Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 2 | #include <fcntl.h> |
| 3 | #include <stdio.h> |
| 4 | #include <errno.h> |
Arnaldo Carvalho de Melo | 215a0d3 | 2019-07-04 11:21:24 -0300 | [diff] [blame] | 5 | #include <stdlib.h> |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 6 | #include <string.h> |
| 7 | #include <unistd.h> |
| 8 | #include <inttypes.h> |
| 9 | |
Arnaldo Carvalho de Melo | 09aa3b0 | 2019-09-10 16:17:19 +0100 | [diff] [blame] | 10 | #include "dso.h" |
Arnaldo Carvalho de Melo | 1101f69 | 2019-01-27 13:42:37 +0100 | [diff] [blame] | 11 | #include "map.h" |
Arnaldo Carvalho de Melo | c54d241 | 2019-11-25 22:24:10 -0300 | [diff] [blame] | 12 | #include "maps.h" |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 13 | #include "symbol.h" |
Arnaldo Carvalho de Melo | b1d1b09 | 2019-08-30 10:26:37 -0300 | [diff] [blame] | 14 | #include "symsrc.h" |
Stephane Eranian | e9c4bcd | 2015-11-30 10:02:20 +0100 | [diff] [blame] | 15 | #include "demangle-java.h" |
David Tolnay | cae15db | 2016-07-09 00:20:00 -0700 | [diff] [blame] | 16 | #include "demangle-rust.h" |
Waiman Long | 8fa7d87 | 2014-09-29 16:07:28 -0400 | [diff] [blame] | 17 | #include "machine.h" |
Vladimir Nikulichev | 922d0e4 | 2014-04-17 08:27:01 -0700 | [diff] [blame] | 18 | #include "vdso.h" |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 19 | #include "debug.h" |
Arnaldo Carvalho de Melo | 32ff3fe | 2019-09-24 15:14:12 -0300 | [diff] [blame] | 20 | #include "util/copyfile.h" |
Arnaldo Carvalho de Melo | 3052ba5 | 2019-06-25 17:27:31 -0300 | [diff] [blame] | 21 | #include <linux/ctype.h> |
Arnaldo Carvalho de Melo | fb71c86c | 2019-09-03 10:56:06 -0300 | [diff] [blame] | 22 | #include <linux/kernel.h> |
Arnaldo Carvalho de Melo | 7f7c536 | 2019-07-04 11:32:27 -0300 | [diff] [blame] | 23 | #include <linux/zalloc.h> |
Arnaldo Carvalho de Melo | 3d689ed | 2017-04-17 16:10:49 -0300 | [diff] [blame] | 24 | #include <symbol/kallsyms.h> |
Arnaldo Carvalho de Melo | fb71c86c | 2019-09-03 10:56:06 -0300 | [diff] [blame] | 25 | #include <internal/lib.h> |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 26 | |
David Ahern | e370a3d | 2015-02-18 19:33:37 -0500 | [diff] [blame] | 27 | #ifndef EM_AARCH64 |
| 28 | #define EM_AARCH64 183 /* ARM 64 bit */ |
| 29 | #endif |
| 30 | |
Arnaldo Carvalho de Melo | 843cf70 | 2019-02-04 15:48:03 -0300 | [diff] [blame] | 31 | #ifndef ELF32_ST_VISIBILITY |
| 32 | #define ELF32_ST_VISIBILITY(o) ((o) & 0x03) |
| 33 | #endif |
| 34 | |
| 35 | /* For ELF64 the definitions are the same. */ |
| 36 | #ifndef ELF64_ST_VISIBILITY |
| 37 | #define ELF64_ST_VISIBILITY(o) ELF32_ST_VISIBILITY (o) |
| 38 | #endif |
| 39 | |
| 40 | /* How to extract information held in the st_other field. */ |
| 41 | #ifndef GELF_ST_VISIBILITY |
| 42 | #define GELF_ST_VISIBILITY(val) ELF64_ST_VISIBILITY (val) |
| 43 | #endif |
| 44 | |
Arnaldo Carvalho de Melo | cc31078 | 2016-07-12 11:04:13 -0300 | [diff] [blame] | 45 | typedef Elf64_Nhdr GElf_Nhdr; |
David Ahern | e370a3d | 2015-02-18 19:33:37 -0500 | [diff] [blame] | 46 | |
Arnaldo Carvalho de Melo | 9bea81b | 2019-08-30 10:01:50 -0300 | [diff] [blame] | 47 | #ifndef DMGL_PARAMS |
| 48 | #define DMGL_NO_OPTS 0 /* For readability... */ |
| 49 | #define DMGL_PARAMS (1 << 0) /* Include function args */ |
| 50 | #define DMGL_ANSI (1 << 1) /* Include const, volatile, etc */ |
| 51 | #endif |
| 52 | |
Remi Bernon | ba0509d | 2020-08-21 18:52:36 +0200 | [diff] [blame] | 53 | #ifdef HAVE_LIBBFD_SUPPORT |
| 54 | #define PACKAGE 'perf' |
| 55 | #include <bfd.h> |
| 56 | #else |
Arnaldo Carvalho de Melo | aaba4e1 | 2014-11-24 17:10:52 -0300 | [diff] [blame] | 57 | #ifdef HAVE_CPLUS_DEMANGLE_SUPPORT |
| 58 | extern char *cplus_demangle(const char *, int); |
| 59 | |
| 60 | static inline char *bfd_demangle(void __maybe_unused *v, const char *c, int i) |
| 61 | { |
| 62 | return cplus_demangle(c, i); |
| 63 | } |
| 64 | #else |
| 65 | #ifdef NO_DEMANGLE |
| 66 | static inline char *bfd_demangle(void __maybe_unused *v, |
| 67 | const char __maybe_unused *c, |
| 68 | int __maybe_unused i) |
| 69 | { |
| 70 | return NULL; |
| 71 | } |
Remi Bernon | ba0509d | 2020-08-21 18:52:36 +0200 | [diff] [blame] | 72 | #endif |
Arnaldo Carvalho de Melo | aaba4e1 | 2014-11-24 17:10:52 -0300 | [diff] [blame] | 73 | #endif |
| 74 | #endif |
| 75 | |
Ingo Molnar | 89fe808 | 2013-09-30 12:07:11 +0200 | [diff] [blame] | 76 | #ifndef HAVE_ELF_GETPHDRNUM_SUPPORT |
Arnaldo Carvalho de Melo | 179f36d | 2015-09-17 11:30:20 -0300 | [diff] [blame] | 77 | static int elf_getphdrnum(Elf *elf, size_t *dst) |
Adrian Hunter | e955d5c | 2013-09-13 16:49:30 +0300 | [diff] [blame] | 78 | { |
| 79 | GElf_Ehdr gehdr; |
| 80 | GElf_Ehdr *ehdr; |
| 81 | |
| 82 | ehdr = gelf_getehdr(elf, &gehdr); |
| 83 | if (!ehdr) |
| 84 | return -1; |
| 85 | |
| 86 | *dst = ehdr->e_phnum; |
| 87 | |
| 88 | return 0; |
| 89 | } |
| 90 | #endif |
| 91 | |
Arnaldo Carvalho de Melo | 2492c46 | 2016-07-04 19:35:47 -0300 | [diff] [blame] | 92 | #ifndef HAVE_ELF_GETSHDRSTRNDX_SUPPORT |
| 93 | static int elf_getshdrstrndx(Elf *elf __maybe_unused, size_t *dst __maybe_unused) |
| 94 | { |
| 95 | pr_err("%s: update your libelf to > 0.140, this one lacks elf_getshdrstrndx().\n", __func__); |
| 96 | return -1; |
| 97 | } |
| 98 | #endif |
| 99 | |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 100 | #ifndef NT_GNU_BUILD_ID |
| 101 | #define NT_GNU_BUILD_ID 3 |
| 102 | #endif |
| 103 | |
| 104 | /** |
| 105 | * elf_symtab__for_each_symbol - iterate thru all the symbols |
| 106 | * |
| 107 | * @syms: struct elf_symtab instance to iterate |
| 108 | * @idx: uint32_t idx |
| 109 | * @sym: GElf_Sym iterator |
| 110 | */ |
| 111 | #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \ |
| 112 | for (idx = 0, gelf_getsym(syms, idx, &sym);\ |
| 113 | idx < nr_syms; \ |
| 114 | idx++, gelf_getsym(syms, idx, &sym)) |
| 115 | |
| 116 | static inline uint8_t elf_sym__type(const GElf_Sym *sym) |
| 117 | { |
| 118 | return GELF_ST_TYPE(sym->st_info); |
| 119 | } |
| 120 | |
Jiri Olsa | 59a1770 | 2019-01-28 14:35:26 +0100 | [diff] [blame] | 121 | static inline uint8_t elf_sym__visibility(const GElf_Sym *sym) |
| 122 | { |
| 123 | return GELF_ST_VISIBILITY(sym->st_other); |
| 124 | } |
| 125 | |
Vinson Lee | 4e31050 | 2015-02-09 16:29:37 -0800 | [diff] [blame] | 126 | #ifndef STT_GNU_IFUNC |
| 127 | #define STT_GNU_IFUNC 10 |
| 128 | #endif |
| 129 | |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 130 | static inline int elf_sym__is_function(const GElf_Sym *sym) |
| 131 | { |
Adrian Hunter | a2f3b6b | 2014-07-14 13:02:33 +0300 | [diff] [blame] | 132 | return (elf_sym__type(sym) == STT_FUNC || |
| 133 | elf_sym__type(sym) == STT_GNU_IFUNC) && |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 134 | sym->st_name != 0 && |
| 135 | sym->st_shndx != SHN_UNDEF; |
| 136 | } |
| 137 | |
| 138 | static inline bool elf_sym__is_object(const GElf_Sym *sym) |
| 139 | { |
| 140 | return elf_sym__type(sym) == STT_OBJECT && |
| 141 | sym->st_name != 0 && |
| 142 | sym->st_shndx != SHN_UNDEF; |
| 143 | } |
| 144 | |
| 145 | static inline int elf_sym__is_label(const GElf_Sym *sym) |
| 146 | { |
| 147 | return elf_sym__type(sym) == STT_NOTYPE && |
| 148 | sym->st_name != 0 && |
| 149 | sym->st_shndx != SHN_UNDEF && |
Jiri Olsa | 59a1770 | 2019-01-28 14:35:26 +0100 | [diff] [blame] | 150 | sym->st_shndx != SHN_ABS && |
| 151 | elf_sym__visibility(sym) != STV_HIDDEN && |
| 152 | elf_sym__visibility(sym) != STV_INTERNAL; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 153 | } |
| 154 | |
Arnaldo Carvalho de Melo | 3183f8c | 2018-04-26 16:52:34 -0300 | [diff] [blame] | 155 | static bool elf_sym__filter(GElf_Sym *sym) |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 156 | { |
Arnaldo Carvalho de Melo | 3183f8c | 2018-04-26 16:52:34 -0300 | [diff] [blame] | 157 | return elf_sym__is_function(sym) || elf_sym__is_object(sym); |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 158 | } |
| 159 | |
| 160 | static inline const char *elf_sym__name(const GElf_Sym *sym, |
| 161 | const Elf_Data *symstrs) |
| 162 | { |
| 163 | return symstrs->d_buf + sym->st_name; |
| 164 | } |
| 165 | |
| 166 | static inline const char *elf_sec__name(const GElf_Shdr *shdr, |
| 167 | const Elf_Data *secstrs) |
| 168 | { |
| 169 | return secstrs->d_buf + shdr->sh_name; |
| 170 | } |
| 171 | |
| 172 | static inline int elf_sec__is_text(const GElf_Shdr *shdr, |
| 173 | const Elf_Data *secstrs) |
| 174 | { |
| 175 | return strstr(elf_sec__name(shdr, secstrs), "text") != NULL; |
| 176 | } |
| 177 | |
| 178 | static inline bool elf_sec__is_data(const GElf_Shdr *shdr, |
| 179 | const Elf_Data *secstrs) |
| 180 | { |
| 181 | return strstr(elf_sec__name(shdr, secstrs), "data") != NULL; |
| 182 | } |
| 183 | |
Arnaldo Carvalho de Melo | 3183f8c | 2018-04-26 16:52:34 -0300 | [diff] [blame] | 184 | static bool elf_sec__filter(GElf_Shdr *shdr, Elf_Data *secstrs) |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 185 | { |
Arnaldo Carvalho de Melo | 3183f8c | 2018-04-26 16:52:34 -0300 | [diff] [blame] | 186 | return elf_sec__is_text(shdr, secstrs) || |
| 187 | elf_sec__is_data(shdr, secstrs); |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 188 | } |
| 189 | |
| 190 | static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr) |
| 191 | { |
| 192 | Elf_Scn *sec = NULL; |
| 193 | GElf_Shdr shdr; |
| 194 | size_t cnt = 1; |
| 195 | |
| 196 | while ((sec = elf_nextscn(elf, sec)) != NULL) { |
| 197 | gelf_getshdr(sec, &shdr); |
| 198 | |
| 199 | if ((addr >= shdr.sh_addr) && |
| 200 | (addr < (shdr.sh_addr + shdr.sh_size))) |
| 201 | return cnt; |
| 202 | |
| 203 | ++cnt; |
| 204 | } |
| 205 | |
| 206 | return -1; |
| 207 | } |
| 208 | |
Masami Hiramatsu | 99ca423 | 2014-01-16 09:39:49 +0000 | [diff] [blame] | 209 | Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep, |
| 210 | GElf_Shdr *shp, const char *name, size_t *idx) |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 211 | { |
| 212 | Elf_Scn *sec = NULL; |
| 213 | size_t cnt = 1; |
| 214 | |
Cody P Schafer | 4927465 | 2012-08-10 15:22:55 -0700 | [diff] [blame] | 215 | /* Elf is corrupted/truncated, avoid calling elf_strptr. */ |
| 216 | if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL)) |
| 217 | return NULL; |
| 218 | |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 219 | while ((sec = elf_nextscn(elf, sec)) != NULL) { |
| 220 | char *str; |
| 221 | |
| 222 | gelf_getshdr(sec, shp); |
| 223 | str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name); |
Jiri Olsa | 155b3a1 | 2014-03-02 14:32:07 +0100 | [diff] [blame] | 224 | if (str && !strcmp(name, str)) { |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 225 | if (idx) |
| 226 | *idx = cnt; |
Jiri Olsa | 155b3a1 | 2014-03-02 14:32:07 +0100 | [diff] [blame] | 227 | return sec; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 228 | } |
| 229 | ++cnt; |
| 230 | } |
| 231 | |
Jiri Olsa | 155b3a1 | 2014-03-02 14:32:07 +0100 | [diff] [blame] | 232 | return NULL; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 233 | } |
| 234 | |
Milian Wolff | 2a8d41b | 2016-08-30 13:41:02 +0200 | [diff] [blame] | 235 | static bool want_demangle(bool is_kernel_sym) |
| 236 | { |
| 237 | return is_kernel_sym ? symbol_conf.demangle_kernel : symbol_conf.demangle; |
| 238 | } |
| 239 | |
| 240 | static char *demangle_sym(struct dso *dso, int kmodule, const char *elf_name) |
| 241 | { |
Namhyung Kim | bb963e1 | 2017-02-17 17:17:38 +0900 | [diff] [blame] | 242 | int demangle_flags = verbose > 0 ? (DMGL_PARAMS | DMGL_ANSI) : DMGL_NO_OPTS; |
Milian Wolff | 2a8d41b | 2016-08-30 13:41:02 +0200 | [diff] [blame] | 243 | char *demangled = NULL; |
| 244 | |
| 245 | /* |
| 246 | * We need to figure out if the object was created from C++ sources |
| 247 | * DWARF DW_compile_unit has this, but we don't always have access |
| 248 | * to it... |
| 249 | */ |
| 250 | if (!want_demangle(dso->kernel || kmodule)) |
| 251 | return demangled; |
| 252 | |
| 253 | demangled = bfd_demangle(NULL, elf_name, demangle_flags); |
| 254 | if (demangled == NULL) |
| 255 | demangled = java_demangle_sym(elf_name, JAVA_DEMANGLE_NORET); |
| 256 | else if (rust_is_mangled(demangled)) |
| 257 | /* |
| 258 | * Input to Rust demangling is the BFD-demangled |
| 259 | * name which it Rust-demangles in place. |
| 260 | */ |
| 261 | rust_demangle_sym(demangled); |
| 262 | |
| 263 | return demangled; |
| 264 | } |
| 265 | |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 266 | #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \ |
| 267 | for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \ |
| 268 | idx < nr_entries; \ |
| 269 | ++idx, pos = gelf_getrel(reldata, idx, &pos_mem)) |
| 270 | |
| 271 | #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \ |
| 272 | for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \ |
| 273 | idx < nr_entries; \ |
| 274 | ++idx, pos = gelf_getrela(reldata, idx, &pos_mem)) |
| 275 | |
