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627fce14 JP |
1 | /* |
2 | * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version 2 | |
7 | * of the License, or (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #include <unistd.h> | |
19 | #include "orc.h" | |
20 | #include "warn.h" | |
21 | ||
22 | static const char *reg_name(unsigned int reg) | |
23 | { | |
24 | switch (reg) { | |
25 | case ORC_REG_PREV_SP: | |
26 | return "prevsp"; | |
27 | case ORC_REG_DX: | |
28 | return "dx"; | |
29 | case ORC_REG_DI: | |
30 | return "di"; | |
31 | case ORC_REG_BP: | |
32 | return "bp"; | |
33 | case ORC_REG_SP: | |
34 | return "sp"; | |
35 | case ORC_REG_R10: | |
36 | return "r10"; | |
37 | case ORC_REG_R13: | |
38 | return "r13"; | |
39 | case ORC_REG_BP_INDIRECT: | |
40 | return "bp(ind)"; | |
41 | case ORC_REG_SP_INDIRECT: | |
42 | return "sp(ind)"; | |
43 | default: | |
44 | return "?"; | |
45 | } | |
46 | } | |
47 | ||
48 | static const char *orc_type_name(unsigned int type) | |
49 | { | |
50 | switch (type) { | |
51 | case ORC_TYPE_CALL: | |
52 | return "call"; | |
53 | case ORC_TYPE_REGS: | |
54 | return "regs"; | |
55 | case ORC_TYPE_REGS_IRET: | |
56 | return "iret"; | |
57 | default: | |
58 | return "?"; | |
59 | } | |
60 | } | |
61 | ||
62 | static void print_reg(unsigned int reg, int offset) | |
63 | { | |
64 | if (reg == ORC_REG_BP_INDIRECT) | |
65 | printf("(bp%+d)", offset); | |
66 | else if (reg == ORC_REG_SP_INDIRECT) | |
67 | printf("(sp%+d)", offset); | |
68 | else if (reg == ORC_REG_UNDEFINED) | |
69 | printf("(und)"); | |
70 | else | |
71 | printf("%s%+d", reg_name(reg), offset); | |
72 | } | |
73 | ||
74 | int orc_dump(const char *_objname) | |
75 | { | |
76 | int fd, nr_entries, i, *orc_ip = NULL, orc_size = 0; | |
77 | struct orc_entry *orc = NULL; | |
78 | char *name; | |
14c47b54 MP |
79 | size_t nr_sections; |
80 | Elf64_Addr orc_ip_addr = 0; | |
627fce14 JP |
81 | size_t shstrtab_idx; |
82 | Elf *elf; | |
83 | Elf_Scn *scn; | |
84 | GElf_Shdr sh; | |
85 | GElf_Rela rela; | |
86 | GElf_Sym sym; | |
87 | Elf_Data *data, *symtab = NULL, *rela_orc_ip = NULL; | |
88 | ||
89 | ||
90 | objname = _objname; | |
91 | ||
92 | elf_version(EV_CURRENT); | |
93 | ||
94 | fd = open(objname, O_RDONLY); | |
95 | if (fd == -1) { | |
96 | perror("open"); | |
97 | return -1; | |
98 | } | |
99 | ||
100 | elf = elf_begin(fd, ELF_C_READ_MMAP, NULL); | |
101 | if (!elf) { | |
102 | WARN_ELF("elf_begin"); | |
103 | return -1; | |
104 | } | |
105 | ||
106 | if (elf_getshdrnum(elf, &nr_sections)) { | |
107 | WARN_ELF("elf_getshdrnum"); | |
108 | return -1; | |
109 | } | |
110 | ||
111 | if (elf_getshdrstrndx(elf, &shstrtab_idx)) { | |
112 | WARN_ELF("elf_getshdrstrndx"); | |
