Changeset 408 for trunk/hal/generic/hal_context.h

Timestamp:

Dec 5, 2017, 4:20:07 PM (6 years ago)

Author:

alain

Message:

Fix several bugs in the fork() syscall.

File:

• trunk/hal/generic/hal_context.h (modified) (2 diffs)

trunk/hal/generic/hal_context.h

@@ -57 +57 @@
 
 /****************************************************************************************
- * This function display the following slots of a thread CPU context:
- * - GPR : gp_28 , sp_29 , ra_31
- * - CP0 : c0_sr , c0_th , c0_epc
- * - CP2 : c2_ptpr , c2-mode
+ * This function is used to implement the fork() system call. 
+ * 1) It saves in a remote (child) thread CPU context the current CPU registers values.
+ *    Three slots are not simple copies of the parent registers values :
+ *    - the thread pointer is set to the child thread local pointer. 
+ *    - the stack pointer is set to parrent SP + (child_base - parent_base).
+ *    - the status register is set to kernel mode with IRQ disabled.
+ * 2) It copies the content of the calling (parent) thread kernel_stack,
+ *    to the remote (child) thread kernel_stack.
  ****************************************************************************************
- * @ thread  : local pointer on the thread descriptor.
+ * @ thread_xp  : extended pointer on the remote thread descriptor.
  ***************************************************************************************/
-void hal_cpu_context_display( struct thread_s * thread );
+void hal_cpu_context_fork( xptr_t    thread_xp );
+
+/****************************************************************************************
+ * This function display some slots of the CPU context.
+ * - For the MIPS32 :
+ *   . GPR : gp_28 , sp_29 , ra_31
+ *   . CP0 : c0_sr , c0_th , c0_epc
+ *   . CP2 : c2_ptpr , c2-mode
+ * - For X86 TODO :
+ ****************************************************************************************
+ * @ thread_xp  : extended pointer on the thread descriptor.
+ ***************************************************************************************/
+void hal_cpu_context_display( xptr_t  thread_xp );
 
 /****************************************************************************************
@@ -106 +122 @@
 
 /****************************************************************************************
- * This function saves in the thread uzone the FPU registers values.
+ * This function is used to implement the fork() system call. 
+ * It saves in a remote thread FPU context the current FPU registers values.
  ****************************************************************************************
- * @ thread  : pointer on the thread descriptor.
+ * @ thread_xp  : extended pointer on the remote thread descriptor.
  ***************************************************************************************/
-void hal_fpu_context_save( struct thread_s * thread );
+void hal_fpu_context_save( xptr_t thread_xp );
 
 /****************************************************************************************
- * This function restores from the thread uzone the FPU registers values.
+ * This function restores from the calling thread FPU context the FPU registers values.
  ****************************************************************************************
  * @ thread  : pointer on the thread descriptor.