openrisc: Add thread-local storage (TLS) support

Historically OpenRISC GCC has reserved r10 which we now use to hold
the thread pointer for thread-local storage (TLS).

Signed-off-by: Christian Svensson <blue@cmd.nu>
Signed-off-by: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Stafford Horne <shorne@gmail.com>

diff --git a/arch/openrisc/kernel/process.c b/arch/openrisc/kernel/process.c
index 7095dfe..277123b 100644 (file)
--- a/arch/openrisc/kernel/process.c
+++ b/arch/openrisc/kernel/process.c
@@ -173,6 +173,19 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
 
                if (usp)
                        userregs->sp = usp;
+
+               /*
+                * For CLONE_SETTLS set "tp" (r10) to the TLS pointer passed to sys_clone.
+                *
+                * The kernel entry is:
+                *      int clone (long flags, void *child_stack, int *parent_tid,
+                *              int *child_tid, struct void *tls)
+                *
+                * This makes the source r7 in the kernel registers.
+                */
+               if (clone_flags & CLONE_SETTLS)
+                       userregs->gpr[10] = userregs->gpr[7];
+
                userregs->gpr[11] = 0;  /* Result from fork() */
 
                kregs->gpr[20] = 0;     /* Userspace thread */