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b168057a | 1 | /* Copyright (C) 1992-2015 Free Software Foundation, Inc. |
3846ef75 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>, August 1995. | |
4 | Changed by Kaz Kojima, <kkojima@rr.iij4u.or.jp>. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
3846ef75 UD |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
3846ef75 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
3846ef75 UD |
19 | |
20 | #ifndef _LINUX_SH_SYSDEP_H | |
21 | #define _LINUX_SH_SYSDEP_H 1 | |
22 | ||
23 | /* There is some commonality. */ | |
24 | #include <sysdeps/unix/sh/sysdep.h> | |
d9038ff8 | 25 | #include <tls.h> |
3846ef75 UD |
26 | |
27 | /* For Linux we can use the system call table in the header file | |
28 | /usr/include/asm/unistd.h | |
29 | of the kernel. But these symbols do not follow the SYS_* syntax | |
30 | so we have to redefine the `SYS_ify' macro here. */ | |
31 | #undef SYS_ify | |
32 | #define SYS_ify(syscall_name) (__NR_##syscall_name) | |
33 | ||
34 | ||
35 | #ifdef __ASSEMBLER__ | |
36 | ||
37 | /* Linux uses a negative return value to indicate syscall errors, | |
38 | unlike most Unices, which use the condition codes' carry flag. | |
39 | ||
40 | Since version 2.1 the return value of a system call might be | |
41 | negative even if the call succeeded. E.g., the `lseek' system call | |
42 | might return a large offset. Therefore we must not anymore test | |
43 | for < 0, but test for a real error by making sure the value in R0 | |
44 | is a real error number. Linus said he will make sure the no syscall | |
45 | returns a value in -1 .. -4095 as a valid result so we can savely | |
46 | test with -4095. */ | |
47 | ||
bbd17455 | 48 | #define _IMM1 #-1 |
3846ef75 UD |
49 | #define _IMM12 #-12 |
50 | #undef PSEUDO | |
3846ef75 UD |
51 | #define PSEUDO(name, syscall_name, args) \ |
52 | .text; \ | |
53 | ENTRY (name); \ | |
ffa8d2a0 | 54 | DO_CALL (syscall_name, args); \ |
3846ef75 UD |
55 | mov r0,r1; \ |
56 | mov _IMM12,r2; \ | |
57 | shad r2,r1; \ | |
58 | not r1,r1; \ | |
59 | tst r1,r1; \ | |
bbd17455 UD |
60 | bf .Lpseudo_end; \ |
61 | SYSCALL_ERROR_HANDLER; \ | |
62 | .Lpseudo_end: | |
3846ef75 UD |
63 | |
64 | #undef PSEUDO_END | |
65 | #define PSEUDO_END(name) \ | |
3846ef75 UD |
66 | END (name) |
67 | ||
9eb88290 UD |
68 | #undef PSEUDO_NOERRNO |
69 | #define PSEUDO_NOERRNO(name, syscall_name, args) \ | |
70 | .text; \ | |
71 | ENTRY (name); \ | |
72 | DO_CALL (syscall_name, args) | |
73 | ||
74 | #undef PSEUDO_END_NOERRNO | |
75 | #define PSEUDO_END_NOERRNO(name) \ | |
76 | END (name) | |
77 | ||
78 | #define ret_NOERRNO ret | |
79 | ||
5acf789a UD |
80 | #define PSEUDO_ERRVAL(name, syscall_name, args) \ |
81 | .text; \ | |
82 | ENTRY (name); \ | |
83 | DO_CALL (syscall_name, args); | |
84 | ||
85 | #undef PSEUDO_END_ERRVAL | |
