Changeset 80487bc5 in mainline for kernel/generic/src/udebug/udebug_ops.c

Timestamp:

2010-01-25T21:40:13Z (14 years ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

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

Children:

e515b21a

Parents:

0d21b53

Message:

Allow taskdump to read register state and extract PC, FP (not implemented for all arches).

File:

• kernel/generic/src/udebug/udebug_ops.c (modified) (2 diffs)

kernel/generic/src/udebug/udebug_ops.c

@@ -449 +449 @@
  * 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)
@@ -481 +484 @@
 }
 
+/** 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.
  *