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9c0729dc80
The various stack tracing routines take a 'bp' argument in which the caller is supposed to provide the base pointer to use, or 0 if doesn't have one. Since bp is garbage whenever CONFIG_FRAME_POINTER is not defined, this means all callers in principle should either always pass 0, or be conditional on CONFIG_FRAME_POINTER. However, there are only really three use cases for stack tracing: (a) Trace the current task, including IRQ stack if any (b) Trace the current task, but skip IRQ stack (c) Trace some other task In all cases, if CONFIG_FRAME_POINTER is not defined, bp should just be 0. If it _is_ defined, then - in case (a) bp should be gotten directly from the CPU's register, so the caller should pass NULL for regs, - in case (b) the caller should should pass the IRQ registers to dump_trace(), - in case (c) bp should be gotten from the top of the task's stack, so the caller should pass NULL for regs. Hence, the bp argument is not necessary because the combination of task and regs is sufficient to determine an appropriate value for bp. This patch introduces a new inline function stack_frame(task, regs) that computes the desired bp. This function is then called from the two versions of dump_stack(). Signed-off-by: Soren Sandmann <ssp@redhat.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arjan van de Ven <arjan@infradead.org>, Cc: Frederic Weisbecker <fweisbec@gmail.com>, Cc: Arnaldo Carvalho de Melo <acme@redhat.com>, LKML-Reference: <m3oc9rop28.fsf@dhcp-100-3-82.bos.redhat.com>> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
122 lines
2.8 KiB
C
122 lines
2.8 KiB
C
/*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
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*/
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#ifndef _ASM_X86_STACKTRACE_H
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#define _ASM_X86_STACKTRACE_H
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#include <linux/uaccess.h>
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#include <linux/ptrace.h>
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extern int kstack_depth_to_print;
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struct thread_info;
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struct stacktrace_ops;
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typedef unsigned long (*walk_stack_t)(struct thread_info *tinfo,
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unsigned long *stack,
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unsigned long bp,
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const struct stacktrace_ops *ops,
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void *data,
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unsigned long *end,
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int *graph);
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extern unsigned long
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print_context_stack(struct thread_info *tinfo,
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unsigned long *stack, unsigned long bp,
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const struct stacktrace_ops *ops, void *data,
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unsigned long *end, int *graph);
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extern unsigned long
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print_context_stack_bp(struct thread_info *tinfo,
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unsigned long *stack, unsigned long bp,
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const struct stacktrace_ops *ops, void *data,
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unsigned long *end, int *graph);
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/* Generic stack tracer with callbacks */
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struct stacktrace_ops {
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void (*warning)(void *data, char *msg);
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/* msg must contain %s for the symbol */
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void (*warning_symbol)(void *data, char *msg, unsigned long symbol);
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void (*address)(void *data, unsigned long address, int reliable);
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/* On negative return stop dumping */
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int (*stack)(void *data, char *name);
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walk_stack_t walk_stack;
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};
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void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
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unsigned long *stack,
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const struct stacktrace_ops *ops, void *data);
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#ifdef CONFIG_X86_32
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#define STACKSLOTS_PER_LINE 8
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#define get_bp(bp) asm("movl %%ebp, %0" : "=r" (bp) :)
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#else
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#define STACKSLOTS_PER_LINE 4
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#define get_bp(bp) asm("movq %%rbp, %0" : "=r" (bp) :)
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#endif
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#ifdef CONFIG_FRAME_POINTER
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static inline unsigned long
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stack_frame(struct task_struct *task, struct pt_regs *regs)
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{
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unsigned long bp;
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if (regs)
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return regs->bp;
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if (task == current) {
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/* Grab bp right from our regs */
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get_bp(bp);
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return bp;
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}
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/* bp is the last reg pushed by switch_to */
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return *(unsigned long *)task->thread.sp;
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}
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#else
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static inline unsigned long
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stack_frame(struct task_struct *task, struct pt_regs *regs)
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{
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return 0;
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}
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#endif
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extern void
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show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
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unsigned long *stack, char *log_lvl);
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extern void
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show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
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unsigned long *sp, char *log_lvl);
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extern unsigned int code_bytes;
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/* The form of the top of the frame on the stack */
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struct stack_frame {
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struct stack_frame *next_frame;
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unsigned long return_address;
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};
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struct stack_frame_ia32 {
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u32 next_frame;
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u32 return_address;
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};
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static inline unsigned long caller_frame_pointer(void)
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{
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struct stack_frame *frame;
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get_bp(frame);
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#ifdef CONFIG_FRAME_POINTER
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frame = frame->next_frame;
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#endif
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return (unsigned long)frame;
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}
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#endif /* _ASM_X86_STACKTRACE_H */
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