elf.h

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/* MN10300 ELF constant and register definitions
 *
 * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#ifndef _ASM_ELF_H
#define _ASM_ELF_H

#include <linux/utsname.h>
#include <asm/ptrace.h>
#include <asm/user.h>

/*
 * AM33 relocations
 */
#define R_MN10300_NONE      0   /* No reloc.  */
#define R_MN10300_32        1   /* Direct 32 bit.  */
#define R_MN10300_16        2   /* Direct 16 bit.  */
#define R_MN10300_8     3   /* Direct 8 bit.  */
#define R_MN10300_PCREL32   4   /* PC-relative 32-bit.  */
#define R_MN10300_PCREL16   5   /* PC-relative 16-bit signed.  */
#define R_MN10300_PCREL8    6   /* PC-relative 8-bit signed.  */
#define R_MN10300_24        9   /* Direct 24 bit.  */
#define R_MN10300_RELATIVE  23  /* Adjust by program base.  */
#define R_MN10300_SYM_DIFF  33  /* Adjustment when relaxing. */
#define R_MN10300_ALIGN     34  /* Alignment requirement. */

/*
 * AM33/AM34 HW Capabilities
 */
#define HWCAP_MN10300_ATOMIC_OP_UNIT    1   /* Has AM34 Atomic Operations */


/*
 * ELF register definitions..
 */
typedef unsigned long elf_greg_t;

#define ELF_NGREG ((sizeof(struct pt_regs) / sizeof(elf_greg_t)) - 1)
typedef elf_greg_t elf_gregset_t[ELF_NGREG];

#define ELF_NFPREG 32
typedef float elf_fpreg_t;

typedef struct {
    elf_fpreg_t fpregs[ELF_NFPREG];
    u_int32_t   fpcr;
} elf_fpregset_t;

/*
 * This is used to ensure we don't load something for the wrong architecture
 */
#define elf_check_arch(x) \
    (((x)->e_machine == EM_CYGNUS_MN10300) ||   \
     ((x)->e_machine == EM_MN10300))

/*
 * These are used to set parameters in the core dumps.
 */
#define ELF_CLASS   ELFCLASS32
#define ELF_DATA    ELFDATA2LSB
#define ELF_ARCH    EM_MN10300

/*
 * ELF process initialiser
 */
#define ELF_PLAT_INIT(_r, load_addr)                    \
do {                                    \
    struct pt_regs *_ur = current->thread.uregs;            \
    _ur->a3   = 0;  _ur->a2   = 0;  _ur->d3   = 0;  _ur->d2   = 0;  \
    _ur->mcvf = 0;  _ur->mcrl = 0;  _ur->mcrh = 0;  _ur->mdrq = 0;  \
    _ur->e1   = 0;  _ur->e0   = 0;  _ur->e7   = 0;  _ur->e6   = 0;  \
    _ur->e5   = 0;  _ur->e4   = 0;  _ur->e3   = 0;  _ur->e2   = 0;  \
    _ur->lar  = 0;  _ur->lir  = 0;  _ur->mdr  = 0;          \
    _ur->a1   = 0;  _ur->a0   = 0;  _ur->d1   = 0;  _ur->d0   = 0;  \
} while (0)

#define CORE_DUMP_USE_REGSET
#define ELF_EXEC_PAGESIZE   4096

/*
 * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 * use of this is to invoke "./ld.so someprog" to test out a new version of
 * the loader.  We need to make sure that it is out of the way of the program
 * that it will "exec", and that there is sufficient room for the brk.
 * - must clear the VMALLOC area
 */
#define ELF_ET_DYN_BASE         0x04000000

/*
 * regs is struct pt_regs, pr_reg is elf_gregset_t (which is
 * now struct user_regs, they are different)
 * - ELF_CORE_COPY_REGS has been guessed, and may be wrong
 */
#define ELF_CORE_COPY_REGS(pr_reg, regs)    \
do {                        \
    pr_reg[0]   = regs->a3;     \
    pr_reg[1]   = regs->a2;     \
    pr_reg[2]   = regs->d3;     \
    pr_reg[3]   = regs->d2;     \
    pr_reg[4]   = regs->mcvf;       \
    pr_reg[5]   = regs->mcrl;       \
    pr_reg[6]   = regs->mcrh;       \
    pr_reg[7]   = regs->mdrq;       \
    pr_reg[8]   = regs->e1;     \
    pr_reg[9]   = regs->e0;     \
    pr_reg[10]  = regs->e7;     \
    pr_reg[11]  = regs->e6;     \
    pr_reg[12]  = regs->e5;     \
    pr_reg[13]  = regs->e4;     \
    pr_reg[14]  = regs->e3;     \
    pr_reg[15]  = regs->e2;     \
    pr_reg[16]  = regs->sp;     \
    pr_reg[17]  = regs->lar;        \
    pr_reg[18]  = regs->lir;        \
    pr_reg[19]  = regs->mdr;        \
    pr_reg[20]  = regs->a1;     \
    pr_reg[21]  = regs->a0;     \
    pr_reg[22]  = regs->d1;     \
    pr_reg[23]  = regs->d0;     \
    pr_reg[24]  = regs->orig_d0;    \
    pr_reg[25]  = regs->epsw;       \
    pr_reg[26]  = regs->pc;     \
} while (0);

/*
 * This yields a mask that user programs can use to figure out what
 * instruction set this CPU supports.  This could be done in user space,
 * but it's not easy, and we've already done it here.
 */
#ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
#define ELF_HWCAP   (HWCAP_MN10300_ATOMIC_OP_UNIT)
#else
#define ELF_HWCAP   (0)
#endif

/*
 * This yields a string that ld.so will use to load implementation
 * specific libraries for optimization.  This is more specific in
 * intent than poking at uname or /proc/cpuinfo.
 *
 * For the moment, we have only optimizations for the Intel generations,
 * but that could change...
 */
#define ELF_PLATFORM  (NULL)

#ifdef __KERNEL__
#define SET_PERSONALITY(ex) \
    set_personality(PER_LINUX | (current->personality & (~PER_MASK)))
#endif

#endif /* _ASM_ELF_H */