Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2)  *  Copyright (C) 1991, 1992  Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *  Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/kallsyms.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/kprobes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/utsname.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/hardirq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/kdebug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/sched/debug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/ftrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/kexec.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/bug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/nmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/sysfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/kasan.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <asm/cpu_entry_area.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <asm/stacktrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <asm/unwind.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) int panic_on_unrecovered_nmi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) int panic_on_io_nmi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) static int die_counter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) static struct pt_regs exec_summary_regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) bool noinstr in_task_stack(unsigned long *stack, struct task_struct *task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 			   struct stack_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	unsigned long *begin = task_stack_page(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	unsigned long *end   = task_stack_page(task) + THREAD_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	if (stack < begin || stack >= end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	info->type	= STACK_TYPE_TASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	info->begin	= begin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	info->end	= end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	info->next_sp	= NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) /* Called from get_stack_info_noinstr - so must be noinstr too */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) bool noinstr in_entry_stack(unsigned long *stack, struct stack_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	struct entry_stack *ss = cpu_entry_stack(smp_processor_id());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	void *begin = ss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	void *end = ss + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	if ((void *)stack < begin || (void *)stack >= end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	info->type	= STACK_TYPE_ENTRY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	info->begin	= begin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	info->end	= end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	info->next_sp	= NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) static void printk_stack_address(unsigned long address, int reliable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 				 const char *log_lvl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	touch_nmi_watchdog();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	printk("%s %s%pB\n", log_lvl, reliable ? "" : "? ", (void *)address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) static int copy_code(struct pt_regs *regs, u8 *buf, unsigned long src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		     unsigned int nbytes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	if (!user_mode(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		return copy_from_kernel_nofault(buf, (u8 *)src, nbytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	/* The user space code from other tasks cannot be accessed. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	if (regs != task_pt_regs(current))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	 * Make sure userspace isn't trying to trick us into dumping kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	 * memory by pointing the userspace instruction pointer at it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	if (__chk_range_not_ok(src, nbytes, TASK_SIZE_MAX))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	 * Even if named copy_from_user_nmi() this can be invoked from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	 * other contexts and will not try to resolve a pagefault, which is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	 * the correct thing to do here as this code can be called from any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	 * context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	return copy_from_user_nmi(buf, (void __user *)src, nbytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)  * There are a couple of reasons for the 2/3rd prologue, courtesy of Linus:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)  * In case where we don't have the exact kernel image (which, if we did, we can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)  * simply disassemble and navigate to the RIP), the purpose of the bigger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)  * prologue is to have more context and to be able to correlate the code from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)  * the different toolchains better.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)  * In addition, it helps in recreating the register allocation of the failing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)  * kernel and thus make sense of the register dump.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)  * What is more, the additional complication of a variable length insn arch like
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)  * x86 warrants having longer byte sequence before rIP so that the disassembler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)  * can "sync" up properly and find instruction boundaries when decoding the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)  * opcode bytes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)  * Thus, the 2/3rds prologue and 64 byte OPCODE_BUFSIZE is just a random
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)  * guesstimate in attempt to achieve all of the above.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) void show_opcodes(struct pt_regs *regs, const char *loglvl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) #define PROLOGUE_SIZE 42
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) #define EPILOGUE_SIZE 21
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) #define OPCODE_BUFSIZE (PROLOGUE_SIZE + 1 + EPILOGUE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	u8 opcodes[OPCODE_BUFSIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	unsigned long prologue = regs->ip - PROLOGUE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	switch (copy_code(regs, opcodes, prologue, sizeof(opcodes))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		printk("%sCode: %" __stringify(PROLOGUE_SIZE) "ph <%02x> %"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		       __stringify(EPILOGUE_SIZE) "ph\n", loglvl, opcodes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		       opcodes[PROLOGUE_SIZE], opcodes + PROLOGUE_SIZE + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	case -EPERM:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		/* No access to the user space stack of other tasks. Ignore. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		printk("%sCode: Unable to access opcode bytes at RIP 0x%lx.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		       loglvl, prologue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) void show_ip(struct pt_regs *regs, const char *loglvl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) #ifdef CONFIG_X86_32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	printk("%sEIP: %pS\n", loglvl, (void *)regs->ip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	printk("%sRIP: %04x:%pS\n", loglvl, (int)regs->cs, (void *)regs->ip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	show_opcodes(regs, loglvl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) void show_iret_regs(struct pt_regs *regs, const char *log_lvl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	show_ip(regs, log_lvl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	printk("%sRSP: %04x:%016lx EFLAGS: %08lx", log_lvl, (int)regs->ss,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		regs->sp, regs->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) static void show_regs_if_on_stack(struct stack_info *info, struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 				  bool partial, const char *log_lvl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	 * These on_stack() checks aren't strictly necessary: the unwind code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	 * has already validated the 'regs' pointer.  