/* *  linux/arch/m32r/kernel/process.c * *  Copyright (c) 2001, 2002  Hiroyuki Kondo, Hirokazu Takata, *                            Hitoshi Yamamoto *  Taken from sh version. *    Copyright (C) 1995  Linus Torvalds *    SuperH version:  Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima */ #undef DEBUG_PROCESS#ifdef DEBUG_PROCESS#define DPRINTK(fmt, args...)  printk("%s:%d:%s: " fmt, __FILE__, __LINE__, \  __FUNCTION__, ##args)#else#define DPRINTK(fmt, args...)#endif /* * This file handles the architecture-dependent parts of process handling.. */ #include <linux/fs.h>#include <linux/module.h>#include <linux/ptrace.h>#include <linux/unistd.h>#include <linux/slab.h>#include <linux/hardirq.h> #include <asm/io.h>#include <asm/uaccess.h>#include <asm/mmu_context.h>#include <asm/elf.h>#include <asm/m32r.h> #include <linux/err.h> static int hlt_counter=0; /* * Return saved PC of a blocked thread. */unsigned long thread_saved_pc(struct task_struct *tsk){	return tsk->thread.lr;} /* * Powermanagement idle function, if any.. */void (*pm_idle)(void) = NULL;EXPORT_SYMBOL(pm_idle); void (*pm_power_off)(void) = NULL;EXPORT_SYMBOL(pm_power_off); void disable_hlt(void){	hlt_counter++;} EXPORT_SYMBOL(disable_hlt); void enable_hlt(void){	hlt_counter--;} EXPORT_SYMBOL(enable_hlt); /* * We use this is we don't have any better * idle routine.. */void default_idle(void){	/* M32R_FIXME: Please use "cpu_sleep" mode.  */	cpu_relax();} /* * On SMP it's slightly faster (but much more power-consuming!) * to poll the ->work.need_resched flag instead of waiting for the * cross-CPU IPI to arrive. Use this option with caution. */static void poll_idle (void){	/* M32R_FIXME */	cpu_relax();} /* * The idle thread. There's no useful work to be * done, so just try to conserve power and have a * low exit latency (ie sit in a loop waiting for * somebody to say that they'd like to reschedule) */void cpu_idle (void){	/* endless idle loop with no priority at all */	while (1) {		while (!need_resched()) {			void (*idle)(void) = pm_idle; 			if (!idle)				idle = default_idle; 			idle();		}		preempt_enable_no_resched();		schedule();		preempt_disable();	}} void machine_restart(char *__unused){#if defined(CONFIG_PLAT_MAPPI3)	outw(1, (unsigned long)PLD_REBOOT);#endif 	printk("Please push reset button!\n");	while (1)		cpu_relax();} void machine_halt(void){	printk("Please push reset button!\n");	while (1)		cpu_relax();} void machine_power_off(void){	/* M32R_FIXME */} static int __init idle_setup (char *str){	if (!strncmp(str, "poll", 4)) {		printk("using poll in idle threads.\n");		pm_idle = poll_idle;	} else if (!strncmp(str, "sleep", 4)) {		printk("using sleep in idle threads.\n");		pm_idle = default_idle;	} 	return 1;} __setup("idle=", idle_setup); void show_regs(struct pt_regs * regs){	printk("\n");	printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \	  regs->bpc, regs->psw, regs->lr, regs->fp);	printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \	  regs->bbpc, regs->bbpsw, regs->spu, regs->spi);	printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \	  regs->r0, regs->r1, regs->r2, regs->r3);	printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \	  regs->r4, regs->r5, regs->r6, regs->r7);	printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \	  regs->r8, regs->r9, regs->r10, regs->r11);	printk("R12[%08lx]\n", \	  regs->r12); #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)	printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \	  regs->acc0h, regs->acc0l);	printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \	  regs->acc1h, regs->acc1l);#elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)	printk("ACCH[%08lx]:ACCL[%08lx]\n", \	  regs->acc0h, regs->acc0l);#else#error unknown isa configuration#endif} /* * Create a kernel thread */ /* * This is the mechanism for creating a new kernel thread. * * NOTE! Only a kernel-only