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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 | // 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_mcck_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.mcck_stack + frame_size; return in_stack(sp, info, STACK_TYPE_MCCK, 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) && !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>] %pSR\n", regs->last_break, (void *)regs->last_break); } 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 __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); #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(); make_task_dead(SIGSEGV); } |