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 /* ftrace syscalls requires exporting the sys_call_table */
19 #ifdef CONFIG_FTRACE_SYSCALLS
20 extern const unsigned long *sys_call_table;
21 #endif /* CONFIG_FTRACE_SYSCALLS */
23 static inline long syscall_get_nr(struct task_struct *task,
26 return TRAP(regs) == 0xc00 ? regs->gpr[0] : -1L;
29 static inline void syscall_rollback(struct task_struct *task,
32 regs->gpr[3] = regs->orig_gpr3;
35 static inline long syscall_get_error(struct task_struct *task,
38 return (regs->ccr & 0x10000000) ? -regs->gpr[3] : 0;
41 static inline long syscall_get_return_value(struct task_struct *task,
47 static inline void syscall_set_return_value(struct task_struct *task,
52 regs->ccr |= 0x10000000L;
53 regs->gpr[3] = -error;
55 regs->ccr &= ~0x10000000L;
60 static inline void syscall_get_arguments(struct task_struct *task,
62 unsigned int i, unsigned int n,
67 if (test_tsk_thread_flag(task, TIF_32BIT)) {
69 * Zero-extend 32-bit argument values. The high bits are
70 * garbage ignored by the actual syscall dispatch.
73 args[n] = (u32) regs->gpr[3 + i + n];
77 memcpy(args, ®s->gpr[3 + i], n * sizeof(args[0]));
80 static inline void syscall_set_arguments(struct task_struct *task,
82 unsigned int i, unsigned int n,
83 const unsigned long *args)
86 memcpy(®s->gpr[3 + i], args, n * sizeof(args[0]));
89 #endif /* _ASM_SYSCALL_H */