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
|
/*
* Copyright (c) 2021, Patrick Meyer <git@the-space.agency>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Assertions.h>
#include <AK/NonnullOwnPtr.h>
#include <Kernel/Devices/KCOVDevice.h>
#include <Kernel/Devices/KCOVInstance.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <LibC/sys/ioctl_numbers.h>
#include <Kernel/Panic.h>
namespace Kernel {
HashMap<ProcessID, KCOVInstance*>* KCOVDevice::proc_instance;
HashMap<ThreadID, KCOVInstance*>* KCOVDevice::thread_instance;
UNMAP_AFTER_INIT NonnullRefPtr<KCOVDevice> KCOVDevice::must_create()
{
return adopt_ref(*new KCOVDevice);
}
UNMAP_AFTER_INIT KCOVDevice::KCOVDevice()
: BlockDevice(30, 0)
{
proc_instance = new HashMap<ProcessID, KCOVInstance*>();
thread_instance = new HashMap<ThreadID, KCOVInstance*>();
dbgln("KCOVDevice created");
}
void KCOVDevice::free_thread()
{
auto thread = Thread::current();
auto tid = thread->tid();
auto maybe_kcov_instance = thread_instance->get(tid);
if (!maybe_kcov_instance.has_value())
return;
auto kcov_instance = maybe_kcov_instance.value();
VERIFY(kcov_instance->state() == KCOVInstance::TRACING);
kcov_instance->set_state(KCOVInstance::OPENED);
thread_instance->remove(tid);
}
void KCOVDevice::free_process()
{
auto pid = Process::current().pid();
auto maybe_kcov_instance = proc_instance->get(pid);
if (!maybe_kcov_instance.has_value())
return;
auto kcov_instance = maybe_kcov_instance.value();
VERIFY(kcov_instance->state() == KCOVInstance::OPENED);
kcov_instance->set_state(KCOVInstance::UNUSED);
proc_instance->remove(pid);
delete kcov_instance;
}
KResultOr<NonnullRefPtr<FileDescription>> KCOVDevice::open(int options)
{
auto pid = Process::current().pid();
if (proc_instance->get(pid).has_value())
return EBUSY; // This process already open()ed the kcov device
auto kcov_instance = new KCOVInstance(pid);
kcov_instance->set_state(KCOVInstance::OPENED);
proc_instance->set(pid, kcov_instance);
return File::open(options);
}
KResult KCOVDevice::ioctl(FileDescription&, unsigned request, Userspace<void*> arg)
{
KResult return_value = KSuccess;
auto thread = Thread::current();
auto tid = thread->tid();
auto pid = thread->pid();
auto maybe_kcov_instance = proc_instance->get(pid);
if (!maybe_kcov_instance.has_value())
return ENXIO; // This proc hasn't opened the kcov dev yet
auto kcov_instance = maybe_kcov_instance.value();
SpinlockLocker locker(kcov_instance->spinlock());
switch (request) {
case KCOV_SETBUFSIZE: {
if (kcov_instance->state() >= KCOVInstance::TRACING) {
return_value = EBUSY;
break;
}
return_value = kcov_instance->buffer_allocate((FlatPtr)arg.unsafe_userspace_ptr());
break;
}
case KCOV_ENABLE: {
if (kcov_instance->state() >= KCOVInstance::TRACING) {
return_value = EBUSY;
break;
}
if (!kcov_instance->has_buffer()) {
return_value = ENOBUFS;
break;
}
VERIFY(kcov_instance->state() == KCOVInstance::OPENED);
kcov_instance->set_state(KCOVInstance::TRACING);
thread_instance->set(tid, kcov_instance);
break;
}
case KCOV_DISABLE: {
auto maybe_kcov_instance = thread_instance->get(tid);
if (!maybe_kcov_instance.has_value()) {
return_value = ENOENT;
break;
}
VERIFY(kcov_instance->state() == KCOVInstance::TRACING);
kcov_instance->set_state(KCOVInstance::OPENED);
thread_instance->remove(tid);
break;
}
default: {
return_value = EINVAL;
}
};
return return_value;
}
KResultOr<Memory::Region*> KCOVDevice::mmap(Process& process, FileDescription&, Memory::VirtualRange const& range, u64 offset, int prot, bool shared)
{
auto pid = process.pid();
auto maybe_kcov_instance = proc_instance->get(pid);
VERIFY(maybe_kcov_instance.has_value()); // Should happen on fd open()
auto kcov_instance = maybe_kcov_instance.value();
if (!kcov_instance->vmobject())
return ENOBUFS; // mmaped, before KCOV_SETBUFSIZE
return process.address_space().allocate_region_with_vmobject(
range, *kcov_instance->vmobject(), offset, {}, prot, shared);
}
String KCOVDevice::device_name() const
{
return "kcov"sv;
}
}
|
