1 files changed, 377 insertions, 2 deletions

diff --git a/arch/m68k/kernel/process.c b/arch/m68k/kernel/process.c
index 6cf4bd6e34f8..f053e245bd40 100644
--- a/arch/m68k/kernel/process.c
+++ b/arch/m68k/kernel/process.c
@@ -1,5 +1,380 @@
+/*
+ *  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/errno.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/smp.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/reboot.h>
+#include <linux/init_task.h>
+#include <linux/mqueue.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/traps.h>
+#include <asm/machdep.h>
+#include <asm/setup.h>
+#include <asm/pgtable.h>
+
+
+asmlinkage void ret_from_fork(void);
+
+
+/*
+ * Return saved PC from a blocked thread
+ */
+unsigned long thread_saved_pc(struct task_struct *tsk)
+{
+        struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
+        /* Check whether the thread is blocked in resume() */
+        if (in_sched_functions(sw->retpc))
+                return ((unsigned long *)sw->a6)[1];
+        else
+                return sw->retpc;
+}
+
+/*
+ * The idle loop on an m68k..
+ */
+static void default_idle(void)
+{
+        if (!need_resched())
+#if defined(MACH_ATARI_ONLY)
+                /* block out HSYNC on the atari (falcon) */
+                __asm__("stop #0x2200" : : : "cc");
+#else
+                __asm__("stop #0x2000" : : : "cc");
+#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)
+{
+        /* endless idle loop with no priority at all */
+        while (1) {
+                while (!need_resched())
+                        idle();
+                preempt_enable_no_resched();
+                schedule();
+                preempt_disable();
+        }
+}
+
+void machine_restart(char * __unused)
+{
+        if (mach_reset)
+                mach_reset();
+        for (;;);
+}
+
+void machine_halt(void)
+{
+        if (mach_halt)
+                mach_halt();
+        for (;;);
+}
+
+void machine_power_off(void)
+{
+        if (mach_power_off)
+                mach_power_off();
+        for (;;);
+}
+
+void (*pm_power_off)(void) = machine_power_off;
+EXPORT_SYMBOL(pm_power_off);
+
+void show_regs(struct pt_regs * regs)
+{
+        printk("\n");
+        printk("Format %02x  Vector: %04x  PC: %08lx  Status: %04x    %s\n",
+               regs->format, regs->vector, regs->pc, regs->sr, print_tainted());
+        printk("ORIG_D0: %08lx  D0: %08lx  A2: %08lx  A1: %08lx\n",
+               regs->orig_d0, regs->d0, regs->a2, regs->a1);
+        printk("A0: %08lx  D5: %08lx  D4: %08lx\n",
+               regs->a0, regs->d5, regs->d4);
+        printk("D3: %08lx  D2: %08lx  D1: %08lx\n",
+               regs->d3, regs->d2, regs->d1);
+        if (!(regs->sr & PS_S))
+                printk("USP: %08lx\n", rdusp());
+}
+
+/*
+ * Create a kernel thread
+ */
+int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
+{
+        int pid;
+        mm_segment_t fs;
+
+        fs = get_fs();
+        set_fs (KERNEL_DS);
+
+        {
+        register long retval __asm__ ("d0");
+        register long clone_arg __asm__ ("d1") = flags | CLONE_VM | CLONE_UNTRACED;
+
+        retval = __NR_clone;
+        __asm__ __volatile__
+          ("clrl %%d2\n\t"
+           "trap #0\n\t"                /* Linux/m68k system call */
+           "tstl %0\n\t"                /* child or parent */
+           "jne 1f\n\t"                 /* parent - jump */
+#ifdef CONFIG_MMU
+           "lea %%sp@(%c7),%6\n\t"      /* reload current */
+           "movel %6@,%6\n\t"
+#endif
+           "movel %3,%%sp@-\n\t"        /* push argument */
+           "jsr %4@\n\t"                /* call fn */
+           "movel %0,%%d1\n\t"          /* pass exit value */
+           "movel %2,%%d0\n\t"          /* exit */
+           "trap #0\n"
+           "1:"
+           : "+d" (retval)
+           : "i" (__NR_clone), "i" (__NR_exit),
+             "r" (arg), "a" (fn), "d" (clone_arg), "r" (current),
+             "i" (-THREAD_SIZE)
+           : "d2");
+
+        pid = retval;
+        }
+
+        set_fs (fs);
+        return pid;
+}
+EXPORT_SYMBOL(kernel_thread);
+
+void flush_thread(void)
+{
+        current->thread.fs = __USER_DS;
+#ifdef CONFIG_FPU
+        if (!FPU_IS_EMU) {
+                unsigned long zero = 0;
+                asm volatile("frestore %0": :"m" (zero));
+        }
+#endif
+}
+
+/*
+ * "m68k_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 m68k_fork(struct pt_regs *regs)
+{
 #ifdef CONFIG_MMU
-#include "process_mm.c"
+        return do_fork(SIGCHLD, rdusp(), regs, 0, NULL, NULL);
 #else
-#include "process_no.c"
+        return -EINVAL;
 #endif
+}
+
+asmlinkage int m68k_vfork(struct pt_regs *regs)
+{
+        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0,
+                       NULL, NULL);
+}
+
+asmlinkage int m68k_clone(struct pt_regs *regs)
+{
+        unsigned long clone_flags;
+        unsigned long newsp;
+        int __user *parent_tidptr, *child_tidptr;
+
+        /* syscall2 puts clone_flags in d1 and usp in d2 */
+        clone_flags = regs->d1;
+        newsp = regs->d2;
+        parent_tidptr = (int __user *)regs->d3;
+        child_tidptr = (int __user *)regs->d4;
+        if (!newsp)
+                newsp = rdusp();
+        return do_fork(clone_flags, newsp, regs, 0,
+                       parent_tidptr, child_tidptr);
+}
+
+int copy_thread(unsigned long clone_flags, unsigned long usp,
+                 unsigned long unused,
