Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * Stack dumping functions
 *
 *  Copyright IBM Corp. 1999, 2013
 */
 
#include <linux/kallsyms.h>
#include <linux/hardirq.h>
#include <linux/kprobes.h>
#include <linux/utsname.h>
#include <linux/export.h>
#include <linux/kdebug.h>
#include <linux/ptrace.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/sched/task_stack.h>
#include <asm/processor.h>
#include <asm/debug.h>
#include <asm/dis.h>
#include <asm/ipl.h>
#include <asm/unwind.h>
 
const char *stack_type_name(enum stack_type type)
{
<------>switch (type) {
<------>case STACK_TYPE_TASK:
<------><------>return "task";
<------>case STACK_TYPE_IRQ:
<------><------>return "irq";
<------>case STACK_TYPE_NODAT:
<------><------>return "nodat";
<------>case STACK_TYPE_RESTART:
<------><------>return "restart";
<------>default:
<------><------>return "unknown";
<------>}
}
EXPORT_SYMBOL_GPL(stack_type_name);
 
static inline bool in_stack(unsigned long sp, struct stack_info *info,
<------><------><------>    enum stack_type type, unsigned long low,
<------><------><------>    unsigned long high)
{
<------>if (sp < low || sp >= high)
<------><------>return false;
<------>info->type = type;
<------>info->begin = low;
<------>info->end = high;
<------>return true;
}
 
static bool in_task_stack(unsigned long sp, struct task_struct *task,
<------><------><------>  struct stack_info *info)
{
<------>unsigned long stack;
 
<------>stack = (unsigned long) task_stack_page(task);
<------>return in_stack(sp, info, STACK_TYPE_TASK, stack, stack + THREAD_SIZE);
}
 
static bool in_irq_stack(unsigned long sp, struct stack_info *info)
{
<------>unsigned long frame_size, top;
 
<------>frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
<------>top = S390_lowcore.async_stack + frame_size;
<------>return in_stack(sp, info, STACK_TYPE_IRQ, top - THREAD_SIZE, top);
}
 
static bool in_nodat_stack(unsigned long sp, struct stack_info *info)
{
<------>unsigned long frame_size, top;
 
<------>frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
<------>top = S390_lowcore.nodat_stack + frame_size;
<------>return in_stack(sp, info, STACK_TYPE_NODAT, top - THREAD_SIZE, top);
}
 
static bool in_restart_stack(unsigned long sp, struct stack_info *info)
{
<------>unsigned long frame_size, top;
 
<------>frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
<------>top = S390_lowcore.restart_stack + frame_size;
<------>return in_stack(sp, info, STACK_TYPE_RESTART, top - THREAD_SIZE, top);
}
 
int get_stack_info(unsigned long sp, struct task_struct *task,
<------><------>   struct stack_info *info, unsigned long *visit_mask)
{
<------>if (!sp)
<------><------>goto unknown;
 
<------>/* Sanity check: ABI requires SP to be aligned 8 bytes. */
<------>if (sp & 0x7)
<------><------>goto unknown;
 
<------>/* Check per-task stack */
<------>if (in_task_stack(sp, task, info))
<------><------>goto recursion_check;
 
<------>if (task != current)
<------><------>goto unknown;
 
<------>/* Check per-cpu stacks */
<------>if (!in_irq_stack(sp, info) &&
<------>    !in_nodat_stack(sp, info) &&
<------>    !in_restart_stack(sp, info))
<------><------>goto unknown;
 
recursion_check:
<------>/*
<------> * Make sure we don't iterate through any given stack more than once.
<------> * If it comes up a second time then there's something wrong going on:
<------> * just break out and report an unknown stack type.
<------> */
<------>if (*visit_mask & (1UL << info->type))
<------><------>goto unknown;
<------>*visit_mask |= 1UL << info->type;
<------>return 0;
unknown:
<------>info->type = STACK_TYPE_UNKNOWN;
<------>return -EINVAL;
}
 
void show_stack(struct task_struct *task, unsigned long *stack,
<------><------>       const char *loglvl)
{
<------>struct unwind_state state;
 
