Merge branch 'akpm'
[linux-2.6/next.git] / arch / s390 / include / asm / syscall.h
blob5c0246b955d80e411250623c400c3387f23568b7
1 /*
2 * Access to user system call parameters and results
4 * Copyright IBM Corp. 2008
5 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License (version 2 only)
9 * as published by the Free Software Foundation.
12 #ifndef _ASM_SYSCALL_H
13 #define _ASM_SYSCALL_H 1
15 #include <linux/sched.h>
16 #include <asm/ptrace.h>
19 * The syscall table always contains 32 bit pointers since we know that the
20 * address of the function to be called is (way) below 4GB. So the "int"
21 * type here is what we want [need] for both 32 bit and 64 bit systems.
23 extern const unsigned int sys_call_table[];
25 static inline long syscall_get_nr(struct task_struct *task,
26 struct pt_regs *regs)
28 return regs->svcnr ? regs->svcnr : -1;
31 static inline void syscall_rollback(struct task_struct *task,
32 struct pt_regs *regs)
34 regs->gprs[2] = regs->orig_gpr2;
37 static inline long syscall_get_error(struct task_struct *task,
38 struct pt_regs *regs)
40 return (regs->gprs[2] >= -4096UL) ? -regs->gprs[2] : 0;
43 static inline long syscall_get_return_value(struct task_struct *task,
44 struct pt_regs *regs)
46 return regs->gprs[2];
49 static inline void syscall_set_return_value(struct task_struct *task,
50 struct pt_regs *regs,
51 int error, long val)
53 regs->gprs[2] = error ? -error : val;
56 static inline void syscall_get_arguments(struct task_struct *task,
57 struct pt_regs *regs,
58 unsigned int i, unsigned int n,
59 unsigned long *args)
61 unsigned long mask = -1UL;
63 BUG_ON(i + n > 6);
64 #ifdef CONFIG_COMPAT
65 if (test_tsk_thread_flag(task, TIF_31BIT))
66 mask = 0xffffffff;
67 #endif
68 while (n-- > 0)
69 if (i + n > 0)
70 args[n] = regs->gprs[2 + i + n] & mask;
71 if (i == 0)
72 args[0] = regs->orig_gpr2 & mask;
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)
80 BUG_ON(i + n > 6);
81 while (n-- > 0)
82 if (i + n > 0)
83 regs->gprs[2 + i + n] = args[n];
84 if (i == 0)
85 regs->orig_gpr2 = args[0];
88 #endif /* _ASM_SYSCALL_H */