| 1 | /* |
| 2 | * sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on |
| 3 | * sys_sparc32 |
| 4 | * |
| 5 | * Copyright (C) 2000 VA Linux Co |
| 6 | * Copyright (C) 2000 Don Dugger <n0ano@valinux.com> |
| 7 | * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com> |
| 8 | * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
| 9 | * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) |
| 10 | * Copyright (C) 2000 Hewlett-Packard Co. |
| 11 | * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com> |
| 12 | * Copyright (C) 2000,2001,2002 Andi Kleen, SuSE Labs (x86-64 port) |
| 13 | * |
| 14 | * These routines maintain argument size conversion between 32bit and 64bit |
| 15 | * environment. In 2.5 most of this should be moved to a generic directory. |
| 16 | * |
| 17 | * This file assumes that there is a hole at the end of user address space. |
| 18 | * |
| 19 | * Some of the functions are LE specific currently. These are |
| 20 | * hopefully all marked. This should be fixed. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/sched.h> |
| 25 | #include <linux/fs.h> |
| 26 | #include <linux/file.h> |
| 27 | #include <linux/signal.h> |
| 28 | #include <linux/syscalls.h> |
| 29 | #include <linux/times.h> |
| 30 | #include <linux/utsname.h> |
| 31 | #include <linux/mm.h> |
| 32 | #include <linux/uio.h> |
| 33 | #include <linux/poll.h> |
| 34 | #include <linux/personality.h> |
| 35 | #include <linux/stat.h> |
| 36 | #include <linux/rwsem.h> |
| 37 | #include <linux/compat.h> |
| 38 | #include <linux/vfs.h> |
| 39 | #include <linux/ptrace.h> |
| 40 | #include <linux/highuid.h> |
| 41 | #include <linux/sysctl.h> |
| 42 | #include <linux/slab.h> |
| 43 | #include <asm/mman.h> |
| 44 | #include <asm/types.h> |
| 45 | #include <asm/uaccess.h> |
| 46 | #include <linux/atomic.h> |
| 47 | #include <asm/vgtod.h> |
| 48 | #include <asm/sys_ia32.h> |
| 49 | |
| 50 | #define AA(__x) ((unsigned long)(__x)) |
| 51 | |
| 52 | |
| 53 | asmlinkage long sys32_truncate64(const char __user *filename, |
| 54 | unsigned long offset_low, |
| 55 | unsigned long offset_high) |
| 56 | { |
| 57 | return sys_truncate(filename, ((loff_t) offset_high << 32) | offset_low); |
| 58 | } |
| 59 | |
| 60 | asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long offset_low, |
| 61 | unsigned long offset_high) |
| 62 | { |
| 63 | return sys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low); |
| 64 | } |
| 65 | |
| 66 | /* |
| 67 | * Another set for IA32/LFS -- x86_64 struct stat is different due to |
| 68 | * support for 64bit inode numbers. |
| 69 | */ |
| 70 | static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat) |
| 71 | { |
| 72 | typeof(ubuf->st_uid) uid = 0; |
| 73 | typeof(ubuf->st_gid) gid = 0; |
| 74 | SET_UID(uid, from_kuid_munged(current_user_ns(), stat->uid)); |
| 75 | SET_GID(gid, from_kgid_munged(current_user_ns(), stat->gid)); |
| 76 | if (!access_ok(VERIFY_WRITE, ubuf, sizeof(struct stat64)) || |
| 77 | __put_user(huge_encode_dev(stat->dev), &ubuf->st_dev) || |
| 78 | __put_user(stat->ino, &ubuf->__st_ino) || |
| 79 | __put_user(stat->ino, &ubuf->st_ino) || |
| 80 | __put_user(stat->mode, &ubuf->st_mode) || |
| 81 | __put_user(stat->nlink, &ubuf->st_nlink) || |
| 82 | __put_user(uid, &ubuf->st_uid) || |
| 83 | __put_user(gid, &ubuf->st_gid) || |
| 84 | __put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev) || |
| 85 | __put_user(stat->size, &ubuf->st_size) || |
| 86 | __put_user(stat->atime.tv_sec, &ubuf->st_atime) || |
| 87 | __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec) || |
| 88 | __put_user(stat->mtime.tv_sec, &ubuf->st_mtime) || |
| 89 | __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec) || |
| 90 | __put_user(stat->ctime.tv_sec, &ubuf->st_ctime) || |
| 91 | __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec) || |
| 92 | __put_user(stat->blksize, &ubuf->st_blksize) || |
| 93 | __put_user(stat->blocks, &ubuf->st_blocks)) |
| 94 | return -EFAULT; |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | asmlinkage long sys32_stat64(const char __user *filename, |
| 99 | struct stat64 __user *statbuf) |
| 100 | { |
| 101 | struct kstat stat; |
| 102 | int ret = vfs_stat(filename, &stat); |
| 103 | |
| 104 | if (!ret) |
| 105 | ret = cp_stat64(statbuf, &stat); |
| 106 | return ret; |
| 107 | } |
| 108 | |
| 109 | asmlinkage long sys32_lstat64(const char __user *filename, |
| 110 | struct stat64 __user *statbuf) |
| 111 | { |
