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   1 #ifndef _ASM_I386_UNWIND_H
   2 #define _ASM_I386_UNWIND_H
   3
   4 /*
   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.
   8  */
   9
  10 #ifdef CONFIG_STACK_UNWIND
  11
  12 #include <linux/sched.h>
  13 #include <asm/fixmap.h>
  14 #include <asm/ptrace.h>
  15 #include <asm/uaccess.h>
  16
  17 struct unwind_frame_info
  18 {
  19         struct pt_regs regs;
  20         struct task_struct *task;
  21         unsigned call_frame:1;
  22 };
  23
  24 #define UNW_PC(frame)        (frame)->regs.eip
  25 #define UNW_SP(frame)        (frame)->regs.esp
  26 #ifdef CONFIG_FRAME_POINTER
  27 #define UNW_FP(frame)        (frame)->regs.ebp
  28 #define FRAME_RETADDR_OFFSET 4
  29 #define FRAME_LINK_OFFSET    0
  30 #define STACK_BOTTOM(tsk)    STACK_LIMIT((tsk)->thread.esp0)
  31 #define STACK_TOP(tsk)       ((tsk)->thread.esp0)
  32 #else
  33 #define UNW_FP(frame) ((void)(frame), 0)
  34 #endif
  35 #define STACK_LIMIT(ptr)     (((ptr) - 1) & ~(THREAD_SIZE - 1))
  36
  37 #define UNW_REGISTER_INFO \
  38         PTREGS_INFO(eax), \
  39         PTREGS_INFO(ecx), \
  40         PTREGS_INFO(edx), \
  41         PTREGS_INFO(ebx), \
  42         PTREGS_INFO(esp), \
  43         PTREGS_INFO(ebp), \
  44         PTREGS_INFO(esi), \
  45         PTREGS_INFO(edi), \
  46         PTREGS_INFO(eip)
  47
  48 #define UNW_DEFAULT_RA(raItem, dataAlign) \
  49         ((raItem).where == Memory && \
  50          !((raItem).value * (dataAlign) + 4))
  51
  52 static inline void arch_unw_init_frame_info(struct unwind_frame_info *info,
  53                                             /*const*/ struct pt_regs *regs)
  54 {
  55         if (user_mode_vm(regs))
  56                 info->regs = *regs;
  57         else {
  58                 memcpy(&info->regs, regs, offsetof(struct pt_regs, esp));
  59                 info->regs.esp = (unsigned long)&regs->esp;
  60                 info->regs.xss = __KERNEL_DS;
  61         }
  62 }
  63
  64 static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
  65 {
  66         memset(&info->regs, 0, sizeof(info->regs));
  67         info->regs.eip = info->task->thread.eip;
  68         info->regs.xcs = __KERNEL_CS;
  69         __get_user(info->regs.ebp, (long *)info->task->thread.esp);
  70         info->regs.esp = info->task->thread.esp;
  71         info->regs.xss = __KERNEL_DS;
  72         info->regs.xds = __USER_DS;
  73         info->regs.xes = __USER_DS;
  74 }
  75
  76 extern asmlinkage int arch_unwind_init_running(struct unwind_frame_info *,
  77                                                asmlinkage int (*callback)(struct unwind_frame_info *,
  78                                                                           void *arg),
  79                                                void *arg);
  80
  81 static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
  82 {
  83 #if 0 /* This can only work when selector register and EFLAGS saves/restores
  84          are properly annotated (and tracked in UNW_REGISTER_INFO). */
  85         return user_mode_vm(&info->regs);
  86 #else
  87         return info->regs.eip < PAGE_OFFSET
  88                || (info->regs.eip >= __fix_to_virt(FIX_VDSO)
  89                     && info->regs.eip < __fix_to_virt(FIX_VDSO) + PAGE_SIZE)
  90                || info->regs.esp < PAGE_OFFSET;
  91 #endif
  92 }
  93
  94 #else
  95
  96 #define UNW_PC(frame) ((void)(frame), 0)
  97 #define UNW_SP(frame) ((void)(frame), 0)
  98 #define UNW_FP(frame) ((void)(frame), 0)
  99
 100 static inline int arch_unw_user_mode(const void *info)
 101 {
 102         return 0;
 103 }
 104
 105 #endif
 106
 107 #endif /* _ASM_I386_UNWIND_H */