binfmt_elfo32.c

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/*
 * 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 ([email protected])
 * Copyright (C) 1995, 1996, 1997, 1998 Jakub Jelinek   ([email protected])
 */

#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 ([email protected])");

#undef MODULE_DESCRIPTION
#undef MODULE_AUTHOR

#undef TASK_SIZE
#define TASK_SIZE TASK_SIZE32

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