Changes in kernel/generic/src/udebug/udebug_ops.c [41df2827:3698e44] in mainline

File:

• kernel/generic/src/udebug/udebug_ops.c (modified) (10 diffs)

kernel/generic/src/udebug/udebug_ops.c

@@ -46 +46 @@
 #include <errno.h>
 #include <print.h>
+#include <string.h>
 #include <syscall/copy.h>
 #include <ipc/ipc.h>
@@ -209 +210 @@
 
                 mutex_lock(&t->udebug.lock);
-                if ((t->flags & THREAD_FLAG_USPACE) != 0)
+                if ((t->flags & THREAD_FLAG_USPACE) != 0) {
                         t->udebug.active = true;
-                mutex_unlock(&t->udebug.lock);
+                        mutex_unlock(&t->udebug.lock);
+                        condvar_broadcast(&t->udebug.active_cv);
+                } else {
+                        mutex_unlock(&t->udebug.lock);
+                }
         }
 
@@ -355 +360 @@
  *
  * If the sequence is longer than @a buf_size bytes, only as much hashes
- * as can fit are copied. The number of thread hashes copied is stored
- * in @a n.
+ * as can fit are copied. The number of bytes copied is stored in @a stored.
+ * The total number of thread bytes that could have been saved had there been
+ * enough space is stored in @a needed.
  *
  * The rationale for having @a buf_size is that this function is only
@@ -364 +370 @@
  * @param buffer        The buffer for storing thread hashes.
  * @param buf_size      Buffer size in bytes.
- * @param n             The actual number of hashes copied will be stored here.
- */
-int udebug_thread_read(void **buffer, size_t buf_size, size_t *n)
+ * @param stored        The actual number of bytes copied will be stored here.
+ * @param needed        Total number of hashes that could have been saved.
+ */
+int udebug_thread_read(void **buffer, size_t buf_size, size_t *stored,
+    size_t *needed)
 {
         thread_t *t;
         link_t *cur;
         unative_t tid;
-        unsigned copied_ids;
+        size_t copied_ids;
+        size_t extra_ids;
         ipl_t ipl;
         unative_t *id_buffer;
@@ -380 +389 @@
 
         /* Allocate a buffer to hold thread IDs */
-        id_buffer = malloc(buf_size, 0);
+        id_buffer = malloc(buf_size + 1, 0);
 
         mutex_lock(&TASK->udebug.lock);
@@ -396 +405 @@
         max_ids = buf_size / sizeof(unative_t);
         copied_ids = 0;
+        extra_ids = 0;
 
         /* FIXME: make sure the thread isn't past debug shutdown... */
         for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) {
-                /* Do not write past end of buffer */
-                if (copied_ids >= max_ids) break;
-
                 t = list_get_instance(cur, thread_t, th_link);
 
@@ -409 +416 @@
 
                 /* Not interested in kernel threads. */
-                if ((flags & THREAD_FLAG_USPACE) != 0) {
+                if ((flags & THREAD_FLAG_USPACE) == 0)
+                        continue;
+
+                if (copied_ids < max_ids) {
                         /* Using thread struct pointer as identification hash */
                         tid = (unative_t) t;
                         id_buffer[copied_ids++] = tid;
+                } else {
+                        extra_ids++;
                 }
         }
@@ -422 +434 @@
 
         *buffer = id_buffer;
-        *n = copied_ids * sizeof(unative_t);
+        *stored = copied_ids * sizeof(unative_t);
+        *needed = (copied_ids + extra_ids) * sizeof(unative_t);
+
+        return 0;
+}
+
+/** Read task name.
+ *
+ * Returns task name as non-terminated string in a newly allocated buffer.
+ * Also returns the size of the data.
+ *
+ * @param data          Place to store pointer to newly allocated block.
+ * @param data_size     Place to store size of the data.
+ *
+ * @returns             EOK.
+ */
+int udebug_name_read(char **data, size_t *data_size)
+{
+        size_t name_size;
+
+        name_size = str_size(TASK->name) + 1;
+        *data = malloc(name_size, 0);
+        *data_size = name_size;
+
+        memcpy(*data, TASK->name, name_size);
 
         return 0;
@@ -437 +473 @@
  * this function will fail with an EINVAL error code.
  *
- * @param buffer        The buffer for storing thread hashes.
+ * @param t             Thread where call arguments are to be read.
+ * @param buffer        Place to store pointer to new buffer.
+ * @return              EOK on success, ENOENT if @a t is invalid, EINVAL
+ *                      if thread state is not valid for this operation.
  */
 int udebug_args_read(thread_t *t, void **buffer)
@@ -469 +508 @@
 }
 
+/** Read the register state of the thread.
+ *
+ * The contents of the thread's istate structure are copied to a newly
+ * allocated buffer and a pointer to it is written to @a buffer. The size of
+ * the buffer will be sizeof(istate_t).
+ *
+ * Currently register state cannot be read if the thread is inside a system
+ * call (as opposed to an exception). This is an implementation limit.
+ *
+ * @param t             Thread whose state is to be read.
+ * @param buffer        Place to store pointer to new buffer.
+ * @return              EOK on success, ENOENT if @a t is invalid, EINVAL
+ *                      if thread is not in valid state, EBUSY if istate
+ *                      is not available.
+ */
+int udebug_regs_read(thread_t *t, void **buffer)
+{
+        istate_t *state, *state_buf;
+        int rc;
+
+        /* Prepare a buffer to hold the data. */
+        state_buf = malloc(sizeof(istate_t), 0);
+
+        /* On success, this will lock t->udebug.lock */
+        rc = _thread_op_begin(t, false);
+        if (rc != EOK) {
+                return rc;
+        }
+
+        state = t->udebug.uspace_state;
+        if (state == NULL) {
+                _thread_op_end(t);
+                return EBUSY;
+        }
+
+        /* Copy to the allocated buffer */
+        memcpy(state_buf, state, sizeof(istate_t));
+
+        _thread_op_end(t);
+
+        *buffer = (void *) state_buf;
+        return 0;
+}
+
 /** Read the memory of the debugged task.
  *