forked from Qortal/Brooklyn
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.
286 lines
7.3 KiB
286 lines
7.3 KiB
// 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/syscalls.h> |
|
#include <linux/uaccess.h> |
|
|
|
#include <asm/traps.h> |
|
#include <asm/machdep.h> |
|
#include <asm/setup.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.fc = USER_DATA; |
|
#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 |
|
* kernel_clone() anyway. So in this case it's actually better to pass pt_regs * |
|
* and extract arguments for kernel_clone() from there. Eventually we might |
|
* go for calling kernel_clone() directly from the wrapper, but only after we |
|
* are finished with kernel_clone() prototype conversion. |
|
*/ |
|
asmlinkage int m68k_clone(struct pt_regs *regs) |
|
{ |
|
/* regs will be equal to current_pt_regs() */ |
|
struct kernel_clone_args args = { |
|
.flags = regs->d1 & ~CSIGNAL, |
|
.pidfd = (int __user *)regs->d3, |
|
.child_tid = (int __user *)regs->d4, |
|
.parent_tid = (int __user *)regs->d3, |
|
.exit_signal = regs->d1 & CSIGNAL, |
|
.stack = regs->d2, |
|
.tls = regs->d5, |
|
}; |
|
|
|
return kernel_clone(&args); |
|
} |
|
|
|
/* |
|
* Because extra registers are saved on the stack after the sys_clone3() |
|
* arguments, this C wrapper extracts them from pt_regs * and then calls the |
|
* generic sys_clone3() implementation. |
|
*/ |
|
asmlinkage int m68k_clone3(struct pt_regs *regs) |
|
{ |
|
return sys_clone3((struct clone_args __user *)regs->d1, regs->d2); |
|
} |
|
|
|
int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg, |
|
struct task_struct *p, unsigned long tls) |
|
{ |
|
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.fc = USER_DATA; |
|
|
|
if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) { |
|
/* 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 = tls; |
|
|
|
#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 || task_is_running(p)) |
|
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; |
|
}
|
|
|