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 return regs->r15; 26 } 27 28 static inline void syscall_rollback(struct task_struct *task, 29 struct pt_regs *regs) 30 { 31 /* do nothing */ 32 } 33 34 static inline long syscall_get_error(struct task_struct *task, 35 struct pt_regs *regs) 36 { 37 return regs->r10 == -1 ? regs->r8:0; 38 } 39 40 static inline long syscall_get_return_value(struct task_struct *task, 41 struct pt_regs *regs) 42 { 43 return regs->r8; 44 } 45 46 static inline void syscall_set_return_value(struct task_struct *task, 47 struct pt_regs *regs, 48 int error, long val) 49 { 50 if (error) { 51 /* error < 0, but ia64 uses > 0 return value */ 52 regs->r8 = -error; 53 regs->r10 = -1; 54 } else { 55 regs->r8 = val; 56 regs->r10 = 0; 57 } 58 } 59 60 extern void ia64_syscall_get_set_arguments(struct task_struct *task, 61 struct pt_regs *regs, unsigned int i, unsigned int n, 62 unsigned long *args, int rw); 63 static inline void syscall_get_arguments(struct task_struct *task, 64 struct pt_regs *regs, 65 unsigned int i, unsigned int n, 66 unsigned long *args) 67 { 68 BUG_ON(i + n > 6); 69 70 ia64_syscall_get_set_arguments(task, regs, i, n, args, 0); 71 } 72 73 static inline void syscall_set_arguments(struct task_struct *task, 74 struct pt_regs *regs, 75 unsigned int i, unsigned int n, 76 unsigned long *args) 77 { 78 BUG_ON(i + n > 6); 79 80 ia64_syscall_get_set_arguments(task, regs, i, n, args, 1); 81 } 82 #endif /* _ASM_SYSCALL_H */ 83