2012-02-08 21:18:46 -07:00
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/*
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* linux/arch/m68k/kernel/process.c
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*
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* Copyright (C) 1995 Hamish Macdonald
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*
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* 68060 fixes by Jesper Skov
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*/
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/*
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* This file handles the architecture-dependent parts of process handling..
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*/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/smp.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/reboot.h>
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#include <linux/init_task.h>
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#include <linux/mqueue.h>
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2012-08-22 09:27:34 -06:00
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#include <linux/rcupdate.h>
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2012-02-08 21:18:46 -07:00
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#include <asm/uaccess.h>
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#include <asm/traps.h>
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#include <asm/machdep.h>
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#include <asm/setup.h>
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#include <asm/pgtable.h>
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asmlinkage void ret_from_fork(void);
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2012-09-16 10:05:09 -06:00
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asmlinkage void ret_from_kernel_thread(void);
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2012-02-08 21:18:46 -07:00
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/*
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* Return saved PC from a blocked thread
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*/
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unsigned long thread_saved_pc(struct task_struct *tsk)
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{
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struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
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/* Check whether the thread is blocked in resume() */
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if (in_sched_functions(sw->retpc))
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return ((unsigned long *)sw->a6)[1];
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else
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return sw->retpc;
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}
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/*
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* The idle loop on an m68k..
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*/
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static void default_idle(void)
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{
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if (!need_resched())
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#if defined(MACH_ATARI_ONLY)
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/* block out HSYNC on the atari (falcon) */
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__asm__("stop #0x2200" : : : "cc");
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#else
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__asm__("stop #0x2000" : : : "cc");
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#endif
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}
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void (*idle)(void) = default_idle;
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/*
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* The idle thread. There's no useful work to be
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* done, so just try to conserve power and have a
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* low exit latency (ie sit in a loop waiting for
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* somebody to say that they'd like to reschedule)
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*/
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void cpu_idle(void)
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{
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/* endless idle loop with no priority at all */
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while (1) {
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2012-08-22 09:27:34 -06:00
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rcu_idle_enter();
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2012-02-08 21:18:46 -07:00
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while (!need_resched())
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idle();
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2012-08-22 09:27:34 -06:00
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rcu_idle_exit();
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2012-03-21 19:17:51 -06:00
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schedule_preempt_disabled();
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2012-02-08 21:18:46 -07:00
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}
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}
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void machine_restart(char * __unused)
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{
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if (mach_reset)
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mach_reset();
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for (;;);
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}
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void machine_halt(void)
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{
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if (mach_halt)
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mach_halt();
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for (;;);
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}
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void machine_power_off(void)
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{
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if (mach_power_off)
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mach_power_off();
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for (;;);
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}
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void (*pm_power_off)(void) = machine_power_off;
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EXPORT_SYMBOL(pm_power_off);
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void show_regs(struct pt_regs * regs)
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{
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printk("\n");
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printk("Format %02x Vector: %04x PC: %08lx Status: %04x %s\n",
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regs->format, regs->vector, regs->pc, regs->sr, print_tainted());
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printk("ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n",
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regs->orig_d0, regs->d0, regs->a2, regs->a1);
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printk("A0: %08lx D5: %08lx D4: %08lx\n",
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regs->a0, regs->d5, regs->d4);
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printk("D3: %08lx D2: %08lx D1: %08lx\n",
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regs->d3, regs->d2, regs->d1);
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if (!(regs->sr & PS_S))
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printk("USP: %08lx\n", rdusp());
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}
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void flush_thread(void)
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{
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current->thread.fs = __USER_DS;
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#ifdef CONFIG_FPU
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if (!FPU_IS_EMU) {
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unsigned long zero = 0;
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asm volatile("frestore %0": :"m" (zero));
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}
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#endif
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}
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/*
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* "m68k_fork()".. By the time we get here, the
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* non-volatile registers have also been saved on the
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* stack. We do some ugly pointer stuff here.. (see
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* also copy_thread)
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*/
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asmlinkage int m68k_fork(struct pt_regs *regs)
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{
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2011-03-21 21:39:27 -06:00
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#ifdef CONFIG_MMU
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2012-02-08 21:18:46 -07:00
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return do_fork(SIGCHLD, rdusp(), regs, 0, NULL, NULL);
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2005-04-16 16:20:36 -06:00
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#else
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2012-02-08 21:18:46 -07:00
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return -EINVAL;
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2005-04-16 16:20:36 -06:00
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#endif
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2012-02-08 21:18:46 -07:00
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}
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asmlinkage int m68k_vfork(struct pt_regs *regs)
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{
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return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0,
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NULL, NULL);
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}
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asmlinkage int m68k_clone(struct pt_regs *regs)
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{
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unsigned long clone_flags;
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unsigned long newsp;
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int __user *parent_tidptr, *child_tidptr;
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/* syscall2 puts clone_flags in d1 and usp in d2 */
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clone_flags = regs->d1;
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newsp = regs->d2;
