forked from Minki/linux
97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
/*
|
|
* Magic syscall break down functions
|
|
*
|
|
* Copyright 2010 Analog Devices Inc.
|
|
*
|
|
* Licensed under the GPL-2 or later.
|
|
*/
|
|
|
|
#ifndef __ASM_BLACKFIN_SYSCALL_H__
|
|
#define __ASM_BLACKFIN_SYSCALL_H__
|
|
|
|
/*
|
|
* Blackfin syscalls are simple:
|
|
* enter:
|
|
* p0: syscall number
|
|
* r{0,1,2,3,4,5}: syscall args 0,1,2,3,4,5
|
|
* exit:
|
|
* r0: return/error value
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/sched.h>
|
|
#include <asm/ptrace.h>
|
|
|
|
static inline long
|
|
syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
|
|
{
|
|
return regs->p0;
|
|
}
|
|
|
|
static inline void
|
|
syscall_rollback(struct task_struct *task, struct pt_regs *regs)
|
|
{
|
|
regs->p0 = regs->orig_p0;
|
|
}
|
|
|
|
static inline long
|
|
syscall_get_error(struct task_struct *task, struct pt_regs *regs)
|
|
{
|
|
return IS_ERR_VALUE(regs->r0) ? regs->r0 : 0;
|
|
}
|
|
|
|
static inline long
|
|
syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
|
|
{
|
|
return regs->r0;
|
|
}
|
|
|
|
static inline void
|
|
syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
|
|
int error, long val)
|
|
{
|
|
regs->r0 = error ? -error : val;
|
|
}
|
|
|
|
/**
|
|
* syscall_get_arguments()
|
|
* @task: unused
|
|
* @regs: the register layout to extract syscall arguments from
|
|
* @i: first syscall argument to extract
|
|
* @n: number of syscall arguments to extract
|
|
* @args: array to return the syscall arguments in
|
|
*
|
|
* args[0] gets i'th argument, args[n - 1] gets the i+n-1'th argument
|
|
*/
|
|
static inline void
|
|
syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
|
|
unsigned int i, unsigned int n, unsigned long *args)
|
|
{
|
|
/*
|
|
* Assume the ptrace layout doesn't change -- r5 is first in memory,
|
|
* then r4, ..., then r0. So we simply reverse the ptrace register
|
|
* array in memory to store into the args array.
|
|
*/
|
|
long *aregs = ®s->r0 - i;
|
|
|
|
BUG_ON(i > 5 || i + n > 6);
|
|
|
|
while (n--)
|
|
*args++ = *aregs--;
|
|
}
|
|
|
|
/* See syscall_get_arguments() comments */
|
|
static inline void
|
|
syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
|
|
unsigned int i, unsigned int n, const unsigned long *args)
|
|
{
|
|
long *aregs = ®s->r0 - i;
|
|
|
|
BUG_ON(i > 5 || i + n > 6);
|
|
|
|
while (n--)
|
|
*aregs-- = *args++;
|
|
}
|
|
|
|
#endif
|