You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
288 lines
6.1 KiB
288 lines
6.1 KiB
/*
|
|
* 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;
|
|
}
|
|
|