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parent_tidptr = (int __user *)regs->d3;
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child_tidptr = (int __user *)regs->d4;
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if (!newsp)
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newsp = rdusp();
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return do_fork(clone_flags, newsp, regs, 0,
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parent_tidptr, child_tidptr);
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}
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int copy_thread(unsigned long clone_flags, unsigned long usp,
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2012-09-16 10:05:09 -06:00
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unsigned long arg,
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2012-02-08 21:18:46 -07:00
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struct task_struct * p, struct pt_regs * regs)
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{
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struct pt_regs * childregs;
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2012-09-16 10:05:09 -06:00
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struct switch_stack *childstack;
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2012-02-08 21:18:46 -07:00
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childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
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childstack = ((struct switch_stack *) childregs) - 1;
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p->thread.usp = usp;
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p->thread.ksp = (unsigned long)childstack;
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2012-09-16 10:05:09 -06:00
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p->thread.esp0 = (unsigned long)childregs;
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2012-02-08 21:18:46 -07:00
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/*
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* Must save the current SFC/DFC value, NOT the value when
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* the parent was last descheduled - RGH 10-08-96
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*/
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p->thread.fs = get_fs().seg;
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2012-09-16 10:05:09 -06:00
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if (unlikely(!regs)) {
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/* kernel thread */
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memset(childstack, 0,
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sizeof(struct switch_stack) + sizeof(struct pt_regs));
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childregs->sr = PS_S;
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childstack->a3 = usp; /* function */
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childstack->d7 = arg;
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childstack->retpc = (unsigned long)ret_from_kernel_thread;
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p->thread.usp = 0;
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return 0;
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}
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*childregs = *regs;
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childregs->d0 = 0;
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*childstack = ((struct switch_stack *) regs)[-1];
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childstack->retpc = (unsigned long)ret_from_fork;
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if (clone_flags & CLONE_SETTLS)
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task_thread_info(p)->tp_value = regs->d5;
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2012-02-08 21:18:46 -07:00
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#ifdef CONFIG_FPU
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if (!FPU_IS_EMU) {
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/* Copy the current fpu state */
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asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
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if (!CPU_IS_060 ? p->thread.fpstate[0] : p->thread.fpstate[2]) {
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if (CPU_IS_COLDFIRE) {
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asm volatile ("fmovemd %/fp0-%/fp7,%0\n\t"
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"fmovel %/fpiar,%1\n\t"
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"fmovel %/fpcr,%2\n\t"
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"fmovel %/fpsr,%3"
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:
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: "m" (p->thread.fp[0]),
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"m" (p->thread.fpcntl[0]),
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"m" (p->thread.fpcntl[1]),
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"m" (p->thread.fpcntl[2])
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: "memory");
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} else {
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asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
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"fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
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:
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: "m" (p->thread.fp[0]),
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"m" (p->thread.fpcntl[0])
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: "memory");
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}
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}
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/* Restore the state in case the fpu was busy */
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asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
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}
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#endif /* CONFIG_FPU */
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return 0;
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}
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/* Fill in the fpu structure for a core dump. */
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#ifdef CONFIG_FPU
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int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
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{
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char fpustate[216];
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if (FPU_IS_EMU) {
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int i;
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memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
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memcpy(fpu->fpregs, current->thread.fp, 96);
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/* Convert internal fpu reg representation
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* into long double format
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*/
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for (i = 0; i < 24; i += 3)
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fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
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((fpu->fpregs[i] & 0x0000ffff) << 16);
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return 1;
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}
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/* First dump the fpu context to avoid protocol violation. */
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asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
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if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
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return 0;
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if (CPU_IS_COLDFIRE) {
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asm volatile ("fmovel %/fpiar,%0\n\t"
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"fmovel %/fpcr,%1\n\t"
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"fmovel %/fpsr,%2\n\t"
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"fmovemd %/fp0-%/fp7,%3"
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:
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: "m" (fpu->fpcntl[0]),
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"m" (fpu->fpcntl[1]),
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"m" (fpu->fpcntl[2]),
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"m" (fpu->fpregs[0])
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: "memory");
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} else {
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asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
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:
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: "m" (fpu->fpcntl[0])
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: "memory");
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asm volatile ("fmovemx %/fp0-%/fp7,%0"
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:
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: "m" (fpu->fpregs[0])
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: "memory");
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}
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return 1;
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}
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EXPORT_SYMBOL(dump_fpu);
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#endif /* CONFIG_FPU */
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unsigned long get_wchan(struct task_struct *p)
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{
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unsigned long fp, pc;
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unsigned long stack_page;
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int count = 0;
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if (!p || p == current || p->state == TASK_RUNNING)
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return 0;
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stack_page = (unsigned long)task_stack_page(p);
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fp = ((struct switch_stack *)p->thread.ksp)->a6;
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do {
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if (fp < stack_page+sizeof(struct thread_info) ||
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fp >= 8184+stack_page)
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return 0;
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pc = ((unsigned long *)fp)[1];
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if (!in_sched_functions(pc))
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return pc;
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fp = *(unsigned long *) fp;
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} while (count++ < 16);
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return 0;
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}
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