141 lines
3.5 KiB
C
141 lines
3.5 KiB
C
/*
|
|
* include/asm-h8300/processor.h
|
|
*
|
|
* Copyright (C) 2002 Yoshinori Sato
|
|
*
|
|
* Based on: linux/asm-m68nommu/processor.h
|
|
*
|
|
* Copyright (C) 1995 Hamish Macdonald
|
|
*/
|
|
|
|
#ifndef __ASM_H8300_PROCESSOR_H
|
|
#define __ASM_H8300_PROCESSOR_H
|
|
|
|
/*
|
|
* Default implementation of macro that returns current
|
|
* instruction pointer ("program counter").
|
|
*/
|
|
#define current_text_addr() ({ __label__ _l; _l: &&_l;})
|
|
|
|
#include <linux/compiler.h>
|
|
#include <asm/segment.h>
|
|
#include <asm/fpu.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/current.h>
|
|
|
|
static inline unsigned long rdusp(void) {
|
|
extern unsigned int sw_usp;
|
|
return(sw_usp);
|
|
}
|
|
|
|
static inline void wrusp(unsigned long usp) {
|
|
extern unsigned int sw_usp;
|
|
sw_usp = usp;
|
|
}
|
|
|
|
/*
|
|
* User space process size: 3.75GB. This is hardcoded into a few places,
|
|
* so don't change it unless you know what you are doing.
|
|
*/
|
|
#define TASK_SIZE (0xFFFFFFFFUL)
|
|
|
|
#ifdef __KERNEL__
|
|
#define STACK_TOP TASK_SIZE
|
|
#define STACK_TOP_MAX STACK_TOP
|
|
#endif
|
|
|
|
/*
|
|
* This decides where the kernel will search for a free chunk of vm
|
|
* space during mmap's. We won't be using it
|
|
*/
|
|
#define TASK_UNMAPPED_BASE 0
|
|
|
|
struct thread_struct {
|
|
unsigned long ksp; /* kernel stack pointer */
|
|
unsigned long usp; /* user stack pointer */
|
|
unsigned long ccr; /* saved status register */
|
|
unsigned long esp0; /* points to SR of stack frame */
|
|
struct {
|
|
unsigned short *addr;
|
|
unsigned short inst;
|
|
} breakinfo;
|
|
};
|
|
|
|
#define INIT_THREAD { \
|
|
.ksp = sizeof(init_stack) + (unsigned long)init_stack, \
|
|
.usp = 0, \
|
|
.ccr = PS_S, \
|
|
.esp0 = 0, \
|
|
.breakinfo = { \
|
|
.addr = (unsigned short *)-1, \
|
|
.inst = 0 \
|
|
} \
|
|
}
|
|
|
|
/*
|
|
* Do necessary setup to start up a newly executed thread.
|
|
*
|
|
* pass the data segment into user programs if it exists,
|
|
* it can't hurt anything as far as I can tell
|
|
*/
|
|
#if defined(__H8300H__)
|
|
#define start_thread(_regs, _pc, _usp) \
|
|
do { \
|
|
set_fs(USER_DS); /* reads from user space */ \
|
|
(_regs)->pc = (_pc); \
|
|
(_regs)->ccr = 0x00; /* clear all flags */ \
|
|
(_regs)->er5 = current->mm->start_data; /* GOT base */ \
|
|
wrusp((unsigned long)(_usp) - sizeof(unsigned long)*3); \
|
|
} while(0)
|
|
#endif
|
|
#if defined(__H8300S__)
|
|
#define start_thread(_regs, _pc, _usp) \
|
|
do { \
|
|
set_fs(USER_DS); /* reads from user space */ \
|
|
(_regs)->pc = (_pc); \
|
|
(_regs)->ccr = 0x00; /* clear kernel flag */ \
|
|
(_regs)->exr = 0x78; /* enable all interrupts */ \
|
|
(_regs)->er5 = current->mm->start_data; /* GOT base */ \
|
|
/* 14 = space for retaddr(4), vector(4), er0(4) and ext(2) on stack */ \
|
|
wrusp(((unsigned long)(_usp)) - 14); \
|
|
} while(0)
|
|
#endif
|
|
|
|
/* Forward declaration, a strange C thing */
|
|
struct task_struct;
|
|
|
|
/* Free all resources held by a thread. */
|
|
static inline void release_thread(struct task_struct *dead_task)
|
|
{
|
|
}
|
|
|
|
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
|
|
|
|
#define prepare_to_copy(tsk) do { } while (0)
|
|
|
|
/*
|
|
* Free current thread data structures etc..
|
|
*/
|
|
static inline void exit_thread(void)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Return saved PC of a blocked thread.
|
|
*/
|
|
unsigned long thread_saved_pc(struct task_struct *tsk);
|
|
unsigned long get_wchan(struct task_struct *p);
|
|
|
|
#define KSTK_EIP(tsk) \
|
|
({ \
|
|
unsigned long eip = 0; \
|
|
if ((tsk)->thread.esp0 > PAGE_SIZE && \
|
|
MAP_NR((tsk)->thread.esp0) < max_mapnr) \
|
|
eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
|
|
eip; })
|
|
#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
|
|
|
|
#define cpu_relax() barrier()
|
|
|
|
#endif
|