burying unused conditionals
[linux-3.10.git] / arch / parisc / include / asm / unistd.h
1 #ifndef _ASM_PARISC_UNISTD_H_
2 #define _ASM_PARISC_UNISTD_H_
3
4 #include <uapi/asm/unistd.h>
5
6 #ifndef __ASSEMBLY__
7
8 #define SYS_ify(syscall_name)   __NR_##syscall_name
9
10 #ifndef ASM_LINE_SEP
11 # define ASM_LINE_SEP ;
12 #endif
13
14 /* Definition taken from glibc 2.3.3
15  * sysdeps/unix/sysv/linux/hppa/sysdep.h
16  */
17
18 #ifdef PIC
19 /* WARNING: CANNOT BE USED IN A NOP! */
20 # define K_STW_ASM_PIC  "       copy %%r19, %%r4\n"
21 # define K_LDW_ASM_PIC  "       copy %%r4, %%r19\n"
22 # define K_USING_GR4    "%r4",
23 #else
24 # define K_STW_ASM_PIC  " \n"
25 # define K_LDW_ASM_PIC  " \n"
26 # define K_USING_GR4
27 #endif
28
29 /* GCC has to be warned that a syscall may clobber all the ABI
30    registers listed as "caller-saves", see page 8, Table 2
31    in section 2.2.6 of the PA-RISC RUN-TIME architecture
32    document. However! r28 is the result and will conflict with
33    the clobber list so it is left out. Also the input arguments
34    registers r20 -> r26 will conflict with the list so they
35    are treated specially. Although r19 is clobbered by the syscall
36    we cannot say this because it would violate ABI, thus we say
37    r4 is clobbered and use that register to save/restore r19
38    across the syscall. */
39
40 #define K_CALL_CLOB_REGS "%r1", "%r2", K_USING_GR4 \
41                          "%r20", "%r29", "%r31"
42
43 #undef K_INLINE_SYSCALL
44 #define K_INLINE_SYSCALL(name, nr, args...)     ({                      \
45         long __sys_res;                                                 \
46         {                                                               \
47                 register unsigned long __res __asm__("r28");            \
48                 K_LOAD_ARGS_##nr(args)                                  \
49                 /* FIXME: HACK stw/ldw r19 around syscall */            \
50                 __asm__ volatile(                                       \
51                         K_STW_ASM_PIC                                   \
52                         "       ble  0x100(%%sr2, %%r0)\n"              \
53                         "       ldi %1, %%r20\n"                        \
54                         K_LDW_ASM_PIC                                   \
55                         : "=r" (__res)                                  \
56                         : "i" (SYS_ify(name)) K_ASM_ARGS_##nr           \
57                         : "memory", K_CALL_CLOB_REGS K_CLOB_ARGS_##nr   \
58                 );                                                      \
59                 __sys_res = (long)__res;                                \
60         }                                                               \
61         if ( (unsigned long)__sys_res >= (unsigned long)-4095 ){        \
62                 errno = -__sys_res;                                     \
63                 __sys_res = -1;                                         \
64         }                                                               \
65         __sys_res;                                                      \
66 })
67
68 #define K_LOAD_ARGS_0()
69 #define K_LOAD_ARGS_1(r26)                                      \
70         register unsigned long __r26 __asm__("r26") = (unsigned long)(r26);   \
71         K_LOAD_ARGS_0()
72 #define K_LOAD_ARGS_2(r26,r25)                                  \
73         register unsigned long __r25 __asm__("r25") = (unsigned long)(r25);   \
74         K_LOAD_ARGS_1(r26)
75 #define K_LOAD_ARGS_3(r26,r25,r24)                              \
76         register unsigned long __r24 __asm__("r24") = (unsigned long)(r24);   \
77         K_LOAD_ARGS_2(r26,r25)
78 #define K_LOAD_ARGS_4(r26,r25,r24,r23)                          \
79         register unsigned long __r23 __asm__("r23") = (unsigned long)(r23);   \
80         K_LOAD_ARGS_3(r26,r25,r24)
81 #define K_LOAD_ARGS_5(r26,r25,r24,r23,r22)                      \
82         register unsigned long __r22 __asm__("r22") = (unsigned long)(r22);   \
83         K_LOAD_ARGS_4(r26,r25,r24,r23)
