Hi Mychaela and community, On 30.11.2023 04:58, Mychaela Falconia wrote:
However, I now have to revise that hypothesis - my current working hypothesis is that the swear block is, after all, fully defunct code, totally dead. My rationale: the portion of the firmware we are looking at here is clearly the .const section, equivalent of .rodata in more standard toolchains. In order for a datum in the .const section to be active in any way, used for anything, its absolute address has to appear as an aligned 32-bit word somewhere in the fw image, be it in a literal pool in a code section or a part of some other const or initialized data item. However, searching the hex dump for "F4 72 33 00" (that's how 32-bit word 0x3372F4 will appear in LE byte order in a hex dump) yields no hits - hence the datum appears to be dead indeed, included in an object that went into the link, but not referenced from anywhere.
sigh. I hoped until the last moment that your guess would be true :P
Given that the swear block appears directly after some tables dealing with text entry via the numeric keypad, I wonder if the perhaps the table of swearwords was once written as some kind of prototype test code for a dictionary-based "predictive" text entry method - then later a "real" (more official) dictionary was implemented, but the naughty test table was never removed from the code, turning into a foul-taste Easter egg for reverse engineers looking at hex dump images decades later...
Could have pretty much been the case, yes.
Anyways, this is all from me for now - I assume Vadim will probably post more info about this newly discovered phone later.
Today I took the phone apart and made a few photos of the PCB. Here is the best one of them, uploaded to Osmocom's Redmine:
https://osmocom.org/attachments/7155 https://osmocom.org/attachments/download/7155/SE-J120i-PCB.jpg * DBB: D751749ZPH * RF PA: SKY77318-12 (similarly to SE K200) * RF TRX: Si4210 (like in Motorola C168?) * TI T3025BZQW (?) * MX92U832ZCG (audio?) * J030W[0D]YT02 (?) -- Best regards, Vadim. _______________________________________________ Community mailing list Community@freecalypso.org https://www.freecalypso.org/mailman/listinfo/community