| 276 | /* |
| 277 | * We need to check if we have a .dynsym, so that we can handle the |
| 278 | * .plt, synthesizing its symbols, that aren't on the symtabs (be it |
| 279 | * .dynsym or .symtab). |
| 280 | * And always look at the original dso, not at debuginfo packages, that |
| 281 | * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS). |
| 282 | */ |
Arnaldo Carvalho de Melo | 3183f8c | 2018-04-26 16:52:34 -0300 | [diff] [blame] | 283 | int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss) |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 284 | { |
| 285 | uint32_t nr_rel_entries, idx; |
| 286 | GElf_Sym sym; |
Li Bin | b2f7605 | 2017-06-05 08:34:09 +0800 | [diff] [blame] | 287 | u64 plt_offset, plt_header_size, plt_entry_size; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 288 | GElf_Shdr shdr_plt; |
| 289 | struct symbol *f; |
| 290 | GElf_Shdr shdr_rel_plt, shdr_dynsym; |
| 291 | Elf_Data *reldata, *syms, *symstrs; |
| 292 | Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym; |
| 293 | size_t dynsym_idx; |
| 294 | GElf_Ehdr ehdr; |
| 295 | char sympltname[1024]; |
| 296 | Elf *elf; |
Cody P Schafer | a44f605 | 2012-08-10 15:22:59 -0700 | [diff] [blame] | 297 | int nr = 0, symidx, err = 0; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 298 | |
David Ahern | f47b58b | 2012-08-19 09:47:14 -0600 | [diff] [blame] | 299 | if (!ss->dynsym) |
| 300 | return 0; |
| 301 | |
Cody P Schafer | a44f605 | 2012-08-10 15:22:59 -0700 | [diff] [blame] | 302 | elf = ss->elf; |
| 303 | ehdr = ss->ehdr; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 304 | |
Cody P Schafer | a44f605 | 2012-08-10 15:22:59 -0700 | [diff] [blame] | 305 | scn_dynsym = ss->dynsym; |
| 306 | shdr_dynsym = ss->dynshdr; |
| 307 | dynsym_idx = ss->dynsym_idx; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 308 | |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 309 | if (scn_dynsym == NULL) |
| 310 | goto out_elf_end; |
| 311 | |
| 312 | scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, |
| 313 | ".rela.plt", NULL); |
| 314 | if (scn_plt_rel == NULL) { |
| 315 | scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, |
| 316 | ".rel.plt", NULL); |
| 317 | if (scn_plt_rel == NULL) |
| 318 | goto out_elf_end; |
| 319 | } |
| 320 | |
| 321 | err = -1; |
| 322 | |
| 323 | if (shdr_rel_plt.sh_link != dynsym_idx) |
| 324 | goto out_elf_end; |
| 325 | |
| 326 | if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL) |
| 327 | goto out_elf_end; |
| 328 | |
| 329 | /* |
| 330 | * Fetch the relocation section to find the idxes to the GOT |
| 331 | * and the symbols in the .dynsym they refer to. |
| 332 | */ |
| 333 | reldata = elf_getdata(scn_plt_rel, NULL); |
| 334 | if (reldata == NULL) |
| 335 | goto out_elf_end; |
| 336 | |
| 337 | syms = elf_getdata(scn_dynsym, NULL); |
| 338 | if (syms == NULL) |
| 339 | goto out_elf_end; |
| 340 | |
| 341 | scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link); |
| 342 | if (scn_symstrs == NULL) |
| 343 | goto out_elf_end; |
| 344 | |
| 345 | symstrs = elf_getdata(scn_symstrs, NULL); |
| 346 | if (symstrs == NULL) |
| 347 | goto out_elf_end; |
| 348 | |
Cody P Schafer | 52f9ddb | 2012-08-10 15:22:51 -0700 | [diff] [blame] | 349 | if (symstrs->d_size == 0) |
| 350 | goto out_elf_end; |
| 351 | |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 352 | nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize; |
| 353 | plt_offset = shdr_plt.sh_offset; |
Li Bin | b2f7605 | 2017-06-05 08:34:09 +0800 | [diff] [blame] | 354 | switch (ehdr.e_machine) { |
| 355 | case EM_ARM: |
| 356 | plt_header_size = 20; |
| 357 | plt_entry_size = 12; |
| 358 | break; |
| 359 | |
| 360 | case EM_AARCH64: |
| 361 | plt_header_size = 32; |
| 362 | plt_entry_size = 16; |
| 363 | break; |
| 364 | |
David Miller | d6afa56 | 2018-10-17 12:08:59 -0700 | [diff] [blame] | 365 | case EM_SPARC: |
| 366 | plt_header_size = 48; |
| 367 | plt_entry_size = 12; |
| 368 | break; |
| 369 | |
| 370 | case EM_SPARCV9: |
| 371 | plt_header_size = 128; |
| 372 | plt_entry_size = 32; |
| 373 | break; |
| 374 | |
| 375 | default: /* FIXME: s390/alpha/mips/parisc/poperpc/sh/xtensa need to be checked */ |
Li Bin | b2f7605 | 2017-06-05 08:34:09 +0800 | [diff] [blame] | 376 | plt_header_size = shdr_plt.sh_entsize; |
| 377 | plt_entry_size = shdr_plt.sh_entsize; |
| 378 | break; |
| 379 | } |
| 380 | plt_offset += plt_header_size; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 381 | |
| 382 | if (shdr_rel_plt.sh_type == SHT_RELA) { |
| 383 | GElf_Rela pos_mem, *pos; |
| 384 | |
| 385 | elf_section__for_each_rela(reldata, pos, pos_mem, idx, |
| 386 | nr_rel_entries) { |
Milian Wolff | 2a8d41b | 2016-08-30 13:41:02 +0200 | [diff] [blame] | 387 | const char *elf_name = NULL; |
| 388 | char *demangled = NULL; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 389 | symidx = GELF_R_SYM(pos->r_info); |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 390 | gelf_getsym(syms, symidx, &sym); |
Milian Wolff | 2a8d41b | 2016-08-30 13:41:02 +0200 | [diff] [blame] | 391 | |
| 392 | elf_name = elf_sym__name(&sym, symstrs); |
| 393 | demangled = demangle_sym(dso, 0, elf_name); |
| 394 | if (demangled != NULL) |
| 395 | elf_name = demangled; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 396 | snprintf(sympltname, sizeof(sympltname), |
Milian Wolff | 2a8d41b | 2016-08-30 13:41:02 +0200 | [diff] [blame] | 397 | "%s@plt", elf_name); |
| 398 | free(demangled); |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 399 | |
Li Bin | b2f7605 | 2017-06-05 08:34:09 +0800 | [diff] [blame] | 400 | f = symbol__new(plt_offset, plt_entry_size, |
Arnaldo Carvalho de Melo | af30bff | 2018-04-26 11:09:10 -0300 | [diff] [blame] | 401 | STB_GLOBAL, STT_FUNC, sympltname); |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 402 | if (!f) |
| 403 | goto out_elf_end; |
| 404 | |
Li Bin | b2f7605 | 2017-06-05 08:34:09 +0800 | [diff] [blame] | 405 | plt_offset += plt_entry_size; |
Arnaldo Carvalho de Melo | 3183f8c | 2018-04-26 16:52:34 -0300 | [diff] [blame] | 406 | symbols__insert(&dso->symbols, f); |
Arnaldo Carvalho de Melo | be39db9 | 2016-09-01 19:25:52 -0300 | [diff] [blame] | 407 | ++nr; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 408 | } |
| 409 | } else if (shdr_rel_plt.sh_type == SHT_REL) { |
| 410 | GElf_Rel pos_mem, *pos; |
| 411 | elf_section__for_each_rel(reldata, pos, pos_mem, idx, |
| 412 | nr_rel_entries) { |
Milian Wolff | 2a8d41b | 2016-08-30 13:41:02 +0200 | [diff] [blame] | 413 | const char *elf_name = NULL; |
| 414 | char *demangled = NULL; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 415 | symidx = GELF_R_SYM(pos->r_info); |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 416 | gelf_getsym(syms, symidx, &sym); |
Milian Wolff | 2a8d41b | 2016-08-30 13:41:02 +0200 | [diff] [blame] | 417 | |
| 418 | elf_name = elf_sym__name(&sym, symstrs); |
| 419 | demangled = demangle_sym(dso, 0, elf_name); |
| 420 | if (demangled != NULL) |
| 421 | elf_name = demangled; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 422 | snprintf(sympltname, sizeof(sympltname), |
Milian Wolff | 2a8d41b | 2016-08-30 13:41:02 +0200 | [diff] [blame] | 423 | "%s@plt", elf_name); |
| 424 | free(demangled); |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 425 | |
Li Bin | b2f7605 | 2017-06-05 08:34:09 +0800 | [diff] [blame] | 426 | f = symbol__new(plt_offset, plt_entry_size, |
Arnaldo Carvalho de Melo | af30bff | 2018-04-26 11:09:10 -0300 | [diff] [blame] | 427 | STB_GLOBAL, STT_FUNC, sympltname); |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 428 | if (!f) |
| 429 | goto out_elf_end; |
| 430 | |
Li Bin | b2f7605 | 2017-06-05 08:34:09 +0800 | [diff] [blame] | 431 | plt_offset += plt_entry_size; |
Arnaldo Carvalho de Melo | 3183f8c | 2018-04-26 16:52:34 -0300 | [diff] [blame] | 432 | symbols__insert(&dso->symbols, f); |
Arnaldo Carvalho de Melo | be39db9 | 2016-09-01 19:25:52 -0300 | [diff] [blame] | 433 | ++nr; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 434 | } |
| 435 | } |
| 436 | |
| 437 | err = 0; |
| 438 | out_elf_end: |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 439 | if (err == 0) |
| 440 | return nr; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 441 | pr_debug("%s: problems reading %s PLT info.\n", |
| 442 | __func__, dso->long_name); |
| 443 | return 0; |
| 444 | } |
| 445 | |
Milian Wolff | 80c345b | 2017-08-06 23:24:34 +0200 | [diff] [blame] | 446 | char *dso__demangle_sym(struct dso *dso, int kmodule, const char *elf_name) |
Jin Yao | a64489c | 2017-03-26 04:34:26 +0800 | [diff] [blame] | 447 | { |
| 448 | return demangle_sym(dso, kmodule, elf_name); |
| 449 | } |
| 450 | |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 451 | /* |
| 452 | * Align offset to 4 bytes as needed for note name and descriptor data. |
| 453 | */ |
| 454 | #define NOTE_ALIGN(n) (((n) + 3) & -4U) |
| 455 | |
| 456 | static int elf_read_build_id(Elf *elf, void *bf, size_t size) |
| 457 | { |
| 458 | int err = -1; |
| 459 | GElf_Ehdr ehdr; |
| 460 | GElf_Shdr shdr; |
| 461 | Elf_Data *data; |
| 462 | Elf_Scn *sec; |
| 463 | Elf_Kind ek; |
| 464 | void *ptr; |
| 465 | |
| 466 | if (size < BUILD_ID_SIZE) |
| 467 | goto out; |
| 468 | |
| 469 | ek = elf_kind(elf); |
| 470 | if (ek != ELF_K_ELF) |
| 471 | goto out; |
| 472 | |
| 473 | if (gelf_getehdr(elf, &ehdr) == NULL) { |
| 474 | pr_err("%s: cannot get elf header.\n", __func__); |
| 475 | goto out; |
| 476 | } |
| 477 | |
| 478 | /* |
| 479 | * Check following sections for notes: |
| 480 | * '.note.gnu.build-id' |
| 481 | * '.notes' |
| 482 | * '.note' (VDSO specific) |
| 483 | */ |
| 484 | do { |
| 485 | sec = elf_section_by_name(elf, &ehdr, &shdr, |
| 486 | ".note.gnu.build-id", NULL); |
| 487 | if (sec) |
| 488 | break; |
| 489 | |
| 490 | sec = elf_section_by_name(elf, &ehdr, &shdr, |
| 491 | ".notes", NULL); |
| 492 | if (sec) |
| 493 | break; |
| 494 | |
| 495 | sec = elf_section_by_name(elf, &ehdr, &shdr, |
| 496 | ".note", NULL); |
| 497 | if (sec) |
| 498 | break; |
| 499 | |
| 500 | return err; |
| 501 | |
| 502 | } while (0); |
| 503 | |
| 504 | data = elf_getdata(sec, NULL); |
| 505 | if (data == NULL) |
| 506 | goto out; |
| 507 | |
| 508 | ptr = data->d_buf; |
| 509 | while (ptr < (data->d_buf + data->d_size)) { |
| 510 | GElf_Nhdr *nhdr = ptr; |
| 511 | size_t namesz = NOTE_ALIGN(nhdr->n_namesz), |
| 512 | descsz = NOTE_ALIGN(nhdr->n_descsz); |
| 513 | const char *name; |
| 514 | |
| 515 | ptr += sizeof(*nhdr); |
| 516 | name = ptr; |
| 517 | ptr += namesz; |
| 518 | if (nhdr->n_type == NT_GNU_BUILD_ID && |
| 519 | nhdr->n_namesz == sizeof("GNU")) { |
| 520 | if (memcmp(name, "GNU", sizeof("GNU")) == 0) { |
| 521 | size_t sz = min(size, descsz); |
| 522 | memcpy(bf, ptr, sz); |
| 523 | memset(bf + sz, 0, size - sz); |
| 524 | err = descsz; |
| 525 | break; |
| 526 | } |
| 527 | } |
| 528 | ptr += descsz; |
| 529 | } |
| 530 | |
| 531 | out: |
| 532 | return err; |
| 533 | } |
| 534 | |
Remi Bernon | ba0509d | 2020-08-21 18:52:36 +0200 | [diff] [blame] | 535 | #ifdef HAVE_LIBBFD_BUILDID_SUPPORT |
| 536 | |
Jiri Olsa | f766819 | 2020-10-13 21:24:34 +0200 | [diff] [blame] | 537 | int filename__read_build_id(const char *filename, struct build_id *bid) |
Remi Bernon | ba0509d | 2020-08-21 18:52:36 +0200 | [diff] [blame] | 538 | { |
Jiri Olsa | f766819 | 2020-10-13 21:24:34 +0200 | [diff] [blame] | 539 | size_t size = sizeof(bid->data); |
Remi Bernon | ba0509d | 2020-08-21 18:52:36 +0200 | [diff] [blame] | 540 | int err = -1; |
| 541 | bfd *abfd; |
| 542 | |
| 543 | abfd = bfd_openr(filename, NULL); |
| 544 | if (!abfd) |
| 545 | return -1; |
| 546 | |
| 547 | if (!bfd_check_format(abfd, bfd_object)) { |
| 548 | pr_debug2("%s: cannot read %s bfd file.\n", __func__, filename); |
| 549 | goto out_close; |
| 550 | } |
| 551 | |
| 552 | if (!abfd->build_id || abfd->build_id->size > size) |
| 553 | goto out_close; |
| 554 | |
Jiri Olsa | f766819 | 2020-10-13 21:24:34 +0200 | [diff] [blame] | 555 | memcpy(bid->data, abfd->build_id->data, abfd->build_id->size); |
| 556 | memset(bid->data + abfd->build_id->size, 0, size - abfd->build_id->size); |
| 557 | err = bid->size = abfd->build_id->size; |
Remi Bernon | ba0509d | 2020-08-21 18:52:36 +0200 | [diff] [blame] | 558 | |
| 559 | out_close: |
| 560 | bfd_close(abfd); |
| 561 | return err; |
| 562 | } |
| 563 | |
| 564 | #else // HAVE_LIBBFD_BUILDID_SUPPORT |
| 565 | |
Jiri Olsa | f766819 | 2020-10-13 21:24:34 +0200 | [diff] [blame] | 566 | int filename__read_build_id(const char *filename, struct build_id *bid) |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 567 | { |
Jiri Olsa | f766819 | 2020-10-13 21:24:34 +0200 | [diff] [blame] | 568 | size_t size = sizeof(bid->data); |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 569 | int fd, err = -1; |
| 570 | Elf *elf; |
| 571 | |
| 572 | if (size < BUILD_ID_SIZE) |
| 573 | goto out; |
| 574 | |
| 575 | fd = open(filename, O_RDONLY); |
