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1/* Assembler macros for Nios II.
2 Copyright (C) 2000-2022 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/sysdep.h>
23#include <sysdeps/nios2/sysdep.h>
24#include <sysdeps/unix/sysv/linux/generic/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; \
791: \
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; \
971: \
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/* Pointer mangling support. */
224#if IS_IN (rtld)
225/* We cannot use the thread descriptor because in ld.so we use setjmp
226 earlier than the descriptor is initialized. */
227#else
228# ifdef __ASSEMBLER__
229# define PTR_MANGLE_GUARD(guard) ldw guard, POINTER_GUARD(r23)
230# define PTR_MANGLE(dst, src, guard) xor dst, src, guard
231# define PTR_DEMANGLE(dst, src, guard) PTR_MANGLE (dst, src, guard)
232# else
233# define PTR_MANGLE(var) \
234 (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
235# define PTR_DEMANGLE(var) PTR_MANGLE (var)
236# endif
237#endif
238
239
240#endif /* linux/nios2/sysdep.h */
241

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source code of glibc/sysdeps/unix/sysv/linux/nios2/sysdep.h