diff options
Diffstat (limited to 'arch/xtensa/kernel/entry.S')
| -rw-r--r-- | arch/xtensa/kernel/entry.S | 41 |
1 files changed, 13 insertions, 28 deletions
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S index 18453067..d4ec138 100644 --- a/arch/xtensa/kernel/entry.S +++ b/arch/xtensa/kernel/entry.S @@ -1833,34 +1833,6 @@ ENTRY(system_call) /* - * Create a kernel thread - * - * int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) - * a2 a2 a3 a4 - */ - -ENTRY(kernel_thread) - entry a1, 16 - - mov a5, a2 # preserve fn over syscall - mov a7, a3 # preserve args over syscall - - movi a3, _CLONE_VM | _CLONE_UNTRACED - movi a2, __NR_clone - or a6, a4, a3 # arg0: flags - mov a3, a1 # arg1: sp - syscall - - beq a3, a1, 1f # branch if parent - mov a6, a7 # args - callx4 a5 # fn(args) - - movi a2, __NR_exit - syscall # return value of fn(args) still in a6 - -1: retw - -/* * Do a system call from kernel instead of calling sys_execve, so we end up * with proper pt_regs. * @@ -1958,3 +1930,16 @@ ENTRY(ret_from_fork) j common_exception_return +/* + * Kernel thread creation helper + * On entry, set up by copy_thread: a2 = thread_fn, a3 = thread_fn arg + * left from _switch_to: a6 = prev + */ +ENTRY(ret_from_kernel_thread) + + call4 schedule_tail + mov a6, a3 + callx4 a2 + call4 do_exit + +ENDPROC(ret_from_kernel_thread) |