| 576 | if (fd < 0) |
| 577 | goto out; |
| 578 | |
| 579 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); |
| 580 | if (elf == NULL) { |
| 581 | pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename); |
| 582 | goto out_close; |
| 583 | } |
| 584 | |
Jiri Olsa | f766819 | 2020-10-13 21:24:34 +0200 | [diff] [blame] | 585 | err = elf_read_build_id(elf, bid->data, size); |
| 586 | if (err > 0) |
| 587 | bid->size = err; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 588 | |
| 589 | elf_end(elf); |
| 590 | out_close: |
| 591 | close(fd); |
| 592 | out: |
| 593 | return err; |
| 594 | } |
| 595 | |
Remi Bernon | ba0509d | 2020-08-21 18:52:36 +0200 | [diff] [blame] | 596 | #endif // HAVE_LIBBFD_BUILDID_SUPPORT |
| 597 | |
Jiri Olsa | 3ff1b8c | 2020-10-13 21:24:35 +0200 | [diff] [blame^] | 598 | int sysfs__read_build_id(const char *filename, struct build_id *bid) |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 599 | { |
Jiri Olsa | 3ff1b8c | 2020-10-13 21:24:35 +0200 | [diff] [blame^] | 600 | size_t size = sizeof(bid->data); |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 601 | int fd, err = -1; |
| 602 | |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 603 | fd = open(filename, O_RDONLY); |
| 604 | if (fd < 0) |
| 605 | goto out; |
| 606 | |
| 607 | while (1) { |
| 608 | char bf[BUFSIZ]; |
| 609 | GElf_Nhdr nhdr; |
| 610 | size_t namesz, descsz; |
| 611 | |
| 612 | if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr)) |
| 613 | break; |
| 614 | |
| 615 | namesz = NOTE_ALIGN(nhdr.n_namesz); |
| 616 | descsz = NOTE_ALIGN(nhdr.n_descsz); |
| 617 | if (nhdr.n_type == NT_GNU_BUILD_ID && |
| 618 | nhdr.n_namesz == sizeof("GNU")) { |
| 619 | if (read(fd, bf, namesz) != (ssize_t)namesz) |
| 620 | break; |
| 621 | if (memcmp(bf, "GNU", sizeof("GNU")) == 0) { |
| 622 | size_t sz = min(descsz, size); |
Jiri Olsa | 3ff1b8c | 2020-10-13 21:24:35 +0200 | [diff] [blame^] | 623 | if (read(fd, bid->data, sz) == (ssize_t)sz) { |
| 624 | memset(bid->data + sz, 0, size - sz); |
| 625 | bid->size = sz; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 626 | err = 0; |
| 627 | break; |
| 628 | } |
| 629 | } else if (read(fd, bf, descsz) != (ssize_t)descsz) |
| 630 | break; |
| 631 | } else { |
| 632 | int n = namesz + descsz; |
Arnaldo Carvalho de Melo | 7934c98 | 2017-01-03 15:19:21 -0300 | [diff] [blame] | 633 | |
| 634 | if (n > (int)sizeof(bf)) { |
| 635 | n = sizeof(bf); |
| 636 | pr_debug("%s: truncating reading of build id in sysfs file %s: n_namesz=%u, n_descsz=%u.\n", |
| 637 | __func__, filename, nhdr.n_namesz, nhdr.n_descsz); |
| 638 | } |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 639 | if (read(fd, bf, n) != n) |
| 640 | break; |
| 641 | } |
| 642 | } |
| 643 | close(fd); |
| 644 | out: |
| 645 | return err; |
| 646 | } |
| 647 | |
Remi Bernon | ba0509d | 2020-08-21 18:52:36 +0200 | [diff] [blame] | 648 | #ifdef HAVE_LIBBFD_SUPPORT |
| 649 | |
| 650 | int filename__read_debuglink(const char *filename, char *debuglink, |
| 651 | size_t size) |
| 652 | { |
| 653 | int err = -1; |
| 654 | asection *section; |
| 655 | bfd *abfd; |
| 656 | |
| 657 | abfd = bfd_openr(filename, NULL); |
| 658 | if (!abfd) |
| 659 | return -1; |
| 660 | |
| 661 | if (!bfd_check_format(abfd, bfd_object)) { |
| 662 | pr_debug2("%s: cannot read %s bfd file.\n", __func__, filename); |
| 663 | goto out_close; |
| 664 | } |
| 665 | |
| 666 | section = bfd_get_section_by_name(abfd, ".gnu_debuglink"); |
| 667 | if (!section) |
| 668 | goto out_close; |
| 669 | |
| 670 | if (section->size > size) |
| 671 | goto out_close; |
| 672 | |
| 673 | if (!bfd_get_section_contents(abfd, section, debuglink, 0, |
| 674 | section->size)) |
| 675 | goto out_close; |
| 676 | |
| 677 | err = 0; |
| 678 | |
| 679 | out_close: |
| 680 | bfd_close(abfd); |
| 681 | return err; |
| 682 | } |
| 683 | |
| 684 | #else |
| 685 | |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 686 | int filename__read_debuglink(const char *filename, char *debuglink, |
| 687 | size_t size) |
| 688 | { |
| 689 | int fd, err = -1; |
| 690 | Elf *elf; |
| 691 | GElf_Ehdr ehdr; |
| 692 | GElf_Shdr shdr; |
| 693 | Elf_Data *data; |
| 694 | Elf_Scn *sec; |
| 695 | Elf_Kind ek; |
| 696 | |
| 697 | fd = open(filename, O_RDONLY); |
| 698 | if (fd < 0) |
| 699 | goto out; |
| 700 | |
| 701 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); |
| 702 | if (elf == NULL) { |
| 703 | pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename); |
| 704 | goto out_close; |
| 705 | } |
| 706 | |
| 707 | ek = elf_kind(elf); |
| 708 | if (ek != ELF_K_ELF) |
Chenggang Qin | 784f339 | 2013-10-11 08:27:57 +0800 | [diff] [blame] | 709 | goto out_elf_end; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 710 | |
| 711 | if (gelf_getehdr(elf, &ehdr) == NULL) { |
| 712 | pr_err("%s: cannot get elf header.\n", __func__); |
Chenggang Qin | 784f339 | 2013-10-11 08:27:57 +0800 | [diff] [blame] | 713 | goto out_elf_end; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 714 | } |
| 715 | |
| 716 | sec = elf_section_by_name(elf, &ehdr, &shdr, |
| 717 | ".gnu_debuglink", NULL); |
| 718 | if (sec == NULL) |
Chenggang Qin | 784f339 | 2013-10-11 08:27:57 +0800 | [diff] [blame] | 719 | goto out_elf_end; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 720 | |
| 721 | data = elf_getdata(sec, NULL); |
| 722 | if (data == NULL) |
Chenggang Qin | 784f339 | 2013-10-11 08:27:57 +0800 | [diff] [blame] | 723 | goto out_elf_end; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 724 | |
| 725 | /* the start of this section is a zero-terminated string */ |
| 726 | strncpy(debuglink, data->d_buf, size); |
| 727 | |
Stephane Eranian | 0d3dc5e | 2014-02-20 10:32:55 +0900 | [diff] [blame] | 728 | err = 0; |
| 729 | |
Chenggang Qin | 784f339 | 2013-10-11 08:27:57 +0800 | [diff] [blame] | 730 | out_elf_end: |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 731 | elf_end(elf); |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 732 | out_close: |
| 733 | close(fd); |
| 734 | out: |
| 735 | return err; |
| 736 | } |
| 737 | |
Remi Bernon | ba0509d | 2020-08-21 18:52:36 +0200 | [diff] [blame] | 738 | #endif |
| 739 | |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 740 | static int dso__swap_init(struct dso *dso, unsigned char eidata) |
| 741 | { |
| 742 | static unsigned int const endian = 1; |
| 743 | |
| 744 | dso->needs_swap = DSO_SWAP__NO; |
| 745 | |
| 746 | switch (eidata) { |
| 747 | case ELFDATA2LSB: |
| 748 | /* We are big endian, DSO is little endian. */ |
| 749 | if (*(unsigned char const *)&endian != 1) |
| 750 | dso->needs_swap = DSO_SWAP__YES; |
| 751 | break; |
| 752 | |
| 753 | case ELFDATA2MSB: |
| 754 | /* We are little endian, DSO is big endian. */ |
| 755 | if (*(unsigned char const *)&endian != 0) |
| 756 | dso->needs_swap = DSO_SWAP__YES; |
| 757 | break; |
| 758 | |
| 759 | default: |
| 760 | pr_err("unrecognized DSO data encoding %d\n", eidata); |
| 761 | return -EINVAL; |
| 762 | } |
| 763 | |
| 764 | return 0; |
| 765 | } |
| 766 | |
Cody P Schafer | 3aafe5a | 2012-08-10 15:23:02 -0700 | [diff] [blame] | 767 | bool symsrc__possibly_runtime(struct symsrc *ss) |
| 768 | { |
| 769 | return ss->dynsym || ss->opdsec; |
| 770 | } |
| 771 | |
Cody P Schafer | d26cd12 | 2012-08-10 15:23:00 -0700 | [diff] [blame] | 772 | bool symsrc__has_symtab(struct symsrc *ss) |
| 773 | { |
| 774 | return ss->symtab != NULL; |
| 775 | } |
Cody P Schafer | b68e2f9 | 2012-08-10 15:22:57 -0700 | [diff] [blame] | 776 | |
| 777 | void symsrc__destroy(struct symsrc *ss) |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 778 | { |
Arnaldo Carvalho de Melo | 74cf249 | 2013-12-27 16:55:14 -0300 | [diff] [blame] | 779 | zfree(&ss->name); |
Cody P Schafer | b68e2f9 | 2012-08-10 15:22:57 -0700 | [diff] [blame] | 780 | elf_end(ss->elf); |
| 781 | close(ss->fd); |
| 782 | } |
| 783 | |
Leo Yan | 7eec00a | 2020-03-06 09:57:58 +0800 | [diff] [blame] | 784 | bool elf__needs_adjust_symbols(GElf_Ehdr ehdr) |
Naveen N. Rao | d233209 | 2015-04-28 17:35:35 +0530 | [diff] [blame] | 785 | { |
Leo Yan | 7eec00a | 2020-03-06 09:57:58 +0800 | [diff] [blame] | 786 | /* |
| 787 | * Usually vmlinux is an ELF file with type ET_EXEC for most |
| 788 | * architectures; except Arm64 kernel is linked with option |
| 789 | * '-share', so need to check type ET_DYN. |
| 790 | */ |
| 791 | return ehdr.e_type == ET_EXEC || ehdr.e_type == ET_REL || |
| 792 | ehdr.e_type == ET_DYN; |
Naveen N. Rao | d233209 | 2015-04-28 17:35:35 +0530 | [diff] [blame] | 793 | } |
| 794 | |
Cody P Schafer | b68e2f9 | 2012-08-10 15:22:57 -0700 | [diff] [blame] | 795 | int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name, |
| 796 | enum dso_binary_type type) |
| 797 | { |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 798 | GElf_Ehdr ehdr; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 799 | Elf *elf; |
Cody P Schafer | b68e2f9 | 2012-08-10 15:22:57 -0700 | [diff] [blame] | 800 | int fd; |
| 801 | |
Arnaldo Carvalho de Melo | 18425f1 | 2015-03-24 11:49:02 -0300 | [diff] [blame] | 802 | if (dso__needs_decompress(dso)) { |
Namhyung Kim | 42b3fa6 | 2017-06-08 16:31:03 +0900 | [diff] [blame] | 803 | fd = dso__decompress_kmodule_fd(dso, name); |
Arnaldo Carvalho de Melo | 18425f1 | 2015-03-24 11:49:02 -0300 | [diff] [blame] | 804 | if (fd < 0) |
| 805 | return -1; |
Namhyung Kim | c25ec42 | 2017-06-08 16:31:08 +0900 | [diff] [blame] | 806 | |
| 807 | type = dso->symtab_type; |
Arnaldo Carvalho de Melo | 18425f1 | 2015-03-24 11:49:02 -0300 | [diff] [blame] | 808 | } else { |
Namhyung Kim | c00c48f | 2014-11-04 10:14:27 +0900 | [diff] [blame] | 809 | fd = open(name, O_RDONLY); |
Arnaldo Carvalho de Melo | 18425f1 | 2015-03-24 11:49:02 -0300 | [diff] [blame] | 810 | if (fd < 0) { |
| 811 | dso->load_errno = errno; |
| 812 | return -1; |
| 813 | } |
| 814 | } |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 815 | |
| 816 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); |
| 817 | if (elf == NULL) { |
| 818 | pr_debug("%s: cannot read %s ELF file.\n", __func__, name); |
Arnaldo Carvalho de Melo | 18425f1 | 2015-03-24 11:49:02 -0300 | [diff] [blame] | 819 | dso->load_errno = DSO_LOAD_ERRNO__INVALID_ELF; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 820 | goto out_close; |
| 821 | } |
| 822 | |
| 823 | if (gelf_getehdr(elf, &ehdr) == NULL) { |
Arnaldo Carvalho de Melo | 18425f1 | 2015-03-24 11:49:02 -0300 | [diff] [blame] | 824 | dso->load_errno = DSO_LOAD_ERRNO__INVALID_ELF; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 825 | pr_debug("%s: cannot get elf header.\n", __func__); |
| 826 | goto out_elf_end; |
| 827 | } |
| 828 | |
Arnaldo Carvalho de Melo | 18425f1 | 2015-03-24 11:49:02 -0300 | [diff] [blame] | 829 | if (dso__swap_init(dso, ehdr.e_ident[EI_DATA])) { |
| 830 | dso->load_errno = DSO_LOAD_ERRNO__INTERNAL_ERROR; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 831 | goto out_elf_end; |
Arnaldo Carvalho de Melo | 18425f1 | 2015-03-24 11:49:02 -0300 | [diff] [blame] | 832 | } |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 833 | |
| 834 | /* Always reject images with a mismatched build-id: */ |
Masami Hiramatsu | 428aff8 | 2016-08-26 01:24:42 +0900 | [diff] [blame] | 835 | if (dso->has_build_id && !symbol_conf.ignore_vmlinux_buildid) { |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 836 | u8 build_id[BUILD_ID_SIZE]; |
| 837 | |
Arnaldo Carvalho de Melo | 18425f1 | 2015-03-24 11:49:02 -0300 | [diff] [blame] | 838 | if (elf_read_build_id(elf, build_id, BUILD_ID_SIZE) < 0) { |
| 839 | dso->load_errno = DSO_LOAD_ERRNO__CANNOT_READ_BUILDID; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 840 | goto out_elf_end; |
Arnaldo Carvalho de Melo | 18425f1 | 2015-03-24 11:49:02 -0300 | [diff] [blame] | 841 | } |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 842 | |
Arnaldo Carvalho de Melo | 18425f1 | 2015-03-24 11:49:02 -0300 | [diff] [blame] | 843 | if (!dso__build_id_equal(dso, build_id)) { |
Naveen N. Rao | 468f3d2 | 2015-04-25 01:14:46 +0530 | [diff] [blame] | 844 | pr_debug("%s: build id mismatch for %s.\n", __func__, name); |
Arnaldo Carvalho de Melo | 18425f1 | 2015-03-24 11:49:02 -0300 | [diff] [blame] | 845 | dso->load_errno = DSO_LOAD_ERRNO__MISMATCHING_BUILDID; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 846 | goto out_elf_end; |
Arnaldo Carvalho de Melo | 18425f1 | 2015-03-24 11:49:02 -0300 | [diff] [blame] | 847 | } |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 848 | } |
| 849 | |
Adrian Hunter | c6d8f2a | 2014-07-14 13:02:41 +0300 | [diff] [blame] | 850 | ss->is_64_bit = (gelf_getclass(elf) == ELFCLASS64); |
| 851 | |
Cody P Schafer | b68e2f9 | 2012-08-10 15:22:57 -0700 | [diff] [blame] | 852 | ss->symtab = elf_section_by_name(elf, &ehdr, &ss->symshdr, ".symtab", |
| 853 | NULL); |
| 854 | if (ss->symshdr.sh_type != SHT_SYMTAB) |
| 855 | ss->symtab = NULL; |
| 856 | |
| 857 | ss->dynsym_idx = 0; |
| 858 | ss->dynsym = elf_section_by_name(elf, &ehdr, &ss->dynshdr, ".dynsym", |
