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sh: Provide asm/syscall.h for SH-5.

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This provides the asm/syscall.h implementation for sh64 parts.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2008-12-10 19:46:18 +09:00
parent 6ac034375f
commit 94e2fb3d3e
3 changed files with 108 additions and 32 deletions
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76
arch/sh/include/asm/syscall_64.h
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@@ -1,6 +1,80 @@
#ifndef __ASM_SH_SYSCALL_64_H
#define __ASM_SH_SYSCALL_64_H
#include <asm-generic/syscall.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <asm/ptrace.h>
/* The system call number is given by the user in R9 */
static inline long syscall_get_nr(struct task_struct *task,
struct pt_regs *regs)
{
return (regs->syscall_nr >= 0) ? regs->regs[9] : -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 R9 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[9] : 0;
}
static inline long syscall_get_return_value(struct task_struct *task,
struct pt_regs *regs)
{
return regs->regs[9];
}
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[9] = -error;
} else {
syscall_clear_error(regs);
regs->regs[9] = val;
}
}
static inline void syscall_get_arguments(struct task_struct *task,
struct pt_regs *regs,
unsigned int i, unsigned int n,
unsigned long *args)
{
BUG_ON(i + n > 6);
memcpy(args, &regs->reg[2 + i], n * sizeof(args[0]));
}
static inline void syscall_set_arguments(struct task_struct *task,
struct pt_regs *regs,
unsigned int i, unsigned int n,
const unsigned long *args)
{
BUG_ON(i + n > 6);
memcpy(&regs->reg[2 + i], args, n * sizeof(args[0]));
}
#endif /* __ASM_SH_SYSCALL_64_H */