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1 /* Copyright (C) 2000-2018 Free Software Foundation, Inc.
2
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 License as
7 published by the Free Software Foundation; either version 2.1 of the
8 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 <http://www.gnu.org/licenses/>. */
18
19 #ifndef _LINUX_MICROBLAZE_SYSDEP_H
20 #define _LINUX_MICROBLAZE_SYSDEP_H 1
21
22 #include <sysdeps/unix/sysdep.h>
23 #include <sysdeps/unix/sysv/linux/sysdep.h>
24 #include <sysdeps/microblaze/sysdep.h>
25
26 /* Defines RTLD_PRIVATE_ERRNO. */
27 #include <dl-sysdep.h>
28
29 /* In order to get __set_errno() definition in INLINE_SYSCALL. */
30 #ifndef __ASSEMBLER__
31 # include <errno.h>
32 #endif
33
34 /* For Linux we can use the system call table in the header file
35 /usr/include/asm/unistd.h
36 of the kernel. But these symbols do not follow the SYS_* syntax
37 so we have to redefine the `SYS_ify' macro here. */
38 #undef SYS_ify
39 #define SYS_ify(syscall_name) __NR_##syscall_name
40
41 #ifdef __ASSEMBLER__
42
43 /* In microblaze ABI function call arguments are passed in registers
44 r5...r10. The return value is stored in r3 (or r3:r4 regiters pair).
45 Linux syscall uses the same convention with the addition that the
46 syscall number is passed in r12. To enter the kernel "brki r14,8"
47 instruction is used.
48 None of the abovementioned registers are presumed across function call
49 or syscall.
50 */
51 /* Linux uses a negative return value to indicate syscall errors, unlike
52 most Unices, which use the condition codes' carry flag.
53
54 Since version 2.1 the return value of a system call might be negative
55 even if the call succeeded. E.g., the `lseek' system call might return
56 a large offset. Therefore we must not anymore test for < 0, but test
57 for a real error by making sure the value in %d0 is a real error
58 number. Linus said he will make sure the no syscall returns a value
59 in -1 .. -4095 as a valid result so we can savely test with -4095. */
60
61 /* We don't want the label for the error handler to be visible in the symbol
62 table when we define it here. */
63 # ifdef PIC
64 # define SYSCALL_ERROR_LABEL 0f
65 # else
66 # define SYSCALL_ERROR_LABEL __syscall_error
67 # endif
68
69 # undef PSEUDO
70 # define PSEUDO(name, syscall_name, args) \
71 .text; \
72 ENTRY (name) \
73 DO_CALL (syscall_name, args); \
74 addik r12,r0,-4095; \
75 cmpu r12,r12,r3; \
76 bgei r12,SYSCALL_ERROR_LABEL;
77
78 # undef PSEUDO_END
79 # define PSEUDO_END(name) \
80 SYSCALL_ERROR_HANDLER; \
81 END (name)
82
83 # undef PSEUDO_NOERRNO
84 # define PSEUDO_NOERRNO(name, syscall_name, args) \
85 .text; \
86 ENTRY (name) \
87 DO_CALL (syscall_name, args);
88
89 # undef PSEUDO_END_NOERRNO
90 # define PSEUDO_END_NOERRNO(name) \
91 END (name)
92
93 /* The function has to return the error code. */
94 # undef PSEUDO_ERRVAL
95 # define PSEUDO_ERRVAL(name, syscall_name, args) \
96 .text; \
97 ENTRY (name) \
98 DO_CALL (syscall_name, args); \
99
100 # undef PSEUDO_END_ERRVAL
101 # define PSEUDO_END_ERRVAL(name) \
102 END (name)
103
104 # define ret_NOERRNO \
105 rtsd r15,8; addk r0,r0,r0;
106
107 # define ret_ERRVAL \
108 rtsd r15,8; rsubk r3,r3,r0;
109
110 # ifdef PIC
111 # define SYSCALL_ERROR_LABEL_DCL 0
112 # if RTLD_PRIVATE_ERRNO
113 # define SYSCALL_ERROR_HANDLER \
114 SYSCALL_ERROR_LABEL_DCL: \
115 mfs r12,rpc; \
