1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * arch/arm64/kernel/sys32.c 4 * 5 * Copyright (C) 2015 ARM Ltd. 6 */ 7 8 /* 9 * Needed to avoid conflicting __NR_* macros between uapi/asm/unistd.h and 10 * asm/unistd32.h. 11 */ 12 #define __COMPAT_SYSCALL_NR 13 14 #include <linux/compat.h> 15 #include <linux/compiler.h> 16 #include <linux/syscalls.h> 17 18 #include <asm/syscall.h> 19 20 asmlinkage long compat_sys_sigreturn(void); 21 asmlinkage long compat_sys_rt_sigreturn(void); 22 23 COMPAT_SYSCALL_DEFINE3(aarch32_statfs64, const char __user *, pathname, 24 compat_size_t, sz, struct compat_statfs64 __user *, buf) 25 { 26 /* 27 * 32-bit ARM applies an OABI compatibility fixup to statfs64 and 28 * fstatfs64 regardless of whether OABI is in use, and therefore 29 * arbitrary binaries may rely upon it, so we must do the same. 30 * For more details, see commit: 31 * 32 * 713c481519f19df9 ("[ARM] 3108/2: old ABI compat: statfs64 and 33 * fstatfs64") 34 */ 35 if (sz == 88) 36 sz = 84; 37 38 return kcompat_sys_statfs64(pathname, sz, buf); 39 } 40 41 COMPAT_SYSCALL_DEFINE3(aarch32_fstatfs64, unsigned int, fd, compat_size_t, sz, 42 struct compat_statfs64 __user *, buf) 43 { 44 /* see aarch32_statfs64 */ 45 if (sz == 88) 46 sz = 84; 47 48 return kcompat_sys_fstatfs64(fd, sz, buf); 49 } 50 51 /* 52 * Note: off_4k is always in units of 4K. If we can't do the 53 * requested offset because it is not page-aligned, we return -EINVAL. 54 */ 55 COMPAT_SYSCALL_DEFINE6(aarch32_mmap2, unsigned long, addr, unsigned long, len, 56 unsigned long, prot, unsigned long, flags, 57 unsigned long, fd, unsigned long, off_4k) 58 { 59 if (off_4k & (~PAGE_MASK >> 12)) 60 return -EINVAL; 61 62 off_4k >>= (PAGE_SHIFT - 12); 63 64 return ksys_mmap_pgoff(addr, len, prot, flags, fd, off_4k); 65 } 66 67 #ifdef CONFIG_CPU_BIG_ENDIAN 68 #define arg_u32p(name) u32, name##_hi, u32, name##_lo 69 #else 70 #define arg_u32p(name) u32, name##_lo, u32, name##_hi 71 #endif 72 73 #define arg_u64(name) (((u64)name##_hi << 32) | name##_lo) 74 75 COMPAT_SYSCALL_DEFINE6(aarch32_pread64, unsigned int, fd, char __user *, buf, 76 size_t, count, u32, __pad, arg_u32p(pos)) 77 { 78 return ksys_pread64(fd, buf, count, arg_u64(pos)); 79 } 80 81 COMPAT_SYSCALL_DEFINE6(aarch32_pwrite64, unsigned int, fd, 82 const char __user *, buf, size_t, count, u32, __pad, 83 arg_u32p(pos)) 84 { 85 return ksys_pwrite64(fd, buf, count, arg_u64(pos)); 86 } 87 88 COMPAT_SYSCALL_DEFINE4(aarch32_truncate64, const char __user *, pathname, 89 u32, __pad, arg_u32p(length)) 90 { 91 return ksys_truncate(pathname, arg_u64(length)); 92 } 93 94 COMPAT_SYSCALL_DEFINE4(aarch32_ftruncate64, unsigned int, fd, u32, __pad, 95 arg_u32p(length)) 96 { 97 return ksys_ftruncate(fd, arg_u64(length)); 98 } 99 100 COMPAT_SYSCALL_DEFINE5(aarch32_readahead, int, fd, u32, __pad, 101 arg_u32p(offset), size_t, count) 102 { 103 return ksys_readahead(fd, arg_u64(offset), count); 104 } 105 106 COMPAT_SYSCALL_DEFINE6(aarch32_fadvise64_64, int, fd, int, advice, 107 arg_u32p(offset), arg_u32p(len)) 108 { 109 return ksys_fadvise64_64(fd, arg_u64(offset), arg_u64(len), advice); 110 } 111 112 COMPAT_SYSCALL_DEFINE6(aarch32_sync_file_range2, int, fd, unsigned int, flags, 113 arg_u32p(offset), arg_u32p(nbytes)) 114 { 115 return ksys_sync_file_range(fd, arg_u64(offset), arg_u64(nbytes), 116 flags); 117 } 118 119 COMPAT_SYSCALL_DEFINE6(aarch32_fallocate, int, fd, int, mode, 120 arg_u32p(offset), arg_u32p(len)) 121 { 122 return ksys_fallocate(fd, mode, arg_u64(offset), arg_u64(len)); 123 } 124 125 #undef __SYSCALL 126 #define __SYSCALL(nr, sym) asmlinkage long __arm64_##sym(const struct pt_regs *); 127 #include <asm/unistd32.h> 128 129 #undef __SYSCALL 130 #define __SYSCALL(nr, sym) [nr] = __arm64_##sym, 131 132 const syscall_fn_t compat_sys_call_table[__NR_compat_syscalls] = { 133 [0 ... __NR_compat_syscalls - 1] = __arm64_sys_ni_syscall, 134 #include <asm/unistd32.h> 135 }; 136