Hi

[Tasos Bassoukos]

Alexios Chouchoulas wrote:
>   To Bus Error einai ena trap (argh, PDP-11 mode) san to Segmentation Fault.
> Alla enw to SIGSEGV erxetai gia na sou pei oti prospatheis na paikseis me
> mnhmh sthn opoia den exeis prosbash, to SIGBUS sou leei oti prospatheis na
> paikseis me diefthinseis opou den yparxei tipota: oyte mnhmh[0], oute I/O
> syskevh[1].

Se merika systhmata (merika RISC kai o palios kalos 68000) yparxei bus
error me thn morfh tou la8os alignment, px. an pas na diavaseis/grapseis
2/4-byte word se perrith (odd , (x&1)==1) diay8ynsh.
Se megalytera 680x0 to dior8osan ayto to feature :(

[snip] [gia ta i386]
> antistoixo exception me to SIGSEGV einai to GPF [2] kai einai exception 13
> [3]. SIGBUS den exoume stous i386). Oi platformes allazoun, alla orismena
> pragmata menoun.

Ti, den mporeis na prokalesei mia e3wterikh syskeyh/controller ena bus
error ? Hm... tou x86 tou leipoun perissotera pragmata ap' oti nomiza
... :-)

> --------------------
> [0] Core memory [4]. 4kwords ana quad h hex karta. Omorfa pragmatakia.
> [1] Ta PDP-11 kai oi apogonoi tous kanoun memory-mapped I/O.

Opws ola ta swsta systhmata :)

> [2] General Protection Fault

Alh8eia, pote den katalava akrivws ti shmainei to 'General'. Yparxei se
antidiastolh me kapoio 'Specific Protection Fault' ?

> [3] 13 ki atyxo.
> [4] Alithinh core memory. Siderenioi daktylioi me tria kalwdia na pernane
>     apo to kentro tous. Kathe daktylios = 1 bit. As mhn syzhthsoume gia
>     access times, ok?

Na mantepsw: tis metras kalytera me hliako roloi h me radioxronologhseis
?

> A.
> 

-- 
Bassoukos Tassos                                +30 31 996011

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