unwind.h
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#ifndef _ASM_X86_64_UNWIND_H
#define _ASM_X86_64_UNWIND_H
/*
* Copyright (C) 2002-2006 Novell, Inc.
* Jan Beulich <jbeulich@novell.com>
* This code is released under version 2 of the GNU GPL.
*/
#ifdef CONFIG_STACK_UNWIND
#include <linux/sched.h>
#include <asm/ptrace.h>
#include <asm/uaccess.h>
#include <asm/vsyscall.h>
struct unwind_frame_info
{
struct pt_regs regs;
struct task_struct *task;
};
#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))
#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)
static inline void arch_unw_init_frame_info(struct unwind_frame_info *info,
/*const*/ struct pt_regs *regs)
{
info->regs = *regs;
}
static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
{
extern const char thread_return[];
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;
}
extern int arch_unwind_init_running(struct unwind_frame_info *,
int (*callback)(struct unwind_frame_info *,
void *arg),
void *arg);
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
}
#else
#define UNW_PC(frame) ((void)(frame), 0)
static inline int arch_unw_user_mode(const void *info)
{
return 0;
}
#endif
#endif /* _ASM_X86_64_UNWIND_H */