1 files changed, 87 insertions, 317 deletions

diff --git a/arch/sh/kernel/process_32.c b/arch/sh/kernel/process_32.c
index b98e37a1f54..2885fc9d9dc 100644
--- a/arch/sh/kernel/process_32.c
+++ b/arch/sh/kernel/process_32.c
@@ -7,131 +7,43 @@
  *
  *  SuperH version:  Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
  *		     Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC
- *		     Copyright (C) 2002 - 2007  Paul Mundt
+ *		     Copyright (C) 2002 - 2008  Paul Mundt
+ *
+ * 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/module.h>
 #include <linux/mm.h>
+#include <linux/slab.h>
 #include <linux/elfcore.h>
-#include <linux/pm.h>
 #include <linux/kallsyms.h>
-#include <linux/kexec.h>
-#include <linux/kdebug.h>
-#include <linux/tick.h>
-#include <linux/reboot.h>
 #include <linux/fs.h>
-#include <linux/preempt.h>
+#include <linux/ftrace.h>
+#include <linux/hw_breakpoint.h>
+#include <linux/prefetch.h>
+#include <linux/stackprotector.h>
 #include <asm/uaccess.h>
 #include <asm/mmu_context.h>
-#include <asm/pgalloc.h>
-#include <asm/system.h>
-#include <asm/ubc.h>
 #include <asm/fpu.h>
-
-static int hlt_counter;
-int ubc_usercnt = 0;
-
-void (*pm_idle)(void);
-void (*pm_power_off)(void);
-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);
-
-static int __init nohlt_setup(char *__unused)
-{
-	hlt_counter = 1;
-	return 1;
-}
-__setup("nohlt", nohlt_setup);
-
-static int __init hlt_setup(char *__unused)
-{
-	hlt_counter = 0;
-	return 1;
-}
-__setup("hlt", hlt_setup);
-
-void default_idle(void)
-{
-	if (!hlt_counter) {
-		clear_thread_flag(TIF_POLLING_NRFLAG);
-		smp_mb__after_clear_bit();
-		set_bl_bit();
-		while (!need_resched())
-			cpu_sleep();
-		clear_bl_bit();
-		set_thread_flag(TIF_POLLING_NRFLAG);
-	} else
-		while (!need_resched())
-			cpu_relax();
-}
-
-void cpu_idle(void)
-{
-	set_thread_flag(TIF_POLLING_NRFLAG);
-
-	/* endless idle loop with no priority at all */
-	while (1) {
-		void (*idle)(void) = pm_idle;
-
-		if (!idle)
-			idle = default_idle;
-
-		tick_nohz_stop_sched_tick();
-		while (!need_resched())
-			idle();
-		tick_nohz_restart_sched_tick();
-
-		preempt_enable_no_resched();
-		schedule();
-		preempt_disable();
-		check_pgt_cache();
-	}
-}
-
-void machine_restart(char * __unused)
-{
-	/* SR.BL=1 and invoke address error to let CPU reset (manual reset) */
-	asm volatile("ldc %0, sr\n\t"
-		     "mov.l @%1, %0" : : "r" (0x10000000), "r" (0x80000001));
-}
-
-void machine_halt(void)
-{
-	local_irq_disable();
-
-	while (1)
-		cpu_sleep();
-}
-
-void machine_power_off(void)
-{
-	if (pm_power_off)
-		pm_power_off();
-}
+#include <asm/syscalls.h>
+#include <asm/switch_to.h>
 
 void show_regs(struct pt_regs * regs)
 {
 	printk("\n");
-	printk("Pid : %d, Comm: %20s\n", task_pid_nr(current), current->comm);
+	show_regs_print_info(KERN_DEFAULT);
+
 	print_symbol("PC is at %s\n", instruction_pointer(regs));
+	print_symbol("PR is at %s\n", regs->pr);
+
 	printk("PC  : %08lx SP  : %08lx SR  : %08lx ",
 	       regs->pc, regs->regs[15], regs->sr);
 #ifdef CONFIG_MMU
-	printk("TEA : %08x    ", ctrl_inl(MMU_TEA));
+	printk("TEA : %08x\n", __raw_readl(MMU_TEA));
 #else
-	printk("                  ");
+	printk("\n");
 #endif
-	printk("%s\n", print_tainted());
 
