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266 lines
8.6 KiB
C
266 lines
8.6 KiB
C
/******************************************************************************
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* libelf.h
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __XC_LIBELF__
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#define __XC_LIBELF__ 1
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#if defined(__i386__) || defined(__x86_64__) || defined(__ia64__)
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#define XEN_ELF_LITTLE_ENDIAN
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#else
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#error define architectural endianness
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#endif
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#undef ELFSIZE
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#include "elfnote.h"
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#include "elfstructs.h"
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#include "features.h"
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/* ------------------------------------------------------------------------ */
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typedef union {
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Elf32_Ehdr e32;
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Elf64_Ehdr e64;
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} elf_ehdr;
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typedef union {
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Elf32_Phdr e32;
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Elf64_Phdr e64;
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} elf_phdr;
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typedef union {
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Elf32_Shdr e32;
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Elf64_Shdr e64;
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} elf_shdr;
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typedef union {
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Elf32_Sym e32;
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Elf64_Sym e64;
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} elf_sym;
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typedef union {
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Elf32_Rel e32;
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Elf64_Rel e64;
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} elf_rel;
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typedef union {
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Elf32_Rela e32;
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Elf64_Rela e64;
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} elf_rela;
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typedef union {
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Elf32_Note e32;
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Elf64_Note e64;
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} elf_note;
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struct elf_binary {
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/* elf binary */
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const char *image;
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size_t size;
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char class;
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char data;
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const elf_ehdr *ehdr;
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const char *sec_strtab;
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const elf_shdr *sym_tab;
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const char *sym_strtab;
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/* loaded to */
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char *dest;
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uint64_t pstart;
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uint64_t pend;
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uint64_t reloc_offset;
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uint64_t bsd_symtab_pstart;
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uint64_t bsd_symtab_pend;
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#ifndef __XEN__
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/* misc */
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FILE *log;
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#endif
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int verbose;
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};
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/* ------------------------------------------------------------------------ */
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/* accessing elf header fields */
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#ifdef XEN_ELF_BIG_ENDIAN
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# define NATIVE_ELFDATA ELFDATA2MSB
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#else
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# define NATIVE_ELFDATA ELFDATA2LSB
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#endif
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#define elf_32bit(elf) (ELFCLASS32 == (elf)->class)
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#define elf_64bit(elf) (ELFCLASS64 == (elf)->class)
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#define elf_msb(elf) (ELFDATA2MSB == (elf)->data)
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#define elf_lsb(elf) (ELFDATA2LSB == (elf)->data)
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#define elf_swap(elf) (NATIVE_ELFDATA != (elf)->data)
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#define elf_uval(elf, str, elem) \
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((ELFCLASS64 == (elf)->class) \
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? elf_access_unsigned((elf), (str), \
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offsetof(typeof(*(str)),e64.elem), \
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sizeof((str)->e64.elem)) \
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: elf_access_unsigned((elf), (str), \
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offsetof(typeof(*(str)),e32.elem), \
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sizeof((str)->e32.elem)))
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#define elf_sval(elf, str, elem) \
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((ELFCLASS64 == (elf)->class) \
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? elf_access_signed((elf), (str), \
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offsetof(typeof(*(str)),e64.elem), \
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sizeof((str)->e64.elem)) \
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: elf_access_signed((elf), (str), \
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offsetof(typeof(*(str)),e32.elem), \
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sizeof((str)->e32.elem)))
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#define elf_size(elf, str) \
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((ELFCLASS64 == (elf)->class) \
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? sizeof((str)->e64) : sizeof((str)->e32))
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uint64_t elf_access_unsigned(struct elf_binary *elf, const void *ptr,
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uint64_t offset, size_t size);
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int64_t elf_access_signed(struct elf_binary *elf, const void *ptr,
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uint64_t offset, size_t size);
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uint64_t elf_round_up(struct elf_binary *elf, uint64_t addr);
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/* ------------------------------------------------------------------------ */
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/* xc_libelf_tools.c */
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int elf_shdr_count(struct elf_binary *elf);
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int elf_phdr_count(struct elf_binary *elf);
