Unverified Commit 20bda4ed authored by Amanieu d'Antras's avatar Amanieu d'Antras Committed by Christian Brauner
Browse files

riscv: Implement copy_thread_tls 



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

Signed-off-by: default avatarAmanieu d'Antras <amanieu@gmail.com>
Cc: linux-riscv@lists.infradead.org
Cc: <stable@vger.kernel.org> # 5.3.x
Link: https://lore.kernel.org/r/20200102172413.654385-6-amanieu@gmail.com


Signed-off-by: default avatarChristian Brauner <christian.brauner@ubuntu.com>
parent d2f36c78

arch/riscv/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -65,6 +65,7 @@ config RISCV 
	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU

	select HAVE_ARCH_MMAP_RND_BITS if MMU

	select ARCH_HAS_GCOV_PROFILE_ALL

	select HAVE_COPY_THREAD_TLS



config ARCH_MMAP_RND_BITS_MIN

	default 18 if 64BIT

arch/riscv/kernel/process.c

+3 −3
Original line number Diff line number Diff line
@@ -99,8 +99,8 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) 
	return 0;

}



int copy_thread(unsigned long clone_flags, unsigned long usp,

	unsigned long arg, struct task_struct *p)

int copy_thread_tls(unsigned long clone_flags, unsigned long usp,

	unsigned long arg, struct task_struct *p, unsigned long tls)

{

	struct pt_regs *childregs = task_pt_regs(p);
@@ -121,7 +121,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, 
		if (usp) /* User fork */

			childregs->sp = usp;

		if (clone_flags & CLONE_SETTLS)

			childregs->tp = childregs->a5;

			childregs->tp = tls;

		childregs->a0 = 0; /* Return value of fork() */

		p->thread.ra = (unsigned long)ret_from_fork;

	}

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