diff options
Diffstat (limited to 'arch/m68k/kernel/process_no.c')
| -rw-r--r-- | arch/m68k/kernel/process_no.c | 404 |
1 files changed, 404 insertions, 0 deletions
diff --git a/arch/m68k/kernel/process_no.c b/arch/m68k/kernel/process_no.c new file mode 100644 index 000000000000..e2a63af5d517 --- /dev/null +++ b/arch/m68k/kernel/process_no.c @@ -0,0 +1,404 @@ +/* + * linux/arch/m68knommu/kernel/process.c + * + * Copyright (C) 1995 Hamish Macdonald + * + * 68060 fixes by Jesper Skov + * + * uClinux changes + * Copyright (C) 2000-2002, David McCullough <davidm@snapgear.com> + */ + +/* + * This file handles the architecture-dependent parts of process handling.. + */ + +#include <linux/module.h> +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/stddef.h> +#include <linux/unistd.h> +#include <linux/ptrace.h> +#include <linux/user.h> +#include <linux/interrupt.h> +#include <linux/reboot.h> +#include <linux/fs.h> +#include <linux/slab.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); + +/* + * The following aren't currently used. + */ +void (*pm_idle)(void); +EXPORT_SYMBOL(pm_idle); + +void (*pm_power_off)(void); +EXPORT_SYMBOL(pm_power_off); + +/* + * The idle loop on an m68knommu.. + */ +static void default_idle(void) +{ + local_irq_disable(); + while (!need_resched()) { + /* This stop will re-enable interrupts */ + __asm__("stop #0x2000" : : : "cc"); + local_irq_disable(); + } + local_irq_enable(); +} + +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) { + 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 show_regs(struct pt_regs * regs) +{ + printk(KERN_NOTICE "\n"); + printk(KERN_NOTICE "Format %02x Vector: %04x PC: %08lx Status: %04x %s\n", + regs->format, regs->vector, regs->pc, regs->sr, print_tainted()); + printk(KERN_NOTICE "ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n", + regs->orig_d0, regs->d0, regs->a2, regs->a1); + printk(KERN_NOTICE "A0: %08lx D5: %08lx D4: %08lx\n", + regs->a0, regs->d5, regs->d4); + printk(KERN_NOTICE "D3: %08lx D2: %08lx D1: %08lx\n", + regs->d3, regs->d2, regs->d1); + if (!(regs->sr & PS_S)) + printk(KERN_NOTICE "USP: %08lx\n", rdusp()); +} + +/* + * Create a kernel thread + */ +int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) +{ + int retval; + long clone_arg = flags | CLONE_VM; + mm_segment_t fs; + + fs = get_fs(); + set_fs(KERNEL_DS); + + __asm__ __volatile__ ( + "movel %%sp, %%d2\n\t" + "movel %5, %%d1\n\t" + "movel %1, %%d0\n\t" + "trap #0\n\t" + "cmpl %%sp, %%d2\n\t" + "jeq 1f\n\t" + "movel %3, %%sp@-\n\t" + "jsr %4@\n\t" + "movel %2, %%d0\n\t" + "trap #0\n" + "1:\n\t" + "movel %%d0, %0\n" + : "=d" (retval) + : "i" (__NR_clone), + "i" (__NR_exit), + "a" (arg), + "a" (fn), + "a" (clone_arg) + : "cc", "%d0", "%d1", "%d2"); + + set_fs(fs); + return retval; +} + +void flush_thread(void) +{ +#ifdef CONFIG_FPU + unsigned long zero = 0; +#endif + set_fs(USER_DS); + current->thread.fs = __USER_DS; +#ifdef CONFIG_FPU + if (!FPU_IS_EMU) + asm volatile (".chip 68k/68881\n\t" + "frestore %0@\n\t" + ".chip 68k" : : "a" (&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) +{ + /* fork almost works, enough to trick you into looking elsewhere :-( */ + return(-EINVAL); +} + +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; + + /* syscall2 puts clone_flags in d1 and usp in d2 */ + clone_flags = regs->d1; + newsp = regs->d2; + if (!newsp) + newsp = rdusp(); + return do_fork(clone_flags, newsp, regs, 0, NULL, NULL); +} + +int copy_thread(unsigned long clone_flags, + unsigned long usp, unsigned long topstk, + 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 (p->thread.fpstate[0]) + 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 + + return 0; +} + +/* Fill in the fpu structure for a core dump. */ + +int dump_fpu(struct pt_regs *regs, struct user_m68kfp_struct *fpu) +{ +#ifdef CONFIG_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 (!fpustate[0]) + return 0; + + asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0" + :: "m" (fpu->fpcntl[0]) + : "memory"); + asm volatile ("fmovemx %/fp0-%/fp7,%0" + :: "m" (fpu->fpregs[0]) + : "memory"); +#endif + return 1; +} + +/* + * Generic dumping code. Used for panic and debug. + */ +void dump(struct pt_regs *fp) +{ + unsigned long *sp; + unsigned char *tp; + int i; + + printk(KERN_EMERG "\nCURRENT PROCESS:\n\n"); + printk(KERN_EMERG "COMM=%s PID=%d\n", current->comm, current->pid); + + if (current->mm) { + printk(KERN_EMERG "TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n", + (int) current->mm->start_code, + (int) current->mm->end_code, + (int) current->mm->start_data, + (int) current->mm->end_data, + (int) current->mm->end_data, + (int) current->mm->brk); + printk(KERN_EMERG "USER-STACK=%08x KERNEL-STACK=%08x\n\n", + (int) current->mm->start_stack, + (int)(((unsigned long) current) + THREAD_SIZE)); + } + + printk(KERN_EMERG "PC: %08lx\n", fp->pc); + printk(KERN_EMERG "SR: %08lx SP: %08lx\n", (long) fp->sr, (long) fp); + printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n", + fp->d0, fp->d1, fp->d2, fp->d3); + printk(KERN_EMERG "d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n", + fp->d4, fp->d5, fp->a0, fp->a1); + printk(KERN_EMERG "\nUSP: %08x TRAPFRAME: %p\n", + (unsigned int) rdusp(), fp); + + printk(KERN_EMERG "\nCODE:"); + tp = ((unsigned char *) fp->pc) - 0x20; + for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) { + if ((i % 0x10) == 0) + printk(KERN_EMERG "%p: ", tp + i); + printk("%08x ", (int) *sp++); + } + printk(KERN_EMERG "\n"); + + printk(KERN_EMERG "KERNEL STACK:"); + tp = ((unsigned char *) fp) - 0x40; + for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) { + if ((i % 0x10) == 0) + printk(KERN_EMERG "%p: ", tp + i); + printk("%08x ", (int) *sp++); + } + printk(KERN_EMERG "\n"); + + printk(KERN_EMERG "USER STACK:"); + tp = (unsigned char *) (rdusp() - 0x10); + for (sp = (unsigned long *) tp, i = 0; (i < 0x80); i += 4) { + if ((i % 0x10) == 0) + printk(KERN_EMERG "%p: ", tp + i); + printk("%08x ", (int) *sp++); + } + printk(KERN_EMERG "\n"); +} + +/* + * sys_execve() executes a new program. + */ +asmlinkage int sys_execve(const char *name, + const char *const *argv, + const char *const *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)p; + fp = ((struct switch_stack *)p->thread.ksp)->a6; + do { + if (fp < stack_page+sizeof(struct thread_info) || + fp >= THREAD_SIZE-8+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; +} + +/* + * Return saved PC of 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; +} + |