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 /* These MUST be defined before elf.h gets included */
  62 extern void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs);
  63 #define ELF_CORE_COPY_REGS(_dest, _regs) elf32_core_copy_regs(_dest, _regs);
  64 #define ELF_CORE_COPY_TASK_REGS(_tsk, _dest)                            \
  65 ({                                                                      \
  66         int __res = 1;                                                  \
  67         elf32_core_copy_regs(*(_dest), task_pt_regs(_tsk));             \
  68         __res;                                                          \
  69 })
  70
  71 #include <linux/module.h>
  72 #include <linux/elfcore.h>
  73 #include <linux/compat.h>
  74 #include <linux/math64.h>
  75
  76 #define elf_prstatus elf_prstatus32
  77 struct elf_prstatus32
  78 {
  79         struct elf_siginfo pr_info;     /* Info associated with signal */
  80         short   pr_cursig;              /* Current signal */
  81         unsigned int pr_sigpend;        /* Set of pending signals */
  82         unsigned int pr_sighold;        /* Set of held signals */
  83         pid_t   pr_pid;
  84         pid_t   pr_ppid;
  85         pid_t   pr_pgrp;
  86         pid_t   pr_sid;
  87         struct compat_timeval pr_utime; /* User time */
  88         struct compat_timeval pr_stime; /* System time */
  89         struct compat_timeval pr_cutime;/* Cumulative user time */
  90         struct compat_timeval pr_cstime;/* Cumulative system time */
  91         elf_gregset_t pr_reg;   /* GP registers */
  92         int pr_fpvalid;         /* True if math co-processor being used.  */
  93 };
  94
  95 #define elf_prpsinfo elf_prpsinfo32
  96 struct elf_prpsinfo32
  97 {
  98         char    pr_state;       /* numeric process state */
  99         char    pr_sname;       /* char for pr_state */
 100         char    pr_zomb;        /* zombie */
 101         char    pr_nice;        /* nice val */
 102         unsigned int pr_flag;   /* flags */
 103         __kernel_uid_t  pr_uid;
 104         __kernel_gid_t  pr_gid;
 105         pid_t   pr_pid, pr_ppid, pr_pgrp, pr_sid;
 106         /* Lots missing */
 107         char    pr_fname[16];   /* filename of executable */
 108         char    pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
 109 };
 110
 111 #define elf_caddr_t     u32
 112 #define init_elf_binfmt init_elf32_binfmt
 113
 114 #define jiffies_to_timeval jiffies_to_compat_timeval
 115 static inline void
 116 jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
 117 {
 118         /*
 119          * Convert jiffies to nanoseconds and separate with
 120          * one divide.
 121          */
 122         u64 nsec = (u64)jiffies * TICK_NSEC;
 123         u32 rem;
 124         value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
 125         value->tv_usec = rem / NSEC_PER_USEC;
 126 }
 127
 128 void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)
 129 {
 130         int i;
 131
 132         for (i = 0; i < MIPS32_EF_R0; i++)
 133                 grp[i] = 0;
 134         grp[MIPS32_EF_R0] = 0;
 135         for (i = 1; i <= 31; i++)
 136                 grp[MIPS32_EF_R0 + i] = (elf_greg_t) regs->regs[i];
 137         grp[MIPS32_EF_R26] = 0;
 138         grp[MIPS32_EF_R27] = 0;
 139         grp[MIPS32_EF_LO] = (elf_greg_t) regs->lo;
 140         grp[MIPS32_EF_HI] = (elf_greg_t) regs->hi;
 141         grp[MIPS32_EF_CP0_EPC] = (elf_greg_t) regs->cp0_epc;
 142         grp[MIPS32_EF_CP0_BADVADDR] = (elf_greg_t) regs->cp0_badvaddr;
 143         grp[MIPS32_EF_CP0_STATUS] = (elf_greg_t) regs->cp0_status;
 144         grp[MIPS32_EF_CP0_CAUSE] = (elf_greg_t) regs->cp0_cause;
 145 #ifdef MIPS32_EF_UNUSED0
 146         grp[MIPS32_EF_UNUSED0] = 0;
 147 #endif
 148 }
 149
 150 MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
 151 MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
 152
 153 #undef MODULE_DESCRIPTION
 154 #undef MODULE_AUTHOR
 155
 156 #undef TASK_SIZE
 157 #define TASK_SIZE TASK_SIZE32
 158
 159 #undef cputime_to_timeval
 160 #define cputime_to_timeval cputime_to_compat_timeval
 161 static __inline__ void
 162 cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
 163 {
 164         unsigned long jiffies = cputime_to_jiffies(cputime);
 165
 166         value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
 167         value->tv_sec = jiffies / HZ;
 168 }
 169
 170 #include "../../../fs/binfmt_elf.c"