parisc: Implement copy_thread_tls

This is required for clone3 which passes the TLS value through a
struct rather than a register.

Signed-off-by: Amanieu d'Antras <amanieu@gmail.com>
Cc: linux-parisc@vger.kernel.org
Cc: <stable@vger.kernel.org> # 5.3.x
Link: https://lore.kernel.org/r/20200102172413.654385-5-amanieu@gmail.com
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index b16237c..0c29d6c 100644 (file)
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -62,6 +62,7 @@ config PARISC
        select HAVE_FTRACE_MCOUNT_RECORD if HAVE_DYNAMIC_FTRACE
        select HAVE_KPROBES_ON_FTRACE
        select HAVE_DYNAMIC_FTRACE_WITH_REGS
+       select HAVE_COPY_THREAD_TLS
 
        help
          The PA-RISC microprocessor is designed by Hewlett-Packard and used

diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
index ecc5c27..230a642 100644 (file)
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -208,8 +208,8 @@ arch_initcall(parisc_idle_init);
  * Copy architecture-specific thread state
  */
 int
-copy_thread(unsigned long clone_flags, unsigned long usp,
-           unsigned long kthread_arg, struct task_struct *p)
+copy_thread_tls(unsigned long clone_flags, unsigned long usp,
+           unsigned long kthread_arg, struct task_struct *p, unsigned long tls)
 {
        struct pt_regs *cregs = &(p->thread.regs);
        void *stack = task_stack_page(p);
@@ -254,9 +254,9 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
                cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE;
                cregs->kpc = (unsigned long) &child_return;
 
-               /* Setup thread TLS area from the 4th parameter in clone */
+               /* Setup thread TLS area */
                if (clone_flags & CLONE_SETTLS)
-                       cregs->cr27 = cregs->gr[23];
+                       cregs->cr27 = tls;
        }
 
        return 0;