2010-05-28 23:09:12 -04:00
|
|
|
/*
|
|
|
|
|
* Copyright 2010 Tilera Corporation. All Rights Reserved.
|
|
|
|
|
*
|
|
|
|
|
* This program is free software; you can redistribute it and/or
|
|
|
|
|
* modify it under the terms of the GNU General Public License
|
|
|
|
|
* as published by the Free Software Foundation, version 2.
|
|
|
|
|
*
|
|
|
|
|
* This program is distributed in the hope that it will be useful, but
|
|
|
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
|
|
|
|
* NON INFRINGEMENT. See the GNU General Public License for
|
|
|
|
|
* more details.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#ifndef _ASM_TILE_STACK_H
|
|
|
|
|
#define _ASM_TILE_STACK_H
|
|
|
|
|
|
|
|
|
|
#include <linux/types.h>
|
|
|
|
|
#include <linux/sched.h>
|
|
|
|
|
#include <asm/backtrace.h>
|
2011-02-28 16:37:34 -05:00
|
|
|
#include <asm/page.h>
|
2010-05-28 23:09:12 -04:00
|
|
|
#include <hv/hypervisor.h>
|
|
|
|
|
|
|
|
|
|
/* Everything we need to keep track of a backtrace iteration */
|
|
|
|
|
struct KBacktraceIterator {
|
|
|
|
|
BacktraceIterator it;
|
|
|
|
|
struct task_struct *task; /* task we are backtracing */
|
|
|
|
|
int end; /* iteration complete. */
|
|
|
|
|
int new_context; /* new context is starting */
|
|
|
|
|
int profile; /* profiling, so stop on async intrpt */
|
|
|
|
|
int verbose; /* printk extra info (don't want to
|
|
|
|
|
* do this for profiling) */
|
|
|
|
|
int is_current; /* backtracing current task */
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
/* Iteration methods for kernel backtraces */
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Initialize a KBacktraceIterator from a task_struct, and optionally from
|
|
|
|
|
* a set of registers. If the registers are omitted, the process is
|
|
|
|
|
* assumed to be descheduled, and registers are read from the process's
|
|
|
|
|
* thread_struct and stack. "verbose" means to printk some additional
|
|
|
|
|
* information about fault handlers as we pass them on the stack.
|
|
|
|
|
*/
|
|
|
|
|
extern void KBacktraceIterator_init(struct KBacktraceIterator *kbt,
|
|
|
|
|
struct task_struct *, struct pt_regs *);
|
|
|
|
|
|
|
|
|
|
/* Initialize iterator based on current stack. */
|
|
|
|
|
extern void KBacktraceIterator_init_current(struct KBacktraceIterator *kbt);
|
|
|
|
|
|
2010-06-25 17:04:17 -04:00
|
|
|
/* Helper method for above. */
|
|
|
|
|
extern void _KBacktraceIterator_init_current(struct KBacktraceIterator *kbt,
|
|
|
|
|
ulong pc, ulong lr, ulong sp, ulong r52);
|
|
|
|
|
|
2010-05-28 23:09:12 -04:00
|
|
|
/* No more frames? */
|
|
|
|
|
extern int KBacktraceIterator_end(struct KBacktraceIterator *kbt);
|
|
|
|
|
|
|
|
|
|
/* Advance to the next frame. */
|
|
|
|
|
extern void KBacktraceIterator_next(struct KBacktraceIterator *kbt);
|
|
|
|
|
|
tile: improve stack backtrace
This commit fixes a number of issues with the tile backtrace code.
- Don't try to identify userspace shared object or executable paths
if we are doing a backtrace from an interrupt; it's not legal,
and also unlikely to be interesting. Likewise, don't try to do
it for other address spaces, since d_path() assumes it is being
called in "current" context.
- Move "in_backtrace" from thread_struct to thread_info.
This way we can access it even if our stack thread_info has been
clobbered, which makes backtracing more robust.
- Avoid using "current" directly when testing for is_sigreturn().
