1 /*
2 * Access to user system call parameters and results
3 *
4 * Copyright (C) 2008 Red Hat, Inc. All rights reserved.
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
syscall_get_nr(struct task_struct * task,struct pt_regs * regs)18 static inline long syscall_get_nr(struct task_struct *task,
19 struct pt_regs *regs)
20 {
21 return TRAP(regs) == 0xc00 ? regs->gpr[0] : -1L;
22 }
23
syscall_rollback(struct task_struct * task,struct pt_regs * regs)24 static inline void syscall_rollback(struct task_struct *task,
25 struct pt_regs *regs)
26 {
27 regs->gpr[3] = regs->orig_gpr3;
28 }
29
syscall_get_error(struct task_struct * task,struct pt_regs * regs)30 static inline long syscall_get_error(struct task_struct *task,
31 struct pt_regs *regs)
32 {
33 return (regs->ccr & 0x10000000) ? -regs->gpr[3] : 0;
34 }
35
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)36 static inline long syscall_get_return_value(struct task_struct *task,
37 struct pt_regs *regs)
38 {
39 return regs->gpr[3];
40 }
41
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)42 static inline void syscall_set_return_value(struct task_struct *task,
43 struct pt_regs *regs,
44 int error, long val)
45 {
46 if (error) {
47 regs->ccr |= 0x10000000L;
48 regs->gpr[3] = -error;
49 } else {
50 regs->ccr &= ~0x10000000L;
51 regs->gpr[3] = val;
52 }
53 }
54
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned int i,unsigned int n,unsigned long * args)55 static inline void syscall_get_arguments(struct task_struct *task,
56 struct pt_regs *regs,
57 unsigned int i, unsigned int n,
58 unsigned long *args)
59 {
60 BUG_ON(i + n > 6);
61 #ifdef CONFIG_PPC64
62 if (test_tsk_thread_flag(task, TIF_32BIT)) {
63 /*
64 * Zero-extend 32-bit argument values. The high bits are
65 * garbage ignored by the actual syscall dispatch.
66 */
67 while (n-- > 0)
68 args[n] = (u32) regs->gpr[3 + i + n];
69 return;
70 }
71 #endif
72 memcpy(args, ®s->gpr[3 + i], n * sizeof(args[0]));
73 }
74
syscall_set_arguments(struct task_struct * task,struct pt_regs * regs,unsigned int i,unsigned int n,const unsigned long * args)75 static inline void syscall_set_arguments(struct task_struct *task,
76 struct pt_regs *regs,
77 unsigned int i, unsigned int n,
78 const unsigned long *args)
79 {
80 BUG_ON(i + n > 6);
81 memcpy(®s->gpr[3 + i], args, n * sizeof(args[0]));
82 }
83
84 #endif /* _ASM_SYSCALL_H */
85