| 112 | struct kstat stat; |
| 113 | int ret = vfs_lstat(filename, &stat); |
| 114 | if (!ret) |
| 115 | ret = cp_stat64(statbuf, &stat); |
| 116 | return ret; |
| 117 | } |
| 118 | |
| 119 | asmlinkage long sys32_fstat64(unsigned int fd, struct stat64 __user *statbuf) |
| 120 | { |
| 121 | struct kstat stat; |
| 122 | int ret = vfs_fstat(fd, &stat); |
| 123 | if (!ret) |
| 124 | ret = cp_stat64(statbuf, &stat); |
| 125 | return ret; |
| 126 | } |
| 127 | |
| 128 | asmlinkage long sys32_fstatat(unsigned int dfd, const char __user *filename, |
| 129 | struct stat64 __user *statbuf, int flag) |
| 130 | { |
| 131 | struct kstat stat; |
| 132 | int error; |
| 133 | |
| 134 | error = vfs_fstatat(dfd, filename, &stat, flag); |
| 135 | if (error) |
| 136 | return error; |
| 137 | return cp_stat64(statbuf, &stat); |
| 138 | } |
| 139 | |
| 140 | /* |
| 141 | * Linux/i386 didn't use to be able to handle more than |
| 142 | * 4 system call parameters, so these system calls used a memory |
| 143 | * block for parameter passing.. |
| 144 | */ |
| 145 | |
| 146 | struct mmap_arg_struct32 { |
| 147 | unsigned int addr; |
| 148 | unsigned int len; |
| 149 | unsigned int prot; |
| 150 | unsigned int flags; |
| 151 | unsigned int fd; |
| 152 | unsigned int offset; |
| 153 | }; |
| 154 | |
| 155 | asmlinkage long sys32_mmap(struct mmap_arg_struct32 __user *arg) |
| 156 | { |
| 157 | struct mmap_arg_struct32 a; |
| 158 | |
| 159 | if (copy_from_user(&a, arg, sizeof(a))) |
| 160 | return -EFAULT; |
| 161 | |
| 162 | if (a.offset & ~PAGE_MASK) |
| 163 | return -EINVAL; |
| 164 | |
| 165 | return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, |
| 166 | a.offset>>PAGE_SHIFT); |
| 167 | } |
| 168 | |
| 169 | asmlinkage long sys32_waitpid(compat_pid_t pid, unsigned int __user *stat_addr, |
| 170 | int options) |
| 171 | { |
| 172 | return compat_sys_wait4(pid, stat_addr, options, NULL); |
| 173 | } |
| 174 | |
| 175 | /* warning: next two assume little endian */ |
| 176 | asmlinkage long sys32_pread(unsigned int fd, char __user *ubuf, u32 count, |
| 177 | u32 poslo, u32 poshi) |
| 178 | { |
| 179 | return sys_pread64(fd, ubuf, count, |
| 180 | ((loff_t)AA(poshi) << 32) | AA(poslo)); |
| 181 | } |
| 182 | |
| 183 | asmlinkage long sys32_pwrite(unsigned int fd, const char __user *ubuf, |
| 184 | u32 count, u32 poslo, u32 poshi) |
| 185 | { |
| 186 | return sys_pwrite64(fd, ubuf, count, |
| 187 | ((loff_t)AA(poshi) << 32) | AA(poslo)); |
| 188 | } |
| 189 | |
| 190 | |
| 191 | /* |
| 192 | * Some system calls that need sign extended arguments. This could be |
| 193 | * done by a generic wrapper. |
| 194 | */ |
| 195 | long sys32_fadvise64_64(int fd, __u32 offset_low, __u32 offset_high, |
| 196 | __u32 len_low, __u32 len_high, int advice) |
| 197 | { |
| 198 | return sys_fadvise64_64(fd, |
| 199 | (((u64)offset_high)<<32) | offset_low, |
| 200 | (((u64)len_high)<<32) | len_low, |
| 201 | advice); |
| 202 | } |
| 203 | |
| 204 | long sys32_vm86_warning(void) |
| 205 | { |
| 206 | struct task_struct *me = current; |
| 207 | static char lastcomm[sizeof(me->comm)]; |
| 208 | |
| 209 | if (strncmp(lastcomm, me->comm, sizeof(lastcomm))) { |
| 210 | compat_printk(KERN_INFO |
| 211 | "%s: vm86 mode not supported on 64 bit kernel\n", |
| 212 | me->comm); |
| 213 | strncpy(lastcomm, me->comm, sizeof(lastcomm)); |
| 214 | } |
| 215 | return -ENOSYS; |
| 216 | } |
| 217 | |
| 218 | asmlinkage ssize_t sys32_readahead(int fd, unsigned off_lo, unsigned off_hi, |
| 219 | size_t count) |
| 220 | { |
| 221 | return sys_readahead(fd, ((u64)off_hi << 32) | off_lo, count); |
| 222 | } |
| 223 | |
| 224 | asmlinkage long sys32_sync_file_range(int fd, unsigned off_low, unsigned off_hi, |
| 225 | unsigned n_low, unsigned n_hi, int flags) |
| 226 | { |
| 227 | return sys_sync_file_range(fd, |
| 228 | ((u64)off_hi << 32) | off_low, |
| 229 | ((u64)n_hi << 32) | n_low, flags); |
| 230 | } |
| 231 | |
| 232 | asmlinkage long sys32_fadvise64(int fd, unsigned offset_lo, unsigned offset_hi, |
| 233 | size_t len, int advice) |
| 234 | { |
| 235 | return sys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo, |
| 236 | len, advice); |
| 237 | } |
| 238 | |
| 239 | asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_lo, |
| 240 | unsigned offset_hi, unsigned len_lo, |
| 241 | unsigned len_hi) |
| 242 | { |
| 243 | return sys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo, |
| 244 | ((u64)len_hi << 32) | len_lo); |
| 245 | } |