<------>printk("%sCall Trace:\n", loglvl);
<------>unwind_for_each_frame(&state, task, NULL, (unsigned long) stack)
<------><------>printk(state.reliable ? "%s [<%016lx>] %pSR \n" :
<------><------><------><------><------>"%s([<%016lx>] %pSR)\n",
<------><------>       loglvl, state.ip, (void *) state.ip);
<------>debug_show_held_locks(task ? : current);
}
 
static void show_last_breaking_event(struct pt_regs *regs)
{
<------>printk("Last Breaking-Event-Address:\n");
<------>printk(" [<%016lx>] %pSR\n", regs->args[0], (void *)regs->args[0]);
}
 
void show_registers(struct pt_regs *regs)
{
<------>struct psw_bits *psw = &psw_bits(regs->psw);
<------>char *mode;
 
<------>mode = user_mode(regs) ? "User" : "Krnl";
<------>printk("%s PSW : %px %px", mode, (void *)regs->psw.mask, (void *)regs->psw.addr);
<------>if (!user_mode(regs))
<------><------>pr_cont(" (%pSR)", (void *)regs->psw.addr);
<------>pr_cont("\n");
<------>printk("           R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
<------>       "P:%x AS:%x CC:%x PM:%x", psw->per, psw->dat, psw->io, psw->ext,
<------>       psw->key, psw->mcheck, psw->wait, psw->pstate, psw->as, psw->cc, psw->pm);
<------>pr_cont(" RI:%x EA:%x\n", psw->ri, psw->eaba);
<------>printk("%s GPRS: %016lx %016lx %016lx %016lx\n", mode,
<------>       regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
<------>printk("           %016lx %016lx %016lx %016lx\n",
<------>       regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
<------>printk("           %016lx %016lx %016lx %016lx\n",
<------>       regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
<------>printk("           %016lx %016lx %016lx %016lx\n",
<------>       regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
<------>show_code(regs);
}
 
void show_regs(struct pt_regs *regs)
{
<------>show_regs_print_info(KERN_DEFAULT);
<------>show_registers(regs);
<------>/* Show stack backtrace if pt_regs is from kernel mode */
<------>if (!user_mode(regs))
<------><------>show_stack(NULL, (unsigned long *) regs->gprs[15], KERN_DEFAULT);
<------>show_last_breaking_event(regs);
}
 
static DEFINE_SPINLOCK(die_lock);
 
void die(struct pt_regs *regs, const char *str)
{
<------>static int die_counter;
 
<------>oops_enter();
<------>lgr_info_log();
<------>debug_stop_all();
<------>console_verbose();
<------>spin_lock_irq(&die_lock);
<------>bust_spinlocks(1);
<------>printk("%s: %04x ilc:%d [#%d] ", str, regs->int_code & 0xffff,
<------>       regs->int_code >> 17, ++die_counter);
#ifdef CONFIG_PREEMPT
<------>pr_cont("PREEMPT ");
#elif defined(CONFIG_PREEMPT_RT)
<------>pr_cont("PREEMPT_RT ");
#endif
<------>pr_cont("SMP ");
<------>if (debug_pagealloc_enabled())
<------><------>pr_cont("DEBUG_PAGEALLOC");
<------>pr_cont("\n");
<------>notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);
<------>print_modules();
<------>show_regs(regs);
<------>bust_spinlocks(0);
<------>add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
<------>spin_unlock_irq(&die_lock);
<------>if (in_interrupt())
<------><------>panic("Fatal exception in interrupt");
<------>if (panic_on_oops)
<------><------>panic("Fatal exception: panic_on_oops");
<------>oops_exit();
<------>do_exit(SIGSEGV);
}