arch/parisc/include/asm/unistd.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_PARISC_UNISTD_H_
   3 #define _ASM_PARISC_UNISTD_H_
   4
   5 #include <uapi/asm/unistd.h>
   6
   7 #ifndef __ASSEMBLY__
   8
   9 #define SYS_ify(syscall_name)   __NR_##syscall_name
  10
  11 #ifndef ASM_LINE_SEP
  12 # define ASM_LINE_SEP ;
  13 #endif
  14
  15 /* Definition taken from glibc 2.3.3
  16  * sysdeps/unix/sysv/linux/hppa/sysdep.h
  17  */
  18
  19 #ifdef PIC
  20 /* WARNING: CANNOT BE USED IN A NOP! */
  21 # define K_STW_ASM_PIC  "       copy %%r19, %%r4\n"
  22 # define K_LDW_ASM_PIC  "       copy %%r4, %%r19\n"
  23 # define K_USING_GR4    "%r4",
  24 #else
  25 # define K_STW_ASM_PIC  " \n"
  26 # define K_LDW_ASM_PIC  " \n"
  27 # define K_USING_GR4
  28 #endif
  29
  30 /* GCC has to be warned that a syscall may clobber all the ABI
  31    registers listed as "caller-saves", see page 8, Table 2
  32    in section 2.2.6 of the PA-RISC RUN-TIME architecture
  33    document. However! r28 is the result and will conflict with
  34    the clobber list so it is left out. Also the input arguments
  35    registers r20 -> r26 will conflict with the list so they
  36    are treated specially. Although r19 is clobbered by the syscall
  37    we cannot say this because it would violate ABI, thus we say
  38    r4 is clobbered and use that register to save/restore r19
  39    across the syscall. */
  40
  41 #define K_CALL_CLOB_REGS "%r1", "%r2", K_USING_GR4 \
  42                          "%r20", "%r29", "%r31"
  43
  44 #undef K_INLINE_SYSCALL
  45 #define K_INLINE_SYSCALL(name, nr, args...)     ({                      \
  46         long __sys_res;                                                 \
  47         {                                                               \
  48                 register unsigned long __res __asm__("r28");            \
  49                 K_LOAD_ARGS_##nr(args)                                  \
  50                 /* FIXME: HACK stw/ldw r19 around syscall */            \
  51                 __asm__ volatile(                                       \
  52                         K_STW_ASM_PIC                                   \
  53                         "       ble  0x100(%%sr2, %%r0)\n"              \
  54                         "       ldi %1, %%r20\n"                        \
  55                         K_LDW_ASM_PIC                                   \
  56                         : "=r" (__res)                                  \
  57                         : "i" (SYS_ify(name)) K_ASM_ARGS_##nr           \
  58                         : "memory", K_CALL_CLOB_REGS K_CLOB_ARGS_##nr   \
  59                 );                                                      \
  60                 __sys_res = (long)__res;                                \
  61         }                                                               \
  62         if ( (unsigned long)__sys_res >= (unsigned long)-4095 ){        \
  63                 errno = -__sys_res;                                     \
  64                 __sys_res = -1;                                         \
  65         }                                                               \
  66         __sys_res;                                                      \
  67 })
  68
  69 #define K_LOAD_ARGS_0()
  70 #define K_LOAD_ARGS_1(r26)                                      \
  71         register unsigned long __r26 __asm__("r26") = (unsigned long)(r26);   \
  72         K_LOAD_ARGS_0()
  73 #define K_LOAD_ARGS_2(r26,r25)                                  \
  74         register unsigned long __r25 __asm__("r25") = (unsigned long)(r25);   \
  75         K_LOAD_ARGS_1(r26)
  76 #define K_LOAD_ARGS_3(r26,r25,r24)                              \
  77         register unsigned long __r24 __asm__("r24") = (unsigned long)(r24);   \
  78         K_LOAD_ARGS_2(r26,r25)
  79 #define K_LOAD_ARGS_4(r26,r25,r24,r23)                          \
  80         register unsigned long __r23 __asm__("r23") = (unsigned long)(r23);   \
