WebSVN – HelenOS-historic – Diff – /kernel/trunk/generic/src/mm/backend_elf.c



         * can be more instantions of the same memory ELF image
         * used at a time. Note that this could be later done
         * as COW.
         */
        if (entry->p_flags & PF_W) {
            frame = (__address)frame_alloc(ONE_FRAME, 0);
            memcpy((void *) PA2KA(frame), (void *) (base + i*FRAME_SIZE), FRAME_SIZE);
           
            if (area->sh_info) {
                frame_reference_add(ADDR2PFN(frame));
                btree_insert(&area->sh_info->pagemap, ALIGN_DOWN(addr, PAGE_SIZE) - area->base,

         * This is the uninitialized portion of the segment.
         * It is not physically present in the ELF image.
         * To resolve the situation, a frame must be allocated
         * and cleared.
         */
        frame = (__address)frame_alloc(ONE_FRAME, 0);
        memsetb(PA2KA(frame), FRAME_SIZE, 0);
 
        if (area->sh_info) {
            frame_reference_add(ADDR2PFN(frame));
            btree_insert(&area->sh_info->pagemap, ALIGN_DOWN(addr, PAGE_SIZE) - area->base,

         * The mixed case.
         * The lower part is backed by the ELF image and
         * the upper part is anonymous memory.
         */
        size = entry->p_filesz - (i<<PAGE_WIDTH);
        frame = (__address)frame_alloc(ONE_FRAME, 0);
        memsetb(PA2KA(frame) + size, FRAME_SIZE - size, 0);
        memcpy((void *) PA2KA(frame), (void *) (base + i*FRAME_SIZE), size);
 
        if (area->sh_info) {
            frame_reference_add(ADDR2PFN(frame));

    if (page + PAGE_SIZE < ALIGN_UP(entry->p_vaddr + entry->p_filesz, PAGE_SIZE)) {
        if (entry->p_flags & PF_W) {
            /*
             * Free the frame with the copy of writable segment data.
             */
            frame_free(frame);
        }
    } else {
        /*
         * The frame is either anonymous memory or the mixed case (i.e. lower
         * part is backed by the ELF image and the upper is anonymous).
         * In any case, a frame needs to be freed.
         */
        frame_free(frame);
    }
}
 
/** Share ELF image backed address space area.
 *

Rev 1757	Rev 1760
Line 132...	Line 132...
132	* can be more instantions of the same memory ELF image	132	* can be more instantions of the same memory ELF image
133	* used at a time. Note that this could be later done	133	* used at a time. Note that this could be later done
134	* as COW.	134	* as COW.
135	*/	135	*/
136	if (entry->p_flags & PF_W) {	136	if (entry->p_flags & PF_W) {
137	frame = PFN2ADDR(frame_alloc(ONE_FRAME, 0));	137	frame = (__address)frame_alloc(ONE_FRAME, 0);
138	memcpy((void ) PA2KA(frame), (void ) (base + i*FRAME_SIZE), FRAME_SIZE);	138	memcpy((void ) PA2KA(frame), (void ) (base + i*FRAME_SIZE), FRAME_SIZE);
139		139
140	if (area->sh_info) {	140	if (area->sh_info) {
141	frame_reference_add(ADDR2PFN(frame));	141	frame_reference_add(ADDR2PFN(frame));
142	btree_insert(&area->sh_info->pagemap, ALIGN_DOWN(addr, PAGE_SIZE) - area->base,	142	btree_insert(&area->sh_info->pagemap, ALIGN_DOWN(addr, PAGE_SIZE) - area->base,
Line 151...	Line 151...
151	* This is the uninitialized portion of the segment.	151	* This is the uninitialized portion of the segment.
152	* It is not physically present in the ELF image.	152	* It is not physically present in the ELF image.
153	* To resolve the situation, a frame must be allocated	153	* To resolve the situation, a frame must be allocated
154	* and cleared.	154	* and cleared.
155	*/	155	*/
156	frame = PFN2ADDR(frame_alloc(ONE_FRAME, 0));	156	frame = (__address)frame_alloc(ONE_FRAME, 0);
157	memsetb(PA2KA(frame), FRAME_SIZE, 0);	157	memsetb(PA2KA(frame), FRAME_SIZE, 0);
158		158
159	if (area->sh_info) {	159	if (area->sh_info) {
160	frame_reference_add(ADDR2PFN(frame));	160	frame_reference_add(ADDR2PFN(frame));
161	btree_insert(&area->sh_info->pagemap, ALIGN_DOWN(addr, PAGE_SIZE) - area->base,	161	btree_insert(&area->sh_info->pagemap, ALIGN_DOWN(addr, PAGE_SIZE) - area->base,
Line 168...	Line 168...
168	* The mixed case.	168	* The mixed case.
169	* The lower part is backed by the ELF image and	169	* The lower part is backed by the ELF image and
170	* the upper part is anonymous memory.	170	* the upper part is anonymous memory.
171	*/	171	*/
172	size = entry->p_filesz - (i<<PAGE_WIDTH);	172	size = entry->p_filesz - (i<<PAGE_WIDTH);
173	frame = PFN2ADDR(frame_alloc(ONE_FRAME, 0));	173	frame = (__address)frame_alloc(ONE_FRAME, 0);
174	memsetb(PA2KA(frame) + size, FRAME_SIZE - size, 0);	174	memsetb(PA2KA(frame) + size, FRAME_SIZE - size, 0);
175	memcpy((void ) PA2KA(frame), (void ) (base + i*FRAME_SIZE), size);	175	memcpy((void ) PA2KA(frame), (void ) (base + i*FRAME_SIZE), size);
176		176
177	if (area->sh_info) {	177	if (area->sh_info) {
178	frame_reference_add(ADDR2PFN(frame));	178	frame_reference_add(ADDR2PFN(frame));
Line 216...	Line 216...
216	if (page + PAGE_SIZE < ALIGN_UP(entry->p_vaddr + entry->p_filesz, PAGE_SIZE)) {	216	if (page + PAGE_SIZE < ALIGN_UP(entry->p_vaddr + entry->p_filesz, PAGE_SIZE)) {
217	if (entry->p_flags & PF_W) {	217	if (entry->p_flags & PF_W) {
218	/*	218	/*
219	* Free the frame with the copy of writable segment data.	219	* Free the frame with the copy of writable segment data.
220	*/	220	*/
221	frame_free(ADDR2PFN(frame));	221	frame_free(frame);
222	}	222	}
223	} else {	223	} else {
224	/*	224	/*
225	* The frame is either anonymous memory or the mixed case (i.e. lower	225	* The frame is either anonymous memory or the mixed case (i.e. lower
226	* part is backed by the ELF image and the upper is anonymous).	226	* part is backed by the ELF image and the upper is anonymous).
227	* In any case, a frame needs to be freed.	227	* In any case, a frame needs to be freed.
228	*/	228	*/
229	frame_free(ADDR2PFN(frame));	229	frame_free(frame);
230	}	230	}
231	}	231	}
232		232
233	/** Share ELF image backed address space area.	233	/** Share ELF image backed address space area.
234	*	234	*

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/mm/backend_elf.c – Rev 1757 → 1760