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Commit 0f8b9838 authored by Chris Metcalf's avatar Chris Metcalf Committed by Al Viro
Browse files

tile: support GENERIC_KERNEL_THREAD and GENERIC_KERNEL_EXECVE 



Also provide an optimized current_pt_regs() while we're at it.

Signed-off-by: default avatarChris Metcalf <cmetcalf@tilera.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 733deca1

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

arch/tile/include/asm/switch_to.h

+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__ */

arch/tile/kernel/entry.S

+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().

arch/tile/kernel/intvec_32.S

+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.

	 */

arch/tile/kernel/intvec_64.S

+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)