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 <uapi/linux/audit.h> 17 #include <linux/sched.h> 18 #include <linux/err.h> 19 20 static inline long syscall_get_nr(struct task_struct *task, 21 struct pt_regs *regs) 22 { 23 if ((long)regs->cr_ifs < 0) /* Not a syscall */ 24 return -1; 25 26 return regs->r15; 27 } 28 29 static inline void syscall_rollback(struct task_struct *task, 30 struct pt_regs *regs) 31 { 32 /* do nothing */ 33 } 34 35 static inline long syscall_get_error(struct task_struct *task, 36 struct pt_regs *regs) 37 { 38 return regs->r10 == -1 ? regs->r8:0; 39 } 40 41 static inline long syscall_get_return_value(struct task_struct *task, 42 struct pt_regs *regs) 43 { 44 return regs->r8; 45 } 46 47 static inline void syscall_set_return_value(struct task_struct *task, 48 struct pt_regs *regs, 49 int error, long val) 50 { 51 if (error) { 52 /* error < 0, but ia64 uses > 0 return value */ 53 regs->r8 = -error; 54 regs->r10 = -1; 55 } else { 56 regs->r8 = val; 57 regs->r10 = 0; 58 } 59 } 60 61 extern void ia64_syscall_get_set_arguments(struct task_struct *task, 62 struct pt_regs *regs, unsigned long *args, int rw); 63 static inline void syscall_get_arguments(struct task_struct *task, 64 struct pt_regs *regs, 65 unsigned long *args) 66 { 67 ia64_syscall_get_set_arguments(task, regs, args, 0); 68 } 69 70 static inline void syscall_set_arguments(struct task_struct *task, 71 struct pt_regs *regs, 72 unsigned long *args) 73 { 74 ia64_syscall_get_set_arguments(task, regs, args, 1); 75 } 76 77 static inline int syscall_get_arch(void) 78 { 79 return AUDIT_ARCH_IA64; 80 } 81 #endif /* _ASM_SYSCALL_H */ 82