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binfmt_elfn32.c

/*
 * Support for n32 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 long 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) ||                 \
          ((__h->e_flags & EF_MIPS_ABI) != 0))              \
            __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>
#include <linux/module.h>
#include <linux/elfcore.h>
#include <linux/compat.h>
#include <linux/math64.h>

#define elf_prstatus elf_prstatus32
00060 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
00079 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_elfn32_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;
}

#define ELF_CORE_EFLAGS EF_MIPS_ABI2

MODULE_DESCRIPTION("Binary format loader for compatibility with n32 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"

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