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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 elfn32_check_arch
 34 
 35 #define TASK32_SIZE             0x7fff8000UL
 36 #undef ELF_ET_DYN_BASE
 37 #define ELF_ET_DYN_BASE         (TASK32_SIZE / 3 * 2)
 38 
 39 #include <asm/processor.h>
 40 #include <linux/module.h>
 41 #include <linux/elfcore.h>
 42 #include <linux/compat.h>
 43 #include <linux/math64.h>
 44 
 45 #define elf_prstatus elf_prstatus32
 46 struct elf_prstatus32
 47 {
 48         struct elf_siginfo pr_info;     /* Info associated with signal */
 49         short   pr_cursig;              /* Current signal */
 50         unsigned int pr_sigpend;        /* Set of pending signals */
 51         unsigned int pr_sighold;        /* Set of held signals */
 52         pid_t   pr_pid;
 53         pid_t   pr_ppid;
 54         pid_t   pr_pgrp;
 55         pid_t   pr_sid;
 56         struct compat_timeval pr_utime; /* User time */
 57         struct compat_timeval pr_stime; /* System time */
 58         struct compat_timeval pr_cutime;/* Cumulative user time */
 59         struct compat_timeval pr_cstime;/* Cumulative system time */
 60         elf_gregset_t pr_reg;   /* GP registers */
 61         int pr_fpvalid;         /* True if math co-processor being used.  */
 62 };
 63 
 64 #define elf_prpsinfo elf_prpsinfo32
 65 struct elf_prpsinfo32
 66 {
 67         char    pr_state;       /* numeric process state */
 68         char    pr_sname;       /* char for pr_state */
 69         char    pr_zomb;        /* zombie */
 70         char    pr_nice;        /* nice val */
 71         unsigned int pr_flag;   /* flags */
 72         __kernel_uid_t  pr_uid;
 73         __kernel_gid_t  pr_gid;
 74         pid_t   pr_pid, pr_ppid, pr_pgrp, pr_sid;
 75         /* Lots missing */
 76         char    pr_fname[16];   /* filename of executable */
 77         char    pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
 78 };
 79 
 80 #define elf_caddr_t     u32
 81 #define init_elf_binfmt init_elfn32_binfmt
 82 
 83 #define jiffies_to_timeval jiffies_to_compat_timeval
 84 static __inline__ void
 85 jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
 86 {
 87         /*
 88          * Convert jiffies to nanoseconds and separate with
 89          * one divide.
 90          */
 91         u64 nsec = (u64)jiffies * TICK_NSEC;
 92         u32 rem;
 93         value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
 94         value->tv_usec = rem / NSEC_PER_USEC;
 95 }
 96 
 97 #define ELF_CORE_EFLAGS EF_MIPS_ABI2
 98 
 99 MODULE_DESCRIPTION("Binary format loader for compatibility with n32 Linux/MIPS binaries");
100 MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
101 
102 #undef MODULE_DESCRIPTION
103 #undef MODULE_AUTHOR
104 
105 #undef TASK_SIZE
106 #define TASK_SIZE TASK_SIZE32
107 
108 #undef cputime_to_timeval
109 #define cputime_to_timeval cputime_to_compat_timeval
110 static __inline__ void
111 cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
112 {
113         unsigned long jiffies = cputime_to_jiffies(cputime);
114 
115         value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
116         value->tv_sec = jiffies / HZ;
117 }
118 
119 #include "../../../fs/binfmt_elf.c"
120 

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