LXR linux/arch/mips/kernel/binfmt

   1/*
   2 * Support for o32 Linux/MIPS ELF binaries.
   3 *
   4 * Copyright (C) 1999, 2001 Ralf Baechle
   5 * Copyright (C) 1999, 2001 Silicon Graphics, Inc.
   6 *
   7 * Heavily inspired by the 32-bit Sparc compat code which is
   8 * Copyright (C) 1995, 1996, 1997, 1998 David S. Miller (davem@redhat.com)
   9 * Copyright (C) 1995, 1996, 1997, 1998 Jakub Jelinek   (jj@ultra.linux.cz)
  10 */
  11
  12#define ELF_ARCH                EM_MIPS
  13#define ELF_CLASS               ELFCLASS32
  14#ifdef __MIPSEB__
  15#define ELF_DATA                ELFDATA2MSB;
  16#else /* __MIPSEL__ */
  17#define ELF_DATA                ELFDATA2LSB;
  18#endif
  19
  20/* ELF register definitions */
  21#define ELF_NGREG       45
  22#define ELF_NFPREG      33
  23
  24typedef unsigned int elf_greg_t;
  25typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  26
  27typedef double elf_fpreg_t;
  28typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
  29
  30/*
  31 * This is used to ensure we don't load something for the wrong architecture.
  32 */
  33#define elf_check_arch(hdr)                                             \
  34({                                                                      \
  35        int __res = 1;                                                  \
  36        struct elfhdr *__h = (hdr);                                     \
  37                                                                        \
  38        if (__h->e_machine != EM_MIPS)                                  \
  39                __res = 0;                                              \
  40        if (__h->e_ident[EI_CLASS] != ELFCLASS32)                       \
  41                __res = 0;                                              \
  42        if ((__h->e_flags & EF_MIPS_ABI2) != 0)                         \
  43                __res = 0;                                              \
  44        if (((__h->e_flags & EF_MIPS_ABI) != 0) &&                      \
  45            ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32))          \
  46                __res = 0;                                              \
  47                                                                        \
  48        __res;                                                          \
  49})
  50
  51#define TASK32_SIZE             0x7fff8000UL
  52#undef ELF_ET_DYN_BASE
  53#define ELF_ET_DYN_BASE         (TASK32_SIZE / 3 * 2)
  54
  55#include <asm/processor.h>
  56
  57/*
  58 * When this file is selected, we are definitely running a 64bit kernel.
  59 * So using the right regs define in asm/reg.h
  60 */
  61#define WANT_COMPAT_REG_H
  62
  63/* These MUST be defined before elf.h gets included */
  64extern void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs);
  65#define ELF_CORE_COPY_REGS(_dest, _regs) elf32_core_copy_regs(_dest, _regs);
  66#define ELF_CORE_COPY_TASK_REGS(_tsk, _dest)                            \
  67({                                                                      \
  68        int __res = 1;                                                  \
  69        elf32_core_copy_regs(*(_dest), task_pt_regs(_tsk));             \
  70        __res;                                                          \
  71})
  72
  73#include <linux/module.h>
  74#include <linux/elfcore.h>
  75#include <linux/compat.h>
  76#include <linux/math64.h>
  77
  78#define elf_prstatus elf_prstatus32
  79struct elf_prstatus32
  80{
  81        struct elf_siginfo pr_info;     /* Info associated with signal */
  82        short   pr_cursig;              /* Current signal */
  83        unsigned int pr_sigpend;        /* Set of pending signals */
  84        unsigned int pr_sighold;        /* Set of held signals */
  85        pid_t   pr_pid;
  86        pid_t   pr_ppid;
  87        pid_t   pr_pgrp;
  88        pid_t   pr_sid;
  89        struct compat_timeval pr_utime; /* User time */
  90        struct compat_timeval pr_stime; /* System time */
  91        struct compat_timeval pr_cutime;/* Cumulative user time */
  92        struct compat_timeval pr_cstime;/* Cumulative system time */
  93        elf_gregset_t pr_reg;   /* GP registers */
  94        int pr_fpvalid;         /* True if math co-processor being used.  */
  95};
  96
  97#define elf_prpsinfo elf_prpsinfo32
  98struct elf_prpsinfo32
  99{
 100        char    pr_state;       /* numeric process state */
 101        char    pr_sname;       /* char for pr_state */
 102        char    pr_zomb;        /* zombie */
 103        char    pr_nice;        /* nice val */
 104        unsigned int pr_flag;   /* flags */
 105        __kernel_uid_t  pr_uid;
 106        __kernel_gid_t  pr_gid;
 107        pid_t   pr_pid, pr_ppid, pr_pgrp, pr_sid;
 108        /* Lots missing */
 109        char    pr_fname[16];   /* filename of executable */
 110        char    pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
 111};
 112
 113#define elf_caddr_t     u32
 114#define init_elf_binfmt init_elf32_binfmt
 115
 116#define jiffies_to_timeval jiffies_to_compat_timeval
 117static inline void
 118jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
 119{
 120        /*
 121         * Convert jiffies to nanoseconds and separate with
 122         * one divide.
 123         */
 124        u64 nsec = (u64)jiffies * TICK_NSEC;
 125        u32 rem;
 126        value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
 127        value->tv_usec = rem / NSEC_PER_USEC;
 128}
 129
 130void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)
 131{
 132        int i;
 133
 134        for (i = 0; i < EF_R0; i++)
 135                grp[i] = 0;
 136        grp[EF_R0] = 0;
 137        for (i = 1; i <= 31; i++)
 138                grp[EF_R0 + i] = (elf_greg_t) regs->regs[i];
 139        grp[EF_R26] = 0;
 140        grp[EF_R27] = 0;
 141        grp[EF_LO] = (elf_greg_t) regs->lo;
 142        grp[EF_HI] = (elf_greg_t) regs->hi;
 143        grp[EF_CP0_EPC] = (elf_greg_t) regs->cp0_epc;
 144        grp[EF_CP0_BADVADDR] = (elf_greg_t) regs->cp0_badvaddr;
 145        grp[EF_CP0_STATUS] = (elf_greg_t) regs->cp0_status;
 146        grp[EF_CP0_CAUSE] = (elf_greg_t) regs->cp0_cause;
 147#ifdef EF_UNUSED0
 148        grp[EF_UNUSED0] = 0;
 149#endif
 150}
 151
 152MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
 153MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
 154
 155#undef MODULE_DESCRIPTION
 156#undef MODULE_AUTHOR
 157
 158#undef TASK_SIZE
 159#define TASK_SIZE TASK_SIZE32
 160
 161#include "../../../fs/binfmt_elf.c"
 162