1 #ifndef _ASM_X86_64_UNWIND_H
2 #define _ASM_X86_64_UNWIND_H
5 * Copyright (C) 2002-2006 Novell, Inc.
6 * Jan Beulich <jbeulich@novell.com>
7 * This code is released under version 2 of the GNU GPL.
10 #ifdef CONFIG_STACK_UNWIND
12 #include <linux/sched.h>
13 #include <asm/ptrace.h>
14 #include <asm/uaccess.h>
15 #include <asm/vsyscall.h>
17 struct unwind_frame_info
20 struct task_struct *task;
21 unsigned call_frame:1;
24 #define UNW_PC(frame) (frame)->regs.rip
25 #define UNW_SP(frame) (frame)->regs.rsp
26 #ifdef CONFIG_FRAME_POINTER
27 #define UNW_FP(frame) (frame)->regs.rbp
28 #define FRAME_RETADDR_OFFSET 8
29 #define FRAME_LINK_OFFSET 0
30 #define STACK_BOTTOM(tsk) (((tsk)->thread.rsp0 - 1) & ~(THREAD_SIZE - 1))
31 #define STACK_TOP(tsk) ((tsk)->thread.rsp0)
33 /* Might need to account for the special exception and interrupt handling
34 stacks here, since normally
35 EXCEPTION_STACK_ORDER < THREAD_ORDER < IRQSTACK_ORDER,
36 but the construct is needed only for getting across the stack switch to
37 the interrupt stack - thus considering the IRQ stack itself is unnecessary,
38 and the overhead of comparing against all exception handling stacks seems
40 #define STACK_LIMIT(ptr) (((ptr) - 1) & ~(THREAD_SIZE - 1))
42 #define UNW_REGISTER_INFO \
61 #define UNW_DEFAULT_RA(raItem, dataAlign) \
62 ((raItem).where == Memory && \
63 !((raItem).value * (dataAlign) + 8))
65 static inline void arch_unw_init_frame_info(struct unwind_frame_info *info,
66 /*const*/ struct pt_regs *regs)
71 static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
73 extern const char thread_return[];
75 memset(&info->regs, 0, sizeof(info->regs));
76 info->regs.rip = (unsigned long)thread_return;
77 info->regs.cs = __KERNEL_CS;
78 __get_user(info->regs.rbp, (unsigned long *)info->task->thread.rsp);
79 info->regs.rsp = info->task->thread.rsp;
80 info->regs.ss = __KERNEL_DS;
83 extern int arch_unwind_init_running(struct unwind_frame_info *,
84 int (*callback)(struct unwind_frame_info *,
88 static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
90 return user_mode(&info->regs)
91 || (long)info->regs.rip >= 0
92 || (info->regs.rip >= VSYSCALL_START && info->regs.rip < VSYSCALL_END)
93 || (long)info->regs.rsp >= 0;
98 #define UNW_PC(frame) ((void)(frame), 0UL)
99 #define UNW_SP(frame) ((void)(frame), 0UL)
101 static inline int arch_unw_user_mode(const void *info)
108 #endif /* _ASM_X86_64_UNWIND_H */