| 859 | &ss->dynsym_idx); |
| 860 | if (ss->dynshdr.sh_type != SHT_DYNSYM) |
| 861 | ss->dynsym = NULL; |
| 862 | |
| 863 | ss->opdidx = 0; |
| 864 | ss->opdsec = elf_section_by_name(elf, &ehdr, &ss->opdshdr, ".opd", |
| 865 | &ss->opdidx); |
| 866 | if (ss->opdshdr.sh_type != SHT_PROGBITS) |
| 867 | ss->opdsec = NULL; |
| 868 | |
Jiri Olsa | 1c695c8 | 2020-08-08 14:21:54 +0200 | [diff] [blame] | 869 | if (dso->kernel == DSO_SPACE__USER) |
Wang Nan | 99e87f7 | 2016-04-07 10:24:31 +0000 | [diff] [blame] | 870 | ss->adjust_symbols = true; |
| 871 | else |
Naveen N. Rao | d233209 | 2015-04-28 17:35:35 +0530 | [diff] [blame] | 872 | ss->adjust_symbols = elf__needs_adjust_symbols(ehdr); |
Cody P Schafer | b68e2f9 | 2012-08-10 15:22:57 -0700 | [diff] [blame] | 873 | |
| 874 | ss->name = strdup(name); |
Arnaldo Carvalho de Melo | 18425f1 | 2015-03-24 11:49:02 -0300 | [diff] [blame] | 875 | if (!ss->name) { |
| 876 | dso->load_errno = errno; |
Cody P Schafer | b68e2f9 | 2012-08-10 15:22:57 -0700 | [diff] [blame] | 877 | goto out_elf_end; |
Arnaldo Carvalho de Melo | 18425f1 | 2015-03-24 11:49:02 -0300 | [diff] [blame] | 878 | } |
Cody P Schafer | b68e2f9 | 2012-08-10 15:22:57 -0700 | [diff] [blame] | 879 | |
| 880 | ss->elf = elf; |
| 881 | ss->fd = fd; |
| 882 | ss->ehdr = ehdr; |
| 883 | ss->type = type; |
| 884 | |
| 885 | return 0; |
| 886 | |
| 887 | out_elf_end: |
| 888 | elf_end(elf); |
| 889 | out_close: |
| 890 | close(fd); |
Leo Yan | e5f177a | 2019-05-30 17:38:01 +0800 | [diff] [blame] | 891 | return -1; |
Cody P Schafer | b68e2f9 | 2012-08-10 15:22:57 -0700 | [diff] [blame] | 892 | } |
| 893 | |
Adrian Hunter | 39b12f78 | 2013-08-07 14:38:47 +0300 | [diff] [blame] | 894 | /** |
| 895 | * ref_reloc_sym_not_found - has kernel relocation symbol been found. |
| 896 | * @kmap: kernel maps and relocation reference symbol |
| 897 | * |
| 898 | * This function returns %true if we are dealing with the kernel maps and the |
| 899 | * relocation reference symbol has not yet been found. Otherwise %false is |
| 900 | * returned. |
| 901 | */ |
| 902 | static bool ref_reloc_sym_not_found(struct kmap *kmap) |
| 903 | { |
| 904 | return kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name && |
| 905 | !kmap->ref_reloc_sym->unrelocated_addr; |
| 906 | } |
| 907 | |
| 908 | /** |
| 909 | * ref_reloc - kernel relocation offset. |
| 910 | * @kmap: kernel maps and relocation reference symbol |
| 911 | * |
| 912 | * This function returns the offset of kernel addresses as determined by using |
| 913 | * the relocation reference symbol i.e. if the kernel has not been relocated |
| 914 | * then the return value is zero. |
| 915 | */ |
| 916 | static u64 ref_reloc(struct kmap *kmap) |
| 917 | { |
| 918 | if (kmap && kmap->ref_reloc_sym && |
| 919 | kmap->ref_reloc_sym->unrelocated_addr) |
| 920 | return kmap->ref_reloc_sym->addr - |
| 921 | kmap->ref_reloc_sym->unrelocated_addr; |
| 922 | return 0; |
| 923 | } |
| 924 | |
Naveen N. Rao | 0b3c226 | 2016-04-12 14:40:50 +0530 | [diff] [blame] | 925 | void __weak arch__sym_update(struct symbol *s __maybe_unused, |
| 926 | GElf_Sym *sym __maybe_unused) { } |
Ananth N Mavinakayanahalli | c50fc0a | 2015-04-28 17:35:38 +0530 | [diff] [blame] | 927 | |
Arnaldo Carvalho de Melo | 4e0d1e8 | 2018-04-27 15:15:24 -0300 | [diff] [blame] | 928 | static int dso__process_kernel_symbol(struct dso *dso, struct map *map, |
| 929 | GElf_Sym *sym, GElf_Shdr *shdr, |
Arnaldo Carvalho de Melo | 79b6bb7 | 2019-11-25 21:58:33 -0300 | [diff] [blame] | 930 | struct maps *kmaps, struct kmap *kmap, |
Arnaldo Carvalho de Melo | 4e0d1e8 | 2018-04-27 15:15:24 -0300 | [diff] [blame] | 931 | struct dso **curr_dsop, struct map **curr_mapp, |
| 932 | const char *section_name, |
| 933 | bool adjust_kernel_syms, bool kmodule, bool *remap_kernel) |
| 934 | { |
| 935 | struct dso *curr_dso = *curr_dsop; |
| 936 | struct map *curr_map; |
| 937 | char dso_name[PATH_MAX]; |
| 938 | |
| 939 | /* Adjust symbol to map to file offset */ |
| 940 | if (adjust_kernel_syms) |
| 941 | sym->st_value -= shdr->sh_addr - shdr->sh_offset; |
| 942 | |
| 943 | if (strcmp(section_name, (curr_dso->short_name + dso->short_name_len)) == 0) |
| 944 | return 0; |
| 945 | |
| 946 | if (strcmp(section_name, ".text") == 0) { |
| 947 | /* |
| 948 | * The initial kernel mapping is based on |
| 949 | * kallsyms and identity maps. Overwrite it to |
| 950 | * map to the kernel dso. |
| 951 | */ |
Jiri Olsa | b2fe96a | 2020-08-08 14:26:56 +0200 | [diff] [blame] | 952 | if (*remap_kernel && dso->kernel && !kmodule) { |
Arnaldo Carvalho de Melo | 4e0d1e8 | 2018-04-27 15:15:24 -0300 | [diff] [blame] | 953 | *remap_kernel = false; |
| 954 | map->start = shdr->sh_addr + ref_reloc(kmap); |
| 955 | map->end = map->start + shdr->sh_size; |
| 956 | map->pgoff = shdr->sh_offset; |
| 957 | map->map_ip = map__map_ip; |
| 958 | map->unmap_ip = map__unmap_ip; |
| 959 | /* Ensure maps are correctly ordered */ |
| 960 | if (kmaps) { |
| 961 | map__get(map); |
Arnaldo Carvalho de Melo | 79b6bb7 | 2019-11-25 21:58:33 -0300 | [diff] [blame] | 962 | maps__remove(kmaps, map); |
| 963 | maps__insert(kmaps, map); |
Arnaldo Carvalho de Melo | 4e0d1e8 | 2018-04-27 15:15:24 -0300 | [diff] [blame] | 964 | map__put(map); |
| 965 | } |
| 966 | } |
| 967 | |
| 968 | /* |
| 969 | * The initial module mapping is based on |
| 970 | * /proc/modules mapped to offset zero. |
| 971 | * Overwrite it to map to the module dso. |
| 972 | */ |
| 973 | if (*remap_kernel && kmodule) { |
| 974 | *remap_kernel = false; |
| 975 | map->pgoff = shdr->sh_offset; |
| 976 | } |
| 977 | |
| 978 | *curr_mapp = map; |
| 979 | *curr_dsop = dso; |
| 980 | return 0; |
| 981 | } |
| 982 | |
| 983 | if (!kmap) |
| 984 | return 0; |
| 985 | |
| 986 | snprintf(dso_name, sizeof(dso_name), "%s%s", dso->short_name, section_name); |
| 987 | |
Arnaldo Carvalho de Melo | 79b6bb7 | 2019-11-25 21:58:33 -0300 | [diff] [blame] | 988 | curr_map = maps__find_by_name(kmaps, dso_name); |
Arnaldo Carvalho de Melo | 4e0d1e8 | 2018-04-27 15:15:24 -0300 | [diff] [blame] | 989 | if (curr_map == NULL) { |
| 990 | u64 start = sym->st_value; |
| 991 | |
| 992 | if (kmodule) |
| 993 | start += map->start + shdr->sh_offset; |
| 994 | |
| 995 | curr_dso = dso__new(dso_name); |
| 996 | if (curr_dso == NULL) |
| 997 | return -1; |
| 998 | curr_dso->kernel = dso->kernel; |
| 999 | curr_dso->long_name = dso->long_name; |
| 1000 | curr_dso->long_name_len = dso->long_name_len; |
| 1001 | curr_map = map__new2(start, curr_dso); |
| 1002 | dso__put(curr_dso); |
| 1003 | if (curr_map == NULL) |
| 1004 | return -1; |
| 1005 | |
Arnaldo Carvalho de Melo | a75af86 | 2019-12-18 15:23:14 -0300 | [diff] [blame] | 1006 | if (curr_dso->kernel) |
| 1007 | map__kmap(curr_map)->kmaps = kmaps; |
| 1008 | |
Arnaldo Carvalho de Melo | 4e0d1e8 | 2018-04-27 15:15:24 -0300 | [diff] [blame] | 1009 | if (adjust_kernel_syms) { |
| 1010 | curr_map->start = shdr->sh_addr + ref_reloc(kmap); |
| 1011 | curr_map->end = curr_map->start + shdr->sh_size; |
| 1012 | curr_map->pgoff = shdr->sh_offset; |
| 1013 | } else { |
| 1014 | curr_map->map_ip = curr_map->unmap_ip = identity__map_ip; |
| 1015 | } |
| 1016 | curr_dso->symtab_type = dso->symtab_type; |
Arnaldo Carvalho de Melo | 79b6bb7 | 2019-11-25 21:58:33 -0300 | [diff] [blame] | 1017 | maps__insert(kmaps, curr_map); |
Arnaldo Carvalho de Melo | 4e0d1e8 | 2018-04-27 15:15:24 -0300 | [diff] [blame] | 1018 | /* |
| 1019 | * Add it before we drop the referece to curr_map, i.e. while |
| 1020 | * we still are sure to have a reference to this DSO via |
| 1021 | * *curr_map->dso. |
| 1022 | */ |
Arnaldo Carvalho de Melo | f2baa060 | 2019-11-04 16:09:48 -0300 | [diff] [blame] | 1023 | dsos__add(&kmaps->machine->dsos, curr_dso); |
Arnaldo Carvalho de Melo | 4e0d1e8 | 2018-04-27 15:15:24 -0300 | [diff] [blame] | 1024 | /* kmaps already got it */ |
| 1025 | map__put(curr_map); |
| 1026 | dso__set_loaded(curr_dso); |
| 1027 | *curr_mapp = curr_map; |
| 1028 | *curr_dsop = curr_dso; |
| 1029 | } else |
| 1030 | *curr_dsop = curr_map->dso; |
| 1031 | |
| 1032 | return 0; |
| 1033 | } |
| 1034 | |
Arnaldo Carvalho de Melo | be39db9 | 2016-09-01 19:25:52 -0300 | [diff] [blame] | 1035 | int dso__load_sym(struct dso *dso, struct map *map, struct symsrc *syms_ss, |
| 1036 | struct symsrc *runtime_ss, int kmodule) |
Cody P Schafer | b68e2f9 | 2012-08-10 15:22:57 -0700 | [diff] [blame] | 1037 | { |
| 1038 | struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL; |
Arnaldo Carvalho de Melo | 79b6bb7 | 2019-11-25 21:58:33 -0300 | [diff] [blame] | 1039 | struct maps *kmaps = kmap ? map__kmaps(map) : NULL; |
Cody P Schafer | b68e2f9 | 2012-08-10 15:22:57 -0700 | [diff] [blame] | 1040 | struct map *curr_map = map; |
| 1041 | struct dso *curr_dso = dso; |
| 1042 | Elf_Data *symstrs, *secstrs; |
| 1043 | uint32_t nr_syms; |
| 1044 | int err = -1; |
| 1045 | uint32_t idx; |
| 1046 | GElf_Ehdr ehdr; |
Cody P Schafer | 261360b | 2012-08-10 15:23:01 -0700 | [diff] [blame] | 1047 | GElf_Shdr shdr; |
Wang Nan | 73cdf0c | 2016-02-26 09:31:49 +0000 | [diff] [blame] | 1048 | GElf_Shdr tshdr; |
Cody P Schafer | b68e2f9 | 2012-08-10 15:22:57 -0700 | [diff] [blame] | 1049 | Elf_Data *syms, *opddata = NULL; |
| 1050 | GElf_Sym sym; |
Cody P Schafer | 261360b | 2012-08-10 15:23:01 -0700 | [diff] [blame] | 1051 | Elf_Scn *sec, *sec_strndx; |
Cody P Schafer | b68e2f9 | 2012-08-10 15:22:57 -0700 | [diff] [blame] | 1052 | Elf *elf; |
| 1053 | int nr = 0; |
Adrian Hunter | 39b12f78 | 2013-08-07 14:38:47 +0300 | [diff] [blame] | 1054 | bool remap_kernel = false, adjust_kernel_syms = false; |
Cody P Schafer | b68e2f9 | 2012-08-10 15:22:57 -0700 | [diff] [blame] | 1055 | |
Wang Nan | ba92732 | 2015-04-07 08:22:45 +0000 | [diff] [blame] | 1056 | if (kmap && !kmaps) |
| 1057 | return -1; |
| 1058 | |
Cody P Schafer | 261360b | 2012-08-10 15:23:01 -0700 | [diff] [blame] | 1059 | dso->symtab_type = syms_ss->type; |
Adrian Hunter | c6d8f2a | 2014-07-14 13:02:41 +0300 | [diff] [blame] | 1060 | dso->is_64_bit = syms_ss->is_64_bit; |
Adrian Hunter | 0131c4e | 2013-08-07 14:38:50 +0300 | [diff] [blame] | 1061 | dso->rel = syms_ss->ehdr.e_type == ET_REL; |
| 1062 | |
| 1063 | /* |
| 1064 | * Modules may already have symbols from kallsyms, but those symbols |
| 1065 | * have the wrong values for the dso maps, so remove them. |
| 1066 | */ |
| 1067 | if (kmodule && syms_ss->symtab) |
Arnaldo Carvalho de Melo | 3183f8c | 2018-04-26 16:52:34 -0300 | [diff] [blame] | 1068 | symbols__delete(&dso->symbols); |
Cody P Schafer | 005f929 | 2012-08-10 15:22:58 -0700 | [diff] [blame] | 1069 | |
Cody P Schafer | 261360b | 2012-08-10 15:23:01 -0700 | [diff] [blame] | 1070 | if (!syms_ss->symtab) { |
Anton Blanchard | d0b0d04 | 2014-09-09 08:59:29 +1000 | [diff] [blame] | 1071 | /* |
| 1072 | * If the vmlinux is stripped, fail so we will fall back |
| 1073 | * to using kallsyms. The vmlinux runtime symbols aren't |
| 1074 | * of much use. |
| 1075 | */ |
| 1076 | if (dso->kernel) |
| 1077 | goto out_elf_end; |
| 1078 | |
Cody P Schafer | 261360b | 2012-08-10 15:23:01 -0700 | [diff] [blame] | 1079 | syms_ss->symtab = syms_ss->dynsym; |
| 1080 | syms_ss->symshdr = syms_ss->dynshdr; |
Cody P Schafer | d26cd12 | 2012-08-10 15:23:00 -0700 | [diff] [blame] | 1081 | } |
| 1082 | |
Cody P Schafer | 261360b | 2012-08-10 15:23:01 -0700 | [diff] [blame] | 1083 | elf = syms_ss->elf; |
| 1084 | ehdr = syms_ss->ehdr; |
| 1085 | sec = syms_ss->symtab; |
| 1086 | shdr = syms_ss->symshdr; |
Cody P Schafer | b68e2f9 | 2012-08-10 15:22:57 -0700 | [diff] [blame] | 1087 | |
Anton Blanchard | 50de1a0 | 2016-08-13 11:55:33 +1000 | [diff] [blame] | 1088 | if (elf_section_by_name(runtime_ss->elf, &runtime_ss->ehdr, &tshdr, |
| 1089 | ".text", NULL)) |
Wang Nan | 73cdf0c | 2016-02-26 09:31:49 +0000 | [diff] [blame] | 1090 | dso->text_offset = tshdr.sh_addr - tshdr.sh_offset; |
| 1091 | |
Cody P Schafer | 261360b | 2012-08-10 15:23:01 -0700 | [diff] [blame] | 1092 | if (runtime_ss->opdsec) |
| 1093 | opddata = elf_rawdata(runtime_ss->opdsec, NULL); |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1094 | |
| 1095 | syms = elf_getdata(sec, NULL); |
| 1096 | if (syms == NULL) |
| 1097 | goto out_elf_end; |
| 1098 | |
| 1099 | sec = elf_getscn(elf, shdr.sh_link); |
| 1100 | if (sec == NULL) |
| 1101 | goto out_elf_end; |
| 1102 | |
| 1103 | symstrs = elf_getdata(sec, NULL); |
| 1104 | if (symstrs == NULL) |
| 1105 | goto out_elf_end; |
| 1106 | |
Adrian Hunter | f247fb8 | 2014-07-31 09:00:46 +0300 | [diff] [blame] | 1107 | sec_strndx = elf_getscn(runtime_ss->elf, runtime_ss->ehdr.e_shstrndx); |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1108 | if (sec_strndx == NULL) |
| 1109 | goto out_elf_end; |
| 1110 | |
| 1111 | secstrs = elf_getdata(sec_strndx, NULL); |
| 1112 | if (secstrs == NULL) |
| 1113 | goto out_elf_end; |
| 1114 | |
| 1115 | nr_syms = shdr.sh_size / shdr.sh_entsize; |
| 1116 | |
