forked from Minki/linux
59586e5a26
machine_restart, machine_halt and machine_power_off are machine specific hooks deep into the reboot logic, that modules have no business messing with. Usually code should be calling kernel_restart, kernel_halt, kernel_power_off, or emergency_restart. So don't export machine_restart, machine_halt, and machine_power_off so we can catch buggy users. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
526 lines
12 KiB
C
526 lines
12 KiB
C
/* $Id: process.c,v 1.28 2004/05/05 16:54:23 lethal Exp $
|
|
*
|
|
* linux/arch/sh/kernel/process.c
|
|
*
|
|
* Copyright (C) 1995 Linus Torvalds
|
|
*
|
|
* SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
|
|
*/
|
|
|
|
/*
|
|
* This file handles the architecture-dependent parts of process handling..
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/unistd.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/elfcore.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/a.out.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/platform.h>
|
|
#include <linux/kallsyms.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/elf.h>
|
|
#if defined(CONFIG_SH_HS7751RVOIP)
|
|
#include <asm/hs7751rvoip/hs7751rvoip.h>
|
|
#elif defined(CONFIG_SH_RTS7751R2D)
|
|
#include <asm/rts7751r2d/rts7751r2d.h>
|
|
#endif
|
|
|
|
static int hlt_counter=0;
|
|
|
|
int ubc_usercnt = 0;
|
|
|
|
#define HARD_IDLE_TIMEOUT (HZ / 3)
|
|
|
|
void disable_hlt(void)
|
|
{
|
|
hlt_counter++;
|
|
}
|
|
|
|
EXPORT_SYMBOL(disable_hlt);
|
|
|
|
void enable_hlt(void)
|
|
{
|
|
hlt_counter--;
|
|
}
|
|
|
|
EXPORT_SYMBOL(enable_hlt);
|
|
|
|
void default_idle(void)
|
|
{
|
|
/* endless idle loop with no priority at all */
|
|
while (1) {
|
|
if (hlt_counter) {
|
|
while (1)
|
|
if (need_resched())
|
|
break;
|
|
} else {
|
|
while (!need_resched())
|
|
cpu_sleep();
|
|
}
|
|
|
|
schedule();
|
|
}
|
|
}
|
|
|
|
void cpu_idle(void)
|
|
{
|
|
default_idle();
|
|
}
|
|
|
|
void machine_restart(char * __unused)
|
|
{
|
|
/* SR.BL=1 and invoke address error to let CPU reset (manual reset) */
|
|
asm volatile("ldc %0, sr\n\t"
|
|
"mov.l @%1, %0" : : "r" (0x10000000), "r" (0x80000001));
|
|
}
|
|
|
|
void machine_halt(void)
|
|
{
|
|
#if defined(CONFIG_SH_HS7751RVOIP)
|
|
unsigned short value;
|
|
|
|
value = ctrl_inw(PA_OUTPORTR);
|
|
ctrl_outw((value & 0xffdf), PA_OUTPORTR);
|
|
#elif defined(CONFIG_SH_RTS7751R2D)
|
|
ctrl_outw(0x0001, PA_POWOFF);
|
|
#endif
|
|
while (1)
|
|
cpu_sleep();
|
|
}
