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2.9
[glibc/nacl-glibc.git] / sysdeps / unix / sysv / linux / s390 / s390-64 / sysdep.h
blob9ddec8e04179783928ad6526844ecd2452f816d2
1 /* Assembler macros for 64 bit S/390.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
3 Free Software Foundation, Inc.
4 Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
5 This file is part of the GNU C Library.
6
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
11
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
16
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, write to the Free
19 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 02111-1307 USA. */
21
22 #ifndef _LINUX_S390_SYSDEP_H
23 #define _LINUX_S390_SYSDEP_H
24
25 #include <sysdeps/s390/s390-64/sysdep.h>
26 #include <sysdeps/unix/sysdep.h>
27 #include <dl-sysdep.h> /* For RTLD_PRIVATE_ERRNO. */
28 #include <tls.h>
29
30 /* For Linux we can use the system call table in the header file
31 /usr/include/asm/unistd.h
32 of the kernel. But these symbols do not follow the SYS_* syntax
33 so we have to redefine the `SYS_ify' macro here. */
34 /* In newer 2.1 kernels __NR_syscall is missing so we define it here. */
35 #define __NR_syscall 0
36
37 /*
38 * Newer kernel versions redefined __NR_pread and __NR_pwrite to
39 * __NR_pread64 and __NR_pwrite64.
40 */
41 #ifndef __NR_pread
42 # define __NR_pread __NR_pread64
43 #endif
44 #ifndef __NR_pwrite
45 # define __NR_pwrite __NR_pwrite64
46 #endif
47
48 #undef SYS_ify
49 #define SYS_ify(syscall_name) __NR_##syscall_name
50
51 #ifdef __ASSEMBLER__
52
53 /* Linux uses a negative return value to indicate syscall errors, unlike
54 most Unices, which use the condition codes' carry flag.
55
56 Since version 2.1 the return value of a system call might be negative
57 even if the call succeeded. E.g., the `lseek' system call might return
58 a large offset. Therefore we must not anymore test for < 0, but test
59 for a real error by making sure the value in gpr2 is a real error
60 number. Linus said he will make sure the no syscall returns a value
61 in -1 .. -4095 as a valid result so we can savely test with -4095. */
62
63 #undef PSEUDO
64 #define PSEUDO(name, syscall_name, args) \
65 .text; \
66 ENTRY (name) \
67 DO_CALL (syscall_name, args); \
68 lghi %r4,-4095 ; \
69 clgr %r2,%r4 ; \
70 jgnl SYSCALL_ERROR_LABEL
71
72 #undef PSEUDO_END
73 #define PSEUDO_END(name) \
74 SYSCALL_ERROR_HANDLER; \
75 END (name)
76
77 #undef PSEUDO_NOERRNO
78 #define PSEUDO_NOERRNO(name, syscall_name, args) \
79 .text; \
80 ENTRY (name) \
81 DO_CALL (syscall_name, args)
82
83 #undef PSEUDO_END_NOERRNO
84 #define PSEUDO_END_NOERRNO(name) \
85 SYSCALL_ERROR_HANDLER; \
86 END (name)
87
88 #undef PSEUDO_ERRVAL
89 #define PSEUDO_ERRVAL(name, syscall_name, args) \
90 .text; \
91 ENTRY (name) \
92 DO_CALL (syscall_name, args); \
93 lcgr %r2,%r2
94
95 #undef PSEUDO_END_ERRVAL
96 #define PSEUDO_END_ERRVAL(name) \
97 SYSCALL_ERROR_HANDLER; \
98 END (name)
99
100 #ifndef PIC
101 # define SYSCALL_ERROR_LABEL syscall_error
102 # define SYSCALL_ERROR_HANDLER