86 | #define PSEUDO_END_ERRVAL(name) \ | |
87 | END (name) | |
88 | ||
89 | #define ret_ERRVAL ret | |
90 | ||
bbd17455 | 91 | #ifndef PIC |
aff4519d UD |
92 | # define SYSCALL_ERROR_HANDLER \ |
93 | mov.l 0f,r1; \ | |
94 | jmp @r1; \ | |
95 | mov r0,r4; \ | |
96 | .align 2; \ | |
97 | 0: .long __syscall_error | |
bbd17455 UD |
98 | #else |
99 | # if RTLD_PRIVATE_ERRNO | |
100 | # define SYSCALL_ERROR_HANDLER \ | |
101 | neg r0,r1; \ | |
58f902b8 TS |
102 | mov r12,r2; \ |
103 | cfi_register (r12, r2); \ | |
bbd17455 UD |
104 | mov.l 0f,r12; \ |
105 | mova 0f,r0; \ | |
106 | add r0,r12; \ | |
107 | mov.l 1f,r0; \ | |
d9038ff8 | 108 | mov.l r1,@(r0,r12); \ |
58f902b8 TS |
109 | mov r2,r12; \ |
110 | cfi_restore (r12); \ | |
bbd17455 UD |
111 | bra .Lpseudo_end; \ |
112 | mov _IMM1,r0; \ | |
113 | .align 2; \ | |
114 | 0: .long _GLOBAL_OFFSET_TABLE_; \ | |
96c82b3f | 115 | 1: .long rtld_errno@GOTOFF |
bbd17455 UD |
116 | |
117 | # elif defined _LIBC_REENTRANT | |
118 | ||
4f41c682 | 119 | # if IS_IN (libc) |
d063d164 UD |
120 | # define SYSCALL_ERROR_ERRNO __libc_errno |
121 | # else | |
122 | # define SYSCALL_ERROR_ERRNO errno | |
123 | # endif | |
124 | # define SYSCALL_ERROR_HANDLER \ | |
bbd17455 UD |
125 | neg r0,r1; \ |
126 | mov r12,r2; \ | |
58f902b8 | 127 | cfi_register (r12, r2); \ |
bbd17455 UD |
128 | mov.l 0f,r12; \ |
129 | mova 0f,r0; \ | |
130 | add r0,r12; \ | |
131 | mov.l 1f,r0; \ | |
132 | stc gbr, r4; \ | |
133 | mov.l @(r0,r12),r0; \ | |
134 | mov r2,r12; \ | |
58f902b8 | 135 | cfi_restore (r12); \ |
bbd17455 UD |
136 | add r4,r0; \ |
137 | mov.l r1,@r0; \ | |
138 | bra .Lpseudo_end; \ | |
139 | mov _IMM1,r0; \ | |
140 | .align 2; \ | |
141 | 0: .long _GLOBAL_OFFSET_TABLE_; \ | |
142 | 1: .long SYSCALL_ERROR_ERRNO@GOTTPOFF | |
bbd17455 UD |
143 | # else |
144 | /* Store (-r0) into errno through the GOT. */ | |
145 | # define SYSCALL_ERROR_HANDLER \ | |
146 | neg r0,r1; \ | |
147 | mov r12,r2; \ | |
58f902b8 | 148 | cfi_register (r12, r2); \ |
bbd17455 UD |
149 | mov.l 0f,r12; \ |
150 | mova 0f,r0; \ | |
151 | add r0,r12; \ | |
152 | mov.l 1f,r0; \ | |
153 | mov.l @(r0,r12),r0; \ | |
154 | mov r2,r12; \ | |
58f902b8 | 155 | cfi_restore (r12); \ |
bbd17455 UD |
156 | mov.l r1,@r0; \ |
157 | bra .Lpseudo_end; \ | |
158 | mov _IMM1,r0; \ | |
159 | .align 2; \ | |
160 | 0: .long _GLOBAL_OFFSET_TABLE_; \ | |
161 | 1: .long errno@GOT | |
162 | # endif /* _LIBC_REENTRANT */ | |
163 | #endif /* PIC */ | |
3846ef75 | 164 | |
1769a73f UD |
165 | # ifdef NEED_SYSCALL_INST_PAD |
166 | # define SYSCALL_INST_PAD \ | |
167 | or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0 | |
168 | # else | |
169 | # define SYSCALL_INST_PAD | |
170 | # endif | |
171 | ||
876f9634 UD |
172 | #define SYSCALL_INST0 trapa #0x10 |
173 | #define SYSCALL_INST1 trapa #0x11 | |
174 | #define SYSCALL_INST2 trapa #0x12 | |
