1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Access to user system call parameters and results
4 *
5 * Copyright (C) 2008 Intel Corp. Shaohua Li <shaohua.li@intel.com>
6 *
7 * See asm-generic/syscall.h for descriptions of what we must do here.
8 */
9
10 #ifndef _ASM_SYSCALL_H
11 #define _ASM_SYSCALL_H 1
12
13 #include <uapi/linux/audit.h>
14 #include <linux/sched.h>
15 #include <linux/err.h>
16
syscall_get_nr(struct task_struct * task,struct pt_regs * regs)17 static inline long syscall_get_nr(struct task_struct *task,
18 struct pt_regs *regs)
19 {
20 if ((long)regs->cr_ifs < 0) /* Not a syscall */
21 return -1;
22
23 return regs->r15;
24 }
25
syscall_rollback(struct task_struct * task,struct pt_regs * regs)26 static inline void syscall_rollback(struct task_struct *task,
27 struct pt_regs *regs)
28 {
29 /* do nothing */
30 }
31
syscall_get_error(struct task_struct * task,struct pt_regs * regs)32 static inline long syscall_get_error(struct task_struct *task,
33 struct pt_regs *regs)
34 {
35 return regs->r10 == -1 ? -regs->r8:0;
36 }
37
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)38 static inline long syscall_get_return_value(struct task_struct *task,
39 struct pt_regs *regs)
40 {
41 return regs->r8;
42 }
43
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)44 static inline void syscall_set_return_value(struct task_struct *task,
45 struct pt_regs *regs,
46 int error, long val)
47 {
48 if (error) {
49 /* error < 0, but ia64 uses > 0 return value */
50 regs->r8 = -error;
51 regs->r10 = -1;
52 } else {
53 regs->r8 = val;
54 regs->r10 = 0;
55 }
56 }
57
58 extern void syscall_get_arguments(struct task_struct *task,
59 struct pt_regs *regs, unsigned long *args);
60
syscall_get_arch(struct task_struct * task)61 static inline int syscall_get_arch(struct task_struct *task)
62 {
63 return AUDIT_ARCH_IA64;
64 }
65 #endif /* _ASM_SYSCALL_H */
66