1 files changed, 288 insertions, 0 deletions

diff --git a/arch/h8300/kernel/process.c b/arch/h8300/kernel/process.c
new file mode 100644
index 000000000000..134aec1c6d19
--- /dev/null
+++ b/arch/h8300/kernel/process.c
@@ -0,0 +1,288 @@
+/*
+ *  linux/arch/h8300/kernel/process.c
+ *
+ * Yoshinori Sato <ysato@users.sourceforge.jp>
+ *
+ *  Based on:
+ *
+ *  linux/arch/m68knommu/kernel/process.c
+ *
+ *  Copyright (C) 1998  D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
+ *                      Kenneth Albanowski <kjahds@kjahds.com>,
+ *                      The Silver Hammer Group, Ltd.
+ *
+ *  linux/arch/m68k/kernel/process.c
+ *
+ *  Copyright (C) 1995  Hamish Macdonald
+ *
+ *  68060 fixes by Jesper Skov
+ */
+
+/*
+ * This file handles the architecture-dependent parts of process handling..
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/user.h>
+#include <linux/a.out.h>
+#include <linux/interrupt.h>
+#include <linux/reboot.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/traps.h>
+#include <asm/setup.h>
+#include <asm/pgtable.h>
+
+asmlinkage void ret_from_fork(void);
+
+/*
+ * The idle loop on an H8/300..
+ */
+#if !defined(CONFIG_H8300H_SIM) && !defined(CONFIG_H8S_SIM)
+void default_idle(void)
+{
+        while(1) {
+                if (need_resched()) {
+                        local_irq_enable();
+                        __asm__("sleep");
+                        local_irq_disable();
+                }
+                schedule();
+        }
+}
+#else
+void default_idle(void)
+{
+        while(1) {
+                if (need_resched())
+                        schedule();
+        }
+}
+#endif
+void (*idle)(void) = default_idle;
+
+/*
+ * 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)
+{
+        idle();
+}
+
+void machine_restart(char * __unused)
+{
+        local_irq_disable();
+        __asm__("jmp @@0"); 
+}
+
+EXPORT_SYMBOL(machine_restart);
+
+void machine_halt(void)
+{
+        local_irq_disable();
+        __asm__("sleep");
+        for (;;);
+}
+
+EXPORT_SYMBOL(machine_halt);
+
+void machine_power_off(void)
+{
+        local_irq_disable();
+        __asm__("sleep");
+        for (;;);
+}
+
+EXPORT_SYMBOL(machine_power_off);
+
+void show_regs(struct pt_regs * regs)
+{
+        printk("\nPC: %08lx  Status: %02x",
+               regs->pc, regs->ccr);
+        printk("\nORIG_ER0: %08lx ER0: %08lx ER1: %08lx",
+               regs->orig_er0, regs->er0, regs->er1);
+        printk("\nER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx",
+               regs->er2, regs->er3, regs->er4, regs->er5);
+        printk("\nER6' %08lx ",regs->er6);
+        if (user_mode(regs))
+                printk("USP: %08lx\n", rdusp());
+        else
+                printk("\n");
+}
+
+/*
+ * Create a kernel thread
+ */
+int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
+{
+        long retval;
+        long clone_arg;
+        mm_segment_t fs;
+
+        fs = get_fs();
+        set_fs (KERNEL_DS);
+        clone_arg = flags | CLONE_VM;
+        __asm__("mov.l sp,er3\n\t"
+                "sub.l er2,er2\n\t"
+                "mov.l %2,er1\n\t"
+                "mov.l %1,er0\n\t"
+                "trapa #0\n\t"
+                "cmp.l sp,er3\n\t"
+                "beq 1f\n\t"
+                "mov.l %4,er0\n\t"
+                "mov.l %3,er1\n\t"
+                "jsr @er1\n\t"
+                "mov.l %5,er0\n\t"
+                "trapa #0\n"
+                "1:\n\t"
+                "mov.l er0,%0"
+                :"=r"(retval)
+                :"i"(__NR_clone),"g"(clone_arg),"g"(fn),"g"(arg),"i"(__NR_exit)
+                :"er0","er1","er2","er3");
+        set_fs (fs);
+        return retval;
+}
+
+void flush_thread(void)
+{
+}
+
+/*
