arch/mips/kernel/binfmt_elfo32.c

   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
  24 typedef unsigned int 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 elfo32_check_arch
  34
  35 #ifdef CONFIG_KVM_GUEST
  36 #define TASK32_SIZE             0x3fff8000UL
  37 #else
  38 #define TASK32_SIZE             0x7fff8000UL
  39 #endif
  40 #undef ELF_ET_DYN_BASE
  41 #define ELF_ET_DYN_BASE         (TASK32_SIZE / 3 * 2)
  42
  43 #include <asm/processor.h>
  44
  45 #include <linux/module.h>
  46 #include <linux/elfcore.h>
  47 #include <linux/compat.h>
  48 #include <linux/math64.h>
  49
  50 #define elf_prstatus elf_prstatus32
  51 struct elf_prstatus32
  52 {
  53         struct elf_siginfo pr_info;     /* Info associated with signal */
  54         short   pr_cursig;              /* Current signal */
  55         unsigned int pr_sigpend;        /* Set of pending signals */
  56         unsigned int pr_sighold;        /* Set of held signals */
  57         pid_t   pr_pid;
  58         pid_t   pr_ppid;
  59         pid_t   pr_pgrp;
  60         pid_t   pr_sid;
  61         struct compat_timeval pr_utime; /* User time */
  62         struct compat_timeval pr_stime; /* System time */
  63         struct compat_timeval pr_cutime;/* Cumulative user time */
  64         struct compat_timeval pr_cstime;/* Cumulative system time */
  65         elf_gregset_t pr_reg;   /* GP registers */
  66         int pr_fpvalid;         /* True if math co-processor being used.  */
  67 };
  68
  69 #define elf_prpsinfo elf_prpsinfo32
  70 struct elf_prpsinfo32
  71 {
  72         char    pr_state;       /* numeric process state */
  73         char    pr_sname;       /* char for pr_state */
  74         char    pr_zomb;        /* zombie */
  75         char    pr_nice;        /* nice val */
  76         unsigned int pr_flag;   /* flags */
  77         __kernel_uid_t  pr_uid;
  78         __kernel_gid_t  pr_gid;
  79         pid_t   pr_pid, pr_ppid, pr_pgrp, pr_sid;
  80         /* Lots missing */
  81         char    pr_fname[16];   /* filename of executable */
  82         char    pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
  83 };
  84
  85 #define elf_caddr_t     u32
  86 #define init_elf_binfmt init_elf32_binfmt
  87
  88 #define jiffies_to_timeval jiffies_to_compat_timeval
  89 static inline void
  90 jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
  91 {
  92         /*
  93          * Convert jiffies to nanoseconds and separate with
  94          * one divide.
  95          */
  96         u64 nsec = (u64)jiffies * TICK_NSEC;
  97         u32 rem;
  98         value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
  99         value->tv_usec = rem / NSEC_PER_USEC;
 100 }
 101
 102 MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
 103 MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
 104
 105 #undef MODULE_DESCRIPTION
 106 #undef MODULE_AUTHOR
 107
 108 #undef TASK_SIZE
 109 #define TASK_SIZE TASK_SIZE32
 110
 111 #undef cputime_to_timeval
 112 #define cputime_to_timeval cputime_to_compat_timeval
 113 static __inline__ void
 114 cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
 115 {
 116         unsigned long jiffies = cputime_to_jiffies(cputime);
 117
 118         value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
 119         value->tv_sec = jiffies / HZ;
 120 }
 121
 122 #include "../../../fs/binfmt_elf.c"