forked from luck/tmp_suning_uos_patched
s390/dumpstack: fix call chain walking
dumpstack() did not always print a sane callchain when being called. The reason is that show_trace() accessed register 15 directly to get the current stack pointer and passed that pointer to __show_trace() which expects a valid stack frame pointer as argument. However due to tail call optimization the stack frame may not exist anymore when __show_trace() gets called and therefore an invalid stack frame pointer gets passed. To prevent that disable tail call optimization for call chain walking functions. So move all the show_* functions to a dumpstack.c file like other architectures have it already and add a -fno-optimize-sibling-calls compile flag to both dumpstack.c and stacktrace.c to prevent tail call optimization. Fixes callchains that looked e.g. like this: [ 12.868258] Call Trace: [ 12.868262] ([<0000000000008000>] 0x8000) Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
Martin Schwidefsky
parent
2b55732ad2
commit
1bca09f714
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@ -13,6 +13,14 @@ endif
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#
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CFLAGS_smp.o := -Wno-nonnull
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#
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# Disable tailcall optimizations for stack / callchain walking functions
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# since this might generate broken code when accessing register 15 and
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# passing its content to other functions.
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#
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CFLAGS_stacktrace.o += -fno-optimize-sibling-calls
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CFLAGS_dumpstack.o += -fno-optimize-sibling-calls
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#
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# Pass UTS_MACHINE for user_regset definition
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#
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@ -20,10 +28,11 @@ CFLAGS_ptrace.o += -DUTS_MACHINE='"$(UTS_MACHINE)"'
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CFLAGS_sysinfo.o += -Iinclude/math-emu -Iarch/s390/math-emu -w
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obj-y := bitmap.o traps.o time.o process.o base.o early.o setup.o vtime.o \
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processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o \
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debug.o irq.o ipl.o dis.o diag.o mem_detect.o sclp.o vdso.o \
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sysinfo.o jump_label.o lgr.o os_info.o machine_kexec.o pgm_check.o
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obj-y := bitmap.o traps.o time.o process.o base.o early.o setup.o vtime.o
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obj-y += processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o
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obj-y += debug.o irq.o ipl.o dis.o diag.o mem_detect.o sclp.o vdso.o
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obj-y += sysinfo.o jump_label.o lgr.o os_info.o machine_kexec.o pgm_check.o
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obj-y += dumpstack.o
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obj-y += $(if $(CONFIG_64BIT),entry64.o,entry.o)
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obj-y += $(if $(CONFIG_64BIT),reipl64.o,reipl.o)
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236
arch/s390/kernel/dumpstack.c
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236
arch/s390/kernel/dumpstack.c
Normal file
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@ -0,0 +1,236 @@
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/*
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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/module.h>
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#include <linux/sched.h>
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#include <asm/processor.h>
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#include <asm/debug.h>
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#include <asm/ipl.h>
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#ifndef CONFIG_64BIT
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#define LONG "%08lx "
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#define FOURLONG "%08lx %08lx %08lx %08lx\n"
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static int kstack_depth_to_print = 12;
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#else /* CONFIG_64BIT */
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#define LONG "%016lx "
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#define FOURLONG "%016lx %016lx %016lx %016lx\n"
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static int kstack_depth_to_print = 20;
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#endif /* CONFIG_64BIT */
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/*
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* For show_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 stack 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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__show_trace(unsigned long sp, 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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sp = sp & PSW_ADDR_INSN;
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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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printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
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print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN);
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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 & PSW_ADDR_INSN;
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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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printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
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print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN);
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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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printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN);
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print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN);
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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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static void show_trace(struct task_struct *task, unsigned long *stack)
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{
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register unsigned long __r15 asm ("15");
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unsigned long sp;
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sp = (unsigned long) stack;
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if (!sp)
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sp = task ? task->thread.ksp : __r15;
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printk("Call Trace:\n");
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#ifdef CONFIG_CHECK_STACK
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sp = __show_trace(sp, S390_lowcore.panic_stack - 4096,
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S390_lowcore.panic_stack);
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#endif
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sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE,
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S390_lowcore.async_stack);
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if (task)
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__show_trace(sp, (unsigned long) task_stack_page(task),
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(unsigned long) task_stack_page(task) + THREAD_SIZE);
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else
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__show_trace(sp, S390_lowcore.thread_info,
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S390_lowcore.thread_info + THREAD_SIZE);
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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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void show_stack(struct task_struct *task, unsigned long *sp)
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{
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register unsigned long *__r15 asm ("15");
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unsigned long *stack;
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int i;
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if (!sp)
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stack = task ? (unsigned long *) task->thread.ksp : __r15;