175 | #define SYSCALL_INST3 trapa #0x13 | |
176 | #define SYSCALL_INST4 trapa #0x14 | |
177 | #define SYSCALL_INST5 mov.l @(0,r15),r0; trapa #0x15 | |
178 | #define SYSCALL_INST6 mov.l @(0,r15),r0; mov.l @(4,r15),r1; trapa #0x16 | |
3846ef75 UD |
179 | |
180 | #undef DO_CALL | |
ffa8d2a0 | 181 | #define DO_CALL(syscall_name, args) \ |
876f9634 UD |
182 | mov.l 1f,r3; \ |
183 | SYSCALL_INST##args; \ | |
1769a73f | 184 | SYSCALL_INST_PAD; \ |
876f9634 UD |
185 | bra 2f; \ |
186 | nop; \ | |
187 | .align 2; \ | |
188 | 1: .long SYS_ify (syscall_name); \ | |
3846ef75 UD |
189 | 2: |
190 | ||
191 | #else /* not __ASSEMBLER__ */ | |
192 | ||
876f9634 UD |
193 | #define SYSCALL_INST_STR0 "trapa #0x10\n\t" |
194 | #define SYSCALL_INST_STR1 "trapa #0x11\n\t" | |
195 | #define SYSCALL_INST_STR2 "trapa #0x12\n\t" | |
196 | #define SYSCALL_INST_STR3 "trapa #0x13\n\t" | |
197 | #define SYSCALL_INST_STR4 "trapa #0x14\n\t" | |
198 | #define SYSCALL_INST_STR5 "trapa #0x15\n\t" | |
199 | #define SYSCALL_INST_STR6 "trapa #0x16\n\t" | |
200 | ||
2a051a7d UD |
201 | # ifdef NEED_SYSCALL_INST_PAD |
202 | # define SYSCALL_INST_PAD "\ | |
203 | or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0" | |
204 | # else | |
205 | # define SYSCALL_INST_PAD | |
206 | # endif | |
207 | ||
876f9634 UD |
208 | #define ASMFMT_0 |
209 | #define ASMFMT_1 \ | |
210 | , "r" (r4) | |
211 | #define ASMFMT_2 \ | |
212 | , "r" (r4), "r" (r5) | |
213 | #define ASMFMT_3 \ | |
214 | , "r" (r4), "r" (r5), "r" (r6) | |
215 | #define ASMFMT_4 \ | |
216 | , "r" (r4), "r" (r5), "r" (r6), "r" (r7) | |
217 | #define ASMFMT_5 \ | |
218 | , "r" (r4), "r" (r5), "r" (r6), "r" (r7), "0" (r0) | |
219 | #define ASMFMT_6 \ | |
220 | , "r" (r4), "r" (r5), "r" (r6), "r" (r7), "0" (r0), "r" (r1) | |
221 | #define ASMFMT_7 \ | |
222 | , "r" (r4), "r" (r5), "r" (r6), "r" (r7), "0" (r0), "r" (r1), "r" (r2) | |
223 | ||
224 | #define SUBSTITUTE_ARGS_0() | |
78ce59f0 UD |
225 | #define SUBSTITUTE_ARGS_1(arg1) \ |
226 | long int _arg1 = (long int) (arg1); \ | |
227 | register long int r4 asm ("%r4") = (long int) (_arg1) | |
228 | #define SUBSTITUTE_ARGS_2(arg1, arg2) \ | |
229 | long int _arg1 = (long int) (arg1); \ | |
230 | long int _arg2 = (long int) (arg2); \ | |
231 | register long int r4 asm ("%r4") = (long int) (_arg1); \ | |
232 | register long int r5 asm ("%r5") = (long int) (_arg2) | |
233 | #define SUBSTITUTE_ARGS_3(arg1, arg2, arg3) \ | |
234 | long int _arg1 = (long int) (arg1); \ | |
235 | long int _arg2 = (long int) (arg2); \ | |
236 | long int _arg3 = (long int) (arg3); \ | |
237 | register long int r4 asm ("%r4") = (long int) (_arg1); \ | |
238 | register long int r5 asm ("%r5") = (long int) (_arg2); \ | |
239 | register long int r6 asm ("%r6") = (long int) (_arg3) | |
240 | #define SUBSTITUTE_ARGS_4(arg1, arg2, arg3, arg4) \ | |
241 | long int _arg1 = (long int) (arg1); \ | |
