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exec-loader's Introduction

Loader de Executabile

Handler-ul implementat incepe prin a verifica din ce segment al executabilului face parte adresa la care s-a produs page fault-ul. Indexul acestuia este returnat de functia find_seg. In cazul in care adresa nu se gaseste in niciun segment, înseamnă că este un acces invalid la memorie si se rulează handler-ul default de page fault.

In continuare, se afla indexul paginii care incadreaza adresa page fault-ului prin apelul functiei find_page. In cazul in care pagina este deja mapata (lucru verificat prin vectorul de frecventa asociat), se încearcă un acces la memorie nepermis (segmentul respectiv nu are permisiunile necesare) si se rulează handler-ul default de page fault. Altfel, pagina se mapeaza si se marcheaza acest lucru in vectorul de frecventa salvat in data.

Se repozitioneaza offset-ul fisierului la inceputul paginii gasite si se citeste din fisier.

La final, se seteaza permisiunile segmentului curent.

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