mirror of https://gitee.com/openkylin/qemu.git
elf-ops.h: Add get_elf_note_type()
Introduce a routine which, given a pointer to a range of ELF Notes, searches through them looking for a note matching the type specified and returns a pointer to the matching ELF note. get_elf_note_type() is used by elf_load[32|64]() to find the specified note type required by the 'elf_note_fn' parameter added in the previous commit. Signed-off-by: Liam Merwick <Liam.Merwick@oracle.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Liam Merwick <liam.merwick@oracle.com>
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@ -265,6 +265,51 @@ fail:
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return ret;
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}
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/*
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* Given 'nhdr', a pointer to a range of ELF Notes, search through them
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* for a note matching type 'elf_note_type' and return a pointer to
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* the matching ELF note.
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*/
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static struct elf_note *glue(get_elf_note_type, SZ)(struct elf_note *nhdr,
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elf_word note_size,
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elf_word phdr_align,
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elf_word elf_note_type)
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{
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elf_word nhdr_size = sizeof(struct elf_note);
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elf_word elf_note_entry_offset = 0;
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elf_word note_type;
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elf_word nhdr_namesz;
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elf_word nhdr_descsz;
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if (nhdr == NULL) {
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return NULL;
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}
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note_type = nhdr->n_type;
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while (note_type != elf_note_type) {
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nhdr_namesz = nhdr->n_namesz;
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nhdr_descsz = nhdr->n_descsz;
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elf_note_entry_offset = nhdr_size +
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QEMU_ALIGN_UP(nhdr_namesz, phdr_align) +
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QEMU_ALIGN_UP(nhdr_descsz, phdr_align);
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/*
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* If the offset calculated in this iteration exceeds the
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* supplied size, we are done and no matching note was found.
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*/
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if (elf_note_entry_offset > note_size) {
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return NULL;
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}
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/* skip to the next ELF Note entry */
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nhdr = (void *)nhdr + elf_note_entry_offset;
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note_type = nhdr->n_type;
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}
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return nhdr;
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}
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static int glue(load_elf, SZ)(const char *name, int fd,
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uint64_t (*elf_note_fn)(void *, void *, bool),
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uint64_t (*translate_fn)(void *, uint64_t),
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@ -497,6 +542,36 @@ static int glue(load_elf, SZ)(const char *name, int fd,
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high = addr + mem_size;
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data = NULL;
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} else if (ph->p_type == PT_NOTE && elf_note_fn) {
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struct elf_note *nhdr = NULL;
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file_size = ph->p_filesz; /* Size of the range of ELF notes */
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data = g_malloc0(file_size);
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if (ph->p_filesz > 0) {
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if (lseek(fd, ph->p_offset, SEEK_SET) < 0) {
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goto fail;
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}
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if (read(fd, data, file_size) != file_size) {
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goto fail;
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}
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}
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/*
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* Search the ELF notes to find one with a type matching the
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* value passed in via 'translate_opaque'
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*/
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nhdr = (struct elf_note *)data;
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assert(translate_opaque != NULL);
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nhdr = glue(get_elf_note_type, SZ)(nhdr, file_size, ph->p_align,
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*(uint64_t *)translate_opaque);
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if (nhdr != NULL) {
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bool is64 =
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sizeof(struct elf_note) == sizeof(struct elf64_note);
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elf_note_fn((void *)nhdr, (void *)&ph->p_align, is64);
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}
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g_free(data);
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data = NULL;
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}
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}
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