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openrisc: Convert copy_thread to 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: Stafford Horne <shorne@gmail.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Stafford Horne 2020-02-25 19:04:17 +09:00
parent fc74d71660
commit 0d4e1bb106
2 changed files with 7 additions and 11 deletions
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1
arch/openrisc/Kconfig
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@ -14,6 +14,7 @@ config OPENRISC
select HANDLE_DOMAIN_IRQ
select GPIOLIB
select HAVE_ARCH_TRACEHOOK
select HAVE_COPY_THREAD_TLS
select SPARSE_IRQ
select GENERIC_IRQ_CHIP
select GENERIC_IRQ_PROBE

17
arch/openrisc/kernel/process.c
View File

@ -117,12 +117,13 @@ void release_thread(struct task_struct *dead_task)
extern asmlinkage void ret_from_fork(void);
/*
* copy_thread
* copy_thread_tls
* @clone_flags: flags
* @usp: user stack pointer or fn for kernel thread
* @arg: arg to fn for kernel thread; always NULL for userspace thread
* @p: the newly created task
* @regs: CPU context to copy for userspace thread; always NULL for kthread
* @tls: the Thread Local Storage pointer for the new process
*
* At the top of a newly initialized kernel stack are two stacked pt_reg
* structures. The first (topmost) is the userspace context of the thread.
@ -148,8 +149,8 @@ extern asmlinkage void ret_from_fork(void);
*/
int
copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long arg, struct task_struct *p)
copy_thread_tls(unsigned long clone_flags, unsigned long usp,
unsigned long arg, struct task_struct *p, unsigned long tls)
{
struct pt_regs *userregs;
struct pt_regs *kregs;
@ -179,16 +180,10 @@ copy_thread(unsigned long clone_flags, unsigned long 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.
* For CLONE_SETTLS set "tp" (r10) to the TLS pointer.
*/
if (clone_flags & CLONE_SETTLS)
userregs->gpr[10] = userregs->gpr[7];
userregs->gpr[10] = tls;
userregs->gpr[11] = 0; /* Result from fork() */