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
|
/*
* 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/API/Ioctl.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/Devices/KCOVDevice.h>
#include <Kernel/Devices/KCOVInstance.h>
#include <Kernel/FileSystem/OpenFileDescription.h>
#include <Kernel/Panic.h>
namespace Kernel {
HashMap<ProcessID, KCOVInstance*>* KCOVDevice::proc_instance;
HashMap<ThreadID, KCOVInstance*>* KCOVDevice::thread_instance;
UNMAP_AFTER_INIT NonnullLockRefPtr<KCOVDevice> KCOVDevice::must_create()
{
auto kcov_device_or_error = DeviceManagement::try_create_device<KCOVDevice>();
// FIXME: Find a way to propagate errors
VERIFY(!kcov_device_or_error.is_error());
return kcov_device_or_error.release_value();
}
UNMAP_AFTER_INIT KCOVDevice::KCOVDevice()
: CharacterDevice(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;
}
ErrorOr<NonnullRefPtr<OpenFileDescription>> 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 Device::open(options);
}
ErrorOr<void> KCOVDevice::ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg)
{
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 EBUSY;
return kcov_instance->buffer_allocate((FlatPtr)arg.unsafe_userspace_ptr());
case KCOV_ENABLE:
if (kcov_instance->state() >= KCOVInstance::TRACING)
return EBUSY;
if (!kcov_instance->has_buffer())
return ENOBUFS;
VERIFY(kcov_instance->state() == KCOVInstance::OPENED);
kcov_instance->set_state(KCOVInstance::TRACING);
thread_instance->set(tid, kcov_instance);
return {};
case KCOV_DISABLE: {
auto maybe_kcov_instance = thread_instance->get(tid);
if (!maybe_kcov_instance.has_value())
return ENOENT;
VERIFY(kcov_instance->state() == KCOVInstance::TRACING);
kcov_instance->set_state(KCOVInstance::OPENED);
thread_instance->remove(tid);
return {};
}
default:
return EINVAL;
}
}
ErrorOr<NonnullLockRefPtr<Memory::VMObject>> KCOVDevice::vmobject_for_mmap(Process& process, Memory::VirtualRange const&, u64&, bool)
{
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 *kcov_instance->vmobject();
}
}
|
