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 (ulfc@engr.sgi.com) 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/binfmts.h> 30 #include <linux/security.h> 31 #include <linux/compat.h> 32 #include <linux/vfs.h> 33 #include <linux/ipc.h> 34 #include <linux/slab.h> 35 36 #include <net/sock.h> 37 #include <net/scm.h> 38 39 #include <asm/compat-signal.h> 40 #include <asm/sim.h> 41 #include <asm/uaccess.h> 42 #include <asm/mmu_context.h> 43 #include <asm/mman.h> 44 45 /* Use this to get at 32-bit user passed pointers. */ 46 /* A() macro should be used for places where you e.g. 47 have some internal variable u32 and just want to get 48 rid of a compiler warning. AA() has to be used in 49 places where you want to convert a function argument 50 to 32bit pointer or when you e.g. access pt_regs 51 structure and want to consider 32bit registers only. 52 */ 53 #define A(__x) ((unsigned long)(__x)) 54 #define AA(__x) ((unsigned long)((int)__x)) 55 56 #ifdef __MIPSEB__ 57 #define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL)) 58 #endif 59 #ifdef __MIPSEL__ 60 #define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL)) 61 #endif 62 63 SYSCALL_DEFINE6(32_mmap2, unsigned long, addr, unsigned long, len, 64 unsigned long, prot, unsigned long, flags, unsigned long, fd, 65 unsigned long, pgoff) 66 { 67 unsigned long error; 68 69 error = -EINVAL; 70 if (pgoff & (~PAGE_MASK >> 12)) 71 goto out; 72 error = sys_mmap_pgoff(addr, len, prot, flags, fd, 73 pgoff >> (PAGE_SHIFT-12)); 74 out: 75 return error; 76 } 77 78 #define RLIM_INFINITY32 0x7fffffff 79 #define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x) 80 81 struct rlimit32 { 82 int rlim_cur; 83 int rlim_max; 84 }; 85 86 SYSCALL_DEFINE4(32_truncate64, const char __user *, path, 87 unsigned long, __dummy, unsigned long, a2, unsigned long, a3) 88 { 89 return sys_truncate(path, merge_64(a2, a3)); 90 } 91 92 SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy, 93 unsigned long, a2, unsigned long, a3) 94 { 95 return sys_ftruncate(fd, merge_64(a2, a3)); 96 } 97 98 SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high, 99 unsigned int, offset_low, loff_t __user *, result, 100 unsigned int, origin) 101 { 102 return sys_llseek(fd, offset_high, offset_low, result, origin); 103 } 104 105 /* From the Single Unix Spec: pread & pwrite act like lseek to pos + op + 106 lseek back to original location. They fail just like lseek does on 107 non-seekable files. */ 108 109 SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count, 110 unsigned long, unused, unsigned long, a4, unsigned long, a5) 111 { 112 return sys_pread64(fd, buf, count, merge_64(a4, a5)); 113 } 114 115 SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf, 116 size_t, count, u32, unused, u64, a4, u64, a5) 117 { 118 return sys_pwrite64(fd, buf, count, merge_64(a4, a5)); 119 } 120 121 SYSCALL_DEFINE1(32_personality, unsigned long, personality) 122 { 123 unsigned int p = personality & 0xffffffff; 124 int ret; 125 126 if (personality(current->personality) == PER_LINUX32 && 127 personality(p) == PER_LINUX) 128 p = (p & ~PER_MASK) | PER_LINUX32; 129 ret = sys_personality(p); 130 if (ret != -1 && personality(ret) == PER_LINUX32) 131 ret = (ret & ~PER_MASK) | PER_LINUX; 132 return ret; 133 } 134 135 asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3, 136 size_t count) 137 { 138 return sys_readahead(fd, merge_64(a2, a3), count); 139 } 140 141 asmlinkage long sys32_sync_file_range(int fd, int __pad, 142 unsigned long a2, unsigned long a3, 143 unsigned long a4, unsigned long a5, 144 int flags) 145 { 146 return sys_sync_file_range(fd, 147 merge_64(a2, a3), merge_64(a4, a5), 148 flags); 149 } 150 151 asmlinkage long sys32_fadvise64_64(int fd, int __pad, 152 unsigned long a2, unsigned long a3, 153 unsigned long a4, unsigned long a5, 154 int flags) 155 { 156 return sys_fadvise64_64(fd, 157 merge_64(a2, a3), merge_64(a4, a5), 158 flags); 159 } 160 161 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2, 162 unsigned offset_a3, unsigned len_a4, unsigned len_a5) 163 { 164 return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3), 165 merge_64(len_a4, len_a5)); 166 } 167