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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
4 */
5
6#include <unistd.h>
7#include <asm/orc_types.h>
8#include <objtool/objtool.h>
9#include <objtool/warn.h>
10#include <objtool/endianness.h>
11
12static const char *reg_name(unsigned int reg)
13{
14 switch (reg) {
15 case ORC_REG_PREV_SP:
16 return "prevsp";
17 case ORC_REG_DX:
18 return "dx";
19 case ORC_REG_DI:
20 return "di";
21 case ORC_REG_BP:
22 return "bp";
23 case ORC_REG_SP:
24 return "sp";
25 case ORC_REG_R10:
26 return "r10";
27 case ORC_REG_R13:
28 return "r13";
29 case ORC_REG_BP_INDIRECT:
30 return "bp(ind)";
31 case ORC_REG_SP_INDIRECT:
32 return "sp(ind)";
33 default:
34 return "?";
35 }
36}
37
38static const char *orc_type_name(unsigned int type)
39{
40 switch (type) {
41 case ORC_TYPE_UNDEFINED:
42 return "(und)";
43 case ORC_TYPE_END_OF_STACK:
44 return "end";
45 case ORC_TYPE_CALL:
46 return "call";
47 case ORC_TYPE_REGS:
48 return "regs";
49 case ORC_TYPE_REGS_PARTIAL:
50 return "regs (partial)";
51 default:
52 return "?";
53 }
54}
55
56static void print_reg(unsigned int reg, int offset)
57{
58 if (reg == ORC_REG_BP_INDIRECT)
59 printf("(bp%+d)", offset);
60 else if (reg == ORC_REG_SP_INDIRECT)
61 printf("(sp)%+d", offset);
62 else if (reg == ORC_REG_UNDEFINED)
63 printf("(und)");
64 else
65 printf("%s%+d", reg_name(reg), offset);
66}
67
68int orc_dump(const char *_objname)
69{
70 int fd, nr_entries, i, *orc_ip = NULL, orc_size = 0;
71 struct orc_entry *orc = NULL;
72 char *name;
73 size_t nr_sections;
74 Elf64_Addr orc_ip_addr = 0;
75 size_t shstrtab_idx, strtab_idx = 0;
76 Elf *elf;
77 Elf_Scn *scn;
78 GElf_Shdr sh;
79 GElf_Rela rela;
80 GElf_Sym sym;
81 Elf_Data *data, *symtab = NULL, *rela_orc_ip = NULL;
82 struct elf dummy_elf = {};
83
84
85 objname = _objname;
86
87 elf_version(EV_CURRENT);
88
89 fd = open(objname, O_RDONLY);
90 if (fd == -1) {
91 perror("open");
92 return -1;
93 }
94
95 elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
96 if (!elf) {
97 WARN_ELF("elf_begin");
98 return -1;
99 }
100
101 if (!elf64_getehdr(elf)) {
102 WARN_ELF("elf64_getehdr");
103 return -1;
104 }
105 memcpy(&dummy_elf.ehdr, elf64_getehdr(elf), sizeof(dummy_elf.ehdr));
106
107 if (elf_getshdrnum(elf, &nr_sections)) {
108 WARN_ELF("elf_getshdrnum");
109 return -1;
110 }
111
112 if (elf_getshdrstrndx(elf, &shstrtab_idx)) {
113 WARN_ELF("elf_getshdrstrndx");
114 return -1;
115 }
116
117 for (i = 0; i < nr_sections; i++) {
118 scn = elf_getscn(elf, i);
119 if (!scn) {
120 WARN_ELF("elf_getscn");
121 return -1;
122 }
123
124 if (!gelf_getshdr(scn, &sh)) {
125 WARN_ELF("gelf_getshdr");
126 return -1;
127 }
128
129 name = elf_strptr(elf, shstrtab_idx, sh.sh_name);
130 if (!name) {
131 WARN_ELF("elf_strptr");