103 #else
104 # if RTLD_PRIVATE_ERRNO
105 # define SYSCALL_ERROR_LABEL 0f
106 # define SYSCALL_ERROR_HANDLER \
107 0: larl %r1,rtld_errno; \
108 lcr %r2,%r2; \
109 st %r2,0(%r1); \
110 lghi %r2,-1; \
111 br %r14
112 # elif defined _LIBC_REENTRANT
113 # if USE___THREAD
114 # ifndef NOT_IN_libc
115 # define SYSCALL_ERROR_ERRNO __libc_errno
116 # else
117 # define SYSCALL_ERROR_ERRNO errno
118 # endif
119 # define SYSCALL_ERROR_LABEL 0f
120 # define SYSCALL_ERROR_HANDLER \
121 0: lcr %r0,%r2; \
122 larl %r1,SYSCALL_ERROR_ERRNO@indntpoff; \
123 lg %r1,0(%r1); \
124 ear %r2,%a0; \
125 sllg %r2,%r2,32; \
126 ear %r2,%a1; \
127 st %r0,0(%r1,%r2); \
128 lghi %r2,-1; \
129 br %r14
130 # else
131 # define SYSCALL_ERROR_LABEL syscall_error@plt
132 # define SYSCALL_ERROR_HANDLER
133 # endif
134 # else
135 # define SYSCALL_ERROR_LABEL 0f
136 # define SYSCALL_ERROR_HANDLER \
137 0: larl %r1,_GLOBAL_OFFSET_TABLE_; \
138 lg %r1,errno@GOT(%r1); \
139 lcr %r2,%r2; \
140 st %r2,0(%r1); \
141 lghi %r2,-1; \
142 br %r14
143 # endif /* _LIBC_REENTRANT */
144 #endif /* PIC */
145
146 /* Linux takes system call arguments in registers:
147
148 syscall number 1 call-clobbered
149 arg 1 2 call-clobbered
150 arg 2 3 call-clobbered
151 arg 3 4 call-clobbered
152 arg 4 5 call-clobbered
153 arg 5 6 call-saved
154 arg 6 7 call-saved
155
156 (Of course a function with say 3 arguments does not have entries for
157 arguments 4 and 5.)
158 For system calls with 6 parameters a stack operation is required
159 to load the 6th parameter to register 7. Call saved register 7 is
160 moved to register 0 and back to avoid an additional stack frame.
161 */
162
163 #define DO_CALL(syscall, args) \
164 .if args > 5; \
165 lgr %r0,%r7; \
166 lg %r7,160(%r15); \
167 .endif; \
168 .if SYS_ify (syscall) < 256; \
169 svc SYS_ify (syscall); \
170 .else; \
171 lghi %r1,SYS_ify (syscall); \
172 svc 0; \
173 .endif; \
174 .if args > 5; \
175 lgr %r7,%r0; \
176 .endif
177
178 #define ret \
179 br 14
180
181 #define ret_NOERRNO \
182 br 14
183
184 #define ret_ERRVAL \
185 br 14
186
187 #endif /* __ASSEMBLER__ */
188
189 #undef INLINE_SYSCALL
190 #define INLINE_SYSCALL(name, nr, args...) \
191 ({ \
192 long _ret = INTERNAL_SYSCALL (name, , nr, args); \
193 if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_ret, ), 0)) \
194 { \
195 __set_errno (INTERNAL_SYSCALL_ERRNO (_ret, )); \
196 _ret = -1; \
197 } \
198 _ret; })
199
200 #undef INTERNAL_SYSCALL_DECL
201 #define INTERNAL_SYSCALL_DECL(err) do { } while (0)
202
203 #undef INTERNAL_SYSCALL_DIRECT
204 #define INTERNAL_SYSCALL_DIRECT(name, err, nr, args...) \
205 ({ \
206 DECLARGS_##nr(args) \
207 register long _ret asm("2"); \
208 asm volatile ( \
209 "svc %b1\n\t" \
210 : "=d" (_ret) \
211 : "i" (__NR_##name) ASMFMT_##nr \
212 : "memory" ); \
213 _ret; })
214
215 #undef INTERNAL_SYSCALL_SVC0
216 #define INTERNAL_SYSCALL_SVC0(name, err, nr, args...) \
217 ({ \
218 DECLARGS_##nr(args) \
219 register unsigned long _nr asm("1") = (unsigned long)(__NR_##name); \
220 register long _ret asm("2"); \
221 asm volatile ( \
