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authorAl Viro <viro@zeniv.linux.org.uk>2012-10-06 13:52:37 -0400
committerMichal Simek <michal.simek@xilinx.com>2012-11-16 08:44:57 +0100
commit2319295dd8dbd076afa136bffb797ef726b605a0 (patch)
tree9699149edbd77d16d8c41914677068ab6cde167c /arch/microblaze/kernel
parentfd11ff7380fe7c61f55e6caf33982edeab3fbc19 (diff)
downloadlinux-linaro-stable-2319295dd8dbd076afa136bffb797ef726b605a0.tar.gz
microblaze: switch to generic kernel_thread()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Diffstat (limited to 'arch/microblaze/kernel')
-rw-r--r--arch/microblaze/kernel/entry-nommu.S8
-rw-r--r--arch/microblaze/kernel/entry.S9
-rw-r--r--arch/microblaze/kernel/process.c71
3 files changed, 37 insertions, 51 deletions
diff --git a/arch/microblaze/kernel/entry-nommu.S b/arch/microblaze/kernel/entry-nommu.S
index 75c3ea1f48a1..c47e92cd7e78 100644
--- a/arch/microblaze/kernel/entry-nommu.S
+++ b/arch/microblaze/kernel/entry-nommu.S
@@ -474,6 +474,14 @@ ENTRY(ret_from_fork)
brid ret_to_user
nop
+ENTRY(ret_from_kernel_thread)
+ brlid r15, schedule_tail
+ addk r5, r0, r3
+ brald r15, r20
+ addk r5, r0, r19
+ brid sys_exit /* won't be returning... */
+ addk r5, r0, r0
+
work_pending:
enable_irq
diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S
index 1cf702ab7463..be76d1338be0 100644
--- a/arch/microblaze/kernel/entry.S
+++ b/arch/microblaze/kernel/entry.S
@@ -484,6 +484,15 @@ C_ENTRY(ret_from_fork):
brid ret_from_trap; /* Do normal trap return */
add r3, r0, r0; /* Child's fork call should return 0. */
+C_ENTRY(ret_from_kernel_thread):
+ bralid r15, schedule_tail; /* ...which is schedule_tail's arg */
+ add r5, r3, r0; /* switch_thread returns the prev task */
+ /* ( in the delay slot ) */
+ brald r15, r20 /* fn was left in r20 */
+ addk r5, r0, r19 /* ... and argument - in r19 */
+ brid sys_exit /* won't be returning... */
+ addk r5, r0, r0
+
C_ENTRY(sys_vfork):
brid microblaze_vfork /* Do real work (tail-call) */
addik r5, r1, 0
diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c
index 1944e00f07e1..cbf8bb92f159 100644
--- a/arch/microblaze/kernel/process.c
+++ b/arch/microblaze/kernel/process.c
@@ -119,46 +119,38 @@ void flush_thread(void)
}
int copy_thread(unsigned long clone_flags, unsigned long usp,
- unsigned long unused,
+ unsigned long arg,
struct task_struct *p, struct pt_regs *regs)
{
struct pt_regs *childregs = task_pt_regs(p);
struct thread_info *ti = task_thread_info(p);
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ /* if we're creating a new kernel thread then just zeroing all
+ * the registers. That's OK for a brand new thread.*/
+ memset(childregs, 0, sizeof(struct pt_regs));
+ memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
+ ti->cpu_context.r1 = (unsigned long)childregs;
+ ti->cpu_context.r20 = (unsigned long)usp; /* fn */
+ ti->cpu_context.r19 = (unsigned long)arg;
+ childregs->pt_mode = 1;
+ local_save_flags(childregs->msr);
+#ifdef CONFIG_MMU
+ ti->cpu_context.msr = childregs->msr & ~MSR_IE;
+#endif
+ ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8;
+ return 0;
+ }
*childregs = *regs;
- if (user_mode(regs))
- childregs->r1 = usp;
- else
- childregs->r1 = ((unsigned long) ti) + THREAD_SIZE;
+ childregs->r1 = usp;
-#ifndef CONFIG_MMU
memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
ti->cpu_context.r1 = (unsigned long)childregs;
+#ifndef CONFIG_MMU
ti->cpu_context.msr = (unsigned long)childregs->msr;
#else
+ childregs->msr |= MSR_UMS;
- /* if creating a kernel thread then update the current reg (we don't
- * want to use the parent's value when restoring by POP_STATE) */
- if (kernel_mode(regs))
- /* save new current on stack to use POP_STATE */
- childregs->CURRENT_TASK = (unsigned long)p;
- /* if returning to user then use the parent's value of this register */
-
- /* if we're creating a new kernel thread then just zeroing all
- * the registers. That's OK for a brand new thread.*/
- /* Pls. note that some of them will be restored in POP_STATE */
- if (kernel_mode(regs))
- memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
- /* if this thread is created for fork/vfork/clone, then we want to
- * restore all the parent's context */
- /* in addition to the registers which will be restored by POP_STATE */
- else {
- ti->cpu_context = *(struct cpu_context *)regs;
- childregs->msr |= MSR_UMS;
- }
-
- /* FIXME STATE_SAVE_PT_OFFSET; */
- ti->cpu_context.r1 = (unsigned long)childregs;
/* we should consider the fact that childregs is a copy of the parent
* regs which were saved immediately after entering the kernel state
* before enabling VM. This MSR will be restored in switch_to and
@@ -209,29 +201,6 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
}
#endif
-static void kernel_thread_helper(int (*fn)(void *), void *arg)
-{
- fn(arg);
- do_exit(-1);
-}
-
-int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(&regs, 0, sizeof(regs));
- /* store them in non-volatile registers */
- regs.r5 = (unsigned long)fn;
- regs.r6 = (unsigned long)arg;
- local_save_flags(regs.msr);
- regs.pc = (unsigned long)kernel_thread_helper;
- regs.pt_mode = 1;
-
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
- &regs, 0, NULL, NULL);
-}
-EXPORT_SYMBOL_GPL(kernel_thread);
-
unsigned long get_wchan(struct task_struct *p)
{
/* TBD (used by procfs) */