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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/*
* OpenRISC ptrace.c
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* Modifications for the OpenRISC architecture:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2005 Gyorgy Jeney <nog@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/audit.h>
#include <linux/regset.h>
#include <linux/tracehook.h>
#include <linux/elf.h>
#include <asm/thread_info.h>
#include <asm/segment.h>
#include <asm/page.h>
#include <asm/pgtable.h>
/*
* Copy the thread state to a regset that can be interpreted by userspace.
*
* It doesn't matter what our internal pt_regs structure looks like. The
* important thing is that we export a consistent view of the thread state
* to userspace. As such, we need to make sure that the regset remains
* ABI compatible as defined by the struct user_regs_struct:
*
* (Each item is a 32-bit word)
* r0 = 0 (exported for clarity)
* 31 GPRS r1-r31
* PC (Program counter)
* SR (Supervision register)
*/
static int genregs_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user * ubuf)
{
const struct pt_regs *regs = task_pt_regs(target);
int ret;
/* r0 */
ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, 0, 4);
if (!ret)
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
regs->gpr+1, 4, 4*32);
if (!ret)
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
®s->pc, 4*32, 4*33);
if (!ret)
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
®s->sr, 4*33, 4*34);
if (!ret)
ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
4*34, -1);
return ret;
}
/*
* Set the thread state from a regset passed in via ptrace
*/
static int genregs_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user * ubuf)
{
struct pt_regs *regs = task_pt_regs(target);
int ret;
/* ignore r0 */
ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, 4);
/* r1 - r31 */
if (!ret)
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
regs->gpr+1, 4, 4*32);
/* PC */
if (!ret)
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
®s->pc, 4*32, 4*33);
/*
* Skip SR and padding... userspace isn't allowed to changes bits in
* the Supervision register
*/
if (!ret)
ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
4*33, -1);
return ret;
}
/*
* Define the register sets available on OpenRISC under Linux
*/
enum or1k_regset {
REGSET_GENERAL,
};
static const struct user_regset or1k_regsets[] = {
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS,
.n = ELF_NGREG,
.size = sizeof(long),
.align = sizeof(long),
.get = genregs_get,
.set = genregs_set,
},
};
static const struct user_regset_view user_or1k_native_view = {
.name = "or1k",
.e_machine = EM_OPENRISC,
.regsets = or1k_regsets,
.n = ARRAY_SIZE(or1k_regsets),
};
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
return &user_or1k_native_view;
}
/*
* does not yet catch signals sent when the child dies.
* in exit.c or in signal.c.
*/
/*
* Called by kernel/ptrace.c when detaching..
*
* Make sure the single step bit is not set.
*/
void ptrace_disable(struct task_struct *child)
{
pr_debug("ptrace_disable(): TODO\n");
user_disable_single_step(child);
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
}
long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
unsigned long data)
{
int ret;
switch (request) {
default:
ret = ptrace_request(child, request, addr, data);
break;
}
return ret;
}
/*
* Notification of system call entry/exit
* - triggered by current->work.syscall_trace
*/
asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
{
long ret = 0;
if (test_thread_flag(TIF_SYSCALL_TRACE) &&
tracehook_report_syscall_entry(regs))
/*
* Tracing decided this syscall should not happen.
* We'll return a bogus call number to get an ENOSYS
* error, but leave the original number in <something>.
*/
ret = -1L;
audit_syscall_entry(regs->gpr[11], regs->gpr[3], regs->gpr[4],
regs->gpr[5], regs->gpr[6]);
return ret ? : regs->gpr[11];
}
asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
{
int step;
audit_syscall_exit(regs);
step = test_thread_flag(TIF_SINGLESTEP);
if (step || test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall_exit(regs, step);
}
|