|
|
|
|
void machine_power_off(void)
|
|
{
|
|
#if defined(CONFIG_SH_HS7751RVOIP)
|
|
unsigned short value;
|
|
|
|
value = ctrl_inw(PA_OUTPORTR);
|
|
ctrl_outw((value & 0xffdf), PA_OUTPORTR);
|
|
#elif defined(CONFIG_SH_RTS7751R2D)
|
|
ctrl_outw(0x0001, PA_POWOFF);
|
|
#endif
|
|
}
|
|
|
|
void show_regs(struct pt_regs * regs)
|
|
{
|
|
printk("\n");
|
|
printk("Pid : %d, Comm: %20s\n", current->pid, current->comm);
|
|
print_symbol("PC is at %s\n", regs->pc);
|
|
printk("PC : %08lx SP : %08lx SR : %08lx ",
|
|
regs->pc, regs->regs[15], regs->sr);
|
|
#ifdef CONFIG_MMU
|
|
printk("TEA : %08x ", ctrl_inl(MMU_TEA));
|
|
#else
|
|
printk(" ");
|
|
#endif
|
|
printk("%s\n", print_tainted());
|
|
|
|
printk("R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n",
|
|
regs->regs[0],regs->regs[1],
|
|
regs->regs[2],regs->regs[3]);
|
|
printk("R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n",
|
|
regs->regs[4],regs->regs[5],
|
|
regs->regs[6],regs->regs[7]);
|
|
printk("R8 : %08lx R9 : %08lx R10 : %08lx R11 : %08lx\n",
|
|
regs->regs[8],regs->regs[9],
|
|
regs->regs[10],regs->regs[11]);
|
|
printk("R12 : %08lx R13 : %08lx R14 : %08lx\n",
|
|
regs->regs[12],regs->regs[13],
|
|
regs->regs[14]);
|
|
printk("MACH: %08lx MACL: %08lx GBR : %08lx PR : %08lx\n",
|
|
regs->mach, regs->macl, regs->gbr, regs->pr);
|
|
|
|
/*
|
|
* If we're in kernel mode, dump the stack too..
|
|
*/
|
|
if (!user_mode(regs)) {
|
|
extern void show_task(unsigned long *sp);
|
|
unsigned long sp = regs->regs[15];
|
|
|
|
show_task((unsigned long *)sp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Create a kernel thread
|
|
*/
|
|
|
|
/*
|
|
* This is the mechanism for creating a new kernel thread.
|
|
*
|
|
*/
|
|
extern void kernel_thread_helper(void);
|
|
__asm__(".align 5\n"
|
|
"kernel_thread_helper:\n\t"
|
|
"jsr @r5\n\t"
|
|
" nop\n\t"
|
|
"mov.l 1f, r1\n\t"
|
|
"jsr @r1\n\t"
|
|
" mov r0, r4\n\t"
|
|
".align 2\n\t"
|
|
"1:.long do_exit");
|
|
|
|
int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
|
|
{ /* Don't use this in BL=1(cli). Or else, CPU resets! */
|
|
struct pt_regs regs;
|
|
|
|
memset(®s, 0, sizeof(regs));
|
|
regs.regs[4] = (unsigned long) arg;
|
|
regs.regs[5] = (unsigned long) fn;
|
|
|
|
regs.pc = (unsigned long) kernel_thread_helper;
|
|
regs.sr = (1 << 30);
|
|
|
|
/* Ok, create the new process.. */
|
|
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);
|
|
}
|
|
|
|
/*
|
|
* Free current thread data structures etc..
