criu/compel/arch/mips/src/lib/include/ldsodefs.h

/*
 * Run-time dynamic linker data structures for loaded ELF shared objects.
 * Copyright (C) 2000-2014 Free Software Foundation, Inc.
 * This file is part of the GNU C Library.
 *
 * The GNU C Library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * The GNU C Library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the GNU C Library.  If not, see
 * <http://www.gnu.org/licenses/>.
 */

#ifndef _MIPS_LDSODEFS_H
#define _MIPS_LDSODEFS_H 1

#include <elf.h>

struct La_mips_32_regs;
struct La_mips_32_retval;
struct La_mips_64_regs;
struct La_mips_64_retval;

#define ARCH_PLTENTER_MEMBERS                                                                           \
	Elf32_Addr (*mips_o32_gnu_pltenter)(Elf32_Sym *, unsigned int, uintptr_t *, uintptr_t *,        \
					    struct La_mips_32_regs *, unsigned int *, const char *name, \
					    long int *framesizep);                                      \
	Elf32_Addr (*mips_n32_gnu_pltenter)(Elf32_Sym *, unsigned int, uintptr_t *, uintptr_t *,        \
					    struct La_mips_64_regs *, unsigned int *, const char *name, \
					    long int *framesizep);                                      \
	Elf64_Addr (*mips_n64_gnu_pltenter)(Elf64_Sym *, unsigned int, uintptr_t *, uintptr_t *,        \
					    struct La_mips_64_regs *, unsigned int *, const char *name, \
					    long int *framesizep);

#define ARCH_PLTEXIT_MEMBERS                                                                             \
	unsigned int (*mips_o32_gnu_pltexit)(Elf32_Sym *, unsigned int, uintptr_t *, uintptr_t *,        \
					     const struct La_mips_32_regs *, struct La_mips_32_retval *, \
					     const char *);                                              \
	unsigned int (*mips_n32_gnu_pltexit)(Elf32_Sym *, unsigned int, uintptr_t *, uintptr_t *,        \
					     const struct La_mips_64_regs *, struct La_mips_64_retval *, \
					     const char *);                                              \
	unsigned int (*mips_n64_gnu_pltexit)(Elf64_Sym *, unsigned int, uintptr_t *, uintptr_t *,        \
					     const struct La_mips_64_regs *, struct La_mips_64_retval *, \
					     const char *);

/* The MIPS ABI specifies that the dynamic section has to be read-only.  */

/*
 * The 64-bit MIPS ELF ABI uses an unusual reloc format.  Each
 * relocation entry specifies up to three actual relocations, all at
 * the same address.  The first relocation which required a symbol
 * uses the symbol in the r_sym field.  The second relocation which
 * requires a symbol uses the symbol in the r_ssym field.  If all
 * three relocations require a symbol, the third one uses a zero
 * value.
 *
 * We define these structures in internal headers because we're not
 * sure we want to make them part of the ABI yet.  Eventually, some of
 * this may move into elf/elf.h.
 */

/* An entry in a 64 bit SHT_REL section.  */

typedef struct {
	Elf32_Word r_sym; /* Symbol index */
	unsigned char r_ssym; /* Special symbol for 2nd relocation */
	unsigned char r_type3; /* 3rd relocation type */
	unsigned char r_type2; /* 2nd relocation type */
	unsigned char r_type1; /* 1st relocation type */
} _Elf64_Mips_R_Info;

typedef union {
	Elf64_Xword r_info_number;
	_Elf64_Mips_R_Info r_info_fields;
} _Elf64_Mips_R_Info_union;

typedef struct {
	Elf64_Addr r_offset; /* Address */
	_Elf64_Mips_R_Info_union r_info; /* Relocation type and symbol index */
} Elf64_Mips_Rel;

typedef struct {
	Elf64_Addr r_offset; /* Address */
	_Elf64_Mips_R_Info_union r_info; /* Relocation type and symbol index */
	Elf64_Sxword r_addend; /* Addend */
} Elf64_Mips_Rela;

#define ELF64_MIPS_R_SYM(i) ((__extension__(_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym)

#define ELF64_MIPS_R_TYPE(i)                                                                      \
	(((_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1 |                                  \
	 ((Elf32_Word)(__extension__(_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type2 << 8) |  \
	 ((Elf32_Word)(__extension__(_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type3 << 16) | \
	 ((Elf32_Word)(__extension__(_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_ssym << 24))

#define ELF64_MIPS_R_INFO(sym, type)                                                                          \
	(__extension__(_Elf64_Mips_R_Info_union)(                                                             \
		 __extension__(_Elf64_Mips_R_Info){ (sym), ELF64_MIPS_R_SSYM(type), ELF64_MIPS_R_TYPE3(type), \
						    ELF64_MIPS_R_TYPE2(type), ELF64_MIPS_R_TYPE1(type) })     \
		 .r_info_number)

/*
 * These macros decompose the value returned by ELF64_MIPS_R_TYPE, and
 * compose it back into a value that it can be used as an argument to
 * ELF64_MIPS_R_INFO.
 */
#define ELF64_MIPS_R_SSYM(i)  (((i) >> 24) & 0xff)
#define ELF64_MIPS_R_TYPE3(i) (((i) >> 16) & 0xff)
#define ELF64_MIPS_R_TYPE2(i) (((i) >> 8) & 0xff)
#define ELF64_MIPS_R_TYPE1(i) ((i)&0xff)
#define ELF64_MIPS_R_TYPEENC(type1, type2, type3, ssym) \
	((type1) | ((Elf32_Word)(type2) << 8) | ((Elf32_Word)(type3) << 16) | ((Elf32_Word)(ssym) << 24))

#undef ELF64_R_SYM
#define ELF64_R_SYM(i) ELF64_MIPS_R_SYM(i)
#undef ELF64_R_TYPE

/*fixme*/
#define ELF64_R_TYPE(i) (ELF64_MIPS_R_TYPE(i) & 0x00ff)
#undef ELF64_R_INFO
#define ELF64_R_INFO(sym, type) ELF64_MIPS_R_INFO((sym), (type))

#endif