Commit 27abb210 authored by Andrey Filippov's avatar Andrey Filippov
Browse files

trying to analyze struct vm_area_struct

parent 1c5e28a8

src/lib/iov_iter.c

+14 −3
Original line number Original line Diff line number Diff line
@@ -1238,12 +1238,15 @@ ssize_t iov_iter_get_pages_elphel(struct iov_iter *i, 
	const struct page * circbuf0_page0 = phys_to_page(circbuf_pa[0]);

	const struct page * circbuf0_page0 = phys_to_page(circbuf_pa[0]);

	size_t len;

	size_t len;

	const struct iovec *iov = i->iov; // only use first in array - supposed to be a single-element

	const struct iovec *iov = i->iov; // only use first in array - supposed to be a single-element

	unsigned long addr = (unsigned long) iov->iov_base;

	unsigned long addr;

	unsigned long faddr = (unsigned long) iov->iov_base;

	struct vm_area_struct *vm_area;





// *** Putting temporary address here

// *** Putting temporary address here

	struct page * cur_page = (struct page * ) circbuf0_page0;

	struct page * cur_page = (struct page * ) circbuf0_page0;

	pr_debug("circbuf0_page0 = 0x%08x, circbuf0_page0->compound_head=0x%08lx, faddr=0x%08lx, mapcount=%u", \

			(int) circbuf0_page0, circbuf0_page0->compound_head, faddr ,page_mapcount((struct page *) circbuf0_page0));

	addr = 0;

	addr = 0;

	pr_debug("circbuf0_page0 = 0x%08x, circbuf0_page0->compound_head=0x%08lx", (int) circbuf0_page0, circbuf0_page0->compound_head );

	len = iov->iov_len + (*start = addr & (PAGE_SIZE - 1)); // to inlude beginning of the page - for now 0;

	len = iov->iov_len + (*start = addr & (PAGE_SIZE - 1)); // to inlude beginning of the page - for now 0;

	if (maxsize > i->count)

	if (maxsize > i->count)

		maxsize = i->count;

		maxsize = i->count;
@@ -1259,7 +1262,15 @@ ssize_t iov_iter_get_pages_elphel(struct iov_iter *i, 
		pages[indx] = cur_page++;

		pages[indx] = cur_page++;

	}

	}

	len -= *start;

	len -= *start;

	pr_debug("iov_iter_get_pages_elphel()->0x%08x, n=%u, current->mm->map_count=%u", len, n, current->mm->map_count);

	pr_debug("iov_iter_get_pages_elphel()->0x%08x, n=%u, current->mm->map_count=%u",\

			len, n, current->mm->map_count);

	pr_debug("sizeof(struct vm_area_struct)=%d", sizeof(struct vm_area_struct));

	for (vm_area = current->mm->mmap; vm_area;  vm_area = vm_area-> vm_next) {

		if ((faddr >= vm_area->vm_start) && (faddr < vm_area->vm_end)) {

			print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, vm_area, sizeof(struct vm_area_struct));

		}



	}

	return len;

	return len;

}

}

EXPORT_SYMBOL(iov_iter_get_pages_elphel);

EXPORT_SYMBOL(iov_iter_get_pages_elphel);