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Commit e60aa2fb authored by Christian Svensson's avatar Christian Svensson Committed by Stafford Horne
Browse files

openrisc: Add thread-local storage (TLS) support 



Historically OpenRISC GCC has reserved r10 which we now use to hold
the thread pointer for thread-local storage (TLS).

Signed-off-by: default avatarChristian Svensson <blue@cmd.nu>
Signed-off-by: default avatarStefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Tested-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarStafford Horne <shorne@gmail.com>
parent c7990219

arch/openrisc/kernel/process.c

+13 −0
Original line number Original line Diff line number Diff line
@@ -173,6 +173,19 @@ copy_thread(unsigned long clone_flags, unsigned long usp, 




		if (usp)

		if (usp)

			userregs->sp = 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.

		 */

		if (clone_flags & CLONE_SETTLS)

			userregs->gpr[10] = userregs->gpr[7];



		userregs->gpr[11] = 0;	/* Result from fork() */

		userregs->gpr[11] = 0;	/* Result from fork() */





		kregs->gpr[20] = 0;	/* Userspace thread */

		kregs->gpr[20] = 0;	/* Userspace thread */