sanitizer_syscall_linux_x86_64.inc revision 0c8af33262be025def2108352f9a720d9559ffdb 
1//===-- sanitizer_syscall_linux_x86_64.inc ----------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// Implementations of internal_syscall and internal_iserror for Linux/x86_64.
11//
12//===----------------------------------------------------------------------===//
13
14static uptr internal_syscall(u64 nr) {
15  u64 retval;
16  asm volatile("syscall" : "=a"(retval) : "a"(nr) : "rcx", "r11",
17               "memory", "cc");
18  return retval;
19}
20
21template <typename T1>
22static uptr internal_syscall(u64 nr, T1 arg1) {
23  u64 retval;
24  asm volatile("syscall" : "=a"(retval) : "a"(nr), "D"((u64)arg1) :
25               "rcx", "r11", "memory", "cc");
26  return retval;
27}
28
29template <typename T1, typename T2>
30static uptr internal_syscall(u64 nr, T1 arg1, T2 arg2) {
31  u64 retval;
32  asm volatile("syscall" : "=a"(retval) : "a"(nr), "D"((u64)arg1),
33               "S"((u64)arg2) : "rcx", "r11", "memory", "cc");
34  return retval;
35}
36
37template <typename T1, typename T2, typename T3>
38static uptr internal_syscall(u64 nr, T1 arg1, T2 arg2, T3 arg3) {
39  u64 retval;
40  asm volatile("syscall" : "=a"(retval) : "a"(nr), "D"((u64)arg1),
41               "S"((u64)arg2), "d"((u64)arg3) : "rcx", "r11", "memory", "cc");
42  return retval;
43}
44
45template <typename T1, typename T2, typename T3, typename T4>
46static uptr internal_syscall(u64 nr, T1 arg1, T2 arg2, T3 arg3, T4 arg4) {
47  u64 retval;
48  asm volatile("mov %5, %%r10;"
49               "syscall" : "=a"(retval) : "a"(nr), "D"((u64)arg1),
50               "S"((u64)arg2), "d"((u64)arg3), "r"((u64)arg4) :
51               "rcx", "r11", "r10", "memory", "cc");
52  return retval;
53}
54
55template <typename T1, typename T2, typename T3, typename T4, typename T5>
56static uptr internal_syscall(u64 nr, T1 arg1, T2 arg2, T3 arg3, T4 arg4,
57                             T5 arg5) {
58  u64 retval;
59  asm volatile("mov %5, %%r10;"
60               "mov %6, %%r8;"
61               "syscall" : "=a"(retval) : "a"(nr), "D"((u64)arg1),
62               "S"((u64)arg2), "d"((u64)arg3), "r"((u64)arg4), "r"((u64)arg5) :
63               "rcx", "r11", "r10", "r8", "memory", "cc");
64  return retval;
65}
66
67template <typename T1, typename T2, typename T3, typename T4, typename T5,
68          typename T6>
69static uptr internal_syscall(u64 nr, T1 arg1, T2 arg2, T3 arg3, T4 arg4,
70                             T5 arg5, T6 arg6) {
71  u64 retval;
72  asm volatile("mov %5, %%r10;"
73               "mov %6, %%r8;"
74               "mov %7, %%r9;"
75               "syscall" : "=a"(retval) : "a"(nr), "D"((u64)arg1),
76               "S"((u64)arg2), "d"((u64)arg3), "r"((u64)arg4), "r"((u64)arg5),
77               "r"((u64)arg6) : "rcx", "r11", "r10", "r8", "r9",
78               "memory", "cc");
79  return retval;
80}
81
82bool internal_iserror(uptr retval, int *rverrno) {
83  if (retval >= (uptr)-4095) {
84    if (rverrno)
85      *rverrno = -retval;
86    return true;
87  }
88  return false;
89}
90