1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
// SPDX-License-Identifier: GPL-2.0
/*
* linux/arch/h8300/kernel/process.c
*
* Yoshinori Sato <ysato@users.sourceforge.jp>
*
* Based on:
*
* linux/arch/m68knommu/kernel/process.c
*
* Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
* Kenneth Albanowski <kjahds@kjahds.com>,
* The Silver Hammer Group, Ltd.
*
* linux/arch/m68k/kernel/process.c
*
* Copyright (C) 1995 Hamish Macdonald
*
* 68060 fixes by Jesper Skov
*/
/*
* This file handles the architecture-dependent parts of process handling..
*/
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/sched/task.h>
#include <linux/sched/task_stack.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/interrupt.h>
#include <linux/reboot.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/rcupdate.h>
#include <linux/uaccess.h>
#include <asm/traps.h>
#include <asm/setup.h>
void (*pm_power_off)(void) = NULL;
EXPORT_SYMBOL(pm_power_off);
asmlinkage void ret_from_fork(void);
asmlinkage void ret_from_kernel_thread(void);
/*
* The idle loop on an H8/300..
*/
void arch_cpu_idle(void)
{
raw_local_irq_enable();
__asm__("sleep");
}
void machine_restart(char *__unused)
{
local_irq_disable();
__asm__("jmp @@0");
}
void machine_halt(void)
{
local_irq_disable();
__asm__("sleep");
for (;;)
;
}
void machine_power_off(void)
{
local_irq_disable();
__asm__("sleep");
for (;;)
;
}
void show_regs(struct pt_regs *regs)
{
show_regs_print_info(KERN_DEFAULT);
pr_notice("\n");
pr_notice("PC: %08lx Status: %02x\n",
regs->pc, regs->ccr);
pr_notice("ORIG_ER0: %08lx ER0: %08lx ER1: %08lx\n",
regs->orig_er0, regs->er0, regs->er1);
pr_notice("ER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx\n",
regs->er2, regs->er3, regs->er4, regs->er5);
pr_notice("ER6' %08lx ", regs->er6);
if (user_mode(regs))
printk("USP: %08lx\n", rdusp());
else
printk("\n");
}
void flush_thread(void)
{
}
int copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long topstk, struct task_struct *p, unsigned long tls)
{
struct pt_regs *childregs;
childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) {
memset(childregs, 0, sizeof(struct pt_regs));
childregs->retpc = (unsigned long) ret_from_kernel_thread;
childregs->er4 = topstk; /* arg */
childregs->er5 = usp; /* fn */
} else {
*childregs = *current_pt_regs();
childregs->er0 = 0;
childregs->retpc = (unsigned long) ret_from_fork;
p->thread.usp = usp ?: rdusp();
}
p->thread.ksp = (unsigned long)childregs;
return 0;
}
unsigned long get_wchan(struct task_struct *p)
{
unsigned long fp, pc;
unsigned long stack_page;
int count = 0;
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
stack_page = (unsigned long)p;
fp = ((struct pt_regs *)p->thread.ksp)->er6;
do {
if (fp < stack_page+sizeof(struct thread_info) ||
fp >= 8184+stack_page)
return 0;
pc = ((unsigned long *)fp)[1];
if (!in_sched_functions(pc))
return pc;
fp = *(unsigned long *) fp;
} while (count++ < 16);
return 0;
}
/* generic sys_clone is not enough registers */
asmlinkage int sys_clone(unsigned long __user *args)
{
unsigned long clone_flags;
unsigned long newsp;
uintptr_t parent_tidptr;
uintptr_t child_tidptr;
struct kernel_clone_args kargs = {};
get_user(clone_flags, &args[0]);
get_user(newsp, &args[1]);
get_user(parent_tidptr, &args[2]);
get_user(child_tidptr, &args[3]);
kargs.flags = (lower_32_bits(clone_flags) & ~CSIGNAL);
kargs.pidfd = (int __user *)parent_tidptr;
kargs.child_tid = (int __user *)child_tidptr;
kargs.parent_tid = (int __user *)parent_tidptr;
kargs.exit_signal = (lower_32_bits(clone_flags) & CSIGNAL);
kargs.stack = newsp;
return kernel_clone(&kargs);
}
|
