[PATCH 5.4 60/78] parisc: Implement copy_thread_tls

Greg Kroah-Hartman
2020-01-14T10:05:40Z

From: Amanieu d'Antras <amanieu@gmail.com>

commit d2f36c787b2181561d8b95814f8cdad64b348ad7 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/parisc/Kconfig | 1 +
arch/parisc/kernel/process.c | 8 ++++----
2 files changed, 5 insertions(+), 4 deletions(-)

--- 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
--- 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, u
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;