1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Conversion between 32-bit and 64-bit native system calls. 4 * 5 * Copyright (C) 2000 Silicon Graphics, Inc. 6 * Written by Ulf Carlsson (ulfc@engr.sgi.com) 7 */ 8 #include <linux/compiler.h> 9 #include <linux/mm.h> 10 #include <linux/errno.h> 11 #include <linux/file.h> 12 #include <linux/highuid.h> 13 #include <linux/resource.h> 14 #include <linux/highmem.h> 15 #include <linux/time.h> 16 #include <linux/times.h> 17 #include <linux/poll.h> 18 #include <linux/skbuff.h> 19 #include <linux/filter.h> 20 #include <linux/shm.h> 21 #include <linux/sem.h> 22 #include <linux/msg.h> 23 #include <linux/icmpv6.h> 24 #include <linux/syscalls.h> 25 #include <linux/sysctl.h> 26 #include <linux/utime.h> 27 #include <linux/utsname.h> 28 #include <linux/personality.h> 29 #include <linux/dnotify.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 <linux/uaccess.h> 43 #include <asm/mmu_context.h> 44 #include <asm/mman.h> 45 46 #ifdef __MIPSEB__ 47 #define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL)) 48 #endif 49 #ifdef __MIPSEL__ 50 #define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL)) 51 #endif 52 53 SYSCALL_DEFINE4(32_truncate64, const char __user *, path, 54 unsigned long, __dummy, unsigned long, a2, unsigned long, a3) 55 { 56 return ksys_truncate(path, merge_64(a2, a3)); 57 } 58 59 SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy, 60 unsigned long, a2, unsigned long, a3) 61 { 62 return ksys_ftruncate(fd, merge_64(a2, a3)); 63 } 64 65 SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high, 66 unsigned int, offset_low, loff_t __user *, result, 67 unsigned int, origin) 68 { 69 return sys_llseek(fd, offset_high, offset_low, result, origin); 70 } 71 72 /* From the Single Unix Spec: pread & pwrite act like lseek to pos + op + 73 lseek back to original location. They fail just like lseek does on 74 non-seekable files. */ 75 76 SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count, 77 unsigned long, unused, unsigned long, a4, unsigned long, a5) 78 { 79 return ksys_pread64(fd, buf, count, merge_64(a4, a5)); 80 } 81 82 SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf, 83 size_t, count, u32, unused, u64, a4, u64, a5) 84 { 85 return ksys_pwrite64(fd, buf, count, merge_64(a4, a5)); 86 } 87 88 SYSCALL_DEFINE1(32_personality, unsigned long, personality) 89 { 90 unsigned int p = personality & 0xffffffff; 91 int ret; 92 93 if (personality(current->personality) == PER_LINUX32 && 94 personality(p) == PER_LINUX) 95 p = (p & ~PER_MASK) | PER_LINUX32; 96 ret = sys_personality(p); 97 if (ret != -1 && personality(ret) == PER_LINUX32) 98 ret = (ret & ~PER_MASK) | PER_LINUX; 99 return ret; 100 } 101 102 asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3, 103 size_t count) 104 { 105 return ksys_readahead(fd, merge_64(a2, a3), count); 106 } 107 108 asmlinkage long sys32_sync_file_range(int fd, int __pad, 109 unsigned long a2, unsigned long a3, 110 unsigned long a4, unsigned long a5, 111 int flags) 112 { 113 return ksys_sync_file_range(fd, 114 merge_64(a2, a3), merge_64(a4, a5), 115 flags); 116 } 117 118 asmlinkage long sys32_fadvise64_64(int fd, int __pad, 119 unsigned long a2, unsigned long a3, 120 unsigned long a4, unsigned long a5, 121 int flags) 122 { 123 return ksys_fadvise64_64(fd, 124 merge_64(a2, a3), merge_64(a4, a5), 125 flags); 126 } 127 128 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2, 129 unsigned offset_a3, unsigned len_a4, unsigned len_a5) 130 { 131 return ksys_fallocate(fd, mode, merge_64(offset_a2, offset_a3), 132 merge_64(len_a4, len_a5)); 133 } 134