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else
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stack = sp;
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for (i = 0; i < kstack_depth_to_print; i++) {
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if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
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break;
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if ((i * sizeof(long) % 32) == 0)
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printk("%s ", i == 0 ? "" : "\n");
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printk(LONG, *stack++);
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}
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printk("\n");
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show_trace(task, sp);
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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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#ifdef CONFIG_64BIT
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printk("Last Breaking-Event-Address:\n");
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printk(" [<%016lx>] ", regs->args[0] & PSW_ADDR_INSN);
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print_symbol("%s\n", regs->args[0] & PSW_ADDR_INSN);
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#endif
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}
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/*
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* The architecture-independent dump_stack generator
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*/
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void dump_stack(void)
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{
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printk("CPU: %d %s %s %.*s\n",
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task_thread_info(current)->cpu, print_tainted(),
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init_utsname()->release,
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(int)strcspn(init_utsname()->version, " "),
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init_utsname()->version);
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printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
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current->comm, current->pid, current,
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(void *) current->thread.ksp);
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show_stack(NULL, NULL);
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}
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EXPORT_SYMBOL(dump_stack);
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static inline int mask_bits(struct pt_regs *regs, unsigned long bits)
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{
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return (regs->psw.mask & bits) / ((~bits + 1) & bits);
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}
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void show_registers(struct pt_regs *regs)
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{
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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",
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mode, (void *) regs->psw.mask,
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(void *) regs->psw.addr);
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print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN);
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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", mask_bits(regs, PSW_MASK_PER),
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mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO),
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mask_bits(regs, PSW_MASK_EXT), mask_bits(regs, PSW_MASK_KEY),
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mask_bits(regs, PSW_MASK_MCHECK), mask_bits(regs, PSW_MASK_WAIT),
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mask_bits(regs, PSW_MASK_PSTATE), mask_bits(regs, PSW_MASK_ASC),
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mask_bits(regs, PSW_MASK_CC), mask_bits(regs, PSW_MASK_PM));
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#ifdef CONFIG_64BIT
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printk(" EA:%x", mask_bits(regs, PSW_MASK_EA | PSW_MASK_BA));
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#endif
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printk("\n%s GPRS: " FOURLONG, mode,
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regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
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printk(" " FOURLONG,
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regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
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printk(" " FOURLONG,
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regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
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printk(" " FOURLONG,
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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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printk("CPU: %d %s %s %.*s\n",
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task_thread_info(current)->cpu, print_tainted(),
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init_utsname()->release,
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(int)strcspn(init_utsname()->version, " "),
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init_utsname()->version);
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printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
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current->comm, current->pid, current,
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(void *) current->thread.ksp);
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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_trace(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 [#%d] ", str, regs->int_code & 0xffff, ++die_counter);
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#ifdef CONFIG_PREEMPT
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printk("PREEMPT ");
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#endif
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#ifdef CONFIG_SMP
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printk("SMP ");
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#endif
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#ifdef CONFIG_DEBUG_PAGEALLOC
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printk("DEBUG_PAGEALLOC");
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#endif
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printk("\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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@ -12,49 +12,16 @@
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* 'Traps.c' handles hardware traps and faults after we have saved some
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* state in 'asm.s'.
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*/
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/seq_file.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/kdebug.h>
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#include <linux/kallsyms.h>
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#include <linux/reboot.h>
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#include <linux/kprobes.h>
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#include <linux/bug.h>
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#include <linux/utsname.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#include <linux/atomic.h>
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#include <asm/mathemu.h>
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#include <asm/cpcmd.h>
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#include <asm/lowcore.h>
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#include <asm/debug.h>
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#include <asm/ipl.h>
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#include <linux/kdebug.h>
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#include <linux/module.h>
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#include <linux/ptrace.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include "entry.h"
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int show_unhandled_signals = 1;
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#define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; })
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#ifndef CONFIG_64BIT
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#define LONG "%08lx "
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#define FOURLONG "%08lx %08lx %08lx %08lx\n"
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static int kstack_depth_to_print = 12;
