/*
- * arch/s390/kernel/process.c
+ * This file handles the architecture dependent parts of process handling.
*
- * S390 version
- * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
- * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
- * Hartmut Penner (hp@de.ibm.com),
- * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
- *
- * Derived from "arch/i386/kernel/process.c"
- * Copyright (C) 1995, Linus Torvalds
- */
-
-/*
- * This file handles the architecture-dependent parts of process handling..
+ * Copyright IBM Corp. 1999,2009
+ * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
+ * Hartmut Penner <hp@de.ibm.com>,
+ * Denis Joseph Barrow,
*/
-#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/mm.h>
+#include <linux/fs.h>
#include <linux/smp.h>
-#include <linux/smp_lock.h>
#include <linux/stddef.h>
+#include <linux/slab.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
-#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/user.h>
-#include <linux/a.out.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/notifier.h>
-
+#include <linux/tick.h>
+#include <linux/elfcore.h>
+#include <linux/kernel_stat.h>
+#include <linux/syscalls.h>
+#include <linux/compat.h>
+#include <asm/compat.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/irq.h>
#include <asm/timer.h>
+#include <asm/nmi.h>
+#include "entry.h"
-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)
{
- struct stack_frame *sf;
+ struct stack_frame *sf, *low, *high;
- sf = (struct stack_frame *) tsk->thread.ksp;
- sf = (struct stack_frame *) sf->back_chain;
+ 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];
}
/*
- * Need to know about CPUs going idle?
- */
-static struct notifier_block *idle_chain;
-
-int register_idle_notifier(struct notifier_block *nb)
-{
- return notifier_chain_register(&idle_chain, nb);
-}
-EXPORT_SYMBOL(register_idle_notifier);
-
-int unregister_idle_notifier(struct notifier_block *nb)
-{
- return 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);
-
- notifier_call_chain(&idle_chain, CPU_NOT_IDLE,
- (void *)(long) smp_processor_id());
-}
-
-extern void s390_handle_mcck(void);
-/*
* The idle loop on a S390...
*/
-void default_idle(void)
+static void default_idle(void)
{
- int cpu, rc;
-
/* CPU is going idle. */
- cpu = smp_processor_id();
-
local_irq_disable();
if (need_resched()) {
local_irq_enable();
return;
}
-
- rc = 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))
+ if (cpu_is_offline(smp_processor_id())) {
+ preempt_enable_no_resched();
cpu_die();
+ }
#endif
-
local_mcck_disable();
if (test_thread_flag(TIF_MCCK_PENDING)) {
local_mcck_enable();
s390_handle_mcck();
return;
}
-
- /* Wait for external, I/O or machine check interrupt. */
- __load_psw_mask(PSW_KERNEL_BITS | PSW_MASK_WAIT |
- PSW_MASK_IO | PSW_MASK_EXT);
+ trace_hardirqs_on();
+ /* Don't trace preempt off for idle. */
+ stop_critical_timings();
+ /* Stop virtual timer and halt the cpu. */
+ vtime_stop_cpu();
+ /* Reenable preemption tracer. */
+ start_critical_timings();
}
void cpu_idle(void)
{
for (;;) {
+ tick_nohz_stop_sched_tick(1);
while (!need_resched())
default_idle();
-
+ tick_nohz_restart_sched_tick();
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);
-
- 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]);
-}
-
extern void kernel_thread_starter(void);
-__asm__(".align 4\n"
+asm(
+ ".align 4\n"
"kernel_thread_starter:\n"
" la 2,0(10)\n"
" basr 14,9\n"
struct pt_regs regs;
memset(®s, 0, sizeof(regs));
- regs.psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
+ 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[9] = (unsigned long) fn;
regs.gprs[10] = (unsigned long) arg;
return do_fork(flags | CLONE_VM | CLONE_UNTRACED,
0, ®s, 0, NULL, NULL);
}
+EXPORT_SYMBOL(kernel_thread);
/*
* Free current thread data structures etc..
void flush_thread(void)
{
- clear_used_math();
- clear_tsk_thread_flag(current, TIF_USEDFPU);
}
void release_thread(struct task_struct *dead_task)
{
}
-int copy_thread(int nr, unsigned long clone_flags, unsigned long new_stackp,
- unsigned long unused,
- struct task_struct * p, struct pt_regs * regs)
+int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
+ unsigned long unused,
+ struct task_struct *p, struct pt_regs *regs)
{
- struct fake_frame
- {
- struct stack_frame sf;
- struct pt_regs childregs;
- } *frame;
-
- frame = ((struct fake_frame *)
- (THREAD_SIZE + (unsigned long) p->thread_info)) - 1;
- p->thread.ksp = (unsigned long) frame;
+ struct thread_info *ti;
+ struct fake_frame
+ {
+ struct stack_frame sf;
+ struct pt_regs childregs;
+ } *frame;
+
+ frame = container_of(task_pt_regs(p), struct fake_frame, childregs);
+ p->thread.ksp = (unsigned long) frame;
/* Store access registers to kernel stack of new process. */
- frame->childregs = *regs;
+ frame->childregs = *regs;
frame->childregs.gprs[2] = 0; /* child returns 0 on fork. */
- frame->childregs.gprs[15] = new_stackp;
- frame->sf.back_chain = 0;
+ frame->childregs.gprs[15] = new_stackp;
+ frame->sf.back_chain = 0;
- /* new return point is ret_from_fork */
- frame->sf.gprs[8] = (unsigned long) ret_from_fork;
+ /* new return point is ret_from_fork */
+ frame->sf.gprs[8] = (unsigned long) ret_from_fork;
- /* fake return stack for resume(), don't go back to schedule */
- frame->sf.gprs[9] = (unsigned long) frame;
+ /* fake return stack for resume(), don't go back to schedule */
+ 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.