|
|
*/
|
|
void exit_thread(void)
|
|
{
|
|
if (current->thread.ubc_pc) {
|
|
current->thread.ubc_pc = 0;
|
|
ubc_usercnt -= 1;
|
|
}
|
|
}
|
|
|
|
void flush_thread(void)
|
|
{
|
|
#if defined(CONFIG_SH_FPU)
|
|
struct task_struct *tsk = current;
|
|
struct pt_regs *regs = (struct pt_regs *)
|
|
((unsigned long)tsk->thread_info
|
|
+ THREAD_SIZE - sizeof(struct pt_regs)
|
|
- sizeof(unsigned long));
|
|
|
|
/* Forget lazy FPU state */
|
|
clear_fpu(tsk, regs);
|
|
clear_used_math();
|
|
#endif
|
|
}
|
|
|
|
void release_thread(struct task_struct *dead_task)
|
|
{
|
|
/* do nothing */
|
|
}
|
|
|
|
/* Fill in the fpu structure for a core dump.. */
|
|
int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
|
|
{
|
|
int fpvalid = 0;
|
|
|
|
#if defined(CONFIG_SH_FPU)
|
|
struct task_struct *tsk = current;
|
|
|
|
fpvalid = !!tsk_used_math(tsk);
|
|
if (fpvalid) {
|
|
unlazy_fpu(tsk, regs);
|
|
memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu));
|
|
}
|
|
#endif
|
|
|
|
return fpvalid;
|
|
}
|
|
|
|
/*
|
|
* Capture the user space registers if the task is not running (in user space)
|
|
*/
|
|
int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs)
|
|
{
|
|
struct pt_regs ptregs;
|
|
|
|
ptregs = *(struct pt_regs *)
|
|
((unsigned long)tsk->thread_info + THREAD_SIZE
|
|
- sizeof(struct pt_regs)
|
|
#ifdef CONFIG_SH_DSP
|
|
- sizeof(struct pt_dspregs)
|
|
#endif
|
|
- sizeof(unsigned long));
|
|
elf_core_copy_regs(regs, &ptregs);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *fpu)
|
|
{
|
|
int fpvalid = 0;
|
|
|
|
#if defined(CONFIG_SH_FPU)
|
|
fpvalid = !!tsk_used_math(tsk);
|
|
if (fpvalid) {
|
|
struct pt_regs *regs = (struct pt_regs *)
|
|
((unsigned long)tsk->thread_info
|
|
+ THREAD_SIZE - sizeof(struct pt_regs)
|
|
- sizeof(unsigned long));
|
|
unlazy_fpu(tsk, regs);
|
|
memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu));
|
|
}
|
|
#endif
|
|
|
|
return fpvalid;
|
|
}
|
|
|
|
asmlinkage void ret_from_fork(void);
|
|
|
|
int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
|
|
unsigned long unused,
|
|
struct task_struct *p, struct pt_regs *regs)
|
|
{
|
|
struct pt_regs *childregs;
|
|
#if defined(CONFIG_SH_FPU)
|
|
struct task_struct *tsk = current;
|
|
|
|
unlazy_fpu(tsk, regs);
|
|
p->thread.fpu = tsk->thread.fpu;
|
|
copy_to_stopped_child_used_math(p);
|
|
#endif
|
|
|
|
childregs = ((struct pt_regs *)
|
|
(THREAD_SIZE + (unsigned long) p->thread_info)
|
|
#ifdef CONFIG_SH_DSP
|
|
- sizeof(struct pt_dspregs)
|
|
#endif
|
|
- sizeof(unsigned long)) - 1;
|
|
*childregs = *regs;
|
|
|
|
if (user_mode(regs)) {
|
|
childregs->regs[15] = usp;
|
|
} else {
|
|
childregs->regs[15] = (unsigned long)p->thread_info + THREAD_SIZE;
|
|
}
|
|
if (clone_flags & CLONE_SETTLS) {
|
|
childregs->gbr = childregs->regs[0];
|
|
}
|
|
childregs->regs[0] = 0; /* Set return value for child */
|
|
|
|
p->thread.sp = (unsigned long) childregs;
|
|
p->thread.pc = (unsigned long) ret_from_fork;
|
|
|
|
p->thread.ubc_pc = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* fill in the user structure for a core dump..
