| Vineet Gupta | 4adeefe | 2013-01-18 15:12:18 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | */ |
| 8 | |
| 9 | #ifndef _ASM_ARC_SYSCALL_H |
| 10 | #define _ASM_ARC_SYSCALL_H 1 |
| 11 | |
| 12 | #include <linux/err.h> |
| 13 | #include <linux/sched.h> |
| 14 | #include <asm/unistd.h> |
| 15 | #include <asm/ptrace.h> /* in_syscall() */ |
| 16 | |
| 17 | static inline long |
| 18 | syscall_get_nr(struct task_struct *task, struct pt_regs *regs) |
| 19 | { |
| 20 | if (user_mode(regs) && in_syscall(regs)) |
| 21 | return regs->orig_r8; |
| 22 | else |
| 23 | return -1; |
| 24 | } |
| 25 | |
| 26 | static inline void |
| 27 | syscall_rollback(struct task_struct *task, struct pt_regs *regs) |
| 28 | { |
| 29 | /* XXX: I can't fathom how pt_regs->r8 will be clobbered ? */ |
| 30 | regs->r8 = regs->orig_r8; |
| 31 | } |
| 32 | |
| 33 | static inline long |
| 34 | syscall_get_error(struct task_struct *task, struct pt_regs *regs) |
| 35 | { |
| 36 | /* 0 if syscall succeeded, otherwise -Errorcode */ |
| 37 | return IS_ERR_VALUE(regs->r0) ? regs->r0 : 0; |
| 38 | } |
| 39 | |
| 40 | static inline long |
| 41 | syscall_get_return_value(struct task_struct *task, struct pt_regs *regs) |
| 42 | { |
| 43 | return regs->r0; |
| 44 | } |
| 45 | |
| 46 | static inline void |
| 47 | syscall_set_return_value(struct task_struct *task, struct pt_regs *regs, |
| 48 | int error, long val) |
| 49 | { |
| 50 | regs->r0 = (long) error ?: val; |
| 51 | } |
| 52 | |
| 53 | /* |
| 54 | * @i: argument index [0,5] |
| 55 | * @n: number of arguments; n+i must be [1,6]. |
| 56 | */ |
| 57 | static inline void |
| 58 | syscall_get_arguments(struct task_struct *task, struct pt_regs *regs, |
| 59 | unsigned int i, unsigned int n, unsigned long *args) |
| 60 | { |
| 61 | unsigned long *inside_ptregs = &(regs->r0); |
| 62 | inside_ptregs -= i; |
| 63 | |
| 64 | BUG_ON((i + n) > 6); |
| 65 | |
| 66 | while (n--) { |
| 67 | args[i++] = (*inside_ptregs); |
| 68 | inside_ptregs--; |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | #endif |