debug_worker/gdb/targets/
breakpoints.rs

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
// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.

use super::TargetArch;
use super::VmTarget;
use crate::gdb::VmProxy;
use gdbstub::target;
use gdbstub::target::TargetError;
use gdbstub::target::TargetResult;
use gdbstub::target::ext::breakpoints::WatchKind;
use vmm_core_defs::debug_rpc::BreakpointSize;
use vmm_core_defs::debug_rpc::BreakpointType;
use vmm_core_defs::debug_rpc::HardwareBreakpoint;

impl<T: TargetArch> target::ext::breakpoints::Breakpoints for VmTarget<'_, T> {
    #[inline(always)]
    fn support_sw_breakpoint(
        &mut self,
    ) -> Option<target::ext::breakpoints::SwBreakpointOps<'_, Self>> {
        None
    }

    #[inline(always)]
    fn support_hw_breakpoint(
        &mut self,
    ) -> Option<target::ext::breakpoints::HwBreakpointOps<'_, Self>> {
        Some(self)
    }

    #[inline(always)]
    fn support_hw_watchpoint(
        &mut self,
    ) -> Option<target::ext::breakpoints::HwWatchpointOps<'_, Self>> {
        Some(self)
    }
}

impl<T: TargetArch> target::ext::breakpoints::SwBreakpoint for VmTarget<'_, T> {
    fn add_sw_breakpoint(&mut self, addr: T::Usize, instr_len: usize) -> TargetResult<bool, Self> {
        tracing::error!(
            "setting sw breakpoint at {:#018x?} with len {}",
            addr.into(),
            instr_len
        );

        tracing::error!("sw breakpoints are not implemented!");
        Err(TargetError::NonFatal)
    }

    fn remove_sw_breakpoint(
        &mut self,
        addr: T::Usize,
        instr_len: usize,
    ) -> TargetResult<bool, Self> {
        tracing::error!(
            "removing sw breakpoint at {:#018x?} with len {}",
            addr.into(),
            instr_len
        );

        tracing::error!("sw breakpoints are not implemented!");
        Err(TargetError::NonFatal)
    }
}

impl VmProxy {
    fn add_breakpoint(&mut self, bp: HardwareBreakpoint) -> bool {
        if let Some(slot) = self.breakpoints.iter_mut().find(|x| x.is_none()) {
            *slot = Some(bp);
            true
        } else {
            false
        }
    }

    fn remove_breakpoint(&mut self, bp: HardwareBreakpoint) -> bool {
        if let Some(slot) = self
            .breakpoints
            .iter_mut()
            .find(|x| x.as_ref() == Some(&bp))
        {
            *slot = None;
            true
        } else {
            false
        }
    }
}

impl<T: TargetArch> target::ext::breakpoints::HwBreakpoint for VmTarget<'_, T> {
    fn add_hw_breakpoint(
        &mut self,
        addr: T::Usize,
        _kind: T::BreakpointKind,
    ) -> TargetResult<bool, Self> {
        Ok(self.add_breakpoint(HardwareBreakpoint {
            address: addr.into(),
            ty: BreakpointType::Execute,
            size: BreakpointSize::Byte,
        }))
    }

    fn remove_hw_breakpoint(
        &mut self,
        addr: T::Usize,
        _kind: T::BreakpointKind,
    ) -> TargetResult<bool, Self> {
        Ok(self.remove_breakpoint(HardwareBreakpoint {
            address: addr.into(),
            ty: BreakpointType::Execute,
            size: BreakpointSize::Byte,
        }))
    }
}

impl<T: TargetArch> target::ext::breakpoints::HwWatchpoint for VmTarget<'_, T> {
    fn add_hw_watchpoint(
        &mut self,
        addr: T::Usize,
        len: T::Usize,
        kind: WatchKind,
    ) -> TargetResult<bool, Self> {
        Ok(self.add_breakpoint(HardwareBreakpoint {
            address: addr.into(),
            ty: type_from_watch_kind(kind),
            size: (len.into() as usize)
                .try_into()
                .map_err(|_| TargetError::NonFatal)?,
        }))
    }

    fn remove_hw_watchpoint(
        &mut self,
        addr: T::Usize,
        len: T::Usize,
        kind: WatchKind,
    ) -> TargetResult<bool, Self> {
        Ok(self.remove_breakpoint(HardwareBreakpoint {
            address: addr.into(),
            ty: type_from_watch_kind(kind),
            size: (len.into() as usize)
                .try_into()
                .map_err(|_| TargetError::NonFatal)?,
        }))
    }
}

fn type_from_watch_kind(kind: WatchKind) -> BreakpointType {
    match kind {
        WatchKind::Write => BreakpointType::Write,
        WatchKind::Read | WatchKind::ReadWrite => BreakpointType::ReadOrWrite,
    }
}