 	printk("R0  : %08lx R1  : %08lx R2  : %08lx R3  : %08lx\n",
 	       regs->regs[0],regs->regs[1],
@@ -149,59 +61,35 @@ void show_regs(struct pt_regs * regs)
 	       regs->mach, regs->macl, regs->gbr, regs->pr);
 
 	show_trace(NULL, (unsigned long *)regs->regs[15], regs);
+	show_code(regs);
 }
 
-/*
- * Create a kernel thread
- */
-
-/*
- * This is the mechanism for creating a new kernel thread.
- *
- */
-extern void kernel_thread_helper(void);
-__asm__(".align 5\n"
-	"kernel_thread_helper:\n\t"
-	"jsr	@r5\n\t"
-	" nop\n\t"
-	"mov.l	1f, r1\n\t"
-	"jsr	@r1\n\t"
-	" mov	r0, r4\n\t"
-	".align 2\n\t"
-	"1:.long do_exit");
-
-/* Don't use this in BL=1(cli).  Or else, CPU resets! */
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
+void start_thread(struct pt_regs *regs, unsigned long new_pc,
+		  unsigned long new_sp)
 {
-	struct pt_regs regs;
-
-	memset(&regs, 0, sizeof(regs));
-	regs.regs[4] = (unsigned long)arg;
-	regs.regs[5] = (unsigned long)fn;
-
-	regs.pc = (unsigned long)kernel_thread_helper;
-	regs.sr = (1 << 30);
+	regs->pr = 0;
+	regs->sr = SR_FD;
+	regs->pc = new_pc;
+	regs->regs[15] = new_sp;
 
-	/* Ok, create the new process.. */
-	return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
-		       &regs, 0, NULL, NULL);
+	free_thread_xstate(current);
 }
+EXPORT_SYMBOL(start_thread);
 
 /*
  * Free current thread data structures etc..
  */
 void exit_thread(void)
 {
-	if (current->thread.ubc_pc) {
-		current->thread.ubc_pc = 0;
-		ubc_usercnt -= 1;
-	}
 }
 
 void flush_thread(void)
 {
-#if defined(CONFIG_SH_FPU)
 	struct task_struct *tsk = current;
+
+	flush_ptrace_hw_breakpoint(tsk);
+
+#if defined(CONFIG_SH_FPU)
 	/* Forget lazy FPU state */
 	clear_fpu(tsk, task_pt_regs(tsk));
 	clear_used_math();
@@ -222,107 +110,88 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
 	struct task_struct *tsk = current;
 
 	fpvalid = !!tsk_used_math(tsk);
-	if (fpvalid) {
-		unlazy_fpu(tsk, regs);
-		memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu));
-	}
+	if (fpvalid)
+		fpvalid = !fpregs_get(tsk, NULL, 0,
+				      sizeof(struct user_fpu_struct),
+				      fpu, NULL);
 #endif
 
 	return fpvalid;
 }
+EXPORT_SYMBOL(dump_fpu);
 
 asmlinkage void ret_from_fork(void);
+asmlinkage void ret_from_kernel_thread(void);
 
-int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
-		unsigned long unused,
-		struct task_struct *p, struct pt_regs *regs)
+int copy_thread(unsigned long clone_flags, unsigned long usp,
+		unsigned long arg, struct task_struct *p)
 {
 	struct thread_info *ti = task_thread_info(p);
 	struct pt_regs *childregs;
-#if defined(CONFIG_SH_FPU)
+
+#if defined(CONFIG_SH_DSP)
 	struct task_struct *tsk = current;
 
