1 /* Assembler macros for Nios II.
2 Copyright (C) 2000-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #ifndef _LINUX_NIOS2_SYSDEP_H
20 #define _LINUX_NIOS2_SYSDEP_H 1
21
22 #include <sysdeps/unix/sysv/linux/sysdep.h>
23 #include <sysdeps/unix/sysdep.h>
24 #include <sysdeps/nios2/sysdep.h>
25
26 /* For RTLD_PRIVATE_ERRNO. */
27 #include <dl-sysdep.h>
28
29 #include <tls.h>
30
31 /* For Linux we can use the system call table in the header file
32 /usr/include/asm/unistd.h
33 of the kernel. But these symbols do not follow the SYS_* syntax
34 so we have to redefine the `SYS_ify' macro here. */
35 #undef SYS_ify
36 #define SYS_ify(syscall_name) __NR_##syscall_name
37
38 #ifdef __ASSEMBLER__
39
40 #undef SYSCALL_ERROR_LABEL
41 #define SYSCALL_ERROR_LABEL __local_syscall_error
42
43 #undef PSEUDO
44 #define PSEUDO(name, syscall_name, args) \
45 ENTRY (name) \
46 DO_CALL (syscall_name, args) \
47 bne r7, zero, SYSCALL_ERROR_LABEL; \
48
49 #undef PSEUDO_END
50 #define PSEUDO_END(name) \
51 SYSCALL_ERROR_HANDLER \
52 END (name)
53
54 #undef PSEUDO_NOERRNO
55 #define PSEUDO_NOERRNO(name, syscall_name, args) \
56 ENTRY (name) \
57 DO_CALL (syscall_name, args)
58
59 #undef PSEUDO_END_NOERRNO
60 #define PSEUDO_END_NOERRNO(name) \
61 END (name)
62
63 #undef ret_NOERRNO
64 #define ret_NOERRNO ret
65
66 #undef DO_CALL
67 #define DO_CALL(syscall_name, args) \
68 DOARGS_##args \
69 movi r2, SYS_ify(syscall_name); \
70 trap;
71
72 #if defined(__PIC__) || defined(PIC)
73
74 # if RTLD_PRIVATE_ERRNO
75
76 # define SYSCALL_ERROR_HANDLER \
77 SYSCALL_ERROR_LABEL: \
78 nextpc r3; \
79 1: \
80 movhi r8, %hiadj(rtld_errno - 1b); \
81 addi r8, r8, %lo(rtld_errno - 1b); \
82 add r3, r3, r8; \
83 stw r2, 0(r3); \
84 movi r2, -1; \
85 ret;
86
87 # else
88
89 # if IS_IN (libc)
90 # define SYSCALL_ERROR_ERRNO __libc_errno
91 # else
92 # define SYSCALL_ERROR_ERRNO errno
93 # endif
94 # define SYSCALL_ERROR_HANDLER \
95 SYSCALL_ERROR_LABEL: \
96 nextpc r3; \
97 1: \
98 movhi r8, %hiadj(_gp_got - 1b); \
99 addi r8, r8, %lo(_gp_got - 1b); \
100 add r3, r3, r8; \
101 ldw r3, %tls_ie(SYSCALL_ERROR_ERRNO)(r3); \
102 add r3, r23, r3; \
103 stw r2, 0(r3); \
104 movi r2, -1; \
105 ret;
106
107 # endif
108
109 #else
110
111 /* We can use a single error handler in the static library. */
112 #define SYSCALL_ERROR_HANDLER \
113 SYSCALL_ERROR_LABEL: \
114 jmpi __syscall_error;
115
116 #endif
117
118 #define DOARGS_0 /* nothing */
119 #define DOARGS_1 /* nothing */
120 #define DOARGS_2 /* nothing */
121 #define DOARGS_3 /* nothing */
122 #define DOARGS_4 /* nothing */
123 #define DOARGS_5 ldw r8, 0(sp);
124 #define DOARGS_6 ldw r9, 4(sp); ldw r8, 0(sp);
125
126 /* The function has to return the error code. */
127 #undef PSEUDO_ERRVAL
128 #define PSEUDO_ERRVAL(name, syscall_name, args) \
129 ENTRY (name) \
130 DO_CALL (syscall_name, args)
