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/*
* Copyright 2005 Gentoo Foundation
* Distributed under the terms of the GNU General Public License v2
* $Header: /var/cvsroot/gentoo-projects/pax-utils/paxelf.h,v 1.35 2005/09/30 03:30:19 vapier Exp $
*
* Copyright 2005 Ned Ludd - <solar@gentoo.org>
* Copyright 2005 Mike Frysinger - <vapier@gentoo.org>
*
* Make sure all of the common elf stuff is setup as we expect
*/
#ifndef _PAX_ELF_H
#define _PAX_ELF_H
#include "porting.h"
#ifndef VERSION
# define VERSION "cvs"
#endif
extern char do_reverse_endian;
/* Get a value 'X' in the elf header, compensating for endianness. */
#define EGET(X) \
(__extension__ ({ \
uint64_t __res; \
if (!do_reverse_endian) { __res = (X); \
} else if (sizeof(X) == 1) { __res = (X); \
} else if (sizeof(X) == 2) { __res = bswap_16((X)); \
} else if (sizeof(X) == 4) { __res = bswap_32((X)); \
} else if (sizeof(X) == 8) { __res = bswap_64((X)); \
} else { \
fprintf(stderr, "EGET failed ;(\n"); \
exit(EXIT_FAILURE); \
} \
__res; \
}))
typedef struct {
void *ehdr;
void *phdr;
void *shdr;
char *data;
char elf_class;
off_t len;
int fd;
const char *filename;
const char *base_filename;
} elfobj;
#define EHDR32(ptr) ((Elf32_Ehdr *)(ptr))
#define EHDR64(ptr) ((Elf64_Ehdr *)(ptr))
#define PHDR32(ptr) ((Elf32_Phdr *)(ptr))
#define PHDR64(ptr) ((Elf64_Phdr *)(ptr))
#define SHDR32(ptr) ((Elf32_Shdr *)(ptr))
#define SHDR64(ptr) ((Elf64_Shdr *)(ptr))
#define RELA32(ptr) ((Elf32_Rela *)(ptr))
#define RELA64(ptr) ((Elf64_Rela *)(ptr))
#define REL32(ptr) ((Elf32_Rel *)(ptr))
#define REL64(ptr) ((Elf64_Rel *)(ptr))
#define DYN32(ptr) ((Elf32_Dyn *)(ptr))
#define DYN64(ptr) ((Elf64_Dyn *)(ptr))
#define SYM32(ptr) ((Elf32_Sym *)(ptr))
#define SYM64(ptr) ((Elf64_Sym *)(ptr))
/* prototypes */
extern char *pax_short_hf_flags(unsigned long flags);
extern char *pax_short_pf_flags(unsigned long flags);
extern char *gnu_short_stack_flags(unsigned long flags);
extern elfobj *readelf(const char *filename);
extern void unreadelf(elfobj *elf);
extern const char *get_elfeitype(int ei_type, int type);
extern const char *get_elfetype(elfobj *elf);
extern const char *get_elfemtype(int type);
extern const char *get_elfptype(int type);
extern const char *get_elfdtype(int type);
extern const char *get_elfshttype(int type);
extern const char *get_elfstttype(int type);
extern void *elf_findsecbyname(elfobj *elf, const char *name);
/* helper functions for showing errors */
#define color 1
#define COLOR(c,b) (color ? "\e[" c ";" b "m" : "")
#define NORM COLOR("00", "00")
#define RED COLOR("31", "01")
#define YELLOW COLOR("33", "01")
/* we need the space before the last comma or we trigger a bug in gcc-2 :( */
#define warn(fmt, args...) \
fprintf(stderr, "%s%s%s: " fmt "\n", RED, argv0, NORM , ## args)
#define warnf(fmt, args...) warn("%s%s%s(): " fmt, YELLOW, __FUNCTION__, NORM , ## args)
#define _err(wfunc, fmt, args...) \
do { \
wfunc(fmt, ## args); \
exit(EXIT_FAILURE); \
} while (0)
#define err(fmt, args...) _err(warn, fmt, ## args)
#define errf(fmt, args...) _err(warnf, fmt, ## args)
/* PaX flags (to be read in elfhdr.e_flags) */
#define HF_PAX_PAGEEXEC 1 /* 0: Paging based non-exec pages */
#define HF_PAX_EMUTRAMP 2 /* 0: Emulate trampolines */
#define HF_PAX_MPROTECT 4 /* 0: Restrict mprotect() */
#define HF_PAX_RANDMMAP 8 /* 0: Randomize mmap() base */
#define HF_PAX_RANDEXEC 16 /* 1: Randomize ET_EXEC base */
#define HF_PAX_SEGMEXEC 32 /* 0: Segmentation based non-exec pages */
#define EI_PAX 14 /* Index in e_ident[] where to read flags */
#define __EI_PAX_FLAGS(B, elf) \
((EHDR ## B (elf->ehdr)->e_ident[EI_PAX + 1] << 8) + \
EHDR ## B (elf->ehdr)->e_ident[EI_PAX])
#define EI_PAX_FLAGS(elf) \
(__extension__ ({ \
unsigned long __res; \
if (elf->elf_class == ELFCLASS32) \
__res = __EI_PAX_FLAGS(32, elf); \
else \
__res = __EI_PAX_FLAGS(64, elf); \
__res; \
}))
#endif /* _PAX_ELF_H */
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