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18#include <unistd.h>
19#include "orc.h"
20#include "warn.h"
21
22static 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
48static 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
62static 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
74int 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;
79 size_t nr_sections;
80 Elf64_Addr orc_ip_addr = 0;
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
191 printf("%s+%llx:", name, (unsigned long long)rela.r_addend);
192
193 } else {
194 printf("%llx:", (unsigned long long)(orc_ip_addr + (i * sizeof(int)) + orc_ip[i]));
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 end:%d\n",
207 orc_type_name(orc[i].type), orc[i].end);
208 }
209
210 elf_end(elf);
211 close(fd);
212
213 return 0;
214}
215