  81         K_LOAD_ARGS_3(r26,r25,r24)
  82 #define K_LOAD_ARGS_5(r26,r25,r24,r23,r22)                      \
  83         register unsigned long __r22 __asm__("r22") = (unsigned long)(r22);   \
  84         K_LOAD_ARGS_4(r26,r25,r24,r23)
  85 #define K_LOAD_ARGS_6(r26,r25,r24,r23,r22,r21)                  \
  86         register unsigned long __r21 __asm__("r21") = (unsigned long)(r21);   \
  87         K_LOAD_ARGS_5(r26,r25,r24,r23,r22)
  88
  89 /* Even with zero args we use r20 for the syscall number */
  90 #define K_ASM_ARGS_0
  91 #define K_ASM_ARGS_1 K_ASM_ARGS_0, "r" (__r26)
  92 #define K_ASM_ARGS_2 K_ASM_ARGS_1, "r" (__r25)
  93 #define K_ASM_ARGS_3 K_ASM_ARGS_2, "r" (__r24)
  94 #define K_ASM_ARGS_4 K_ASM_ARGS_3, "r" (__r23)
  95 #define K_ASM_ARGS_5 K_ASM_ARGS_4, "r" (__r22)
  96 #define K_ASM_ARGS_6 K_ASM_ARGS_5, "r" (__r21)
  97
  98 /* The registers not listed as inputs but clobbered */
  99 #define K_CLOB_ARGS_6
 100 #define K_CLOB_ARGS_5 K_CLOB_ARGS_6, "%r21"
 101 #define K_CLOB_ARGS_4 K_CLOB_ARGS_5, "%r22"
 102 #define K_CLOB_ARGS_3 K_CLOB_ARGS_4, "%r23"
 103 #define K_CLOB_ARGS_2 K_CLOB_ARGS_3, "%r24"
 104 #define K_CLOB_ARGS_1 K_CLOB_ARGS_2, "%r25"
 105 #define K_CLOB_ARGS_0 K_CLOB_ARGS_1, "%r26"
 106
 107 #define _syscall0(type,name)                                            \
 108 type name(void)                                                         \
 109 {                                                                       \
 110     return K_INLINE_SYSCALL(name, 0);                                   \
 111 }
 112
 113 #define _syscall1(type,name,type1,arg1)                                 \
 114 type name(type1 arg1)                                                   \
 115 {                                                                       \
 116     return K_INLINE_SYSCALL(name, 1, arg1);                             \
 117 }
 118
 119 #define _syscall2(type,name,type1,arg1,type2,arg2)                      \
 120 type name(type1 arg1, type2 arg2)                                       \
 121 {                                                                       \
 122     return K_INLINE_SYSCALL(name, 2, arg1, arg2);                       \
 123 }
 124
 125 #define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3)           \
 126 type name(type1 arg1, type2 arg2, type3 arg3)                           \
 127 {                                                                       \
 128     return K_INLINE_SYSCALL(name, 3, arg1, arg2, arg3);                 \
 129 }
 130
 131 #define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \
 132 type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4)               \
 133 {                                                                       \
 134     return K_INLINE_SYSCALL(name, 4, arg1, arg2, arg3, arg4);           \
 135 }
 136
 137 /* select takes 5 arguments */
 138 #define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,type5,arg5) \
 139 type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5)   \
 140 {                                                                       \
 141     return K_INLINE_SYSCALL(name, 5, arg1, arg2, arg3, arg4, arg5);     \
 142 }
 143
 144 #define __ARCH_WANT_OLD_READDIR
 145 #define __ARCH_WANT_STAT64
 146 #define __ARCH_WANT_SYS_ALARM
 147 #define __ARCH_WANT_SYS_GETHOSTNAME
 148 #define __ARCH_WANT_SYS_PAUSE
 149 #define __ARCH_WANT_SYS_SIGNAL
 150 #define __ARCH_WANT_SYS_TIME
 151 #define __ARCH_WANT_COMPAT_SYS_TIME
 152 #define __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL
 153 #define __ARCH_WANT_SYS_UTIME
 154 #define __ARCH_WANT_SYS_WAITPID
 155 #define __ARCH_WANT_SYS_SOCKETCALL
 156 #define __ARCH_WANT_SYS_FADVISE64
 157 #define __ARCH_WANT_SYS_GETPGRP
 158 #define __ARCH_WANT_SYS_LLSEEK
 159 #define __ARCH_WANT_SYS_NICE
 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 #define __ARCH_WANT_COMPAT_SYS_SENDFILE
 167
 168 #endif /* __ASSEMBLY__ */
 169
 170 #undef STR
 171
 172 #endif /* _ASM_PARISC_UNISTD_H_ */