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 24typedef unsigned int elf_greg_t; 25typedef elf_greg_t elf_gregset_t[ELF_NGREG]; 26 27typedef double elf_fpreg_t; 28typedef 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 (__h->e_machine != EM_MIPS) \ 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 81struct 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 100struct 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 119static inline void 120jiffies_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 132MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries"); 133MODULE_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 143static __inline__ void 144cputime_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