The checks are done for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	 * ordering reasons: if the registers are on the next stack, we don't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	 * want to print them out yet.  Otherwise they'll be shown as part of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	 * the wrong stack.  Later, when show_trace_log_lvl() switches to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	 * next stack, this function will be called again with the same regs so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	 * they can be printed in the right context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	if (!partial && on_stack(info, regs, sizeof(*regs))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		__show_regs(regs, SHOW_REGS_SHORT, log_lvl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	} else if (partial && on_stack(info, (void *)regs + IRET_FRAME_OFFSET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 				       IRET_FRAME_SIZE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		 * When an interrupt or exception occurs in entry code, the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		 * full pt_regs might not have been saved yet.  In that case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		 * just print the iret frame.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		show_iret_regs(regs, log_lvl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			unsigned long *stack, const char *log_lvl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	struct unwind_state state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	struct stack_info stack_info = {0};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	unsigned long visit_mask = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	int graph_idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	bool partial = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	printk("%sCall Trace:\n", log_lvl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	unwind_start(&state, task, regs, stack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	stack = stack ? : get_stack_pointer(task, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	regs = unwind_get_entry_regs(&state, &partial);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	 * Iterate through the stacks, starting with the current stack pointer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	 * Each stack has a pointer to the next one.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	 * x86-64 can have several stacks:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	 * - task stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	 * - interrupt stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	 * - HW exception stacks (double fault, nmi, debug, mce)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	 * - entry stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	 * x86-32 can have up to four stacks:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	 * - task stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	 * - softirq stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	 * - hardirq stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	 * - entry stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	for ( ; stack; stack = PTR_ALIGN(stack_info.next_sp, sizeof(long))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		const char *stack_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		if (get_stack_info(stack, task, &stack_info, &visit_mask)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 			 * We weren't on a valid stack.  It's possible that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 			 * we overflowed a valid stack into a guard page.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 			 * See if the next page up is valid so that we can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 			 * generate some kind of backtrace if this happens.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 			stack = (unsigned long *)PAGE_ALIGN((unsigned long)stack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 			if (get_stack_info(stack, task, &stack_info, &visit_mask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		stack_name = stack_type_name(stack_info.type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		if (stack_name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 			printk("%s <%s>\n", log_lvl, stack_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		if (regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 			show_regs_if_on_stack(&stack_info, regs, partial, log_lvl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		 * Scan the stack, printing any text addresses we find.  At the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		 * same time, follow proper stack frames with the unwinder.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		 * Addresses found during the scan which are not reported by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		 * the unwinder are considered to be additional clues which are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		 * sometimes useful for debugging and are prefixed with '?'.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		 * This also serves as a failsafe option in case the unwinder
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		 * goes off in the weeds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		for (; stack < stack_info.end; stack++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 			unsigned long real_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 			int reliable = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 			unsigned long addr = READ_ONCE_NOCHECK(*stack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 			unsigned long *ret_addr_p =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 				unwind_get_return_address_ptr(&state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 			if (!__kernel_text_address(addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 			 * Don't print regs->ip again if it was already printed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 			 * by show_regs_if_on_stack().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 			if (regs && stack == &regs->ip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 				goto next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 			if (stack == ret_addr_p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 				reliable = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 			 * When function graph tracing is enabled for a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 			 * function, its return address on the stack is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 			 * replaced with the address of an ftrace handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 			 * (return_to_handler).  In that case, before printing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 			 * the "real" address, we want to print the handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 			 * address as an "unreliable" hint that function graph
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 			 * tracing was involved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 			real_addr = ftrace_graph_ret_addr(task, &graph_idx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 							  addr, stack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 			if (real_addr != addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 				printk_stack_address(addr, 0, log_lvl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 			printk_stack_address(real_addr, reliable, log_lvl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 			if (!reliable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) next:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 			 * Get the next frame from the unwinder.  No need to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 			 * check for an error: if anything goes wrong, the rest
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 			 * of the addresses will just be printed as unreliable.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 			unwind_next_frame(&state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 			/* if the frame has entry regs, print them */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 			regs = unwind_get_entry_regs(&state, &partial);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 			if (regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 				show_regs_if_on_stack(&stack_info, regs, partial, log_lvl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		if (stack_name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 			printk("%s </%s>\n", log_lvl, stack_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) void show_stack(struct task_struct *task, unsigned long *sp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		       const char *loglvl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	task = task ? : current;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	 * Stack frames below this one aren't interesting.  Don't show them
