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(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 #ifdef CONFIG_KVM_GUEST
  52 #define TASK32_SIZE             0x3fff8000UL
  53 #else
  54 #define TASK32_SIZE             0x7fff8000UL
  55 #endif
  56 #undef ELF_ET_DYN_BASE
  57 #define ELF_ET_DYN_BASE         (TASK32_SIZE / 3 * 2)
  58
  59 #include <asm/processor.h>
  60
  61 /*
  62  * When this file is selected, we are definitely running a 64bit kernel.
  63  * So using the right regs define in asm/reg.h
  64  */
  65 #define WANT_COMPAT_REG_H
  66
  67 /* These MUST be defined before elf.h gets included */
  68 extern void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs);
  69 #define ELF_CORE_COPY_REGS(_dest, _regs) elf32_core_copy_regs(_dest, _regs);
  70 #define ELF_CORE_COPY_TASK_REGS(_tsk, _dest)                            \
  71 ({                                                                      \
  72         int __res = 1;                                                  \
  73         elf32_core_copy_regs(*(_dest), task_pt_regs(_tsk));             \
  74         __res;                                                          \
  75 })
  76
  77 #include <linux/module.h>
  78 #include <linux/elfcore.h>
  79 #include <linux/compat.h>
  80 #include <linux/math64.h>
  81
  82 #define elf_prstatus elf_prstatus32
  83 struct elf_prstatus32
  84 {
  85         struct elf_siginfo pr_info;     /* Info associated with signal */
  86         short   pr_cursig;              /* Current signal */
  87         unsigned int pr_sigpend;        /* Set of pending signals */
  88         unsigned int pr_sighold;        /* Set of held signals */
  89         pid_t   pr_pid;
  90         pid_t   pr_ppid;
  91         pid_t   pr_pgrp;
  92         pid_t   pr_sid;
  93         struct compat_timeval pr_utime; /* User time */
  94         struct compat_timeval pr_stime; /* System time */
  95         struct compat_timeval pr_cutime;/* Cumulative user time */
  96         struct compat_timeval pr_cstime;/* Cumulative system time */
  97         elf_gregset_t pr_reg;   /* GP registers */
  98         int pr_fpvalid;         /* True if math co-processor being used.  */
  99 };
 100
 101 #define elf_prpsinfo elf_prpsinfo32
 102 struct elf_prpsinfo32
 103 {
 104         char    pr_state;       /* numeric process state */
 105         char    pr_sname;       /* char for pr_state */
 106         char    pr_zomb;        /* zombie */
 107         char    pr_nice;        /* nice val */
 108         unsigned int pr_flag;   /* flags */
 109         __kernel_uid_t  pr_uid;
 110         __kernel_gid_t  pr_gid;
 111         pid_t   pr_pid, pr_ppid, pr_pgrp, pr_sid;
 112         /* Lots missing */
 113         char    pr_fname[16];   /* filename of executable */
 114         char    pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
 115 };
 116
 117 #define elf_caddr_t     u32
 118 #define init_elf_binfmt init_elf32_binfmt
 119
 120 #define jiffies_to_timeval jiffies_to_compat_timeval
 121 static inline void
 122 jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
 123 {
 124         /*
 125          * Convert jiffies to nanoseconds and separate with
 126          * one divide.
 127          */
 128         u64 nsec = (u64)jiffies * TICK_NSEC;
 129         u32 rem;
 130         value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
 131         value->tv_usec = rem / NSEC_PER_USEC;
 132 }
 133
 134 void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)
 135 {
 136         int i;
 137
 138         for (i = 0; i < EF_R0; i++)
 139                 grp[i] = 0;
 140         grp[EF_R0] = 0;
 141         for (i = 1; i <= 31; i++)
 142                 grp[EF_R0 + i] = (elf_greg_t) regs->regs[i];
 143         grp[EF_R26] = 0;
 144         grp[EF_R27] = 0;
 145         grp[EF_LO] = (elf_greg_t) regs->lo;
 146         grp[EF_HI] = (elf_greg_t) regs->hi;
 147         grp[EF_CP0_EPC] = (elf_greg_t) regs->cp0_epc;
 148         grp[EF_CP0_BADVADDR] = (elf_greg_t) regs->cp0_badvaddr;
 149         grp[EF_CP0_STATUS] = (elf_greg_t) regs->cp0_status;
 150         grp[EF_CP0_CAUSE] = (elf_greg_t) regs->cp0_cause;
 151 #ifdef EF_UNUSED0
 152         grp[EF_UNUSED0] = 0;
 153 #endif
 154 }
 155
 156 MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
 157 MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
 158
 159 #undef MODULE_DESCRIPTION
 160 #undef MODULE_AUTHOR
 161
 162 #undef TASK_SIZE
 163 #define TASK_SIZE TASK_SIZE32
 164
 165 #include "../../../fs/binfmt_elf.c"