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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225// 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/asm-offsets.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 stack){ if (sp < stack || sp >= stack + THREAD_SIZE) return false; info->type = type; info->begin = stack; info->end = stack + THREAD_SIZE; return true;}
static bool in_task_stack(unsigned long sp, struct task_struct *task, struct stack_info *info){ unsigned long stack = (unsigned long)task_stack_page(task);
return in_stack(sp, info, STACK_TYPE_TASK, stack);}
static bool in_irq_stack(unsigned long sp, struct stack_info *info){ unsigned long stack = get_lowcore()->async_stack - STACK_INIT_OFFSET;
return in_stack(sp, info, STACK_TYPE_IRQ, stack);}
static bool in_nodat_stack(unsigned long sp, struct stack_info *info){ unsigned long stack = get_lowcore()->nodat_stack - STACK_INIT_OFFSET;
return in_stack(sp, info, STACK_TYPE_NODAT, stack);}
static bool in_mcck_stack(unsigned long sp, struct stack_info *info){ unsigned long stack = get_lowcore()->mcck_stack - STACK_INIT_OFFSET;
return in_stack(sp, info, STACK_TYPE_MCCK, stack);}
static bool in_restart_stack(unsigned long sp, struct stack_info *info){ unsigned long stack = get_lowcore()->restart_stack - STACK_INIT_OFFSET;
return in_stack(sp, info, STACK_TYPE_RESTART, stack);}
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) && !in_mcck_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>] ", regs->last_break); if (user_mode(regs)) { print_vma_addr(KERN_CONT, regs->last_break); pr_cont("\n"); } else { pr_cont("%pSR\n", (void *)regs->last_break); }}
void show_registers(struct pt_regs *regs){ struct psw_bits *psw = &psw_bits(regs->psw); unsigned long pswaddr; char *mode;
pswaddr = regs->psw.addr; if (test_pt_regs_flag(regs, PIF_PSW_ADDR_ADJUSTED)) pswaddr = __forward_psw(regs->psw, regs->int_code >> 16); mode = user_mode(regs) ? "User" : "Krnl"; printk("%s PSW : %px %px", mode, (void *)regs->psw.mask, (void *)pswaddr); if (!user_mode(regs)) pr_cont(" (%pSR)", (void *)pswaddr); 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 __noreturn 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); 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(); make_task_dead(SIGSEGV);}