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	 * if we're printing for %current.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	if (!sp && task == current)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		sp = get_stack_pointer(current, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	show_trace_log_lvl(task, NULL, sp, loglvl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) void show_stack_regs(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	show_trace_log_lvl(current, regs, NULL, KERN_DEFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) static int die_owner = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) static unsigned int die_nest_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) unsigned long oops_begin(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	oops_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	/* racy, but better than risking deadlock. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	raw_local_irq_save(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	cpu = smp_processor_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	if (!arch_spin_trylock(&die_lock)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		if (cpu == die_owner)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 			/* nested oops. should stop eventually */;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 			arch_spin_lock(&die_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	die_nest_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	die_owner = cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	console_verbose();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	bust_spinlocks(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	return flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) NOKPROBE_SYMBOL(oops_begin);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) void __noreturn rewind_stack_do_exit(int signr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) void oops_end(unsigned long flags, struct pt_regs *regs, int signr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	if (regs && kexec_should_crash(current))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		crash_kexec(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	bust_spinlocks(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	die_owner = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	die_nest_count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	if (!die_nest_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 		/* Nest count reaches zero, release the lock. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 		arch_spin_unlock(&die_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	raw_local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	oops_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	/* Executive summary in case the oops scrolled away */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	__show_regs(&exec_summary_regs, SHOW_REGS_ALL, KERN_DEFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	if (!signr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	if (in_interrupt())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		panic("Fatal exception in interrupt");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	if (panic_on_oops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 		panic("Fatal exception");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	 * We're not going to return, but we might be on an IST stack or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	 * have very little stack space left.  Rewind the stack and kill
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	 * the task.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	 * Before we rewind the stack, we have to tell KASAN that we're going to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	 * reuse the task stack and that existing poisons are invalid.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	kasan_unpoison_task_stack(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	rewind_stack_do_exit(signr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) NOKPROBE_SYMBOL(oops_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) static void __die_header(const char *str, struct pt_regs *regs, long err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 	const char *pr = "";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	/* Save the regs of the first oops for the executive summary later. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 	if (!die_counter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 		exec_summary_regs = *regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	if (IS_ENABLED(CONFIG_PREEMPTION))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 		pr = IS_ENABLED(CONFIG_PREEMPT_RT) ? " PREEMPT_RT" : " PREEMPT";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 	printk(KERN_DEFAULT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	       "%s: %04lx [#%d]%s%s%s%s%s\n", str, err & 0xffff, ++die_counter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	       pr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	       IS_ENABLED(CONFIG_SMP)     ? " SMP"             : "",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 	       debug_pagealloc_enabled()  ? " DEBUG_PAGEALLOC" : "",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 	       IS_ENABLED(CONFIG_KASAN)   ? " KASAN"           : "",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	       IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 	       (boot_cpu_has(X86_FEATURE_PTI) ? " PTI" : " NOPTI") : "");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) NOKPROBE_SYMBOL(__die_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) static int __die_body(const char *str, struct pt_regs *regs, long err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 	show_regs(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 	print_modules();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	if (notify_die(DIE_OOPS, str, regs, err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 			current->thread.trap_nr, SIGSEGV) == NOTIFY_STOP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) NOKPROBE_SYMBOL(__die_body);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) int __die(const char *str, struct pt_regs *regs, long err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 	__die_header(str, regs, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 	return __die_body(str, regs, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) NOKPROBE_SYMBOL(__die);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)  * This is gone through when something in the kernel has done something bad
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437)  * and is about to be terminated:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) void die(const char *str, struct pt_regs *regs, long err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 	unsigned long flags = oops_begin();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 	int sig = SIGSEGV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 	if (__die(str, regs, err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 		sig = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 	oops_end(flags, regs, sig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) void die_addr(const char *str, struct pt_regs *regs, long err, long gp_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 	unsigned long flags = oops_begin();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 	int sig = SIGSEGV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 	__die_header(str, regs, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) 	if (gp_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) 		kasan_non_canonical_hook(gp_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 	if (__die_body(str, regs, err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) 		sig = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 	oops_end(flags, regs, sig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) void show_regs(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) 	enum show_regs_mode print_kernel_regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) 	show_regs_print_info(KERN_DEFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) 	print_kernel_regs = user_mode(regs) ? SHOW_REGS_USER : SHOW_REGS_ALL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) 	__show_regs(regs, print_kernel_regs, KERN_DEFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) 	 * When in-kernel, we also print out the stack at the time of the fault..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) 	if (!user_mode(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) 		show_trace_log_lvl(current, regs, NULL, KERN_DEFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) }