242 | long int _arg2 = (long int) (arg2); \ | |
243 | long int _arg3 = (long int) (arg3); \ | |
244 | long int _arg4 = (long int) (arg4); \ | |
245 | register long int r4 asm ("%r4") = (long int) (_arg1); \ | |
246 | register long int r5 asm ("%r5") = (long int) (_arg2); \ | |
247 | register long int r6 asm ("%r6") = (long int) (_arg3); \ | |
248 | register long int r7 asm ("%r7") = (long int) (_arg4) | |
249 | #define SUBSTITUTE_ARGS_5(arg1, arg2, arg3, arg4, arg5) \ | |
250 | long int _arg1 = (long int) (arg1); \ | |
251 | long int _arg2 = (long int) (arg2); \ | |
252 | long int _arg3 = (long int) (arg3); \ | |
253 | long int _arg4 = (long int) (arg4); \ | |
254 | long int _arg5 = (long int) (arg5); \ | |
255 | register long int r4 asm ("%r4") = (long int) (_arg1); \ | |
256 | register long int r5 asm ("%r5") = (long int) (_arg2); \ | |
257 | register long int r6 asm ("%r6") = (long int) (_arg3); \ | |
258 | register long int r7 asm ("%r7") = (long int) (_arg4); \ | |
259 | register long int r0 asm ("%r0") = (long int) (_arg5) | |
260 | #define SUBSTITUTE_ARGS_6(arg1, arg2, arg3, arg4, arg5, arg6) \ | |
261 | long int _arg1 = (long int) (arg1); \ | |
262 | long int _arg2 = (long int) (arg2); \ | |
263 | long int _arg3 = (long int) (arg3); \ | |
264 | long int _arg4 = (long int) (arg4); \ | |
265 | long int _arg5 = (long int) (arg5); \ | |
266 | long int _arg6 = (long int) (arg6); \ | |
267 | register long int r4 asm ("%r4") = (long int)(_arg1); \ | |
268 | register long int r5 asm ("%r5") = (long int) (_arg2); \ | |
269 | register long int r6 asm ("%r6") = (long int) (_arg3); \ | |
270 | register long int r7 asm ("%r7") = (long int) (_arg4); \ | |
271 | register long int r0 asm ("%r0") = (long int) (_arg5); \ | |
272 | register long int r1 asm ("%r1") = (long int) (_arg6) | |
273 | #define SUBSTITUTE_ARGS_7(arg1, arg2, arg3, arg4, arg5, arg6, arg7) \ | |
274 | long int _arg1 = (long int) (arg1); \ | |
275 | long int _arg2 = (long int) (arg2); \ | |
276 | long int _arg3 = (long int) (arg3); \ | |
277 | long int _arg4 = (long int) (arg4); \ | |
278 | long int _arg5 = (long int) (arg5); \ | |
279 | long int _arg6 = (long int) (arg6); \ | |
280 | long int _arg7 = (long int) (arg7); \ | |
281 | register long int r4 asm ("%r4") = (long int) (_arg1); \ | |
282 | register long int r5 asm ("%r5") = (long int) (_arg2); \ | |
283 | register long int r6 asm ("%r6") = (long int) (_arg3); \ | |
284 | register long int r7 asm ("%r7") = (long int) (_arg4); \ | |
285 | register long int r0 asm ("%r0") = (long int) (_arg5); \ | |
286 | register long int r1 asm ("%r1") = (long int) (_arg6); \ | |
287 | register long int r2 asm ("%r2") = (long int) (_arg7) | |
876f9634 | 288 | |
3846ef75 | 289 | #undef INLINE_SYSCALL |
2a051a7d UD |
290 | #define INLINE_SYSCALL(name, nr, args...) \ |
291 | ({ \ | |