84 #define K_LOAD_ARGS_6(r26,r25,r24,r23,r22,r21)                  \
85         register unsigned long __r21 __asm__("r21") = (unsigned long)(r21);   \
86         K_LOAD_ARGS_5(r26,r25,r24,r23,r22)
87
88 /* Even with zero args we use r20 for the syscall number */
89 #define K_ASM_ARGS_0
90 #define K_ASM_ARGS_1 K_ASM_ARGS_0, "r" (__r26)
91 #define K_ASM_ARGS_2 K_ASM_ARGS_1, "r" (__r25)
92 #define K_ASM_ARGS_3 K_ASM_ARGS_2, "r" (__r24)
93 #define K_ASM_ARGS_4 K_ASM_ARGS_3, "r" (__r23)
94 #define K_ASM_ARGS_5 K_ASM_ARGS_4, "r" (__r22)
95 #define K_ASM_ARGS_6 K_ASM_ARGS_5, "r" (__r21)
96
97 /* The registers not listed as inputs but clobbered */
98 #define K_CLOB_ARGS_6
99 #define K_CLOB_ARGS_5 K_CLOB_ARGS_6, "%r21"
100 #define K_CLOB_ARGS_4 K_CLOB_ARGS_5, "%r22"
101 #define K_CLOB_ARGS_3 K_CLOB_ARGS_4, "%r23"
102 #define K_CLOB_ARGS_2 K_CLOB_ARGS_3, "%r24"
103 #define K_CLOB_ARGS_1 K_CLOB_ARGS_2, "%r25"
104 #define K_CLOB_ARGS_0 K_CLOB_ARGS_1, "%r26"
105
106 #define _syscall0(type,name)                                            \
107 type name(void)                                                         \
108 {                                                                       \
109     return K_INLINE_SYSCALL(name, 0);                                   \
110 }
111
112 #define _syscall1(type,name,type1,arg1)                                 \
113 type name(type1 arg1)                                                   \
114 {                                                                       \
115     return K_INLINE_SYSCALL(name, 1, arg1);                             \
116 }
117
118 #define _syscall2(type,name,type1,arg1,type2,arg2)                      \
119 type name(type1 arg1, type2 arg2)                                       \
120 {                                                                       \
121     return K_INLINE_SYSCALL(name, 2, arg1, arg2);                       \
122 }
123
124 #define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3)           \
125 type name(type1 arg1, type2 arg2, type3 arg3)                           \
126 {                                                                       \
127     return K_INLINE_SYSCALL(name, 3, arg1, arg2, arg3);                 \
128 }
129
130 #define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \
131 type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4)               \
132 {                                                                       \
133     return K_INLINE_SYSCALL(name, 4, arg1, arg2, arg3, arg4);           \
134 }
135
136 /* select takes 5 arguments */
137 #define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,type5,arg5) \
138 type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5)   \
139 {                                                                       \
140     return K_INLINE_SYSCALL(name, 5, arg1, arg2, arg3, arg4, arg5);     \
141 }
142
143 #define __ARCH_WANT_OLD_READDIR
144 #define __ARCH_WANT_STAT64
145 #define __ARCH_WANT_SYS_ALARM
146 #define __ARCH_WANT_SYS_GETHOSTNAME
147 #define __ARCH_WANT_SYS_PAUSE
148 #define __ARCH_WANT_SYS_SGETMASK
149 #define __ARCH_WANT_SYS_SIGNAL
150 #define __ARCH_WANT_SYS_TIME
151 #define __ARCH_WANT_COMPAT_SYS_TIME
152 #define __ARCH_WANT_SYS_UTIME
153 #define __ARCH_WANT_SYS_WAITPID
154 #define __ARCH_WANT_SYS_SOCKETCALL
155 #define __ARCH_WANT_SYS_FADVISE64
156 #define __ARCH_WANT_SYS_GETPGRP
157 #define __ARCH_WANT_SYS_LLSEEK
158 #define __ARCH_WANT_SYS_NICE
159 #define __ARCH_WANT_SYS_OLD_GETRLIMIT
160 #define __ARCH_WANT_SYS_OLDUMOUNT
161 #define __ARCH_WANT_SYS_SIGPENDING
162 #define __ARCH_WANT_SYS_SIGPROCMASK
163 #define __ARCH_WANT_SYS_FORK
164 #define __ARCH_WANT_SYS_VFORK
165 #define __ARCH_WANT_SYS_CLONE
166
167 #endif /* __ASSEMBLY__ */
168
169 #undef STR
170
171 /*
172  * "Conditional" syscalls
173  *
174  * What we want is __attribute__((weak,alias("sys_ni_syscall"))),
175  * but it doesn't work on all toolchains, so we just do it by hand
176  */
177 #define cond_syscall(x) asm(".weak\t" #x "\n\t.set\t" #x ",sys_ni_syscall")
178
179 #endif /* _ASM_PARISC_UNISTD_H_ */