v4.19.13 snapshot.
diff --git a/tools/perf/util/symbol-minimal.c b/tools/perf/util/symbol-minimal.c
new file mode 100644
index 0000000..7119df7
--- /dev/null
+++ b/tools/perf/util/symbol-minimal.c
@@ -0,0 +1,383 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "symbol.h"
+#include "util.h"
+
+#include <errno.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <string.h>
+#include <byteswap.h>
+#include <sys/stat.h>
+
+
+static bool check_need_swap(int file_endian)
+{
+ const int data = 1;
+ u8 *check = (u8 *)&data;
+ int host_endian;
+
+ if (check[0] == 1)
+ host_endian = ELFDATA2LSB;
+ else
+ host_endian = ELFDATA2MSB;
+
+ return host_endian != file_endian;
+}
+
+#define NOTE_ALIGN(sz) (((sz) + 3) & ~3)
+
+#define NT_GNU_BUILD_ID 3
+
+static int read_build_id(void *note_data, size_t note_len, void *bf,
+ size_t size, bool need_swap)
+{
+ struct {
+ u32 n_namesz;
+ u32 n_descsz;
+ u32 n_type;
+ } *nhdr;
+ void *ptr;
+
+ ptr = note_data;
+ while (ptr < (note_data + note_len)) {
+ const char *name;
+ size_t namesz, descsz;
+
+ nhdr = ptr;
+ if (need_swap) {
+ nhdr->n_namesz = bswap_32(nhdr->n_namesz);
+ nhdr->n_descsz = bswap_32(nhdr->n_descsz);
+ nhdr->n_type = bswap_32(nhdr->n_type);
+ }
+
+ namesz = NOTE_ALIGN(nhdr->n_namesz);
+ descsz = NOTE_ALIGN(nhdr->n_descsz);
+
+ 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);
+ return 0;
+ }
+ }
+ ptr += descsz;
+ }
+
+ return -1;
+}
+
+int filename__read_debuglink(const char *filename __maybe_unused,
+ char *debuglink __maybe_unused,
+ size_t size __maybe_unused)
+{
+ return -1;
+}
+
+/*
+ * Just try PT_NOTE header otherwise fails
+ */
+int filename__read_build_id(const char *filename, void *bf, size_t size)
+{
+ FILE *fp;
+ int ret = -1;
+ bool need_swap = false;
+ u8 e_ident[EI_NIDENT];
+ size_t buf_size;
+ void *buf;
+ int i;
+
+ fp = fopen(filename, "r");
+ if (fp == NULL)
+ return -1;
+
+ if (fread(e_ident, sizeof(e_ident), 1, fp) != 1)
+ goto out;
+
+ if (memcmp(e_ident, ELFMAG, SELFMAG) ||
+ e_ident[EI_VERSION] != EV_CURRENT)
+ goto out;
+
+ need_swap = check_need_swap(e_ident[EI_DATA]);
+
+ /* for simplicity */
+ fseek(fp, 0, SEEK_SET);
+
+ if (e_ident[EI_CLASS] == ELFCLASS32) {
+ Elf32_Ehdr ehdr;
+ Elf32_Phdr *phdr;
+
+ if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
+ goto out;
+
+ if (need_swap) {
+ ehdr.e_phoff = bswap_32(ehdr.e_phoff);
+ ehdr.e_phentsize = bswap_16(ehdr.e_phentsize);
+ ehdr.e_phnum = bswap_16(ehdr.e_phnum);
+ }
+
+ buf_size = ehdr.e_phentsize * ehdr.e_phnum;
+ buf = malloc(buf_size);
+ if (buf == NULL)
+ goto out;
+
+ fseek(fp, ehdr.e_phoff, SEEK_SET);
+ if (fread(buf, buf_size, 1, fp) != 1)
+ goto out_free;
+
+ for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) {
+ void *tmp;
+ long offset;
+
+ if (need_swap) {
+ phdr->p_type = bswap_32(phdr->p_type);
+ phdr->p_offset = bswap_32(phdr->p_offset);
+ phdr->p_filesz = bswap_32(phdr->p_filesz);
+ }
+
+ if (phdr->p_type != PT_NOTE)
+ continue;
+
+ buf_size = phdr->p_filesz;
+ offset = phdr->p_offset;
+ tmp = realloc(buf, buf_size);
+ if (tmp == NULL)
+ goto out_free;
+
+ buf = tmp;
+ fseek(fp, offset, SEEK_SET);
+ if (fread(buf, buf_size, 1, fp) != 1)
+ goto out_free;
+
+ ret = read_build_id(buf, buf_size, bf, size, need_swap);
+ if (ret == 0)
+ ret = size;
+ break;
+ }
+ } else {
+ Elf64_Ehdr ehdr;
+ Elf64_Phdr *phdr;
+
+ if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
+ goto out;
+
+ if (need_swap) {
+ ehdr.e_phoff = bswap_64(ehdr.e_phoff);
+ ehdr.e_phentsize = bswap_16(ehdr.e_phentsize);
+ ehdr.e_phnum = bswap_16(ehdr.e_phnum);
+ }
+
+ buf_size = ehdr.e_phentsize * ehdr.e_phnum;
+ buf = malloc(buf_size);
+ if (buf == NULL)
+ goto out;
+
+ fseek(fp, ehdr.e_phoff, SEEK_SET);
+ if (fread(buf, buf_size, 1, fp) != 1)
+ goto out_free;
+
