/* * 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 <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) /* * 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 kernel flag */      \	(_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()    do { } while (0) #endif