tile: support GENERIC_KERNEL_THREAD and GENERIC_KERNEL_EXECVE (0f8b9838) · Commits · 戴 / test

arch/tile/Kconfig

+2 −0

Original line number	Diff line number	Diff line
		@@ -21,6 +21,8 @@ config TILE
		select ARCH_HAVE_NMI_SAFE_CMPXCHG
		select GENERIC_CLOCKEVENTS
		select MODULES_USE_ELF_RELA
		select GENERIC_KERNEL_THREAD
		select GENERIC_KERNEL_EXECVE

		# FIXME: investigate whether we need/want these options.
		# select HAVE_IOREMAP_PROT

+4 −1

Original line number	Diff line number	Diff line
		@@ -68,7 +68,10 @@ extern unsigned long get_switch_to_pc(void);
		/* Support function for forking a new task. */
		void ret_from_fork(void);

		/* Called from ret_from_fork() when a new process starts up. */
		/* Support function for forking a new kernel thread. */
		void ret_from_kernel_thread(void fn, void arg);

		/* Called from ret_from_xxx() when a new process starts up. */
		struct task_struct sim_notify_fork(struct task_struct prev);

		#endif /* !__ASSEMBLY__ */

+0 −11

Original line number	Diff line number	Diff line
		@@ -27,17 +27,6 @@ STD_ENTRY(current_text_addr)
		{ move r0, lr; jrp lr }
		STD_ENDPROC(current_text_addr)

		/*
		* Implement execve(). The i386 code has a note that forking from kernel
		* space results in no copy on write until the execve, so we should be
		* careful not to write to the stack here.
		*/
		STD_ENTRY(kernel_execve)
		moveli TREG_SYSCALL_NR_NAME, __NR_execve
		swint1
		jrp lr
		STD_ENDPROC(kernel_execve)

		/*
		* We don't run this function directly, but instead copy it to a page
		* we map into every user process. See vdso_setup().

+15 −0

Original line number	Diff line number	Diff line
		@@ -1291,6 +1291,21 @@ STD_ENTRY(ret_from_fork)
		}
		STD_ENDPROC(ret_from_fork)

		STD_ENTRY(ret_from_kernel_thread)
		jal sim_notify_fork
		jal schedule_tail
		FEEDBACK_REENTER(ret_from_fork)
		{
		move r0, r31
		jalr r30
		}
		FEEDBACK_REENTER(ret_from_kernel_thread)
		{
		movei r30, 0 /* not an NMI */
		j .Lresume_userspace /* jump into middle of interrupt_return */
		}
		STD_ENDPROC(ret_from_kernel_thread)

		/*
		* Code for ill interrupt.
		*/

+15 −0

Original line number	Diff line number	Diff line
		@@ -1150,6 +1150,21 @@ STD_ENTRY(ret_from_fork)
		}
		STD_ENDPROC(ret_from_fork)

		STD_ENTRY(ret_from_kernel_thread)
		jal sim_notify_fork
		jal schedule_tail
		FEEDBACK_REENTER(ret_from_fork)
		{
		move r0, r31
		jalr r30
		}
		FEEDBACK_REENTER(ret_from_kernel_thread)
		{
		movei r30, 0 /* not an NMI */
		j .Lresume_userspace /* jump into middle of interrupt_return */
		}
		STD_ENDPROC(ret_from_kernel_thread)

		/* Various stub interrupt handlers and syscall handlers */

		STD_ENTRY_LOCAL(_kernel_double_fault)