+ for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) {
+ void *tmp;
+ long offset;
+
+ if (need_swap) {
+ phdr->p_type = bswap_32(phdr->p_type);
+ phdr->p_offset = bswap_64(phdr->p_offset);
+ phdr->p_filesz = bswap_64(phdr->p_filesz);
+ }
+
+ if (phdr->p_type != PT_NOTE)
+ continue;
+
+ buf_size = phdr->p_filesz;
+ offset = phdr->p_offset;
+ tmp = realloc(buf, buf_size);
+ if (tmp == NULL)
+ goto out_free;
+
+ buf = tmp;
+ fseek(fp, offset, SEEK_SET);
+ if (fread(buf, buf_size, 1, fp) != 1)
+ goto out_free;
+
+ ret = read_build_id(buf, buf_size, bf, size, need_swap);
+ if (ret == 0)
+ ret = size;
+ break;
+ }
+ }
+out_free:
+ free(buf);
+out:
+ fclose(fp);
+ return ret;
+}
+
+int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
+{
+ int fd;
+ int ret = -1;
+ struct stat stbuf;
+ size_t buf_size;
+ void *buf;
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ return -1;
+
+ if (fstat(fd, &stbuf) < 0)
+ goto out;
+
+ buf_size = stbuf.st_size;
+ buf = malloc(buf_size);
+ if (buf == NULL)
+ goto out;
+
+ if (read(fd, buf, buf_size) != (ssize_t) buf_size)
+ goto out_free;
+
+ ret = read_build_id(buf, buf_size, build_id, size, false);
+out_free:
+ free(buf);
+out:
+ close(fd);
+ return ret;
+}
+
+int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
+ enum dso_binary_type type)
+{
+ int fd = open(name, O_RDONLY);
+ if (fd < 0)
+ goto out_errno;
+
+ ss->name = strdup(name);
+ if (!ss->name)
+ goto out_close;
+
+ ss->fd = fd;
+ ss->type = type;
+
+ return 0;
+out_close:
+ close(fd);
+out_errno:
+ dso->load_errno = errno;
+ return -1;
+}
+
+bool symsrc__possibly_runtime(struct symsrc *ss __maybe_unused)
+{
+ /* Assume all sym sources could be a runtime image. */
+ return true;
+}
+
+bool symsrc__has_symtab(struct symsrc *ss __maybe_unused)
+{
+ return false;
+}
+
+void symsrc__destroy(struct symsrc *ss)
+{
+ zfree(&ss->name);
+ close(ss->fd);
+}
+
+int dso__synthesize_plt_symbols(struct dso *dso __maybe_unused,
+ struct symsrc *ss __maybe_unused)
+{
+ return 0;
+}
+
+static int fd__is_64_bit(int fd)
+{
+ u8 e_ident[EI_NIDENT];
+
+ if (lseek(fd, 0, SEEK_SET))
+ return -1;
+
+ if (readn(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident))
+ return -1;
+
+ if (memcmp(e_ident, ELFMAG, SELFMAG) ||
+ e_ident[EI_VERSION] != EV_CURRENT)
+ return -1;
+
+ return e_ident[EI_CLASS] == ELFCLASS64;
+}
+
+enum dso_type dso__type_fd(int fd)
+{
+ Elf64_Ehdr ehdr;
+ int ret;
+
+ ret = fd__is_64_bit(fd);
+ if (ret < 0)
+ return DSO__TYPE_UNKNOWN;
+
+ if (ret)
+ return DSO__TYPE_64BIT;
+
+ if (readn(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
+ return DSO__TYPE_UNKNOWN;
+
+ if (ehdr.e_machine == EM_X86_64)
+ return DSO__TYPE_X32BIT;
+
+ return DSO__TYPE_32BIT;
+}
+
+int dso__load_sym(struct dso *dso, struct map *map __maybe_unused,
+ struct symsrc *ss,
+ struct symsrc *runtime_ss __maybe_unused,
+ int kmodule __maybe_unused)
+{
+ unsigned char build_id[BUILD_ID_SIZE];
+ int ret;
+
+ ret = fd__is_64_bit(ss->fd);
+ if (ret >= 0)
+ dso->is_64_bit = ret;
+
+ if (filename__read_build_id(ss->name, build_id, BUILD_ID_SIZE) > 0) {
+ dso__set_build_id(dso, build_id);
+ }
+ return 0;
+}
+
+int file__read_maps(int fd __maybe_unused, bool exe __maybe_unused,
+ mapfn_t mapfn __maybe_unused, void *data __maybe_unused,
+ bool *is_64_bit __maybe_unused)
+{
+ return -1;
+}
+
+int kcore_extract__create(struct kcore_extract *kce __maybe_unused)
+{
+ return -1;
+}
+
+void kcore_extract__delete(struct kcore_extract *kce __maybe_unused)
+{
+}
+
+int kcore_copy(const char *from_dir __maybe_unused,
+ const char *to_dir __maybe_unused)
+{
+ return -1;
+}
+
+void symbol__elf_init(void)
+{
+}
+
+char *dso__demangle_sym(struct dso *dso __maybe_unused,
+ int kmodule __maybe_unused,
+ const char *elf_name __maybe_unused)
+{
+ return NULL;
+}