| 1117 | memset(&sym, 0, sizeof(sym)); |
Adrian Hunter | 39b12f78 | 2013-08-07 14:38:47 +0300 | [diff] [blame] | 1118 | |
| 1119 | /* |
| 1120 | * The kernel relocation symbol is needed in advance in order to adjust |
| 1121 | * kernel maps correctly. |
| 1122 | */ |
| 1123 | if (ref_reloc_sym_not_found(kmap)) { |
| 1124 | elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) { |
| 1125 | const char *elf_name = elf_sym__name(&sym, symstrs); |
| 1126 | |
| 1127 | if (strcmp(elf_name, kmap->ref_reloc_sym->name)) |
| 1128 | continue; |
| 1129 | kmap->ref_reloc_sym->unrelocated_addr = sym.st_value; |
Adrian Hunter | 9176753 | 2014-01-29 16:14:36 +0200 | [diff] [blame] | 1130 | map->reloc = kmap->ref_reloc_sym->addr - |
| 1131 | kmap->ref_reloc_sym->unrelocated_addr; |
Adrian Hunter | 39b12f78 | 2013-08-07 14:38:47 +0300 | [diff] [blame] | 1132 | break; |
| 1133 | } |
| 1134 | } |
| 1135 | |
Adrian Hunter | f0ee3b4 | 2015-08-14 15:50:06 +0300 | [diff] [blame] | 1136 | /* |
| 1137 | * Handle any relocation of vdso necessary because older kernels |
| 1138 | * attempted to prelink vdso to its virtual address. |
| 1139 | */ |
Wang Nan | 73cdf0c | 2016-02-26 09:31:49 +0000 | [diff] [blame] | 1140 | if (dso__is_vdso(dso)) |
| 1141 | map->reloc = map->start - dso->text_offset; |
Adrian Hunter | f0ee3b4 | 2015-08-14 15:50:06 +0300 | [diff] [blame] | 1142 | |
Adrian Hunter | 39b12f78 | 2013-08-07 14:38:47 +0300 | [diff] [blame] | 1143 | dso->adjust_symbols = runtime_ss->adjust_symbols || ref_reloc(kmap); |
| 1144 | /* |
Arnaldo Carvalho de Melo | d1fd8d9 | 2018-04-26 12:36:37 -0300 | [diff] [blame] | 1145 | * Initial kernel and module mappings do not map to the dso. |
| 1146 | * Flag the fixups. |
Adrian Hunter | 39b12f78 | 2013-08-07 14:38:47 +0300 | [diff] [blame] | 1147 | */ |
Jiri Olsa | b2fe96a | 2020-08-08 14:26:56 +0200 | [diff] [blame] | 1148 | if (dso->kernel) { |
Adrian Hunter | 39b12f78 | 2013-08-07 14:38:47 +0300 | [diff] [blame] | 1149 | remap_kernel = true; |
| 1150 | adjust_kernel_syms = dso->adjust_symbols; |
| 1151 | } |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1152 | elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) { |
| 1153 | struct symbol *f; |
| 1154 | const char *elf_name = elf_sym__name(&sym, symstrs); |
| 1155 | char *demangled = NULL; |
| 1156 | int is_label = elf_sym__is_label(&sym); |
| 1157 | const char *section_name; |
Cody P Schafer | 261360b | 2012-08-10 15:23:01 -0700 | [diff] [blame] | 1158 | bool used_opd = false; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1159 | |
Arnaldo Carvalho de Melo | 3183f8c | 2018-04-26 16:52:34 -0300 | [diff] [blame] | 1160 | if (!is_label && !elf_sym__filter(&sym)) |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1161 | continue; |
| 1162 | |
| 1163 | /* Reject ARM ELF "mapping symbols": these aren't unique and |
| 1164 | * don't identify functions, so will confuse the profile |
| 1165 | * output: */ |
Victor Kamensky | 4886f2c | 2015-01-26 22:34:01 -0800 | [diff] [blame] | 1166 | if (ehdr.e_machine == EM_ARM || ehdr.e_machine == EM_AARCH64) { |
| 1167 | if (elf_name[0] == '$' && strchr("adtx", elf_name[1]) |
| 1168 | && (elf_name[2] == '\0' || elf_name[2] == '.')) |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1169 | continue; |
| 1170 | } |
| 1171 | |
Cody P Schafer | 261360b | 2012-08-10 15:23:01 -0700 | [diff] [blame] | 1172 | if (runtime_ss->opdsec && sym.st_shndx == runtime_ss->opdidx) { |
| 1173 | u32 offset = sym.st_value - syms_ss->opdshdr.sh_addr; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1174 | u64 *opd = opddata->d_buf + offset; |
| 1175 | sym.st_value = DSO__SWAP(dso, u64, *opd); |
Cody P Schafer | 261360b | 2012-08-10 15:23:01 -0700 | [diff] [blame] | 1176 | sym.st_shndx = elf_addr_to_index(runtime_ss->elf, |
| 1177 | sym.st_value); |
| 1178 | used_opd = true; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1179 | } |
Namhyung Kim | 3843b05 | 2012-11-21 13:49:44 +0100 | [diff] [blame] | 1180 | /* |
| 1181 | * When loading symbols in a data mapping, ABS symbols (which |
| 1182 | * has a value of SHN_ABS in its st_shndx) failed at |
| 1183 | * elf_getscn(). And it marks the loading as a failure so |
| 1184 | * already loaded symbols cannot be fixed up. |
| 1185 | * |
| 1186 | * I'm not sure what should be done. Just ignore them for now. |
| 1187 | * - Namhyung Kim |
| 1188 | */ |
| 1189 | if (sym.st_shndx == SHN_ABS) |
| 1190 | continue; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1191 | |
Cody P Schafer | 261360b | 2012-08-10 15:23:01 -0700 | [diff] [blame] | 1192 | sec = elf_getscn(runtime_ss->elf, sym.st_shndx); |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1193 | if (!sec) |
| 1194 | goto out_elf_end; |
| 1195 | |
| 1196 | gelf_getshdr(sec, &shdr); |
| 1197 | |
Arnaldo Carvalho de Melo | 3183f8c | 2018-04-26 16:52:34 -0300 | [diff] [blame] | 1198 | if (is_label && !elf_sec__filter(&shdr, secstrs)) |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1199 | continue; |
| 1200 | |
| 1201 | section_name = elf_sec__name(&shdr, secstrs); |
| 1202 | |
| 1203 | /* On ARM, symbols for thumb functions have 1 added to |
| 1204 | * the symbol address as a flag - remove it */ |
| 1205 | if ((ehdr.e_machine == EM_ARM) && |
Arnaldo Carvalho de Melo | 18231d7 | 2018-04-26 12:45:17 -0300 | [diff] [blame] | 1206 | (GELF_ST_TYPE(sym.st_info) == STT_FUNC) && |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1207 | (sym.st_value & 1)) |
| 1208 | --sym.st_value; |
| 1209 | |
Jiri Olsa | b2fe96a | 2020-08-08 14:26:56 +0200 | [diff] [blame] | 1210 | if (dso->kernel) { |
Arnaldo Carvalho de Melo | 4e0d1e8 | 2018-04-27 15:15:24 -0300 | [diff] [blame] | 1211 | if (dso__process_kernel_symbol(dso, map, &sym, &shdr, kmaps, kmap, &curr_dso, &curr_map, |
| 1212 | section_name, adjust_kernel_syms, kmodule, &remap_kernel)) |
| 1213 | goto out_elf_end; |
Arnaldo Carvalho de Melo | 857140e | 2018-04-27 10:53:14 -0300 | [diff] [blame] | 1214 | } else if ((used_opd && runtime_ss->adjust_symbols) || |
| 1215 | (!used_opd && syms_ss->adjust_symbols)) { |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1216 | pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " " |
| 1217 | "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__, |
| 1218 | (u64)sym.st_value, (u64)shdr.sh_addr, |
| 1219 | (u64)shdr.sh_offset); |
| 1220 | sym.st_value -= shdr.sh_addr - shdr.sh_offset; |
| 1221 | } |
Arnaldo Carvalho de Melo | 4e0d1e8 | 2018-04-27 15:15:24 -0300 | [diff] [blame] | 1222 | |
Milian Wolff | 2a8d41b | 2016-08-30 13:41:02 +0200 | [diff] [blame] | 1223 | demangled = demangle_sym(dso, kmodule, elf_name); |
| 1224 | if (demangled != NULL) |
| 1225 | elf_name = demangled; |
Namhyung Kim | e71e794 | 2014-07-31 14:47:42 +0900 | [diff] [blame] | 1226 | |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1227 | f = symbol__new(sym.st_value, sym.st_size, |
Arnaldo Carvalho de Melo | af30bff | 2018-04-26 11:09:10 -0300 | [diff] [blame] | 1228 | GELF_ST_BIND(sym.st_info), |
| 1229 | GELF_ST_TYPE(sym.st_info), elf_name); |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1230 | free(demangled); |
| 1231 | if (!f) |
| 1232 | goto out_elf_end; |
| 1233 | |
Naveen N. Rao | 0b3c226 | 2016-04-12 14:40:50 +0530 | [diff] [blame] | 1234 | arch__sym_update(f, &sym); |
| 1235 | |
Arnaldo Carvalho de Melo | 3183f8c | 2018-04-26 16:52:34 -0300 | [diff] [blame] | 1236 | __symbols__insert(&curr_dso->symbols, f, dso->kernel); |
Arnaldo Carvalho de Melo | be39db9 | 2016-09-01 19:25:52 -0300 | [diff] [blame] | 1237 | nr++; |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1238 | } |
| 1239 | |
| 1240 | /* |
| 1241 | * For misannotated, zeroed, ASM function sizes. |
| 1242 | */ |
| 1243 | if (nr > 0) { |
Arnaldo Carvalho de Melo | 3183f8c | 2018-04-26 16:52:34 -0300 | [diff] [blame] | 1244 | symbols__fixup_end(&dso->symbols); |
| 1245 | symbols__fixup_duplicate(&dso->symbols); |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1246 | if (kmap) { |
| 1247 | /* |
| 1248 | * We need to fixup this here too because we create new |
| 1249 | * maps here, for things like vsyscall sections. |
| 1250 | */ |
Arnaldo Carvalho de Melo | 79b6bb7 | 2019-11-25 21:58:33 -0300 | [diff] [blame] | 1251 | maps__fixup_end(kmaps); |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1252 | } |
| 1253 | } |
| 1254 | err = nr; |
| 1255 | out_elf_end: |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 1256 | return err; |
| 1257 | } |
| 1258 | |
Adrian Hunter | 8e0cf96 | 2013-08-07 14:38:51 +0300 | [diff] [blame] | 1259 | static int elf_read_maps(Elf *elf, bool exe, mapfn_t mapfn, void *data) |
| 1260 | { |
| 1261 | GElf_Phdr phdr; |
| 1262 | size_t i, phdrnum; |
| 1263 | int err; |
| 1264 | u64 sz; |
| 1265 | |
| 1266 | if (elf_getphdrnum(elf, &phdrnum)) |
| 1267 | return -1; |
| 1268 | |
| 1269 | for (i = 0; i < phdrnum; i++) { |
| 1270 | if (gelf_getphdr(elf, i, &phdr) == NULL) |
| 1271 | return -1; |
| 1272 | if (phdr.p_type != PT_LOAD) |
| 1273 | continue; |
| 1274 | if (exe) { |
| 1275 | if (!(phdr.p_flags & PF_X)) |
| 1276 | continue; |
| 1277 | } else { |
| 1278 | if (!(phdr.p_flags & PF_R)) |
| 1279 | continue; |
| 1280 | } |
| 1281 | sz = min(phdr.p_memsz, phdr.p_filesz); |
| 1282 | if (!sz) |
| 1283 | continue; |
| 1284 | err = mapfn(phdr.p_vaddr, sz, phdr.p_offset, data); |
| 1285 | if (err) |
| 1286 | return err; |
| 1287 | } |
| 1288 | return 0; |
| 1289 | } |
| 1290 | |
| 1291 | int file__read_maps(int fd, bool exe, mapfn_t mapfn, void *data, |
| 1292 | bool *is_64_bit) |
| 1293 | { |
| 1294 | int err; |
| 1295 | Elf *elf; |
| 1296 | |
| 1297 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); |
| 1298 | if (elf == NULL) |
| 1299 | return -1; |
| 1300 | |
| 1301 | if (is_64_bit) |
| 1302 | *is_64_bit = (gelf_getclass(elf) == ELFCLASS64); |
| 1303 | |
| 1304 | err = elf_read_maps(elf, exe, mapfn, data); |
| 1305 | |
| 1306 | elf_end(elf); |
| 1307 | return err; |
| 1308 | } |
| 1309 | |
Adrian Hunter | 2b5b8bb | 2014-07-22 16:17:59 +0300 | [diff] [blame] | 1310 | enum dso_type dso__type_fd(int fd) |
| 1311 | { |
| 1312 | enum dso_type dso_type = DSO__TYPE_UNKNOWN; |
| 1313 | GElf_Ehdr ehdr; |
| 1314 | Elf_Kind ek; |
| 1315 | Elf *elf; |
| 1316 | |
| 1317 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); |
| 1318 | if (elf == NULL) |
| 1319 | goto out; |
| 1320 | |
| 1321 | ek = elf_kind(elf); |
| 1322 | if (ek != ELF_K_ELF) |
| 1323 | goto out_end; |
| 1324 | |
| 1325 | if (gelf_getclass(elf) == ELFCLASS64) { |
| 1326 | dso_type = DSO__TYPE_64BIT; |
| 1327 | goto out_end; |
| 1328 | } |
| 1329 | |
| 1330 | if (gelf_getehdr(elf, &ehdr) == NULL) |
| 1331 | goto out_end; |
| 1332 | |
| 1333 | if (ehdr.e_machine == EM_X86_64) |
| 1334 | dso_type = DSO__TYPE_X32BIT; |
| 1335 | else |
| 1336 | dso_type = DSO__TYPE_32BIT; |
| 1337 | out_end: |
| 1338 | elf_end(elf); |
| 1339 | out: |
| 1340 | return dso_type; |
| 1341 | } |
| 1342 | |
Adrian Hunter | afba19d | 2013-10-09 15:01:12 +0300 | [diff] [blame] | 1343 | static int copy_bytes(int from, off_t from_offs, int to, off_t to_offs, u64 len) |
| 1344 | { |
| 1345 | ssize_t r; |
| 1346 | size_t n; |
| 1347 | int err = -1; |
| 1348 | char *buf = malloc(page_size); |
| 1349 | |
| 1350 | if (buf == NULL) |
| 1351 | return -1; |
| 1352 | |
| 1353 | if (lseek(to, to_offs, SEEK_SET) != to_offs) |
| 1354 | goto out; |
| 1355 | |
| 1356 | if (lseek(from, from_offs, SEEK_SET) != from_offs) |
| 1357 | goto out; |
| 1358 | |
| 1359 | while (len) { |
| 1360 | n = page_size; |
| 1361 | if (len < n) |
| 1362 | n = len; |
| 1363 | /* Use read because mmap won't work on proc files */ |
| 1364 | r = read(from, buf, n); |
| 1365 | if (r < 0) |
| 1366 | goto out; |
| 1367 | if (!r) |
| 1368 | break; |
| 1369 | n = r; |
| 1370 | r = write(to, buf, n); |
| 1371 | if (r < 0) |
| 1372 | goto out; |
| 1373 | if ((size_t)r != n) |
| 1374 | goto out; |
| 1375 | len -= n; |
| 1376 | } |
| 1377 | |
| 1378 | err = 0; |
| 1379 | out: |
| 1380 | free(buf); |
| 1381 | return err; |
| 1382 | } |
| 1383 | |
| 1384 | struct kcore { |
| 1385 | int fd; |
| 1386 | int elfclass; |
| 1387 | Elf *elf; |
| 1388 | GElf_Ehdr ehdr; |
| 1389 | }; |
| 1390 | |
| 1391 | static int kcore__open(struct kcore *kcore, const char *filename) |
| 1392 | { |
| 1393 | GElf_Ehdr *ehdr; |
| 1394 | |
| 1395 | kcore->fd = open(filename, O_RDONLY); |
| 1396 | if (kcore->fd == -1) |
| 1397 | return -1; |
| 1398 | |
| 1399 | kcore->elf = elf_begin(kcore->fd, ELF_C_READ, NULL); |
| 1400 | if (!kcore->elf) |
| 1401 | goto out_close; |
| 1402 | |
| 1403 | kcore->elfclass = gelf_getclass(kcore->elf); |
| 1404 | if (kcore->elfclass == ELFCLASSNONE) |
| 1405 | goto out_end; |
| 1406 | |
| 1407 | ehdr = gelf_getehdr(kcore->elf, &kcore->ehdr); |
| 1408 | if (!ehdr) |
| 1409 | goto out_end; |
| 1410 | |
| 1411 | return 0; |
| 1412 | |
| 1413 | out_end: |
| 1414 | elf_end(kcore->elf); |
| 1415 | out_close: |
| 1416 | close(kcore->fd); |
| 1417 | return -1; |
| 1418 | } |
| 1419 | |