113 | return -1; | |
114 | } | |
115 | ||
116 | for (i = 0; i < nr_sections; i++) { | |
117 | scn = elf_getscn(elf, i); | |
118 | if (!scn) { | |
119 | WARN_ELF("elf_getscn"); | |
120 | return -1; | |
121 | } | |
122 | ||
123 | if (!gelf_getshdr(scn, &sh)) { | |
124 | WARN_ELF("gelf_getshdr"); | |
125 | return -1; | |
126 | } | |
127 | ||
128 | name = elf_strptr(elf, shstrtab_idx, sh.sh_name); | |
129 | if (!name) { | |
130 | WARN_ELF("elf_strptr"); | |
131 | return -1; | |
132 | } | |
133 | ||
134 | data = elf_getdata(scn, NULL); | |
135 | if (!data) { | |
136 | WARN_ELF("elf_getdata"); | |
137 | return -1; | |
138 | } | |
139 | ||
140 | if (!strcmp(name, ".symtab")) { | |
141 | symtab = data; | |
142 | } else if (!strcmp(name, ".orc_unwind")) { | |
143 | orc = data->d_buf; | |
144 | orc_size = sh.sh_size; | |
145 | } else if (!strcmp(name, ".orc_unwind_ip")) { | |
146 | orc_ip = data->d_buf; | |
147 | orc_ip_addr = sh.sh_addr; | |
148 | } else if (!strcmp(name, ".rela.orc_unwind_ip")) { | |
149 | rela_orc_ip = data; | |
150 | } | |
151 | } | |
152 | ||
153 | if (!symtab || !orc || !orc_ip) | |
154 | return 0; | |
155 | ||
156 | if (orc_size % sizeof(*orc) != 0) { | |
157 | WARN("bad .orc_unwind section size"); | |
158 | return -1; | |
159 | } | |
160 | ||
161 | nr_entries = orc_size / sizeof(*orc); | |
162 | for (i = 0; i < nr_entries; i++) { | |
163 | if (rela_orc_ip) { | |
164 | if (!gelf_getrela(rela_orc_ip, i, &rela)) { | |
165 | WARN_ELF("gelf_getrela"); | |
166 | return -1; | |
167 | } | |
168 | ||
169 | if (!gelf_getsym(symtab, GELF_R_SYM(rela.r_info), &sym)) { | |
170 | WARN_ELF("gelf_getsym"); | |
171 | return -1; | |
172 | } | |
173 | ||
174 | scn = elf_getscn(elf, sym.st_shndx); | |
175 | if (!scn) { | |
176 | WARN_ELF("elf_getscn"); | |
177 | return -1; | |
178 | } | |
179 | ||
180 | if (!gelf_getshdr(scn, &sh)) { | |
181 | WARN_ELF("gelf_getshdr"); | |
182 | return -1; | |
183 | } | |
184 | ||
185 | name = elf_strptr(elf, shstrtab_idx, sh.sh_name); | |
186 | if (!name || !*name) { | |
187 | WARN_ELF("elf_strptr"); | |
188 | return -1; | |
189 | } | |
190 | ||
14c47b54 | 191 | printf("%s+%llx:", name, (unsigned long long)rela.r_addend); |
627fce14 JP |
192 | |
193 | } else { | |
14c47b54 | 194 | printf("%llx:", (unsigned long long)(orc_ip_addr + (i * sizeof(int)) + orc_ip[i])); |
627fce14 JP |
195 | } |
196 | ||
197 | ||
198 | printf(" sp:"); | |
199 | ||
200 | print_reg(orc[i].sp_reg, orc[i].sp_offset); | |
201 | ||
202 | printf(" bp:"); | |
203 | ||
204 | print_reg(orc[i].bp_reg, orc[i].bp_offset); | |
205 | ||
206 | printf(" type:%s\n", orc_type_name(orc[i].type)); | |
207 | } | |
208 | ||
209 | elf_end(elf); | |
210 | close(fd); | |
211 | ||
212 | return 0; | |
213 | } |