#ifndef _ASM_I386_UNWIND_H #define _ASM_I386_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/fixmap.h> #include <asm/ptrace.h> #include <asm/uaccess.h> struct unwind_frame_info { struct pt_regs regs; struct task_struct *task; }; #define UNW_PC(frame) (frame)->regs.eip #define UNW_SP(frame) (frame)->regs.esp #ifdef CONFIG_FRAME_POINTER #define UNW_FP(frame) (frame)->regs.ebp #define FRAME_RETADDR_OFFSET 4 #define FRAME_LINK_OFFSET 0 #define STACK_BOTTOM(tsk) STACK_LIMIT((tsk)->thread.esp0) #define STACK_TOP(tsk) ((tsk)->thread.esp0) #endif #define STACK_LIMIT(ptr) (((ptr) - 1) & ~(THREAD_SIZE - 1)) #define UNW_REGISTER_INFO \ PTREGS_INFO(eax), \ PTREGS_INFO(ecx), \ PTREGS_INFO(edx), \ PTREGS_INFO(ebx), \ PTREGS_INFO(esp), \ PTREGS_INFO(ebp), \ PTREGS_INFO(esi), \ PTREGS_INFO(edi), \ PTREGS_INFO(eip) static inline void arch_unw_init_frame_info(struct unwind_frame_info *info, /*const*/ struct pt_regs *regs) { if (user_mode_vm(regs)) info->regs = *regs; else { memcpy(&info->regs, regs, offsetof(struct pt_regs, esp)); info->regs.esp = (unsigned long)®s->esp; info->regs.xss = __KERNEL_DS; } } static inline void arch_unw_init_blocked(struct unwind_frame_info *info) { memset(&info->regs, 0, sizeof(info->regs)); info->regs.eip = info->task->thread.eip; info->regs.xcs = __KERNEL_CS; __get_user(info->regs.ebp, (long *)info->task->thread.esp); info->regs.esp = info->task->thread.esp; info->regs.xss = __KERNEL_DS; info->regs.xds = __USER_DS; info->regs.xes = __USER_DS; } extern asmlinkage int arch_unwind_init_running(struct unwind_frame_info *, asmlinkage 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 and EFLAGS saves/restores are properly annotated (and tracked in UNW_REGISTER_INFO). */ return user_mode_vm(&info->regs); #else return info->regs.eip < PAGE_OFFSET || (info->regs.eip >= __fix_to_virt(FIX_VDSO) && info->regs.eip < __fix_to_virt(FIX_VDSO) + PAGE_SIZE) || info->regs.esp < PAGE_OFFSET; #endif } #else #define UNW_PC(frame) ((void)(frame), 0) static inline int arch_unw_user_mode(const void *info) { return 0; } #endif #endif /* _ASM_I386_UNWIND_H */