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 /* These MUST be defined before elf.h gets included */
  76 extern void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs);
  77 #define ELF_CORE_COPY_REGS(_dest, _regs) elf32_core_copy_regs(_dest, _regs);
  78 #define ELF_CORE_COPY_TASK_REGS(_tsk, _dest)                            \
  79 ({                                                                      \
  80         int __res = 1;                                                  \
  81         elf32_core_copy_regs(*(_dest), task_pt_regs(_tsk));             \
  82         __res;                                                          \
  83 })
  84
  85 #include <linux/module.h>
  86 #include <linux/elfcore.h>
  87 #include <linux/compat.h>
  88 #include <linux/math64.h>
  89
  90 #define elf_prstatus elf_prstatus32
  91 struct elf_prstatus32
  92 {
  93         struct elf_siginfo pr_info;     /* Info associated with signal */
  94         short   pr_cursig;              /* Current signal */
  95         unsigned int pr_sigpend;        /* Set of pending signals */
  96         unsigned int pr_sighold;        /* Set of held signals */
  97         pid_t   pr_pid;
  98         pid_t   pr_ppid;
  99         pid_t   pr_pgrp;
 100         pid_t   pr_sid;
 101         struct compat_timeval pr_utime; /* User time */
 102         struct compat_timeval pr_stime; /* System time */
 103         struct compat_timeval pr_cutime;/* Cumulative user time */
 104         struct compat_timeval pr_cstime;/* Cumulative system time */
 105         elf_gregset_t pr_reg;   /* GP registers */
 106         int pr_fpvalid;         /* True if math co-processor being used.  */
 107 };
 108
 109 #define elf_prpsinfo elf_prpsinfo32
 110 struct elf_prpsinfo32
 111 {
 112         char    pr_state;       /* numeric process state */
 113         char    pr_sname;       /* char for pr_state */
 114         char    pr_zomb;        /* zombie */
 115         char    pr_nice;        /* nice val */
 116         unsigned int pr_flag;   /* flags */
 117         __kernel_uid_t  pr_uid;
 118         __kernel_gid_t  pr_gid;
 119         pid_t   pr_pid, pr_ppid, pr_pgrp, pr_sid;
 120         /* Lots missing */
 121         char    pr_fname[16];   /* filename of executable */
 122         char    pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
 123 };
 124
 125 #define elf_caddr_t     u32
 126 #define init_elf_binfmt init_elf32_binfmt
 127
 128 #define jiffies_to_timeval jiffies_to_compat_timeval
 129 static inline void
 130 jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
 131 {
 132         /*
 133          * Convert jiffies to nanoseconds and separate with
 134          * one divide.
 135          */
 136         u64 nsec = (u64)jiffies * TICK_NSEC;
 137         u32 rem;
 138         value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
 139         value->tv_usec = rem / NSEC_PER_USEC;
 140 }
 141
 142 void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)
 143 {
 144         int i;
 145
 146         for (i = 0; i < MIPS32_EF_R0; i++)
 147                 grp[i] = 0;
 148         grp[MIPS32_EF_R0] = 0;
 149         for (i = 1; i <= 31; i++)
 150                 grp[MIPS32_EF_R0 + i] = (elf_greg_t) regs->regs[i];
 151         grp[MIPS32_EF_R26] = 0;
 152         grp[MIPS32_EF_R27] = 0;
 153         grp[MIPS32_EF_LO] = (elf_greg_t) regs->lo;
 154         grp[MIPS32_EF_HI] = (elf_greg_t) regs->hi;
 155         grp[MIPS32_EF_CP0_EPC] = (elf_greg_t) regs->cp0_epc;
 156         grp[MIPS32_EF_CP0_BADVADDR] = (elf_greg_t) regs->cp0_badvaddr;
 157         grp[MIPS32_EF_CP0_STATUS] = (elf_greg_t) regs->cp0_status;
 158         grp[MIPS32_EF_CP0_CAUSE] = (elf_greg_t) regs->cp0_cause;
 159 #ifdef MIPS32_EF_UNUSED0
 160         grp[MIPS32_EF_UNUSED0] = 0;
 161 #endif
 162 }
 163
 164 MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
 165 MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
 166
 167 #undef MODULE_DESCRIPTION
 168 #undef MODULE_AUTHOR
 169
 170 #undef TASK_SIZE
 171 #define TASK_SIZE TASK_SIZE32
 172
 173 #undef cputime_to_timeval
 174 #define cputime_to_timeval cputime_to_compat_timeval
 175 static __inline__ void
 176 cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
 177 {
 178         unsigned long jiffies = cputime_to_jiffies(cputime);
 179
 180         value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
 181         value->tv_sec = jiffies / HZ;
 182 }
 183
 184 #include "../../../fs/binfmt_elf.c"