process(ie the swapper or direct descendants * who haven't done an "execve()") should use this: it will work within * a system call from a "real" process, but the process memory space will * not be free'd until both the parent and the child have exited. */static void kernel_thread_helper(void *nouse, int (*fn)(void *), void *arg){	fn(arg);	do_exit(-1);} int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags){	struct pt_regs regs; 	memset(&regs, 0, sizeof (regs));	regs.r1 = (unsigned long)fn;	regs.r2 = (unsigned long)arg; 	regs.bpc = (unsigned long)kernel_thread_helper; 	regs.psw = M32R_PSW_BIE; 	/* Ok, create the new process. */	return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL,		NULL);} /* * Free current thread data structures etc.. */void exit_thread(void){	/* Nothing to do. */	DPRINTK("pid = %d\n", current->pid);} void flush_thread(void){	DPRINTK("pid = %d\n", current->pid);	memset(&current->thread.debug_trap, 0, sizeof(struct debug_trap));} void release_thread(struct task_struct *dead_task){	/* do nothing */	DPRINTK("pid = %d\n", dead_task->pid);} /* Fill in the fpu structure for a core dump.. */int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu){	return 0; /* Task didn't use the fpu at all. */} int copy_thread(int nr, unsigned long clone_flags, unsigned long spu,	unsigned long unused, struct task_struct *tsk, struct pt_regs *regs){	struct pt_regs *childregs = task_pt_regs(tsk);	extern void ret_from_fork(void); 	/* Copy registers */	*childregs = *regs; 	childregs->spu = spu;	childregs->r0 = 0;	/* Child gets zero as return value */	regs->r0 = tsk->pid;	tsk->thread.sp = (unsigned long)childregs;	tsk->thread.lr = (unsigned long)ret_from_fork; 	return 0;} /* * Capture the user space registers if the task is not running (in user space) */int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs){	/* M32R_FIXME */	return 1;} asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2,	unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,	struct pt_regs regs){#ifdef CONFIG_MMU	return do_fork(SIGCHLD, regs.spu, &regs, 0, NULL, NULL);#else	return -EINVAL;#endif /* CONFIG_MMU */} asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,			 unsigned long parent_tidptr,			 unsigned long child_tidptr,			 unsigned long r4, unsigned long r5, unsigned long r6,			 struct pt_regs regs){	if (!newsp)		newsp = regs.spu; 	return do_fork(clone_flags, newsp, &regs, 0,		       (int __user *)parent_tidptr, (int __user *)child_tidptr);} /* * This is trivial, and on the face of it looks like it * could equally well be done in user mode. * * Not so, for quite unobvious reasons - register pressure. * In user mode vfork() cannot have a stack frame, and if * done by calling the "clone()" system call directly, you * do not have enough call-clobbered registers to hold all * the information you need. */asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2,	unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,	struct pt_regs regs){	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, &regs, 0,			NULL, NULL);} /* * sys_execve() executes a new program. */asmlinkage int sys_execve(char __user *ufilename, char __user * __user *uargv,			  char __user * __user *uenvp,			  unsigned long r3, unsigned long r4, unsigned long r5,			  unsigned long r6, struct pt_regs regs){	int error;	char *filename; 	filename = getname(ufilename);	error = PTR_ERR(filename);	if (IS_ERR(filename))		goto out; 	error = do_execve(filename, uargv, uenvp, &regs);	if (error == 0) {		task_lock(current);		current->ptrace &= ~PT_DTRACE;		task_unlock(current);	}	putname(filename);out:	return error;} /* * These bracket the sleeping functions.. */#define first_sched	((unsigned long) scheduling_functions_start_here)#define last_sched	((unsigned long) scheduling_functions_end_here) unsigned long get_wchan(struct task_struct *p){	/* M32R_FIXME */	return (0);}