131
132 #undef PSEUDO_END_ERRVAL
133 #define PSEUDO_END_ERRVAL(name) \
134 END (name)
135
136 #define ret_ERRVAL ret
137
138 #else /* __ASSEMBLER__ */
139
140 /* In order to get __set_errno() definition in INLINE_SYSCALL. */
141 #include <errno.h>
142
143 #undef INTERNAL_SYSCALL_RAW
144 #define INTERNAL_SYSCALL_RAW(name, nr, args...) \
145 ({ unsigned int _sys_result; \
146 { \
147 /* Load argument values in temporary variables
148 to perform side effects like function calls
149 before the call-used registers are set. */ \
150 LOAD_ARGS_##nr (args) \
151 LOAD_REGS_##nr \
152 register int _r2 asm ("r2") = (int)(name); \
153 register int _err asm ("r7"); \
154 asm volatile ("trap" \
155 : "+r" (_r2), "=r" (_err) \
156 : ASM_ARGS_##nr \
157 : __SYSCALL_CLOBBERS); \
158 _sys_result = _err != 0 ? -_r2 : _r2; \
159 } \
160 (int) _sys_result; })
161
162 #undef INTERNAL_SYSCALL
163 #define INTERNAL_SYSCALL(name, nr, args...) \
164 INTERNAL_SYSCALL_RAW(SYS_ify(name), nr, args)
165
166 #undef INTERNAL_SYSCALL_NCS
167 #define INTERNAL_SYSCALL_NCS(number, nr, args...) \
168 INTERNAL_SYSCALL_RAW(number, nr, args)
169
170 #define LOAD_ARGS_0()
171 #define LOAD_REGS_0
172 #define ASM_ARGS_0
173 #define LOAD_ARGS_1(a1) \
174 LOAD_ARGS_0 () \
175 int __arg1 = (int) (a1);
176 #define LOAD_REGS_1 \
177 register int _r4 asm ("r4") = __arg1; \
178 LOAD_REGS_0
179 #define ASM_ARGS_1 "r" (_r4)
180 #define LOAD_ARGS_2(a1, a2) \
181 LOAD_ARGS_1 (a1) \
182 int __arg2 = (int) (a2);
183 #define LOAD_REGS_2 \
184 register int _r5 asm ("r5") = __arg2; \
185 LOAD_REGS_1
186 #define ASM_ARGS_2 ASM_ARGS_1, "r" (_r5)
187 #define LOAD_ARGS_3(a1, a2, a3) \
188 LOAD_ARGS_2 (a1, a2) \
189 int __arg3 = (int) (a3);
190 #define LOAD_REGS_3 \
191 register int _r6 asm ("r6") = __arg3; \
192 LOAD_REGS_2
193 #define ASM_ARGS_3 ASM_ARGS_2, "r" (_r6)
194 #define LOAD_ARGS_4(a1, a2, a3, a4) \
195 LOAD_ARGS_3 (a1, a2, a3) \
196 int __arg4 = (int) (a4);
197 #define LOAD_REGS_4 \
198 register int _r7 asm ("r7") = __arg4; \
199 LOAD_REGS_3
200 #define ASM_ARGS_4 ASM_ARGS_3, "r" (_r7)
201 #define LOAD_ARGS_5(a1, a2, a3, a4, a5) \
202 LOAD_ARGS_4 (a1, a2, a3, a4) \
203 int __arg5 = (int) (a5);
204 #define LOAD_REGS_5 \
205 register int _r8 asm ("r8") = __arg5; \
206 LOAD_REGS_4
207 #define ASM_ARGS_5 ASM_ARGS_4, "r" (_r8)
208 #define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6) \
209 LOAD_ARGS_5 (a1, a2, a3, a4, a5) \
210 int __arg6 = (int) (a6);
211 #define LOAD_REGS_6 \
212 register int _r9 asm ("r9") = __arg6; \
213 LOAD_REGS_5
214 #define ASM_ARGS_6 ASM_ARGS_5, "r" (_r9)
215
216 #define __SYSCALL_CLOBBERS "memory"
217
218 #undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
219 #define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
220
221 #endif /* __ASSEMBLER__ */
222
223 #endif /* linux/nios2/sysdep.h */