* This file handles the architecture-dependent parts of process handling..
*/
-#include <linux/config.h>
#include <linux/compiler.h>
+#include <linux/cpu.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/irq.h>
-#if defined(CONFIG_VIRT_TIMER) || defined (CONFIG_NO_IDLE_HZ)
#include <asm/timer.h>
-#endif
-asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
+asmlinkage void ret_from_fork(void) asm ("ret_from_fork");
/*
* Return saved PC of a blocked thread. used in kernel/sched.
*/
unsigned long thread_saved_pc(struct task_struct *tsk)
{
- unsigned long bc;
+ struct stack_frame *sf, *low, *high;
- bc = *((unsigned long *) tsk->thread.ksp);
-#ifndef CONFIG_ARCH_S390X
- return *((unsigned long *) (bc+56));
-#else
- return *((unsigned long *) (bc+112));
-#endif
+ if (!tsk || !task_stack_page(tsk))
+ return 0;
+ low = task_stack_page(tsk);
+ high = (struct stack_frame *) task_pt_regs(tsk);
+ sf = (struct stack_frame *) (tsk->thread.ksp & PSW_ADDR_INSN);
+ if (sf <= low || sf > high)
+ return 0;
+ sf = (struct stack_frame *) (sf->back_chain & PSW_ADDR_INSN);
+ if (sf <= low || sf > high)
+ return 0;
+ return sf->gprs[8];
}
/*
- * The idle loop on a S390...
+ * Need to know about CPUs going idle?
*/
+static ATOMIC_NOTIFIER_HEAD(idle_chain);
+
+int register_idle_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_register(&idle_chain, nb);
+}
+EXPORT_SYMBOL(register_idle_notifier);
+
+int unregister_idle_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(&idle_chain, nb);
+}
+EXPORT_SYMBOL(unregister_idle_notifier);
+
+void do_monitor_call(struct pt_regs *regs, long interruption_code)
+{
+ /* disable monitor call class 0 */
+ __ctl_clear_bit(8, 15);
+
+ atomic_notifier_call_chain(&idle_chain, CPU_NOT_IDLE,
+ (void *)(long) smp_processor_id());
+}
-void default_idle(void)
+extern void s390_handle_mcck(void);
+/*
+ * The idle loop on a S390...
+ */
+static void default_idle(void)
{
- psw_t wait_psw;
- unsigned long reg;
+ int cpu, rc;
+
+ /* CPU is going idle. */
+ cpu = smp_processor_id();
local_irq_disable();
- if (need_resched()) {
+ if (need_resched()) {
local_irq_enable();
- schedule();
- return;
- }
+ return;
+ }
-#if defined(CONFIG_VIRT_TIMER) || defined (CONFIG_NO_IDLE_HZ)
- /*
- * hook to stop timers that should not tick while CPU is idle
- */
- if (stop_timers()) {
+ rc = atomic_notifier_call_chain(&idle_chain,
+ CPU_IDLE, (void *)(long) cpu);
+ if (rc != NOTIFY_OK && rc != NOTIFY_DONE)
+ BUG();
+ if (rc != NOTIFY_OK) {
local_irq_enable();
return;
}
+
+ /* enable monitor call class 0 */
+ __ctl_set_bit(8, 15);
+
+#ifdef CONFIG_HOTPLUG_CPU
+ if (cpu_is_offline(cpu)) {
+ preempt_enable_no_resched();
+ cpu_die();
+ }
#endif
- /*
- * Wait for external, I/O or machine check interrupt and
- * switch off machine check bit after the wait has ended.
