/* SPDX-License-Identifier: GPL-2.0 */
|
#ifndef __ASM_SH_SYSCALL_32_H
|
#define __ASM_SH_SYSCALL_32_H
|
|
#include <uapi/linux/audit.h>
|
#include <linux/kernel.h>
|
#include <linux/sched.h>
|
#include <linux/err.h>
|
#include <asm/ptrace.h>
|
|
/* The system call number is given by the user in R3 */
|
static inline long syscall_get_nr(struct task_struct *task,
|
struct pt_regs *regs)
|
{
|
return (regs->tra >= 0) ? regs->regs[3] : -1L;
|
}
|
|
static inline void syscall_rollback(struct task_struct *task,
|
struct pt_regs *regs)
|
{
|
/*
|
* XXX: This needs some thought. On SH we don't
|
* save away the original r0 value anywhere.
|
*/
|
}
|
|
static inline long syscall_get_error(struct task_struct *task,
|
struct pt_regs *regs)
|
{
|
return IS_ERR_VALUE(regs->regs[0]) ? regs->regs[0] : 0;
|
}
|
|
static inline long syscall_get_return_value(struct task_struct *task,
|
struct pt_regs *regs)
|
{
|
return regs->regs[0];
|
}
|
|
static inline void syscall_set_return_value(struct task_struct *task,
|
struct pt_regs *regs,
|
int error, long val)
|
{
|
if (error)
|
regs->regs[0] = -error;
|
else
|
regs->regs[0] = val;
|
}
|
|
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: R4, R5, R6, R7, R0, R1 */
|
switch (n) {
|
case 6: args[5] = regs->regs[1];
|
case 5: args[4] = regs->regs[0];
|
case 4: args[3] = regs->regs[7];
|
case 3: args[2] = regs->regs[6];
|
case 2: args[1] = regs->regs[5];
|
case 1: args[0] = regs->regs[4];
|
case 0:
|
break;
|
default:
|
BUG();
|
}
|
}
|
|
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->regs[1] = args[5];
|
case 5: regs->regs[0] = args[4];
|
case 4: regs->regs[7] = args[3];
|
case 3: regs->regs[6] = args[2];
|
case 2: regs->regs[5] = args[1];
|
case 1: regs->regs[4] = args[0];
|
break;
|
default:
|
BUG();
|
}
|
}
|
|
static inline int syscall_get_arch(void)
|
{
|
int arch = AUDIT_ARCH_SH;
|
|
#ifdef CONFIG_CPU_LITTLE_ENDIAN
|
arch |= __AUDIT_ARCH_LE;
|
#endif
|
return arch;
|
}
|
#endif /* __ASM_SH_SYSCALL_32_H */
|
