268 lines
6.7 KiB
C
268 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* 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/errno.h>
|
|
#include <linux/module.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/sched/debug.h>
|
|
#include <linux/sched/task.h>
|
|
#include <linux/sched/task_stack.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/unistd.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/user.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/init_task.h>
|
|
#include <linux/mqueue.h>
|
|
#include <linux/rcupdate.h>
|
|
|
|
#include <linux/uaccess.h>
|
|
#include <asm/traps.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
|
|
asmlinkage void ret_from_fork(void);
|
|
asmlinkage void ret_from_kernel_thread(void);
|
|
|
|
void arch_cpu_idle(void)
|
|
{
|
|
#if defined(MACH_ATARI_ONLY)
|
|
/* block out HSYNC on the atari (falcon) */
|
|
__asm__("stop #0x2200" : : : "cc");
|
|
#else
|
|
__asm__("stop #0x2000" : : : "cc");
|
|
#endif
|
|
}
|
|
|
|
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 (*pm_power_off)(void) = machine_power_off;
|
|
EXPORT_SYMBOL(pm_power_off);
|
|
|
|
void show_regs(struct pt_regs * regs)
|
|
{
|
|
pr_info("Format %02x Vector: %04x PC: %08lx Status: %04x %s\n",
|
|
regs->format, regs->vector, regs->pc, regs->sr,
|
|
print_tainted());
|
|
pr_info("ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n",
|
|
regs->orig_d0, regs->d0, regs->a2, regs->a1);
|
|
pr_info("A0: %08lx D5: %08lx D4: %08lx\n", regs->a0, regs->d5,
|
|
regs->d4);
|
|
pr_info("D3: %08lx D2: %08lx D1: %08lx\n", regs->d3, regs->d2,
|
|
regs->d1);
|
|
if (!(regs->sr & PS_S))
|
|
pr_info("USP: %08lx\n", rdusp());
|
|
}
|
|
|
|
void flush_thread(void)
|
|
{
|
|
current->thread.fs = __USER_DS;
|
|
#ifdef CONFIG_FPU
|
|
if (!FPU_IS_EMU) {
|
|
unsigned long zero = 0;
|
|
asm volatile("frestore %0": :"m" (zero));
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Why not generic sys_clone, you ask? m68k passes all arguments on stack.
|
|
* And we need all registers saved, which means a bunch of stuff pushed
|
|
* on top of pt_regs, which means that sys_clone() arguments would be
|
|
* buried. We could, of course, copy them, but it's too costly for no
|
|
* good reason - generic clone() would have to copy them *again* for
|
|
* do_fork() anyway. So in this case it's actually better to pass pt_regs *
|
|
* and extract arguments for do_fork() from there. Eventually we might
|
|
* go for calling do_fork() directly from the wrapper, but only after we
|
|
* are finished with do_fork() prototype conversion.
|
|
*/
|
|
asmlinkage int m68k_clone(struct pt_regs *regs)
|
|
{
|
|
/* regs will be equal to current_pt_regs() */
|
|
return do_fork(regs->d1, regs->d2, 0,
|
|
(int __user *)regs->d3, (int __user *)regs->d4);
|
|
}
|
|
|
|
int copy_thread(unsigned long clone_flags, unsigned long usp,
|
|
unsigned long arg, struct task_struct *p)
|
|
{
|
|
struct fork_frame {
|
|
struct switch_stack sw;
|
|
struct pt_regs regs;
|
|
} *frame;
|
|
|
|
frame = (struct fork_frame *) (task_stack_page(p) + THREAD_SIZE) - 1;
|
|
|
|
p->thread.ksp = (unsigned long)frame;
|
|
p->thread.esp0 = (unsigned long)&frame->regs;
|
|
|
|
/*
|
|
* 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;
|
|
|
|
if (unlikely(p->flags & PF_KTHREAD)) {
|
|
/* kernel thread */
|
|
memset(frame, 0, sizeof(struct fork_frame));
|
|
frame->regs.sr = PS_S;
|
|
frame->sw.a3 = usp; /* function */
|
|
frame->sw.d7 = arg;
|
|
frame->sw.retpc = (unsigned long)ret_from_kernel_thread;
|
|
p->thread.usp = 0;
|
|
return 0;
|
|
}
|
|
memcpy(frame, container_of(current_pt_regs(), struct fork_frame, regs),
|
|
sizeof(struct fork_frame));
|
|
frame->regs.d0 = 0;
|
|
frame->sw.retpc = (unsigned long)ret_from_fork;
|
|
p->thread.usp = usp ?: rdusp();
|
|
|
|
if (clone_flags & CLONE_SETTLS)
|
|
task_thread_info(p)->tp_value = frame->regs.d5;
|
|
|
|
#ifdef CONFIG_FPU
|
|
if (!FPU_IS_EMU) {
|
|
/* Copy the current fpu state */
|
|
asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
|
|
|
|
if (!CPU_IS_060 ? p->thread.fpstate[0] : p->thread.fpstate[2]) {
|
|
if (CPU_IS_COLDFIRE) {
|
|
asm volatile ("fmovemd %/fp0-%/fp7,%0\n\t"
|
|
"fmovel %/fpiar,%1\n\t"
|
|
"fmovel %/fpcr,%2\n\t"
|
|
"fmovel %/fpsr,%3"
|
|
:
|
|
: "m" (p->thread.fp[0]),
|
|
"m" (p->thread.fpcntl[0]),
|
|
"m" (p->thread.fpcntl[1]),
|
|
"m" (p->thread.fpcntl[2])
|
|
: "memory");
|
|
} else {
|
|
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 /* CONFIG_FPU */
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Fill in the fpu structure for a core dump. */
|
|
int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
|
|
{
|
|
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;
|
|
}
|
|
|
|
if (IS_ENABLED(CONFIG_FPU)) {
|
|
char fpustate[216];
|
|
|
|
/* First dump the fpu context to avoid protocol violation. */
|
|
asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
|
|
if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
|
|
return 0;
|
|
|
|
if (CPU_IS_COLDFIRE) {
|
|
asm volatile ("fmovel %/fpiar,%0\n\t"
|
|
"fmovel %/fpcr,%1\n\t"
|
|
"fmovel %/fpsr,%2\n\t"
|
|
"fmovemd %/fp0-%/fp7,%3"
|
|
:
|
|
: "m" (fpu->fpcntl[0]),
|
|
"m" (fpu->fpcntl[1]),
|
|
"m" (fpu->fpcntl[2]),
|
|
"m" (fpu->fpregs[0])
|
|
: "memory");
|
|
} else {
|
|
asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
|
|
:
|
|
: "m" (fpu->fpcntl[0])
|
|
: "memory");
|
|
asm volatile ("fmovemx %/fp0-%/fp7,%0"
|
|
:
|
|
: "m" (fpu->fpregs[0])
|
|
: "memory");
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL(dump_fpu);
|
|
|
|
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)task_stack_page(p);
|
|
fp = ((struct switch_stack *)p->thread.ksp)->a6;
|
|
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;
|
|
}
|