| 1420 | static int kcore__init(struct kcore *kcore, char *filename, int elfclass, |
| 1421 | bool temp) |
| 1422 | { |
Adrian Hunter | afba19d | 2013-10-09 15:01:12 +0300 | [diff] [blame] | 1423 | kcore->elfclass = elfclass; |
| 1424 | |
| 1425 | if (temp) |
| 1426 | kcore->fd = mkstemp(filename); |
| 1427 | else |
| 1428 | kcore->fd = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0400); |
| 1429 | if (kcore->fd == -1) |
| 1430 | return -1; |
| 1431 | |
| 1432 | kcore->elf = elf_begin(kcore->fd, ELF_C_WRITE, NULL); |
| 1433 | if (!kcore->elf) |
| 1434 | goto out_close; |
| 1435 | |
| 1436 | if (!gelf_newehdr(kcore->elf, elfclass)) |
| 1437 | goto out_end; |
| 1438 | |
Adrian Hunter | b5cabbc | 2015-09-24 13:05:22 +0300 | [diff] [blame] | 1439 | memset(&kcore->ehdr, 0, sizeof(GElf_Ehdr)); |
Adrian Hunter | afba19d | 2013-10-09 15:01:12 +0300 | [diff] [blame] | 1440 | |
| 1441 | return 0; |
| 1442 | |
| 1443 | out_end: |
| 1444 | elf_end(kcore->elf); |
| 1445 | out_close: |
| 1446 | close(kcore->fd); |
| 1447 | unlink(filename); |
| 1448 | return -1; |
| 1449 | } |
| 1450 | |
| 1451 | static void kcore__close(struct kcore *kcore) |
| 1452 | { |
| 1453 | elf_end(kcore->elf); |
| 1454 | close(kcore->fd); |
| 1455 | } |
| 1456 | |
| 1457 | static int kcore__copy_hdr(struct kcore *from, struct kcore *to, size_t count) |
| 1458 | { |
| 1459 | GElf_Ehdr *ehdr = &to->ehdr; |
| 1460 | GElf_Ehdr *kehdr = &from->ehdr; |
| 1461 | |
| 1462 | memcpy(ehdr->e_ident, kehdr->e_ident, EI_NIDENT); |
| 1463 | ehdr->e_type = kehdr->e_type; |
| 1464 | ehdr->e_machine = kehdr->e_machine; |
| 1465 | ehdr->e_version = kehdr->e_version; |
| 1466 | ehdr->e_entry = 0; |
| 1467 | ehdr->e_shoff = 0; |
| 1468 | ehdr->e_flags = kehdr->e_flags; |
| 1469 | ehdr->e_phnum = count; |
| 1470 | ehdr->e_shentsize = 0; |
| 1471 | ehdr->e_shnum = 0; |
| 1472 | ehdr->e_shstrndx = 0; |
| 1473 | |
| 1474 | if (from->elfclass == ELFCLASS32) { |
| 1475 | ehdr->e_phoff = sizeof(Elf32_Ehdr); |
| 1476 | ehdr->e_ehsize = sizeof(Elf32_Ehdr); |
| 1477 | ehdr->e_phentsize = sizeof(Elf32_Phdr); |
| 1478 | } else { |
| 1479 | ehdr->e_phoff = sizeof(Elf64_Ehdr); |
| 1480 | ehdr->e_ehsize = sizeof(Elf64_Ehdr); |
| 1481 | ehdr->e_phentsize = sizeof(Elf64_Phdr); |
| 1482 | } |
| 1483 | |
| 1484 | if (!gelf_update_ehdr(to->elf, ehdr)) |
| 1485 | return -1; |
| 1486 | |
| 1487 | if (!gelf_newphdr(to->elf, count)) |
| 1488 | return -1; |
| 1489 | |
| 1490 | return 0; |
| 1491 | } |
| 1492 | |
| 1493 | static int kcore__add_phdr(struct kcore *kcore, int idx, off_t offset, |
| 1494 | u64 addr, u64 len) |
| 1495 | { |
Adrian Hunter | b5cabbc | 2015-09-24 13:05:22 +0300 | [diff] [blame] | 1496 | GElf_Phdr phdr = { |
| 1497 | .p_type = PT_LOAD, |
| 1498 | .p_flags = PF_R | PF_W | PF_X, |
| 1499 | .p_offset = offset, |
| 1500 | .p_vaddr = addr, |
| 1501 | .p_paddr = 0, |
| 1502 | .p_filesz = len, |
| 1503 | .p_memsz = len, |
| 1504 | .p_align = page_size, |
| 1505 | }; |
Adrian Hunter | afba19d | 2013-10-09 15:01:12 +0300 | [diff] [blame] | 1506 | |
Adrian Hunter | b5cabbc | 2015-09-24 13:05:22 +0300 | [diff] [blame] | 1507 | if (!gelf_update_phdr(kcore->elf, idx, &phdr)) |
Adrian Hunter | afba19d | 2013-10-09 15:01:12 +0300 | [diff] [blame] | 1508 | return -1; |
| 1509 | |
| 1510 | return 0; |
| 1511 | } |
| 1512 | |
| 1513 | static off_t kcore__write(struct kcore *kcore) |
| 1514 | { |
| 1515 | return elf_update(kcore->elf, ELF_C_WRITE); |
| 1516 | } |
| 1517 | |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1518 | struct phdr_data { |
| 1519 | off_t offset; |
Adrian Hunter | 15acef6 | 2018-05-22 13:54:41 +0300 | [diff] [blame] | 1520 | off_t rel; |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1521 | u64 addr; |
| 1522 | u64 len; |
Adrian Hunter | f683820 | 2018-05-22 13:54:38 +0300 | [diff] [blame] | 1523 | struct list_head node; |
Adrian Hunter | 22916fd | 2018-05-22 13:54:45 +0300 | [diff] [blame] | 1524 | struct phdr_data *remaps; |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1525 | }; |
| 1526 | |
Adrian Hunter | a1a3a06 | 2018-05-22 13:54:44 +0300 | [diff] [blame] | 1527 | struct sym_data { |
| 1528 | u64 addr; |
| 1529 | struct list_head node; |
| 1530 | }; |
| 1531 | |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1532 | struct kcore_copy_info { |
| 1533 | u64 stext; |
| 1534 | u64 etext; |
| 1535 | u64 first_symbol; |
| 1536 | u64 last_symbol; |
| 1537 | u64 first_module; |
Adrian Hunter | 61f82e3 | 2020-05-12 15:19:16 +0300 | [diff] [blame] | 1538 | u64 first_module_symbol; |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1539 | u64 last_module_symbol; |
Adrian Hunter | 6e97957 | 2018-05-22 13:54:39 +0300 | [diff] [blame] | 1540 | size_t phnum; |
Adrian Hunter | f683820 | 2018-05-22 13:54:38 +0300 | [diff] [blame] | 1541 | struct list_head phdrs; |
Adrian Hunter | a1a3a06 | 2018-05-22 13:54:44 +0300 | [diff] [blame] | 1542 | struct list_head syms; |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1543 | }; |
| 1544 | |
Adrian Hunter | 15acef6 | 2018-05-22 13:54:41 +0300 | [diff] [blame] | 1545 | #define kcore_copy__for_each_phdr(k, p) \ |
| 1546 | list_for_each_entry((p), &(k)->phdrs, node) |
| 1547 | |
Adrian Hunter | b4503cd | 2018-05-22 13:54:43 +0300 | [diff] [blame] | 1548 | static struct phdr_data *phdr_data__new(u64 addr, u64 len, off_t offset) |
| 1549 | { |
| 1550 | struct phdr_data *p = zalloc(sizeof(*p)); |
| 1551 | |
| 1552 | if (p) { |
| 1553 | p->addr = addr; |
| 1554 | p->len = len; |
| 1555 | p->offset = offset; |
| 1556 | } |
| 1557 | |
| 1558 | return p; |
| 1559 | } |
| 1560 | |
| 1561 | static struct phdr_data *kcore_copy_info__addnew(struct kcore_copy_info *kci, |
| 1562 | u64 addr, u64 len, |
| 1563 | off_t offset) |
| 1564 | { |
| 1565 | struct phdr_data *p = phdr_data__new(addr, len, offset); |
| 1566 | |
| 1567 | if (p) |
| 1568 | list_add_tail(&p->node, &kci->phdrs); |
| 1569 | |
| 1570 | return p; |
| 1571 | } |
| 1572 | |
| 1573 | static void kcore_copy__free_phdrs(struct kcore_copy_info *kci) |
| 1574 | { |
| 1575 | struct phdr_data *p, *tmp; |
| 1576 | |
| 1577 | list_for_each_entry_safe(p, tmp, &kci->phdrs, node) { |
Arnaldo Carvalho de Melo | e56fbc9 | 2019-07-04 12:13:46 -0300 | [diff] [blame] | 1578 | list_del_init(&p->node); |
Adrian Hunter | b4503cd | 2018-05-22 13:54:43 +0300 | [diff] [blame] | 1579 | free(p); |
| 1580 | } |
| 1581 | } |
| 1582 | |
Adrian Hunter | a1a3a06 | 2018-05-22 13:54:44 +0300 | [diff] [blame] | 1583 | static struct sym_data *kcore_copy__new_sym(struct kcore_copy_info *kci, |
| 1584 | u64 addr) |
| 1585 | { |
| 1586 | struct sym_data *s = zalloc(sizeof(*s)); |
| 1587 | |
| 1588 | if (s) { |
| 1589 | s->addr = addr; |
| 1590 | list_add_tail(&s->node, &kci->syms); |
| 1591 | } |
| 1592 | |
| 1593 | return s; |
| 1594 | } |
| 1595 | |
| 1596 | static void kcore_copy__free_syms(struct kcore_copy_info *kci) |
| 1597 | { |
| 1598 | struct sym_data *s, *tmp; |
| 1599 | |
| 1600 | list_for_each_entry_safe(s, tmp, &kci->syms, node) { |
Arnaldo Carvalho de Melo | e56fbc9 | 2019-07-04 12:13:46 -0300 | [diff] [blame] | 1601 | list_del_init(&s->node); |
Adrian Hunter | a1a3a06 | 2018-05-22 13:54:44 +0300 | [diff] [blame] | 1602 | free(s); |
| 1603 | } |
| 1604 | } |
| 1605 | |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1606 | static int kcore_copy__process_kallsyms(void *arg, const char *name, char type, |
| 1607 | u64 start) |
| 1608 | { |
| 1609 | struct kcore_copy_info *kci = arg; |
| 1610 | |
Arnaldo Carvalho de Melo | e85e0e0 | 2018-04-25 17:16:31 -0300 | [diff] [blame] | 1611 | if (!kallsyms__is_function(type)) |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1612 | return 0; |
| 1613 | |
| 1614 | if (strchr(name, '[')) { |
Adrian Hunter | 61f82e3 | 2020-05-12 15:19:16 +0300 | [diff] [blame] | 1615 | if (!kci->first_module_symbol || start < kci->first_module_symbol) |
| 1616 | kci->first_module_symbol = start; |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1617 | if (start > kci->last_module_symbol) |
| 1618 | kci->last_module_symbol = start; |
| 1619 | return 0; |
| 1620 | } |
| 1621 | |
| 1622 | if (!kci->first_symbol || start < kci->first_symbol) |
| 1623 | kci->first_symbol = start; |
| 1624 | |
| 1625 | if (!kci->last_symbol || start > kci->last_symbol) |
| 1626 | kci->last_symbol = start; |
| 1627 | |
| 1628 | if (!strcmp(name, "_stext")) { |
| 1629 | kci->stext = start; |
| 1630 | return 0; |
| 1631 | } |
| 1632 | |
| 1633 | if (!strcmp(name, "_etext")) { |
| 1634 | kci->etext = start; |
| 1635 | return 0; |
| 1636 | } |
| 1637 | |
Adrian Hunter | a1a3a06 | 2018-05-22 13:54:44 +0300 | [diff] [blame] | 1638 | if (is_entry_trampoline(name) && !kcore_copy__new_sym(kci, start)) |
| 1639 | return -1; |
| 1640 | |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1641 | return 0; |
| 1642 | } |
| 1643 | |
| 1644 | static int kcore_copy__parse_kallsyms(struct kcore_copy_info *kci, |
| 1645 | const char *dir) |
| 1646 | { |
| 1647 | char kallsyms_filename[PATH_MAX]; |
| 1648 | |
| 1649 | scnprintf(kallsyms_filename, PATH_MAX, "%s/kallsyms", dir); |
| 1650 | |
| 1651 | if (symbol__restricted_filename(kallsyms_filename, "/proc/kallsyms")) |
| 1652 | return -1; |
| 1653 | |
| 1654 | if (kallsyms__parse(kallsyms_filename, kci, |
| 1655 | kcore_copy__process_kallsyms) < 0) |
| 1656 | return -1; |
| 1657 | |
| 1658 | return 0; |
| 1659 | } |
| 1660 | |
| 1661 | static int kcore_copy__process_modules(void *arg, |
| 1662 | const char *name __maybe_unused, |
Thomas Richter | 9ad4652 | 2017-08-03 15:49:02 +0200 | [diff] [blame] | 1663 | u64 start, u64 size __maybe_unused) |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1664 | { |
| 1665 | struct kcore_copy_info *kci = arg; |
| 1666 | |
| 1667 | if (!kci->first_module || start < kci->first_module) |
| 1668 | kci->first_module = start; |
| 1669 | |
| 1670 | return 0; |
| 1671 | } |
| 1672 | |
| 1673 | static int kcore_copy__parse_modules(struct kcore_copy_info *kci, |
| 1674 | const char *dir) |
| 1675 | { |
| 1676 | char modules_filename[PATH_MAX]; |
| 1677 | |
| 1678 | scnprintf(modules_filename, PATH_MAX, "%s/modules", dir); |
| 1679 | |
| 1680 | if (symbol__restricted_filename(modules_filename, "/proc/modules")) |
| 1681 | return -1; |
| 1682 | |
| 1683 | if (modules__parse(modules_filename, kci, |
| 1684 | kcore_copy__process_modules) < 0) |
| 1685 | return -1; |
| 1686 | |
| 1687 | return 0; |
| 1688 | } |
| 1689 | |
Adrian Hunter | b4503cd | 2018-05-22 13:54:43 +0300 | [diff] [blame] | 1690 | static int kcore_copy__map(struct kcore_copy_info *kci, u64 start, u64 end, |
| 1691 | u64 pgoff, u64 s, u64 e) |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1692 | { |
Adrian Hunter | b4503cd | 2018-05-22 13:54:43 +0300 | [diff] [blame] | 1693 | u64 len, offset; |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1694 | |
Adrian Hunter | b4503cd | 2018-05-22 13:54:43 +0300 | [diff] [blame] | 1695 | if (s < start || s >= end) |
| 1696 | return 0; |
| 1697 | |
| 1698 | offset = (s - start) + pgoff; |
| 1699 | len = e < end ? e - s : end - s; |
| 1700 | |
| 1701 | return kcore_copy_info__addnew(kci, s, len, offset) ? 0 : -1; |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1702 | } |
| 1703 | |
| 1704 | static int kcore_copy__read_map(u64 start, u64 len, u64 pgoff, void *data) |
| 1705 | { |
| 1706 | struct kcore_copy_info *kci = data; |
| 1707 | u64 end = start + len; |
Adrian Hunter | a1a3a06 | 2018-05-22 13:54:44 +0300 | [diff] [blame] | 1708 | struct sym_data *sdat; |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1709 | |
Adrian Hunter | b4503cd | 2018-05-22 13:54:43 +0300 | [diff] [blame] | 1710 | if (kcore_copy__map(kci, start, end, pgoff, kci->stext, kci->etext)) |
| 1711 | return -1; |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1712 | |
Adrian Hunter | b4503cd | 2018-05-22 13:54:43 +0300 | [diff] [blame] | 1713 | if (kcore_copy__map(kci, start, end, pgoff, kci->first_module, |
| 1714 | kci->last_module_symbol)) |
| 1715 | return -1; |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1716 | |
Adrian Hunter | a1a3a06 | 2018-05-22 13:54:44 +0300 | [diff] [blame] | 1717 | list_for_each_entry(sdat, &kci->syms, node) { |
| 1718 | u64 s = round_down(sdat->addr, page_size); |
| 1719 | |
| 1720 | if (kcore_copy__map(kci, start, end, pgoff, s, s + len)) |
| 1721 | return -1; |
| 1722 | } |
| 1723 | |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1724 | return 0; |
| 1725 | } |
| 1726 | |
| 1727 | static int kcore_copy__read_maps(struct kcore_copy_info *kci, Elf *elf) |
| 1728 | { |
| 1729 | if (elf_read_maps(elf, true, kcore_copy__read_map, kci) < 0) |
| 1730 | return -1; |
| 1731 | |
| 1732 | return 0; |
| 1733 | } |
| 1734 | |
Adrian Hunter | 22916fd | 2018-05-22 13:54:45 +0300 | [diff] [blame] | 1735 | static void kcore_copy__find_remaps(struct kcore_copy_info *kci) |
| 1736 | { |
| 1737 | struct phdr_data *p, *k = NULL; |
| 1738 | u64 kend; |
| 1739 | |
| 1740 | if (!kci->stext) |
| 1741 | return; |
