![Heiko Carstens](/assets/img/avatar_default.png)
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
191 lines
5.3 KiB
C
191 lines
5.3 KiB
C
/*
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* Stack dumping functions
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*
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* Copyright IBM Corp. 1999, 2013
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*/
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#include <linux/kallsyms.h>
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#include <linux/hardirq.h>
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#include <linux/kprobes.h>
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#include <linux/utsname.h>
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#include <linux/export.h>
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#include <linux/kdebug.h>
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#include <linux/ptrace.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/sched/debug.h>
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#include <linux/sched/task_stack.h>
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#include <asm/processor.h>
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#include <asm/debug.h>
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#include <asm/dis.h>
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#include <asm/ipl.h>
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/*
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* For dump_trace we have tree different stack to consider:
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* - the panic stack which is used if the kernel stack has overflown
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* - the asynchronous interrupt stack (cpu related)
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* - the synchronous kernel stack (process related)
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* The stack trace can start at any of the three stacks and can potentially
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* touch all of them. The order is: panic stack, async stack, sync stack.
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*/
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static unsigned long
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__dump_trace(dump_trace_func_t func, void *data, unsigned long sp,
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unsigned long low, unsigned long high)
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{
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struct stack_frame *sf;
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struct pt_regs *regs;
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while (1) {
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if (sp < low || sp > high - sizeof(*sf))
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return sp;
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sf = (struct stack_frame *) sp;
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if (func(data, sf->gprs[8], 0))
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return sp;
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/* Follow the backchain. */
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while (1) {
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low = sp;
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sp = sf->back_chain;
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if (!sp)
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break;
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if (sp <= low || sp > high - sizeof(*sf))
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return sp;
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sf = (struct stack_frame *) sp;
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if (func(data, sf->gprs[8], 1))
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return sp;
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}
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/* Zero backchain detected, check for interrupt frame. */
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sp = (unsigned long) (sf + 1);
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if (sp <= low || sp > high - sizeof(*regs))
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return sp;
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regs = (struct pt_regs *) sp;
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if (!user_mode(regs)) {
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if (func(data, regs->psw.addr, 1))
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return sp;
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}
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low = sp;
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sp = regs->gprs[15];
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}
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}
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void dump_trace(dump_trace_func_t func, void *data, struct task_struct *task,
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unsigned long sp)
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{
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unsigned long frame_size;
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frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
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#ifdef CONFIG_CHECK_STACK
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sp = __dump_trace(func, data, sp,
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S390_lowcore.panic_stack + frame_size - PAGE_SIZE,
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S390_lowcore.panic_stack + frame_size);
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#endif
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sp = __dump_trace(func, data, sp,
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S390_lowcore.async_stack + frame_size - ASYNC_SIZE,
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S390_lowcore.async_stack + frame_size);
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task = task ?: current;
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__dump_trace(func, data, sp,
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(unsigned long)task_stack_page(task),
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(unsigned long)task_stack_page(task) + THREAD_SIZE);
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}
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EXPORT_SYMBOL_GPL(dump_trace);
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static int show_address(void *data, unsigned long address, int reliable)
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{
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if (reliable)
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printk(" [<%016lx>] %pSR \n", address, (void *)address);
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else
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printk("([<%016lx>] %pSR)\n", address, (void *)address);
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return 0;
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}
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void show_stack(struct task_struct *task, unsigned long *stack)
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{
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unsigned long sp = (unsigned long) stack;
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if (!sp)
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sp = task ? task->thread.ksp : current_stack_pointer();
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printk("Call Trace:\n");
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dump_trace(show_address, NULL, task, sp);
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if (!task)
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task = current;
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debug_show_held_locks(task);
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}
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static void show_last_breaking_event(struct pt_regs *regs)
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{
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printk("Last Breaking-Event-Address:\n");
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printk(" [<%016lx>] %pSR\n", regs->args[0], (void *)regs->args[0]);
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}
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void show_registers(struct pt_regs *regs)
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{
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struct psw_bits *psw = &psw_bits(regs->psw);
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char *mode;
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mode = user_mode(regs) ? "User" : "Krnl";
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printk("%s PSW : %p %p", mode, (void *)regs->psw.mask, (void *)regs->psw.addr);
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if (!user_mode(regs))
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pr_cont(" (%pSR)", (void *)regs->psw.addr);
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pr_cont("\n");
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printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
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"P:%x AS:%x CC:%x PM:%x", psw->per, psw->dat, psw->io, psw->ext,
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psw->key, psw->mcheck, psw->wait, psw->pstate, psw->as, psw->cc, psw->pm);
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pr_cont(" RI:%x EA:%x\n", psw->ri, psw->eaba);
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printk("%s GPRS: %016lx %016lx %016lx %016lx\n", mode,
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regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
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printk(" %016lx %016lx %016lx %016lx\n",
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regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
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printk(" %016lx %016lx %016lx %016lx\n",
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regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
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printk(" %016lx %016lx %016lx %016lx\n",
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regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
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show_code(regs);
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}
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void show_regs(struct pt_regs *regs)
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{
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show_regs_print_info(KERN_DEFAULT);
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show_registers(regs);
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/* Show stack backtrace if pt_regs is from kernel mode */
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if (!user_mode(regs))
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show_stack(NULL, (unsigned long *) regs->gprs[15]);
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show_last_breaking_event(regs);
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}
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static DEFINE_SPINLOCK(die_lock);
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void die(struct pt_regs *regs, const char *str)
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{
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static int die_counter;
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oops_enter();
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lgr_info_log();
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debug_stop_all();
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console_verbose();
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spin_lock_irq(&die_lock);
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bust_spinlocks(1);
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printk("%s: %04x ilc:%d [#%d] ", str, regs->int_code & 0xffff,
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regs->int_code >> 17, ++die_counter);
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#ifdef CONFIG_PREEMPT
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pr_cont("PREEMPT ");
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#endif
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#ifdef CONFIG_SMP
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pr_cont("SMP ");
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#endif
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if (debug_pagealloc_enabled())
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pr_cont("DEBUG_PAGEALLOC");
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pr_cont("\n");
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notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);
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print_modules();
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show_regs(regs);
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bust_spinlocks(0);
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add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
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spin_unlock_irq(&die_lock);
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if (in_interrupt())
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panic("Fatal exception in interrupt");
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if (panic_on_oops)
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panic("Fatal exception: panic_on_oops");
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oops_exit();
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do_exit(SIGSEGV);
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}
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