arch/ia64/include/asm/syscall.h

   1 /*
   2  * Access to user system call parameters and results
   3  *
   4  * Copyright (C) 2008 Intel Corp.  Shaohua Li <shaohua.li@intel.com>
   5  *
   6  * This copyrighted material is made available to anyone wishing to use,
   7  * modify, copy, or redistribute it subject to the terms and conditions
   8  * of the GNU General Public License v.2.
   9  *
  10  * See asm-generic/syscall.h for descriptions of what we must do here.
  11  */
  12
  13 #ifndef _ASM_SYSCALL_H
  14 #define _ASM_SYSCALL_H  1
  15
  16 #include <linux/sched.h>
  17 #include <linux/err.h>
  18
  19 static inline long syscall_get_nr(struct task_struct *task,
  20                                   struct pt_regs *regs)
  21 {
  22         if ((long)regs->cr_ifs < 0) /* Not a syscall */
  23                 return -1;
  24
  25 #ifdef CONFIG_IA32_SUPPORT
  26         if (IS_IA32_PROCESS(regs))
  27                 return regs->r1;
  28 #endif
  29
  30         return regs->r15;
  31 }
  32
  33 static inline void syscall_rollback(struct task_struct *task,
  34                                     struct pt_regs *regs)
  35 {
  36 #ifdef CONFIG_IA32_SUPPORT
  37         if (IS_IA32_PROCESS(regs))
  38                 regs->r8 = regs->r1;
  39 #endif
  40
  41         /* do nothing */
  42 }
  43
  44 static inline long syscall_get_error(struct task_struct *task,
  45                                      struct pt_regs *regs)
  46 {
  47 #ifdef CONFIG_IA32_SUPPORT
  48         if (IS_IA32_PROCESS(regs))
  49                 return regs->r8;
  50 #endif
  51
  52         return regs->r10 == -1 ? regs->r8:0;
  53 }
  54
  55 static inline long syscall_get_return_value(struct task_struct *task,
  56                                             struct pt_regs *regs)
  57 {
  58         return regs->r8;
  59 }
  60
  61 static inline void syscall_set_return_value(struct task_struct *task,
  62                                             struct pt_regs *regs,
  63                                             int error, long val)
  64 {
  65 #ifdef CONFIG_IA32_SUPPORT
  66         if (IS_IA32_PROCESS(regs)) {
  67                 regs->r8 = (long) error ? error : val;
  68                 return;
  69         }
  70 #endif
  71
  72         if (error) {
  73                 /* error < 0, but ia64 uses > 0 return value */
  74                 regs->r8 = -error;
  75                 regs->r10 = -1;
  76         } else {
  77                 regs->r8 = val;
  78                 regs->r10 = 0;
  79         }
  80 }
  81
  82 extern void ia64_syscall_get_set_arguments(struct task_struct *task,
  83         struct pt_regs *regs, unsigned int i, unsigned int n,
  84         unsigned long *args, int rw);
  85 static inline void syscall_get_arguments(struct task_struct *task,
  86                                          struct pt_regs *regs,
  87                                          unsigned int i, unsigned int n,
  88                                          unsigned long *args)
  89 {
  90         BUG_ON(i + n > 6);
  91
  92 #ifdef CONFIG_IA32_SUPPORT
  93         if (IS_IA32_PROCESS(regs)) {
  94                 switch (i + n) {
  95                 case 6:
  96                         if (!n--) break;
  97                         *args++ = regs->r13;
  98                 case 5:
  99                         if (!n--) break;
 100                         *args++ = regs->r15;
 101                 case 4:
 102                         if (!n--) break;
 103                         *args++ = regs->r14;
 104                 case 3:
 105                         if (!n--) break;
 106                         *args++ = regs->r10;
 107                 case 2:
 108                         if (!n--) break;
 109                         *args++ = regs->r9;
 110                 case 1:
 111                         if (!n--) break;
 112                         *args++ = regs->r11;
 113                 case 0:
 114                         if (!n--) break;
 115                 default:
 116                         BUG();
 117                         break;
 118                 }
 119
 120                 return;
 121         }
 122 #endif
 123         ia64_syscall_get_set_arguments(task, regs, i, n, args, 0);
 124 }
 125
 126 static inline void syscall_set_arguments(struct task_struct *task,
 127                                          struct pt_regs *regs,
 128                                          unsigned int i, unsigned int n,
 129                                          unsigned long *args)
 130 {
 131         BUG_ON(i + n > 6);
 132
 133 #ifdef CONFIG_IA32_SUPPORT
 134         if (IS_IA32_PROCESS(regs)) {
 135                 switch (i + n) {
 136                 case 6:
 137                         if (!n--) break;
 138                         regs->r13 = *args++;
 139                 case 5:
 140                         if (!n--) break;
 141                         regs->r15 = *args++;
 142                 case 4:
 143                         if (!n--) break;
 144                         regs->r14 = *args++;
 145                 case 3:
 146                         if (!n--) break;
 147                         regs->r10 = *args++;
 148                 case 2:
 149                         if (!n--) break;
 150                         regs->r9 = *args++;
 151                 case 1:
 152                         if (!n--) break;
 153                         regs->r11 = *args++;
 154                 case 0:
 155                         if (!n--) break;
 156                 }
 157
 158                 return;
 159         }
 160 #endif
 161         ia64_syscall_get_set_arguments(task, regs, i, n, args, 1);
 162 }
 163 #endif  /* _ASM_SYSCALL_H */