2 * Access to user system call parameters and results
4 * Copyright (C) 2008 Imagination Technologies Ltd.
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_METAG_SYSCALL_H
14 #define _ASM_METAG_SYSCALL_H
16 #include <linux/sched.h>
17 #include <linux/err.h>
18 #include <linux/uaccess.h>
20 #include <asm/switch.h>
22 static inline long syscall_get_nr(struct task_struct *task,
28 * FIXME there's no way to find out how we got here other than to
29 * examine the memory at the PC to see if it is a syscall
32 if (get_user(insn, (unsigned long *)(regs->ctx.CurrPC - 4)))
35 if (insn == __METAG_SW_ENCODING(SYS))
36 return regs->ctx.DX[0].U1;
41 static inline void syscall_rollback(struct task_struct *task,
47 static inline long syscall_get_error(struct task_struct *task,
50 unsigned long error = regs->ctx.DX[0].U0;
51 return IS_ERR_VALUE(error) ? error : 0;
54 static inline long syscall_get_return_value(struct task_struct *task,
57 return regs->ctx.DX[0].U0;
60 static inline void syscall_set_return_value(struct task_struct *task,
64 regs->ctx.DX[0].U0 = (long) error ?: val;
67 static inline void syscall_get_arguments(struct task_struct *task,
69 unsigned int i, unsigned int n,
75 for (j = i, reg = 6 - i; j < (i + n); j++, reg--) {
77 args[j] = regs->ctx.DX[(reg + 1) / 2].U0;
79 args[j] = regs->ctx.DX[reg / 2].U1;
83 static inline void syscall_set_arguments(struct task_struct *task,
85 unsigned int i, unsigned int n,
86 const unsigned long *args)
91 for (reg = 6 - i; i < (i + n); i++, reg--) {
93 regs->ctx.DX[(reg + 1) / 2].U0 = args[i];
95 regs->ctx.DX[reg / 2].U1 = args[i];
99 #define NR_syscalls __NR_syscalls
101 /* generic syscall table */
102 extern const void *sys_call_table[];
104 #endif /* _ASM_METAG_SYSCALL_H */