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