arch/mips/kernel/binfmt_elfo32.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Support for o32 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 int 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 elfo32_check_arch
  36
  37 #ifdef CONFIG_KVM_GUEST
  38 #define TASK32_SIZE             0x3fff8000UL
  39 #else
  40 #define TASK32_SIZE             0x7fff8000UL
  41 #endif
  42 #undef ELF_ET_DYN_BASE
  43 #define ELF_ET_DYN_BASE         (TASK32_SIZE / 3 * 2)
  44
  45 #include <asm/processor.h>
  46
  47 #include <linux/elfcore.h>
  48 #include <linux/compat.h>
  49 #include <linux/math64.h>
  50
  51 #define elf_prstatus elf_prstatus32
  52 struct elf_prstatus32
  53 {
  54         struct elf_siginfo pr_info;     /* Info associated with signal */
  55         short   pr_cursig;              /* Current signal */
  56         unsigned int pr_sigpend;        /* Set of pending signals */
  57         unsigned int pr_sighold;        /* Set of held signals */
  58         pid_t   pr_pid;
  59         pid_t   pr_ppid;
  60         pid_t   pr_pgrp;
  61         pid_t   pr_sid;
  62         struct old_timeval32 pr_utime; /* User time */
  63         struct old_timeval32 pr_stime; /* System time */
  64         struct old_timeval32 pr_cutime;/* Cumulative user time */
  65         struct old_timeval32 pr_cstime;/* Cumulative system time */
  66         elf_gregset_t pr_reg;   /* GP registers */
  67         int pr_fpvalid;         /* True if math co-processor being used.  */
  68 };
  69
  70 #define elf_prpsinfo elf_prpsinfo32
  71 struct elf_prpsinfo32
  72 {
  73         char    pr_state;       /* numeric process state */
  74         char    pr_sname;       /* char for pr_state */
  75         char    pr_zomb;        /* zombie */
  76         char    pr_nice;        /* nice val */
  77         unsigned int pr_flag;   /* flags */
  78         __kernel_uid_t  pr_uid;
  79         __kernel_gid_t  pr_gid;
  80         pid_t   pr_pid, pr_ppid, pr_pgrp, pr_sid;
  81         /* Lots missing */
  82         char    pr_fname[16];   /* filename of executable */
  83         char    pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
  84 };
  85
  86 #define elf_caddr_t     u32
  87 #define init_elf_binfmt init_elf32_binfmt
  88
  89 #define jiffies_to_timeval jiffies_to_old_timeval32
  90 static inline void
  91 jiffies_to_old_timeval32(unsigned long jiffies, struct old_timeval32 *value)
  92 {
  93         /*
  94          * Convert jiffies to nanoseconds and separate with
  95          * one divide.
  96          */
  97         u64 nsec = (u64)jiffies * TICK_NSEC;
  98         u32 rem;
  99         value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
 100         value->tv_usec = rem / NSEC_PER_USEC;
 101 }
 102
 103 #undef TASK_SIZE
 104 #define TASK_SIZE TASK_SIZE32
 105
 106 #undef ns_to_kernel_old_timeval
 107 #define ns_to_kernel_old_timeval ns_to_old_timeval32
 108
 109 #include "../../../fs/binfmt_elf.c"