*/
save_fp_regs(¤t->thread.fp_regs);
memcpy(&p->thread.fp_regs, ¤t->thread.fp_regs,
sizeof(s390_fp_regs));
- p->thread.user_seg = __pa((unsigned long) p->mm->pgd) | _SEGMENT_TABLE;
/* 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;
/* Set a new TLS ? */
if (clone_flags & CLONE_SETTLS) {
- if (test_thread_flag(TIF_31BIT)) {
+ if (is_compat_task()) {
p->thread.acrs[0] = (unsigned int) regs->gprs[6];
} else {
p->thread.acrs[0] = (unsigned int)(regs->gprs[6] >> 32);
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 */
- memset(&p->thread.per_info,0,sizeof(p->thread.per_info));
-
- return 0;
+ /* Don't copy debug registers */
+ memset(&p->thread.per_info, 0, sizeof(p->thread.per_info));
+ clear_tsk_thread_flag(p, TIF_SINGLE_STEP);
+ /* Initialize per thread user and system timer values */
+ ti = task_thread_info(p);
+ ti->user_timer = 0;
+ ti->system_timer = 0;
+ return 0;
}
-asmlinkage long sys_fork(struct pt_regs regs)
+SYSCALL_DEFINE0(fork)
{
- return do_fork(SIGCHLD, regs.gprs[15], ®s, 0, NULL, NULL);
+ struct pt_regs *regs = task_pt_regs(current);
+ return do_fork(SIGCHLD, regs->gprs[15], regs, 0, NULL, NULL);
}
-asmlinkage long sys_clone(struct pt_regs regs)
+SYSCALL_DEFINE4(clone, unsigned long, newsp, unsigned long, clone_flags,
+ int __user *, parent_tidptr, int __user *, child_tidptr)
{
- unsigned long clone_flags;
- unsigned long newsp;
- int __user *parent_tidptr, *child_tidptr;
+ struct pt_regs *regs = task_pt_regs(current);
- clone_flags = regs.gprs[3];
- newsp = regs.orig_gpr2;
- parent_tidptr = (int __user *) regs.gprs[4];
- child_tidptr = (int __user *) regs.gprs[5];
- if (!newsp)
- newsp = regs.gprs[15];
- return do_fork(clone_flags, newsp, ®s, 0,
+ if (!newsp)
+ newsp = regs->gprs[15];
+ return do_fork(clone_flags, newsp, regs, 0,
parent_tidptr, child_tidptr);
}
* do not have enough call-clobbered registers to hold all
* the information you need.
*/
-asmlinkage long sys_vfork(struct pt_regs regs)
+SYSCALL_DEFINE0(vfork)
{
+ struct pt_regs *regs = task_pt_regs(current);
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
- regs.gprs[15], ®s, 0, NULL, NULL);
+ regs->gprs[15], regs, 0, NULL, NULL);
+}
+
+asmlinkage void execve_tail(void)
+{
+ current->thread.fp_regs.fpc = 0;
+ if (MACHINE_HAS_IEEE)
+ asm volatile("sfpc %0,%0" : : "d" (0));
}
/*
* sys_execve() executes a new program.
*/
-asmlinkage long sys_execve(struct pt_regs regs)
+SYSCALL_DEFINE3(execve, char __user *, name, char __user * __user *, argv,
+ char __user * __user *, envp)
{
- int error;
- char * filename;
-
- filename = getname((char __user *) regs.orig_gpr2);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
- error = do_execve(filename, (char __user * __user *) regs.gprs[3],
- (char __user * __user *) regs.gprs[4], ®s);
- if (error == 0) {
- task_lock(current);
- current->ptrace &= ~PT_DTRACE;
- task_unlock(current);
- current->thread.fp_regs.fpc = 0;
- if (MACHINE_HAS_IEEE)
- asm volatile("sfpc %0,%0" : : "d" (0));
- }
- putname(filename);
+ struct pt_regs *regs = task_pt_regs(current);
+ char *filename;
+ long rc;
+
+ filename = getname(name);
+ rc = PTR_ERR(filename);
+ if (IS_ERR(filename))
+ return rc;
+ rc = do_execve(filename, argv, envp, regs);
+ if (rc)
+ goto out;
+ execve_tail();
+ rc = regs->gprs[2];
out:
- return error;
+ putname(filename);
+ return rc;
}
-
/*
* fill in the FPU structure for a core dump.
*/
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;
-}
+EXPORT_SYMBOL(dump_fpu);
unsigned long get_wchan(struct task_struct *p)
{
unsigned long return_address;
int count;
- if (!p || p == current || p->state == TASK_RUNNING || !p->thread_info)
+ if (!p || p == current || p->state == TASK_RUNNING || !task_stack_page(p))
return 0;
- low = (struct stack_frame *) p->thread_info;
- high = (struct stack_frame *)
- ((unsigned long) p->thread_info + THREAD_SIZE) - 1;
+ 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;
}
return 0;
}
-
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff