--- /dev/null
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <inttypes.h>
+
+#include "symbol.h"
+#include "machine.h"
+#include "vdso.h"
+#include <symbol/kallsyms.h>
+#include "debug.h"
+
+#ifndef EM_AARCH64
+#define EM_AARCH64 183 /* ARM 64 bit */
+#endif
+
+
+#ifdef HAVE_CPLUS_DEMANGLE_SUPPORT
+extern char *cplus_demangle(const char *, int);
+
+static inline char *bfd_demangle(void __maybe_unused *v, const char *c, int i)
+{
+ return cplus_demangle(c, i);
+}
+#else
+#ifdef NO_DEMANGLE
+static inline char *bfd_demangle(void __maybe_unused *v,
+ const char __maybe_unused *c,
+ int __maybe_unused i)
+{
+ return NULL;
+}
+#else
+#define PACKAGE 'perf'
+#include <bfd.h>
+#endif
+#endif
+
+#ifndef HAVE_ELF_GETPHDRNUM_SUPPORT
+static int elf_getphdrnum(Elf *elf, size_t *dst)
+{
+ GElf_Ehdr gehdr;
+ GElf_Ehdr *ehdr;
+
+ ehdr = gelf_getehdr(elf, &gehdr);
+ if (!ehdr)
+ return -1;
+
+ *dst = ehdr->e_phnum;
+
+ return 0;
+}
+#endif
+
+#ifndef NT_GNU_BUILD_ID
+#define NT_GNU_BUILD_ID 3
+#endif
+
+/**
+ * elf_symtab__for_each_symbol - iterate thru all the symbols
+ *
+ * @syms: struct elf_symtab instance to iterate
+ * @idx: uint32_t idx
+ * @sym: GElf_Sym iterator
+ */
+#define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
+ for (idx = 0, gelf_getsym(syms, idx, &sym);\
+ idx < nr_syms; \
+ idx++, gelf_getsym(syms, idx, &sym))
+
+static inline uint8_t elf_sym__type(const GElf_Sym *sym)
+{
+ return GELF_ST_TYPE(sym->st_info);
+}
+
+#ifndef STT_GNU_IFUNC
+#define STT_GNU_IFUNC 10
+#endif
+
+static inline int elf_sym__is_function(const GElf_Sym *sym)
+{
+ return (elf_sym__type(sym) == STT_FUNC ||
+ elf_sym__type(sym) == STT_GNU_IFUNC) &&
+ sym->st_name != 0 &&
+ sym->st_shndx != SHN_UNDEF;
+}
+
+static inline bool elf_sym__is_object(const GElf_Sym *sym)
+{
+ return elf_sym__type(sym) == STT_OBJECT &&
+ sym->st_name != 0 &&
+ sym->st_shndx != SHN_UNDEF;
+}
+
+static inline int elf_sym__is_label(const GElf_Sym *sym)
+{
+ return elf_sym__type(sym) == STT_NOTYPE &&
+ sym->st_name != 0 &&
+ sym->st_shndx != SHN_UNDEF &&
+ sym->st_shndx != SHN_ABS;
+}
+
+static bool elf_sym__is_a(GElf_Sym *sym, enum map_type type)
+{
+ switch (type) {
+ case MAP__FUNCTION:
+ return elf_sym__is_function(sym);
+ case MAP__VARIABLE:
+ return elf_sym__is_object(sym);
+ default:
+ return false;
+ }
+}
+
+static inline const char *elf_sym__name(const GElf_Sym *sym,
+ const Elf_Data *symstrs)
+{
+ return symstrs->d_buf + sym->st_name;
+}
+
+static inline const char *elf_sec__name(const GElf_Shdr *shdr,
+ const Elf_Data *secstrs)
+{
+ return secstrs->d_buf + shdr->sh_name;
+}
+
+static inline int elf_sec__is_text(const GElf_Shdr *shdr,
+ const Elf_Data *secstrs)
+{
+ return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
+}
+
+static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
+ const Elf_Data *secstrs)
+{
+ return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
+}
+
+static bool elf_sec__is_a(GElf_Shdr *shdr, Elf_Data *secstrs,
+ enum map_type type)
+{
+ switch (type) {
+ case MAP__FUNCTION:
+ return elf_sec__is_text(shdr, secstrs);
+ case MAP__VARIABLE:
+ return elf_sec__is_data(shdr, secstrs);
+ default:
+ return false;
+ }
+}
+
+static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
+{
+ Elf_Scn *sec = NULL;
+ GElf_Shdr shdr;
+ size_t cnt = 1;
+
+ while ((sec = elf_nextscn(elf, sec)) != NULL) {
+ gelf_getshdr(sec, &shdr);
+
+ if ((addr >= shdr.sh_addr) &&
+ (addr < (shdr.sh_addr + shdr.sh_size)))
+ return cnt;
+
+ ++cnt;
+ }
+
+ return -1;
+}
+
+Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
+ GElf_Shdr *shp, const char *name, size_t *idx)
+{
+ Elf_Scn *sec = NULL;
+ size_t cnt = 1;
+
+ /* Elf is corrupted/truncated, avoid calling elf_strptr. */
+ if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL))
+ return NULL;
+
+ while ((sec = elf_nextscn(elf, sec)) != NULL) {
+ char *str;
+
+ gelf_getshdr(sec, shp);
+ str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
+ if (str && !strcmp(name, str)) {
+ if (idx)
+ *idx = cnt;
+ return sec;
+ }
+ ++cnt;
+ }
+
+ return NULL;
+}
+
+#define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
+ for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
+ idx < nr_entries; \
+ ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
+
+#define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
+ for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
+ idx < nr_entries; \
+ ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
+
+/*
+ * We need to check if we have a .dynsym, so that we can handle the
+ * .plt, synthesizing its symbols, that aren't on the symtabs (be it
+ * .dynsym or .symtab).
+ * And always look at the original dso, not at debuginfo packages, that
+ * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
+ */
+int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss, struct map *map,
+ symbol_filter_t filter)
+{
+ uint32_t nr_rel_entries, idx;
+ GElf_Sym sym;
+ u64 plt_offset;
+ GElf_Shdr shdr_plt;
+ struct symbol *f;
+ GElf_Shdr shdr_rel_plt, shdr_dynsym;
+ Elf_Data *reldata, *syms, *symstrs;
+ Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
+ size_t dynsym_idx;
+ GElf_Ehdr ehdr;
+ char sympltname[1024];
+ Elf *elf;
+ int nr = 0, symidx, err = 0;
+
+ if (!ss->dynsym)
+ return 0;
+
+ elf = ss->elf;
+ ehdr = ss->ehdr;
+
+ scn_dynsym = ss->dynsym;
+ shdr_dynsym = ss->dynshdr;
+ dynsym_idx = ss->dynsym_idx;
+
+ if (scn_dynsym == NULL)
+ goto out_elf_end;
+
+ scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
+ ".rela.plt", NULL);
+ if (scn_plt_rel == NULL) {
+ scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
+ ".rel.plt", NULL);
+ if (scn_plt_rel == NULL)
+ goto out_elf_end;
+ }
+
+ err = -1;
+
+ if (shdr_rel_plt.sh_link != dynsym_idx)
+ goto out_elf_end;
+
+ if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
+ goto out_elf_end;
+
+ /*
+ * Fetch the relocation section to find the idxes to the GOT
+ * and the symbols in the .dynsym they refer to.
+ */
+ reldata = elf_getdata(scn_plt_rel, NULL);
+ if (reldata == NULL)
+ goto out_elf_end;
+
+ syms = elf_getdata(scn_dynsym, NULL);
+ if (syms == NULL)
+ goto out_elf_end;
+
+ scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
+ if (scn_symstrs == NULL)
+ goto out_elf_end;
+
+ symstrs = elf_getdata(scn_symstrs, NULL);
+ if (symstrs == NULL)
+ goto out_elf_end;
+
+ if (symstrs->d_size == 0)
+ goto out_elf_end;
+
+ nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
+ plt_offset = shdr_plt.sh_offset;
+
+ if (shdr_rel_plt.sh_type == SHT_RELA) {
+ GElf_Rela pos_mem, *pos;
+
+ elf_section__for_each_rela(reldata, pos, pos_mem, idx,
+ nr_rel_entries) {
+ symidx = GELF_R_SYM(pos->r_info);
+ plt_offset += shdr_plt.sh_entsize;
+ gelf_getsym(syms, symidx, &sym);
+ snprintf(sympltname, sizeof(sympltname),
+ "%s@plt", elf_sym__name(&sym, symstrs));
+
+ f = symbol__new(plt_offset, shdr_plt.sh_entsize,
+ STB_GLOBAL, sympltname);
+ if (!f)
+ goto out_elf_end;
+
+ if (filter && filter(map, f))
+ symbol__delete(f);
+ else {
+ symbols__insert(&dso->symbols[map->type], f);
+ ++nr;
+ }
+ }
+ } else if (shdr_rel_plt.sh_type == SHT_REL) {
+ GElf_Rel pos_mem, *pos;
+ elf_section__for_each_rel(reldata, pos, pos_mem, idx,
+ nr_rel_entries) {
+ symidx = GELF_R_SYM(pos->r_info);
+ plt_offset += shdr_plt.sh_entsize;
+ gelf_getsym(syms, symidx, &sym);
+ snprintf(sympltname, sizeof(sympltname),
+ "%s@plt", elf_sym__name(&sym, symstrs));
+
+ f = symbol__new(plt_offset, shdr_plt.sh_entsize,
+ STB_GLOBAL, sympltname);
+ if (!f)
+ goto out_elf_end;
+
+ if (filter && filter(map, f))
+ symbol__delete(f);
+ else {
+ symbols__insert(&dso->symbols[map->type], f);
+ ++nr;
+ }
+ }
+ }
+
+ err = 0;
+out_elf_end:
+ if (err == 0)
+ return nr;
+ pr_debug("%s: problems reading %s PLT info.\n",
+ __func__, dso->long_name);
+ return 0;
+}
+
+/*
+ * Align offset to 4 bytes as needed for note name and descriptor data.
+ */
+#define NOTE_ALIGN(n) (((n) + 3) & -4U)
+
+static int elf_read_build_id(Elf *elf, void *bf, size_t size)
+{
+ int err = -1;
+ GElf_Ehdr ehdr;
+ GElf_Shdr shdr;
+ Elf_Data *data;
+ Elf_Scn *sec;
+ Elf_Kind ek;
+ void *ptr;
+
+ if (size < BUILD_ID_SIZE)
+ goto out;
+
+ ek = elf_kind(elf);
+ if (ek != ELF_K_ELF)
+ goto out;
+
+ if (gelf_getehdr(elf, &ehdr) == NULL) {
+ pr_err("%s: cannot get elf header.\n", __func__);
+ goto out;
+ }
+
+ /*
+ * Check following sections for notes:
+ * '.note.gnu.build-id'
+ * '.notes'
+ * '.note' (VDSO specific)
+ */
+ do {
+ sec = elf_section_by_name(elf, &ehdr, &shdr,
+ ".note.gnu.build-id", NULL);
+ if (sec)
+ break;
+
+ sec = elf_section_by_name(elf, &ehdr, &shdr,
+ ".notes", NULL);
+ if (sec)
+ break;
+
+ sec = elf_section_by_name(elf, &ehdr, &shdr,
+ ".note", NULL);
+ if (sec)
+ break;
+
+ return err;
+
+ } while (0);
+
+ data = elf_getdata(sec, NULL);
+ if (data == NULL)
+ goto out;
+
+ ptr = data->d_buf;
+ while (ptr < (data->d_buf + data->d_size)) {
+ GElf_Nhdr *nhdr = ptr;
+ size_t namesz = NOTE_ALIGN(nhdr->n_namesz),
+ descsz = NOTE_ALIGN(nhdr->n_descsz);
+ const char *name;
+
+ ptr += sizeof(*nhdr);
+ name = ptr;
+ ptr += namesz;
+ if (nhdr->n_type == NT_GNU_BUILD_ID &&
+ nhdr->n_namesz == sizeof("GNU")) {
+ if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
+ size_t sz = min(size, descsz);
+ memcpy(bf, ptr, sz);
+ memset(bf + sz, 0, size - sz);
+ err = descsz;
+ break;
+ }
+ }
+ ptr += descsz;
+ }
+
+out:
+ return err;
+}
+
+int filename__read_build_id(const char *filename, void *bf, size_t size)
+{
+ int fd, err = -1;
+ Elf *elf;
+
+ if (size < BUILD_ID_SIZE)
+ goto out;
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ goto out;
+
+ elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
+ if (elf == NULL) {
+ pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
+ goto out_close;
+ }
+
+ err = elf_read_build_id(elf, bf, size);
+
+ elf_end(elf);
+out_close:
+ close(fd);
+out:
+ return err;
+}
+
+int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
+{
+ int fd, err = -1;
+
+ if (size < BUILD_ID_SIZE)
+ goto out;
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ goto out;
+
+ while (1) {
+ char bf[BUFSIZ];
+ GElf_Nhdr nhdr;
+ size_t namesz, descsz;
+
+ if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
+ break;
+
+ namesz = NOTE_ALIGN(nhdr.n_namesz);
+ descsz = NOTE_ALIGN(nhdr.n_descsz);
+ if (nhdr.n_type == NT_GNU_BUILD_ID &&
+ nhdr.n_namesz == sizeof("GNU")) {
+ if (read(fd, bf, namesz) != (ssize_t)namesz)
+ break;
+ if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
+ size_t sz = min(descsz, size);
+ if (read(fd, build_id, sz) == (ssize_t)sz) {
+ memset(build_id + sz, 0, size - sz);
+ err = 0;
+ break;
+ }
+ } else if (read(fd, bf, descsz) != (ssize_t)descsz)
+ break;
+ } else {
+ int n = namesz + descsz;
+ if (read(fd, bf, n) != n)
+ break;
+ }
+ }
+ close(fd);
+out:
+ return err;
+}
+
+int filename__read_debuglink(const char *filename, char *debuglink,
+ size_t size)
+{
+ int fd, err = -1;
+ Elf *elf;
+ GElf_Ehdr ehdr;
+ GElf_Shdr shdr;
+ Elf_Data *data;
+ Elf_Scn *sec;
+ Elf_Kind ek;
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ goto out;
+
+ elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
+ if (elf == NULL) {
+ pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
+ goto out_close;
+ }
+
+ ek = elf_kind(elf);
+ if (ek != ELF_K_ELF)
+ goto out_elf_end;
+
+ if (gelf_getehdr(elf, &ehdr) == NULL) {
+ pr_err("%s: cannot get elf header.\n", __func__);
+ goto out_elf_end;
+ }
+
+ sec = elf_section_by_name(elf, &ehdr, &shdr,
+ ".gnu_debuglink", NULL);
+ if (sec == NULL)
+ goto out_elf_end;
+
+ data = elf_getdata(sec, NULL);
+ if (data == NULL)
+ goto out_elf_end;
+
+ /* the start of this section is a zero-terminated string */
+ strncpy(debuglink, data->d_buf, size);
+
+ err = 0;
+
+out_elf_end:
+ elf_end(elf);
+out_close:
+ close(fd);
+out:
+ return err;
+}
+
+static int dso__swap_init(struct dso *dso, unsigned char eidata)
+{
+ static unsigned int const endian = 1;
+
+ dso->needs_swap = DSO_SWAP__NO;
+
+ switch (eidata) {
+ case ELFDATA2LSB:
+ /* We are big endian, DSO is little endian. */
+ if (*(unsigned char const *)&endian != 1)
+ dso->needs_swap = DSO_SWAP__YES;
+ break;
+
+ case ELFDATA2MSB:
+ /* We are little endian, DSO is big endian. */
+ if (*(unsigned char const *)&endian != 0)
+ dso->needs_swap = DSO_SWAP__YES;
+ break;
+
+ default:
+ pr_err("unrecognized DSO data encoding %d\n", eidata);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int decompress_kmodule(struct dso *dso, const char *name,
+ enum dso_binary_type type)
+{
+ int fd = -1;
+ char tmpbuf[] = "/tmp/perf-kmod-XXXXXX";
+ struct kmod_path m;
+
+ if (type != DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP &&
+ type != DSO_BINARY_TYPE__GUEST_KMODULE_COMP &&
+ type != DSO_BINARY_TYPE__BUILD_ID_CACHE)
+ return -1;
+
+ if (type == DSO_BINARY_TYPE__BUILD_ID_CACHE)
+ name = dso->long_name;
+
+ if (kmod_path__parse_ext(&m, name) || !m.comp)
+ return -1;
+
+ fd = mkstemp(tmpbuf);
+ if (fd < 0) {
+ dso->load_errno = errno;
+ goto out;
+ }
+
+ if (!decompress_to_file(m.ext, name, fd)) {
+ dso->load_errno = DSO_LOAD_ERRNO__DECOMPRESSION_FAILURE;
+ close(fd);
+ fd = -1;
+ }
+
+ unlink(tmpbuf);
+
+out:
+ free(m.ext);
+ return fd;
+}
+
+bool symsrc__possibly_runtime(struct symsrc *ss)
+{
+ return ss->dynsym || ss->opdsec;
+}
+
+bool symsrc__has_symtab(struct symsrc *ss)
+{
+ return ss->symtab != NULL;
+}
+
+void symsrc__destroy(struct symsrc *ss)
+{
+ zfree(&ss->name);
+ elf_end(ss->elf);
+ close(ss->fd);
+}
+
+int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
+ enum dso_binary_type type)
+{
+ int err = -1;
+ GElf_Ehdr ehdr;
+ Elf *elf;
+ int fd;
+
+ if (dso__needs_decompress(dso)) {
+ fd = decompress_kmodule(dso, name, type);
+ if (fd < 0)
+ return -1;
+ } else {
+ fd = open(name, O_RDONLY);
+ if (fd < 0) {
+ dso->load_errno = errno;
+ return -1;
+ }
+ }
+
+ elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
+ if (elf == NULL) {
+ pr_debug("%s: cannot read %s ELF file.\n", __func__, name);
+ dso->load_errno = DSO_LOAD_ERRNO__INVALID_ELF;
+ goto out_close;
+ }
+
+ if (gelf_getehdr(elf, &ehdr) == NULL) {
+ dso->load_errno = DSO_LOAD_ERRNO__INVALID_ELF;
+ pr_debug("%s: cannot get elf header.\n", __func__);
+ goto out_elf_end;
+ }
+
+ if (dso__swap_init(dso, ehdr.e_ident[EI_DATA])) {
+ dso->load_errno = DSO_LOAD_ERRNO__INTERNAL_ERROR;
+ goto out_elf_end;
+ }
+
+ /* Always reject images with a mismatched build-id: */
+ if (dso->has_build_id) {
+ u8 build_id[BUILD_ID_SIZE];
+
+ if (elf_read_build_id(elf, build_id, BUILD_ID_SIZE) < 0) {
+ dso->load_errno = DSO_LOAD_ERRNO__CANNOT_READ_BUILDID;
+ goto out_elf_end;
+ }
+
+ if (!dso__build_id_equal(dso, build_id)) {
+ dso->load_errno = DSO_LOAD_ERRNO__MISMATCHING_BUILDID;
+ goto out_elf_end;
+ }
+ }
+
+ ss->is_64_bit = (gelf_getclass(elf) == ELFCLASS64);
+
+ ss->symtab = elf_section_by_name(elf, &ehdr, &ss->symshdr, ".symtab",
+ NULL);
+ if (ss->symshdr.sh_type != SHT_SYMTAB)
+ ss->symtab = NULL;
+
+ ss->dynsym_idx = 0;
+ ss->dynsym = elf_section_by_name(elf, &ehdr, &ss->dynshdr, ".dynsym",
+ &ss->dynsym_idx);
+ if (ss->dynshdr.sh_type != SHT_DYNSYM)
+ ss->dynsym = NULL;
+
+ ss->opdidx = 0;
+ ss->opdsec = elf_section_by_name(elf, &ehdr, &ss->opdshdr, ".opd",
+ &ss->opdidx);
+ if (ss->opdshdr.sh_type != SHT_PROGBITS)
+ ss->opdsec = NULL;
+
+ if (dso->kernel == DSO_TYPE_USER) {
+ GElf_Shdr shdr;
+ ss->adjust_symbols = (ehdr.e_type == ET_EXEC ||
+ ehdr.e_type == ET_REL ||
+ dso__is_vdso(dso) ||
+ elf_section_by_name(elf, &ehdr, &shdr,
+ ".gnu.prelink_undo",
+ NULL) != NULL);
+ } else {
+ ss->adjust_symbols = ehdr.e_type == ET_EXEC ||
+ ehdr.e_type == ET_REL;
+ }
+
+ ss->name = strdup(name);
+ if (!ss->name) {
+ dso->load_errno = errno;
+ goto out_elf_end;
+ }
+
+ ss->elf = elf;
+ ss->fd = fd;
+ ss->ehdr = ehdr;
+ ss->type = type;
+
+ return 0;
+
+out_elf_end:
+ elf_end(elf);
+out_close:
+ close(fd);
+ return err;
+}
+
+/**
+ * ref_reloc_sym_not_found - has kernel relocation symbol been found.
+ * @kmap: kernel maps and relocation reference symbol
+ *
+ * This function returns %true if we are dealing with the kernel maps and the
+ * relocation reference symbol has not yet been found. Otherwise %false is
+ * returned.
+ */
+static bool ref_reloc_sym_not_found(struct kmap *kmap)
+{
+ return kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name &&
+ !kmap->ref_reloc_sym->unrelocated_addr;
+}
+
+/**
+ * ref_reloc - kernel relocation offset.
+ * @kmap: kernel maps and relocation reference symbol
+ *
+ * This function returns the offset of kernel addresses as determined by using
+ * the relocation reference symbol i.e. if the kernel has not been relocated
+ * then the return value is zero.
+ */
+static u64 ref_reloc(struct kmap *kmap)
+{
+ if (kmap && kmap->ref_reloc_sym &&
+ kmap->ref_reloc_sym->unrelocated_addr)
+ return kmap->ref_reloc_sym->addr -
+ kmap->ref_reloc_sym->unrelocated_addr;
+ return 0;
+}
+
+static bool want_demangle(bool is_kernel_sym)
+{
+ return is_kernel_sym ? symbol_conf.demangle_kernel : symbol_conf.demangle;
+}
+
+int dso__load_sym(struct dso *dso, struct map *map,
+ struct symsrc *syms_ss, struct symsrc *runtime_ss,
+ symbol_filter_t filter, int kmodule)
+{
+ struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL;
+ struct map_groups *kmaps = kmap ? map__kmaps(map) : NULL;
+ struct map *curr_map = map;
+ struct dso *curr_dso = dso;
+ Elf_Data *symstrs, *secstrs;
+ uint32_t nr_syms;
+ int err = -1;
+ uint32_t idx;
+ GElf_Ehdr ehdr;
+ GElf_Shdr shdr;
+ Elf_Data *syms, *opddata = NULL;
+ GElf_Sym sym;
+ Elf_Scn *sec, *sec_strndx;
+ Elf *elf;
+ int nr = 0;
+ bool remap_kernel = false, adjust_kernel_syms = false;
+
+ if (kmap && !kmaps)
+ return -1;
+
+ dso->symtab_type = syms_ss->type;
+ dso->is_64_bit = syms_ss->is_64_bit;
+ dso->rel = syms_ss->ehdr.e_type == ET_REL;
+
+ /*
+ * Modules may already have symbols from kallsyms, but those symbols
+ * have the wrong values for the dso maps, so remove them.
+ */
+ if (kmodule && syms_ss->symtab)
+ symbols__delete(&dso->symbols[map->type]);
+
+ if (!syms_ss->symtab) {
+ /*
+ * If the vmlinux is stripped, fail so we will fall back
+ * to using kallsyms. The vmlinux runtime symbols aren't
+ * of much use.
+ */
+ if (dso->kernel)
+ goto out_elf_end;
+
+ syms_ss->symtab = syms_ss->dynsym;
+ syms_ss->symshdr = syms_ss->dynshdr;
+ }
+
+ elf = syms_ss->elf;
+ ehdr = syms_ss->ehdr;
+ sec = syms_ss->symtab;
+ shdr = syms_ss->symshdr;
+
+ if (runtime_ss->opdsec)
+ opddata = elf_rawdata(runtime_ss->opdsec, NULL);
+
+ syms = elf_getdata(sec, NULL);
+ if (syms == NULL)
+ goto out_elf_end;
+
+ sec = elf_getscn(elf, shdr.sh_link);
+ if (sec == NULL)
+ goto out_elf_end;
+
+ symstrs = elf_getdata(sec, NULL);
+ if (symstrs == NULL)
+ goto out_elf_end;
+
+ sec_strndx = elf_getscn(runtime_ss->elf, runtime_ss->ehdr.e_shstrndx);
+ if (sec_strndx == NULL)
+ goto out_elf_end;
+
+ secstrs = elf_getdata(sec_strndx, NULL);
+ if (secstrs == NULL)
+ goto out_elf_end;
+
+ nr_syms = shdr.sh_size / shdr.sh_entsize;
+
+ memset(&sym, 0, sizeof(sym));
+
+ /*
+ * The kernel relocation symbol is needed in advance in order to adjust
+ * kernel maps correctly.
+ */
+ if (ref_reloc_sym_not_found(kmap)) {
+ elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
+ const char *elf_name = elf_sym__name(&sym, symstrs);
+
+ if (strcmp(elf_name, kmap->ref_reloc_sym->name))
+ continue;
+ kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
+ map->reloc = kmap->ref_reloc_sym->addr -
+ kmap->ref_reloc_sym->unrelocated_addr;
+ break;
+ }
+ }
+
+ dso->adjust_symbols = runtime_ss->adjust_symbols || ref_reloc(kmap);
+ /*
+ * Initial kernel and module mappings do not map to the dso. For
+ * function mappings, flag the fixups.
+ */
+ if (map->type == MAP__FUNCTION && (dso->kernel || kmodule)) {
+ remap_kernel = true;
+ adjust_kernel_syms = dso->adjust_symbols;
+ }
+ elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
+ struct symbol *f;
+ const char *elf_name = elf_sym__name(&sym, symstrs);
+ char *demangled = NULL;
+ int is_label = elf_sym__is_label(&sym);
+ const char *section_name;
+ bool used_opd = false;
+
+ if (!is_label && !elf_sym__is_a(&sym, map->type))
+ continue;
+
+ /* Reject ARM ELF "mapping symbols": these aren't unique and
+ * don't identify functions, so will confuse the profile
+ * output: */
+ if (ehdr.e_machine == EM_ARM || ehdr.e_machine == EM_AARCH64) {
+ if (elf_name[0] == '$' && strchr("adtx", elf_name[1])
+ && (elf_name[2] == '\0' || elf_name[2] == '.'))
+ continue;
+ }
+
+ if (runtime_ss->opdsec && sym.st_shndx == runtime_ss->opdidx) {
+ u32 offset = sym.st_value - syms_ss->opdshdr.sh_addr;
+ u64 *opd = opddata->d_buf + offset;
+ sym.st_value = DSO__SWAP(dso, u64, *opd);
+ sym.st_shndx = elf_addr_to_index(runtime_ss->elf,
+ sym.st_value);
+ used_opd = true;
+ }
+ /*
+ * When loading symbols in a data mapping, ABS symbols (which
+ * has a value of SHN_ABS in its st_shndx) failed at
+ * elf_getscn(). And it marks the loading as a failure so
+ * already loaded symbols cannot be fixed up.
+ *
+ * I'm not sure what should be done. Just ignore them for now.
+ * - Namhyung Kim
+ */
+ if (sym.st_shndx == SHN_ABS)
+ continue;
+
+ sec = elf_getscn(runtime_ss->elf, sym.st_shndx);
+ if (!sec)
+ goto out_elf_end;
+
+ gelf_getshdr(sec, &shdr);
+
+ if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
+ continue;
+
+ section_name = elf_sec__name(&shdr, secstrs);
+
+ /* On ARM, symbols for thumb functions have 1 added to
+ * the symbol address as a flag - remove it */
+ if ((ehdr.e_machine == EM_ARM) &&
+ (map->type == MAP__FUNCTION) &&
+ (sym.st_value & 1))
+ --sym.st_value;
+
+ if (dso->kernel || kmodule) {
+ char dso_name[PATH_MAX];
+
+ /* Adjust symbol to map to file offset */
+ if (adjust_kernel_syms)
+ sym.st_value -= shdr.sh_addr - shdr.sh_offset;
+
+ if (strcmp(section_name,
+ (curr_dso->short_name +
+ dso->short_name_len)) == 0)
+ goto new_symbol;
+
+ if (strcmp(section_name, ".text") == 0) {
+ /*
+ * The initial kernel mapping is based on
+ * kallsyms and identity maps. Overwrite it to
+ * map to the kernel dso.
+ */
+ if (remap_kernel && dso->kernel) {
+ remap_kernel = false;
+ map->start = shdr.sh_addr +
+ ref_reloc(kmap);
+ map->end = map->start + shdr.sh_size;
+ map->pgoff = shdr.sh_offset;
+ map->map_ip = map__map_ip;
+ map->unmap_ip = map__unmap_ip;
+ /* Ensure maps are correctly ordered */
+ if (kmaps) {
+ map_groups__remove(kmaps, map);
+ map_groups__insert(kmaps, map);
+ }
+ }
+
+ /*
+ * The initial module mapping is based on
+ * /proc/modules mapped to offset zero.
+ * Overwrite it to map to the module dso.
+ */
+ if (remap_kernel && kmodule) {
+ remap_kernel = false;
+ map->pgoff = shdr.sh_offset;
+ }
+
+ curr_map = map;
+ curr_dso = dso;
+ goto new_symbol;
+ }
+
+ if (!kmap)
+ goto new_symbol;
+
+ snprintf(dso_name, sizeof(dso_name),
+ "%s%s", dso->short_name, section_name);
+
+ curr_map = map_groups__find_by_name(kmaps, map->type, dso_name);
+ if (curr_map == NULL) {
+ u64 start = sym.st_value;
+
+ if (kmodule)
+ start += map->start + shdr.sh_offset;
+
+ curr_dso = dso__new(dso_name);
+ if (curr_dso == NULL)
+ goto out_elf_end;
+ curr_dso->kernel = dso->kernel;
+ curr_dso->long_name = dso->long_name;
+ curr_dso->long_name_len = dso->long_name_len;
+ curr_map = map__new2(start, curr_dso,
+ map->type);
+ if (curr_map == NULL) {
+ dso__delete(curr_dso);
+ goto out_elf_end;
+ }
+ if (adjust_kernel_syms) {
+ curr_map->start = shdr.sh_addr +
+ ref_reloc(kmap);
+ curr_map->end = curr_map->start +
+ shdr.sh_size;
+ curr_map->pgoff = shdr.sh_offset;
+ } else {
+ curr_map->map_ip = identity__map_ip;
+ curr_map->unmap_ip = identity__map_ip;
+ }
+ curr_dso->symtab_type = dso->symtab_type;
+ map_groups__insert(kmaps, curr_map);
+ /*
+ * The new DSO should go to the kernel DSOS
+ */
+ dsos__add(&map->groups->machine->kernel_dsos,
+ curr_dso);
+ dso__set_loaded(curr_dso, map->type);
+ } else
+ curr_dso = curr_map->dso;
+
+ goto new_symbol;
+ }
+
+ if ((used_opd && runtime_ss->adjust_symbols)
+ || (!used_opd && syms_ss->adjust_symbols)) {
+ pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " "
+ "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__,
+ (u64)sym.st_value, (u64)shdr.sh_addr,
+ (u64)shdr.sh_offset);
+ sym.st_value -= shdr.sh_addr - shdr.sh_offset;
+ }
+new_symbol:
+ /*
+ * We need to figure out if the object was created from C++ sources
+ * DWARF DW_compile_unit has this, but we don't always have access
+ * to it...
+ */
+ if (want_demangle(dso->kernel || kmodule)) {
+ int demangle_flags = DMGL_NO_OPTS;
+ if (verbose)
+ demangle_flags = DMGL_PARAMS | DMGL_ANSI;
+
+ demangled = bfd_demangle(NULL, elf_name, demangle_flags);
+ if (demangled != NULL)
+ elf_name = demangled;
+ }
+ f = symbol__new(sym.st_value, sym.st_size,
+ GELF_ST_BIND(sym.st_info), elf_name);
+ free(demangled);
+ if (!f)
+ goto out_elf_end;
+
+ if (filter && filter(curr_map, f))
+ symbol__delete(f);
+ else {
+ symbols__insert(&curr_dso->symbols[curr_map->type], f);
+ nr++;
+ }
+ }
+
+ /*
+ * For misannotated, zeroed, ASM function sizes.
+ */
+ if (nr > 0) {
+ if (!symbol_conf.allow_aliases)
+ symbols__fixup_duplicate(&dso->symbols[map->type]);
+ symbols__fixup_end(&dso->symbols[map->type]);
+ if (kmap) {
+ /*
+ * We need to fixup this here too because we create new
+ * maps here, for things like vsyscall sections.
+ */
+ __map_groups__fixup_end(kmaps, map->type);
+ }
+ }
+ err = nr;
+out_elf_end:
+ return err;
+}
+
+static int elf_read_maps(Elf *elf, bool exe, mapfn_t mapfn, void *data)
+{
+ GElf_Phdr phdr;
+ size_t i, phdrnum;
+ int err;
+ u64 sz;
+
+ if (elf_getphdrnum(elf, &phdrnum))
+ return -1;
+
+ for (i = 0; i < phdrnum; i++) {
+ if (gelf_getphdr(elf, i, &phdr) == NULL)
+ return -1;
+ if (phdr.p_type != PT_LOAD)
+ continue;
+ if (exe) {
+ if (!(phdr.p_flags & PF_X))
+ continue;
+ } else {
+ if (!(phdr.p_flags & PF_R))
+ continue;
+ }
+ sz = min(phdr.p_memsz, phdr.p_filesz);
+ if (!sz)
+ continue;
+ err = mapfn(phdr.p_vaddr, sz, phdr.p_offset, data);
+ if (err)
+ return err;
+ }
+ return 0;
+}
+
+int file__read_maps(int fd, bool exe, mapfn_t mapfn, void *data,
+ bool *is_64_bit)
+{
+ int err;
+ Elf *elf;
+
+ elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
+ if (elf == NULL)
+ return -1;
+
+ if (is_64_bit)
+ *is_64_bit = (gelf_getclass(elf) == ELFCLASS64);
+
+ err = elf_read_maps(elf, exe, mapfn, data);
+
+ elf_end(elf);
+ return err;
+}
+
+enum dso_type dso__type_fd(int fd)
+{
+ enum dso_type dso_type = DSO__TYPE_UNKNOWN;
+ GElf_Ehdr ehdr;
+ Elf_Kind ek;
+ Elf *elf;
+
+ elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
+ if (elf == NULL)
+ goto out;
+
+ ek = elf_kind(elf);
+ if (ek != ELF_K_ELF)
+ goto out_end;
+
+ if (gelf_getclass(elf) == ELFCLASS64) {
+ dso_type = DSO__TYPE_64BIT;
+ goto out_end;
+ }
+
+ if (gelf_getehdr(elf, &ehdr) == NULL)
+ goto out_end;
+
+ if (ehdr.e_machine == EM_X86_64)
+ dso_type = DSO__TYPE_X32BIT;
+ else
+ dso_type = DSO__TYPE_32BIT;
+out_end:
+ elf_end(elf);
+out:
+ return dso_type;
+}
+
+static int copy_bytes(int from, off_t from_offs, int to, off_t to_offs, u64 len)
+{
+ ssize_t r;
+ size_t n;
+ int err = -1;
+ char *buf = malloc(page_size);
+
+ if (buf == NULL)
+ return -1;
+
+ if (lseek(to, to_offs, SEEK_SET) != to_offs)
+ goto out;
+
+ if (lseek(from, from_offs, SEEK_SET) != from_offs)
+ goto out;
+
+ while (len) {
+ n = page_size;
+ if (len < n)
+ n = len;
+ /* Use read because mmap won't work on proc files */
+ r = read(from, buf, n);
+ if (r < 0)
+ goto out;
+ if (!r)
+ break;
+ n = r;
+ r = write(to, buf, n);
+ if (r < 0)
+ goto out;
+ if ((size_t)r != n)
+ goto out;
+ len -= n;
+ }
+
+ err = 0;
+out:
+ free(buf);
+ return err;
+}
+
+struct kcore {
+ int fd;
+ int elfclass;
+ Elf *elf;
+ GElf_Ehdr ehdr;
+};
+
+static int kcore__open(struct kcore *kcore, const char *filename)
+{
+ GElf_Ehdr *ehdr;
+
+ kcore->fd = open(filename, O_RDONLY);
+ if (kcore->fd == -1)
+ return -1;
+
+ kcore->elf = elf_begin(kcore->fd, ELF_C_READ, NULL);
+ if (!kcore->elf)
+ goto out_close;
+
+ kcore->elfclass = gelf_getclass(kcore->elf);
+ if (kcore->elfclass == ELFCLASSNONE)
+ goto out_end;
+
+ ehdr = gelf_getehdr(kcore->elf, &kcore->ehdr);
+ if (!ehdr)
+ goto out_end;
+
+ return 0;
+
+out_end:
+ elf_end(kcore->elf);
+out_close:
+ close(kcore->fd);
+ return -1;
+}
+
+static int kcore__init(struct kcore *kcore, char *filename, int elfclass,
+ bool temp)
+{
+ GElf_Ehdr *ehdr;
+
+ kcore->elfclass = elfclass;
+
+ if (temp)
+ kcore->fd = mkstemp(filename);
+ else
+ kcore->fd = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0400);
+ if (kcore->fd == -1)
+ return -1;
+
+ kcore->elf = elf_begin(kcore->fd, ELF_C_WRITE, NULL);
+ if (!kcore->elf)
+ goto out_close;
+
+ if (!gelf_newehdr(kcore->elf, elfclass))
+ goto out_end;
+
+ ehdr = gelf_getehdr(kcore->elf, &kcore->ehdr);
+ if (!ehdr)
+ goto out_end;
+
+ return 0;
+
+out_end:
+ elf_end(kcore->elf);
+out_close:
+ close(kcore->fd);
+ unlink(filename);
+ return -1;
+}
+
+static void kcore__close(struct kcore *kcore)
+{
+ elf_end(kcore->elf);
+ close(kcore->fd);
+}
+
+static int kcore__copy_hdr(struct kcore *from, struct kcore *to, size_t count)
+{
+ GElf_Ehdr *ehdr = &to->ehdr;
+ GElf_Ehdr *kehdr = &from->ehdr;
+
+ memcpy(ehdr->e_ident, kehdr->e_ident, EI_NIDENT);
+ ehdr->e_type = kehdr->e_type;
+ ehdr->e_machine = kehdr->e_machine;
+ ehdr->e_version = kehdr->e_version;
+ ehdr->e_entry = 0;
+ ehdr->e_shoff = 0;
+ ehdr->e_flags = kehdr->e_flags;
+ ehdr->e_phnum = count;
+ ehdr->e_shentsize = 0;
+ ehdr->e_shnum = 0;
+ ehdr->e_shstrndx = 0;
+
+ if (from->elfclass == ELFCLASS32) {
+ ehdr->e_phoff = sizeof(Elf32_Ehdr);
+ ehdr->e_ehsize = sizeof(Elf32_Ehdr);
+ ehdr->e_phentsize = sizeof(Elf32_Phdr);
+ } else {
+ ehdr->e_phoff = sizeof(Elf64_Ehdr);
+ ehdr->e_ehsize = sizeof(Elf64_Ehdr);
+ ehdr->e_phentsize = sizeof(Elf64_Phdr);
+ }
+
+ if (!gelf_update_ehdr(to->elf, ehdr))
+ return -1;
+
+ if (!gelf_newphdr(to->elf, count))
+ return -1;
+
+ return 0;
+}
+
+static int kcore__add_phdr(struct kcore *kcore, int idx, off_t offset,
+ u64 addr, u64 len)
+{
+ GElf_Phdr gphdr;
+ GElf_Phdr *phdr;
+
+ phdr = gelf_getphdr(kcore->elf, idx, &gphdr);
+ if (!phdr)
+ return -1;
+
+ phdr->p_type = PT_LOAD;
+ phdr->p_flags = PF_R | PF_W | PF_X;
+ phdr->p_offset = offset;
+ phdr->p_vaddr = addr;
+ phdr->p_paddr = 0;
+ phdr->p_filesz = len;
+ phdr->p_memsz = len;
+ phdr->p_align = page_size;
+
+ if (!gelf_update_phdr(kcore->elf, idx, phdr))
+ return -1;
+
+ return 0;
+}
+
+static off_t kcore__write(struct kcore *kcore)
+{
+ return elf_update(kcore->elf, ELF_C_WRITE);
+}
+
+struct phdr_data {
+ off_t offset;
+ u64 addr;
+ u64 len;
+};
+
+struct kcore_copy_info {
+ u64 stext;
+ u64 etext;
+ u64 first_symbol;
+ u64 last_symbol;
+ u64 first_module;