|
|
*/
|
|
void dump_thread(struct pt_regs * regs, struct user * dump)
|
|
{
|
|
dump->magic = CMAGIC;
|
|
dump->start_code = current->mm->start_code;
|
|
dump->start_data = current->mm->start_data;
|
|
dump->start_stack = regs->regs[15] & ~(PAGE_SIZE - 1);
|
|
dump->u_tsize = (current->mm->end_code - dump->start_code) >> PAGE_SHIFT;
|
|
dump->u_dsize = (current->mm->brk + (PAGE_SIZE-1) - dump->start_data) >> PAGE_SHIFT;
|
|
dump->u_ssize = (current->mm->start_stack - dump->start_stack +
|
|
PAGE_SIZE - 1) >> PAGE_SHIFT;
|
|
/* Debug registers will come here. */
|
|
|
|
dump->regs = *regs;
|
|
|
|
dump->u_fpvalid = dump_fpu(regs, &dump->fpu);
|
|
}
|
|
|
|
/* Tracing by user break controller. */
|
|
static void
|
|
ubc_set_tracing(int asid, unsigned long pc)
|
|
{
|
|
ctrl_outl(pc, UBC_BARA);
|
|
|
|
/* We don't have any ASID settings for the SH-2! */
|
|
if (cpu_data->type != CPU_SH7604)
|
|
ctrl_outb(asid, UBC_BASRA);
|
|
|
|
ctrl_outl(0, UBC_BAMRA);
|
|
|
|
if (cpu_data->type == CPU_SH7729) {
|
|
ctrl_outw(BBR_INST | BBR_READ | BBR_CPU, UBC_BBRA);
|
|
ctrl_outl(BRCR_PCBA | BRCR_PCTE, UBC_BRCR);
|
|
} else {
|
|
ctrl_outw(BBR_INST | BBR_READ, UBC_BBRA);
|
|
ctrl_outw(BRCR_PCBA, UBC_BRCR);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* switch_to(x,y) should switch tasks from x to y.
|
|
*
|
|
*/
|
|
struct task_struct *__switch_to(struct task_struct *prev, struct task_struct *next)
|
|
{
|
|
#if defined(CONFIG_SH_FPU)
|
|
struct pt_regs *regs = (struct pt_regs *)
|
|
((unsigned long)prev->thread_info
|
|
+ THREAD_SIZE - sizeof(struct pt_regs)
|
|
- sizeof(unsigned long));
|
|
unlazy_fpu(prev, regs);
|
|
#endif
|
|
|
|
#ifdef CONFIG_PREEMPT
|
|
{
|
|
unsigned long flags;
|
|
struct pt_regs *regs;
|
|
|
|
local_irq_save(flags);
|
|
regs = (struct pt_regs *)
|
|
((unsigned long)prev->thread_info
|
|
+ THREAD_SIZE - sizeof(struct pt_regs)
|
|
#ifdef CONFIG_SH_DSP
|
|
- sizeof(struct pt_dspregs)
|
|
#endif
|
|
- sizeof(unsigned long));
|
|
if (user_mode(regs) && regs->regs[15] >= 0xc0000000) {
|
|
int offset = (int)regs->regs[15];
|
|
|
|
/* Reset stack pointer: clear critical region mark */
|
|
regs->regs[15] = regs->regs[1];
|
|
if (regs->pc < regs->regs[0])
|
|
/* Go to rewind point */
|
|
regs->pc = regs->regs[0] + offset;
|
|
}
|
|
local_irq_restore(flags);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Restore the kernel mode register
|
|
* k7 (r7_bank1)
|
|
*/
|
|
asm volatile("ldc %0, r7_bank"
|
|
: /* no output */
|
|
: "r" (next->thread_info));
|
|
|
|
#ifdef CONFIG_MMU
|
|
/* If no tasks are using the UBC, we're done */
|
|
if (ubc_usercnt == 0)
|
|
/* If no tasks are using the UBC, we're done */;
|
|
else if (next->thread.ubc_pc && next->mm) {
|
|
ubc_set_tracing(next->mm->context & MMU_CONTEXT_ASID_MASK,
|
|
next->thread.ubc_pc);
|
|
} else {
|
|
ctrl_outw(0, UBC_BBRA);
|
|
ctrl_outw(0, UBC_BBRB);
|
|
}
|
|
#endif
|
|
|
|
return prev;
|
|
}
|
|
|
|
asmlinkage int sys_fork(unsigned long r4, unsigned long r5,
|
|
unsigned long r6, unsigned long r7,
|
|
struct pt_regs regs)
|
|
{
|
|
#ifdef CONFIG_MMU
|
|
return do_fork(SIGCHLD, regs.regs[15], ®s, 0, NULL, NULL);
|
|
#else
|
|
/* fork almost works, enough to trick you into looking elsewhere :-( */
|
|
return -EINVAL;
|
|
#endif
|
|
}
|
|
|
|
asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
|
|
unsigned long parent_tidptr,
|
|
unsigned long child_tidptr,
|
|
struct pt_regs regs)
|
|
{
|
|
if (!newsp)
|
|
newsp = regs.regs[15];
|
|
return do_fork(clone_flags, newsp, ®s, 0,
|
|
(int __user *)parent_tidptr, (int __user *)child_tidptr);
|
|
}
|
|
|
|
/*
|
|
* This is trivial, and on the face of it looks like it
|
|
* could equally well be done in user mode.
