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![Arnd Bergmann](/assets/img/avatar_default.png)
The big kernel lock has been removed from all these files at some point, leaving only the #include. Remove this too as a cleanup. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
404 lines
9.3 KiB
C
404 lines
9.3 KiB
C
/*
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* linux/arch/m68knommu/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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* uClinux changes
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* Copyright (C) 2000-2002, David McCullough <davidm@snapgear.com>
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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/module.h>
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#include <linux/errno.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/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/interrupt.h>
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#include <linux/reboot.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <asm/uaccess.h>
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#include <asm/system.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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/*
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* The following aren't currently used.
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*/
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void (*pm_idle)(void);
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EXPORT_SYMBOL(pm_idle);
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void (*pm_power_off)(void);
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EXPORT_SYMBOL(pm_power_off);
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/*
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* The idle loop on an m68knommu..
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*/
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static void default_idle(void)
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{
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local_irq_disable();
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while (!need_resched()) {
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/* This stop will re-enable interrupts */
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__asm__("stop #0x2000" : : : "cc");
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local_irq_disable();
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}
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local_irq_enable();
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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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idle();
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preempt_enable_no_resched();
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schedule();
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preempt_disable();
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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 show_regs(struct pt_regs * regs)
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{
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printk(KERN_NOTICE "\n");
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printk(KERN_NOTICE "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(KERN_NOTICE "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(KERN_NOTICE "A0: %08lx D5: %08lx D4: %08lx\n",
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regs->a0, regs->d5, regs->d4);
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printk(KERN_NOTICE "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(KERN_NOTICE "USP: %08lx\n", rdusp());
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}
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/*
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* Create a kernel thread
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*/
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int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
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{
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int retval;
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long clone_arg = flags | CLONE_VM;
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mm_segment_t fs;
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fs = get_fs();
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set_fs(KERNEL_DS);
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__asm__ __volatile__ (
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"movel %%sp, %%d2\n\t"
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"movel %5, %%d1\n\t"
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"movel %1, %%d0\n\t"
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"trap #0\n\t"
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"cmpl %%sp, %%d2\n\t"
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"jeq 1f\n\t"
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"movel %3, %%sp@-\n\t"
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"jsr %4@\n\t"
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"movel %2, %%d0\n\t"
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"trap #0\n"
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"1:\n\t"
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"movel %%d0, %0\n"
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: "=d" (retval)
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: "i" (__NR_clone),
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"i" (__NR_exit),
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"a" (arg),
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"a" (fn),
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"a" (clone_arg)
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: "cc", "%d0", "%d1", "%d2");
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set_fs(fs);
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return retval;
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}
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void flush_thread(void)
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{
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#ifdef CONFIG_FPU
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unsigned long zero = 0;
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#endif
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set_fs(USER_DS);
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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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asm volatile (".chip 68k/68881\n\t"
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"frestore %0@\n\t"
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".chip 68k" : : "a" (&zero));
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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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/* fork almost works, enough to trick you into looking elsewhere :-( */
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return(-EINVAL);
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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, 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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/* 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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if (!newsp)
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newsp = rdusp();
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return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
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}
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int copy_thread(unsigned long clone_flags,
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unsigned long usp, unsigned long topstk,
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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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struct switch_stack * childstack, *stack;
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unsigned long *retp;
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childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
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*childregs = *regs;
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childregs->d0 = 0;
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retp = ((unsigned long *) regs);
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stack = ((struct switch_stack *) retp) - 1;
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childstack = ((struct switch_stack *) childregs) - 1;
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*childstack = *stack;
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childstack->retpc = (unsigned long)ret_from_fork;
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p->thread.usp = usp;
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p->thread.ksp = (unsigned long)childstack;
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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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/*
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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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#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 (p->thread.fpstate[0])
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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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: : "m" (p->thread.fp[0]), "m" (p->thread.fpcntl[0])
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: "memory");
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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
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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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int dump_fpu(struct pt_regs *regs, struct user_m68kfp_struct *fpu)
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{
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#ifdef CONFIG_FPU
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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 (!fpustate[0])
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return 0;
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asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
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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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:: "m" (fpu->fpregs[0])
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: "memory");
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#endif
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return 1;
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}
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/*
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* Generic dumping code. Used for panic and debug.
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*/
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void dump(struct pt_regs *fp)
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{
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unsigned long *sp;
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unsigned char *tp;
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int i;
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printk(KERN_EMERG "\nCURRENT PROCESS:\n\n");
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printk(KERN_EMERG "COMM=%s PID=%d\n", current->comm, current->pid);
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if (current->mm) {
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printk(KERN_EMERG "TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
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(int) current->mm->start_code,
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(int) current->mm->end_code,
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(int) current->mm->start_data,
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(int) current->mm->end_data,
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(int) current->mm->end_data,
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(int) current->mm->brk);
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printk(KERN_EMERG "USER-STACK=%08x KERNEL-STACK=%08x\n\n",
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(int) current->mm->start_stack,
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(int)(((unsigned long) current) + THREAD_SIZE));
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}
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printk(KERN_EMERG "PC: %08lx\n", fp->pc);
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printk(KERN_EMERG "SR: %08lx SP: %08lx\n", (long) fp->sr, (long) fp);
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printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
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fp->d0, fp->d1, fp->d2, fp->d3);
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printk(KERN_EMERG "d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n",
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fp->d4, fp->d5, fp->a0, fp->a1);
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printk(KERN_EMERG "\nUSP: %08x TRAPFRAME: %p\n",
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(unsigned int) rdusp(), fp);
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printk(KERN_EMERG "\nCODE:");
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tp = ((unsigned char *) fp->pc) - 0x20;
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for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) {
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if ((i % 0x10) == 0)
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printk(KERN_EMERG "%p: ", tp + i);
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printk("%08x ", (int) *sp++);
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}
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printk(KERN_EMERG "\n");
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printk(KERN_EMERG "KERNEL STACK:");
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tp = ((unsigned char *) fp) - 0x40;
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for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
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if ((i % 0x10) == 0)
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printk(KERN_EMERG "%p: ", tp + i);
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printk("%08x ", (int) *sp++);
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}
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printk(KERN_EMERG "\n");
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printk(KERN_EMERG "USER STACK:");
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tp = (unsigned char *) (rdusp() - 0x10);
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for (sp = (unsigned long *) tp, i = 0; (i < 0x80); i += 4) {
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if ((i % 0x10) == 0)
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printk(KERN_EMERG "%p: ", tp + i);
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printk("%08x ", (int) *sp++);
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}
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printk(KERN_EMERG "\n");
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}
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/*
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* sys_execve() executes a new program.
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*/
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asmlinkage int sys_execve(const char *name,
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const char *const *argv,
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const char *const *envp)
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{
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int error;
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char * filename;
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struct pt_regs *regs = (struct pt_regs *) &name;
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filename = getname(name);
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error = PTR_ERR(filename);
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if (IS_ERR(filename))
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return error;
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error = do_execve(filename, argv, envp, regs);
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putname(filename);
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return error;
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}
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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)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 >= THREAD_SIZE-8+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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/*
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* Return saved PC of 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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