arch/mips/kernel/binfmt_elfn32.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Support for n32 Linux/MIPS ELF binaries.
   4  * Author: Ralf Baechle (ralf@linux-mips.org)
   5  *
   6  * Copyright (C) 1999, 2001 Ralf Baechle
   7  * Copyright (C) 1999, 2001 Silicon Graphics, Inc.
   8  *
   9  * Heavily inspired by the 32-bit Sparc compat code which is
  10  * Copyright (C) 1995, 1996, 1997, 1998 David S. Miller (davem@redhat.com)
  11  * Copyright (C) 1995, 1996, 1997, 1998 Jakub Jelinek   (jj@ultra.linux.cz)
  12  */
  13
  14 #define ELF_ARCH                EM_MIPS
  15 #define ELF_CLASS               ELFCLASS32
  16 #ifdef __MIPSEB__
  17 #define ELF_DATA                ELFDATA2MSB;
  18 #else /* __MIPSEL__ */
  19 #define ELF_DATA                ELFDATA2LSB;
  20 #endif
  21
  22 /* ELF register definitions */
  23 #define ELF_NGREG       45
  24 #define ELF_NFPREG      33
  25
  26 typedef unsigned long elf_greg_t;
  27 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  28
  29 typedef double elf_fpreg_t;
  30 typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
  31
  32 /*
  33  * This is used to ensure we don't load something for the wrong architecture.
  34  */
  35 #define elf_check_arch elfn32_check_arch
  36
  37 #define TASK32_SIZE             0x7fff8000UL
  38 #undef ELF_ET_DYN_BASE
  39 #define ELF_ET_DYN_BASE         (TASK32_SIZE / 3 * 2)
  40
  41 #include <asm/processor.h>
  42 #include <linux/elfcore.h>
  43 #include <linux/compat.h>
  44 #include <linux/math64.h>
  45
  46 #define elf_prstatus elf_prstatus32
  47 struct elf_prstatus32
  48 {
  49         struct elf_siginfo pr_info;     /* Info associated with signal */
  50         short   pr_cursig;              /* Current signal */
  51         unsigned int pr_sigpend;        /* Set of pending signals */
  52         unsigned int pr_sighold;        /* Set of held signals */
  53         pid_t   pr_pid;
  54         pid_t   pr_ppid;
  55         pid_t   pr_pgrp;
  56         pid_t   pr_sid;
  57         struct old_timeval32 pr_utime; /* User time */
  58         struct old_timeval32 pr_stime; /* System time */
  59         struct old_timeval32 pr_cutime;/* Cumulative user time */
  60         struct old_timeval32 pr_cstime;/* Cumulative system time */
  61         elf_gregset_t pr_reg;   /* GP registers */
  62         int pr_fpvalid;         /* True if math co-processor being used.  */
  63 };
  64
  65 #define elf_prpsinfo elf_prpsinfo32
  66 struct elf_prpsinfo32
  67 {
  68         char    pr_state;       /* numeric process state */
  69         char    pr_sname;       /* char for pr_state */
  70         char    pr_zomb;        /* zombie */
  71         char    pr_nice;        /* nice val */
  72         unsigned int pr_flag;   /* flags */
  73         __kernel_uid_t  pr_uid;
  74         __kernel_gid_t  pr_gid;
  75         pid_t   pr_pid, pr_ppid, pr_pgrp, pr_sid;
  76         /* Lots missing */
  77         char    pr_fname[16];   /* filename of executable */
  78         char    pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
  79 };
  80
  81 #define elf_caddr_t     u32
  82 #define init_elf_binfmt init_elfn32_binfmt
  83
  84 #define jiffies_to_timeval jiffies_to_old_timeval32
  85 static __inline__ void
  86 jiffies_to_old_timeval32(unsigned long jiffies, struct old_timeval32 *value)
  87 {
  88         /*
  89          * Convert jiffies to nanoseconds and separate with
  90          * one divide.
  91          */
  92         u64 nsec = (u64)jiffies * TICK_NSEC;
  93         u32 rem;
  94         value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
  95         value->tv_usec = rem / NSEC_PER_USEC;
  96 }
  97
  98 #define ELF_CORE_EFLAGS EF_MIPS_ABI2
  99
 100 #undef TASK_SIZE
 101 #define TASK_SIZE TASK_SIZE32
 102
 103 #undef ns_to_timeval
 104 #define ns_to_timeval ns_to_old_timeval32
 105
 106 #include "../../../fs/binfmt_elf.c"