116 addik r12,r12,_GLOBAL_OFFSET_TABLE_+8; \
117 lwi r12,r12,rtld_errno@GOT; \
118 rsubk r3,r3,r0; \
119 swi r3,r12,0; \
120 rtsd r15,8; \
121 addik r3,r0,-1;
122 # else /* !RTLD_PRIVATE_ERRNO. */
123 /* Store (-r3) into errno through the GOT. */
124 # if defined _LIBC_REENTRANT
125 # define SYSCALL_ERROR_HANDLER \
126 SYSCALL_ERROR_LABEL_DCL: \
127 addik r1,r1,-16; \
128 swi r15,r1,0; \
129 swi r20,r1,8; \
130 rsubk r3,r3,r0; \
131 swi r3,r1,12; \
132 mfs r20,rpc; \
133 addik r20,r20,_GLOBAL_OFFSET_TABLE_+8; \
134 brlid r15,__errno_location@PLT; \
135 nop; \
136 lwi r4,r1,12; \
137 swi r4,r3,0; \
138 lwi r20,r1,8; \
139 lwi r15,r1,0; \
140 addik r1,r1,16; \
141 rtsd r15,8; \
142 addik r3,r0,-1;
143 # else /* !_LIBC_REENTRANT. */
144 # define SYSCALL_ERROR_HANDLER \
145 SYSCALL_ERROR_LABEL_DCL: \
146 mfs r12,rpc; \
147 addik r12,r12,_GLOBAL_OFFSET_TABLE_+8; \
148 lwi r12,r12,errno@GOT; \
149 rsubk r3,r3,r0; \
150 swi r3,r12,0; \
151 rtsd r15,8; \
152 addik r3,r0,-1;
153 # endif /* _LIBC_REENTRANT. */
154 # endif /* RTLD_PRIVATE_ERRNO. */
155 # else
156 # define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */
157 # endif /* PIC. */
158
159 # define DO_CALL(syscall_name, args) \
160 addik r12,r0,SYS_ify (syscall_name); \
161 brki r14,8; \
162 addk r0,r0,r0;
163
164 #else /* not __ASSEMBLER__ */
165
166 /* Define a macro which expands into the inline wrapper code for a system
167 call. */
168 # undef INLINE_SYSCALL
169 # define INLINE_SYSCALL(name, nr, args...) \
170 ({ INTERNAL_SYSCALL_DECL(err); \
171 unsigned long resultvar = INTERNAL_SYSCALL(name, err, nr, args); \
172 if (INTERNAL_SYSCALL_ERROR_P (resultvar, err)) \
173 { \
174 __set_errno (INTERNAL_SYSCALL_ERRNO (resultvar, err)); \
175 resultvar = (unsigned long) -1; \
176 } \
177 (long) resultvar; \
178 })
179
180 # undef INTERNAL_SYSCALL_DECL
181 # define INTERNAL_SYSCALL_DECL(err) do { } while (0)
182
183 /* Define a macro which expands inline into the wrapper code for a system
184 call. This use is for internal calls that do not need to handle errors
185 normally. It will never touch errno. This returns just what the kernel
186 gave back. */
187 # undef INTERNAL_SYSCALL
188 # define INTERNAL_SYSCALL(name, err, nr, args...) \
189 inline_syscall##nr(SYS_ify(name), args)
190
191 # undef INTERNAL_SYSCALL_NCS
192 # define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
193 inline_syscall##nr(name, args)
194
195 # undef INTERNAL_SYSCALL_ERROR_P
196 # define INTERNAL_SYSCALL_ERROR_P(val, err) \
197 ((unsigned int) (val) >= -4095U)
198
199 # undef INTERNAL_SYSCALL_ERRNO
200 # define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
201
202 # define SYSCALL_CLOBBERS_6 "r11", "r4", "memory"
203 # define SYSCALL_CLOBBERS_5 "r10", SYSCALL_CLOBBERS_6
204 # define SYSCALL_CLOBBERS_4 "r9", SYSCALL_CLOBBERS_5
205 # define SYSCALL_CLOBBERS_3 "r8", SYSCALL_CLOBBERS_4
206 # define SYSCALL_CLOBBERS_2 "r7", SYSCALL_CLOBBERS_3
207 # define SYSCALL_CLOBBERS_1 "r6", SYSCALL_CLOBBERS_2
208 # define SYSCALL_CLOBBERS_0 "r5", SYSCALL_CLOBBERS_1
209
210 # define inline_syscall0(name,dummy) \
211 ({ \
212 register long __ret __asm__("r3"); \
213 register long __r12 __asm__("r12") = name; \
214 __asm__ __volatile__( "brki r14,8; nop;" \
215 : "=r"(__ret) \
216 : "r"(__r12) \
217 : SYSCALL_CLOBBERS_0 ); __ret; \
218 })
219
220 # define inline_syscall1(name,arg1) \
221 ({ \
