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[PATCH] i386: reliable stack trace support (i386)

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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>
This commit is contained in:
Jan Beulich 2006-06-26 13:57:41 +02:00 • committed by Linus Torvalds
commit 176a2718f4
7 changed files with 179 additions and 13 deletions
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98
include/asm-i386/unwind.h Normal file
View file

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#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)&regs->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 void arch_unwind_init_running(struct unwind_frame_info *,
asmlinkage void (*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_VSYSCALL)
&& info->regs.eip < __fix_to_virt(FIX_VSYSCALL) + 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 */