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s390: add stack switch helper
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -250,6 +250,55 @@ static inline unsigned short stap(void)
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return cpu_address;
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}
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#define CALL_ARGS_0() \
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register unsigned long r2 asm("2")
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#define CALL_ARGS_1(arg1) \
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register unsigned long r2 asm("2") = (unsigned long)(arg1)
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#define CALL_ARGS_2(arg1, arg2) \
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CALL_ARGS_1(arg1); \
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register unsigned long r3 asm("3") = (unsigned long)(arg2)
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#define CALL_ARGS_3(arg1, arg2, arg3) \
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CALL_ARGS_2(arg1, arg2); \
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register unsigned long r4 asm("4") = (unsigned long)(arg3)
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#define CALL_ARGS_4(arg1, arg2, arg3, arg4) \
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CALL_ARGS_3(arg1, arg2, arg3); \
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register unsigned long r4 asm("5") = (unsigned long)(arg4)
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#define CALL_ARGS_5(arg1, arg2, arg3, arg4, arg5) \
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CALL_ARGS_4(arg1, arg2, arg3, arg4); \
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register unsigned long r4 asm("6") = (unsigned long)(arg5)
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#define CALL_FMT_0
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#define CALL_FMT_1 CALL_FMT_0, "0" (r2)
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#define CALL_FMT_2 CALL_FMT_1, "d" (r3)
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#define CALL_FMT_3 CALL_FMT_2, "d" (r4)
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#define CALL_FMT_4 CALL_FMT_3, "d" (r5)
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#define CALL_FMT_5 CALL_FMT_4, "d" (r6)
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#define CALL_CLOBBER_5 "0", "1", "14", "cc", "memory"
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#define CALL_CLOBBER_4 CALL_CLOBBER_5
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#define CALL_CLOBBER_3 CALL_CLOBBER_4, "5"
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#define CALL_CLOBBER_2 CALL_CLOBBER_3, "4"
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#define CALL_CLOBBER_1 CALL_CLOBBER_2, "3"
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#define CALL_CLOBBER_0 CALL_CLOBBER_1
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#define CALL_ON_STACK(fn, stack, nr, args...) \
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({ \
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CALL_ARGS_##nr(args); \
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unsigned long prev; \
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\
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asm volatile( \
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" la %[_prev],0(15)\n" \
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" la 15,0(%[_stack])\n" \
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" stg %[_prev],%[_bc](15)\n" \
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" brasl 14,%[_fn]\n" \
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" la 15,0(%[_prev])\n" \
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: "+&d" (r2), [_prev] "=&a" (prev) \
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: [_stack] "a" (stack), \
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[_bc] "i" (offsetof(struct stack_frame, back_chain)), \
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[_fn] "X" (fn) CALL_FMT_##nr : CALL_CLOBBER_##nr); \
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r2; \
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})
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/*
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* Give up the time slice of the virtual PU.
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*/
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@ -172,15 +172,7 @@ void do_softirq_own_stack(void)
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/* Check against async. stack address range. */
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new = S390_lowcore.async_stack;
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if (((new - old) >> (PAGE_SHIFT + THREAD_SIZE_ORDER)) != 0) {
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/* Need to switch to the async. stack. */
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new -= STACK_FRAME_OVERHEAD;
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((struct stack_frame *) new)->back_chain = old;
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asm volatile(" la 15,0(%0)\n"
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" brasl 14,__do_softirq\n"
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" la 15,0(%1)\n"
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: : "a" (new), "a" (old)
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: "0", "1", "2", "3", "4", "5", "14",
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"cc", "memory" );
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CALL_ON_STACK(__do_softirq, new, 0);
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} else {
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/* We are already on the async stack. */
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__do_softirq();
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