Release 4.14 arch/um/kernel/process.c

Directory: arch/um/kernel
/*
 * Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk})
 * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Copyright 2003 PathScale, Inc.
 * Licensed under the GPL
 */

#include <linux/stddef.h>
#include <linux/err.h>
#include <linux/hardirq.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/personality.h>
#include <linux/proc_fs.h>
#include <linux/ptrace.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/sched/task.h>
#include <linux/sched/task_stack.h>
#include <linux/seq_file.h>
#include <linux/tick.h>
#include <linux/threads.h>
#include <linux/tracehook.h>
#include <asm/current.h>
#include <asm/pgtable.h>
#include <asm/mmu_context.h>
#include <linux/uaccess.h>
#include <as-layout.h>
#include <kern_util.h>
#include <os.h>
#include <skas.h>
#include <timer-internal.h>

/*
 * This is a per-cpu array.  A processor only modifies its entry and it only
 * cares about its entry, so it's OK if another processor is modifying its
 * entry.
 */

struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } };



static inline int external_pid(void)
{
	/* FIXME: Need to look up userspace_pid by cpu */
	return userspace_pid[0];
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 15 93.75% 3 75.00%
Karol Swietlicki 1 6.25% 1 25.00%
Total 16 100.00% 4 100.00%



int pid_to_processor_id(int pid)
{
	int i;

	for (i = 0; i < ncpus; i++) {
		if (cpu_tasks[i].pid == pid)
			return i;
	}
	return -1;
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 44 100.00% 2 100.00%
Total 44 100.00% 2 100.00%



void free_stack(unsigned long stack, int order)
{
	free_pages(stack, order);
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%



unsigned long alloc_stack(int order, int atomic)
{
	unsigned long page;
	gfp_t flags = GFP_KERNEL;

	if (atomic)
		flags = GFP_ATOMIC;
	page = __get_free_pages(flags, order);

	return page;
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 38 92.68% 1 25.00%
Paolo 'Blaisorblade' Giarrusso 2 4.88% 2 50.00%
Al Viro 1 2.44% 1 25.00%
Total 41 100.00% 4 100.00%



static inline void set_current(struct task_struct *task)
{
	cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task)
		{ external_pid(), task });
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 31 88.57% 3 60.00%
Al Viro 3 8.57% 1 20.00%
Karol Swietlicki 1 2.86% 1 20.00%
Total 35 100.00% 5 100.00%

extern void arch_switch_to(struct task_struct *to);



void *__switch_to(struct task_struct *from, struct task_struct *to)
{
	to->thread.prev_sched = from;
	set_current(to);

	switch_threads(&from->thread.switch_buf, &to->thread.switch_buf);
	arch_switch_to(current);

	return current->thread.prev_sched;
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 54 93.10% 4 80.00%
Richard Weinberger 4 6.90% 1 20.00%
Total 58 100.00% 5 100.00%



void interrupt_end(void)
{
	struct pt_regs *regs = &current->thread.regs;

	if (need_resched())
		schedule();
	if (test_thread_flag(TIF_SIGPENDING))
		do_signal(regs);
	if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME))
		tracehook_notify_resume(regs);
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 23 45.10% 1 33.33%
Ingo Molnar 15 29.41% 1 33.33%
Al Viro 13 25.49% 1 33.33%
Total 51 100.00% 3 100.00%



int get_current_pid(void)
{
	return task_pid_nr(current);
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 8 61.54% 2 66.67%
Al Viro 5 38.46% 1 33.33%
Total 13 100.00% 3 100.00%

/*
 * This is called magically, by its address being stuffed in a jmp_buf
 * and being longjmp-d to.
 */


void new_thread_handler(void)
{
	int (*fn)(void *), n;
	void *arg;

	if (current->thread.prev_sched != NULL)
		schedule_tail(current->thread.prev_sched);
	current->thread.prev_sched = NULL;

	fn = current->thread.request.u.thread.proc;
	arg = current->thread.request.u.thread.arg;

