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Linux/arch/mips/kernel/binfmt_elfo32.c

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  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  * In order to be sure that we don't attempt to execute an O32 binary which
 32  * requires 64 bit FP (FR=1) on a system which does not support it we refuse
 33  * to execute any binary which has bits specified by the following macro set
 34  * in its ELF header flags.
 35  */
 36 #ifdef CONFIG_MIPS_O32_FP64_SUPPORT
 37 # define __MIPS_O32_FP64_MUST_BE_ZERO   0
 38 #else
 39 # define __MIPS_O32_FP64_MUST_BE_ZERO   EF_MIPS_FP64
 40 #endif
 41 
 42 /*
 43  * This is used to ensure we don't load something for the wrong architecture.
 44  */
 45 #define elf_check_arch(hdr)                                             \
 46 ({                                                                      \
 47         int __res = 1;                                                  \
 48         struct elfhdr *__h = (hdr);                                     \
 49                                                                         \
 50         if (!mips_elf_check_machine(__h))                               \
 51                 __res = 0;                                              \
 52         if (__h->e_ident[EI_CLASS] != ELFCLASS32)                       \
 53                 __res = 0;                                              \
 54         if ((__h->e_flags & EF_MIPS_ABI2) != 0)                         \
 55                 __res = 0;                                              \
 56         if (((__h->e_flags & EF_MIPS_ABI) != 0) &&                      \
 57             ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32))          \
 58                 __res = 0;                                              \
 59         if (__h->e_flags & __MIPS_O32_FP64_MUST_BE_ZERO)                \
 60                 __res = 0;                                              \
 61                                                                         \
 62         __res;                                                          \
 63 })
 64 
 65 #ifdef CONFIG_KVM_GUEST
 66 #define TASK32_SIZE             0x3fff8000UL
 67 #else
 68 #define TASK32_SIZE             0x7fff8000UL
 69 #endif
 70 #undef ELF_ET_DYN_BASE
 71 #define ELF_ET_DYN_BASE         (TASK32_SIZE / 3 * 2)
 72 
 73 #include <asm/processor.h>
 74 
 75 #include <linux/module.h>
 76 #include <linux/elfcore.h>
 77 #include <linux/compat.h>
 78 #include <linux/math64.h>
 79 
 80 #define elf_prstatus elf_prstatus32
 81 struct elf_prstatus32
 82 {
 83         struct elf_siginfo pr_info;     /* Info associated with signal */
 84         short   pr_cursig;              /* Current signal */
 85         unsigned int pr_sigpend;        /* Set of pending signals */
 86         unsigned int pr_sighold;        /* Set of held signals */
 87         pid_t   pr_pid;
 88         pid_t   pr_ppid;
 89         pid_t   pr_pgrp;
 90         pid_t   pr_sid;
 91         struct compat_timeval pr_utime; /* User time */
 92         struct compat_timeval pr_stime; /* System time */
 93         struct compat_timeval pr_cutime;/* Cumulative user time */
 94         struct compat_timeval pr_cstime;/* Cumulative system time */
 95         elf_gregset_t pr_reg;   /* GP registers */
 96         int pr_fpvalid;         /* True if math co-processor being used.  */
 97 };
 98 
 99 #define elf_prpsinfo elf_prpsinfo32
100 struct elf_prpsinfo32
101 {
102         char    pr_state;       /* numeric process state */
103         char    pr_sname;       /* char for pr_state */
104         char    pr_zomb;        /* zombie */
105         char    pr_nice;        /* nice val */
106         unsigned int pr_flag;   /* flags */
107         __kernel_uid_t  pr_uid;
108         __kernel_gid_t  pr_gid;
109         pid_t   pr_pid, pr_ppid, pr_pgrp, pr_sid;
110         /* Lots missing */
111         char    pr_fname[16];   /* filename of executable */
112         char    pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
113 };
114 
115 #define elf_caddr_t     u32
116 #define init_elf_binfmt init_elf32_binfmt
117 
118 #define jiffies_to_timeval jiffies_to_compat_timeval
119 static inline void
120 jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
121 {
122         /*
123          * Convert jiffies to nanoseconds and separate with
124          * one divide.
125          */
126         u64 nsec = (u64)jiffies * TICK_NSEC;
127         u32 rem;
128         value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
129         value->tv_usec = rem / NSEC_PER_USEC;
130 }
131 
132 MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
133 MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
134 
135 #undef MODULE_DESCRIPTION
136 #undef MODULE_AUTHOR
137 
138 #undef TASK_SIZE
139 #define TASK_SIZE TASK_SIZE32
140 
141 #undef cputime_to_timeval
142 #define cputime_to_timeval cputime_to_compat_timeval
143 static __inline__ void
144 cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
145 {
146         unsigned long jiffies = cputime_to_jiffies(cputime);
147 
148         value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
149         value->tv_sec = jiffies / HZ;
150 }
151 
152 #include "../../../fs/binfmt_elf.c"
153 

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