1//===-- sanitizer_syscall_linux_hexagon.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/hexagon.
10//
11//===----------------------------------------------------------------------===//
12
13#define SYSCALL(name) __NR_##name
14
15#define __internal_syscall_LL_E(x) \
16  ((union {                        \
17    long long ll;                  \
18    long l[2];                     \
19  }){.ll = x})                     \
20      .l[0],                       \
21      ((union {                    \
22        long long ll;              \
23        long l[2];                 \
24      }){.ll = x})                 \
25          .l[1]
26#define __internal_syscall_LL_O(x) 0, __SYSCALL_LL_E((x))
27
28#define __asm_syscall(...)                                                 \
29  do {                                                                     \
30    __asm__ __volatile__("trap0(#1)" : "=r"(r0) : __VA_ARGS__ : "memory"); \
31    return r0;                                                             \
32  } while (0)
33
34#define __internal_syscall0(n) (__internal_syscall)(n)
35
36static uptr __internal_syscall(long n) {
37  register u32 r6 __asm__("r6") = n;
38  register u32 r0 __asm__("r0");
39  __asm_syscall("r"(r6));
40}
41
42#define __internal_syscall1(n, a1) (__internal_syscall)(n, (long)(a1))
43
44static uptr __internal_syscall(long n, long a) {
45  register u32 r6 __asm__("r6") = n;
46  register u32 r0 __asm__("r0") = a;
47  __asm_syscall("r"(r6), "0"(r0));
48}
49
50#define __internal_syscall2(n, a1, a2) \
51  (__internal_syscall)(n, (long)(a1), (long)(a2))
52
53static uptr __internal_syscall(long n, long a, long b) {
54  register u32 r6 __asm__("r6") = n;
55  register u32 r0 __asm__("r0") = a;
56  register u32 r1 __asm__("r1") = b;
57  __asm_syscall("r"(r6), "0"(r0), "r"(r1));
58}
59
60#define __internal_syscall3(n, a1, a2, a3) \
61  (__internal_syscall)(n, (long)(a1), (long)(a2), (long)(a3))
62
63static uptr __internal_syscall(long n, long a, long b, long c) {
64  register u32 r6 __asm__("r6") = n;
65  register u32 r0 __asm__("r0") = a;
66  register u32 r1 __asm__("r1") = b;
67  register u32 r2 __asm__("r2") = c;
68  __asm_syscall("r"(r6), "0"(r0), "r"(r1), "r"(r2));
69}
70
71#define __internal_syscall4(n, a1, a2, a3, a4) \
72  (__internal_syscall)(n, (long)(a1), (long)(a2), (long)(a3), (long)(a4))
73
74static uptr __internal_syscall(long n, long a, long b, long c, long d) {
75  register u32 r6 __asm__("r6") = n;
76  register u32 r0 __asm__("r0") = a;
77  register u32 r1 __asm__("r1") = b;
78  register u32 r2 __asm__("r2") = c;
79  register u32 r3 __asm__("r3") = d;
80  __asm_syscall("r"(r6), "0"(r0), "r"(r1), "r"(r2), "r"(r3));
81}
82
83#define __internal_syscall5(n, a1, a2, a3, a4, a5)                        \
84  (__internal_syscall)(n, (long)(a1), (long)(a2), (long)(a3), (long)(a4), \
85                       (long)(a5))
86
87static uptr __internal_syscall(long n, long a, long b, long c, long d, long e) {
88  register u32 r6 __asm__("r6") = n;
89  register u32 r0 __asm__("r0") = a;
90  register u32 r1 __asm__("r1") = b;
91  register u32 r2 __asm__("r2") = c;
92  register u32 r3 __asm__("r3") = d;
93  register u32 r4 __asm__("r4") = e;
94  __asm_syscall("r"(r6), "0"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4));
95}
96
97#define __internal_syscall6(n, a1, a2, a3, a4, a5, a6)                    \
98  (__internal_syscall)(n, (long)(a1), (long)(a2), (long)(a3), (long)(a4), \
99                       (long)(a5), (long)(a6))
100
101static uptr __internal_syscall(long n, long a, long b, long c, long d, long e,
102                               long f) {
103  register u32 r6 __asm__("r6") = n;
104  register u32 r0 __asm__("r0") = a;
105  register u32 r1 __asm__("r1") = b;
106  register u32 r2 __asm__("r2") = c;
107  register u32 r3 __asm__("r3") = d;
108  register u32 r4 __asm__("r4") = e;
109  register u32 r5 __asm__("r5") = f;
110  __asm_syscall("r"(r6), "0"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r5));
111}
112
113#define __SYSCALL_NARGS_X(a1, a2, a3, a4, a5, a6, a7, a8, n, ...) n
114#define __SYSCALL_NARGS(...) \
115  __SYSCALL_NARGS_X(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0, )
116#define __SYSCALL_CONCAT_X(a, b) a##b
117#define __SYSCALL_CONCAT(a, b) __SYSCALL_CONCAT_X(a, b)
118#define __SYSCALL_DISP(b, ...) \
119  __SYSCALL_CONCAT(b, __SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__)
120
121#define internal_syscall(...) __SYSCALL_DISP(__internal_syscall, __VA_ARGS__)
122
123// Helper function used to avoid clobbering of errno.
124bool internal_iserror(uptr retval, int *rverrno) {
125  if (retval >= (uptr)-4095) {
126    if (rverrno)
127      *rverrno = -retval;
128    return true;
129  }
130  return false;
131}
132