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8d4e028f LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2014 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
20 | #include <dwarf.h> | |
21 | #include <elfutils/libdwfl.h> | |
22 | ||
b5efdb8a | 23 | #include "alloc-util.h" |
3ffd4af2 | 24 | #include "fd-util.h" |
07630cea | 25 | #include "formats-util.h" |
8d4e028f | 26 | #include "macro.h" |
3ffd4af2 | 27 | #include "stacktrace.h" |
07630cea LP |
28 | #include "string-util.h" |
29 | #include "util.h" | |
8d4e028f LP |
30 | |
31 | #define FRAMES_MAX 64 | |
32 | #define THREADS_MAX 64 | |
33 | ||
34 | struct stack_context { | |
35 | FILE *f; | |
36 | Dwfl *dwfl; | |
37 | Elf *elf; | |
38 | unsigned n_thread; | |
39 | unsigned n_frame; | |
40 | }; | |
41 | ||
42 | static int frame_callback(Dwfl_Frame *frame, void *userdata) { | |
43 | struct stack_context *c = userdata; | |
44 | Dwarf_Addr pc, pc_adjusted, bias = 0; | |
45 | _cleanup_free_ Dwarf_Die *scopes = NULL; | |
46 | const char *fname = NULL, *symbol = NULL; | |
47 | Dwfl_Module *module; | |
48 | bool is_activation; | |
49 | ||
50 | assert(frame); | |
51 | assert(c); | |
52 | ||
53 | if (c->n_frame >= FRAMES_MAX) | |
54 | return DWARF_CB_ABORT; | |
55 | ||
56 | if (!dwfl_frame_pc(frame, &pc, &is_activation)) | |
57 | return DWARF_CB_ABORT; | |
58 | ||
59 | pc_adjusted = pc - (is_activation ? 0 : 1); | |
60 | ||
61 | module = dwfl_addrmodule(c->dwfl, pc_adjusted); | |
62 | if (module) { | |
63 | Dwarf_Die *s, *cudie; | |
64 | int n; | |
65 | ||
66 | cudie = dwfl_module_addrdie(module, pc_adjusted, &bias); | |
67 | if (cudie) { | |
68 | n = dwarf_getscopes(cudie, pc_adjusted - bias, &scopes); | |
69 | for (s = scopes; s < scopes + n; s++) { | |
70 | if (IN_SET(dwarf_tag(s), DW_TAG_subprogram, DW_TAG_inlined_subroutine, DW_TAG_entry_point)) { | |
71 | Dwarf_Attribute *a, space; | |
72 | ||
73 | a = dwarf_attr_integrate(s, DW_AT_MIPS_linkage_name, &space); | |
74 | if (!a) | |
75 | a = dwarf_attr_integrate(s, DW_AT_linkage_name, &space); | |
76 | if (a) | |
77 | symbol = dwarf_formstring(a); | |
78 | if (!symbol) | |
79 | symbol = dwarf_diename(s); | |
80 | ||
81 | if (symbol) | |
82 | break; | |
83 | } | |
84 | } | |
85 | } | |
86 | ||
87 | if (!symbol) | |
88 | symbol = dwfl_module_addrname(module, pc_adjusted); | |
89 | ||
90 | fname = dwfl_module_info(module, NULL, NULL, NULL, NULL, NULL, NULL, NULL); | |
91 | } | |
92 | ||
93 | fprintf(c->f, "#%-2u 0x%016" PRIx64 " %s (%s)\n", c->n_frame, (uint64_t) pc, strna(symbol), strna(fname)); | |
94 | c->n_frame ++; | |
95 | ||
96 | return DWARF_CB_OK; | |
97 | } | |
98 | ||
99 | static int thread_callback(Dwfl_Thread *thread, void *userdata) { | |
100 | struct stack_context *c = userdata; | |
101 | pid_t tid; | |
102 | ||
103 | assert(thread); | |
104 | assert(c); | |
105 | ||
106 | if (c->n_thread >= THREADS_MAX) | |
107 | return DWARF_CB_ABORT; | |
108 | ||
109 | if (c->n_thread != 0) | |
110 | fputc('\n', c->f); | |
111 | ||
112 | c->n_frame = 0; | |
113 | ||
114 | tid = dwfl_thread_tid(thread); | |
115 | fprintf(c->f, "Stack trace of thread " PID_FMT ":\n", tid); | |
116 | ||
117 | if (dwfl_thread_getframes(thread, frame_callback, c) < 0) | |
118 | return DWARF_CB_ABORT; | |
119 | ||
120 | c->n_thread ++; | |
121 | ||
122 | return DWARF_CB_OK; | |
123 | } | |
124 | ||
125 | int coredump_make_stack_trace(int fd, const char *executable, char **ret) { | |
126 | ||
127 | static const Dwfl_Callbacks callbacks = { | |
128 | .find_elf = dwfl_build_id_find_elf, | |
129 | .find_debuginfo = dwfl_standard_find_debuginfo, | |
130 | }; | |
131 | ||
132 | struct stack_context c = {}; | |
133 | char *buf = NULL; | |
134 | size_t sz = 0; | |
135 | int r; | |
136 | ||
137 | assert(fd >= 0); | |
138 | assert(ret); | |
139 | ||
140 | if (lseek(fd, 0, SEEK_SET) == (off_t) -1) | |
141 | return -errno; | |
142 | ||
143 | c.f = open_memstream(&buf, &sz); | |
144 | if (!c.f) | |
145 | return -ENOMEM; | |
146 | ||
147 | elf_version(EV_CURRENT); | |
148 | ||
149 | c.elf = elf_begin(fd, ELF_C_READ_MMAP, NULL); | |
150 | if (!c.elf) { | |
151 | r = -EINVAL; | |
152 | goto finish; | |
153 | } | |
154 | ||
155 | c.dwfl = dwfl_begin(&callbacks); | |
156 | if (!c.dwfl) { | |
157 | r = -EINVAL; | |
158 | goto finish; | |
159 | } | |
160 | ||
161 | if (dwfl_core_file_report(c.dwfl, c.elf, executable) < 0) { | |
162 | r = -EINVAL; | |
163 | goto finish; | |
164 | } | |
165 | ||
166 | if (dwfl_report_end(c.dwfl, NULL, NULL) != 0) { | |
167 | r = -EINVAL; | |
168 | goto finish; | |
169 | } | |
170 | ||
171 | if (dwfl_core_file_attach(c.dwfl, c.elf) < 0) { | |
172 | r = -EINVAL; | |
173 | goto finish; | |
174 | } | |
175 | ||
176 | if (dwfl_getthreads(c.dwfl, thread_callback, &c) < 0) { | |
177 | r = -EINVAL; | |
178 | goto finish; | |
179 | } | |
180 | ||
74ca738f | 181 | c.f = safe_fclose(c.f); |
8d4e028f LP |
182 | |
183 | *ret = buf; | |
184 | buf = NULL; | |
185 | ||
186 | r = 0; | |
187 | ||
188 | finish: | |
189 | if (c.dwfl) | |
190 | dwfl_end(c.dwfl); | |
191 | ||
192 | if (c.elf) | |
193 | elf_end(c.elf); | |
194 | ||
74ca738f | 195 | safe_fclose(c.f); |
8d4e028f LP |
196 | |
197 | free(buf); | |
198 | ||
199 | return r; | |
200 | } |