- */
- wait_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK | PSW_MASK_WAIT |
- PSW_MASK_IO | PSW_MASK_EXT;
-#ifndef CONFIG_ARCH_S390X
- asm volatile (
- " basr %0,0\n"
- "0: la %0,1f-0b(%0)\n"
- " st %0,4(%1)\n"
- " oi 4(%1),0x80\n"
- " lpsw 0(%1)\n"
- "1: la %0,2f-1b(%0)\n"
- " st %0,4(%1)\n"
- " oi 4(%1),0x80\n"
- " ni 1(%1),0xf9\n"
- " lpsw 0(%1)\n"
- "2:"
- : "=&a" (reg) : "a" (&wait_psw) : "memory", "cc" );
-#else /* CONFIG_ARCH_S390X */
- asm volatile (
- " larl %0,0f\n"
- " stg %0,8(%1)\n"
- " lpswe 0(%1)\n"
- "0: larl %0,1f\n"
- " stg %0,8(%1)\n"
- " ni 1(%1),0xf9\n"
- " lpswe 0(%1)\n"
- "1:"
- : "=&a" (reg) : "a" (&wait_psw) : "memory", "cc" );
-#endif /* CONFIG_ARCH_S390X */
+ local_mcck_disable();
+ if (test_thread_flag(TIF_MCCK_PENDING)) {
+ local_mcck_enable();
+ local_irq_enable();
+ s390_handle_mcck();
+ return;
+ }
+
+ trace_hardirqs_on();
+ /* Wait for external, I/O or machine check interrupt. */
+ __load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_WAIT |
+ PSW_MASK_IO | PSW_MASK_EXT);
}
-int cpu_idle(void)
+void cpu_idle(void)
{
- for (;;)
- default_idle();
- return 0;
+ for (;;) {
+ while (!need_resched())
+ default_idle();
+
+ preempt_enable_no_resched();
+ schedule();
+ preempt_disable();
+ }
}
void show_regs(struct pt_regs *regs)
{
struct task_struct *tsk = current;
- printk("CPU: %d %s\n", tsk->thread_info->cpu, print_tainted());
- printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
- current->comm, current->pid, (void *) tsk,
- (void *) tsk->thread.ksp);
+ printk("CPU: %d %s\n", task_thread_info(tsk)->cpu, print_tainted());
+ printk("Process %s (pid: %d[#%u], task: %p, ksp: %p)\n",
+ current->comm, current->pid, current->xid,
+ (void *) tsk, (void *) tsk->thread.ksp);
show_registers(regs);
/* Show stack backtrace if pt_regs is from kernel mode */
if (!(regs->psw.mask & PSW_MASK_PSTATE))
- show_trace(0,(unsigned long *) regs->gprs[15]);
+ show_trace(NULL, (unsigned long *) regs->gprs[15]);
}
extern void kernel_thread_starter(void);
-#ifndef CONFIG_ARCH_S390X
-
-__asm__(".align 4\n"
+asm(
+ ".align 4\n"
"kernel_thread_starter:\n"
- " l 15,0(8)\n"
- " sr 15,7\n"
- " stosm 24(15),3\n"
- " lr 2,10\n"
+ " la 2,0(10)\n"
" basr 14,9\n"
- " sr 2,2\n"
+ " la 2,0\n"
" br 11\n");
-#else /* CONFIG_ARCH_S390X */
-
-__asm__(".align 4\n"
- "kernel_thread_starter:\n"
- " lg 15,0(8)\n"
- " sgr 15,7\n"
- " stosm 48(15),3\n"
- " lgr 2,10\n"
- " basr 14,9\n"
- " sgr 2,2\n"
- " br 11\n");
-
-#endif /* CONFIG_ARCH_S390X */
-
int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
{
struct pt_regs regs;
memset(®s, 0, sizeof(regs));
- regs.psw.mask = PSW_KERNEL_BITS;
+ regs.psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
regs.psw.addr = (unsigned long) kernel_thread_starter | PSW_ADDR_AMODE;
- regs.gprs[7] = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
- regs.gprs[8] = __LC_KERNEL_STACK;
regs.gprs[9] = (unsigned long) fn;
regs.gprs[10] = (unsigned long) arg;
regs.gprs[11] = (unsigned long) do_exit;
regs.orig_gpr2 = -1;
/* Ok, create the new process.. */
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED,
+ return do_fork(flags | CLONE_VM | CLONE_UNTRACED | CLONE_KTHREAD,
0, ®s, 0, NULL, NULL);
}
void flush_thread(void)
{
-
- current->used_math = 0;
+ clear_used_math();
clear_tsk_thread_flag(current, TIF_USEDFPU);
}
unsigned long unused,
struct task_struct * p, struct pt_regs * regs)
{
- struct stack_frame
+ struct fake_frame
{
- unsigned long back_chain;
- unsigned long eos;
- unsigned long glue1;
- unsigned long glue2;
- unsigned long scratch[2];
- unsigned long gprs[10]; /* gprs 6 -15 */
- unsigned int fprs[4]; /* fpr 4 and 6 */
- unsigned int empty[4];
+ struct stack_frame sf;
struct pt_regs childregs;
} *frame;
- frame = ((struct stack_frame *)
- (THREAD_SIZE + (unsigned long) p->thread_info)) - 1;
+ frame = container_of(task_pt_regs(p), struct fake_frame, childregs);
p->thread.ksp = (unsigned long) frame;
- p->set_child_tid = p->clear_child_tid = NULL;
/* Store access registers to kernel stack of new process. */
frame->childregs = *regs;
frame->childregs.gprs[2] = 0; /* child returns 0 on fork. */
frame->childregs.gprs[15] = new_stackp;
- frame->back_chain = frame->eos = 0;
+ frame->sf.back_chain = 0;
/* new return point is ret_from_fork */
- frame->gprs[8] = (unsigned long) ret_from_fork;
+ frame->sf.gprs[8] = (unsigned long) ret_from_fork;
/* fake return stack for resume(), don't go back to schedule */
- frame->gprs[9] = (unsigned long) frame;
+ frame->sf.gprs[9] = (unsigned long) frame;
/* Save access registers to new thread structure. */
save_access_regs(&p->thread.acrs[0]);
-#ifndef CONFIG_ARCH_S390X
+#ifndef CONFIG_64BIT
/*
* save fprs to current->thread.fp_regs to merge them with
* the emulated registers and then copy the result to the child.
