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parisc: Implement copy_thread_tls

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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>
This commit is contained in:
Amanieu d'Antras
2020-01-02 18:24:10 +01:00
committed by Christian Brauner
parent 167ee0b824
commit d2f36c787b
2 changed files with 5 additions and 4 deletions
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8
arch/parisc/kernel/process.c
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@@ -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;