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[PATCH] x86_64: reliable stack trace support (x86-64)
These are the x86_64-specific pieces to enable reliable stack traces. The only restriction with this is that it currently cannot unwind across the interrupt->normal stack boundary, as that transition is lacking proper annotation. Signed-off-by: Jan Beulich <[email protected]> Signed-off-by: Andi Kleen <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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Jan Beulich
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Linus Torvalds
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Jun 26, 2006
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Original file line number | Diff line number | Diff line change |
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#ifndef _ASM_X86_64_UNWIND_H | ||
#define _ASM_X86_64_UNWIND_H | ||
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/* | ||
* Copyright (C) 2002-2006 Novell, Inc. | ||
* Jan Beulich <[email protected]> | ||
* This code is released under version 2 of the GNU GPL. | ||
*/ | ||
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#ifdef CONFIG_STACK_UNWIND | ||
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#include <linux/sched.h> | ||
#include <asm/ptrace.h> | ||
#include <asm/uaccess.h> | ||
#include <asm/vsyscall.h> | ||
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struct unwind_frame_info | ||
{ | ||
struct pt_regs regs; | ||
struct task_struct *task; | ||
}; | ||
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#define UNW_PC(frame) (frame)->regs.rip | ||
#define UNW_SP(frame) (frame)->regs.rsp | ||
#ifdef CONFIG_FRAME_POINTER | ||
#define UNW_FP(frame) (frame)->regs.rbp | ||
#define FRAME_RETADDR_OFFSET 8 | ||
#define FRAME_LINK_OFFSET 0 | ||
#define STACK_BOTTOM(tsk) (((tsk)->thread.rsp0 - 1) & ~(THREAD_SIZE - 1)) | ||
#define STACK_TOP(tsk) ((tsk)->thread.rsp0) | ||
#endif | ||
/* Might need to account for the special exception and interrupt handling | ||
stacks here, since normally | ||
EXCEPTION_STACK_ORDER < THREAD_ORDER < IRQSTACK_ORDER, | ||
but the construct is needed only for getting across the stack switch to | ||
the interrupt stack - thus considering the IRQ stack itself is unnecessary, | ||
and the overhead of comparing against all exception handling stacks seems | ||
not desirable. */ | ||
#define STACK_LIMIT(ptr) (((ptr) - 1) & ~(THREAD_SIZE - 1)) | ||
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#define UNW_REGISTER_INFO \ | ||
PTREGS_INFO(rax), \ | ||
PTREGS_INFO(rdx), \ | ||
PTREGS_INFO(rcx), \ | ||
PTREGS_INFO(rbx), \ | ||
PTREGS_INFO(rsi), \ | ||
PTREGS_INFO(rdi), \ | ||
PTREGS_INFO(rbp), \ | ||
PTREGS_INFO(rsp), \ | ||
PTREGS_INFO(r8), \ | ||
PTREGS_INFO(r9), \ | ||
PTREGS_INFO(r10), \ | ||
PTREGS_INFO(r11), \ | ||
PTREGS_INFO(r12), \ | ||
PTREGS_INFO(r13), \ | ||
PTREGS_INFO(r14), \ | ||
PTREGS_INFO(r15), \ | ||
PTREGS_INFO(rip) | ||
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static inline void arch_unw_init_frame_info(struct unwind_frame_info *info, | ||
/*const*/ struct pt_regs *regs) | ||
{ | ||
info->regs = *regs; | ||
} | ||
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static inline void arch_unw_init_blocked(struct unwind_frame_info *info) | ||
{ | ||
extern const char thread_return[]; | ||
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memset(&info->regs, 0, sizeof(info->regs)); | ||
info->regs.rip = (unsigned long)thread_return; | ||
info->regs.cs = __KERNEL_CS; | ||
__get_user(info->regs.rbp, (unsigned long *)info->task->thread.rsp); | ||
info->regs.rsp = info->task->thread.rsp; | ||
info->regs.ss = __KERNEL_DS; | ||
} | ||
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extern void arch_unwind_init_running(struct unwind_frame_info *, | ||
void (*callback)(struct unwind_frame_info *, | ||
void *arg), | ||
void *arg); | ||
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static inline int arch_unw_user_mode(const struct unwind_frame_info *info) | ||
{ | ||
#if 0 /* This can only work when selector register saves/restores | ||
are properly annotated (and tracked in UNW_REGISTER_INFO). */ | ||
return user_mode(&info->regs); | ||
#else | ||
return (long)info->regs.rip >= 0 | ||
|| (info->regs.rip >= VSYSCALL_START && info->regs.rip < VSYSCALL_END) | ||
|| (long)info->regs.rsp >= 0; | ||
#endif | ||
} | ||
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#else | ||
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#define UNW_PC(frame) ((void)(frame), 0) | ||
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static inline int arch_unw_user_mode(const void *info) | ||
{ | ||
return 0; | ||
} | ||
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#endif | ||
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#endif /* _ASM_X86_64_UNWIND_H */ |
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