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1ccea77e | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
627fce14 JP |
2 | /* |
3 | * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com> | |
627fce14 JP |
4 | */ |
5 | ||
6 | #include <unistd.h> | |
7 | #include "orc.h" | |
8 | #include "warn.h" | |
9 | ||
10 | static const char *reg_name(unsigned int reg) | |
11 | { | |
12 | switch (reg) { | |
13 | case ORC_REG_PREV_SP: | |
14 | return "prevsp"; | |
15 | case ORC_REG_DX: | |
16 | return "dx"; | |
17 | case ORC_REG_DI: | |
18 | return "di"; | |
19 | case ORC_REG_BP: | |
20 | return "bp"; | |
21 | case ORC_REG_SP: | |
22 | return "sp"; | |
23 | case ORC_REG_R10: | |
24 | return "r10"; | |
25 | case ORC_REG_R13: | |
26 | return "r13"; | |
27 | case ORC_REG_BP_INDIRECT: | |
28 | return "bp(ind)"; | |
29 | case ORC_REG_SP_INDIRECT: | |
30 | return "sp(ind)"; | |
31 | default: | |
32 | return "?"; | |
33 | } | |
34 | } | |
35 | ||
36 | static const char *orc_type_name(unsigned int type) | |
37 | { | |
38 | switch (type) { | |
39 | case ORC_TYPE_CALL: | |
40 | return "call"; | |
41 | case ORC_TYPE_REGS: | |
42 | return "regs"; | |
43 | case ORC_TYPE_REGS_IRET: | |
44 | return "iret"; | |
45 | default: | |
46 | return "?"; | |
47 | } | |
48 | } | |
49 | ||
50 | static void print_reg(unsigned int reg, int offset) | |
51 | { | |
52 | if (reg == ORC_REG_BP_INDIRECT) | |
53 | printf("(bp%+d)", offset); | |
54 | else if (reg == ORC_REG_SP_INDIRECT) | |
55 | printf("(sp%+d)", offset); | |
56 | else if (reg == ORC_REG_UNDEFINED) | |
57 | printf("(und)"); | |
58 | else | |
59 | printf("%s%+d", reg_name(reg), offset); | |
60 | } | |
61 | ||
62 | int orc_dump(const char *_objname) | |
63 | { | |
64 | int fd, nr_entries, i, *orc_ip = NULL, orc_size = 0; | |
65 | struct orc_entry *orc = NULL; | |
66 | char *name; | |
14c47b54 MP |
67 | size_t nr_sections; |
68 | Elf64_Addr orc_ip_addr = 0; | |
627fce14 JP |
69 | size_t shstrtab_idx; |
70 | Elf *elf; | |
71 | Elf_Scn *scn; | |
72 | GElf_Shdr sh; | |
73 | GElf_Rela rela; | |
74 | GElf_Sym sym; | |
75 | Elf_Data *data, *symtab = NULL, *rela_orc_ip = NULL; | |
76 | ||
77 | ||
78 | objname = _objname; | |
79 | ||
80 | elf_version(EV_CURRENT); | |
81 | ||
82 | fd = open(objname, O_RDONLY); | |
83 | if (fd == -1) { | |
84 | perror("open"); | |
85 | return -1; | |
86 | } | |
87 | ||
88 | elf = elf_begin(fd, ELF_C_READ_MMAP, NULL); | |
89 | if (!elf) { | |
90 | WARN_ELF("elf_begin"); | |
91 | return -1; | |
92 | } | |
93 | ||
94 | if (elf_getshdrnum(elf, &nr_sections)) { | |
95 | WARN_ELF("elf_getshdrnum"); | |
96 | return -1; | |
97 | } | |
98 | ||
99 | if (elf_getshdrstrndx(elf, &shstrtab_idx)) { | |
100 | WARN_ELF("elf_getshdrstrndx"); | |
101 | return -1; | |
102 | } | |
