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#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#include <linux/math64.h>
  60
  61#define elf_prstatus elf_prstatus32
  62struct elf_prstatus32
  63{
  64        struct elf_siginfo pr_info;     /* Info associated with signal */
  65        short   pr_cursig;              /* Current signal */
  66        unsigned int pr_sigpend;        /* Set of pending signals */
  67        unsigned int pr_sighold;        /* Set of held signals */
  68        pid_t   pr_pid;
  69        pid_t   pr_ppid;
  70        pid_t   pr_pgrp;
  71        pid_t   pr_sid;
  72        struct compat_timeval pr_utime; /* User time */
  73        struct compat_timeval pr_stime; /* System time */
  74        struct compat_timeval pr_cutime;/* Cumulative user time */
  75        struct compat_timeval pr_cstime;/* Cumulative system time */
  76        elf_gregset_t pr_reg;   /* GP registers */
  77        int pr_fpvalid;         /* True if math co-processor being used.  */
  78};
  79
  80#define elf_prpsinfo elf_prpsinfo32
  81struct elf_prpsinfo32
  82{
  83        char    pr_state;       /* numeric process state */
  84        char    pr_sname;       /* char for pr_state */
  85        char    pr_zomb;        /* zombie */
  86        char    pr_nice;        /* nice val */
  87        unsigned int pr_flag;   /* flags */
  88        __kernel_uid_t  pr_uid;
  89        __kernel_gid_t  pr_gid;
  90        pid_t   pr_pid, pr_ppid, pr_pgrp, pr_sid;
  91        /* Lots missing */
  92        char    pr_fname[16];   /* filename of executable */
  93        char    pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
  94};
  95
  96#define elf_caddr_t     u32
  97#define init_elf_binfmt init_elf32_binfmt
  98
  99#define jiffies_to_timeval jiffies_to_compat_timeval
 100static inline void
 101jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
 102{
 103        /*
 104         * Convert jiffies to nanoseconds and separate with
 105         * one divide.
 106         */
 107        u64 nsec = (u64)jiffies * TICK_NSEC;
 108        u32 rem;
 109        value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
 110        value->tv_usec = rem / NSEC_PER_USEC;
 111}
 112
 113#undef ELF_CORE_COPY_REGS
 114#define ELF_CORE_COPY_REGS(_dest, _regs) elf32_core_copy_regs(_dest, _regs);
 115
 116void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)
 117{
 118        int i;
 119
 120        for (i = 0; i < EF_R0; i++)
 121                grp[i] = 0;
 122        grp[EF_R0] = 0;
 123        for (i = 1; i <= 31; i++)
 124                grp[EF_R0 + i] = (elf_greg_t) regs->regs[i];
 125        grp[EF_R26] = 0;
 126        grp[EF_R27] = 0;
 127        grp[EF_LO] = (elf_greg_t) regs->lo;
 128        grp[EF_HI] = (elf_greg_t) regs->hi;
 129        grp[EF_CP0_EPC] = (elf_greg_t) regs->cp0_epc;
 130        grp[EF_CP0_BADVADDR] = (elf_greg_t) regs->cp0_badvaddr;
 131        grp[EF_CP0_STATUS] = (elf_greg_t) regs->cp0_status;
 132        grp[EF_CP0_CAUSE] = (elf_greg_t) regs->cp0_cause;
 133#ifdef EF_UNUSED0
 134        grp[EF_UNUSED0] = 0;
 135#endif
 136}
 137
 138MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
 139MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
 140
 141#undef MODULE_DESCRIPTION
 142#undef MODULE_AUTHOR
 143
 144#undef TASK_SIZE
 145#define TASK_SIZE TASK_SIZE32
 146
 147#include "../../../fs/binfmt_elf.c"
 148