+                 struct task_struct * p, struct pt_regs * regs)
+{
+        struct pt_regs * childregs;
+        struct switch_stack * childstack, *stack;
+        unsigned long *retp;
+
+        childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
+
+        *childregs = *regs;
+        childregs->d0 = 0;
+
+        retp = ((unsigned long *) regs);
+        stack = ((struct switch_stack *) retp) - 1;
+
+        childstack = ((struct switch_stack *) childregs) - 1;
+        *childstack = *stack;
+        childstack->retpc = (unsigned long)ret_from_fork;
+
+        p->thread.usp = usp;
+        p->thread.ksp = (unsigned long)childstack;
+
+        if (clone_flags & CLONE_SETTLS)
+                task_thread_info(p)->tp_value = regs->d5;
+
+        /*
+         * Must save the current SFC/DFC value, NOT the value when
+         * the parent was last descheduled - RGH  10-08-96
+         */
+        p->thread.fs = get_fs().seg;
+
+#ifdef CONFIG_FPU
+        if (!FPU_IS_EMU) {
+                /* Copy the current fpu state */
+                asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
+
+                if (!CPU_IS_060 ? p->thread.fpstate[0] : p->thread.fpstate[2]) {
+                        if (CPU_IS_COLDFIRE) {
+                                asm volatile ("fmovemd %/fp0-%/fp7,%0\n\t"
+                                              "fmovel %/fpiar,%1\n\t"
+                                              "fmovel %/fpcr,%2\n\t"
+                                              "fmovel %/fpsr,%3"
+                                              :
+                                              : "m" (p->thread.fp[0]),
+                                                "m" (p->thread.fpcntl[0]),
+                                                "m" (p->thread.fpcntl[1]),
+                                                "m" (p->thread.fpcntl[2])
+                                              : "memory");
+                        } else {
+                                asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
+                                              "fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
+                                              :
+                                              : "m" (p->thread.fp[0]),
+                                                "m" (p->thread.fpcntl[0])
+                                              : "memory");
+                        }
+                }
+
+                /* Restore the state in case the fpu was busy */
+                asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
+        }
+#endif /* CONFIG_FPU */
+
+        return 0;
+}
+
+/* Fill in the fpu structure for a core dump.  */
+#ifdef CONFIG_FPU
+int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
+{
+        char fpustate[216];
+
+        if (FPU_IS_EMU) {
+                int i;
+
+                memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
+                memcpy(fpu->fpregs, current->thread.fp, 96);
+                /* Convert internal fpu reg representation
+                 * into long double format
+                 */
+                for (i = 0; i < 24; i += 3)
+                        fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
+                                         ((fpu->fpregs[i] & 0x0000ffff) << 16);
+                return 1;
+        }
+
+        /* First dump the fpu context to avoid protocol violation.  */
+        asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
+        if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
+                return 0;
+
+        if (CPU_IS_COLDFIRE) {
+                asm volatile ("fmovel %/fpiar,%0\n\t"
+                              "fmovel %/fpcr,%1\n\t"
+                              "fmovel %/fpsr,%2\n\t"
+                              "fmovemd %/fp0-%/fp7,%3"
+                              :
+                              : "m" (fpu->fpcntl[0]),
+                                "m" (fpu->fpcntl[1]),
+                                "m" (fpu->fpcntl[2]),
+                                "m" (fpu->fpregs[0])
+                              : "memory");
+        } else {
+                asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
+                              :
+                              : "m" (fpu->fpcntl[0])
+                              : "memory");
+                asm volatile ("fmovemx %/fp0-%/fp7,%0"
+                              :
+                              : "m" (fpu->fpregs[0])
+                              : "memory");
+        }
+
+        return 1;
+}
+EXPORT_SYMBOL(dump_fpu);
+#endif /* CONFIG_FPU */
+
+/*
+ * sys_execve() executes a new program.
+ */
+asmlinkage int sys_execve(const char __user *name,
+                          const char __user *const __user *argv,
+                          const char __user *const __user *envp)
+{
+        int error;
+        char * filename;
+        struct pt_regs *regs = (struct pt_regs *) &name;
+
+        filename = getname(name);
+        error = PTR_ERR(filename);
+        if (IS_ERR(filename))
+                return error;
+        error = do_execve(filename, argv, envp, regs);
+        putname(filename);
+        return error;
+}
+
+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)task_stack_page(p);
+        fp = ((struct switch_stack *)p->thread.ksp)->a6;
+        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;
+}