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 * In order to be sure that we don't attempt to execute an O32 binary which
  32 * requires 64 bit FP (FR=1) on a system which does not support it we refuse
  33 * to execute any binary which has bits specified by the following macro set
  34 * in its ELF header flags.
  35 */
  36#ifdef CONFIG_MIPS_O32_FP64_SUPPORT
  37# define __MIPS_O32_FP64_MUST_BE_ZERO   0
  38#else
  39# define __MIPS_O32_FP64_MUST_BE_ZERO   EF_MIPS_FP64
  40#endif
  41
  42/*
  43 * This is used to ensure we don't load something for the wrong architecture.
  44 */
  45#define elf_check_arch(hdr)                                             \
  46({                                                                      \
  47        int __res = 1;                                                  \
  48        struct elfhdr *__h = (hdr);                                     \
  49                                                                        \
  50        if (__h->e_machine != EM_MIPS)                                  \
  51                __res = 0;                                              \
  52        if (__h->e_ident[EI_CLASS] != ELFCLASS32)                       \
  53                __res = 0;                                              \
  54        if ((__h->e_flags & EF_MIPS_ABI2) != 0)                         \
  55                __res = 0;                                              \
  56        if (((__h->e_flags & EF_MIPS_ABI) != 0) &&                      \
  57            ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32))          \
  58                __res = 0;                                              \
  59        if (__h->e_flags & __MIPS_O32_FP64_MUST_BE_ZERO)                \
  60                __res = 0;                                              \
  61                                                                        \
  62        __res;                                                          \
  63})
  64
  65#ifdef CONFIG_KVM_GUEST
  66#define TASK32_SIZE             0x3fff8000UL
  67#else
  68#define TASK32_SIZE             0x7fff8000UL
  69#endif
  70#undef ELF_ET_DYN_BASE
  71#define ELF_ET_DYN_BASE         (TASK32_SIZE / 3 * 2)
  72
  73#include <asm/processor.h>
  74
  75/*
  76 * When this file is selected, we are definitely running a 64bit kernel.
  77 * So using the right regs define in asm/reg.h
  78 */
  79#define WANT_COMPAT_REG_H
  80
  81/* These MUST be defined before elf.h gets included */
  82extern void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs);
  83#define ELF_CORE_COPY_REGS(_dest, _regs) elf32_core_copy_regs(_dest, _regs);
  84#define ELF_CORE_COPY_TASK_REGS(_tsk, _dest)                            \
  85({                                                                      \
  86        int __res = 1;                                                  \
  87        elf32_core_copy_regs(*(_dest), task_pt_regs(_tsk));             \
  88        __res;                                                          \
  89})
  90
  91#include <linux/module.h>
  92#include <linux/elfcore.h>
  93#include <linux/compat.h>
  94#include <linux/math64.h>
  95
  96#define elf_prstatus elf_prstatus32
  97struct elf_prstatus32
  98{
  99        struct elf_siginfo pr_info;     /* Info associated with signal */
 100        short   pr_cursig;              /* Current signal */
 101        unsigned int pr_sigpend;        /* Set of pending signals */
 102        unsigned int pr_sighold;        /* Set of held signals */
 103        pid_t   pr_pid;
 104        pid_t   pr_ppid;
 105        pid_t   pr_pgrp;
 106        pid_t   pr_sid;
 107        struct compat_timeval pr_utime; /* User time */
 108        struct compat_timeval pr_stime; /* System time */
 109        struct compat_timeval pr_cutime;/* Cumulative user time */
 110        struct compat_timeval pr_cstime;/* Cumulative system time */
 111        elf_gregset_t pr_reg;   /* GP registers */
 112        int pr_fpvalid;         /* True if math co-processor being used.  */
 113};
 114
 115#define elf_prpsinfo elf_prpsinfo32
 116struct elf_prpsinfo32
 117{
 118        char    pr_state;       /* numeric process state */
 119        char    pr_sname;       /* char for pr_state */
 120        char    pr_zomb;        /* zombie */
 121        char    pr_nice;        /* nice val */
 122        unsigned int pr_flag;   /* flags */
 123        __kernel_uid_t  pr_uid;
 124        __kernel_gid_t  pr_gid;
 125        pid_t   pr_pid, pr_ppid, pr_pgrp, pr_sid;
 126        /* Lots missing */
 127        char    pr_fname[16];   /* filename of executable */
 128        char    pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
 129};
 130
 131#define elf_caddr_t     u32
 132#define init_elf_binfmt init_elf32_binfmt
 133
 134#define jiffies_to_timeval jiffies_to_compat_timeval
 135static inline void
 136jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
 137{
 138        /*
 139         * Convert jiffies to nanoseconds and separate with
 140         * one divide.
 141         */
 142        u64 nsec = (u64)jiffies * TICK_NSEC;
 143        u32 rem;
 144        value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
 145        value->tv_usec = rem / NSEC_PER_USEC;
 146}
 147
 148void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)
 149{
 150        int i;
 151
 152        for (i = 0; i < EF_R0; i++)
 153                grp[i] = 0;
 154        grp[EF_R0] = 0;
 155        for (i = 1; i <= 31; i++)
 156                grp[EF_R0 + i] = (elf_greg_t) regs->regs[i];
 157        grp[EF_R26] = 0;
 158        grp[EF_R27] = 0;
 159        grp[EF_LO] = (elf_greg_t) regs->lo;
 160        grp[EF_HI] = (elf_greg_t) regs->hi;
 161        grp[EF_CP0_EPC] = (elf_greg_t) regs->cp0_epc;
 162        grp[EF_CP0_BADVADDR] = (elf_greg_t) regs->cp0_badvaddr;
 163        grp[EF_CP0_STATUS] = (elf_greg_t) regs->cp0_status;
 164        grp[EF_CP0_CAUSE] = (elf_greg_t) regs->cp0_cause;
 165#ifdef EF_UNUSED0
 166        grp[EF_UNUSED0] = 0;
 167#endif
 168}
 169
 170MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
 171MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
 172
 173#undef MODULE_DESCRIPTION
 174#undef MODULE_AUTHOR
 175
 176#undef TASK_SIZE
 177#define TASK_SIZE TASK_SIZE32
 178
 179#undef cputime_to_timeval
 180#define cputime_to_timeval cputime_to_compat_timeval
 181static __inline__ void
 182cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
 183{
 184        unsigned long jiffies = cputime_to_jiffies(cputime);
 185
 186        value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
 187        value->tv_sec = jiffies / HZ;
 188}
 189
 190#include "../../../fs/binfmt_elf.c"
 191