292 | unsigned int resultvar = INTERNAL_SYSCALL (name, , nr, args); \ | |
293 | if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (resultvar, ), 0)) \ | |
294 | { \ | |
d063d164 UD |
295 | __set_errno (INTERNAL_SYSCALL_ERRNO (resultvar, )); \ |
296 | resultvar = 0xffffffff; \ | |
2a051a7d UD |
297 | } \ |
298 | (int) resultvar; }) | |
299 | ||
300 | #undef INTERNAL_SYSCALL | |
301 | #define INTERNAL_SYSCALL(name, err, nr, args...) \ | |
78ce59f0 UD |
302 | ({ \ |
303 | unsigned long int resultvar; \ | |
304 | register long int r3 asm ("%r3") = SYS_ify (name); \ | |
305 | SUBSTITUTE_ARGS_##nr(args); \ | |
306 | \ | |
307 | asm volatile (SYSCALL_INST_STR##nr SYSCALL_INST_PAD \ | |
308 | : "=z" (resultvar) \ | |
309 | : "r" (r3) ASMFMT_##nr \ | |
a7bd183f | 310 | : "memory", "t"); \ |
78ce59f0 | 311 | \ |
876f9634 | 312 | (int) resultvar; }) |
3846ef75 | 313 | |
362038b0 UD |
314 | /* The _NCS variant allows non-constant syscall numbers. */ |
315 | #define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ | |
316 | ({ \ | |
317 | unsigned long int resultvar; \ | |
d063d164 | 318 | register long int r3 asm ("%r3") = (name); \ |
362038b0 UD |
319 | SUBSTITUTE_ARGS_##nr(args); \ |
320 | \ | |
321 | asm volatile (SYSCALL_INST_STR##nr SYSCALL_INST_PAD \ | |
322 | : "=z" (resultvar) \ | |
323 | : "r" (r3) ASMFMT_##nr \ | |
a7bd183f | 324 | : "memory", "t"); \ |
362038b0 UD |
325 | \ |
326 | (int) resultvar; }) | |
327 | ||
2a051a7d UD |
328 | #undef INTERNAL_SYSCALL_DECL |
329 | #define INTERNAL_SYSCALL_DECL(err) do { } while (0) | |
330 | ||
331 | #undef INTERNAL_SYSCALL_ERROR_P | |
332 | #define INTERNAL_SYSCALL_ERROR_P(val, err) \ | |
333 | ((unsigned int) (val) >= 0xfffff001u) | |
334 | ||
335 | #undef INTERNAL_SYSCALL_ERRNO | |
336 | #define INTERNAL_SYSCALL_ERRNO(val, err) (-(val)) | |
337 | ||
3846ef75 UD |
338 | #endif /* __ASSEMBLER__ */ |
339 | ||
d9038ff8 | 340 | /* Pointer mangling support. */ |
a3848485 | 341 | #if IS_IN (rtld) |
d9038ff8 UD |
342 | /* We cannot use the thread descriptor because in ld.so we use setjmp |
343 | earlier than the descriptor is initialized. Using a global variable | |
344 | is too complicated here since we have no PC-relative addressing mode. */ | |
345 | #else | |
346 | # ifdef __ASSEMBLER__ | |
a6df7387 UD |
347 | # define PTR_MANGLE(reg, tmp) \ |
348 | stc gbr,tmp; mov.l @(POINTER_GUARD,tmp),tmp; xor tmp,reg | |
349 | # define PTR_MANGLE2(reg, tmp) xor tmp,reg | |
350 | # define PTR_DEMANGLE(reg, tmp) PTR_MANGLE (reg, tmp) | |
351 | # define PTR_DEMANGLE2(reg, tmp) PTR_MANGLE2 (reg, tmp) | |
d9038ff8 UD |
352 | # else |
353 | # define PTR_MANGLE(var) \ | |
354 | (var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ()) | |
355 | # define PTR_DEMANGLE(var) PTR_MANGLE (var) | |
356 | # endif | |
357 | #endif | |
358 | ||
3846ef75 | 359 | #endif /* linux/sh/sysdep.h */ |