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  * 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 */
  82 extern 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
  97 struct 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
 116 struct 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
 135 static inline void
 136 jiffies_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
 148 void 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
 170 MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
 171 MODULE_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
 181 static __inline__ void
 182 cputime_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"