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const elf_shdr *elf_shdr_by_name(struct elf_binary *elf, const char *name);
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const elf_shdr *elf_shdr_by_index(struct elf_binary *elf, int index);
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const elf_phdr *elf_phdr_by_index(struct elf_binary *elf, int index);
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const char *elf_section_name(struct elf_binary *elf, const elf_shdr * shdr);
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const void *elf_section_start(struct elf_binary *elf, const elf_shdr * shdr);
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const void *elf_section_end(struct elf_binary *elf, const elf_shdr * shdr);
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const void *elf_segment_start(struct elf_binary *elf, const elf_phdr * phdr);
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const void *elf_segment_end(struct elf_binary *elf, const elf_phdr * phdr);
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const elf_sym *elf_sym_by_name(struct elf_binary *elf, const char *symbol);
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const elf_sym *elf_sym_by_index(struct elf_binary *elf, int index);
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const char *elf_note_name(struct elf_binary *elf, const elf_note * note);
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const void *elf_note_desc(struct elf_binary *elf, const elf_note * note);
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uint64_t elf_note_numeric(struct elf_binary *elf, const elf_note * note);
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const elf_note *elf_note_next(struct elf_binary *elf, const elf_note * note);
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int elf_is_elfbinary(const void *image);
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int elf_phdr_is_loadable(struct elf_binary *elf, const elf_phdr * phdr);
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/* ------------------------------------------------------------------------ */
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/* xc_libelf_loader.c */
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int elf_init(struct elf_binary *elf, const char *image, size_t size);
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#ifdef __XEN__
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void elf_set_verbose(struct elf_binary *elf);
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#else
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void elf_set_logfile(struct elf_binary *elf, FILE * log, int verbose);
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#endif
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void elf_parse_binary(struct elf_binary *elf);
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void elf_load_binary(struct elf_binary *elf);
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void *elf_get_ptr(struct elf_binary *elf, unsigned long addr);
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uint64_t elf_lookup_addr(struct elf_binary *elf, const char *symbol);
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void elf_parse_bsdsyms(struct elf_binary *elf, uint64_t pstart); /* private */
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/* ------------------------------------------------------------------------ */
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/* xc_libelf_relocate.c */
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int elf_reloc(struct elf_binary *elf);
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/* ------------------------------------------------------------------------ */
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/* xc_libelf_dominfo.c */
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#define UNSET_ADDR ((uint64_t)-1)
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enum xen_elfnote_type {
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XEN_ENT_NONE = 0,
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XEN_ENT_LONG = 1,
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XEN_ENT_STR = 2
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};
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struct xen_elfnote {
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enum xen_elfnote_type type;
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const char *name;
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union {
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const char *str;
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uint64_t num;
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} data;
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};
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struct elf_dom_parms {
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/* raw */
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const char *guest_info;
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const void *elf_note_start;
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const void *elf_note_end;
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struct xen_elfnote elf_notes[XEN_ELFNOTE_MAX + 1];
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/* parsed */
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char guest_os[16];
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char guest_ver[16];
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char xen_ver[16];
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char loader[16];
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int pae;
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int bsd_symtab;
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uint64_t virt_base;
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uint64_t virt_entry;
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uint64_t virt_hypercall;
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uint64_t virt_hv_start_low;
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uint64_t elf_paddr_offset;
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uint32_t f_supported[XENFEAT_NR_SUBMAPS];
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uint32_t f_required[XENFEAT_NR_SUBMAPS];
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/* calculated */
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uint64_t virt_offset;
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uint64_t virt_kstart;
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uint64_t virt_kend;
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};
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static inline void elf_xen_feature_set(int nr, uint32_t * addr)
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{
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addr[nr >> 5] |= 1 << (nr & 31);
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}
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static inline int elf_xen_feature_get(int nr, uint32_t * addr)
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{
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return !!(addr[nr >> 5] & (1 << (nr & 31)));
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}
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int elf_xen_parse_features(const char *features,
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uint32_t *supported,
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uint32_t *required);
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int elf_xen_parse_note(struct elf_binary *elf,
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struct elf_dom_parms *parms,
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const elf_note *note);
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int elf_xen_parse_guest_info(struct elf_binary *elf,
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struct elf_dom_parms *parms);
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int elf_xen_parse(struct elf_binary *elf,
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struct elf_dom_parms *parms);
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#endif /* __XC_LIBELF__ */
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