LXR linux/arch/mips/kernel/binfmt

   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
  24typedef unsigned int elf_greg_t;
  25typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  26
  27typedef double elf_fpreg_t;
  28typedef 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 */
  68extern 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
  83struct 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
 102struct 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
 121static inline void
 122jiffies_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
 134void 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
 156MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
 157MODULE_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#undef cputime_to_timeval
 166#define cputime_to_timeval cputime_to_compat_timeval
 167static __inline__ void
 168cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
 169{
 170        unsigned long jiffies = cputime_to_jiffies(cputime);
 171
 172        value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
 173        value->tv_sec = jiffies / HZ;
 174}
 175
 176#include "../../../fs/binfmt_elf.c"
 177