mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 12:43:55 +08:00
2c96b2fe9c
In the following commit:
0100301bfd
("sched/x86: Rewrite the switch_to() code")
... the layout of the 'inactive_task_frame' struct was designed to have
a frame pointer header embedded in it, so that the unwinder could use
the 'bp' and 'ret_addr' fields to report __schedule() on the stack (or
ret_from_fork() for newly forked tasks which haven't actually run yet).
Finish the job by changing get_frame_pointer() to return a pointer to
inactive_task_frame's 'bp' field rather than 'bp' itself. This allows
the unwinder to start one frame higher on the stack, so that it properly
reports __schedule().
Reported-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Jones <davej@codemonkey.org.uk>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/598e9f7505ed0aba86e8b9590aa528c6c7ae8dcd.1483978430.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
113 lines
2.4 KiB
C
113 lines
2.4 KiB
C
/*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
* Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
|
|
*/
|
|
|
|
#ifndef _ASM_X86_STACKTRACE_H
|
|
#define _ASM_X86_STACKTRACE_H
|
|
|
|
#include <linux/uaccess.h>
|
|
#include <linux/ptrace.h>
|
|
#include <asm/switch_to.h>
|
|
|
|
enum stack_type {
|
|
STACK_TYPE_UNKNOWN,
|
|
STACK_TYPE_TASK,
|
|
STACK_TYPE_IRQ,
|
|
STACK_TYPE_SOFTIRQ,
|
|
STACK_TYPE_EXCEPTION,
|
|
STACK_TYPE_EXCEPTION_LAST = STACK_TYPE_EXCEPTION + N_EXCEPTION_STACKS-1,
|
|
};
|
|
|
|
struct stack_info {
|
|
enum stack_type type;
|
|
unsigned long *begin, *end, *next_sp;
|
|
};
|
|
|
|
bool in_task_stack(unsigned long *stack, struct task_struct *task,
|
|
struct stack_info *info);
|
|
|
|
int get_stack_info(unsigned long *stack, struct task_struct *task,
|
|
struct stack_info *info, unsigned long *visit_mask);
|
|
|
|
const char *stack_type_name(enum stack_type type);
|
|
|
|
static inline bool on_stack(struct stack_info *info, void *addr, size_t len)
|
|
{
|
|
void *begin = info->begin;
|
|
void *end = info->end;
|
|
|
|
return (info->type != STACK_TYPE_UNKNOWN &&
|
|
addr >= begin && addr < end &&
|
|
addr + len > begin && addr + len <= end);
|
|
}
|
|
|
|
#ifdef CONFIG_X86_32
|
|
#define STACKSLOTS_PER_LINE 8
|
|
#else
|
|
#define STACKSLOTS_PER_LINE 4
|
|
#endif
|
|
|
|
#ifdef CONFIG_FRAME_POINTER
|
|
static inline unsigned long *
|
|
get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
|
|
{
|
|
if (regs)
|
|
return (unsigned long *)regs->bp;
|
|
|
|
if (task == current)
|
|
return __builtin_frame_address(0);
|
|
|
|
return &((struct inactive_task_frame *)task->thread.sp)->bp;
|
|
}
|
|
#else
|
|
static inline unsigned long *
|
|
get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif /* CONFIG_FRAME_POINTER */
|
|
|
|
static inline unsigned long *
|
|
get_stack_pointer(struct task_struct *task, struct pt_regs *regs)
|
|
{
|
|
if (regs)
|
|
return (unsigned long *)kernel_stack_pointer(regs);
|
|
|
|
if (task == current)
|
|
return __builtin_frame_address(0);
|
|
|
|
return (unsigned long *)task->thread.sp;
|
|
}
|
|
|
|
void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
|
|
unsigned long *stack, char *log_lvl);
|
|
|
|
extern unsigned int code_bytes;
|
|
|
|
/* The form of the top of the frame on the stack */
|
|
struct stack_frame {
|
|
struct stack_frame *next_frame;
|
|
unsigned long return_address;
|
|
};
|
|
|
|
struct stack_frame_ia32 {
|
|
u32 next_frame;
|
|
u32 return_address;
|
|
};
|
|
|
|
static inline unsigned long caller_frame_pointer(void)
|
|
{
|
|
struct stack_frame *frame;
|
|
|
|
frame = __builtin_frame_address(0);
|
|
|
|
#ifdef CONFIG_FRAME_POINTER
|
|
frame = frame->next_frame;
|
|
#endif
|
|
|
|
return (unsigned long)frame;
|
|
}
|
|
|
|
#endif /* _ASM_X86_STACKTRACE_H */
|