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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>
This commit is contained in:
Al Viro 2012-10-06 13:52:37 -04:00 committed by Michal Simek
parent fd11ff7380
commit 2319295dd8
5 changed files with 39 additions and 58 deletions
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1
arch/microblaze/Kconfig
View File

@ -26,6 +26,7 @@ config MICROBLAZE
select GENERIC_ATOMIC64
select GENERIC_CLOCKEVENTS
select MODULES_USE_ELF_RELA
select GENERIC_KERNEL_THREAD
config SWAP
def_bool n

8
arch/microblaze/include/asm/processor.h
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@ -31,6 +31,7 @@ extern const struct seq_operations cpuinfo_op;
void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
extern void ret_from_fork(void);
extern void ret_from_kernel_thread(void);
# endif /* __ASSEMBLY__ */
@ -78,11 +79,6 @@ extern unsigned long thread_saved_pc(struct task_struct *t);
extern unsigned long get_wchan(struct task_struct *p);
/*
* create a kernel thread without removing it from tasklists
*/
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
# define KSTK_EIP(tsk) (0)
# define KSTK_ESP(tsk) (0)
@ -131,8 +127,6 @@ extern inline void release_thread(struct task_struct *dead_task)
{
}
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
/* Free current thread data structures etc. */
static inline void exit_thread(void)
{

8
arch/microblaze/kernel/entry-nommu.S
View File

@ -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

9
arch/microblaze/kernel/entry.S
View File

@ -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

71
arch/microblaze/kernel/process.c
View File

@ -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) */