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#ifndef __ASM_SH_SYSCALL_32_H
#define __ASM_SH_SYSCALL_32_H
#include <linux/kernel.h>
#include <linux/sched.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 bool syscall_has_error(struct pt_regs *regs)
{
return (regs->sr & 0x1) ? true : false;
}
static inline void syscall_set_error(struct pt_regs *regs)
{
regs->sr |= 0x1;
}
static inline void syscall_clear_error(struct pt_regs *regs)
{
regs->sr &= ~0x1;
}
static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{
return syscall_has_error(regs) ? 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) {
syscall_set_error(regs);
regs->regs[0] = -error;
} else {
syscall_clear_error(regs);
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];
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();
}
}
#endif /* __ASM_SH_SYSCALL_32_H */
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