132 return -1;
133 }
134
135 data = elf_getdata(scn, NULL);
136 if (!data) {
137 WARN_ELF("elf_getdata");
138 return -1;
139 }
140
141 if (!strcmp(name, ".symtab")) {
142 symtab = data;
143 } else if (!strcmp(name, ".strtab")) {
144 strtab_idx = i;
145 } else if (!strcmp(name, ".orc_unwind")) {
146 orc = data->d_buf;
147 orc_size = sh.sh_size;
148 } else if (!strcmp(name, ".orc_unwind_ip")) {
149 orc_ip = data->d_buf;
150 orc_ip_addr = sh.sh_addr;
151 } else if (!strcmp(name, ".rela.orc_unwind_ip")) {
152 rela_orc_ip = data;
153 }
154 }
155
156 if (!symtab || !strtab_idx || !orc || !orc_ip)
157 return 0;
158
159 if (orc_size % sizeof(*orc) != 0) {
160 WARN("bad .orc_unwind section size");
161 return -1;
162 }
163
164 nr_entries = orc_size / sizeof(*orc);
165 for (i = 0; i < nr_entries; i++) {
166 if (rela_orc_ip) {
167 if (!gelf_getrela(rela_orc_ip, i, &rela)) {
168 WARN_ELF("gelf_getrela");
169 return -1;
170 }
171
172 if (!gelf_getsym(symtab, GELF_R_SYM(rela.r_info), &sym)) {
173 WARN_ELF("gelf_getsym");
174 return -1;
175 }
176
177 if (GELF_ST_TYPE(sym.st_info) == STT_SECTION) {
178 scn = elf_getscn(elf, sym.st_shndx);
179 if (!scn) {
180 WARN_ELF("elf_getscn");
181 return -1;
182 }
183
184 if (!gelf_getshdr(scn, &sh)) {
185 WARN_ELF("gelf_getshdr");
186 return -1;
187 }
188
189 name = elf_strptr(elf, shstrtab_idx, sh.sh_name);
190 if (!name) {
191 WARN_ELF("elf_strptr");
192 return -1;
193 }
194 } else {
195 name = elf_strptr(elf, strtab_idx, sym.st_name);
196 if (!name) {
197 WARN_ELF("elf_strptr");
198 return -1;
199 }
200 }
201
202 printf("%s+%llx:", name, (unsigned long long)rela.r_addend);
203
204 } else {
205 printf("%llx:", (unsigned long long)(orc_ip_addr + (i * sizeof(int)) + orc_ip[i]));
206 }
207
208 printf("type:%s", orc_type_name(orc[i].type));
209
210 printf(" sp:");
211
212 print_reg(orc[i].sp_reg, bswap_if_needed(&dummy_elf, orc[i].sp_offset));
213
214 printf(" bp:");
215
216 print_reg(orc[i].bp_reg, bswap_if_needed(&dummy_elf, orc[i].bp_offset));
217
218 printf(" signal:%d\n", orc[i].signal);
219 }
220
221 elf_end(elf);
222 close(fd);
223
224 return 0;
225}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
4 */
5
6#include <unistd.h>
7#include <asm/orc_types.h>
8#include <objtool/objtool.h>
9#include <objtool/orc.h>
10#include <objtool/warn.h>
11#include <objtool/endianness.h>
12
13int orc_dump(const char *_objname)
14{
15 int fd, nr_entries, i, *orc_ip = NULL, orc_size = 0;
16 struct orc_entry *orc = NULL;
17 char *name;
18 size_t nr_sections;
19 Elf64_Addr orc_ip_addr = 0;
20 size_t shstrtab_idx, strtab_idx = 0;
21 Elf *elf;
22 Elf_Scn *scn;
23 GElf_Shdr sh;
24 GElf_Rela rela;
25 GElf_Sym sym;
26 Elf_Data *data, *symtab = NULL, *rela_orc_ip = NULL;
27 struct elf dummy_elf = {};
28