| 1742 | |
| 1743 | /* Find phdr that corresponds to the kernel map (contains stext) */ |
| 1744 | kcore_copy__for_each_phdr(kci, p) { |
| 1745 | u64 pend = p->addr + p->len - 1; |
| 1746 | |
| 1747 | if (p->addr <= kci->stext && pend >= kci->stext) { |
| 1748 | k = p; |
| 1749 | break; |
| 1750 | } |
| 1751 | } |
| 1752 | |
| 1753 | if (!k) |
| 1754 | return; |
| 1755 | |
| 1756 | kend = k->offset + k->len; |
| 1757 | |
| 1758 | /* Find phdrs that remap the kernel */ |
| 1759 | kcore_copy__for_each_phdr(kci, p) { |
| 1760 | u64 pend = p->offset + p->len; |
| 1761 | |
| 1762 | if (p == k) |
| 1763 | continue; |
| 1764 | |
| 1765 | if (p->offset >= k->offset && pend <= kend) |
| 1766 | p->remaps = k; |
| 1767 | } |
| 1768 | } |
| 1769 | |
Adrian Hunter | 15acef6 | 2018-05-22 13:54:41 +0300 | [diff] [blame] | 1770 | static void kcore_copy__layout(struct kcore_copy_info *kci) |
| 1771 | { |
| 1772 | struct phdr_data *p; |
| 1773 | off_t rel = 0; |
| 1774 | |
Adrian Hunter | 22916fd | 2018-05-22 13:54:45 +0300 | [diff] [blame] | 1775 | kcore_copy__find_remaps(kci); |
| 1776 | |
Adrian Hunter | 15acef6 | 2018-05-22 13:54:41 +0300 | [diff] [blame] | 1777 | kcore_copy__for_each_phdr(kci, p) { |
Adrian Hunter | 22916fd | 2018-05-22 13:54:45 +0300 | [diff] [blame] | 1778 | if (!p->remaps) { |
| 1779 | p->rel = rel; |
| 1780 | rel += p->len; |
| 1781 | } |
Adrian Hunter | 15acef6 | 2018-05-22 13:54:41 +0300 | [diff] [blame] | 1782 | kci->phnum += 1; |
| 1783 | } |
Adrian Hunter | 22916fd | 2018-05-22 13:54:45 +0300 | [diff] [blame] | 1784 | |
| 1785 | kcore_copy__for_each_phdr(kci, p) { |
| 1786 | struct phdr_data *k = p->remaps; |
| 1787 | |
| 1788 | if (k) |
| 1789 | p->rel = p->offset - k->offset + k->rel; |
| 1790 | } |
Adrian Hunter | 15acef6 | 2018-05-22 13:54:41 +0300 | [diff] [blame] | 1791 | } |
| 1792 | |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1793 | static int kcore_copy__calc_maps(struct kcore_copy_info *kci, const char *dir, |
| 1794 | Elf *elf) |
| 1795 | { |
| 1796 | if (kcore_copy__parse_kallsyms(kci, dir)) |
| 1797 | return -1; |
| 1798 | |
| 1799 | if (kcore_copy__parse_modules(kci, dir)) |
| 1800 | return -1; |
| 1801 | |
| 1802 | if (kci->stext) |
| 1803 | kci->stext = round_down(kci->stext, page_size); |
| 1804 | else |
| 1805 | kci->stext = round_down(kci->first_symbol, page_size); |
| 1806 | |
| 1807 | if (kci->etext) { |
| 1808 | kci->etext = round_up(kci->etext, page_size); |
| 1809 | } else if (kci->last_symbol) { |
| 1810 | kci->etext = round_up(kci->last_symbol, page_size); |
| 1811 | kci->etext += page_size; |
| 1812 | } |
| 1813 | |
Adrian Hunter | 61f82e3 | 2020-05-12 15:19:16 +0300 | [diff] [blame] | 1814 | if (kci->first_module_symbol && |
| 1815 | (!kci->first_module || kci->first_module_symbol < kci->first_module)) |
| 1816 | kci->first_module = kci->first_module_symbol; |
| 1817 | |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1818 | kci->first_module = round_down(kci->first_module, page_size); |
| 1819 | |
| 1820 | if (kci->last_module_symbol) { |
| 1821 | kci->last_module_symbol = round_up(kci->last_module_symbol, |
| 1822 | page_size); |
| 1823 | kci->last_module_symbol += page_size; |
| 1824 | } |
| 1825 | |
| 1826 | if (!kci->stext || !kci->etext) |
| 1827 | return -1; |
| 1828 | |
| 1829 | if (kci->first_module && !kci->last_module_symbol) |
| 1830 | return -1; |
| 1831 | |
Adrian Hunter | 15acef6 | 2018-05-22 13:54:41 +0300 | [diff] [blame] | 1832 | if (kcore_copy__read_maps(kci, elf)) |
| 1833 | return -1; |
| 1834 | |
| 1835 | kcore_copy__layout(kci); |
| 1836 | |
| 1837 | return 0; |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1838 | } |
| 1839 | |
| 1840 | static int kcore_copy__copy_file(const char *from_dir, const char *to_dir, |
| 1841 | const char *name) |
| 1842 | { |
| 1843 | char from_filename[PATH_MAX]; |
| 1844 | char to_filename[PATH_MAX]; |
| 1845 | |
| 1846 | scnprintf(from_filename, PATH_MAX, "%s/%s", from_dir, name); |
| 1847 | scnprintf(to_filename, PATH_MAX, "%s/%s", to_dir, name); |
| 1848 | |
| 1849 | return copyfile_mode(from_filename, to_filename, 0400); |
| 1850 | } |
| 1851 | |
| 1852 | static int kcore_copy__unlink(const char *dir, const char *name) |
| 1853 | { |
| 1854 | char filename[PATH_MAX]; |
| 1855 | |
| 1856 | scnprintf(filename, PATH_MAX, "%s/%s", dir, name); |
| 1857 | |
| 1858 | return unlink(filename); |
| 1859 | } |
| 1860 | |
| 1861 | static int kcore_copy__compare_fds(int from, int to) |
| 1862 | { |
| 1863 | char *buf_from; |
| 1864 | char *buf_to; |
| 1865 | ssize_t ret; |
| 1866 | size_t len; |
| 1867 | int err = -1; |
| 1868 | |
| 1869 | buf_from = malloc(page_size); |
| 1870 | buf_to = malloc(page_size); |
| 1871 | if (!buf_from || !buf_to) |
| 1872 | goto out; |
| 1873 | |
| 1874 | while (1) { |
| 1875 | /* Use read because mmap won't work on proc files */ |
| 1876 | ret = read(from, buf_from, page_size); |
| 1877 | if (ret < 0) |
| 1878 | goto out; |
| 1879 | |
| 1880 | if (!ret) |
| 1881 | break; |
| 1882 | |
| 1883 | len = ret; |
| 1884 | |
| 1885 | if (readn(to, buf_to, len) != (int)len) |
| 1886 | goto out; |
| 1887 | |
| 1888 | if (memcmp(buf_from, buf_to, len)) |
| 1889 | goto out; |
| 1890 | } |
| 1891 | |
| 1892 | err = 0; |
| 1893 | out: |
| 1894 | free(buf_to); |
| 1895 | free(buf_from); |
| 1896 | return err; |
| 1897 | } |
| 1898 | |
| 1899 | static int kcore_copy__compare_files(const char *from_filename, |
| 1900 | const char *to_filename) |
| 1901 | { |
| 1902 | int from, to, err = -1; |
| 1903 | |
| 1904 | from = open(from_filename, O_RDONLY); |
| 1905 | if (from < 0) |
| 1906 | return -1; |
| 1907 | |
| 1908 | to = open(to_filename, O_RDONLY); |
| 1909 | if (to < 0) |
| 1910 | goto out_close_from; |
| 1911 | |
| 1912 | err = kcore_copy__compare_fds(from, to); |
| 1913 | |
| 1914 | close(to); |
| 1915 | out_close_from: |
| 1916 | close(from); |
| 1917 | return err; |
| 1918 | } |
| 1919 | |
| 1920 | static int kcore_copy__compare_file(const char *from_dir, const char *to_dir, |
| 1921 | const char *name) |
| 1922 | { |
| 1923 | char from_filename[PATH_MAX]; |
| 1924 | char to_filename[PATH_MAX]; |
| 1925 | |
| 1926 | scnprintf(from_filename, PATH_MAX, "%s/%s", from_dir, name); |
| 1927 | scnprintf(to_filename, PATH_MAX, "%s/%s", to_dir, name); |
| 1928 | |
| 1929 | return kcore_copy__compare_files(from_filename, to_filename); |
| 1930 | } |
| 1931 | |
| 1932 | /** |
| 1933 | * kcore_copy - copy kallsyms, modules and kcore from one directory to another. |
| 1934 | * @from_dir: from directory |
| 1935 | * @to_dir: to directory |
| 1936 | * |
| 1937 | * This function copies kallsyms, modules and kcore files from one directory to |
| 1938 | * another. kallsyms and modules are copied entirely. Only code segments are |
| 1939 | * copied from kcore. It is assumed that two segments suffice: one for the |
| 1940 | * kernel proper and one for all the modules. The code segments are determined |
| 1941 | * from kallsyms and modules files. The kernel map starts at _stext or the |
| 1942 | * lowest function symbol, and ends at _etext or the highest function symbol. |
| 1943 | * The module map starts at the lowest module address and ends at the highest |
| 1944 | * module symbol. Start addresses are rounded down to the nearest page. End |
| 1945 | * addresses are rounded up to the nearest page. An extra page is added to the |
| 1946 | * highest kernel symbol and highest module symbol to, hopefully, encompass that |
| 1947 | * symbol too. Because it contains only code sections, the resulting kcore is |
| 1948 | * unusual. One significant peculiarity is that the mapping (start -> pgoff) |
| 1949 | * is not the same for the kernel map and the modules map. That happens because |
| 1950 | * the data is copied adjacently whereas the original kcore has gaps. Finally, |
| 1951 | * kallsyms and modules files are compared with their copies to check that |
| 1952 | * modules have not been loaded or unloaded while the copies were taking place. |
| 1953 | * |
| 1954 | * Return: %0 on success, %-1 on failure. |
| 1955 | */ |
| 1956 | int kcore_copy(const char *from_dir, const char *to_dir) |
| 1957 | { |
| 1958 | struct kcore kcore; |
| 1959 | struct kcore extract; |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1960 | int idx = 0, err = -1; |
Adrian Hunter | d2c9598 | 2018-05-22 13:54:42 +0300 | [diff] [blame] | 1961 | off_t offset, sz; |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1962 | struct kcore_copy_info kci = { .stext = 0, }; |
| 1963 | char kcore_filename[PATH_MAX]; |
| 1964 | char extract_filename[PATH_MAX]; |
Adrian Hunter | d2c9598 | 2018-05-22 13:54:42 +0300 | [diff] [blame] | 1965 | struct phdr_data *p; |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1966 | |
Adrian Hunter | f683820 | 2018-05-22 13:54:38 +0300 | [diff] [blame] | 1967 | INIT_LIST_HEAD(&kci.phdrs); |
Adrian Hunter | a1a3a06 | 2018-05-22 13:54:44 +0300 | [diff] [blame] | 1968 | INIT_LIST_HEAD(&kci.syms); |
Adrian Hunter | f683820 | 2018-05-22 13:54:38 +0300 | [diff] [blame] | 1969 | |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1970 | if (kcore_copy__copy_file(from_dir, to_dir, "kallsyms")) |
| 1971 | return -1; |
| 1972 | |
| 1973 | if (kcore_copy__copy_file(from_dir, to_dir, "modules")) |
| 1974 | goto out_unlink_kallsyms; |
| 1975 | |
| 1976 | scnprintf(kcore_filename, PATH_MAX, "%s/kcore", from_dir); |
| 1977 | scnprintf(extract_filename, PATH_MAX, "%s/kcore", to_dir); |
| 1978 | |
| 1979 | if (kcore__open(&kcore, kcore_filename)) |
| 1980 | goto out_unlink_modules; |
| 1981 | |
| 1982 | if (kcore_copy__calc_maps(&kci, from_dir, kcore.elf)) |
| 1983 | goto out_kcore_close; |
| 1984 | |
| 1985 | if (kcore__init(&extract, extract_filename, kcore.elfclass, false)) |
| 1986 | goto out_kcore_close; |
| 1987 | |
Adrian Hunter | 6e97957 | 2018-05-22 13:54:39 +0300 | [diff] [blame] | 1988 | if (kcore__copy_hdr(&kcore, &extract, kci.phnum)) |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1989 | goto out_extract_close; |
| 1990 | |
Adrian Hunter | c9dd1d8 | 2018-05-22 13:54:40 +0300 | [diff] [blame] | 1991 | offset = gelf_fsize(extract.elf, ELF_T_EHDR, 1, EV_CURRENT) + |
| 1992 | gelf_fsize(extract.elf, ELF_T_PHDR, kci.phnum, EV_CURRENT); |
| 1993 | offset = round_up(offset, page_size); |
| 1994 | |
Adrian Hunter | d2c9598 | 2018-05-22 13:54:42 +0300 | [diff] [blame] | 1995 | kcore_copy__for_each_phdr(&kci, p) { |
| 1996 | off_t offs = p->rel + offset; |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1997 | |
Adrian Hunter | d2c9598 | 2018-05-22 13:54:42 +0300 | [diff] [blame] | 1998 | if (kcore__add_phdr(&extract, idx++, offs, p->addr, p->len)) |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 1999 | goto out_extract_close; |
| 2000 | } |
| 2001 | |
| 2002 | sz = kcore__write(&extract); |
| 2003 | if (sz < 0 || sz > offset) |
| 2004 | goto out_extract_close; |
| 2005 | |
Adrian Hunter | d2c9598 | 2018-05-22 13:54:42 +0300 | [diff] [blame] | 2006 | kcore_copy__for_each_phdr(&kci, p) { |
| 2007 | off_t offs = p->rel + offset; |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 2008 | |
Adrian Hunter | 22916fd | 2018-05-22 13:54:45 +0300 | [diff] [blame] | 2009 | if (p->remaps) |
| 2010 | continue; |
Adrian Hunter | d2c9598 | 2018-05-22 13:54:42 +0300 | [diff] [blame] | 2011 | if (copy_bytes(kcore.fd, p->offset, extract.fd, offs, p->len)) |
| 2012 | goto out_extract_close; |
| 2013 | } |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 2014 | |
| 2015 | if (kcore_copy__compare_file(from_dir, to_dir, "modules")) |
| 2016 | goto out_extract_close; |
| 2017 | |
| 2018 | if (kcore_copy__compare_file(from_dir, to_dir, "kallsyms")) |
| 2019 | goto out_extract_close; |
| 2020 | |
| 2021 | err = 0; |
| 2022 | |
| 2023 | out_extract_close: |
| 2024 | kcore__close(&extract); |
| 2025 | if (err) |
| 2026 | unlink(extract_filename); |
| 2027 | out_kcore_close: |
| 2028 | kcore__close(&kcore); |
| 2029 | out_unlink_modules: |
| 2030 | if (err) |
| 2031 | kcore_copy__unlink(to_dir, "modules"); |
| 2032 | out_unlink_kallsyms: |
| 2033 | if (err) |
| 2034 | kcore_copy__unlink(to_dir, "kallsyms"); |
| 2035 | |
Adrian Hunter | b4503cd | 2018-05-22 13:54:43 +0300 | [diff] [blame] | 2036 | kcore_copy__free_phdrs(&kci); |
Adrian Hunter | a1a3a06 | 2018-05-22 13:54:44 +0300 | [diff] [blame] | 2037 | kcore_copy__free_syms(&kci); |
Adrian Hunter | b4503cd | 2018-05-22 13:54:43 +0300 | [diff] [blame] | 2038 | |
Adrian Hunter | fc1b691 | 2013-10-14 16:57:29 +0300 | [diff] [blame] | 2039 | return err; |
| 2040 | } |
| 2041 | |
Adrian Hunter | afba19d | 2013-10-09 15:01:12 +0300 | [diff] [blame] | 2042 | int kcore_extract__create(struct kcore_extract *kce) |
| 2043 | { |
| 2044 | struct kcore kcore; |
| 2045 | struct kcore extract; |
| 2046 | size_t count = 1; |
| 2047 | int idx = 0, err = -1; |
| 2048 | off_t offset = page_size, sz; |
| 2049 | |
| 2050 | if (kcore__open(&kcore, kce->kcore_filename)) |
| 2051 | return -1; |
| 2052 | |
