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authorStafford Horne <shorne@gmail.com>2020-02-25 19:04:17 +0900
committerStafford Horne <shorne@gmail.com>2020-03-02 18:10:45 +0900
commit0d4e1bb1062481c43c01dd20fd4c40544441739f (patch)
tree81ae07cf9a6997bbd22fb96eb93b051c6b5a6850 /arch/openrisc
parentfc74d716600545304a066bfd9d54cbd07e531701 (diff)
openrisc: Convert copy_thread to copy_thread_tls
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>
Diffstat (limited to 'arch/openrisc')
-rw-r--r--arch/openrisc/Kconfig1
-rw-r--r--arch/openrisc/kernel/process.c17
2 files changed, 7 insertions, 11 deletions
diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index 1928e061ff96..5debdbe6fc35 100644
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig
@@ -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
diff --git a/arch/openrisc/kernel/process.c b/arch/openrisc/kernel/process.c
index b06f84f6676f..5caa47f7de4f 100644
--- a/arch/openrisc/kernel/process.c
+++ b/arch/openrisc/kernel/process.c
@@ -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() */

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