	/*
         * callback returns only if the kernel thread execs a process
         */
	n = fn(arg);
	userspace(&current->thread.regs.regs, current_thread_info()->aux_fp_regs);
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 96 93.20% 2 50.00%
Thomas Meyer 5 4.85% 1 25.00%
Al Viro 2 1.94% 1 25.00%
Total 103 100.00% 4 100.00%

/* Called magically, see new_thread_handler above */


void fork_handler(void)
{
	force_flush_all();

	schedule_tail(current->thread.prev_sched);

	/*
         * XXX: if interrupt_end() calls schedule, this call to
         * arch_switch_to isn't needed. We could want to apply this to
         * improve performance. -bb
         */
	arch_switch_to(current);

	current->thread.prev_sched = NULL;

	userspace(&current->thread.regs.regs, current_thread_info()->aux_fp_regs);
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 45 90.00% 4 80.00%
Thomas Meyer 5 10.00% 1 20.00%
Total 50 100.00% 5 100.00%



int copy_thread(unsigned long clone_flags, unsigned long sp,
		unsigned long arg, struct task_struct * p)
{
	void (*handler)(void);
	int kthread = current->flags & PF_KTHREAD;
	int ret = 0;

	p->thread = (struct thread_struct) INIT_THREAD;

	if (!kthread) {
	  	memcpy(&p->thread.regs.regs, current_pt_regs(),
		       sizeof(p->thread.regs.regs));
		PT_REGS_SET_SYSCALL_RETURN(&p->thread.regs, 0);
		if (sp != 0)
			REGS_SP(p->thread.regs.regs.gp) = sp;

		handler = fork_handler;

		arch_copy_thread(&current->thread.arch, &p->thread.arch);
	} else {
		get_safe_registers(p->thread.regs.regs.gp, p->thread.regs.regs.fp);
		p->thread.request.u.thread.proc = (int (*)(void *))sp;
		p->thread.request.u.thread.arg = (void *)arg;
		handler = new_thread_handler;
	}

	new_thread(task_stack_page(p), &p->thread.switch_buf, handler);

	if (!kthread) {
		clear_flushed_tls(p);

		/*
                 * Set a new TLS for the child thread?
                 */
		if (clone_flags & CLONE_SETTLS)
			ret = arch_copy_tls(p);
	}

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 182 70.00% 6 46.15%
Al Viro 41 15.77% 5 38.46%
Paolo 'Blaisorblade' Giarrusso 27 10.38% 1 7.69%
Ingo van Lil 10 3.85% 1 7.69%
Total 260 100.00% 13 100.00%



void initial_thread_cb(void (*proc)(void *), void *arg)
{
	int save_kmalloc_ok = kmalloc_ok;

	kmalloc_ok = 0;
	initial_thread_cb_skas(proc, arg);
	kmalloc_ok = save_kmalloc_ok;
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 39 100.00% 4 100.00%
Total 39 100.00% 4 100.00%



void arch_cpu_idle(void)
{
	cpu_tasks[current_thread_info()->cpu].pid = os_getpid();
	os_idle_sleep(UM_NSEC_PER_SEC);
	local_irq_enable();
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 21 75.00% 4 66.67%
Richard Weinberger 5 17.86% 1 16.67%
Anton Ivanov 2 7.14% 1 16.67%
Total 28 100.00% 6 100.00%



int __cant_sleep(void) {
	return in_atomic() || irqs_disabled() || in_interrupt();
	/* Is in_interrupt() really needed? */
}

Contributors
Person Tokens Prop Commits CommitProp
Paolo 'Blaisorblade' Giarrusso 18 100.00% 1 100.00%
Total 18 100.00% 1 100.00%



int user_context(unsigned long sp)
{
	unsigned long stack;

	stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);
	return stack != (unsigned long) current_thread_info();
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 33 100.00% 5 100.00%
Total 33 100.00% 5 100.00%

extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end;



void do_uml_exitcalls(void)
{
	exitcall_t *call;

	call = &__uml_exitcall_end;
	while (--call >= &__uml_exitcall_begin)
		(*call)();
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 30 100.00% 2 100.00%
Total 30 100.00% 2 100.00%



char *uml_strdup(const char *string)
{
	return kstrdup(string, GFP_KERNEL);
}
Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 16 84.21% 2 50.00%
Robert Love 2 10.53% 1 25.00%
Américo Wang 1 5.26% 1 25.00%
Total 19 100.00% 4 100.00%


