/*
   * Support for o32 Linux/MIPS ELF binaries.
   *
   * Copyright (C) 1999, 2001 Ralf Baechle
   * Copyright (C) 1999, 2001 Silicon Graphics, Inc.
   *
   * Heavily inspired by the 32-bit Sparc compat code which is
   * Copyright (C) 1995, 1996, 1997, 1998 David S. Miller (davem@redhat.com)
   * Copyright (C) 1995, 1996, 1997, 1998 Jakub Jelinek   (jj@ultra.linux.cz)
   */
  
  #define ELF_ARCH		EM_MIPS
  #define ELF_CLASS		ELFCLASS32
  #ifdef __MIPSEB__
  #define ELF_DATA		ELFDATA2MSB;
  #else /* __MIPSEL__ */
  #define ELF_DATA		ELFDATA2LSB;
  #endif
  
  /* ELF register definitions */
  #define ELF_NGREG	45
  #define ELF_NFPREG	33
  
  typedef unsigned int elf_greg_t;
  typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  
  typedef double elf_fpreg_t;
  typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
  
  /*
   * This is used to ensure we don't load something for the wrong architecture.
   */
  #define elf_check_arch(hdr)						\
  ({									\
  	int __res = 1;							\
  	struct elfhdr *__h = (hdr);					\
  									\
  	if (__h->e_machine != EM_MIPS)					\
  		__res = 0;						\
  	if (__h->e_ident[EI_CLASS] != ELFCLASS32)			\
  		__res = 0;						\
  	if ((__h->e_flags & EF_MIPS_ABI2) != 0)				\
  		__res = 0;						\
  	if (((__h->e_flags & EF_MIPS_ABI) != 0) &&			\
  	    ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32))		\
  		__res = 0;						\
  									\
  	__res;								\
  })
  
  #define TASK32_SIZE		0x7fff8000UL
  #undef ELF_ET_DYN_BASE
  #define ELF_ET_DYN_BASE         (TASK32_SIZE / 3 * 2)
  
  #include <asm/processor.h>

  
  /*
   * When this file is selected, we are definitely running a 64bit kernel.
   * So using the right regs define in asm/reg.h
   */
  #define WANT_COMPAT_REG_H
  
  /* These MUST be defined before elf.h gets included */
  extern void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs);
  #define ELF_CORE_COPY_REGS(_dest, _regs) elf32_core_copy_regs(_dest, _regs);
  #define ELF_CORE_COPY_TASK_REGS(_tsk, _dest)				\
  ({									\
  	int __res = 1;							\
  	elf32_core_copy_regs(*(_dest), task_pt_regs(_tsk));		\
  	__res;								\
  })

  #include <linux/module.h>

  #include <linux/elfcore.h>
  #include <linux/compat.h>

  #include <linux/math64.h>

  
  #define elf_prstatus elf_prstatus32
  struct elf_prstatus32
  {
  	struct elf_siginfo pr_info;	/* Info associated with signal */
  	short	pr_cursig;		/* Current signal */
  	unsigned int pr_sigpend;	/* Set of pending signals */
  	unsigned int pr_sighold;	/* Set of held signals */
  	pid_t	pr_pid;
  	pid_t	pr_ppid;
  	pid_t	pr_pgrp;
  	pid_t	pr_sid;
  	struct compat_timeval pr_utime;	/* User time */
  	struct compat_timeval pr_stime;	/* System time */
  	struct compat_timeval pr_cutime;/* Cumulative user time */
  	struct compat_timeval pr_cstime;/* Cumulative system time */
  	elf_gregset_t pr_reg;	/* GP registers */
  	int pr_fpvalid;		/* True if math co-processor being used.  */
  };
  
  #define elf_prpsinfo elf_prpsinfo32
  struct elf_prpsinfo32
  {
  	char	pr_state;	/* numeric process state */
  	char	pr_sname;	/* char for pr_state */
  	char	pr_zomb;	/* zombie */
  	char	pr_nice;	/* nice val */
  	unsigned int pr_flag;	/* flags */
  	__kernel_uid_t	pr_uid;
  	__kernel_gid_t	pr_gid;
  	pid_t	pr_pid, pr_ppid, pr_pgrp, pr_sid;
  	/* Lots missing */
  	char	pr_fname[16];	/* filename of executable */
  	char	pr_psargs[ELF_PRARGSZ];	/* initial part of arg list */
  };

  #define elf_caddr_t	u32
  #define init_elf_binfmt init_elf32_binfmt
  
  #define jiffies_to_timeval jiffies_to_compat_timeval

  static inline void

  jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
  {
  	/*

  	 * Convert jiffies to nanoseconds and separate with

  	 * one divide.
  	 */

  	u64 nsec = (u64)jiffies * TICK_NSEC;

  	u32 rem;
  	value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);

  	value->tv_usec = rem / NSEC_PER_USEC;

  }

  void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)

  {
  	int i;

  	for (i = 0; i < EF_R0; i++)
  		grp[i] = 0;
  	grp[EF_R0] = 0;
  	for (i = 1; i <= 31; i++)
  		grp[EF_R0 + i] = (elf_greg_t) regs->regs[i];
  	grp[EF_R26] = 0;
  	grp[EF_R27] = 0;
  	grp[EF_LO] = (elf_greg_t) regs->lo;
  	grp[EF_HI] = (elf_greg_t) regs->hi;
  	grp[EF_CP0_EPC] = (elf_greg_t) regs->cp0_epc;
  	grp[EF_CP0_BADVADDR] = (elf_greg_t) regs->cp0_badvaddr;
  	grp[EF_CP0_STATUS] = (elf_greg_t) regs->cp0_status;
  	grp[EF_CP0_CAUSE] = (elf_greg_t) regs->cp0_cause;
  #ifdef EF_UNUSED0
  	grp[EF_UNUSED0] = 0;
  #endif

  }
  
  MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
  MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
  
  #undef MODULE_DESCRIPTION
  #undef MODULE_AUTHOR

  #undef TASK_SIZE
  #define TASK_SIZE TASK_SIZE32

  #include "../../../fs/binfmt_elf.c"