263 lines
6.0 KiB
C
263 lines
6.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (C) 2005-2017 Andes Technology Corporation
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/sched/debug.h>
|
|
#include <linux/sched/task_stack.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/elf.h>
|
|
#include <asm/proc-fns.h>
|
|
#include <asm/fpu.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/reboot.h>
|
|
|
|
#if IS_ENABLED(CONFIG_LAZY_FPU)
|
|
struct task_struct *last_task_used_math;
|
|
#endif
|
|
|
|
extern void setup_mm_for_reboot(char mode);
|
|
|
|
extern inline void arch_reset(char mode)
|
|
{
|
|
if (mode == 's') {
|
|
/* Use cpu handler, jump to 0 */
|
|
cpu_reset(0);
|
|
}
|
|
}
|
|
|
|
void (*pm_power_off) (void);
|
|
EXPORT_SYMBOL(pm_power_off);
|
|
|
|
static char reboot_mode_nds32 = 'h';
|
|
|
|
int __init reboot_setup(char *str)
|
|
{
|
|
reboot_mode_nds32 = str[0];
|
|
return 1;
|
|
}
|
|
|
|
static int cpub_pwroff(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
__setup("reboot=", reboot_setup);
|
|
|
|
void machine_halt(void)
|
|
{
|
|
cpub_pwroff();
|
|
}
|
|
|
|
EXPORT_SYMBOL(machine_halt);
|
|
|
|
void machine_power_off(void)
|
|
{
|
|
if (pm_power_off)
|
|
pm_power_off();
|
|
}
|
|
|
|
EXPORT_SYMBOL(machine_power_off);
|
|
|
|
void machine_restart(char *cmd)
|
|
{
|
|
/*
|
|
* Clean and disable cache, and turn off interrupts
|
|
*/
|
|
cpu_proc_fin();
|
|
|
|
/*
|
|
* Tell the mm system that we are going to reboot -
|
|
* we may need it to insert some 1:1 mappings so that
|
|
* soft boot works.
|
|
*/
|
|
setup_mm_for_reboot(reboot_mode_nds32);
|
|
|
|
/* Execute kernel restart handler call chain */
|
|
do_kernel_restart(cmd);
|
|
|
|
/*
|
|
* Now call the architecture specific reboot code.
|
|
*/
|
|
arch_reset(reboot_mode_nds32);
|
|
|
|
/*
|
|
* Whoops - the architecture was unable to reboot.
|
|
* Tell the user!
|
|
*/
|
|
mdelay(1000);
|
|
pr_info("Reboot failed -- System halted\n");
|
|
while (1) ;
|
|
}
|
|
|
|
EXPORT_SYMBOL(machine_restart);
|
|
|
|
void show_regs(struct pt_regs *regs)
|
|
{
|
|
printk("PC is at %pS\n", (void *)instruction_pointer(regs));
|
|
printk("LP is at %pS\n", (void *)regs->lp);
|
|
pr_info("pc : [<%08lx>] lp : [<%08lx>] %s\n"
|
|
"sp : %08lx fp : %08lx gp : %08lx\n",
|
|
instruction_pointer(regs),
|
|
regs->lp, print_tainted(), regs->sp, regs->fp, regs->gp);
|
|
pr_info("r25: %08lx r24: %08lx\n", regs->uregs[25], regs->uregs[24]);
|
|
|
|
pr_info("r23: %08lx r22: %08lx r21: %08lx r20: %08lx\n",
|
|
regs->uregs[23], regs->uregs[22],
|
|
regs->uregs[21], regs->uregs[20]);
|
|
pr_info("r19: %08lx r18: %08lx r17: %08lx r16: %08lx\n",
|
|
regs->uregs[19], regs->uregs[18],
|
|
regs->uregs[17], regs->uregs[16]);
|
|
pr_info("r15: %08lx r14: %08lx r13: %08lx r12: %08lx\n",
|
|
regs->uregs[15], regs->uregs[14],
|
|
regs->uregs[13], regs->uregs[12]);
|
|
pr_info("r11: %08lx r10: %08lx r9 : %08lx r8 : %08lx\n",
|
|
regs->uregs[11], regs->uregs[10],
|
|
regs->uregs[9], regs->uregs[8]);
|
|
pr_info("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
|
|
regs->uregs[7], regs->uregs[6], regs->uregs[5], regs->uregs[4]);
|
|
pr_info("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
|
|
regs->uregs[3], regs->uregs[2], regs->uregs[1], regs->uregs[0]);
|
|
pr_info(" IRQs o%s Segment %s\n",
|
|
interrupts_enabled(regs) ? "n" : "ff",
|
|
uaccess_kernel() ? "kernel" : "user");
|
|
}
|
|
|
|
EXPORT_SYMBOL(show_regs);
|
|
|
|
