/* * arch/sh/kernel/process_64.c * * This file handles the architecture-dependent parts of process handling.. * * Copyright (C) 2000, 2001  Paolo Alberelli * Copyright (C) 2003 - 2007  Paul Mundt * Copyright (C) 2003, 2004 Richard Curnow * * Started from SH3/4 version: *   Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima * *   In turn started from i386 version: *     Copyright (C) 1995  Linus Torvalds * * This file is subject to the terms and conditions of the GNU General Public * License.  See the file "COPYING" in the main directory of this archive * for more details. */#include <linux/mm.h>#include <linux/fs.h>#include <linux/ptrace.h>#include <linux/reboot.h>#include <linux/slab.h>#include <linux/init.h>#include <linux/module.h>#include <linux/io.h>#include <asm/syscalls.h>#include <asm/uaccess.h>#include <asm/pgtable.h>#include <asm/mmu_context.h>#include <asm/fpu.h>#include <asm/switch_to.h> struct task_struct *last_task_used_math = NULL;struct pt_regs fake_swapper_regs = { 0, }; void show_regs(struct pt_regs *regs){	unsigned long long ah, al, bh, bl, ch, cl; 	printk("\n");	show_regs_print_info(KERN_DEFAULT); 	ah = (regs->pc) >> 32;	al = (regs->pc) & 0xffffffff;	bh = (regs->regs[18]) >> 32;	bl = (regs->regs[18]) & 0xffffffff;	ch = (regs->regs[15]) >> 32;	cl = (regs->regs[15]) & 0xffffffff;	printk("PC  : %08Lx%08Lx LINK: %08Lx%08Lx SP  : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->sr) >> 32;	al = (regs->sr) & 0xffffffff;        asm volatile ("getcon   " __TEA ", %0" : "=r" (bh));        asm volatile ("getcon   " __TEA ", %0" : "=r" (bl));	bh = (bh) >> 32;	bl = (bl) & 0xffffffff;        asm volatile ("getcon   " __KCR0 ", %0" : "=r" (ch));        asm volatile ("getcon   " __KCR0 ", %0" : "=r" (cl));	ch = (ch) >> 32;	cl = (cl) & 0xffffffff;	printk("SR  : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[0]) >> 32;	al = (regs->regs[0]) & 0xffffffff;	bh = (regs->regs[1]) >> 32;	bl = (regs->regs[1]) & 0xffffffff;	ch = (regs->regs[2]) >> 32;	cl = (regs->regs[2]) & 0xffffffff;	printk("R0  : %08Lx%08Lx R1  : %08Lx%08Lx R2  : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[3]) >> 32;	al = (regs->regs[3]) & 0xffffffff;	bh = (regs->regs[4]) >> 32;	bl = (regs->regs[4]) & 0xffffffff;	ch = (regs->regs[5]) >> 32;	cl = (regs->regs[5]) & 0xffffffff;	printk("R3  : %08Lx%08Lx R4  : %08Lx%08Lx R5  : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[6]) >> 32;	al = (regs->regs[6]) & 0xffffffff;	bh = (regs->regs[7]) >> 32;	bl = (regs->regs[7]) & 0xffffffff;	ch = (regs->regs[8]) >> 32;	cl = (regs->regs[8]) & 0xffffffff;	printk("R6  : %08Lx%08Lx R7  : %08Lx%08Lx R8  : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[9]) >> 32;	al = (regs->regs[9]) & 0xffffffff;	bh = (regs->regs[10]) >> 32;	bl = (regs->regs[10]) & 0xffffffff;	ch = (regs->regs[11]) >> 32;	cl = (regs->regs[11]) & 0xffffffff;	printk("R9  : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[12]) >> 32;	al = (regs->regs[12]) & 0xffffffff;	bh = (regs->regs[13]) >> 32;	bl = (regs->regs[13]) & 0xffffffff;	ch = (regs->regs[14]) >> 32;	cl = (regs->regs[14]) & 0xffffffff;	printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[16]) >> 32;	al = (regs->regs[16]) & 0xffffffff;	bh = (regs->regs[17]) >> 32;	bl = (regs->regs[17]) & 0xffffffff;	ch = (regs->regs[19]) >> 32;	cl = (regs->regs[19]) & 0xffffffff;	printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[20]) >> 32;	al = (regs->regs[20]) & 0xffffffff;	bh = (regs->regs[21]) >> 32;	bl = (regs->regs[21]) & 0xffffffff;	ch = (regs->regs[22]) >> 32;	cl = (regs->regs[22]) & 0xffffffff;	printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[23]) >> 32;	al = (regs->regs[23]) & 0xffffffff;	bh = (regs->regs[24]) >> 32;	bl = (regs->regs[24]) & 0xffffffff;	ch = (regs->regs[25]) >> 32;	cl = (regs->regs[25]) & 0xffffffff;	printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[26]) >> 32;	al = (regs->regs[26]) & 0xffffffff;	bh = (regs->regs[27]) >> 32;	bl = (regs->regs[27]) & 0xffffffff;	ch = (regs->regs[28]) >> 32;	cl = (regs->regs[28]) & 0xffffffff;	printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[29]) >> 32;	al = (regs->regs[29]) & 