LXR linux/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
  19static 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
  33static 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
  44static 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
  55static inline long syscall_get_return_value(struct task_struct *task,
  56                                            struct pt_regs *regs)
  57{
  58        return regs->r8;
  59}
  60
  61static 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
  82extern 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);
  85static 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
 126static 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 */
 164