| 2053 | strcpy(kce->extract_filename, PERF_KCORE_EXTRACT); |
| 2054 | if (kcore__init(&extract, kce->extract_filename, kcore.elfclass, true)) |
| 2055 | goto out_kcore_close; |
| 2056 | |
| 2057 | if (kcore__copy_hdr(&kcore, &extract, count)) |
| 2058 | goto out_extract_close; |
| 2059 | |
| 2060 | if (kcore__add_phdr(&extract, idx, offset, kce->addr, kce->len)) |
| 2061 | goto out_extract_close; |
| 2062 | |
| 2063 | sz = kcore__write(&extract); |
| 2064 | if (sz < 0 || sz > offset) |
| 2065 | goto out_extract_close; |
| 2066 | |
| 2067 | if (copy_bytes(kcore.fd, kce->offs, extract.fd, offset, kce->len)) |
| 2068 | goto out_extract_close; |
| 2069 | |
| 2070 | err = 0; |
| 2071 | |
| 2072 | out_extract_close: |
| 2073 | kcore__close(&extract); |
| 2074 | if (err) |
| 2075 | unlink(kce->extract_filename); |
| 2076 | out_kcore_close: |
| 2077 | kcore__close(&kcore); |
| 2078 | |
| 2079 | return err; |
| 2080 | } |
| 2081 | |
| 2082 | void kcore_extract__delete(struct kcore_extract *kce) |
| 2083 | { |
| 2084 | unlink(kce->extract_filename); |
| 2085 | } |
| 2086 | |
Arnaldo Carvalho de Melo | 1c1a3a4 | 2016-07-12 12:19:09 -0300 | [diff] [blame] | 2087 | #ifdef HAVE_GELF_GETNOTE_SUPPORT |
Ravi Bangoria | 5a5e3d3 | 2018-08-20 10:12:50 +0530 | [diff] [blame] | 2088 | |
| 2089 | static void sdt_adjust_loc(struct sdt_note *tmp, GElf_Addr base_off) |
| 2090 | { |
| 2091 | if (!base_off) |
| 2092 | return; |
| 2093 | |
| 2094 | if (tmp->bit32) |
| 2095 | tmp->addr.a32[SDT_NOTE_IDX_LOC] = |
| 2096 | tmp->addr.a32[SDT_NOTE_IDX_LOC] + base_off - |
| 2097 | tmp->addr.a32[SDT_NOTE_IDX_BASE]; |
| 2098 | else |
| 2099 | tmp->addr.a64[SDT_NOTE_IDX_LOC] = |
| 2100 | tmp->addr.a64[SDT_NOTE_IDX_LOC] + base_off - |
| 2101 | tmp->addr.a64[SDT_NOTE_IDX_BASE]; |
| 2102 | } |
| 2103 | |
| 2104 | static void sdt_adjust_refctr(struct sdt_note *tmp, GElf_Addr base_addr, |
| 2105 | GElf_Addr base_off) |
| 2106 | { |
| 2107 | if (!base_off) |
| 2108 | return; |
| 2109 | |
| 2110 | if (tmp->bit32 && tmp->addr.a32[SDT_NOTE_IDX_REFCTR]) |
| 2111 | tmp->addr.a32[SDT_NOTE_IDX_REFCTR] -= (base_addr - base_off); |
| 2112 | else if (tmp->addr.a64[SDT_NOTE_IDX_REFCTR]) |
| 2113 | tmp->addr.a64[SDT_NOTE_IDX_REFCTR] -= (base_addr - base_off); |
| 2114 | } |
| 2115 | |
Hemant Kumar | 060fa0c | 2016-07-01 17:03:46 +0900 | [diff] [blame] | 2116 | /** |
| 2117 | * populate_sdt_note : Parse raw data and identify SDT note |
| 2118 | * @elf: elf of the opened file |
| 2119 | * @data: raw data of a section with description offset applied |
| 2120 | * @len: note description size |
| 2121 | * @type: type of the note |
| 2122 | * @sdt_notes: List to add the SDT note |
| 2123 | * |
| 2124 | * Responsible for parsing the @data in section .note.stapsdt in @elf and |
| 2125 | * if its an SDT note, it appends to @sdt_notes list. |
| 2126 | */ |
| 2127 | static int populate_sdt_note(Elf **elf, const char *data, size_t len, |
| 2128 | struct list_head *sdt_notes) |
| 2129 | { |
Alexis Berlemont | be88184 | 2016-12-14 01:07:31 +0100 | [diff] [blame] | 2130 | const char *provider, *name, *args; |
Hemant Kumar | 060fa0c | 2016-07-01 17:03:46 +0900 | [diff] [blame] | 2131 | struct sdt_note *tmp = NULL; |
| 2132 | GElf_Ehdr ehdr; |
Hemant Kumar | 060fa0c | 2016-07-01 17:03:46 +0900 | [diff] [blame] | 2133 | GElf_Shdr shdr; |
| 2134 | int ret = -EINVAL; |
| 2135 | |
| 2136 | union { |
| 2137 | Elf64_Addr a64[NR_ADDR]; |
| 2138 | Elf32_Addr a32[NR_ADDR]; |
| 2139 | } buf; |
| 2140 | |
| 2141 | Elf_Data dst = { |
| 2142 | .d_buf = &buf, .d_type = ELF_T_ADDR, .d_version = EV_CURRENT, |
| 2143 | .d_size = gelf_fsize((*elf), ELF_T_ADDR, NR_ADDR, EV_CURRENT), |
| 2144 | .d_off = 0, .d_align = 0 |
| 2145 | }; |
| 2146 | Elf_Data src = { |
| 2147 | .d_buf = (void *) data, .d_type = ELF_T_ADDR, |
| 2148 | .d_version = EV_CURRENT, .d_size = dst.d_size, .d_off = 0, |
| 2149 | .d_align = 0 |
| 2150 | }; |
| 2151 | |
| 2152 | tmp = (struct sdt_note *)calloc(1, sizeof(struct sdt_note)); |
| 2153 | if (!tmp) { |
| 2154 | ret = -ENOMEM; |
| 2155 | goto out_err; |
| 2156 | } |
| 2157 | |
| 2158 | INIT_LIST_HEAD(&tmp->note_list); |
| 2159 | |
| 2160 | if (len < dst.d_size + 3) |
| 2161 | goto out_free_note; |
| 2162 | |
| 2163 | /* Translation from file representation to memory representation */ |
| 2164 | if (gelf_xlatetom(*elf, &dst, &src, |
| 2165 | elf_getident(*elf, NULL)[EI_DATA]) == NULL) { |
| 2166 | pr_err("gelf_xlatetom : %s\n", elf_errmsg(-1)); |
| 2167 | goto out_free_note; |
| 2168 | } |
| 2169 | |
| 2170 | /* Populate the fields of sdt_note */ |
| 2171 | provider = data + dst.d_size; |
| 2172 | |
| 2173 | name = (const char *)memchr(provider, '\0', data + len - provider); |
| 2174 | if (name++ == NULL) |
| 2175 | goto out_free_note; |
| 2176 | |
| 2177 | tmp->provider = strdup(provider); |
| 2178 | if (!tmp->provider) { |
| 2179 | ret = -ENOMEM; |
| 2180 | goto out_free_note; |
| 2181 | } |
| 2182 | tmp->name = strdup(name); |
| 2183 | if (!tmp->name) { |
| 2184 | ret = -ENOMEM; |
| 2185 | goto out_free_prov; |
| 2186 | } |
| 2187 | |
Alexis Berlemont | be88184 | 2016-12-14 01:07:31 +0100 | [diff] [blame] | 2188 | args = memchr(name, '\0', data + len - name); |
| 2189 | |
| 2190 | /* |
| 2191 | * There is no argument if: |
| 2192 | * - We reached the end of the note; |
| 2193 | * - There is not enough room to hold a potential string; |
| 2194 | * - The argument string is empty or just contains ':'. |
| 2195 | */ |
| 2196 | if (args == NULL || data + len - args < 2 || |
| 2197 | args[1] == ':' || args[1] == '\0') |
| 2198 | tmp->args = NULL; |
| 2199 | else { |
| 2200 | tmp->args = strdup(++args); |
| 2201 | if (!tmp->args) { |
| 2202 | ret = -ENOMEM; |
| 2203 | goto out_free_name; |
| 2204 | } |
| 2205 | } |
| 2206 | |
Hemant Kumar | 060fa0c | 2016-07-01 17:03:46 +0900 | [diff] [blame] | 2207 | if (gelf_getclass(*elf) == ELFCLASS32) { |
| 2208 | memcpy(&tmp->addr, &buf, 3 * sizeof(Elf32_Addr)); |
| 2209 | tmp->bit32 = true; |
| 2210 | } else { |
| 2211 | memcpy(&tmp->addr, &buf, 3 * sizeof(Elf64_Addr)); |
| 2212 | tmp->bit32 = false; |
| 2213 | } |
| 2214 | |
| 2215 | if (!gelf_getehdr(*elf, &ehdr)) { |
| 2216 | pr_debug("%s : cannot get elf header.\n", __func__); |
| 2217 | ret = -EBADF; |
Alexis Berlemont | be88184 | 2016-12-14 01:07:31 +0100 | [diff] [blame] | 2218 | goto out_free_args; |
Hemant Kumar | 060fa0c | 2016-07-01 17:03:46 +0900 | [diff] [blame] | 2219 | } |
| 2220 | |
| 2221 | /* Adjust the prelink effect : |
| 2222 | * Find out the .stapsdt.base section. |
| 2223 | * This scn will help us to handle prelinking (if present). |
| 2224 | * Compare the retrieved file offset of the base section with the |
| 2225 | * base address in the description of the SDT note. If its different, |
| 2226 | * then accordingly, adjust the note location. |
| 2227 | */ |
Ravi Bangoria | 5a5e3d3 | 2018-08-20 10:12:50 +0530 | [diff] [blame] | 2228 | if (elf_section_by_name(*elf, &ehdr, &shdr, SDT_BASE_SCN, NULL)) |
| 2229 | sdt_adjust_loc(tmp, shdr.sh_offset); |
| 2230 | |
| 2231 | /* Adjust reference counter offset */ |
| 2232 | if (elf_section_by_name(*elf, &ehdr, &shdr, SDT_PROBES_SCN, NULL)) |
| 2233 | sdt_adjust_refctr(tmp, shdr.sh_addr, shdr.sh_offset); |
Hemant Kumar | 060fa0c | 2016-07-01 17:03:46 +0900 | [diff] [blame] | 2234 | |
| 2235 | list_add_tail(&tmp->note_list, sdt_notes); |
| 2236 | return 0; |
| 2237 | |
Alexis Berlemont | be88184 | 2016-12-14 01:07:31 +0100 | [diff] [blame] | 2238 | out_free_args: |
Arnaldo Carvalho de Melo | d8f9da2 | 2019-07-04 12:06:20 -0300 | [diff] [blame] | 2239 | zfree(&tmp->args); |
Hemant Kumar | 060fa0c | 2016-07-01 17:03:46 +0900 | [diff] [blame] | 2240 | out_free_name: |
Arnaldo Carvalho de Melo | d8f9da2 | 2019-07-04 12:06:20 -0300 | [diff] [blame] | 2241 | zfree(&tmp->name); |
Hemant Kumar | 060fa0c | 2016-07-01 17:03:46 +0900 | [diff] [blame] | 2242 | out_free_prov: |
Arnaldo Carvalho de Melo | d8f9da2 | 2019-07-04 12:06:20 -0300 | [diff] [blame] | 2243 | zfree(&tmp->provider); |
Hemant Kumar | 060fa0c | 2016-07-01 17:03:46 +0900 | [diff] [blame] | 2244 | out_free_note: |
| 2245 | free(tmp); |
| 2246 | out_err: |
| 2247 | return ret; |
| 2248 | } |
| 2249 | |
| 2250 | /** |
| 2251 | * construct_sdt_notes_list : constructs a list of SDT notes |
| 2252 | * @elf : elf to look into |
| 2253 | * @sdt_notes : empty list_head |
| 2254 | * |
| 2255 | * Scans the sections in 'elf' for the section |
| 2256 | * .note.stapsdt. It, then calls populate_sdt_note to find |
| 2257 | * out the SDT events and populates the 'sdt_notes'. |
| 2258 | */ |
| 2259 | static int construct_sdt_notes_list(Elf *elf, struct list_head *sdt_notes) |
| 2260 | { |
| 2261 | GElf_Ehdr ehdr; |
| 2262 | Elf_Scn *scn = NULL; |
| 2263 | Elf_Data *data; |
| 2264 | GElf_Shdr shdr; |
| 2265 | size_t shstrndx, next; |
| 2266 | GElf_Nhdr nhdr; |
| 2267 | size_t name_off, desc_off, offset; |
| 2268 | int ret = 0; |
| 2269 | |
| 2270 | if (gelf_getehdr(elf, &ehdr) == NULL) { |
| 2271 | ret = -EBADF; |
| 2272 | goto out_ret; |
| 2273 | } |
| 2274 | if (elf_getshdrstrndx(elf, &shstrndx) != 0) { |
| 2275 | ret = -EBADF; |
| 2276 | goto out_ret; |
| 2277 | } |
| 2278 | |
| 2279 | /* Look for the required section */ |
| 2280 | scn = elf_section_by_name(elf, &ehdr, &shdr, SDT_NOTE_SCN, NULL); |
| 2281 | if (!scn) { |
| 2282 | ret = -ENOENT; |
| 2283 | goto out_ret; |
| 2284 | } |
| 2285 | |
| 2286 | if ((shdr.sh_type != SHT_NOTE) || (shdr.sh_flags & SHF_ALLOC)) { |
| 2287 | ret = -ENOENT; |
| 2288 | goto out_ret; |
| 2289 | } |
| 2290 | |
| 2291 | data = elf_getdata(scn, NULL); |
| 2292 | |
| 2293 | /* Get the SDT notes */ |
| 2294 | for (offset = 0; (next = gelf_getnote(data, offset, &nhdr, &name_off, |
| 2295 | &desc_off)) > 0; offset = next) { |
| 2296 | if (nhdr.n_namesz == sizeof(SDT_NOTE_NAME) && |
| 2297 | !memcmp(data->d_buf + name_off, SDT_NOTE_NAME, |
| 2298 | sizeof(SDT_NOTE_NAME))) { |
| 2299 | /* Check the type of the note */ |
| 2300 | if (nhdr.n_type != SDT_NOTE_TYPE) |
| 2301 | goto out_ret; |
| 2302 | |
| 2303 | ret = populate_sdt_note(&elf, ((data->d_buf) + desc_off), |
| 2304 | nhdr.n_descsz, sdt_notes); |
| 2305 | if (ret < 0) |
| 2306 | goto out_ret; |
| 2307 | } |
| 2308 | } |
| 2309 | if (list_empty(sdt_notes)) |
| 2310 | ret = -ENOENT; |
| 2311 | |
| 2312 | out_ret: |
| 2313 | return ret; |
| 2314 | } |
| 2315 | |
| 2316 | /** |
| 2317 | * get_sdt_note_list : Wrapper to construct a list of sdt notes |
| 2318 | * @head : empty list_head |
| 2319 | * @target : file to find SDT notes from |
| 2320 | * |
| 2321 | * This opens the file, initializes |
| 2322 | * the ELF and then calls construct_sdt_notes_list. |
| 2323 | */ |
| 2324 | int get_sdt_note_list(struct list_head *head, const char *target) |
| 2325 | { |
| 2326 | Elf *elf; |
| 2327 | int fd, ret; |
| 2328 | |
| 2329 | fd = open(target, O_RDONLY); |
| 2330 | if (fd < 0) |
| 2331 | return -EBADF; |
| 2332 | |
| 2333 | elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); |
| 2334 | if (!elf) { |
| 2335 | ret = -EBADF; |
| 2336 | goto out_close; |
| 2337 | } |
| 2338 | ret = construct_sdt_notes_list(elf, head); |
| 2339 | elf_end(elf); |
| 2340 | out_close: |
| 2341 | close(fd); |
| 2342 | return ret; |
| 2343 | } |
| 2344 | |
| 2345 | /** |
| 2346 | * cleanup_sdt_note_list : free the sdt notes' list |
| 2347 | * @sdt_notes: sdt notes' list |
| 2348 | * |
| 2349 | * Free up the SDT notes in @sdt_notes. |
| 2350 | * Returns the number of SDT notes free'd. |
| 2351 | */ |
| 2352 | int cleanup_sdt_note_list(struct list_head *sdt_notes) |
| 2353 | { |
| 2354 | struct sdt_note *tmp, *pos; |
| 2355 | int nr_free = 0; |
| 2356 | |
| 2357 | list_for_each_entry_safe(pos, tmp, sdt_notes, note_list) { |
Arnaldo Carvalho de Melo | e56fbc9 | 2019-07-04 12:13:46 -0300 | [diff] [blame] | 2358 | list_del_init(&pos->note_list); |
Arnaldo Carvalho de Melo | d8f9da2 | 2019-07-04 12:06:20 -0300 | [diff] [blame] | 2359 | zfree(&pos->name); |
| 2360 | zfree(&pos->provider); |
Hemant Kumar | 060fa0c | 2016-07-01 17:03:46 +0900 | [diff] [blame] | 2361 | free(pos); |
| 2362 | nr_free++; |
| 2363 | } |
| 2364 | return nr_free; |
| 2365 | } |
| 2366 | |
| 2367 | /** |
| 2368 | * sdt_notes__get_count: Counts the number of sdt events |
| 2369 | * @start: list_head to sdt_notes list |
| 2370 | * |
| 2371 | * Returns the number of SDT notes in a list |
| 2372 | */ |
| 2373 | int sdt_notes__get_count(struct list_head *start) |
| 2374 | { |
| 2375 | struct sdt_note *sdt_ptr; |
| 2376 | int count = 0; |
| 2377 | |
| 2378 | list_for_each_entry(sdt_ptr, start, note_list) |
| 2379 | count++; |
| 2380 | return count; |
| 2381 | } |
Arnaldo Carvalho de Melo | 1c1a3a4 | 2016-07-12 12:19:09 -0300 | [diff] [blame] | 2382 | #endif |
Hemant Kumar | 060fa0c | 2016-07-01 17:03:46 +0900 | [diff] [blame] | 2383 | |
Namhyung Kim | e5a1845 | 2012-08-06 13:41:20 +0900 | [diff] [blame] | 2384 | void symbol__elf_init(void) |
| 2385 | { |
| 2386 | elf_version(EV_CURRENT); |
| 2387 | } |