libsanitizer/sanitizer_common/sanitizer_syscall_linux_aarch64.inc

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