0xffffffff;	bh = (regs->regs[30]) >> 32;	bl = (regs->regs[30]) & 0xffffffff;	ch = (regs->regs[31]) >> 32;	cl = (regs->regs[31]) & 0xffffffff;	printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[32]) >> 32;	al = (regs->regs[32]) & 0xffffffff;	bh = (regs->regs[33]) >> 32;	bl = (regs->regs[33]) & 0xffffffff;	ch = (regs->regs[34]) >> 32;	cl = (regs->regs[34]) & 0xffffffff;	printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[35]) >> 32;	al = (regs->regs[35]) & 0xffffffff;	bh = (regs->regs[36]) >> 32;	bl = (regs->regs[36]) & 0xffffffff;	ch = (regs->regs[37]) >> 32;	cl = (regs->regs[37]) & 0xffffffff;	printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[38]) >> 32;	al = (regs->regs[38]) & 0xffffffff;	bh = (regs->regs[39]) >> 32;	bl = (regs->regs[39]) & 0xffffffff;	ch = (regs->regs[40]) >> 32;	cl = (regs->regs[40]) & 0xffffffff;	printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[41]) >> 32;	al = (regs->regs[41]) & 0xffffffff;	bh = (regs->regs[42]) >> 32;	bl = (regs->regs[42]) & 0xffffffff;	ch = (regs->regs[43]) >> 32;	cl = (regs->regs[43]) & 0xffffffff;	printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[44]) >> 32;	al = (regs->regs[44]) & 0xffffffff;	bh = (regs->regs[45]) >> 32;	bl = (regs->regs[45]) & 0xffffffff;	ch = (regs->regs[46]) >> 32;	cl = (regs->regs[46]) & 0xffffffff;	printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[47]) >> 32;	al = (regs->regs[47]) & 0xffffffff;	bh = (regs->regs[48]) >> 32;	bl = (regs->regs[48]) & 0xffffffff;	ch = (regs->regs[49]) >> 32;	cl = (regs->regs[49]) & 0xffffffff;	printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[50]) >> 32;	al = (regs->regs[50]) & 0xffffffff;	bh = (regs->regs[51]) >> 32;	bl = (regs->regs[51]) & 0xffffffff;	ch = (regs->regs[52]) >> 32;	cl = (regs->regs[52]) & 0xffffffff;	printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[53]) >> 32;	al = (regs->regs[53]) & 0xffffffff;	bh = (regs->regs[54]) >> 32;	bl = (regs->regs[54]) & 0xffffffff;	ch = (regs->regs[55]) >> 32;	cl = (regs->regs[55]) & 0xffffffff;	printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[56]) >> 32;	al = (regs->regs[56]) & 0xffffffff;	bh = (regs->regs[57]) >> 32;	bl = (regs->regs[57]) & 0xffffffff;	ch = (regs->regs[58]) >> 32;	cl = (regs->regs[58]) & 0xffffffff;	printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[59]) >> 32;	al = (regs->regs[59]) & 0xffffffff;	bh = (regs->regs[60]) >> 32;	bl = (regs->regs[60]) & 0xffffffff;	ch = (regs->regs[61]) >> 32;	cl = (regs->regs[61]) & 0xffffffff;	printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->regs[62]) >> 32;	al = (regs->regs[62]) & 0xffffffff;	bh = (regs->tregs[0]) >> 32;	bl = (regs->tregs[0]) & 0xffffffff;	ch = (regs->tregs[1]) >> 32;	cl = (regs->tregs[1]) & 0xffffffff;	printk("R62 : %08Lx%08Lx T0  : %08Lx%08Lx T1  : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->tregs[2]) >> 32;	al = (regs->tregs[2]) & 0xffffffff;	bh = (regs->tregs[3]) >> 32;	bl = (regs->tregs[3]) & 0xffffffff;	ch = (regs->tregs[4]) >> 32;	cl = (regs->tregs[4]) & 0xffffffff;	printk("T2  : %08Lx%08Lx T3  : %08Lx%08Lx T4  : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	ah = (regs->tregs[5]) >> 32;	al = (regs->tregs[5]) & 0xffffffff;	bh = (regs->tregs[6]) >> 32;	bl = (regs->tregs[6]) & 0xffffffff;	ch = (regs->tregs[7]) >> 32;	cl = (regs->tregs[7]) & 0xffffffff;	printk("T5  : %08Lx%08Lx T6  : %08Lx%08Lx T7  : %08Lx%08Lx\n",	       ah, al, bh, bl, ch, cl); 	/*	 * If we're in kernel mode, dump the stack too..	 */	if (!user_mode(regs)) {		void show_stack(struct task_struct *tsk, unsigned long *sp);		unsigned long sp = regs->regs[15] & 0xffffffff;		struct task_struct *tsk = get_current(); 		tsk->thread.kregs = regs; 		show_stack(tsk, (unsigned long *)sp);	}} /* * Free current thread data structures etc.. */void exit_thread(void){	/*	 * See arch/sparc/kernel/process.c for the precedent for doing	 * this -- RPC.	 *	 * The SH-5 FPU save/restore approach relies on	 * last_task_used_math pointing to a live task_struct.  