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