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[PATCH] i386: reliable stack trace support (i386)
These are the i386-specific pieces to enable reliable stack traces. This is going to be even more useful once CFI annotations get added to he assembly code, namely to entry.S. Signed-off-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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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 |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| #ifndef _ASM_I386_UNWIND_H | ||
| #define _ASM_I386_UNWIND_H | ||
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| /* | ||
| * Copyright (C) 2002-2006 Novell, Inc. | ||
| * Jan Beulich <jbeulich@novell.com> | ||
| * 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/fixmap.h> | ||
| #include <asm/ptrace.h> | ||
| #include <asm/uaccess.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.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)) | ||
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| #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) | ||
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| 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; | ||
| } | ||
| } | ||
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| 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; | ||
| } | ||
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| extern asmlinkage void arch_unwind_init_running(struct unwind_frame_info *, | ||
| asmlinkage 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 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_VSYSCALL) | ||
| && info->regs.eip < __fix_to_virt(FIX_VSYSCALL) + PAGE_SIZE) | ||
| || info->regs.esp < PAGE_OFFSET; | ||
| #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_I386_UNWIND_H */ |
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