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#else /* CONFIG_64BIT */
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#define LONG "%016lx "
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#define FOURLONG "%016lx %016lx %016lx %016lx\n"
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static int kstack_depth_to_print = 20;
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#endif /* CONFIG_64BIT */
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static inline void __user *get_trap_ip(struct pt_regs *regs)
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{
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#ifdef CONFIG_64BIT
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@ -72,215 +39,6 @@ static inline void __user *get_trap_ip(struct pt_regs *regs)
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#endif
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}
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/*
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* For show_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 stack 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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__show_trace(unsigned long sp, 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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sp = sp & PSW_ADDR_INSN;
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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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printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
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print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN);
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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 & PSW_ADDR_INSN;
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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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printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
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print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN);
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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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printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN);
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print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN);
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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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static void show_trace(struct task_struct *task, unsigned long *stack)
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{
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register unsigned long __r15 asm ("15");
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unsigned long sp;
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sp = (unsigned long) stack;
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if (!sp)
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sp = task ? task->thread.ksp : __r15;
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printk("Call Trace:\n");
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#ifdef CONFIG_CHECK_STACK
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sp = __show_trace(sp, S390_lowcore.panic_stack - 4096,
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S390_lowcore.panic_stack);
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#endif
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sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE,
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S390_lowcore.async_stack);
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if (task)
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__show_trace(sp, (unsigned long) task_stack_page(task),
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(unsigned long) task_stack_page(task) + THREAD_SIZE);
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else
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__show_trace(sp, S390_lowcore.thread_info,
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S390_lowcore.thread_info + THREAD_SIZE);
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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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void show_stack(struct task_struct *task, unsigned long *sp)
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{
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register unsigned long * __r15 asm ("15");
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unsigned long *stack;
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int i;
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if (!sp)
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stack = task ? (unsigned long *) task->thread.ksp : __r15;
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else
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stack = sp;
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for (i = 0; i < kstack_depth_to_print; i++) {
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if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
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||||
break;
|
||||
if ((i * sizeof(long) % 32) == 0)
|
||||
printk("%s ", i == 0 ? "" : "\n");
|
||||
printk(LONG, *stack++);
|
||||
}
|
||||
printk("\n");
|
||||
show_trace(task, sp);
|
||||
}
|
||||
|
||||
static void show_last_breaking_event(struct pt_regs *regs)
|
||||
{
|
||||
#ifdef CONFIG_64BIT
|
||||
printk("Last Breaking-Event-Address:\n");
|
||||
printk(" [<%016lx>] ", regs->args[0] & PSW_ADDR_INSN);
|
||||
print_symbol("%s\n", regs->args[0] & PSW_ADDR_INSN);
|
||||
#endif
|
||||
}
|
||||
|
||||
/*
|
||||
* The architecture-independent dump_stack generator
|
||||
*/
|
||||
void dump_stack(void)
|
||||
{
|
||||
printk("CPU: %d %s %s %.*s\n",
|
||||
task_thread_info(current)->cpu, print_tainted(),
|
||||
init_utsname()->release,
|
||||
(int)strcspn(init_utsname()->version, " "),
|
||||
init_utsname()->version);
|
||||
printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
|
||||
current->comm, current->pid, current,
|
||||
(void *) current->thread.ksp);
|
||||
show_stack(NULL, NULL);
|
||||
}
|
||||
EXPORT_SYMBOL(dump_stack);
|
||||
|
||||
static inline int mask_bits(struct pt_regs *regs, unsigned long bits)
|
||||
{
|
||||
return (regs->psw.mask & bits) / ((~bits + 1) & bits);
|
||||
}
|
||||
|
||||
void show_registers(struct pt_regs *regs)
|
||||
{
|
||||
char *mode;
|
||||
|
||||
mode = user_mode(regs) ? "User" : "Krnl";
|
||||
printk("%s PSW : %p %p",
|
||||
mode, (void *) regs->psw.mask,
|
||||
(void *) regs->psw.addr);
|
||||
print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN);
|
||||
printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
|
||||
"P:%x AS:%x CC:%x PM:%x", mask_bits(regs, PSW_MASK_PER),
|
||||
mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO),
|
||||
mask_bits(regs, PSW_MASK_EXT), mask_bits(regs, PSW_MASK_KEY),
|
||||
mask_bits(regs, PSW_MASK_MCHECK), mask_bits(regs, PSW_MASK_WAIT),
|
||||
mask_bits(regs, PSW_MASK_PSTATE), mask_bits(regs, PSW_MASK_ASC),
|
||||
mask_bits(regs, PSW_MASK_CC), mask_bits(regs, PSW_MASK_PM));
|
||||
#ifdef CONFIG_64BIT
|
||||
printk(" EA:%x", mask_bits(regs, PSW_MASK_EA | PSW_MASK_BA));
|
||||
#endif
|
||||
printk("\n%s GPRS: " FOURLONG, mode,
|
||||
regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
|
||||
printk(" " FOURLONG,
|
||||
regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
|
||||
printk(" " FOURLONG,
|
||||
regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
|
||||
printk(" " FOURLONG,
|
||||
regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
|
||||
|
||||
show_code(regs);
|
||||
}
|
||||
|
||||
void show_regs(struct pt_regs *regs)
|
||||
{
|
||||
printk("CPU: %d %s %s %.*s\n",
|
||||
task_thread_info(current)->cpu, print_tainted(),
|
||||
init_utsname()->release,
|
||||
(int)strcspn(init_utsname()->version, " "),
|
||||
init_utsname()->version);
|
||||
printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
|
||||
current->comm, current->pid, current,
|
||||
(void *) current->thread.ksp);
|
||||
show_registers(regs);
|
||||
/* Show stack backtrace if pt_regs is from kernel mode */
|
||||
if (!user_mode(regs))
|
||||
show_trace(NULL, (unsigned long *) regs->gprs[15]);
|
||||
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 [#%d] ", str, regs->int_code & 0xffff, ++die_counter);
|
||||
#ifdef CONFIG_PREEMPT
|
||||
printk("PREEMPT ");
|
||||
#endif
|
||||
#ifdef CONFIG_SMP
|
||||
printk("SMP ");
|
||||
#endif
|
||||
#ifdef CONFIG_DEBUG_PAGEALLOC
|
||||
printk("DEBUG_PAGEALLOC");
|
||||
#endif
|
||||
printk("\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);
|
||||
}
|
||||
|
||||
static inline void report_user_fault(struct pt_regs *regs, int signr)
|
||||
{
|
||||
if ((task_pid_nr(current) > 1) && !show_unhandled_signals)
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user