/*
* 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");
}
void machine_halt(void)
{
local_irq_disable();
__asm__("sleep");
for (;;);
}
void machine_power_off(void)
{
local_irq_disable();
__asm__("sleep");
for (;;);
}
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;
}
