
helf Member since:
2005-07-06

I thought Rosetta was a JIT Translator. As in, it translated PPC instructions to x86 on the fly. Isn't that what this is doing? Thats not emulation... But I'm not expert on this ;)

Edited 2006-12-05 00:01

Reply Score: 2

You shoulsn't have to hack
by madcrow on Tue 5th Dec 2006 15:11 UTC
madcrow
Member since:
2006-03-13

Meh. I don't see why the person doing the port was able to keep their port closed-sourced. I though under the MPL, only Netscape had the right to create closed-source forks of the Mozilla code. If I were the Mozilla Corporation, I would be coming down on the originator of the RISC OS port like a ton of bricks.

Reply Score: 1