-	unlazy_fpu(tsk, regs);
-	p->thread.fpu = tsk->thread.fpu;
-	copy_to_stopped_child_used_math(p);
+	if (is_dsp_enabled(tsk)) {
+		/* We can use the __save_dsp or just copy the struct:
+		 * __save_dsp(p);
+		 * p->thread.dsp_status.status |= SR_DSP
+		 */
+		p->thread.dsp_status = tsk->thread.dsp_status;
+	}
 #endif
 
-	childregs = task_pt_regs(p);
-	*childregs = *regs;
+	memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
 
-	if (user_mode(regs)) {
-		childregs->regs[15] = usp;
-		ti->addr_limit = USER_DS;
-	} else {
-		childregs->regs[15] = (unsigned long)childregs;
+	childregs = task_pt_regs(p);
+	p->thread.sp = (unsigned long) childregs;
+	if (unlikely(p->flags & PF_KTHREAD)) {
+		memset(childregs, 0, sizeof(struct pt_regs));
+		p->thread.pc = (unsigned long) ret_from_kernel_thread;
+		childregs->regs[4] = arg;
+		childregs->regs[5] = usp;
+		childregs->sr = SR_MD;
+#if defined(CONFIG_SH_FPU)
+		childregs->sr |= SR_FD;
+#endif
 		ti->addr_limit = KERNEL_DS;
+		ti->status &= ~TS_USEDFPU;
+		p->thread.fpu_counter = 0;
+		return 0;
 	}
+	*childregs = *current_pt_regs();
+
+	if (usp)
+		childregs->regs[15] = usp;
+	ti->addr_limit = USER_DS;
 
 	if (clone_flags & CLONE_SETTLS)
 		childregs->gbr = childregs->regs[0];
 
 	childregs->regs[0] = 0; /* Set return value for child */
-
-	p->thread.sp = (unsigned long) childregs;
 	p->thread.pc = (unsigned long) ret_from_fork;
-
-	p->thread.ubc_pc = 0;
-
 	return 0;
 }
 
-/* Tracing by user break controller.  */
-static void ubc_set_tracing(int asid, unsigned long pc)
-{
-#if defined(CONFIG_CPU_SH4A)
-	unsigned long val;
-
-	val = (UBC_CBR_ID_INST | UBC_CBR_RW_READ | UBC_CBR_CE);
-	val |= (UBC_CBR_AIE | UBC_CBR_AIV_SET(asid));
-
-	ctrl_outl(val, UBC_CBR0);
-	ctrl_outl(pc,  UBC_CAR0);
-	ctrl_outl(0x0, UBC_CAMR0);
-	ctrl_outl(0x0, UBC_CBCR);
-
-	val = (UBC_CRR_RES | UBC_CRR_PCB | UBC_CRR_BIE);
-	ctrl_outl(val, UBC_CRR0);
-
-	/* Read UBC register that we wrote last, for checking update */
-	val = ctrl_inl(UBC_CRR0);
-
-#else	/* CONFIG_CPU_SH4A */
-	ctrl_outl(pc, UBC_BARA);
-
-#ifdef CONFIG_MMU
-	ctrl_outb(asid, UBC_BASRA);
-#endif
-
-	ctrl_outl(0, UBC_BAMRA);
-
-	if (current_cpu_data.type == CPU_SH7729 ||
-	    current_cpu_data.type == CPU_SH7710 ||
-	    current_cpu_data.type == CPU_SH7712) {
-		ctrl_outw(BBR_INST | BBR_READ | BBR_CPU, UBC_BBRA);
-		ctrl_outl(BRCR_PCBA | BRCR_PCTE, UBC_BRCR);
-	} else {
-		ctrl_outw(BBR_INST | BBR_READ, UBC_BBRA);
-		ctrl_outw(BRCR_PCBA, UBC_BRCR);
-	}
-#endif	/* CONFIG_CPU_SH4A */
-}
-
 /*
  *	switch_to(x,y) should switch tasks from x to y.
  *
  */
-struct task_struct *__switch_to(struct task_struct *prev,
-				struct task_struct *next)
+__notrace_funcgraph struct task_struct *
+__switch_to(struct task_struct *prev, struct task_struct *next)
 {
-#if defined(CONFIG_SH_FPU)
-	unlazy_fpu(prev, task_pt_regs(prev));
+	struct thread_struct *next_t = &next->thread;
+
+#if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
+	__stack_chk_guard = next->stack_canary;
 #endif
 