When	 * another task tries to use the FPU for the 1st time, the FPUDIS	 * trap handling (see arch/sh/kernel/cpu/sh5/fpu.c) will save the	 * existing FPU state to the FP regs field within	 * last_task_used_math before re-loading the new task's FPU state	 * (or initialising it if the FPU has been used before).  So if	 * last_task_used_math is stale, and its page has already been	 * re-allocated for another use, the consequences are rather	 * grim. Unless we null it here, there is no other path through	 * which it would get safely nulled.	 */#ifdef CONFIG_SH_FPU	if (last_task_used_math == current) {		last_task_used_math = NULL;	}#endif} void flush_thread(void){ 	/* Called by fs/exec.c (setup_new_exec) to remove traces of a	 * previously running executable. */#ifdef CONFIG_SH_FPU	if (last_task_used_math == current) {		last_task_used_math = NULL;	}	/* Force FPU state to be reinitialised after exec */	clear_used_math();#endif 	/* if we are a kernel thread, about to change to user thread,         * update kreg         */	if(current->thread.kregs==&fake_swapper_regs) {          current->thread.kregs =             ((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1);	  current->thread.uregs = current->thread.kregs;	}} void release_thread(struct task_struct *dead_task){	/* do nothing */} /* Fill in the fpu structure for a core dump.. */int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu){#ifdef CONFIG_SH_FPU	int fpvalid;	struct task_struct *tsk = current; 	fpvalid = !!tsk_used_math(tsk);	if (fpvalid) {		if (current == last_task_used_math) {			enable_fpu();			save_fpu(tsk);			disable_fpu();			last_task_used_math = 0;			regs->sr |= SR_FD;		} 		memcpy(fpu, &tsk->thread.xstate->hardfpu, sizeof(*fpu));	} 	return fpvalid;#else	return 0; /* Task didn't use the fpu at all. */#endif}EXPORT_SYMBOL(dump_fpu); asmlinkage void ret_from_fork(void);asmlinkage void ret_from_kernel_thread(void); int copy_thread(unsigned long clone_flags, unsigned long usp,		unsigned long arg, struct task_struct *p){	struct pt_regs *childregs; #ifdef CONFIG_SH_FPU	/* can't happen for a kernel thread */	if (last_task_used_math == current) {		enable_fpu();		save_fpu(current);		disable_fpu();		last_task_used_math = NULL;		current_pt_regs()->sr |= SR_FD;	}#endif	/* Copy from sh version */	childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1;	p->thread.sp = (unsigned long) childregs; 	if (unlikely(p->flags & PF_KTHREAD)) {		memset(childregs, 0, sizeof(struct pt_regs));		childregs->regs[2] = (unsigned long)arg;		childregs->regs[3] = (unsigned long)usp;		childregs->sr = (1 << 30); /* not user_mode */		childregs->sr |= SR_FD; /* Invalidate FPU flag */		p->thread.pc = (unsigned long) ret_from_kernel_thread;		return 0;	}	*childregs = *current_pt_regs(); 	/*	 * Sign extend the edited stack.	 * Note that thread.pc and thread.pc will stay	 * 32-bit wide and context switch must take care	 * of NEFF sign extension.	 */	if (usp)		childregs->regs[15] = neff_sign_extend(usp);	p->thread.uregs = childregs; 	childregs->regs[9] = 0; /* Set return value for child */	childregs->sr |= SR_FD; /* Invalidate FPU flag */ 	p->thread.pc = (unsigned long) ret_from_fork; 	return 0;} #ifdef CONFIG_FRAME_POINTERstatic int in_sh64_switch_to(unsigned long pc){	extern char __sh64_switch_to_end;	/* For a sleeping task, the PC is somewhere in the middle of the function,	   so we don't have to worry about masking the LSB off */	return (pc >= (unsigned long) sh64_switch_to) &&	       (pc < (unsigned long) &__sh64_switch_to_end);}#endif unsigned long get_wchan(struct task_struct *p){	unsigned long pc; 	if (!p || p == current || p->state == TASK_RUNNING)		return 0; 	/*	 * The same comment as on the Alpha applies here, too ...	 */	pc = thread_saved_pc(p); #ifdef CONFIG_FRAME_POINTER	if (in_sh64_switch_to(pc)) {		unsigned long schedule_fp;		unsigned long sh64_switch_to_fp;		unsigned long schedule_caller_pc; 		sh64_switch_to_fp = (long) p->thread.sp;		/* r14 is saved at offset 4 in the sh64_switch_to frame */		schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4); 		/* and the caller of 'schedule' is (currently!) saved at offset 24		   in the frame of schedule (from disasm) */		schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24);		return schedule_caller_pc;	}#endif	return pc;}