+ u64 last_module_symbol;
+ struct phdr_data kernel_map;
+ struct phdr_data modules_map;
+};
+
+static int kcore_copy__process_kallsyms(void *arg, const char *name, char type,
+ u64 start)
+{
+ struct kcore_copy_info *kci = arg;
+
+ if (!symbol_type__is_a(type, MAP__FUNCTION))
+ return 0;
+
+ if (strchr(name, '[')) {
+ if (start > kci->last_module_symbol)
+ kci->last_module_symbol = start;
+ return 0;
+ }
+
+ if (!kci->first_symbol || start < kci->first_symbol)
+ kci->first_symbol = start;
+
+ if (!kci->last_symbol || start > kci->last_symbol)
+ kci->last_symbol = start;
+
+ if (!strcmp(name, "_stext")) {
+ kci->stext = start;
+ return 0;
+ }
+
+ if (!strcmp(name, "_etext")) {
+ kci->etext = start;
+ return 0;
+ }
+
+ return 0;
+}
+
+static int kcore_copy__parse_kallsyms(struct kcore_copy_info *kci,
+ const char *dir)
+{
+ char kallsyms_filename[PATH_MAX];
+
+ scnprintf(kallsyms_filename, PATH_MAX, "%s/kallsyms", dir);
+
+ if (symbol__restricted_filename(kallsyms_filename, "/proc/kallsyms"))
+ return -1;
+
+ if (kallsyms__parse(kallsyms_filename, kci,
+ kcore_copy__process_kallsyms) < 0)
+ return -1;
+
+ return 0;
+}
+
+static int kcore_copy__process_modules(void *arg,
+ const char *name __maybe_unused,
+ u64 start)
+{
+ struct kcore_copy_info *kci = arg;
+
+ if (!kci->first_module || start < kci->first_module)
+ kci->first_module = start;
+
+ return 0;
+}
+
+static int kcore_copy__parse_modules(struct kcore_copy_info *kci,
+ const char *dir)
+{
+ char modules_filename[PATH_MAX];
+
+ scnprintf(modules_filename, PATH_MAX, "%s/modules", dir);
+
+ if (symbol__restricted_filename(modules_filename, "/proc/modules"))
+ return -1;
+
+ if (modules__parse(modules_filename, kci,
+ kcore_copy__process_modules) < 0)
+ return -1;
+
+ return 0;
+}
+
+static void kcore_copy__map(struct phdr_data *p, u64 start, u64 end, u64 pgoff,
+ u64 s, u64 e)
+{
+ if (p->addr || s < start || s >= end)
+ return;
+
+ p->addr = s;
+ p->offset = (s - start) + pgoff;
+ p->len = e < end ? e - s : end - s;
+}
+
+static int kcore_copy__read_map(u64 start, u64 len, u64 pgoff, void *data)
+{
+ struct kcore_copy_info *kci = data;
+ u64 end = start + len;
+
+ kcore_copy__map(&kci->kernel_map, start, end, pgoff, kci->stext,
+ kci->etext);
+
+ kcore_copy__map(&kci->modules_map, start, end, pgoff, kci->first_module,
+ kci->last_module_symbol);
+
+ return 0;
+}
+
+static int kcore_copy__read_maps(struct kcore_copy_info *kci, Elf *elf)
+{
+ if (elf_read_maps(elf, true, kcore_copy__read_map, kci) < 0)
+ return -1;
+
+ return 0;
+}
+
+static int kcore_copy__calc_maps(struct kcore_copy_info *kci, const char *dir,
+ Elf *elf)
+{
+ if (kcore_copy__parse_kallsyms(kci, dir))
+ return -1;
+
+ if (kcore_copy__parse_modules(kci, dir))
+ return -1;
+
+ if (kci->stext)
+ kci->stext = round_down(kci->stext, page_size);
+ else
+ kci->stext = round_down(kci->first_symbol, page_size);
+
+ if (kci->etext) {
+ kci->etext = round_up(kci->etext, page_size);
+ } else if (kci->last_symbol) {
+ kci->etext = round_up(kci->last_symbol, page_size);
+ kci->etext += page_size;
+ }
+
+ kci->first_module = round_down(kci->first_module, page_size);
+
+ if (kci->last_module_symbol) {
+ kci->last_module_symbol = round_up(kci->last_module_symbol,
+ page_size);
+ kci->last_module_symbol += page_size;
+ }
+
+ if (!kci->stext || !kci->etext)
+ return -1;
+
+ if (kci->first_module && !kci->last_module_symbol)
+ return -1;
+
+ return kcore_copy__read_maps(kci, elf);
+}
+
+static int kcore_copy__copy_file(const char *from_dir, const char *to_dir,
+ const char *name)
+{
+ char from_filename[PATH_MAX];
+ char to_filename[PATH_MAX];
+
+ scnprintf(from_filename, PATH_MAX, "%s/%s", from_dir, name);
+ scnprintf(to_filename, PATH_MAX, "%s/%s", to_dir, name);
+
+ return copyfile_mode(from_filename, to_filename, 0400);
+}
+
+static int kcore_copy__unlink(const char *dir, const char *name)
+{
+ char filename[PATH_MAX];
+
+ scnprintf(filename, PATH_MAX, "%s/%s", dir, name);
+
+ return unlink(filename);
+}
+
+static int kcore_copy__compare_fds(int from, int to)
+{
+ char *buf_from;
+ char *buf_to;
+ ssize_t ret;
+ size_t len;
+ int err = -1;
+
+ buf_from = malloc(page_size);
+ buf_to = malloc(page_size);
+ if (!buf_from || !buf_to)
+ goto out;
+
+ while (1) {
+ /* Use read because mmap won't work on proc files */
+ ret = read(from, buf_from, page_size);
+ if (ret < 0)
+ goto out;
+
+ if (!ret)
+ break;
+
+ len = ret;
+
+ if (readn(to, buf_to, len) != (int)len)
+ goto out;
+
+ if (memcmp(buf_from, buf_to, len))
+ goto out;
+ }
+
+ err = 0;
+out:
+ free(buf_to);
+ free(buf_from);
+ return err;
+}
+
+static int kcore_copy__compare_files(const char *from_filename,
+ const char *to_filename)
+{
+ int from, to, err = -1;
+
+ from = open(from_filename, O_RDONLY);
+ if (from < 0)
+ return -1;
+
+ to = open(to_filename, O_RDONLY);
+ if (to < 0)
+ goto out_close_from;
+
+ err = kcore_copy__compare_fds(from, to);
+
+ close(to);
+out_close_from:
+ close(from);
+ return err;
+}
+
+static int kcore_copy__compare_file(const char *from_dir, const char *to_dir,
+ const char *name)
+{
+ char from_filename[PATH_MAX];
+ char to_filename[PATH_MAX];
+
+ scnprintf(from_filename, PATH_MAX, "%s/%s", from_dir, name);
+ scnprintf(to_filename, PATH_MAX, "%s/%s", to_dir, name);
+
+ return kcore_copy__compare_files(from_filename, to_filename);
+}
+
+/**
+ * kcore_copy - copy kallsyms, modules and kcore from one directory to another.
