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xtensa: Implement copy_thread_tls

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commit c346b94f8c5d1b7d637522c908209de93305a8eb upstream.

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

Signed-off-by: Amanieu d'Antras <[email protected]>
Cc: [email protected]
Cc: <[email protected]> # 5.3.x
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Christian Brauner <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Amanieu d'Antras 2020-01-02 18:24:12 +01:00 • committed by Greg Kroah-Hartman
commit 3981d85a91
2 changed files with 5 additions and 4 deletions
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1
arch/xtensa/Kconfig
View file

@ -22,6 +22,7 @@ config XTENSA
select HAVE_ARCH_JUMP_LABEL
select HAVE_ARCH_KASAN if MMU
select HAVE_ARCH_TRACEHOOK
select HAVE_COPY_THREAD_TLS
select HAVE_DEBUG_KMEMLEAK
select HAVE_DMA_CONTIGUOUS
select HAVE_EXIT_THREAD

8
arch/xtensa/kernel/process.c
View file

@ -202,8 +202,9 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
* involved. Much simpler to just not copy those live frames across.
*/
int copy_thread(unsigned long clone_flags, unsigned long usp_thread_fn,
unsigned long thread_fn_arg, struct task_struct *p)
int copy_thread_tls(unsigned long clone_flags, unsigned long usp_thread_fn,
unsigned long thread_fn_arg, struct task_struct *p,
unsigned long tls)
{
struct pt_regs *childregs = task_pt_regs(p);
@ -264,9 +265,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp_thread_fn,
&regs->areg[XCHAL_NUM_AREGS - len/4], len);
}
/* The thread pointer is passed in the '4th argument' (= a5) */
if (clone_flags & CLONE_SETTLS)
childregs->threadptr = childregs->areg[5];
childregs->threadptr = tls;
} else {
p->thread.ra = MAKE_RA_FOR_CALL(
(unsigned long)ret_from_kernel_thread, 1);