103 | ||
104 | for (i = 0; i < nr_sections; i++) { | |
105 | scn = elf_getscn(elf, i); | |
106 | if (!scn) { | |
107 | WARN_ELF("elf_getscn"); | |
108 | return -1; | |
109 | } | |
110 | ||
111 | if (!gelf_getshdr(scn, &sh)) { | |
112 | WARN_ELF("gelf_getshdr"); | |
113 | return -1; | |
114 | } | |
115 | ||
116 | name = elf_strptr(elf, shstrtab_idx, sh.sh_name); | |
117 | if (!name) { | |
118 | WARN_ELF("elf_strptr"); | |
119 | return -1; | |
120 | } | |
121 | ||
122 | data = elf_getdata(scn, NULL); | |
123 | if (!data) { | |
124 | WARN_ELF("elf_getdata"); | |
125 | return -1; | |
126 | } | |
127 | ||
128 | if (!strcmp(name, ".symtab")) { | |
129 | symtab = data; | |
130 | } else if (!strcmp(name, ".orc_unwind")) { | |
131 | orc = data->d_buf; | |
132 | orc_size = sh.sh_size; | |
133 | } else if (!strcmp(name, ".orc_unwind_ip")) { | |
134 | orc_ip = data->d_buf; | |
135 | orc_ip_addr = sh.sh_addr; | |
136 | } else if (!strcmp(name, ".rela.orc_unwind_ip")) { | |
137 | rela_orc_ip = data; | |
138 | } | |
139 | } | |
140 | ||
141 | if (!symtab || !orc || !orc_ip) | |
142 | return 0; | |
143 | ||
144 | if (orc_size % sizeof(*orc) != 0) { | |
145 | WARN("bad .orc_unwind section size"); | |
146 | return -1; | |
147 | } | |
148 | ||
149 | nr_entries = orc_size / sizeof(*orc); | |
150 | for (i = 0; i < nr_entries; i++) { | |
151 | if (rela_orc_ip) { | |
152 | if (!gelf_getrela(rela_orc_ip, i, &rela)) { | |
153 | WARN_ELF("gelf_getrela"); | |
154 | return -1; | |
155 | } | |
156 | ||
157 | if (!gelf_getsym(symtab, GELF_R_SYM(rela.r_info), &sym)) { | |
158 | WARN_ELF("gelf_getsym"); | |
159 | return -1; | |
160 | } | |
161 | ||
162 | scn = elf_getscn(elf, sym.st_shndx); | |
163 | if (!scn) { | |
164 | WARN_ELF("elf_getscn"); | |
165 | return -1; | |
166 | } | |
167 | ||
168 | if (!gelf_getshdr(scn, &sh)) { | |
169 | WARN_ELF("gelf_getshdr"); | |
170 | return -1; | |
171 | } | |
172 | ||
173 | name = elf_strptr(elf, shstrtab_idx, sh.sh_name); | |
174 | if (!name || !*name) { | |
175 | WARN_ELF("elf_strptr"); | |
176 | return -1; | |
177 | } | |
178 | ||
14c47b54 | 179 | printf("%s+%llx:", name, (unsigned long long)rela.r_addend); |
627fce14 JP |
180 | |
181 | } else { | |
14c47b54 | 182 | printf("%llx:", (unsigned long long)(orc_ip_addr + (i * sizeof(int)) + orc_ip[i])); |
627fce14 JP |
183 | } |
184 | ||
185 | ||
186 | printf(" sp:"); | |
187 | ||
188 | print_reg(orc[i].sp_reg, orc[i].sp_offset); | |
189 | ||
190 | printf(" bp:"); | |
191 | ||
192 | print_reg(orc[i].bp_reg, orc[i].bp_offset); | |
193 | ||
d31a5802 JP |
194 | printf(" type:%s end:%d\n", |
195 | orc_type_name(orc[i].type), orc[i].end); | |
627fce14 JP |
196 | } |
197 | ||
198 | elf_end(elf); | |
199 | close(fd); | |
200 | ||
201 | return 0; | |
202 | } |