+	unlazy_fpu(prev, task_pt_regs(prev));
+
+	/* we're going to use this soon, after a few expensive things */
+	if (next->thread.fpu_counter > 5)
+		prefetch(next_t->xstate);
+
 #ifdef CONFIG_MMU
 	/*
 	 * Restore the kernel mode register
@@ -333,100 +202,17 @@ struct task_struct *__switch_to(struct task_struct *prev,
 		     : "r" (task_thread_info(next)));
 #endif
 
-	/* If no tasks are using the UBC, we're done */
-	if (ubc_usercnt == 0)
-		/* If no tasks are using the UBC, we're done */;
-	else if (next->thread.ubc_pc && next->mm) {
-		int asid = 0;
-#ifdef CONFIG_MMU
-		asid |= cpu_asid(smp_processor_id(), next->mm);
-#endif
-		ubc_set_tracing(asid, next->thread.ubc_pc);
-	} else {
-#if defined(CONFIG_CPU_SH4A)
-		ctrl_outl(UBC_CBR_INIT, UBC_CBR0);
-		ctrl_outl(UBC_CRR_INIT, UBC_CRR0);
-#else
-		ctrl_outw(0, UBC_BBRA);
-		ctrl_outw(0, UBC_BBRB);
-#endif
-	}
+	/*
+	 * If the task has used fpu the last 5 timeslices, just do a full
+	 * restore of the math state immediately to avoid the trap; the
+	 * chances of needing FPU soon are obviously high now
+	 */
+	if (next->thread.fpu_counter > 5)
+		__fpu_state_restore();
 
 	return prev;
 }
 
-asmlinkage int sys_fork(unsigned long r4, unsigned long r5,
-			unsigned long r6, unsigned long r7,
-			struct pt_regs __regs)
-{
-#ifdef CONFIG_MMU
-	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
-	return do_fork(SIGCHLD, regs->regs[15], regs, 0, NULL, NULL);
-#else
-	/* fork almost works, enough to trick you into looking elsewhere :-( */
-	return -EINVAL;
-#endif
-}
-
-asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
-			 unsigned long parent_tidptr,
-			 unsigned long child_tidptr,
-			 struct pt_regs __regs)
-{
-	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
-	if (!newsp)
-		newsp = regs->regs[15];
-	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 r4, unsigned long r5,
-			 unsigned long r6, unsigned long r7,
-			 struct pt_regs __regs)
-{
-	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
-	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->regs[15], 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 r7,
-			  struct pt_regs __regs)
-{
-	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
-	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;
-}
-
 unsigned long get_wchan(struct task_struct *p)
 {
 	unsigned long pc;
@@ -448,19 +234,3 @@ unsigned long get_wchan(struct task_struct *p)
 
 	return pc;
 }
-
-asmlinkage void break_point_trap(void)
-{
-	/* Clear tracing.  */
-#if defined(CONFIG_CPU_SH4A)
-	ctrl_outl(UBC_CBR_INIT, UBC_CBR0);
-	ctrl_outl(UBC_CRR_INIT, UBC_CRR0);
-#else
-	ctrl_outw(0, UBC_BBRA);
-	ctrl_outw(0, UBC_BBRB);
-#endif
-	current->thread.ubc_pc = 0;
-	ubc_usercnt -= 1;
-
-	force_sig(SIGTRAP, current);
-}