+ * "h8300_fork()".. By the time we get here, the
+ * non-volatile registers have also been saved on the
+ * stack. We do some ugly pointer stuff here.. (see
+ * also copy_thread)
+ */
+
+asmlinkage int h8300_fork(struct pt_regs *regs)
+{
+        return -EINVAL;
+}
+
+asmlinkage int h8300_vfork(struct pt_regs *regs)
+{
+        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL);
+}
+
+asmlinkage int h8300_clone(struct pt_regs *regs)
+{
+        unsigned long clone_flags;
+        unsigned long newsp;
+
+        /* syscall2 puts clone_flags in er1 and usp in er2 */
+        clone_flags = regs->er1;
+        newsp = regs->er2;
+        if (!newsp)
+                newsp  = rdusp();
+        return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
+
+}
+
+int copy_thread(int nr, unsigned long clone_flags,
+                unsigned long usp, unsigned long topstk,
+                 struct task_struct * p, struct pt_regs * regs)
+{
+        struct pt_regs * childregs;
+
+        childregs = ((struct pt_regs *) (THREAD_SIZE + (unsigned long) p->thread_info)) - 1;
+
+        *childregs = *regs;
+        childregs->retpc = (unsigned long) ret_from_fork;
+        childregs->er0 = 0;
+
+        p->thread.usp = usp;
+        p->thread.ksp = (unsigned long)childregs;
+
+        return 0;
+}
+
+/*
+ * fill in the user structure for a core dump..
+ */
+void dump_thread(struct pt_regs * regs, struct user * dump)
+{
+/* changed the size calculations - should hopefully work better. lbt */
+        dump->magic = CMAGIC;
+        dump->start_code = 0;
+        dump->start_stack = rdusp() & ~(PAGE_SIZE - 1);
+        dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
+        dump->u_dsize = ((unsigned long) (current->mm->brk +
+                                          (PAGE_SIZE-1))) >> PAGE_SHIFT;
+        dump->u_dsize -= dump->u_tsize;
+        dump->u_ssize = 0;
+
+        dump->u_ar0 = (struct user_regs_struct *)(((int)(&dump->regs)) -((int)(dump)));
+        dump->regs.er0 = regs->er0;
+        dump->regs.er1 = regs->er1;
+        dump->regs.er2 = regs->er2;
+        dump->regs.er3 = regs->er3;
+        dump->regs.er4 = regs->er4;
+        dump->regs.er5 = regs->er5;
+        dump->regs.er6 = regs->er6;
+        dump->regs.orig_er0 = regs->orig_er0;
+        dump->regs.ccr = regs->ccr;
+        dump->regs.pc  = regs->pc;
+}
+
+/*
+ * sys_execve() executes a new program.
+ */
+asmlinkage int sys_execve(char *name, char **argv, char **envp,int dummy,...)
+{
+        int error;
+        char * filename;
+        struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
+
+        lock_kernel();
+        filename = getname(name);
+        error = PTR_ERR(filename);
+        if (IS_ERR(filename))
+                goto out;
+        error = do_execve(filename, argv, envp, regs);
+        putname(filename);
+out:
+        unlock_kernel();
+        return error;
+}
+
+unsigned long thread_saved_pc(struct task_struct *tsk)
+{
+        return ((struct pt_regs *)tsk->thread.esp0)->pc;
+}
+
+unsigned long get_wchan(struct task_struct *p)
+{
+        unsigned long fp, pc;
+        unsigned long stack_page;
+        int count = 0;
+        if (!p || p == current || p->state == TASK_RUNNING)
+                return 0;
+
+        stack_page = (unsigned long)p;
+        fp = ((struct pt_regs *)p->thread.ksp)->er6;
+        do {
+                if (fp < stack_page+sizeof(struct thread_info) ||
+                    fp >= 8184+stack_page)
+                        return 0;
+                pc = ((unsigned long *)fp)[1];
+                if (!in_sched_functions(pc))
+                        return pc;
+                fp = *(unsigned long *) fp;
+        } while (count++ < 16);
+        return 0;
+}