172 lines · plain
1//===-- sanitizer_syscall_linux_loongarch64.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-exception6//7//===----------------------------------------------------------------------===//8//9// Implementations of internal_syscall and internal_iserror for10// Linux/loongarch64.11//12//===----------------------------------------------------------------------===//13 14// About local register variables:15// https://gcc.gnu.org/onlinedocs/gcc/Local-Register-Variables.html#Local-Register-Variables16//17// Kernel ABI:18// https://lore.kernel.org/loongarch/1f353678-3398-e30b-1c87-6edb278f74db@xen0n.name/T/#m1613bc86c2d7bf5f6da92bd62984302bfd699a2f19// syscall number is placed in a720// parameters, if present, are placed in a0-a621// upon return:22// the return value is placed in a023// t0-t8 should be considered clobbered24// all other registers are preserved25#define SYSCALL(name) __NR_##name26 27#define INTERNAL_SYSCALL_CLOBBERS \28 "memory", "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8"29 30static uptr __internal_syscall(u64 nr) {31 register u64 a7 asm("$a7") = nr;32 register u64 a0 asm("$a0");33 __asm__ volatile("syscall 0\n\t"34 : "=r"(a0)35 : "r"(a7)36 : INTERNAL_SYSCALL_CLOBBERS);37 return a0;38}39#define __internal_syscall0(n) (__internal_syscall)(n)40 41static uptr __internal_syscall(u64 nr, u64 arg1) {42 register u64 a7 asm("$a7") = nr;43 register u64 a0 asm("$a0") = arg1;44 __asm__ volatile("syscall 0\n\t"45 : "+r"(a0)46 : "r"(a7)47 : INTERNAL_SYSCALL_CLOBBERS);48 return a0;49}50#define __internal_syscall1(n, a1) (__internal_syscall)(n, (u64)(a1))51 52static uptr __internal_syscall(u64 nr, u64 arg1, long arg2) {53 register u64 a7 asm("$a7") = nr;54 register u64 a0 asm("$a0") = arg1;55 register u64 a1 asm("$a1") = arg2;56 __asm__ volatile("syscall 0\n\t"57 : "+r"(a0)58 : "r"(a7), "r"(a1)59 : INTERNAL_SYSCALL_CLOBBERS);60 return a0;61}62#define __internal_syscall2(n, a1, a2) \63 (__internal_syscall)(n, (u64)(a1), (long)(a2))64 65static uptr __internal_syscall(u64 nr, u64 arg1, long arg2, long arg3) {66 register u64 a7 asm("$a7") = nr;67 register u64 a0 asm("$a0") = arg1;68 register u64 a1 asm("$a1") = arg2;69 register u64 a2 asm("$a2") = arg3;70 __asm__ volatile("syscall 0\n\t"71 : "+r"(a0)72 : "r"(a7), "r"(a1), "r"(a2)73 : INTERNAL_SYSCALL_CLOBBERS);74 return a0;75}76#define __internal_syscall3(n, a1, a2, a3) \77 (__internal_syscall)(n, (u64)(a1), (long)(a2), (long)(a3))78 79static uptr __internal_syscall(u64 nr, u64 arg1, long arg2, long arg3,80 u64 arg4) {81 register u64 a7 asm("$a7") = nr;82 register u64 a0 asm("$a0") = arg1;83 register u64 a1 asm("$a1") = arg2;84 register u64 a2 asm("$a2") = arg3;85 register u64 a3 asm("$a3") = arg4;86 __asm__ volatile("syscall 0\n\t"87 : "+r"(a0)88 : "r"(a7), "r"(a1), "r"(a2), "r"(a3)89 : INTERNAL_SYSCALL_CLOBBERS);90 return a0;91}92#define __internal_syscall4(n, a1, a2, a3, a4) \93 (__internal_syscall)(n, (u64)(a1), (long)(a2), (long)(a3), (long)(a4))94 95static uptr __internal_syscall(u64 nr, u64 arg1, long arg2, long arg3, u64 arg4,96 long arg5) {97 register u64 a7 asm("$a7") = nr;98 register u64 a0 asm("$a0") = arg1;99 register u64 a1 asm("$a1") = arg2;100 register u64 a2 asm("$a2") = arg3;101 register u64 a3 asm("$a3") = arg4;102 register u64 a4 asm("$a4") = arg5;103 __asm__ volatile("syscall 0\n\t"104 : "+r"(a0)105 : "r"(a7), "r"(a1), "r"(a2), "r"(a3), "r"(a4)106 : INTERNAL_SYSCALL_CLOBBERS);107 return a0;108}109#define __internal_syscall5(n, a1, a2, a3, a4, a5) \110 (__internal_syscall)(n, (u64)(a1), (long)(a2), (long)(a3), (long)(a4), \111 (u64)(a5))112 113static uptr __internal_syscall(u64 nr, u64 arg1, long arg2, long arg3, u64 arg4,114 long arg5, long arg6) {115 register u64 a7 asm("$a7") = nr;116 register u64 a0 asm("$a0") = arg1;117 register u64 a1 asm("$a1") = arg2;118 register u64 a2 asm("$a2") = arg3;119 register u64 a3 asm("$a3") = arg4;120 register u64 a4 asm("$a4") = arg5;121 register u64 a5 asm("$a5") = arg6;122 __asm__ volatile("syscall 0\n\t"123 : "+r"(a0)124 : "r"(a7), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5)125 : INTERNAL_SYSCALL_CLOBBERS);126 return a0;127}128#define __internal_syscall6(n, a1, a2, a3, a4, a5, a6) \129 (__internal_syscall)(n, (u64)(a1), (long)(a2), (long)(a3), (long)(a4), \130 (u64)(a5), (long)(a6))131 132static uptr __internal_syscall(u64 nr, u64 arg1, long arg2, long arg3, u64 arg4,133 long arg5, long arg6, long arg7) {134 register u64 a7 asm("$a7") = nr;135 register u64 a0 asm("$a0") = arg1;136 register u64 a1 asm("$a1") = arg2;137 register u64 a2 asm("$a2") = arg3;138 register u64 a3 asm("$a3") = arg4;139 register u64 a4 asm("$a4") = arg5;140 register u64 a5 asm("$a5") = arg6;141 register u64 a6 asm("$a6") = arg7;142 __asm__ volatile("syscall 0\n\t"143 : "+r"(a0)144 : "r"(a7), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5),145 "r"(a6)146 : INTERNAL_SYSCALL_CLOBBERS);147 return a0;148}149#define __internal_syscall7(n, a1, a2, a3, a4, a5, a6, a7) \150 (__internal_syscall)(n, (u64)(a1), (long)(a2), (long)(a3), (long)(a4), \151 (u64)(a5), (long)(a6), (long)(a7))152 153#define __SYSCALL_NARGS_X(a1, a2, a3, a4, a5, a6, a7, a8, n, ...) n154#define __SYSCALL_NARGS(...) \155 __SYSCALL_NARGS_X(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0, )156#define __SYSCALL_CONCAT_X(a, b) a##b157#define __SYSCALL_CONCAT(a, b) __SYSCALL_CONCAT_X(a, b)158#define __SYSCALL_DISP(b, ...) \159 __SYSCALL_CONCAT(b, __SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__)160 161#define internal_syscall(...) __SYSCALL_DISP(__internal_syscall, __VA_ARGS__)162 163// Helper function used to avoid clobbering of errno.164bool internal_iserror(uptr retval, int *internal_errno) {165 if (retval >= (uptr)-4095) {166 if (internal_errno)167 *internal_errno = -retval;168 return true;169 }170 return false;171}172