diff options
| author | Christian Svensson <blue@cmd.nu> | 2014-01-25 15:48:54 +0000 |
|---|---|---|
| committer | Stafford Horne <shorne@gmail.com> | 2016-12-12 23:09:28 +0900 |
| commit | e60aa2fba4678d4e7e2d28ef4f2110084d0b150a (patch) | |
| tree | e58233bd667ed5b9f012696144c055ae10c253eb | |
| parent | c79902190f7e61fcae7c3f4b613c75062f385678 (diff) | |
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: Christian Svensson <blue@cmd.nu>
Signed-off-by: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Stafford Horne <shorne@gmail.com>
| -rw-r--r-- | arch/openrisc/kernel/process.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/openrisc/kernel/process.c b/arch/openrisc/kernel/process.c index 7095dfe7666b..277123bb4bf8 100644 --- a/arch/openrisc/kernel/process.c +++ b/arch/openrisc/kernel/process.c @@ -173,6 +173,19 @@ copy_thread(unsigned long clone_flags, unsigned long usp, if (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() */ kregs->gpr[20] = 0; /* Userspace thread */ |