/* Set a new TLS ? */
if (clone_flags & CLONE_SETTLS)
p->thread.acrs[0] = regs->gprs[6];
-#else /* CONFIG_ARCH_S390X */
+#else /* CONFIG_64BIT */
/* Save the fpu registers to new thread structure. */
save_fp_regs(&p->thread.fp_regs);
p->thread.user_seg = __pa((unsigned long) p->mm->pgd) | _REGION_TABLE;
p->thread.acrs[1] = (unsigned int) regs->gprs[6];
}
}
-#endif /* CONFIG_ARCH_S390X */
+#endif /* CONFIG_64BIT */
/* start new process with ar4 pointing to the correct address space */
p->thread.mm_segment = get_fs();
/* Don't copy debug registers */
child_tidptr = (int __user *) regs.gprs[5];
if (!newsp)
newsp = regs.gprs[15];
- return do_fork(clone_flags & ~CLONE_IDLETASK, newsp, ®s, 0,
+ return do_fork(clone_flags, newsp, ®s, 0,
parent_tidptr, child_tidptr);
}
error = do_execve(filename, (char __user * __user *) regs.gprs[3],
(char __user * __user *) regs.gprs[4], ®s);
if (error == 0) {
- current->ptrace &= ~PT_DTRACE;
current->thread.fp_regs.fpc = 0;
if (MACHINE_HAS_IEEE)
asm volatile("sfpc %0,%0" : : "d" (0));
*/
int dump_fpu (struct pt_regs * regs, s390_fp_regs *fpregs)
{
-#ifndef CONFIG_ARCH_S390X
+#ifndef CONFIG_64BIT
/*
* save fprs to current->thread.fp_regs to merge them with
* the emulated registers and then copy the result to the dump.
*/
save_fp_regs(¤t->thread.fp_regs);
memcpy(fpregs, ¤t->thread.fp_regs, sizeof(s390_fp_regs));
-#else /* CONFIG_ARCH_S390X */
+#else /* CONFIG_64BIT */
save_fp_regs(fpregs);
-#endif /* CONFIG_ARCH_S390X */
+#endif /* CONFIG_64BIT */
return 1;
}
-/*
- * fill in the user structure for a core dump..
- */
-void dump_thread(struct pt_regs * regs, struct user * dump)
-{
-
-/* changed the size calculations - should hopefully work better. lbt */
- dump->magic = CMAGIC;
- dump->start_code = 0;
- dump->start_stack = regs->gprs[15] & ~(PAGE_SIZE - 1);
- dump->u_tsize = current->mm->end_code >> PAGE_SHIFT;
- dump->u_dsize = (current->mm->brk + PAGE_SIZE - 1) >> PAGE_SHIFT;
- dump->u_dsize -= dump->u_tsize;
- dump->u_ssize = 0;
- if (dump->start_stack < TASK_SIZE)
- dump->u_ssize = (TASK_SIZE - dump->start_stack) >> PAGE_SHIFT;
- memcpy(&dump->regs, regs, sizeof(s390_regs));
- dump_fpu (regs, &dump->regs.fp_regs);
- dump->regs.per_info = current->thread.per_info;
-}
-
unsigned long get_wchan(struct task_struct *p)
{
- unsigned long r14, r15, bc;
- unsigned long stack_page;
- int count = 0;
- if (!p || p == current || p->state == TASK_RUNNING)
+ struct stack_frame *sf, *low, *high;
+ unsigned long return_address;
+ int count;
+
+ if (!p || p == current || p->state == TASK_RUNNING || !task_stack_page(p))
return 0;
- stack_page = (unsigned long) p->thread_info;
- r15 = p->thread.ksp;
- if (!stack_page || r15 < stack_page ||
- r15 >= THREAD_SIZE - sizeof(unsigned long) + stack_page)
+ low = task_stack_page(p);
+ high = (struct stack_frame *) task_pt_regs(p);
+ sf = (struct stack_frame *) (p->thread.ksp & PSW_ADDR_INSN);
+ if (sf <= low || sf > high)
return 0;
- bc = (*(unsigned long *) r15) & PSW_ADDR_INSN;
- do {
- if (bc < stack_page ||
- bc >= THREAD_SIZE - sizeof(unsigned long) + stack_page)
+ for (count = 0; count < 16; count++) {
+ sf = (struct stack_frame *) (sf->back_chain & PSW_ADDR_INSN);
+ if (sf <= low || sf > high)
return 0;
-#ifndef CONFIG_ARCH_S390X
- r14 = (*(unsigned long *) (bc+56)) & PSW_ADDR_INSN;
-#else
- r14 = *(unsigned long *) (bc+112);
-#endif
- if (!in_sched_functions(r14))
- return r14;
- bc = (*(unsigned long *) bc) & PSW_ADDR_INSN;
- } while (count++ < 16);
+ return_address = sf->gprs[8] & PSW_ADDR_INSN;
+ if (!in_sched_functions(return_address))
+ return return_address;
+ }
return 0;
}
git://git.onelab.eu / linux-2.6.git / blobdiff