EXPORT_SYMBOL(uml_strdup);



int copy_to_user_proc(void __user *to, void *from, int size)
{
	return copy_to_user(to, from, size);
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 27 100.00% 2 100.00%
Total 27 100.00% 2 100.00%



int copy_from_user_proc(void *to, void __user *from, int size)
{
	return copy_from_user(to, from, size);
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 27 100.00% 2 100.00%
Total 27 100.00% 2 100.00%



int clear_user_proc(void __user *buf, int size)
{
	return clear_user(buf, size);
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 21 100.00% 2 100.00%
Total 21 100.00% 2 100.00%



int cpu(void)
{
	return current_thread_info()->cpu;
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 13 100.00% 2 100.00%
Total 13 100.00% 2 100.00%


static atomic_t using_sysemu = ATOMIC_INIT(0);

int sysemu_supported;



void set_using_sysemu(int value)
{
	if (value > sysemu_supported)
		return;
	atomic_set(&using_sysemu, value);
}

Contributors
Person Tokens Prop Commits CommitProp
Paolo 'Blaisorblade' Giarrusso 16 69.57% 1 50.00%
Jeff Dike 7 30.43% 1 50.00%
Total 23 100.00% 2 100.00%



int get_using_sysemu(void)
{
	return atomic_read(&using_sysemu);
}

Contributors
Person Tokens Prop Commits CommitProp
Paolo 'Blaisorblade' Giarrusso 14 100.00% 1 100.00%
Total 14 100.00% 1 100.00%



static int sysemu_proc_show(struct seq_file *m, void *v)
{
	seq_printf(m, "%d\n", get_using_sysemu());
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Paolo 'Blaisorblade' Giarrusso 18 64.29% 1 50.00%
Alexey Dobriyan 10 35.71% 1 50.00%
Total 28 100.00% 2 100.00%



static int sysemu_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, sysemu_proc_show, NULL);
}

Contributors
Person Tokens Prop Commits CommitProp
Alexey Dobriyan 22 84.62% 1 50.00%
Paolo 'Blaisorblade' Giarrusso 4 15.38% 1 50.00%
Total 26 100.00% 2 100.00%



static ssize_t sysemu_proc_write(struct file *file, const char __user *buf,
				 size_t count, loff_t *pos)
{
	char tmp[2];

	if (copy_from_user(tmp, buf, 1))
		return -EFAULT;

	if (tmp[0] >= '0' && tmp[0] <= '2')
		set_using_sysemu(tmp[0] - '0');
	/* We use the first char, but pretend to write everything */
	return count;
}

Contributors
Person Tokens Prop Commits CommitProp
Paolo 'Blaisorblade' Giarrusso 64 85.33% 1 20.00%
Jeff Dike 5 6.67% 2 40.00%
Alexey Dobriyan 5 6.67% 1 20.00%
Al Viro 1 1.33% 1 20.00%
Total 75 100.00% 5 100.00%


static const struct file_operations sysemu_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= sysemu_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.write		= sysemu_proc_write,
};



int __init make_proc_sysemu(void)
{
	struct proc_dir_entry *ent;
	if (!sysemu_supported)
		return 0;

	ent = proc_create("sysemu", 0600, NULL, &sysemu_proc_fops);

	if (ent == NULL)
	{
		printk(KERN_WARNING "Failed to register /proc/sysemu\n");
		return 0;
	}