222 register long __ret __asm__("r3"); \
223 register long __r12 __asm__("r12") = name; \
224 register long __r5 __asm__("r5") = (long)(arg1); \
225 __asm__ __volatile__( "brki r14,8; nop;" \
226 : "=r"(__ret) \
227 : "r"(__r5), "r"(__r12) \
228 : SYSCALL_CLOBBERS_1 ); __ret; \
229 })
230
231 # define inline_syscall2(name,arg1,arg2) \
232 ({ \
233 register long __ret __asm__("r3"); \
234 register long __r12 __asm__("r12") = name; \
235 register long __r5 __asm__("r5") = (long)(arg1); \
236 register long __r6 __asm__("r6") = (long)(arg2); \
237 __asm__ __volatile__( "brki r14,8; nop;" \
238 : "=r"(__ret) \
239 : "r"(__r5), "r"(__r6), "r"(__r12) \
240 : SYSCALL_CLOBBERS_2 ); __ret; \
241 })
242
243
244 # define inline_syscall3(name,arg1,arg2,arg3) \
245 ({ \
246 register long __ret __asm__("r3"); \
247 register long __r12 __asm__("r12") = name; \
248 register long __r5 __asm__("r5") = (long)(arg1); \
249 register long __r6 __asm__("r6") = (long)(arg2); \
250 register long __r7 __asm__("r7") = (long)(arg3); \
251 __asm__ __volatile__( "brki r14,8; nop;" \
252 : "=r"(__ret) \
253 : "r"(__r5), "r"(__r6), "r"(__r7), "r"(__r12) \
254 : SYSCALL_CLOBBERS_3 ); __ret; \
255 })
256
257
258 # define inline_syscall4(name,arg1,arg2,arg3,arg4) \
259 ({ \
260 register long __ret __asm__("r3"); \
261 register long __r12 __asm__("r12") = name; \
262 register long __r5 __asm__("r5") = (long)(arg1); \
263 register long __r6 __asm__("r6") = (long)(arg2); \
264 register long __r7 __asm__("r7") = (long)(arg3); \
265 register long __r8 __asm__("r8") = (long)(arg4); \
266 __asm__ __volatile__( "brki r14,8; nop;" \
267 : "=r"(__ret) \
268 : "r"(__r5), "r"(__r6), "r"(__r7), "r"(__r8),"r"(__r12) \
269 : SYSCALL_CLOBBERS_4 ); __ret; \
270 })
271
272
273 # define inline_syscall5(name,arg1,arg2,arg3,arg4,arg5) \
274 ({ \
275 register long __ret __asm__("r3"); \
276 register long __r12 __asm__("r12") = name; \
277 register long __r5 __asm__("r5") = (long)(arg1); \
278 register long __r6 __asm__("r6") = (long)(arg2); \
279 register long __r7 __asm__("r7") = (long)(arg3); \
280 register long __r8 __asm__("r8") = (long)(arg4); \
281 register long __r9 __asm__("r9") = (long)(arg5); \
282 __asm__ __volatile__( "brki r14,8; nop;" \
283 : "=r"(__ret) \
284 : "r"(__r5), "r"(__r6), "r"(__r7), "r"(__r8),"r"(__r9), "r"(__r12) \
285 : SYSCALL_CLOBBERS_5 ); __ret; \
286 })
287
288
289 # define inline_syscall6(name,arg1,arg2,arg3,arg4,arg5,arg6) \
290 ({ \
291 register long __ret __asm__("r3"); \
292 register long __r12 __asm__("r12") = name; \
293 register long __r5 __asm__("r5") = (long)(arg1); \
294 register long __r6 __asm__("r6") = (long)(arg2); \
295 register long __r7 __asm__("r7") = (long)(arg3); \
296 register long __r8 __asm__("r8") = (long)(arg4); \
297 register long __r9 __asm__("r9") = (long)(arg5); \
298 register long __r10 __asm__("r10") = (long)(arg6); \
299 __asm__ __volatile__( "brki r14,8; nop;" \
300 : "=r"(__ret) \
301 : "r"(__r5), "r"(__r6), "r"(__r7), "r"(__r8),"r"(__r9), "r"(__r10), \
302 "r"(__r12) \
303 : SYSCALL_CLOBBERS_6 ); __ret; \
304 })
305
306
307 /* Pointer mangling is not yet supported for Microblaze. */
308 # define PTR_MANGLE(var) (void) (var)
309 # define PTR_DEMANGLE(var) (void) (var)
310
311 # define SINGLE_THREAD_BY_GLOBAL 1
312
313 #endif /* not __ASSEMBLER__ */
314
315 #endif /* _LINUX_MICROBLAZE_SYSDEP_H */
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