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