Commit e60aa2fb authored by Christian Svensson's avatar Christian Svensson Committed by Stafford Horne
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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
......@@ -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 */
......
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