Changeset 1f12fab in mainline for kernel/arch/sparc32/src/proc/thread.c

Timestamp:

2013-10-07T20:00:34Z (11 years ago)

Author:

Jakub Klama <jakub.klama@…>

Branches:

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

Children:

a73ebf0

Parents:

80d9d83

Message:

First attempt to implement preemptive trap handlers
and switch to userspace. Preemptive traps are needed
for at least page faults, as page fault handling code
can trigger window underflow/overflow exceptions.

This commit also introduces userspace window buffer
for saving userspace register windows (just as in
sparc64).

These changes are unfinished and far from working
correctly.

File:

• kernel/arch/sparc32/src/proc/thread.c (modified) (1 diff)

kernel/arch/sparc32/src/proc/thread.c

@@ -33 +33 @@
  */
 
+#include <arch/regwin.h>
 #include <proc/thread.h>
+
+void thr_constructor_arch(thread_t *t)
+{
+        t->arch.uspace_window_buffer = NULL;
+}
+
+void thr_destructor_arch(thread_t *t)
+{
+        if (t->arch.uspace_window_buffer) {
+                uintptr_t uw_buf = (uintptr_t) t->arch.uspace_window_buffer;
+                /*
+                 * Mind the possible alignment of the userspace window buffer
+                 * belonging to a killed thread.
+                 */
+                free((uint8_t *) ALIGN_DOWN(uw_buf, UWB_ALIGNMENT));
+        }
+}
 
 void thread_create_arch(thread_t *t)
 {
+        if ((t->uspace) && (!t->arch.uspace_window_buffer))
+                {
+                /*
+                 * The thread needs userspace window buffer and the object
+                 * returned from the slab allocator doesn't have any.
+                 */
+                t->arch.uspace_window_buffer = malloc(UWB_ASIZE, 0);
+        } else {
+                uintptr_t uw_buf = (uintptr_t) t->arch.uspace_window_buffer;
+
+                /*
+                 * Mind the possible alignment of the userspace window buffer
+                 * belonging to a killed thread.
+                 */
+                t->arch.uspace_window_buffer = (uint8_t *) ALIGN_DOWN(uw_buf,
+                    UWB_ASIZE);
+        }
 }