ea424055b7
The unwinder fallback logic still had potential for falling through to the legacy stack trace code without printing an indication (at once serving as a separator) of this. Further, the stack pointer retrieval for the fallback should be as restrictive as possible (in order to avoid having the legacy stack tracer try to access invalid memory). The patch tightens that, but this could certainly be further improved. Also making the call_trace command line option now conditional upon CONFIG_STACK_UNWIND (as it's meaningless otherwise). Signed-off-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
#ifndef _ASM_X86_64_UNWIND_H
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#define _ASM_X86_64_UNWIND_H
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/*
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* Copyright (C) 2002-2006 Novell, Inc.
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* Jan Beulich <jbeulich@novell.com>
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* This code is released under version 2 of the GNU GPL.
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*/
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#ifdef CONFIG_STACK_UNWIND
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#include <linux/sched.h>
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#include <asm/ptrace.h>
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#include <asm/uaccess.h>
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#include <asm/vsyscall.h>
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struct unwind_frame_info
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{
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struct pt_regs regs;
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struct task_struct *task;
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};
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#define UNW_PC(frame) (frame)->regs.rip
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#define UNW_SP(frame) (frame)->regs.rsp
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#ifdef CONFIG_FRAME_POINTER
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#define UNW_FP(frame) (frame)->regs.rbp
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#define FRAME_RETADDR_OFFSET 8
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#define FRAME_LINK_OFFSET 0
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#define STACK_BOTTOM(tsk) (((tsk)->thread.rsp0 - 1) & ~(THREAD_SIZE - 1))
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#define STACK_TOP(tsk) ((tsk)->thread.rsp0)
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#endif
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/* Might need to account for the special exception and interrupt handling
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stacks here, since normally
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EXCEPTION_STACK_ORDER < THREAD_ORDER < IRQSTACK_ORDER,
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but the construct is needed only for getting across the stack switch to
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the interrupt stack - thus considering the IRQ stack itself is unnecessary,
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and the overhead of comparing against all exception handling stacks seems
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not desirable. */
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#define STACK_LIMIT(ptr) (((ptr) - 1) & ~(THREAD_SIZE - 1))
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#define UNW_REGISTER_INFO \
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PTREGS_INFO(rax), \
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PTREGS_INFO(rdx), \
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PTREGS_INFO(rcx), \
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PTREGS_INFO(rbx), \
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PTREGS_INFO(rsi), \
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PTREGS_INFO(rdi), \
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PTREGS_INFO(rbp), \
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PTREGS_INFO(rsp), \
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PTREGS_INFO(r8), \
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PTREGS_INFO(r9), \
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PTREGS_INFO(r10), \
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PTREGS_INFO(r11), \
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PTREGS_INFO(r12), \
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PTREGS_INFO(r13), \
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PTREGS_INFO(r14), \
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PTREGS_INFO(r15), \
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PTREGS_INFO(rip)
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static inline void arch_unw_init_frame_info(struct unwind_frame_info *info,
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/*const*/ struct pt_regs *regs)
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{
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info->regs = *regs;
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}
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static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
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{
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extern const char thread_return[];
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memset(&info->regs, 0, sizeof(info->regs));
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info->regs.rip = (unsigned long)thread_return;
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info->regs.cs = __KERNEL_CS;
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__get_user(info->regs.rbp, (unsigned long *)info->task->thread.rsp);
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info->regs.rsp = info->task->thread.rsp;
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info->regs.ss = __KERNEL_DS;
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}
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extern int arch_unwind_init_running(struct unwind_frame_info *,
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int (*callback)(struct unwind_frame_info *,
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void *arg),
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void *arg);
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static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
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{
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#if 0 /* This can only work when selector register saves/restores
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are properly annotated (and tracked in UNW_REGISTER_INFO). */
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return user_mode(&info->regs);
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#else
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return (long)info->regs.rip >= 0
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|| (info->regs.rip >= VSYSCALL_START && info->regs.rip < VSYSCALL_END)
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|| (long)info->regs.rsp >= 0;
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#endif
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}
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#else
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#define UNW_PC(frame) ((void)(frame), 0)
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#define UNW_SP(frame) ((void)(frame), 0)
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static inline int arch_unw_user_mode(const void *info)
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{
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return 0;
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}
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#endif
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#endif /* _ASM_X86_64_UNWIND_H */
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