2 * Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved.
3 * Copyright 2010 Tilera Corporation. All Rights Reserved.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation, version 2.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
12 * NON INFRINGEMENT. See the GNU General Public License for
15 * See asm-generic/syscall.h for descriptions of what we must do here.
18 #ifndef _ASM_TILE_SYSCALL_H
19 #define _ASM_TILE_SYSCALL_H
21 #include <linux/sched.h>
22 #include <linux/err.h>
23 #include <linux/audit.h>
24 #include <linux/compat.h>
27 /* The array of function pointers for syscalls. */
28 extern void *sys_call_table[];
30 extern void *compat_sys_call_table[];
34 * Only the low 32 bits of orig_r0 are meaningful, so we return int.
35 * This importantly ignores the high bits on 64-bit, so comparisons
36 * sign-extend the low 32 bits.
38 static inline int syscall_get_nr(struct task_struct *t, struct pt_regs *regs)
40 return regs->regs[TREG_SYSCALL_NR];
43 static inline void syscall_rollback(struct task_struct *task,
46 regs->regs[0] = regs->orig_r0;
49 static inline long syscall_get_error(struct task_struct *task,
52 unsigned long error = regs->regs[0];
53 return IS_ERR_VALUE(error) ? error : 0;
56 static inline long syscall_get_return_value(struct task_struct *task,
62 static inline void syscall_set_return_value(struct task_struct *task,
67 /* R0 is the passed-in negative error, R1 is positive. */
68 regs->regs[0] = error;
69 regs->regs[1] = -error;
71 /* R1 set to zero to indicate no error. */
77 static inline void syscall_get_arguments(struct task_struct *task,
79 unsigned int i, unsigned int n,
83 memcpy(args, ®s[i], n * sizeof(args[0]));
86 static inline void syscall_set_arguments(struct task_struct *task,
88 unsigned int i, unsigned int n,
89 const unsigned long *args)
92 memcpy(®s[i], args, n * sizeof(args[0]));
96 * We don't care about endianness (__AUDIT_ARCH_LE bit) here because
97 * tile has the same system calls both on little- and big- endian.
99 static inline int syscall_get_arch(void)
101 if (is_compat_task())
102 return AUDIT_ARCH_TILEGX32;
105 return AUDIT_ARCH_TILEGX;
107 return AUDIT_ARCH_TILEPRO;
111 #endif /* _ASM_TILE_SYSCALL_H */