Warning: This file is not a C or C++ file. It does not have highlighting.
1 | /* SPDX-License-Identifier: LGPL-2.1 OR MIT */ |
---|---|
2 | /* |
3 | * LoongArch specific definitions for NOLIBC |
4 | * Copyright (C) 2023 Loongson Technology Corporation Limited |
5 | */ |
6 | |
7 | #ifndef _NOLIBC_ARCH_LOONGARCH_H |
8 | #define _NOLIBC_ARCH_LOONGARCH_H |
9 | |
10 | #include "compiler.h" |
11 | #include "crt.h" |
12 | |
13 | /* Syscalls for LoongArch : |
14 | * - stack is 16-byte aligned |
15 | * - syscall number is passed in a7 |
16 | * - arguments are in a0, a1, a2, a3, a4, a5 |
17 | * - the system call is performed by calling "syscall 0" |
18 | * - syscall return comes in a0 |
19 | * - the arguments are cast to long and assigned into the target |
20 | * registers which are then simply passed as registers to the asm code, |
21 | * so that we don't have to experience issues with register constraints. |
22 | */ |
23 | |
24 | #define _NOLIBC_SYSCALL_CLOBBERLIST \ |
25 | "memory", "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7", "$t8" |
26 | |
27 | #define my_syscall0(num) \ |
28 | ({ \ |
29 | register long _num __asm__ ("a7") = (num); \ |
30 | register long _arg1 __asm__ ("a0"); \ |
31 | \ |
32 | __asm__ volatile ( \ |
33 | "syscall 0\n" \ |
34 | : "=r"(_arg1) \ |
35 | : "r"(_num) \ |
36 | : _NOLIBC_SYSCALL_CLOBBERLIST \ |
37 | ); \ |
38 | _arg1; \ |
39 | }) |
40 | |
41 | #define my_syscall1(num, arg1) \ |
42 | ({ \ |
43 | register long _num __asm__ ("a7") = (num); \ |
44 | register long _arg1 __asm__ ("a0") = (long)(arg1); \ |
45 | \ |
46 | __asm__ volatile ( \ |
47 | "syscall 0\n" \ |
48 | : "+r"(_arg1) \ |
49 | : "r"(_num) \ |
50 | : _NOLIBC_SYSCALL_CLOBBERLIST \ |
51 | ); \ |
52 | _arg1; \ |
53 | }) |
54 | |
55 | #define my_syscall2(num, arg1, arg2) \ |
56 | ({ \ |
57 | register long _num __asm__ ("a7") = (num); \ |
58 | register long _arg1 __asm__ ("a0") = (long)(arg1); \ |
59 | register long _arg2 __asm__ ("a1") = (long)(arg2); \ |
60 | \ |
61 | __asm__ volatile ( \ |
62 | "syscall 0\n" \ |
63 | : "+r"(_arg1) \ |
64 | : "r"(_arg2), \ |
65 | "r"(_num) \ |
66 | : _NOLIBC_SYSCALL_CLOBBERLIST \ |
67 | ); \ |
68 | _arg1; \ |
69 | }) |
70 | |
71 | #define my_syscall3(num, arg1, arg2, arg3) \ |
72 | ({ \ |
73 | register long _num __asm__ ("a7") = (num); \ |
74 | register long _arg1 __asm__ ("a0") = (long)(arg1); \ |
75 | register long _arg2 __asm__ ("a1") = (long)(arg2); \ |
76 | register long _arg3 __asm__ ("a2") = (long)(arg3); \ |
77 | \ |
78 | __asm__ volatile ( \ |
79 | "syscall 0\n" \ |
80 | : "+r"(_arg1) \ |
81 | : "r"(_arg2), "r"(_arg3), \ |
82 | "r"(_num) \ |
83 | : _NOLIBC_SYSCALL_CLOBBERLIST \ |
84 | ); \ |
85 | _arg1; \ |
86 | }) |
87 | |
88 | #define my_syscall4(num, arg1, arg2, arg3, arg4) \ |
89 | ({ \ |