+ * @from_dir: from directory
+ * @to_dir: to directory
+ *
+ * This function copies kallsyms, modules and kcore files from one directory to
+ * another. kallsyms and modules are copied entirely. Only code segments are
+ * copied from kcore. It is assumed that two segments suffice: one for the
+ * kernel proper and one for all the modules. The code segments are determined
+ * from kallsyms and modules files. The kernel map starts at _stext or the
+ * lowest function symbol, and ends at _etext or the highest function symbol.
+ * The module map starts at the lowest module address and ends at the highest
+ * module symbol. Start addresses are rounded down to the nearest page. End
+ * addresses are rounded up to the nearest page. An extra page is added to the
+ * highest kernel symbol and highest module symbol to, hopefully, encompass that
+ * symbol too. Because it contains only code sections, the resulting kcore is
+ * unusual. One significant peculiarity is that the mapping (start -> pgoff)
+ * is not the same for the kernel map and the modules map. That happens because
+ * the data is copied adjacently whereas the original kcore has gaps. Finally,
+ * kallsyms and modules files are compared with their copies to check that
+ * modules have not been loaded or unloaded while the copies were taking place.
+ *
+ * Return: %0 on success, %-1 on failure.
+ */
+int kcore_copy(const char *from_dir, const char *to_dir)
+{
+ struct kcore kcore;
+ struct kcore extract;
+ size_t count = 2;
+ int idx = 0, err = -1;
+ off_t offset = page_size, sz, modules_offset = 0;
+ struct kcore_copy_info kci = { .stext = 0, };
+ char kcore_filename[PATH_MAX];
+ char extract_filename[PATH_MAX];
+
+ if (kcore_copy__copy_file(from_dir, to_dir, "kallsyms"))
+ return -1;
+
+ if (kcore_copy__copy_file(from_dir, to_dir, "modules"))
+ goto out_unlink_kallsyms;
+
+ scnprintf(kcore_filename, PATH_MAX, "%s/kcore", from_dir);
+ scnprintf(extract_filename, PATH_MAX, "%s/kcore", to_dir);
+
+ if (kcore__open(&kcore, kcore_filename))
+ goto out_unlink_modules;
+
+ if (kcore_copy__calc_maps(&kci, from_dir, kcore.elf))
+ goto out_kcore_close;
+
+ if (kcore__init(&extract, extract_filename, kcore.elfclass, false))
+ goto out_kcore_close;
+
+ if (!kci.modules_map.addr)
+ count -= 1;
+
+ if (kcore__copy_hdr(&kcore, &extract, count))
+ goto out_extract_close;
+
+ if (kcore__add_phdr(&extract, idx++, offset, kci.kernel_map.addr,
+ kci.kernel_map.len))
+ goto out_extract_close;
+
+ if (kci.modules_map.addr) {
+ modules_offset = offset + kci.kernel_map.len;
+ if (kcore__add_phdr(&extract, idx, modules_offset,
+ kci.modules_map.addr, kci.modules_map.len))
+ goto out_extract_close;
+ }
+
+ sz = kcore__write(&extract);
+ if (sz < 0 || sz > offset)
+ goto out_extract_close;
+
+ if (copy_bytes(kcore.fd, kci.kernel_map.offset, extract.fd, offset,
+ kci.kernel_map.len))
+ goto out_extract_close;
+
+ if (modules_offset && copy_bytes(kcore.fd, kci.modules_map.offset,
+ extract.fd, modules_offset,
+ kci.modules_map.len))
+ goto out_extract_close;
+
+ if (kcore_copy__compare_file(from_dir, to_dir, "modules"))
+ goto out_extract_close;
+
+ if (kcore_copy__compare_file(from_dir, to_dir, "kallsyms"))
+ goto out_extract_close;
+
+ err = 0;
+
+out_extract_close:
+ kcore__close(&extract);
+ if (err)
+ unlink(extract_filename);
+out_kcore_close:
+ kcore__close(&kcore);
+out_unlink_modules:
+ if (err)
+ kcore_copy__unlink(to_dir, "modules");
+out_unlink_kallsyms:
+ if (err)
+ kcore_copy__unlink(to_dir, "kallsyms");
+
+ return err;
+}
+
+int kcore_extract__create(struct kcore_extract *kce)
+{
+ struct kcore kcore;
+ struct kcore extract;
+ size_t count = 1;
+ int idx = 0, err = -1;
+ off_t offset = page_size, sz;
+
+ if (kcore__open(&kcore, kce->kcore_filename))
+ return -1;
+
+ strcpy(kce->extract_filename, PERF_KCORE_EXTRACT);
+ if (kcore__init(&extract, kce->extract_filename, kcore.elfclass, true))
+ goto out_kcore_close;
+
+ if (kcore__copy_hdr(&kcore, &extract, count))
+ goto out_extract_close;
+
+ if (kcore__add_phdr(&extract, idx, offset, kce->addr, kce->len))
+ goto out_extract_close;
+
+ sz = kcore__write(&extract);
+ if (sz < 0 || sz > offset)
+ goto out_extract_close;
+
+ if (copy_bytes(kcore.fd, kce->offs, extract.fd, offset, kce->len))
+ goto out_extract_close;
+
+ err = 0;
+
+out_extract_close:
+ kcore__close(&extract);
+ if (err)
+ unlink(kce->extract_filename);
+out_kcore_close:
+ kcore__close(&kcore);
+
+ return err;
+}
+
+void kcore_extract__delete(struct kcore_extract *kce)
+{
+ unlink(kce->extract_filename);
+}
+
+void symbol__elf_init(void)
+{
+ elf_version(EV_CURRENT);
+}
Code Review / kvmfornfv.git / blobdiff