Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 531 insertions, 0 deletions

diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c
new file mode 100644
index 000000000000..3d024590c24e
--- /dev/null
+++ b/arch/sh/kernel/process.c
@@ -0,0 +1,531 @@
+/* $Id: process.c,v 1.28 2004/05/05 16:54:23 lethal Exp $
+ *
+ *  linux/arch/sh/kernel/process.c
+ *
+ *  Copyright (C) 1995  Linus Torvalds
+ *
+ *  SuperH version:  Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
+ */
+
+/*
+ * This file handles the architecture-dependent parts of process handling..
+ */
+
+#include <linux/module.h>
+#include <linux/unistd.h>
+#include <linux/mm.h>
+#include <linux/elfcore.h>
+#include <linux/slab.h>
+#include <linux/a.out.h>
+#include <linux/ptrace.h>
+#include <linux/platform.h>
+#include <linux/kallsyms.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/mmu_context.h>
+#include <asm/elf.h>
+#if defined(CONFIG_SH_HS7751RVOIP)
+#include <asm/hs7751rvoip/hs7751rvoip.h>
+#elif defined(CONFIG_SH_RTS7751R2D)
+#include <asm/rts7751r2d/rts7751r2d.h>
+#endif
+
+static int hlt_counter=0;
+
+int ubc_usercnt = 0;
+
+#define HARD_IDLE_TIMEOUT (HZ / 3)
+
+void disable_hlt(void)
+{
+	hlt_counter++;
+}
+
+EXPORT_SYMBOL(disable_hlt);
+
+void enable_hlt(void)
+{
+	hlt_counter--;
+}
+
+EXPORT_SYMBOL(enable_hlt);
+
+void default_idle(void)
+{
+	/* endless idle loop with no priority at all */
+	while (1) {
+		if (hlt_counter) {
+			while (1)
+				if (need_resched())
+					break;
+		} else {
+			while (!need_resched())
+				cpu_sleep();
+		}
+
+		schedule();
+	}
+}
+
+void cpu_idle(void)
+{
+	default_idle();
+}
+
+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));
+}
+
+EXPORT_SYMBOL(machine_restart);
+
+void machine_halt(void)
+{
+#if defined(CONFIG_SH_HS7751RVOIP)
+	unsigned short value;
+
+	value = ctrl_inw(PA_OUTPORTR);
+	ctrl_outw((value & 0xffdf), PA_OUTPORTR);
+#elif defined(CONFIG_SH_RTS7751R2D)
+	ctrl_outw(0x0001, PA_POWOFF);
+#endif
+	while (1)
+		cpu_sleep();
+}
+
+EXPORT_SYMBOL(machine_halt);
+
+void machine_power_off(void)
+{
+#if defined(CONFIG_SH_HS7751RVOIP)
+	unsigned short value;
+
+	value = ctrl_inw(PA_OUTPORTR);
+	ctrl_outw((value & 0xffdf), PA_OUTPORTR);
+#elif defined(CONFIG_SH_RTS7751R2D)
+	ctrl_outw(0x0001, PA_POWOFF);
+#endif
+}
+
+EXPORT_SYMBOL(machine_power_off);
+
+void show_regs(struct pt_regs * regs)
+{
+	printk("\n");
+	printk("Pid : %d, Comm: %20s\n", current->pid, current->comm);
+	print_symbol("PC is at %s\n", regs->pc);
+	printk("PC  : %08lx SP  : %08lx SR  : %08lx ",
+	       regs->pc, regs->regs[15], regs->sr);
+#ifdef CONFIG_MMU
+	printk("TEA : %08x    ", ctrl_inl(MMU_TEA));
+#else
+	printk("                  ");
+#endif
+	printk("%s\n", print_tainted());
+
+	printk("R0  : %08lx R1  : %08lx R2  : %08lx R3  : %08lx\n",
+	       regs->regs[0],regs->regs[1],
+	       regs->regs[2],regs->regs[3]);
+	printk("R4  : %08lx R5  : %08lx R6  : %08lx R7  : %08lx\n",
+	       regs->regs[4],regs->regs[5],
+	       regs->regs[6],regs->regs[7]);
+	printk("R8  : %08lx R9  : %08lx R10 : %08lx R11 : %08lx\n",
+	       regs->regs[8],regs->regs[9],
+	       regs->regs[10],regs->regs[11]);
+	printk("R12 : %08lx R13 : %08lx R14 : %08lx\n",
+	       regs->regs[12],regs->regs[13],
+	       regs->regs[14]);
+	printk("MACH: %08lx MACL: %08lx GBR : %08lx PR  : %08lx\n",
+	       regs->mach, regs->macl, regs->gbr, regs->pr);
+
+	/*
+	 * If we're in kernel mode, dump the stack too..
