1 /* Assembler macros for 64 bit S/390.
2 Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
3 Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
4 This file is part of the GNU C Library.
6 The GNU C Library is free software; you can redistribute it and/or
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.
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
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 #ifndef _LINUX_S390_SYSDEP_H
22 #define _LINUX_S390_SYSDEP_H
24 #include <sysdeps/s390/s390-64/sysdep.h>
25 #include <sysdeps/unix/sysdep.h>
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 /* In newer 2.1 kernels __NR_syscall is missing so we define it here. */
32 #define __NR_syscall 0
35 * Newer kernel versions redefined __NR_pread and __NR_pwrite to
36 * __NR_pread64 and __NR_pwrite64.
39 # define __NR_pread __NR_pread64
42 # define __NR_pwrite __NR_pwrite64
46 #define SYS_ify(syscall_name) __NR_##syscall_name
50 /* Linux uses a negative return value to indicate syscall errors, unlike
51 most Unices, which use the condition codes' carry flag.
53 Since version 2.1 the return value of a system call might be negative
54 even if the call succeeded. E.g., the `lseek' system call might return
55 a large offset. Therefore we must not anymore test for < 0, but test
56 for a real error by making sure the value in gpr2 is a real error
57 number. Linus said he will make sure the no syscall returns a value
58 in -1 .. -4095 as a valid result so we can savely test with -4095. */
61 #define PSEUDO(name, syscall_name, args) \
64 DO_CALL (syscall_name, args); \
67 jgnl SYSCALL_ERROR_LABEL
70 #define PSEUDO_END(name) \
71 SYSCALL_ERROR_HANDLER; \
75 #define PSEUDO_NOERRNO(name, syscall_name, args) \
78 DO_CALL (syscall_name, args)
80 #undef PSEUDO_END_NOERRNO
81 #define PSEUDO_END_NOERRNO(name) \
82 SYSCALL_ERROR_HANDLER; \
86 #define PSEUDO_ERRVAL(name, syscall_name, args) \
89 DO_CALL (syscall_name, args); \
92 #undef PSEUDO_END_ERRVAL
93 #define PSEUDO_END_ERRVAL(name) \
94 SYSCALL_ERROR_HANDLER; \
98 # define SYSCALL_ERROR_LABEL syscall_error
99 # define SYSCALL_ERROR_HANDLER
101 # if RTLD_PRIVATE_ERRNO
102 # define SYSCALL_ERROR_LABEL 0f
103 # define SYSCALL_ERROR_HANDLER \
109 # elif defined _LIBC_REENTRANT
112 # define SYSCALL_ERROR_ERRNO __libc_errno
114 # define SYSCALL_ERROR_ERRNO errno
116 # define SYSCALL_ERROR_LABEL 0f
117 # define SYSCALL_ERROR_HANDLER \
119 larl %r1,SYSCALL_ERROR_ERRNO@indntpoff; \
128 # define SYSCALL_ERROR_LABEL syscall_error@plt
129 # define SYSCALL_ERROR_HANDLER
132 # define SYSCALL_ERROR_LABEL 0f
133 # define SYSCALL_ERROR_HANDLER \
134 0: larl %r1,_GLOBAL_OFFSET_TABLE_; \
135 lg %r1,errno@GOT(%r1); \
140 # endif /* _LIBC_REENTRANT */
143 /* Linux takes system call arguments in registers:
145 syscall number 1 call-clobbered
146 arg 1 2 call-clobbered
147 arg 2 3 call-clobbered
148 arg 3 4 call-clobbered
149 arg 4 5 call-clobbered
152 (Of course a function with say 3 arguments does not have entries for
154 S390 does not need to do ANY stack operations to get its parameters
158 #define DO_CALL(syscall, args) \
159 .if SYS_ify (syscall) < 256; \
160 svc SYS_ify (syscall); \
162 lghi %r1,SYS_ify (syscall); \
169 #define ret_NOERRNO \
175 #endif /* __ASSEMBLER__ */
177 #undef INLINE_SYSCALL
178 #define INLINE_SYSCALL(name, nr, args...) \
180 long _ret = INTERNAL_SYSCALL (name, , nr, args); \
181 if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_ret, ), 0)) \
183 __set_errno (INTERNAL_SYSCALL_ERRNO (_ret, )); \
188 #undef INTERNAL_SYSCALL_DECL
189 #define INTERNAL_SYSCALL_DECL(err) do { } while (0)
191 #undef INTERNAL_SYSCALL_DIRECT
192 #define INTERNAL_SYSCALL_DIRECT(name, err, nr, args...) \
194 DECLARGS_##nr(args) \
195 register long _ret asm("2"); \
199 : "i" (__NR_##name) ASMFMT_##nr \
203 #undef INTERNAL_SYSCALL_SVC0
204 #define INTERNAL_SYSCALL_SVC0(name, err, nr, args...) \
206 DECLARGS_##nr(args) \
207 register unsigned long _nr asm("1") = (unsigned long)(__NR_##name); \
208 register long _ret asm("2"); \
212 : "d" (_nr) ASMFMT_##nr \
216 #undef INTERNAL_SYSCALL_NCS
217 #define INTERNAL_SYSCALL_NCS(no, err, nr, args...) \
219 DECLARGS_##nr(args) \
220 register unsigned long _nr asm("1") = (unsigned long)(no); \
221 register long _ret asm("2"); \
225 : "d" (_nr) ASMFMT_##nr \
229 #undef INTERNAL_SYSCALL
230 #define INTERNAL_SYSCALL(name, err, nr, args...) \
231 (((__NR_##name) < 256) ? \
232 INTERNAL_SYSCALL_DIRECT(name, err, nr, args) : \
233 INTERNAL_SYSCALL_SVC0(name, err,nr, args))
235 #undef INTERNAL_SYSCALL_ERROR_P
236 #define INTERNAL_SYSCALL_ERROR_P(val, err) \
237 ((unsigned long) (val) >= -4095UL)
239 #undef INTERNAL_SYSCALL_ERRNO
240 #define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
243 #define DECLARGS_1(arg1) \
244 register unsigned long gpr2 asm ("2") = (unsigned long)(arg1);
245 #define DECLARGS_2(arg1, arg2) \
247 register unsigned long gpr3 asm ("3") = (unsigned long)(arg2);
248 #define DECLARGS_3(arg1, arg2, arg3) \
249 DECLARGS_2(arg1, arg2) \
250 register unsigned long gpr4 asm ("4") = (unsigned long)(arg3);
251 #define DECLARGS_4(arg1, arg2, arg3, arg4) \
252 DECLARGS_3(arg1, arg2, arg3) \
253 register unsigned long gpr5 asm ("5") = (unsigned long)(arg4);
254 #define DECLARGS_5(arg1, arg2, arg3, arg4, arg5) \
255 DECLARGS_4(arg1, arg2, arg3, arg4) \
256 register unsigned long gpr6 asm ("6") = (unsigned long)(arg5);
259 #define ASMFMT_1 , "0" (gpr2)
260 #define ASMFMT_2 , "0" (gpr2), "d" (gpr3)
261 #define ASMFMT_3 , "0" (gpr2), "d" (gpr3), "d" (gpr4)
262 #define ASMFMT_4 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5)
263 #define ASMFMT_5 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6)
265 #endif /* _LINUX_S390_SYSDEP_H */