1 /*
2  * Copyright (C) 2008 The Android Open Source Project
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *  * Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  *  * Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in
12  *    the documentation and/or other materials provided with the
13  *    distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28 
29 #ifndef _LINKER_DEBUG_H_
30 #define _LINKER_DEBUG_H_
31 
32 // You can increase the verbosity of debug traces by defining the LD_DEBUG
33 // environment variable to a numeric value from 0 to 2 (corresponding to
34 // INFO, TRACE, and DEBUG calls in the source). This will only
35 // affect new processes being launched.
36 
37 // By default, traces are sent to logcat, with the "linker" tag. You can
38 // change this to go to stdout instead by setting the definition of
39 // LINKER_DEBUG_TO_LOG to 0.
40 #define LINKER_DEBUG_TO_LOG  1
41 
42 #define TRACE_DEBUG          1
43 #define DO_TRACE_LOOKUP      1
44 #define DO_TRACE_RELO        1
45 #define DO_TRACE_IFUNC       1
46 #define TIMING               0
47 #define STATS                0
48 #define COUNT_PAGES          0
49 
50 /*********************************************************************
51  * You shouldn't need to modify anything below unless you are adding
52  * more debugging information.
53  *
54  * To enable/disable specific debug options, change the defines above
55  *********************************************************************/
56 
57 #include "private/libc_logging.h"
58 
59 __LIBC_HIDDEN__ extern int g_ld_debug_verbosity;
60 
61 #if LINKER_DEBUG_TO_LOG
62 #define _PRINTVF(v, x...) \
63     do { \
64       if (g_ld_debug_verbosity > (v)) __libc_format_log(5-(v), "linker", x); \
65     } while (0)
66 #else /* !LINKER_DEBUG_TO_LOG */
67 #define _PRINTVF(v, x...) \
68     do { \
69       if (g_ld_debug_verbosity > (v)) { __libc_format_fd(1, x); write(1, "\n", 1); } \
70     } while (0)
71 #endif /* !LINKER_DEBUG_TO_LOG */
72 
73 #define PRINT(x...)          _PRINTVF(-1, x)
74 #define INFO(x...)           _PRINTVF(0, x)
75 #define TRACE(x...)          _PRINTVF(1, x)
76 
77 #if TRACE_DEBUG
78 #define DEBUG(x...)          _PRINTVF(2, "DEBUG: " x)
79 #else /* !TRACE_DEBUG */
80 #define DEBUG(x...)          do {} while (0)
81 #endif /* TRACE_DEBUG */
82 
83 #define TRACE_TYPE(t, x...)   do { if (DO_TRACE_##t) { TRACE(x); } } while (0)
84 
85 #if COUNT_PAGES
86 extern uint32_t bitmask[];
87 #if defined(__LP64__)
88 #define MARK(offset) \
89     do { \
90       if ((((offset) >> 12) >> 5) < 4096) \
91           bitmask[((offset) >> 12) >> 5] |= (1 << (((offset) >> 12) & 31)); \
92     } while (0)
93 #else
94 #define MARK(offset) \
95     do { \
96       bitmask[((offset) >> 12) >> 3] |= (1 << (((offset) >> 12) & 7)); \
97     } while (0)
98 #endif
99 #else
100 #define MARK(x) do {} while (0)
101 
102 #endif
103 
104 #endif /* _LINKER_DEBUG_H_ */
105