diff options
Diffstat (limited to 'arch/h8300/kernel/process.c')
| -rw-r--r-- | arch/h8300/kernel/process.c | 288 |
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; +} |