29
30 objname = _objname;
31
32 elf_version(EV_CURRENT);
33
34 fd = open(objname, O_RDONLY);
35 if (fd == -1) {
36 perror("open");
37 return -1;
38 }
39
40 elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
41 if (!elf) {
42 WARN_ELF("elf_begin");
43 return -1;
44 }
45
46 if (!elf64_getehdr(elf)) {
47 WARN_ELF("elf64_getehdr");
48 return -1;
49 }
50 memcpy(&dummy_elf.ehdr, elf64_getehdr(elf), sizeof(dummy_elf.ehdr));
51
52 if (elf_getshdrnum(elf, &nr_sections)) {
53 WARN_ELF("elf_getshdrnum");
54 return -1;
55 }
56
57 if (elf_getshdrstrndx(elf, &shstrtab_idx)) {
58 WARN_ELF("elf_getshdrstrndx");
59 return -1;
60 }
61
62 for (i = 0; i < nr_sections; i++) {
63 scn = elf_getscn(elf, i);
64 if (!scn) {
65 WARN_ELF("elf_getscn");
66 return -1;
67 }
68
69 if (!gelf_getshdr(scn, &sh)) {
70 WARN_ELF("gelf_getshdr");
71 return -1;
72 }
73
74 name = elf_strptr(elf, shstrtab_idx, sh.sh_name);
75 if (!name) {
76 WARN_ELF("elf_strptr");
77 return -1;
78 }
79
80 data = elf_getdata(scn, NULL);
81 if (!data) {
82 WARN_ELF("elf_getdata");
83 return -1;
84 }
85
86 if (!strcmp(name, ".symtab")) {
87 symtab = data;
88 } else if (!strcmp(name, ".strtab")) {
89 strtab_idx = i;
90 } else if (!strcmp(name, ".orc_unwind")) {
91 orc = data->d_buf;
92 orc_size = sh.sh_size;
93 } else if (!strcmp(name, ".orc_unwind_ip")) {
94 orc_ip = data->d_buf;
95 orc_ip_addr = sh.sh_addr;
96 } else if (!strcmp(name, ".rela.orc_unwind_ip")) {
97 rela_orc_ip = data;
98 }
99 }
100
101 if (!symtab || !strtab_idx || !orc || !orc_ip)
102 return 0;
103
104 if (orc_size % sizeof(*orc) != 0) {
105 WARN("bad .orc_unwind section size");
106 return -1;
107 }
108
109 nr_entries = orc_size / sizeof(*orc);
110 for (i = 0; i < nr_entries; i++) {
111 if (rela_orc_ip) {
112 if (!gelf_getrela(rela_orc_ip, i, &rela)) {
113 WARN_ELF("gelf_getrela");
114 return -1;
115 }
116
117 if (!gelf_getsym(symtab, GELF_R_SYM(rela.r_info), &sym)) {
118 WARN_ELF("gelf_getsym");
119 return -1;
120 }
121
122 if (GELF_ST_TYPE(sym.st_info) == STT_SECTION) {
123 scn = elf_getscn(elf, sym.st_shndx);
124 if (!scn) {
125 WARN_ELF("elf_getscn");
126 return -1;
127 }
128
129 if (!gelf_getshdr(scn, &sh)) {
130 WARN_ELF("gelf_getshdr");
131 return -1;
132 }
133
134 name = elf_strptr(elf, shstrtab_idx, sh.sh_name);
135 if (!name) {
136 WARN_ELF("elf_strptr");
137 return -1;
138 }
139 } else {
140 name = elf_strptr(elf, strtab_idx, sym.st_name);
141 if (!name) {
142 WARN_ELF("elf_strptr");
143 return -1;
144 }
145 }
146
147 printf("%s+%llx:", name, (unsigned long long)rela.r_addend);
148
149 } else {
150 printf("%llx:", (unsigned long long)(orc_ip_addr + (i * sizeof(int)) + orc_ip[i]));
151 }
152
153 orc_print_dump(&dummy_elf, orc, i);
154 }
155
156 elf_end(elf);
157 close(fd);
158
159 return 0;
160}