powerpc/include/elf.h

/*-
 * Copyright (c) 2001 David E. O'Brien
 * Copyright (c) 1996-1997 John D. Polstra.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD: head/sys/powerpc/include/elf.h 84783 2001-10-10 23:06:54Z ps $
 */

#ifndef _MACHINE_ELF_H_
#define	_MACHINE_ELF_H_ 1

/*
 * EABI ELF definitions for the PowerPC architecture.
 * See "PowerPC Embedded Application Binary Interface, 32-Bit Impliementation"
 * [ppc-eabi-1995-01.pdf] for details.
 */

#include <sys/elf32.h>	/* Definitions common to all 32 bit architectures. */

#define	__ELF_WORD_SIZE	32	/* Used by <sys/elf_generic.h> */
#include <sys/elf_generic.h>

#define	ELF_ARCH	EM_PPC

#define	ELF_MACHINE_OK(x) ((x) == EM_PPC)

/*
 * Auxiliary vector entries for passing information to the interpreter.
 *
 * The PowerPC supplement to the SVR4 ABI specification names this "auxv_t",
 * but POSIX lays claim to all symbols ending with "_t".
 */

typedef struct {	/* Auxiliary vector entry on initial stack */
	int	a_type;			/* Entry type. */
	union {
		long	a_val;		/* Integer value. */
		void	*a_ptr;		/* Address. */
		void	(*a_fcn)(void);	/* Function pointer (not used). */
	} a_un;
} Elf32_Auxinfo;

__ElfType(Auxinfo);

/*
 * Types of dynamic symbol hash table bucket and chain elements.
 *
 * This is inconsistent among 64 bit architectures, so a machine dependent
 * typedef is required.
 */

typedef Elf32_Off Elf32_Hashelt;

__ElfType(Hashelt);

/* Values for a_type. */
#define	AT_NULL		0	/* Terminates the vector. */
#define	AT_IGNORE	1	/* Ignored entry. */
#define	AT_EXECFD	2	/* File descriptor of program to load. */
#define	AT_PHDR		3	/* Program header of program already loaded. */
#define	AT_PHENT	4	/* Size of each program header entry. */
#define	AT_PHNUM	5	/* Number of program header entries. */
#define	AT_PAGESZ	6	/* Page size in bytes. */
#define	AT_BASE		7	/* Interpreter's base address. */
#define	AT_FLAGS	8	/* Flags (unused for PowerPC). */
#define	AT_ENTRY	9	/* Where interpreter should transfer control. */
#define	AT_DCACHEBSIZE	10	/* Data cache block size for the processor. */
#define	AT_ICACHEBSIZE	11	/* Instruction cache block size for the uP. */
#define	AT_UCACHEBSIZE	12	/* Cache block size, or `0' if cache not unified. */

#define	AT_COUNT	13	/* Count of defined aux entry types. */

/* Used in John Polstra's testbed stuff. */
#define	AT_DEBUG	14	/* Debugging level. */

/*
 * Relocation types.
 */

#define	R_PPC_NONE		0	/* No relocation. */
#define	R_PPC_ADDR32		1
#define	R_PPC_ADDR24		2
#define	R_PPC_ADDR16		3
#define	R_PPC_ADDR16_LO		4
#define	R_PPC_ADDR16_HI		5
#define	R_PPC_ADDR16_HA		6
#define	R_PPC_ADDR14		7
#define	R_PPC_ADDR14_BRTAKEN	8
#define	R_PPC_ADDR14_BRNTAKEN	9
#define	R_PPC_REL24		10
#define	R_PPC_REL14		11
#define	R_PPC_REL14_BRTAKEN	12
#define	R_PPC_REL14_BRNTAKEN	13
#define	R_PPC_GOT16		14
#define	R_PPC_GOT16_LO		15
#define	R_PPC_GOT16_HI		16
#define	R_PPC_GOT16_HA		17
#define	R_PPC_PLTREL24		18
#define	R_PPC_COPY		19
#define	R_PPC_GLOB_DAT		20
#define	R_PPC_JMP_SLOT		21
#define	R_PPC_RELATIVE		22
#define	R_PPC_LOCAL24PC		23
#define	R_PPC_UADDR32		24
#define	R_PPC_UADDR16		25
#define	R_PPC_REL32		26
#define	R_PPC_PLT32		27
#define	R_PPC_PLTREL32		28
#define	R_PPC_PLT16_LO		29
#define	R_PPC_PLT16_HI		30
#define	R_PPC_PLT16_HA		31
#define	R_PPC_SDAREL16		32
#define	R_PPC_SECTOFF		33
#define	R_PPC_SECTOFF_LO	34
#define	R_PPC_SECTOFF_HI	35
#define	R_PPC_SECTOFF_HA	36

#define	R_PPC_COUNT		37	/* Count of defined relocation types. */

/*
 * The remaining relocs are from the Embedded ELF ABI, and are not in the
 *  SVR4 ELF ABI.
 */

#define	R_PPC_EMB_NADDR32	101
#define	R_PPC_EMB_NADDR16	102
#define	R_PPC_EMB_NADDR16_LO	103
#define	R_PPC_EMB_NADDR16_HI	104
#define	R_PPC_EMB_NADDR16_HA	105
#define	R_PPC_EMB_SDAI16	106
#define	R_PPC_EMB_SDA2I16	107
#define	R_PPC_EMB_SDA2REL	108
#define	R_PPC_EMB_SDA21		109
#define	R_PPC_EMB_MRKREF	110
#define	R_PPC_EMB_RELSEC16	111
#define	R_PPC_EMB_RELST_LO	112
#define	R_PPC_EMB_RELST_HI	113
#define	R_PPC_EMB_RELST_HA	114
#define	R_PPC_EMB_BIT_FLD	115
#define	R_PPC_EMB_RELSDA	116

					/* Count of defined relocation types. */
#define	R_PPC_EMB_COUNT		(R_PPC_EMB_RELSDA - R_PPC_EMB_NADDR32 + 1)

/* Define "machine" characteristics */
#define	ELF_TARG_CLASS	ELFCLASS32
#define	ELF_TARG_DATA	ELFDATA2MSB
#define	ELF_TARG_MACH	EM_PPC
#define	ELF_TARG_VER	1

#ifdef _KERNEL

/*
 * On the PowerPC we load the dynamic linker where a userland call
 * to mmap(0, ...) would put it.  The rationale behind this
 * calculation is that it leaves room for the heap to grow to
 * its maximum allowed size.
 */
#define	ELF_RTLD_ADDR(vmspace) \
    (round_page((vm_offset_t)(vmspace)->vm_daddr + maxdsiz))

#endif /* _KERNEL */
#endif /* !_MACHINE_ELF_H_ */