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568b329a02
. avoid walking the stack when there is no room left in the buffer . generalize get_perf_callchain() to be called from bpf helper Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
119 lines
2.7 KiB
C
119 lines
2.7 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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int (*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, unsigned long bp,
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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, unsigned long bp, 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, unsigned long bp, 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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