2 * Access to user system call parameters and results
4 * Copyright (C) 2008 Red Hat, Inc. All rights reserved.
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.
10 * See asm-generic/syscall.h for descriptions of what we must do here.
13 #ifndef _ASM_SYSCALL_H
14 #define _ASM_SYSCALL_H 1
16 #include <linux/sched.h>
18 static inline long syscall_get_nr(struct task_struct *task,
21 return TRAP(regs) == 0xc00 ? regs->gpr[0] : -1L;
24 static inline void syscall_rollback(struct task_struct *task,
27 regs->gpr[3] = regs->orig_gpr3;
30 static inline long syscall_get_error(struct task_struct *task,
33 return (regs->ccr & 0x1000) ? -regs->gpr[3] : 0;
36 static inline long syscall_get_return_value(struct task_struct *task,
42 static inline void syscall_set_return_value(struct task_struct *task,
48 regs->gpr[3] = -error;
50 regs->ccr &= ~0x1000L;
55 static inline void syscall_get_arguments(struct task_struct *task,
57 unsigned int i, unsigned int n,
62 if (test_tsk_thread_flag(task, TIF_32BIT)) {
64 * Zero-extend 32-bit argument values. The high bits are
65 * garbage ignored by the actual syscall dispatch.
68 args[n] = (u32) regs->gpr[3 + i + n];
72 memcpy(args, ®s->gpr[3 + i], n * sizeof(args[0]));
75 static inline void syscall_set_arguments(struct task_struct *task,
77 unsigned int i, unsigned int n,
78 const unsigned long *args)
81 memcpy(®s->gpr[3 + i], args, n * sizeof(args[0]));
84 #endif /* _ASM_SYSCALL_H */