+	 */
+	if (!user_mode(regs)) {
+		extern void show_task(unsigned long *sp);
+		unsigned long sp = regs->regs[15];
+
+		show_task((unsigned long *)sp);
+	}
+}
+
+/*
+ * 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");
+
+int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
+{	/* Don't use this in BL=1(cli).  Or else, CPU resets! */
+	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);
+
+	/* 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)
+{
+	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;
+	struct pt_regs *regs = (struct pt_regs *)
+				((unsigned long)tsk->thread_info
+				 + THREAD_SIZE - sizeof(struct pt_regs)
+				 - sizeof(unsigned long));
+
+	/* Forget lazy FPU state */
+	clear_fpu(tsk, regs);
+	clear_used_math();
+#endif
+}
+
+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)
+{
+	int fpvalid = 0;
+
+#if defined(CONFIG_SH_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));
+	}
+#endif
+
+	return fpvalid;
+}
+
+/* 
+ * 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)
+{
+	struct pt_regs ptregs;
+	
+	ptregs = *(struct pt_regs *)
+		((unsigned long)tsk->thread_info + THREAD_SIZE
+		 - sizeof(struct pt_regs)
+#ifdef CONFIG_SH_DSP
+		 - sizeof(struct pt_dspregs)
+#endif
+		 - sizeof(unsigned long));
+	elf_core_copy_regs(regs, &ptregs);
+
+	return 1;
+}
+
+int
+dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *fpu)
+{
+	int fpvalid = 0;
+
+#if defined(CONFIG_SH_FPU)
+	fpvalid = !!tsk_used_math(tsk);
+	if (fpvalid) {
+		struct pt_regs *regs = (struct pt_regs *)
+					((unsigned long)tsk->thread_info
+					 + THREAD_SIZE - sizeof(struct pt_regs)
+					 - sizeof(unsigned long));
+		unlazy_fpu(tsk, regs);
+		memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu));
+	}
+#endif
+
+	return fpvalid;
+}
+
+asmlinkage void ret_from_fork(void);
+
+int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
+		unsigned long unused,
+		struct task_struct *p, struct pt_regs *regs)
+{
+	struct pt_regs *childregs;
+#if defined(CONFIG_SH_FPU)
+	struct task_struct *tsk = current;
+
+	unlazy_fpu(tsk, regs);
+	p->thread.fpu = tsk->thread.fpu;
+	copy_to_stopped_child_used_math(p);
+#endif
+
+	childregs = ((struct pt_regs *)
+		(THREAD_SIZE + (unsigned long) p->thread_info)
+#ifdef CONFIG_SH_DSP
+		- sizeof(struct pt_dspregs)
+#endif
+		- sizeof(unsigned long)) - 1;
+	*childregs = *regs;
+
+	if (user_mode(regs)) {
+		childregs->regs[15] = usp;
+	} else {
+		childregs->regs[15] = (unsigned long)p->thread_info + THREAD_SIZE;
+	}
+        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;
+}
+
+/*
+ * fill in the user structure for a core dump..
