diff options
| -rw-r--r-- | arch/x86/kernel/traps_64.c | 67 |
1 files changed, 44 insertions, 23 deletions
diff --git a/arch/x86/kernel/traps_64.c b/arch/x86/kernel/traps_64.c index b8303ed9505..304ca6b4a1c 100644 --- a/arch/x86/kernel/traps_64.c +++ b/arch/x86/kernel/traps_64.c @@ -225,31 +225,34 @@ static inline int valid_stack_ptr(struct thread_info *tinfo, return p > t && p < t + THREAD_SIZE - size; } +/* The form of the top of the frame on the stack */ +struct stack_frame { + struct stack_frame *next_frame; + unsigned long return_address; +}; + + static inline unsigned long print_context_stack(struct thread_info *tinfo, unsigned long *stack, unsigned long bp, const struct stacktrace_ops *ops, void *data, unsigned long *end) { - /* - * Print function call entries within a stack. 'cond' is the - * "end of stackframe" condition, that the 'stack++' - * iteration will eventually trigger. - */ - while (valid_stack_ptr(tinfo, stack, 3, end)) { - unsigned long addr = *stack++; - /* Use unlocked access here because except for NMIs - we should be already protected against module unloads */ + struct stack_frame *frame = (struct stack_frame *)bp; + + while (valid_stack_ptr(tinfo, stack, sizeof(*stack), end)) { + unsigned long addr; + + addr = *stack; if (__kernel_text_address(addr)) { - /* - * If the address is either in the text segment of the - * kernel, or in the region which contains vmalloc'ed - * memory, it *may* be the address of a calling - * routine; if so, print it so that someone tracing - * down the cause of the crash will be able to figure - * out the call path that was taken. - */ - ops->address(data, addr, 1); + if ((unsigned long) stack == bp + 8) { + ops->address(data, addr, 1); + frame = frame->next_frame; + bp = (unsigned long) frame; + } else { + ops->address(data, addr, bp == 0); + } } + stack++; } return bp; } @@ -274,6 +277,19 @@ void dump_trace(struct task_struct *tsk, struct pt_regs *regs, stack = (unsigned long *)tsk->thread.sp; } +#ifdef CONFIG_FRAME_POINTER + if (!bp) { + if (tsk == current) { + /* Grab bp right from our regs */ + asm("movq %%rbp, %0" : "=r" (bp):); + } else { + /* bp is the last reg pushed by switch_to */ + bp = *(unsigned long *) tsk->thread.sp; + } + } +#endif + + /* * Print function call entries in all stacks, starting at the @@ -290,8 +306,8 @@ void dump_trace(struct task_struct *tsk, struct pt_regs *regs, if (ops->stack(data, id) < 0) break; - print_context_stack(tinfo, stack, 0, ops, - data, estack_end); + bp = print_context_stack(tinfo, stack, bp, ops, + data, estack_end); ops->stack(data, "<EOE>"); /* * We link to the next stack via the @@ -309,8 +325,8 @@ void dump_trace(struct task_struct *tsk, struct pt_regs *regs, if (stack >= irqstack && stack < irqstack_end) { if (ops->stack(data, "IRQ") < 0) break; - print_context_stack(tinfo, stack, 0, ops, - data, irqstack_end); + bp = print_context_stack(tinfo, stack, bp, + ops, data, irqstack_end); /* * We link to the next stack (which would be * the process stack normally) the last @@ -328,7 +344,7 @@ void dump_trace(struct task_struct *tsk, struct pt_regs *regs, /* * This handles the process stack: */ - print_context_stack(tinfo, stack, 0, ops, data, NULL); + bp = print_context_stack(tinfo, stack, bp, ops, data, NULL); put_cpu(); } EXPORT_SYMBOL(dump_trace); @@ -425,6 +441,11 @@ void dump_stack(void) unsigned long dummy; unsigned long bp = 0; +#ifdef CONFIG_FRAME_POINTER + if (!bp) + asm("movq %%rbp, %0" : "=r" (bp):); +#endif + printk("Pid: %d, comm: %.20s %s %s %.*s\n", current->pid, current->comm, print_tainted(), init_utsname()->release, |