1 /* 2 * Conversion between 32-bit and 64-bit native system calls. 3 * 4 * Copyright (C) 2000 Silicon Graphics, Inc. 5 * Written by Ulf Carlsson ([email protected]) 6 */ 7 #include <linux/compiler.h> 8 #include <linux/mm.h> 9 #include <linux/errno.h> 10 #include <linux/file.h> 11 #include <linux/highuid.h> 12 #include <linux/resource.h> 13 #include <linux/highmem.h> 14 #include <linux/time.h> 15 #include <linux/times.h> 16 #include <linux/poll.h> 17 #include <linux/skbuff.h> 18 #include <linux/filter.h> 19 #include <linux/shm.h> 20 #include <linux/sem.h> 21 #include <linux/msg.h> 22 #include <linux/icmpv6.h> 23 #include <linux/syscalls.h> 24 #include <linux/sysctl.h> 25 #include <linux/utime.h> 26 #include <linux/utsname.h> 27 #include <linux/personality.h> 28 #include <linux/dnotify.h> 29 #include <linux/module.h> 30 #include <linux/binfmts.h> 31 #include <linux/security.h> 32 #include <linux/compat.h> 33 #include <linux/vfs.h> 34 #include <linux/ipc.h> 35 #include <linux/slab.h> 36 37 #include <net/sock.h> 38 #include <net/scm.h> 39 40 #include <asm/compat-signal.h> 41 #include <asm/sim.h> 42 #include <asm/uaccess.h> 43 #include <asm/mmu_context.h> 44 #include <asm/mman.h> 45 46 /* Use this to get at 32-bit user passed pointers. */ 47 /* A() macro should be used for places where you e.g. 48 have some internal variable u32 and just want to get 49 rid of a compiler warning. AA() has to be used in 50 places where you want to convert a function argument 51 to 32bit pointer or when you e.g. access pt_regs 52 structure and want to consider 32bit registers only. 53 */ 54 #define A(__x) ((unsigned long)(__x)) 55 #define AA(__x) ((unsigned long)((int)__x)) 56 57 #ifdef __MIPSEB__ 58 #define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL)) 59 #endif 60 #ifdef __MIPSEL__ 61 #define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL)) 62 #endif 63 64 SYSCALL_DEFINE6(32_mmap2, unsigned long, addr, unsigned long, len, 65 unsigned long, prot, unsigned long, flags, unsigned long, fd, 66 unsigned long, pgoff) 67 { 68 unsigned long error; 69 70 error = -EINVAL; 71 if (pgoff & (~PAGE_MASK >> 12)) 72 goto out; 73 error = sys_mmap_pgoff(addr, len, prot, flags, fd, 74 pgoff >> (PAGE_SHIFT-12)); 75 out: 76 return error; 77 } 78 79 #define RLIM_INFINITY32 0x7fffffff 80 #define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x) 81 82 struct rlimit32 { 83 int rlim_cur; 84 int rlim_max; 85 }; 86 87 SYSCALL_DEFINE4(32_truncate64, const char __user *, path, 88 unsigned long, __dummy, unsigned long, a2, unsigned long, a3) 89 { 90 return sys_truncate(path, merge_64(a2, a3)); 91 } 92 93 SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy, 94 unsigned long, a2, unsigned long, a3) 95 { 96 return sys_ftruncate(fd, merge_64(a2, a3)); 97 } 98 99 SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high, 100 unsigned int, offset_low, loff_t __user *, result, 101 unsigned int, origin) 102 { 103 return sys_llseek(fd, offset_high, offset_low, result, origin); 104 } 105 106 /* From the Single Unix Spec: pread & pwrite act like lseek to pos + op + 107 lseek back to original location. They fail just like lseek does on 108 non-seekable files. */ 109 110 SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count, 111 unsigned long, unused, unsigned long, a4, unsigned long, a5) 112 { 113 return sys_pread64(fd, buf, count, merge_64(a4, a5)); 114 } 115 116 SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf, 117 size_t, count, u32, unused, u64, a4, u64, a5) 118 { 119 return sys_pwrite64(fd, buf, count, merge_64(a4, a5)); 120 } 121 122 #ifdef CONFIG_MIPS32_N32 123 SYSCALL_DEFINE4(n32_semctl, int, semid, int, semnum, int, cmd, u32, arg) 124 { 125 /* compat_sys_semctl expects a pointer to union semun */ 126 u32 __user *uptr = compat_alloc_user_space(sizeof(u32)); 127 if (put_user(arg, uptr)) 128 return -EFAULT; 129 return compat_sys_semctl(semid, semnum, cmd, uptr); 130 } 131 132 SYSCALL_DEFINE4(n32_msgsnd, int, msqid, u32, msgp, unsigned int, msgsz, 133 int, msgflg) 134 { 135 return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp)); 136 } 137 138 SYSCALL_DEFINE5(n32_msgrcv, int, msqid, u32, msgp, size_t, msgsz, 139 int, msgtyp, int, msgflg) 140 { 141 return compat_sys_msgrcv(msqid, msgsz, msgtyp, msgflg, IPC_64, 142 compat_ptr(msgp)); 143 } 144 #endif 145 146 SYSCALL_DEFINE1(32_personality, unsigned long, personality) 147 { 148 unsigned int p = personality & 0xffffffff; 149 int ret; 150 151 if (personality(current->personality) == PER_LINUX32 && 152 personality(p) == PER_LINUX) 153 p = (p & ~PER_MASK) | PER_LINUX32; 154 ret = sys_personality(p); 155 if (ret != -1 && personality(ret) == PER_LINUX32) 156 ret = (ret & ~PER_MASK) | PER_LINUX; 157 return ret; 158 } 159 160 asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3, 161 size_t count) 162 { 163 return sys_readahead(fd, merge_64(a2, a3), count); 164 } 165 166 asmlinkage long sys32_sync_file_range(int fd, int __pad, 167 unsigned long a2, unsigned long a3, 168 unsigned long a4, unsigned long a5, 169 int flags) 170 { 171 return sys_sync_file_range(fd, 172 merge_64(a2, a3), merge_64(a4, a5), 173 flags); 174 } 175 176 asmlinkage long sys32_fadvise64_64(int fd, int __pad, 177 unsigned long a2, unsigned long a3, 178 unsigned long a4, unsigned long a5, 179 int flags) 180 { 181 return sys_fadvise64_64(fd, 182 merge_64(a2, a3), merge_64(a4, a5), 183 flags); 184 } 185 186 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2, 187 unsigned offset_a3, unsigned len_a4, unsigned len_a5) 188 { 189 return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3), 190 merge_64(len_a4, len_a5)); 191 } 192 193 SYSCALL_DEFINE6(32_fanotify_mark, int, fanotify_fd, unsigned int, flags, 194 u64, a3, u64, a4, int, dfd, const char __user *, pathname) 195 { 196 return sys_fanotify_mark(fanotify_fd, flags, merge_64(a3, a4), 197 dfd, pathname); 198 } 199