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Linux/arch/mips/kernel/binfmt_elfn32.c

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  1 /*
  2  * Support for n32 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 long 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             ((__h->e_flags & EF_MIPS_ABI) != 0))                        \
 44                 __res = 0;                                              \
 45                                                                         \
 46         __res;                                                          \
 47 })
 48 
 49 #define TASK32_SIZE             0x7fff8000UL
 50 #undef ELF_ET_DYN_BASE
 51 #define ELF_ET_DYN_BASE         (TASK32_SIZE / 3 * 2)
 52 
 53 #include <asm/processor.h>
 54 #include <linux/module.h>
 55 #include <linux/elfcore.h>
 56 #include <linux/compat.h>
 57 #include <linux/math64.h>
 58 
 59 #define elf_prstatus elf_prstatus32
 60 struct elf_prstatus32
 61 {
 62         struct elf_siginfo pr_info;     /* Info associated with signal */
 63         short   pr_cursig;              /* Current signal */
 64         unsigned int pr_sigpend;        /* Set of pending signals */
 65         unsigned int pr_sighold;        /* Set of held signals */
 66         pid_t   pr_pid;
 67         pid_t   pr_ppid;
 68         pid_t   pr_pgrp;
 69         pid_t   pr_sid;
 70         struct compat_timeval pr_utime; /* User time */
 71         struct compat_timeval pr_stime; /* System time */
 72         struct compat_timeval pr_cutime;/* Cumulative user time */
 73         struct compat_timeval pr_cstime;/* Cumulative system time */
 74         elf_gregset_t pr_reg;   /* GP registers */
 75         int pr_fpvalid;         /* True if math co-processor being used.  */
 76 };
 77 
 78 #define elf_prpsinfo elf_prpsinfo32
 79 struct elf_prpsinfo32
 80 {
 81         char    pr_state;       /* numeric process state */
 82         char    pr_sname;       /* char for pr_state */
 83         char    pr_zomb;        /* zombie */
 84         char    pr_nice;        /* nice val */
 85         unsigned int pr_flag;   /* flags */
 86         __kernel_uid_t  pr_uid;
 87         __kernel_gid_t  pr_gid;
 88         pid_t   pr_pid, pr_ppid, pr_pgrp, pr_sid;
 89         /* Lots missing */
 90         char    pr_fname[16];   /* filename of executable */
 91         char    pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
 92 };
 93 
 94 #define elf_caddr_t     u32
 95 #define init_elf_binfmt init_elfn32_binfmt
 96 
 97 #define jiffies_to_timeval jiffies_to_compat_timeval
 98 static __inline__ void
 99 jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
100 {
101         /*
102          * Convert jiffies to nanoseconds and separate with
103          * one divide.
104          */
105         u64 nsec = (u64)jiffies * TICK_NSEC;
106         u32 rem;
107         value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
108         value->tv_usec = rem / NSEC_PER_USEC;
109 }
110 
111 #define ELF_CORE_EFLAGS EF_MIPS_ABI2
112 
113 MODULE_DESCRIPTION("Binary format loader for compatibility with n32 Linux/MIPS binaries");
114 MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
115 
116 #undef MODULE_DESCRIPTION
117 #undef MODULE_AUTHOR
118 
119 #undef TASK_SIZE
120 #define TASK_SIZE TASK_SIZE32
121 
122 #undef cputime_to_timeval
123 #define cputime_to_timeval cputime_to_compat_timeval
124 static __inline__ void
125 cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
126 {
127         unsigned long jiffies = cputime_to_jiffies(cputime);
128 
129         value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
130         value->tv_sec = jiffies / HZ;
131 }
132 
133 #include "../../../fs/binfmt_elf.c"
134 

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