|
|
*
|
|
* Not so, for quite unobvious reasons - register pressure.
|
|
* In user mode vfork() cannot have a stack frame, and if
|
|
* done by calling the "clone()" system call directly, you
|
|
* do not have enough call-clobbered registers to hold all
|
|
* the information you need.
|
|
*/
|
|
asmlinkage int sys_vfork(unsigned long r4, unsigned long r5,
|
|
unsigned long r6, unsigned long r7,
|
|
struct pt_regs regs)
|
|
{
|
|
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.regs[15], ®s,
|
|
0, NULL, NULL);
|
|
}
|
|
|
|
/*
|
|
* sys_execve() executes a new program.
|
|
*/
|
|
asmlinkage int sys_execve(char *ufilename, char **uargv,
|
|
char **uenvp, unsigned long r7,
|
|
struct pt_regs regs)
|
|
{
|
|
int error;
|
|
char *filename;
|
|
|
|
filename = getname((char __user *)ufilename);
|
|
error = PTR_ERR(filename);
|
|
if (IS_ERR(filename))
|
|
goto out;
|
|
|
|
error = do_execve(filename,
|
|
(char __user * __user *)uargv,
|
|
(char __user * __user *)uenvp,
|
|
®s);
|
|
if (error == 0) {
|
|
task_lock(current);
|
|
current->ptrace &= ~PT_DTRACE;
|
|
task_unlock(current);
|
|
}
|
|
putname(filename);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
unsigned long get_wchan(struct task_struct *p)
|
|
{
|
|
unsigned long schedule_frame;
|
|
unsigned long pc;
|
|
|
|
if (!p || p == current || p->state == TASK_RUNNING)
|
|
return 0;
|
|
|
|
/*
|
|
* The same comment as on the Alpha applies here, too ...
|
|
*/
|
|
pc = thread_saved_pc(p);
|
|
if (in_sched_functions(pc)) {
|
|
schedule_frame = ((unsigned long *)(long)p->thread.sp)[1];
|
|
return (unsigned long)((unsigned long *)schedule_frame)[1];
|
|
}
|
|
return pc;
|
|
}
|
|
|
|
asmlinkage void break_point_trap(unsigned long r4, unsigned long r5,
|
|
unsigned long r6, unsigned long r7,
|
|
struct pt_regs regs)
|
|
{
|
|
/* Clear tracing. */
|
|
ctrl_outw(0, UBC_BBRA);
|
|
ctrl_outw(0, UBC_BBRB);
|
|
current->thread.ubc_pc = 0;
|
|
ubc_usercnt -= 1;
|
|
|
|
force_sig(SIGTRAP, current);
|
|
}
|
|
|
|
asmlinkage void break_point_trap_software(unsigned long r4, unsigned long r5,
|
|
unsigned long r6, unsigned long r7,
|
|
struct pt_regs regs)
|
|
{
|
|
regs.pc -= 2;
|
|
force_sig(SIGTRAP, current);
|
|
}
|