Changeset d1e8440 in mainline for kernel/generic/src/proc/program.c

Timestamp:

2012-11-11T16:27:06Z (12 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

6f5e213

Parents:

57355a40

Message:

Get rid of USTACK_ADDRESS.

• Let the kernel find a suitable address itself.
• Limit it to only one possibility using the bound argument of as_area_create().

File:

• kernel/generic/src/proc/program.c (modified) (1 diff)

kernel/generic/src/proc/program.c

@@ -79 +79 @@
          * Create the stack address space area.
          */
-        uintptr_t virt = USTACK_ADDRESS;
+        uintptr_t virt = (uintptr_t) -1;
+        uintptr_t bound = USER_ADDRESS_SPACE_END - (STACK_SIZE_USER - 1);
+
+        /* Adjust bound to create space for the desired guard page. */
+        bound -= PAGE_SIZE;
+
         as_area_t *area = as_area_create(as,
             AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE | AS_AREA_GUARD |
             AS_AREA_LATE_RESERVE, STACK_SIZE_USER, AS_AREA_ATTR_NONE,
-            &anon_backend, NULL, &virt, 0);
+            &anon_backend, NULL, &virt, bound);
         if (!area) {
                 task_destroy(prg->task);