1//===-- sanitizer_syscall_linux_aarch64.inc --------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// Implementations of internal_syscall and internal_iserror for Linux/aarch64.
10//
11//===----------------------------------------------------------------------===//
12
13#define SYSCALL(name) __NR_ ## name
14
15static uptr __internal_syscall(u64 nr) {
16 register u64 x8 asm("x8") = nr;
17 register u64 x0 asm("x0");
18 asm volatile("svc 0"
19 : "=r"(x0)
20 : "r"(x8)
21 : "memory", "cc");
22 return x0;
23}
24#define __internal_syscall0(n) \
25 (__internal_syscall)(n)
26
27static uptr __internal_syscall(u64 nr, u64 arg1) {
28 register u64 x8 asm("x8") = nr;
29 register u64 x0 asm("x0") = arg1;
30 asm volatile("svc 0"
31 : "=r"(x0)
32 : "r"(x8), "0"(x0)
33 : "memory", "cc");
34 return x0;
35}
36#define __internal_syscall1(n, a1) \
37 (__internal_syscall)(n, (u64)(a1))
38
39static uptr __internal_syscall(u64 nr, u64 arg1, long arg2) {
40 register u64 x8 asm("x8") = nr;
41 register u64 x0 asm("x0") = arg1;
42 register u64 x1 asm("x1") = arg2;
43 asm volatile("svc 0"
44 : "=r"(x0)
45 : "r"(x8), "0"(x0), "r"(x1)
46 : "memory", "cc");
47 return x0;
48}
49#define __internal_syscall2(n, a1, a2) \
50 (__internal_syscall)(n, (u64)(a1), (long)(a2))
51
52static uptr __internal_syscall(u64 nr, u64 arg1, long arg2, long arg3) {
53 register u64 x8 asm("x8") = nr;
54 register u64 x0 asm("x0") = arg1;
55 register u64 x1 asm("x1") = arg2;
56 register u64 x2 asm("x2") = arg3;
57 asm volatile("svc 0"
58 : "=r"(x0)
59 : "r"(x8), "0"(x0), "r"(x1), "r"(x2)
60 : "memory", "cc");
61 return x0;
62}
63#define __internal_syscall3(n, a1, a2, a3) \
64 (__internal_syscall)(n, (u64)(a1), (long)(a2), (long)(a3))
65
66static uptr __internal_syscall(u64 nr, u64 arg1, long arg2, long arg3,
67 u64 arg4) {
68 register u64 x8 asm("x8") = nr;
69 register u64 x0 asm("x0") = arg1;
70 register u64 x1 asm("x1") = arg2;
71 register u64 x2 asm("x2") = arg3;
72 register u64 x3 asm("x3") = arg4;
73 asm volatile("svc 0"
74 : "=r"(x0)
75 : "r"(x8), "0"(x0), "r"(x1), "r"(x2), "r"(x3)
76 : "memory", "cc");
77 return x0;
78}
79#define __internal_syscall4(n, a1, a2, a3, a4) \
80 (__internal_syscall)(n, (u64)(a1), (long)(a2), (long)(a3), (long)(a4))
81
82static uptr __internal_syscall(u64 nr, u64 arg1, long arg2, long arg3,
83 u64 arg4, long arg5) {
84 register u64 x8 asm("x8") = nr;
85 register u64 x0 asm("x0") = arg1;
86 register u64 x1 asm("x1") = arg2;
87 register u64 x2 asm("x2") = arg3;
88 register u64 x3 asm("x3") = arg4;
89 register u64 x4 asm("x4") = arg5;
90 asm volatile("svc 0"
91 : "=r"(x0)
92 : "r"(x8), "0"(x0), "r"(x1), "r"(x2), "r"(x3), "r"(x4)
93 : "memory", "cc");
94 return x0;
95}
96#define __internal_syscall5(n, a1, a2, a3, a4, a5) \
97 (__internal_syscall)(n, (u64)(a1), (long)(a2), (long)(a3), (long)(a4), \
98 (u64)(a5))
99
100static uptr __internal_syscall(u64 nr, u64 arg1, long arg2, long arg3,
101 u64 arg4, long arg5, long arg6) {
102 register u64 x8 asm("x8") = nr;
103 register u64 x0 asm("x0") = arg1;
104 register u64 x1 asm("x1") = arg2;
105 register u64 x2 asm("x2") = arg3;
106 register u64 x3 asm("x3") = arg4;
107 register u64 x4 asm("x4") = arg5;
108 register u64 x5 asm("x5") = arg6;
109 asm volatile("svc 0"
110 : "=r"(x0)
111 : "r"(x8), "0"(x0), "r"(x1), "r"(x2), "r"(x3), "r"(x4), "r"(x5)
112 : "memory", "cc");
113 return x0;
114}
115#define __internal_syscall6(n, a1, a2, a3, a4, a5, a6) \
116 (__internal_syscall)(n, (u64)(a1), (long)(a2), (long)(a3), (long)(a4), \
117 (u64)(a5), (long)(a6))
118
119#define __SYSCALL_NARGS_X(a1, a2, a3, a4, a5, a6, a7, a8, n, ...) n
120#define __SYSCALL_NARGS(...) \
121 __SYSCALL_NARGS_X(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0, )
122#define __SYSCALL_CONCAT_X(a, b) a##b
123#define __SYSCALL_CONCAT(a, b) __SYSCALL_CONCAT_X(a, b)
124#define __SYSCALL_DISP(b, ...) \
125 __SYSCALL_CONCAT(b, __SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__)
126
127#define internal_syscall(...) __SYSCALL_DISP(__internal_syscall, __VA_ARGS__)
128
129// Helper function used to avoid cobbler errno.
130bool internal_iserror(uptr retval, int *rverrno) {
131 if (retval >= (uptr)-4095) {
132 if (rverrno)
133 *rverrno = -retval;
134 return true;
135 }
136 return false;
137}