arch/mips/kernel/binfmt_elfn32.c

   1 /*
   2  * Support for n32 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
  24 typedef unsigned long elf_greg_t;
  25 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  26
  27 typedef double elf_fpreg_t;
  28 typedef 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             ((__h->e_flags & EF_MIPS_ABI) != 0))                        \
  44                 __res = 0;                                              \
  45                                                                         \
  46         __res;                                                          \
  47 })
  48
  49 #define TASK32_SIZE             0x7fff8000UL
  50 #undef ELF_ET_DYN_BASE
  51 #define ELF_ET_DYN_BASE         (TASK32_SIZE / 3 * 2)
  52
  53 #include <asm/processor.h>
  54 #include <linux/module.h>
  55 #include <linux/elfcore.h>
  56 #include <linux/compat.h>
  57 #include <linux/math64.h>
  58
  59 #define elf_prstatus elf_prstatus32
  60 struct elf_prstatus32
  61 {
  62         struct elf_siginfo pr_info;     /* Info associated with signal */
  63         short   pr_cursig;              /* Current signal */
  64         unsigned int pr_sigpend;        /* Set of pending signals */
  65         unsigned int pr_sighold;        /* Set of held signals */
  66         pid_t   pr_pid;
  67         pid_t   pr_ppid;
  68         pid_t   pr_pgrp;
  69         pid_t   pr_sid;
  70         struct compat_timeval pr_utime; /* User time */
  71         struct compat_timeval pr_stime; /* System time */
  72         struct compat_timeval pr_cutime;/* Cumulative user time */
  73         struct compat_timeval pr_cstime;/* Cumulative system time */
  74         elf_gregset_t pr_reg;   /* GP registers */
  75         int pr_fpvalid;         /* True if math co-processor being used.  */
  76 };
  77
  78 #define elf_prpsinfo elf_prpsinfo32
  79 struct elf_prpsinfo32
  80 {
  81         char    pr_state;       /* numeric process state */
  82         char    pr_sname;       /* char for pr_state */
  83         char    pr_zomb;        /* zombie */
  84         char    pr_nice;        /* nice val */
  85         unsigned int pr_flag;   /* flags */
  86         __kernel_uid_t  pr_uid;
  87         __kernel_gid_t  pr_gid;
  88         pid_t   pr_pid, pr_ppid, pr_pgrp, pr_sid;
  89         /* Lots missing */
  90         char    pr_fname[16];   /* filename of executable */
  91         char    pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
  92 };
  93
  94 #define elf_caddr_t     u32
  95 #define init_elf_binfmt init_elfn32_binfmt
  96
  97 #define jiffies_to_timeval jiffies_to_compat_timeval
  98 static __inline__ void
  99 jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
 100 {
 101         /*
 102          * Convert jiffies to nanoseconds and separate with
 103          * one divide.
 104          */
 105         u64 nsec = (u64)jiffies * TICK_NSEC;
 106         u32 rem;
 107         value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
 108         value->tv_usec = rem / NSEC_PER_USEC;
 109 }
 110
 111 #define ELF_CORE_EFLAGS EF_MIPS_ABI2
 112
 113 MODULE_DESCRIPTION("Binary format loader for compatibility with n32 Linux/MIPS binaries");
 114 MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
 115
 116 #undef MODULE_DESCRIPTION
 117 #undef MODULE_AUTHOR
 118
 119 #undef TASK_SIZE
 120 #define TASK_SIZE TASK_SIZE32
 121
 122 #undef cputime_to_timeval
 123 #define cputime_to_timeval cputime_to_compat_timeval
 124 static __inline__ void
 125 cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
 126 {
 127         unsigned long jiffies = cputime_to_jiffies(cputime);
 128
 129         value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
 130         value->tv_sec = jiffies / HZ;
 131 }
 132
 133 #include "../../../fs/binfmt_elf.c"