Contributors: 29
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Jeff Dike |
1051 |
65.20% |
33 |
32.67% |
| Paolo 'Blaisorblade' Giarrusso |
254 |
15.76% |
10 |
9.90% |
| Alexey Dobriyan |
78 |
4.84% |
3 |
2.97% |
| Al Viro |
48 |
2.98% |
15 |
14.85% |
| Eric W. Biedermann |
40 |
2.48% |
4 |
3.96% |
| Johannes Berg |
30 |
1.86% |
4 |
3.96% |
| Arjan van de Ven |
26 |
1.61% |
1 |
0.99% |
| Ingo Molnar |
18 |
1.12% |
4 |
3.96% |
| Bodo Stroesser |
11 |
0.68% |
2 |
1.98% |
| Thomas Meyer |
10 |
0.62% |
1 |
0.99% |
| Richard Weinberger |
6 |
0.37% |
2 |
1.98% |
| Jens Axboe |
6 |
0.37% |
2 |
1.98% |
| Linus Torvalds (pre-git) |
5 |
0.31% |
2 |
1.98% |
| Amanieu d'Antras |
5 |
0.31% |
1 |
0.99% |
| Jason A. Donenfeld |
3 |
0.19% |
2 |
1.98% |
| Karol Swietlicki |
2 |
0.12% |
1 |
0.99% |
| Anton Ivanov |
2 |
0.12% |
1 |
0.99% |
| Alex Dewar |
2 |
0.12% |
1 |
0.99% |
| Robert Love |
2 |
0.12% |
1 |
0.99% |
| Ingo van Lil |
2 |
0.12% |
1 |
0.99% |
| Gennady Sharapov |
2 |
0.12% |
1 |
0.99% |
| Linus Torvalds |
2 |
0.12% |
2 |
1.98% |
| Christophe Lucas |
1 |
0.06% |
1 |
0.99% |
| Peter Zijlstra |
1 |
0.06% |
1 |
0.99% |
| Eli Cooper |
1 |
0.06% |
1 |
0.99% |
| Christian Brauner |
1 |
0.06% |
1 |
0.99% |
| Américo Wang |
1 |
0.06% |
1 |
0.99% |
| David Howells |
1 |
0.06% |
1 |
0.99% |
| Kees Cook |
1 |
0.06% |
1 |
0.99% |
| Total |
1612 |
|
101 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* 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.
*/
#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/resume_user_mode.h>
#include <asm/current.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 <registers.h>
#include <linux/time-internal.h>
#include <linux/elfcore.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];
}
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;
}
void free_stack(unsigned long stack, int order)
{
free_pages(stack, order);
}
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;
}
static inline void set_current(struct task_struct *task)
{
cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task)
{ external_pid(), task });
}
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;
}
void interrupt_end(void)
{
struct pt_regs *regs = ¤t->thread.regs;
if (need_resched())
schedule();
if (test_thread_flag(TIF_SIGPENDING) ||
test_thread_flag(TIF_NOTIFY_SIGNAL))
do_signal(regs);
if (test_thread_flag(TIF_NOTIFY_RESUME))
resume_user_mode_work(regs);
}
int get_current_pid(void)
{
return task_pid_nr(current);
}
/*
* 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(¤t->thread.regs.regs, current_thread_info()->aux_fp_regs);
}
/* 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(¤t->thread.regs.regs, current_thread_info()->aux_fp_regs);
}
int copy_thread(struct task_struct * p, const struct kernel_clone_args *args)
{
unsigned long clone_flags = args->flags;
unsigned long sp = args->stack;
unsigned long tls = args->tls;
void (*handler)(void);
int ret = 0;
p->thread = (struct thread_struct) INIT_THREAD;
if (!args->fn) {
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(¤t->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 = args->fn;
p->thread.request.u.thread.arg = args->fn_arg;
handler = new_thread_handler;
}
new_thread(task_stack_page(p), &p->thread.switch_buf, handler);
if (!args->fn) {
clear_flushed_tls(p);
/*
* Set a new TLS for the child thread?
*/
if (clone_flags & CLONE_SETTLS)
ret = arch_set_tls(p, tls);
}
return ret;
}
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;
}
void um_idle_sleep(void)
{
if (time_travel_mode != TT_MODE_OFF)
time_travel_sleep();
else
os_idle_sleep();
}
void arch_cpu_idle(void)
{
cpu_tasks[current_thread_info()->cpu].pid = os_getpid();
um_idle_sleep();
raw_local_irq_enable();
}
int __cant_sleep(void) {
return in_atomic() || irqs_disabled() || in_interrupt();
/* Is in_interrupt() really needed? */
}
int user_context(unsigned long sp)
{
unsigned long stack;
stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);
return stack != (unsigned long) current_thread_info();
}
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)();
}
char *uml_strdup(const char *string)
{
return kstrdup(string, GFP_KERNEL);
}
EXPORT_SYMBOL(uml_strdup);
int copy_to_user_proc(void __user *to, void *from, int size)
{
return copy_to_user(to, from, size);
}
int copy_from_user_proc(void *to, void __user *from, int size)
{
return copy_from_user(to, from, size);
}
int clear_user_proc(void __user *buf, int size)
{
return clear_user(buf, size);
}
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);
}
int get_using_sysemu(void)
{
return atomic_read(&using_sysemu);
}
static int sysemu_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "%d\n", get_using_sysemu());
return 0;
}
static int sysemu_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, sysemu_proc_show, NULL);
}
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;
}
static const struct proc_ops sysemu_proc_ops = {
.proc_open = sysemu_proc_open,
.proc_read = seq_read,
.proc_lseek = seq_lseek,
.proc_release = single_release,
.proc_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_ops);
if (ent == NULL)
{
printk(KERN_WARNING "Failed to register /proc/sysemu\n");
return 0;
}
return 0;
}
late_initcall(make_proc_sysemu);
int singlestepping(void * t)
{
struct task_struct *task = t ? t : current;
if (!test_thread_flag(TIF_SINGLESTEP))
return 0;
if (task->thread.singlestep_syscall)
return 1;
return 2;
}
/*
* 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_u32_below(8192);
return sp & ~0xf;
}
#endif
unsigned long __get_wchan(struct task_struct *p)
{
unsigned long stack_page, sp, ip;
bool seen_sched = 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;
}
int elf_core_copy_task_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);
}