+ */
+void dump_thread(struct pt_regs * regs, struct user * dump)
+{
+	dump->magic = CMAGIC;
+	dump->start_code = current->mm->start_code;
+	dump->start_data  = current->mm->start_data;
+	dump->start_stack = regs->regs[15] & ~(PAGE_SIZE - 1);
+	dump->u_tsize = (current->mm->end_code - dump->start_code) >> PAGE_SHIFT;
+	dump->u_dsize = (current->mm->brk + (PAGE_SIZE-1) - dump->start_data) >> PAGE_SHIFT;
+	dump->u_ssize = (current->mm->start_stack - dump->start_stack +
+			 PAGE_SIZE - 1) >> PAGE_SHIFT;
+	/* Debug registers will come here. */
+
+	dump->regs = *regs;
+
+	dump->u_fpvalid = dump_fpu(regs, &dump->fpu);
+}
+
+/* Tracing by user break controller.  */
+static void
+ubc_set_tracing(int asid, unsigned long pc)
+{
+	ctrl_outl(pc, UBC_BARA);
+
+	/* We don't have any ASID settings for the SH-2! */
+	if (cpu_data->type != CPU_SH7604)
+		ctrl_outb(asid, UBC_BASRA);
+
+	ctrl_outl(0, UBC_BAMRA);
+
+	if (cpu_data->type == CPU_SH7729) {
+		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);
+	}
+}
+
+/*
+ *	switch_to(x,y) should switch tasks from x to y.
+ *
+ */
+struct task_struct *__switch_to(struct task_struct *prev, struct task_struct *next)
+{
+#if defined(CONFIG_SH_FPU)
+	struct pt_regs *regs = (struct pt_regs *)
+				((unsigned long)prev->thread_info
+				 + THREAD_SIZE - sizeof(struct pt_regs)
+				 - sizeof(unsigned long));
+	unlazy_fpu(prev, regs);
+#endif
+
+#ifdef CONFIG_PREEMPT
+	{
+		unsigned long flags;
+		struct pt_regs *regs;
+
+		local_irq_save(flags);
+		regs = (struct pt_regs *)
+			((unsigned long)prev->thread_info
+			 + THREAD_SIZE - sizeof(struct pt_regs)
+#ifdef CONFIG_SH_DSP
+			 - sizeof(struct pt_dspregs)
+#endif
+			 - sizeof(unsigned long));
+		if (user_mode(regs) && regs->regs[15] >= 0xc0000000) {
+			int offset = (int)regs->regs[15];
+
+			/* Reset stack pointer: clear critical region mark */
+			regs->regs[15] = regs->regs[1];
+			if (regs->pc < regs->regs[0])
+				/* Go to rewind point */
+				regs->pc = regs->regs[0] + offset;
+		}
+		local_irq_restore(flags);
+	}
+#endif
+
+	/*
+	 * Restore the kernel mode register
+	 *   	k7 (r7_bank1)
+	 */
+	asm volatile("ldc	%0, r7_bank"
+		     : /* no output */
+		     : "r" (next->thread_info));
+
+#ifdef CONFIG_MMU
+	/* 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) {
+		ubc_set_tracing(next->mm->context & MMU_CONTEXT_ASID_MASK,
+				next->thread.ubc_pc);
+	} else {
+		ctrl_outw(0, UBC_BBRA);
+		ctrl_outw(0, UBC_BBRB);
+	}
+#endif
+
+	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
+	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)
+{
+	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)
+{
+	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 *ufilename, char **uargv,
+			  char **uenvp, unsigned long r7,
+			  struct pt_regs regs)
+{
+	int error;
+	char *filename;
+
+	filename = getname((char __user *)ufilename);
+	error = PTR_ERR(filename);
+	if (IS_ERR(filename))
+		goto out;
+
+	error = do_execve(filename,
+			  (char __user * __user *)uargv,
+			  (char __user * __user *)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 schedule_frame;
+	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);
+	if (in_sched_functions(pc)) {
+		schedule_frame = ((unsigned long *)(long)p->thread.sp)[1];
+		return (unsigned long)((unsigned long *)schedule_frame)[1];
+	}
+	return pc;
+}
+
+asmlinkage void break_point_trap(unsigned long r4, unsigned long r5,
+				 unsigned long r6, unsigned long r7,
+				 struct pt_regs regs)
+{
+	/* Clear tracing.  */
+	ctrl_outw(0, UBC_BBRA);
+	ctrl_outw(0, UBC_BBRB);
+	current->thread.ubc_pc = 0;
+	ubc_usercnt -= 1;
+
+	force_sig(SIGTRAP, current);
+}
+
+asmlinkage void break_point_trap_software(unsigned long r4, unsigned long r5,
+					  unsigned long r6, unsigned long r7,
+					  struct pt_regs regs)
+{
+	regs.pc -= 2;
+	force_sig(SIGTRAP, current);
+}