1 /*
2 * Debug information support.
3 *
4 * SPDX-License-Identifier: GPL-2.0-or-later
5 */
6
7 #include "qemu/osdep.h"
8 #include "qemu/lockable.h"
9 #include "tcg/debuginfo.h"
10
11 #include <elfutils/libdwfl.h>
12
13 static QemuMutex lock;
14 static Dwfl *dwfl;
15 static const Dwfl_Callbacks dwfl_callbacks = {
16 .find_elf = NULL,
17 .find_debuginfo = dwfl_standard_find_debuginfo,
18 .section_address = NULL,
19 .debuginfo_path = NULL,
20 };
21
22 __attribute__((constructor))
debuginfo_init(void)23 static void debuginfo_init(void)
24 {
25 qemu_mutex_init(&lock);
26 }
27
debuginfo_report_elf(const char * name,int fd,uint64_t bias)28 void debuginfo_report_elf(const char *name, int fd, uint64_t bias)
29 {
30 QEMU_LOCK_GUARD(&lock);
31
32 if (dwfl) {
33 dwfl_report_begin_add(dwfl);
34 } else {
35 dwfl = dwfl_begin(&dwfl_callbacks);
36 }
37
38 if (dwfl) {
39 dwfl_report_elf(dwfl, name, name, fd, bias, true);
40 dwfl_report_end(dwfl, NULL, NULL);
41 }
42 }
43
debuginfo_lock(void)44 void debuginfo_lock(void)
45 {
46 qemu_mutex_lock(&lock);
47 }
48
debuginfo_query(struct debuginfo_query * q,size_t n)49 void debuginfo_query(struct debuginfo_query *q, size_t n)
50 {
51 const char *symbol, *file;
52 Dwfl_Module *dwfl_module;
53 Dwfl_Line *dwfl_line;
54 GElf_Off dwfl_offset;
55 GElf_Sym dwfl_sym;
56 size_t i;
57 int line;
58
59 if (!dwfl) {
60 return;
61 }
62
63 for (i = 0; i < n; i++) {
64 dwfl_module = dwfl_addrmodule(dwfl, q[i].address);
65 if (!dwfl_module) {
66 continue;
67 }
68
69 if (q[i].flags & DEBUGINFO_SYMBOL) {
70 symbol = dwfl_module_addrinfo(dwfl_module, q[i].address,
71 &dwfl_offset, &dwfl_sym,
72 NULL, NULL, NULL);
73 if (symbol) {
74 q[i].symbol = symbol;
75 q[i].offset = dwfl_offset;
76 }
77 }
78
79 if (q[i].flags & DEBUGINFO_LINE) {
80 dwfl_line = dwfl_module_getsrc(dwfl_module, q[i].address);
81 if (dwfl_line) {
82 file = dwfl_lineinfo(dwfl_line, NULL, &line, 0, NULL, NULL);
83 if (file) {
84 q[i].file = file;
85 q[i].line = line;
86 }
87 }
88 }
89 }
90 }
91
debuginfo_unlock(void)92 void debuginfo_unlock(void)
93 {
94 qemu_mutex_unlock(&lock);
95 }
96