mirror of
https://github.com/torvalds/linux.git
synced 2024-12-30 06:41:43 +00:00
4a3b989322
Implement the new-style ptrace for FRV, including adding appropriate tracehooks. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
124 lines
2.7 KiB
C
124 lines
2.7 KiB
C
/* syscall parameter access functions
|
|
*
|
|
* Copyright (C) 2009 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef _ASM_SYSCALL_H
|
|
#define _ASM_SYSCALL_H
|
|
|
|
#include <linux/err.h>
|
|
#include <asm/ptrace.h>
|
|
|
|
/*
|
|
* Get the system call number or -1
|
|
*/
|
|
static inline long syscall_get_nr(struct task_struct *task,
|
|
struct pt_regs *regs)
|
|
{
|
|
return regs->syscallno;
|
|
}
|
|
|
|
/*
|
|
* Restore the clobbered GR8 register
|
|
* (1st syscall arg was overwritten with syscall return or error)
|
|
*/
|
|
static inline void syscall_rollback(struct task_struct *task,
|
|
struct pt_regs *regs)
|
|
{
|
|
regs->gr8 = regs->orig_gr8;
|
|
}
|
|
|
|
/*
|
|
* See if the syscall return value is an error, returning it if it is and 0 if
|
|
* not
|
|
*/
|
|
static inline long syscall_get_error(struct task_struct *task,
|
|
struct pt_regs *regs)
|
|
{
|
|
return IS_ERR_VALUE(regs->gr8) ? regs->gr8 : 0;
|
|
}
|
|
|
|
/*
|
|
* Get the syscall return value
|
|
*/
|
|
static inline long syscall_get_return_value(struct task_struct *task,
|
|
struct pt_regs *regs)
|
|
{
|
|
return regs->gr8;
|
|
}
|
|
|
|
/*
|
|
* Set the syscall return value
|
|
*/
|
|
static inline void syscall_set_return_value(struct task_struct *task,
|
|
struct pt_regs *regs,
|
|
int error, long val)
|
|
{
|
|
if (error)
|
|
regs->gr8 = -error;
|
|
else
|
|
regs->gr8 = val;
|
|
}
|
|
|
|
/*
|
|
* Retrieve the system call arguments
|
|
*/
|
|
static inline void syscall_get_arguments(struct task_struct *task,
|
|
struct pt_regs *regs,
|
|
unsigned int i, unsigned int n,
|
|
unsigned long *args)
|
|
{
|
|
/*
|
|
* Do this simply for now. If we need to start supporting
|
|
* fetching arguments from arbitrary indices, this will need some
|
|
* extra logic. Presently there are no in-tree users that depend
|
|
* on this behaviour.
|
|
*/
|
|
BUG_ON(i);
|
|
|
|
/* Argument pattern is: GR8, GR9, GR10, GR11, GR12, GR13 */
|
|
switch (n) {
|
|
case 6: args[5] = regs->gr13;
|
|
case 5: args[4] = regs->gr12;
|
|
case 4: args[3] = regs->gr11;
|
|
case 3: args[2] = regs->gr10;
|
|
case 2: args[1] = regs->gr9;
|
|
case 1: args[0] = regs->gr8;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Alter the system call arguments
|
|
*/
|
|
static inline void syscall_set_arguments(struct task_struct *task,
|
|
struct pt_regs *regs,
|
|
unsigned int i, unsigned int n,
|
|
const unsigned long *args)
|
|
{
|
|
/* Same note as above applies */
|
|
BUG_ON(i);
|
|
|
|
switch (n) {
|
|
case 6: regs->gr13 = args[5];
|
|
case 5: regs->gr12 = args[4];
|
|
case 4: regs->gr11 = args[3];
|
|
case 3: regs->gr10 = args[2];
|
|
case 2: regs->gr9 = args[1];
|
|
case 1: regs->gr8 = args[0];
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
#endif /* _ASM_SYSCALL_H */
|