128 lines
2.6 KiB
C
128 lines
2.6 KiB
C
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/**
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* @file backtrace.c
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*
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* @remark Copyright 2002 OProfile authors
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* @remark Read the file COPYING
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*
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* @author John Levon
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* @author David Smith
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*/
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#include <linux/oprofile.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/compat.h>
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#include <linux/uaccess.h>
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#include <asm/ptrace.h>
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#include <asm/stacktrace.h>
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#include <asm/unwind.h>
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#ifdef CONFIG_COMPAT
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static struct stack_frame_ia32 *
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dump_user_backtrace_32(struct stack_frame_ia32 *head)
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{
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/* Also check accessibility of one struct frame_head beyond: */
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struct stack_frame_ia32 bufhead[2];
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struct stack_frame_ia32 *fp;
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unsigned long bytes;
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bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead));
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if (bytes != 0)
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return NULL;
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fp = (struct stack_frame_ia32 *) compat_ptr(bufhead[0].next_frame);
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oprofile_add_trace(bufhead[0].return_address);
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/* frame pointers should strictly progress back up the stack
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* (towards higher addresses) */
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if (head >= fp)
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return NULL;
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return fp;
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}
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static inline int
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x86_backtrace_32(struct pt_regs * const regs, unsigned int depth)
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{
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struct stack_frame_ia32 *head;
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/* User process is IA32 */
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if (!current || !test_thread_flag(TIF_IA32))
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return 0;
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head = (struct stack_frame_ia32 *) regs->bp;
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while (depth-- && head)
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head = dump_user_backtrace_32(head);
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return 1;
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}
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#else
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static inline int
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x86_backtrace_32(struct pt_regs * const regs, unsigned int depth)
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{
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return 0;
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}
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#endif /* CONFIG_COMPAT */
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static struct stack_frame *dump_user_backtrace(struct stack_frame *head)
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{
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/* Also check accessibility of one struct frame_head beyond: */
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struct stack_frame bufhead[2];
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unsigned long bytes;
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bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead));
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if (bytes != 0)
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return NULL;
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oprofile_add_trace(bufhead[0].return_address);
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/* frame pointers should strictly progress back up the stack
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* (towards higher addresses) */
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if (head >= bufhead[0].next_frame)
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return NULL;
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return bufhead[0].next_frame;
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}
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void
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x86_backtrace(struct pt_regs * const regs, unsigned int depth)
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{
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struct stack_frame *head = (struct stack_frame *)frame_pointer(regs);
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if (!user_mode(regs)) {
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struct unwind_state state;
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unsigned long addr;
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if (!depth)
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return;
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oprofile_add_trace(regs->ip);
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if (!--depth)
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return;
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for (unwind_start(&state, current, regs, NULL);
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!unwind_done(&state); unwind_next_frame(&state)) {
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addr = unwind_get_return_address(&state);
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if (!addr)
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break;
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oprofile_add_trace(addr);
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if (!--depth)
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break;
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}
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return;
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}
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if (x86_backtrace_32(regs, depth))
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return;
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while (depth-- && head)
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head = dump_user_backtrace(head);
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}
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