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 #include <asm/syscalls.h> 46 47 #ifdef __MIPSEB__ 48 #define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL)) 49 #endif 50 #ifdef __MIPSEL__ 51 #define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL)) 52 #endif 53 54 SYSCALL_DEFINE4(32_truncate64, const char __user *, path, 55 unsigned long, __dummy, unsigned long, a2, unsigned long, a3) 56 { 57 return ksys_truncate(path, merge_64(a2, a3)); 58 } 59 60 SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy, 61 unsigned long, a2, unsigned long, a3) 62 { 63 return ksys_ftruncate(fd, merge_64(a2, a3)); 64 } 65 66 SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high, 67 unsigned int, offset_low, loff_t __user *, result, 68 unsigned int, origin) 69 { 70 return sys_llseek(fd, offset_high, offset_low, result, origin); 71 } 72 73 /* From the Single Unix Spec: pread & pwrite act like lseek to pos + op + 74 lseek back to original location. They fail just like lseek does on 75 non-seekable files. */ 76 77 SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count, 78 unsigned long, unused, unsigned long, a4, unsigned long, a5) 79 { 80 return ksys_pread64(fd, buf, count, merge_64(a4, a5)); 81 } 82 83 SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf, 84 size_t, count, u32, unused, u64, a4, u64, a5) 85 { 86 return ksys_pwrite64(fd, buf, count, merge_64(a4, a5)); 87 } 88 89 SYSCALL_DEFINE1(32_personality, unsigned long, personality) 90 { 91 unsigned int p = personality & 0xffffffff; 92 int ret; 93 94 if (personality(current->personality) == PER_LINUX32 && 95 personality(p) == PER_LINUX) 96 p = (p & ~PER_MASK) | PER_LINUX32; 97 ret = sys_personality(p); 98 if (ret != -1 && personality(ret) == PER_LINUX32) 99 ret = (ret & ~PER_MASK) | PER_LINUX; 100 return ret; 101 } 102 103 asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3, 104 size_t count) 105 { 106 return ksys_readahead(fd, merge_64(a2, a3), count); 107 } 108 109 asmlinkage long sys32_sync_file_range(int fd, int __pad, 110 unsigned long a2, unsigned long a3, 111 unsigned long a4, unsigned long a5, 112 int flags) 113 { 114 return ksys_sync_file_range(fd, 115 merge_64(a2, a3), merge_64(a4, a5), 116 flags); 117 } 118 119 asmlinkage long sys32_fadvise64_64(int fd, int __pad, 120 unsigned long a2, unsigned long a3, 121 unsigned long a4, unsigned long a5, 122 int flags) 123 { 124 return ksys_fadvise64_64(fd, 125 merge_64(a2, a3), merge_64(a4, a5), 126 flags); 127 } 128 129 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2, 130 unsigned offset_a3, unsigned len_a4, unsigned len_a5) 131 { 132 return ksys_fallocate(fd, mode, merge_64(offset_a2, offset_a3), 133 merge_64(len_a4, len_a5)); 134 } 135