222 "svc 0\n\t" \
223 : "=d" (_ret) \
224 : "d" (_nr) ASMFMT_##nr \
225 : "memory" ); \
226 _ret; })
227
228 #undef INTERNAL_SYSCALL_NCS
229 #define INTERNAL_SYSCALL_NCS(no, err, nr, args...) \
230 ({ \
231 DECLARGS_##nr(args) \
232 register unsigned long _nr asm("1") = (unsigned long)(no); \
233 register long _ret asm("2"); \
234 asm volatile ( \
235 "svc 0\n\t" \
236 : "=d" (_ret) \
237 : "d" (_nr) ASMFMT_##nr \
238 : "memory" ); \
239 _ret; })
240
241 #undef INTERNAL_SYSCALL
242 #define INTERNAL_SYSCALL(name, err, nr, args...) \
243 (((__NR_##name) < 256) ? \
244 INTERNAL_SYSCALL_DIRECT(name, err, nr, args) : \
245 INTERNAL_SYSCALL_SVC0(name, err,nr, args))
246
247 #undef INTERNAL_SYSCALL_ERROR_P
248 #define INTERNAL_SYSCALL_ERROR_P(val, err) \
249 ((unsigned long) (val) >= -4095UL)
250
251 #undef INTERNAL_SYSCALL_ERRNO
252 #define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
253
254 #define DECLARGS_0()
255 #define DECLARGS_1(arg1) \
256 register unsigned long gpr2 asm ("2") = (unsigned long)(arg1);
257 #define DECLARGS_2(arg1, arg2) \
258 DECLARGS_1(arg1) \
259 register unsigned long gpr3 asm ("3") = (unsigned long)(arg2);
260 #define DECLARGS_3(arg1, arg2, arg3) \
261 DECLARGS_2(arg1, arg2) \
262 register unsigned long gpr4 asm ("4") = (unsigned long)(arg3);
263 #define DECLARGS_4(arg1, arg2, arg3, arg4) \
264 DECLARGS_3(arg1, arg2, arg3) \
265 register unsigned long gpr5 asm ("5") = (unsigned long)(arg4);
266 #define DECLARGS_5(arg1, arg2, arg3, arg4, arg5) \
267 DECLARGS_4(arg1, arg2, arg3, arg4) \
268 register unsigned long gpr6 asm ("6") = (unsigned long)(arg5);
269 #define DECLARGS_6(arg1, arg2, arg3, arg4, arg5, arg6) \
270 DECLARGS_5(arg1, arg2, arg3, arg4, arg5) \
271 register unsigned long gpr7 asm ("7") = (unsigned long)(arg6);
272
273 #define ASMFMT_0
274 #define ASMFMT_1 , "0" (gpr2)
275 #define ASMFMT_2 , "0" (gpr2), "d" (gpr3)
276 #define ASMFMT_3 , "0" (gpr2), "d" (gpr3), "d" (gpr4)
277 #define ASMFMT_4 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5)
278 #define ASMFMT_5 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6)
279 #define ASMFMT_6 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6), "d" (gpr7)
280
281 /* Pointer mangling support. */
282 #if defined NOT_IN_libc && defined IS_IN_rtld
283 /* We cannot use the thread descriptor because in ld.so we use setjmp
284 earlier than the descriptor is initialized. */
285 #else
286 /* For the time being just use stack_guard rather than a separate
287 pointer_guard. */
288 # ifdef __ASSEMBLER__
289 # define PTR_MANGLE(reg, tmpreg) \
290 ear tmpreg,%a0; \
291 sllg tmpreg,tmpreg,32; \
292 ear tmpreg,%a1; \
293 xg reg,STACK_GUARD(tmpreg)
294 # define PTR_MANGLE2(reg, tmpreg) \
295 xg reg,STACK_GUARD(tmpreg)
296 # define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
297 # else
298 # define PTR_MANGLE(var) \
299 (var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
300 # define PTR_DEMANGLE(var) PTR_MANGLE (var)
301 # endif
302 #endif
303
304 #endif /* _LINUX_S390_SYSDEP_H */
Port of glibc to Google Native Client (NaCl)