90 | register long _num __asm__ ("a7") = (num); \ |
91 | register long _arg1 __asm__ ("a0") = (long)(arg1); \ |
92 | register long _arg2 __asm__ ("a1") = (long)(arg2); \ |
93 | register long _arg3 __asm__ ("a2") = (long)(arg3); \ |
94 | register long _arg4 __asm__ ("a3") = (long)(arg4); \ |
95 | \ |
96 | __asm__ volatile ( \ |
97 | "syscall 0\n" \ |
98 | : "+r"(_arg1) \ |
99 | : "r"(_arg2), "r"(_arg3), "r"(_arg4), \ |
100 | "r"(_num) \ |
101 | : _NOLIBC_SYSCALL_CLOBBERLIST \ |
102 | ); \ |
103 | _arg1; \ |
104 | }) |
105 | |
106 | #define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \ |
107 | ({ \ |
108 | register long _num __asm__ ("a7") = (num); \ |
109 | register long _arg1 __asm__ ("a0") = (long)(arg1); \ |
110 | register long _arg2 __asm__ ("a1") = (long)(arg2); \ |
111 | register long _arg3 __asm__ ("a2") = (long)(arg3); \ |
112 | register long _arg4 __asm__ ("a3") = (long)(arg4); \ |
113 | register long _arg5 __asm__ ("a4") = (long)(arg5); \ |
114 | \ |
115 | __asm__ volatile ( \ |
116 | "syscall 0\n" \ |
117 | : "+r"(_arg1) \ |
118 | : "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \ |
119 | "r"(_num) \ |
120 | : _NOLIBC_SYSCALL_CLOBBERLIST \ |
121 | ); \ |
122 | _arg1; \ |
123 | }) |
124 | |
125 | #define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \ |
126 | ({ \ |
127 | register long _num __asm__ ("a7") = (num); \ |
128 | register long _arg1 __asm__ ("a0") = (long)(arg1); \ |
129 | register long _arg2 __asm__ ("a1") = (long)(arg2); \ |
130 | register long _arg3 __asm__ ("a2") = (long)(arg3); \ |
131 | register long _arg4 __asm__ ("a3") = (long)(arg4); \ |
132 | register long _arg5 __asm__ ("a4") = (long)(arg5); \ |
133 | register long _arg6 __asm__ ("a5") = (long)(arg6); \ |
134 | \ |
135 | __asm__ volatile ( \ |
136 | "syscall 0\n" \ |
137 | : "+r"(_arg1) \ |
138 | : "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), "r"(_arg6), \ |
139 | "r"(_num) \ |
140 | : _NOLIBC_SYSCALL_CLOBBERLIST \ |
141 | ); \ |
142 | _arg1; \ |
143 | }) |
144 | |
145 | #if __loongarch_grlen == 32 |
146 | #define LONG_BSTRINS "bstrins.w" |
147 | #else /* __loongarch_grlen == 64 */ |
148 | #define LONG_BSTRINS "bstrins.d" |
149 | #endif |
150 | |
151 | /* startup code */ |
152 | void __attribute__((weak, noreturn, optimize("Os", "omit-frame-pointer"))) __no_stack_protector _start(void) |
153 | { |
154 | __asm__ volatile ( |
155 | "move $a0, $sp\n" /* save stack pointer to $a0, as arg1 of _start_c */ |
156 | LONG_BSTRINS " $sp, $zero, 3, 0\n" /* $sp must be 16-byte aligned */ |
157 | "bl _start_c\n" /* transfer to c runtime */ |
158 | ); |
159 | __builtin_unreachable(); |
160 | } |
161 | |
162 | #endif /* _NOLIBC_ARCH_LOONGARCH_H */ |
163 |
Warning: This file is not a C or C++ file. It does not have highlighting.