void exit_thread(struct task_struct *tsk)
|
|
{
|
|
#if defined(CONFIG_FPU) && defined(CONFIG_LAZY_FPU)
|
|
if (last_task_used_math == tsk)
|
|
last_task_used_math = NULL;
|
|
#endif
|
|
}
|
|
|
|
void flush_thread(void)
|
|
{
|
|
#if defined(CONFIG_FPU)
|
|
clear_fpu(task_pt_regs(current));
|
|
clear_used_math();
|
|
# ifdef CONFIG_LAZY_FPU
|
|
if (last_task_used_math == current)
|
|
last_task_used_math = NULL;
|
|
# endif
|
|
#endif
|
|
}
|
|
|
|
DEFINE_PER_CPU(struct task_struct *, __entry_task);
|
|
|
|
asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
|
|
int copy_thread(unsigned long clone_flags, unsigned long stack_start,
|
|
unsigned long stk_sz, struct task_struct *p, unsigned long tls)
|
|
{
|
|
struct pt_regs *childregs = task_pt_regs(p);
|
|
|
|
memset(&p->thread.cpu_context, 0, sizeof(struct cpu_context));
|
|
|
|
if (unlikely(p->flags & PF_KTHREAD)) {
|
|
memset(childregs, 0, sizeof(struct pt_regs));
|
|
/* kernel thread fn */
|
|
p->thread.cpu_context.r6 = stack_start;
|
|
/* kernel thread argument */
|
|
p->thread.cpu_context.r7 = stk_sz;
|
|
} else {
|
|
*childregs = *current_pt_regs();
|
|
if (stack_start)
|
|
childregs->sp = stack_start;
|
|
/* child get zero as ret. */
|
|
childregs->uregs[0] = 0;
|
|
childregs->osp = 0;
|
|
if (clone_flags & CLONE_SETTLS)
|
|
childregs->uregs[25] = tls;
|
|
}
|
|
/* cpu context switching */
|
|
p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
|
|
p->thread.cpu_context.sp = (unsigned long)childregs;
|
|
|
|
#if IS_ENABLED(CONFIG_FPU)
|
|
if (used_math()) {
|
|
# if !IS_ENABLED(CONFIG_LAZY_FPU)
|
|
unlazy_fpu(current);
|
|
# else
|
|
preempt_disable();
|
|
if (last_task_used_math == current)
|
|
save_fpu(current);
|
|
preempt_enable();
|
|
# endif
|
|
p->thread.fpu = current->thread.fpu;
|
|
clear_fpu(task_pt_regs(p));
|
|
set_stopped_child_used_math(p);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_HWZOL
|
|
childregs->lb = 0;
|
|
childregs->le = 0;
|
|
childregs->lc = 0;
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_FPU)
|
|
struct task_struct *_switch_fpu(struct task_struct *prev, struct task_struct *next)
|
|
{
|
|
#if !IS_ENABLED(CONFIG_LAZY_FPU)
|
|
unlazy_fpu(prev);
|
|
#endif
|
|
if (!(next->flags & PF_KTHREAD))
|
|
clear_fpu(task_pt_regs(next));
|
|
return prev;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* fill in the fpe structure for a core dump...
|
|
*/
|
|
int dump_fpu(struct pt_regs *regs, elf_fpregset_t * fpu)
|
|
{
|
|
int fpvalid = 0;
|
|
#if IS_ENABLED(CONFIG_FPU)
|
|
struct task_struct *tsk = current;
|
|
|
|
fpvalid = tsk_used_math(tsk);
|
|
if (fpvalid) {
|
|
lose_fpu();
|
|
memcpy(fpu, &tsk->thread.fpu, sizeof(*fpu));
|
|
}
|
|
#endif
|
|
return fpvalid;
|
|
}
|
|
|
|
EXPORT_SYMBOL(dump_fpu);
|
|
|
|
unsigned long get_wchan(struct task_struct *p)
|
|
{
|
|
unsigned long fp, lr;
|
|
unsigned long stack_start, stack_end;
|
|
int count = 0;
|
|
|
|
if (!p || p == current || p->state == TASK_RUNNING)
|
|
return 0;
|
|
|
|
if (IS_ENABLED(CONFIG_FRAME_POINTER)) {
|
|
stack_start = (unsigned long)end_of_stack(p);
|
|
stack_end = (unsigned long)task_stack_page(p) + THREAD_SIZE;
|
|
|
|
fp = thread_saved_fp(p);
|
|
do {
|
|
if (fp < stack_start || fp > stack_end)
|
|
return 0;
|
|
lr = ((unsigned long *)fp)[0];
|
|
if (!in_sched_functions(lr))
|
|
return lr;
|
|
fp = *(unsigned long *)(fp + 4);
|
|
} while (count++ < 16);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(get_wchan);
|