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
#![allow(dead_code, deprecated)]
use io::prelude::*;
use dynamic_lib::DynamicLibrary;
use io;
use libc::c_void;
use mem;
use path::Path;
use ptr;
use sync::StaticMutex;
use sys::c;
macro_rules! sym{ ($lib:expr, $e:expr, $t:ident) => (unsafe {
let lib = $lib;
match lib.symbol($e) {
Ok(f) => $crate::mem::transmute::<*mut u8, $t>(f),
Err(..) => return Ok(())
}
}) }
#[cfg(target_env = "msvc")]
#[path = "printing/msvc.rs"]
mod printing;
#[cfg(target_env = "gnu")]
#[path = "printing/gnu.rs"]
mod printing;
type SymFromAddrFn =
extern "system" fn(c::HANDLE, u64, *mut u64,
*mut c::SYMBOL_INFO) -> c::BOOL;
type SymGetLineFromAddr64Fn =
extern "system" fn(c::HANDLE, u64, *mut u32,
*mut c::IMAGEHLP_LINE64) -> c::BOOL;
type SymInitializeFn =
extern "system" fn(c::HANDLE, *mut c_void,
c::BOOL) -> c::BOOL;
type SymCleanupFn =
extern "system" fn(c::HANDLE) -> c::BOOL;
type StackWalk64Fn =
extern "system" fn(c::DWORD, c::HANDLE, c::HANDLE,
*mut c::STACKFRAME64, *mut c::CONTEXT,
*mut c_void, *mut c_void,
*mut c_void, *mut c_void) -> c::BOOL;
#[cfg(target_arch = "x86")]
pub fn init_frame(frame: &mut c::STACKFRAME64,
ctx: &c::CONTEXT) -> c::DWORD {
frame.AddrPC.Offset = ctx.Eip as u64;
frame.AddrPC.Mode = c::ADDRESS_MODE::AddrModeFlat;
frame.AddrStack.Offset = ctx.Esp as u64;
frame.AddrStack.Mode = c::ADDRESS_MODE::AddrModeFlat;
frame.AddrFrame.Offset = ctx.Ebp as u64;
frame.AddrFrame.Mode = c::ADDRESS_MODE::AddrModeFlat;
c::IMAGE_FILE_MACHINE_I386
}
#[cfg(target_arch = "x86_64")]
pub fn init_frame(frame: &mut c::STACKFRAME64,
ctx: &c::CONTEXT) -> c::DWORD {
frame.AddrPC.Offset = ctx.Rip as u64;
frame.AddrPC.Mode = c::ADDRESS_MODE::AddrModeFlat;
frame.AddrStack.Offset = ctx.Rsp as u64;
frame.AddrStack.Mode = c::ADDRESS_MODE::AddrModeFlat;
frame.AddrFrame.Offset = ctx.Rbp as u64;
frame.AddrFrame.Mode = c::ADDRESS_MODE::AddrModeFlat;
c::IMAGE_FILE_MACHINE_AMD64
}
struct Cleanup {
handle: c::HANDLE,
SymCleanup: SymCleanupFn,
}
impl Drop for Cleanup {
fn drop(&mut self) { (self.SymCleanup)(self.handle); }
}
pub fn write(w: &mut Write) -> io::Result<()> {
static LOCK: StaticMutex = StaticMutex::new();
let _g = LOCK.lock();
let path = Path::new("dbghelp.dll");
let dbghelp = match DynamicLibrary::open(Some(&path)) {
Ok(lib) => lib,
Err(..) => return Ok(()),
};
let SymInitialize = sym!(&dbghelp, "SymInitialize", SymInitializeFn);
let SymCleanup = sym!(&dbghelp, "SymCleanup", SymCleanupFn);
let StackWalk64 = sym!(&dbghelp, "StackWalk64", StackWalk64Fn);
let process = unsafe { c::GetCurrentProcess() };
let thread = unsafe { c::GetCurrentThread() };
let mut context: c::CONTEXT = unsafe { mem::zeroed() };
unsafe { c::RtlCaptureContext(&mut context); }
let mut frame: c::STACKFRAME64 = unsafe { mem::zeroed() };
let image = init_frame(&mut frame, &context);
let ret = SymInitialize(process, ptr::null_mut(), c::TRUE);
if ret != c::TRUE { return Ok(()) }
let _c = Cleanup { handle: process, SymCleanup: SymCleanup };
let mut i = -1;
try!(write!(w, "stack backtrace:\n"));
while StackWalk64(image, process, thread, &mut frame, &mut context,
ptr::null_mut(),
ptr::null_mut(),
ptr::null_mut(),
ptr::null_mut()) == c::TRUE {
let addr = frame.AddrPC.Offset;
if addr == frame.AddrReturn.Offset || addr == 0 ||
frame.AddrReturn.Offset == 0 { break }
i += 1;
if i >= 0 {
try!(printing::print(w, i, addr-1, &dbghelp, process));
}
}
Ok(())
}