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s390: add current_stack_pointer() helper function

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Implement current_stack_pointer() helper function and use it
everywhere, instead of having several different inline assembly
variants.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Tested-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2016-01-31 17:06:16 +01:00 committed by Martin Schwidefsky
parent 77ec8a5451
commit 76737ce17a
4 changed files with 20 additions and 16 deletions
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8
arch/s390/include/asm/processor.h
View File

@ -203,6 +203,14 @@ unsigned long get_wchan(struct task_struct *p);
/* Has task runtime instrumentation enabled ? */
#define is_ri_task(tsk) (!!(tsk)->thread.ri_cb)
static inline unsigned long current_stack_pointer(void)
{
unsigned long sp;
asm volatile("la %0,0(15)" : "=a" (sp));
return sp;
}
static inline unsigned short stap(void)
{
unsigned short cpu_address;

16
arch/s390/kernel/dumpstack.c
View File

@ -67,12 +67,11 @@ static void show_trace(struct task_struct *task, unsigned long *stack)
{
const unsigned long frame_size =
STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
register unsigned long __r15 asm ("15");
unsigned long sp;
sp = (unsigned long) stack;
if (!sp)
sp = task ? task->thread.ksp : __r15;
sp = task ? task->thread.ksp : current_stack_pointer();
printk("Call Trace:\n");
#ifdef CONFIG_CHECK_STACK
sp = __show_trace(sp,
@ -95,15 +94,16 @@ static void show_trace(struct task_struct *task, unsigned long *stack)
void show_stack(struct task_struct *task, unsigned long *sp)
{
register unsigned long *__r15 asm ("15");
unsigned long *stack;
int i;
if (!sp)
stack = task ? (unsigned long *) task->thread.ksp : __r15;
else
stack = sp;
stack = sp;
if (!stack) {
if (!task)
stack = (unsigned long *)current_stack_pointer();
else
stack = (unsigned long *)task->thread.ksp;
}
for (i = 0; i < 20; i++) {
if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
break;

3
arch/s390/kernel/irq.c
View File

@ -164,8 +164,7 @@ void do_softirq_own_stack(void)
{
unsigned long old, new;
/* Get current stack pointer. */
asm volatile("la %0,0(15)" : "=a" (old));
old = current_stack_pointer();
/* Check against async. stack address range. */
new = S390_lowcore.async_stack;
if (((new - old) >> (PAGE_SHIFT + THREAD_ORDER)) != 0) {

9
arch/s390/kernel/stacktrace.c
View File

@ -77,10 +77,9 @@ static void __save_stack_trace(struct stack_trace *trace, unsigned long sp)
void save_stack_trace(struct stack_trace *trace)
{
register unsigned long r15 asm ("15");
unsigned long sp;
sp = r15;
sp = current_stack_pointer();
__save_stack_trace(trace, sp);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
@ -92,10 +91,8 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
unsigned long sp, low, high;
sp = tsk->thread.ksp;
if (tsk == current) {
/* Get current stack pointer. */
asm volatile("la %0,0(15)" : "=a" (sp));
}
if (tsk == current)
sp = current_stack_pointer();
low = (unsigned long) task_stack_page(tsk);
high = (unsigned long) task_pt_regs(tsk);
save_context_stack(trace, sp, low, high, 1);