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Paolo 'Blaisorblade' Giarrusso 49 89.09% 1 25.00%
Alexey Dobriyan 5 9.09% 2 50.00%
Christophe Lucas 1 1.82% 1 25.00%
Total 55 100.00% 4 100.00%


late_initcall(make_proc_sysemu);



int singlestepping(void * t)
{
	struct task_struct *task = t ? t : current;

	if (!(task->ptrace & PT_DTRACE))
		return 0;

	if (task->thread.singlestep_syscall)
		return 1;

	return 2;
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 48 100.00% 3 100.00%
Total 48 100.00% 3 100.00%

/*
 * Only x86 and x86_64 have an arch_align_stack().
 * All other arches have "#define arch_align_stack(x) (x)"
 * in their asm/exec.h
 * As this is included in UML from asm-um/system-generic.h,
 * we can use it to behave as the subarch does.
 */
#ifndef arch_align_stack


unsigned long arch_align_stack(unsigned long sp)
{
	if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
		sp -= get_random_int() % 8192;
	return sp & ~0xf;
}
Contributors
Person Tokens Prop Commits CommitProp
Arjan van de Ven 27 75.00% 1 50.00%
Jeff Dike 9 25.00% 1 50.00%
Total 36 100.00% 2 100.00%

#endif



unsigned long get_wchan(struct task_struct *p)
{
	unsigned long stack_page, sp, ip;
	bool seen_sched = 0;

	if ((p == NULL) || (p == current) || (p->state == TASK_RUNNING))
		return 0;

	stack_page = (unsigned long) task_stack_page(p);
	/* Bail if the process has no kernel stack for some reason */
	if (stack_page == 0)
		return 0;

	sp = p->thread.switch_buf->JB_SP;
	/*
         * Bail if the stack pointer is below the bottom of the kernel
         * stack for some reason
         */
	if (sp < stack_page)
		return 0;

	while (sp < stack_page + THREAD_SIZE) {
		ip = *((unsigned long *) sp);
		if (in_sched_functions(ip))
			/* Ignore everything until we're above the scheduler */
			seen_sched = 1;
		else if (kernel_text_address(ip) && seen_sched)
			return ip;

		sp += sizeof(unsigned long);
	}

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 148 100.00% 1 100.00%
Total 148 100.00% 1 100.00%



int elf_core_copy_fpregs(struct task_struct *t, elf_fpregset_t *fpu)
{
	int cpu = current_thread_info()->cpu;

	return save_i387_registers(userspace_pid[cpu], (unsigned long *) fpu);
}

Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 37 97.37% 1 50.00%
Eli Cooper 1 2.63% 1 50.00%
Total 38 100.00% 2 100.00%

Overall Contributors
Person Tokens Prop Commits CommitProp
Jeff Dike 1122 68.96% 25 38.46%
Paolo 'Blaisorblade' Giarrusso 233 14.32% 5 7.69%
Alexey Dobriyan 86 5.29% 2 3.08%
Al Viro 79 4.86% 14 21.54%
Arjan van de Ven 29 1.78% 1 1.54%
Ingo Molnar 24 1.48% 4 6.15%
Ingo van Lil 10 0.61% 1 1.54%
Thomas Meyer 10 0.61% 1 1.54%
Richard Weinberger 9 0.55% 2 3.08%
Anton Ivanov 6 0.37% 1 1.54%
Bodo Stroesser 5 0.31% 1 1.54%
Robert Love 4 0.25% 1 1.54%
Tejun Heo 3 0.18% 1 1.54%
Karol Swietlicki 2 0.12% 1 1.54%
Linus Torvalds 1 0.06% 1 1.54%
David Howells 1 0.06% 1 1.54%
Américo Wang 1 0.06% 1 1.54%
Eli Cooper 1 0.06% 1 1.54%
Christophe Lucas 1 0.06% 1 1.54%
Total 1627 100.00% 65 100.00%
Directory: arch/um/kernel

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Jeff Dike	15	93.75%	3	75.00%
Karol Swietlicki	1	6.25%	1	25.00%
Total	16	100.00%	4	100.00%
cregit-Linux how code gets into the kernel

Release 4.14 arch/um/kernel/process.c

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