Since "current" may be corrupt, we're better off using kbt->task
explicitly to look up the vdso_base for the current task.
Conveniently, this simplifies the internal APIs (we only need
one is_sigreturn() function now).
- Avoid bogus "Odd fault" warning when pc/sp/ex1 are all zero,
as is true for kernel threads above the last frame.
- Hook into Tejun Heo's dump_stack() framework in lib/dump_stack.c.
- Write last entry in save_stack_trace() as ULONG_MAX, not zero,
since ftrace (at least) relies on finding that marker.
- Implement save_stack_trace_regs() and save_strack_trace_user(),
and set CONFIG_USER_STACKTRACE_SUPPORT.
Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
2015-05-08 10:27:35 -04:00
|
|
|
/* Dump just the contents of the pt_regs structure. */
|
|
|
|
|
extern void tile_show_regs(struct pt_regs *);
|
|
|
|
|
|
2010-05-28 23:09:12 -04:00
|
|
|
/*
|
|
|
|
|
* Dump stack given complete register info. Use only from the
|
|
|
|
|
* architecture-specific code; show_stack()
|
tile: improve stack backtrace
This commit fixes a number of issues with the tile backtrace code.
- Don't try to identify userspace shared object or executable paths
if we are doing a backtrace from an interrupt; it's not legal,
and also unlikely to be interesting. Likewise, don't try to do
it for other address spaces, since d_path() assumes it is being
called in "current" context.
- Move "in_backtrace" from thread_struct to thread_info.
This way we can access it even if our stack thread_info has been
clobbered, which makes backtracing more robust.
- Avoid using "current" directly when testing for is_sigreturn().
Since "current" may be corrupt, we're better off using kbt->task
explicitly to look up the vdso_base for the current task.
Conveniently, this simplifies the internal APIs (we only need
one is_sigreturn() function now).
- Avoid bogus "Odd fault" warning when pc/sp/ex1 are all zero,
as is true for kernel threads above the last frame.
- Hook into Tejun Heo's dump_stack() framework in lib/dump_stack.c.
- Write last entry in save_stack_trace() as ULONG_MAX, not zero,
since ftrace (at least) relies on finding that marker.
- Implement save_stack_trace_regs() and save_strack_trace_user(),
and set CONFIG_USER_STACKTRACE_SUPPORT.
Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
2015-05-08 10:27:35 -04:00
|
|
|
* and dump_stack() are architecture-independent entry points.
|
2010-05-28 23:09:12 -04:00
|
|
|
*/
|
tile: improve stack backtrace
This commit fixes a number of issues with the tile backtrace code.
- Don't try to identify userspace shared object or executable paths
if we are doing a backtrace from an interrupt; it's not legal,
and also unlikely to be interesting. Likewise, don't try to do
it for other address spaces, since d_path() assumes it is being
called in "current" context.
- Move "in_backtrace" from thread_struct to thread_info.
This way we can access it even if our stack thread_info has been
clobbered, which makes backtracing more robust.
- Avoid using "current" directly when testing for is_sigreturn().
Since "current" may be corrupt, we're better off using kbt->task
explicitly to look up the vdso_base for the current task.
Conveniently, this simplifies the internal APIs (we only need
one is_sigreturn() function now).
- Avoid bogus "Odd fault" warning when pc/sp/ex1 are all zero,
as is true for kernel threads above the last frame.
- Hook into Tejun Heo's dump_stack() framework in lib/dump_stack.c.
- Write last entry in save_stack_trace() as ULONG_MAX, not zero,
since ftrace (at least) relies on finding that marker.
- Implement save_stack_trace_regs() and save_strack_trace_user(),
and set CONFIG_USER_STACKTRACE_SUPPORT.
Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
2015-05-08 10:27:35 -04:00
|
|
|
extern void tile_show_stack(struct KBacktraceIterator *);
|
2010-05-28 23:09:12 -04:00
|
|
|
|
|
|
|
|
#endif /* _ASM_TILE_STACK_H */
|